mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-04 07:21:31 +02:00
160 lines
4.9 KiB
C
160 lines
4.9 KiB
C
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/*
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* IP common code
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "ip.h"
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#include "libavutil/avstring.h"
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static int compare_addr(const struct sockaddr_storage *a,
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const struct sockaddr_storage *b)
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{
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if (a->ss_family != b->ss_family)
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return 1;
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if (a->ss_family == AF_INET) {
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return (((const struct sockaddr_in *)a)->sin_addr.s_addr !=
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((const struct sockaddr_in *)b)->sin_addr.s_addr);
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}
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#if HAVE_STRUCT_SOCKADDR_IN6
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if (a->ss_family == AF_INET6) {
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const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
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const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;
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return memcmp(s6_addr_a, s6_addr_b, 16);
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}
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#endif
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return 1;
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}
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int ff_ip_check_source_lists(struct sockaddr_storage *source_addr_ptr, IPSourceFilters *s)
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{
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int i;
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if (s->nb_exclude_addrs) {
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for (i = 0; i < s->nb_exclude_addrs; i++) {
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if (!compare_addr(source_addr_ptr, &s->exclude_addrs[i]))
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return 1;
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}
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}
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if (s->nb_include_addrs) {
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for (i = 0; i < s->nb_include_addrs; i++) {
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if (!compare_addr(source_addr_ptr, &s->include_addrs[i]))
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return 0;
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}
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return 1;
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}
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return 0;
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}
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struct addrinfo *ff_ip_resolve_host(void *log_ctx,
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const char *hostname, int port,
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int type, int family, int flags)
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{
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struct addrinfo hints = { 0 }, *res = 0;
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int error;
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char sport[16];
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const char *node = 0, *service = "0";
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if (port > 0) {
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snprintf(sport, sizeof(sport), "%d", port);
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service = sport;
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}
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if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
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node = hostname;
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}
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hints.ai_socktype = type;
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hints.ai_family = family;
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hints.ai_flags = flags;
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if ((error = getaddrinfo(node, service, &hints, &res))) {
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res = NULL;
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av_log(log_ctx, AV_LOG_ERROR, "getaddrinfo(%s, %s): %s\n",
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node ? node : "unknown",
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service,
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gai_strerror(error));
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}
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return res;
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}
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static int ip_parse_addr_list(void *log_ctx, const char *buf,
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struct sockaddr_storage **address_list_ptr,
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int *address_list_size_ptr)
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{
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struct addrinfo *ai = NULL;
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/* Resolve all of the IPs */
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while (buf && buf[0]) {
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char* host = av_get_token(&buf, ",");
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if (!host)
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return AVERROR(ENOMEM);
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ai = ff_ip_resolve_host(log_ctx, host, 0, SOCK_DGRAM, AF_UNSPEC, 0);
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av_freep(&host);
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if (ai) {
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struct sockaddr_storage source_addr = {0};
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memcpy(&source_addr, ai->ai_addr, ai->ai_addrlen);
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freeaddrinfo(ai);
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av_dynarray2_add((void **)address_list_ptr, address_list_size_ptr, sizeof(source_addr), (uint8_t *)&source_addr);
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if (!*address_list_ptr)
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return AVERROR(ENOMEM);
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} else {
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return AVERROR(EINVAL);
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}
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if (*buf)
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buf++;
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}
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return 0;
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}
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static int ip_parse_sources_and_blocks(void *log_ctx, const char *buf, IPSourceFilters *filters, int parse_include_list)
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{
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int ret;
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if (parse_include_list)
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ret = ip_parse_addr_list(log_ctx, buf, &filters->include_addrs, &filters->nb_include_addrs);
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else
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ret = ip_parse_addr_list(log_ctx, buf, &filters->exclude_addrs, &filters->nb_exclude_addrs);
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if (ret >= 0 && filters->nb_include_addrs && filters->nb_exclude_addrs) {
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av_log(log_ctx, AV_LOG_ERROR, "Simultaneously including and excluding sources is not supported.\n");
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return AVERROR(EINVAL);
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}
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return ret;
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}
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int ff_ip_parse_sources(void *log_ctx, const char *buf, IPSourceFilters *filters)
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{
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return ip_parse_sources_and_blocks(log_ctx, buf, filters, 1);
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}
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int ff_ip_parse_blocks(void *log_ctx, const char *buf, IPSourceFilters *filters)
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{
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return ip_parse_sources_and_blocks(log_ctx, buf, filters, 0);
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}
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void ff_ip_reset_filters(IPSourceFilters *filters)
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{
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av_freep(&filters->exclude_addrs);
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av_freep(&filters->include_addrs);
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filters->nb_include_addrs = 0;
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filters->nb_exclude_addrs = 0;
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}
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