external/bsd/ntp/dist/libntp/decodenetnum.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * decodenetnum - return a net number (this is crude, but careful)
   5  */
   6 #include <config.h>
   7 #include <sys/types.h>
   8 #include <ctype.h>
   9 #ifdef HAVE_SYS_SOCKET_H
  10 #include <sys/socket.h>
  11 #endif
  12 #ifdef HAVE_NETINET_IN_H
  13 #include <netinet/in.h>
  14 #endif
  15
  16 #include "ntp_stdlib.h"
  17 #include "ntp_assert.h"
  18
  19 int
  20 decodenetnum(
  21         const char *num,
  22         sockaddr_u *netnum
  23         )
  24 {
  25         struct addrinfo hints, *ai = NULL;
  26         register int err;
  27         register const char *cp;
  28         char name[80];
  29         char *np;
  30
  31         NTP_REQUIRE(num != NULL);
  32         NTP_REQUIRE(strlen(num) < sizeof(name));
  33
  34         if ('[' != num[0])
  35                 cp = num;
  36         else {
  37                 cp = num + 1;
  38                 np = name;
  39                 while (*cp && ']' != *cp)
  40                         *np++ = *cp++;
  41                 *np = 0;
  42                 cp = name;
  43         }
  44         memset(&hints, 0, sizeof(hints));
  45         hints.ai_flags = AI_NUMERICHOST;
  46         err = getaddrinfo(cp, NULL, &hints, &ai);
  47         if (err != 0)
  48                 return 0;
  49         memcpy(netnum, ai->ai_addr, ai->ai_addrlen);
  50         freeaddrinfo(ai);
  51         return 1;
  52 }