| /* Copyright 1999-2005 The Apache Software Foundation or its licensors, as |
| * applicable. |
| * |
| * 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) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, |
| "error parsing URL %s: %s", |
| url, 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'; |
| |
| if (ap_strchr_c(host, ':')) { /* if literal IPv6 address */ |
| host = apr_pstrcat(r->pool, "[", host, "]", NULL); |
| } |
| 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_INFO, 0, NULL, |
| "proxy: previous connection is closed, creating a new connection."); |
| new = 1; |
| } |
| } |
| if (new) { |
| int rc; |
| |
| /* 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 */ |
| rc = ap_run_pre_connection(*origin, p_conn->sock); |
| if (rc != OK && rc != DONE) { |
| (*origin)->aborted = 1; |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, |
| "proxy: HTTP: pre_connection setup failed (%d)", |
| rc); |
| return rc; |
| } |
| } |
| return OK; |
| } |
| |
| static void add_te_chunked(apr_pool_t *p, |
| apr_bucket_alloc_t *bucket_alloc, |
| apr_bucket_brigade *header_brigade) |
| { |
| apr_bucket *e; |
| char *buf; |
| const char te_hdr[] = "Transfer-Encoding: chunked" CRLF; |
| |
| buf = apr_pmemdup(p, te_hdr, sizeof(te_hdr)-1); |
| ap_xlate_proto_to_ascii(buf, sizeof(te_hdr)-1); |
| |
| e = apr_bucket_pool_create(buf, sizeof(te_hdr)-1, p, bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(header_brigade, e); |
| } |
| |
| static void add_cl(apr_pool_t *p, |
| apr_bucket_alloc_t *bucket_alloc, |
| apr_bucket_brigade *header_brigade, |
| const char *cl_val) |
| { |
| apr_bucket *e; |
| char *buf; |
| |
| buf = apr_pstrcat(p, "Content-Length: ", |
| cl_val, |
| CRLF, |
| NULL); |
| ap_xlate_proto_to_ascii(buf, strlen(buf)); |
| e = apr_bucket_pool_create(buf, strlen(buf), p, bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(header_brigade, e); |
| } |
| |
| #define ASCII_CRLF "\015\012" |
| #define ASCII_ZERO "\060" |
| |
| static void terminate_headers(apr_bucket_alloc_t *bucket_alloc, |
| apr_bucket_brigade *header_brigade) |
| { |
| apr_bucket *e; |
| |
| /* add empty line at the end of the headers */ |
| e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(header_brigade, e); |
| } |
| |
| static apr_status_t pass_brigade(apr_bucket_alloc_t *bucket_alloc, |
| request_rec *r, proxy_http_conn_t *p_conn, |
| conn_rec *origin, apr_bucket_brigade *bb, |
| int flush) |
| { |
| apr_status_t status; |
| |
| if (flush) { |
| apr_bucket *e = apr_bucket_flush_create(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 body failed to %pI (%s)", |
| p_conn->addr, p_conn->name); |
| return status; |
| } |
| apr_brigade_cleanup(bb); |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t stream_reqbody_chunked(apr_pool_t *p, |
| request_rec *r, |
| proxy_http_conn_t *p_conn, |
| conn_rec *origin, |
| apr_bucket_brigade *header_brigade, |
| apr_bucket_brigade *input_brigade) |
| { |
| int seen_eos = 0; |
| apr_size_t hdr_len; |
| apr_off_t bytes; |
| apr_status_t status; |
| apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc; |
| apr_bucket_brigade *bb; |
| apr_bucket *e; |
| |
| add_te_chunked(p, bucket_alloc, header_brigade); |
| terminate_headers(bucket_alloc, header_brigade); |
| |
| while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade))) |
| { |
| char chunk_hdr[20]; /* must be here due to transient bucket. */ |
| |
| /* If this brigade contains EOS, either stop or remove it. */ |
| if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { |
| seen_eos = 1; |
| |
| /* We can't pass this EOS to the output_filters. */ |
| e = APR_BRIGADE_LAST(input_brigade); |
| apr_bucket_delete(e); |
| } |
| |
| apr_brigade_length(input_brigade, 1, &bytes); |
| |
| hdr_len = apr_snprintf(chunk_hdr, sizeof(chunk_hdr), |
| "%" APR_UINT64_T_HEX_FMT CRLF, |
| (apr_uint64_t)bytes); |
| |
| ap_xlate_proto_to_ascii(chunk_hdr, hdr_len); |
| e = apr_bucket_transient_create(chunk_hdr, hdr_len, |
| bucket_alloc); |
| APR_BRIGADE_INSERT_HEAD(input_brigade, e); |
| |
| /* |
| * Append the end-of-chunk CRLF |
| */ |
| e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(input_brigade, e); |
| |
| if (header_brigade) { |
| /* we never sent the header brigade, so go ahead and |
| * take care of that now |
| */ |
| bb = header_brigade; |
| APR_BRIGADE_CONCAT(bb, input_brigade); |
| header_brigade = NULL; |
| } |
| else { |
| bb = input_brigade; |
| } |
| |
| /* The request is flushed below this loop with chunk EOS header */ |
| status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 0); |
| if (status != APR_SUCCESS) { |
| return status; |
| } |
| |
| if (seen_eos) { |
| break; |
| } |
| |
| status = ap_get_brigade(r->input_filters, input_brigade, |
| AP_MODE_READBYTES, APR_BLOCK_READ, |
| HUGE_STRING_LEN); |
| |
| if (status != APR_SUCCESS) { |
| return status; |
| } |
| } |
| |
| if (header_brigade) { |
| /* we never sent the header brigade because there was no request body; |
| * send it now |
| */ |
| bb = header_brigade; |
| } |
| else { |
| if (!APR_BRIGADE_EMPTY(input_brigade)) { |
| /* input brigade still has an EOS which we can't pass to the output_filters. */ |
| e = APR_BRIGADE_LAST(input_brigade); |
| AP_DEBUG_ASSERT(APR_BUCKET_IS_EOS(e)); |
| apr_bucket_delete(e); |
| } |
| bb = input_brigade; |
| } |
| |
| e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF |
| /* <trailers> */ |
| ASCII_CRLF, |
| 5, bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| |
| /* Now we have headers-only, or the chunk EOS mark; flush it */ |
| status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1); |
| return status; |
| } |
| |
| static apr_status_t stream_reqbody_cl(apr_pool_t *p, |
| request_rec *r, |
| proxy_http_conn_t *p_conn, |
| conn_rec *origin, |
| apr_bucket_brigade *header_brigade, |
| apr_bucket_brigade *input_brigade, |
| const char *old_cl_val) |
| { |
| int seen_eos = 0; |
| apr_status_t status; |
| apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc; |
| apr_bucket_brigade *bb; |
| apr_bucket *e; |
| apr_off_t cl_val = 0; |
| apr_off_t bytes; |
| apr_off_t bytes_streamed = 0; |
| |
| if (old_cl_val) { |
| add_cl(p, bucket_alloc, header_brigade, old_cl_val); |
| cl_val = atol(old_cl_val); |
| } |
| terminate_headers(bucket_alloc, header_brigade); |
| |
| while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade))) |
| { |
| apr_brigade_length(input_brigade, 1, &bytes); |
| bytes_streamed += bytes; |
| |
| /* If this brigade contains EOS, either stop or remove it. */ |
| if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { |
| seen_eos = 1; |
| |
| /* We can't pass this EOS to the output_filters. */ |
| e = APR_BRIGADE_LAST(input_brigade); |
| apr_bucket_delete(e); |
| } |
| |
| /* C-L < bytes streamed?!? |
| * We will error out after the body is completely |
| * consumed, but we can't stream more bytes at the |
| * back end since they would in part be interpreted |
| * as another request! If nothing is sent, then |
| * just send nothing. |
| * |
| * Prevents HTTP Response Splitting. |
| */ |
| if (bytes_streamed > cl_val) |
| continue; |
| |
| if (header_brigade) { |
| /* we never sent the header brigade, so go ahead and |
| * take care of that now |
| */ |
| bb = header_brigade; |
| APR_BRIGADE_CONCAT(bb, input_brigade); |
| header_brigade = NULL; |
| } |
| else { |
| bb = input_brigade; |
| } |
| |
| /* Once we hit EOS, we are ready to flush. */ |
| status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, seen_eos); |
| if (status != APR_SUCCESS) { |
| return status; |
| } |
| |
| if (seen_eos) { |
| break; |
| } |
| |
| status = ap_get_brigade(r->input_filters, input_brigade, |
| AP_MODE_READBYTES, APR_BLOCK_READ, |
| HUGE_STRING_LEN); |
| |
| if (status != APR_SUCCESS) { |
| return status; |
| } |
| } |
| |
| if (bytes_streamed != cl_val) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server, |
| "proxy: client %s given Content-Length did not match" |
| " number of body bytes read", r->connection->remote_ip); |
| return APR_EOF; |
| } |
| |
| if (header_brigade) { |
| /* we never sent the header brigade since there was no request |
| * body; send it now with the flush flag |
| */ |
| bb = header_brigade; |
| status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1); |
| } |
| return status; |
| } |
| |
| #define MAX_MEM_SPOOL 16384 |
| |
| static apr_status_t spool_reqbody_cl(apr_pool_t *p, |
| request_rec *r, |
| proxy_http_conn_t *p_conn, |
| conn_rec *origin, |
| apr_bucket_brigade *header_brigade, |
| apr_bucket_brigade *input_brigade, |
| int force_cl) |
| { |
| int seen_eos = 0; |
| apr_status_t status; |
| apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc; |
| apr_bucket_brigade *body_brigade; |
| apr_bucket *e; |
| apr_off_t bytes, bytes_spooled = 0, fsize = 0; |
| apr_file_t *tmpfile = NULL; |
| |
| body_brigade = apr_brigade_create(p, bucket_alloc); |
| |
| while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade))) |
| { |
| /* If this brigade contains EOS, either stop or remove it. */ |
| if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { |
| seen_eos = 1; |
| |
| /* We can't pass this EOS to the output_filters. */ |
| e = APR_BRIGADE_LAST(input_brigade); |
| apr_bucket_delete(e); |
| } |
| |
| apr_brigade_length(input_brigade, 1, &bytes); |
| |
| if (bytes_spooled + bytes > MAX_MEM_SPOOL) { |
| /* can't spool any more in memory; write latest brigade to disk */ |
| if (tmpfile == NULL) { |
| const char *temp_dir; |
| char *template; |
| |
| status = apr_temp_dir_get(&temp_dir, p); |
| if (status != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, |
| "proxy: search for temporary directory failed"); |
| return status; |
| } |
| apr_filepath_merge(&template, temp_dir, |
| "modproxy.tmp.XXXXXX", |
| APR_FILEPATH_NATIVE, p); |
| status = apr_file_mktemp(&tmpfile, template, 0, p); |
| if (status != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, |
| "proxy: creation of temporary file in directory %s failed", |
| temp_dir); |
| return status; |
| } |
| } |
| for (e = APR_BRIGADE_FIRST(input_brigade); |
| e != APR_BRIGADE_SENTINEL(input_brigade); |
| e = APR_BUCKET_NEXT(e)) { |
| const char *data; |
| apr_size_t bytes_read, bytes_written; |
| |
| apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ); |
| status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written); |
| if (status != APR_SUCCESS) { |
| const char *tmpfile_name; |
| |
| if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) { |
| tmpfile_name = "(unknown)"; |
| } |
| ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, |
| "proxy: write to temporary file %s failed", |
| tmpfile_name); |
| return status; |
| } |
| AP_DEBUG_ASSERT(bytes_read == bytes_written); |
| fsize += bytes_written; |
| } |
| apr_brigade_cleanup(input_brigade); |
| } |
| else { |
| APR_BRIGADE_CONCAT(body_brigade, input_brigade); |
| } |
| |
| bytes_spooled += bytes; |
| |
| if (seen_eos) { |
| break; |
| } |
| |
| status = ap_get_brigade(r->input_filters, input_brigade, |
| AP_MODE_READBYTES, APR_BLOCK_READ, |
| HUGE_STRING_LEN); |
| |
| if (status != APR_SUCCESS) { |
| return status; |
| } |
| } |
| |
| if (bytes_spooled || force_cl) { |
| add_cl(p, bucket_alloc, header_brigade, apr_off_t_toa(p, bytes_spooled)); |
| } |
| terminate_headers(bucket_alloc, header_brigade); |
| APR_BRIGADE_CONCAT(header_brigade, body_brigade); |
| if (tmpfile) { |
| /* For platforms where the size of the file may be larger than |
| * that which can be stored in a single bucket (where the |
| * length field is an apr_size_t), split it into several |
| * buckets: */ |
| if (sizeof(apr_off_t) > sizeof(apr_size_t) |
| && fsize > AP_MAX_SENDFILE) { |
| e = apr_bucket_file_create(tmpfile, 0, AP_MAX_SENDFILE, p, |
| bucket_alloc); |
| while (fsize > AP_MAX_SENDFILE) { |
| apr_bucket *ce; |
| apr_bucket_copy(e, &ce); |
| APR_BRIGADE_INSERT_TAIL(header_brigade, ce); |
| e->start += AP_MAX_SENDFILE; |
| fsize -= AP_MAX_SENDFILE; |
| } |
| e->length = (apr_size_t)fsize; /* Resize just the last bucket */ |
| } |
| else { |
| e = apr_bucket_file_create(tmpfile, 0, (apr_size_t)fsize, p, |
| bucket_alloc); |
| } |
| APR_BRIGADE_INSERT_TAIL(header_brigade, e); |
| } |
| /* This is all a single brigade, pass with flush flagged */ |
| status = pass_brigade(bucket_alloc, r, p_conn, origin, header_brigade, 1); |
| return status; |
| } |
| |
| 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 *header_brigade, |
| char *server_portstr) |
| { |
| conn_rec *c = r->connection; |
| apr_bucket_alloc_t *bucket_alloc = c->bucket_alloc; |
| apr_bucket_brigade *input_brigade; |
| apr_bucket_brigade *temp_brigade; |
| apr_bucket *e; |
| char *buf; |
| const apr_array_header_t *headers_in_array; |
| const apr_table_entry_t *headers_in; |
| int counter; |
| apr_status_t status; |
| enum rb_methods {RB_INIT, RB_STREAM_CL, RB_STREAM_CHUNKED, RB_SPOOL_CL}; |
| enum rb_methods rb_method = RB_INIT; |
| const char *old_cl_val = NULL; |
| const char *old_te_val = NULL; |
| apr_off_t bytes_read = 0; |
| apr_off_t bytes; |
| int force10; |
| |
| /* |
| * 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. |
| */ |
| if (ap_proxy_liststr(apr_table_get(r->headers_in, |
| "Connection"), "close")) { |
| p_conn->close++; |
| /* XXX: we are abusing r->headers_in rather than a copy, |
| * give the core output handler a clue the client would |
| * rather just close. |
| */ |
| c->keepalive = AP_CONN_CLOSE; |
| } |
| ap_proxy_clear_connection(p, r->headers_in); |
| |
| if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) { |
| buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL); |
| force10 = 1; |
| p_conn->close++; |
| } else { |
| buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL); |
| force10 = 0; |
| } |
| if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) { |
| origin->keepalive = AP_CONN_CLOSE; |
| p_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(header_brigade, 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(header_brigade, 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 |
| |
| /* Already sent */ |
| || !strcasecmp(headers_in[counter].key, "Host") |
| |
| /* Clear out hop-by-hop request headers not to send |
| * RFC2616 13.5.1 says we should strip these headers |
| */ |
| || !strcasecmp(headers_in[counter].key, "Keep-Alive") |
| || !strcasecmp(headers_in[counter].key, "TE") |
| || !strcasecmp(headers_in[counter].key, "Trailer") |
| || !strcasecmp(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. |
| */ |
| || !strcasecmp(headers_in[counter].key,"Proxy-Authorization") |
| || !strcasecmp(headers_in[counter].key,"Proxy-Authenticate")) { |
| continue; |
| } |
| |
| /* Skip Transfer-Encoding and Content-Length for now. |
| */ |
| if (!strcasecmp(headers_in[counter].key, "Transfer-Encoding")) { |
| old_te_val = headers_in[counter].val; |
| continue; |
| } |
| if (!strcasecmp(headers_in[counter].key, "Content-Length")) { |
| old_cl_val = headers_in[counter].val; |
| continue; |
| } |
| |
| /* for sub-requests, ignore freshness/expiry headers */ |
| if (r->main) { |
| if ( !strcasecmp(headers_in[counter].key, "If-Match") |
| || !strcasecmp(headers_in[counter].key, "If-Modified-Since") |
| || !strcasecmp(headers_in[counter].key, "If-Range") |
| || !strcasecmp(headers_in[counter].key, "If-Unmodified-Since") |
| || !strcasecmp(headers_in[counter].key, "If-None-Match")) { |
| 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(header_brigade, e); |
| } |
| |
| /* We have headers, let's figure out our request body... */ |
| input_brigade = apr_brigade_create(p, bucket_alloc); |
| |
| /* sub-requests never use keepalives, and mustn't pass request bodies. |
| * Because the new logic looks at input_brigade, we will self-terminate |
| * input_brigade and jump past all of the request body logic... |
| * Reading anything with ap_get_brigade is likely to consume the |
| * main request's body or read beyond EOS - which would be unplesant. |
| */ |
| if (r->main) { |
| p_conn->close++; |
| if (old_cl_val) { |
| old_cl_val = NULL; |
| apr_table_unset(r->headers_in, "Content-Length"); |
| } |
| if (old_te_val) { |
| old_te_val = NULL; |
| apr_table_unset(r->headers_in, "Transfer-Encoding"); |
| } |
| rb_method = RB_STREAM_CL; |
| e = apr_bucket_eos_create(input_brigade->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(input_brigade, e); |
| goto skip_body; |
| } |
| |
| /* WE only understand chunked. Other modules might inject |
| * (and therefore, decode) other flavors but we don't know |
| * that the can and have done so unless they they remove |
| * their decoding from the headers_in T-E list. |
| * XXX: Make this extensible, but in doing so, presume the |
| * encoding has been done by the extensions' handler, and |
| * do not modify add_te_chunked's logic |
| */ |
| if (old_te_val && strcmp(old_te_val, "chunked") != 0) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server, |
| "proxy: %s Transfer-Encoding is not supported", |
| old_te_val); |
| return APR_EINVAL; |
| } |
| |
| if (old_cl_val && old_te_val) { |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_ENOTIMPL, r->server, |
| "proxy: client %s (%s) requested Transfer-Encoding body" |
| " with Content-Length (C-L ignored)", |
| c->remote_ip, c->remote_host ? c->remote_host: ""); |
| apr_table_unset(r->headers_in, "Content-Length"); |
| old_cl_val = NULL; |
| origin->keepalive = AP_CONN_CLOSE; |
| p_conn->close++; |
| } |
| |
| /* Prefetch MAX_MEM_SPOOL bytes |
| * |
| * This helps us avoid any election of C-L v.s. T-E |
| * request bodies, since we are willing to keep in |
| * memory this much data, in any case. This gives |
| * us an instant C-L election if the body is of some |
| * reasonable size. |
| */ |
| temp_brigade = apr_brigade_create(p, bucket_alloc); |
| do { |
| status = ap_get_brigade(r->input_filters, temp_brigade, |
| AP_MODE_READBYTES, APR_BLOCK_READ, |
| MAX_MEM_SPOOL - bytes_read); |
| if (status != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, |
| "proxy: prefetch request body failed to %s" |
| " from %s (%s)", |
| p_conn->name ? p_conn->name: "", |
| c->remote_ip, c->remote_host ? c->remote_host: ""); |
| return status; |
| } |
| |
| apr_brigade_length(temp_brigade, 1, &bytes); |
| APR_BRIGADE_CONCAT(input_brigade, temp_brigade); |
| bytes_read += bytes; |
| |
| /* Ensure we don't hit a wall where we have a buffer too small |
| * for ap_get_brigade's filters to fetch us another bucket, |
| * surrender once we hit 80 bytes less than MAX_MEM_SPOOL |
| * (an arbitrary value.) |
| */ |
| } while ((bytes_read < MAX_MEM_SPOOL - 80) |
| && !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))); |
| |
| /* Use chunked request body encoding or send a content-length body? |
| * |
| * Prefer C-L when: |
| * |
| * We have no request body (handled by RB_STREAM_CL) |
| * |
| * We have a request body length <= MAX_MEM_SPOOL |
| * |
| * The administrator has setenv force-proxy-request-1.0 |
| * |
| * The client sent a C-L body, and the administrator has |
| * not setenv proxy-sendchunked or has set setenv proxy-sendcl |
| * |
| * The client sent a T-E body, and the administrator has |
| * setenv proxy-sendcl, and not setenv proxy-sendchunked |
| * |
| * If both proxy-sendcl and proxy-sendchunked are set, the |
| * behavior is the same as if neither were set, large bodies |
| * that can't be read will be forwarded in their original |
| * form of C-L, or T-E. |
| * |
| * To ensure maximum compatibility, setenv proxy-sendcl |
| * To reduce server resource use, setenv proxy-sendchunked |
| * |
| * Then address specific servers with conditional setenv |
| * options to restore the default behavior where desireable. |
| * |
| * We have to compute content length by reading the entire request |
| * body; if request body is not small, we'll spool the remaining |
| * input to a temporary file. Chunked is always preferable. |
| * |
| * We can only trust the client-provided C-L if the T-E header |
| * is absent, and the filters are unchanged (the body won't |
| * be resized by another content filter). |
| */ |
| if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { |
| /* The whole thing fit, so our decision is trivial, use |
| * the filtered bytes read from the client for the request |
| * body Content-Length. |
| * |
| * If we expected no body, and read no body, do not set |
| * the Content-Length. |
| */ |
| if (old_cl_val || old_te_val || bytes_read) { |
| old_cl_val = apr_off_t_toa(r->pool, bytes_read); |
| } |
| rb_method = RB_STREAM_CL; |
| } |
| else if (old_te_val) { |
| if (force10 |
| || (apr_table_get(r->subprocess_env, "proxy-sendcl") |
| && !apr_table_get(r->subprocess_env, "proxy-sendchunks"))) { |
| rb_method = RB_SPOOL_CL; |
| } |
| else { |
| rb_method = RB_STREAM_CHUNKED; |
| } |
| } |
| else if (old_cl_val) { |
| if (r->input_filters == r->proto_input_filters) { |
| rb_method = RB_STREAM_CL; |
| } |
| else if (!force10 |
| && apr_table_get(r->subprocess_env, "proxy-sendchunks") |
| && !apr_table_get(r->subprocess_env, "proxy-sendcl")) { |
| rb_method = RB_STREAM_CHUNKED; |
| } |
| else { |
| rb_method = RB_SPOOL_CL; |
| } |
| } |
| else { |
| /* This is an appropriate default; very efficient for no-body |
| * requests, and has the behavior that it will not add any C-L |
| * when the old_cl_val is NULL. |
| */ |
| rb_method = RB_SPOOL_CL; |
| } |
| |
| /* Yes I hate gotos. This is the subrequest shortcut */ |
| skip_body: |
| /* Handle Connection: header */ |
| if (!force10 && p_conn->close) { |
| buf = apr_pstrdup(p, "Connection: close" CRLF); |
| ap_xlate_proto_to_ascii(buf, strlen(buf)); |
| e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(header_brigade, e); |
| } |
| |
| /* send the request body, if any. */ |
| switch(rb_method) { |
| case RB_STREAM_CHUNKED: |
| status = stream_reqbody_chunked(p, r, p_conn, origin, header_brigade, |
| input_brigade); |
| break; |
| case RB_STREAM_CL: |
| status = stream_reqbody_cl(p, r, p_conn, origin, header_brigade, |
| input_brigade, old_cl_val); |
| break; |
| case RB_SPOOL_CL: |
| status = spool_reqbody_cl(p, r, p_conn, origin, header_brigade, |
| input_brigade, (old_cl_val != NULL) |
| || (old_te_val != NULL) |
| || (bytes_read > 0)); |
| break; |
| default: |
| ap_assert(1 != 1); |
| break; |
| } |
| |
| if (status != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, |
| "proxy: pass request body failed to %pI (%s)" |
| " from %s (%s)", |
| p_conn->addr, p_conn->name ? p_conn->name: "", |
| c->remote_ip, c->remote_host ? c->remote_host: ""); |
| return status; |
| } |
| |
| 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]; |
| const char *buf; |
| 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; |
| } |
| |
| /* can't have both Content-Length and Transfer-Encoding */ |
| if (apr_table_get(r->headers_out, "Transfer-Encoding") |
| && apr_table_get(r->headers_out, "Content-Length")) { |
| /* 2616 section 4.4, point 3: "if both Transfer-Encoding |
| * and Content-Length are received, the latter MUST be |
| * ignored"; so unset it here to prevent any confusion |
| * later. */ |
| apr_table_unset(r->headers_out, "Content-Length"); |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, |
| r->server, |
| "proxy: server %s returned Transfer-Encoding and Content-Length", |
| p_conn->name); |
| p_conn->close += 1; |
| } |
| |
| /* strip connection listed hop-by-hop headers from response */ |
| 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 */ |
| 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 |
| */ |
| 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 *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 |
| || c->aborted) { |
| /* 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 */ |
| }; |
| |