getdomain.c File Reference

DNS lookups. More...

#include "config.h"
#include <assert.h>
#include <netdb.h>
#include <string.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
#include "mutt/lib.h"
#include "lib.h"

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Functions
static struct addrinfo *	mutt_getaddrinfo (const char *node, const struct addrinfo *hints)
	Lookup the host's name using getaddrinfo()
int	getdnsdomainname (struct Buffer *result)
	Lookup the host's name using DNS.

Detailed Description

DNS lookups.

Authors

• Mehdi Abaakouk
• Richard Russon
• Ihor Antonov
• Pietro Cerutti

Copyright

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file getdomain.c.

Function Documentation

mutt_getaddrinfo()

static struct addrinfo * mutt_getaddrinfo ( const char *  node, const struct addrinfo *  hints  )

static

Lookup the host's name using getaddrinfo()

Parameters

node	Hostname, got by gethostname()
hints	Flags to pass to getaddrinfo()

Return values

ptr	Address info
NULL	Error

Note

Caller must free result

Definition at line 103 of file getdomain.c.

{
  assert(node);
  assert(hints);
  struct addrinfo *result = NULL;
  mutt_debug(LL_DEBUG3, "before getaddrinfo\n");
  int rc = getaddrinfo(node, NULL, hints, &result);
  mutt_debug(LL_DEBUG3, "after getaddrinfo\n");
 
  if (rc != 0)
    result = NULL;
 
  return result;
}

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getdnsdomainname()

int getdnsdomainname

(

struct Buffer *

result

)

Lookup the host's name using DNS.

Parameters

result

Buffer were result of the domain name lookup will be stored

Return values

0	Success
-1	Error

Definition at line 125 of file getdomain.c.

{
  assert(result);
  int rc = -1;
 
#if defined(HAVE_GETADDRINFO) || defined(HAVE_GETADDRINFO_A)
  char node[256] = { 0 };
  if (gethostname(node, sizeof(node)) != 0)
    return rc;
 
  struct addrinfo *lookup_result = NULL;
  struct addrinfo hints = { 0 };
 
  buf_reset(result);
  hints.ai_flags = AI_CANONNAME;
  hints.ai_family = AF_UNSPEC;
 
#ifdef HAVE_GETADDRINFO_A
  lookup_result = mutt_getaddrinfo_a(node, &hints);
#else
  lookup_result = mutt_getaddrinfo(node, &hints);
#endif
 
  if (lookup_result && lookup_result->ai_canonname)
  {
    const char *hostname = strchr(lookup_result->ai_canonname, '.');
    if (hostname && hostname[1] != '\0')
    {
      buf_strcpy(result, ++hostname);
      rc = 0;
    }
  }
 
  if (lookup_result)
    freeaddrinfo(lookup_result);
#endif
 
  return rc;
}

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