[unix-history] / usr / src / sbin / routed / startup.c

#ifndef lint
static char sccsid[] = "@(#)startup.c	4.6 (Berkeley) %G%";
#endif

/*
 * Routing Table Management Daemon
 */
#include "defs.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <nlist.h>

struct	interface *ifnet;
int	kmem = -1;
int	lookforinterfaces = 1;
int	performnlist = 1;
int	externalinterfaces = 0;		/* # of remote and local interfaces */
int	gateway = 0;		/* 1 if we are a gateway to parts beyond */

struct nlist nl[] = {
#define	N_IFNET		0
	{ "_ifnet" },
	{ "" },
};

/*
 * Probe the kernel through /dev/kmem to find the network
 * interfaces which have configured themselves.  If the
 * interface is present but not yet up (for example an
 * ARPANET IMP), set the lookforinterfaces flag so we'll
 * come back later and look again.
 */
ifinit()
{
	struct interface *ifp;
	struct ifnet ifs, *next;
	char name[32], *cp, *index();

	if (performnlist) {
		nlist("/vmunix", nl);
		if (nl[N_IFNET].n_value == 0) {
			printf("ifnet: not in namelist\n");
			goto bad;
		}
		performnlist = 0;
		if (gateway > 0)
			rtdefault();
	}
	if (kmem < 0) {
		kmem = open("/dev/kmem", 0);
		if (kmem < 0) {
			perror("/dev/kmem");
			goto bad;
		}
	}
	if (lseek(kmem, (long)nl[N_IFNET].n_value, 0) == -1 ||
	    read(kmem, (char *)&next, sizeof (next)) != sizeof (next)) {
		printf("ifnet: error reading kmem\n");
		goto bad;
	}
	lookforinterfaces = 0;
	while (next) {
		if (lseek(kmem, (long)next, 0) == -1 ||
		    read(kmem, (char *)&ifs, sizeof (ifs)) != sizeof (ifs)) {
			perror("read");
			goto bad;
		}
		next = ifs.if_next;
		if ((ifs.if_flags & IFF_UP) == 0) {
			lookforinterfaces = 1;
			continue;
		}
		/* already known to us? */
		if (if_ifwithaddr(&ifs.if_addr))
			continue;
		/* argh, this'll have to change sometime */
		if (ifs.if_addr.sa_family != AF_INET)
			continue;
		/* no one cares about software loopback interfaces */
		if (ifs.if_net == LOOPBACKNET)
			continue;
		ifp = (struct interface *)malloc(sizeof (struct interface));
		if (ifp == 0) {
			printf("routed: out of memory\n");
			break;
		}
		/*
		 * Count the # of directly connected networks
		 * and point to point links which aren't looped
		 * back to ourself.  This is used below to
		 * decide if we should be a routing ``supplier''.
		 */
		if ((ifs.if_flags & IFF_POINTOPOINT) == 0 ||
		    if_ifwithaddr(&ifs.if_dstaddr) == 0)
			externalinterfaces++;
		if ((ifs.if_flags & IFF_LOCAL) == 0 && gateway == 0) {
			/*
			 * If we have an interface to a non-local network,
			 * we are a candidate for use as a gateway.
			 */
			gateway = 1;
			rtdefault();
		}
		lseek(kmem, ifs.if_name, 0);
		read(kmem, name, sizeof (name));
		name[sizeof (name) - 1] = '\0';
		cp = index(name, '\0');
		*cp++ = ifs.if_unit + '0';
		*cp = '\0';
		ifp->int_name = malloc(strlen(name) + 1);
		if (ifp->int_name == 0) {
			fprintf(stderr, "routed: ifinit: out of memory\n");
			goto bad;		/* ??? */
		}
		strcpy(ifp->int_name, name);
		ifp->int_addr = ifs.if_addr;
		ifp->int_flags = ifs.if_flags | IFF_INTERFACE;
		/* this works because broadaddr overlaps dstaddr */
		ifp->int_broadaddr = ifs.if_broadaddr;
		ifp->int_net = ifs.if_net;
		ifp->int_metric = 0;
		ifp->int_next = ifnet;
		ifnet = ifp;
		traceinit(ifp);
		addrouteforif(ifp);
	}
	if (externalinterfaces > 1 && supplier < 0)
		supplier = 1;
	return;
bad:
	sleep(60);
	close(kmem), close(s);
	execv("/etc/routed", argv0);
	_exit(0177);
}

addrouteforif(ifp)
	struct interface *ifp;
{
	struct sockaddr_in net;
	struct sockaddr *dst;
	int state, metric;
	struct rt_entry *rt;

	if (ifp->int_flags & IFF_POINTOPOINT)
		dst = &ifp->int_dstaddr;
	else {
		bzero((char *)&net, sizeof (net));
		net.sin_family = AF_INET;
		net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
		dst = (struct sockaddr *)&net;
	}
	rt = rtlookup(dst);
	rtadd(dst, &ifp->int_addr, ifp->int_metric,
		ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE));
	if (rt)
		rtdelete(rt);
}

/*
 * As a concession to the ARPANET we read a list of gateways
 * from /etc/gateways and add them to our tables.  This file
 * exists at each ARPANET gateway and indicates a set of ``remote''
 * gateways (i.e. a gateway which we can't immediately determine
 * if it's present or not as we can do for those directly connected
 * at the hardware level).  If a gateway is marked ``passive''
 * in the file, then we assume it doesn't have a routing process
 * of our design and simply assume it's always present.  Those
 * not marked passive are treated as if they were directly
 * connected -- they're added into the interface list so we'll
 * send them routing updates.
 */
gwkludge()
{
	struct sockaddr_in dst, gate;
	FILE *fp;
	char *type, *dname, *gname, *qual, buf[BUFSIZ];
	struct interface *ifp;
	int metric;
	struct rt_entry route;

	fp = fopen("/etc/gateways", "r");
	if (fp == NULL)
		return;
	qual = buf;
	dname = buf + 64;
	gname = buf + ((BUFSIZ - 64) / 3);
	type = buf + (((BUFSIZ - 64) * 2) / 3);
	bzero((char *)&dst, sizeof (dst));
	bzero((char *)&gate, sizeof (gate));
	bzero((char *)&route, sizeof(route));
	/* format: {net | host} XX gateway XX metric DD [passive]\n */
#define	readentry(fp) \
	fscanf((fp), "%s %s gateway %s metric %d %s\n", \
		type, dname, gname, &metric, qual)
	for (;;) {
		if (readentry(fp) == EOF)
			break;
		if (!getnetorhostname(type, dname, &dst))
			continue;
		if (!gethostnameornumber(gname, &gate))
			continue;
		if (strcmp(qual, "passive") == 0) {
			/*
			 * Passive entries aren't placed in our tables,
			 * only the kernel's, so we don't copy all of the
			 * external routing information within a net.
			 * Internal machines should use the default
			 * route to a suitable gateway (like us).
			 */
			route.rt_dst = *(struct sockaddr *) &dst;
			route.rt_router = *(struct sockaddr *) &gate;
			route.rt_flags = RTF_UP;
			if (strcmp(type, "host") == 0)
				route.rt_flags |= RTF_HOST;
			if (metric)
				route.rt_flags |= RTF_GATEWAY;
			(void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt);
			continue;
		}
		/* assume no duplicate entries */
		externalinterfaces++;
		ifp = (struct interface *)malloc(sizeof (*ifp));
		bzero((char *)ifp, sizeof (*ifp));
		ifp->int_flags = IFF_REMOTE;
		/* can't identify broadcast capability */
		ifp->int_net = inet_netof(dst.sin_addr);
		if (strcmp(type, "host") == 0) {
			ifp->int_flags |= IFF_POINTOPOINT;
			ifp->int_dstaddr = *((struct sockaddr *)&dst);
		}
		ifp->int_addr = *((struct sockaddr *)&gate);
		ifp->int_metric = metric;
		ifp->int_next = ifnet;
		ifnet = ifp;
		addrouteforif(ifp);
	}
	fclose(fp);
}

getnetorhostname(type, name, sin)
	char *type, *name;
	struct sockaddr_in *sin;
{

	if (strcmp(type, "net") == 0) {
		struct netent *np = getnetbyname(name);
		int n;

		if (np == 0)
			n = inet_network(name);
		else {
			if (np->n_addrtype != AF_INET)
				return (0);
			n = np->n_net;
		}
		sin->sin_family = AF_INET;
		sin->sin_addr = inet_makeaddr(n, INADDR_ANY);
		return (1);
	}
	if (strcmp(type, "host") == 0) {
		struct hostent *hp = gethostbyname(name);

		if (hp == 0)
			sin->sin_addr.s_addr = inet_addr(name);
		else {
			if (hp->h_addrtype != AF_INET)
				return (0);
			bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
		}
		sin->sin_family = AF_INET;
		return (1);
	}
	return (0);
}

gethostnameornumber(name, sin)
	char *name;
	struct sockaddr_in *sin;
{
	struct hostent *hp;

	hp = gethostbyname(name);
	if (hp) {
		bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
		sin->sin_family = hp->h_addrtype;
		return (1);
	}
	sin->sin_addr.s_addr = inet_addr(name);
	sin->sin_family = AF_INET;
	return (sin->sin_addr.s_addr != -1);
}
Commit	Line	Data
85d8a62e	1	#ifndef lint
f804e046	2	static char sccsid[] = "@(#)startup.c 4.6 (Berkeley) %G%";
85d8a62e SL	3	#endif
	4
	5	/*
	6	* Routing Table Management Daemon
	7	*/
7fe7fe74	8	#include "defs.h"
ad34083f	9	#include <sys/ioctl.h>
85d8a62e SL	10	#include <net/if.h>
	11	#include <nlist.h>
	12
	13	struct interface *ifnet;
	14	int kmem = -1;
	15	int lookforinterfaces = 1;
	16	int performnlist = 1;
	17	int externalinterfaces = 0; /* # of remote and local interfaces */
ad34083f	18	int gateway = 0; /* 1 if we are a gateway to parts beyond */
85d8a62e SL	19
	20	struct nlist nl[] = {
	21	#define N_IFNET 0
	22	{ "_ifnet" },
7fe7fe74	23	{ "" },
85d8a62e SL	24	};
	25
	26	/*
	27	* Probe the kernel through /dev/kmem to find the network
	28	* interfaces which have configured themselves. If the
	29	* interface is present but not yet up (for example an
	30	* ARPANET IMP), set the lookforinterfaces flag so we'll
	31	* come back later and look again.
	32	*/
	33	ifinit()
	34	{
	35	struct interface *ifp;
	36	struct ifnet ifs, *next;
	37	char name[32], cp, index();
	38
	39	if (performnlist) {
	40	nlist("/vmunix", nl);
	41	if (nl[N_IFNET].n_value == 0) {
	42	printf("ifnet: not in namelist\n");
	43	goto bad;
	44	}
	45	performnlist = 0;
f804e046	46	if (gateway > 0)
ad34083f	47	rtdefault();
85d8a62e SL	48	}
	49	if (kmem < 0) {
	50	kmem = open("/dev/kmem", 0);
	51	if (kmem < 0) {
	52	perror("/dev/kmem");
	53	goto bad;
	54	}
	55	}
	56	if (lseek(kmem, (long)nl[N_IFNET].n_value, 0) == -1 \|\|
	57	read(kmem, (char *)&next, sizeof (next)) != sizeof (next)) {
	58	printf("ifnet: error reading kmem\n");
	59	goto bad;
	60	}
	61	lookforinterfaces = 0;
	62	while (next) {
	63	if (lseek(kmem, (long)next, 0) == -1 \|\|
	64	read(kmem, (char *)&ifs, sizeof (ifs)) != sizeof (ifs)) {
	65	perror("read");
	66	goto bad;
	67	}
	68	next = ifs.if_next;
	69	if ((ifs.if_flags & IFF_UP) == 0) {
	70	lookforinterfaces = 1;
	71	continue;
	72	}
	73	/* already known to us? */
	74	if (if_ifwithaddr(&ifs.if_addr))
	75	continue;
	76	/* argh, this'll have to change sometime */
	77	if (ifs.if_addr.sa_family != AF_INET)
	78	continue;
	79	/* no one cares about software loopback interfaces */
	80	if (ifs.if_net == LOOPBACKNET)
	81	continue;
	82	ifp = (struct interface *)malloc(sizeof (struct interface));
	83	if (ifp == 0) {
	84	printf("routed: out of memory\n");
	85	break;
	86	}
	87	/*
	88	* Count the # of directly connected networks
	89	* and point to point links which aren't looped
	90	* back to ourself. This is used below to
	91	* decide if we should be a routing ``supplier''.
	92	*/
	93	if ((ifs.if_flags & IFF_POINTOPOINT) == 0 \|\|
	94	if_ifwithaddr(&ifs.if_dstaddr) == 0)
	95	externalinterfaces++;
ad34083f MK	96	if ((ifs.if_flags & IFF_LOCAL) == 0 && gateway == 0) {
	97	/*
	98	* If we have an interface to a non-local network,
	99	* we are a candidate for use as a gateway.
	100	*/
	101	gateway = 1;
	102	rtdefault();
	103	}
85d8a62e SL	104	lseek(kmem, ifs.if_name, 0);
	105	read(kmem, name, sizeof (name));
	106	name[sizeof (name) - 1] = '\0';
	107	cp = index(name, '\0');
	108	*cp++ = ifs.if_unit + '0';
	109	*cp = '\0';
	110	ifp->int_name = malloc(strlen(name) + 1);
	111	if (ifp->int_name == 0) {
	112	fprintf(stderr, "routed: ifinit: out of memory\n");
	113	goto bad; /* ??? */
	114	}
	115	strcpy(ifp->int_name, name);
	116	ifp->int_addr = ifs.if_addr;
	117	ifp->int_flags = ifs.if_flags \| IFF_INTERFACE;
	118	/* this works because broadaddr overlaps dstaddr */
	119	ifp->int_broadaddr = ifs.if_broadaddr;
	120	ifp->int_net = ifs.if_net;
	121	ifp->int_metric = 0;
	122	ifp->int_next = ifnet;
	123	ifnet = ifp;
	124	traceinit(ifp);
	125	addrouteforif(ifp);
	126	}
	127	if (externalinterfaces > 1 && supplier < 0)
	128	supplier = 1;
	129	return;
	130	bad:
	131	sleep(60);
7fe7fe74	132	close(kmem), close(s);
85d8a62e SL	133	execv("/etc/routed", argv0);
	134	_exit(0177);
	135	}
	136
	137	addrouteforif(ifp)
	138	struct interface *ifp;
	139	{
	140	struct sockaddr_in net;
	141	struct sockaddr *dst;
	142	int state, metric;
	143	struct rt_entry *rt;
	144
	145	if (ifp->int_flags & IFF_POINTOPOINT)
	146	dst = &ifp->int_dstaddr;
	147	else {
	148	bzero((char *)&net, sizeof (net));
	149	net.sin_family = AF_INET;
	150	net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
	151	dst = (struct sockaddr *)&net;
	152	}
	153	rt = rtlookup(dst);
	154	rtadd(dst, &ifp->int_addr, ifp->int_metric,
	155	ifp->int_flags & (IFF_INTERFACE\|IFF_PASSIVE\|IFF_REMOTE));
	156	if (rt)
	157	rtdelete(rt);
	158	}
	159
	160	/*
	161	* As a concession to the ARPANET we read a list of gateways
	162	* from /etc/gateways and add them to our tables. This file
	163	* exists at each ARPANET gateway and indicates a set of ``remote''
	164	* gateways (i.e. a gateway which we can't immediately determine
	165	* if it's present or not as we can do for those directly connected
	166	* at the hardware level). If a gateway is marked ``passive''
	167	* in the file, then we assume it doesn't have a routing process
	168	* of our design and simply assume it's always present. Those
	169	* not marked passive are treated as if they were directly
	170	* connected -- they're added into the interface list so we'll
	171	* send them routing updates.
	172	*/
	173	gwkludge()
	174	{
	175	struct sockaddr_in dst, gate;
	176	FILE *fp;
	177	char type, dname, gname, qual, buf[BUFSIZ];
	178	struct interface *ifp;
	179	int metric;
ad34083f	180	struct rt_entry route;
85d8a62e SL	181
	182	fp = fopen("/etc/gateways", "r");
	183	if (fp == NULL)
	184	return;
	185	qual = buf;
	186	dname = buf + 64;
	187	gname = buf + ((BUFSIZ - 64) / 3);
	188	type = buf + (((BUFSIZ - 64) * 2) / 3);
	189	bzero((char *)&dst, sizeof (dst));
	190	bzero((char *)&gate, sizeof (gate));
ad34083f	191	bzero((char *)&route, sizeof(route));
85d8a62e SL	192	/* format: {net \| host} XX gateway XX metric DD [passive]\n */
	193	#define readentry(fp) \
	194	fscanf((fp), "%s %s gateway %s metric %d %s\n", \
	195	type, dname, gname, &metric, qual)
	196	for (;;) {
85d8a62e SL	197	if (readentry(fp) == EOF)
85d8a62e SL	198	break;
7fe7fe74	199	if (!getnetorhostname(type, dname, &dst))
85d8a62e	200	continue;
7fe7fe74	201	if (!gethostnameornumber(gname, &gate))
85d8a62e	202	continue;
ad34083f MK	203	if (strcmp(qual, "passive") == 0) {
	204	/*
	205	* Passive entries aren't placed in our tables,
	206	* only the kernel's, so we don't copy all of the
	207	* external routing information within a net.
	208	* Internal machines should use the default
	209	* route to a suitable gateway (like us).
	210	*/
	211	route.rt_dst = (struct sockaddr ) &dst;
	212	route.rt_router = (struct sockaddr ) &gate;
	213	route.rt_flags = RTF_UP;
	214	if (strcmp(type, "host") == 0)
	215	route.rt_flags \|= RTF_HOST;
	216	if (metric)
	217	route.rt_flags \|= RTF_GATEWAY;
	218	(void) ioctl(s, SIOCADDRT, (char *)&route.rt_rt);
	219	continue;
	220	}
	221	/* assume no duplicate entries */
	222	externalinterfaces++;
85d8a62e SL	223	ifp = (struct interface )malloc(sizeof (ifp));
	224	bzero((char )ifp, sizeof (ifp));
	225	ifp->int_flags = IFF_REMOTE;
	226	/* can't identify broadcast capability */
	227	ifp->int_net = inet_netof(dst.sin_addr);
	228	if (strcmp(type, "host") == 0) {
	229	ifp->int_flags \|= IFF_POINTOPOINT;
	230	ifp->int_dstaddr = ((struct sockaddr )&dst);
	231	}
85d8a62e SL	232	ifp->int_addr = ((struct sockaddr )&gate);
	233	ifp->int_metric = metric;
	234	ifp->int_next = ifnet;
	235	ifnet = ifp;
	236	addrouteforif(ifp);
	237	}
	238	fclose(fp);
	239	}
7fe7fe74 SL	240
	241	getnetorhostname(type, name, sin)
	242	char type, name;
	243	struct sockaddr_in *sin;
	244	{
	245
	246	if (strcmp(type, "net") == 0) {
	247	struct netent *np = getnetbyname(name);
	248	int n;
	249
7fe7fe74 SL	250	if (np == 0)
7fe7fe74 SL	251	n = inet_network(name);
20932249 SL	252	else {
	253	if (np->n_addrtype != AF_INET)
	254	return (0);
7fe7fe74	255	n = np->n_net;
20932249	256	}
7fe7fe74 SL	257	sin->sin_family = AF_INET;
	258	sin->sin_addr = inet_makeaddr(n, INADDR_ANY);
	259	return (1);
	260	}
	261	if (strcmp(type, "host") == 0) {
	262	struct hostent *hp = gethostbyname(name);
	263
7fe7fe74 SL	264	if (hp == 0)
7fe7fe74 SL	265	sin->sin_addr.s_addr = inet_addr(name);
20932249 SL	266	else {
	267	if (hp->h_addrtype != AF_INET)
	268	return (0);
7fe7fe74	269	bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
20932249	270	}
7fe7fe74 SL	271	sin->sin_family = AF_INET;
	272	return (1);
	273	}
	274	return (0);
	275	}
	276
	277	gethostnameornumber(name, sin)
	278	char *name;
	279	struct sockaddr_in *sin;
	280	{
	281	struct hostent *hp;
	282
	283	hp = gethostbyname(name);
	284	if (hp) {
	285	bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
	286	sin->sin_family = hp->h_addrtype;
	287	return (1);
	288	}
	289	sin->sin_addr.s_addr = inet_addr(name);
	290	sin->sin_family = AF_INET;
	291	return (sin->sin_addr.s_addr != -1);
	292	}