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apache / httpd / e3b2b9dd466c8567bb8e5f56d5c9914b4eda8d7b / . / modules / proxy / proxy_ftp.c
blob: 39a2283bf06c25ba4fdf4d0f2b712b92206cde2b [file] [log] [blame]
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/* FTP routines for Apache proxy */
#include "mod_proxy.h"
#define AUTODETECT_PWD
module AP_MODULE_DECLARE_DATA proxy_ftp_module;
PROXY_DECLARE (int) ap_proxy_ftp_canon(request_rec *r, char *url);
PROXY_DECLARE (int) ap_proxy_ftp_handler(request_rec *r, proxy_server_conf *conf,
char *url, const char *proxyhost,
apr_port_t proxyport);
apr_status_t ap_proxy_send_dir_filter(ap_filter_t *f,
apr_bucket_brigade *bb);
/*
* Decodes a '%' escaped string, and returns the number of characters
*/
static int decodeenc(char *x)
{
int i, j, ch;
if (x[0] == '\0')
return 0; /* special case for no characters */
for (i = 0, j = 0; x[i] != '\0'; i++, j++) {
/* decode it if not already done */
ch = x[i];
if (ch == '%' && ap_isxdigit(x[i + 1]) && ap_isxdigit(x[i + 2])) {
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
}
x[j] = ch;
}
x[j] = '\0';
return j;
}
/*
* checks an encoded ftp string for bad characters, namely, CR, LF or
* non-ascii character
*/
static int ftp_check_string(const char *x)
{
int i, ch = 0;
for (i = 0; x[i] != '\0'; i++) {
ch = x[i];
if (ch == '%' && ap_isxdigit(x[i + 1]) && ap_isxdigit(x[i + 2])) {
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
}
#if !APR_CHARSET_EBCDIC
if (ch == '\015' || ch == '\012' || (ch & 0x80))
#else /*APR_CHARSET_EBCDIC*/
if (ch == '\r' || ch == '\n' || (os_toascii[ch] & 0x80))
#endif /*APR_CHARSET_EBCDIC*/
return 0;
}
return 1;
}
/*
* Canonicalise ftp URLs.
*/
PROXY_DECLARE (int) ap_proxy_ftp_canon(request_rec *r, char *url)
{
char *user, *password, *host, *path, *parms, *strp, sport[7];
apr_pool_t *p = r->pool;
const char *err;
apr_port_t port, def_port;
/* */
if (strncasecmp(url, "ftp:", 4) == 0) {
url += 4;
}
else {
return DECLINED;
}
def_port = ap_default_port_for_scheme("ftp");
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: canonicalising URL %s", url);
port = def_port;
err = ap_proxy_canon_netloc(p, &url, &user, &password, &host, &port);
if (err)
return HTTP_BAD_REQUEST;
if (user != NULL && !ftp_check_string(user))
return HTTP_BAD_REQUEST;
if (password != NULL && !ftp_check_string(password))
return HTTP_BAD_REQUEST;
/* now parse path/parameters args, according to rfc1738 */
/* N.B. if this isn't a true proxy request, then the URL path
* (but not query args) has already been decoded.
* This gives rise to the problem of a ; being decoded into the
* path.
*/
strp = strchr(url, ';');
if (strp != NULL) {
*(strp++) = '\0';
parms = ap_proxy_canonenc(p, strp, strlen(strp), enc_parm,
r->proxyreq);
if (parms == NULL)
return HTTP_BAD_REQUEST;
}
else
parms = "";
path = ap_proxy_canonenc(p, url, strlen(url), enc_path, r->proxyreq);
if (path == NULL)
return HTTP_BAD_REQUEST;
if (!ftp_check_string(path))
return HTTP_BAD_REQUEST;
if (r->proxyreq && r->args != NULL) {
if (strp != NULL) {
strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_parm, 1);
if (strp == NULL)
return HTTP_BAD_REQUEST;
parms = apr_pstrcat(p, parms, "?", strp, NULL);
}
else {
strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_fpath, 1);
if (strp == NULL)
return HTTP_BAD_REQUEST;
path = apr_pstrcat(p, path, "?", strp, NULL);
}
r->args = NULL;
}
/* now, rebuild URL */
if (port != def_port)
apr_snprintf(sport, sizeof(sport), ":%d", port);
else
sport[0] = '\0';
r->filename = apr_pstrcat(p, "proxy:ftp://", (user != NULL) ? user : "",
(password != NULL) ? ":" : "",
(password != NULL) ? password : "",
(user != NULL) ? "@" : "", host, sport, "/", path,
(parms[0] != '\0') ? ";" : "", parms, NULL);
return OK;
}
/* we chop lines longer than 80 characters */
#define MAX_LINE_LEN 80
/*
* Reads response lines, returns both the ftp status code and
* remembers the response message in the supplied buffer
*/
static int ftp_getrc_msg(conn_rec *c, apr_bucket_brigade *bb, char *msgbuf, int msglen)
{
int status;
char response[MAX_LINE_LEN];
char buff[5];
char *mb = msgbuf,
*me = &msgbuf[msglen];
apr_status_t rv;
int eos;
if (APR_SUCCESS != (rv = ap_proxy_string_read(c, bb, response, sizeof(response), &eos))) {
return -1;
}
if (!apr_isdigit(response[0]) || !apr_isdigit(response[1]) ||
!apr_isdigit(response[2]) || (response[3] != ' ' && response[3] != '-'))
status = 0;
else
status = 100 * response[0] + 10 * response[1] + response[2] - 111 * '0';
mb = apr_cpystrn(mb, response+4, me - mb);
if (response[3] == '-') {
memcpy(buff, response, 3);
buff[3] = ' ';
do {
if (APR_SUCCESS != (rv = ap_proxy_string_read(c, bb, response, sizeof(response), &eos))) {
return -1;
}
mb = apr_cpystrn(mb, response + (' ' == response[0] ? 1 : 4), me - mb);
} while (memcmp(response, buff, 4) != 0);
}
return status;
}
/* this is a filter that turns a raw ASCII directory listing into pretty HTML */
/* ideally, mod_proxy should simply send the raw directory list up the filter
* stack to mod_autoindex, which in theory should turn the raw ascii into
* pretty html along with all the bells and whistles it provides...
*
* all in good time...! :)
*/
typedef struct {
apr_bucket_brigade *in;
char buffer[MAX_STRING_LEN];
enum {HEADER, BODY, FOOTER} state;
} proxy_dir_ctx_t;
apr_status_t ap_proxy_send_dir_filter(ap_filter_t *f, apr_bucket_brigade *in)
{
request_rec *r = f->r;
apr_pool_t *p = r->pool;
apr_bucket *e;
apr_bucket_brigade *out = apr_brigade_create(p);
apr_status_t rv;
register int n;
char *dir, *path, *reldir, *site, *str;
const char *pwd = apr_table_get(r->notes, "Directory-PWD");
const char *readme = apr_table_get(r->notes, "Directory-README");
proxy_dir_ctx_t *ctx = f->ctx;
if (!ctx) {
f->ctx = ctx = apr_pcalloc(p, sizeof(*ctx));
ctx->in = apr_brigade_create(p);
ctx->buffer[0] = 0;
ctx->state = HEADER;
}
/* combine the stored and the new */
APR_BRIGADE_CONCAT(ctx->in, in);
if (HEADER == ctx->state) {
/* Save "scheme://site" prefix without password */
site = ap_unparse_uri_components(p, &f->r->parsed_uri, UNP_OMITPASSWORD|UNP_OMITPATHINFO);
/* ... and path without query args */
path = ap_unparse_uri_components(p, &f->r->parsed_uri, UNP_OMITSITEPART|UNP_OMITQUERY);
(void)decodeenc(path);
/* Copy path, strip (all except the last) trailing slashes */
path = dir = apr_pstrcat(p, path, "/", NULL);
while ((n = strlen(path)) > 1 && path[n-1] == '/' && path[n-2] == '/')
path[n-1] = '\0';
/* print "ftp://host/" */
str = apr_psprintf(p, DOCTYPE_HTML_3_2
"\n\n<HTML>\n<HEAD>\n<TITLE>%s%s</TITLE>\n"
"<BASE HREF=\"%s%s\">\n</HEAD>\n\n"
"<BODY>\n\n<H2>Directory of "
"<A HREF=\"/\">%s</A>/",
site, path, site, path, site);
e = apr_bucket_pool_create(str, strlen(str), p);
APR_BRIGADE_INSERT_TAIL(out, e);
while ((dir = strchr(dir+1, '/')) != NULL)
{
*dir = '\0';
if ((reldir = strrchr(path+1, '/'))==NULL)
reldir = path+1;
else
++reldir;
/* print "path/" component */
str = apr_psprintf(p, "<A HREF=\"/%s/\">%s</A>/", path+1, reldir);
e = apr_bucket_pool_create(str, strlen(str), p);
APR_BRIGADE_INSERT_TAIL(out, e);
*dir = '/';
}
/* If the caller has determined the current directory, and it differs */
/* from what the client requested, then show the real name */
if (pwd == NULL || strncmp (pwd, path, strlen(pwd)) == 0) {
str = apr_psprintf(p, "</H2>\n\n<HR></HR>\n\n<PRE>");
} else {
str = apr_psprintf(p, "</H2>\n\n(%s)\n\n<HR></HR>\n\n<PRE>", pwd);
}
e = apr_bucket_pool_create(str, strlen(str), p);
APR_BRIGADE_INSERT_TAIL(out, e);
/* print README */
if (readme) {
str = apr_psprintf(p, "%s\n</PRE>\n\n<HR></HR>\n\n<PRE>\n",
readme);
e = apr_bucket_pool_create(str, strlen(str), p);
APR_BRIGADE_INSERT_TAIL(out, e);
}
/* make sure page intro gets sent out */
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(out, e);
if (APR_SUCCESS != (rv = ap_pass_brigade(f->next, out))) {
return rv;
}
apr_brigade_cleanup(out);
ctx->state = BODY;
}
/* loop through each line of directory */
while (BODY == ctx->state) {
char *filename;
int found = 0;
int eos = 0;
ctx->buffer[0] = 0;
/* get a complete line */
/* if the buffer overruns - throw data away */
while (!found && !APR_BRIGADE_EMPTY(ctx->in)) {
char *pos, *response;
apr_size_t len, max;
e = APR_BRIGADE_FIRST(ctx->in);
if (APR_BUCKET_IS_EOS(e)) {
eos = 1;
break;
}
if (APR_SUCCESS != (rv = apr_bucket_read(e, (const char **)&response, &len, APR_BLOCK_READ))) {
return rv;
}
pos = memchr(response, APR_ASCII_LF, len);
if (pos != NULL) {
if ((pos - response + 1) != len) {
len = pos - response + 1;
apr_bucket_split(e, pos - response + 1);
}
found = 1;
}
max = sizeof(ctx->buffer)-strlen(ctx->buffer)-1;
if (len > max) {
len = max;
}
/* strncat works here, but apr_cpystrn does not - the last char gets chopped, dunno why */
/* apr_cpystrn(ctx->buffer+strlen(ctx->buffer), response, len);*/
strncat(ctx->buffer, response, len);
APR_BUCKET_REMOVE(e);
apr_bucket_destroy(e);
}
/* EOS? jump to footer */
if (eos) {
ctx->state = FOOTER;
break;
}
/* not complete? leave and try get some more */
if (!found) {
return APR_SUCCESS;
}
/* a symlink? */
if (ctx->buffer[0] == 'l' && (filename=strstr(ctx->buffer, " -> ")) != NULL) {
char *link_ptr = filename;
do {
filename--;
} while (filename[0] != ' ');
*(filename++) = '\0';
*(link_ptr++) = '\0';
if ((n = strlen(link_ptr)) > 1 && link_ptr[n - 1] == '\n')
link_ptr[n - 1] = '\0';
str = apr_psprintf(p, "%s <A HREF=\"%s\">%s %s</A>\n", ctx->buffer, filename, filename, link_ptr);
}
/* a directory/file? */
else if (ctx->buffer[0] == 'd' || ctx->buffer[0] == '-' || ctx->buffer[0] == 'l' || apr_isdigit(ctx->buffer[0])) {
int searchidx = 0;
char *searchptr = NULL;
int firstfile = 1;
if (apr_isdigit(ctx->buffer[0])) { /* handle DOS dir */
searchptr = strchr(ctx->buffer, '<');
if (searchptr != NULL)
*searchptr = '[';
searchptr = strchr(ctx->buffer, '>');
if (searchptr != NULL)
*searchptr = ']';
}
filename = strrchr(ctx->buffer, ' ');
*(filename++) = 0;
filename[strlen(filename) - 1] = 0;
/* handle filenames with spaces in 'em */
if (!strcmp(filename, ".") || !strcmp(filename, "..") || firstfile) {
firstfile = 0;
searchidx = filename - ctx->buffer;
}
else if (searchidx != 0 && ctx->buffer[searchidx] != 0) {
*(--filename) = ' ';
ctx->buffer[searchidx - 1] = 0;
filename = &ctx->buffer[searchidx];
}
/* Special handling for '.' and '..' */
if (!strcmp(filename, ".") || !strcmp(filename, "..") || ctx->buffer[0] == 'd') {
str = apr_psprintf(p, "%s <A HREF=\"%s/\">%s</A>\n",
ctx->buffer, filename, filename);
}
else {
str = apr_psprintf(p, "%s <A HREF=\"%s\">%s</A>\n",
ctx->buffer, filename, filename);
}
}
e = apr_bucket_pool_create(str, strlen(str), p);
APR_BRIGADE_INSERT_TAIL(out, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(out, e);
if (APR_SUCCESS != (rv = ap_pass_brigade(f->next, out))) {
return rv;
}
apr_brigade_cleanup(out);
}
if (FOOTER == ctx->state) {
str = apr_psprintf(p, "</PRE>\n\n<HR></HR>\n\n%s\n\n</BODY>\n</HTML>\n", ap_psignature("", r));
e = apr_bucket_pool_create(str, strlen(str), p);
APR_BRIGADE_INSERT_TAIL(out, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(out, e);
e = apr_bucket_eos_create();
APR_BRIGADE_INSERT_TAIL(out, e);
if (APR_SUCCESS != (rv = ap_pass_brigade(f->next, out))) {
return rv;
}
apr_brigade_destroy(out);
}
return APR_SUCCESS;
}
/* Common routine for failed authorization (i.e., missing or wrong password)
* to an ftp service. This causes most browsers to retry the request
* with username and password (which was presumably queried from the user)
* supplied in the Authorization: header.
* Note that we "invent" a realm name which consists of the
* ftp://user@host part of the reqest (sans password -if supplied but invalid-)
*/
static int ftp_unauthorized (request_rec *r, int log_it)
{
r->proxyreq = PROXYREQ_NONE;
/* Log failed requests if they supplied a password
* (log username/password guessing attempts)
*/
if (log_it)
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r,
"proxy: missing or failed auth to %s",
ap_unparse_uri_components(r->pool,
&r->parsed_uri, UNP_OMITPATHINFO));
apr_table_setn(r->err_headers_out, "WWW-Authenticate",
apr_pstrcat(r->pool, "Basic realm=\"",
ap_unparse_uri_components(r->pool, &r->parsed_uri,
UNP_OMITPASSWORD|UNP_OMITPATHINFO),
"\"", NULL));
return HTTP_UNAUTHORIZED;
}
/*
* Handles direct access of ftp:// URLs
* Original (Non-PASV) version from
* Troy Morrison <spiffnet@zoom.com>
* PASV added by Chuck
* Filters by [Graham Leggett <minfrin@sharp.fm>]
*/
PROXY_DECLARE (int) ap_proxy_ftp_handler(request_rec *r, proxy_server_conf *conf,
char *url, const char *proxyhost,
apr_port_t proxyport)
{
apr_pool_t *p = r->pool;
conn_rec *c = r->connection;
proxy_conn_rec *backend;
apr_socket_t *sock, *local_sock, *remote_sock;
apr_sockaddr_t *connect_addr;
apr_status_t rv;
conn_rec *origin, *remote;
int err;
apr_bucket *e;
apr_bucket_brigade *bb = apr_brigade_create(p);
apr_bucket_brigade *cbb = apr_brigade_create(p);
char *buf, *connectname;
apr_port_t connectport;
char buffer[MAX_STRING_LEN];
char *path, *strp, *parms;
char *user = NULL;
/* char *account = NULL; how to supply an account in a URL? */
const char *password = NULL;
int i, j, len, rc;
int one = 1;
char *size = NULL;
/* stuff for PASV mode */
int connect = 0, use_port = 0;
char dates[AP_RFC822_DATE_LEN];
/* is this for us? */
if (proxyhost) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: rejecting URL %s - proxyhost %s specified:", url, proxyhost);
return DECLINED; /* proxy connections are via HTTP */
}
if (strncasecmp(url, "ftp:", 4)) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: rejecting URL %s - not ftp:", url);
return DECLINED; /* only interested in FTP */
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: serving URL %s", url);
/* create space for state information */
backend = (proxy_conn_rec *) ap_get_module_config(c->conn_config, &proxy_ftp_module);
if (!backend) {
backend = ap_pcalloc(c->pool, sizeof(proxy_conn_rec));
backend->connection = NULL;
backend->hostname = NULL;
backend->port = 0;
ap_set_module_config(c->conn_config, &proxy_ftp_module, backend);
}
/*
* I: Who Do I Connect To?
* -----------------------
*
* Break up the URL to determine the host to connect to
*/
/* we only support GET and HEAD */
if (r->method_number != M_GET)
return HTTP_NOT_IMPLEMENTED;
/* We break the URL into host, port, path-search */
connectname = r->parsed_uri.hostname;
connectport = (r->parsed_uri.port != 0)
? r->parsed_uri.port
: ap_default_port_for_request(r);
path = apr_pstrdup(p, r->parsed_uri.path);
path = (path != NULL && path[0] != '\0') ? &path[1] : "";
parms = strchr(path, ';');
if (parms != NULL)
*(parms++) = '\0';
/* The "Authorization:" header must be checked first.
* We allow the user to "override" the URL-coded user [ & password ]
* in the Browsers' User&Password Dialog.
* NOTE that this is only marginally more secure than having the
* password travel in plain as part of the URL, because Basic Auth
* simply uuencodes the plain text password.
* But chances are still smaller that the URL is logged regularly.
*/
if ((password = apr_table_get(r->headers_in, "Authorization")) != NULL
&& strcasecmp(ap_getword(r->pool, &password, ' '), "Basic") == 0
&& (password = ap_pbase64decode(r->pool, password))[0] != ':') {
/* Note that this allocation has to be made from r->connection->pool
* because it has the lifetime of the connection. The other allocations
* are temporary and can be tossed away any time.
*/
user = ap_getword_nulls (r->connection->pool, &password, ':');
r->ap_auth_type = "Basic";
r->user = r->parsed_uri.user = user;
}
else if ((user = r->parsed_uri.user) != NULL) {
user = apr_pstrdup(p, user);
decodeenc(user);
if ((password = r->parsed_uri.password) != NULL) {
char *tmp = apr_pstrdup(p, password);
decodeenc(tmp);
password = tmp;
}
}
else {
user = "anonymous";
password = "apache-proxy@";
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: connecting %s to %s:%d", url, connectname, connectport);
/* do a DNS lookup for the destination host */
err = apr_sockaddr_info_get(&connect_addr, connectname, APR_UNSPEC, connectport, 0, p);
/* check if ProxyBlock directive on this host */
if (OK != ap_proxy_checkproxyblock(r, conf, connect_addr)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
/*
* II: Make the Connection
* -----------------------
*
* We have determined who to connect to. Now make the connection.
*/
/* get all the possible IP addresses for the destname and loop through them
* until we get a successful connection
*/
if (APR_SUCCESS != err) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_pstrcat(p,
"DNS lookup failure for: ",
connectname, NULL));
}
if ((rv = apr_socket_create(&sock, APR_INET, SOCK_STREAM, r->pool)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error creating socket");
return HTTP_INTERNAL_SERVER_ERROR;
}
#if !defined(TPF) && !defined(BEOS)
if (conf->recv_buffer_size > 0
&& (rv = apr_setsocketopt(sock, APR_SO_RCVBUF,
conf->recv_buffer_size))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
}
#endif
if (APR_SUCCESS != (rv = apr_setsocketopt(sock, APR_SO_REUSEADDR, one))) {
#ifndef _OSD_POSIX /* BS2000 has this option "always on" */
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error setting reuseaddr option: setsockopt(SO_REUSEADDR)");
return HTTP_INTERNAL_SERVER_ERROR;
#endif /*_OSD_POSIX*/
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: socket has been created");
/*
* At this point we have a list of one or more IP addresses of
* the machine to connect to. If configured, reorder this
* list so that the "best candidate" is first try. "best
* candidate" could mean the least loaded server, the fastest
* responding server, whatever.
*
* For now we do nothing, ie we get DNS round robin.
* XXX FIXME
*/
/* try each IP address until we connect successfully */
{
int failed = 1;
while (connect_addr) {
/* make the connection out of the socket */
rv = apr_connect(sock, connect_addr);
/* if an error occurred, loop round and try again */
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
"proxy: FTP: attempt to connect to %pI (%s) failed", connect_addr, connectname);
connect_addr = connect_addr->next;
continue;
}
/* if we get here, all is well */
failed = 0;
break;
}
/* handle a permanent error from the above loop */
if (failed) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_psprintf(r->pool,
"Could not connect to remote machine: %s port %d",
connectname, connectport));
}
}
/* the socket is now open, create a new connection */
origin = ap_new_connection(p, r->server, sock, r->connection->id);
if (!origin) {
/* the peer reset the connection already; ap_new_connection()
* closed the socket */
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: an error occurred creating a new connection to %pI (%s)", connect_addr, connectname);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* if a keepalive connection is floating around, close it first! */
/* we might support ftp keepalives later, but not now... */
if (backend->connection) {
apr_socket_close(backend->connection->client_socket);
backend->connection = NULL;
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: control connection complete");
/*
* III: Send Control Request
* -------------------------
*
* Log into the ftp server, send the username & password, change to the correct
* directory...
*/
/* set up the connection filters */
ap_proxy_pre_http_connection(origin, NULL);
/* possible results: */
/* 120 Service ready in nnn minutes. */
/* 220 Service ready for new user. */
/* 421 Service not available, closing control connection. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, "Error reading from remote server");
}
if (i == 120) {
/* RFC2616 states:
* 14.37 Retry-After
*
* The Retry-After response-header field can be used with a 503 (Service
* Unavailable) response to indicate how long the service is expected to
* be unavailable to the requesting client. [...] The value of this field
* can be either an HTTP-date or an integer number of seconds (in decimal)
* after the time of the response.
* Retry-After = "Retry-After" ":" ( HTTP-date | delta-seconds )
*/
for (i=0 ; buffer[i] && !isdigit(buffer[i]); i++);
if (buffer[i]) {
ap_table_add(r->headers_out, "Retry-After", apr_psprintf(p, "%lu", 60*atol(buffer+i)));
}
return ap_proxyerror(r, HTTP_SERVICE_UNAVAILABLE, buffer);
}
if (i != 220) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: connected.");
buf = apr_pstrcat(p, "USER ", user, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: USER %s", user);
/* possible results; 230, 331, 332, 421, 500, 501, 530 */
/* states: 1 - error, 2 - success; 3 - send password, 4,5 fail */
/* 230 User logged in, proceed. */
/* 331 User name okay, need password. */
/* 332 Need account for login. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* (This may include errors such as command line too long.) */
/* 501 Syntax error in parameters or arguments. */
/* 530 Not logged in. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, "Error reading from remote server");
}
if (i == 530) {
return ftp_unauthorized (r, 1); /* log it: user name guessing attempt? */
}
if (i != 230 && i != 331) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
if (i == 331) { /* send password */
if (password == NULL) {
return ftp_unauthorized (r, 0);
}
buf = apr_pstrcat(p, "PASS ", password, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: PASS %s", password);
/* possible results 202, 230, 332, 421, 500, 501, 503, 530 */
/* 230 User logged in, proceed. */
/* 332 Need account for login. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 503 Bad sequence of commands. */
/* 530 Not logged in. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 332) {
return ap_proxyerror(r, HTTP_UNAUTHORIZED,
apr_pstrcat(p, "Need account for login: ", buffer, NULL));
}
/* @@@ questionable -- we might as well return a 403 Forbidden here */
if (i == 530) {
return ftp_unauthorized (r, 1); /* log it: passwd guessing attempt? */
}
if (i != 230 && i != 202) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
}
apr_table_set(r->notes, "Directory-README", buffer);
/* set the directory (walk directory component by component):
* this is what we must do if we don't know the OS type of the remote
* machine
*/
for (;;) {
strp = strchr(path, '/');
if (strp == NULL)
break;
*strp = '\0';
len = decodeenc(path);
buf = apr_pstrcat(p, "CWD ", path, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: CWD %s", path);
*strp = '/';
/* responses: 250, 421, 500, 501, 502, 530, 550 */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return ap_proxyerror(r, HTTP_NOT_FOUND, buffer);
}
if (i != 250) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
path = strp + 1;
}
if (parms != NULL && strncasecmp(parms, "type=a", 6) == 0) {
parms = "A";
}
else {
parms = "I";
}
/* changed to make binary transfers the default */
/* set type to binary */
buf = apr_pstrcat(p, "TYPE ", parms, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: TYPE I");
/* responses: 200, 421, 500, 501, 504, 530 */
/* 200 Command okay. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 504 Command not implemented for that parameter. */
/* 530 Not logged in. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i != 200 && i != 504) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
/* Allow not implemented */
if (i == 504) {
parms[0] = '\0';
}
/*
* IV: Make Data Connection?
* -------------------------
*
* Try EPSV, if that fails...
* try PASV, if that fails...
* try PORT.
*/
/* this temporarily switches off EPSV/PASV */
/*goto bypass;*/
/* set up data connection - EPSV */
{
apr_sockaddr_t *remote_addr;
char *remote_ip;
apr_port_t remote_port;
/* The EPSV command replaces PASV where both IPV4 and IPV6 is supported. Only
* the port is returned, the IP address is always the same as that on the
* control connection. Example:
* Entering Extended Passive Mode (|||6446|)
*/
buf = apr_pstrcat(p, "EPSV", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: EPSV");
/* possible results: 227, 421, 500, 501, 502, 530 */
/* 227 Entering Passive Mode (h1,h2,h3,h4,p1,p2). */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i != 229 && i != 500 && i != 501 && i != 502) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
else if (i == 229) {
char *pstr;
pstr = apr_pstrdup(p, buffer);
pstr = strtok(pstr, " "); /* separate result code */
if (pstr != NULL) {
if (*(pstr + strlen(pstr) + 1) == '=') {
pstr += strlen(pstr) + 2;
}
else {
pstr = strtok(NULL, "("); /* separate address & port params */
if (pstr != NULL)
pstr = strtok(NULL, ")");
}
}
if (pstr) {
apr_sockaddr_t *epsv_addr;
remote_port = atoi(pstr+3);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: EPSV contacting remote host on port %d",
remote_port);
if ((rv = apr_socket_create(&remote_sock, APR_INET, SOCK_STREAM, r->pool)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error creating EPSV socket");
return HTTP_INTERNAL_SERVER_ERROR;
}
#if !defined (TPF) && !defined(BEOS)
if (conf->recv_buffer_size > 0 && (rv = apr_setsocketopt(remote_sock, APR_SO_RCVBUF,
conf->recv_buffer_size))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
}
#endif
/* make the connection */
apr_socket_addr_get(&remote_addr, APR_REMOTE, sock);
apr_sockaddr_ip_get(&remote_ip, remote_addr);
apr_sockaddr_info_get(&epsv_addr, remote_ip, APR_INET, remote_port, 0, p);
rv = apr_connect(remote_sock, epsv_addr);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
"proxy: FTP: EPSV attempt to connect to %pI failed - Firewall/NAT?", epsv_addr);
return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_psprintf(r->pool,
"EPSV attempt to connect to %pI failed - firewall/NAT?", epsv_addr));
}
else {
connect = 1;
}
}
else {
/* and try the regular way */
apr_socket_close(remote_sock);
}
}
}
/* set up data connection - PASV */
if (!connect) {
buf = apr_pstrcat(p, "PASV", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: PASV");
/* possible results: 227, 421, 500, 501, 502, 530 */
/* 227 Entering Passive Mode (h1,h2,h3,h4,p1,p2). */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i != 227 && i != 502) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
else if (i == 227) {
unsigned int h0, h1, h2, h3, p0, p1;
char *pstr;
/* FIXME: Check PASV against RFC1123 */
pstr = apr_pstrdup(p, buffer);
pstr = strtok(pstr, " "); /* separate result code */
if (pstr != NULL) {
if (*(pstr + strlen(pstr) + 1) == '=') {
pstr += strlen(pstr) + 2;
}
else {
pstr = strtok(NULL, "("); /* separate address & port params */
if (pstr != NULL)
pstr = strtok(NULL, ")");
}
}
/* FIXME: Only supports IPV4 - fix in RFC2428 */
if (pstr != NULL && (sscanf(pstr,
"%d,%d,%d,%d,%d,%d", &h3, &h2, &h1, &h0, &p1, &p0) == 6)) {
apr_sockaddr_t *pasv_addr;
int pasvport = (p1 << 8) + p0;
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: PASV contacting host %d.%d.%d.%d:%d",
h3, h2, h1, h0, pasvport);
if ((rv = apr_socket_create(&remote_sock, APR_INET, SOCK_STREAM, r->pool)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: error creating PASV socket");
return HTTP_INTERNAL_SERVER_ERROR;
}
#if !defined (TPF) && !defined(BEOS)
if (conf->recv_buffer_size > 0 && (rv = apr_setsocketopt(remote_sock, APR_SO_RCVBUF,
conf->recv_buffer_size))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
}
#endif
/* make the connection */
apr_sockaddr_info_get(&pasv_addr, apr_psprintf(p, "%d.%d.%d.%d", h3, h2, h1, h0), APR_INET, pasvport, 0, p);
rv = apr_connect(remote_sock, pasv_addr);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
"proxy: FTP: PASV attempt to connect to %pI failed - Firewall/NAT?", pasv_addr);
return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_psprintf(r->pool,
"PASV attempt to connect to %pI failed - firewall/NAT?", pasv_addr));
}
else {
connect = 1;
}
}
else {
/* and try the regular way */
apr_socket_close(remote_sock);
}
}
}
/*bypass:*/
/* set up data connection - PORT */
if (!connect) {
apr_sockaddr_t *local_addr;
char *local_ip;
apr_port_t local_port;
unsigned int h0, h1, h2, h3, p0, p1;
if ((rv = apr_socket_create(&local_sock, APR_INET, SOCK_STREAM, r->pool)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error creating local socket");
return HTTP_INTERNAL_SERVER_ERROR;
}
apr_socket_addr_get(&local_addr, APR_LOCAL, sock);
apr_sockaddr_port_get(&local_port, local_addr);
apr_sockaddr_ip_get(&local_ip, local_addr);
if ((rv = apr_setsocketopt(local_sock, APR_SO_REUSEADDR, one)) != APR_SUCCESS) {
#ifndef _OSD_POSIX /* BS2000 has this option "always on" */
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error setting reuseaddr option");
return HTTP_INTERNAL_SERVER_ERROR;
#endif /*_OSD_POSIX*/
}
apr_sockaddr_info_get(&local_addr, local_ip, APR_UNSPEC, local_port, 0, r->pool);
if ((rv = apr_bind(local_sock, local_addr)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error binding to ftp data socket %pI", local_addr);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* only need a short queue */
if ((rv = apr_listen(local_sock, 2)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: error listening to ftp data socket %pI", local_addr);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* FIXME: Sent PORT here */
if (local_ip && (sscanf(local_ip,
"%d.%d.%d.%d", &h3, &h2, &h1, &h0) == 4)) {
p1 = (local_port >> 8);
p0 = (local_port & 0xFF);
buf = apr_psprintf(p, "PORT %d,%d,%d,%d,%d,%d" CRLF, h3, h2, h1, h0, p1, p0);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: PORT %d,%d,%d,%d,%d,%d", h3, h2, h1, h0, p1, p0);
/* possible results: 200, 421, 500, 501, 502, 530 */
/* 200 Command okay. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
rc = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", rc, buffer);
if (rc == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc != 200) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
/* signal that we must use the EPRT/PORT loop */
use_port = 1;
}
else {
/* IPV6 FIXME:
* The EPRT command replaces PORT where both IPV4 and IPV6 is supported. The first
* number (1,2) indicates the protocol type. Examples:
* EPRT |1|132.235.1.2|6275|
* EPRT |2|1080::8:800:200C:417A|5282|
*/
return ap_proxyerror(r, HTTP_NOT_IMPLEMENTED, "Connect to IPV6 ftp server using EPRT not supported. Enable EPSV.");
}
}
/*
* V: Set The Headers
* -------------------
*
* Get the size of the request, set up the environment for HTTP.
*/
/* set request; "path" holds last path component */
len = decodeenc(path);
/* TM - if len == 0 then it must be a directory (you can't RETR nothing) */
if (len == 0) {
parms = "d";
}
else {
buf = apr_pstrcat(p, "SIZE ", path, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: SIZE %s", path);
i = ftp_getrc_msg(origin, cbb, buffer, sizeof buffer);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: returned status %d with response %s", i, buffer);
if (i != 500) { /* Size command not recognized */
if (i == 550) { /* Not a regular file */
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: SIZE shows this is a directory");
parms = "d";
buf = apr_pstrcat(p, "CWD ", path, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: CWD %s", path);
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
/* possible results: 250, 421, 500, 501, 502, 530, 550 */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return ap_proxyerror(r, HTTP_NOT_FOUND, buffer);
}
if (i != 250) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
path = "";
len = 0;
}
else if (i == 213) { /* Size command ok */
for (j = 0; j < sizeof(buffer) && apr_isdigit(buffer[j]); j++);
buffer[j] = '\0';
if (buffer[0] != '\0')
size = apr_pstrdup(p, buffer);
}
}
}
#ifdef AUTODETECT_PWD
buf = apr_pstrcat(p, "PWD", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: PWD");
/* responses: 257, 500, 501, 502, 421, 550 */
/* 257 "<directory-name>" <commentary> */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 550 Requested action not taken. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1 || i == 421) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return ap_proxyerror(r, HTTP_NOT_FOUND, buffer);
}
if (i == 257) {
const char *dirp = buffer;
apr_table_set(r->notes, "Directory-PWD", ap_getword_conf(r->pool, &dirp));
}
#endif /*AUTODETECT_PWD*/
if (parms[0] == 'd') {
if (len != 0)
buf = apr_pstrcat(p, "LIST ", path, CRLF, NULL);
else
buf = apr_pstrcat(p, "LIST -lag", CRLF, NULL);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: LIST %s", (len == 0 ? "-lag" : path));
}
else {
/* FIXME: Handle range requests - send REST */
buf = apr_pstrcat(p, "RETR ", path, CRLF, NULL);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: RETR %s", path);
}
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
/* RETR: 110, 125, 150, 226, 250, 421, 425, 426, 450, 451, 500, 501, 530, 550
* NLST: 125, 150, 226, 250, 421, 425, 426, 450, 451, 500, 501, 502, 530 */
/* 110 Restart marker reply. */
/* 125 Data connection already open; transfer starting. */
/* 150 File status okay; about to open data connection. */
/* 226 Closing data connection. */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 425 Can't open data connection. */
/* 426 Connection closed; transfer aborted. */
/* 450 Requested file action not taken. */
/* 451 Requested action aborted. Local error in processing. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
rc = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", rc, buffer);
if (rc == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc == 550) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: RETR failed, trying LIST instead");
parms = "d";
buf = apr_pstrcat(p, "CWD ", path, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: CWD %s", path);
/* possible results: 250, 421, 500, 501, 502, 530, 550 */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
rc = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", rc, buffer);
if (rc == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc == 550) {
return ap_proxyerror(r, HTTP_NOT_FOUND, buffer);
}
if (rc != 250) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
#ifdef AUTODETECT_PWD
buf = apr_pstrcat(p, "PWD ", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: PWD");
/* responses: 257, 500, 501, 502, 421, 550 */
/* 257 "<directory-name>" <commentary> */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 550 Requested action not taken. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
if (i == -1 || i == 421) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return ap_proxyerror(r, HTTP_NOT_FOUND, buffer);
}
if (i == 257) {
const char *dirp = buffer;
apr_table_set(r->notes, "Directory-PWD", ap_getword_conf(r->pool, &dirp));
}
#endif /*AUTODETECT_PWD*/
buf = apr_pstrcat(p, "LIST -lag", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: LIST -lag");
rc = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", rc, buffer);
if (rc == -1)
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc != 125 && rc != 150 && rc != 226 && rc != 250) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, buffer);
}
r->status = HTTP_OK;
r->status_line = "200 OK";
apr_rfc822_date(dates, r->request_time);
apr_table_setn(r->headers_out, "Date", dates);
apr_table_setn(r->headers_out, "Server", ap_get_server_version());
/* set content-type */
if (parms[0] == 'd') {
r->content_type = "text/html";
}
else {
if (r->content_type) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: Content-Type set to %s", r->content_type);
}
else {
r->content_type = ap_default_type(r);
}
if (parms[0] != 'a' && size != NULL) {
/* We "trust" the ftp server to really serve (size) bytes... */
apr_table_setn(r->headers_out, "Content-Length", size);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: Content-Length set to %s", size);
}
}
apr_table_setn(r->headers_out, "Content-Type", r->content_type);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: Content-Type set to %s", r->content_type);
/* set content-encoding */
if (r->content_encoding != NULL && r->content_encoding[0] != '\0') {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: Content-Encoding set to %s", r->content_encoding);
apr_table_setn(r->headers_out, "Content-Encoding", r->content_encoding);
}
/* wait for connection */
if (use_port) {
for(;;)
{
/* FIXME: this does not return, despite the incoming connection being accepted */
switch(rv = apr_accept(&remote_sock, local_sock, r->pool))
{
case APR_EINTR:
continue;
case APR_SUCCESS:
break;
default:
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"proxy: FTP: failed to accept data connection");
return HTTP_BAD_GATEWAY;
}
}
}
/* the transfer socket is now open, create a new connection */
remote = ap_new_connection(p, r->server, remote_sock, r->connection->id);
if (!remote) {
/* the peer reset the connection already; ap_new_connection()
* closed the socket */
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: an error occurred creating the transfer connection");
return HTTP_INTERNAL_SERVER_ERROR;
}
/* set up the connection filters */
ap_proxy_pre_http_connection(remote, NULL);
/*
* VI: Receive the Response
* ------------------------
*
* Get response from the remote ftp socket, and pass it up the
* filter chain.
*/
/* send response */
r->sent_bodyct = 1;
/* read till EOF */
c->remain = -1;
if (parms[0] == 'd') {
/* insert directory filter */
ap_add_output_filter("PROXY_SEND_DIR", NULL, r, r->connection);
}
/* send body */
if (!r->header_only) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: start body send");
/* read the body, pass it to the output filters */
while (ap_get_brigade(remote->input_filters, bb, AP_MODE_BLOCKING) == APR_SUCCESS) {
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(r->output_filters, bb);
break;
}
ap_pass_brigade(r->output_filters, bb);
apr_brigade_cleanup(bb);
}
apr_brigade_cleanup(bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: end body send");
}
else {
/* abort the transfer */
buf = apr_pstrcat(p, "ABOR", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: ABOR");
/* responses: 225, 226, 421, 500, 501, 502 */
/* 225 Data connection open; no transfer in progress. */
/* 226 Closing data connection. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
}
/*
* VII: Clean Up
* -------------
*
* If there are no KeepAlives, or if the connection has been signalled
* to close, close the socket and clean up
*/
/* finish */
buf = apr_pstrcat(p, "QUIT", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: QUIT");
/* responses: 221, 500 */
/* 221 Service closing control connection. */
/* 500 Syntax error, command unrecognized. */
i = ftp_getrc_msg(origin, cbb, buffer, sizeof(buffer));
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: FTP: %d %s", i, buffer);
apr_brigade_destroy(bb);
return OK;
}
static void ap_proxy_ftp_register_hook(apr_pool_t *p)
{
/* hooks */
proxy_hook_scheme_handler(ap_proxy_ftp_handler, NULL, NULL, APR_HOOK_MIDDLE);
proxy_hook_canon_handler(ap_proxy_ftp_canon, NULL, NULL, APR_HOOK_MIDDLE);
/* filters */
ap_register_output_filter("PROXY_SEND_DIR", ap_proxy_send_dir_filter, AP_FTYPE_CONTENT);
}
module AP_MODULE_DECLARE_DATA proxy_ftp_module = {
STANDARD20_MODULE_STUFF,
NULL, /* create per-directory config structure */
NULL, /* merge per-directory config structures */
NULL, /* create per-server config structure */
NULL, /* merge per-server config structures */
NULL, /* command apr_table_t */
ap_proxy_ftp_register_hook /* register hooks */
};