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/*
* dnroute.c DECnet routing daemon (eventually...)
*
* 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.
*
* Authors: Patrick Caulfield <patrick@ChyGwyn.com>
* based on rtmon.c by Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/in.h>
#include <string.h>
#include <linux/netfilter_decnet.h>
#include <netdnet/dnetdb.h>
#include "libnetlink.h"
#include "dnrtlink.h"
#include "utils.h"
#include "csum.h"
int routing_multicast_timer = 15;
extern void send_route_msg(int);
char *if_index_to_name(int ifindex)
{
struct ifreq ifr;
static char buf[64];
int sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
ifr.ifr_ifindex = ifindex;
if (ioctl(sock, SIOCGIFNAME, &ifr) == 0)
{
strcpy(buf, ifr.ifr_name);
}
else
{
sprintf(buf, "if%d", ifindex);
}
close(sock);
return buf;
}
/* Dump a routing message to stdout */
static int dump_msg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
struct nf_dn_rtmsg *rtm;
unsigned short *ptr2;
unsigned char *ptr1;
int len, i;
unsigned int sum=1;
rtm = (struct nf_dn_rtmsg *)NLMSG_DATA(n);
ptr2 = (unsigned short *)NFDN_RTMSG(rtm);
ptr1 = (unsigned char *)NFDN_RTMSG(rtm);
len = n->nlmsg_len - sizeof(*n) - sizeof(*rtm);
#ifdef DUMP_PACKET
for (i=0; i<len/2; i++)
{
if (!(i&0xf)) fprintf(stderr, "\n");
fprintf(stderr, "%04x ", *(ptr2+i));
}
fprintf(stderr, "\n");
#endif
/* Level 1 Routing Message */
if ( (ptr1[0] & 0xE)>>1 == 3)
{
struct dn_naddr add;
char node[32];
int num;
int num_ids;
int start_id;
int entry;
i = 4; /* Start of segments */
add.a_len = 2;
add.a_addr[0] = ptr1[1];
add.a_addr[1] = ptr1[2];
dnet_ntop(AF_DECnet, &add, node, sizeof(node));
printf("Level 1 routing message from %s on %s, len = %d\n",
node, if_index_to_name(rtm->nfdn_ifindex), len);
while (i < len-4)
{
num_ids = ptr1[i] | ptr1[i+1]<<8;
i+=2;
start_id = ptr1[i] | ptr1[i+1]<<8;
i+=2; /* Start of entries */
for (num = 0; num<num_ids; num++)
{
entry = ptr1[i] | ptr1[i+1]<<8;
if (entry != 0x7fff)
{
printf(" Node %d reachable. Hops %d, cost %d\n",
num+start_id, (entry&0x7E00)>>9, entry&0x1FF);
}
i+=2;
}
}
}
/* Level 2 Routing Message */
if ( (ptr1[0] & 0xE)>>1 == 4)
{
struct dn_naddr add;
char node[32];
int num;
int num_ids;
int start_id;
int entry;
i = 4; /* Start of segments */
add.a_len = 2;
add.a_addr[0] = ptr1[1];
add.a_addr[1] = ptr1[2];
dnet_ntop(AF_DECnet, &add, node, sizeof(node));
printf("Level 2 routing message from %s on %s, len = %d\n",
node, if_index_to_name(rtm->nfdn_ifindex), len);
while (i < len-4)
{
num_ids = ptr1[i] | ptr1[i+1]<<8;
i+=2;
start_id = ptr1[i] | ptr1[i+1]<<8;
i+=2; /* Start of entries */
for (num = 0; num<num_ids; num++)
{
entry = ptr1[i] | ptr1[i+1]<<8;
if (entry != 0x7fff)
{
printf(" Area %d reachable. Hops %d, cost %d\n",
num+start_id, (entry&0x7E00)>>9, entry&0x1FF);
}
i+=2;
}
}
}
/* Check the checksum */
sum = route_csum(ptr1, 4, i);
printf("Calc sum=%x, got sum: %x\n", sum, *(unsigned short *)(ptr1+i));
return 0;
}
int
main(int argc, char **argv)
{
struct rtnl_handle rth;
unsigned groups = DNRMG_L1_GROUP | DNRMG_L2_GROUP;
signal(SIGALRM, send_route_msg);
alarm(routing_multicast_timer);
if (dnrt_open(&rth, groups) < 0)
exit(1);
if (dnrt_listen(&rth, dump_msg, (void*)0) < 0)
exit(2);
exit(0);
}
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