/* ==================================================================== * 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 * . * * 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, APR_NO_INHERIT, 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 */ };