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

#ifndef lint
static char sccsid[] = "@(#)startup.c	4.1 %G%";
#endif

/*
 * Routing Table Management Daemon
 */
#include "router.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" },
	0,
};

/*
 * 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), close(snoroute);
	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));
	dst.sin_family = gate.sin_family = AF_INET;
	/* 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 (;;) {
		struct hostent *host;
		struct netent *net;

		if (readentry(fp) == EOF)
			break;
		if (strcmp(type, "net") == 0) {
			net = getnetbyname(dname);
			if (net == 0 || net->n_addrtype != AF_INET)
				continue;
			dst.sin_addr = inet_makeaddr(net->n_net, INADDR_ANY);
		} else if (strcmp(type, "host") == 0) {
			host = gethostbyname(dname);
			if (host == 0)
				continue;
			bcopy(host->h_addr, &dst.sin_addr, host->h_length);
		} else
			continue;
		host = gethostbyname(gname);
		if (host == 0)
			continue;
		bcopy(host->h_addr, &gate.sin_addr, host->h_length);
		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);
}
Commit	Line	Data
85d8a62e SL	1	#ifndef lint
	2	static char sccsid[] = "@(#)startup.c 4.1 %G%";
	3	#endif
	4
	5	/*
	6	* Routing Table Management Daemon
	7	*/
	8	#include "router.h"
	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" },
	21	0,
	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);
120	close(kmem), close(s), close(snoroute);
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));
178	dst.sin_family = gate.sin_family = AF_INET;
179	/* format: {net \| host} XX gateway XX metric DD [passive]\n */
180	#define readentry(fp) \
181	fscanf((fp), "%s %s gateway %s metric %d %s\n", \
182	type, dname, gname, &metric, qual)
183	for (;;) {
184	struct hostent *host;
185	struct netent *net;
186
187	if (readentry(fp) == EOF)
188	break;
189	if (strcmp(type, "net") == 0) {
190	net = getnetbyname(dname);
191	if (net == 0 \|\| net->n_addrtype != AF_INET)
192	continue;
193	dst.sin_addr = inet_makeaddr(net->n_net, INADDR_ANY);
194	} else if (strcmp(type, "host") == 0) {
195	host = gethostbyname(dname);
196	if (host == 0)
197	continue;
198	bcopy(host->h_addr, &dst.sin_addr, host->h_length);
199	} else
200	continue;
201	host = gethostbyname(gname);
202	if (host == 0)
203	continue;
204	bcopy(host->h_addr, &gate.sin_addr, host->h_length);
205	ifp = (struct interface )malloc(sizeof (ifp));
206	bzero((char )ifp, sizeof (ifp));
207	ifp->int_flags = IFF_REMOTE;
208	/* can't identify broadcast capability */
209	ifp->int_net = inet_netof(dst.sin_addr);
210	if (strcmp(type, "host") == 0) {
211	ifp->int_flags \|= IFF_POINTOPOINT;
212	ifp->int_dstaddr = ((struct sockaddr )&dst);
213	}
214	if (strcmp(qual, "passive") == 0)
215	ifp->int_flags \|= IFF_PASSIVE;
216	else
217	/* assume no duplicate entries */
218	externalinterfaces++;
219	ifp->int_addr = ((struct sockaddr )&gate);
220	ifp->int_metric = metric;
221	ifp->int_next = ifnet;
222	ifnet = ifp;
223	addrouteforif(ifp);
224	}
225	fclose(fp);
226	}