crypto/openssh/openbsd-compat/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 "includes.h"
  13 #include "ssh.h"
  14
  15 RCSID("$Id: fake-getnameinfo.c,v 1.2 2001/02/09 01:55:36 djm Exp $");
  16
  17 #ifndef HAVE_GETNAMEINFO
  18 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
  19                 size_t hostlen, char *serv, size_t servlen, int flags)
  20 {
  21         struct sockaddr_in *sin = (struct sockaddr_in *)sa;
  22         struct hostent *hp;
  23         char tmpserv[16];
  24
  25         if (serv) {
  26                 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
  27                 if (strlen(tmpserv) >= servlen)
  28                         return EAI_MEMORY;
  29                 else
  30                         strcpy(serv, tmpserv);
  31         }
  32
  33         if (host) {
  34                 if (flags & NI_NUMERICHOST) {
  35                         if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
  36                                 return EAI_MEMORY;
  37
  38                         strcpy(host, inet_ntoa(sin->sin_addr));
  39                         return 0;
  40                 } else {
  41                         hp = gethostbyaddr((char *)&sin->sin_addr,
  42                                 sizeof(struct in_addr), AF_INET);
  43                         if (hp == NULL)
  44                                 return EAI_NODATA;
  45
  46                         if (strlen(hp->h_name) >= hostlen)
  47                                 return EAI_MEMORY;
  48
  49                         strcpy(host, hp->h_name);
  50                         return 0;
  51                 }
  52         }
  53         return 0;
  54 }
  55 #endif /* !HAVE_GETNAMEINFO */