tinc/src/netutl.c

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/*
netutl.c -- some supporting network utility code
Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com>
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.
*/
#include "config.h"
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <syslog.h>
#include <utils.h>
#include <xalloc.h>
#include "encr.h"
#include "net.h"
#include "netutl.h"
/*
look for a connection associated with the given vpn ip,
return its connection structure
*/
conn_list_t *lookup_conn(ip_t ip)
{
conn_list_t *p = conn_list;
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/* Exact match suggested by James B. MacLean */
for(p = conn_list; p != NULL; p = p->next)
if(ip == p->vpn_ip)
return p;
for(p = conn_list; p != NULL; p = p->next)
if((ip & p->vpn_mask) == (p->vpn_ip & p->vpn_mask))
return p;
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return NULL;
}
/*
free a queue and all of its elements
*/
void destroy_queue(packet_queue_t *pq)
{
queue_element_t *p, *q;
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for(p = pq->head; p != NULL; p = q)
{
q = p->next;
if(p->packet)
free(p->packet);
free(p);
}
free(pq);
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}
/*
free a conn_list_t element and all its pointers
*/
void free_conn_element(conn_list_t *p)
{
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if(p->hostname)
free(p->hostname);
if(p->sq)
destroy_queue(p->sq);
if(p->rq)
destroy_queue(p->rq);
free_key(p->public_key);
free_key(p->key);
free(p);
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}
/*
remove all marked connections
*/
void prune_conn_list(void)
{
conn_list_t *p, *prev = NULL, *next = NULL;
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for(p = conn_list; p != NULL; )
{
next = p->next;
if(p->status.remove)
{
if(prev)
prev->next = next;
else
conn_list = next;
free_conn_element(p);
}
else
prev = p;
p = next;
}
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}
/*
creates new conn_list element, and initializes it
*/
conn_list_t *new_conn_list(void)
{
conn_list_t *p = xmalloc(sizeof(*p));
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/* initialise all those stupid pointers at once */
memset(p, '\0', sizeof(*p));
p->vpn_mask = (ip_t)(~0L); /* If this isn't done, it would be a
wastebucket for all packets with
unknown destination. */
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p->nexthop = p;
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return p;
}
/*
free all elements of conn_list
*/
void destroy_conn_list(void)
{
conn_list_t *p, *next;
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for(p = conn_list; p != NULL; )
{
next = p->next;
free_conn_element(p);
p = next;
}
conn_list = NULL;
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}
/*
look up the name associated with the ip
address `addr'
*/
char *hostlookup(unsigned long addr)
{
char *name;
struct hostent *host = NULL;
struct in_addr in;
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in.s_addr = addr;
host = gethostbyaddr((char *)&in, sizeof(in), AF_INET);
if(host)
{
name = xmalloc(strlen(host->h_name)+20);
sprintf(name, "%s (%s)", host->h_name, inet_ntoa(in));
}
else
{
name = xmalloc(20);
sprintf(name, "%s", inet_ntoa(in));
}
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return name;
}
/*
Turn a string into an IP addy with netmask
return NULL on failure
*/
ip_mask_t *strtoip(char *str)
{
ip_mask_t *ip;
int masker;
char *q, *p;
struct hostent *h;
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p = str;
if((q = strchr(p, '/')))
{
*q = '\0';
q++; /* q now points to netmask part, or NULL if no mask */
}
if(!(h = gethostbyname(p)))
{
fprintf(stderr, "Error looking up `%s': %s\n", p, sys_errlist[h_errno]);
return NULL;
}
masker = 0;
if(q)
{
masker = strtol(q, &p, 10);
if(q == p || (*p))
return NULL;
}
ip = xmalloc(sizeof(*ip));
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ip->ip = ntohl(*((ip_t*)(h->h_addr_list[0])));
ip->mask = masker ? ~((1 << (32 - masker)) - 1) : 0;
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return ip;
}
void dump_conn_list(void)
{
conn_list_t *p;
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syslog(LOG_DEBUG, "Connection list:");
for(p = conn_list; p != NULL; p = p->next)
{
syslog(LOG_DEBUG, " " IP_ADDR_S "/" IP_ADDR_S ": %04x (%d|%d)",
IP_ADDR_V(p->vpn_ip), IP_ADDR_V(p->vpn_mask), p->status,
p->socket, p->meta_socket);
}
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}