text: /*
   * Copyright (c) 1985, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Copyright (c) 1995 John Hay.  All rights reserved.
   *
   * This file includes significant work done at Cornell University by
   * Bill Nesheim.  That work included by permission.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD: src/usr.sbin/IPXrouted/main.c,v 1.10 1999/08/28 01:15:03 peter Exp $
   * $DragonFly: src/usr.sbin/IPXrouted/main.c,v 1.4 2007/05/18 17:05:12 dillon Exp $
   *
   * @(#) Copyright (c) 1985, 1993 The Regents of the University of California.  All rights reserved.
   * @(#)main.c	8.1 (Berkeley) 6/5/93
   */
  
  /*
   * IPX Routing Information Protocol Daemon
   */
  #include "defs.h"
  #include <sys/time.h>
  
  #include <net/if.h>
  
  #include <errno.h>
  #include <nlist.h>
  #include <signal.h>
  #include <paths.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  #define SAP_PKT		0
  #define RIP_PKT		1
  
  struct	sockaddr_ipx addr;	/* Daemon's Address */
  int	ripsock;		/* RIP Socket to listen on */
  int	sapsock;		/* SAP Socket to listen on */
  int	kmem;
  int	install;		/* if 1 call kernel */
  int	lookforinterfaces;	/* if 1 probe kernel for new up interfaces */
  int	performnlist;		/* if 1 check if /kernel has changed */
  int	externalinterfaces;	/* # of remote and local interfaces */
  int	timeval;		/* local idea of time */
  int	noteremoterequests;	/* squawk on requests from non-local nets */
  int	r;			/* Routing socket to install updates with */
  struct	sockaddr_ipx ipx_netmask;	/* Used in installing routes */
  
  char	packet[MAXRXPACKETSIZE+1];
  
  char	**argv0;
  
  int	supplier = -1;		/* process should supply updates */
  int	dosap = 1;		/* By default do SAP services. */
  int	dobcast = 1;		/* A RIP/SAP broadcast is needed. */
  time_t	lastbcast;		/* Time of last RIP/SAP broadcast */
  
  struct	rip *msg = (struct rip *) &packet[sizeof (struct ipx)]; 
  struct	sap_packet *sap_msg = 
  		(struct sap_packet *) &packet[sizeof (struct ipx)]; 
  void	hup(), fkexit(), timer();
  void	process(int fd, int pkt_type);
  int	getsocket(int type, int proto, struct sockaddr_ipx *sipx);
  void	getinfo();
  void	catchtimer();
  
  int
  main(int argc, char *argv[])
  {
  	int nfds;
  	fd_set fdvar;
  	time_t ttime;
  	struct itimerval tval;
  
  	argv0 = argv;
  	argv++, argc--;
  	while (argc > 0 && **argv == '-') {
  		if (strcmp(*argv, "-s") == 0) {
  			supplier = 1;
  			argv++, argc--;
  			continue;
  		}
  		if (strcmp(*argv, "-q") == 0) {
  			supplier = 0;
  			argv++, argc--;
  			continue;
  		}
  		if (strcmp(*argv, "-R") == 0) {
  			noteremoterequests++;
  			argv++, argc--;
  			continue;
  		}
  		if (strcmp(*argv, "-S") == 0) {
  			dosap = 0;
  			argv++, argc--;
  			continue;
  		}
  		if (strcmp(*argv, "-t") == 0) {
  			tracepackets++;
  			argv++, argc--;
  			ftrace = stderr;
  			tracing = 1; 
  			continue;
  		}
  		if (strcmp(*argv, "-g") == 0) {
  			gateway = 1;
  			argv++, argc--;
  			continue;
  		}
  		if (strcmp(*argv, "-l") == 0) {
  			gateway = -1;
  			argv++, argc--;
  			continue;
  		}
  		if (strcmp(*argv, "-N") == 0) {
  			dognreply = 0;
  			argv++, argc--;
  			continue;
  		}
  		fprintf(stderr,
  			"usage: ipxrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ] [ -N ]\n");
  		exit(1);
  	}
  	
  	
  #ifndef DEBUG
  	if (!tracepackets)
  		daemon(0, 0);
  #endif
  	openlog("IPXrouted", LOG_PID, LOG_DAEMON);
  
  	addr.sipx_family = AF_IPX;
  	addr.sipx_len = sizeof(addr);
  	addr.sipx_port = htons(IPXPORT_RIP);
  	ipx_anynet.s_net[0] = ipx_anynet.s_net[1] = -1;
  	ipx_netmask.sipx_addr.x_net = ipx_anynet;
  	ipx_netmask.sipx_len = 6;
  	ipx_netmask.sipx_family = AF_IPX;
  	r = socket(AF_ROUTE, SOCK_RAW, 0);
  	/* later, get smart about lookingforinterfaces */
  	if (r)
  		shutdown(r, SHUT_RD); /* for now, don't want reponses */
  	else {
  		fprintf(stderr, "IPXrouted: no routing socket\n");
  		exit(1);
  	}
  	ripsock = getsocket(SOCK_DGRAM, 0, &addr);
  	if (ripsock < 0)
  		exit(1);
  
  	if (dosap) {
  		addr.sipx_port = htons(IPXPORT_SAP);
  		sapsock = getsocket(SOCK_DGRAM, 0, &addr);
  		if (sapsock < 0)
  			exit(1);
  	} else
  		sapsock = -1;
  
  	/*
  	 * Any extra argument is considered
  	 * a tracing log file.
  	 */
  	if (argc > 0)
  		traceon(*argv);
  	/*
  	 * Collect an initial view of the world by
  	 * snooping in the kernel.  Then, send a request packet on all
  	 * directly connected networks to find out what
  	 * everyone else thinks.
  	 */
  	rtinit();
  	sapinit();
  	ifinit();
  	if (supplier < 0)
  		supplier = 0;
  	/* request the state of the world */
  	msg->rip_cmd = htons(RIPCMD_REQUEST);
  	msg->rip_nets[0].rip_dst = ipx_anynet;
  	msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
  	msg->rip_nets[0].rip_ticks =  htons(-1);
  	toall(sndmsg, NULL, 0);
  
  	if (dosap) {
  		sap_msg->sap_cmd = htons(SAP_REQ);
  		sap_msg->sap[0].ServType = htons(SAP_WILDCARD);
  		toall(sapsndmsg, NULL, 0);
  	}
  
  	signal(SIGALRM, catchtimer);
  	signal(SIGHUP, hup);
  	signal(SIGINT, hup);
  	signal(SIGEMT, fkexit);
  	signal(SIGINFO, getinfo);
   
  	tval.it_interval.tv_sec = TIMER_RATE;
  	tval.it_interval.tv_usec = 0;
  	tval.it_value.tv_sec = TIMER_RATE;
  	tval.it_value.tv_usec = 0;
  	setitimer(ITIMER_REAL, &tval, NULL);
  
  	nfds = 1 + max(sapsock, ripsock);
  
  	for (;;) {
  		if (dobcast) {
  			dobcast = 0;
  			lastbcast = time(NULL);
  			timer();
  		}
  
  		FD_ZERO(&fdvar);
  		if (dosap) {
  			FD_SET(sapsock, &fdvar);
  		}
  		FD_SET(ripsock, &fdvar);
  
  		if(select(nfds, &fdvar, NULL, NULL, NULL) < 0) {
  			if(errno == EINTR)
  				continue;
  			perror("during select");
  			exit(1);
  		}
  
  		if(FD_ISSET(ripsock, &fdvar))
  			process(ripsock, RIP_PKT);
  
  		if(dosap && FD_ISSET(sapsock, &fdvar))
  			process(sapsock, SAP_PKT);
  
  		ttime = time(NULL);
  		if (ttime > (lastbcast + TIMER_RATE + (TIMER_RATE * 2 / 3))) {
  			dobcast = 1;
  			syslog(LOG_ERR, "Missed alarm");
  		}
  	}
  }
  
  void
  process(int fd, int pkt_type)
  {
  	struct sockaddr from;
  	int fromlen = sizeof (from), cc, omask;
  	struct ipx *ipxdp = (struct ipx *)packet;
  
  	cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
  	if (cc <= 0) {
  		if (cc < 0 && errno != EINTR)
  			syslog(LOG_ERR, "recvfrom: %m");
  		return;
  	}
  	if (tracepackets > 1 && ftrace) {
  	    fprintf(ftrace,"rcv %d bytes on %s ", 
  		    cc, ipxdp_ntoa(&ipxdp->ipx_dna));
  	    fprintf(ftrace," from %s\n", ipxdp_ntoa(&ipxdp->ipx_sna));
  	}
  	
  	if (noteremoterequests && 
  	    !ipx_neteqnn(ipxdp->ipx_sna.x_net, ipx_zeronet) &&
  	    !ipx_neteq(ipxdp->ipx_sna, ipxdp->ipx_dna))
  	{
  		syslog(LOG_ERR,
  		       "net of interface (%s) != net on ether (%s)!\n",
  		       ipxdp_nettoa(ipxdp->ipx_dna.x_net),
  		       ipxdp_nettoa(ipxdp->ipx_sna.x_net));
  	}
  			
  	/* We get the IPX header in front of the RIF packet*/
  	cc -= sizeof (struct ipx);
  #define	mask(s)	(1<<((s)-1))
  	omask = sigblock(mask(SIGALRM));
  	switch(pkt_type) {
  		case SAP_PKT: sap_input(&from, cc);
  				break;
  		case RIP_PKT: rip_input(&from, cc);
  				break;
  	}
  	sigsetmask(omask);
  }
  
  int
  getsocket(int type, int proto, struct sockaddr_ipx *sipx)
  {
  	int domain = sipx->sipx_family;
  	int retry, s, on = 1;
  
  	retry = 1;
  	while ((s = socket(domain, type, proto)) < 0 && retry) {
  		syslog(LOG_ERR, "socket: %m");
  		sleep(5 * retry);
  		retry <<= 1;
  	}
  	if (retry == 0)
  		return (-1);
  	while (bind(s, (struct sockaddr *)sipx, sizeof (*sipx)) < 0 && retry) {
  		syslog(LOG_ERR, "bind: %m");
  		sleep(5 * retry);
  		retry <<= 1;
  	}
  	if (retry == 0)
  		return (-1);
  	if (domain==AF_IPX) {
  		struct ipx ipxdp;
  		if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
  			syslog(LOG_ERR, "setsockopt SEE HEADERS: %m");
  			exit(1);
  		}
  		if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP)
  			ipxdp.ipx_pt = IPXPROTO_RI;
  		else if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_SAP)
  #ifdef IPXPROTO_SAP
  			ipxdp.ipx_pt = IPXPROTO_SAP;
  #else
  			ipxdp.ipx_pt = IPXPROTO_PXP;
  #endif
  		else {
  			syslog(LOG_ERR, "port should be either RIP or SAP");
  			exit(1);
  		}
  		if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &ipxdp, sizeof(ipxdp))) {
  			syslog(LOG_ERR, "setsockopt SET HEADER: %m");
  			exit(1);
  		}
  	}
  	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
  		syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
  		exit(1);
  	}
  	return (s);
  }
  
  /*
   * Fork and exit on EMT-- for profiling.
   */
  void
  fkexit(void)
  {
  	if (fork() == 0)
  		exit(0);
  }
  
  void
  catchtimer(void)
  {
  	dobcast = 1;
  }
  
  void
  getinfo(void)
  {
  	FILE *fh;
  
  	fh = fopen("/var/log/ipxrouted.dmp", "a");
  	if(fh == NULL)
  		return;
  
  	dumpriptable(fh);
  	dumpsaptable(fh, sap_head);
  
  	fclose(fh);
  }
  
  