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;
    int grokarg1 = 1;
    ap_regex_t *r = NULL;
    const char *f = arg2;
    const char *url = arg3;

    /*
     * Logic flow:
     *   Go ahead and try to grok the 1st arg, in case it is a
     *   Redirect status. Now if we have 3 args, we expect that
     *   we were able to understand that 1st argument (it's something
     *   we expected, so if not, then we bail. We also check that we
     *   don't have a 3rd argument with GONE or with numeric codes
     *   outside of 300-399; if we do, then that's an error.
     */
    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 (!strcasecmp(arg1, "gone"))
        status = HTTP_GONE;
    else if (apr_isdigit(*arg1))
        status = atoi(arg1);
    else
        grokarg1 = 0;

    if (arg3 && !grokarg1)
        return "Redirect: invalid first argument (of three)";

    if (arg3 && status == HTTP_GONE)
        return "Redirect: third argument not expected";
        
    if (arg3 && (apr_isdigit(*arg1) && (status < 300 || status > 399)))
        return "Redirect: third argument not expected";
        
    /*
     * if we don't have the 3rd arg and we didn't understand the 1st
     * one, then assume URL-path URL. This also handles case, eg, GONE
     * we even though we don't have a 3rd arg, we did understand the 1st
     * one, so we don't want to re-arrange
     */
    if (!arg3 && !grokarg1) {
        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	jim	780692	int grokarg1 = 1;
180	jim	780697	ap_regex_t *r = NULL;
181	ben	85644	const char *f = arg2;
182			const char *url = arg3;
183	fielding	83751
184	jim	780692	/*
185			* Logic flow:
186			* Go ahead and try to grok the 1st arg, in case it is a
187			* Redirect status. Now if we have 3 args, we expect that
188			* we were able to understand that 1st argument (it's something
189			* we expected, so if not, then we bail. We also check that we
190			* don't have a 3rd argument with GONE or with numeric codes
191			* outside of 300-399; if we do, then that's an error.
192			*/
193			if (!strcasecmp(arg1, "permanent"))
194			status = HTTP_MOVED_PERMANENTLY;
195			else if (!strcasecmp(arg1, "temp"))
196			status = HTTP_MOVED_TEMPORARILY;
197			else if (!strcasecmp(arg1, "seeother"))
198			status = HTTP_SEE_OTHER;
199			else if (!strcasecmp(arg1, "gone"))
200	jim	780648	status = HTTP_GONE;
201	rpluem	780655	else if (apr_isdigit(*arg1))
202			status = atoi(arg1);
203	jim	780692	else
204			grokarg1 = 0;
205
206			if (arg3 && !grokarg1)
207			return "Redirect: invalid first argument (of three)";
208
209			if (arg3 && status == HTTP_GONE)
210			return "Redirect: third argument not expected";
211
212			if (arg3 && (apr_isdigit(*arg1) && (status < 300 \|\| status > 399)))
213			return "Redirect: third argument not expected";
214
215			/*
216			* if we don't have the 3rd arg and we didn't understand the 1st
217			* one, then assume URL-path URL. This also handles case, eg, GONE
218			* we even though we don't have a 3rd arg, we did understand the 1st
219			* one, so we don't want to re-arrange
220			*/
221			if (!arg3 && !grokarg1) {
222	jerenkrantz	95503	f = arg1;
223			url = arg2;
224	fielding	83751	}
225
226			if (use_regex) {
227	jorton	153384	r = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
228	jerenkrantz	95503	if (r == NULL)
229			return "Regular expression could not be compiled.";
230	fielding	83751	}
231
232			if (ap_is_HTTP_REDIRECT(status)) {
233	jerenkrantz	95503	if (!url)
234			return "URL to redirect to is missing";
235	niq	490142	/* PR#35314: we can allow path components here;
236			* they get correctly resolved to full URLs.
237			*/
238			if (!use_regex && !ap_is_url(url) && (url[0] != '/'))
239	jerenkrantz	95503	return "Redirect to non-URL";
240	fielding	83751	}
241			else {
242	jerenkrantz	95503	if (url)
243			return "Redirect URL not valid for this status";
244	fielding	83751	}
245
246			if (cmd->path)
247	jerenkrantz	95503	new = apr_array_push(dirconf->redirects);
248	fielding	83751	else
249	jerenkrantz	95503	new = apr_array_push(serverconf->redirects);
250	fielding	83751
251			new->fake = f;
252			new->real = url;
253			new->regexp = r;
254			new->redir_status = status;
255			return NULL;
256			}
257
258	ben	85644	static const char add_redirect(cmd_parms cmd, void *dirconf,
259			const char arg1, const char arg2,
260	jerenkrantz	95503	const char *arg3)
261	fielding	83751	{
262			return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
263			}
264
265	ben	85644	static const char add_redirect2(cmd_parms cmd, void *dirconf,
266	jerenkrantz	95503	const char arg1, const char arg2)
267	fielding	83751	{
268	ben	85644	return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0);
269			}
270
271			static const char add_redirect_regex(cmd_parms cmd, void *dirconf,
272	jerenkrantz	95503	const char arg1, const char arg2,
273			const char *arg3)
274	ben	85644	{
275	fielding	83751	return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
276			}
277
278			static const command_rec alias_cmds[] =
279			{
280	trawick	85627	AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF,
281			"a fakename and a realname"),
282			AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF,
283			"a fakename and a realname"),
284			AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
285			OR_FILEINFO,
286			"an optional status, then document to be redirected and "
287			"destination URL"),
288			AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF,
289			"a regular expression and a filename"),
290			AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF,
291			"a regular expression and a filename"),
292	jim	332306	AP_INIT_TAKE23("RedirectMatch", add_redirect_regex,
293	trawick	85627	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
294			"an optional status, then a regular expression and "
295			"destination URL"),
296	ben	85644	AP_INIT_TAKE2("RedirectTemp", add_redirect2,
297	jerenkrantz	95503	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
298	trawick	85627	"a document to be redirected, then the destination URL"),
299	jim	332306	AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
300	trawick	85627	(void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO,
301			"a document to be redirected, then the destination URL"),
302	fielding	83751	{NULL}
303			};
304
305			static int alias_matches(const char uri, const char alias_fakename)
306			{
307			const char aliasp = alias_fakename, urip = uri;
308
309	brianp	92138	while (*aliasp) {
310	jerenkrantz	95503	if (*aliasp == '/') {
311			/* any number of '/' in the alias matches any number in
312			* the supplied URI, but there must be at least one...
313			*/
314			if (*urip != '/')
315			return 0;
316	fielding	83751
317	brianp	95584	do {
318	jerenkrantz	95503	++aliasp;
319	brianp	95584	} while (*aliasp == '/');
320			do {
321	jerenkrantz	95503	++urip;
322	brianp	95584	} while (*urip == '/');
323	jerenkrantz	95503	}
324			else {
325			/* Other characters are compared literally */
326			if (urip++ != aliasp++)
327			return 0;
328			}
329	fielding	83751	}
330
331			/* Check last alias path component matched all the way */
332
333			if (aliasp[-1] != '/' && urip != '\0' && urip != '/')
334	jerenkrantz	95503	return 0;
335	fielding	83751
336			/* Return number of characters from URI which matched (may be
337			* greater than length of alias, since we may have matched
338			* doubled slashes)
339			*/
340
341			return urip - uri;
342			}
343
344	jerenkrantz	95503	static char try_alias_list(request_rec r, apr_array_header_t *aliases,
345			int doesc, int *status)
346	fielding	83751	{
347			alias_entry entries = (alias_entry ) aliases->elts;
348	jorton	153384	ap_regmatch_t regm[AP_MAX_REG_MATCH];
349	fielding	83751	char *found = NULL;
350			int i;
351
352			for (i = 0; i < aliases->nelts; ++i) {
353	jerenkrantz	95503	alias_entry *p = &entries[i];
354			int l;
355	fielding	83751
356	jerenkrantz	95503	if (p->regexp) {
357	striker	101556	if (!ap_regexec(p->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
358	jerenkrantz	95503	if (p->real) {
359			found = ap_pregsub(r->pool, p->real, r->uri,
360	striker	101556	AP_MAX_REG_MATCH, regm);
361	jerenkrantz	95503	if (found && doesc) {
362	dougm	90361	apr_uri_t uri;
363			apr_uri_parse(r->pool, found, &uri);
364	jerenkrantz	91672	/* Do not escape the query string or fragment. */
365	jim	332306	found = apr_uri_unparse(r->pool, &uri,
366	jerenkrantz	91672	APR_URI_UNP_OMITQUERY);
367			found = ap_escape_uri(r->pool, found);
368	rbb	89041	if (uri.query) {
369	jim	332306	found = apr_pstrcat(r->pool, found, "?",
370	jerenkrantz	91672	uri.query, NULL);
371	rbb	89041	}
372	jerenkrantz	91672	if (uri.fragment) {
373	jim	332306	found = apr_pstrcat(r->pool, found, "#",
374	jerenkrantz	91672	uri.fragment, NULL);
375	rbb	89041	}
376	jerenkrantz	95503	}
377			}
378			else {
379			/* need something non-null */
380			found = apr_pstrdup(r->pool, "");
381			}
382			}
383			}
384			else {
385			l = alias_matches(r->uri, p->fake);
386	fielding	83751
387	jerenkrantz	95503	if (l > 0) {
388			if (doesc) {
389			char *escurl;
390			escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
391	fielding	83751
392	jerenkrantz	95503	found = apr_pstrcat(r->pool, p->real, escurl, NULL);
393			}
394			else
395			found = apr_pstrcat(r->pool, p->real, r->uri + l, NULL);
396			}
397			}
398	fielding	83751
399	jerenkrantz	95503	if (found) {
400			if (p->handler) { /* Set handler, and leave a note for mod_cgi */
401			r->handler = p->handler;
402			apr_table_setn(r->notes, "alias-forced-type", r->handler);
403			}
404	wrowe	90562	/* XXX This is as SLOW as can be, next step, we optimize
405			* and merge to whatever part of the found path was already
406			* canonicalized. After I finish eliminating os canonical.
407	wrowe	93965	* Better fail test for ap_server_root_relative needed here.
408	wrowe	90562	*/
409	wrowe	93965	if (!doesc) {
410	wrowe	90562	found = ap_server_root_relative(r->pool, found);
411	wrowe	93965	}
412			if (found) {
413	jerenkrantz	95503	*status = p->redir_status;
414	wrowe	93965	}
415	jerenkrantz	95503	return found;
416			}
417	fielding	83751
418			}
419
420			return NULL;
421			}
422
423			static int translate_alias_redir(request_rec *r)
424			{
425	gstein	88225	ap_conf_vector_t *sconf = r->server->module_config;
426			alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
427	fielding	83751	char *ret;
428			int status;
429
430	jerenkrantz	95503	if (r->uri[0] != '/' && r->uri[0] != '\0') {
431			return DECLINED;
432			}
433	fielding	83751
434			if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
435	jerenkrantz	95503	if (ap_is_HTTP_REDIRECT(status)) {
436			/* include QUERY_STRING if any */
437			if (r->args) {
438			ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
439			}
440			apr_table_setn(r->headers_out, "Location", ret);
441			}
442			return status;
443	fielding	83751	}
444
445			if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
446	jerenkrantz	95503	r->filename = ret;
447			return OK;
448	fielding	83751	}
449
450			return DECLINED;
451			}
452
453			static int fixup_redir(request_rec *r)
454			{
455			void *dconf = r->per_dir_config;
456			alias_dir_conf *dirconf =
457			(alias_dir_conf *) ap_get_module_config(dconf, &alias_module);
458			char *ret;
459			int status;
460
461			/* It may have changed since last time, so try again */
462
463			if ((ret = try_alias_list(r, dirconf->redirects, 1, &status)) != NULL) {
464	coar	93137	if (ap_is_HTTP_REDIRECT(status)) {
465	coar	93143	if (ret[0] == '/') {
466			char *orig_target = ret;
467
468			ret = ap_construct_url(r->pool, ret, r);
469	trawick	95150	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
470	coar	93143	"incomplete redirection target of '%s' for "
471			"URI '%s' modified to '%s'",
472			orig_target, r->uri, ret);
473			}
474	coar	93137	if (!ap_is_url(ret)) {
475			status = HTTP_INTERNAL_SERVER_ERROR;
476	trawick	95150	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
477	coar	93137	"cannot redirect '%s' to '%s'; "
478	coar	93143	"target is not a valid absoluteURI or abs_path",
479	coar	93137	r->uri, ret);
480			}
481			else {
482	nd	98796	/* append requested query only, if the config didn't
483			* supply its own.
484			*/
485			if (r->args && !ap_strchr(ret, '?')) {
486			ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
487			}
488	coar	93137	apr_table_setn(r->headers_out, "Location", ret);
489			}
490			}
491	jerenkrantz	95503	return status;
492	fielding	83751	}
493
494			return DECLINED;
495			}
496
497	wrowe	87697	static void register_hooks(apr_pool_t *p)
498	fielding	83770	{
499	slive	96137	static const char * const aszSucc[]={ "mod_userdir.c",
500			"mod_vhost_alias.c",NULL };
501	fielding	83770
502	slive	94985	ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE);
503	wrowe	87731	ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE);
504	fielding	83770	}
505
506	wrowe	86609	module AP_MODULE_DECLARE_DATA alias_module =
507	fielding	83751	{
508	fielding	83770	STANDARD20_MODULE_STUFF,
509	jerenkrantz	95503	create_alias_dir_config, /* dir config creater */
510			merge_alias_dir_config, /* dir merger --- default is to override */
511			create_alias_config, /* server config */
512			merge_alias_config, /* merge server configs */
513			alias_cmds, /* command apr_table_t */
514			register_hooks /* register hooks */
515	fielding	83751	};