--- /dev/null
+/* 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 */
+};
+
projects / thirdparty / apache / httpd.git / commitdiff
