diff options
Diffstat (limited to 'rubbos/app/httpd-2.0.64/modules/proxy/proxy_http.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/modules/proxy/proxy_http.c | 1824 |
1 files changed, 1824 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/modules/proxy/proxy_http.c b/rubbos/app/httpd-2.0.64/modules/proxy/proxy_http.c new file mode 100644 index 00000000..ca5f038b --- /dev/null +++ b/rubbos/app/httpd-2.0.64/modules/proxy/proxy_http.c @@ -0,0 +1,1824 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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; + + /* + * Save input_brigade in bb brigade. (At least) in the SSL case + * input_brigade contains transient buckets whose data would get + * overwritten during the next call of ap_get_brigade in the loop. + * ap_save_brigade ensures these buckets to be set aside. + * Calling ap_save_brigade with NULL as filter is OK, because + * bb brigade already has been created and does not need to get + * created by ap_save_brigade. + */ + status = ap_save_brigade(NULL, &bb, &input_brigade, p); + if (status != APR_SUCCESS) { + return status; + } + + 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_SUCCESS; + 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; + + /* + * Save input_brigade in bb brigade. (At least) in the SSL case + * input_brigade contains transient buckets whose data would get + * overwritten during the next call of ap_get_brigade in the loop. + * ap_save_brigade ensures these buckets to be set aside. + * Calling ap_save_brigade with NULL as filter is OK, because + * bb brigade already has been created and does not need to get + * created by ap_save_brigade. + */ + status = ap_save_brigade(NULL, &bb, &input_brigade, p); + if (status != APR_SUCCESS) { + return status; + } + + 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 { + + /* + * Save input_brigade in body_brigade. (At least) in the SSL case + * input_brigade contains transient buckets whose data would get + * overwritten during the next call of ap_get_brigade in the loop. + * ap_save_brigade ensures these buckets to be set aside. + * Calling ap_save_brigade with NULL as filter is OK, because + * body_brigade already has been created and does not need to get + * created by ap_save_brigade. + */ + status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p); + if (status != APR_SUCCESS) { + return status; + } + + } + + 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) { + const char *server_name = ap_get_server_name(r); + /* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host, + * then the server name returned by ap_get_server_name() is the + * origin server name (which does make too much sense with Via: headers) + * so we use the proxy vhost's name instead. + */ + if (server_name == r->hostname) + server_name = r->server->server_hostname; + /* 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), + server_name, server_portstr, + AP_SERVER_BASEVERSION) + : apr_psprintf(p, "%d.%d %s%s", + HTTP_VERSION_MAJOR(r->proto_num), + HTTP_VERSION_MINOR(r->proto_num), + server_name, 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); + bytes_read += bytes; + + /* + * Save temp_brigade in input_brigade. (At least) in the SSL case + * temp_brigade contains transient buckets whose data would get + * overwritten during the next call of ap_get_brigade in the loop. + * ap_save_brigade ensures these buckets to be set aside. + * Calling ap_save_brigade with NULL as filter is OK, because + * input_brigade already has been created and does not need to get + * created by ap_save_brigade. + */ + status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p); + if (status != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server, + "proxy: processing prefetched 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; + } + + /* 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") + && !apr_table_get(r->subprocess_env, "proxy-sendchunked"))) { + 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-sendchunked")) + && !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 int addit_dammit(void *v, const char *key, const char *val) +{ + apr_table_addn(v, key, val); + return 1; +} + +/* + * Limit the number of interim respones we sent back to the client. Otherwise + * we suffer from a memory build up. Besides there is NO sense in sending back + * an unlimited number of interim responses to the client. Thus if we cross + * this limit send back a 502 (Bad Gateway). + */ +#ifndef AP_MAX_INTERIM_RESPONSES +#define AP_MAX_INTERIM_RESPONSES 10 +#endif + +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; + apr_table_t *save_table; + 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 && (received_continue <= AP_MAX_INTERIM_RESPONSES)) { + 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. */ + + /* First, tuck away all already existing cookies */ + save_table = apr_table_make(r->pool, 2); + apr_table_do(addit_dammit, save_table, r->headers_out, + "Set-Cookie", NULL); + + 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; + } + + /* Now, add in the just read cookies */ + apr_table_do(addit_dammit, save_table, r->headers_out, + "Set-Cookie", NULL); + + /* and now load 'em all in */ + if (!apr_is_empty_table(save_table)) { + apr_table_unset(r->headers_out, "Set-Cookie"); + r->headers_out = apr_table_overlay(r->pool, + r->headers_out, + save_table); + } + + /* 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)); + } + if (!ap_is_HTTP_INFO(r->status)) { + ap_proxy_pre_http_request(origin, rp); + } + + /* handle Via header in response */ + if (conf->viaopt != via_off && conf->viaopt != via_block) { + const char *server_name = ap_get_server_name(r); + /* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host, + * then the server name returned by ap_get_server_name() is the + * origin server name (which does make too much sense with Via: headers) + * so we use the proxy vhost's name instead. + */ + if (server_name == r->hostname) + server_name = r->server->server_hostname; + + /* 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), + server_name, + server_portstr, + AP_SERVER_BASEVERSION) + : apr_psprintf(p, "%d.%d %s%s", + HTTP_VERSION_MAJOR(r->proto_num), + HTTP_VERSION_MINOR(r->proto_num), + server_name, + 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 { + received_continue++; + 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"); + } + } + + /* See define of AP_MAX_INTERIM_RESPONSES for why */ + if (received_continue > AP_MAX_INTERIM_RESPONSES) { + return ap_proxyerror(r, HTTP_BAD_GATEWAY, + apr_psprintf(p, + "Too many (%d) interim responses from origin server", + received_continue)); + } + + 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 */ +}; + |