tinc/src/netutl.c

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/*
netutl.c -- some supporting network utility code
Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>
2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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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.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: netutl.c,v 1.12.4.40 2002/06/21 10:11:12 guus Exp $
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*/
#include "config.h"
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
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#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
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#endif
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#include <string.h>
#include <signal.h>
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#include <sys/socket.h>
#include <syslog.h>
#include <arpa/inet.h>
#include <utils.h>
#include <xalloc.h>
#include "errno.h"
#include "conf.h"
#include "net.h"
#include "netutl.h"
#include "system.h"
int hostnames = 0;
/*
Turn a string into a struct addrinfo.
Return NULL on failure.
*/
struct addrinfo *str2addrinfo(char *address, char *service, int socktype)
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{
struct addrinfo hint, *ai;
int err;
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cp
memset(&hint, 0, sizeof(hint));
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hint.ai_family = addressfamily;
hint.ai_socktype = socktype;
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if((err = getaddrinfo(address, service, &hint, &ai)))
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{
if(debug_lvl >= DEBUG_ERROR)
syslog(LOG_WARNING, _("Error looking up %s port %s: %s\n"), address, service, gai_strerror(err));
cp_trace();
return NULL;
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}
cp
return ai;
}
sockaddr_t str2sockaddr(char *address, char *port)
{
struct addrinfo hint, *ai;
sockaddr_t result;
int err;
cp
memset(&hint, 0, sizeof(hint));
hint.ai_family = AF_UNSPEC;
hint.ai_flags = AI_NUMERICHOST;
hint.ai_socktype = SOCK_STREAM;
if((err = getaddrinfo(address, port, &hint, &ai) || !ai))
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{
syslog(LOG_ERR, _("Error looking up %s port %s: %s\n"), address, port, gai_strerror(err));
cp_trace();
raise(SIGFPE);
exit(0);
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}
result = *(sockaddr_t *)ai->ai_addr;
freeaddrinfo(ai);
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cp
return result;
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}
void sockaddr2str(sockaddr_t *sa, char **addrstr, char **portstr)
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{
char address[NI_MAXHOST];
char port[NI_MAXSERV];
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char *scopeid;
int err;
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cp
if((err = getnameinfo(&sa->sa, SALEN(sa->sa), address, sizeof(address), port, sizeof(port), NI_NUMERICHOST|NI_NUMERICSERV)))
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{
syslog(LOG_ERR, _("Error while translating addresses: %s"), gai_strerror(err));
cp_trace();
raise(SIGFPE);
exit(0);
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}
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if((scopeid = strchr(address, '%')))
*scopeid = '\0'; /* Descope. */
*addrstr = xstrdup(address);
*portstr = xstrdup(port);
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cp
}
char *sockaddr2hostname(sockaddr_t *sa)
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{
char *str;
char address[NI_MAXHOST] = "unknown";
char port[NI_MAXSERV] = "unknown";
int err;
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cp
if((err = getnameinfo(&sa->sa, SALEN(sa->sa), address, sizeof(address), port, sizeof(port), hostnames?0:(NI_NUMERICHOST|NI_NUMERICSERV))))
{
syslog(LOG_ERR, _("Error while looking up hostname: %s"), gai_strerror(err));
}
asprintf(&str, _("%s port %s"), address, port);
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cp
return str;
}
int sockaddrcmp(sockaddr_t *a, sockaddr_t *b)
{
int result;
cp
result = a->sa.sa_family - b->sa.sa_family;
if(result)
return result;
switch(a->sa.sa_family)
{
case AF_UNSPEC:
return 0;
case AF_INET:
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result = memcmp(&a->in.sin_addr, &b->in.sin_addr, sizeof(a->in.sin_addr));
if(result)
return result;
return memcmp(&a->in.sin_port, &b->in.sin_port, sizeof(a->in.sin_port));
case AF_INET6:
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result = memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr));
if(result)
return result;
return memcmp(&a->in6.sin6_port, &b->in6.sin6_port, sizeof(a->in6.sin6_port));
default:
syslog(LOG_ERR, _("sockaddrcmp() was called with unknown address family %d, exitting!"), a->sa.sa_family);
cp_trace();
raise(SIGFPE);
exit(0);
}
cp
}
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void sockaddrunmap(sockaddr_t *sa)
{
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if(sa->sa.sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sa->in6.sin6_addr))
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{
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sa->in.sin_addr.s_addr = ((uint32_t *)&sa->in6.sin6_addr)[3];
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sa->in.sin_family = AF_INET;
}
}
/* Subnet mask handling */
int maskcmp(void *va, void *vb, int masklen, int len)
{
int i, m, result;
char *a = va;
char *b = vb;
cp
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for(m = masklen, i = 0; m >= 8; m -= 8, i++)
if((result = a[i] - b[i]))
return result;
if(m)
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return (a[i] & (0x100 - (1 << (8 - m)))) - (b[i] & (0x100 - (1 << (8 - m))));
return 0;
}
void mask(void *va, int masklen, int len)
{
int i;
char *a = va;
cp
i = masklen / 8;
masklen %= 8;
if(masklen)
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a[i++] &= (0x100 - (1 << masklen));
for(; i < len; i++)
a[i] = 0;
}
void maskcpy(void *va, void *vb, int masklen, int len)
{
int i, m;
char *a = va;
char *b = vb;
cp
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for(m = masklen, i = 0; m >= 8; m -= 8, i++)
a[i] = b[i];
if(m)
{
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a[i] = b[i] & (0x100 - (1 << m));
i++;
}
for(; i < len; i++)
a[i] = 0;
}
int maskcheck(void *va, int masklen, int len)
{
int i;
char *a = va;
cp
i = masklen / 8;
masklen %= 8;
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if(a[i++] & (0xff >> masklen))
return -1;
for(; i < len; i++)
if(a[i] != 0)
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return -2;
return 0;
}