dns.c File Reference

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <unistd.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/dns.h>
#include "asterisk/endian.h"

Include dependency graph for dns.c:

Go to the source code of this file.

Data Structures
struct	dns_HEADER
struct	dn_answer
Defines
#define	MAX_SIZE   4096
Functions
	AST_MUTEX_DEFINE_STATIC (res_lock)
int	ast_search_dns (void *context, const char *dname, int class, int type, int(*callback)(void *context, u_char *answer, int len, u_char *fullanswer))
Variables
struct dn_answer	__packed__

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Define Documentation

#define MAX_SIZE   4096

Definition at line 24 of file dns.c.

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Function Documentation

AST_MUTEX_DEFINE_STATIC

(

res_lock

)

int ast_search_dns	(	void *	context,
		const char *	dname,
		int	class,
		int	type,
		int(*)(void *context, u_char *answer, int len, u_char *fullanswer)	callback
	)

Definition at line 164 of file dns.c.

{
#ifdef HAS_RES_NINIT
   struct __res_state dnsstate;
#endif
   char answer[MAX_SIZE];
   int res, ret = -1;

#ifdef HAS_RES_NINIT
   res_ninit(&dnsstate);
   res = res_nsearch(&dnsstate, dname, class, type, answer, sizeof(answer));
#else
   ast_mutex_lock(&res_lock);
   res_init();
   res = res_search(dname, class, type, answer, sizeof(answer));
#endif
   if (res > 0) {
      if ((res = dns_parse_answer(context, class, type, answer, res, callback)) < 0) {
         ast_log(LOG_WARNING, "Parse error\n");
         ret = -1;
      }
      else if (ret == 0) {
         ast_log(LOG_DEBUG, "No matches found\n");
         ret = 0;
      }
      else
         ret = 1;
   }
#ifdef HAS_RES_NINIT
   res_nclose(&dnsstate);
#else
#ifndef __APPLE__
   res_close();
#endif
   ast_mutex_unlock(&res_lock);
#endif
   return ret;
}

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Variable Documentation

struct dn_answer __packed__