| /* Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed 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. |
| */ |
| |
| /* |
| * http_alias.c: Stuff for dealing with directory aliases |
| * |
| * Original by Rob McCool, rewritten in succession by David Robinson |
| * and rst. |
| * |
| */ |
| |
| #include "apr_strings.h" |
| #include "apr_lib.h" |
| |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_core.h" |
| #include "http_config.h" |
| #include "http_request.h" |
| #include "http_log.h" |
| |
| |
| typedef struct { |
| const char *real; |
| const char *fake; |
| char *handler; |
| regex_t *regexp; |
| int redir_status; /* 301, 302, 303, 410, etc */ |
| } alias_entry; |
| |
| typedef struct { |
| apr_array_header_t *aliases; |
| apr_array_header_t *redirects; |
| } alias_server_conf; |
| |
| typedef struct { |
| apr_array_header_t *redirects; |
| } alias_dir_conf; |
| |
| module AP_MODULE_DECLARE_DATA alias_module; |
| |
| static void *create_alias_config(apr_pool_t *p, server_rec *s) |
| { |
| alias_server_conf *a = |
| (alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf)); |
| |
| a->aliases = apr_array_make(p, 20, sizeof(alias_entry)); |
| a->redirects = apr_array_make(p, 20, sizeof(alias_entry)); |
| return a; |
| } |
| |
| static void *create_alias_dir_config(apr_pool_t *p, char *d) |
| { |
| alias_dir_conf *a = |
| (alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf)); |
| a->redirects = apr_array_make(p, 2, sizeof(alias_entry)); |
| return a; |
| } |
| |
| static void *merge_alias_config(apr_pool_t *p, void *basev, void *overridesv) |
| { |
| alias_server_conf *a = |
| (alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf)); |
| alias_server_conf *base = (alias_server_conf *) basev; |
| alias_server_conf *overrides = (alias_server_conf *) overridesv; |
| |
| a->aliases = apr_array_append(p, overrides->aliases, base->aliases); |
| a->redirects = apr_array_append(p, overrides->redirects, base->redirects); |
| return a; |
| } |
| |
| static void *merge_alias_dir_config(apr_pool_t *p, void *basev, void *overridesv) |
| { |
| alias_dir_conf *a = |
| (alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf)); |
| alias_dir_conf *base = (alias_dir_conf *) basev; |
| alias_dir_conf *overrides = (alias_dir_conf *) overridesv; |
| a->redirects = apr_array_append(p, overrides->redirects, base->redirects); |
| return a; |
| } |
| |
| /* need prototype for overlap check */ |
| static int alias_matches(const char *uri, const char *alias_fakename); |
| |
| static const char *add_alias_internal(cmd_parms *cmd, void *dummy, |
| const char *f, const char *r, |
| int use_regex) |
| { |
| server_rec *s = cmd->server; |
| alias_server_conf *conf = ap_get_module_config(s->module_config, |
| &alias_module); |
| alias_entry *new = apr_array_push(conf->aliases); |
| alias_entry *entries = (alias_entry *)conf->aliases->elts; |
| int i; |
| |
| /* XX r can NOT be relative to DocumentRoot here... compat bug. */ |
| |
| if (use_regex) { |
| new->regexp = ap_pregcomp(cmd->pool, f, REG_EXTENDED); |
| if (new->regexp == NULL) |
| return "Regular expression could not be compiled."; |
| new->real = r; |
| } |
| else { |
| /* XXX This may be optimized, but we must know that new->real |
| * exists. If so, we can dir merge later, trusing new->real |
| * and just canonicalizing the remainder. Not till I finish |
| * cleaning out the old ap_canonical stuff first. |
| */ |
| new->real = r; |
| } |
| new->fake = f; |
| new->handler = cmd->info; |
| |
| /* check for overlapping (Script)Alias directives |
| * and throw a warning if found one |
| */ |
| if (!use_regex) { |
| for (i = 0; i < conf->aliases->nelts - 1; ++i) { |
| alias_entry *p = &entries[i]; |
| |
| if ( (!p->regexp && alias_matches(f, p->fake) > 0) |
| || (p->regexp && !ap_regexec(p->regexp, f, 0, NULL, 0))) { |
| ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server, |
| "The %s directive in %s at line %d will probably " |
| "never match because it overlaps an earlier " |
| "%sAlias%s.", |
| cmd->cmd->name, cmd->directive->filename, |
| cmd->directive->line_num, |
| p->handler ? "Script" : "", |
| p->regexp ? "Match" : ""); |
| |
| break; /* one warning per alias should be sufficient */ |
| } |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static const char *add_alias(cmd_parms *cmd, void *dummy, const char *f, |
| const char *r) |
| { |
| return add_alias_internal(cmd, dummy, f, r, 0); |
| } |
| |
| static const char *add_alias_regex(cmd_parms *cmd, void *dummy, const char *f, |
| const char *r) |
| { |
| return add_alias_internal(cmd, dummy, f, r, 1); |
| } |
| |
| static const char *add_redirect_internal(cmd_parms *cmd, |
| alias_dir_conf *dirconf, |
| const char *arg1, const char *arg2, |
| const char *arg3, int use_regex) |
| { |
| alias_entry *new; |
| server_rec *s = cmd->server; |
| alias_server_conf *serverconf = ap_get_module_config(s->module_config, |
| &alias_module); |
| int status = (int) (long) cmd->info; |
| regex_t *r = NULL; |
| const char *f = arg2; |
| const char *url = arg3; |
| |
| if (!strcasecmp(arg1, "gone")) |
| status = HTTP_GONE; |
| else if (!strcasecmp(arg1, "permanent")) |
| status = HTTP_MOVED_PERMANENTLY; |
| else if (!strcasecmp(arg1, "temp")) |
| status = HTTP_MOVED_TEMPORARILY; |
| else if (!strcasecmp(arg1, "seeother")) |
| status = HTTP_SEE_OTHER; |
| else if (apr_isdigit(*arg1)) |
| status = atoi(arg1); |
| else { |
| f = arg1; |
| url = arg2; |
| } |
| |
| if (use_regex) { |
| r = ap_pregcomp(cmd->pool, f, REG_EXTENDED); |
| if (r == NULL) |
| return "Regular expression could not be compiled."; |
| } |
| |
| if (ap_is_HTTP_REDIRECT(status)) { |
| if (!url) |
| return "URL to redirect to is missing"; |
| if (!use_regex && !ap_is_url(url)) |
| return "Redirect to non-URL"; |
| } |
| else { |
| if (url) |
| return "Redirect URL not valid for this status"; |
| } |
| |
| if (cmd->path) |
| new = apr_array_push(dirconf->redirects); |
| else |
| new = apr_array_push(serverconf->redirects); |
| |
| new->fake = f; |
| new->real = url; |
| new->regexp = r; |
| new->redir_status = status; |
| return NULL; |
| } |
| |
| static const char *add_redirect(cmd_parms *cmd, void *dirconf, |
| const char *arg1, const char *arg2, |
| const char *arg3) |
| { |
| return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0); |
| } |
| |
| static const char *add_redirect2(cmd_parms *cmd, void *dirconf, |
| const char *arg1, const char *arg2) |
| { |
| return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0); |
| } |
| |
| static const char *add_redirect_regex(cmd_parms *cmd, void *dirconf, |
| const char *arg1, const char *arg2, |
| const char *arg3) |
| { |
| return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1); |
| } |
| |
| static const command_rec alias_cmds[] = |
| { |
| AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF, |
| "a fakename and a realname"), |
| AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF, |
| "a fakename and a realname"), |
| AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY, |
| OR_FILEINFO, |
| "an optional status, then document to be redirected and " |
| "destination URL"), |
| AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF, |
| "a regular expression and a filename"), |
| AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF, |
| "a regular expression and a filename"), |
| AP_INIT_TAKE23("RedirectMatch", add_redirect_regex, |
| (void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO, |
| "an optional status, then a regular expression and " |
| "destination URL"), |
| AP_INIT_TAKE2("RedirectTemp", add_redirect2, |
| (void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO, |
| "a document to be redirected, then the destination URL"), |
| AP_INIT_TAKE2("RedirectPermanent", add_redirect2, |
| (void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO, |
| "a document to be redirected, then the destination URL"), |
| {NULL} |
| }; |
| |
| static int alias_matches(const char *uri, const char *alias_fakename) |
| { |
| const char *aliasp = alias_fakename, *urip = uri; |
| |
| while (*aliasp) { |
| if (*aliasp == '/') { |
| /* any number of '/' in the alias matches any number in |
| * the supplied URI, but there must be at least one... |
| */ |
| if (*urip != '/') |
| return 0; |
| |
| do { |
| ++aliasp; |
| } while (*aliasp == '/'); |
| do { |
| ++urip; |
| } while (*urip == '/'); |
| } |
| else { |
| /* Other characters are compared literally */ |
| if (*urip++ != *aliasp++) |
| return 0; |
| } |
| } |
| |
| /* Check last alias path component matched all the way */ |
| |
| if (aliasp[-1] != '/' && *urip != '\0' && *urip != '/') |
| return 0; |
| |
| /* Return number of characters from URI which matched (may be |
| * greater than length of alias, since we may have matched |
| * doubled slashes) |
| */ |
| |
| return urip - uri; |
| } |
| |
| static char *try_alias_list(request_rec *r, apr_array_header_t *aliases, |
| int doesc, int *status) |
| { |
| alias_entry *entries = (alias_entry *) aliases->elts; |
| regmatch_t regm[AP_MAX_REG_MATCH]; |
| char *found = NULL; |
| int i; |
| |
| for (i = 0; i < aliases->nelts; ++i) { |
| alias_entry *p = &entries[i]; |
| int l; |
| |
| if (p->regexp) { |
| if (!ap_regexec(p->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) { |
| if (p->real) { |
| found = ap_pregsub(r->pool, p->real, r->uri, |
| AP_MAX_REG_MATCH, regm); |
| if (found && doesc) { |
| apr_uri_t uri; |
| apr_uri_parse(r->pool, found, &uri); |
| /* Do not escape the query string or fragment. */ |
| found = apr_uri_unparse(r->pool, &uri, |
| APR_URI_UNP_OMITQUERY); |
| found = ap_escape_uri(r->pool, found); |
| if (uri.query) { |
| found = apr_pstrcat(r->pool, found, "?", |
| uri.query, NULL); |
| } |
| if (uri.fragment) { |
| found = apr_pstrcat(r->pool, found, "#", |
| uri.fragment, NULL); |
| } |
| } |
| } |
| else { |
| /* need something non-null */ |
| found = apr_pstrdup(r->pool, ""); |
| } |
| } |
| } |
| else { |
| l = alias_matches(r->uri, p->fake); |
| |
| if (l > 0) { |
| if (doesc) { |
| char *escurl; |
| escurl = ap_os_escape_path(r->pool, r->uri + l, 1); |
| |
| found = apr_pstrcat(r->pool, p->real, escurl, NULL); |
| } |
| else |
| found = apr_pstrcat(r->pool, p->real, r->uri + l, NULL); |
| } |
| } |
| |
| if (found) { |
| if (p->handler) { /* Set handler, and leave a note for mod_cgi */ |
| r->handler = p->handler; |
| apr_table_setn(r->notes, "alias-forced-type", r->handler); |
| } |
| /* XXX This is as SLOW as can be, next step, we optimize |
| * and merge to whatever part of the found path was already |
| * canonicalized. After I finish eliminating os canonical. |
| * Better fail test for ap_server_root_relative needed here. |
| */ |
| if (!doesc) { |
| found = ap_server_root_relative(r->pool, found); |
| } |
| if (found) { |
| *status = p->redir_status; |
| } |
| return found; |
| } |
| |
| } |
| |
| return NULL; |
| } |
| |
| static int translate_alias_redir(request_rec *r) |
| { |
| ap_conf_vector_t *sconf = r->server->module_config; |
| alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module); |
| char *ret; |
| int status; |
| |
| if (r->uri[0] != '/' && r->uri[0] != '\0') { |
| return DECLINED; |
| } |
| |
| if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) { |
| if (ap_is_HTTP_REDIRECT(status)) { |
| /* include QUERY_STRING if any */ |
| if (r->args) { |
| ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL); |
| } |
| apr_table_setn(r->headers_out, "Location", ret); |
| } |
| return status; |
| } |
| |
| if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) { |
| r->filename = ret; |
| return OK; |
| } |
| |
| return DECLINED; |
| } |
| |
| static int fixup_redir(request_rec *r) |
| { |
| void *dconf = r->per_dir_config; |
| alias_dir_conf *dirconf = |
| (alias_dir_conf *) ap_get_module_config(dconf, &alias_module); |
| char *ret; |
| int status; |
| |
| /* It may have changed since last time, so try again */ |
| |
| if ((ret = try_alias_list(r, dirconf->redirects, 1, &status)) != NULL) { |
| if (ap_is_HTTP_REDIRECT(status)) { |
| if (ret[0] == '/') { |
| char *orig_target = ret; |
| |
| ret = ap_construct_url(r->pool, ret, r); |
| ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, |
| "incomplete redirection target of '%s' for " |
| "URI '%s' modified to '%s'", |
| orig_target, r->uri, ret); |
| } |
| if (!ap_is_url(ret)) { |
| status = HTTP_INTERNAL_SERVER_ERROR; |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, |
| "cannot redirect '%s' to '%s'; " |
| "target is not a valid absoluteURI or abs_path", |
| r->uri, ret); |
| } |
| else { |
| /* append requested query only, if the config didn't |
| * supply its own. |
| */ |
| if (r->args && !ap_strchr(ret, '?')) { |
| ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL); |
| } |
| apr_table_setn(r->headers_out, "Location", ret); |
| } |
| } |
| return status; |
| } |
| |
| return DECLINED; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| static const char * const aszSucc[]={ "mod_userdir.c", |
| "mod_vhost_alias.c",NULL }; |
| |
| ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE); |
| ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE); |
| } |
| |
| module AP_MODULE_DECLARE_DATA alias_module = |
| { |
| STANDARD20_MODULE_STUFF, |
| create_alias_dir_config, /* dir config creater */ |
| merge_alias_dir_config, /* dir merger --- default is to override */ |
| create_alias_config, /* server config */ |
| merge_alias_config, /* merge server configs */ |
| alias_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
