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 "config.h"
  13
  14 #include <sys/types.h>
  15 #include <netinet/in.h>
  16 #include <sys/socket.h>
  17 #include <netdb.h>
  18 #include <string.h>
  19
  20 #include <system.h>
  21
  22 #include "fake-getnameinfo.h"
  23
  24 #ifndef HAVE_GETNAMEINFO
  25
  26 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
  27                 size_t hostlen, char *serv, size_t servlen, int flags)
  28 {
  29         struct sockaddr_in *sin = (struct sockaddr_in *)sa;
  30         struct hostent *hp;
  31         char tmpserv[16];
  32
  33         if (serv) {
  34                 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
  35                 if (strlen(tmpserv) >= servlen)
  36                         return EAI_MEMORY;
  37                 else
  38                         strcpy(serv, tmpserv);
  39         }
  40
  41         if (host) {
  42                 if (flags & NI_NUMERICHOST) {
  43                         if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
  44                                 return EAI_MEMORY;
  45
  46                         strcpy(host, inet_ntoa(sin->sin_addr));
  47                         return 0;
  48                 } else {
  49                         hp = gethostbyaddr((char *)&sin->sin_addr,
  50                                 sizeof(struct in_addr), AF_INET);
  51                         if (hp == NULL)
  52                                 return EAI_NODATA;
  53
  54                         if (strlen(hp->h_name) >= hostlen)
  55                                 return EAI_MEMORY;
  56
  57                         strcpy(host, hp->h_name);
  58                         return 0;
  59                 }
  60         }
  61         return 0;
  62 }
  63 #endif /* !HAVE_GETNAMEINFO */