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mod_proxy.c
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mod_proxy.c
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/* 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.
*/
#include "mod_proxy.h"
#include "mod_core.h"
#include "apr_optional.h"
#include "scoreboard.h"
#include "mod_status.h"
#include "proxy_util.h"
#if (MODULE_MAGIC_NUMBER_MAJOR > 20020903)
#include "mod_ssl.h"
#else
APR_DECLARE_OPTIONAL_FN(int, ssl_proxy_enable, (conn_rec *));
APR_DECLARE_OPTIONAL_FN(int, ssl_engine_disable, (conn_rec *));
APR_DECLARE_OPTIONAL_FN(int, ssl_engine_set, (conn_rec *,
ap_conf_vector_t *,
int proxy, int enable));
APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
APR_DECLARE_OPTIONAL_FN(char *, ssl_var_lookup,
(apr_pool_t *, server_rec *,
conn_rec *, request_rec *, char *));
#endif
#ifndef MAX
#define MAX(x,y) ((x) >= (y) ? (x) : (y))
#endif
/*
* We do health-checks only if that (sub)module is loaded in. This
* allows for us to continue as is w/o requiring mod_watchdog for
* those implementations which aren't using health checks
*/
static APR_OPTIONAL_FN_TYPE(set_worker_hc_param) *set_worker_hc_param_f = NULL;
/* Externals */
proxy_hcmethods_t PROXY_DECLARE_DATA proxy_hcmethods[] = {
{NONE, "NONE", 1},
{TCP, "TCP", 1},
{OPTIONS, "OPTIONS", 1},
{HEAD, "HEAD", 1},
{GET, "GET", 1},
{CPING, "CPING", 0},
{PROVIDER, "PROVIDER", 0},
{EOT, NULL, 1}
};
proxy_wstat_t PROXY_DECLARE_DATA proxy_wstat_tbl[] = {
{PROXY_WORKER_INITIALIZED, PROXY_WORKER_INITIALIZED_FLAG, "Init "},
{PROXY_WORKER_IGNORE_ERRORS, PROXY_WORKER_IGNORE_ERRORS_FLAG, "Ign "},
{PROXY_WORKER_DRAIN, PROXY_WORKER_DRAIN_FLAG, "Drn "},
{PROXY_WORKER_GENERIC, PROXY_WORKER_GENERIC_FLAG, "Gen "},
{PROXY_WORKER_IN_SHUTDOWN, PROXY_WORKER_IN_SHUTDOWN_FLAG, "Shut "},
{PROXY_WORKER_DISABLED, PROXY_WORKER_DISABLED_FLAG, "Dis "},
{PROXY_WORKER_STOPPED, PROXY_WORKER_STOPPED_FLAG, "Stop "},
{PROXY_WORKER_IN_ERROR, PROXY_WORKER_IN_ERROR_FLAG, "Err "},
{PROXY_WORKER_HOT_STANDBY, PROXY_WORKER_HOT_STANDBY_FLAG, "Stby "},
{PROXY_WORKER_HOT_SPARE, PROXY_WORKER_HOT_SPARE_FLAG, "Spar "},
{PROXY_WORKER_FREE, PROXY_WORKER_FREE_FLAG, "Free "},
{PROXY_WORKER_HC_FAIL, PROXY_WORKER_HC_FAIL_FLAG, "HcFl "},
{0x0, '\0', NULL}
};
static const char * const proxy_id = "proxy";
apr_global_mutex_t *proxy_mutex = NULL;
/*
* A Web proxy module. Stages:
*
* translate_name: set filename to proxy:<URL>
* map_to_storage: run proxy_walk (rather than directory_walk/file_walk)
* can't trust directory_walk/file_walk since these are
* not in our filesystem. Prevents mod_http from serving
* the TRACE request we will set aside to handle later.
* fix_ups: convert the URL stored in the filename to the
* canonical form.
* handler: handle proxy requests
*/
/* -------------------------------------------------------------- */
/* Translate the URL into a 'filename' */
static const char *set_worker_param(apr_pool_t *p,
server_rec *s,
proxy_worker *worker,
const char *key,
const char *val)
{
int ival;
apr_interval_time_t timeout;
if (!strcasecmp(key, "loadfactor")) {
/* Normalized load factor. Used with BalancerMember,
* it is a number between 1 and 100.
*/
double fval = atof(val);
ival = fval * 100.0;
if (ival < 100 || ival > 10000)
return "LoadFactor must be a number between 1..100";
worker->s->lbfactor = ival;
}
else if (!strcasecmp(key, "retry")) {
/* If set it will give the retry timeout for the worker
* The default value is 60 seconds, meaning that if
* in error state, it will be retried after that timeout.
*/
ival = atoi(val);
if (ival < 0)
return "Retry must be a positive value";
worker->s->retry = apr_time_from_sec(ival);
worker->s->retry_set = 1;
}
else if (!strcasecmp(key, "ttl")) {
/* Time in seconds that will destroy all the connections
* that exceed the smax
*/
ival = atoi(val);
if (ival < 1)
return "TTL must be at least one second";
worker->s->ttl = apr_time_from_sec(ival);
}
else if (!strcasecmp(key, "min")) {
/* Initial number of connections to remote
*/
ival = atoi(val);
if (ival < 0)
return "Min must be a positive number";
worker->s->min = ival;
}
else if (!strcasecmp(key, "max")) {
/* Maximum number of connections to remote
*/
ival = atoi(val);
if (ival < 0)
return "Max must be a positive number";
worker->s->hmax = ival;
}
/* XXX: More inteligent naming needed */
else if (!strcasecmp(key, "smax")) {
/* Maximum number of connections to remote that
* will not be destroyed
*/
ival = atoi(val);
if (ival < 0)
return "Smax must be a positive number";
worker->s->smax = ival;
}
else if (!strcasecmp(key, "acquire")) {
/* Acquire timeout in given unit (default is milliseconds).
* If set this will be the maximum time to
* wait for a free connection.
*/
if (ap_timeout_parameter_parse(val, &timeout, "ms") != APR_SUCCESS)
return "Acquire timeout has wrong format";
if (timeout < 1000)
return "Acquire must be at least one millisecond";
worker->s->acquire = timeout;
worker->s->acquire_set = 1;
}
else if (!strcasecmp(key, "timeout")) {
/* Connection timeout in seconds.
* Defaults to server timeout.
*/
ival = atoi(val);
if (ival < 1)
return "Timeout must be at least one second";
worker->s->timeout = apr_time_from_sec(ival);
worker->s->timeout_set = 1;
}
else if (!strcasecmp(key, "iobuffersize")) {
long s = atol(val);
if (s < 512 && s) {
return "IOBufferSize must be >= 512 bytes, or 0 for system default.";
}
worker->s->io_buffer_size = (s ? s : AP_IOBUFSIZE);
worker->s->io_buffer_size_set = 1;
}
else if (!strcasecmp(key, "receivebuffersize")) {
ival = atoi(val);
if (ival < 512 && ival != 0) {
return "ReceiveBufferSize must be >= 512 bytes, or 0 for system default.";
}
worker->s->recv_buffer_size = ival;
worker->s->recv_buffer_size_set = 1;
}
else if (!strcasecmp(key, "keepalive")) {
if (!strcasecmp(val, "on"))
worker->s->keepalive = 1;
else if (!strcasecmp(val, "off"))
worker->s->keepalive = 0;
else
return "KeepAlive must be On|Off";
worker->s->keepalive_set = 1;
}
else if (!strcasecmp(key, "disablereuse")) {
if (!strcasecmp(val, "on"))
worker->s->disablereuse = 1;
else if (!strcasecmp(val, "off"))
worker->s->disablereuse = 0;
else
return "DisableReuse must be On|Off";
worker->s->disablereuse_set = 1;
}
else if (!strcasecmp(key, "enablereuse")) {
if (!strcasecmp(val, "on"))
worker->s->disablereuse = 0;
else if (!strcasecmp(val, "off"))
worker->s->disablereuse = 1;
else
return "EnableReuse must be On|Off";
worker->s->disablereuse_set = 1;
}
else if (!strcasecmp(key, "route")) {
/* Worker route.
*/
if (strlen(val) >= sizeof(worker->s->route))
return apr_psprintf(p, "Route length must be < %d characters",
(int)sizeof(worker->s->route));
PROXY_STRNCPY(worker->s->route, val);
}
else if (!strcasecmp(key, "redirect")) {
/* Worker redirection route.
*/
if (strlen(val) >= sizeof(worker->s->redirect))
return apr_psprintf(p, "Redirect length must be < %d characters",
(int)sizeof(worker->s->redirect));
PROXY_STRNCPY(worker->s->redirect, val);
}
else if (!strcasecmp(key, "status")) {
const char *v;
int mode = 1;
apr_status_t rv;
/* Worker status.
*/
for (v = val; *v; v++) {
if (*v == '+') {
mode = 1;
v++;
}
else if (*v == '-') {
mode = 0;
v++;
}
rv = ap_proxy_set_wstatus(*v, mode, worker);
if (rv != APR_SUCCESS)
return "Unknown status parameter option";
}
}
else if (!strcasecmp(key, "flushpackets")) {
if (!strcasecmp(val, "on"))
worker->s->flush_packets = flush_on;
else if (!strcasecmp(val, "off"))
worker->s->flush_packets = flush_off;
else if (!strcasecmp(val, "auto"))
worker->s->flush_packets = flush_auto;
else
return "flushpackets must be on|off|auto";
}
else if (!strcasecmp(key, "flushwait")) {
ival = atoi(val);
if (ival > 1000 || ival < 0) {
return "flushwait must be <= 1000, or 0 for system default of 10 millseconds.";
}
if (ival == 0)
worker->s->flush_wait = PROXY_FLUSH_WAIT;
else
worker->s->flush_wait = ival * 1000; /* change to microseconds */
}
else if (!strcasecmp(key, "ping")) {
/* Ping/Pong timeout in given unit (default is second).
*/
if (ap_timeout_parameter_parse(val, &timeout, "s") != APR_SUCCESS)
return "Ping/Pong timeout has wrong format";
if (timeout < 1000)
return "Ping/Pong timeout must be at least one millisecond";
worker->s->ping_timeout = timeout;
worker->s->ping_timeout_set = 1;
}
else if (!strcasecmp(key, "lbset")) {
ival = atoi(val);
if (ival < 0 || ival > 99)
return "lbset must be between 0 and 99";
worker->s->lbset = ival;
}
else if (!strcasecmp(key, "connectiontimeout")) {
/* Request timeout in given unit (default is second).
* Defaults to connection timeout
*/
if (ap_timeout_parameter_parse(val, &timeout, "s") != APR_SUCCESS)
return "Connectiontimeout has wrong format";
if (timeout < 1000)
return "Connectiontimeout must be at least one millisecond.";
worker->s->conn_timeout = timeout;
worker->s->conn_timeout_set = 1;
}
else if (!strcasecmp(key, "flusher")) {
if (strlen(val) >= sizeof(worker->s->flusher))
apr_psprintf(p, "flusher name length must be < %d characters",
(int)sizeof(worker->s->flusher));
PROXY_STRNCPY(worker->s->flusher, val);
}
else if (!strcasecmp(key, "upgrade")) {
if (PROXY_STRNCPY(worker->s->upgrade, val) != APR_SUCCESS) {
return apr_psprintf(p, "upgrade protocol length must be < %d characters",
(int)sizeof(worker->s->upgrade));
}
}
else if (!strcasecmp(key, "responsefieldsize")) {
long s = atol(val);
if (s < 0) {
return "ResponseFieldSize must be greater than 0 bytes, or 0 for system default.";
}
worker->s->response_field_size = (s ? s : HUGE_STRING_LEN);
worker->s->response_field_size_set = 1;
}
else {
if (set_worker_hc_param_f) {
return set_worker_hc_param_f(p, s, worker, key, val, NULL);
} else {
return "unknown Worker parameter";
}
}
return NULL;
}
static const char *set_balancer_param(proxy_server_conf *conf,
apr_pool_t *p,
proxy_balancer *balancer,
const char *key,
const char *val)
{
int ival;
if (!strcasecmp(key, "stickysession")) {
char *path;
/* Balancer sticky session name.
* Set to something like JSESSIONID or
* PHPSESSIONID, etc..,
*/
if (strlen(val) >= sizeof(balancer->s->sticky_path))
apr_psprintf(p, "stickysession length must be < %d characters",
(int)sizeof(balancer->s->sticky_path));
PROXY_STRNCPY(balancer->s->sticky_path, val);
PROXY_STRNCPY(balancer->s->sticky, val);
if ((path = strchr((char *)balancer->s->sticky, '|'))) {
*path++ = '\0';
PROXY_STRNCPY(balancer->s->sticky_path, path);
}
}
else if (!strcasecmp(key, "stickysessionsep")) {
/* separator/delimiter for sessionid and route,
* normally '.'
*/
if (strlen(val) != 1) {
if (!strcasecmp(val, "off"))
balancer->s->sticky_separator = 0;
else
return "stickysessionsep must be a single character or Off";
}
else
balancer->s->sticky_separator = *val;
balancer->s->sticky_separator_set = 1;
}
else if (!strcasecmp(key, "nofailover")) {
/* If set to 'on' the session will break
* if the worker is in error state or
* disabled.
*/
if (!strcasecmp(val, "on"))
balancer->s->sticky_force = 1;
else if (!strcasecmp(val, "off"))
balancer->s->sticky_force = 0;
else
return "failover must be On|Off";
balancer->s->sticky_force_set = 1;
}
else if (!strcasecmp(key, "timeout")) {
/* Balancer timeout in seconds.
* If set this will be the maximum time to
* wait for a free worker.
* Default is not to wait.
*/
ival = atoi(val);
if (ival < 1)
return "timeout must be at least one second";
balancer->s->timeout = apr_time_from_sec(ival);
}
else if (!strcasecmp(key, "maxattempts")) {
/* Maximum number of failover attempts before
* giving up.
*/
ival = atoi(val);
if (ival < 0)
return "maximum number of attempts must be a positive number";
balancer->s->max_attempts = ival;
balancer->s->max_attempts_set = 1;
}
else if (!strcasecmp(key, "lbmethod")) {
proxy_balancer_method *provider;
if (strlen(val) > (sizeof(balancer->s->lbpname)-1))
return "unknown lbmethod";
provider = ap_lookup_provider(PROXY_LBMETHOD, val, "0");
if (provider) {
balancer->lbmethod = provider;
if (PROXY_STRNCPY(balancer->s->lbpname, val) == APR_SUCCESS) {
balancer->lbmethod_set = 1;
return NULL;
}
else {
return "lbmethod name too large";
}
}
return "unknown lbmethod";
}
else if (!strcasecmp(key, "scolonpathdelim")) {
/* If set to 'on' then ';' will also be
* used as a session path separator/delim (ala
* mod_jk)
*/
if (!strcasecmp(val, "on"))
balancer->s->scolonsep = 1;
else if (!strcasecmp(val, "off"))
balancer->s->scolonsep = 0;
else
return "scolonpathdelim must be On|Off";
balancer->s->scolonsep_set = 1;
}
else if (!strcasecmp(key, "failonstatus")) {
char *val_split;
char *status;
char *tok_state;
val_split = apr_pstrdup(p, val);
balancer->errstatuses = apr_array_make(p, 1, sizeof(int));
status = apr_strtok(val_split, ", ", &tok_state);
while (status != NULL) {
ival = atoi(status);
if (ap_is_HTTP_VALID_RESPONSE(ival)) {
*(int *)apr_array_push(balancer->errstatuses) = ival;
}
else {
return "failonstatus must be one or more HTTP response codes";
}
status = apr_strtok(NULL, ", ", &tok_state);
}
}
else if (!strcasecmp(key, "failontimeout")) {
if (!strcasecmp(val, "on"))
balancer->failontimeout = 1;
else if (!strcasecmp(val, "off"))
balancer->failontimeout = 0;
else
return "failontimeout must be On|Off";
balancer->failontimeout_set = 1;
}
else if (!strcasecmp(key, "nonce")) {
if (!strcasecmp(val, "None")) {
*balancer->s->nonce = '\0';
}
else {
if (PROXY_STRNCPY(balancer->s->nonce, val) != APR_SUCCESS) {
return "Provided nonce is too large";
}
}
balancer->s->nonce_set = 1;
}
else if (!strcasecmp(key, "growth")) {
ival = atoi(val);
if (ival < 1 || ival > 100) /* arbitrary limit here */
return "growth must be between 1 and 100";
balancer->growth = ival;
balancer->growth_set = 1;
}
else if (!strcasecmp(key, "forcerecovery")) {
if (!strcasecmp(val, "on"))
balancer->s->forcerecovery = 1;
else if (!strcasecmp(val, "off"))
balancer->s->forcerecovery = 0;
else
return "forcerecovery must be On|Off";
balancer->s->forcerecovery_set = 1;
}
else {
return "unknown Balancer parameter";
}
return NULL;
}
static int alias_match(const char *uri, const char *alias_fakename)
{
const char *end_fakename = alias_fakename + strlen(alias_fakename);
const char *aliasp = alias_fakename, *urip = uri;
const char *end_uri = uri + strlen(uri);
while (aliasp < end_fakename && urip < end_uri) {
if (*aliasp == '/') {
/* any number of '/' in the alias matches any number in
* the supplied URI, but there must be at least one...
*/
if (*urip != '/')
return 0;
while (*aliasp == '/')
++aliasp;
while (*urip == '/')
++urip;
}
else {
/* Other characters are compared literally */
if (*urip++ != *aliasp++)
return 0;
}
}
/* fixup badly encoded stuff (e.g. % as last character) */
if (aliasp > end_fakename) {
aliasp = end_fakename;
}
if (urip > end_uri) {
urip = end_uri;
}
/* We reach the end of the uri before the end of "alias_fakename"
* for example uri is "/" and alias_fakename "/examples"
*/
if (urip == end_uri && aliasp != end_fakename) {
return 0;
}
/* Check last alias path component matched all the way */
if (aliasp[-1] != '/' && *urip != '\0' && *urip != '/')
return 0;
/* Return number of characters from URI which matched (may be
* greater than length of alias, since we may have matched
* doubled slashes)
*/
return urip - uri;
}
/* Detect if an absoluteURI should be proxied or not. Note that we
* have to do this during this phase because later phases are
* "short-circuiting"... i.e. translate_names will end when the first
* module returns OK. So for example, if the request is something like:
*
* GET http://othervhost/cgi-bin/printenv HTTP/1.0
*
* mod_alias will notice the /cgi-bin part and ScriptAlias it and
* short-circuit the proxy... just because of the ordering in the
* configuration file.
*/
static int proxy_detect(request_rec *r)
{
void *sconf = r->server->module_config;
proxy_server_conf *conf =
(proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
/* Ick... msvc (perhaps others) promotes ternary short results to int */
if (conf->req && r->parsed_uri.scheme) {
/* but it might be something vhosted */
if (!(r->parsed_uri.hostname
&& !strcasecmp(r->parsed_uri.scheme, ap_http_scheme(r))
&& ap_matches_request_vhost(r, r->parsed_uri.hostname,
(apr_port_t)(r->parsed_uri.port_str ? r->parsed_uri.port
: ap_default_port(r))))) {
r->proxyreq = PROXYREQ_PROXY;
r->uri = r->unparsed_uri;
r->filename = apr_pstrcat(r->pool, "proxy:", r->uri, NULL);
r->handler = "proxy-server";
}
}
/* We need special treatment for CONNECT proxying: it has no scheme part */
else if (conf->req && r->method_number == M_CONNECT
&& r->parsed_uri.hostname
&& r->parsed_uri.port_str) {
r->proxyreq = PROXYREQ_PROXY;
r->uri = r->unparsed_uri;
r->filename = apr_pstrcat(r->pool, "proxy:", r->uri, NULL);
r->handler = "proxy-server";
}
return DECLINED;
}
static const char *proxy_interpolate(request_rec *r, const char *str)
{
/* Interpolate an env str in a configuration string
* Syntax ${var} --> value_of(var)
* Method: replace one var, and recurse on remainder of string
* Nothing clever here, and crap like nested vars may do silly things
* but we'll at least avoid sending the unwary into a loop
*/
const char *start;
const char *end;
const char *var;
const char *val;
const char *firstpart;
start = ap_strstr_c(str, "${");
if (start == NULL) {
return str;
}
end = ap_strchr_c(start+2, '}');
if (end == NULL) {
return str;
}
/* OK, this is syntax we want to interpolate. Is there such a var ? */
var = apr_pstrmemdup(r->pool, start+2, end-(start+2));
val = apr_table_get(r->subprocess_env, var);
firstpart = apr_pstrmemdup(r->pool, str, (start-str));
if (val == NULL) {
return apr_pstrcat(r->pool, firstpart,
proxy_interpolate(r, end+1), NULL);
}
else {
return apr_pstrcat(r->pool, firstpart, val,
proxy_interpolate(r, end+1), NULL);
}
}
static apr_array_header_t *proxy_vars(request_rec *r,
apr_array_header_t *hdr)
{
int i;
apr_array_header_t *ret = apr_array_make(r->pool, hdr->nelts,
sizeof (struct proxy_alias));
struct proxy_alias *old = (struct proxy_alias *) hdr->elts;
for (i = 0; i < hdr->nelts; ++i) {
struct proxy_alias *newcopy = apr_array_push(ret);
newcopy->fake = (old[i].flags & PROXYPASS_INTERPOLATE)
? proxy_interpolate(r, old[i].fake) : old[i].fake;
newcopy->real = (old[i].flags & PROXYPASS_INTERPOLATE)
? proxy_interpolate(r, old[i].real) : old[i].real;
}
return ret;
}
PROXY_DECLARE(int) ap_proxy_trans_match(request_rec *r, struct proxy_alias *ent,
proxy_dir_conf *dconf)
{
int len;
const char *fake;
const char *real;
ap_regmatch_t regm[AP_MAX_REG_MATCH];
ap_regmatch_t reg1[AP_MAX_REG_MATCH];
char *found = NULL;
int mismatch = 0;
unsigned int nocanon = ent->flags & PROXYPASS_NOCANON;
const char *use_uri = nocanon ? r->unparsed_uri : r->uri;
if (dconf && (dconf->interpolate_env == 1) && (ent->flags & PROXYPASS_INTERPOLATE)) {
fake = proxy_interpolate(r, ent->fake);
real = proxy_interpolate(r, ent->real);
}
else {
fake = ent->fake;
real = ent->real;
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(03461)
"attempting to match URI path '%s' against %s '%s' for "
"proxying", r->uri, (ent->regex ? "pattern" : "prefix"),
fake);
if (ent->regex) {
if (!ap_regexec(ent->regex, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
if ((real[0] == '!') && (real[1] == '\0')) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(03462)
"proxying is explicitly disabled for URI path "
"'%s'; declining", r->uri);
return DECLINED;
}
/* test that we haven't reduced the URI */
if (nocanon && ap_regexec(ent->regex, r->unparsed_uri,
AP_MAX_REG_MATCH, reg1, 0)) {
mismatch = 1;
use_uri = r->uri;
}
found = ap_pregsub(r->pool, real, use_uri, AP_MAX_REG_MATCH,
(use_uri == r->uri) ? regm : reg1);
if (!found) {
ap_log_rerror(APLOG_MARK, APLOG_CRIT, 0, r, APLOGNO(01135)
"Substitution in regular expression failed. "
"Replacement too long?");
return HTTP_INTERNAL_SERVER_ERROR;
}
/* Note: The strcmp() below catches cases where there
* was no regex substitution. This is so cases like:
*
* ProxyPassMatch \.gif balancer://foo
*
* will work "as expected". The upshot is that the 2
* directives below act the exact same way (ie: $1 is implied):
*
* ProxyPassMatch ^(/.*\.gif)$ balancer://foo
* ProxyPassMatch ^(/.*\.gif)$ balancer://foo$1
*
* which may be confusing.
*/
if (strcmp(found, real) != 0) {
found = apr_pstrcat(r->pool, "proxy:", found, NULL);
}
else {
found = apr_pstrcat(r->pool, "proxy:", real, use_uri, NULL);
}
}
}
else {
len = alias_match(r->uri, fake);
if (len != 0) {
if ((real[0] == '!') && (real[1] == '\0')) {
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(03463)
"proxying is explicitly disabled for URI path "
"'%s'; declining", r->uri);
return DECLINED;
}
if (nocanon && len != alias_match(r->unparsed_uri, ent->fake)) {
mismatch = 1;
use_uri = r->uri;
}
found = apr_pstrcat(r->pool, "proxy:", real, use_uri + len, NULL);
}
}
if (mismatch) {
/* We made a reducing transformation, so we can't safely use
* unparsed_uri. Safe fallback is to ignore nocanon.
*/
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01136)
"Unescaped URL path matched ProxyPass; ignoring unsafe nocanon");
}
if (found) {
r->filename = found;
r->handler = "proxy-server";
r->proxyreq = PROXYREQ_REVERSE;
if (nocanon && !mismatch) {
/* mod_proxy_http needs to be told. Different module. */
apr_table_setn(r->notes, "proxy-nocanon", "1");
}
if (ent->flags & PROXYPASS_NOQUERY) {
apr_table_setn(r->notes, "proxy-noquery", "1");
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(03464)
"URI path '%s' matches proxy handler '%s'", r->uri,
found);
return OK;
}
return DONE;
}
static int proxy_trans(request_rec *r)
{
int i;
struct proxy_alias *ent;
proxy_dir_conf *dconf;
proxy_server_conf *conf;
if (r->proxyreq) {
/* someone has already set up the proxy, it was possibly ourselves
* in proxy_detect
*/
return OK;
}
if ((r->unparsed_uri[0] == '*' && r->unparsed_uri[1] == '\0')
|| !r->uri || r->uri[0] != '/') {
return DECLINED;
}
if (apr_table_get(r->subprocess_env, "no-proxy")) {
return DECLINED;
}
/* XXX: since r->uri has been manipulated already we're not really
* compliant with RFC1945 at this point. But this probably isn't
* an issue because this is a hybrid proxy/origin server.
*/
dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
/* short way - this location is reverse proxied? */
if (dconf->alias) {
int rv = ap_proxy_trans_match(r, dconf->alias, dconf);
if (DONE != rv) {
return rv;
}
}
conf = (proxy_server_conf *) ap_get_module_config(r->server->module_config,
&proxy_module);
/* long way - walk the list of aliases, find a match */
if (conf->aliases->nelts) {
ent = (struct proxy_alias *) conf->aliases->elts;
for (i = 0; i < conf->aliases->nelts; i++) {
int rv = ap_proxy_trans_match(r, &ent[i], dconf);
if (DONE != rv) {
return rv;
}
}
}
return DECLINED;
}
static int proxy_walk(request_rec *r)
{
proxy_server_conf *sconf = ap_get_module_config(r->server->module_config,
&proxy_module);
ap_conf_vector_t *per_dir_defaults = r->per_dir_config;
ap_conf_vector_t **sec_proxy = (ap_conf_vector_t **) sconf->sec_proxy->elts;
ap_conf_vector_t *entry_config;
proxy_dir_conf *entry_proxy;
int num_sec = sconf->sec_proxy->nelts;
/* XXX: shouldn't we use URI here? Canonicalize it first?
* Pass over "proxy:" prefix
*/
const char *proxyname = r->filename + 6;
int j;
apr_pool_t *rxpool = NULL;
for (j = 0; j < num_sec; ++j)
{
int nmatch = 0;
int i;
ap_regmatch_t *pmatch = NULL;
entry_config = sec_proxy[j];
entry_proxy = ap_get_module_config(entry_config, &proxy_module);
if (entry_proxy->r) {
if (entry_proxy->refs && entry_proxy->refs->nelts) {
if (!rxpool) {
apr_pool_create(&rxpool, r->pool);
}
nmatch = entry_proxy->refs->nelts;
pmatch = apr_palloc(rxpool, nmatch*sizeof(ap_regmatch_t));
}
if (ap_regexec(entry_proxy->r, proxyname, nmatch, pmatch, 0)) {
continue;
}
for (i = 0; i < nmatch; i++) {
if (pmatch[i].rm_so >= 0 && pmatch[i].rm_eo >= 0 &&
((const char **)entry_proxy->refs->elts)[i]) {
apr_table_setn(r->subprocess_env,
((const char **)entry_proxy->refs->elts)[i],
apr_pstrndup(r->pool,
proxyname + pmatch[i].rm_so,
pmatch[i].rm_eo - pmatch[i].rm_so));
}
}
}
else if (
/* XXX: What about case insensitive matching ???
* Compare regex, fnmatch or string as appropriate
* If the entry doesn't relate, then continue
*/
entry_proxy->p_is_fnmatch ? apr_fnmatch(entry_proxy->p,
proxyname, 0) :
strncmp(proxyname, entry_proxy->p,
strlen(entry_proxy->p))) {
continue;
}
per_dir_defaults = ap_merge_per_dir_configs(r->pool, per_dir_defaults,
entry_config);
}
r->per_dir_config = per_dir_defaults;
if (rxpool) {
apr_pool_destroy(rxpool);
}
return OK;
}
static int proxy_map_location(request_rec *r)
{
int access_status;
if (!r->proxyreq || !r->filename || strncmp(r->filename, "proxy:", 6) != 0)
return DECLINED;
/* Don't let the core or mod_http map_to_storage hooks handle this,
* We don't need directory/file_walk, and we want to TRACE on our own.
*/
if ((access_status = proxy_walk(r))) {
ap_die(access_status, r);
return access_status;
}
return OK;
}
/* -------------------------------------------------------------- */
/* Fixup the filename */
/*
* Canonicalise the URL
*/
static int proxy_fixup(request_rec *r)
{
char *url, *p;
int access_status;
proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
&proxy_module);
if (!r->proxyreq || !r->filename || strncmp(r->filename, "proxy:", 6) != 0)
return DECLINED;
/* XXX: Shouldn't we try this before we run the proxy_walk? */
url = &r->filename[6];
if ((dconf->interpolate_env == 1) && (r->proxyreq == PROXYREQ_REVERSE)) {
/* create per-request copy of reverse proxy conf,
* and interpolate vars in it
*/
proxy_req_conf *rconf = apr_palloc(r->pool, sizeof(proxy_req_conf));
ap_set_module_config(r->request_config, &proxy_module, rconf);
rconf->raliases = proxy_vars(r, dconf->raliases);
rconf->cookie_paths = proxy_vars(r, dconf->cookie_paths);
rconf->cookie_domains = proxy_vars(r, dconf->cookie_domains);
}
/* canonicalise each specific scheme */
if ((access_status = proxy_run_canon_handler(r, url))) {
return access_status;
}
p = strchr(url, ':');
if (p == NULL || p == url)
return HTTP_BAD_REQUEST;
return OK; /* otherwise; we've done the best we can */
}
/* Send a redirection if the request contains a hostname which is not */
/* fully qualified, i.e. doesn't have a domain name appended. Some proxy */
/* servers like Netscape's allow this and access hosts from the local */
/* domain in this case. I think it is better to redirect to a FQDN, since */
/* these will later be found in the bookmarks files. */
/* The "ProxyDomain" directive determines what domain will be appended */
static int proxy_needsdomain(request_rec *r, const char *url, const char *domain)
{
char *nuri;
const char *ref;
/* We only want to worry about GETs */
if (!r->proxyreq || r->method_number != M_GET || !r->parsed_uri.hostname)
return DECLINED;
/* If host does contain a dot already, or it is "localhost", decline */
if (strchr(r->parsed_uri.hostname, '.') != NULL /* has domain, or IPv4 literal */
|| strchr(r->parsed_uri.hostname, ':') != NULL /* IPv6 literal */
|| strcasecmp(r->parsed_uri.hostname, "localhost") == 0)
return DECLINED; /* host name has a dot already */
ref = apr_table_get(r->headers_in, "Referer");
/* Reassemble the request, but insert the domain after the host name */
/* Note that the domain name always starts with a dot */
r->parsed_uri.hostname = apr_pstrcat(r->pool, r->parsed_uri.hostname,
domain, NULL);
nuri = apr_uri_unparse(r->pool,
&r->parsed_uri,
APR_URI_UNP_REVEALPASSWORD);
apr_table_setn(r->headers_out, "Location", nuri);
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01138)
"Domain missing: %s sent to %s%s%s", r->uri,
apr_uri_unparse(r->pool, &r->parsed_uri,
APR_URI_UNP_OMITUSERINFO),
ref ? " from " : "", ref ? ref : "");