xref: /dragonfly/usr.bin/systat/netstat.c (revision b3e108b2) 
1 /*-
2  * Copyright (c) 1980, 1992, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * @(#)netstat.c	8.1 (Berkeley) 6/6/93
34  * $FreeBSD: src/usr.bin/systat/netstat.c,v 1.13 1999/08/30 08:18:08 peter Exp $
35  * $DragonFly: src/usr.bin/systat/netstat.c,v 1.8 2004/12/20 11:03:16 joerg Exp $
36  */
37 
38 /*
39  * netstat
40  */
41 #include <sys/param.h>
42 #include <sys/queue.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45 #include <sys/protosw.h>
46 #include <sys/sysctl.h>
47 
48 #include <netinet/in.h>
49 #include <arpa/inet.h>
50 #include <net/route.h>
51 #include <netinet/in_systm.h>
52 #include <netinet/ip.h>
53 #include <netinet/in_pcb.h>
54 #include <netinet/ip_icmp.h>
55 #include <netinet/icmp_var.h>
56 #include <netinet/ip_var.h>
57 #include <netinet/tcp.h>
58 #include <netinet/tcpip.h>
59 #include <netinet/tcp_seq.h>
60 #define TCPSTATES
61 #include <netinet/tcp_fsm.h>
62 #include <netinet/tcp_timer.h>
63 #include <netinet/tcp_var.h>
64 #include <netinet/tcp_debug.h>
65 #include <netinet/udp.h>
66 #include <netinet/udp_var.h>
67 
68 #include <err.h>
69 #include <errno.h>
70 #include <netdb.h>
71 #include <stdlib.h>
72 #include <string.h>
73 #include <nlist.h>
74 #include <paths.h>
75 #include "systat.h"
76 #include "extern.h"
77 
78 static void enter(struct inpcb *, struct xsocket *, int, const char *);
79 static char *inetname(struct in_addr);
80 static void inetprint(struct in_addr *, int, const char *);
81 
82 #define	streq(a,b)	(strcmp(a,b)==0)
83 #define	YMAX(w)		((w)->_maxy-1)
84 
85 WINDOW *
86 opennetstat(void)
87 {
88 	sethostent(1);
89 	setnetent(1);
90 	return (subwin(stdscr, LINES-5-1, 0, 5, 0));
91 }
92 
93 struct netinfo {
94 	struct	netinfo *ni_forw, *ni_prev;
95 	short	ni_line;		/* line on screen */
96 	short	ni_seen;		/* 0 when not present in list */
97 	short	ni_flags;
98 #define	NIF_LACHG	0x1		/* local address changed */
99 #define	NIF_FACHG	0x2		/* foreign address changed */
100 	short	ni_state;		/* tcp state */
101 	const char *ni_proto;		/* protocol */
102 	struct	in_addr ni_laddr;	/* local address */
103 	long	ni_lport;		/* local port */
104 	struct	in_addr	ni_faddr;	/* foreign address */
105 	long	ni_fport;		/* foreign port */
106 	long	ni_rcvcc;		/* rcv buffer character count */
107 	long	ni_sndcc;		/* snd buffer character count */
108 };
109 
110 static struct {
111 	struct	netinfo *ni_forw, *ni_prev;
112 } netcb;
113 
114 static	int aflag = 0;
115 static	int nflag = 0;
116 static	int lastrow = 1;
117 
118 void
119 closenetstat(WINDOW *w)
120 {
121 	register struct netinfo *p;
122 
123 	endhostent();
124 	endnetent();
125 	p = (struct netinfo *)netcb.ni_forw;
126 	while (p != (struct netinfo *)&netcb) {
127 		if (p->ni_line != -1)
128 			lastrow--;
129 		p->ni_line = -1;
130 		p = p->ni_forw;
131 	}
132         if (w != NULL) {
133 		wclear(w);
134 		wrefresh(w);
135 		delwin(w);
136 	}
137 }
138 
139 int
140 initnetstat(void)
141 {
142 	netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
143 	protos = TCP|UDP;
144 	return(1);
145 }
146 
147 static void
148 enter_tcp(void *xig)
149 {
150 	struct xtcpcb *xtcp = (struct xtcpcb *)xig;
151 	struct xsocket *xso;
152 	int state;
153 
154 	if (xtcp->xt_len < sizeof(*xtcp))
155 		return;
156 	xso = &xtcp->xt_socket;
157 	state = xtcp->xt_tp.t_state;
158 	enter(&xtcp->xt_inp, xso, state, "tcp");
159 }
160 
161 static void
162 enter_udp(void *xig)
163 {
164 	struct xinpcb *xinp = (struct xinpcb *)xig;
165 	struct xsocket *xso;
166 
167 	if (xinp->xi_len < sizeof(*xinp))
168 		return;
169 	xso = &xinp->xi_socket;
170 	enter(&xinp->xi_inp, xso, 0, "udp");
171 }
172 
173 static void
174 fetchnetstat_proto(void (*enter_proto)(void *),
175     const char *mibvar)
176 {
177 	char *buf, *buf2;
178 	size_t i, len, elem_len;
179 
180 	if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
181 		if (errno != ENOENT)
182 			warn("sysctl: %s", mibvar);
183 		return;
184 	}
185 	if ((buf = malloc(len)) == NULL) {
186 		warn("malloc %lu bytes", (u_long)len);
187 		return;
188 	}
189 	if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
190 		warn("sysctl: %s", mibvar);
191 		free(buf);
192 		return;
193 	}
194 
195 	/*
196 	 * XXX this is better with a single PCB type
197 	 */
198 	if (len == 0) {
199 		free(buf);
200 		return;
201 	}
202 	if (len < sizeof(size_t)) {
203 		warnx("sysctl: short read");
204 		free(buf);
205 		return;
206 	}
207 	elem_len = *(size_t *)buf;
208 	len /= elem_len;
209 	buf2 = buf;
210 	for (i = 0; i < len; i++, buf2 += elem_len) {
211 		if (*(size_t *)(buf2) != elem_len) {
212 			warn("sysctl: inconsistent PCB len");
213 			free(buf);
214 			return;
215 		}
216 		enter_proto(buf2);
217 	}
218 	free(buf);
219 }
220 
221 void
222 fetchnetstat(void)
223 {
224 	register struct netinfo *p;
225 
226 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
227 		p->ni_seen = 0;
228 	if (protos & TCP)
229 		fetchnetstat_proto(enter_tcp, "net.inet.tcp.pcblist");
230 	if (protos & UDP)
231 		fetchnetstat_proto(enter_udp, "net.inet.udp.pcblist");
232 }
233 
234 static void
235 enter(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
236 {
237 	register struct netinfo *p;
238 
239 	if (!aflag && inet_lnaof(inp->inp_laddr) == INADDR_ANY)
240 		return;
241 	if (nhosts && !checkhost(inp))
242 		return;
243 	if (nports && !checkport(inp))
244 		return;
245 	/*
246 	 * pcblist may return non-ipv4 sockets, but at the moment
247 	 * -netstat code doesn't support other than ipv4.
248 	 */
249 	if ((inp->inp_vflag & INP_IPV4) == 0)
250 		return;
251 	/*
252 	 * Only take exact matches, any sockets with
253 	 * previously unbound addresses will be deleted
254 	 * below in the display routine because they
255 	 * will appear as ``not seen'' in the kernel
256 	 * data structures.
257 	 */
258 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
259 		if (!streq(proto, p->ni_proto))
260 			continue;
261 		if (p->ni_lport != inp->inp_lport ||
262 		    p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
263 			continue;
264 		if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
265 		    p->ni_fport == inp->inp_fport)
266 			break;
267 	}
268 	if (p == (struct netinfo *)&netcb) {
269 		if ((p = malloc(sizeof(*p))) == NULL) {
270 			error("Out of memory");
271 			return;
272 		}
273 		p->ni_prev = (struct netinfo *)&netcb;
274 		p->ni_forw = netcb.ni_forw;
275 		netcb.ni_forw->ni_prev = p;
276 		netcb.ni_forw = p;
277 		p->ni_line = -1;
278 		p->ni_laddr = inp->inp_laddr;
279 		p->ni_lport = inp->inp_lport;
280 		p->ni_faddr = inp->inp_faddr;
281 		p->ni_fport = inp->inp_fport;
282 		p->ni_proto = proto;
283 		p->ni_flags = NIF_LACHG|NIF_FACHG;
284 	}
285 	p->ni_rcvcc = so->so_rcv.sb_cc;
286 	p->ni_sndcc = so->so_snd.sb_cc;
287 	p->ni_state = state;
288 	p->ni_seen = 1;
289 }
290 
291 /* column locations */
292 #define	LADDR	0
293 #define	FADDR	LADDR+22
294 #define	CPUID	FADDR+22
295 #define	PROTO	CPUID+4
296 #define	RCVCC	PROTO+6
297 #define	SNDCC	RCVCC+7
298 #define	STATE	SNDCC+7
299 
300 
301 void
302 labelnetstat(void)
303 {
304 	wmove(wnd, 0, 0); wclrtobot(wnd);
305 	mvwaddstr(wnd, 0, LADDR, "Local Address");
306 	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
307 	mvwaddstr(wnd, 0, PROTO, "Proto");
308 	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
309 	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
310 	mvwaddstr(wnd, 0, STATE, "(state)");
311 }
312 
313 void
314 shownetstat(void)
315 {
316 	register struct netinfo *p, *q;
317 
318 	/*
319 	 * First, delete any connections that have gone
320 	 * away and adjust the position of connections
321 	 * below to reflect the deleted line.
322 	 */
323 	p = netcb.ni_forw;
324 	while (p != (struct netinfo *)&netcb) {
325 		if (p->ni_line == -1 || p->ni_seen) {
326 			p = p->ni_forw;
327 			continue;
328 		}
329 		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
330 		q = netcb.ni_forw;
331 		for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
332 			if (q != p && q->ni_line > p->ni_line) {
333 				q->ni_line--;
334 				/* this shouldn't be necessary */
335 				q->ni_flags |= NIF_LACHG|NIF_FACHG;
336 			}
337 		lastrow--;
338 		q = p->ni_forw;
339 		p->ni_prev->ni_forw = p->ni_forw;
340 		p->ni_forw->ni_prev = p->ni_prev;
341 		free(p);
342 		p = q;
343 	}
344 	/*
345 	 * Update existing connections and add new ones.
346 	 */
347 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
348 		if (p->ni_line == -1) {
349 			/*
350 			 * Add a new entry if possible.
351 			 */
352 			if (lastrow > YMAX(wnd))
353 				continue;
354 			p->ni_line = lastrow++;
355 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
356 		}
357 		if (p->ni_flags & NIF_LACHG) {
358 			wmove(wnd, p->ni_line, LADDR);
359 			inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
360 			p->ni_flags &= ~NIF_LACHG;
361 		}
362 		if (p->ni_flags & NIF_FACHG) {
363 			wmove(wnd, p->ni_line, FADDR);
364 			inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
365 			p->ni_flags &= ~NIF_FACHG;
366 		}
367 		mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
368 		mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
369 		mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
370 		if (streq(p->ni_proto, "tcp"))
371 			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
372 				mvwprintw(wnd, p->ni_line, STATE, "%d",
373 				    p->ni_state);
374 			else
375 				mvwaddstr(wnd, p->ni_line, STATE,
376 				    tcpstates[p->ni_state]);
377 		wclrtoeol(wnd);
378 	}
379 	if (lastrow < YMAX(wnd)) {
380 		wmove(wnd, lastrow, 0); wclrtobot(wnd);
381 		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
382 	}
383 }
384 
385 /*
386  * Pretty print an Internet address (net address + port).
387  * If the nflag was specified, use numbers instead of names.
388  */
389 static void
390 inetprint(register struct in_addr *in, int port, const char *proto)
391 {
392 	struct servent *sp = 0;
393 	char line[80], *cp;
394 
395 	snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
396 	cp = strchr(line, '\0');
397 	if (!nflag && port)
398 		sp = getservbyport(port, proto);
399 	if (sp || port == 0)
400 		snprintf(cp, sizeof(line) - (cp - line), "%.8s",
401 		    sp ? sp->s_name : "*");
402 	else
403 		snprintf(cp, sizeof(line) - (cp - line), "%d",
404 		    ntohs((u_short)port));
405 	/* pad to full column to clear any garbage */
406 	cp = strchr(line, '\0');
407 	while (cp - line < 22)
408 		*cp++ = ' ';
409 	line[22] = '\0';
410 	waddstr(wnd, line);
411 }
412 
413 /*
414  * Construct an Internet address representation.
415  * If the nflag has been supplied, give
416  * numeric value, otherwise try for symbolic name.
417  */
418 static char *
419 inetname(struct in_addr in)
420 {
421 	char *cp = 0;
422 	static char line[50];
423 	struct hostent *hp;
424 	struct netent *np;
425 
426 	if (!nflag && in.s_addr != INADDR_ANY) {
427 		int net = inet_netof(in);
428 		int lna = inet_lnaof(in);
429 
430 		if (lna == INADDR_ANY) {
431 			np = getnetbyaddr(net, AF_INET);
432 			if (np)
433 				cp = np->n_name;
434 		}
435 		if (cp == 0) {
436 			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
437 			if (hp)
438 				cp = hp->h_name;
439 		}
440 	}
441 	if (in.s_addr == INADDR_ANY)
442 		strcpy(line, "*");
443 	else if (cp)
444 		snprintf(line, sizeof(line), "%s", cp);
445 	else {
446 		in.s_addr = ntohl(in.s_addr);
447 #define C(x)	((x) & 0xff)
448 		snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
449 			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
450 	}
451 	return (line);
452 }
453 
454 int
455 cmdnetstat(char *cmd, char *args)
456 {
457 	register struct netinfo *p;
458 
459 	if (prefix(cmd, "all")) {
460 		aflag = !aflag;
461 		goto fixup;
462 	}
463 	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
464 		int new;
465 
466 		new = prefix(cmd, "numbers");
467 		if (new == nflag)
468 			return (1);
469 		p = netcb.ni_forw;
470 		for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
471 			if (p->ni_line == -1)
472 				continue;
473 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
474 		}
475 		nflag = new;
476 		goto redisplay;
477 	}
478 	if (!netcmd(cmd, args))
479 		return (0);
480 fixup:
481 	fetchnetstat();
482 redisplay:
483 	shownetstat();
484 	refresh();
485 	return (1);
486 }
487