--- /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;
+
+static apr_status_t ap_proxy_http_cleanup(const char *scheme,
+ request_rec *r,
+ 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.
+ */
+static int 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, 0, 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;
+}
+
+/* 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 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_conn_rec *conn,
+ conn_rec *origin, apr_bucket_brigade *bb,
+ int flush)
+{
+ apr_status_t status;
+ apr_off_t transferred;
+
+ if (flush) {
+ apr_bucket *e = apr_bucket_flush_create(bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(bb, e);
+ }
+ apr_brigade_length(bb, 0, &transferred);
+ if (transferred != -1)
+ conn->worker->s->transferred += transferred;
+ 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)",
+ conn->addr, conn->hostname);
+ return status;
+ }
+ apr_brigade_cleanup(bb);
+ return APR_SUCCESS;
+}
+
+#define MAX_MEM_SPOOL 16384
+
+static apr_status_t stream_reqbody_chunked(apr_pool_t *p,
+ request_rec *r,
+ proxy_conn_rec *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;
+ }
+
+ 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);
+ }
+ e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF
+ /* <trailers> */
+ ASCII_CRLF,
+ 5, bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(input_brigade, e);
+ bb = input_brigade;
+ }
+
+ 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_conn_rec *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;
+
+ /* As a shortcut, if this brigade is simply an EOS bucket,
+ * don't send anything down the filter chain.
+ */
+ if (APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade))) {
+ break;
+ }
+
+ /* 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;
+ }
+
+ 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 (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
+ */
+ terminate_headers(bucket_alloc, header_brigade);
+ bb = header_brigade;
+ }
+ else {
+ /* need to flush any pending data */
+ bb = input_brigade; /* empty now; pass_brigade() will add flush */
+ }
+ status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
+ return status;
+}
+
+static apr_status_t spool_reqbody_cl(apr_pool_t *p,
+ request_rec *r,
+ proxy_conn_rec *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);
+ }
+ 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_conn_rec *p_conn, conn_rec *origin,
+ proxy_server_conf *conf,
+ apr_uri_t *uri,
+ char *url, char *server_portstr)
+{
+ conn_rec *c = r->connection;
+ apr_bucket_alloc_t *bucket_alloc = c->bucket_alloc;
+ apr_bucket_brigade *header_brigade;
+ 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;
+
+ header_brigade = apr_brigade_create(p, origin->bucket_alloc);
+
+ /*
+ * 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",
+ c->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) {
+ /* XXX: Why DON'T sub-requests use keepalives? */
+ 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 "
+ "chunked 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 + 1024 - bytes_read);
+ if (status != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
+ "proxy: prefetch request body failed to %pI (%s)"
+ " from %s (%s)",
+ p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
+ 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;
+ }
+ 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->hostname ? p_conn->hostname: "",
+ c->remote_ip,
+ c->remote_host ? c->remote_host: "");
+ return status;
+ }
+ return APR_SUCCESS;
+}
+
+static void process_proxy_header(request_rec* r, proxy_server_conf* c,
+ const char* key, const char* value)
+{
+ static const char* date_hdrs[]
+ = { "Date", "Expires", "Last-Modified", NULL } ;
+ static const struct {
+ const char* name;
+ ap_proxy_header_reverse_map_fn func;
+ } transform_hdrs[] = {
+ { "Location", ap_proxy_location_reverse_map } ,
+ { "Content-Location", ap_proxy_location_reverse_map } ,
+ { "URI", ap_proxy_location_reverse_map } ,
+ { "Destination", ap_proxy_location_reverse_map } ,
+ { "Set-Cookie", ap_proxy_cookie_reverse_map } ,
+ { NULL, NULL }
+ } ;
+ int i ;
+ for ( i = 0 ; date_hdrs[i] ; ++i ) {
+ if ( !strcasecmp(date_hdrs[i], key) ) {
+ apr_table_add(r->headers_out, key,
+ ap_proxy_date_canon(r->pool, value)) ;
+ return ;
+ }
+ }
+ for ( i = 0 ; transform_hdrs[i].name ; ++i ) {
+ if ( !strcasecmp(transform_hdrs[i].name, key) ) {
+ apr_table_add(r->headers_out, key,
+ (*transform_hdrs[i].func)(r, c, value)) ;
+ return ;
+ }
+ }
+ apr_table_add(r->headers_out, key, value) ;
+ return ;
+}
+
+/*
+ * Note: pread_len is the length of the response that we've mistakenly
+ * read (assuming that we don't consider that an error via
+ * ProxyBadHeader StartBody). This depends on buffer actually being
+ * local storage to the calling code in order for pread_len to make
+ * any sense at all, since we depend on buffer still containing
+ * what was read by ap_getline() upon return.
+ */
+static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
+ char *buffer, int size,
+ conn_rec *c, int *pread_len)
+{
+ int len;
+ char *value, *end;
+ char field[MAX_STRING_LEN];
+ int saw_headers = 0;
+ void *sconf = r->server->module_config;
+ proxy_server_conf *psc;
+
+ psc = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
+
+ r->headers_out = apr_table_make(r->pool, 20);
+ *pread_len = 0;
+
+ /*
+ * Read header lines until we get the empty separator line, a read error,
+ * the connection closes (EOF), or we timeout.
+ */
+ while ((len = ap_getline(buffer, size, rr, 1)) > 0) {
+
+ if (!(value = strchr(buffer, ':'))) { /* Find the colon separator */
+
+ /* We may encounter invalid headers, usually from buggy
+ * MS IIS servers, so we need to determine just how to handle
+ * them. We can either ignore them, assume that they mark the
+ * start-of-body (eg: a missing CRLF) or (the default) mark
+ * the headers as totally bogus and return a 500. The sole
+ * exception is an extra "HTTP/1.0 200, OK" line sprinkled
+ * in between the usual MIME headers, which is a favorite
+ * IIS bug.
+ */
+ /* XXX: The mask check is buggy if we ever see an HTTP/1.10 */
+
+ if (!apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
+ if (psc->badopt == bad_error) {
+ /* Nope, it wasn't even an extra HTTP header. Give up. */
+ r->headers_out = NULL;
+ return ;
+ }
+ else if (psc->badopt == bad_body) {
+ /* if we've already started loading headers_out, then
+ * return what we've accumulated so far, in the hopes
+ * that they are useful; also note that we likely pre-read
+ * the first line of the response.
+ */
+ if (saw_headers) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
+ "proxy: Starting body due to bogus non-header in headers "
+ "returned by %s (%s)", r->uri, r->method);
+ *pread_len = len;
+ return ;
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
+ "proxy: No HTTP headers "
+ "returned by %s (%s)", r->uri, r->method);
+ return ;
+ }
+ }
+ }
+ /* this is the psc->badopt == bad_ignore case */
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
+ "proxy: Ignoring bogus HTTP header "
+ "returned by %s (%s)", r->uri, r->method);
+ continue;
+ }
+
+ *value = '\0';
+ ++value;
+ /* XXX: RFC2068 defines only SP and HT as whitespace, this test is
+ * wrong... and so are many others probably.
+ */
+ while (apr_isspace(*value))
+ ++value; /* Skip to start of value */
+
+ /* should strip trailing whitespace as well */
+ for (end = &value[strlen(value)-1]; end > value && apr_isspace(*end); --
+end)
+ *end = '\0';
+
+ /* make sure we add so as not to destroy duplicated headers
+ * Modify headers requiring canonicalisation and/or affected
+ * by ProxyPassReverse and family with process_proxy_header
+ */
+ process_proxy_header(r, psc, buffer, value) ;
+ saw_headers = 1;
+
+ /* the header was too long; at the least we should skip extra data */
+ if (len >= size - 1) {
+ while ((len = ap_getline(field, MAX_STRING_LEN, rr, 1))
+ >= MAX_STRING_LEN - 1) {
+ /* soak up the extra data */
+ }
+ if (len == 0) /* time to exit the larger loop as well */
+ break;
+ }
+ }
+}
+
+
+
+static int addit_dammit(void *v, const char *key, const char *val)
+{
+ apr_table_addn(v, key, val);
+ return 1;
+}
+
+static
+apr_status_t ap_proxy_http_process_response(apr_pool_t * p, request_rec *r,
+ proxy_conn_rec *backend,
+ conn_rec *origin,
+ proxy_server_conf *conf,
+ 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_bucket_brigade *bb;
+ int len, backasswards;
+ int interim_response; /* non-zero whilst interim 1xx responses
+ * are being read. */
+ int pread_len = 0;
+ apr_table_t *save_table;
+
+ bb = apr_brigade_create(p, c->bucket_alloc);
+
+ /* 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;
+ do {
+ 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) {
+ ap_proxy_http_cleanup(NULL, r, backend);
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "proxy: error reading status line from remote "
+ "server %s", backend->hostname);
+ return ap_proxyerror(r, HTTP_BAD_GATEWAY,
+ "Error reading from remote server");
+ }
+ /* XXX: Is this a real headers length send from remote? */
+ backend->worker->s->read += len;
+
+ /* 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)) {
+ ap_proxy_http_cleanup(NULL, r, backend);
+ 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);
+
+ /* shove the headers direct into r->headers_out */
+ ap_proxy_read_headers(r, rp, buffer, sizeof(buffer), origin,
+ &pread_len);
+
+ 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);
+ backend->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";
+ *
+ * To help mitigate HTTP Splitting, unset Content-Length
+ * and shut down the backend server connection
+ * XXX: We aught to treat such a response as uncachable
+ */
+ 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", backend->hostname);
+ backend->close += 1;
+ }
+
+ /* strip connection listed hop-by-hop headers from response */
+ backend->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) {
+ 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)) {
+ backend->close += 1;
+ origin->keepalive = AP_CONN_CLOSE;
+ }
+ } else {
+ /* an http/0.9 response */
+ backasswards = 1;
+ r->status = 200;
+ r->status_line = "200 OK";
+ backend->close += 1;
+ }
+
+ interim_response = ap_is_HTTP_INFO(r->status);
+ if (interim_response) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
+ "proxy: HTTP: received interim %d response",
+ r->status);
+ }
+ /* Moved the fixups of Date headers and those affected by
+ * ProxyPassReverse/etc from here to ap_proxy_read_headers
+ */
+
+ if ((r->status == 401) && (conf->error_override != 0)) {
+ const char *buf;
+ const char *wa = "WWW-Authenticate";
+ if ((buf = apr_table_get(r->headers_out, wa))) {
+ apr_table_set(r->err_headers_out, wa, buf);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
+ "proxy: origin server sent 401 without WWW-Authenticate header");
+ }
+ }
+
+ r->sent_bodyct = 1;
+ /*
+ * Is it an HTTP/0.9 response or did we maybe preread the 1st line of
+ * the response? If so, load the extra data. These are 2 mutually
+ * exclusive possibilities, that just happen to require very
+ * similar behavior.
+ */
+ if (backasswards || pread_len) {
+ apr_ssize_t cntr = (apr_ssize_t)pread_len;
+ if (backasswards) {
+ /*@@@FIXME:
+ * At this point in response processing of a 0.9 response,
+ * we don't know yet whether data is binary or not.
+ * mod_charset_lite will get control later on, so it cannot
+ * decide on the conversion of this buffer full of data.
+ * However, chances are that we are not really talking to an
+ * HTTP/0.9 server, but to some different protocol, therefore
+ * the best guess IMHO is to always treat the buffer as "text/x":
+ */
+ ap_xlate_proto_to_ascii(buffer, len);
+ cntr = (apr_ssize_t)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 */
+ !interim_response && /* not any 1xx response */
+ (r->status != HTTP_NO_CONTENT) && /* not 204 */
+ (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 || ap_is_HTTP_SUCCESS(r->status)) {
+ /* read the body, pass it to the output filters */
+ apr_read_type_e mode = APR_NONBLOCK_READ;
+ int finish = FALSE;
+
+ do {
+ apr_off_t readbytes;
+ apr_status_t rv;
+
+ rv = ap_get_brigade(rp->input_filters, bb,
+ AP_MODE_READBYTES, mode,
+ conf->io_buffer_size);
+
+ /* ap_get_brigade will return success with an empty brigade
+ * for a non-blocking read which would block: */
+ if (APR_STATUS_IS_EAGAIN(rv)
+ || (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb))) {
+ /* flush to the client and switch to blocking mode */
+ e = apr_bucket_flush_create(c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(bb, e);
+ if (ap_pass_brigade(r->output_filters, bb)
+ || c->aborted) {
+ backend->close = 1;
+ break;
+ }
+ apr_brigade_cleanup(bb);
+ mode = APR_BLOCK_READ;
+ continue;
+ }
+ else if (rv == APR_EOF) {
+ break;
+ }
+ else if (rv != APR_SUCCESS) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c,
+ "proxy: error reading response");
+ break;
+ }
+ /* next time try a non-blocking read */
+ mode = APR_NONBLOCK_READ;
+
+ apr_brigade_length(bb, 0, &readbytes);
+ backend->worker->s->read += readbytes;
+#if DEBUGGING
+ {
+ 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
+ */
+ backend->close = 1;
+ /* 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! */
+ backend->close = 1; /* this causes socket close below */
+ finish = TRUE;
+ }
+
+ /* make sure we always clean up after ourselves */
+ apr_brigade_cleanup(bb);
+
+ } while (!finish);
+ }
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
+ "proxy: end body send");
+ }
+ else if (!interim_response) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
+ "proxy: header only");
+
+ /* Pass EOS bucket down the filter chain. */
+ e = apr_bucket_eos_create(c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(bb, e);
+ if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS
+ || c->aborted) {
+ /* Ack! Phbtt! Die! User aborted! */
+ backend->close = 1; /* this causes socket close below */
+ }
+
+ apr_brigade_cleanup(bb);
+ }
+ } while (interim_response);
+
+ if (conf->error_override) {
+ /* the code above this checks for 'OK' which is what the hook expects */
+ if (ap_is_HTTP_SUCCESS(r->status))
+ 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 != HTTP_NO_CONTENT) && /* not 204 */
+ (status != HTTP_NOT_MODIFIED)) { /* not 304 */
+ ap_discard_request_body(rp);
+ }
+ return status;
+ }
+ } else
+ return OK;
+}
+
+static
+apr_status_t ap_proxy_http_cleanup(const char *scheme, request_rec *r,
+ 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 (backend->close || (r->proto_num < HTTP_VERSION(1,1))) {
+ backend->close_on_recycle = 1;
+ ap_set_module_config(r->connection->conn_config, &proxy_http_module, NULL);
+ ap_proxy_release_connection(scheme, backend, r->server);
+ }
+ 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.)
+ */
+static int proxy_http_handler(request_rec *r, proxy_worker *worker,
+ proxy_server_conf *conf,
+ char *url, const char *proxyname,
+ apr_port_t proxyport)
+{
+ int status;
+ char server_portstr[32];
+ char *scheme;
+ const char *proxy_function;
+ const char *u;
+ 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_uri_t *uri = apr_palloc(r->connection->pool, sizeof(*uri));
+
+ /* find the scheme */
+ u = strchr(url, ':');
+ if (u == NULL || u[1] != '/' || u[2] != '/' || u[3] == '\0')
+ return DECLINED;
+ if ((u - url) > 14)
+ return HTTP_BAD_REQUEST;
+ scheme = apr_pstrndup(c->pool, url, u - url);
+ /* scheme is lowercase */
+ ap_str_tolower(scheme);
+ /* is it for us? */
+ if (strcmp(scheme, "https") == 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;
+ proxy_function = "HTTPS";
+ }
+ else if (!(strcmp(scheme, "http") == 0 || (strcmp(scheme, "ftp") == 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 */
+ }
+ else {
+ if (*scheme == 'h')
+ proxy_function = "HTTP";
+ else
+ proxy_function = "FTP";
+ }
+ 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) {
+ if ((status = ap_proxy_acquire_connection(proxy_function, &backend,
+ worker, r->server)) != OK)
+ goto cleanup;
+
+ if (!r->main) {
+ ap_set_module_config(c->conn_config, &proxy_http_module, backend);
+ }
+ }
+
+ backend->is_ssl = is_ssl;
+ backend->close_on_recycle = 1;
+
+ /* Step One: Determine Who To Connect To */
+ if ((status = ap_proxy_determine_connection(p, r, conf, worker, backend,
+ uri, &url, proxyname,
+ proxyport, server_portstr,
+ sizeof(server_portstr))) != OK)
+ goto cleanup;
+
+ /* Step Two: Make the Connection */
+ if (ap_proxy_connect_backend(proxy_function, backend, worker, r->server)) {
+ if (r->proxyreq == PROXYREQ_PROXY)
+ status = HTTP_NOT_FOUND;
+ else
+ status = HTTP_SERVICE_UNAVAILABLE;
+ goto cleanup;
+ }
+
+ /* Step Three: Create conn_rec */
+ if (!backend->connection) {
+ if ((status = ap_proxy_connection_create(proxy_function, backend,
+ c, r->server)) != OK)
+ goto cleanup;
+ }
+
+ /* Step Four: Send the Request */
+ if ((status = ap_proxy_http_request(p, r, backend, backend->connection,
+ conf, uri, url, server_portstr)) != OK)
+ goto cleanup;
+
+ /* Step Five: Receive the Response */
+ if ((status = ap_proxy_http_process_response(p, r, backend,
+ backend->connection,
+ conf, server_portstr)) != OK)
+ goto cleanup;
+
+ /* Step Six: Clean Up */
+
+cleanup:
+ if (backend) {
+ if (status != OK) {
+ backend->close = 1;
+ backend->close_on_recycle = 1;
+ }
+ ap_proxy_http_cleanup(proxy_function, r, backend);
+ }
+ return status;
+}
+
+static void ap_proxy_http_register_hook(apr_pool_t *p)
+{
+ proxy_hook_scheme_handler(proxy_http_handler, NULL, NULL, APR_HOOK_FIRST);
+ proxy_hook_canon_handler(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
