tinc/lib/fake-getnameinfo.c

46 lines
1.1 KiB
C

/*
* fake library for ssh
*
* This file includes getnameinfo().
* These funtions are defined in rfc2133.
*
* But these functions are not implemented correctly. The minimum subset
* is implemented for ssh use only. For exapmle, this routine assumes
* that ai_family is AF_INET. Don't use it for another purpose.
*/
#include "system.h"
#include "fake-getnameinfo.h"
#include "fake-getaddrinfo.h"
#ifndef HAVE_GETNAMEINFO
int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
{
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
struct hostent *hp;
if(serv)
snprintf(serv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
if(!host)
return 0;
if(flags & NI_NUMERICHOST) {
strncpy(host, inet_ntoa(sin->sin_addr), sizeof(host));
return 0;
}
hp = gethostbyaddr((char *)&sin->sin_addr, sizeof(struct in_addr), AF_INET);
if(!hp || !hp->h_name)
return EAI_NODATA;
if(strlen(hp->h_name) >= hostlen)
return EAI_MEMORY;
strncpy(host, hp->h_name, hostlen);
return 0;
}
#endif /* !HAVE_GETNAMEINFO */