summaryrefslogtreecommitdiffstats
path: root/usr.bin/systat/netstat.c
blob: 0303bf52ad4962d23c022fa642d24e4625ee106c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
/*-
 * Copyright (c) 1980, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
static char sccsid[] = "@(#)netstat.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

/*
 * netstat
 */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>

#include <netinet/in.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp_var.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_seq.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_debug.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>

#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <nlist.h>
#include <paths.h>
#include "systat.h"
#include "extern.h"

static void enter __P((struct inpcb *, struct socket *, int, char *));
static char *inetname __P((struct in_addr));
static void inetprint __P((struct in_addr *, int, char *));

#define	streq(a,b)	(strcmp(a,b)==0)
#define	YMAX(w)		((w)->maxy-1)

WINDOW *
opennetstat()
{
	sethostent(1);
	setnetent(1);
	return (subwin(stdscr, LINES-5-1, 0, 5, 0));
}

struct netinfo {
	struct	netinfo *ni_forw, *ni_prev;
	short	ni_line;		/* line on screen */
	short	ni_seen;		/* 0 when not present in list */
	short	ni_flags;
#define	NIF_LACHG	0x1		/* local address changed */
#define	NIF_FACHG	0x2		/* foreign address changed */
	short	ni_state;		/* tcp state */
	char	*ni_proto;		/* protocol */
	struct	in_addr ni_laddr;	/* local address */
	long	ni_lport;		/* local port */
	struct	in_addr	ni_faddr;	/* foreign address */
	long	ni_fport;		/* foreign port */
	long	ni_rcvcc;		/* rcv buffer character count */
	long	ni_sndcc;		/* snd buffer character count */
};

static struct {
	struct	netinfo *ni_forw, *ni_prev;
} netcb;

static	int aflag = 0;
static	int nflag = 0;
static	int lastrow = 1;
static	void enter(), inetprint();
static	char *inetname();

void
closenetstat(w)
        WINDOW *w;
{
	register struct netinfo *p;

	endhostent();
	endnetent();
	p = (struct netinfo *)netcb.ni_forw;
	while (p != (struct netinfo *)&netcb) {
		if (p->ni_line != -1)
			lastrow--;
		p->ni_line = -1;
		p = p->ni_forw;
	}
        if (w != NULL) {
		wclear(w);
		wrefresh(w);
		delwin(w);
	}
}

static struct nlist namelist[] = {
#define	X_TCB	0
	{ "_tcb" },
#define	X_UDB	1
	{ "_udb" },
	{ "" },
};

int
initnetstat()
{
	if (kvm_nlist(kd, namelist)) {
		nlisterr(namelist);
		return(0);
	}
	if (namelist[X_TCB].n_value == 0) {
		error("No symbols in namelist");
		return(0);
	}
	netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
	protos = TCP|UDP;
	return(1);
}

void
fetchnetstat()
{
	register struct inpcb *prev, *next;
	register struct netinfo *p;
	struct inpcb inpcb;
	struct socket sockb;
	struct tcpcb tcpcb;
	void *off;
	int istcp;

	if (namelist[X_TCB].n_value == 0)
		return;
	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
		p->ni_seen = 0;
	if (protos&TCP) {
		off = NPTR(X_TCB); 
		istcp = 1;
	}
	else if (protos&UDP) {
		off = NPTR(X_UDB); 
		istcp = 0;
	}
	else {
		error("No protocols to display");
		return;
	}
again:
	KREAD(off, &inpcb, sizeof (struct inpcb));
	prev = off;
	for (; inpcb.inp_next != off; prev = next) {
		next = inpcb.inp_next;
		KREAD(next, &inpcb, sizeof (inpcb));
		if (inpcb.inp_prev != prev) {
			p = netcb.ni_forw;
			for (; p != (struct netinfo *)&netcb; p = p->ni_forw)
				p->ni_seen = 1;
			error("Kernel state in transition");
			return;
		}
		if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
			continue;
		if (nhosts && !checkhost(&inpcb))
			continue;
		if (nports && !checkport(&inpcb))
			continue;
		KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
		if (istcp) {
			KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
			enter(&inpcb, &sockb, tcpcb.t_state, "tcp");
		} else
			enter(&inpcb, &sockb, 0, "udp");
	}
	if (istcp && (protos&UDP)) {
		istcp = 0;
		off = NPTR(X_UDB);
		goto again;
	}
}

static void
enter(inp, so, state, proto)
	register struct inpcb *inp;
	register struct socket *so;
	int state;
	char *proto;
{
	register struct netinfo *p;

	/*
	 * Only take exact matches, any sockets with
	 * previously unbound addresses will be deleted
	 * below in the display routine because they
	 * will appear as ``not seen'' in the kernel
	 * data structures.
	 */
	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
		if (!streq(proto, p->ni_proto))
			continue;
		if (p->ni_lport != inp->inp_lport ||
		    p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
			continue;
		if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
		    p->ni_fport == inp->inp_fport)
			break;
	}
	if (p == (struct netinfo *)&netcb) {
		if ((p = malloc(sizeof(*p))) == NULL) {
			error("Out of memory");
			return;
		}
		p->ni_prev = (struct netinfo *)&netcb;
		p->ni_forw = netcb.ni_forw;
		netcb.ni_forw->ni_prev = p;
		netcb.ni_forw = p;
		p->ni_line = -1;
		p->ni_laddr = inp->inp_laddr;
		p->ni_lport = inp->inp_lport;
		p->ni_faddr = inp->inp_faddr;
		p->ni_fport = inp->inp_fport;
		p->ni_proto = proto;
		p->ni_flags = NIF_LACHG|NIF_FACHG;
	}
	p->ni_rcvcc = so->so_rcv.sb_cc;
	p->ni_sndcc = so->so_snd.sb_cc;
	p->ni_state = state;
	p->ni_seen = 1;
}

/* column locations */
#define	LADDR	0
#define	FADDR	LADDR+23
#define	PROTO	FADDR+23
#define	RCVCC	PROTO+6
#define	SNDCC	RCVCC+7
#define	STATE	SNDCC+7


void
labelnetstat()
{
	if (namelist[X_TCB].n_type == 0)
		return;
	wmove(wnd, 0, 0); wclrtobot(wnd);
	mvwaddstr(wnd, 0, LADDR, "Local Address");
	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
	mvwaddstr(wnd, 0, PROTO, "Proto");
	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
	mvwaddstr(wnd, 0, STATE, "(state)"); 
}

void
shownetstat()
{
	register struct netinfo *p, *q;

	/*
	 * First, delete any connections that have gone
	 * away and adjust the position of connections
	 * below to reflect the deleted line.
	 */
	p = netcb.ni_forw;
	while (p != (struct netinfo *)&netcb) {
		if (p->ni_line == -1 || p->ni_seen) {
			p = p->ni_forw;
			continue;
		}
		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
		q = netcb.ni_forw;
		for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
			if (q != p && q->ni_line > p->ni_line) {
				q->ni_line--;
				/* this shouldn't be necessary */
				q->ni_flags |= NIF_LACHG|NIF_FACHG;
			}
		lastrow--;
		q = p->ni_forw;
		p->ni_prev->ni_forw = p->ni_forw;
		p->ni_forw->ni_prev = p->ni_prev;
		free(p);
		p = q;
	}
	/*
	 * Update existing connections and add new ones.
	 */
	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
		if (p->ni_line == -1) {
			/*
			 * Add a new entry if possible.
			 */
			if (lastrow > YMAX(wnd))
				continue;
			p->ni_line = lastrow++;
			p->ni_flags |= NIF_LACHG|NIF_FACHG;
		}
		if (p->ni_flags & NIF_LACHG) {
			wmove(wnd, p->ni_line, LADDR);
			inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
			p->ni_flags &= ~NIF_LACHG;
		}
		if (p->ni_flags & NIF_FACHG) {
			wmove(wnd, p->ni_line, FADDR);
			inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
			p->ni_flags &= ~NIF_FACHG;
		}
		mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
		mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
		mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
		if (streq(p->ni_proto, "tcp"))
			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
				mvwprintw(wnd, p->ni_line, STATE, "%d",
				    p->ni_state);
			else
				mvwaddstr(wnd, p->ni_line, STATE,
				    tcpstates[p->ni_state]);
		wclrtoeol(wnd);
	}
	if (lastrow < YMAX(wnd)) {
		wmove(wnd, lastrow, 0); wclrtobot(wnd);
		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
	}
}

/*
 * Pretty print an Internet address (net address + port).
 * If the nflag was specified, use numbers instead of names.
 */
static void
inetprint(in, port, proto)
	register struct in_addr *in;
	int port;
	char *proto;
{
	struct servent *sp = 0;
	char line[80], *cp, *index();

	sprintf(line, "%.*s.", 16, inetname(*in));
	cp = index(line, '\0');
	if (!nflag && port)
		sp = getservbyport(port, proto);
	if (sp || port == 0)
		sprintf(cp, "%.8s", sp ? sp->s_name : "*");
	else
		sprintf(cp, "%d", ntohs((u_short)port));
	/* pad to full column to clear any garbage */
	cp = index(line, '\0');
	while (cp - line < 22)
		*cp++ = ' ';
	*cp = '\0';
	waddstr(wnd, line);
}

/*
 * Construct an Internet address representation.
 * If the nflag has been supplied, give 
 * numeric value, otherwise try for symbolic name.
 */
static char *
inetname(in)
	struct in_addr in;
{
	char *cp = 0;
	static char line[50];
	struct hostent *hp;
	struct netent *np;

	if (!nflag && in.s_addr != INADDR_ANY) {
		int net = inet_netof(in);
		int lna = inet_lnaof(in);

		if (lna == INADDR_ANY) {
			np = getnetbyaddr(net, AF_INET);
			if (np)
				cp = np->n_name;
		}
		if (cp == 0) {
			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
			if (hp)
				cp = hp->h_name;
		}
	}
	if (in.s_addr == INADDR_ANY)
		strcpy(line, "*");
	else if (cp)
		strcpy(line, cp);
	else {
		in.s_addr = ntohl(in.s_addr);
#define C(x)	((x) & 0xff)
		sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
	}
	return (line);
}

int
cmdnetstat(cmd, args)
	char *cmd, *args;
{
	register struct netinfo *p;

	if (prefix(cmd, "all")) {
		aflag = !aflag;
		goto fixup;
	}
	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
		int new;

		new = prefix(cmd, "numbers");
		if (new == nflag)
			return (1);
		p = netcb.ni_forw;
		for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
			if (p->ni_line == -1)
				continue;
			p->ni_flags |= NIF_LACHG|NIF_FACHG;
		}
		nflag = new;
		goto redisplay;
	}
	if (!netcmd(cmd, args))
		return (0);
fixup:
	fetchnetstat();
redisplay:
	shownetstat();
	refresh();
	return (1);
}
OpenPOWER on IntegriCloud