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/*
getinfos.c - implementation of getaddrinfo(), getnameinfo() and related
functions for systems that lack it
note that these functions are implemented only for use
in cvsd and are probably incomplete for other purposes
Copyright (C) 2003 Arthur de Jong
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "getinfos.h"
#include "xmalloc.h"
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif /* HAVE_NETDB_H */
/* this is a very poor implementation of the getaddrinfo() function
it only returns IPv4 stream addresses, regardless of the input
only numericly specified services (port numbers) are supported
hints are completely ignored */
int getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints,
struct addrinfo **res)
{
char *tmp;
struct sockaddr_in *addr;
struct hostent *hent;
*res=NULL;
/* allocate address */
addr=(struct sockaddr_in *)xmalloc(sizeof(struct sockaddr_in));
addr->sin_family=AF_INET;
/* check node */
if ((node==NULL)||
(strcmp(node,"*")==0)||
(strcmp(node,"0.0.0.0")==0))
addr->sin_addr.s_addr=INADDR_ANY;
else if ((hent=gethostbyname(node))!=NULL)
memcpy(&addr->sin_addr.s_addr,hent->h_addr,4);
else
{
free(addr);
return EAI_HERR;
}
/* check service */
/* TODO: maybe use getservbyname() */
addr->sin_port=htons((int)strtol(service,&tmp,0));
if (*tmp!='\0')
{
free(addr);
return EAI_WRONSERVC;
}
/* build result */
*res=(struct addrinfo *)xmalloc(sizeof(struct addrinfo));
(*res)->ai_flags=0;
(*res)->ai_family=AF_INET;
(*res)->ai_socktype=SOCK_STREAM;
(*res)->ai_protocol=0;
(*res)->ai_addrlen=(socklen_t)sizeof(struct sockaddr_in);
(*res)->ai_addr=(struct sockaddr *)addr;
(*res)->ai_canonname=NULL;
(*res)->ai_next=NULL;
/* and we're done */
return EAI_OK;
}
/* this is a poor implementation of getnameinfo()
it lacks name lookups and only returns numeric values */
int getnameinfo(const struct sockaddr *sa,socklen_t salen,
char *host,size_t hostlen,
char *serv,size_t servlen,int flags)
{
const struct sockaddr_in *caddr;
caddr=(const struct sockaddr_in *)sa;
if (salen!=(socklen_t)sizeof(struct sockaddr_in))
return EAI_WRONGSOCK;
/* save ip */
if ((host!=NULL)&&(hostlen>0))
{
/* TODO: use gethostbyaddr() or getipnodebyaddr() */
snprintf(host,hostlen,"%s",inet_ntoa(caddr->sin_addr));
host[hostlen-1]='\0';
}
/* save port */
if ((serv!=NULL)&&(servlen>0))
{
/* TODO: use getservbyport() */
snprintf(serv,servlen,"%d",(int)ntohs(caddr->sin_port));
serv[servlen-1]='\0';
}
return EAI_OK;
}
/* free address information allocated by getaddrinfo */
void freeaddrinfo(struct addrinfo *res)
{
/* do recursively */
if (res==NULL) return;
freeaddrinfo(res->ai_next);
/* free memory */
free(res->ai_addr);
free(res);
}
/* translate an error codes returned by getaddrinfo() and
getnameinfo() to printable error strings */
const char *gai_strerror(int errcode)
{
switch (errcode)
{
case EAI_OK: return "nothing wrong";
case EAI_SYSTEM: return "see errno";
case EAI_WRONGNODE: return "currently only '*' is supported";
case EAI_WRONSERVC: return "only support for numeric services";
case EAI_WRONGSOCK: return "wrong socket type returned";
#ifdef HAVE_HSTRERROR
case EAI_HERR: return hstrerror(h_errno);
#else /* HAVE_HSTRERROR */
case EAI_HERR:
switch(h_errno)
{
#ifdef HOST_NOT_FOUND
case HOST_NOT_FOUND: return "host not found";
#endif /* HOST_NOT_FOUND */
#ifdef NO_ADDRESS
case NO_ADDRESS: return "no address associated with that name";
#else /* NO_ADDRESS */
#ifdef NO_DATA
case NO_DATA: return "no address associated with that name";
#endif /* NO_DATA */
#endif /* not NO_ADDRESS */
#ifdef NO_RECOVERY
case NO_RECOVERY: return "unrecoverable error";
#endif /* NO_RECOVERY */
#ifdef TRY_AGAIN
case TRY_AGAIN: return "temporary error";
#endif /* TRY_AGAIN */
default: return "unknown";
}
#endif /* not HAVE_HSTRERROR */
default: return "unknown";
}
}
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