/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License.
*/
/* do syntatic check. * We break the URL into host, port, path, search
*/
err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port); if (err) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01083) "error parsing URL %s: %s", base_url, err); return HTTP_BAD_REQUEST;
}
/* * now parse path/search args, according to rfc1738: * process the path. * * In a reverse proxy, our URL has been processed, so canonicalise * unless proxy-nocanon is set to say it's raw * In a forward proxy, we have and MUST NOT MANGLE the original.
*/ switch (r->proxyreq) { default: /* wtf are we doing here? */ case PROXYREQ_REVERSE: if (apr_table_get(r->notes, "proxy-nocanon")) {
path = url; /* this is the raw path */
} elseif (apr_table_get(r->notes, "proxy-noencode")) {
path = url; /* this is the encoded path already */
search = r->args;
} else {
core_dir_config *d = ap_get_core_module_config(r->per_dir_config); int flags = d->allow_encoded_slashes && !d->decode_encoded_slashes ? PROXY_CANONENC_NOENCODEDSLASHENCODING : 0;
path = ap_proxy_canonenc_ex(r->pool, url, strlen(url), enc_path,
flags, r->proxyreq); if (!path) { return HTTP_BAD_REQUEST;
}
search = r->args;
} break; case PROXYREQ_PROXY:
path = url; break;
} /* * If we have a raw control character or a ' ' in nocanon path or * r->args, correct encoding was missed.
*/ if (path == url && *ap_scan_vchar_obstext(path)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10415) "To be forwarded path contains control " "characters or spaces"); return HTTP_FORBIDDEN;
} if (search && *ap_scan_vchar_obstext(search)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10408) "To be forwarded query string contains control " "characters or spaces"); return HTTP_FORBIDDEN;
}
staticint stream_reqbody(proxy_http_req_t *req)
{
request_rec *r = req->r; int seen_eos = 0, rv = OK;
apr_size_t hdr_len; char chunk_hdr[20]; /* must be here due to transient bucket. */
conn_rec *origin = req->origin;
proxy_conn_rec *p_conn = req->backend;
apr_bucket_alloc_t *bucket_alloc = req->bucket_alloc;
apr_bucket_brigade *header_brigade = req->header_brigade;
apr_bucket_brigade *input_brigade = req->input_brigade;
rb_methods rb_method = req->rb_method;
apr_off_t bytes, bytes_streamed = 0;
apr_bucket *e;
do { if (APR_BRIGADE_EMPTY(input_brigade)
&& APR_BRIGADE_EMPTY(header_brigade)) {
rv = ap_proxy_read_input(r, p_conn, input_brigade,
HUGE_STRING_LEN); if (rv != OK) { return rv;
}
}
if (!APR_BRIGADE_EMPTY(input_brigade)) { /* If this brigade contains EOS, remove it and be done. */ 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);
}
if (rb_method == RB_STREAM_CHUNKED) { if (bytes) { /* * Prepend the size of the chunk
*/
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(CRLF_ASCII, 2, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
} if (seen_eos) { /* * Append the tailing 0-size chunk
*/
e = apr_bucket_immortal_create(ZERO_ASCII CRLF_ASCII /* <trailers> */
CRLF_ASCII,
5, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
}
} elseif (rb_method == RB_STREAM_CL
&& (bytes_streamed > req->cl_val
|| (seen_eos && bytes_streamed < req->cl_val))) { /* C-L != bytes streamed?!? * * Prevent HTTP Request/Response Splitting. * * We can't stream more (or less) bytes at the back end since * they could be interpreted in separate requests (more bytes * now would start a new request, less bytes would make the * first bytes of the next request be part of the current one). * * It can't happen from the client connection here thanks to * ap_http_filter(), but some module's filter may be playing * bad games, hence the HTTP_INTERNAL_SERVER_ERROR.
*/
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01086) "read %s bytes of request body than expected " "(got %" APR_OFF_T_FMT ", expected " "%" APR_OFF_T_FMT ")",
bytes_streamed > req->cl_val ? "more" : "less",
bytes_streamed, req->cl_val); return HTTP_INTERNAL_SERVER_ERROR;
}
if (seen_eos && apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
e = apr_bucket_immortal_create(CRLF_ASCII, 2, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
}
}
/* If we never sent the header brigade, go ahead and take care of * that now by prepending it (once only since header_brigade will be * empty afterward).
*/
APR_BRIGADE_PREPEND(input_brigade, header_brigade);
/* Flush here on EOS because we won't ap_proxy_read_input() again. */
rv = ap_proxy_pass_brigade(bucket_alloc, r, p_conn, origin,
input_brigade, seen_eos); if (rv != OK) { return rv;
}
} while (!seen_eos);
/* * Handle Connection: header if we do HTTP/1.1 request: * If we plan to close the backend connection sent Connection: close * otherwise sent Connection: Keep-Alive.
*/ if (!req->force10) { if (req->upgrade) {
buf = apr_pstrdup(req->p, "Connection: Upgrade" CRLF);
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), req->p, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(req->header_brigade, e);
/* Tell the backend that it can upgrade the connection. */
buf = apr_pstrcat(req->p, "Upgrade: ", req->upgrade, CRLF, NULL);
} elseif (ap_proxy_connection_reusable(req->backend)) {
buf = apr_pstrdup(req->p, "Connection: Keep-Alive" CRLF);
} else {
buf = apr_pstrdup(req->p, "Connection: close" CRLF);
}
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), req->p, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(req->header_brigade, e);
}
/* add empty line at the end of the headers */
e = apr_bucket_immortal_create(CRLF_ASCII, 2, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(req->header_brigade, e);
}
/* 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 unpleasant. * * An exception: when a kept_body is present, then subrequest CAN use * pass request bodies, and we DONT skip the body.
*/ if (!r->kept_body && r->main) { /* XXX: Why DON'T sub-requests use keepalives? */
p_conn->close = 1;
req->old_te_val = NULL;
req->old_cl_val = NULL;
req->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 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 (req->old_te_val && ap_cstr_casecmp(req->old_te_val, "chunked") != 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01093) "%s Transfer-Encoding is not supported",
req->old_te_val); return HTTP_INTERNAL_SERVER_ERROR;
}
/* 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 desirable. * * 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_BRIGADE_EMPTY(input_brigade)
&& 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 (req->old_cl_val || req->old_te_val || bytes_read) {
req->old_cl_val = apr_off_t_toa(r->pool, bytes_read);
req->cl_val = bytes_read;
}
req->rb_method = RB_STREAM_CL;
} elseif (req->old_te_val) { if (req->force10
|| (apr_table_get(r->subprocess_env, "proxy-sendcl")
&& !apr_table_get(r->subprocess_env, "proxy-sendchunks")
&& !apr_table_get(r->subprocess_env, "proxy-sendchunked"))) {
req->rb_method = RB_SPOOL_CL;
} else {
req->rb_method = RB_STREAM_CHUNKED;
}
} elseif (req->old_cl_val) { if (r->input_filters == r->proto_input_filters) { if (!ap_parse_strict_length(&req->cl_val, req->old_cl_val)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01085) "could not parse request Content-Length (%s)",
req->old_cl_val); return HTTP_BAD_REQUEST;
}
req->rb_method = RB_STREAM_CL;
} elseif (!req->force10
&& (apr_table_get(r->subprocess_env, "proxy-sendchunks")
|| apr_table_get(r->subprocess_env, "proxy-sendchunked"))
&& !apr_table_get(r->subprocess_env, "proxy-sendcl")) {
req->rb_method = RB_STREAM_CHUNKED;
} else {
req->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.
*/
req->rb_method = RB_SPOOL_CL;
}
switch (req->rb_method) { case RB_STREAM_CHUNKED:
add_te_chunked(req->p, bucket_alloc, header_brigade); break;
case RB_STREAM_CL: if (req->old_cl_val) {
add_cl(req->p, bucket_alloc, header_brigade, req->old_cl_val);
} break;
default: /* => RB_SPOOL_CL */ /* If we have to spool the body, do it now, before connecting or * reusing the backend connection.
*/
rv = ap_proxy_spool_input(r, p_conn, input_brigade,
&bytes, MAX_MEM_SPOOL); if (rv != OK) { return rv;
} if (bytes || req->old_te_val || req->old_cl_val) {
add_cl(p, bucket_alloc, header_brigade, apr_off_t_toa(p, bytes));
}
}
/* Yes I hate gotos. This is the subrequest shortcut */
skip_body:
terminate_headers(req);
return OK;
}
staticint ap_proxy_http_request(proxy_http_req_t *req)
{ int rv;
request_rec *r = req->r;
/* send the request header/body, if any. */ switch (req->rb_method) { case RB_SPOOL_CL: case RB_STREAM_CL: case RB_STREAM_CHUNKED: if (req->do_100_continue) {
rv = ap_proxy_pass_brigade(req->bucket_alloc, r, req->backend,
req->origin, req->header_brigade, 1);
} else {
rv = stream_reqbody(req);
} break;
default: /* shouldn't be possible */
rv = HTTP_INTERNAL_SERVER_ERROR; break;
}
if (rv != OK) {
conn_rec *c = r->connection; /* apr_status_t value has been logged in lower level method */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01097) "pass request body failed to %pI (%s) from %s (%s)",
req->backend->addr,
req->backend->hostname ? req->backend->hostname: "",
c->client_ip, c->remote_host ? c->remote_host: ""); return rv;
}
return OK;
}
/* * If the date is a valid RFC 850 date or asctime() date, then it * is converted to the RFC 1123 format.
*/ staticconstchar *date_canon(apr_pool_t *p, constchar *date)
{
apr_status_t rv; char* ndate;
apr_time_t time = apr_date_parse_http(date); if (!time) { return date;
}
/* * 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 apr_status_t 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; int saw_headers = 0; void *sconf = r->server->module_config;
proxy_server_conf *psc;
proxy_dir_conf *dconf;
apr_status_t rc;
apr_bucket_brigade *tmp_bb;
/* * Read header lines until we get the empty separator line, a read error, * the connection closes (EOF), or we timeout.
*/
ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r, "Headers received from backend:");
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 APR_EINVAL;
} elseif (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_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01098) "Starting body due to bogus non-header " "in headers returned by %s (%s)",
r->uri, r->method);
*pread_len = len; return APR_SUCCESS;
} else {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01099) "No HTTP headers returned by %s (%s)",
r->uri, r->method); return APR_SUCCESS;
}
}
} /* this is the psc->badopt == bad_ignore case */
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01100) "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, dconf, buffer, value);
saw_headers = 1;
} return APR_SUCCESS;
}
/* * Limit the number of interim responses we sent back to the client. Otherwise * we suffer from a memory build up. Besides there is NO sense in sending back * an unlimited number of interim responses to the client. Thus if we cross * this limit send back a 502 (Bad Gateway).
*/ #ifndef AP_MAX_INTERIM_RESPONSES #define AP_MAX_INTERIM_RESPONSES 10 #endif
/* Only use dynamically sized buffer if user specifies ResponseFieldSize */ if(backend->worker->s->response_field_size_set) {
response_field_size = backend->worker->s->response_field_size;
/* Setup for 100-Continue timeout if appropriate */ if (do_100_continue && worker->s->ping_timeout_set) {
apr_socket_timeout_get(backend->sock, &old_timeout); if (worker->s->ping_timeout != old_timeout) {
apr_status_t rc;
rc = apr_socket_timeout_set(backend->sock, worker->s->ping_timeout); if (rc != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(01101) "could not set 100-Continue timeout");
}
}
}
/* Get response from the remote server, and pass it up the * filter chain
*/
backend->r = make_fake_req(origin, r); /* In case anyone needs to know, this is a fake request that is really a * response.
*/
backend->r->proxyreq = PROXYREQ_RESPONSE;
apr_table_setn(r->notes, "proxy-source-port", apr_psprintf(r->pool, "%hu",
origin->local_addr->port)); do {
apr_status_t rc; constchar *upgrade = NULL; int major = 0, minor = 0; int toclose = 0;
apr_brigade_cleanup(bb);
rc = ap_proxygetline(backend->tmp_bb, buffer, response_field_size,
backend->r, 0, &len); if (len == 0) { /* handle one potential stray CRLF */
rc = ap_proxygetline(backend->tmp_bb, buffer, response_field_size,
backend->r, 0, &len);
} if (len <= 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(01102) "error reading status line from remote " "server %s:%d", backend->hostname, backend->port); if (APR_STATUS_IS_TIMEUP(rc)) {
apr_table_setn(r->notes, "proxy_timedout", "1");
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01103) "read timeout"); if (do_100_continue) { return ap_proxyerror(r, HTTP_SERVICE_UNAVAILABLE, "Timeout on 100-Continue");
}
} /* * If we are a reverse proxy request shutdown the connection * WITHOUT ANY response to trigger a retry by the client * if allowed (as for idempotent requests). * BUT currently we should not do this if the request is the * first request on a keepalive connection as browsers like * seamonkey only display an empty page in this case and do * not do a retry. We should also not do this on a * connection which times out; instead handle as * we normally would handle timeouts
*/ if (r->proxyreq == PROXYREQ_REVERSE && c->keepalives &&
!APR_STATUS_IS_TIMEUP(rc)) {
apr_bucket *eos;
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01104) "Closing connection to client because" " reading from backend server %s:%d failed." " Number of keepalives %i", backend->hostname,
backend->port, c->keepalives);
ap_proxy_backend_broke(r, bb); /* * Add an EOC bucket to signal the ap_http_header_filter * that it should get out of our way, BUT ensure that the * EOC bucket is inserted BEFORE an EOS bucket in bb as * some resource filters like mod_deflate pass everything * up to the EOS down the chain immediately and sent the * remainder of the brigade later (or even never). But in * this case the ap_http_header_filter does not get out of * our way soon enough.
*/
e = ap_bucket_eoc_create(c->bucket_alloc);
eos = APR_BRIGADE_LAST(bb); while ((APR_BRIGADE_SENTINEL(bb) != eos)
&& !APR_BUCKET_IS_EOS(eos)) {
eos = APR_BUCKET_PREV(eos);
} if (eos == APR_BRIGADE_SENTINEL(bb)) {
APR_BRIGADE_INSERT_TAIL(bb, e);
} else {
APR_BUCKET_INSERT_BEFORE(eos, e);
}
ap_pass_brigade(r->output_filters, bb); /* Mark the backend connection for closing */
backend->close = 1; if (origin->keepalives) { /* We already had a request on this backend connection and * might just have run into a keepalive race. Hence we * think positive and assume that the backend is fine and * we do not need to signal an error on backend side.
*/ return OK;
} /* * This happened on our first request on this connection to the * backend. This indicates something fishy with the backend. * Return HTTP_INTERNAL_SERVER_ERROR to signal an unrecoverable * server error. We do not worry about r->status code and a * possible error response here as the ap_http_outerror_filter * will fix all of this for us.
*/ return HTTP_INTERNAL_SERVER_ERROR;
} if (!c->keepalives) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01105) "NOT Closing connection to client" " although reading from backend server %s:%d" " failed.",
backend->hostname, backend->port);
} 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/#.# ###*")) {
major = buffer[5] - '0';
minor = buffer[7] - '0';
/* If not an HTTP/1 message or * if the status line was > 8192 bytes
*/ if ((major != 1) || (len >= response_field_size - 1)) { return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_pstrcat(p, "Corrupt status line returned " "by remote server: ", buffer, NULL));
}
backasswards = 0;
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';
}
proxy_status_line = apr_pstrdup(p, &buffer[9]);
/* The status out of the front is the same as the status coming in * from the back, until further notice.
*/
r->status = proxy_status;
r->status_line = proxy_status_line;
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, "Status from backend: %d", proxy_status);
/* read the headers. */ /* N.B. for HTTP/1.0 clients, we have to fold line-wrapped headers*/ /* Also, take care with headers with multiple occurrences. */
/* 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 */
rc = ap_proxy_read_headers(r, backend->r, buffer, response_field_size,
origin, &pread_len);
if (rc != APR_SUCCESS || r->headers_out == NULL) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01106) "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);
}
/* * Save a possible Transfer-Encoding header as we need it later for * ap_http_filter to know where to end.
*/
te = apr_table_get(r->headers_out, "Transfer-Encoding");
/* can't have both Content-Length and Transfer-Encoding */ if (te && 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_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01107) "server %s:%d returned Transfer-Encoding" " and Content-Length",
backend->hostname, backend->port);
backend->close = 1;
}
/* Delete warnings with wrong date */
r->headers_out = ap_proxy_clean_warnings(p, r->headers_out);
/* handle Via header in response */ if (req->sconf->viaopt != via_off
&& req->sconf->viaopt != via_block) { constchar *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_addn(r->headers_out, "Via",
(req->sconf->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,
req->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,
req->server_portstr)
);
}
/* cancel keepalive if HTTP/1.0 or less */ if ((major < 1) || (minor < 1)) {
backend->close = 1;
origin->keepalive = AP_CONN_CLOSE;
} else { /* * Keep track of the number of keepalives we processed on this * connection.
*/
origin->keepalives++;
}
if (ap_is_HTTP_INFO(proxy_status)) { constchar *policy = NULL;
/* RFC2616 tells us to forward this. * * OTOH, an interim response here may mean the backend * is playing sillybuggers. The Client didn't ask for * it within the defined HTTP/1.1 mechanisms, and if * it's an extension, it may also be unsupported by us. * * There's also the possibility that changing existing * behaviour here might break something. * * So let's make it configurable. * * We need to force "r->expecting_100 = 1" for RFC behaviour * otherwise ap_send_interim_response() does nothing when * the client did not ask for 100-continue. * * 101 Switching Protocol has its own configuration which * shouldn't be interfered by "proxy-interim-response".
*/ if (proxy_status != HTTP_SWITCHING_PROTOCOLS) {
policy = apr_table_get(r->subprocess_env, "proxy-interim-response");
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "HTTP: received interim %d response (policy: %s)",
r->status, policy ? policy : "n/a"); if (!policy
|| (!strcasecmp(policy, "RFC")
&& (proxy_status != HTTP_CONTINUE
|| (r->expecting_100 = 1)))) { switch (proxy_status) { case HTTP_SWITCHING_PROTOCOLS:
AP_DEBUG_ASSERT(upgrade != NULL);
apr_table_setn(r->headers_out, "Connection", "Upgrade");
apr_table_setn(r->headers_out, "Upgrade",
apr_pstrdup(p, upgrade)); break;
}
ap_send_interim_response(r, 1);
} /* FIXME: refine this to be able to specify per-response-status * policies and maybe also add option to bail out with 502
*/ elseif (strcasecmp(policy, "Suppress")) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01108) "undefined proxy interim response policy");
}
interim_response++;
} else {
interim_response = 0;
}
/* If we still do 100-continue (end-to-end or ping), either the * current response is the expected "100 Continue" and we are done * with this mode, or this is another interim response and we'll wait * for the next one, or this is a final response and hence the backend * did not honor our expectation.
*/ if (do_100_continue && (!interim_response
|| proxy_status == HTTP_CONTINUE)) { /* RFC 7231 - Section 5.1.1 - Expect - Requirement for servers * A server that responds with a final status code before * reading the entire message body SHOULD indicate in that * response whether it intends to close the connection or * continue reading and discarding the request message. * * So, if this response is not an interim 100 Continue, we can * avoid sending the request body if the backend responded with * "Connection: close" or HTTP < 1.1, and either let the core * discard it or the caller try another balancer member with the * same body (given status 503, though not implemented yet).
*/ int do_send_body = (proxy_status == HTTP_CONTINUE
|| (!toclose && major > 0 && minor > 0));
/* Reset to old timeout iff we've adjusted it. */ if (worker->s->ping_timeout_set) {
apr_socket_timeout_set(backend->sock, old_timeout);
}
if (do_send_body) {
status = send_continue_body(req); if (status != OK) { return status;
}
} else { /* If we don't read the client connection any further, since * there are pending data it should be "Connection: close"d to * prevent reuse. We don't exactly c->keepalive = AP_CONN_CLOSE * here though, because error_override or a potential retry on * another backend could finally read that data and finalize * the request processing, making keep-alive possible. So what * we do is leaving r->expecting_100 alone, ap_set_keepalive() * will do the right thing according to the final response and * any later update of r->expecting_100.
*/
}
/* If we didn't send the full body yet, do it now */ if (do_100_continue) {
r->expecting_100 = 0;
status = send_continue_body(req); if (status != OK) { return status;
}
}
/* Set timeout to the highest configured for client or backend */
apr_socket_timeout_get(backend->sock, &backend_timeout);
apr_socket_timeout_get(ap_get_conn_socket(c), &client_timeout); if (backend_timeout >= 0 && backend_timeout > client_timeout) {
tunnel->timeout = backend_timeout;
} else {
tunnel->timeout = client_timeout;
}
/* Let proxy tunnel forward everything */
status = ap_proxy_tunnel_run(tunnel);
/* We are done with both connections */ return DONE;
}
if (interim_response) { /* Already forwarded above, read next response */ continue;
}
/* Moved the fixups of Date headers and those affected by * ProxyPassReverse/etc from here to ap_proxy_read_headers
*/
/* PR 41646: get HEAD right with ProxyErrorOverride */ if (ap_proxy_should_override(dconf, proxy_status)) { if (proxy_status == HTTP_UNAUTHORIZED) { constchar *buf; constchar *wa = "WWW-Authenticate"; if ((buf = apr_table_get(r->headers_out, wa))) {
apr_table_set(r->err_headers_out, wa, buf);
} else {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01109) "origin server sent 401 without " "WWW-Authenticate header");
}
}
/* clear r->status for override error, otherwise ErrorDocument * thinks that this is a recursive error, and doesn't find the * custom error page
*/
r->status = HTTP_OK; /* Discard body, if one is expected */ if (!r->header_only && !AP_STATUS_IS_HEADER_ONLY(proxy_status)) { constchar *tmp; /* Add minimal headers needed to allow http_in filter
* detecting end of body without waiting for a timeout. */ if ((tmp = apr_table_get(r->headers_out, "Transfer-Encoding"))) {
apr_table_set(backend->r->headers_in, "Transfer-Encoding", tmp);
} elseif ((tmp = apr_table_get(r->headers_out, "Content-Length"))) {
apr_table_set(backend->r->headers_in, "Content-Length", tmp);
} elseif (te) {
apr_table_set(backend->r->headers_in, "Transfer-Encoding", te);
}
ap_discard_request_body(backend->r);
} /* * prevent proxy_handler() from treating this as an * internal error.
*/
apr_table_setn(r->notes, "proxy-error-override", "1"); return proxy_status;
}
/* Forward back Upgrade header if it matches the configured one(s), it * may be an HTTP_UPGRADE_REQUIRED response or some other status where * Upgrade makes sense to negotiate the protocol by other means.
*/ if (upgrade && ap_proxy_worker_can_upgrade(p, worker, upgrade,
(*req->proto == 'w')
? "WebSocket" : NULL)) {
apr_table_setn(r->headers_out, "Connection", "Upgrade");
apr_table_setn(r->headers_out, "Upgrade", apr_pstrdup(p, upgrade));
}
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 */
(proxy_status != HTTP_NO_CONTENT) && /* not 204 */
(proxy_status != HTTP_NOT_MODIFIED)) { /* not 304 */
apr_read_type_e mode; int finish;
/* 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.
*/
backend->r->headers_in = apr_table_clone(backend->r->pool, r->headers_out); /* * Restore Transfer-Encoding header from response if we saved * one before and there is none left. We need it for the * ap_http_filter. See above.
*/ if (te && !apr_table_get(backend->r->headers_in, "Transfer-Encoding")) {
apr_table_add(backend->r->headers_in, "Transfer-Encoding", te);
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, "start body send");
/* read the body, pass it to the output filters */
/* Handle the case where the error document is itself reverse * proxied and was successful. We must maintain any previous * error status so that an underlying error (eg HTTP_NOT_FOUND) * doesn't become an HTTP_OK.
*/ if (ap_proxy_should_override(dconf, original_status)) {
r->status = original_status;
r->status_line = original_status_line;
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung ist noch experimentell.
