lib/fake-getnameinfo.c

   1 /*
   2  * fake library for ssh
   3  *
   4  * This file includes getnameinfo().
   5  * These funtions are defined in rfc2133.
   6  *
   7  * But these functions are not implemented correctly. The minimum subset
   8  * is implemented for ssh use only. For exapmle, this routine assumes
   9  * that ai_family is AF_INET. Don't use it for another purpose.
  10  */
  11
  12 #include "config.h"
  13
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <system.h>
  17
  18 /* RCSID("$Id: fake-getnameinfo.c,v 1.1.2.2 2002/06/09 15:50:11 zarq Exp $"); */
  19
  20 #ifndef HAVE_GETNAMEINFO
  21
  22 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
  23                 size_t hostlen, char *serv, size_t servlen, int flags)
  24 {
  25         struct sockaddr_in *sin = (struct sockaddr_in *)sa;
  26         struct hostent *hp;
  27         char tmpserv[16];
  28
  29         if (serv) {
  30                 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
  31                 if (strlen(tmpserv) >= servlen)
  32                         return EAI_MEMORY;
  33                 else
  34                         strcpy(serv, tmpserv);
  35         }
  36
  37         if (host) {
  38                 if (flags & NI_NUMERICHOST) {
  39                         if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
  40                                 return EAI_MEMORY;
  41
  42                         strcpy(host, inet_ntoa(sin->sin_addr));
  43                         return 0;
  44                 } else {
  45                         hp = gethostbyaddr((char *)&sin->sin_addr,
  46                                 sizeof(struct in_addr), AF_INET);
  47                         if (hp == NULL)
  48                                 return EAI_NODATA;
  49
  50                         if (strlen(hp->h_name) >= hostlen)
  51                                 return EAI_MEMORY;
  52
  53                         strcpy(host, hp->h_name);
  54                         return 0;
  55                 }
  56         }
  57         return 0;
  58 }
  59 #endif /* !HAVE_GETNAMEINFO */