From: Sam Leffler <sam@ucbvax.Berkeley.EDU>
Date: Wed, 3 Nov 1982 14:28:04 +0000 (-0800)
Subject: date and time created 82/11/02 22:28:04 by sam
X-Git-Tag: BSD-4_1c_2-Snapshot-Development~1949
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/fdd0ed12d24b6399846acbe6a3beb97b174c0662

date and time created 82/11/02 22:28:04 by sam

SCCS-vsn: sbin/routed/main.c 4.1
---

diff --git a/usr/src/sbin/routed/main.c b/usr/src/sbin/routed/main.c
new file mode 100644
index 0000000000..263e9e5862
--- /dev/null
+++ b/usr/src/sbin/routed/main.c
@@ -0,0 +1,149 @@
+#ifndef lint
+static char sccsid[] = "@(#)main.c	4.1 %G%";
+#endif
+
+/*
+ * Routing Table Management Daemon
+ */
+#include "router.h"
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <errno.h>
+#include <nlist.h>
+#include <signal.h>
+#include <time.h>
+
+int	supplier = -1;		/* process should supply updates */
+
+struct	rip *msg = (struct rip *)packet;
+
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	int cc;
+	struct sockaddr from;
+	
+	argv0 = argv;
+#ifndef DEBUG
+	if (fork())
+		exit(0);
+	for (cc = 0; cc < 10; cc++)
+		(void) close(cc);
+	(void) open("/", 0);
+	(void) dup2(0, 1);
+	(void) dup2(0, 2);
+	{ int t = open("/dev/tty", 2);
+	  if (t >= 0) {
+		ioctl(t, TIOCNOTTY, (char *)0);
+		(void) close(t);
+	  }
+	}
+#endif
+	if (tracing)
+		traceon("/etc/routerlog");
+
+	/*
+	 * We use two sockets.  One for which outgoing
+	 * packets are routed and for which they're not.
+	 * The latter allows us to delete routing table
+	 * entries in the kernel for network interfaces
+	 * attached to our host which we believe are down
+	 * while still polling it to see when/if it comes
+	 * back up.  With the new ipc interface we'll be
+	 * able to specify ``don't route'' as an option
+	 * to send, but until then we utilize a second port.
+	 */
+	sp = getservbyname("router", "udp");
+	if (sp == 0) {
+		fprintf(stderr, "routed: udp/router: unknown service\n");
+		exit(1);
+	}
+	routingaddr.sin_family = AF_INET;
+	routingaddr.sin_port = htons(sp->s_port);
+	noroutingaddr.sin_family = AF_INET;
+	noroutingaddr.sin_port = htons(sp->s_port + 1);
+again:
+	s = socket(SOCK_DGRAM, 0, &routingaddr, 0);
+	if (s < 0) {
+		perror("socket");
+		sleep(30);
+		goto again;
+	}
+again2:
+	snoroute = socket(SOCK_DGRAM, 0, &noroutingaddr, SO_DONTROUTE);
+	if (snoroute < 0) {
+		perror("socket");
+		sleep(30);
+		goto again2;
+	}
+	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;
+		}
+		goto usage;
+	}
+	if (argc > 0) {
+usage:
+		fprintf(stderr, "usage: routed [ -s ] [ -q ]\n");
+		exit(1);
+	}
+	/*
+	 * Collect an initial view of the world by
+	 * snooping in the kernel and the gateway kludge
+	 * file.  Then, send a request packet on all
+	 * directly connected networks to find out what
+	 * everyone else thinks.
+	 */
+	rtinit();
+	gwkludge();
+	ifinit();
+	if (supplier < 0)
+		supplier = 0;
+	msg->rip_cmd = RIPCMD_REQUEST;
+	msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC;
+	msg->rip_nets[0].rip_metric = HOPCNT_INFINITY;
+	toall(sendmsg);
+	sigset(SIGALRM, timer);
+	timer();
+
+#define	INFINITY	1000000
+	for (;;) {
+		int ibits;
+		register int n;
+
+		ibits = (1 << s) | (1 << snoroute);
+		n = select(32, &ibits, 0, INFINITY);
+		if (n < 0)
+			continue;
+		if (ibits & (1 << s))
+			process(s);
+		if (ibits & (1 << snoroute))
+			process(snoroute);
+	}
+}
+
+process(fd)
+	int fd;
+{
+	register int cc;
+	struct sockaddr from;
+
+	cc = receive(fd, &from, packet, sizeof (packet));
+	if (cc <= 0) {
+		if (cc < 0 && errno != EINTR)
+			perror("receive");
+		return;
+	}
+	sighold(SIGALRM);
+	rip_input(&from, cc);
+	sigrelse(SIGALRM);
+}