| /* ==================================================================== |
| * 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. |
| */ |
| |
| /* HTTP routines for Apache proxy */ |
| |
| #include "mod_proxy.h" |
| |
| module AP_MODULE_DECLARE_DATA proxy_http_module; |
| |
| int ap_proxy_http_canon(request_rec *r, char *url); |
| int ap_proxy_http_handler(request_rec *r, proxy_server_conf *conf, |
| char *url, const char *proxyname, |
| apr_port_t proxyport); |
| |
| |
| /* |
| * 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 ap_proxy_http_canon(request_rec *r, char *url) |
| { |
| char *host, *path, *search, sport[7]; |
| const char *err; |
| const char *scheme; |
| apr_port_t port, def_port; |
| |
| /* ap_default_port_for_scheme() */ |
| if (strncasecmp(url, "http:", 5) == 0) { |
| url += 5; |
| scheme = "http"; |
| } |
| else if (strncasecmp(url, "https:", 6) == 0) { |
| url += 6; |
| scheme = "https:"; |
| } |
| else { |
| return DECLINED; |
| } |
| def_port = apr_uri_default_port_for_scheme(scheme); |
| |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: HTTP: canonicalising URL %s", url); |
| |
| /* do syntatic check. |
| * We break the URL into host, port, path, search |
| */ |
| port = def_port; |
| err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port); |
| if (err) |
| return HTTP_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. True proxy requests have r->uri |
| * == r->unparsed_uri, and no others have that property. |
| */ |
| if (r->uri == r->unparsed_uri) { |
| search = strchr(url, '?'); |
| if (search != NULL) |
| *(search++) = '\0'; |
| } |
| else |
| search = r->args; |
| |
| /* process path */ |
| path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, r->proxyreq); |
| if (path == NULL) |
| return HTTP_BAD_REQUEST; |
| |
| if (port != def_port) |
| apr_snprintf(sport, sizeof(sport), ":%d", port); |
| else |
| sport[0] = '\0'; |
| |
| r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport, "/", |
| path, (search) ? "?" : "", (search) ? search : "", NULL); |
| return OK; |
| } |
| |
| static const char *ap_proxy_location_reverse_map(request_rec *r, proxy_server_conf *conf, const char *url) |
| { |
| struct proxy_alias *ent; |
| int i, l1, l2; |
| char *u; |
| |
| /* XXX FIXME: Make sure this handled the ambiguous case of the :80 |
| * after the hostname */ |
| |
| l1 = strlen(url); |
| ent = (struct proxy_alias *)conf->raliases->elts; |
| for (i = 0; i < conf->raliases->nelts; i++) { |
| l2 = strlen(ent[i].real); |
| if (l1 >= l2 && strncmp(ent[i].real, url, l2) == 0) { |
| u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL); |
| return ap_construct_url(r->pool, u, r); |
| } |
| } |
| return url; |
| } |
| |
| /* Clear all connection-based headers from the incoming headers table */ |
| static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers) |
| { |
| const char *name; |
| char *next = apr_pstrdup(p, apr_table_get(headers, "Connection")); |
| |
| apr_table_unset(headers, "Proxy-Connection"); |
| if (!next) |
| return; |
| |
| while (*next) { |
| name = next; |
| while (*next && !apr_isspace(*next) && (*next != ',')) |
| ++next; |
| while (*next && (apr_isspace(*next) || (*next == ','))) { |
| *next = '\0'; |
| ++next; |
| } |
| apr_table_unset(headers, name); |
| } |
| apr_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 ap_proxy_http_handler(request_rec *r, proxy_server_conf *conf, |
| char *url, const char *proxyname, |
| apr_port_t proxyport) |
| { |
| request_rec *rp; |
| const char *connectname; |
| int connectport = 0; |
| apr_sockaddr_t *uri_addr; |
| apr_sockaddr_t *connect_addr; |
| char server_portstr[32]; |
| apr_socket_t *sock; |
| int i, len, backasswards, eos, close=0, failed=0, new=0; |
| apr_status_t err, rv; |
| apr_array_header_t *headers_in_array; |
| apr_table_entry_t *headers_in; |
| char buffer[HUGE_STRING_LEN]; |
| char *buf; |
| conn_rec *origin = NULL; |
| apr_uri_components uri; |
| proxy_conn_rec *backend; |
| |
| /* Note: Memory pool allocation. |
| * A downstream keepalive connection is always connected to the existence |
| * (or not) of an upstream keepalive connection. If this is not done then |
| * load balancing against multiple backend servers breaks (one backend |
| * server ends up taking 100% of the load), and the risk is run of |
| * downstream keepalive connections being kept open unnecessarily. This |
| * keeps webservers busy and ties up resources. |
| * |
| * As a result, we allocate all sockets out of the upstream connection |
| * pool, and when we want to reuse a socket, we check first whether the |
| * connection ID of the current upstream connection is the same as that |
| * of the connection when the socket was opened. |
| */ |
| apr_pool_t *p = r->connection->pool; |
| conn_rec *c = r->connection; |
| apr_bucket *e; |
| apr_bucket_brigade *bb = apr_brigade_create(p); |
| |
| /* is it for us? */ |
| if (strncasecmp(url, "http:", 5)) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: HTTP: rejecting URL %s", url); |
| return DECLINED; /* only interested in HTTP */ |
| } |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: HTTP: serving URL %s", url); |
| |
| /* create space for state information */ |
| backend = (proxy_conn_rec *) ap_get_module_config(c->conn_config, &proxy_http_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_http_module, backend); |
| } |
| |
| /* |
| * Step One: Determine Who To Connect To |
| * |
| * Break up the URL to determine the host to connect to |
| */ |
| |
| /* we break the URL into host, port, uri */ |
| if (APR_SUCCESS != apr_uri_parse_components(p, url, &uri)) { |
| return ap_proxyerror(r, HTTP_BAD_REQUEST, |
| apr_pstrcat(p,"URI cannot be parsed: ", url, NULL)); |
| } |
| if (!uri.port) { |
| uri.port = apr_uri_default_port_for_scheme(uri.scheme); |
| } |
| |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: HTTP connecting %s to %s:%d", url, uri.hostname, uri.port); |
| |
| /* do a DNS lookup for the destination host */ |
| /* see memory note above */ |
| err = apr_sockaddr_info_get(&uri_addr, apr_pstrdup(c->pool, uri.hostname), APR_UNSPEC, uri.port, 0, c->pool); |
| |
| /* allocate these out of the connection pool - the check on r->connection->id makes |
| * sure that this string does not get accessed past the connection lifetime */ |
| /* are we connecting directly, or via a proxy? */ |
| if (proxyname) { |
| connectname = apr_pstrdup(c->pool,proxyname); |
| connectport = proxyport; |
| /* see memory note above */ |
| err = apr_sockaddr_info_get(&connect_addr, connectname, APR_UNSPEC, connectport, 0, c->pool); |
| } |
| else { |
| connectname = apr_pstrdup(c->pool, uri.hostname); |
| connectport = uri.port; |
| connect_addr = uri_addr; |
| url = apr_pstrcat(p, uri.path, uri.query ? "?" : "", |
| uri.query ? uri.query : "", uri.fragment ? "#" : "", |
| uri.fragment ? uri.fragment : "", NULL); |
| } |
| |
| |
| /* Get the server port for the Via headers */ |
| { |
| i = ap_get_server_port(r); |
| if (ap_is_default_port(i,r)) { |
| strcpy(server_portstr,""); |
| } else { |
| apr_snprintf(server_portstr, sizeof server_portstr, ":%d", i); |
| } |
| } |
| |
| /* check if ProxyBlock directive on this host */ |
| if (OK != ap_proxy_checkproxyblock(r, conf, uri_addr)) { |
| return ap_proxyerror(r, HTTP_FORBIDDEN, |
| "Connect to remote machine blocked"); |
| } |
| |
| |
| /* |
| * Step Two: Make the Connection |
| * |
| * We have determined who to connect to. Now make the connection, supporting |
| * a KeepAlive 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 a keepalive socket is already open, check whether it must stay |
| * open, or whether it should be closed and a new socket created. |
| */ |
| /* see memory note above */ |
| if (backend->connection) { |
| if ((backend->connection->id == c->id) && |
| (backend->port == connectport) && |
| (backend->hostname) && |
| (!apr_strnatcasecmp(backend->hostname,connectname))) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: keepalive address match (keep original socket)"); |
| } |
| else { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: keepalive address mismatch / connection has" |
| " changed (close old socket (%s/%s, %d/%d))", |
| connectname, backend->hostname, |
| connectport, backend->port); |
| apr_socket_close(backend->connection->client_socket); |
| backend->connection = NULL; |
| } |
| } |
| |
| /* get a socket - either a keepalive one, or a new one */ |
| new = 1; |
| if ((backend->connection) && (backend->connection->id == c->id)) { |
| |
| /* use previous keepalive socket */ |
| origin = backend->connection; |
| sock = origin->client_socket; |
| new = 0; |
| |
| /* reset the connection filters */ |
| ap_proxy_reset_output_filters(origin); |
| |
| /* XXX FIXME: If the socket has since closed, change new to 1 so |
| * a new socket is opened */ |
| } |
| if (new) { |
| |
| /* create a new socket */ |
| backend->connection = NULL; |
| |
| /* see memory note above */ |
| if ((rv = apr_socket_create(&sock, APR_INET, SOCK_STREAM, c->pool)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server, |
| "proxy: 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 |
| |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: 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 */ |
| 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: 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) { |
| apr_socket_close(sock); |
| if (proxyname) { |
| return DECLINED; |
| } |
| else { |
| return HTTP_BAD_GATEWAY; |
| } |
| } |
| |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: socket is connected"); |
| |
| /* the socket is now open, create a new backend server connection */ |
| origin = ap_new_connection(c->pool, 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: an error occurred creating a new connection to %pI (%s)", connect_addr, connectname); |
| apr_socket_close(sock); |
| return HTTP_INTERNAL_SERVER_ERROR; |
| } |
| backend->connection = origin; |
| backend->hostname = apr_pstrdup(c->pool, connectname); |
| backend->port = connectport; |
| |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: connection complete"); |
| |
| /* set up the connection filters */ |
| ap_proxy_pre_http_connection(origin, NULL); |
| |
| } |
| |
| |
| /* |
| * Step Three: Send the Request |
| * |
| * Send the HTTP/1.1 request to the remote server |
| */ |
| |
| |
| /* strip connection listed hop-by-hop headers from the request */ |
| /* even though in theory a connection: close coming from the client |
| * should not affect the connection to the server, it's unlikely |
| * that subsequent client requests will hit this thread/process, so |
| * we cancel server keepalive if the client does. |
| */ |
| close += ap_proxy_liststr(apr_table_get(r->headers_in, "Connection"), "close"); |
| ap_proxy_clear_connection(p, r->headers_in); |
| if (close) { |
| apr_table_setn(r->headers_in, "Connection", "close"); |
| origin->keepalive = 0; |
| } |
| |
| buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL); |
| e = apr_bucket_pool_create(buf, strlen(buf), p); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| if (uri.port_str && uri.port != DEFAULT_HTTP_PORT) { |
| buf = apr_pstrcat(p, "Host: ", uri.hostname, ":", uri.port_str, CRLF, NULL); |
| e = apr_bucket_pool_create(buf, strlen(buf), p); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| } |
| else { |
| buf = apr_pstrcat(p, "Host: ", uri.hostname, CRLF, NULL); |
| e = apr_bucket_pool_create(buf, strlen(buf), p); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| } |
| |
| /* handle Via */ |
| if (conf->viaopt == via_block) { |
| /* Block all outgoing Via: headers */ |
| apr_table_unset(r->headers_in, "Via"); |
| } else if (conf->viaopt != via_off) { |
| /* Create a "Via:" request header entry and merge it */ |
| /* Generate outgoing Via: header with/without server comment: */ |
| apr_table_mergen(r->headers_in, "Via", |
| (conf->viaopt == via_full) |
| ? apr_psprintf(p, "%d.%d %s%s (%s)", |
| HTTP_VERSION_MAJOR(r->proto_num), |
| HTTP_VERSION_MINOR(r->proto_num), |
| ap_get_server_name(r), server_portstr, |
| AP_SERVER_BASEVERSION) |
| : apr_psprintf(p, "%d.%d %s%s", |
| HTTP_VERSION_MAJOR(r->proto_num), |
| HTTP_VERSION_MINOR(r->proto_num), |
| ap_get_server_name(r), server_portstr) |
| ); |
| } |
| |
| /* X-Forwarded-*: handling |
| * |
| * XXX Privacy Note: |
| * ----------------- |
| * |
| * These request headers are only really useful when the mod_proxy |
| * is used in a reverse proxy configuration, so that useful info |
| * about the client can be passed through the reverse proxy and on |
| * to the backend server, which may require the information to |
| * function properly. |
| * |
| * In a forward proxy situation, these options are a potential |
| * privacy violation, as information about clients behind the proxy |
| * are revealed to arbitrary servers out there on the internet. |
| * |
| * The HTTP/1.1 Via: header is designed for passing client |
| * information through proxies to a server, and should be used in |
| * a forward proxy configuation instead of X-Forwarded-*. See the |
| * ProxyVia option for details. |
| */ |
| |
| if (PROXYREQ_REVERSE == r->proxyreq) { |
| const char *buf; |
| |
| /* Add X-Forwarded-For: so that the upstream has a chance to |
| * determine, where the original request came from. |
| */ |
| apr_table_setn(r->headers_in, "X-Forwarded-For", r->connection->remote_ip); |
| |
| /* Add X-Forwarded-Host: so that upstream knows what the |
| * original request hostname was. |
| */ |
| if ((buf = apr_table_get(r->headers_in, "Host"))) { |
| apr_table_setn(r->headers_in, "X-Forwarded-Host", buf); |
| } |
| |
| /* Add X-Forwarded-Server: so that upstream knows what the |
| * name of this proxy server is (if there are more than one) |
| * XXX: This duplicates Via: - do we strictly need it? |
| */ |
| apr_table_setn(r->headers_in, "X-Forwarded-Server", |
| r->server->server_hostname); |
| } |
| |
| /* send request headers */ |
| headers_in_array = apr_table_elts(r->headers_in); |
| headers_in = (apr_table_entry_t *) headers_in_array->elts; |
| for (i = 0; i < headers_in_array->nelts; i++) { |
| if (headers_in[i].key == NULL || headers_in[i].val == NULL |
| |
| /* Clear out hop-by-hop request headers not to send |
| * RFC2616 13.5.1 says we should strip these headers |
| */ |
| || !apr_strnatcasecmp(headers_in[i].key, "Host") /* Already sent */ |
| || !apr_strnatcasecmp(headers_in[i].key, "Keep-Alive") |
| || !apr_strnatcasecmp(headers_in[i].key, "TE") |
| || !apr_strnatcasecmp(headers_in[i].key, "Trailer") |
| || !apr_strnatcasecmp(headers_in[i].key, "Transfer-Encoding") |
| || !apr_strnatcasecmp(headers_in[i].key, "Upgrade") |
| |
| /* XXX: @@@ FIXME: "Proxy-Authorization" should *only* be |
| * suppressed if THIS server requested the authentication, |
| * not when a frontend proxy requested it! |
| * |
| * The solution to this problem is probably to strip out |
| * the Proxy-Authorisation header in the authorisation |
| * code itself, not here. This saves us having to signal |
| * somehow whether this request was authenticated or not. |
| */ |
| || !apr_strnatcasecmp(headers_in[i].key, "Proxy-Authorization") |
| || !apr_strnatcasecmp(headers_in[i].key, "Proxy-Authenticate")) |
| continue; |
| |
| buf = apr_pstrcat(p, headers_in[i].key, ": ", headers_in[i].val, CRLF, NULL); |
| e = apr_bucket_pool_create(buf, strlen(buf), p); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| |
| } |
| |
| /* add empty line at the end of the headers */ |
| e = apr_bucket_pool_create(CRLF, strlen(CRLF), 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); |
| |
| /* send the request data, if any. */ |
| if (ap_should_client_block(r)) { |
| while ((i = ap_get_client_block(r, buffer, sizeof buffer)) > 0) { |
| e = apr_bucket_pool_create(buffer, i, 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); |
| apr_brigade_cleanup(bb); |
| } |
| } |
| |
| |
| /* |
| * Step Four: Receive the Response |
| * |
| * Get response from the remote server, and pass it up the |
| * filter chain |
| */ |
| |
| rp = make_fake_req(origin, r); |
| |
| apr_brigade_cleanup(bb); |
| |
| if (APR_SUCCESS != (rv = ap_proxy_string_read(origin, bb, buffer, sizeof(buffer), &eos))) { |
| apr_socket_close(sock); |
| backend->connection = NULL; |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, |
| "proxy: error reading status line from remote server %s", |
| connectname); |
| return ap_proxyerror(r, HTTP_BAD_GATEWAY, |
| "Error reading from remote server"); |
| } |
| len = strlen(buffer); |
| |
| /* Is it an HTTP/1 response? This is buggy if we ever see an HTTP/1.10 */ |
| if (apr_date_checkmask(buffer, "HTTP/#.# ###*")) { |
| int major, minor; |
| |
| if (2 != sscanf(buffer, "HTTP/%u.%u", &major, &minor)) { |
| major = 1; |
| minor = 1; |
| } |
| |
| /* If not an HTTP/1 message or if the status line was > 8192 bytes */ |
| else if ((buffer[5] != '1') || (len >= sizeof(buffer)-1)) { |
| apr_socket_close(sock); |
| backend->connection = NULL; |
| return ap_proxyerror(r, HTTP_BAD_GATEWAY, |
| apr_pstrcat(p, "Corrupt status line returned by remote server: ", buffer, NULL)); |
| } |
| backasswards = 0; |
| buffer[--len] = '\0'; |
| |
| buffer[12] = '\0'; |
| r->status = atoi(&buffer[9]); |
| |
| buffer[12] = ' '; |
| r->status_line = apr_pstrdup(p, &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. */ |
| |
| r->headers_out = ap_proxy_read_headers(r, rp, buffer, sizeof(buffer), origin); |
| if (r->headers_out == NULL) { |
| ap_log_error(APLOG_MARK, APLOG_WARNING|APLOG_NOERRNO, 0, r->server, |
| "proxy: bad HTTP/%d.%d header returned by %s (%s)", |
| major, minor, r->uri, r->method); |
| close += 1; |
| } |
| else |
| { |
| /* strip connection listed hop-by-hop headers from response */ |
| const char *buf; |
| close += ap_proxy_liststr(apr_table_get(r->headers_out, "Connection"), "close"); |
| ap_proxy_clear_connection(p, r->headers_out); |
| if ((buf = apr_table_get(r->headers_out, "Content-Type"))) { |
| r->content_type = apr_pstrdup(p, buf); |
| } |
| } |
| |
| /* handle Via header in response */ |
| if (conf->viaopt != via_off && conf->viaopt != via_block) { |
| /* create a "Via:" response header entry and merge it */ |
| ap_table_mergen(r->headers_out, "Via", |
| (conf->viaopt == via_full) |
| ? apr_psprintf(p, "%d.%d %s%s (%s)", |
| HTTP_VERSION_MAJOR(r->proto_num), |
| HTTP_VERSION_MINOR(r->proto_num), |
| ap_get_server_name(r), server_portstr, |
| AP_SERVER_BASEVERSION) |
| : apr_psprintf(p, "%d.%d %s%s", |
| HTTP_VERSION_MAJOR(r->proto_num), |
| HTTP_VERSION_MINOR(r->proto_num), |
| ap_get_server_name(r), server_portstr) |
| ); |
| } |
| |
| /* cancel keepalive if HTTP/1.0 or less */ |
| if ((major < 1) || (minor < 1)) { |
| close += 1; |
| origin->keepalive = 0; |
| } |
| } |
| else { |
| /* an http/0.9 response */ |
| backasswards = 1; |
| r->status = 200; |
| r->status_line = "200 OK"; |
| close += 1; |
| } |
| |
| /* we must accept 3 kinds of date, but generate only 1 kind of date */ |
| { |
| const char *buf; |
| if ((buf = apr_table_get(r->headers_out, "Date")) != NULL) { |
| apr_table_set(r->headers_out, "Date", ap_proxy_date_canon(p, buf)); |
| } |
| if ((buf = apr_table_get(r->headers_out, "Expires")) != NULL) { |
| apr_table_set(r->headers_out, "Expires", ap_proxy_date_canon(p, buf)); |
| } |
| if ((buf = apr_table_get(r->headers_out, "Last-Modified")) != NULL) { |
| apr_table_set(r->headers_out, "Last-Modified", ap_proxy_date_canon(p, buf)); |
| } |
| } |
| |
| /* munge the Location and URI response headers according to ProxyPassReverse */ |
| { |
| const char *buf; |
| if ((buf = apr_table_get(r->headers_out, "Location")) != NULL) { |
| apr_table_set(r->headers_out, "Location", ap_proxy_location_reverse_map(r, conf, buf)); |
| } |
| if ((buf = apr_table_get(r->headers_out, "Content-Location")) != NULL) { |
| apr_table_set(r->headers_out, "Content-Location", ap_proxy_location_reverse_map(r, conf, buf)); |
| } |
| if ((buf = apr_table_get(r->headers_out, "URI")) != NULL) { |
| apr_table_set(r->headers_out, "URI", ap_proxy_location_reverse_map(r, conf, buf)); |
| } |
| } |
| |
| r->sent_bodyct = 1; |
| /* Is it an HTTP/0.9 response? If so, send the extra data */ |
| if (backasswards) { |
| apr_ssize_t cntr = len; |
| e = apr_bucket_heap_create(buffer, cntr, 0, NULL); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| } |
| |
| /* send body - but only if a body is expected */ |
| if ((!r->header_only) && /* not HEAD request */ |
| (r->status > 199) && /* not any 1xx response */ |
| (r->status != HTTP_NO_CONTENT) && /* not 204 */ |
| (r->status != HTTP_RESET_CONTENT) && /* not 205 */ |
| (r->status != HTTP_NOT_MODIFIED)) { /* not 304 */ |
| |
| const char *buf; |
| apr_size_t readbytes; |
| |
| /* if chunked - insert DECHUNK filter */ |
| if (ap_proxy_liststr((buf = apr_table_get(r->headers_out, "Transfer-Encoding")), "chunked")) { |
| rp->read_chunked = 1; |
| apr_table_unset(r->headers_out, "Transfer-Encoding"); |
| if ((buf = ap_proxy_removestr(r->pool, buf, "chunked"))) { |
| apr_table_set(r->headers_out, "Transfer-Encoding", buf); |
| } |
| ap_add_input_filter("DECHUNK", NULL, rp, origin); |
| readbytes = -1; |
| } |
| |
| /* if content length - set the length to read */ |
| else if ((buf = apr_table_get(r->headers_out, "Content-Length"))) { |
| readbytes = atol(buf); |
| } |
| |
| /* no chunked / no length therefore read till EOF and cancel keepalive */ |
| else { |
| close += 1; |
| } |
| |
| /* if keepalive cancelled, read to EOF */ |
| if (close) { |
| readbytes = -1; |
| } |
| |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: start body send"); |
| |
| /* read the body, pass it to the output filters */ |
| while (ap_get_brigade(rp->input_filters, bb, AP_MODE_BLOCKING, &readbytes) == 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; |
| } |
| if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS) { |
| /* Ack! Phbtt! Die! User aborted! */ |
| close = 1; /* this causes socket close below */ |
| break; |
| } |
| apr_brigade_cleanup(bb); |
| } |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: end body send"); |
| } |
| else { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server, |
| "proxy: header only"); |
| } |
| |
| |
| /* |
| * Step Five: Clean Up |
| * |
| * If there are no KeepAlives, or if the connection has been signalled |
| * to close, close the socket and clean up |
| */ |
| |
| /* if the connection is < HTTP/1.1, or Connection: close, |
| * we close the socket, otherwise we leave it open for KeepAlive support |
| */ |
| if (close || (r->proto_num < HTTP_VERSION(1,1))) { |
| apr_socket_close(sock); |
| backend->connection = NULL; |
| } |
| |
| return OK; |
| } |
| |
| static void ap_proxy_http_register_hook(apr_pool_t *p) |
| { |
| proxy_hook_scheme_handler(ap_proxy_http_handler, NULL, NULL, APR_HOOK_FIRST); |
| proxy_hook_canon_handler(ap_proxy_http_canon, NULL, NULL, APR_HOOK_FIRST); |
| } |
| |
| module AP_MODULE_DECLARE_DATA proxy_http_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_http_register_hook /* register hooks */ |
| }; |
| |