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/* ====================================================================
* Copyright (c) 1996,1997 The Apache Group. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 5. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP 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 Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/* HTTP routines for Apache proxy */
#include "mod_proxy.h"
#include "http_log.h"
#include "http_main.h"
#include "util_date.h"
/*
* Canonicalise http-like URLs.
* scheme is the scheme for the URL
* url is the URL starting with the first '/'
* def_port is the default port for this scheme.
*/
int
proxy_http_canon(request_rec *r, char *url, const char *scheme, int def_port)
{
char *host, *path, *search, *p, sport[7];
const char *err;
int port;
/* do syntatic check.
* We break the URL into host, port, path, search
*/
port = def_port;
err = proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
if (err) return BAD_REQUEST;
/* now parse path/search args, according to rfc1738 */
/* N.B. if this isn't a true proxy request, then the URL _path_
* has already been decoded
*/
if (r->proxyreq)
{
p = strchr(url, '?');
if (p != NULL) *(p++) = '\0';
} else
p = r->args;
/* process path */
path = proxy_canonenc(r->pool, url, strlen(url), enc_path, r->proxyreq);
if (path == NULL) return BAD_REQUEST;
/* process search */
if (p != NULL)
{
search = p;
if (search == NULL) return BAD_REQUEST;
} else
search = NULL;
if (port != def_port) ap_snprintf(sport, sizeof(sport), ":%d", port);
else sport[0] = '\0';
r->filename = pstrcat(r->pool, "proxy:", scheme, "://", host, sport, "/",
path, (search) ? "?" : "", (search) ? search : "", NULL);
return OK;
}
/* Clear all connection-based headers from the incoming headers table */
static void clear_connection (table *headers)
{
char *name;
char *next = table_get(headers, "Connection");
if (!next) return;
while (*next) {
name = next;
while (*next && !isspace(*next) && (*next != ',')) ++next;
while (*next && (isspace(*next) || (*next == ','))) {
*next = '\0';
++next;
}
table_unset(headers, name);
}
table_unset(headers, "Connection");
}
/*
* This handles http:// URLs, and other URLs using a remote proxy over http
* If proxyhost is NULL, then contact the server directly, otherwise
* go via the proxy.
* Note that if a proxy is used, then URLs other than http: can be accessed,
* also, if we have trouble which is clearly specific to the proxy, then
* we return DECLINED so that we can try another proxy. (Or the direct
* route.)
*/
int
proxy_http_handler(request_rec *r, struct cache_req *c, char *url,
const char *proxyhost, int proxyport)
{
char *p;
const char *err, *desthost;
int i, j, sock, len;
array_header *reqhdrs_arr, *resp_hdrs;
table_entry *reqhdrs;
struct sockaddr_in server;
struct in_addr destaddr;
struct hostent server_hp;
BUFF *f, *cache;
struct hdr_entry *hdr;
char buffer[HUGE_STRING_LEN], inprotocol[9], outprotocol[9];
pool *pool=r->pool;
const long int zero=0L;
int destport = 0;
char *destportstr = NULL;
void *sconf = r->server->module_config;
proxy_server_conf *conf =
(proxy_server_conf *)get_module_config(sconf, &proxy_module);
struct noproxy_entry *npent=(struct noproxy_entry *)conf->noproxies->elts;
struct nocache_entry *ncent=(struct nocache_entry *)conf->nocaches->elts;
int nocache = 0;
memset(&server, '\0', sizeof(server));
server.sin_family = AF_INET;
/* We break the URL into host, port, path-search */
url += 7; /* skip http:// */
destport = DEFAULT_PORT;
p = strchr(url, '/');
if (p == NULL)
{
desthost = pstrdup(pool, url);
url = "/";
} else
{
char *q = palloc(pool, p-url+1);
memcpy(q, url, p-url);
q[p-url] = '\0';
url = p;
desthost = q;
}
p = strchr(desthost, ':');
if (p != NULL)
{
*(p++) = '\0';
if (isdigit(*p))
{
destport = atoi(p);
destportstr = p;
}
}
/* check if ProxyBlock directive on this host */
destaddr.s_addr = inet_addr(desthost);
for (i=0; i < conf->noproxies->nelts; i++)
{
if ((npent[i].name != NULL && strstr(desthost, npent[i].name) != NULL)
|| destaddr.s_addr == npent[i].addr.s_addr || npent[i].name[0] == '*')
return proxyerror(r, "Connect to remote machine blocked");
}
if (proxyhost != NULL)
{
url = r->uri; /* restore original URL */
server.sin_port = htons(proxyport);
err = proxy_host2addr(proxyhost, &server_hp);
if (err != NULL) return DECLINED; /* try another */
} else
{
server.sin_port = htons(destport);
err = proxy_host2addr(desthost, &server_hp);
if (err != NULL) return proxyerror(r, err); /* give up */
}
sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1)
{
log_error("proxy: error creating socket", r->server);
return SERVER_ERROR;
}
note_cleanups_for_socket(pool, sock);
#ifdef SINIX_D_RESOLVER_BUG
{ struct in_addr *ip_addr = (struct in_addr *) *server_hp.h_addr_list;
for ( ; ip_addr->s_addr != 0; ++ip_addr) {
memcpy(&server.sin_addr, ip_addr, sizeof(struct in_addr));
i = proxy_doconnect(sock, &server, r);
if (i == 0)
break;
}
}
#else
j = 0;
while (server_hp.h_addr_list[j] != NULL) {
memcpy(&server.sin_addr, server_hp.h_addr_list[j],
sizeof(struct in_addr));
i = proxy_doconnect(sock, &server, r);
if (i == 0)
break;
j++;
}
#endif
if (i == -1)
{
if (proxyhost != NULL) return DECLINED; /* try again another way */
else return proxyerror(r, "Could not connect to remote machine");
}
clear_connection(r->headers_in); /* Strip connection-based headers */
f = bcreate(pool, B_RDWR | B_SOCKET);
bpushfd(f, sock, sock);
hard_timeout ("proxy send", r);
bvputs(f, r->method, " ", url, " HTTP/1.0\015\012", NULL);
bvputs(f, "Host: ", desthost, NULL);
if (destportstr != NULL && destport != DEFAULT_PORT)
bvputs(f, ":", destportstr, "\015\012", NULL);
else
bputs("\015\012", f);
reqhdrs_arr = table_elts (r->headers_in);
reqhdrs = (table_entry *)reqhdrs_arr->elts;
for (i=0; i < reqhdrs_arr->nelts; i++)
{
if (reqhdrs[i].key == NULL || reqhdrs[i].val == NULL
/* Clear out headers not to send */
|| !strcasecmp(reqhdrs[i].key, "Host") /* Already sent */
|| !strcasecmp(reqhdrs[i].key, "Proxy-Authorization"))
continue;
bvputs(f, reqhdrs[i].key, ": ", reqhdrs[i].val, "\015\012", NULL);
}
bputs("\015\012", f);
/* send the request data, if any. N.B. should we trap SIGPIPE ? */
if (should_client_block(r))
{
while ((i = get_client_block(r, buffer, HUGE_STRING_LEN)) > 0)
bwrite(f, buffer, i);
}
bflush(f);
kill_timeout(r);
hard_timeout ("proxy receive", r);
len = bgets(buffer, HUGE_STRING_LEN-1, f);
if (len == -1 || len == 0)
{
pclosesocket(pool, sock);
kill_timeout(r);
return proxyerror(r, "Error reading from remote server");
}
/* Is it an HTTP/1 response? */
if (checkmask(buffer, "HTTP/#.# ###*"))
{
/* If not an HTTP/1 messsage or if the status line was > 8192 bytes */
if (buffer[5] != '1' || buffer[len-1] != '\n')
{
pclosesocket(pool, sock);
kill_timeout(r);
return BAD_GATEWAY;
}
buffer[--len] = '\0';
memcpy(inprotocol, buffer, 8);
inprotocol[8] = '\0';
/* we use the same protocol on output as on input */
strcpy(outprotocol, inprotocol);
buffer[12] = '\0';
r->status = atoi(&buffer[9]);
buffer[12] = ' ';
r->status_line = pstrdup(pool, &buffer[9]);
/* read the headers. */
/* N.B. for HTTP/1.0 clients, we have to fold line-wrapped headers */
/* Also, take care with headers with multiple occurences. */
resp_hdrs = proxy_read_headers(pool, buffer, HUGE_STRING_LEN, f);
} else
{
/* an http/0.9 response */
strcpy(inprotocol, "HTTP/0.9");
strcpy(outprotocol, "HTTP/1.0");
r->status = 200;
r->status_line = "200 OK";
/* no headers */
resp_hdrs = make_array(pool, 2, sizeof(struct hdr_entry));
}
kill_timeout(r);
/*
* HTTP/1.0 requires us to accept 3 types of dates, but only generate
* one type
*/
hdr = (struct hdr_entry *)resp_hdrs->elts;
for (i=0; i < resp_hdrs->nelts; i++)
{
if (hdr[i].value[0] == '\0') continue;
p = hdr[i].field;
if (strcasecmp(p, "Date") == 0 ||
strcasecmp(p, "Last-Modified") == 0 ||
strcasecmp(p, "Expires") == 0)
hdr[i].value = proxy_date_canon(pool, hdr[i].value);
}
/* check if NoCache directive on this host */
for (i=0; i < conf->nocaches->nelts; i++)
{
if ((ncent[i].name != NULL && strstr(desthost, ncent[i].name) != NULL)
|| destaddr.s_addr == ncent[i].addr.s_addr || ncent[i].name[0] == '*')
nocache = 1;
}
i = proxy_cache_update(c, resp_hdrs, inprotocol, nocache);
if (i != DECLINED)
{
pclosesocket(pool, sock);
return i;
}
cache = c->fp;
hard_timeout ("proxy receive", r);
/* write status line */
if (!r->assbackwards)
rvputs(r, "HTTP/1.0 ", r->status_line, "\015\012", NULL);
if (cache != NULL)
if (bvputs(cache, outprotocol, " ", r->status_line, "\015\012", NULL)
== -1)
cache = proxy_cache_error(c);
/* send headers */
for (i=0; i < resp_hdrs->nelts; i++)
{
if (hdr[i].field == NULL || hdr[i].value == NULL ||
hdr[i].value[0] == '\0') continue;
if (!r->assbackwards)
rvputs(r, hdr[i].field, ": ", hdr[i].value, "\015\012", NULL);
if (cache != NULL)
if (bvputs(cache, hdr[i].field, ": ", hdr[i].value, "\015\012",
NULL) == -1)
cache = proxy_cache_error(c);
}
if (!r->assbackwards) rputs("\015\012", r);
if (cache != NULL)
if (bputs("\015\012", cache) == -1) cache = proxy_cache_error(c);
bsetopt(r->connection->client, BO_BYTECT, &zero);
r->sent_bodyct = 1;
/* Is it an HTTP/0.9 respose? If so, send the extra data */
if (strcmp(inprotocol, "HTTP/0.9") == 0)
{
bwrite(r->connection->client, buffer, len);
if (cache != NULL)
if (bwrite(f, buffer, len) != len) cache = proxy_cache_error(c);
}
kill_timeout(r);
/* send body */
/* if header only, then cache will be NULL */
/* HTTP/1.0 tells us to read to EOF, rather than content-length bytes */
if (!r->header_only) proxy_send_fb(f, r, cache, c);
proxy_cache_tidy(c);
pclosesocket(pool, sock);
proxy_garbage_coll(r);
return OK;
}
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