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apache/modules/proxy/proxy_http.c
Joe Orton a636051074 * modules/proxy/proxy_http.c (ap_proxy_http_process_response): 
Consistently check whether r->status is "successful" or not; fix
screwy handling of 2xx-but-not-200 responses when ProxyErrorOverride
is used.

PR: 20183
Submitted by: Marcus Janson <marcus.janson@tre.se>, Joe Orton


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102935 13f79535-47bb-0310-9956-ffa450edef68
2004-03-11 17:21:47 +00:00

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/* Copyright 1999-2004 The Apache Software Foundation
*
* 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)
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';
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, &current_timeout);
/* set no timeout */
apr_socket_timeout_set(p_conn->sock, 0);
socket_status = apr_socket_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_ERR, 0, NULL,
"proxy: HTTP: previous connection is closed");
new = 1;
}
}
if (new) {
/* 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 */
ap_run_pre_connection(*origin, p_conn->sock);
}
return OK;
}
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, char *server_portstr)
{
conn_rec *c = r->connection;
char *buf;
apr_bucket *e, *last_header_bucket = NULL;
const apr_array_header_t *headers_in_array;
const apr_table_entry_t *headers_in;
int counter, seen_eos, send_chunks;
apr_status_t status;
apr_bucket_brigade *header_brigade, *body_brigade, *input_brigade;
header_brigade = apr_brigade_create(p, origin->bucket_alloc);
body_brigade = apr_brigade_create(p, origin->bucket_alloc);
input_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.
*/
p_conn->close += ap_proxy_liststr(apr_table_get(r->headers_in,
"Connection"), "close");
/* sub-requests never use keepalives */
if (r->main) {
p_conn->close++;
}
ap_proxy_clear_connection(p, r->headers_in);
if (p_conn->close) {
apr_table_setn(r->headers_in, "Connection", "close");
origin->keepalive = AP_CONN_CLOSE;
}
/* By default, we can not send chunks. That means we must buffer
* the entire request before sending it along to ensure we have
* the correct Content-Length attached.
*/
send_chunks = 0;
if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
} else {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
if (apr_table_get(r->subprocess_env, "proxy-sendchunks")) {
send_chunks = 1;
}
}
if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
apr_table_unset(r->headers_in, "Connection");
origin->keepalive = AP_CONN_CLOSE;
}
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
if (conf->preserve_host == 0) {
if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
buf = apr_pstrcat(p, "Host: ", uri->hostname, ":", uri->port_str,
CRLF, NULL);
} else {
buf = apr_pstrcat(p, "Host: ", uri->hostname, CRLF, NULL);
}
}
else {
/* don't want to use r->hostname, as the incoming header might have a
* port attached
*/
const char* hostname = apr_table_get(r->headers_in,"Host");
if (!hostname) {
hostname = r->server->server_hostname;
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
"proxy: no HTTP 0.9 request (with no host line) "
"on incoming request and preserve host set "
"forcing hostname to be %s for uri %s",
hostname,
r->uri );
}
buf = apr_pstrcat(p, "Host: ", hostname, CRLF, NULL);
}
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
/* handle Via */
if (conf->viaopt == via_block) {
/* Block all outgoing Via: headers */
apr_table_unset(r->headers_in, "Via");
} else if (conf->viaopt != via_off) {
const char *server_name = ap_get_server_name(r);
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
* then the server name returned by ap_get_server_name() is the
* origin server name (which does make too much sense with Via: headers)
* so we use the proxy vhost's name instead.
*/
if (server_name == r->hostname)
server_name = r->server->server_hostname;
/* Create a "Via:" request header entry and merge it */
/* Generate outgoing Via: header with/without server comment: */
apr_table_mergen(r->headers_in, "Via",
(conf->viaopt == via_full)
? apr_psprintf(p, "%d.%d %s%s (%s)",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name, server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name, server_portstr)
);
}
/* X-Forwarded-*: handling
*
* XXX Privacy Note:
* -----------------
*
* These request headers are only really useful when the mod_proxy
* is used in a reverse proxy configuration, so that useful info
* about the client can be passed through the reverse proxy and on
* to the backend server, which may require the information to
* function properly.
*
* In a forward proxy situation, these options are a potential
* privacy violation, as information about clients behind the proxy
* are revealed to arbitrary servers out there on the internet.
*
* The HTTP/1.1 Via: header is designed for passing client
* information through proxies to a server, and should be used in
* a forward proxy configuation instead of X-Forwarded-*. See the
* ProxyVia option for details.
*/
if (PROXYREQ_REVERSE == r->proxyreq) {
const char *buf;
/* Add X-Forwarded-For: so that the upstream has a chance to
* determine, where the original request came from.
*/
apr_table_mergen(r->headers_in, "X-Forwarded-For",
r->connection->remote_ip);
/* Add X-Forwarded-Host: so that upstream knows what the
* original request hostname was.
*/
if ((buf = apr_table_get(r->headers_in, "Host"))) {
apr_table_mergen(r->headers_in, "X-Forwarded-Host", buf);
}
/* Add X-Forwarded-Server: so that upstream knows what the
* name of this proxy server is (if there are more than one)
* XXX: This duplicates Via: - do we strictly need it?
*/
apr_table_mergen(r->headers_in, "X-Forwarded-Server",
r->server->server_hostname);
}
/* send request headers */
proxy_run_fixups(r);
headers_in_array = apr_table_elts(r->headers_in);
headers_in = (const apr_table_entry_t *) headers_in_array->elts;
for (counter = 0; counter < headers_in_array->nelts; counter++) {
if (headers_in[counter].key == NULL || headers_in[counter].val == NULL
/* Clear out hop-by-hop request headers not to send
* RFC2616 13.5.1 says we should strip these headers
*/
/* Already sent */
|| !apr_strnatcasecmp(headers_in[counter].key, "Host")
|| !apr_strnatcasecmp(headers_in[counter].key, "Keep-Alive")
|| !apr_strnatcasecmp(headers_in[counter].key, "TE")
|| !apr_strnatcasecmp(headers_in[counter].key, "Trailer")
|| !apr_strnatcasecmp(headers_in[counter].key, "Transfer-Encoding")
|| !apr_strnatcasecmp(headers_in[counter].key, "Upgrade")
/* We have no way of knowing whether this Content-Length will
* be accurate, so we must not include it.
*/
|| !apr_strnatcasecmp(headers_in[counter].key, "Content-Length")
/* 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.
*/
|| !apr_strnatcasecmp(headers_in[counter].key,"Proxy-Authorization")
|| !apr_strnatcasecmp(headers_in[counter].key,"Proxy-Authenticate")) {
continue;
}
/* for sub-requests, ignore freshness/expiry headers */
if (r->main) {
if (headers_in[counter].key == NULL || headers_in[counter].val == NULL
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Match")
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Modified-Since")
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Range")
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Unmodified-Since")
|| !apr_strnatcasecmp(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);
}
/* If we can send chunks, do so! */
if (send_chunks) {
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, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
}
else {
last_header_bucket = APR_BRIGADE_LAST(header_brigade);
}
/* add empty line at the end of the headers */
#if APR_CHARSET_EBCDIC
e = apr_bucket_immortal_create("\015\012", 2, c->bucket_alloc);
#else
e = apr_bucket_immortal_create(CRLF, sizeof(CRLF)-1, c->bucket_alloc);
#endif
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
e = apr_bucket_flush_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
if (send_chunks) {
status = ap_pass_brigade(origin->output_filters, header_brigade);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: request failed to %pI (%s)",
p_conn->addr, p_conn->name);
return status;
}
}
/* send the request data, if any. */
seen_eos = 0;
do {
char chunk_hdr[20]; /* must be here due to transient bucket. */
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 this brigade contain 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);
}
if (send_chunks) {
#define ASCII_CRLF "\015\012"
#define ASCII_ZERO "\060"
apr_size_t hdr_len;
apr_off_t bytes;
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,
body_brigade->bucket_alloc);
APR_BRIGADE_INSERT_HEAD(input_brigade, e);
/*
* Append the end-of-chunk CRLF
*/
e = apr_bucket_immortal_create(ASCII_CRLF, 2, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
}
e = apr_bucket_flush_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
APR_BRIGADE_CONCAT(body_brigade, input_brigade);
if (send_chunks) {
status = ap_pass_brigade(origin->output_filters, body_brigade);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: pass request data failed to %pI (%s)",
p_conn->addr, p_conn->name);
return status;
}
apr_brigade_cleanup(body_brigade);
}
} while (!seen_eos);
if (send_chunks) {
e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF
/* <trailers> */
ASCII_CRLF, 5, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(body_brigade, e);
}
if (!send_chunks) {
apr_off_t bytes;
apr_brigade_length(body_brigade, 1, &bytes);
if (bytes) {
const char *cl_hdr = "Content-Length", *cl_val;
cl_val = apr_off_t_toa(c->pool, bytes);
buf = apr_pstrcat(p, cl_hdr, ": ", cl_val, CRLF, NULL);
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BUCKET_INSERT_AFTER(last_header_bucket, e);
}
status = ap_pass_brigade(origin->output_filters, header_brigade);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: pass request data failed to %pI (%s)",
p_conn->addr, p_conn->name);
return status;
}
apr_brigade_cleanup(header_brigade);
}
status = ap_pass_brigade(origin->output_filters, body_brigade);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: pass request data failed to %pI (%s)",
p_conn->addr, p_conn->name);
return status;
}
apr_brigade_cleanup(body_brigade);
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,
char *server_portstr) {
conn_rec *c = r->connection;
char buffer[HUGE_STRING_LEN];
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. */
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) {
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;
} else {
/* strip connection listed hop-by-hop headers from response */
const char *buf;
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) {
const char *server_name = ap_get_server_name(r);
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
* then the server name returned by ap_get_server_name() is the
* origin server name (which does make too much sense with Via: headers)
* so we use the proxy vhost's name instead.
*/
if (server_name == r->hostname)
server_name = r->server->server_hostname;
/* create a "Via:" response header entry and merge it */
apr_table_mergen(r->headers_out, "Via",
(conf->viaopt == via_full)
? apr_psprintf(p, "%d.%d %s%s (%s)",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name,
server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name,
server_portstr)
);
}
/* cancel keepalive if HTTP/1.0 or less */
if ((major < 1) || (minor < 1)) {
p_conn->close += 1;
origin->keepalive = AP_CONN_CLOSE;
}
} else {
/* an http/0.9 response */
backasswards = 1;
r->status = 200;
r->status_line = "200 OK";
p_conn->close += 1;
}
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);
}
/* we must accept 3 kinds of date, but generate only 1 kind of date */
{
const char *buf;
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
*/
{
const char *buf;
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 *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? 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 */
!interim_response && /* 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 || ap_is_HTTP_SUCCESS(r->status)) {
/* 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) {
/* 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");
}
} 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_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_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,
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,
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 */
};
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