text: /*
   * 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
   */
  
  #ifndef AVFORMAT_IP_H
  #define AVFORMAT_IP_H
  
  #include "network.h"
  
  /**
   * Structure for storing IP (UDP) source filters or block lists.
   */
  typedef struct IPSourceFilters {
      int nb_include_addrs;
      int nb_exclude_addrs;
      struct sockaddr_storage *include_addrs;
      struct sockaddr_storage *exclude_addrs;
  } IPSourceFilters;
  
  /**
   * Checks the source address against a given IP source filter.
   * @return 0 if packet should be processed based on the filter, 1 if the packet
   *         can be dropped.
   */
  int ff_ip_check_source_lists(struct sockaddr_storage *source_addr_ptr, IPSourceFilters *s);
  
  /**
   * Resolves hostname into an addrinfo structure.
   * @return addrinfo structure which should be freed by the user, NULL in case
   *         of error.
   */
  struct addrinfo *ff_ip_resolve_host(void *log_ctx,
                                      const char *hostname, int port,
                                      int type, int family, int flags);
  
  /**
   * Parses the address[,address] source list in buf and adds it to the filters
   * in the IPSourceFilters structure.
   * @return 0 on success, < 0 AVERROR code on error.
   */
  int ff_ip_parse_sources(void *log_ctx, const char *buf, IPSourceFilters *filters);
  
  /**
   * Parses the address[,address] source block list in buf and adds it to the
   * filters in the IPSourceFilters structure.
   * @return 0 on success, < 0 AVERROR code on error.
   */
  int ff_ip_parse_blocks(void *log_ctx, const char *buf, IPSourceFilters *filters);
  
  /**
   * Resets the IP filter list and frees the internal fields of an
   * IPSourceFilters structure.
   */
  void ff_ip_reset_filters(IPSourceFilters *filters);
  
  #endif /* AVFORMAT_IP_H */
  