1 /*
2 * IP common code
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "ip.h"
22 #include "libavutil/avstring.h"
23
compare_addr(const struct sockaddr_storage * a,const struct sockaddr_storage * b)24 static int compare_addr(const struct sockaddr_storage *a,
25 const struct sockaddr_storage *b)
26 {
27 if (a->ss_family != b->ss_family)
28 return 1;
29 if (a->ss_family == AF_INET) {
30 return (((const struct sockaddr_in *)a)->sin_addr.s_addr !=
31 ((const struct sockaddr_in *)b)->sin_addr.s_addr);
32 }
33
34 #if HAVE_STRUCT_SOCKADDR_IN6
35 if (a->ss_family == AF_INET6) {
36 const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
37 const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;
38 return memcmp(s6_addr_a, s6_addr_b, 16);
39 }
40 #endif
41 return 1;
42 }
43
ff_ip_check_source_lists(struct sockaddr_storage * source_addr_ptr,IPSourceFilters * s)44 int ff_ip_check_source_lists(struct sockaddr_storage *source_addr_ptr, IPSourceFilters *s)
45 {
46 int i;
47 if (s->nb_exclude_addrs) {
48 for (i = 0; i < s->nb_exclude_addrs; i++) {
49 if (!compare_addr(source_addr_ptr, &s->exclude_addrs[i]))
50 return 1;
51 }
52 }
53 if (s->nb_include_addrs) {
54 for (i = 0; i < s->nb_include_addrs; i++) {
55 if (!compare_addr(source_addr_ptr, &s->include_addrs[i]))
56 return 0;
57 }
58 return 1;
59 }
60 return 0;
61 }
62
ff_ip_resolve_host(void * log_ctx,const char * hostname,int port,int type,int family,int flags)63 struct addrinfo *ff_ip_resolve_host(void *log_ctx,
64 const char *hostname, int port,
65 int type, int family, int flags)
66 {
67 struct addrinfo hints = { 0 }, *res = 0;
68 int error;
69 char sport[16];
70 const char *node = 0, *service = "0";
71
72 if (port > 0) {
73 snprintf(sport, sizeof(sport), "%d", port);
74 service = sport;
75 }
76 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
77 node = hostname;
78 }
79 hints.ai_socktype = type;
80 hints.ai_family = family;
81 hints.ai_flags = flags;
82 if ((error = getaddrinfo(node, service, &hints, &res))) {
83 res = NULL;
84 av_log(log_ctx, AV_LOG_ERROR, "getaddrinfo(%s, %s): %s\n",
85 node ? node : "unknown",
86 service,
87 gai_strerror(error));
88 }
89
90 return res;
91 }
92
93
ip_parse_addr_list(void * log_ctx,const char * buf,struct sockaddr_storage ** address_list_ptr,int * address_list_size_ptr)94 static int ip_parse_addr_list(void *log_ctx, const char *buf,
95 struct sockaddr_storage **address_list_ptr,
96 int *address_list_size_ptr)
97 {
98 struct addrinfo *ai = NULL;
99
100 /* Resolve all of the IPs */
101
102 while (buf && buf[0]) {
103 char* host = av_get_token(&buf, ",");
104 if (!host)
105 return AVERROR(ENOMEM);
106
107 ai = ff_ip_resolve_host(log_ctx, host, 0, SOCK_DGRAM, AF_UNSPEC, 0);
108 av_freep(&host);
109
110 if (ai) {
111 struct sockaddr_storage source_addr = {0};
112 memcpy(&source_addr, ai->ai_addr, ai->ai_addrlen);
113 freeaddrinfo(ai);
114 av_dynarray2_add((void **)address_list_ptr, address_list_size_ptr, sizeof(source_addr), (uint8_t *)&source_addr);
115 if (!*address_list_ptr)
116 return AVERROR(ENOMEM);
117 } else {
118 return AVERROR(EINVAL);
119 }
120
121 if (*buf)
122 buf++;
123 }
124
125 return 0;
126 }
127
ip_parse_sources_and_blocks(void * log_ctx,const char * buf,IPSourceFilters * filters,int parse_include_list)128 static int ip_parse_sources_and_blocks(void *log_ctx, const char *buf, IPSourceFilters *filters, int parse_include_list)
129 {
130 int ret;
131 if (parse_include_list)
132 ret = ip_parse_addr_list(log_ctx, buf, &filters->include_addrs, &filters->nb_include_addrs);
133 else
134 ret = ip_parse_addr_list(log_ctx, buf, &filters->exclude_addrs, &filters->nb_exclude_addrs);
135
136 if (ret >= 0 && filters->nb_include_addrs && filters->nb_exclude_addrs) {
137 av_log(log_ctx, AV_LOG_ERROR, "Simultaneously including and excluding sources is not supported.\n");
138 return AVERROR(EINVAL);
139 }
140 return ret;
141 }
142
ff_ip_parse_sources(void * log_ctx,const char * buf,IPSourceFilters * filters)143 int ff_ip_parse_sources(void *log_ctx, const char *buf, IPSourceFilters *filters)
144 {
145 return ip_parse_sources_and_blocks(log_ctx, buf, filters, 1);
146 }
147
ff_ip_parse_blocks(void * log_ctx,const char * buf,IPSourceFilters * filters)148 int ff_ip_parse_blocks(void *log_ctx, const char *buf, IPSourceFilters *filters)
149 {
150 return ip_parse_sources_and_blocks(log_ctx, buf, filters, 0);
151 }
152
ff_ip_reset_filters(IPSourceFilters * filters)153 void ff_ip_reset_filters(IPSourceFilters *filters)
154 {
155 av_freep(&filters->exclude_addrs);
156 av_freep(&filters->include_addrs);
157 filters->nb_include_addrs = 0;
158 filters->nb_exclude_addrs = 0;
159 }
160