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