dnsmx.c

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#include "buffer.h"
#include "exit.h"
#include "logmsg.h"
#include "uint_t.h"
#include "byte.h"
#include "str.h"
#include "fmt.h"
#include "dns.h"
 
#define WHO "dnsmx"
 
void nomem(void)
{
  logmsg(WHO,111,FATAL,"out of memory");
}
 
static char seed[128];
 
static stralloc fqdn;
static char *q;
static stralloc out;
char strnum[FMT_ULONG];
 
int main(int argc,char **argv)
{
  int i;
  int j;
  uint16 pref;
 
  dns_random_init(seed);
 
  if (*argv) ++argv;
 
  while (*argv) {
    if (!stralloc_copys(&fqdn,*argv)) nomem();
    if (dns_mx(&out,&fqdn) < 0)
      logmsg(WHO,111,FATAL,B("unable to find MX records for: ",*argv));
 
    if (!out.len) {
      if (dns_domain_fromdot(&q,*argv,str_len(*argv)) <= 0) nomem();
      if (!stralloc_copys(&out,"0 ")) nomem();
      if (dns_domain_todot_cat(&out,q) <= 0) nomem();
      if (!stralloc_cats(&out,"\n")) nomem();
      buffer_put(buffer_1,out.s,out.len);
    }
    else {
      i = 0;
      while (i + 2 < out.len) {
        j = byte_chr(out.s + i + 2,out.len - i - 2,0);
        uint16_unpack_big(out.s + i,&pref);
        buffer_put(buffer_1,strnum,fmt_ulong(strnum,pref));
        buffer_puts(buffer_1," ");
        buffer_put(buffer_1,out.s + i + 2,j);
        buffer_puts(buffer_1,"\n");
        i += j + 3;
      }
    }
 
    ++argv;
  }
 
  buffer_flush(buffer_1);
  _exit(0);
}