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

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      dns_sa_to_rr 3
   6 /* SUMMARY
   7 /*      socket address to resource record
   8 /* SYNOPSIS
   9 /*      #include <dns.h>
  10 /*
  11 /*      DNS_RR  *dns_sa_to_rr(hostname, pref, sa)
  12 /*      const char *hostname;
  13 /*      unsigned pref;
  14 /*      struct sockaddr *sa;
  15 /* DESCRIPTION
  16 /*      dns_sa_to_rr() converts a socket address into a DNS resource record.
  17 /*
  18 /*      Arguments:
  19 /* .IP hostname
  20 /*      The resource record host name.
  21 /* .IP pref
  22 /*      The resource record MX host preference, if applicable.
  23 /* .IP sa
  24 /*      Binary address.
  25 /* DIAGNOSTICS
  26 /*      The result is a null pointer in case of problems, with the
  27 /*      errno variable set to indicate the problem type.
  28 /* LICENSE
  29 /* .ad
  30 /* .fi
  31 /*      The Secure Mailer license must be distributed with this software.
  32 /* AUTHOR(S)
  33 /*      Wietse Venema
  34 /*      IBM T.J. Watson Research
  35 /*      P.O. Box 704
  36 /*      Yorktown Heights, NY 10598, USA
  37 /*--*/
  38
  39 /* System libraries. */
  40
  41 #include <sys_defs.h>
  42 #include <errno.h>
  43
  44 /* Utility library. */
  45
  46 #include <msg.h>
  47
  48 /* DNS library. */
  49
  50 #include <dns.h>
  51
  52 /* dns_sa_to_rr - socket address to resource record */
  53
  54 DNS_RR *dns_sa_to_rr(const char *hostname, unsigned pref, struct sockaddr * sa)
  55 {
  56 #define DUMMY_TTL       0
  57
  58     if (sa->sa_family == AF_INET) {
  59         return (dns_rr_create(hostname, hostname, T_A, C_IN, DUMMY_TTL, pref,
  60                               (char *) &SOCK_ADDR_IN_ADDR(sa),
  61                               sizeof(SOCK_ADDR_IN_ADDR(sa))));
  62 #ifdef HAS_IPV6
  63     } else if (sa->sa_family == AF_INET6) {
  64         return (dns_rr_create(hostname, hostname, T_AAAA, C_IN, DUMMY_TTL, pref,
  65                               (char *) &SOCK_ADDR_IN6_ADDR(sa),
  66                               sizeof(SOCK_ADDR_IN6_ADDR(sa))));
  67 #endif
  68     } else {
  69         errno = EAFNOSUPPORT;
  70         return (0);
  71     }
  72 }
  73
  74  /*
  75   * Stand-alone test program.
  76   */
  77 #ifdef TEST
  78 #include <vstream.h>
  79 #include <myaddrinfo.h>
  80 #include <inet_proto.h>
  81
  82 static const char *myname;
  83
  84 static NORETURN usage(void)
  85 {
  86     msg_fatal("usage: %s hostname", myname);
  87 }
  88
  89 int     main(int argc, char **argv)
  90 {
  91     MAI_HOSTADDR_STR hostaddr;
  92     struct addrinfo *res0;
  93     struct addrinfo *res;
  94     DNS_RR *rr;
  95     int     aierr;
  96
  97     myname = argv[0];
  98     if (argc < 2)
  99         usage();
 100
 101     inet_proto_init(argv[0], INET_PROTO_NAME_ALL);
 102
 103     while (*++argv) {
 104         if ((aierr = hostname_to_sockaddr(argv[0], (char *) 0, 0, &res0)) != 0)
 105             msg_fatal("%s: %s", argv[0], MAI_STRERROR(aierr));
 106         for (res = res0; res != 0; res = res->ai_next) {
 107             if ((rr = dns_sa_to_rr(argv[0], 0, res->ai_addr)) == 0)
 108                 msg_fatal("dns_sa_to_rr: %m");
 109             if (dns_rr_to_pa(rr, &hostaddr) == 0)
 110                 msg_fatal("dns_rr_to_pa: %m");
 111             vstream_printf("%s -> %s\n", argv[0], hostaddr.buf);
 112             vstream_fflush(VSTREAM_OUT);
 113             dns_rr_free(rr);
 114         }
 115         freeaddrinfo(res0);
 116     }
 117     return (0);
 118 }
 119
 120 #endif