| 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 | } |