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

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      dns_rr_eq_sa 3
   6 /* SUMMARY
   7 /*      compare resource record with socket address
   8 /* SYNOPSIS
   9 /*      #include <dns.h>
  10 /*
  11 /*      int     dns_rr_eq_sa(DNS_RR *rr, struct sockaddr *sa)
  12 /*      DNS_RR  *rr;
  13 /*      struct sockaddr *sa;
  14 /*
  15 /*      int     DNS_RR_EQ_SA(DNS_RR *rr, struct sockaddr *sa)
  16 /*      DNS_RR  *rr;
  17 /*      struct sockaddr *sa;
  18 /* DESCRIPTION
  19 /*      dns_rr_eq_sa() compares a DNS resource record with a socket
  20 /*      address.  The result is non-zero when the resource type
  21 /*      matches the socket address family, and when the network
  22 /*      address information is identical.
  23 /*
  24 /*      DNS_RR_EQ_SA() is an unsafe macro version for those who live fast.
  25 /*
  26 /*      Arguments:
  27 /* .IP rr
  28 /*      DNS resource record pointer.
  29 /* .IP sa
  30 /*      Binary address pointer.
  31 /* DIAGNOSTICS
  32 /*      Panic: unknown socket address family.
  33 /* LICENSE
  34 /* .ad
  35 /* .fi
  36 /*      The Secure Mailer license must be distributed with this software.
  37 /* AUTHOR(S)
  38 /*      Wietse Venema
  39 /*      IBM T.J. Watson Research
  40 /*      P.O. Box 704
  41 /*      Yorktown Heights, NY 10598, USA
  42 /*--*/
  43
  44 /* System libraries. */
  45
  46 #include <sys_defs.h>
  47
  48 /* Utility library. */
  49
  50 #include <msg.h>
  51 #include <sock_addr.h>
  52
  53 /* DNS library. */
  54
  55 #include <dns.h>
  56
  57 /* dns_rr_eq_sa - compare resource record with socket address */
  58
  59 int     dns_rr_eq_sa(DNS_RR *rr, struct sockaddr * sa)
  60 {
  61     const char *myname = "dns_rr_eq_sa";
  62
  63     if (sa->sa_family == AF_INET) {
  64         return (rr->type == T_A
  65                 && SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR(rr->data).s_addr);
  66 #ifdef HAS_IPV6
  67     } else if (sa->sa_family == AF_INET6) {
  68         return (rr->type == T_AAAA
  69                 && memcmp((char *) &SOCK_ADDR_IN6_ADDR(sa),
  70                           rr->data, rr->data_len) == 0);
  71 #endif
  72     } else {
  73         msg_panic("%s: unsupported socket address family type: %d",
  74                   myname, sa->sa_family);
  75     }
  76 }
  77
  78  /*
  79   * Stand-alone test program.
  80   */
  81 #ifdef TEST
  82 #include <vstream.h>
  83 #include <myaddrinfo.h>
  84 #include <inet_proto.h>
  85
  86 static const char *myname;
  87
  88 static NORETURN usage(void)
  89 {
  90     msg_fatal("usage: %s hostname address", myname);
  91 }
  92
  93 int     main(int argc, char **argv)
  94 {
  95     MAI_HOSTADDR_STR hostaddr;
  96     DNS_RR *rr;
  97     struct addrinfo *res0;
  98     struct addrinfo *res1;
  99     struct addrinfo *res;
 100     int     aierr;
 101
 102     myname = argv[0];
 103
 104     if (argc < 3)
 105         usage();
 106
 107     inet_proto_init(argv[0], INET_PROTO_NAME_ALL);
 108
 109     while (*++argv) {
 110         if (argv[1] == 0)
 111             usage();
 112
 113         if ((aierr = hostaddr_to_sockaddr(argv[1], (char *) 0, 0, &res1)) != 0)
 114             msg_fatal("host address %s: %s", argv[1], MAI_STRERROR(aierr));
 115         if ((rr = dns_sa_to_rr(argv[1], 0, res1->ai_addr)) == 0)
 116             msg_fatal("dns_sa_to_rr: %m");
 117         freeaddrinfo(res1);
 118
 119         if ((aierr = hostname_to_sockaddr(argv[0], (char *) 0, 0, &res0)) != 0)
 120             msg_fatal("host name %s: %s", argv[0], MAI_STRERROR(aierr));
 121         for (res = res0; res != 0; res = res->ai_next) {
 122             SOCKADDR_TO_HOSTADDR(res->ai_addr, res->ai_addrlen,
 123                                  &hostaddr, (MAI_SERVPORT_STR *) 0, 0);
 124             vstream_printf("%s =?= %s\n", hostaddr.buf, argv[1]);
 125             vstream_printf("tested by function: %s\n",
 126                            dns_rr_eq_sa(rr, res->ai_addr) ?
 127                            "yes" : "no");
 128             vstream_printf("tested by macro:    %s\n",
 129                            DNS_RR_EQ_SA(rr, res->ai_addr) ?
 130                            "yes" : "no");
 131         }
 132         dns_rr_free(rr);
 133         freeaddrinfo(res0);
 134         vstream_fflush(VSTREAM_OUT);
 135         argv += 1;
 136     }
 137     return (0);
 138 }
 139
 140 #endif