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	nd	102618	/* Copyright 1999-2004 The Apache Software Foundation
2	fielding	83751	*
3	nd	102525	* 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	fielding	84879	*
7	nd	102525	* http://www.apache.org/licenses/LICENSE-2.0
8	fielding	83751	*
9	nd	102525	* 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	fielding	83751	*/
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	rbb	85867	#include "apr_strings.h"
25	gstein	88060	#include "apr_lib.h"
26
27			#define APR_WANT_STRFUNC
28			#include "apr_want.h"
29
30	rbb	84531	#include "ap_config.h"
31	fielding	83751	#include "httpd.h"
32	coar	93143	#include "http_core.h"
33	fielding	83751	#include "http_config.h"
34	fielding	83770	#include "http_request.h"
35	coar	93137	#include "http_log.h"
36	fielding	83751
37	gstein	88060
38	fielding	83751	typedef struct {
39	ben	85644	const char *real;
40			const char *fake;
41	fielding	83751	char *handler;
42			regex_t *regexp;
43	jerenkrantz	95503	int redir_status; /* 301, 302, 303, 410, etc */
44	fielding	83751	} alias_entry;
45
46			typedef struct {
47	dougm	85976	apr_array_header_t *aliases;
48			apr_array_header_t *redirects;
49	fielding	83751	} alias_server_conf;
50
51			typedef struct {
52	dougm	85976	apr_array_header_t *redirects;
53	fielding	83751	} alias_dir_conf;
54
55	wrowe	86609	module AP_MODULE_DECLARE_DATA alias_module;
56	fielding	83751
57	dougm	85976	static void create_alias_config(apr_pool_t p, server_rec *s)
58	fielding	83751	{
59			alias_server_conf *a =
60	dougm	85976	(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
61	fielding	83751
62	dougm	88019	a->aliases = apr_array_make(p, 20, sizeof(alias_entry));
63			a->redirects = apr_array_make(p, 20, sizeof(alias_entry));
64	fielding	83751	return a;
65			}
66
67	dougm	85976	static void create_alias_dir_config(apr_pool_t p, char *d)
68	fielding	83751	{
69			alias_dir_conf *a =
70	dougm	85976	(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
71	dougm	88019	a->redirects = apr_array_make(p, 2, sizeof(alias_entry));
72	fielding	83751	return a;
73			}
74
75	dougm	85976	static void merge_alias_config(apr_pool_t p, void basev, void overridesv)
76	fielding	83751	{
77			alias_server_conf *a =
78	dougm	85976	(alias_server_conf *) apr_pcalloc(p, sizeof(alias_server_conf));
79	jerenkrantz	95503	alias_server_conf base = (alias_server_conf ) basev;
80			alias_server_conf overrides = (alias_server_conf ) overridesv;
81	fielding	83751
82	dougm	88019	a->aliases = apr_array_append(p, overrides->aliases, base->aliases);
83			a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
84	fielding	83751	return a;
85			}
86
87	dougm	85976	static void merge_alias_dir_config(apr_pool_t p, void basev, void overridesv)
88	fielding	83751	{
89			alias_dir_conf *a =
90	dougm	85976	(alias_dir_conf *) apr_pcalloc(p, sizeof(alias_dir_conf));
91	jerenkrantz	95503	alias_dir_conf base = (alias_dir_conf ) basev;
92			alias_dir_conf overrides = (alias_dir_conf ) overridesv;
93	dougm	88019	a->redirects = apr_array_append(p, overrides->redirects, base->redirects);
94	fielding	83751	return a;
95			}
96
97	nd	98647	/* need prototype for overlap check */
98			static int alias_matches(const char uri, const char alias_fakename);
99
100	ben	85644	static const char add_alias_internal(cmd_parms cmd, void *dummy,
101	jerenkrantz	95503	const char f, const char r,
102			int use_regex)
103	fielding	83751	{
104			server_rec *s = cmd->server;
105	gstein	88225	alias_server_conf *conf = ap_get_module_config(s->module_config,
106			&alias_module);
107	dougm	88019	alias_entry *new = apr_array_push(conf->aliases);
108	nd	98647	alias_entry entries = (alias_entry )conf->aliases->elts;
109			int i;
110	fielding	83751
111			/* XX r can NOT be relative to DocumentRoot here... compat bug. */
112
113			if (use_regex) {
114	jerenkrantz	95503	new->regexp = ap_pregcomp(cmd->pool, f, REG_EXTENDED);
115			if (new->regexp == NULL)
116			return "Regular expression could not be compiled.";
117	rbb	88010	new->real = r;
118	fielding	83751	}
119	wrowe	90562	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	fielding	83751	new->fake = f;
128			new->handler = cmd->info;
129
130	nd	98647	/* 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	trawick	98741	if ( (!p->regexp && alias_matches(f, p->fake) > 0)
138			\|\| (p->regexp && !ap_regexec(p->regexp, f, 0, NULL, 0))) {
139	nd	98647	ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
140	nd	102949	"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	nd	98657	p->handler ? "Script" : "",
146			p->regexp ? "Match" : "");
147	nd	98647
148			break; /* one warning per alias should be sufficient */
149			}
150			}
151			}
152
153	fielding	83751	return NULL;
154			}
155
156	ben	85644	static const char add_alias(cmd_parms cmd, void dummy, const char f,
157	jerenkrantz	95503	const char *r)
158	fielding	83751	{
159			return add_alias_internal(cmd, dummy, f, r, 0);
160			}
161
162	ben	85644	static const char add_alias_regex(cmd_parms cmd, void dummy, const char f,
163	jerenkrantz	95503	const char *r)
164	fielding	83751	{
165			return add_alias_internal(cmd, dummy, f, r, 1);
166			}
167
168	ben	85644	static const char add_redirect_internal(cmd_parms cmd,
169	jerenkrantz	95503	alias_dir_conf *dirconf,
170			const char arg1, const char arg2,
171	trawick	85627	const char *arg3, int use_regex)
172	fielding	83751	{
173			alias_entry *new;
174			server_rec *s = cmd->server;
175	gstein	88225	alias_server_conf *serverconf = ap_get_module_config(s->module_config,
176			&alias_module);
177	fielding	83751	int status = (int) (long) cmd->info;
178			regex_t *r = NULL;
179	ben	85644	const char *f = arg2;
180			const char *url = arg3;
181	fielding	83751
182			if (!strcasecmp(arg1, "gone"))
183	jerenkrantz	95503	status = HTTP_GONE;
184	fielding	83751	else if (!strcasecmp(arg1, "permanent"))
185	jerenkrantz	95503	status = HTTP_MOVED_PERMANENTLY;
186	fielding	83751	else if (!strcasecmp(arg1, "temp"))
187	jerenkrantz	95503	status = HTTP_MOVED_TEMPORARILY;
188	fielding	83751	else if (!strcasecmp(arg1, "seeother"))
189	jerenkrantz	95503	status = HTTP_SEE_OTHER;
190	wrowe	86008	else if (apr_isdigit(*arg1))
191	jerenkrantz	95503	status = atoi(arg1);
192	fielding	83751	else {
193	jerenkrantz	95503	f = arg1;
194			url = arg2;
195	fielding	83751	}
196
197			if (use_regex) {
198	jerenkrantz	95503	r = ap_pregcomp(cmd->pool, f, REG_EXTENDED);
199			if (r == NULL)
200			return "Regular expression could not be compiled.";
201	fielding	83751	}
202
203			if (ap_is_HTTP_REDIRECT(status)) {
204	jerenkrantz	95503	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	fielding	83751	}
209			else {
210	jerenkrantz	95503	if (url)
211			return "Redirect URL not valid for this status";
212	fielding	83751	}
213
214			if (cmd->path)
215	jerenkrantz	95503	new = apr_array_push(dirconf->redirects);
216	fielding	83751	else
217	jerenkrantz	95503	new = apr_array_push(serverconf->redirects);
218	fielding	83751
219			new->fake = f;
220			new->real = url;
221			new->regexp = r;
222			new->redir_status = status;
223			return NULL;
224			}
225
226	ben	85644	static const char add_redirect(cmd_parms cmd, void *dirconf,
227			const char arg1, const char arg2,
228	jerenkrantz	95503	const char *arg3)
229	fielding	83751	{
230			return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 0);
231			}
232
233	ben	85644	static const char add_redirect2(cmd_parms cmd, void *dirconf,
234	jerenkrantz	95503	const char arg1, const char arg2)
235	fielding	83751	{
236	ben	85644	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	jerenkrantz	95503	const char arg1, const char arg2,
241			const char *arg3)
242	ben	85644	{
243	fielding	83751	return add_redirect_internal(cmd, dirconf, arg1, arg2, arg3, 1);
244			}
245
246			static const command_rec alias_cmds[] =
247			{
248	trawick	85627	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	ben	85644	AP_INIT_TAKE2("RedirectTemp", add_redirect2,
265	jerenkrantz	95503	(void *) HTTP_MOVED_TEMPORARILY, OR_FILEINFO,
266	trawick	85627	"a document to be redirected, then the destination URL"),
267	ben	85644	AP_INIT_TAKE2("RedirectPermanent", add_redirect2,
268	trawick	85627	(void *) HTTP_MOVED_PERMANENTLY, OR_FILEINFO,
269			"a document to be redirected, then the destination URL"),
270	fielding	83751	{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	brianp	92138	while (*aliasp) {
278	jerenkrantz	95503	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	fielding	83751
285	brianp	95584	do {
286	jerenkrantz	95503	++aliasp;
287	brianp	95584	} while (*aliasp == '/');
288			do {
289	jerenkrantz	95503	++urip;
290	brianp	95584	} while (*urip == '/');
291	jerenkrantz	95503	}
292			else {
293			/* Other characters are compared literally */
294			if (urip++ != aliasp++)
295			return 0;
296			}
297	fielding	83751	}
298
299			/* Check last alias path component matched all the way */
300
301			if (aliasp[-1] != '/' && urip != '\0' && urip != '/')
302	jerenkrantz	95503	return 0;
303	fielding	83751
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	jerenkrantz	95503	static char try_alias_list(request_rec r, apr_array_header_t *aliases,
313			int doesc, int *status)
314	fielding	83751	{
315			alias_entry entries = (alias_entry ) aliases->elts;
316	striker	101556	regmatch_t regm[AP_MAX_REG_MATCH];
317	fielding	83751	char *found = NULL;
318			int i;
319
320			for (i = 0; i < aliases->nelts; ++i) {
321	jerenkrantz	95503	alias_entry *p = &entries[i];
322			int l;
323	fielding	83751
324	jerenkrantz	95503	if (p->regexp) {
325	striker	101556	if (!ap_regexec(p->regexp, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
326	jerenkrantz	95503	if (p->real) {
327			found = ap_pregsub(r->pool, p->real, r->uri,
328	striker	101556	AP_MAX_REG_MATCH, regm);
329	jerenkrantz	95503	if (found && doesc) {
330	dougm	90361	apr_uri_t uri;
331			apr_uri_parse(r->pool, found, &uri);
332	jerenkrantz	91672	/* 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	rbb	89041	if (uri.query) {
337	jerenkrantz	91672	found = apr_pstrcat(r->pool, found, "?",
338			uri.query, NULL);
339	rbb	89041	}
340	jerenkrantz	91672	if (uri.fragment) {
341			found = apr_pstrcat(r->pool, found, "#",
342			uri.fragment, NULL);
343	rbb	89041	}
344	jerenkrantz	95503	}
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	fielding	83751
355	jerenkrantz	95503	if (l > 0) {
356			if (doesc) {
357			char *escurl;
358			escurl = ap_os_escape_path(r->pool, r->uri + l, 1);
359	fielding	83751
360	jerenkrantz	95503	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	fielding	83751
367	jerenkrantz	95503	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	wrowe	90562	/* 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	wrowe	93965	* Better fail test for ap_server_root_relative needed here.
376	wrowe	90562	*/
377	wrowe	93965	if (!doesc) {
378	wrowe	90562	found = ap_server_root_relative(r->pool, found);
379	wrowe	93965	}
380			if (found) {
381	jerenkrantz	95503	*status = p->redir_status;
382	wrowe	93965	}
383	jerenkrantz	95503	return found;
384			}
385	fielding	83751
386			}
387
388			return NULL;
389			}
390
391			static int translate_alias_redir(request_rec *r)
392			{
393	gstein	88225	ap_conf_vector_t *sconf = r->server->module_config;
394			alias_server_conf *serverconf = ap_get_module_config(sconf, &alias_module);
395	fielding	83751	char *ret;
396			int status;
397
398	jerenkrantz	95503	if (r->uri[0] != '/' && r->uri[0] != '\0') {
399			return DECLINED;
400			}
401	fielding	83751
402			if ((ret = try_alias_list(r, serverconf->redirects, 1, &status)) != NULL) {
403	jerenkrantz	95503	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	fielding	83751	}
412
413			if ((ret = try_alias_list(r, serverconf->aliases, 0, &status)) != NULL) {
414	jerenkrantz	95503	r->filename = ret;
415			return OK;
416	fielding	83751	}
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	coar	93137	if (ap_is_HTTP_REDIRECT(status)) {
433	coar	93143	if (ret[0] == '/') {
434			char *orig_target = ret;
435
436			ret = ap_construct_url(r->pool, ret, r);
437	trawick	95150	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
438	coar	93143	"incomplete redirection target of '%s' for "
439			"URI '%s' modified to '%s'",
440			orig_target, r->uri, ret);
441			}
442	coar	93137	if (!ap_is_url(ret)) {
443			status = HTTP_INTERNAL_SERVER_ERROR;
444	trawick	95150	ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
445	coar	93137	"cannot redirect '%s' to '%s'; "
446	coar	93143	"target is not a valid absoluteURI or abs_path",
447	coar	93137	r->uri, ret);
448			}
449			else {
450	nd	98796	/* 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	coar	93137	apr_table_setn(r->headers_out, "Location", ret);
457			}
458			}
459	jerenkrantz	95503	return status;
460	fielding	83751	}
461
462			return DECLINED;
463			}
464
465	wrowe	87697	static void register_hooks(apr_pool_t *p)
466	fielding	83770	{
467	slive	96137	static const char * const aszSucc[]={ "mod_userdir.c",
468			"mod_vhost_alias.c",NULL };
469	fielding	83770
470	slive	94985	ap_hook_translate_name(translate_alias_redir,NULL,aszSucc,APR_HOOK_MIDDLE);
471	wrowe	87731	ap_hook_fixups(fixup_redir,NULL,NULL,APR_HOOK_MIDDLE);
472	fielding	83770	}
473
474	wrowe	86609	module AP_MODULE_DECLARE_DATA alias_module =
475	fielding	83751	{
476	fielding	83770	STANDARD20_MODULE_STUFF,
477	jerenkrantz	95503	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	fielding	83751	};
Name	Value
cvs2svn:cvs-rev	1.55
svn:eol-style	native
svn:keywords	Author Date Id Revision