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apache / httpd / refs/heads/wombat-integration / . / modules / mappers / mod_rewrite.c
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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* _ _ _
* _ __ ___ ___ __| | _ __ _____ ___ __(_) |_ ___
* | '_ ` _ \ / _ \ / _` | | '__/ _ \ \ /\ / / '__| | __/ _ \
* | | | | | | (_) | (_| | | | | __/\ V V /| | | | || __/
* |_| |_| |_|\___/ \__,_|___|_| \___| \_/\_/ |_| |_|\__\___|
* |_____|
*
* URL Rewriting Module
*
* This module uses a rule-based rewriting engine (based on a
* regular-expression parser) to rewrite requested URLs on the fly.
*
* It supports an unlimited number of additional rule conditions (which can
* operate on a lot of variables, even on HTTP headers) for granular
* matching and even external database lookups (either via plain text
* tables, DBM hash files or even external processes) for advanced URL
* substitution.
*
* It operates on the full URLs (including the PATH_INFO part) both in
* per-server context (httpd.conf) and per-dir context (.htaccess) and even
* can generate QUERY_STRING parts on result. The rewriting result finally
* can lead to internal subprocessing, external request redirection or even
* to internal proxy throughput.
*
* This module was originally written in April 1996 and
* gifted exclusively to the The Apache Software Foundation in July 1997 by
*
* Ralf S. Engelschall
* rse engelschall.com
* www.engelschall.com
*/
#include "apr.h"
#include "apr_strings.h"
#include "apr_hash.h"
#include "apr_user.h"
#include "apr_lib.h"
#include "apr_signal.h"
#include "apr_global_mutex.h"
#include "apr_dbm.h"
#include "apr_dbd.h"
#include "mod_dbd.h"
#if APR_HAS_THREADS
#include "apr_thread_mutex.h"
#endif
#define APR_WANT_MEMFUNC
#define APR_WANT_STRFUNC
#define APR_WANT_IOVEC
#include "apr_want.h"
/* XXX: Do we really need these headers? */
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_STDARG_H
#include <stdarg.h>
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_CTYPE_H
#include <ctype.h>
#endif
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_vhost.h"
#include "mod_ssl.h"
#include "mod_rewrite.h"
#ifdef AP_NEED_SET_MUTEX_PERMS
#include "unixd.h"
#endif
static ap_dbd_t *(*dbd_acquire)(request_rec*) = NULL;
static void (*dbd_prepare)(server_rec*, const char*, const char*) = NULL;
/*
* in order to improve performance on running production systems, you
* may strip all rewritelog code entirely from mod_rewrite by using the
* -DREWRITELOG_DISABLED compiler option.
*
* DO NOT USE THIS OPTION FOR PUBLIC BINARY RELEASES. Otherwise YOU are
* responsible for answering all the mod_rewrite questions out there.
*/
#ifndef REWRITELOG_DISABLED
#define rewritelog(x) do_rewritelog x
#define REWRITELOG_MODE ( APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD )
#define REWRITELOG_FLAGS ( APR_WRITE | APR_APPEND | APR_CREATE )
#else /* !REWRITELOG_DISABLED */
#define rewritelog(x)
#endif /* REWRITELOG_DISABLED */
/* remembered mime-type for [T=...] */
#define REWRITE_FORCED_MIMETYPE_NOTEVAR "rewrite-forced-mimetype"
#define REWRITE_FORCED_HANDLER_NOTEVAR "rewrite-forced-handler"
#define ENVVAR_SCRIPT_URL "SCRIPT_URL"
#define REDIRECT_ENVVAR_SCRIPT_URL "REDIRECT_" ENVVAR_SCRIPT_URL
#define ENVVAR_SCRIPT_URI "SCRIPT_URI"
#define CONDFLAG_NONE 1<<0
#define CONDFLAG_NOCASE 1<<1
#define CONDFLAG_NOTMATCH 1<<2
#define CONDFLAG_ORNEXT 1<<3
#define CONDFLAG_NOVARY 1<<4
#define RULEFLAG_NONE 1<<0
#define RULEFLAG_FORCEREDIRECT 1<<1
#define RULEFLAG_LASTRULE 1<<2
#define RULEFLAG_NEWROUND 1<<3
#define RULEFLAG_CHAIN 1<<4
#define RULEFLAG_IGNOREONSUBREQ 1<<5
#define RULEFLAG_NOTMATCH 1<<6
#define RULEFLAG_PROXY 1<<7
#define RULEFLAG_PASSTHROUGH 1<<8
#define RULEFLAG_QSAPPEND 1<<9
#define RULEFLAG_NOCASE 1<<10
#define RULEFLAG_NOESCAPE 1<<11
#define RULEFLAG_NOSUB 1<<12
#define RULEFLAG_STATUS 1<<13
#define RULEFLAG_ESCAPEBACKREF 1<<14
/* return code of the rewrite rule
* the result may be escaped - or not
*/
#define ACTION_NORMAL 1<<0
#define ACTION_NOESCAPE 1<<1
#define ACTION_STATUS 1<<2
#define MAPTYPE_TXT 1<<0
#define MAPTYPE_DBM 1<<1
#define MAPTYPE_PRG 1<<2
#define MAPTYPE_INT 1<<3
#define MAPTYPE_RND 1<<4
#define MAPTYPE_DBD 1<<5
#define MAPTYPE_DBD_CACHE 1<<6
#define ENGINE_DISABLED 1<<0
#define ENGINE_ENABLED 1<<1
#define OPTION_NONE 1<<0
#define OPTION_INHERIT 1<<1
#ifndef RAND_MAX
#define RAND_MAX 32767
#endif
/* max cookie size in rfc 2109 */
/* XXX: not used at all. We should do a check somewhere and/or cut the cookie */
#define MAX_COOKIE_LEN 4096
/* max line length (incl.\n) in text rewrite maps */
#ifndef REWRITE_MAX_TXT_MAP_LINE
#define REWRITE_MAX_TXT_MAP_LINE 1024
#endif
/* buffer length for prg rewrite maps */
#ifndef REWRITE_PRG_MAP_BUF
#define REWRITE_PRG_MAP_BUF 1024
#endif
/* for better readbility */
#define LEFT_CURLY '{'
#define RIGHT_CURLY '}'
/*
* expansion result items on the stack to save some cycles
*
* (5 == about 2 variables like "foo%{var}bar%{var}baz")
*/
#define SMALL_EXPANSION 5
/*
* check that a subrequest won't cause infinite recursion
*
* either not in a subrequest, or in a subrequest
* and URIs aren't NULL and sub/main URIs differ
*/
#define subreq_ok(r) (!r->main || \
(r->main->uri && r->uri && strcmp(r->main->uri, r->uri)))
/*
* +-------------------------------------------------------+
* | |
* | Types and Structures
* | |
* +-------------------------------------------------------+
*/
typedef struct {
const char *datafile; /* filename for map data files */
const char *dbmtype; /* dbm type for dbm map data files */
const char *checkfile; /* filename to check for map existence */
const char *cachename; /* for cached maps (txt/rnd/dbm) */
int type; /* the type of the map */
apr_file_t *fpin; /* in file pointer for program maps */
apr_file_t *fpout; /* out file pointer for program maps */
apr_file_t *fperr; /* err file pointer for program maps */
char *(*func)(request_rec *, /* function pointer for internal maps */
char *);
char **argv; /* argv of the external rewrite map */
const char *dbdq; /* SQL SELECT statement for rewritemap */
const char *checkfile2; /* filename to check for map existence
NULL if only one file */
} rewritemap_entry;
/* special pattern types for RewriteCond */
typedef enum {
CONDPAT_REGEX = 0,
CONDPAT_FILE_EXISTS,
CONDPAT_FILE_SIZE,
CONDPAT_FILE_LINK,
CONDPAT_FILE_DIR,
CONDPAT_FILE_XBIT,
CONDPAT_LU_URL,
CONDPAT_LU_FILE,
CONDPAT_STR_GT,
CONDPAT_STR_LT,
CONDPAT_STR_EQ
} pattern_type;
typedef struct {
char *input; /* Input string of RewriteCond */
char *pattern; /* the RegExp pattern string */
ap_regex_t *regexp; /* the precompiled regexp */
int flags; /* Flags which control the match */
pattern_type ptype; /* pattern type */
} rewritecond_entry;
/* single linked list for env vars and cookies */
typedef struct data_item {
struct data_item *next;
char *data;
} data_item;
typedef struct {
apr_array_header_t *rewriteconds;/* the corresponding RewriteCond entries */
char *pattern; /* the RegExp pattern string */
ap_regex_t *regexp; /* the RegExp pattern compilation */
char *output; /* the Substitution string */
int flags; /* Flags which control the substitution */
char *forced_mimetype; /* forced MIME type of substitution */
char *forced_handler; /* forced content handler of subst. */
int forced_responsecode; /* forced HTTP response status */
data_item *env; /* added environment variables */
data_item *cookie; /* added cookies */
int skip; /* number of next rules to skip */
} rewriterule_entry;
typedef struct {
int state; /* the RewriteEngine state */
int options; /* the RewriteOption state */
#ifndef REWRITELOG_DISABLED
const char *rewritelogfile; /* the RewriteLog filename */
apr_file_t *rewritelogfp; /* the RewriteLog open filepointer */
int rewriteloglevel; /* the RewriteLog level of verbosity */
#endif
apr_hash_t *rewritemaps; /* the RewriteMap entries */
apr_array_header_t *rewriteconds; /* the RewriteCond entries (temp.) */
apr_array_header_t *rewriterules; /* the RewriteRule entries */
server_rec *server; /* the corresponding server indicator */
} rewrite_server_conf;
typedef struct {
int state; /* the RewriteEngine state */
int options; /* the RewriteOption state */
apr_array_header_t *rewriteconds; /* the RewriteCond entries (temp.) */
apr_array_header_t *rewriterules; /* the RewriteRule entries */
char *directory; /* the directory where it applies */
const char *baseurl; /* the base-URL where it applies */
} rewrite_perdir_conf;
/* the (per-child) cache structures.
*/
typedef struct cache {
apr_pool_t *pool;
apr_hash_t *maps;
#if APR_HAS_THREADS
apr_thread_mutex_t *lock;
#endif
} cache;
/* cached maps contain an mtime for the whole map and live in a subpool
* of the cachep->pool. That makes it easy to forget them if necessary.
*/
typedef struct {
apr_time_t mtime;
apr_pool_t *pool;
apr_hash_t *entries;
} cachedmap;
/* the regex structure for the
* substitution of backreferences
*/
typedef struct backrefinfo {
char *source;
int nsub;
ap_regmatch_t regmatch[AP_MAX_REG_MATCH];
} backrefinfo;
/* single linked list used for
* variable expansion
*/
typedef struct result_list {
struct result_list *next;
apr_size_t len;
const char *string;
} result_list;
/* context structure for variable lookup and expansion
*/
typedef struct {
request_rec *r;
const char *uri;
const char *vary_this;
const char *vary;
char *perdir;
backrefinfo briRR;
backrefinfo briRC;
} rewrite_ctx;
/*
* +-------------------------------------------------------+
* | |
* | static module data
* | |
* +-------------------------------------------------------+
*/
/* the global module structure */
module AP_MODULE_DECLARE_DATA rewrite_module;
/* rewritemap int: handler function registry */
static apr_hash_t *mapfunc_hash;
/* the cache */
static cache *cachep;
/* whether proxy module is available or not */
static int proxy_available;
/* whether random seed can be reaped */
static int rewrite_rand_init_done = 0;
/* Locks/Mutexes */
static const char *lockname;
static apr_global_mutex_t *rewrite_mapr_lock_acquire = NULL;
#ifndef REWRITELOG_DISABLED
static apr_global_mutex_t *rewrite_log_lock = NULL;
#endif
/* Optional functions imported from mod_ssl when loaded: */
static APR_OPTIONAL_FN_TYPE(ssl_var_lookup) *rewrite_ssl_lookup = NULL;
static APR_OPTIONAL_FN_TYPE(ssl_is_https) *rewrite_is_https = NULL;
/*
* +-------------------------------------------------------+
* | |
* | rewriting logfile support
* | |
* +-------------------------------------------------------+
*/
#ifndef REWRITELOG_DISABLED
static char *current_logtime(request_rec *r)
{
apr_time_exp_t t;
char tstr[80];
apr_size_t len;
apr_time_exp_lt(&t, apr_time_now());
apr_strftime(tstr, &len, sizeof(tstr), "[%d/%b/%Y:%H:%M:%S ", &t);
apr_snprintf(tstr+len, sizeof(tstr)-len, "%c%.2d%.2d]",
t.tm_gmtoff < 0 ? '-' : '+',
t.tm_gmtoff / (60*60), t.tm_gmtoff % (60*60));
return apr_pstrdup(r->pool, tstr);
}
static int open_rewritelog(server_rec *s, apr_pool_t *p)
{
rewrite_server_conf *conf;
const char *fname;
conf = ap_get_module_config(s->module_config, &rewrite_module);
/* - no logfile configured
* - logfilename empty
* - virtual log shared w/ main server
*/
if (!conf->rewritelogfile || !*conf->rewritelogfile || conf->rewritelogfp) {
return 1;
}
if (*conf->rewritelogfile == '|') {
piped_log *pl;
fname = ap_server_root_relative(p, conf->rewritelogfile+1);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_ERR, APR_EBADPATH, s,
"mod_rewrite: Invalid RewriteLog "
"path %s", conf->rewritelogfile+1);
return 0;
}
if ((pl = ap_open_piped_log(p, fname)) == NULL) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
"mod_rewrite: could not open reliable pipe "
"to RewriteLog filter %s", fname);
return 0;
}
conf->rewritelogfp = ap_piped_log_write_fd(pl);
}
else {
apr_status_t rc;
fname = ap_server_root_relative(p, conf->rewritelogfile);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_ERR, APR_EBADPATH, s,
"mod_rewrite: Invalid RewriteLog "
"path %s", conf->rewritelogfile);
return 0;
}
if ((rc = apr_file_open(&conf->rewritelogfp, fname,
REWRITELOG_FLAGS, REWRITELOG_MODE, p))
!= APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rc, s,
"mod_rewrite: could not open RewriteLog "
"file %s", fname);
return 0;
}
}
return 1;
}
static void do_rewritelog(request_rec *r, int level, char *perdir,
const char *fmt, ...)
__attribute__((format(printf,4,5)));
static void do_rewritelog(request_rec *r, int level, char *perdir,
const char *fmt, ...)
{
rewrite_server_conf *conf;
char *logline, *text;
const char *rhost, *rname;
apr_size_t nbytes;
int redir;
apr_status_t rv;
request_rec *req;
va_list ap;
conf = ap_get_module_config(r->server->module_config, &rewrite_module);
if ((!conf->rewritelogfp || level > conf->rewriteloglevel) &&
!AP_REWRITE_LOG_ENABLED()) {
return;
}
rhost = ap_get_remote_host(r->connection, r->per_dir_config,
REMOTE_NOLOOKUP, NULL);
rname = ap_get_remote_logname(r);
for (redir=0, req=r; req->prev; req = req->prev) {
++redir;
}
va_start(ap, fmt);
text = apr_pvsprintf(r->pool, fmt, ap);
va_end(ap);
logline = apr_psprintf(r->pool, "%s %s %s %s [%s/sid#%pp][rid#%pp/%s%s%s] "
"(%d) %s%s%s%s" APR_EOL_STR,
rhost ? rhost : "UNKNOWN-HOST",
rname ? rname : "-",
r->user ? (*r->user ? r->user : "\"\"") : "-",
current_logtime(r),
ap_get_server_name(r),
(void *)(r->server),
(void *)r,
r->main ? "subreq" : "initial",
redir ? "/redir#" : "",
redir ? apr_itoa(r->pool, redir) : "",
level,
perdir ? "[perdir " : "",
perdir ? perdir : "",
perdir ? "] ": "",
text);
AP_REWRITE_LOG((uintptr_t)r, level, r->main ? 0 : 1, (char *)ap_get_server_name(r), logline);
if (!conf->rewritelogfp || level > conf->rewriteloglevel)
return;
rv = apr_global_mutex_lock(rewrite_log_lock);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"apr_global_mutex_lock(rewrite_log_lock) failed");
/* XXX: Maybe this should be fatal? */
}
nbytes = strlen(logline);
apr_file_write(conf->rewritelogfp, logline, &nbytes);
rv = apr_global_mutex_unlock(rewrite_log_lock);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"apr_global_mutex_unlock(rewrite_log_lock) failed");
/* XXX: Maybe this should be fatal? */
}
return;
}
#endif /* !REWRITELOG_DISABLED */
/*
* +-------------------------------------------------------+
* | |
* | URI and path functions
* | |
* +-------------------------------------------------------+
*/
/* return number of chars of the scheme (incl. '://')
* if the URI is absolute (includes a scheme etc.)
* otherwise 0.
*
* NOTE: If you add new schemes here, please have a
* look at escape_absolute_uri and splitout_queryargs.
* Not every scheme takes query strings and some schemes
* may be handled in a special way.
*
* XXX: we may consider a scheme registry, perhaps with
* appropriate escape callbacks to allow other modules
* to extend mod_rewrite at runtime.
*/
static unsigned is_absolute_uri(char *uri)
{
/* fast exit */
if (*uri == '/' || strlen(uri) <= 5) {
return 0;
}
switch (*uri++) {
case 'a':
case 'A':
if (!strncasecmp(uri, "jp://", 5)) { /* ajp:// */
return 6;
}
break;
case 'b':
case 'B':
if (!strncasecmp(uri, "alancer://", 10)) { /* balancer:// */
return 11;
}
break;
case 'f':
case 'F':
if (!strncasecmp(uri, "tp://", 5)) { /* ftp:// */
return 6;
}
if (!strncasecmp(uri, "cgi://", 6)) { /* fcgi:// */
return 7;
}
break;
case 'g':
case 'G':
if (!strncasecmp(uri, "opher://", 8)) { /* gopher:// */
return 9;
}
break;
case 'h':
case 'H':
if (!strncasecmp(uri, "ttp://", 6)) { /* http:// */
return 7;
}
else if (!strncasecmp(uri, "ttps://", 7)) { /* https:// */
return 8;
}
break;
case 'l':
case 'L':
if (!strncasecmp(uri, "dap://", 6)) { /* ldap:// */
return 7;
}
break;
case 'm':
case 'M':
if (!strncasecmp(uri, "ailto:", 6)) { /* mailto: */
return 7;
}
break;
case 'n':
case 'N':
if (!strncasecmp(uri, "ews:", 4)) { /* news: */
return 5;
}
else if (!strncasecmp(uri, "ntp://", 6)) { /* nntp:// */
return 7;
}
break;
}
return 0;
}
/*
* escape absolute uri, which may or may not be path oriented.
* So let's handle them differently.
*/
static char *escape_absolute_uri(apr_pool_t *p, char *uri, unsigned scheme)
{
char *cp;
/* be safe.
* NULL should indicate elsewhere, that something's wrong
*/
if (!scheme || strlen(uri) < scheme) {
return NULL;
}
cp = uri + scheme;
/* scheme with authority part? */
if (cp[-1] == '/') {
/* skip host part */
while (*cp && *cp != '/') {
++cp;
}
/* nothing after the hostpart. ready! */
if (!*cp || !*++cp) {
return apr_pstrdup(p, uri);
}
/* remember the hostname stuff */
scheme = cp - uri;
/* special thing for ldap.
* The parts are separated by question marks. From RFC 2255:
* ldapurl = scheme "://" [hostport] ["/"
* [dn ["?" [attributes] ["?" [scope]
* ["?" [filter] ["?" extensions]]]]]]
*/
if (!strncasecmp(uri, "ldap", 4)) {
char *token[5];
int c = 0;
token[0] = cp = apr_pstrdup(p, cp);
while (*cp && c < 4) {
if (*cp == '?') {
token[++c] = cp + 1;
*cp = '\0';
}
++cp;
}
return apr_pstrcat(p, apr_pstrndup(p, uri, scheme),
ap_escape_uri(p, token[0]),
(c >= 1) ? "?" : NULL,
(c >= 1) ? ap_escape_uri(p, token[1]) : NULL,
(c >= 2) ? "?" : NULL,
(c >= 2) ? ap_escape_uri(p, token[2]) : NULL,
(c >= 3) ? "?" : NULL,
(c >= 3) ? ap_escape_uri(p, token[3]) : NULL,
(c >= 4) ? "?" : NULL,
(c >= 4) ? ap_escape_uri(p, token[4]) : NULL,
NULL);
}
}
/* Nothing special here. Apply normal escaping. */
return apr_pstrcat(p, apr_pstrndup(p, uri, scheme),
ap_escape_uri(p, cp), NULL);
}
/*
* split out a QUERY_STRING part from
* the current URI string
*/
static void splitout_queryargs(request_rec *r, int qsappend)
{
char *q;
/* don't touch, unless it's an http or mailto URL.
* See RFC 1738 and RFC 2368.
*/
if (is_absolute_uri(r->filename)
&& strncasecmp(r->filename, "ajp", 3)
&& strncasecmp(r->filename, "balancer", 8)
&& strncasecmp(r->filename, "http", 4)
&& strncasecmp(r->filename, "mailto", 6)) {
r->args = NULL; /* forget the query that's still flying around */
return;
}
q = ap_strchr(r->filename, '?');
if (q != NULL) {
char *olduri;
apr_size_t len;
olduri = apr_pstrdup(r->pool, r->filename);
*q++ = '\0';
if (qsappend) {
r->args = apr_pstrcat(r->pool, q, "&", r->args, NULL);
}
else {
r->args = apr_pstrdup(r->pool, q);
}
len = strlen(r->args);
if (!len) {
r->args = NULL;
}
else if (r->args[len-1] == '&') {
r->args[len-1] = '\0';
}
rewritelog((r, 3, NULL, "split uri=%s -> uri=%s, args=%s", olduri,
r->filename, r->args ? r->args : "<none>"));
}
return;
}
/*
* strip 'http[s]://ourhost/' from URI
*/
static void reduce_uri(request_rec *r)
{
char *cp;
apr_size_t l;
cp = (char *)ap_http_scheme(r);
l = strlen(cp);
if ( strlen(r->filename) > l+3
&& strncasecmp(r->filename, cp, l) == 0
&& r->filename[l] == ':'
&& r->filename[l+1] == '/'
&& r->filename[l+2] == '/' ) {
unsigned short port;
char *portp, *host, *url, *scratch;
scratch = apr_pstrdup(r->pool, r->filename); /* our scratchpad */
/* cut the hostname and port out of the URI */
cp = host = scratch + l + 3; /* 3 == strlen("://") */
while (*cp && *cp != '/' && *cp != ':') {
++cp;
}
if (*cp == ':') { /* additional port given */
*cp++ = '\0';
portp = cp;
while (*cp && *cp != '/') {
++cp;
}
*cp = '\0';
port = atoi(portp);
url = r->filename + (cp - scratch);
if (!*url) {
url = "/";
}
}
else if (*cp == '/') { /* default port */
*cp = '\0';
port = ap_default_port(r);
url = r->filename + (cp - scratch);
}
else {
port = ap_default_port(r);
url = "/";
}
/* now check whether we could reduce it to a local path... */
if (ap_matches_request_vhost(r, host, port)) {
rewritelog((r, 3, NULL, "reduce %s -> %s", r->filename, url));
r->filename = apr_pstrdup(r->pool, url);
}
}
return;
}
/*
* add 'http[s]://ourhost[:ourport]/' to URI
* if URI is still not fully qualified
*/
static void fully_qualify_uri(request_rec *r)
{
if (!is_absolute_uri(r->filename)) {
const char *thisserver;
char *thisport;
int port;
thisserver = ap_get_server_name(r);
port = ap_get_server_port(r);
thisport = ap_is_default_port(port, r)
? ""
: apr_psprintf(r->pool, ":%u", port);
r->filename = apr_psprintf(r->pool, "%s://%s%s%s%s",
ap_http_scheme(r), thisserver, thisport,
(*r->filename == '/') ? "" : "/",
r->filename);
}
return;
}
/*
* stat() only the first segment of a path
*/
static int prefix_stat(const char *path, apr_pool_t *pool)
{
const char *curpath = path;
const char *root;
const char *slash;
char *statpath;
apr_status_t rv;
rv = apr_filepath_root(&root, &curpath, APR_FILEPATH_TRUENAME, pool);
if (rv != APR_SUCCESS) {
return 0;
}
/* let's recognize slashes only, the mod_rewrite semantics are opaque
* enough.
*/
if ((slash = ap_strchr_c(curpath, '/')) != NULL) {
rv = apr_filepath_merge(&statpath, root,
apr_pstrndup(pool, curpath,
(apr_size_t)(slash - curpath)),
APR_FILEPATH_NOTABOVEROOT |
APR_FILEPATH_NOTRELATIVE, pool);
}
else {
rv = apr_filepath_merge(&statpath, root, curpath,
APR_FILEPATH_NOTABOVEROOT |
APR_FILEPATH_NOTRELATIVE, pool);
}
if (rv == APR_SUCCESS) {
apr_finfo_t sb;
if (apr_stat(&sb, statpath, APR_FINFO_MIN, pool) == APR_SUCCESS) {
return 1;
}
}
return 0;
}
/*
* substitute the prefix path 'match' in 'input' with 'subst' (RewriteBase)
*/
static char *subst_prefix_path(request_rec *r, char *input, char *match,
const char *subst)
{
apr_size_t len = strlen(match);
if (len && match[len - 1] == '/') {
--len;
}
if (!strncmp(input, match, len) && input[len++] == '/') {
apr_size_t slen, outlen;
char *output;
rewritelog((r, 5, NULL, "strip matching prefix: %s -> %s", input,
input+len));
slen = strlen(subst);
if (slen && subst[slen - 1] != '/') {
++slen;
}
outlen = strlen(input) + slen - len;
output = apr_palloc(r->pool, outlen + 1); /* don't forget the \0 */
memcpy(output, subst, slen);
if (slen && !output[slen-1]) {
output[slen-1] = '/';
}
memcpy(output+slen, input+len, outlen - slen);
output[outlen] = '\0';
rewritelog((r, 4, NULL, "add subst prefix: %s -> %s", input+len,
output));
return output;
}
/* prefix didn't match */
return input;
}
/*
* +-------------------------------------------------------+
* | |
* | caching support
* | |
* +-------------------------------------------------------+
*/
static void set_cache_value(const char *name, apr_time_t t, char *key,
char *val)
{
cachedmap *map;
if (cachep) {
#if APR_HAS_THREADS
apr_thread_mutex_lock(cachep->lock);
#endif
map = apr_hash_get(cachep->maps, name, APR_HASH_KEY_STRING);
if (!map) {
apr_pool_t *p;
if (apr_pool_create(&p, cachep->pool) != APR_SUCCESS) {
#if APR_HAS_THREADS
apr_thread_mutex_unlock(cachep->lock);
#endif
return;
}
map = apr_palloc(cachep->pool, sizeof(cachedmap));
map->pool = p;
map->entries = apr_hash_make(map->pool);
map->mtime = t;
apr_hash_set(cachep->maps, name, APR_HASH_KEY_STRING, map);
}
else if (map->mtime != t) {
apr_pool_clear(map->pool);
map->entries = apr_hash_make(map->pool);
map->mtime = t;
}
/* Now we should have a valid map->entries hash, where we
* can store our value.
*
* We need to copy the key and the value into OUR pool,
* so that we don't leave it during the r->pool cleanup.
*/
apr_hash_set(map->entries,
apr_pstrdup(map->pool, key), APR_HASH_KEY_STRING,
apr_pstrdup(map->pool, val));
#if APR_HAS_THREADS
apr_thread_mutex_unlock(cachep->lock);
#endif
}
return;
}
static char *get_cache_value(const char *name, apr_time_t t, char *key,
apr_pool_t *p)
{
cachedmap *map;
char *val = NULL;
if (cachep) {
#if APR_HAS_THREADS
apr_thread_mutex_lock(cachep->lock);
#endif
map = apr_hash_get(cachep->maps, name, APR_HASH_KEY_STRING);
if (map) {
/* if this map is outdated, forget it. */
if (map->mtime != t) {
apr_pool_clear(map->pool);
map->entries = apr_hash_make(map->pool);
map->mtime = t;
}
else {
val = apr_hash_get(map->entries, key, APR_HASH_KEY_STRING);
if (val) {
/* copy the cached value into the supplied pool,
* where it belongs (r->pool usually)
*/
val = apr_pstrdup(p, val);
}
}
}
#if APR_HAS_THREADS
apr_thread_mutex_unlock(cachep->lock);
#endif
}
return val;
}
static int init_cache(apr_pool_t *p)
{
cachep = apr_palloc(p, sizeof(cache));
if (apr_pool_create(&cachep->pool, p) != APR_SUCCESS) {
cachep = NULL; /* turns off cache */
return 0;
}
cachep->maps = apr_hash_make(cachep->pool);
#if APR_HAS_THREADS
(void)apr_thread_mutex_create(&(cachep->lock), APR_THREAD_MUTEX_DEFAULT, p);
#endif
return 1;
}
/*
* +-------------------------------------------------------+
* | |
* | Map Functions
* | |
* +-------------------------------------------------------+
*/
/*
* General Note: key is already a fresh string, created (expanded) just
* for the purpose to be passed in here. So one can modify key itself.
*/
static char *rewrite_mapfunc_toupper(request_rec *r, char *key)
{
char *p;
for (p = key; *p; ++p) {
*p = apr_toupper(*p);
}
return key;
}
static char *rewrite_mapfunc_tolower(request_rec *r, char *key)
{
ap_str_tolower(key);
return key;
}
static char *rewrite_mapfunc_escape(request_rec *r, char *key)
{
return ap_escape_uri(r->pool, key);
}
static char *rewrite_mapfunc_unescape(request_rec *r, char *key)
{
ap_unescape_url(key);
return key;
}
static char *select_random_value_part(request_rec *r, char *value)
{
char *p = value;
unsigned n = 1;
/* count number of distinct values */
while ((p = ap_strchr(p, '|')) != NULL) {
++n;
++p;
}
if (n > 1) {
/* initialize random generator
*
* XXX: Probably this should be wrapped into a thread mutex,
* shouldn't it? Is it worth the effort?
*/
if (!rewrite_rand_init_done) {
srand((unsigned)(getpid()));
rewrite_rand_init_done = 1;
}
/* select a random subvalue */
n = (int)(((double)(rand() % RAND_MAX) / RAND_MAX) * n + 1);
/* extract it from the whole string */
while (--n && (value = ap_strchr(value, '|')) != NULL) {
++value;
}
if (value) { /* should not be NULL, but ... */
p = ap_strchr(value, '|');
if (p) {
*p = '\0';
}
}
}
return value;
}
/* child process code */
static void rewrite_child_errfn(apr_pool_t *p, apr_status_t err,
const char *desc)
{
ap_log_error(APLOG_MARK, APLOG_ERR, err, NULL, "%s", desc);
}
static apr_status_t rewritemap_program_child(apr_pool_t *p,
const char *progname, char **argv,
apr_file_t **fpout,
apr_file_t **fpin)
{
apr_status_t rc;
apr_procattr_t *procattr;
apr_proc_t *procnew;
if ( APR_SUCCESS == (rc=apr_procattr_create(&procattr, p))
&& APR_SUCCESS == (rc=apr_procattr_io_set(procattr, APR_FULL_BLOCK,
APR_FULL_BLOCK, APR_NO_PIPE))
&& APR_SUCCESS == (rc=apr_procattr_dir_set(procattr,
ap_make_dirstr_parent(p, argv[0])))
&& APR_SUCCESS == (rc=apr_procattr_cmdtype_set(procattr, APR_PROGRAM))
&& APR_SUCCESS == (rc=apr_procattr_child_errfn_set(procattr,
rewrite_child_errfn))
&& APR_SUCCESS == (rc=apr_procattr_error_check_set(procattr, 1))) {
procnew = apr_pcalloc(p, sizeof(*procnew));
rc = apr_proc_create(procnew, argv[0], (const char **)argv, NULL,
procattr, p);
if (rc == APR_SUCCESS) {
apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
if (fpin) {
(*fpin) = procnew->in;
}
if (fpout) {
(*fpout) = procnew->out;
}
}
}
return (rc);
}
static apr_status_t run_rewritemap_programs(server_rec *s, apr_pool_t *p)
{
rewrite_server_conf *conf;
apr_hash_index_t *hi;
apr_status_t rc;
int lock_warning_issued = 0;
conf = ap_get_module_config(s->module_config, &rewrite_module);
/* If the engine isn't turned on,
* don't even try to do anything.
*/
if (conf->state == ENGINE_DISABLED) {
return APR_SUCCESS;
}
for (hi = apr_hash_first(p, conf->rewritemaps); hi; hi = apr_hash_next(hi)){
apr_file_t *fpin = NULL;
apr_file_t *fpout = NULL;
rewritemap_entry *map;
void *val;
apr_hash_this(hi, NULL, NULL, &val);
map = val;
if (map->type != MAPTYPE_PRG) {
continue;
}
if (!(map->argv[0]) || !*(map->argv[0]) || map->fpin || map->fpout) {
continue;
}
if (!lock_warning_issued && (!lockname || !*lockname)) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"mod_rewrite: Running external rewrite maps "
"without defining a RewriteLock is DANGEROUS!");
++lock_warning_issued;
}
rc = rewritemap_program_child(p, map->argv[0], map->argv,
&fpout, &fpin);
if (rc != APR_SUCCESS || fpin == NULL || fpout == NULL) {
ap_log_error(APLOG_MARK, APLOG_ERR, rc, s,
"mod_rewrite: could not start RewriteMap "
"program %s", map->checkfile);
return rc;
}
map->fpin = fpin;
map->fpout = fpout;
}
return APR_SUCCESS;
}
/*
* +-------------------------------------------------------+
* | |
* | Lookup functions
* | |
* +-------------------------------------------------------+
*/
static char *lookup_map_txtfile(request_rec *r, const char *file, char *key)
{
apr_file_t *fp = NULL;
char line[REWRITE_MAX_TXT_MAP_LINE + 1]; /* +1 for \0 */
char *value, *keylast;
if (apr_file_open(&fp, file, APR_READ|APR_BUFFERED, APR_OS_DEFAULT,
r->pool) != APR_SUCCESS) {
return NULL;
}
keylast = key + strlen(key);
value = NULL;
while (apr_file_gets(line, sizeof(line), fp) == APR_SUCCESS) {
char *p, *c;
/* ignore comments and lines starting with whitespaces */
if (*line == '#' || apr_isspace(*line)) {
continue;
}
p = line;
c = key;
while (c < keylast && *p == *c && !apr_isspace(*p)) {
++p;
++c;
}
/* key doesn't match - ignore. */
if (c != keylast || !apr_isspace(*p)) {
continue;
}
/* jump to the value */
while (*p && apr_isspace(*p)) {
++p;
}
/* no value? ignore */
if (!*p) {
continue;
}
/* extract the value and return. */
c = p;
while (*p && !apr_isspace(*p)) {
++p;
}
value = apr_pstrmemdup(r->pool, c, p - c);
break;
}
apr_file_close(fp);
return value;
}
static char *lookup_map_dbmfile(request_rec *r, const char *file,
const char *dbmtype, char *key)
{
apr_dbm_t *dbmfp = NULL;
apr_datum_t dbmkey;
apr_datum_t dbmval;
char *value;
if (apr_dbm_open_ex(&dbmfp, dbmtype, file, APR_DBM_READONLY, APR_OS_DEFAULT,
r->pool) != APR_SUCCESS) {
return NULL;
}
dbmkey.dptr = key;
dbmkey.dsize = strlen(key);
if (apr_dbm_fetch(dbmfp, dbmkey, &dbmval) == APR_SUCCESS && dbmval.dptr) {
value = apr_pstrmemdup(r->pool, dbmval.dptr, dbmval.dsize);
}
else {
value = NULL;
}
apr_dbm_close(dbmfp);
return value;
}
static char *lookup_map_dbd(request_rec *r, char *key, const char *label)
{
apr_status_t rv;
apr_dbd_prepared_t *stmt;
const char *errmsg;
apr_dbd_results_t *res = NULL;
apr_dbd_row_t *row = NULL;
const char *ret = NULL;
int n = 0;
ap_dbd_t *db = dbd_acquire(r);
stmt = apr_hash_get(db->prepared, label, APR_HASH_KEY_STRING);
rv = apr_dbd_pvselect(db->driver, r->pool, db->handle, &res,
stmt, 0, key, NULL);
if (rv != 0) {
errmsg = apr_dbd_error(db->driver, db->handle, rv);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"rewritemap: error %s querying for %s", errmsg, key);
return NULL;
}
while (rv = apr_dbd_get_row(db->driver, r->pool, res, &row, -1), rv == 0) {
++n;
if (ret == NULL) {
ret = apr_dbd_get_entry(db->driver, row, 0);
}
else {
/* randomise crudely amongst multiple results */
if ((double)rand() < (double)RAND_MAX/(double)n) {
ret = apr_dbd_get_entry(db->driver, row, 0);
}
}
}
if (rv != -1) {
errmsg = apr_dbd_error(db->driver, db->handle, rv);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"rewritemap: error %s looking up %s", errmsg, key);
}
switch (n) {
case 0:
return NULL;
case 1:
return apr_pstrdup(r->pool, ret);
default:
/* what's a fair rewritelog level for this? */
rewritelog((r, 3, NULL, "Multiple values found for %s", key));
return apr_pstrdup(r->pool, ret);
}
}
static char *lookup_map_program(request_rec *r, apr_file_t *fpin,
apr_file_t *fpout, char *key)
{
char *buf;
char c;
apr_size_t i, nbytes, combined_len = 0;
apr_status_t rv;
const char *eol = APR_EOL_STR;
apr_size_t eolc = 0;
int found_nl = 0;
result_list *buflist = NULL, *curbuf = NULL;
#ifndef NO_WRITEV
struct iovec iova[2];
apr_size_t niov;
#endif
/* when `RewriteEngine off' was used in the per-server
* context then the rewritemap-programs were not spawned.
* In this case using such a map (usually in per-dir context)
* is useless because it is not available.
*
* newlines in the key leave bytes in the pipe and cause
* bad things to happen (next map lookup will use the chars
* after the \n instead of the new key etc etc - in other words,
* the Rewritemap falls out of sync with the requests).
*/
if (fpin == NULL || fpout == NULL || ap_strchr(key, '\n')) {
return NULL;
}
/* take the lock */
if (rewrite_mapr_lock_acquire) {
rv = apr_global_mutex_lock(rewrite_mapr_lock_acquire);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"apr_global_mutex_lock(rewrite_mapr_lock_acquire) "
"failed");
return NULL; /* Maybe this should be fatal? */
}
}
/* write out the request key */
#ifdef NO_WRITEV
nbytes = strlen(key);
apr_file_write(fpin, key, &nbytes);
nbytes = 1;
apr_file_write(fpin, "\n", &nbytes);
#else
iova[0].iov_base = key;
iova[0].iov_len = strlen(key);
iova[1].iov_base = "\n";
iova[1].iov_len = 1;
niov = 2;
apr_file_writev(fpin, iova, niov, &nbytes);
#endif
buf = apr_palloc(r->pool, REWRITE_PRG_MAP_BUF + 1);
/* read in the response value */
nbytes = 1;
apr_file_read(fpout, &c, &nbytes);
do {
i = 0;
while (nbytes == 1 && (i < REWRITE_PRG_MAP_BUF)) {
if (c == eol[eolc]) {
if (!eol[++eolc]) {
/* remove eol from the buffer */
--eolc;
if (i < eolc) {
curbuf->len -= eolc-i;
i = 0;
}
else {
i -= eolc;
}
++found_nl;
break;
}
}
/* only partial (invalid) eol sequence -> reset the counter */
else if (eolc) {
eolc = 0;
}
/* catch binary mode, e.g. on Win32 */
else if (c == '\n') {
++found_nl;
break;
}
buf[i++] = c;
apr_file_read(fpout, &c, &nbytes);
}
/* well, if there wasn't a newline yet, we need to read further */
if (buflist || (nbytes == 1 && !found_nl)) {
if (!buflist) {
curbuf = buflist = apr_palloc(r->pool, sizeof(*buflist));
}
else if (i) {
curbuf->next = apr_palloc(r->pool, sizeof(*buflist));
curbuf = curbuf->next;
}
curbuf->next = NULL;
if (i) {
curbuf->string = buf;
curbuf->len = i;
combined_len += i;
buf = apr_palloc(r->pool, REWRITE_PRG_MAP_BUF);
}
if (nbytes == 1 && !found_nl) {
i = 0;
continue;
}
}
break;
} while (1);
/* concat the stuff */
if (buflist) {
char *p;
p = buf = apr_palloc(r->pool, combined_len + 1); /* \0 */
while (buflist) {
if (buflist->len) {
memcpy(p, buflist->string, buflist->len);
p += buflist->len;
}
buflist = buflist->next;
}
*p = '\0';
i = combined_len;
}
else {
buf[i] = '\0';
}
/* give the lock back */
if (rewrite_mapr_lock_acquire) {
rv = apr_global_mutex_unlock(rewrite_mapr_lock_acquire);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"apr_global_mutex_unlock(rewrite_mapr_lock_acquire) "
"failed");
return NULL; /* Maybe this should be fatal? */
}
}
/* catch the "failed" case */
if (i == 4 && !strcasecmp(buf, "NULL")) {
return NULL;
}
return buf;
}
/*
* generic map lookup
*/
static char *lookup_map(request_rec *r, char *name, char *key)
{
rewrite_server_conf *conf;
rewritemap_entry *s;
char *value;
apr_finfo_t st;
apr_status_t rv;
/* get map configuration */
conf = ap_get_module_config(r->server->module_config, &rewrite_module);
s = apr_hash_get(conf->rewritemaps, name, APR_HASH_KEY_STRING);
/* map doesn't exist */
if (!s) {
return NULL;
}
switch (s->type) {
/*
* Text file map (perhaps random)
*/
case MAPTYPE_RND:
case MAPTYPE_TXT:
rv = apr_stat(&st, s->checkfile, APR_FINFO_MIN, r->pool);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"mod_rewrite: can't access text RewriteMap file %s",
s->checkfile);
rewritelog((r, 1, NULL,
"can't open RewriteMap file, see error log"));
return NULL;
}
value = get_cache_value(s->cachename, st.mtime, key, r->pool);
if (!value) {
rewritelog((r, 6, NULL,
"cache lookup FAILED, forcing new map lookup"));
value = lookup_map_txtfile(r, s->datafile, key);
if (!value) {
rewritelog((r, 5, NULL, "map lookup FAILED: map=%s[txt] key=%s",
name, key));
set_cache_value(s->cachename, st.mtime, key, "");
return NULL;
}
rewritelog((r, 5, NULL,"map lookup OK: map=%s[txt] key=%s -> val=%s",
name, key, value));
set_cache_value(s->cachename, st.mtime, key, value);
}
else {
rewritelog((r,5,NULL,"cache lookup OK: map=%s[txt] key=%s -> val=%s",
name, key, value));
}
if (s->type == MAPTYPE_RND && *value) {
value = select_random_value_part(r, value);
rewritelog((r, 5, NULL, "randomly chosen the subvalue `%s'",value));
}
return *value ? value : NULL;
/*
* DBM file map
*/
case MAPTYPE_DBM:
rv = apr_stat(&st, s->checkfile, APR_FINFO_MIN, r->pool);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"mod_rewrite: can't access DBM RewriteMap file %s",
s->checkfile);
}
else if(s->checkfile2 != NULL) {
apr_finfo_t st2;
rv = apr_stat(&st2, s->checkfile2, APR_FINFO_MIN, r->pool);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"mod_rewrite: can't access DBM RewriteMap "
"file %s", s->checkfile2);
}
else if(st2.mtime > st.mtime) {
st.mtime = st2.mtime;
}
}
if(rv != APR_SUCCESS) {
rewritelog((r, 1, NULL,
"can't open DBM RewriteMap file, see error log"));
return NULL;
}
value = get_cache_value(s->cachename, st.mtime, key, r->pool);
if (!value) {
rewritelog((r, 6, NULL,
"cache lookup FAILED, forcing new map lookup"));
value = lookup_map_dbmfile(r, s->datafile, s->dbmtype, key);
if (!value) {
rewritelog((r, 5, NULL, "map lookup FAILED: map=%s[dbm] key=%s",
name, key));
set_cache_value(s->cachename, st.mtime, key, "");
return NULL;
}
rewritelog((r, 5, NULL, "map lookup OK: map=%s[dbm] key=%s -> "
"val=%s", name, key, value));
set_cache_value(s->cachename, st.mtime, key, value);
return value;
}
rewritelog((r, 5, NULL, "cache lookup OK: map=%s[dbm] key=%s -> val=%s",
name, key, value));
return *value ? value : NULL;
/*
* SQL map without cache
*/
case MAPTYPE_DBD:
value = lookup_map_dbd(r, key, s->dbdq);
if (!value) {
rewritelog((r, 5, NULL, "SQL map lookup FAILED: map %s key=%s",
name, key));
return NULL;
}
rewritelog((r, 5, NULL, "SQL map lookup OK: map %s key=%s, val=%s",
name, key, value));
return value;
/*
* SQL map with cache
*/
case MAPTYPE_DBD_CACHE:
value = get_cache_value(s->cachename, 0, key, r->pool);
if (!value) {
rewritelog((r, 6, NULL,
"cache lookup FAILED, forcing new map lookup"));
value = lookup_map_dbd(r, key, s->dbdq);
if (!value) {
rewritelog((r, 5, NULL, "SQL map lookup FAILED: map %s key=%s",
name, key));
set_cache_value(s->cachename, 0, key, "");
return NULL;
}
rewritelog((r, 5, NULL, "SQL map lookup OK: map %s key=%s, val=%s",
name, key, value));
set_cache_value(s->cachename, 0, key, value);
return value;
}
rewritelog((r, 5, NULL, "cache lookup OK: map=%s[SQL] key=%s, val=%s",
name, key, value));
return *value ? value : NULL;
/*
* Program file map
*/
case MAPTYPE_PRG:
value = lookup_map_program(r, s->fpin, s->fpout, key);
if (!value) {
rewritelog((r, 5,NULL,"map lookup FAILED: map=%s key=%s", name,
key));
return NULL;
}
rewritelog((r, 5, NULL, "map lookup OK: map=%s key=%s -> val=%s",
name, key, value));
return value;
/*
* Internal Map
*/
case MAPTYPE_INT:
value = s->func(r, key);
if (!value) {
rewritelog((r, 5,NULL,"map lookup FAILED: map=%s key=%s", name,
key));
return NULL;
}
rewritelog((r, 5, NULL, "map lookup OK: map=%s key=%s -> val=%s",
name, key, value));
return value;
}
return NULL;
}
/*
* lookup a HTTP header and set VARY note
*/
static const char *lookup_header(const char *name, rewrite_ctx *ctx)
{
const char *val = apr_table_get(ctx->r->headers_in, name);
if (val) {
ctx->vary_this = ctx->vary_this
? apr_pstrcat(ctx->r->pool, ctx->vary_this, ", ",
name, NULL)
: apr_pstrdup(ctx->r->pool, name);
}
return val;
}
/*
* lookahead helper function
* Determine the correct URI path in perdir context
*/
static APR_INLINE const char *la_u(rewrite_ctx *ctx)
{
rewrite_perdir_conf *conf;
if (*ctx->uri == '/') {
return ctx->uri;
}
conf = ap_get_module_config(ctx->r->per_dir_config, &rewrite_module);
return apr_pstrcat(ctx->r->pool, conf->baseurl
? conf->baseurl : conf->directory,
ctx->uri, NULL);
}
/*
* generic variable lookup
*/
static char *lookup_variable(char *var, rewrite_ctx *ctx)
{
const char *result;
request_rec *r = ctx->r;
apr_size_t varlen = strlen(var);
/* fast exit */
if (varlen < 4) {
return apr_pstrdup(r->pool, "");
}
result = NULL;
/* fast tests for variable length variables (sic) first */
if (var[3] == ':') {
if (var[4] && !strncasecmp(var, "ENV", 3)) {
var += 4;
result = apr_table_get(r->notes, var);
if (!result) {
result = apr_table_get(r->subprocess_env, var);
}
if (!result) {
result = getenv(var);
}
}
else if (var[4] && !strncasecmp(var, "SSL", 3) && rewrite_ssl_lookup) {
result = rewrite_ssl_lookup(r->pool, r->server, r->connection, r,
var + 4);
}
}
else if (var[4] == ':') {
if (var[5]) {
request_rec *rr;
const char *path;
if (!strncasecmp(var, "HTTP", 4)) {
result = lookup_header(var+5, ctx);
}
else if (!strncasecmp(var, "LA-U", 4)) {
if (ctx->uri && subreq_ok(r)) {
path = ctx->perdir ? la_u(ctx) : ctx->uri;
rr = ap_sub_req_lookup_uri(path, r, NULL);
ctx->r = rr;
result = apr_pstrdup(r->pool, lookup_variable(var+5, ctx));
ctx->r = r;
ap_destroy_sub_req(rr);
rewritelog((r, 5, ctx->perdir, "lookahead: path=%s var=%s "
"-> val=%s", path, var+5, result));
return (char *)result;
}
}
else if (!strncasecmp(var, "LA-F", 4)) {
if (ctx->uri && subreq_ok(r)) {
path = ctx->uri;
if (ctx->perdir && *path == '/') {
/* sigh, the user wants a file based subrequest, but
* we can't do one, since we don't know what the file
* path is! In this case behave like LA-U.
*/
rr = ap_sub_req_lookup_uri(path, r, NULL);
}
else {
if (ctx->perdir) {
rewrite_perdir_conf *conf;
conf = ap_get_module_config(r->per_dir_config,
&rewrite_module);
path = apr_pstrcat(r->pool, conf->directory, path,
NULL);
}
rr = ap_sub_req_lookup_file(path, r, NULL);
}
ctx->r = rr;
result = apr_pstrdup(r->pool, lookup_variable(var+5, ctx));
ctx->r = r;
ap_destroy_sub_req(rr);
rewritelog((r, 5, ctx->perdir, "lookahead: path=%s var=%s "
"-> val=%s", path, var+5, result));
return (char *)result;
}
}
}
}
/* well, do it the hard way */
else {
char *p;
apr_time_exp_t tm;
/* can't do this above, because of the getenv call */
for (p = var; *p; ++p) {
*p = apr_toupper(*p);
}
switch (varlen) {
case 4:
if (!strcmp(var, "TIME")) {
apr_time_exp_lt(&tm, apr_time_now());
result = apr_psprintf(r->pool, "%04d%02d%02d%02d%02d%02d",
tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
rewritelog((r, 1, ctx->perdir, "RESULT='%s'", result));
return (char *)result;
}
break;
case 5:
if (!strcmp(var, "HTTPS")) {
int flag = rewrite_is_https && rewrite_is_https(r->connection);
return apr_pstrdup(r->pool, flag ? "on" : "off");
}
break;
case 8:
switch (var[6]) {
case 'A':
if (!strcmp(var, "TIME_DAY")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%02d", tm.tm_mday);
}
break;
case 'E':
if (!strcmp(var, "TIME_SEC")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%02d", tm.tm_sec);
}
break;
case 'I':
if (!strcmp(var, "TIME_MIN")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%02d", tm.tm_min);
}
break;
case 'O':
if (!strcmp(var, "TIME_MON")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%02d", tm.tm_mon+1);
}
break;
}
break;
case 9:
switch (var[7]) {
case 'A':
if (var[8] == 'Y' && !strcmp(var, "TIME_WDAY")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%d", tm.tm_wday);
}
else if (!strcmp(var, "TIME_YEAR")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%04d", tm.tm_year+1900);
}
break;
case 'E':
if (!strcmp(var, "IS_SUBREQ")) {
result = (r->main ? "true" : "false");
}
break;
case 'F':
if (!strcmp(var, "PATH_INFO")) {
result = r->path_info;
}
break;
case 'P':
if (!strcmp(var, "AUTH_TYPE")) {
result = r->ap_auth_type;
}
break;
case 'S':
if (!strcmp(var, "HTTP_HOST")) {
result = lookup_header("Host", ctx);
}
break;
case 'U':
if (!strcmp(var, "TIME_HOUR")) {
apr_time_exp_lt(&tm, apr_time_now());
return apr_psprintf(r->pool, "%02d", tm.tm_hour);
}
break;
}
break;
case 11:
switch (var[8]) {
case 'A':
if (!strcmp(var, "SERVER_NAME")) {
result = ap_get_server_name(r);
}
break;
case 'D':
if (*var == 'R' && !strcmp(var, "REMOTE_ADDR")) {
result = r->connection->remote_ip;
}
else if (!strcmp(var, "SERVER_ADDR")) {
result = r->connection->local_ip;
}
break;
case 'E':
if (*var == 'H' && !strcmp(var, "HTTP_ACCEPT")) {
result = lookup_header("Accept", ctx);
}
else if (!strcmp(var, "THE_REQUEST")) {
result = r->the_request;
}
break;
case 'I':
if (!strcmp(var, "API_VERSION")) {
return apr_psprintf(r->pool, "%d:%d",
MODULE_MAGIC_NUMBER_MAJOR,
MODULE_MAGIC_NUMBER_MINOR);
}
break;
case 'K':
if (!strcmp(var, "HTTP_COOKIE")) {
result = lookup_header("Cookie", ctx);
}
break;
case 'O':
if (*var == 'S' && !strcmp(var, "SERVER_PORT")) {
return apr_psprintf(r->pool, "%u", ap_get_server_port(r));
}
else if (var[7] == 'H' && !strcmp(var, "REMOTE_HOST")) {
result = ap_get_remote_host(r->connection,r->per_dir_config,
REMOTE_NAME, NULL);
}
else if (!strcmp(var, "REMOTE_PORT")) {
return apr_itoa(r->pool, r->connection->remote_addr->port);
}
break;
case 'S':
if (*var == 'R' && !strcmp(var, "REMOTE_USER")) {
result = r->user;
}
else if (!strcmp(var, "SCRIPT_USER")) {
result = "<unknown>";
if (r->finfo.valid & APR_FINFO_USER) {
apr_uid_name_get((char **)&result, r->finfo.user,
r->pool);
}
}
break;
case 'U':
if (!strcmp(var, "REQUEST_URI")) {
result = r->uri;
}
break;
}
break;
case 12:
switch (var[3]) {
case 'I':
if (!strcmp(var, "SCRIPT_GROUP")) {
result = "<unknown>";
if (r->finfo.valid & APR_FINFO_GROUP) {
apr_gid_name_get((char **)&result, r->finfo.group,
r->pool);
}
}
break;
case 'O':
if (!strcmp(var, "REMOTE_IDENT")) {
result = ap_get_remote_logname(r);
}
break;
case 'P':
if (!strcmp(var, "HTTP_REFERER")) {
result = lookup_header("Referer", ctx);
}
break;
case 'R':
if (!strcmp(var, "QUERY_STRING")) {
result = r->args;
}
break;
case 'V':
if (!strcmp(var, "SERVER_ADMIN")) {
result = r->server->server_admin;
}
break;
}
break;
case 13:
if (!strcmp(var, "DOCUMENT_ROOT")) {
result = ap_document_root(r);
}
break;
case 14:
if (*var == 'H' && !strcmp(var, "HTTP_FORWARDED")) {
result = lookup_header("Forwarded", ctx);
}
else if (!strcmp(var, "REQUEST_METHOD")) {
result = r->method;
}
break;
case 15:
switch (var[7]) {
case 'E':
if (!strcmp(var, "HTTP_USER_AGENT")) {
result = lookup_header("User-Agent", ctx);
}
break;
case 'F':
if (!strcmp(var, "SCRIPT_FILENAME")) {
result = r->filename; /* same as request_filename (16) */
}
break;
case 'P':
if (!strcmp(var, "SERVER_PROTOCOL")) {
result = r->protocol;
}
break;
case 'S':
if (!strcmp(var, "SERVER_SOFTWARE")) {
result = ap_get_server_banner();
}
break;
}
break;
case 16:
if (!strcmp(var, "REQUEST_FILENAME")) {
result = r->filename; /* same as script_filename (15) */
}
break;
case 21:
if (!strcmp(var, "HTTP_PROXY_CONNECTION")) {
result = lookup_header("Proxy-Connection", ctx);
}
break;
}
}
return apr_pstrdup(r->pool, result ? result : "");
}
/*
* +-------------------------------------------------------+
* | |
* | Expansion functions
* | |
* +-------------------------------------------------------+
*/
/*
* Bracketed expression handling
* s points after the opening bracket
*/
static APR_INLINE char *find_closing_curly(char *s)
{
unsigned depth;
for (depth = 1; *s; ++s) {
if (*s == RIGHT_CURLY && --depth == 0) {
return s;
}
else if (*s == LEFT_CURLY) {
++depth;
}
}
return NULL;
}
static APR_INLINE char *find_char_in_curlies(char *s, int c)
{
unsigned depth;
for (depth = 1; *s; ++s) {
if (*s == c && depth == 1) {
return s;
}
else if (*s == RIGHT_CURLY && --depth == 0) {
return NULL;
}
else if (*s == LEFT_CURLY) {
++depth;
}
}
return NULL;
}
/* perform all the expansions on the input string
* putting the result into a new string
*
* for security reasons this expansion must be performed in a
* single pass, otherwise an attacker can arrange for the result
* of an earlier expansion to include expansion specifiers that
* are interpreted by a later expansion, producing results that
* were not intended by the administrator.
*/
static char *do_expand(char *input, rewrite_ctx *ctx, rewriterule_entry *entry)
{
result_list *result, *current;
result_list sresult[SMALL_EXPANSION];
unsigned spc = 0;
apr_size_t span, inputlen, outlen;
char *p, *c;
apr_pool_t *pool = ctx->r->pool;
span = strcspn(input, "\\$%");
inputlen = strlen(input);
/* fast exit */
if (inputlen == span) {
return apr_pstrdup(pool, input);
}
/* well, actually something to do */
result = current = &(sresult[spc++]);
p = input + span;
current->next = NULL;
current->string = input;
current->len = span;
outlen = span;
/* loop for specials */
do {
/* prepare next entry */
if (current->len) {
current->next = (spc < SMALL_EXPANSION)
? &(sresult[spc++])
: (result_list *)apr_palloc(pool,
sizeof(result_list));
current = current->next;
current->next = NULL;
current->len = 0;
}
/* escaped character */
if (*p == '\\') {
current->len = 1;
++outlen;
if (!p[1]) {
current->string = p;
break;
}
else {
current->string = ++p;
++p;
}
}
/* variable or map lookup */
else if (p[1] == '{') {
char *endp;
endp = find_closing_curly(p+2);
if (!endp) {
current->len = 2;
current->string = p;
outlen += 2;
p += 2;
}
/* variable lookup */
else if (*p == '%') {
p = lookup_variable(apr_pstrmemdup(pool, p+2, endp-p-2), ctx);
span = strlen(p);
current->len = span;
current->string = p;
outlen += span;
p = endp + 1;
}
/* map lookup */
else { /* *p == '$' */
char *key;
/*
* To make rewrite maps useful, the lookup key and
* default values must be expanded, so we make
* recursive calls to do the work. For security
* reasons we must never expand a string that includes
* verbatim data from the network. The recursion here
* isn't a problem because the result of expansion is
* only passed to lookup_map() so it cannot be
* re-expanded, only re-looked-up. Another way of
* looking at it is that the recursion is entirely
* driven by the syntax of the nested curly brackets.
*/
key = find_char_in_curlies(p+2, ':');
if (!key) {
current->len = 2;
current->string = p;
outlen += 2;
p += 2;
}
else {
char *map, *dflt;
map = apr_pstrmemdup(pool, p+2, endp-p-2);
key = map + (key-p-2);
*key++ = '\0';
dflt = find_char_in_curlies(key, '|');
if (dflt) {
*dflt++ = '\0';
}
/* reuse of key variable as result */
key = lookup_map(ctx->r, map, do_expand(key, ctx, entry));
if (!key && dflt && *dflt) {
key = do_expand(dflt, ctx, entry);
}
if (key) {
span = strlen(key);
current->len = span;
current->string = key;
outlen += span;
}
p = endp + 1;
}
}
}
/* backreference */
else if (apr_isdigit(p[1])) {
int n = p[1] - '0';
backrefinfo *bri = (*p == '$') ? &ctx->briRR : &ctx->briRC;
/* see ap_pregsub() in server/util.c */
if (bri->source && n < AP_MAX_REG_MATCH
&& bri->regmatch[n].rm_eo > bri->regmatch[n].rm_so) {
span = bri->regmatch[n].rm_eo - bri->regmatch[n].rm_so;
if (entry && (entry->flags & RULEFLAG_ESCAPEBACKREF)) {
/* escape the backreference */
char *tmp2, *tmp;
tmp = apr_pstrndup(pool, bri->source + bri->regmatch[n].rm_so, span);
tmp2 = ap_escape_path_segment(pool, tmp);
rewritelog((ctx->r, 5, ctx->perdir, "escaping backreference '%s' to '%s'",
tmp, tmp2));
current->len = span = strlen(tmp2);
current->string = tmp2;
}
else {
current->len = span;
current->string = bri->source + bri->regmatch[n].rm_so;
}
outlen += span;
}
p += 2;
}
/* not for us, just copy it */
else {
current->len = 1;
current->string = p++;
++outlen;
}
/* check the remainder */
if (*p && (span = strcspn(p, "\\$%")) > 0) {
if (current->len) {
current->next = (spc < SMALL_EXPANSION)
? &(sresult[spc++])
: (result_list *)apr_palloc(pool,
sizeof(result_list));
current = current->next;
current->next = NULL;
}
current->len = span;
current->string = p;
p += span;
outlen += span;
}
} while (p < input+inputlen);
/* assemble result */
c = p = apr_palloc(pool, outlen + 1); /* don't forget the \0 */
do {
if (result->len) {
ap_assert(c+result->len <= p+outlen); /* XXX: can be removed after
* extensive testing and
* review
*/
memcpy(c, result->string, result->len);
c += result->len;
}
result = result->next;
} while (result);
p[outlen] = '\0';
return p;
}
/*
* perform all the expansions on the environment variables
*/
static void do_expand_env(data_item *env, rewrite_ctx *ctx)
{
char *name, *val;
while (env) {
name = do_expand(env->data, ctx, NULL);
if ((val = ap_strchr(name, ':')) != NULL) {
*val++ = '\0';
apr_table_set(ctx->r->subprocess_env, name, val);
rewritelog((ctx->r, 5, NULL, "setting env variable '%s' to '%s'",
name, val));
}
env = env->next;
}
return;
}
/*
* perform all the expansions on the cookies
*
* TODO: use cached time similar to how logging does it
*/
static void add_cookie(request_rec *r, char *s)
{
char *var;
char *val;
char *domain;
char *expires;
char *path;
char *secure;
char *httponly;
char *tok_cntx;
char *cookie;
var = apr_strtok(s, ":", &tok_cntx);
val = apr_strtok(NULL, ":", &tok_cntx);
domain = apr_strtok(NULL, ":", &tok_cntx);
if (var && val && domain) {
request_rec *rmain = r;
char *notename;
void *data;
while (rmain->main) {
rmain = rmain->main;
}
notename = apr_pstrcat(rmain->pool, var, "_rewrite", NULL);
apr_pool_userdata_get(&data, notename, rmain->pool);
if (!data) {
char *exp_time = NULL;
expires = apr_strtok(NULL, ":", &tok_cntx);
path = expires ? apr_strtok(NULL, ":", &tok_cntx) : NULL;
secure = path ? apr_strtok(NULL, ":", &tok_cntx) : NULL;
httponly = secure ? apr_strtok(NULL, ":", &tok_cntx) : NULL;
if (expires) {
apr_time_exp_t tms;
long exp_min;
exp_min = atol(expires);
if (exp_min) {
apr_time_exp_gmt(&tms, r->request_time
+ apr_time_from_sec((60 * exp_min)));
exp_time = apr_psprintf(r->pool, "%s, %.2d-%s-%.4d "
"%.2d:%.2d:%.2d GMT",
apr_day_snames[tms.tm_wday],
tms.tm_mday,
apr_month_snames[tms.tm_mon],
tms.tm_year+1900,
tms.tm_hour, tms.tm_min, tms.tm_sec);
}
}
cookie = apr_pstrcat(rmain->pool,
var, "=", val,
"; path=", path ? path : "/",
"; domain=", domain,
expires ? (exp_time ? "; expires=" : "")
: NULL,
expires ? (exp_time ? exp_time : "")
: NULL,
(secure && (!strcasecmp(secure, "true")
|| !strcmp(secure, "1")
|| !strcasecmp(secure,
"secure"))) ?
"; secure" : NULL,
(httponly && (!strcasecmp(httponly, "true")
|| !strcmp(httponly, "1")
|| !strcasecmp(httponly,
"HttpOnly"))) ?
"; HttpOnly" : NULL,
NULL);
apr_table_addn(rmain->err_headers_out, "Set-Cookie", cookie);
apr_pool_userdata_set("set", notename, NULL, rmain->pool);
rewritelog((rmain, 5, NULL, "setting cookie '%s'", cookie));
}
else {
rewritelog((rmain, 5, NULL, "skipping already set cookie '%s'",
var));
}
}
return;
}
static void do_expand_cookie(data_item *cookie, rewrite_ctx *ctx)
{
while (cookie) {
add_cookie(ctx->r, do_expand(cookie->data, ctx, NULL));
cookie = cookie->next;
}
return;
}
#if APR_HAS_USER
/*
* Expand tilde-paths (/~user) through Unix /etc/passwd
* database information (or other OS-specific database)
*/
static char *expand_tildepaths(request_rec *r, char *uri)
{
if (uri && *uri == '/' && uri[1] == '~') {
char *p, *user;
p = user = uri + 2;
while (*p && *p != '/') {
++p;
}
if (p > user) {
char *homedir;
user = apr_pstrmemdup(r->pool, user, p-user);
if (apr_uid_homepath_get(&homedir, user, r->pool) == APR_SUCCESS) {
if (*p) {
/* reuse of user variable */
user = homedir + strlen(homedir) - 1;
if (user >= homedir && *user == '/') {
*user = '\0';
}
return apr_pstrcat(r->pool, homedir, p, NULL);
}
else {
return homedir;
}
}
}
}
return uri;
}
#endif /* if APR_HAS_USER */
/*
* +-------------------------------------------------------+
* | |
* | rewriting lockfile support
* | |
* +-------------------------------------------------------+
*/
static apr_status_t rewritelock_create(server_rec *s, apr_pool_t *p)
{
apr_status_t rc;
/* only operate if a lockfile is used */
if (lockname == NULL || *(lockname) == '\0') {
return APR_SUCCESS;
}
/* create the lockfile */
rc = apr_global_mutex_create(&rewrite_mapr_lock_acquire, lockname,
APR_LOCK_DEFAULT, p);
if (rc != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s,
"mod_rewrite: Parent could not create RewriteLock "
"file %s", lockname);
return rc;
}
#ifdef AP_NEED_SET_MUTEX_PERMS
rc = ap_unixd_set_global_mutex_perms(rewrite_mapr_lock_acquire);
if (rc != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s,
"mod_rewrite: Parent could not set permissions "
"on RewriteLock; check User and Group directives");
return rc;
}
#endif
return APR_SUCCESS;
}
static apr_status_t rewritelock_remove(void *data)
{
/* only operate if a lockfile is used */
if (lockname == NULL || *(lockname) == '\0') {
return APR_SUCCESS;
}
/* destroy the rewritelock */
apr_global_mutex_destroy (rewrite_mapr_lock_acquire);
rewrite_mapr_lock_acquire = NULL;
lockname = NULL;
return(0);
}
/*
* +-------------------------------------------------------+
* | |
* | configuration directive handling
* | |
* +-------------------------------------------------------+
*/
/*
* own command line parser for RewriteRule and RewriteCond,
* which doesn't have the '\\' problem.
* (returns true on error)
*
* XXX: what an inclined parser. Seems we have to leave it so
* for backwards compat. *sigh*
*/
static int parseargline(char *str, char **a1, char **a2, char **a3)
{
char quote;
while (apr_isspace(*str)) {
++str;
}
/*
* determine first argument
*/
quote = (*str == '"' || *str == '\'') ? *str++ : '\0';
*a1 = str;
for (; *str; ++str) {
if ((apr_isspace(*str) && !quote) || (*str == quote)) {
break;
}
if (*str == '\\' && apr_isspace(str[1])) {
++str;
continue;
}
}
if (!*str) {
return 1;
}
*str++ = '\0';
while (apr_isspace(*str)) {
++str;
}
/*
* determine second argument
*/
quote = (*str == '"' || *str == '\'') ? *str++ : '\0';
*a2 = str;
for (; *str; ++str) {
if ((apr_isspace(*str) && !quote) || (*str == quote)) {
break;
}
if (*str == '\\' && apr_isspace(str[1])) {
++str;
continue;
}
}
if (!*str) {
*a3 = NULL; /* 3rd argument is optional */
return 0;
}
*str++ = '\0';
while (apr_isspace(*str)) {
++str;
}
if (!*str) {
*a3 = NULL; /* 3rd argument is still optional */
return 0;
}
/*
* determine third argument
*/
quote = (*str == '"' || *str == '\'') ? *str++ : '\0';
*a3 = str;
for (; *str; ++str) {
if ((apr_isspace(*str) && !quote) || (*str == quote)) {
break;
}
if (*str == '\\' && apr_isspace(str[1])) {
++str;
continue;
}
}
*str = '\0';
return 0;
}
static void *config_server_create(apr_pool_t *p, server_rec *s)
{
rewrite_server_conf *a;
a = (rewrite_server_conf *)apr_pcalloc(p, sizeof(rewrite_server_conf));
a->state = ENGINE_DISABLED;
a->options = OPTION_NONE;
#ifndef REWRITELOG_DISABLED
a->rewritelogfile = NULL;
a->rewritelogfp = NULL;
a->rewriteloglevel = 0;
#endif
a->rewritemaps = apr_hash_make(p);
a->rewriteconds = apr_array_make(p, 2, sizeof(rewritecond_entry));
a->rewriterules = apr_array_make(p, 2, sizeof(rewriterule_entry));
a->server = s;
return (void *)a;
}
static void *config_server_merge(apr_pool_t *p, void *basev, void *overridesv)
{
rewrite_server_conf *a, *base, *overrides;
a = (rewrite_server_conf *)apr_pcalloc(p,
sizeof(rewrite_server_conf));
base = (rewrite_server_conf *)basev;
overrides = (rewrite_server_conf *)overridesv;
a->state = overrides->state;
a->options = overrides->options;
a->server = overrides->server;
if (a->options & OPTION_INHERIT) {
/*
* local directives override
* and anything else is inherited
*/
#ifndef REWRITELOG_DISABLED
a->rewriteloglevel = overrides->rewriteloglevel != 0
? overrides->rewriteloglevel
: base->rewriteloglevel;
a->rewritelogfile = overrides->rewritelogfile != NULL
? overrides->rewritelogfile
: base->rewritelogfile;
a->rewritelogfp = overrides->rewritelogfp != NULL
? overrides->rewritelogfp
: base->rewritelogfp;
#endif
a->rewritemaps = apr_hash_overlay(p, overrides->rewritemaps,
base->rewritemaps);
a->rewriteconds = apr_array_append(p, overrides->rewriteconds,
base->rewriteconds);
a->rewriterules = apr_array_append(p, overrides->rewriterules,
base->rewriterules);
}
else {
/*
* local directives override
* and anything else gets defaults
*/
#ifndef REWRITELOG_DISABLED
a->rewriteloglevel = overrides->rewriteloglevel;
a->rewritelogfile = overrides->rewritelogfile;
a->rewritelogfp = overrides->rewritelogfp;
#endif
a->rewritemaps = overrides->rewritemaps;
a->rewriteconds = overrides->rewriteconds;
a->rewriterules = overrides->rewriterules;
}
return (void *)a;
}
static void *config_perdir_create(apr_pool_t *p, char *path)
{
rewrite_perdir_conf *a;
a = (rewrite_perdir_conf *)apr_pcalloc(p, sizeof(rewrite_perdir_conf));
a->state = ENGINE_DISABLED;
a->options = OPTION_NONE;
a->baseurl = NULL;
a->rewriteconds = apr_array_make(p, 2, sizeof(rewritecond_entry));
a->rewriterules = apr_array_make(p, 2, sizeof(rewriterule_entry));
if (path == NULL) {
a->directory = NULL;
}
else {
/* make sure it has a trailing slash */
if (path[strlen(path)-1] == '/') {
a->directory = apr_pstrdup(p, path);
}
else {
a->directory = apr_pstrcat(p, path, "/", NULL);
}
}
return (void *)a;
}
static void *config_perdir_merge(apr_pool_t *p, void *basev, void *overridesv)
{
rewrite_perdir_conf *a, *base, *overrides;
a = (rewrite_perdir_conf *)apr_pcalloc(p,
sizeof(rewrite_perdir_conf));
base = (rewrite_perdir_conf *)basev;
overrides = (rewrite_perdir_conf *)overridesv;
a->state = overrides->state;
a->options = overrides->options;
a->directory = overrides->directory;
a->baseurl = overrides->baseurl;
if (a->options & OPTION_INHERIT) {
a->rewriteconds = apr_array_append(p, overrides->rewriteconds,
base->rewriteconds);
a->rewriterules = apr_array_append(p, overrides->rewriterules,
base->rewriterules);
}
else {
a->rewriteconds = overrides->rewriteconds;
a->rewriterules = overrides->rewriterules;
}
return (void *)a;
}
static const char *cmd_rewriteengine(cmd_parms *cmd,
void *in_dconf, int flag)
{
rewrite_perdir_conf *dconf = in_dconf;
rewrite_server_conf *sconf;
sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
if (cmd->path == NULL) { /* is server command */
sconf->state = (flag ? ENGINE_ENABLED : ENGINE_DISABLED);
}
else /* is per-directory command */ {
dconf->state = (flag ? ENGINE_ENABLED : ENGINE_DISABLED);
}
return NULL;
}
static const char *cmd_rewriteoptions(cmd_parms *cmd,
void *in_dconf, const char *option)
{
int options = 0;
char *w;
while (*option) {
w = ap_getword_conf(cmd->pool, &option);
if (!strcasecmp(w, "inherit")) {
options |= OPTION_INHERIT;
}
else if (!strncasecmp(w, "MaxRedirects=", 13)) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
"RewriteOptions: MaxRedirects option has been "
"removed in favor of the global "
"LimitInternalRecursion directive and will be "
"ignored.");
}
else {
return apr_pstrcat(cmd->pool, "RewriteOptions: unknown option '",
w, "'", NULL);
}
}
/* put it into the appropriate config */
if (cmd->path == NULL) { /* is server command */
rewrite_server_conf *conf =
ap_get_module_config(cmd->server->module_config,
&rewrite_module);
conf->options |= options;
}
else { /* is per-directory command */
rewrite_perdir_conf *conf = in_dconf;
conf->options |= options;
}
return NULL;
}
#ifndef REWRITELOG_DISABLED
static const char *cmd_rewritelog(cmd_parms *cmd, void *dconf, const char *a1)
{
rewrite_server_conf *sconf;
sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
sconf->rewritelogfile = a1;
return NULL;
}
static const char *cmd_rewriteloglevel(cmd_parms *cmd, void *dconf,
const char *a1)
{
rewrite_server_conf *sconf;
sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
sconf->rewriteloglevel = atoi(a1);
return NULL;
}
#endif /* rewritelog */
static const char *cmd_rewritemap(cmd_parms *cmd, void *dconf, const char *a1,
const char *a2)
{
rewrite_server_conf *sconf;
rewritemap_entry *newmap;
apr_finfo_t st;
const char *fname;
sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
newmap = apr_palloc(cmd->pool, sizeof(rewritemap_entry));
newmap->func = NULL;
if (strncasecmp(a2, "txt:", 4) == 0) {
if ((fname = ap_server_root_relative(cmd->pool, a2+4)) == NULL) {
return apr_pstrcat(cmd->pool, "RewriteMap: bad path to txt map: ",
a2+4, NULL);
}
newmap->type = MAPTYPE_TXT;
newmap->datafile = fname;
newmap->checkfile = fname;
newmap->checkfile2= NULL;
newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
(void *)cmd->server, a1);
}
else if (strncasecmp(a2, "rnd:", 4) == 0) {
if ((fname = ap_server_root_relative(cmd->pool, a2+4)) == NULL) {
return apr_pstrcat(cmd->pool, "RewriteMap: bad path to rnd map: ",
a2+4, NULL);
}
newmap->type = MAPTYPE_RND;
newmap->datafile = fname;
newmap->checkfile = fname;
newmap->checkfile2= NULL;
newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
(void *)cmd->server, a1);
}
else if (strncasecmp(a2, "dbm", 3) == 0) {
apr_status_t rv;
newmap->type = MAPTYPE_DBM;
fname = NULL;
newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
(void *)cmd->server, a1);
if (a2[3] == ':') {
newmap->dbmtype = "default";
fname = a2+4;
}
else if (a2[3] == '=') {
const char *colon = ap_strchr_c(a2 + 4, ':');
if (colon) {
newmap->dbmtype = apr_pstrndup(cmd->pool, a2 + 4,
colon - (a2 + 3) - 1);
fname = colon + 1;
}
}
if (!fname) {
return apr_pstrcat(cmd->pool, "RewriteMap: bad map:",
a2, NULL);
}
if ((newmap->datafile = ap_server_root_relative(cmd->pool,
fname)) == NULL) {
return apr_pstrcat(cmd->pool, "RewriteMap: bad path to dbm map: ",
fname, NULL);
}
rv = apr_dbm_get_usednames_ex(cmd->pool, newmap->dbmtype,
newmap->datafile, &newmap->checkfile,
&newmap->checkfile2);
if (rv != APR_SUCCESS) {
return apr_pstrcat(cmd->pool, "RewriteMap: dbm type ",
newmap->dbmtype, " is invalid", NULL);
}
}
else if ((strncasecmp(a2, "dbd:", 4) == 0)
|| (strncasecmp(a2, "fastdbd:", 8) == 0)) {
if (dbd_prepare == NULL) {
return "RewriteMap types dbd and fastdbd require mod_dbd!";
}
if ((a2[0] == 'd') || (a2[0] == 'D')) {
newmap->type = MAPTYPE_DBD;
fname = a2+4;
}
else {
newmap->type = MAPTYPE_DBD_CACHE;
fname = a2+8;
newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
(void *)cmd->server, a1);
}
newmap->dbdq = a1;
dbd_prepare(cmd->server, fname, newmap->dbdq);
}
else if (strncasecmp(a2, "prg:", 4) == 0) {
apr_tokenize_to_argv(a2 + 4, &newmap->argv, cmd->pool);
fname = newmap->argv[0];
if ((newmap->argv[0] = ap_server_root_relative(cmd->pool,
fname)) == NULL) {
return apr_pstrcat(cmd->pool, "RewriteMap: bad path to prg map: ",
fname, NULL);
}
newmap->type = MAPTYPE_PRG;
newmap->datafile = NULL;
newmap->checkfile = newmap->argv[0];
newmap->checkfile2= NULL;
newmap->cachename = NULL;
}
else if (strncasecmp(a2, "int:", 4) == 0) {
newmap->type = MAPTYPE_INT;
newmap->datafile = NULL;
newmap->checkfile = NULL;
newmap->checkfile2= NULL;
newmap->cachename = NULL;
newmap->func = (char *(*)(request_rec *,char *))
apr_hash_get(mapfunc_hash, a2+4, strlen(a2+4));
if ((sconf->state == ENGINE_ENABLED) && (newmap->func == NULL)) {
return apr_pstrcat(cmd->pool, "RewriteMap: internal map not found:",
a2+4, NULL);
}
}
else {
if ((fname = ap_server_root_relative(cmd->pool, a2)) == NULL) {
return apr_pstrcat(cmd->pool, "RewriteMap: bad path to txt map: ",
a2, NULL);
}
newmap->type = MAPTYPE_TXT;
newmap->datafile = fname;
newmap->checkfile = fname;
newmap->checkfile2= NULL;
newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
(void *)cmd->server, a1);
}
newmap->fpin = NULL;
newmap->fpout = NULL;
if (newmap->checkfile && (sconf->state == ENGINE_ENABLED)
&& (apr_stat(&st, newmap->checkfile, APR_FINFO_MIN,
cmd->pool) != APR_SUCCESS)) {
return apr_pstrcat(cmd->pool,
"RewriteMap: file for map ", a1,
" not found:", newmap->checkfile, NULL);
}
apr_hash_set(sconf->rewritemaps, a1, APR_HASH_KEY_STRING, newmap);
return NULL;
}
static const char *cmd_rewritelock(cmd_parms *cmd, void *dconf, const char *a1)
{
const char *error;
if ((error = ap_check_cmd_context(cmd, GLOBAL_ONLY)) != NULL)
return error;
/* fixup the path, especially for rewritelock_remove() */
lockname = ap_server_root_relative(cmd->pool, a1);
if (!lockname) {
return apr_pstrcat(cmd->pool, "Invalid RewriteLock path ", a1, NULL);
}
return NULL;
}
static const char *cmd_rewritebase(cmd_parms *cmd, void *in_dconf,
const char *a1)
{
rewrite_perdir_conf *dconf = in_dconf;
if (cmd->path == NULL || dconf == NULL) {
return "RewriteBase: only valid in per-directory config files";
}
if (a1[0] == '\0') {
return "RewriteBase: empty URL not allowed";
}
if (a1[0] != '/') {
return "RewriteBase: argument is not a valid URL";
}
dconf->baseurl = a1;
return NULL;
}
/*
* generic lexer for RewriteRule and RewriteCond flags.
* The parser will be passed in as a function pointer
* and called if a flag was found
*/
static const char *cmd_parseflagfield(apr_pool_t *p, void *cfg, char *key,
const char *(*parse)(apr_pool_t *,
void *,
char *, char *))
{
char *val, *nextp, *endp;
const char *err;
endp = key + strlen(key) - 1;
if (*key != '[' || *endp != ']') {
return "RewriteCond: bad flag delimiters";
}
*endp = ','; /* for simpler parsing */
++key;
while (*key) {
/* skip leading spaces */
while (apr_isspace(*key)) {
++key;
}
if (!*key || (nextp = ap_strchr(key, ',')) == NULL) { /* NULL should not
* happen, but ...
*/
break;
}
/* strip trailing spaces */
endp = nextp - 1;
while (apr_isspace(*endp)) {
--endp;
}
*++endp = '\0';
/* split key and val */
val = ap_strchr(key, '=');
if (val) {
*val++ = '\0';
}
else {
val = endp;
}
err = parse(p, cfg, key, val);
if (err) {
return err;
}
key = nextp + 1;
}
return NULL;
}
static const char *cmd_rewritecond_setflag(apr_pool_t *p, void *_cfg,
char *key, char *val)
{
rewritecond_entry *cfg = _cfg;
if ( strcasecmp(key, "nocase") == 0
|| strcasecmp(key, "NC") == 0 ) {
cfg->flags |= CONDFLAG_NOCASE;
}
else if ( strcasecmp(key, "ornext") == 0
|| strcasecmp(key, "OR") == 0 ) {
cfg->flags |= CONDFLAG_ORNEXT;
}
else if ( strcasecmp(key, "novary") == 0
|| strcasecmp(key, "NV") == 0 ) {
cfg->flags |= CONDFLAG_NOVARY;
}
else {
return apr_pstrcat(p, "RewriteCond: unknown flag '", key, "'", NULL);
}
return NULL;
}
static const char *cmd_rewritecond(cmd_parms *cmd, void *in_dconf,
const char *in_str)
{
rewrite_perdir_conf *dconf = in_dconf;
char *str = apr_pstrdup(cmd->pool, in_str);
rewrite_server_conf *sconf;
rewritecond_entry *newcond;
ap_regex_t *regexp;
char *a1;
char *a2;
char *a3;
const char *err;
sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
/* make a new entry in the internal temporary rewrite rule list */
if (cmd->path == NULL) { /* is server command */
newcond = apr_array_push(sconf->rewriteconds);
}
else { /* is per-directory command */
newcond = apr_array_push(dconf->rewriteconds);
}
/* parse the argument line ourself
* a1 .. a3 are substrings of str, which is a fresh copy
* of the argument line. So we can use a1 .. a3 without
* copying them again.
*/
if (parseargline(str, &a1, &a2, &a3)) {
return apr_pstrcat(cmd->pool, "RewriteCond: bad argument line '", str,
"'", NULL);
}
/* arg1: the input string */
newcond->input = a1;
/* arg3: optional flags field
* (this has to be parsed first, because we need to
* know if the regex should be compiled with ICASE!)
*/
newcond->flags = CONDFLAG_NONE;
if (a3 != NULL) {
if ((err = cmd_parseflagfield(cmd->pool, newcond, a3,
cmd_rewritecond_setflag)) != NULL) {
return err;
}
}
/* arg2: the pattern */
if (*a2 == '!') {
newcond->flags |= CONDFLAG_NOTMATCH;
++a2;
}
/* determine the pattern type */
newcond->ptype = 0;
if (*a2 && a2[1]) {
if (!a2[2] && *a2 == '-') {
switch (a2[1]) {
case 'f': newcond->ptype = CONDPAT_FILE_EXISTS; break;
case 's': newcond->ptype = CONDPAT_FILE_SIZE; break;
case 'l': newcond->ptype = CONDPAT_FILE_LINK; break;
case 'd': newcond->ptype = CONDPAT_FILE_DIR; break;
case 'x': newcond->ptype = CONDPAT_FILE_XBIT; break;
case 'U': newcond->ptype = CONDPAT_LU_URL; break;
case 'F': newcond->ptype = CONDPAT_LU_FILE; break;
}
}
else {
switch (*a2) {
case '>': newcond->ptype = CONDPAT_STR_GT; break;
case '<': newcond->ptype = CONDPAT_STR_LT; break;
case '=': newcond->ptype = CONDPAT_STR_EQ;
/* "" represents an empty string */
if (*++a2 == '"' && a2[1] == '"' && !a2[2]) {
a2 += 2;
}
break;
}
}
}
if (newcond->ptype && newcond->ptype != CONDPAT_STR_EQ &&
(newcond->flags & CONDFLAG_NOCASE)) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
"RewriteCond: NoCase option for non-regex pattern '%s' "
"is not supported and will be ignored.", a2);
newcond->flags &= ~CONDFLAG_NOCASE;
}
newcond->pattern = a2;
if (!newcond->ptype) {
regexp = ap_pregcomp(cmd->pool, a2,
AP_REG_EXTENDED | ((newcond->flags & CONDFLAG_NOCASE)
? AP_REG_ICASE : 0));
if (!regexp) {
return apr_pstrcat(cmd->pool, "RewriteCond: cannot compile regular "
"expression '", a2, "'", NULL);
}
newcond->regexp = regexp;
}
return NULL;
}
static const char *cmd_rewriterule_setflag(apr_pool_t *p, void *_cfg,
char *key, char *val)
{
rewriterule_entry *cfg = _cfg;
int error = 0;
switch (*key++) {
case 'b':
case 'B':
if (!*key || !strcasecmp(key, "ackrefescaping")) {
cfg->flags |= RULEFLAG_ESCAPEBACKREF;
}
else {
++error;
}
break;
case 'c':
case 'C':
if (!*key || !strcasecmp(key, "hain")) { /* chain */
cfg->flags |= RULEFLAG_CHAIN;
}
else if (((*key == 'O' || *key == 'o') && !key[1])
|| !strcasecmp(key, "ookie")) { /* cookie */
data_item *cp = cfg->cookie;
if (!cp) {
cp = cfg->cookie = apr_palloc(p, sizeof(*cp));
}
else {
while (cp->next) {
cp = cp->next;
}
cp->next = apr_palloc(p, sizeof(*cp));
cp = cp->next;
}
cp->next = NULL;
cp->data = val;
}
else {
++error;
}
break;
case 'e':
case 'E':
if (!*key || !strcasecmp(key, "nv")) { /* env */
data_item *cp = cfg->env;
if (!cp) {
cp = cfg->env = apr_palloc(p, sizeof(*cp));
}
else {
while (cp->next) {
cp = cp->next;
}
cp->next = apr_palloc(p, sizeof(*cp));
cp = cp->next;
}
cp->next = NULL;
cp->data = val;
}
else {
++error;
}
break;
case 'f':
case 'F':
if (!*key || !strcasecmp(key, "orbidden")) { /* forbidden */
cfg->flags |= (RULEFLAG_STATUS | RULEFLAG_NOSUB);
cfg->forced_responsecode = HTTP_FORBIDDEN;
}
else {
++error;
}
break;
case 'g':
case 'G':
if (!*key || !strcasecmp(key, "one")) { /* gone */
cfg->flags |= (RULEFLAG_STATUS | RULEFLAG_NOSUB);
cfg->forced_responsecode = HTTP_GONE;
}
else {
++error;
}
break;
case 'h':
case 'H':
if (!*key || !strcasecmp(key, "andler")) { /* handler */
cfg->forced_handler = val;
}
else {
++error;
}
break;
case 'l':
case 'L':
if (!*key || !strcasecmp(key, "ast")) { /* last */
cfg->flags |= RULEFLAG_LASTRULE;
}
else {
++error;
}
break;
case 'n':
case 'N':
if (((*key == 'E' || *key == 'e') && !key[1])
|| !strcasecmp(key, "oescape")) { /* noescape */
cfg->flags |= RULEFLAG_NOESCAPE;
}
else if (!*key || !strcasecmp(key, "ext")) { /* next */
cfg->flags |= RULEFLAG_NEWROUND;
}
else if (((*key == 'S' || *key == 's') && !key[1])
|| !strcasecmp(key, "osubreq")) { /* nosubreq */
cfg->flags |= RULEFLAG_IGNOREONSUBREQ;
}
else if (((*key == 'C' || *key == 'c') && !key[1])
|| !strcasecmp(key, "ocase")) { /* nocase */
cfg->flags |= RULEFLAG_NOCASE;
}
else {
++error;
}
break;
case 'p':
case 'P':
if (!*key || !strcasecmp(key, "roxy")) { /* proxy */
cfg->flags |= RULEFLAG_PROXY;
}
else if (((*key == 'T' || *key == 't') && !key[1])
|| !strcasecmp(key, "assthrough")) { /* passthrough */
cfg->flags |= RULEFLAG_PASSTHROUGH;
}
else {
++error;
}
break;
case 'q':
case 'Q':
if ( !strcasecmp(key, "SA")
|| !strcasecmp(key, "sappend")) { /* qsappend */
cfg->flags |= RULEFLAG_QSAPPEND;
}
else {
++error;
}
break;
case 'r':
case 'R':
if (!*key || !strcasecmp(key, "edirect")) { /* redirect */
int status = 0;
cfg->flags |= RULEFLAG_FORCEREDIRECT;
if (strlen(val) > 0) {
if (strcasecmp(val, "permanent") == 0) {
status = HTTP_MOVED_PERMANENTLY;
}
else if (strcasecmp(val, "temp") == 0) {
status = HTTP_MOVED_TEMPORARILY;
}
else if (strcasecmp(val, "seeother") == 0) {
status = HTTP_SEE_OTHER;
}
else if (apr_isdigit(*val)) {
status = atoi(val);
if (status != HTTP_INTERNAL_SERVER_ERROR) {
int idx =
ap_index_of_response(HTTP_INTERNAL_SERVER_ERROR);
if (ap_index_of_response(status) == idx) {
return apr_psprintf(p, "RewriteRule: invalid HTTP "
"response code '%s' for "
"flag 'R'",
val);
}
}
if (!ap_is_HTTP_REDIRECT(status)) {
cfg->flags |= (RULEFLAG_STATUS | RULEFLAG_NOSUB);
}
}
cfg->forced_responsecode = status;
}
}
else {
++error;
}
break;
case 's':
case 'S':
if (!*key || !strcasecmp(key, "kip")) { /* skip */
cfg->skip = atoi(val);
}
else {
++error;
}
break;
case 't':
case 'T':
if (!*key || !strcasecmp(key, "ype")) { /* type */
cfg->forced_mimetype = val;
}
else {
++error;
}
break;
default:
++error;
break;
}
if (error) {
return apr_pstrcat(p, "RewriteRule: unknown flag '", --key, "'", NULL);
}
return NULL;
}
static const char *cmd_rewriterule(cmd_parms *cmd, void *in_dconf,
const char *in_str)
{
rewrite_perdir_conf *dconf = in_dconf;
char *str = apr_pstrdup(cmd->pool, in_str);
rewrite_server_conf *sconf;
rewriterule_entry *newrule;
ap_regex_t *regexp;
char *a1;
char *a2;
char *a3;
const char *err;
sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
/* make a new entry in the internal rewrite rule list */
if (cmd->path == NULL) { /* is server command */
newrule = apr_array_push(sconf->rewriterules);
}
else { /* is per-directory command */
newrule = apr_array_push(dconf->rewriterules);
}
/* parse the argument line ourself */
if (parseargline(str, &a1, &a2, &a3)) {
return apr_pstrcat(cmd->pool, "RewriteRule: bad argument line '", str,
"'", NULL);
}
/* arg3: optional flags field */
newrule->forced_mimetype = NULL;
newrule->forced_handler = NULL;
newrule->forced_responsecode = HTTP_MOVED_TEMPORARILY;
newrule->flags = RULEFLAG_NONE;
newrule->env = NULL;
newrule->cookie = NULL;
newrule->skip = 0;
if (a3 != NULL) {
if ((err = cmd_parseflagfield(cmd->pool, newrule, a3,
cmd_rewriterule_setflag)) != NULL) {
return err;
}
}
/* arg1: the pattern
* try to compile the regexp to test if is ok
*/
if (*a1 == '!') {
newrule->flags |= RULEFLAG_NOTMATCH;
++a1;
}
regexp = ap_pregcomp(cmd->pool, a1, AP_REG_EXTENDED |
((newrule->flags & RULEFLAG_NOCASE)
? AP_REG_ICASE : 0));
if (!regexp) {
return apr_pstrcat(cmd->pool,
"RewriteRule: cannot compile regular expression '",
a1, "'", NULL);
}
newrule->pattern = a1;
newrule->regexp = regexp;
/* arg2: the output string */
newrule->output = a2;
if (*a2 == '-' && !a2[1]) {
newrule->flags |= RULEFLAG_NOSUB;
}
/* now, if the server or per-dir config holds an
* array of RewriteCond entries, we take it for us
* and clear the array
*/
if (cmd->path == NULL) { /* is server command */
newrule->rewriteconds = sconf->rewriteconds;
sconf->rewriteconds = apr_array_make(cmd->pool, 2,
sizeof(rewritecond_entry));
}
else { /* is per-directory command */
newrule->rewriteconds = dconf->rewriteconds;
dconf->rewriteconds = apr_array_make(cmd->pool, 2,
sizeof(rewritecond_entry));
}
return NULL;
}
/*
* +-------------------------------------------------------+
* | |
* | the rewriting engine
* | |
* +-------------------------------------------------------+
*/
/* Lexicographic Compare */
static APR_INLINE int compare_lexicography(char *a, char *b)
{
apr_size_t i, lena, lenb;
lena = strlen(a);
lenb = strlen(b);
if (lena == lenb) {
for (i = 0; i < lena; ++i) {
if (a[i] != b[i]) {
return ((unsigned char)a[i] > (unsigned char)b[i]) ? 1 : -1;
}
}
return 0;
}
return ((lena > lenb) ? 1 : -1);
}
/*
* Apply a single rewriteCond
*/
static int apply_rewrite_cond(rewritecond_entry *p, rewrite_ctx *ctx)
{
char *input = do_expand(p->input, ctx, NULL);
apr_finfo_t sb;
request_rec *rsub, *r = ctx->r;
ap_regmatch_t regmatch[AP_MAX_REG_MATCH];
int rc = 0;
switch (p->ptype) {
case CONDPAT_FILE_EXISTS:
if ( apr_stat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS
&& sb.filetype == APR_REG) {
rc = 1;
}
break;
case CONDPAT_FILE_SIZE:
if ( apr_stat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS
&& sb.filetype == APR_REG && sb.size > 0) {
rc = 1;
}
break;
case CONDPAT_FILE_LINK:
#if !defined(OS2)
if ( apr_stat(&sb, input, APR_FINFO_MIN | APR_FINFO_LINK,
r->pool) == APR_SUCCESS
&& sb.filetype == APR_LNK) {
rc = 1;
}
#endif
break;
case CONDPAT_FILE_DIR:
if ( apr_stat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS
&& sb.filetype == APR_DIR) {
rc = 1;
}
break;
case CONDPAT_FILE_XBIT:
if ( apr_stat(&sb, input, APR_FINFO_PROT, r->pool) == APR_SUCCESS
&& (sb.protection & (APR_UEXECUTE | APR_GEXECUTE | APR_WEXECUTE))) {
rc = 1;
}
break;
case CONDPAT_LU_URL:
if (*input && subreq_ok(r)) {
rsub = ap_sub_req_lookup_uri(input, r, NULL);
if (rsub->status < 400) {
rc = 1;
}
rewritelog((r, 5, NULL, "RewriteCond URI (-U) check: "
"path=%s -> status=%d", input, rsub->status));
ap_destroy_sub_req(rsub);
}
break;
case CONDPAT_LU_FILE:
if (*input && subreq_ok(r)) {
rsub = ap_sub_req_lookup_file(input, r, NULL);
if (rsub->status < 300 &&
/* double-check that file exists since default result is 200 */
apr_stat(&sb, rsub->filename, APR_FINFO_MIN,
r->pool) == APR_SUCCESS) {
rc = 1;
}
rewritelog((r, 5, NULL, "RewriteCond file (-F) check: path=%s "
"-> file=%s status=%d", input, rsub->filename,
rsub->status));
ap_destroy_sub_req(rsub);
}
break;
case CONDPAT_STR_GT:
rc = (compare_lexicography(input, p->pattern+1) == 1) ? 1 : 0;
break;
case CONDPAT_STR_LT:
rc = (compare_lexicography(input, p->pattern+1) == -1) ? 1 : 0;
break;
case CONDPAT_STR_EQ:
if (p->flags & CONDFLAG_NOCASE) {
rc = !strcasecmp(input, p->pattern);
}
else {
rc = !strcmp(input, p->pattern);
}
break;
default:
/* it is really a regexp pattern, so apply it */
rc = !ap_regexec(p->regexp, input, AP_MAX_REG_MATCH, regmatch, 0);
/* update briRC backref info */
if (rc && !(p->flags & CONDFLAG_NOTMATCH)) {
ctx->briRC.source = input;
ctx->briRC.nsub = p->regexp->re_nsub;
memcpy(ctx->briRC.regmatch, regmatch, sizeof(regmatch));
}
break;
}
if (p->flags & CONDFLAG_NOTMATCH) {
rc = !rc;
}
rewritelog((r, 4, ctx->perdir, "RewriteCond: input='%s' pattern='%s%s%s'%s "
"=> %s", input, (p->flags & CONDFLAG_NOTMATCH) ? "!" : "",
(p->ptype == CONDPAT_STR_EQ) ? "=" : "", p->pattern,
(p->flags & CONDFLAG_NOCASE) ? " [NC]" : "",
rc ? "matched" : "not-matched"));
return rc;
}
/* check for forced type and handler */
static APR_INLINE void force_type_handler(rewriterule_entry *p,
rewrite_ctx *ctx)
{
char *expanded;
if (p->forced_mimetype) {
expanded = do_expand(p->forced_mimetype, ctx, p);
if (*expanded) {
ap_str_tolower(expanded);
rewritelog((ctx->r, 2, ctx->perdir, "remember %s to have MIME-type "
"'%s'", ctx->r->filename, expanded));
apr_table_setn(ctx->r->notes, REWRITE_FORCED_MIMETYPE_NOTEVAR,
expanded);
}
}
if (p->forced_handler) {
expanded = do_expand(p->forced_handler, ctx, p);
if (*expanded) {
ap_str_tolower(expanded);
rewritelog((ctx->r, 2, ctx->perdir, "remember %s to have "
"Content-handler '%s'", ctx->r->filename, expanded));
apr_table_setn(ctx->r->notes, REWRITE_FORCED_HANDLER_NOTEVAR,
expanded);
}
}
}
/*
* Apply a single RewriteRule
*/
static int apply_rewrite_rule(rewriterule_entry *p, rewrite_ctx *ctx)
{
ap_regmatch_t regmatch[AP_MAX_REG_MATCH];
apr_array_header_t *rewriteconds;
rewritecond_entry *conds;
int i, rc;
char *newuri = NULL;
request_rec *r = ctx->r;
int is_proxyreq = 0;
ctx->uri = r->filename;
if (ctx->perdir) {
apr_size_t dirlen = strlen(ctx->perdir);
/*
* Proxy request?
*/
is_proxyreq = ( r->proxyreq && r->filename
&& !strncmp(r->filename, "proxy:", 6));
/* Since we want to match against the (so called) full URL, we have
* to re-add the PATH_INFO postfix
*/
if (r->path_info && *r->path_info) {
rewritelog((r, 3, ctx->perdir, "add path info postfix: %s -> %s%s",
ctx->uri, ctx->uri, r->path_info));
ctx->uri = apr_pstrcat(r->pool, ctx->uri, r->path_info, NULL);
}
/* Additionally we strip the physical path from the url to match
* it independent from the underlaying filesystem.
*/
if (!is_proxyreq && strlen(ctx->uri) >= dirlen &&
!strncmp(ctx->uri, ctx->perdir, dirlen)) {
rewritelog((r, 3, ctx->perdir, "strip per-dir prefix: %s -> %s",
ctx->uri, ctx->uri + dirlen));
ctx->uri = ctx->uri + dirlen;
}
}
/* Try to match the URI against the RewriteRule pattern
* and exit immediately if it didn't apply.
*/
rewritelog((r, 3, ctx->perdir, "applying pattern '%s' to uri '%s'",
p->pattern, ctx->uri));
rc = !ap_regexec(p->regexp, ctx->uri, AP_MAX_REG_MATCH, regmatch, 0);
if (! (( rc && !(p->flags & RULEFLAG_NOTMATCH)) ||
(!rc && (p->flags & RULEFLAG_NOTMATCH)) ) ) {
return 0;
}
/* It matched, wow! Now it's time to prepare the context structure for
* further processing
*/
ctx->vary_this = NULL;
ctx->briRC.source = NULL;
if (p->flags & RULEFLAG_NOTMATCH) {
ctx->briRR.source = NULL;
}
else {
ctx->briRR.source = apr_pstrdup(r->pool, ctx->uri);
ctx->briRR.nsub = p->regexp->re_nsub;
memcpy(ctx->briRR.regmatch, regmatch, sizeof(regmatch));
}
/* Ok, we already know the pattern has matched, but we now
* additionally have to check for all existing preconditions
* (RewriteCond) which have to be also true. We do this at
* this very late stage to avoid unnessesary checks which
* would slow down the rewriting engine.
*/
rewriteconds = p->rewriteconds;
conds = (rewritecond_entry *)rewriteconds->elts;
for (i = 0; i < rewriteconds->nelts; ++i) {
rewritecond_entry *c = &conds[i];
rc = apply_rewrite_cond(c, ctx);
/*
* Reset vary_this if the novary flag is set for this condition.
*/
if (c->flags & CONDFLAG_NOVARY) {
ctx->vary_this = NULL;
}
if (c->flags & CONDFLAG_ORNEXT) {
if (!rc) {
/* One condition is false, but another can be still true. */
ctx->vary_this = NULL;
continue;
}
else {
/* skip the rest of the chained OR conditions */
while ( i < rewriteconds->nelts
&& c->flags & CONDFLAG_ORNEXT) {
c = &conds[++i];
}
}
}
else if (!rc) {
return 0;
}
/* If some HTTP header was involved in the condition, remember it
* for later use
*/
if (ctx->vary_this) {
ctx->vary = ctx->vary
? apr_pstrcat(r->pool, ctx->vary, ", ", ctx->vary_this,
NULL)
: ctx->vary_this;
ctx->vary_this = NULL;
}
}
/* expand the result */
if (!(p->flags & RULEFLAG_NOSUB)) {
newuri = do_expand(p->output, ctx, p);
rewritelog((r, 2, ctx->perdir, "rewrite '%s' -> '%s'", ctx->uri,
newuri));
}
/* expand [E=var:val] and [CO=<cookie>] */
do_expand_env(p->env, ctx);
do_expand_cookie(p->cookie, ctx);
/* non-substitution rules ('RewriteRule <pat> -') end here. */
if (p->flags & RULEFLAG_NOSUB) {
force_type_handler(p, ctx);
if (p->flags & RULEFLAG_STATUS) {
rewritelog((r, 2, ctx->perdir, "forcing responsecode %d for %s",
p->forced_responsecode, r->filename));
r->status = p->forced_responsecode;
}
return 2;
}
/* Now adjust API's knowledge about r->filename and r->args */
r->filename = newuri;
splitout_queryargs(r, p->flags & RULEFLAG_QSAPPEND);
/* Add the previously stripped per-directory location prefix, unless
* (1) it's an absolute URL path and
* (2) it's a full qualified URL
*/
if ( ctx->perdir && !is_proxyreq && *r->filename != '/'
&& !is_absolute_uri(r->filename)) {
rewritelog((r, 3, ctx->perdir, "add per-dir prefix: %s -> %s%s",
r->filename, ctx->perdir, r->filename));
r->filename = apr_pstrcat(r->pool, ctx->perdir, r->filename, NULL);
}
/* If this rule is forced for proxy throughput
* (`RewriteRule ... ... [P]') then emulate mod_proxy's
* URL-to-filename handler to be sure mod_proxy is triggered
* for this URL later in the Apache API. But make sure it is
* a fully-qualified URL. (If not it is qualified with
* ourself).
*/
if (p->flags & RULEFLAG_PROXY) {
/* PR#39746: Escaping things here gets repeated in mod_proxy */
fully_qualify_uri(r);
rewritelog((r, 2, ctx->perdir, "forcing proxy-throughput with %s",
r->filename));
r->filename = apr_pstrcat(r->pool, "proxy:", r->filename, NULL);
return 1;
}
/* If this rule is explicitly forced for HTTP redirection
* (`RewriteRule .. .. [R]') then force an external HTTP
* redirect. But make sure it is a fully-qualified URL. (If
* not it is qualified with ourself).
*/
if (p->flags & RULEFLAG_FORCEREDIRECT) {
fully_qualify_uri(r);
rewritelog((r, 2, ctx->perdir, "explicitly forcing redirect with %s",
r->filename));
r->status = p->forced_responsecode;
return 1;
}
/* Special Rewriting Feature: Self-Reduction
* We reduce the URL by stripping a possible
* http[s]://<ourhost>[:<port>] prefix, i.e. a prefix which
* corresponds to ourself. This is to simplify rewrite maps
* and to avoid recursion, etc. When this prefix is not a
* coincidence then the user has to use [R] explicitly (see
* above).
*/
reduce_uri(r);
/* If this rule is still implicitly forced for HTTP
* redirection (`RewriteRule .. <scheme>://...') then
* directly force an external HTTP redirect.
*/
if (is_absolute_uri(r->filename)) {
rewritelog((r, 2, ctx->perdir, "implicitly forcing redirect (rc=%d) "
"with %s", p->forced_responsecode, r->filename));
r->status = p->forced_responsecode;
return 1;
}
/* Finally remember the forced mime-type */
force_type_handler(p, ctx);
/* Puuhhhhhhhh... WHAT COMPLICATED STUFF ;_)
* But now we're done for this particular rule.
*/
return 1;
}
/*
* Apply a complete rule set,
* i.e. a list of rewrite rules
*/
static int apply_rewrite_list(request_rec *r, apr_array_header_t *rewriterules,
char *perdir)
{
rewriterule_entry *entries;
rewriterule_entry *p;
int i;
int changed;
int rc;
int s;
rewrite_ctx *ctx;
ctx = apr_palloc(r->pool, sizeof(*ctx));
ctx->perdir = perdir;
ctx->r = r;
/*
* Iterate over all existing rules
*/
entries = (rewriterule_entry *)rewriterules->elts;
changed = 0;
loop:
for (i = 0; i < rewriterules->nelts; i++) {
p = &entries[i];
/*
* Ignore this rule on subrequests if we are explicitly
* asked to do so or this is a proxy-throughput or a
* forced redirect rule.
*/
if (r->main != NULL &&
(p->flags & RULEFLAG_IGNOREONSUBREQ ||
p->flags & RULEFLAG_FORCEREDIRECT )) {
continue;
}
/*
* Apply the current rule.
*/
ctx->vary = NULL;
rc = apply_rewrite_rule(p, ctx);
if (rc) {
/* Regardless of what we do next, we've found a match. Check to see
* if any of the request header fields were involved, and add them
* to the Vary field of the response.
*/
if (ctx->vary) {
apr_table_merge(r->headers_out, "Vary", ctx->vary);
}
/*
* The rule sets the response code (implies match-only)
*/
if (p->flags & RULEFLAG_STATUS) {
return ACTION_STATUS;
}
/*
* Indicate a change if this was not a match-only rule.
*/
if (rc != 2) {
changed = ((p->flags & RULEFLAG_NOESCAPE)
? ACTION_NOESCAPE : ACTION_NORMAL);
}
/*
* Pass-Through Feature (`RewriteRule .. .. [PT]'):
* Because the Apache 1.x API is very limited we
* need this hack to pass the rewritten URL to other
* modules like mod_alias, mod_userdir, etc.
*/
if (p->flags & RULEFLAG_PASSTHROUGH) {
rewritelog((r, 2, perdir, "forcing '%s' to get passed through "
"to next API URI-to-filename handler", r->filename));
r->filename = apr_pstrcat(r->pool, "passthrough:",
r->filename, NULL);
changed = ACTION_NORMAL;
break;
}
/*
* Stop processing also on proxy pass-through and
* last-rule and new-round flags.
*/
if (p->flags & (RULEFLAG_PROXY | RULEFLAG_LASTRULE)) {
break;
}
/*
* On "new-round" flag we just start from the top of
* the rewriting ruleset again.
*/
if (p->flags & RULEFLAG_NEWROUND) {
goto loop;
}
/*
* If we are forced to skip N next rules, do it now.
*/
if (p->skip > 0) {
s = p->skip;
while ( i < rewriterules->nelts
&& s > 0) {
i++;
p = &entries[i];
s--;
}
}
}
else {
/*
* If current rule is chained with next rule(s),
* skip all this next rule(s)
*/
while ( i < rewriterules->nelts
&& p->flags & RULEFLAG_CHAIN) {
i++;
p = &entries[i];
}
}
}
return changed;
}
/*
* +-------------------------------------------------------+
* | |
* | Module Initialization Hooks
* | |
* +-------------------------------------------------------+
*/
static int pre_config(apr_pool_t *pconf,
apr_pool_t *plog,
apr_pool_t *ptemp)
{
APR_OPTIONAL_FN_TYPE(ap_register_rewrite_mapfunc) *map_pfn_register;
/* register int: rewritemap handlers */
map_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_rewrite_mapfunc);
if (map_pfn_register) {
map_pfn_register("tolower", rewrite_mapfunc_tolower);
map_pfn_register("toupper", rewrite_mapfunc_toupper);
map_pfn_register("escape", rewrite_mapfunc_escape);
map_pfn_register("unescape", rewrite_mapfunc_unescape);
}
dbd_acquire = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_acquire);
dbd_prepare = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_prepare);
return OK;
}
static int post_config(apr_pool_t *p,
apr_pool_t *plog,
apr_pool_t *ptemp,
server_rec *s)
{
apr_status_t rv;
void *data;
int first_time = 0;
const char *userdata_key = "rewrite_init_module";
apr_pool_userdata_get(&data, userdata_key, s->process->pool);
if (!data) {
first_time = 1;
apr_pool_userdata_set((const void *)1, userdata_key,
apr_pool_cleanup_null, s->process->pool);
}
/* check if proxy module is available */
proxy_available = (ap_find_linked_module("mod_proxy.c") != NULL);
#ifndef REWRITELOG_DISABLED
/* create the rewriting lockfiles in the parent */
if ((rv = apr_global_mutex_create(&rewrite_log_lock, NULL,
APR_LOCK_DEFAULT, p)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"mod_rewrite: could not create rewrite_log_lock");
return HTTP_INTERNAL_SERVER_ERROR;
}
#ifdef AP_NEED_SET_MUTEX_PERMS
rv = ap_unixd_set_global_mutex_perms(rewrite_log_lock);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"mod_rewrite: Could not set permissions on "
"rewrite_log_lock; check User and Group directives");
return HTTP_INTERNAL_SERVER_ERROR;
}
#endif /* perms */
#endif /* rewritelog */
rv = rewritelock_create(s, p);
if (rv != APR_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
}
apr_pool_cleanup_register(p, (void *)s, rewritelock_remove,
apr_pool_cleanup_null);
/* step through the servers and
* - open each rewriting logfile
* - open the RewriteMap prg:xxx programs
*/
for (; s; s = s->next) {
#ifndef REWRITELOG_DISABLED
if (!open_rewritelog(s, p)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
#endif
if (!first_time) {
if (run_rewritemap_programs(s, p) != APR_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
}
}
}
rewrite_ssl_lookup = APR_RETRIEVE_OPTIONAL_FN(ssl_var_lookup);
rewrite_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
return OK;
}
static void init_child(apr_pool_t *p, server_rec *s)
{
apr_status_t rv = 0; /* get a rid of gcc warning (REWRITELOG_DISABLED) */
if (lockname != NULL && *(lockname) != '\0') {
rv = apr_global_mutex_child_init(&rewrite_mapr_lock_acquire,
lockname, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"mod_rewrite: could not init rewrite_mapr_lock_acquire"
" in child");
}
}
#ifndef REWRITELOG_DISABLED
rv = apr_global_mutex_child_init(&rewrite_log_lock, NULL, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"mod_rewrite: could not init rewrite log lock in child");
}
#endif
/* create the lookup cache */
if (!init_cache(p)) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"mod_rewrite: could not init map cache in child");
}
}
/*
* +-------------------------------------------------------+
* | |
* | runtime hooks
* | |
* +-------------------------------------------------------+
*/
/*
* URI-to-filename hook
* [deals with RewriteRules in server context]
*/
static int hook_uri2file(request_rec *r)
{
rewrite_server_conf *conf;
const char *saved_rulestatus;
const char *var;
const char *thisserver;
char *thisport;
const char *thisurl;
unsigned int port;
int rulestatus;
/*
* retrieve the config structures
*/
conf = ap_get_module_config(r->server->module_config, &rewrite_module);
/*
* only do something under runtime if the engine is really enabled,
* else return immediately!
*/
if (conf->state == ENGINE_DISABLED) {
return DECLINED;
}
/*
* check for the ugly API case of a virtual host section where no
* mod_rewrite directives exists. In this situation we became no chance
* by the API to setup our default per-server config so we have to
* on-the-fly assume we have the default config. But because the default
* config has a disabled rewriting engine we are lucky because can
* just stop operating now.
*/
if (conf->server != r->server) {
return DECLINED;
}
/*
* add the SCRIPT_URL variable to the env. this is a bit complicated
* due to the fact that apache uses subrequests and internal redirects
*/
if (r->main == NULL) {
var = apr_table_get(r->subprocess_env, REDIRECT_ENVVAR_SCRIPT_URL);
if (var == NULL) {
apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URL, r->uri);
}
else {
apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URL, var);
}
}
else {
var = apr_table_get(r->main->subprocess_env, ENVVAR_SCRIPT_URL);
apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URL, var);
}
/*
* create the SCRIPT_URI variable for the env
*/
/* add the canonical URI of this URL */
thisserver = ap_get_server_name(r);
port = ap_get_server_port(r);
if (ap_is_default_port(port, r)) {
thisport = "";
}
else {
thisport = apr_psprintf(r->pool, ":%u", port);
}
thisurl = apr_table_get(r->subprocess_env, ENVVAR_SCRIPT_URL);
/* set the variable */
var = apr_pstrcat(r->pool, ap_http_scheme(r), "://", thisserver, thisport,
thisurl, NULL);
apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URI, var);
if (!(saved_rulestatus = apr_table_get(r->notes,"mod_rewrite_rewritten"))) {
/* if filename was not initially set,
* we start with the requested URI
*/
if (r->filename == NULL) {
r->filename = apr_pstrdup(r->pool, r->uri);
rewritelog((r, 2, NULL, "init rewrite engine with requested uri %s",
r->filename));
}
else {
rewritelog((r, 2, NULL, "init rewrite engine with passed filename "
"%s. Original uri = %s", r->filename, r->uri));
}
/*
* now apply the rules ...
*/
rulestatus = apply_rewrite_list(r, conf->rewriterules, NULL);
apr_table_set(r->notes,"mod_rewrite_rewritten",
apr_psprintf(r->pool,"%d",rulestatus));
}
else {
rewritelog((r, 2, NULL, "uri already rewritten. Status %s, Uri %s, "
"r->filename %s", saved_rulestatus, r->uri, r->filename));
rulestatus = atoi(saved_rulestatus);
}
if (rulestatus) {
unsigned skip;
apr_size_t flen;
if (ACTION_STATUS == rulestatus) {
int n = r->status;
r->status = HTTP_OK;
return n;
}
flen = r->filename ? strlen(r->filename) : 0;
if (flen > 6 && strncmp(r->filename, "proxy:", 6) == 0) {
/* it should be go on as an internal proxy request */
/* check if the proxy module is enabled, so
* we can actually use it!
*/
if (!proxy_available) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"attempt to make remote request from mod_rewrite "
"without proxy enabled: %s", r->filename);
return HTTP_FORBIDDEN;
}
if (rulestatus == ACTION_NOESCAPE) {
apr_table_setn(r->notes, "proxy-nocanon", "1");
}
/* make sure the QUERY_STRING and
* PATH_INFO parts get incorporated
*/
if (r->path_info != NULL) {
r->filename = apr_pstrcat(r->pool, r->filename,
r->path_info, NULL);
}
if ((r->args != NULL)
&& ((r->proxyreq == PROXYREQ_PROXY)
|| (rulestatus == ACTION_NOESCAPE))) {
/* see proxy_http:proxy_http_canon() */
r->filename = apr_pstrcat(r->pool, r->filename,
"?", r->args, NULL);
}
/* now make sure the request gets handled by the proxy handler */
if (PROXYREQ_NONE == r->proxyreq) {
r->proxyreq = PROXYREQ_REVERSE;
}
r->handler = "proxy-server";
rewritelog((r, 1, NULL, "go-ahead with proxy request %s [OK]",
r->filename));
return OK;
}
else if ((skip = is_absolute_uri(r->filename)) > 0) {
int n;
/* it was finally rewritten to a remote URL */
if (rulestatus != ACTION_NOESCAPE) {
rewritelog((r, 1, NULL, "escaping %s for redirect",
r->filename));
r->filename = escape_absolute_uri(r->pool, r->filename, skip);
}
/* append the QUERY_STRING part */
if (r->args) {
r->filename = apr_pstrcat(r->pool, r->filename, "?",
(rulestatus == ACTION_NOESCAPE)
? r->args
: ap_escape_uri(r->pool, r->args),
NULL);
}
/* determine HTTP redirect response code */
if (ap_is_HTTP_REDIRECT(r->status)) {
n = r->status;
r->status = HTTP_OK; /* make Apache kernel happy */
}
else {
n = HTTP_MOVED_TEMPORARILY;
}
/* now do the redirection */
apr_table_setn(r->headers_out, "Location", r->filename);
rewritelog((r, 1, NULL, "redirect to %s [REDIRECT/%d]", r->filename,
n));
return n;
}
else if (flen > 12 && strncmp(r->filename, "passthrough:", 12) == 0) {
/*
* Hack because of underpowered API: passing the current
* rewritten filename through to other URL-to-filename handlers
* just as it were the requested URL. This is to enable
* post-processing by mod_alias, etc. which always act on
* r->uri! The difference here is: We do not try to
* add the document root
*/
r->uri = apr_pstrdup(r->pool, r->filename+12);
return DECLINED;
}
else {
/* it was finally rewritten to a local path */
/* expand "/~user" prefix */
#if APR_HAS_USER
r->filename = expand_tildepaths(r, r->filename);
#endif
rewritelog((r, 2, NULL, "local path result: %s", r->filename));
/* the filename must be either an absolute local path or an
* absolute local URL.
*/
if ( *r->filename != '/'
&& !ap_os_is_path_absolute(r->pool, r->filename)) {
return HTTP_BAD_REQUEST;
}
/* if there is no valid prefix, we call
* the translator from the core and
* prefix the filename with document_root
*
* NOTICE:
* We cannot leave out the prefix_stat because
* - when we always prefix with document_root
* then no absolute path can be created, e.g. via
* emulating a ScriptAlias directive, etc.
* - when we always NOT prefix with document_root
* then the files under document_root have to
* be references directly and document_root
* gets never used and will be a dummy parameter -
* this is also bad
*
* BUT:
* Under real Unix systems this is no problem,
* because we only do stat() on the first directory
* and this gets cached by the kernel for along time!
*/
if (!prefix_stat(r->filename, r->pool)) {
int res;
char *tmp = r->uri;
r->uri = r->filename;
res = ap_core_translate(r);
r->uri = tmp;
if (res != OK) {
rewritelog((r, 1, NULL, "prefixing with document_root of %s"
" FAILED", r->filename));
return res;
}
rewritelog((r, 2, NULL, "prefixed with document_root to %s",
r->filename));
}
rewritelog((r, 1, NULL, "go-ahead with %s [OK]", r->filename));
return OK;
}
}
else {
rewritelog((r, 1, NULL, "pass through %s", r->filename));
return DECLINED;
}
}
/*
* Fixup hook
* [RewriteRules in directory context]
*/
static int hook_fixup(request_rec *r)
{
rewrite_perdir_conf *dconf;
char *cp;
char *cp2;
const char *ccp;
apr_size_t l;
int rulestatus;
int n;
char *ofilename;
int is_proxyreq;
dconf = (rewrite_perdir_conf *)ap_get_module_config(r->per_dir_config,
&rewrite_module);
/* if there is no per-dir config we return immediately */
if (dconf == NULL) {
return DECLINED;
}
/* if there are no real (i.e. no RewriteRule directives!)
per-dir config of us, we return also immediately */
if (dconf->directory == NULL) {
return DECLINED;
}
/*
* Proxy request?
*/
is_proxyreq = ( r->proxyreq && r->filename
&& !strncmp(r->filename, "proxy:", 6));
/*
* .htaccess file is called before really entering the directory, i.e.:
* URL: http://localhost/foo and .htaccess is located in foo directory
* Ignore such attempts, since they may lead to undefined behaviour.
*/
if (!is_proxyreq) {
l = strlen(dconf->directory) - 1;
if (r->filename && strlen(r->filename) == l &&
(dconf->directory)[l] == '/' &&
!strncmp(r->filename, dconf->directory, l)) {
return DECLINED;
}
}
/*
* only do something under runtime if the engine is really enabled,
* for this directory, else return immediately!
*/
if (dconf->state == ENGINE_DISABLED) {
return DECLINED;
}
/*
* Do the Options check after engine check, so
* the user is able to explicitely turn RewriteEngine Off.
*/
if (!(ap_allow_options(r) & (OPT_SYM_LINKS | OPT_SYM_OWNER))) {
/* FollowSymLinks is mandatory! */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Options FollowSymLinks or SymLinksIfOwnerMatch is off "
"which implies that RewriteRule directive is forbidden: "
"%s", r->filename);
return HTTP_FORBIDDEN;
}
/*
* remember the current filename before rewriting for later check
* to prevent deadlooping because of internal redirects
* on final URL/filename which can be equal to the inital one.
* also, we'll restore original r->filename if we decline this
* request
*/
ofilename = r->filename;
if (r->filename == NULL) {
r->filename = apr_pstrdup(r->pool, r->uri);
rewritelog((r, 2, dconf->directory, "init rewrite engine with"
" requested uri %s", r->filename));
}
/*
* now apply the rules ...
*/
rulestatus = apply_rewrite_list(r, dconf->rewriterules, dconf->directory);
if (rulestatus) {
unsigned skip;
if (ACTION_STATUS == rulestatus) {
int n = r->status;
r->status = HTTP_OK;
return n;
}
l = strlen(r->filename);
if (l > 6 && strncmp(r->filename, "proxy:", 6) == 0) {
/* it should go on as an internal proxy request */
/* make sure the QUERY_STRING and
* PATH_INFO parts get incorporated
* (r->path_info was already appended by the
* rewriting engine because of the per-dir context!)
*/
if (r->args != NULL) {
r->filename = apr_pstrcat(r->pool, r->filename,
"?", r->args, NULL);
}
/* now make sure the request gets handled by the proxy handler */
if (PROXYREQ_NONE == r->proxyreq) {
r->proxyreq = PROXYREQ_REVERSE;
}
r->handler = "proxy-server";
rewritelog((r, 1, dconf->directory, "go-ahead with proxy request "
"%s [OK]", r->filename));
return OK;
}
else if ((skip = is_absolute_uri(r->filename)) > 0) {
/* it was finally rewritten to a remote URL */
/* because we are in a per-dir context
* first try to replace the directory with its base-URL
* if there is a base-URL available
*/
if (dconf->baseurl != NULL) {
/* skip 'scheme://' */
cp = r->filename + skip;
if ((cp = ap_strchr(cp, '/')) != NULL && *(++cp)) {
rewritelog((r, 2, dconf->directory,
"trying to replace prefix %s with %s",
dconf->directory, dconf->baseurl));
/* I think, that hack needs an explanation:
* well, here is it:
* mod_rewrite was written for unix systems, were
* absolute file-system paths start with a slash.
* URL-paths _also_ start with slashes, so they
* can be easily compared with system paths.
*
* the following assumes, that the actual url-path
* may be prefixed by the current directory path and
* tries to replace the system path with the RewriteBase
* URL.
* That assumption is true if we use a RewriteRule like
*
* RewriteRule ^foo bar [R]
*
* (see apply_rewrite_rule function)
* However on systems that don't have a / as system
* root this will never match, so we skip the / after the
* hostname and compare/substitute only the stuff after it.
*
* (note that cp was already increased to the right value)
*/
cp2 = subst_prefix_path(r, cp, (*dconf->directory == '/')
? dconf->directory + 1
: dconf->directory,
dconf->baseurl + 1);
if (strcmp(cp2, cp) != 0) {
*cp = '\0';
r->filename = apr_pstrcat(r->pool, r->filename,
cp2, NULL);
}
}
}
/* now prepare the redirect... */
if (rulestatus != ACTION_NOESCAPE) {
rewritelog((r, 1, dconf->directory, "escaping %s for redirect",
r->filename));
r->filename = escape_absolute_uri(r->pool, r->filename, skip);
}
/* append the QUERY_STRING part */
if (r->args) {
r->filename = apr_pstrcat(r->pool, r->filename, "?",
(rulestatus == ACTION_NOESCAPE)
? r->args
: ap_escape_uri(r->pool, r->args),
NULL);
}
/* determine HTTP redirect response code */
if (ap_is_HTTP_REDIRECT(r->status)) {
n = r->status;
r->status = HTTP_OK; /* make Apache kernel happy */
}
else {
n = HTTP_MOVED_TEMPORARILY;
}
/* now do the redirection */
apr_table_setn(r->headers_out, "Location", r->filename);
rewritelog((r, 1, dconf->directory, "redirect to %s [REDIRECT/%d]",
r->filename, n));
return n;
}
else {
/* it was finally rewritten to a local path */
/* if someone used the PASSTHROUGH flag in per-dir
* context we just ignore it. It is only useful
* in per-server context
*/
if (l > 12 && strncmp(r->filename, "passthrough:", 12) == 0) {
r->filename = apr_pstrdup(r->pool, r->filename+12);
}
/* the filename must be either an absolute local path or an
* absolute local URL.
*/
if ( *r->filename != '/'
&& !ap_os_is_path_absolute(r->pool, r->filename)) {
return HTTP_BAD_REQUEST;
}
/* Check for deadlooping:
* At this point we KNOW that at least one rewriting
* rule was applied, but when the resulting URL is
* the same as the initial URL, we are not allowed to
* use the following internal redirection stuff because
* this would lead to a deadloop.
*/
if (ofilename != NULL && strcmp(r->filename, ofilename) == 0) {
rewritelog((r, 1, dconf->directory, "initial URL equal rewritten"
" URL: %s [IGNORING REWRITE]", r->filename));
return OK;
}
/* if there is a valid base-URL then substitute
* the per-dir prefix with this base-URL if the
* current filename still is inside this per-dir
* context. If not then treat the result as a
* plain URL
*/
if (dconf->baseurl != NULL) {
rewritelog((r, 2, dconf->directory, "trying to replace prefix "
"%s with %s", dconf->directory, dconf->baseurl));
r->filename = subst_prefix_path(r, r->filename,
dconf->directory,
dconf->baseurl);
}
else {
/* if no explicit base-URL exists we assume
* that the directory prefix is also a valid URL
* for this webserver and only try to remove the
* document_root if it is prefix
*/
if ((ccp = ap_document_root(r)) != NULL) {
/* strip trailing slash */
l = strlen(ccp);
if (ccp[l-1] == '/') {
--l;
}
if (!strncmp(r->filename, ccp, l) &&
r->filename[l] == '/') {
rewritelog((r, 2,dconf->directory, "strip document_root"
" prefix: %s -> %s", r->filename,
r->filename+l));
r->filename = apr_pstrdup(r->pool, r->filename+l);
}
}
}
/* now initiate the internal redirect */
rewritelog((r, 1, dconf->directory, "internal redirect with %s "
"[INTERNAL REDIRECT]", r->filename));
r->filename = apr_pstrcat(r->pool, "redirect:", r->filename, NULL);
r->handler = "redirect-handler";
return OK;
}
}
else {
rewritelog((r, 1, dconf->directory, "pass through %s", r->filename));
r->filename = ofilename;
return DECLINED;
}
}
/*
* MIME-type hook
* [T=...,H=...] execution
*/
static int hook_mimetype(request_rec *r)
{
const char *t;
/* type */
t = apr_table_get(r->notes, REWRITE_FORCED_MIMETYPE_NOTEVAR);
if (t && *t) {
rewritelog((r, 1, NULL, "force filename %s to have MIME-type '%s'",
r->filename, t));
ap_set_content_type(r, t);
}
/* handler */
t = apr_table_get(r->notes, REWRITE_FORCED_HANDLER_NOTEVAR);
if (t && *t) {
rewritelog((r, 1, NULL, "force filename %s to have the "
"Content-handler '%s'", r->filename, t));
r->handler = t;
}
return OK;
}
/*
* "content" handler for internal redirects
*/
static int handler_redirect(request_rec *r)
{
if (strcmp(r->handler, "redirect-handler")) {
return DECLINED;
}
/* just make sure that we are really meant! */
if (strncmp(r->filename, "redirect:", 9) != 0) {
return DECLINED;
}
/* now do the internal redirect */
ap_internal_redirect(apr_pstrcat(r->pool, r->filename+9,
r->args ? "?" : NULL, r->args, NULL), r);
/* and return gracefully */
return OK;
}
/*
* +-------------------------------------------------------+
* | |
* | Module paraphernalia
* | |
* +-------------------------------------------------------+
*/
#ifdef REWRITELOG_DISABLED
static const char *fake_rewritelog(cmd_parms *cmd, void *dummy, const char *a1)
{
return "RewriteLog and RewriteLogLevel are not supported by this build "
"of mod_rewrite because it was compiled using the "
"-DREWRITELOG_DISABLED compiler option. You have to recompile "
"mod_rewrite WITHOUT this option in order to use the rewrite log.";
}
#endif
static const command_rec command_table[] = {
AP_INIT_FLAG( "RewriteEngine", cmd_rewriteengine, NULL, OR_FILEINFO,
"On or Off to enable or disable (default) the whole "
"rewriting engine"),
AP_INIT_ITERATE( "RewriteOptions", cmd_rewriteoptions, NULL, OR_FILEINFO,
"List of option strings to set"),
AP_INIT_TAKE1( "RewriteBase", cmd_rewritebase, NULL, OR_FILEINFO,
"the base URL of the per-directory context"),
AP_INIT_RAW_ARGS("RewriteCond", cmd_rewritecond, NULL, OR_FILEINFO,
"an input string and a to be applied regexp-pattern"),
AP_INIT_RAW_ARGS("RewriteRule", cmd_rewriterule, NULL, OR_FILEINFO,
"an URL-applied regexp-pattern and a substitution URL"),
AP_INIT_TAKE2( "RewriteMap", cmd_rewritemap, NULL, RSRC_CONF,
"a mapname and a filename"),
AP_INIT_TAKE1( "RewriteLock", cmd_rewritelock, NULL, RSRC_CONF,
"the filename of a lockfile used for inter-process "
"synchronization"),
#ifndef REWRITELOG_DISABLED
AP_INIT_TAKE1( "RewriteLog", cmd_rewritelog, NULL, RSRC_CONF,
"the filename of the rewriting logfile"),
AP_INIT_TAKE1( "RewriteLogLevel", cmd_rewriteloglevel, NULL, RSRC_CONF,
"the level of the rewriting logfile verbosity "
"(0=none, 1=std, .., 9=max)"),
#else
AP_INIT_TAKE1( "RewriteLog", fake_rewritelog, NULL, RSRC_CONF,
"[DISABLED] the filename of the rewriting logfile"),
AP_INIT_TAKE1( "RewriteLogLevel", fake_rewritelog, NULL, RSRC_CONF,
"[DISABLED] the level of the rewriting logfile verbosity"),
#endif
{ NULL }
};
static void ap_register_rewrite_mapfunc(char *name, rewrite_mapfunc_t *func)
{
apr_hash_set(mapfunc_hash, name, strlen(name), (const void *)func);
}
static void register_hooks(apr_pool_t *p)
{
/* fixup after mod_proxy, so that the proxied url will not
* escaped accidentally by mod_proxy's fixup.
*/
static const char * const aszPre[]={ "mod_proxy.c", NULL };
/* make the hashtable before registering the function, so that
* other modules are prevented from accessing uninitialized memory.
*/
mapfunc_hash = apr_hash_make(p);
APR_REGISTER_OPTIONAL_FN(ap_register_rewrite_mapfunc);
ap_hook_handler(handler_redirect, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_pre_config(pre_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_post_config(post_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_child_init(init_child, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_fixups(hook_fixup, aszPre, NULL, APR_HOOK_FIRST);
ap_hook_fixups(hook_mimetype, NULL, NULL, APR_HOOK_LAST);
ap_hook_translate_name(hook_uri2file, NULL, NULL, APR_HOOK_FIRST);
}
/* the main config structure */
module AP_MODULE_DECLARE_DATA rewrite_module = {
STANDARD20_MODULE_STUFF,
config_perdir_create, /* create per-dir config structures */
config_perdir_merge, /* merge per-dir config structures */
config_server_create, /* create per-server config structures */
config_server_merge, /* merge per-server config structures */
command_table, /* table of config file commands */
register_hooks /* register hooks */
};
/*EOF*/