dnsmxip.c

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#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include "buffer.h"
#include "stralloc.h"
#include "fmt.h"
#include "dnsresolv.h"
#include "ip.h"
#include "now.h"
#include "exit.h"
#include "dns.h"
#include "logmsg.h"
#include "str.h"
 
#define WHO "dnsmxip"
 
static stralloc sa = {0};
static stralloc ia = {0}; 
static stralloc out = {0};
static stralloc ipaddr = {0}; 
 
int dns_ia(stralloc *ip,char *s)
{
  int i;
  int j = 0;
  int r = 0;
  char ip4str[IP4_FMT];
  char ip6str[IP6_FMT];
 
  if (!stralloc_copys(&sa,s)) return -1;
  if (sa.s[sa.len-1] != '.')
    if (!stralloc_append(&sa,".")) return -1;
  if (!stralloc_copys(ip,"")) return -1;
 
  DNS_INIT 
  if (dns_ip6(&ia,&sa) > 0) {
    for (i = 0; i + 16 <= ia.len; i += 16) {
      if (ip6_isv4mapped(ia.s + i)) continue; 
      j = ip6_fmt(ip6str,ia.s + i);
      r += j;
      if (!stralloc_catb(ip,ip6str,j)) return -1;
      if (!stralloc_cats(ip," ")) return -1;
      r++;
    }
  }
 
  if (dns_ip4(&ia,&sa) > 0) {
    for (i = 0; i + 4 <= ia.len; i += 4) {
      j = ip4_fmt(ip4str,ia.s + i);
      r += j;
      if (!stralloc_catb(ip,ip4str,j)) return -1;
      if (!stralloc_cats(ip," ")) return -1;
      r++;
    }
  }
  if (!stralloc_0(ip)) return -1;
 
  return r?r-1:0;
}
 
int main(int argc,char * const *argv)
{
  int j, k, r;
  uint16 u;
  int len;
  char num[FMT_ULONG];
 
  if (!argv[1]) 
    logmsg(WHO,100,USAGE,"dnsmx fqdn");
  if (!stralloc_copys(&sa,argv[1]))
    logmsg(WHO,111,FATAL,"out of memory");
 
  DNS_INIT 
  if ((r = dns_mx(&out,&sa)) < 0) _exit(1);
  if (r > 0) {
    j = len = 0;
    do {
      j = str_chr(out.s + len + 2,'\0');
      k = dns_ia(&ipaddr,out.s + len + 2);        /* IP */
      if (k) {
        buffer_put(buffer_1,out.s + len + 2,j);   /* MX */
        buffer_puts(buffer_1,": ");
        out.s[len + 3] = '\0';
        uint16_unpack_big(out.s + len,&u);    
        buffer_put(buffer_1,num,fmt_ulong(num,u)) ;
        buffer_puts(buffer_1," [");
        buffer_put(buffer_1,ipaddr.s,k);
        buffer_puts(buffer_1,"]");
      }
      buffer_putsflush(buffer_1,"\n");
      len += j + 3;
    } while (len < out.len);
  } else {                                       /* A/AAAA */
    k = dns_ia(&ipaddr,argv[1]);                 /* IP */
    if (k) {
      buffer_puts(buffer_1,argv[1]); 
      buffer_puts(buffer_1,": -");
      buffer_puts(buffer_1," [");
      buffer_put(buffer_1,ipaddr.s,k);
      buffer_puts(buffer_1,"]");
      buffer_putsflush(buffer_1,"\n");
    } 
  }
 
  _exit(0);
}