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mod_rewrite.c
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mod_rewrite.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.
*/
/* _ _ _
* _ __ ___ ___ __| | _ __ _____ ___ __(_) |_ ___
* | '_ ` _ \ / _ \ / _` | | '__/ _ \ \ /\ / / '__| | __/ _ \
* | | | | | | (_) | (_| | | | | __/\ V V /| | | | || __/
* |_| |_| |_|\___/ \__,_|___|_| \___| \_/\_/ |_| |_|\__\___|
* |_____|
*
* URL Rewriting Module
*
* This module uses a rule-based rewriting engine (based on a
* regular-expression parser) to rewrite requested URLs on the fly.
*
* It supports an unlimited number of additional rule conditions (which can
* operate on a lot of variables, even on HTTP headers) for granular
* matching and even external database lookups (either via plain text
* tables, DBM hash files or even external processes) for advanced URL
* substitution.
*
* It operates on the full URLs (including the PATH_INFO part) both in
* per-server context (httpd.conf) and per-dir context (.htaccess) and even
* can generate QUERY_STRING parts on result. The rewriting result finally
* can lead to internal subprocessing, external request redirection or even
* to internal proxy throughput.
*
* This module was originally written in April 1996 and
* gifted exclusively to the The Apache Software Foundation in July 1997 by
*
* Ralf S. Engelschall
* rse engelschall.com
* www.engelschall.com
*/
/*
* Based on the code of Apache Httpd, Written by:
* James Lee <jsandjh@gmail.com>
*/
#include "apr.h"
#include "apr_strings.h"
#include "apr_hash.h"
#include "apr_user.h"
#include "apr_lib.h"
#include "apr_signal.h"
#include "apr_global_mutex.h"
#include "apr_dbm.h"
#include <stdlib.h>
#include <stdio.h>
#if APR_HAS_THREADS
#include "apr_thread_mutex.h"
#endif
#define APR_WANT_MEMFUNC
#define APR_WANT_STRFUNC
#define APR_WANT_IOVEC
#include "apr_want.h"
/* XXX: Do we really need these headers? */
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_STDARG_H
#include <stdarg.h>
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_CTYPE_H
#include <ctype.h>
#endif
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_vhost.h"
#include "mod_ssl.h"
#include "mod_rewrite.h"
#ifdef AP_NEED_SET_MUTEX_PERMS
#include "unixd.h"
#endif
/*
* in order to improve performance on running production systems, you
* may strip all rewritelog code entirely from mod_rewrite by using the
* -DREWRITELOG_DISABLED compiler option.
*
* DO NOT USE THIS OPTION FOR PUBLIC BINARY RELEASES. Otherwise YOU are
* responsible for answering all the mod_rewrite questions out there.
*/
#ifndef REWRITELOG_DISABLED
#define rewritelog(x) do_rewritelog x
#define REWRITELOG_MODE ( APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD )
#define REWRITELOG_FLAGS ( APR_WRITE | APR_APPEND | APR_CREATE )
#else /* !REWRITELOG_DISABLED */
#define rewritelog(x)
#endif /* REWRITELOG_DISABLED */
/* remembered mime-type for [T=...] */
#define REWRITE_FORCED_MIMETYPE_NOTEVAR "rewrite-forced-mimetype"
#define REWRITE_FORCED_HANDLER_NOTEVAR "rewrite-forced-handler"
#define ENVVAR_SCRIPT_URL "SCRIPT_URL"
#define REDIRECT_ENVVAR_SCRIPT_URL "REDIRECT_" ENVVAR_SCRIPT_URL
#define ENVVAR_SCRIPT_URI "SCRIPT_URI"
#define CONDFLAG_NONE 1<<0
#define CONDFLAG_NOCASE 1<<1
#define CONDFLAG_NOTMATCH 1<<2
#define CONDFLAG_ORNEXT 1<<3
#define CONDFLAG_NOVARY 1<<4
#define RULEFLAG_NONE 1<<0
#define RULEFLAG_FORCEREDIRECT 1<<1
#define RULEFLAG_LASTRULE 1<<2
#define RULEFLAG_NEWROUND 1<<3
#define RULEFLAG_CHAIN 1<<4
#define RULEFLAG_IGNOREONSUBREQ 1<<5
#define RULEFLAG_NOTMATCH 1<<6
#define RULEFLAG_PROXY 1<<7
#define RULEFLAG_PASSTHROUGH 1<<8
#define RULEFLAG_QSAPPEND 1<<9
#define RULEFLAG_NOCASE 1<<10
#define RULEFLAG_NOESCAPE 1<<11
#define RULEFLAG_NOSUB 1<<12
#define RULEFLAG_STATUS 1<<13
#define RULEFLAG_ESCAPEBACKREF 1<<14
#define RULEFLAG_DISCARDPATHINFO 1<<15
/* return code of the rewrite rule
* the result may be escaped - or not
*/
#define ACTION_NORMAL 1<<0
#define ACTION_NOESCAPE 1<<1
#define ACTION_STATUS 1<<2
#define MAPTYPE_TXT 1<<0
#define MAPTYPE_DBM 1<<1
#define MAPTYPE_PRG 1<<2
#define MAPTYPE_INT 1<<3
#define MAPTYPE_RND 1<<4
#define ENGINE_DISABLED 1<<0
#define ENGINE_ENABLED 1<<1
#define OPTION_NONE 1<<0
#define OPTION_INHERIT 1<<1
#ifndef RAND_MAX
#define RAND_MAX 32767
#endif
/* max cookie size in rfc 2109 */
/* XXX: not used at all. We should do a check somewhere and/or cut the cookie */
#define MAX_COOKIE_LEN 4096
/* max line length (incl.\n) in text rewrite maps */
#ifndef REWRITE_MAX_TXT_MAP_LINE
#define REWRITE_MAX_TXT_MAP_LINE 1024
#endif
/* buffer length for prg rewrite maps */
#ifndef REWRITE_PRG_MAP_BUF
#define REWRITE_PRG_MAP_BUF 1024
#endif
/* for better readbility */
#define LEFT_CURLY '{'
#define RIGHT_CURLY '}'
/*
* expansion result items on the stack to save some cycles
*
* (5 == about 2 variables like "foo%{var}bar%{var}baz")
*/
#define SMALL_EXPANSION 5
/*
* check that a subrequest won't cause infinite recursion
*
* either not in a subrequest, or in a subrequest
* and URIs aren't NULL and sub/main URIs differ
*/
#define subreq_ok(r) (!r->main || \
(r->main->uri && r->uri && strcmp(r->main->uri, r->uri)))
/* jinhu added */
#define APACHE2NGINX
/*
* +-------------------------------------------------------+
* | |
* | Types and Structures
* | |
* +-------------------------------------------------------+
*/
typedef struct {
const char *datafile; /* filename for map data files */
const char *dbmtype; /* dbm type for dbm map data files */
const char *checkfile; /* filename to check for map existence */
const char *cachename; /* for cached maps (txt/rnd/dbm) */
int type; /* the type of the map */
apr_file_t *fpin; /* in file pointer for program maps */
apr_file_t *fpout; /* out file pointer for program maps */
apr_file_t *fperr; /* err file pointer for program maps */
char *(*func)(request_rec *, /* function pointer for internal maps */
char *);
char **argv; /* argv of the external rewrite map */
const char *checkfile2; /* filename to check for map existence
NULL if only one file */
} rewritemap_entry;
/* special pattern types for RewriteCond */
typedef enum {
CONDPAT_REGEX = 0,
CONDPAT_FILE_EXISTS,
CONDPAT_FILE_SIZE,
CONDPAT_FILE_LINK,
CONDPAT_FILE_DIR,
CONDPAT_FILE_XBIT,
CONDPAT_LU_URL,
CONDPAT_LU_FILE,
CONDPAT_STR_GT,
CONDPAT_STR_LT,
CONDPAT_STR_EQ
} pattern_type;
typedef struct {
char *input; /* Input string of RewriteCond */
char *pattern; /* the RegExp pattern string */
ap_regex_t *regexp; /* the precompiled regexp */
int flags; /* Flags which control the match */
pattern_type ptype; /* pattern type */
} rewritecond_entry;
/* single linked list for env vars and cookies */
typedef struct data_item {
struct data_item *next;
char *data;
} data_item;
typedef struct {
apr_array_header_t *rewriteconds;/* the corresponding RewriteCond entries */
char *pattern; /* the RegExp pattern string */
ap_regex_t *regexp; /* the RegExp pattern compilation */
char *output; /* the Substitution string */
int flags; /* Flags which control the substitution */
char *forced_mimetype; /* forced MIME type of substitution */
char *forced_handler; /* forced content handler of subst. */
int forced_responsecode; /* forced HTTP response status */
data_item *env; /* added environment variables */
data_item *cookie; /* added cookies */
int skip; /* number of next rules to skip */
} rewriterule_entry;
typedef struct {
int state; /* the RewriteEngine state */
int options; /* the RewriteOption state */
#ifndef REWRITELOG_DISABLED
const char *rewritelogfile; /* the RewriteLog filename */
apr_file_t *rewritelogfp; /* the RewriteLog open filepointer */
int rewriteloglevel; /* the RewriteLog level of verbosity */
#endif
apr_hash_t *rewritemaps; /* the RewriteMap entries */
apr_array_header_t *rewriteconds; /* the RewriteCond entries (temp.) */
apr_array_header_t *rewriterules; /* the RewriteRule entries */
server_rec *server; /* the corresponding server indicator */
} rewrite_server_conf;
typedef struct {
int state; /* the RewriteEngine state */
int options; /* the RewriteOption state */
apr_array_header_t *rewriteconds; /* the RewriteCond entries (temp.) */
apr_array_header_t *rewriterules; /* the RewriteRule entries */
char *directory; /* the directory where it applies */
const char *baseurl; /* the base-URL where it applies */
} rewrite_perdir_conf;
/* the (per-child) cache structures.
*/
typedef struct cache {
apr_pool_t *pool;
apr_hash_t *maps;
#if APR_HAS_THREADS
apr_thread_mutex_t *lock;
#endif
} cache;
/* cached maps contain an mtime for the whole map and live in a subpool
* of the cachep->pool. That makes it easy to forget them if necessary.
*/
typedef struct {
apr_time_t mtime;
apr_pool_t *pool;
apr_hash_t *entries;
} cachedmap;
/* the regex structure for the
* substitution of backreferences
*/
typedef struct backrefinfo {
char *source;
int nsub;
ap_regmatch_t regmatch[AP_MAX_REG_MATCH];
} backrefinfo;
/* single linked list used for
* variable expansion
*/
typedef struct result_list {
struct result_list *next;
apr_size_t len;
const char *string;
} result_list;
/* context structure for variable lookup and expansion
*/
typedef struct {
request_rec *r;
const char *uri;
const char *vary_this;
const char *vary;
char *perdir;
backrefinfo briRR;
backrefinfo briRC;
} rewrite_ctx;
/*
* +-------------------------------------------------------+
* | |
* | static module data
* | |
* +-------------------------------------------------------+
*/
/* the global module structure */
module AP_MODULE_DECLARE_DATA rewrite_module;
/* rewritemap int: handler function registry */
static apr_hash_t *mapfunc_hash;
/* the cache */
static cache *cachep;
/* whether proxy module is available or not */
static int proxy_available;
/* whether random seed can be reaped */
static int rewrite_rand_init_done = 0;
/* Locks/Mutexes */
static const char *lockname;
static apr_global_mutex_t *rewrite_mapr_lock_acquire = NULL;
/* Optional functions imported from mod_ssl when loaded: */
static APR_OPTIONAL_FN_TYPE(ssl_var_lookup) *rewrite_ssl_lookup = NULL;
static APR_OPTIONAL_FN_TYPE(ssl_is_https) *rewrite_is_https = NULL;
static char *escape_uri(apr_pool_t *p, const char *path);
/*
* +-------------------------------------------------------+
* | |
* | rewriting logfile support
* | |
* +-------------------------------------------------------+
*/
#ifndef REWRITELOG_DISABLED
#ifndef APACHE2NGINX
static char *current_logtime(request_rec *r)
{
apr_time_exp_t t;
char tstr[80];
apr_size_t len;
apr_time_exp_lt(&t, apr_time_now());
apr_strftime(tstr, &len, sizeof(tstr), "[%d/%b/%Y:%H:%M:%S ", &t);
apr_snprintf(tstr+len, sizeof(tstr)-len, "%c%.2d%.2d]",
t.tm_gmtoff < 0 ? '-' : '+',
t.tm_gmtoff / (60*60), t.tm_gmtoff % (60*60));
return apr_pstrdup(r->pool, tstr);
}
static int open_rewritelog(server_rec *s, apr_pool_t *p)
{
rewrite_server_conf *conf;
const char *fname;
conf = ap_get_module_config(s->module_config, &rewrite_module);
/* - no logfile configured
* - logfilename empty
* - virtual log shared w/ main server
*/
if (!conf->rewritelogfile || !*conf->rewritelogfile || conf->rewritelogfp) {
return 1;
}
if (*conf->rewritelogfile == '|') {
piped_log *pl;
fname = ap_server_root_relative(p, conf->rewritelogfile+1);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_ERR, APR_EBADPATH, s,
"mod_rewrite: Invalid RewriteLog "
"path %s", conf->rewritelogfile+1);
return 0;
}
if ((pl = ap_open_piped_log(p, fname)) == NULL) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
"mod_rewrite: could not open reliable pipe "
"to RewriteLog filter %s", fname);
return 0;
}
conf->rewritelogfp = ap_piped_log_write_fd(pl);
}
else {
apr_status_t rc;
fname = ap_server_root_relative(p, conf->rewritelogfile);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_ERR, APR_EBADPATH, s,
"mod_rewrite: Invalid RewriteLog "
"path %s", conf->rewritelogfile);
return 0;
}
if ((rc = apr_file_open(&conf->rewritelogfp, fname,
REWRITELOG_FLAGS, REWRITELOG_MODE, p))
!= APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rc, s,
"mod_rewrite: could not open RewriteLog "
"file %s", fname);
return 0;
}
}
return 1;
}
#endif //APACHE2NGINX
#ifndef APACHE2NGINX
static void do_rewritelog(request_rec *r, int level, char *perdir,
const char *fmt, ...)
{
rewrite_server_conf *conf;
char *logline, *text;
const char *rhost, *rname;
apr_size_t nbytes;
int redir;
request_rec *req;
va_list ap;
conf = ap_get_module_config(r->server->module_config, &rewrite_module);
if (!conf->rewritelogfp || level > conf->rewriteloglevel) {
return;
}
rhost = ap_get_remote_host(r->connection, r->per_dir_config,
REMOTE_NOLOOKUP, NULL);
rname = ap_get_remote_logname(r);
for (redir=0, req=r; req->prev; req = req->prev) {
++redir;
}
va_start(ap, fmt);
text = apr_pvsprintf(r->pool, fmt, ap);
va_end(ap);
logline = apr_psprintf(r->pool, "%s %s %s %s [%s/sid#%pp][rid#%pp/%s%s%s] "
"(%d) %s%s%s%s" APR_EOL_STR,
rhost ? rhost : "UNKNOWN-HOST",
rname ? rname : "-",
r->user ? (*r->user ? r->user : "\"\"") : "-",
current_logtime(r),
ap_get_server_name(r),
(void *)(r->server),
(void *)r,
r->main ? "subreq" : "initial",
redir ? "/redir#" : "",
redir ? apr_itoa(r->pool, redir) : "",
level,
perdir ? "[perdir " : "",
perdir ? perdir : "",
perdir ? "] ": "",
text);
nbytes = strlen(logline);
apr_file_write(conf->rewritelogfp, logline, &nbytes);
return;
}
#endif /* APACHE2NGINX */
#endif /* !REWRITELOG_DISABLED */
#ifndef APACHE2NGINX
/*
* +-------------------------------------------------------+
* | |
* | URI and path functions
* | |
* +-------------------------------------------------------+
*/
/* return number of chars of the scheme (incl. '://')
* if the URI is absolute (includes a scheme etc.)
* otherwise 0.
*
* NOTE: If you add new schemes here, please have a
* look at escape_absolute_uri and splitout_queryargs.
* Not every scheme takes query strings and some schemes
* may be handled in a special way.
*
* XXX: we may consider a scheme registry, perhaps with
* appropriate escape callbacks to allow other modules
* to extend mod_rewrite at runtime.
*/
static unsigned is_absolute_uri(char *uri)
{
/* fast exit */
if (*uri == '/' || strlen(uri) <= 5) {
return 0;
}
switch (*uri++) {
case 'a':
case 'A':
if (!strncasecmp(uri, "jp://", 5)) { /* ajp:// */
return 6;
}
case 'b':
case 'B':
if (!strncasecmp(uri, "alancer://", 10)) { /* balancer:// */
return 11;
}
break;
case 'f':
case 'F':
if (!strncasecmp(uri, "tp://", 5)) { /* ftp:// */
return 6;
}
break;
case 'g':
case 'G':
if (!strncasecmp(uri, "opher://", 8)) { /* gopher:// */
return 9;
}
break;
case 'h':
case 'H':
if (!strncasecmp(uri, "ttp://", 6)) { /* http:// */
return 7;
}
else if (!strncasecmp(uri, "ttps://", 7)) { /* https:// */
return 8;
}
break;
case 'l':
case 'L':
if (!strncasecmp(uri, "dap://", 6)) { /* ldap:// */
return 7;
}
break;
case 'm':
case 'M':
if (!strncasecmp(uri, "ailto:", 6)) { /* mailto: */
return 7;
}
break;
case 'n':
case 'N':
if (!strncasecmp(uri, "ews:", 4)) { /* news: */
return 5;
}
else if (!strncasecmp(uri, "ntp://", 6)) { /* nntp:// */
return 7;
}
break;
case 's':
case 'S':
if (!strncasecmp(uri, "cgi://", 6)) { /* scgi:// */
return 7;
}
break;
}
return 0;
}
static const char c2x_table[] = "0123456789abcdef";
static APR_INLINE unsigned char *c2x(unsigned what, unsigned char prefix,
unsigned char *where)
{
#if APR_CHARSET_EBCDIC
what = apr_xlate_conv_byte(ap_hdrs_to_ascii, (unsigned char)what);
#endif /*APR_CHARSET_EBCDIC*/
*where++ = prefix;
*where++ = c2x_table[what >> 4];
*where++ = c2x_table[what & 0xf];
return where;
}
/*
* Escapes a uri in a similar way as php's urlencode does.
* Based on ap_os_escape_path in server/util.c
*/
static char *escape_uri(apr_pool_t *p, const char *path) {
char *copy = apr_palloc(p, 3 * strlen(path) + 3);
const unsigned char *s = (const unsigned char *)path;
unsigned char *d = (unsigned char *)copy;
unsigned c;
while ((c = *s)) {
if (apr_isalnum(c) || c == '_') {
*d++ = c;
}
else if (c == ' ') {
*d++ = '+';
}
else {
d = c2x(c, '%', d);
}
++s;
}
*d = '\0';
return copy;
}
/*
* escape absolute uri, which may or may not be path oriented.
* So let's handle them differently.
*/
static char *escape_absolute_uri(apr_pool_t *p, char *uri, unsigned scheme)
{
char *cp;
/* be safe.
* NULL should indicate elsewhere, that something's wrong
*/
if (!scheme || strlen(uri) < scheme) {
return NULL;
}
cp = uri + scheme;
/* scheme with authority part? */
if (cp[-1] == '/') {
/* skip host part */
while (*cp && *cp != '/') {
++cp;
}
/* nothing after the hostpart. ready! */
if (!*cp || !*++cp) {
return apr_pstrdup(p, uri);
}
/* remember the hostname stuff */
scheme = cp - uri;
/* special thing for ldap.
* The parts are separated by question marks. From RFC 2255:
* ldapurl = scheme "://" [hostport] ["/"
* [dn ["?" [attributes] ["?" [scope]
* ["?" [filter] ["?" extensions]]]]]]
*/
if (!strncasecmp(uri, "ldap", 4)) {
char *token[5];
int c = 0;
token[0] = cp = apr_pstrdup(p, cp);
while (*cp && c < 4) {
if (*cp == '?') {
token[++c] = cp + 1;
*cp = '\0';
}
++cp;
}
return apr_pstrcat(p, apr_pstrndup(p, uri, scheme),
ap_escape_uri(p, token[0]),
(c >= 1) ? "?" : NULL,
(c >= 1) ? ap_escape_uri(p, token[1]) : NULL,
(c >= 2) ? "?" : NULL,
(c >= 2) ? ap_escape_uri(p, token[2]) : NULL,
(c >= 3) ? "?" : NULL,
(c >= 3) ? ap_escape_uri(p, token[3]) : NULL,
(c >= 4) ? "?" : NULL,
(c >= 4) ? ap_escape_uri(p, token[4]) : NULL,
NULL);
}
}
/* Nothing special here. Apply normal escaping. */
return apr_pstrcat(p, apr_pstrndup(p, uri, scheme),
ap_escape_uri(p, cp), NULL);
}
/*
* split out a QUERY_STRING part from
* the current URI string
*/
static void splitout_queryargs(request_rec *r, int qsappend)
{
char *q;
/* don't touch, unless it's an http or mailto URL.
* See RFC 1738 and RFC 2368.
*/
if (is_absolute_uri(r->filename)
&& strncasecmp(r->filename, "ajp", 3)
&& strncasecmp(r->filename, "balancer", 8)
&& strncasecmp(r->filename, "http", 4)
&& strncasecmp(r->filename, "mailto", 6)) {
r->args = NULL; /* forget the query that's still flying around */
return;
}
q = ap_strchr(r->filename, '?');
if (q != NULL) {
char *olduri;
apr_size_t len;
olduri = apr_pstrdup(r->pool, r->filename);
*q++ = '\0';
if (qsappend) {
r->args = apr_pstrcat(r->pool, q, "&", r->args, NULL);
}
else {
r->args = apr_pstrdup(r->pool, q);
}
len = strlen(r->args);
if (!len) {
r->args = NULL;
}
else if (r->args[len-1] == '&') {
r->args[len-1] = '\0';
}
rewritelog((r, 3, NULL, "split uri=%s -> uri=%s, args=%s", olduri,
r->filename, r->args ? r->args : "<none>"));
}
return;
}
/*
* strip 'http[s]://ourhost/' from URI
*/
static void reduce_uri(request_rec *r)
{
char *cp;
apr_size_t l;
cp = (char *)ap_http_scheme(r);
l = strlen(cp);
if ( strlen(r->filename) > l+3
&& strncasecmp(r->filename, cp, l) == 0
&& r->filename[l] == ':'
&& r->filename[l+1] == '/'
&& r->filename[l+2] == '/' ) {
unsigned short port;
char *portp, *host, *url, *scratch;
scratch = apr_pstrdup(r->pool, r->filename); /* our scratchpad */
/* cut the hostname and port out of the URI */
cp = host = scratch + l + 3; /* 3 == strlen("://") */
while (*cp && *cp != '/' && *cp != ':') {
++cp;
}
if (*cp == ':') { /* additional port given */
*cp++ = '\0';
portp = cp;
while (*cp && *cp != '/') {
++cp;
}
*cp = '\0';
port = atoi(portp);
url = r->filename + (cp - scratch);
if (!*url) {
url = "/";
}
}
else if (*cp == '/') { /* default port */
*cp = '\0';
port = ap_default_port(r);
url = r->filename + (cp - scratch);
}
else {
port = ap_default_port(r);
url = "/";
}
/* now check whether we could reduce it to a local path... */
if (ap_matches_request_vhost(r, host, port)) {
rewritelog((r, 3, NULL, "reduce %s -> %s", r->filename, url));
r->filename = apr_pstrdup(r->pool, url);
}
}
return;
}
/*
* add 'http[s]://ourhost[:ourport]/' to URI
* if URI is still not fully qualified
*/
static void fully_qualify_uri(request_rec *r)
{
if (r->method_number == M_CONNECT) {
return;
}
else if (!is_absolute_uri(r->filename)) {
const char *thisserver;
char *thisport;
int port;
thisserver = ap_get_server_name(r);
port = ap_get_server_port(r);
thisport = ap_is_default_port(port, r)
? ""
: apr_psprintf(r->pool, ":%u", port);
r->filename = apr_psprintf(r->pool, "%s://%s%s%s%s",
ap_http_scheme(r), thisserver, thisport,
(*r->filename == '/') ? "" : "/",
r->filename);
}
return;
}
/*
* stat() only the first segment of a path
*/
static int prefix_stat(const char *path, apr_pool_t *pool)
{
const char *curpath = path;
const char *root;
const char *slash;
char *statpath;
apr_status_t rv;
rv = apr_filepath_root(&root, &curpath, APR_FILEPATH_TRUENAME, pool);
if (rv != APR_SUCCESS) {
return 0;
}
/* let's recognize slashes only, the mod_rewrite semantics are opaque
* enough.
*/
if ((slash = ap_strchr_c(curpath, '/')) != NULL) {
rv = apr_filepath_merge(&statpath, root,
apr_pstrndup(pool, curpath,
(apr_size_t)(slash - curpath)),
APR_FILEPATH_NOTABOVEROOT |
APR_FILEPATH_NOTRELATIVE, pool);
}
else {
rv = apr_filepath_merge(&statpath, root, curpath,
APR_FILEPATH_NOTABOVEROOT |
APR_FILEPATH_NOTRELATIVE, pool);
}
if (rv == APR_SUCCESS) {
apr_finfo_t sb;
if (apr_stat(&sb, statpath, APR_FINFO_MIN, pool) == APR_SUCCESS) {
return 1;
}
}
return 0;
}
/*
* substitute the prefix path 'match' in 'input' with 'subst' (RewriteBase)
*/
static char *subst_prefix_path(request_rec *r, char *input, char *match,
const char *subst)
{
apr_size_t len = strlen(match);
if (len && match[len - 1] == '/') {
--len;
}
if (!strncmp(input, match, len) && input[len++] == '/') {
apr_size_t slen, outlen;
char *output;
rewritelog((r, 5, NULL, "strip matching prefix: %s -> %s", input,
input+len));
slen = strlen(subst);
if (slen && subst[slen - 1] != '/') {
++slen;
}
outlen = strlen(input) + slen - len;
output = apr_palloc(r->pool, outlen + 1); /* don't forget the \0 */
memcpy(output, subst, slen);
if (slen && !output[slen-1]) {
output[slen-1] = '/';
}
memcpy(output+slen, input+len, outlen - slen);
output[outlen] = '\0';
rewritelog((r, 4, NULL, "add subst prefix: %s -> %s", input+len,
output));
return output;
}
/* prefix didn't match */
return input;
}
/*
* +-------------------------------------------------------+
* | |
* | caching support
* | |
* +-------------------------------------------------------+
*/
static void set_cache_value(const char *name, apr_time_t t, char *key,
char *val)
{
cachedmap *map;
if (cachep) {
#if APR_HAS_THREADS
apr_thread_mutex_lock(cachep->lock);
#endif
map = apr_hash_get(cachep->maps, name, APR_HASH_KEY_STRING);
if (!map) {
apr_pool_t *p;
if (apr_pool_create(&p, cachep->pool) != APR_SUCCESS) {