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1 | /* |
2 | * This file is part of DisOrder |
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3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
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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> |
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30 | #include <string.h> |
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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 | */ |
43 | char *infer_url(void) { |
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44 | const char *scheme = "http", *server, *script, *e, *request_uri; |
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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 | |
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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 | } |
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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 | */ |
98 | int 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 | /* |
153 | Local Variables: |
154 | c-basic-offset:2 |
155 | comment-column:40 |
156 | fill-column:79 |
157 | indent-tabs-mode:nil |
158 | End: |
159 | */ |