/* Copyright 1999-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* HTTP 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); typedef struct { const char *name; apr_port_t port; apr_sockaddr_t *addr; apr_socket_t *sock; int close; } proxy_http_conn_t; static apr_status_t ap_proxy_http_cleanup(request_rec *r, proxy_http_conn_t *p_conn, proxy_conn_rec *backend); /* * 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_port_of_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_port_of_scheme(scheme); ap_log_error(APLOG_MARK, APLOG_DEBUG, 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"); } static apr_status_t ap_proxy_http_determine_connection(apr_pool_t *p, request_rec *r, proxy_http_conn_t *p_conn, conn_rec *c, proxy_server_conf *conf, apr_uri_t *uri, char **url, const char *proxyname, apr_port_t proxyport, char *server_portstr, int server_portstr_size) { int server_port; apr_status_t err; apr_sockaddr_t *uri_addr; /* * 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(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_port_of_scheme(uri->scheme); } ap_log_error(APLOG_MARK, APLOG_DEBUG, 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) { p_conn->name = apr_pstrdup(c->pool, proxyname); p_conn->port = proxyport; /* see memory note above */ err = apr_sockaddr_info_get(&p_conn->addr, p_conn->name, APR_UNSPEC, p_conn->port, 0, c->pool); } else { p_conn->name = apr_pstrdup(c->pool, uri->hostname); p_conn->port = uri->port; p_conn->addr = uri_addr; *url = apr_pstrcat(p, uri->path, uri->query ? "?" : "", uri->query ? uri->query : "", uri->fragment ? "#" : "", uri->fragment ? uri->fragment : "", NULL); } if (err != APR_SUCCESS) { return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_pstrcat(p, "DNS lookup failure for: ", p_conn->name, NULL)); } /* Get the server port for the Via headers */ { server_port = ap_get_server_port(r); if (ap_is_default_port(server_port, r)) { strcpy(server_portstr,""); } else { apr_snprintf(server_portstr, server_portstr_size, ":%d", server_port); } } /* 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"); } return OK; } static apr_status_t ap_proxy_http_create_connection(apr_pool_t *p, request_rec *r, proxy_http_conn_t *p_conn, conn_rec *c, conn_rec **origin, proxy_conn_rec *backend, proxy_server_conf *conf, const char *proxyname) { int failed=0, new=0; apr_socket_t *client_socket = NULL; /* 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 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) { client_socket = ap_get_module_config(backend->connection->conn_config, &core_module); if ((backend->connection->id == c->id) && (backend->port == p_conn->port) && (backend->hostname) && (!apr_strnatcasecmp(backend->hostname, p_conn->name))) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: keepalive address match (keep original socket)"); } else { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: keepalive address mismatch / connection has" " changed (close old socket (%s/%s, %d/%d))", p_conn->name, backend->hostname, p_conn->port, backend->port); apr_socket_close(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)) { apr_size_t buffer_len = 1; char test_buffer[1]; apr_status_t socket_status; apr_interval_time_t current_timeout; /* use previous keepalive socket */ *origin = backend->connection; p_conn->sock = client_socket; new = 0; /* save timeout */ apr_socket_timeout_get(p_conn->sock, ¤t_timeout); /* set no timeout */ apr_socket_timeout_set(p_conn->sock, 0); socket_status = apr_recv(p_conn->sock, test_buffer, &buffer_len); /* put back old timeout */ apr_socket_timeout_set(p_conn->sock, current_timeout); if ( APR_STATUS_IS_EOF(socket_status) ) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, "proxy: HTTP: previous connection is closed"); new = 1; } } if (new) { /* create a new socket */ backend->connection = NULL; /* * 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 */ failed = ap_proxy_connect_to_backend(&p_conn->sock, "HTTP", p_conn->addr, p_conn->name, conf, r->server, c->pool); /* handle a permanent error on the connect */ if (failed) { if (proxyname) { return DECLINED; } else { return HTTP_BAD_GATEWAY; } } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: socket is connected"); /* the socket is now open, create a new backend server connection */ *origin = ap_run_create_connection(c->pool, r->server, p_conn->sock, r->connection->id, r->connection->sbh, c->bucket_alloc); if (!*origin) { /* the peer reset the connection already; ap_run_create_connection() * closed the socket */ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: an error occurred creating a " "new connection to %pI (%s)", p_conn->addr, p_conn->name); apr_socket_close(p_conn->sock); return HTTP_INTERNAL_SERVER_ERROR; } backend->connection = *origin; backend->hostname = apr_pstrdup(c->pool, p_conn->name); backend->port = p_conn->port; if (backend->is_ssl) { if (!ap_proxy_ssl_enable(backend->connection)) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server, "proxy: failed to enable ssl support " "for %pI (%s)", p_conn->addr, p_conn->name); return HTTP_INTERNAL_SERVER_ERROR; } } else { ap_proxy_ssl_disable(backend->connection); } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: connection complete to %pI (%s)", p_conn->addr, p_conn->name); /* set up the connection filters */ ap_run_pre_connection(*origin, p_conn->sock); } return OK; } static apr_status_t ap_proxy_http_request(apr_pool_t *p, request_rec *r, proxy_http_conn_t *p_conn, conn_rec *origin, proxy_server_conf *conf, apr_uri_t *uri, char *url, apr_bucket_brigade *bb, char *server_portstr) { conn_rec *c = r->connection; char *buf; apr_bucket *e; const apr_array_header_t *headers_in_array; const apr_table_entry_t *headers_in; int counter, seen_eos; apr_status_t status; /* * 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. */ p_conn->close += ap_proxy_liststr(apr_table_get(r->headers_in, "Connection"), "close"); /* sub-requests never use keepalives */ if (r->main) { p_conn->close++; } ap_proxy_clear_connection(p, r->headers_in); if (p_conn->close) { apr_table_setn(r->headers_in, "Connection", "close"); origin->keepalive = AP_CONN_CLOSE; } if ( apr_table_get(r->subprocess_env,"force-proxy-request-1.0")) { buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL); } else { buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL); } if ( apr_table_get(r->subprocess_env,"proxy-nokeepalive")) { apr_table_unset(r->headers_in, "Connection"); origin->keepalive = AP_CONN_CLOSE; } ap_xlate_proto_to_ascii(buf, strlen(buf)); e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, e); if ( conf->preserve_host == 0 ) { if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) { buf = apr_pstrcat(p, "Host: ", uri->hostname, ":", uri->port_str, CRLF, NULL); } else { buf = apr_pstrcat(p, "Host: ", uri->hostname, CRLF, NULL); } } else { /* don't want to use r->hostname, as the incoming header might have a * port attached */ const char* hostname = apr_table_get(r->headers_in,"Host"); if (!hostname) { hostname = r->server->server_hostname; ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, "proxy: no HTTP 0.9 request (with no host line) " "on incoming request and preserve host set " "forcing hostname to be %s for uri %s", hostname, r->uri ); } buf = apr_pstrcat(p, "Host: ", hostname, CRLF, NULL); } ap_xlate_proto_to_ascii(buf, strlen(buf)); e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); 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_mergen(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_mergen(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_mergen(r->headers_in, "X-Forwarded-Server", r->server->server_hostname); } /* send request headers */ proxy_run_fixups(r); headers_in_array = apr_table_elts(r->headers_in); headers_in = (const apr_table_entry_t *) headers_in_array->elts; for (counter = 0; counter < headers_in_array->nelts; counter++) { if (headers_in[counter].key == NULL || headers_in[counter].val == NULL /* Clear out hop-by-hop request headers not to send * RFC2616 13.5.1 says we should strip these headers */ /* Already sent */ || !apr_strnatcasecmp(headers_in[counter].key, "Host") || !apr_strnatcasecmp(headers_in[counter].key, "Keep-Alive") || !apr_strnatcasecmp(headers_in[counter].key, "TE") || !apr_strnatcasecmp(headers_in[counter].key, "Trailer") || !apr_strnatcasecmp(headers_in[counter].key, "Transfer-Encoding") || !apr_strnatcasecmp(headers_in[counter].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[counter].key,"Proxy-Authorization") || !apr_strnatcasecmp(headers_in[counter].key,"Proxy-Authenticate")) { continue; } /* for sub-requests, ignore freshness/expiry headers */ if (r->main) { if (headers_in[counter].key == NULL || headers_in[counter].val == NULL || !apr_strnatcasecmp(headers_in[counter].key, "If-Match") || !apr_strnatcasecmp(headers_in[counter].key, "If-Modified-Since") || !apr_strnatcasecmp(headers_in[counter].key, "If-Range") || !apr_strnatcasecmp(headers_in[counter].key, "If-Unmodified-Since") || !apr_strnatcasecmp(headers_in[counter].key, "If-None-Match")) { continue; } /* If you POST to a page that gets server-side parsed * by mod_include, and the parsing results in a reverse * proxy call, the proxied request will be a GET, but * its request_rec will have inherited the Content-Length * of the original request (the POST for the enclosing * page). We can't send the original POST's request body * as part of the proxied subrequest, so we need to avoid * sending the corresponding content length. Otherwise, * the server to which we're proxying will sit there * forever, waiting for a request body that will never * arrive. */ if ((r->method_number == M_GET) && headers_in[counter].key && !apr_strnatcasecmp(headers_in[counter].key, "Content-Length")) { continue; } } buf = apr_pstrcat(p, headers_in[counter].key, ": ", headers_in[counter].val, CRLF, NULL); ap_xlate_proto_to_ascii(buf, strlen(buf)); e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, e); } /* add empty line at the end of the headers */ #if APR_CHARSET_EBCDIC e = apr_bucket_immortal_create("\015\012", 2, c->bucket_alloc); #else e = apr_bucket_immortal_create(CRLF, sizeof(CRLF)-1, c->bucket_alloc); #endif APR_BRIGADE_INSERT_TAIL(bb, e); e = apr_bucket_flush_create(c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, e); status = ap_pass_brigade(origin->output_filters, bb); if (status != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, "proxy: request failed to %pI (%s)", p_conn->addr, p_conn->name); return status; } /* send the request data, if any. */ seen_eos = 0; do { status = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES, APR_BLOCK_READ, HUGE_STRING_LEN); if (status != APR_SUCCESS) { return status; } /* If this brigade contain EOS, either stop or remove it. */ if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) { /* As a shortcut, if this brigade is simply an EOS bucket, * don't send anything down the filter chain. */ if (APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(bb))) { break; } /* We can't pass this EOS to the output_filters. */ e = APR_BRIGADE_LAST(bb); apr_bucket_delete(e); seen_eos = 1; } e = apr_bucket_flush_create(c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, e); status = ap_pass_brigade(origin->output_filters, bb); if (status != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, "proxy: pass request data failed to %pI (%s)", p_conn->addr, p_conn->name); return status; } apr_brigade_cleanup(bb); } while (!seen_eos); return APR_SUCCESS; } static apr_status_t ap_proxy_http_process_response(apr_pool_t * p, request_rec *r, proxy_http_conn_t *p_conn, conn_rec *origin, proxy_conn_rec *backend, proxy_server_conf *conf, apr_bucket_brigade *bb, char *server_portstr) { conn_rec *c = r->connection; char buffer[HUGE_STRING_LEN]; char keepchar; request_rec *rp; apr_bucket *e; int len, backasswards; int received_continue = 1; /* flag to indicate if we should * loop over response parsing logic * in the case that the origin told us * to HTTP_CONTINUE */ /* Get response from the remote server, and pass it up the * filter chain */ rp = ap_proxy_make_fake_req(origin, r); /* In case anyone needs to know, this is a fake request that is really a * response. */ rp->proxyreq = PROXYREQ_RESPONSE; while (received_continue) { apr_brigade_cleanup(bb); len = ap_getline(buffer, sizeof(buffer), rp, 0); if (len == 0) { /* handle one potential stray CRLF */ len = ap_getline(buffer, sizeof(buffer), rp, 0); } if (len <= 0) { apr_socket_close(p_conn->sock); backend->connection = NULL; ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "proxy: error reading status line from remote " "server %s", p_conn->name); return ap_proxyerror(r, HTTP_BAD_GATEWAY, "Error reading from remote server"); } /* 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(p_conn->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; keepchar = buffer[12]; buffer[12] = '\0'; r->status = atoi(&buffer[9]); if (keepchar != '\0') { buffer[12] = keepchar; } else { /* 2616 requires the space in Status-Line; the origin * server may have sent one but ap_rgetline_core will * have stripped it. */ buffer[12] = ' '; buffer[13] = '\0'; } 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, 0, r->server, "proxy: bad HTTP/%d.%d header " "returned by %s (%s)", major, minor, r->uri, r->method); p_conn->close += 1; /* * ap_send_error relies on a headers_out to be present. we * are in a bad position here.. so force everything we send out * to have nothing to do with the incoming packet */ r->headers_out = apr_table_make(r->pool,1); r->status = HTTP_BAD_GATEWAY; r->status_line = "bad gateway"; return r->status; } else { /* strip connection listed hop-by-hop headers from response */ const char *buf; p_conn->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"))) { ap_set_content_type(r, apr_pstrdup(p, buf)); } ap_proxy_pre_http_request(origin,rp); } /* handle Via header in response */ if (conf->viaopt != via_off && conf->viaopt != via_block) { /* create a "Via:" response header entry and merge it */ apr_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)) { p_conn->close += 1; origin->keepalive = AP_CONN_CLOSE; } } else { /* an http/0.9 response */ backasswards = 1; r->status = 200; r->status_line = "200 OK"; p_conn->close += 1; } if ( r->status != HTTP_CONTINUE ) { received_continue = 0; } else { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, "proxy: HTTP: received 100 CONTINUE"); } /* 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)); } } if ((r->status == 401) && (conf->error_override != 0)) { const char *buf; const char *wa = "WWW-Authenticate"; if ((buf = apr_table_get(r->headers_out, wa))) { apr_table_set(r->err_headers_out, wa, buf); } else { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: origin server sent 401 without WWW-Authenticate header"); } } 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, NULL, c->bucket_alloc); 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 */ /* We need to copy the output headers and treat them as input * headers as well. BUT, we need to do this before we remove * TE, so that they are preserved accordingly for * ap_http_filter to know where to end. */ rp->headers_in = apr_table_copy(r->pool, r->headers_out); apr_table_unset(r->headers_out,"Transfer-Encoding"); ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: start body send"); /* * if we are overriding the errors, we can't put the content * of the page into the brigade */ if ( (conf->error_override ==0) || r->status < 400 ) { /* read the body, pass it to the output filters */ int finish = FALSE; while (ap_get_brigade(rp->input_filters, bb, AP_MODE_READBYTES, APR_BLOCK_READ, conf->io_buffer_size) == APR_SUCCESS) { #if DEBUGGING { apr_off_t readbytes; apr_brigade_length(bb, 0, &readbytes); ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy (PID %d): readbytes: %#x", getpid(), readbytes); } #endif /* sanity check */ if (APR_BRIGADE_EMPTY(bb)) { apr_brigade_cleanup(bb); break; } /* found the last brigade? */ if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) { /* if this is the last brigade, cleanup the * backend connection first to prevent the * backend server from hanging around waiting * for a slow client to eat these bytes */ ap_proxy_http_cleanup(r, p_conn, backend); /* signal that we must leave */ finish = TRUE; } /* try send what we read */ if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS) { /* Ack! Phbtt! Die! User aborted! */ p_conn->close = 1; /* this causes socket close below */ finish = TRUE; } /* make sure we always clean up after ourselves */ apr_brigade_cleanup(bb); /* if we are done, leave */ if (TRUE == finish) { break; } } } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: end body send"); } else { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: header only"); } } if ( conf->error_override ) { /* the code above this checks for 'OK' which is what the hook expects */ if ( r->status == HTTP_OK ) return OK; else { /* clear r->status for override error, otherwise ErrorDocument * thinks that this is a recursive error, and doesn't find the * custom error page */ int status = r->status; r->status = HTTP_OK; /* Discard body, if one is expected */ if ((status > 199) && /* not any 1xx response */ (status != HTTP_NO_CONTENT) && /* not 204 */ (status != HTTP_RESET_CONTENT) && /* not 205 */ (status != HTTP_NOT_MODIFIED)) { /* not 304 */ ap_discard_request_body(rp); } return status; } } else return OK; } static apr_status_t ap_proxy_http_cleanup(request_rec *r, proxy_http_conn_t *p_conn, proxy_conn_rec *backend) { /* 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 (p_conn->close || (r->proto_num < HTTP_VERSION(1,1))) { if (p_conn->sock) { apr_socket_close(p_conn->sock); p_conn->sock = NULL; backend->connection = NULL; } } return OK; } /* * 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) { int status; char server_portstr[32]; conn_rec *origin = NULL; proxy_conn_rec *backend = NULL; int is_ssl = 0; /* 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_brigade *bb = apr_brigade_create(p, c->bucket_alloc); apr_uri_t *uri = apr_palloc(r->connection->pool, sizeof(*uri)); proxy_http_conn_t *p_conn = apr_pcalloc(r->connection->pool, sizeof(*p_conn)); /* is it for us? */ if (strncasecmp(url, "https:", 6) == 0) { if (!ap_proxy_ssl_enable(NULL)) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: HTTPS: declining URL %s" " (mod_ssl not configured?)", url); return DECLINED; } is_ssl = 1; } else if (!(strncasecmp(url, "http:", 5)==0 || (strncasecmp(url, "ftp:", 4)==0 && proxyname))) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: HTTP: declining URL %s", url); return DECLINED; /* only interested in HTTP, or FTP via proxy */ } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: HTTP: serving URL %s", url); /* only use stored info for top-level pages. Sub requests don't share * in keepalives */ if (!r->main) { backend = (proxy_conn_rec *) ap_get_module_config(c->conn_config, &proxy_http_module); } /* create space for state information */ if (!backend) { backend = apr_pcalloc(c->pool, sizeof(proxy_conn_rec)); backend->connection = NULL; backend->hostname = NULL; backend->port = 0; if (!r->main) { ap_set_module_config(c->conn_config, &proxy_http_module, backend); } } backend->is_ssl = is_ssl; /* Step One: Determine Who To Connect To */ status = ap_proxy_http_determine_connection(p, r, p_conn, c, conf, uri, &url, proxyname, proxyport, server_portstr, sizeof(server_portstr)); if ( status != OK ) { return status; } /* Step Two: Make the Connection */ status = ap_proxy_http_create_connection(p, r, p_conn, c, &origin, backend, conf, proxyname); if ( status != OK ) { return status; } /* Step Three: Send the Request */ status = ap_proxy_http_request(p, r, p_conn, origin, conf, uri, url, bb, server_portstr); if ( status != OK ) { return status; } /* Step Four: Receive the Response */ status = ap_proxy_http_process_response(p, r, p_conn, origin, backend, conf, bb, server_portstr); if ( status != OK ) { /* clean up even if there is an error */ ap_proxy_http_cleanup(r, p_conn, backend); return status; } /* Step Five: Clean Up */ status = ap_proxy_http_cleanup(r, p_conn, backend); if ( status != OK ) { return status; } 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 */ };