chiark / gitweb /
DisOrder 3.0
[disorder] / lib / url.c
CommitLineData
36bde473 1/*
2 * This file is part of DisOrder
5aff007d 3 * Copyright (C) 2007, 2008 Richard Kettlewell
36bde473 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20/** @file lib/url.c
21 * @brief URL support functions
22 */
23
24#include <config.h>
25#include "types.h"
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <errno.h>
0688055d 30#include <string.h>
36bde473 31
32#include "mem.h"
33#include "log.h"
34#include "printf.h"
35#include "url.h"
36#include "kvp.h"
37
38/** @brief Infer the for the web interface
39 * @return Inferred URL
40 *
41 * See <a href="http://tools.ietf.org/html/rfc3875">RFC 3875</a>.
42 */
43char *infer_url(void) {
0688055d 44 const char *scheme = "http", *server, *script, *e, *request_uri;
36bde473 45 char *url;
46 int port;
47
48 /* Figure out the server. 'MUST' be set and we don't cope if it
49 * is not. */
50 if(!(server = getenv("SERVER_NAME")))
51 fatal(0, "SERVER_NAME is not set");
52 server = xstrdup(server);
53
54 /* Figure out the port. 'MUST' be set but we cope if it is not. */
55 if((e = getenv("SERVER_PORT")))
56 port = atoi(e);
57 else
58 port = 80;
59
0688055d 60 /* Figure out path to ourselves. */
61 if((request_uri = getenv("REQUEST_URI"))) {
62 /* REQUEST_URI is an Apache extexnsion. If it's available it results in
63 * more accurate self-referencing URLs. */
64 if((e = strchr(request_uri, '?')))
65 script = xstrndup(request_uri, e - request_uri);
66 else
67 script = xstrdup(request_uri);
68 } else {
69 /* RFC3875 s4.1.13 */
70 if(!(script = getenv("SCRIPT_NAME")))
71 fatal(0, "SCRIPT_NAME is not set");
72 /* SCRIPT_NAME may be "" */
73 if(!*script)
74 script = "/";
75 /* SCRIPT_NAME is not URL-encoded */
76 script = urlencodestring(script);
77 }
36bde473 78 if(script[0] != '/')
79 fatal(0, "SCRIPT_NAME does not start with a '/'");
80 script = xstrdup(script);
81
82 if(port == 80)
83 byte_xasprintf(&url, "%s://%s%s",
84 scheme, server, script);
85 else
86 byte_xasprintf(&url, "%s://%s:%d%s",
87 scheme, server, port, script);
88 return url;
89}
90
91/** @brief Parse a URL
92 * @param url URL to parsed
93 * @param parsed Where to store parsed URL data
94 * @return 0 on success, non-0 on error
95 *
96 * NB that URLs with usernames and passwords are NOT currently supported.
97 */
98int parse_url(const char *url, struct url *parsed) {
99 const char *s;
100 long n;
101
102 /* The scheme */
103 for(s = url; *s && *s != '/' && *s != ':'; ++s)
104 ;
105 if(*s == ':') {
106 parsed->scheme = xstrndup(url, s - url);
107 url = s + 1;
108 } else
109 parsed->scheme = 0;
110
111 /* The host and port */
112 if(*url == '/' && url[1] == '/') {
113 /* //user:password@host:port, but we don't support the
114 * user:password@ part. */
115 url += 2;
116 for(s = url; *s && *s != '/' && *s != ':'; ++s)
117 ;
118 parsed->host = xstrndup(url, s - url);
119 if(*s == ':') {
120 /* We have host:port[/...] */
121 ++s;
122 errno = 0;
123 n = strtol(s, (char **)&url, 10);
124 if(errno)
125 return -1;
126 if(n < 0 || n > 65535)
127 return -1;
128 parsed->port = n;
129 } else {
130 /* We just have host[/...] */
131 url = s;
132 parsed->port = -1;
133 }
134 }
135
136 /* The path */
137 for(s = url; *s && *s != '?'; ++s)
138 ;
139 if(!(parsed->path = urldecodestring(url, s - url)))
140 return -1;
141 url = s;
142
143 /* The query */
144 if(*url == '?')
145 parsed->query = xstrdup(url + 1);
146 else
147 parsed->query = 0;
148
149 return 0;
150}
151
152/*
153Local Variables:
154c-basic-offset:2
155comment-column:40
156fill-column:79
157indent-tabs-mode:nil
158End:
159*/