external/ibm-public/postfix/dist/src/dns/dns_rr_to_pa.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      dns_rr_to_pa 3
   6 /* SUMMARY
   7 /*      resource record to printable address
   8 /* SYNOPSIS
   9 /*      #include <dns.h>
  10 /*
  11 /*      const char *dns_rr_to_pa(rr, hostaddr)
  12 /*      DNS_RR  *rr;
  13 /*      MAI_HOSTADDR_STR *hostaddr;
  14 /* DESCRIPTION
  15 /*      dns_rr_to_pa() converts the address in a DNS resource record
  16 /*      into printable form and returns a pointer to the result.
  17 /*
  18 /*      Arguments:
  19 /* .IP rr
  20 /*      The DNS resource record.
  21 /* .IP hostaddr
  22 /*      Storage for the printable address.
  23 /* DIAGNOSTICS
  24 /*      The result is null in case of problems, with errno set
  25 /*      to indicate the nature of the problem.
  26 /* LICENSE
  27 /* .ad
  28 /* .fi
  29 /*      The Secure Mailer license must be distributed with this software.
  30 /* AUTHOR(S)
  31 /*      Wietse Venema
  32 /*      IBM T.J. Watson Research
  33 /*      P.O. Box 704
  34 /*      Yorktown Heights, NY 10598, USA
  35 /*--*/
  36
  37 /* System libraries. */
  38
  39 #include <sys_defs.h>
  40 #include <sys/socket.h>
  41 #include <netinet/in.h>
  42 #include <arpa/inet.h>
  43 #include <errno.h>
  44
  45 /* Utility library. */
  46
  47 #include <msg.h>
  48
  49 /* DNS library. */
  50
  51 #include <dns.h>
  52
  53 /* dns_rr_to_pa - resource record to printable address */
  54
  55 const char *dns_rr_to_pa(DNS_RR *rr, MAI_HOSTADDR_STR *hostaddr)
  56 {
  57     if (rr->type == T_A) {
  58         return (inet_ntop(AF_INET, rr->data, hostaddr->buf,
  59                           sizeof(hostaddr->buf)));
  60 #ifdef HAS_IPV6
  61     } else if (rr->type == T_AAAA) {
  62         return (inet_ntop(AF_INET6, rr->data, hostaddr->buf,
  63                           sizeof(hostaddr->buf)));
  64 #endif
  65     } else {
  66         errno = EAFNOSUPPORT;
  67         return (0);
  68     }
  69 }
  70
  71  /*
  72   * Stand-alone test program.
  73   */
  74 #ifdef TEST
  75 #include <vstream.h>
  76 #include <myaddrinfo.h>
  77
  78 static const char *myname;
  79
  80 static NORETURN usage(void)
  81 {
  82     msg_fatal("usage: %s dnsaddrtype hostname", myname);
  83 }
  84
  85 int     main(int argc, char **argv)
  86 {
  87     DNS_RR *rr;
  88     MAI_HOSTADDR_STR hostaddr;
  89     VSTRING *why;
  90     int     type;
  91
  92     myname = argv[0];
  93     if (argc < 3)
  94         usage();
  95     why = vstring_alloc(1);
  96
  97     while (*++argv) {
  98         if (argv[1] == 0)
  99             usage();
 100         if ((type = dns_type(argv[0])) == 0)
 101             usage();
 102         if (dns_lookup(argv[1], type, 0, &rr, (VSTRING *) 0, why) != DNS_OK)
 103             msg_fatal("%s: %s", argv[1], vstring_str(why));
 104         if (dns_rr_to_pa(rr, &hostaddr) == 0)
 105             msg_fatal("dns_rr_to_sa: %m");
 106         vstream_printf("%s -> %s\n", argv[1], hostaddr.buf);
 107         vstream_fflush(VSTREAM_OUT);
 108         argv += 1;
 109         dns_rr_free(rr);
 110     }
 111     vstring_free(why);
 112     return (0);
 113 }
 114
 115 #endif