www.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 <stdio.h>
  15 #include <sys/types.h>
  16 #include <sys/socket.h>
  17 #include <netinet/in.h>
  18 #include <arpa/inet.h>
  19 #include <netdb.h>
  20 #include <string.h>
  21
  22 #include <system.h>
  23
  24 #include "fake-getnameinfo.h"
  25 #include "fake-getaddrinfo.h"
  26
  27 #ifndef HAVE_GETNAMEINFO
  28
  29 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
  30                 size_t hostlen, char *serv, size_t servlen, int flags)
  31 {
  32         struct sockaddr_in *sin = (struct sockaddr_in *)sa;
  33         struct hostent *hp;
  34         char tmpserv[16];
  35
  36         if (serv) {
  37                 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
  38                 if (strlen(tmpserv) >= servlen)
  39                         return EAI_MEMORY;
  40                 else
  41                         strcpy(serv, tmpserv);
  42         }
  43
  44         if (host) {
  45                 if (flags & NI_NUMERICHOST) {
  46                         if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
  47                                 return EAI_MEMORY;
  48
  49                         strcpy(host, inet_ntoa(sin->sin_addr));
  50                         return 0;
  51                 } else {
  52                         hp = gethostbyaddr((char *)&sin->sin_addr,
  53                                 sizeof(struct in_addr), AF_INET);
  54                         if (hp == NULL)
  55                                 return EAI_NODATA;
  56
  57                         if (strlen(hp->h_name) >= hostlen)
  58                                 return EAI_MEMORY;
  59
  60                         strcpy(host, hp->h_name);
  61                         return 0;
  62                 }
  63         }
  64         return 0;
  65 }
  66 #endif /* !HAVE_GETNAMEINFO */