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/*
* lib/inet6.c This file contains an implementation of the "INET6"
* support functions for the net-tools.
* (most of it copied from lib/inet.c 1.26).
*
* Version: $Id: inet6.c,v 1.13 2010-07-05 22:52:00 ecki Exp $
*
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
* Copyright 1993 MicroWalt Corporation
*
* Modified:
*960808 {0.01} Frank Strauss : adapted for IPv6 support
*980701 {0.02} Arnaldo C. Melo: GNU gettext instead of catgets
*990824 Bernd Eckenfels: clear members for selecting v6 address
*
* 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 of the License, or (at
* your option) any later version.
*/
#include "config.h"
#if HAVE_AFINET6
#include <asm/types.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include "version.h"
#include "net-support.h"
#include "pathnames.h"
#include "intl.h"
#include "util.h"
extern int h_errno; /* some netdb.h versions don't export this */
char * fix_v4_address(char *buf, struct in6_addr *in6)
{
if (IN6_IS_ADDR_V4MAPPED(in6->s6_addr)) {
char *s =strchr(buf, '.');
if (s) {
while (s > buf && *s != ':')
--s;
if (*s == ':') ++s;
else s = NULL;
}
if (s) return s;
}
return buf;
}
static int INET6_resolve(char *name, struct sockaddr_in6 *sin6)
{
struct addrinfo req, *ai;
int s;
memset (&req, '\0', sizeof req);
req.ai_family = AF_INET6;
if ((s = getaddrinfo(name, NULL, &req, &ai))) {
fprintf(stderr, "getaddrinfo: %s: %d\n", name, s);
return -1;
}
memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
freeaddrinfo(ai);
return (0);
}
#ifndef IN6_IS_ADDR_UNSPECIFIED
#define IN6_IS_ADDR_UNSPECIFIED(a) \
(((__u32 *) (a))[0] == 0 && ((__u32 *) (a))[1] == 0 && \
((__u32 *) (a))[2] == 0 && ((__u32 *) (a))[3] == 0)
#endif
static int INET6_rresolve(char *name, struct sockaddr_in6 *sin6, int numeric)
{
int s;
/* Grmpf. -FvK */
if (sin6->sin6_family != AF_INET6) {
#ifdef DEBUG
fprintf(stderr, _("rresolve: unsupport address family %d !\n"),
sin6->sin6_family);
#endif
errno = EAFNOSUPPORT;
return (-1);
}
if (numeric & 0x7FFF) {
inet_ntop( AF_INET6, &sin6->sin6_addr, name, 80);
return (0);
}
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (numeric & 0x8000)
strcpy(name, "default");
else
strcpy(name, "[::]");
return (0);
}
if ((s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
name, 255 /* !! */ , NULL, 0, 0))) {
fputs("getnameinfo failed\n", stderr);
return -1;
}
return (0);
}
static void INET6_reserror(char *text)
{
herror(text);
}
/* Display an Internet socket address. */
static char *INET6_print(unsigned char *ptr)
{
static char name[80];
inet_ntop(AF_INET6, (struct in6_addr *) ptr, name, 80);
return fix_v4_address(name, (struct in6_addr *)ptr);
}
/* Display an Internet socket address. */
/* dirty! struct sockaddr usually doesn't suffer for inet6 addresses, fst. */
static char *INET6_sprint(struct sockaddr *sap, int numeric)
{
static char buff[128];
if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));
if (INET6_rresolve(buff, (struct sockaddr_in6 *) sap, numeric) != 0)
return safe_strncpy(buff, _("[UNKNOWN]"), sizeof(buff));
return (fix_v4_address(buff, &((struct sockaddr_in6 *)sap)->sin6_addr));
}
static int INET6_getsock(char *bufp, struct sockaddr *sap)
{
struct sockaddr_in6 *sin6;
char *p;
sin6 = (struct sockaddr_in6 *) sap;
sin6->sin6_family = AF_INET6;
sin6->sin6_port = 0;
sin6->sin6_scope_id = 0;
sin6->sin6_flowinfo = 0;
if (inet_pton(AF_INET6, bufp, sin6->sin6_addr.s6_addr) <= 0)
return (-1);
p = fix_v4_address(bufp, &sin6->sin6_addr);
if (p != bufp)
memcpy(bufp, p, strlen(p)+1);
return 16; /* ?;) */
}
static int INET6_input(int type, char *bufp, struct sockaddr *sap)
{
switch (type) {
case 1:
return (INET6_getsock(bufp, sap));
default:
return (INET6_resolve(bufp, (struct sockaddr_in6 *) sap));
}
}
struct aftype inet6_aftype =
{
"inet6", NULL, /*"IPv6", */ AF_INET6, sizeof(struct in6_addr),
INET6_print, INET6_sprint, INET6_input, INET6_reserror,
INET6_rprint, INET6_rinput, NULL,
-1,
"/proc/net/if_inet6"
};
#endif /* HAVE_AFINET6 */
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