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1 | /* |
2 | * URL utility functions | |
3 | * Copyright (c) 2000, 2001, 2002 Fabrice Bellard | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | ||
23 | #include "avformat.h" | |
24 | #include "config.h" | |
25 | #include "url.h" | |
26 | #if CONFIG_NETWORK | |
27 | #include "network.h" | |
28 | #endif | |
29 | #include "libavutil/avstring.h" | |
30 | ||
31 | /** | |
32 | * @file | |
33 | * URL utility functions. | |
34 | */ | |
35 | ||
36 | int ff_url_join(char *str, int size, const char *proto, | |
37 | const char *authorization, const char *hostname, | |
38 | int port, const char *fmt, ...) | |
39 | { | |
40 | #if CONFIG_NETWORK | |
41 | struct addrinfo hints = { 0 }, *ai; | |
42 | #endif | |
43 | ||
44 | str[0] = '\0'; | |
45 | if (proto) | |
46 | av_strlcatf(str, size, "%s://", proto); | |
47 | if (authorization && authorization[0]) | |
48 | av_strlcatf(str, size, "%s@", authorization); | |
49 | #if CONFIG_NETWORK && defined(AF_INET6) | |
50 | /* Determine if hostname is a numerical IPv6 address, | |
51 | * properly escape it within [] in that case. */ | |
52 | hints.ai_flags = AI_NUMERICHOST; | |
53 | if (!getaddrinfo(hostname, NULL, &hints, &ai)) { | |
54 | if (ai->ai_family == AF_INET6) { | |
55 | av_strlcat(str, "[", size); | |
56 | av_strlcat(str, hostname, size); | |
57 | av_strlcat(str, "]", size); | |
58 | } else { | |
59 | av_strlcat(str, hostname, size); | |
60 | } | |
61 | freeaddrinfo(ai); | |
62 | } else | |
63 | #endif | |
64 | /* Not an IPv6 address, just output the plain string. */ | |
65 | av_strlcat(str, hostname, size); | |
66 | ||
67 | if (port >= 0) | |
68 | av_strlcatf(str, size, ":%d", port); | |
69 | if (fmt) { | |
70 | va_list vl; | |
71 | int len = strlen(str); | |
72 | ||
73 | va_start(vl, fmt); | |
74 | vsnprintf(str + len, size > len ? size - len : 0, fmt, vl); | |
75 | va_end(vl); | |
76 | } | |
77 | return strlen(str); | |
78 | } | |
79 | ||
80 | void ff_make_absolute_url(char *buf, int size, const char *base, | |
81 | const char *rel) | |
82 | { | |
83 | char *sep, *path_query; | |
84 | /* Absolute path, relative to the current server */ | |
85 | if (base && strstr(base, "://") && rel[0] == '/') { | |
86 | if (base != buf) | |
87 | av_strlcpy(buf, base, size); | |
88 | sep = strstr(buf, "://"); | |
89 | if (sep) { | |
90 | /* Take scheme from base url */ | |
91 | if (rel[1] == '/') { | |
92 | sep[1] = '\0'; | |
93 | } else { | |
94 | /* Take scheme and host from base url */ | |
95 | sep += 3; | |
96 | sep = strchr(sep, '/'); | |
97 | if (sep) | |
98 | *sep = '\0'; | |
99 | } | |
100 | } | |
101 | av_strlcat(buf, rel, size); | |
102 | return; | |
103 | } | |
104 | /* If rel actually is an absolute url, just copy it */ | |
105 | if (!base || strstr(rel, "://") || rel[0] == '/') { | |
106 | av_strlcpy(buf, rel, size); | |
107 | return; | |
108 | } | |
109 | if (base != buf) | |
110 | av_strlcpy(buf, base, size); | |
111 | ||
112 | /* Strip off any query string from base */ | |
113 | path_query = strchr(buf, '?'); | |
114 | if (path_query) | |
115 | *path_query = '\0'; | |
116 | ||
117 | /* Is relative path just a new query part? */ | |
118 | if (rel[0] == '?') { | |
119 | av_strlcat(buf, rel, size); | |
120 | return; | |
121 | } | |
122 | ||
123 | /* Remove the file name from the base url */ | |
124 | sep = strrchr(buf, '/'); | |
125 | if (sep) | |
126 | sep[1] = '\0'; | |
127 | else | |
128 | buf[0] = '\0'; | |
129 | while (av_strstart(rel, "../", NULL) && sep) { | |
130 | /* Remove the path delimiter at the end */ | |
131 | sep[0] = '\0'; | |
132 | sep = strrchr(buf, '/'); | |
133 | /* If the next directory name to pop off is "..", break here */ | |
134 | if (!strcmp(sep ? &sep[1] : buf, "..")) { | |
135 | /* Readd the slash we just removed */ | |
136 | av_strlcat(buf, "/", size); | |
137 | break; | |
138 | } | |
139 | /* Cut off the directory name */ | |
140 | if (sep) | |
141 | sep[1] = '\0'; | |
142 | else | |
143 | buf[0] = '\0'; | |
144 | rel += 3; | |
145 | } | |
146 | av_strlcat(buf, rel, size); | |
147 | } |