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

#ifndef lint
static char sccsid[] = "@(#)startup.c	4.4 (Berkeley) 5/25/83";
#endif

/*
 * Routing Table Management Daemon
 */
#include "defs.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 */

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 (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++;
		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;

	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));
	/* 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;
		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);
		}
		if (strcmp(qual, "passive") == 0)
			ifp->int_flags |= IFF_PASSIVE;
		else
			/* assume no duplicate entries */
			externalinterfaces++;
		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
0f4556f1	2	static char sccsid[] = "@(#)startup.c 4.4 (Berkeley) 5/25/83";
85d8a62e SL	3	#endif
	4
	5	/*
	6	* Routing Table Management Daemon
	7	*/
7fe7fe74	8	#include "defs.h"
85d8a62e SL	9	#include <net/if.h>
	10	#include <nlist.h>
	11
	12	struct interface *ifnet;
	13	int kmem = -1;
	14	int lookforinterfaces = 1;
	15	int performnlist = 1;
	16	int externalinterfaces = 0; /* # of remote and local interfaces */
	17
	18	struct nlist nl[] = {
	19	#define N_IFNET 0
	20	{ "_ifnet" },
7fe7fe74	21	{ "" },
85d8a62e SL	22	};
	23
	24	/*
	25	* Probe the kernel through /dev/kmem to find the network
	26	* interfaces which have configured themselves. If the
	27	* interface is present but not yet up (for example an
	28	* ARPANET IMP), set the lookforinterfaces flag so we'll
	29	* come back later and look again.
	30	*/
	31	ifinit()
	32	{
	33	struct interface *ifp;
	34	struct ifnet ifs, *next;
	35	char name[32], cp, index();
	36
	37	if (performnlist) {
	38	nlist("/vmunix", nl);
	39	if (nl[N_IFNET].n_value == 0) {
	40	printf("ifnet: not in namelist\n");
	41	goto bad;
	42	}
	43	performnlist = 0;
	44	}
	45	if (kmem < 0) {
	46	kmem = open("/dev/kmem", 0);
	47	if (kmem < 0) {
	48	perror("/dev/kmem");
	49	goto bad;
	50	}
	51	}
	52	if (lseek(kmem, (long)nl[N_IFNET].n_value, 0) == -1 \|\|
	53	read(kmem, (char *)&next, sizeof (next)) != sizeof (next)) {
	54	printf("ifnet: error reading kmem\n");
	55	goto bad;
	56	}
	57	lookforinterfaces = 0;
	58	while (next) {
	59	if (lseek(kmem, (long)next, 0) == -1 \|\|
	60	read(kmem, (char *)&ifs, sizeof (ifs)) != sizeof (ifs)) {
	61	perror("read");
	62	goto bad;
	63	}
	64	next = ifs.if_next;
	65	if ((ifs.if_flags & IFF_UP) == 0) {
	66	lookforinterfaces = 1;
	67	continue;
	68	}
	69	/* already known to us? */
	70	if (if_ifwithaddr(&ifs.if_addr))
	71	continue;
	72	/* argh, this'll have to change sometime */
	73	if (ifs.if_addr.sa_family != AF_INET)
	74	continue;
	75	/* no one cares about software loopback interfaces */
	76	if (ifs.if_net == LOOPBACKNET)
	77	continue;
	78	ifp = (struct interface *)malloc(sizeof (struct interface));
	79	if (ifp == 0) {
	80	printf("routed: out of memory\n");
	81	break;
	82	}
	83	/*
	84	* Count the # of directly connected networks
	85	* and point to point links which aren't looped
86	* back to ourself. This is used below to
87	* decide if we should be a routing ``supplier''.
88	*/
89	if ((ifs.if_flags & IFF_POINTOPOINT) == 0 \|\|
90	if_ifwithaddr(&ifs.if_dstaddr) == 0)
91	externalinterfaces++;
92	lseek(kmem, ifs.if_name, 0);
93	read(kmem, name, sizeof (name));
94	name[sizeof (name) - 1] = '\0';
95	cp = index(name, '\0');
96	*cp++ = ifs.if_unit + '0';
97	*cp = '\0';
98	ifp->int_name = malloc(strlen(name) + 1);
99	if (ifp->int_name == 0) {
100	fprintf(stderr, "routed: ifinit: out of memory\n");
101	goto bad; /* ??? */
102	}
103	strcpy(ifp->int_name, name);
104	ifp->int_addr = ifs.if_addr;
105	ifp->int_flags = ifs.if_flags \| IFF_INTERFACE;
106	/* this works because broadaddr overlaps dstaddr */
107	ifp->int_broadaddr = ifs.if_broadaddr;
108	ifp->int_net = ifs.if_net;
109	ifp->int_metric = 0;
110	ifp->int_next = ifnet;
111	ifnet = ifp;
112	traceinit(ifp);
113	addrouteforif(ifp);
114	}
115	if (externalinterfaces > 1 && supplier < 0)
116	supplier = 1;
117	return;
118	bad:
119	sleep(60);
7fe7fe74	120	close(kmem), close(s);
85d8a62e SL	121	execv("/etc/routed", argv0);
	122	_exit(0177);
	123	}
	124
	125	addrouteforif(ifp)
	126	struct interface *ifp;
	127	{
	128	struct sockaddr_in net;
	129	struct sockaddr *dst;
	130	int state, metric;
	131	struct rt_entry *rt;
	132
	133	if (ifp->int_flags & IFF_POINTOPOINT)
	134	dst = &ifp->int_dstaddr;
	135	else {
	136	bzero((char *)&net, sizeof (net));
	137	net.sin_family = AF_INET;
	138	net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
	139	dst = (struct sockaddr *)&net;
	140	}
	141	rt = rtlookup(dst);
	142	rtadd(dst, &ifp->int_addr, ifp->int_metric,
	143	ifp->int_flags & (IFF_INTERFACE\|IFF_PASSIVE\|IFF_REMOTE));
	144	if (rt)
	145	rtdelete(rt);
	146	}
	147
	148	/*
	149	* As a concession to the ARPANET we read a list of gateways
	150	* from /etc/gateways and add them to our tables. This file
	151	* exists at each ARPANET gateway and indicates a set of ``remote''
	152	* gateways (i.e. a gateway which we can't immediately determine
	153	* if it's present or not as we can do for those directly connected
	154	* at the hardware level). If a gateway is marked ``passive''
	155	* in the file, then we assume it doesn't have a routing process
	156	* of our design and simply assume it's always present. Those
	157	* not marked passive are treated as if they were directly
	158	* connected -- they're added into the interface list so we'll
	159	* send them routing updates.
	160	*/
	161	gwkludge()
	162	{
	163	struct sockaddr_in dst, gate;
	164	FILE *fp;
	165	char type, dname, gname, qual, buf[BUFSIZ];
	166	struct interface *ifp;
	167	int metric;
	168
	169	fp = fopen("/etc/gateways", "r");
	170	if (fp == NULL)
	171	return;
	172	qual = buf;
	173	dname = buf + 64;
	174	gname = buf + ((BUFSIZ - 64) / 3);
	175	type = buf + (((BUFSIZ - 64) * 2) / 3);
	176	bzero((char *)&dst, sizeof (dst));
	177	bzero((char *)&gate, sizeof (gate));
85d8a62e SL	178	/* format: {net \| host} XX gateway XX metric DD [passive]\n */
	179	#define readentry(fp) \
	180	fscanf((fp), "%s %s gateway %s metric %d %s\n", \
	181	type, dname, gname, &metric, qual)
	182	for (;;) {
85d8a62e SL	183	if (readentry(fp) == EOF)
85d8a62e SL	184	break;
7fe7fe74	185	if (!getnetorhostname(type, dname, &dst))
85d8a62e	186	continue;
7fe7fe74	187	if (!gethostnameornumber(gname, &gate))
85d8a62e	188	continue;
85d8a62e SL	189	ifp = (struct interface )malloc(sizeof (ifp));
	190	bzero((char )ifp, sizeof (ifp));
	191	ifp->int_flags = IFF_REMOTE;
	192	/* can't identify broadcast capability */
	193	ifp->int_net = inet_netof(dst.sin_addr);
	194	if (strcmp(type, "host") == 0) {
	195	ifp->int_flags \|= IFF_POINTOPOINT;
	196	ifp->int_dstaddr = ((struct sockaddr )&dst);
	197	}
	198	if (strcmp(qual, "passive") == 0)
	199	ifp->int_flags \|= IFF_PASSIVE;
	200	else
	201	/* assume no duplicate entries */
	202	externalinterfaces++;
	203	ifp->int_addr = ((struct sockaddr )&gate);
	204	ifp->int_metric = metric;
	205	ifp->int_next = ifnet;
	206	ifnet = ifp;
	207	addrouteforif(ifp);
	208	}
	209	fclose(fp);
	210	}
7fe7fe74 SL	211
	212	getnetorhostname(type, name, sin)
	213	char type, name;
	214	struct sockaddr_in *sin;
	215	{
	216
	217	if (strcmp(type, "net") == 0) {
	218	struct netent *np = getnetbyname(name);
	219	int n;
	220
7fe7fe74 SL	221	if (np == 0)
7fe7fe74 SL	222	n = inet_network(name);
20932249 SL	223	else {
	224	if (np->n_addrtype != AF_INET)
	225	return (0);
7fe7fe74	226	n = np->n_net;
20932249	227	}
7fe7fe74 SL	228	sin->sin_family = AF_INET;
	229	sin->sin_addr = inet_makeaddr(n, INADDR_ANY);
	230	return (1);
	231	}
	232	if (strcmp(type, "host") == 0) {
	233	struct hostent *hp = gethostbyname(name);
	234
7fe7fe74 SL	235	if (hp == 0)
7fe7fe74 SL	236	sin->sin_addr.s_addr = inet_addr(name);
20932249 SL	237	else {
	238	if (hp->h_addrtype != AF_INET)
	239	return (0);
7fe7fe74	240	bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
20932249	241	}
7fe7fe74 SL	242	sin->sin_family = AF_INET;
	243	return (1);
	244	}
	245	return (0);
	246	}
	247
	248	gethostnameornumber(name, sin)
	249	char *name;
	250	struct sockaddr_in *sin;
	251	{
	252	struct hostent *hp;
	253
	254	hp = gethostbyname(name);
	255	if (hp) {
	256	bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
	257	sin->sin_family = hp->h_addrtype;
	258	return (1);
	259	}
	260	sin->sin_addr.s_addr = inet_addr(name);
	261	sin->sin_family = AF_INET;
	262	return (sin->sin_addr.s_addr != -1);
	263	}