external/ibm-public/postfix/dist/src/util/find_inet.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      find_inet 3
   6 /* SUMMARY
   7 /*      inet-domain name services
   8 /* SYNOPSIS
   9 /*      #include <find_inet.h>
  10 /*
  11 /*      unsigned find_inet_addr(host)
  12 /*      const char *host;
  13 /*
  14 /*      int     find_inet_port(port, proto)
  15 /*      const char *port;
  16 /*      const char *proto;
  17 /* DESCRIPTION
  18 /*      These functions translate network address information from
  19 /*      between printable form to the internal the form used by the
  20 /*      BSD TCP/IP network software.
  21 /*
  22 /*      find_inet_addr() translates a symbolic or numerical hostname.
  23 /*      This function is deprecated. Use hostname_to_hostaddr() instead.
  24 /*
  25 /*      find_inet_port() translates a symbolic or numerical port name.
  26 /* BUGS
  27 /*      find_inet_addr() ignores all but the first address listed for
  28 /*      a symbolic hostname.
  29 /* DIAGNOSTICS
  30 /*      Lookup and conversion errors are fatal.
  31 /* LICENSE
  32 /* .ad
  33 /* .fi
  34 /*      The Secure Mailer license must be distributed with this software.
  35 /* AUTHOR(S)
  36 /*      Wietse Venema
  37 /*      IBM T.J. Watson Research
  38 /*      P.O. Box 704
  39 /*      Yorktown Heights, NY 10598, USA
  40 /*--*/
  41
  42 /* System libraries. */
  43
  44 #include <sys_defs.h>
  45 #include <sys/socket.h>
  46 #include <netinet/in.h>
  47 #include <arpa/inet.h>
  48 #include <netdb.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 /* Application-specific. */
  53
  54 #include "msg.h"
  55 #include "stringops.h"
  56 #include "find_inet.h"
  57
  58 #ifndef INADDR_NONE
  59 #define INADDR_NONE 0xffffffff
  60 #endif
  61
  62 /* find_inet_addr - translate numerical or symbolic host name */
  63
  64 unsigned find_inet_addr(const char *host)
  65 {
  66     struct in_addr addr;
  67     struct hostent *hp;
  68
  69     addr.s_addr = inet_addr(host);
  70     if ((addr.s_addr == INADDR_NONE) || (addr.s_addr == 0)) {
  71         if ((hp = gethostbyname(host)) == 0)
  72             msg_fatal("host not found: %s", host);
  73         if (hp->h_addrtype != AF_INET)
  74             msg_fatal("unexpected address family: %d", hp->h_addrtype);
  75         if (hp->h_length != sizeof(addr))
  76             msg_fatal("unexpected address length %d", hp->h_length);
  77         memcpy((char *) &addr, hp->h_addr, hp->h_length);
  78     }
  79     return (addr.s_addr);
  80 }
  81
  82 /* find_inet_port - translate numerical or symbolic service name */
  83
  84 int     find_inet_port(const char *service, const char *protocol)
  85 {
  86     struct servent *sp;
  87     int     port;
  88
  89     if (alldig(service) && (port = atoi(service)) != 0) {
  90         if (port < 0 || port > 65535)
  91             msg_fatal("bad port number: %s", service);
  92         return (htons(port));
  93     } else {
  94         if ((sp = getservbyname(service, protocol)) == 0)
  95             msg_fatal("unknown service: %s/%s", service, protocol);
  96         return (sp->s_port);
  97     }
  98 }