modules/mappers/mod_alias.c

/* Copyright 1999-2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * http_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;
    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, 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;
    regex_t *r = NULL;
    const char *f = arg2;
    const char *url = arg3;

    if (!strcasecmp(arg1, "gone"))
        status = HTTP_GONE;
    else 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 {
        f = arg1;
        url = arg2;
    }

    if (use_regex) {
        r = ap_pregcomp(cmd->pool, f, 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";
        if (!use_regex && !ap_is_url(url))
            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;
    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	/* Copyright 1999-2004 The Apache Software Foundation
2	*
3	* Licensed under the Apache License, Version 2.0 (the "License");
4	* you may not use this file except in compliance with the License.
5	* You may obtain a copy of the License at
6	*
7	* http://www.apache.org/licenses/LICENSE-2.0
8	*
9	* Unless required by applicable law or agreed to in writing, software
10	* distributed under the License is distributed on an "AS IS" BASIS,
11	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12	* See the License for the specific language governing permissions and
13	* limitations under the License.
14	*/
15
16	/*
17	* http_alias.c: Stuff for dealing with directory aliases
18	*
19	* Original by Rob McCool, rewritten in succession by David Robinson
20	* and rst.
21	*
22	*/
23
24	#include "apr_strings.h"
25	#include "apr_lib.h"
26
27	#define APR_WANT_STRFUNC
28	#include "apr_want.h"
29
30	#include "ap_config.h"
31	#include "httpd.h"
32	#include "http_core.h"
33	#include "http_config.h"
34	#include "http_request.h"
35	#include "http_log.h"
36
37
38	typedef struct {
39	const char *real;
40	const char *fake;
41	char *handler;
42	regex_t *regexp;
43	int redir_status; /* 301, 302, 303, 410, etc */
44	} alias_entry;
45
46	typedef struct {
47	apr_array_header_t *aliases;
48	apr_array_header_t *redirects;
49	} alias_server_conf;
50
51	typedef struct {
52	apr_array_header_t *redirects;
53	} alias_dir_conf;
54
55	module AP_MODULE_DECLARE_DATA alias_module;
56
57	static void create_alias_config(apr_pool_t p, server_rec *s)
58	{
59	alias_server_conf *a =
60	(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
61
62	a->aliases = apr_array_make(p, 20, sizeof(alias_entry));
63	a->redirects = apr_array_make(p, 20, sizeof(alias_entry));
64	return a;
65	}
66
67	static void create_alias_dir_config(apr_pool_t p, char *d)
68	{
69	alias_dir_conf *a =
70	(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
71	a->redirects = apr_array_make(p, 2, sizeof(alias_entry));
72	return a;
73	}
74
75	static void merge_alias_config(apr_pool_t p, void basev, void overridesv)
76	{
77	alias_server_conf *a =
78	(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
79	alias_server_conf base = (alias_server_conf ) basev;
80	alias_server_conf overrides = (alias_server_conf ) overridesv;
81
82	a->aliases = apr_array_append(p, overrides->aliases, base->aliases);
83	a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
84	return a;
85	}
86
87	static void merge_alias_dir_config(apr_pool_t p, void basev, void overridesv)
88	{
89	alias_dir_conf *a =
90	(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
91	alias_dir_conf base = (alias_dir_conf ) basev;
92	alias_dir_conf overrides = (alias_dir_conf ) overridesv;
93	a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
94	return a;
95	}
96
97	/* need prototype for overlap check */
98	static int alias_matches(const char uri, const char alias_fakename);
99
100	static const char add_alias_internal(cmd_parms cmd, void *dummy,
101	const char f, const char r,
102	int use_regex)
103	{
104	server_rec *s = cmd->server;
105	alias_server_conf *conf = ap_get_module_config(s->module_config,
106	&alias_module);
107	alias_entry *new = apr_array_push(conf->aliases);
108	alias_entry entries = (alias_entry )conf->aliases->elts;
109	int i;
110
111	/* XX r can NOT be relative to DocumentRoot here... compat bug. */
112
113	if (use_regex) {
114	new->regexp = ap_pregcomp(cmd->pool, f, REG_EXTENDED);
115	if (new->regexp == NULL)
116	return "Regular expression could not be compiled.";
117	new->real = r;
118	}
119	else {
120	/* XXX This may be optimized, but we must know that new->real
121	* exists. If so, we can dir merge later, trusing new->real
122	* and just canonicalizing the remainder. Not till I finish
123	* cleaning out the old ap_canonical stuff first.
124	*/
125	new->real = r;
126	}
127	new->fake = f;
128	new->handler = cmd->info;
129
130	/* check for overlapping (Script)Alias directives
131	* and throw a warning if found one
132	*/
133	if (!use_regex) {
134	for (i = 0; i < conf->aliases->nelts - 1; ++i) {
135	alias_entry *p = &entries[i];
136
137	if ( (!p->regexp && alias_matches(f, p->fake) > 0)
138	\|\| (p->regexp && !ap_regexec(p->regexp, f, 0, NULL, 0))) {
139	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
140	"The %s directive in %s at line %d will probably "
141	"never match because it overlaps an earlier "
142	"%sAlias%s.",
143	cmd->cmd->name, cmd->directive->filename,
144	cmd->directive->line_num,
145	p->handler ? "Script" : "",
146	p->regexp ? "Match" : "");
147
148	break; /* one warning per alias should be sufficient */
149	}
150	}
151	}
152
153	return NULL;
154	}
155
156	static const char add_alias(cmd_parms cmd, void dummy, const char f,
157	const char *r)
158	{
159	return add_alias_internal(cmd, dummy, f, r, 0);
160	}
161
162	static const char add_alias_regex(cmd_parms cmd, void dummy, const char f,
163	const char *r)
164	{
165	return add_alias_internal(cmd, dummy, f, r, 1);
166	}
167
168	static const char add_redirect_internal(cmd_parms cmd,
169	alias_dir_conf *dirconf,
170	const char arg1, const char arg2,
171	const char *arg3, int use_regex)
172	{
173	alias_entry *new;
174	server_rec *s = cmd->server;
175	alias_server_conf *serverconf = ap_get_module_config(s->module_config,
176	&alias_module);
177	int status = (int) (long) cmd->info;
178	regex_t *r = NULL;
179	const char *f = arg2;
180	const char *url = arg3;
181
182	if (!strcasecmp(arg1, "gone"))
183	status = HTTP_GONE;
184	else if (!strcasecmp(arg1, "permanent"))
185	status = HTTP_MOVED_PERMANENTLY;
186	else if (!strcasecmp(arg1, "temp"))
187	status = HTTP_MOVED_TEMPORARILY;
188	else if (!strcasecmp(arg1, "seeother"))
189	status = HTTP_SEE_OTHER;
190	else if (apr_isdigit(*arg1))
191	status = atoi(arg1);
192	else {
193	f = arg1;
194	url = arg2;
195	}
196
197	if (use_regex) {
198	r = ap_pregcomp(cmd->pool, f, REG_EXTENDED);
199	if (r == NULL)
200	return "Regular expression could not be compiled.";
201	}
202
203	if (ap_is_HTTP_REDIRECT(status)) {
204	if (!url)
205	return "URL to redirect to is missing";
206	if (!use_regex && !ap_is_url(url))
207	return "Redirect to non-URL";
208	}
209	else {
210	if (url)
211	return "Redirect URL not valid for this status";
212	}
213
214	if (cmd->path)
215	new = apr_array_push(dirconf->redirects);
216	else
217	new = apr_array_push(serverconf->redirects);
218
219	new->fake = f;
220	new->real = url;
221	new->regexp = r;
222	new->redir_status = status;
223	return NULL;
224	}
225
226	static const char add_redirect(cmd_parms cmd, void *dirconf,
227	const char arg1, const char arg2,
228	const char *arg3)
229	{
230	return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
231	}
232
233	static const char add_redirect2(cmd_parms cmd, void *dirconf,
234	const char arg1, const char arg2)
235	{
236	return add_redirect_internal(cmd, dirconf, arg1, arg2, NULL, 0);
237	}
238
239	static const char add_redirect_regex(cmd_parms cmd, void *dirconf,
240	const char arg1, const char arg2,
241	const char *arg3)
242	{
243	return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
244	}
245
246	static const command_rec alias_cmds[] =
247	{
248	AP_INIT_TAKE2("Alias", add_alias, NULL, RSRC_CONF,
249	"a fakename and a realname"),
250	AP_INIT_TAKE2("ScriptAlias", add_alias, "cgi-script", RSRC_CONF,
251	"a fakename and a realname"),
252	AP_INIT_TAKE23("Redirect", add_redirect, (void *) HTTP_MOVED_TEMPORARILY,
253	OR_FILEINFO,
254	"an optional status, then document to be redirected and "
255	"destination URL"),
256	AP_INIT_TAKE2("AliasMatch", add_alias_regex, NULL, RSRC_CONF,
257	"a regular expression and a filename"),
258	AP_INIT_TAKE2("ScriptAliasMatch", add_alias_regex, "cgi-script", RSRC_CONF,
259	"a regular expression and a filename"),
260	AP_INIT_TAKE23("RedirectMatch", add_redirect_regex,
261	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
262	"an optional status, then a regular expression and "
263	"destination URL"),
264	AP_INIT_TAKE2("RedirectTemp", add_redirect2,
265	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
266	"a document to be redirected, then the destination URL"),
267	AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
268	(void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO,
269	"a document to be redirected, then the destination URL"),
270	{NULL}
271	};
272
273	static int alias_matches(const char uri, const char alias_fakename)
274	{
275	const char aliasp = alias_fakename, urip = uri;
276
277	while (*aliasp) {
278	if (*aliasp == '/') {
279	/* any number of '/' in the alias matches any number in
280	* the supplied URI, but there must be at least one...
281	*/
282	if (*urip != '/')
283	return 0;
284
285	do {
286	++aliasp;
287	} while (*aliasp == '/');
288	do {
289	++urip;
290	} while (*urip == '/');
291	}
292	else {
293	/* Other characters are compared literally */
294	if (urip++ != aliasp++)
295	return 0;
296	}
297	}
298
299	/* Check last alias path component matched all the way */
300
301	if (aliasp[-1] != '/' && urip != '\0' && urip != '/')
302	return 0;
303
304	/* Return number of characters from URI which matched (may be
305	* greater than length of alias, since we may have matched
306	* doubled slashes)
307	*/
308
309	return urip - uri;
310	}
311
312	static char try_alias_list(request_rec r, apr_array_header_t *aliases,
313	int doesc, int *status)
314	{
315	alias_entry entries = (alias_entry ) aliases->elts;
316	regmatch_t regm[AP_MAX_REG_MATCH];
317	char *found = NULL;
318	int i;
319
320	for (i = 0; i < aliases->nelts; ++i) {
321	alias_entry *p = &entries[i];
322	int l;
323
324	if (p->regexp) {
325	if (!ap_regexec(p->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
326	if (p->real) {
327	found = ap_pregsub(r->pool, p->real, r->uri,
328	AP_MAX_REG_MATCH, regm);
329	if (found && doesc) {
330	apr_uri_t uri;
331	apr_uri_parse(r->pool, found, &uri);
332	/* Do not escape the query string or fragment. */
333	found = apr_uri_unparse(r->pool, &uri,
334	APR_URI_UNP_OMITQUERY);
335	found = ap_escape_uri(r->pool, found);
336	if (uri.query) {
337	found = apr_pstrcat(r->pool, found, "?",
338	uri.query, NULL);
339	}
340	if (uri.fragment) {
341	found = apr_pstrcat(r->pool, found, "#",
342	uri.fragment, NULL);
343	}
344	}
345	}
346	else {
347	/* need something non-null */
348	found = apr_pstrdup(r->pool, "");
349	}
350	}
351	}
352	else {
353	l = alias_matches(r->uri, p->fake);
354
355	if (l > 0) {
356	if (doesc) {
357	char *escurl;
358	escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
359
360	found = apr_pstrcat(r->pool, p->real, escurl, NULL);
361	}
362	else
363	found = apr_pstrcat(r->pool, p->real, r->uri + l, NULL);
364	}
365	}
366
367	if (found) {
368	if (p->handler) { /* Set handler, and leave a note for mod_cgi */
369	r->handler = p->handler;
370	apr_table_setn(r->notes, "alias-forced-type", r->handler);
371	}
372	/* XXX This is as SLOW as can be, next step, we optimize
373	* and merge to whatever part of the found path was already
374	* canonicalized. After I finish eliminating os canonical.
375	* Better fail test for ap_server_root_relative needed here.
376	*/
377	if (!doesc) {
378	found = ap_server_root_relative(r->pool, found);
379	}
380	if (found) {
381	*status = p->redir_status;
382	}
383	return found;
384	}
385
386	}
387
388	return NULL;
389	}
390
391	static int translate_alias_redir(request_rec *r)
392	{
393	ap_conf_vector_t *sconf = r->server->module_config;
394	alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
395	char *ret;
396	int status;
397
398	if (r->uri[0] != '/' && r->uri[0] != '\0') {
399	return DECLINED;
400	}
401
402	if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
403	if (ap_is_HTTP_REDIRECT(status)) {
404	/* include QUERY_STRING if any */
405	if (r->args) {
406	ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
407	}
408	apr_table_setn(r->headers_out, "Location", ret);
409	}
410	return status;
411	}
412
413	if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
414	r->filename = ret;
415	return OK;
416	}
417
418	return DECLINED;
419	}
420
421	static int fixup_redir(request_rec *r)
422	{
423	void *dconf = r->per_dir_config;
424	alias_dir_conf *dirconf =
425	(alias_dir_conf *) ap_get_module_config(dconf, &alias_module);
426	char *ret;
427	int status;
428
429	/* It may have changed since last time, so try again */
430
431	if ((ret = try_alias_list(r, dirconf->redirects, 1, &status)) != NULL) {
432	if (ap_is_HTTP_REDIRECT(status)) {
433	if (ret[0] == '/') {
434	char *orig_target = ret;
435
436	ret = ap_construct_url(r->pool, ret, r);
437	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
438	"incomplete redirection target of '%s' for "
439	"URI '%s' modified to '%s'",
440	orig_target, r->uri, ret);
441	}
442	if (!ap_is_url(ret)) {
443	status = HTTP_INTERNAL_SERVER_ERROR;
444	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
445	"cannot redirect '%s' to '%s'; "
446	"target is not a valid absoluteURI or abs_path",
447	r->uri, ret);
448	}
449	else {
450	/* append requested query only, if the config didn't
451	* supply its own.
452	*/
453	if (r->args && !ap_strchr(ret, '?')) {
454	ret = apr_pstrcat(r->pool, ret, "?", r->args, NULL);
455	}
456	apr_table_setn(r->headers_out, "Location", ret);
457	}
458	}
459	return status;
460	}
461
462	return DECLINED;
463	}
464
465	static void register_hooks(apr_pool_t *p)
466	{
467	static const char * const aszSucc[]={ "mod_userdir.c",
468	"mod_vhost_alias.c",NULL };
469
470	ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE);
471	ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE);
472	}
473
474	module AP_MODULE_DECLARE_DATA alias_module =
475	{
476	STANDARD20_MODULE_STUFF,
477	create_alias_dir_config, /* dir config creater */
478	merge_alias_dir_config, /* dir merger --- default is to override */
479	create_alias_config, /* server config */
480	merge_alias_config, /* merge server configs */
481	alias_cmds, /* command apr_table_t */
482	register_hooks /* register hooks */
483	};
Name	Value
cvs2svn:cvs-rev	1.55
svn:eol-style	native
svn:keywords	Author Date Id Revision