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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: rfc2553emu.cc,v 1.8 2001/02/20 07:03:18 jgg Exp $
/* ######################################################################
RFC 2553 Emulation - Provides emulation for RFC 2553 getaddrinfo,
freeaddrinfo and getnameinfo
This is really C code, it just has a .cc extensions to play nicer with
the rest of APT.
Originally written by Jason Gunthorpe <jgg@debian.org> and placed into
the Public Domain, do with it what you will.
##################################################################### */
/*}}}*/
#include <config.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>
#include <stdio.h>
#include "rfc2553emu.h"
#ifndef HAVE_GETADDRINFO
// getaddrinfo - Resolve a hostname /*{{{*/
// ---------------------------------------------------------------------
/* */
int getaddrinfo(const char *nodename, const char *servname,
const struct addrinfo *hints,
struct addrinfo **res)
{
struct addrinfo **Result = res;
hostent *Addr;
unsigned int Port;
int Proto;
const char *End;
char **CurAddr;
// Try to convert the service as a number
Port = htons(strtol(servname,(char **)&End,0));
Proto = SOCK_STREAM;
if (hints != 0 && hints->ai_socktype != 0)
Proto = hints->ai_socktype;
// Not a number, must be a name.
if (End != servname + strlen(servname))
{
struct servent *Srv = 0;
// Do a lookup in the service database
if (hints == 0 || hints->ai_socktype == SOCK_STREAM)
Srv = getservbyname(servname,"tcp");
if (hints != 0 && hints->ai_socktype == SOCK_DGRAM)
Srv = getservbyname(servname,"udp");
if (Srv == 0)
return EAI_NONAME;
// Get the right protocol
Port = Srv->s_port;
if (strcmp(Srv->s_proto,"tcp") == 0)
Proto = SOCK_STREAM;
else
{
if (strcmp(Srv->s_proto,"udp") == 0)
Proto = SOCK_DGRAM;
else
return EAI_NONAME;
}
if (hints != 0 && hints->ai_socktype != Proto &&
hints->ai_socktype != 0)
return EAI_SERVICE;
}
// Hostname lookup, only if this is not a listening socket
if (hints != 0 && (hints->ai_flags & AI_PASSIVE) != AI_PASSIVE)
{
Addr = gethostbyname(nodename);
if (Addr == 0)
{
if (h_errno == TRY_AGAIN)
return EAI_AGAIN;
if (h_errno == NO_RECOVERY)
return EAI_FAIL;
return EAI_NONAME;
}
// No A records
if (Addr->h_addr_list[0] == 0)
return EAI_NONAME;
CurAddr = Addr->h_addr_list;
}
else
CurAddr = (char **)&End; // Fake!
// Start constructing the linked list
*res = 0;
for (; *CurAddr != 0; CurAddr++)
{
// New result structure
*Result = (struct addrinfo *)calloc(sizeof(**Result),1);
if (*Result == 0)
{
freeaddrinfo(*res);
return EAI_MEMORY;
}
if (*res == 0)
*res = *Result;
(*Result)->ai_family = AF_INET;
(*Result)->ai_socktype = Proto;
// If we have the IPPROTO defines we can set the protocol field
#ifdef IPPROTO_TCP
if (Proto == SOCK_STREAM)
(*Result)->ai_protocol = IPPROTO_TCP;
if (Proto == SOCK_DGRAM)
(*Result)->ai_protocol = IPPROTO_UDP;
#endif
// Allocate space for the address
(*Result)->ai_addrlen = sizeof(struct sockaddr_in);
(*Result)->ai_addr = (struct sockaddr *)calloc(sizeof(sockaddr_in),1);
if ((*Result)->ai_addr == 0)
{
freeaddrinfo(*res);
return EAI_MEMORY;
}
// Set the address
((struct sockaddr_in *)(*Result)->ai_addr)->sin_family = AF_INET;
((struct sockaddr_in *)(*Result)->ai_addr)->sin_port = Port;
if (hints != 0 && (hints->ai_flags & AI_PASSIVE) != AI_PASSIVE)
((struct sockaddr_in *)(*Result)->ai_addr)->sin_addr = *(in_addr *)(*CurAddr);
else
{
// Already zerod by calloc.
break;
}
Result = &(*Result)->ai_next;
}
return 0;
}
/*}}}*/
// freeaddrinfo - Free the result of getaddrinfo /*{{{*/
// ---------------------------------------------------------------------
/* */
void freeaddrinfo(struct addrinfo *ai)
{
while (ai != 0)
{
free(ai->ai_addr);
ai = ai->ai_next;
free(ai);
}
}
/*}}}*/
#endif // HAVE_GETADDRINFO
#ifndef HAVE_GETNAMEINFO
// getnameinfo - Convert a sockaddr to a string /*{{{*/
// ---------------------------------------------------------------------
/* */
int getnameinfo(const struct sockaddr *sa, socklen_t salen,
char *host, size_t hostlen,
char *serv, size_t servlen,
int flags)
{
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
// This routine only supports internet addresses
if (sa->sa_family != AF_INET)
return EAI_ADDRFAMILY;
if (host != 0)
{
// Try to resolve the hostname
if ((flags & NI_NUMERICHOST) != NI_NUMERICHOST)
{
struct hostent *Ent = gethostbyaddr((char *)&sin->sin_addr,sizeof(sin->sin_addr),
AF_INET);
if (Ent != 0)
strncpy(host,Ent->h_name,hostlen);
else
{
if ((flags & NI_NAMEREQD) == NI_NAMEREQD)
{
if (h_errno == TRY_AGAIN)
return EAI_AGAIN;
if (h_errno == NO_RECOVERY)
return EAI_FAIL;
return EAI_NONAME;
}
flags |= NI_NUMERICHOST;
}
}
// Resolve as a plain numberic
if ((flags & NI_NUMERICHOST) == NI_NUMERICHOST)
{
strncpy(host,inet_ntoa(sin->sin_addr),hostlen);
}
}
if (serv != 0)
{
// Try to resolve the hostname
if ((flags & NI_NUMERICSERV) != NI_NUMERICSERV)
{
struct servent *Ent;
if ((flags & NI_DATAGRAM) == NI_DATAGRAM)
Ent = getservbyport(ntohs(sin->sin_port),"udp");
else
Ent = getservbyport(ntohs(sin->sin_port),"tcp");
if (Ent != 0)
strncpy(serv,Ent->s_name,servlen);
else
{
if ((flags & NI_NAMEREQD) == NI_NAMEREQD)
return EAI_NONAME;
flags |= NI_NUMERICSERV;
}
}
// Resolve as a plain numberic
if ((flags & NI_NUMERICSERV) == NI_NUMERICSERV)
{
snprintf(serv,servlen,"%u",ntohs(sin->sin_port));
}
}
return 0;
}
/*}}}*/
#endif // HAVE_GETNAMEINFO
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