modules/mappers/mod_alias.c

/* 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.
 */

/*
 * http_alias.c: Stuff for dealing with directory aliases
 *
 * Original by Rob McCool, rewritten in succession by David Robinson
 * and rst.
 *
 */

#include "apr_strings.h"
#include "apr_lib.h"

#define APR_WANT_STRFUNC
#include "apr_want.h"

#include "ap_config.h"
#include "httpd.h"
#include "http_core.h"
#include "http_config.h"
#include "http_request.h"
#include "http_log.h"


typedef struct {
    const char *real;
    const char *fake;
    char *handler;
    ap_regex_t *regexp;
    int redir_status;                /* 301, 302, 303, 410, etc */
} alias_entry;

typedef struct {
    apr_array_header_t *aliases;
    apr_array_header_t *redirects;
} alias_server_conf;

typedef struct {
    apr_array_header_t *redirects;
} alias_dir_conf;

module AP_MODULE_DECLARE_DATA alias_module;

static void *create_alias_config(apr_pool_t *p, server_rec *s)
{
    alias_server_conf *a =
    (alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));

    a->aliases = apr_array_make(p, 20, sizeof(alias_entry));
    a->redirects = apr_array_make(p, 20, sizeof(alias_entry));
    return a;
}

static void *create_alias_dir_config(apr_pool_t *p, char *d)
{
    alias_dir_conf *a =
    (alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
    a->redirects = apr_array_make(p, 2, sizeof(alias_entry));
    return a;
}

static void *merge_alias_config(apr_pool_t *p, void *basev, void *overridesv)
{
    alias_server_conf *a =
    (alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
    alias_server_conf *base = (alias_server_conf *) basev;
    alias_server_conf *overrides = (alias_server_conf *) overridesv;

    a->aliases = apr_array_append(p, overrides->aliases, base->aliases);
    a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
    return a;
}

static void *merge_alias_dir_config(apr_pool_t *p, void *basev, void *overridesv)
{
    alias_dir_conf *a =
    (alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
    alias_dir_conf *base = (alias_dir_conf *) basev;
    alias_dir_conf *overrides = (alias_dir_conf *) overridesv;
    a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
    return a;
}

/* need prototype for overlap check */
static int alias_matches(const char *uri, const char *alias_fakename);

static const char *add_alias_internal(cmd_parms *cmd, void *dummy,
                                      const char *f, const char *r,
                                      int use_regex)
{
    server_rec *s = cmd->server;
    alias_server_conf *conf = ap_get_module_config(s->module_config,
                                                   &alias_module);
    alias_entry *new = apr_array_push(conf->aliases);
    alias_entry *entries = (alias_entry *)conf->aliases->elts;
    int i;

    /* XX r can NOT be relative to DocumentRoot here... compat bug. */

    if (use_regex) {
        new->regexp = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
        if (new->regexp == NULL)
            return "Regular expression could not be compiled.";
        new->real = r;
    }
    else {
        /* XXX This may be optimized, but we must know that new->real
         * exists.  If so, we can dir merge later, trusing new->real
         * and just canonicalizing the remainder.  Not till I finish
         * cleaning out the old ap_canonical stuff first.
         */
        new->real = r;
    }
    new->fake = f;
    new->handler = cmd->info;

    /* check for overlapping (Script)Alias directives
     * and throw a warning if found one
     */
    if (!use_regex) {
        for (i = 0; i < conf->aliases->nelts - 1; ++i) {
            alias_entry *p = &entries[i];

            if (  (!p->regexp &&  alias_matches(f, p->fake) > 0)
                || (p->regexp && !ap_regexec(p->regexp, f, 0, NULL, 0))) {
                ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
                             "The %s directive in %s at line %d will probably "
                             "never match because it overlaps an earlier "
                             "%sAlias%s.",
                             cmd->cmd->name, cmd->directive->filename,
                             cmd->directive->line_num,
                             p->handler ? "Script" : "",
                             p->regexp ? "Match" : "");

                break; /* one warning per alias should be sufficient */
            }
        }
    }

    return NULL;
}

static const char *add_alias(cmd_parms *cmd, void *dummy, const char *f,
                             const char *r)
{
    return add_alias_internal(cmd, dummy, f, r, 0);
}

static const char *add_alias_regex(cmd_parms *cmd, void *dummy, const char *f,
                                   const char *r)
{
    return add_alias_internal(cmd, dummy, f, r, 1);
}

static const char *add_redirect_internal(cmd_parms *cmd,
                                         alias_dir_conf *dirconf,
                                         const char *arg1, const char *arg2,
                                         const char *arg3, int use_regex)
{
    alias_entry *new;
    server_rec *s = cmd->server;
    alias_server_conf *serverconf = ap_get_module_config(s->module_config,
                                                         &alias_module);
    int status = (int) (long) cmd->info;
    ap_regex_t *r = NULL;
    const char *f = arg2;
    const char *url = arg3;

    if (!arg3 && !strcasecmp(arg1, "gone")) {
        status = HTTP_GONE;
    }
    else if (arg3) {
        if (!strcasecmp(arg1, "permanent"))
            status = HTTP_MOVED_PERMANENTLY;
        else if (!strcasecmp(arg1, "temp"))
            status = HTTP_MOVED_TEMPORARILY;
        else if (!strcasecmp(arg1, "seeother"))
            status = HTTP_SEE_OTHER;
        else if (apr_isdigit(*arg1))
            status = atoi(arg1);
        else {
            return "Redirect: invalid first argument (of three)";
        }
    }
    else {
        f = arg1;
        url = arg2;
    }

    if (use_regex) {
        r = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
        if (r == NULL)
            return "Regular expression could not be compiled.";
    }

    if (ap_is_HTTP_REDIRECT(status)) {
        if (!url)
            return "URL to redirect to is missing";
        /* PR#35314: we can allow path components here;
         * they get correctly resolved to full URLs.
         */
        if (!use_regex && !ap_is_url(url) && (url[0] != '/'))
            return "Redirect to non-URL";
    }
    else {
        if (url)
            return "Redirect URL not valid for this status";
    }

    if (cmd->path)
        new = apr_array_push(dirconf->redirects);
    else
        new = apr_array_push(serverconf->redirects);

    new->fake = f;
    new->real = url;
    new->regexp = r;
    new->redir_status = status;
    return NULL;
}

static const char *add_redirect(cmd_parms *cmd, void *dirconf,
                                const char *arg1, const char *arg2,
                                const char *arg3)
{
    return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
}

static const char *add_redirect2(cmd_parms *cmd, void *dirconf,
                                 const char *arg1, const char *arg2)
{
    return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0);
}

static const char *add_redirect_regex(cmd_parms *cmd, void *dirconf,
                                      const char *arg1, const char *arg2,
                                      const char *arg3)
{
    return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
}

static const command_rec alias_cmds[] =
{
    AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF,
                  "a fakename and a realname"),
    AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF,
                  "a fakename and a realname"),
    AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
                   OR_FILEINFO,
                   "an optional status, then document to be redirected and "
                   "destination URL"),
    AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF,
                  "a regular expression and a filename"),
    AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF,
                  "a regular expression and a filename"),
    AP_INIT_TAKE23("RedirectMatch", add_redirect_regex,
                   (void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
                   "an optional status, then a regular expression and "
                   "destination URL"),
    AP_INIT_TAKE2("RedirectTemp", add_redirect2,
                  (void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
                  "a document to be redirected, then the destination URL"),
    AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
                  (void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO,
                  "a document to be redirected, then the destination URL"),
    {NULL}
};

static int alias_matches(const char *uri, const char *alias_fakename)
{
    const char *aliasp = alias_fakename, *urip = uri;

    while (*aliasp) {
        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;

            do {
                ++aliasp;
            } while (*aliasp == '/');
            do {
                ++urip;
            } while (*urip == '/');
        }
        else {
            /* Other characters are compared literally */
            if (*urip++ != *aliasp++)
                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;
}

static char *try_alias_list(request_rec *r, apr_array_header_t *aliases,
                            int doesc, int *status)
{
    alias_entry *entries = (alias_entry *) aliases->elts;
    ap_regmatch_t regm[AP_MAX_REG_MATCH];
    char *found = NULL;
    int i;

    for (i = 0; i < aliases->nelts; ++i) {
        alias_entry *p = &entries[i];
        int l;

        if (p->regexp) {
            if (!ap_regexec(p->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
                if (p->real) {
                    found = ap_pregsub(r->pool, p->real, r->uri,
                                       AP_MAX_REG_MATCH, regm);
                    if (found && doesc) {
                        apr_uri_t uri;
                        apr_uri_parse(r->pool, found, &uri);
                        /* Do not escape the query string or fragment. */
                        found = apr_uri_unparse(r->pool, &uri,
                                                APR_URI_UNP_OMITQUERY);
                        found = ap_escape_uri(r->pool, found);
                        if (uri.query) {
                            found = apr_pstrcat(r->pool, found, "?",
                                                uri.query, NULL);
                        }
                        if (uri.fragment) {
                            found = apr_pstrcat(r->pool, found, "#",
                                                uri.fragment, NULL);
                        }
                    }
                }
                else {
                    /* need something non-null */
                    found = apr_pstrdup(r->pool, "");
                }
            }
        }
        else {
            l = alias_matches(r->uri, p->fake);

            if (l > 0) {
                if (doesc) {
                    char *escurl;
                    escurl = ap_os_escape_path(r->pool, r->uri + l, 1);

                    found = apr_pstrcat(r->pool, p->real, escurl, NULL);
                }
                else
                    found = apr_pstrcat(r->pool, p->real, r->uri + l, NULL);
            }
        }

        if (found) {
            if (p->handler) {    /* Set handler, and leave a note for mod_cgi */
                r->handler = p->handler;
                apr_table_setn(r->notes, "alias-forced-type", r->handler);
            }
            /* XXX This is as SLOW as can be, next step, we optimize
             * and merge to whatever part of the found path was already
             * canonicalized.  After I finish eliminating os canonical.
             * Better fail test for ap_server_root_relative needed here.
             */
            if (!doesc) {
                found = ap_server_root_relative(r->pool, found);
            }
            if (found) {
                *status = p->redir_status;
            }
            return found;
        }

    }

    return NULL;
}

static int translate_alias_redir(request_rec *r)
{
    ap_conf_vector_t *sconf = r->server->module_config;
    alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
    char *ret;
    int status;

    if (r->uri[0] != '/' && r->uri[0] != '\0') {
        return DECLINED;
    }

    if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
        if (ap_is_HTTP_REDIRECT(status)) {
            /* include QUERY_STRING if any */
            if (r->args) {
                ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
            }
            apr_table_setn(r->headers_out, "Location", ret);
        }
        return status;
    }

    if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
        r->filename = ret;
        return OK;
    }

    return DECLINED;
}

static int fixup_redir(request_rec *r)
{
    void *dconf = r->per_dir_config;
    alias_dir_conf *dirconf =
    (alias_dir_conf *) ap_get_module_config(dconf, &alias_module);
    char *ret;
    int status;

    /* It may have changed since last time, so try again */

    if ((ret = try_alias_list(r, dirconf->redirects, 1, &status)) != NULL) {
        if (ap_is_HTTP_REDIRECT(status)) {
            if (ret[0] == '/') {
                char *orig_target = ret;

                ret = ap_construct_url(r->pool, ret, r);
                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
                              "incomplete redirection target of '%s' for "
                              "URI '%s' modified to '%s'",
                              orig_target, r->uri, ret);
            }
            if (!ap_is_url(ret)) {
                status = HTTP_INTERNAL_SERVER_ERROR;
                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                              "cannot redirect '%s' to '%s'; "
                              "target is not a valid absoluteURI or abs_path",
                              r->uri, ret);
            }
            else {
                /* append requested query only, if the config didn't
                 * supply its own.
                 */
                if (r->args && !ap_strchr(ret, '?')) {
                    ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
                }
                apr_table_setn(r->headers_out, "Location", ret);
            }
        }
        return status;
    }

    return DECLINED;
}

static void register_hooks(apr_pool_t *p)
{
    static const char * const aszSucc[]={ "mod_userdir.c",
                                          "mod_vhost_alias.c",NULL };

    ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE);
    ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE);
}

module AP_MODULE_DECLARE_DATA alias_module =
{
    STANDARD20_MODULE_STUFF,
    create_alias_dir_config,       /* dir config creater */
    merge_alias_dir_config,        /* dir merger --- default is to override */
    create_alias_config,           /* server config */
    merge_alias_config,            /* merge server configs */
    alias_cmds,                    /* command apr_table_t */
    register_hooks                 /* register hooks */
};
1	fielding	420983	/* Licensed to the Apache Software Foundation (ASF) under one or more
2			* contributor license agreements. See the NOTICE file distributed with
3			* this work for additional information regarding copyright ownership.
4			* The ASF licenses this file to You under the Apache License, Version 2.0
5			* (the "License"); you may not use this file except in compliance with
6			* the License. You may obtain a copy of the License at
7	fielding	83751	*
8	nd	102525	* http://www.apache.org/licenses/LICENSE-2.0
9	fielding	83751	*
10	nd	102525	* Unless required by applicable law or agreed to in writing, software
11			* distributed under the License is distributed on an "AS IS" BASIS,
12			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13			* See the License for the specific language governing permissions and
14			* limitations under the License.
15	fielding	83751	*/
16
17			/*
18			* http_alias.c: Stuff for dealing with directory aliases
19	jim	332306	*
20	fielding	83751	* Original by Rob McCool, rewritten in succession by David Robinson
21			* and rst.
22	jim	332306	*
23	fielding	83751	*/
24
25	rbb	85867	#include "apr_strings.h"
26	gstein	88060	#include "apr_lib.h"
27
28			#define APR_WANT_STRFUNC
29			#include "apr_want.h"
30
31	rbb	84531	#include "ap_config.h"
32	fielding	83751	#include "httpd.h"
33	coar	93143	#include "http_core.h"
34	fielding	83751	#include "http_config.h"
35	fielding	83770	#include "http_request.h"
36	coar	93137	#include "http_log.h"
37	fielding	83751
38	gstein	88060
39	fielding	83751	typedef struct {
40	ben	85644	const char *real;
41			const char *fake;
42	fielding	83751	char *handler;
43	jorton	153384	ap_regex_t *regexp;
44	jerenkrantz	95503	int redir_status; /* 301, 302, 303, 410, etc */
45	fielding	83751	} alias_entry;
46
47			typedef struct {
48	dougm	85976	apr_array_header_t *aliases;
49			apr_array_header_t *redirects;
50	fielding	83751	} alias_server_conf;
51
52			typedef struct {
53	dougm	85976	apr_array_header_t *redirects;
54	fielding	83751	} alias_dir_conf;
55
56	wrowe	86609	module AP_MODULE_DECLARE_DATA alias_module;
57	fielding	83751
58	dougm	85976	static void create_alias_config(apr_pool_t p, server_rec *s)
59	fielding	83751	{
60			alias_server_conf *a =
61	dougm	85976	(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
62	fielding	83751
63	dougm	88019	a->aliases = apr_array_make(p, 20, sizeof(alias_entry));
64			a->redirects = apr_array_make(p, 20, sizeof(alias_entry));
65	fielding	83751	return a;
66			}
67
68	dougm	85976	static void create_alias_dir_config(apr_pool_t p, char *d)
69	fielding	83751	{
70			alias_dir_conf *a =
71	dougm	85976	(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
72	dougm	88019	a->redirects = apr_array_make(p, 2, sizeof(alias_entry));
73	fielding	83751	return a;
74			}
75
76	dougm	85976	static void merge_alias_config(apr_pool_t p, void basev, void overridesv)
77	fielding	83751	{
78			alias_server_conf *a =
79	dougm	85976	(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
80	jerenkrantz	95503	alias_server_conf base = (alias_server_conf ) basev;
81			alias_server_conf overrides = (alias_server_conf ) overridesv;
82	fielding	83751
83	dougm	88019	a->aliases = apr_array_append(p, overrides->aliases, base->aliases);
84			a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
85	fielding	83751	return a;
86			}
87
88	dougm	85976	static void merge_alias_dir_config(apr_pool_t p, void basev, void overridesv)
89	fielding	83751	{
90			alias_dir_conf *a =
91	dougm	85976	(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
92	jerenkrantz	95503	alias_dir_conf base = (alias_dir_conf ) basev;
93			alias_dir_conf overrides = (alias_dir_conf ) overridesv;
94	dougm	88019	a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
95	fielding	83751	return a;
96			}
97
98	nd	98647	/* need prototype for overlap check */
99			static int alias_matches(const char uri, const char alias_fakename);
100
101	ben	85644	static const char add_alias_internal(cmd_parms cmd, void *dummy,
102	jerenkrantz	95503	const char f, const char r,
103			int use_regex)
104	fielding	83751	{
105			server_rec *s = cmd->server;
106	gstein	88225	alias_server_conf *conf = ap_get_module_config(s->module_config,
107			&alias_module);
108	dougm	88019	alias_entry *new = apr_array_push(conf->aliases);
109	nd	98647	alias_entry entries = (alias_entry )conf->aliases->elts;
110			int i;
111	fielding	83751
112			/* XX r can NOT be relative to DocumentRoot here... compat bug. */
113
114			if (use_regex) {
115	jorton	153384	new->regexp = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
116	jerenkrantz	95503	if (new->regexp == NULL)
117			return "Regular expression could not be compiled.";
118	rbb	88010	new->real = r;
119	fielding	83751	}
120	wrowe	90562	else {
121			/* XXX This may be optimized, but we must know that new->real
122			* exists. If so, we can dir merge later, trusing new->real
123			* and just canonicalizing the remainder. Not till I finish
124			* cleaning out the old ap_canonical stuff first.
125			*/
126			new->real = r;
127			}
128	fielding	83751	new->fake = f;
129			new->handler = cmd->info;
130
131	nd	98647	/* check for overlapping (Script)Alias directives
132			* and throw a warning if found one
133			*/
134			if (!use_regex) {
135			for (i = 0; i < conf->aliases->nelts - 1; ++i) {
136			alias_entry *p = &entries[i];
137
138	trawick	98741	if ( (!p->regexp && alias_matches(f, p->fake) > 0)
139			\|\| (p->regexp && !ap_regexec(p->regexp, f, 0, NULL, 0))) {
140	nd	98647	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
141	nd	102949	"The %s directive in %s at line %d will probably "
142			"never match because it overlaps an earlier "
143			"%sAlias%s.",
144			cmd->cmd->name, cmd->directive->filename,
145			cmd->directive->line_num,
146	nd	98657	p->handler ? "Script" : "",
147			p->regexp ? "Match" : "");
148	nd	98647
149			break; /* one warning per alias should be sufficient */
150			}
151			}
152			}
153
154	fielding	83751	return NULL;
155			}
156
157	ben	85644	static const char add_alias(cmd_parms cmd, void dummy, const char f,
158	jerenkrantz	95503	const char *r)
159	fielding	83751	{
160			return add_alias_internal(cmd, dummy, f, r, 0);
161			}
162
163	ben	85644	static const char add_alias_regex(cmd_parms cmd, void dummy, const char f,
164	jerenkrantz	95503	const char *r)
165	fielding	83751	{
166			return add_alias_internal(cmd, dummy, f, r, 1);
167			}
168
169	ben	85644	static const char add_redirect_internal(cmd_parms cmd,
170	jerenkrantz	95503	alias_dir_conf *dirconf,
171	jim	332306	const char arg1, const char arg2,
172	trawick	85627	const char *arg3, int use_regex)
173	fielding	83751	{
174			alias_entry *new;
175			server_rec *s = cmd->server;
176	gstein	88225	alias_server_conf *serverconf = ap_get_module_config(s->module_config,
177			&alias_module);
178	fielding	83751	int status = (int) (long) cmd->info;
179	jorton	153384	ap_regex_t *r = NULL;
180	ben	85644	const char *f = arg2;
181			const char *url = arg3;
182	fielding	83751
183	jim	780648	if (!arg3 && !strcasecmp(arg1, "gone")) {
184			status = HTTP_GONE;
185			}
186			else if (arg3) {
187			if (!strcasecmp(arg1, "permanent"))
188	niq	778942	status = HTTP_MOVED_PERMANENTLY;
189			else if (!strcasecmp(arg1, "temp"))
190			status = HTTP_MOVED_TEMPORARILY;
191			else if (!strcasecmp(arg1, "seeother"))
192			status = HTTP_SEE_OTHER;
193			else if (apr_isdigit(*arg1))
194			status = atoi(arg1);
195			else {
196			return "Redirect: invalid first argument (of three)";
197			}
198			}
199	fielding	83751	else {
200	jerenkrantz	95503	f = arg1;
201			url = arg2;
202	fielding	83751	}
203
204			if (use_regex) {
205	jorton	153384	r = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
206	jerenkrantz	95503	if (r == NULL)
207			return "Regular expression could not be compiled.";
208	fielding	83751	}
209
210			if (ap_is_HTTP_REDIRECT(status)) {
211	jerenkrantz	95503	if (!url)
212			return "URL to redirect to is missing";
213	niq	490142	/* PR#35314: we can allow path components here;
214			* they get correctly resolved to full URLs.
215			*/
216			if (!use_regex && !ap_is_url(url) && (url[0] != '/'))
217	jerenkrantz	95503	return "Redirect to non-URL";
218	fielding	83751	}
219			else {
220	jerenkrantz	95503	if (url)
221			return "Redirect URL not valid for this status";
222	fielding	83751	}
223
224			if (cmd->path)
225	jerenkrantz	95503	new = apr_array_push(dirconf->redirects);
226	fielding	83751	else
227	jerenkrantz	95503	new = apr_array_push(serverconf->redirects);
228	fielding	83751
229			new->fake = f;
230			new->real = url;
231			new->regexp = r;
232			new->redir_status = status;
233			return NULL;
234			}
235
236	ben	85644	static const char add_redirect(cmd_parms cmd, void *dirconf,
237			const char arg1, const char arg2,
238	jerenkrantz	95503	const char *arg3)
239	fielding	83751	{
240			return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
241			}
242
243	ben	85644	static const char add_redirect2(cmd_parms cmd, void *dirconf,
244	jerenkrantz	95503	const char arg1, const char arg2)
245	fielding	83751	{
246	ben	85644	return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0);
247			}
248
249			static const char add_redirect_regex(cmd_parms cmd, void *dirconf,
250	jerenkrantz	95503	const char arg1, const char arg2,
251			const char *arg3)
252	ben	85644	{
253	fielding	83751	return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
254			}
255
256			static const command_rec alias_cmds[] =
257			{
258	trawick	85627	AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF,
259			"a fakename and a realname"),
260			AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF,
261			"a fakename and a realname"),
262			AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
263			OR_FILEINFO,
264			"an optional status, then document to be redirected and "
265			"destination URL"),
266			AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF,
267			"a regular expression and a filename"),
268			AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF,
269			"a regular expression and a filename"),
270	jim	332306	AP_INIT_TAKE23("RedirectMatch", add_redirect_regex,
271	trawick	85627	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
272			"an optional status, then a regular expression and "
273			"destination URL"),
274	ben	85644	AP_INIT_TAKE2("RedirectTemp", add_redirect2,
275	jerenkrantz	95503	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
276	trawick	85627	"a document to be redirected, then the destination URL"),
277	jim	332306	AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
278	trawick	85627	(void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO,
279			"a document to be redirected, then the destination URL"),
280	fielding	83751	{NULL}
281			};
282
283			static int alias_matches(const char uri, const char alias_fakename)
284			{
285			const char aliasp = alias_fakename, urip = uri;
286
287	brianp	92138	while (*aliasp) {
288	jerenkrantz	95503	if (*aliasp == '/') {
289			/* any number of '/' in the alias matches any number in
290			* the supplied URI, but there must be at least one...
291			*/
292			if (*urip != '/')
293			return 0;
294	fielding	83751
295	brianp	95584	do {
296	jerenkrantz	95503	++aliasp;
297	brianp	95584	} while (*aliasp == '/');
298			do {
299	jerenkrantz	95503	++urip;
300	brianp	95584	} while (*urip == '/');
301	jerenkrantz	95503	}
302			else {
303			/* Other characters are compared literally */
304			if (urip++ != aliasp++)
305			return 0;
306			}
307	fielding	83751	}
308
309			/* Check last alias path component matched all the way */
310
311			if (aliasp[-1] != '/' && urip != '\0' && urip != '/')
312	jerenkrantz	95503	return 0;
313	fielding	83751
314			/* Return number of characters from URI which matched (may be
315			* greater than length of alias, since we may have matched
316			* doubled slashes)
317			*/
318
319			return urip - uri;
320			}
321
322	jerenkrantz	95503	static char try_alias_list(request_rec r, apr_array_header_t *aliases,
323			int doesc, int *status)
324	fielding	83751	{
325			alias_entry entries = (alias_entry ) aliases->elts;
326	jorton	153384	ap_regmatch_t regm[AP_MAX_REG_MATCH];
327	fielding	83751	char *found = NULL;
328			int i;
329
330			for (i = 0; i < aliases->nelts; ++i) {
331	jerenkrantz	95503	alias_entry *p = &entries[i];
332			int l;
333	fielding	83751
334	jerenkrantz	95503	if (p->regexp) {
335	striker	101556	if (!ap_regexec(p->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
336	jerenkrantz	95503	if (p->real) {
337			found = ap_pregsub(r->pool, p->real, r->uri,
338	striker	101556	AP_MAX_REG_MATCH, regm);
339	jerenkrantz	95503	if (found && doesc) {
340	dougm	90361	apr_uri_t uri;
341			apr_uri_parse(r->pool, found, &uri);
342	jerenkrantz	91672	/* Do not escape the query string or fragment. */
343	jim	332306	found = apr_uri_unparse(r->pool, &uri,
344	jerenkrantz	91672	APR_URI_UNP_OMITQUERY);
345			found = ap_escape_uri(r->pool, found);
346	rbb	89041	if (uri.query) {
347	jim	332306	found = apr_pstrcat(r->pool, found, "?",
348	jerenkrantz	91672	uri.query, NULL);
349	rbb	89041	}
350	jerenkrantz	91672	if (uri.fragment) {
351	jim	332306	found = apr_pstrcat(r->pool, found, "#",
352	jerenkrantz	91672	uri.fragment, NULL);
353	rbb	89041	}
354	jerenkrantz	95503	}
355			}
356			else {
357			/* need something non-null */
358			found = apr_pstrdup(r->pool, "");
359			}
360			}
361			}
362			else {
363			l = alias_matches(r->uri, p->fake);
364	fielding	83751
365	jerenkrantz	95503	if (l > 0) {
366			if (doesc) {
367			char *escurl;
368			escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
369	fielding	83751
370	jerenkrantz	95503	found = apr_pstrcat(r->pool, p->real, escurl, NULL);
371			}
372			else
373			found = apr_pstrcat(r->pool, p->real, r->uri + l, NULL);
374			}
375			}
376	fielding	83751
377	jerenkrantz	95503	if (found) {
378			if (p->handler) { /* Set handler, and leave a note for mod_cgi */
379			r->handler = p->handler;
380			apr_table_setn(r->notes, "alias-forced-type", r->handler);
381			}
382	wrowe	90562	/* XXX This is as SLOW as can be, next step, we optimize
383			* and merge to whatever part of the found path was already
384			* canonicalized. After I finish eliminating os canonical.
385	wrowe	93965	* Better fail test for ap_server_root_relative needed here.
386	wrowe	90562	*/
387	wrowe	93965	if (!doesc) {
388	wrowe	90562	found = ap_server_root_relative(r->pool, found);
389	wrowe	93965	}
390			if (found) {
391	jerenkrantz	95503	*status = p->redir_status;
392	wrowe	93965	}
393	jerenkrantz	95503	return found;
394			}
395	fielding	83751
396			}
397
398			return NULL;
399			}
400
401			static int translate_alias_redir(request_rec *r)
402			{
403	gstein	88225	ap_conf_vector_t *sconf = r->server->module_config;
404			alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
405	fielding	83751	char *ret;
406			int status;
407
408	jerenkrantz	95503	if (r->uri[0] != '/' && r->uri[0] != '\0') {
409			return DECLINED;
410			}
411	fielding	83751
412			if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
413	jerenkrantz	95503	if (ap_is_HTTP_REDIRECT(status)) {
414			/* include QUERY_STRING if any */
415			if (r->args) {
416			ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
417			}
418			apr_table_setn(r->headers_out, "Location", ret);
419			}
420			return status;
421	fielding	83751	}
422
423			if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
424	jerenkrantz	95503	r->filename = ret;
425			return OK;
426	fielding	83751	}
427
428			return DECLINED;
429			}
430
431			static int fixup_redir(request_rec *r)
432			{
433			void *dconf = r->per_dir_config;
434			alias_dir_conf *dirconf =
435			(alias_dir_conf *) ap_get_module_config(dconf, &alias_module);
436			char *ret;
437			int status;
438
439			/* It may have changed since last time, so try again */
440
441			if ((ret = try_alias_list(r, dirconf->redirects, 1, &status)) != NULL) {
442	coar	93137	if (ap_is_HTTP_REDIRECT(status)) {
443	coar	93143	if (ret[0] == '/') {
444			char *orig_target = ret;
445
446			ret = ap_construct_url(r->pool, ret, r);
447	trawick	95150	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
448	coar	93143	"incomplete redirection target of '%s' for "
449			"URI '%s' modified to '%s'",
450			orig_target, r->uri, ret);
451			}
452	coar	93137	if (!ap_is_url(ret)) {
453			status = HTTP_INTERNAL_SERVER_ERROR;
454	trawick	95150	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
455	coar	93137	"cannot redirect '%s' to '%s'; "
456	coar	93143	"target is not a valid absoluteURI or abs_path",
457	coar	93137	r->uri, ret);
458			}
459			else {
460	nd	98796	/* append requested query only, if the config didn't
461			* supply its own.
462			*/
463			if (r->args && !ap_strchr(ret, '?')) {
464			ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
465			}
466	coar	93137	apr_table_setn(r->headers_out, "Location", ret);
467			}
468			}
469	jerenkrantz	95503	return status;
470	fielding	83751	}
471
472			return DECLINED;
473			}
474
475	wrowe	87697	static void register_hooks(apr_pool_t *p)
476	fielding	83770	{
477	slive	96137	static const char * const aszSucc[]={ "mod_userdir.c",
478			"mod_vhost_alias.c",NULL };
479	fielding	83770
480	slive	94985	ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE);
481	wrowe	87731	ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE);
482	fielding	83770	}
483
484	wrowe	86609	module AP_MODULE_DECLARE_DATA alias_module =
485	fielding	83751	{
486	fielding	83770	STANDARD20_MODULE_STUFF,
487	jerenkrantz	95503	create_alias_dir_config, /* dir config creater */
488			merge_alias_dir_config, /* dir merger --- default is to override */
489			create_alias_config, /* server config */
490			merge_alias_config, /* merge server configs */
491			alias_cmds, /* command apr_table_t */
492			register_hooks /* register hooks */
493	fielding	83751	};