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