xref: /dragonfly/usr.bin/systat/netstat.c (revision cfd1aba3) 
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. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * @(#)netstat.c	8.1 (Berkeley) 6/6/93
30  * $FreeBSD: src/usr.bin/systat/netstat.c,v 1.13 1999/08/30 08:18:08 peter Exp $
31  */
32 
33 /*
34  * netstat
35  */
36 #include <sys/param.h>
37 #include <sys/queue.h>
38 #include <sys/socket.h>
39 #include <sys/socketvar.h>
40 #include <sys/protosw.h>
41 #include <sys/sysctl.h>
42 
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
45 #include <net/route.h>
46 #include <netinet/in_systm.h>
47 #include <netinet/ip.h>
48 #ifdef INET6
49 #include <netinet/ip6.h>
50 #endif
51 #include <netinet/in_pcb.h>
52 #include <netinet/ip_icmp.h>
53 #include <netinet/icmp_var.h>
54 #include <netinet/ip_var.h>
55 #include <netinet/tcp.h>
56 #include <netinet/tcpip.h>
57 #include <netinet/tcp_seq.h>
58 #define TCPSTATES
59 #include <netinet/tcp_fsm.h>
60 #include <netinet/tcp_timer.h>
61 #include <netinet/tcp_var.h>
62 #include <netinet/tcp_debug.h>
63 #include <netinet/udp.h>
64 #include <netinet/udp_var.h>
65 
66 #include <err.h>
67 #include <errno.h>
68 #include <netdb.h>
69 #include <stdlib.h>
70 #include <string.h>
71 #include <nlist.h>
72 #include <paths.h>
73 #include "systat.h"
74 #include "extern.h"
75 
76 static void enter(struct inpcb *, struct xsocket *, int, const char *);
77 static char *inetname(struct in_addr);
78 static void inetprint(struct in_addr *, int, const char *);
79 
80 #define	streq(a,b)	(strcmp(a,b)==0)
81 #define	YMAX(w)		((w)->_maxy-1)
82 
83 WINDOW *
84 opennetstat(void)
85 {
86 	sethostent(1);
87 	setnetent(1);
88 	return (subwin(stdscr, LINES-5-1, 0, 5, 0));
89 }
90 
91 struct netinfo {
92 	struct	netinfo *ni_forw, *ni_prev;
93 	short	ni_line;		/* line on screen */
94 	short	ni_seen;		/* 0 when not present in list */
95 	short	ni_flags;
96 #define	NIF_LACHG	0x1		/* local address changed */
97 #define	NIF_FACHG	0x2		/* foreign address changed */
98 	short	ni_state;		/* tcp state */
99 	const char *ni_proto;		/* protocol */
100 	struct	in_addr ni_laddr;	/* local address */
101 	long	ni_lport;		/* local port */
102 	struct	in_addr	ni_faddr;	/* foreign address */
103 	long	ni_fport;		/* foreign port */
104 	long	ni_rcvcc;		/* rcv buffer character count */
105 	long	ni_sndcc;		/* snd buffer character count */
106 };
107 
108 static struct {
109 	struct	netinfo *ni_forw, *ni_prev;
110 } netcb;
111 
112 static	int aflag = 0;
113 static	int nflag = 0;
114 static	int lastrow = 1;
115 
116 void
117 closenetstat(WINDOW *w)
118 {
119 	struct netinfo *p;
120 
121 	endhostent();
122 	endnetent();
123 	p = (struct netinfo *)netcb.ni_forw;
124 	while (p != (struct netinfo *)&netcb) {
125 		if (p->ni_line != -1)
126 			lastrow--;
127 		p->ni_line = -1;
128 		p = p->ni_forw;
129 	}
130         if (w != NULL) {
131 		wclear(w);
132 		wrefresh(w);
133 		delwin(w);
134 	}
135 }
136 
137 int
138 initnetstat(void)
139 {
140 	netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
141 	protos = TCP|UDP;
142 	return(1);
143 }
144 
145 static void
146 enter_tcp(void *xig)
147 {
148 	struct xtcpcb *xtcp = (struct xtcpcb *)xig;
149 	struct xsocket *xso;
150 	int state;
151 
152 	if (xtcp->xt_len < sizeof(*xtcp))
153 		return;
154 	xso = &xtcp->xt_socket;
155 	state = xtcp->xt_tp.t_state;
156 	enter(&xtcp->xt_inp, xso, state, "tcp");
157 }
158 
159 static void
160 enter_udp(void *xig)
161 {
162 	struct xinpcb *xinp = (struct xinpcb *)xig;
163 	struct xsocket *xso;
164 
165 	if (xinp->xi_len < sizeof(*xinp))
166 		return;
167 	xso = &xinp->xi_socket;
168 	enter(&xinp->xi_inp, xso, 0, "udp");
169 }
170 
171 static void
172 fetchnetstat_proto(void (*enter_proto)(void *),
173     const char *mibvar)
174 {
175 	char *buf, *buf2;
176 	size_t i, len, elem_len;
177 
178 	if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
179 		if (errno != ENOENT)
180 			warn("sysctl: %s", mibvar);
181 		return;
182 	}
183 	if ((buf = malloc(len)) == NULL) {
184 		warn("malloc %lu bytes", (u_long)len);
185 		return;
186 	}
187 	if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
188 		warn("sysctl: %s", mibvar);
189 		free(buf);
190 		return;
191 	}
192 
193 	/*
194 	 * XXX this is better with a single PCB type
195 	 */
196 	if (len == 0) {
197 		free(buf);
198 		return;
199 	}
200 	if (len < sizeof(size_t)) {
201 		warnx("sysctl: short read");
202 		free(buf);
203 		return;
204 	}
205 	elem_len = *(size_t *)buf;
206 	len /= elem_len;
207 	buf2 = buf;
208 	for (i = 0; i < len; i++, buf2 += elem_len) {
209 		if (*(size_t *)(buf2) != elem_len) {
210 			warn("sysctl: inconsistent PCB len");
211 			free(buf);
212 			return;
213 		}
214 		enter_proto(buf2);
215 	}
216 	free(buf);
217 }
218 
219 void
220 fetchnetstat(void)
221 {
222 	struct netinfo *p;
223 
224 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
225 		p->ni_seen = 0;
226 	if (protos & TCP)
227 		fetchnetstat_proto(enter_tcp, "net.inet.tcp.pcblist");
228 	if (protos & UDP)
229 		fetchnetstat_proto(enter_udp, "net.inet.udp.pcblist");
230 }
231 
232 static void
233 enter(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
234 {
235 	struct netinfo *p;
236 
237 	if (!aflag && inet_lnaof(inp->inp_laddr) == INADDR_ANY)
238 		return;
239 	if (nhosts && !checkhost(inp))
240 		return;
241 	if (nports && !checkport(inp))
242 		return;
243 	/*
244 	 * pcblist may return non-ipv4 sockets, but at the moment
245 	 * -netstat code doesn't support other than ipv4.
246 	 */
247 	if ((inp->inp_vflag & INP_IPV4) == 0)
248 		return;
249 	/*
250 	 * Only take exact matches, any sockets with
251 	 * previously unbound addresses will be deleted
252 	 * below in the display routine because they
253 	 * will appear as ``not seen'' in the kernel
254 	 * data structures.
255 	 */
256 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
257 		if (!streq(proto, p->ni_proto))
258 			continue;
259 		if (p->ni_lport != inp->inp_lport ||
260 		    p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
261 			continue;
262 		if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
263 		    p->ni_fport == inp->inp_fport)
264 			break;
265 	}
266 	if (p == (struct netinfo *)&netcb) {
267 		if ((p = malloc(sizeof(*p))) == NULL) {
268 			error("Out of memory");
269 			return;
270 		}
271 		p->ni_prev = (struct netinfo *)&netcb;
272 		p->ni_forw = netcb.ni_forw;
273 		netcb.ni_forw->ni_prev = p;
274 		netcb.ni_forw = p;
275 		p->ni_line = -1;
276 		p->ni_laddr = inp->inp_laddr;
277 		p->ni_lport = inp->inp_lport;
278 		p->ni_faddr = inp->inp_faddr;
279 		p->ni_fport = inp->inp_fport;
280 		p->ni_proto = proto;
281 		p->ni_flags = NIF_LACHG|NIF_FACHG;
282 	}
283 	p->ni_rcvcc = so->so_rcv.sb_cc;
284 	p->ni_sndcc = so->so_snd.sb_cc;
285 	p->ni_state = state;
286 	p->ni_seen = 1;
287 }
288 
289 /* column locations */
290 #define	LADDR	0
291 #define	FADDR	LADDR+22
292 #define	CPUID	FADDR+22
293 #define	PROTO	CPUID+4
294 #define	RCVCC	PROTO+6
295 #define	SNDCC	RCVCC+7
296 #define	STATE	SNDCC+7
297 
298 
299 void
300 labelnetstat(void)
301 {
302 	wmove(wnd, 0, 0); wclrtobot(wnd);
303 	mvwaddstr(wnd, 0, LADDR, "Local Address");
304 	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
305 	mvwaddstr(wnd, 0, PROTO, "Proto");
306 	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
307 	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
308 	mvwaddstr(wnd, 0, STATE, "(state)");
309 }
310 
311 void
312 shownetstat(void)
313 {
314 	struct netinfo *p, *q;
315 
316 	/*
317 	 * First, delete any connections that have gone
318 	 * away and adjust the position of connections
319 	 * below to reflect the deleted line.
320 	 */
321 	p = netcb.ni_forw;
322 	while (p != (struct netinfo *)&netcb) {
323 		if (p->ni_line == -1 || p->ni_seen) {
324 			p = p->ni_forw;
325 			continue;
326 		}
327 		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
328 		q = netcb.ni_forw;
329 		for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
330 			if (q != p && q->ni_line > p->ni_line) {
331 				q->ni_line--;
332 				/* this shouldn't be necessary */
333 				q->ni_flags |= NIF_LACHG|NIF_FACHG;
334 			}
335 		lastrow--;
336 		q = p->ni_forw;
337 		p->ni_prev->ni_forw = p->ni_forw;
338 		p->ni_forw->ni_prev = p->ni_prev;
339 		free(p);
340 		p = q;
341 	}
342 	/*
343 	 * Update existing connections and add new ones.
344 	 */
345 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
346 		if (p->ni_line == -1) {
347 			/*
348 			 * Add a new entry if possible.
349 			 */
350 			if (lastrow > YMAX(wnd))
351 				continue;
352 			p->ni_line = lastrow++;
353 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
354 		}
355 		if (p->ni_flags & NIF_LACHG) {
356 			wmove(wnd, p->ni_line, LADDR);
357 			inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
358 			p->ni_flags &= ~NIF_LACHG;
359 		}
360 		if (p->ni_flags & NIF_FACHG) {
361 			wmove(wnd, p->ni_line, FADDR);
362 			inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
363 			p->ni_flags &= ~NIF_FACHG;
364 		}
365 		mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
366 		mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
367 		mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
368 		if (streq(p->ni_proto, "tcp")) {
369 			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
370 				mvwprintw(wnd, p->ni_line, STATE, "%d",
371 				    p->ni_state);
372 			else
373 				mvwaddstr(wnd, p->ni_line, STATE,
374 				    tcpstates[p->ni_state]);
375 		}
376 		wclrtoeol(wnd);
377 	}
378 	if (lastrow < YMAX(wnd)) {
379 		wmove(wnd, lastrow, 0); wclrtobot(wnd);
380 		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
381 	}
382 }
383 
384 /*
385  * Pretty print an Internet address (net address + port).
386  * If the nflag was specified, use numbers instead of names.
387  */
388 static void
389 inetprint(struct in_addr *in, int port, const char *proto)
390 {
391 	struct servent *sp = NULL;
392 	char line[80], *cp;
393 
394 	snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
395 	cp = strchr(line, '\0');
396 	if (!nflag && port)
397 		sp = getservbyport(port, proto);
398 	if (sp || port == 0)
399 		snprintf(cp, sizeof(line) - (cp - line), "%.8s",
400 		    sp ? sp->s_name : "*");
401 	else
402 		snprintf(cp, sizeof(line) - (cp - line), "%d",
403 		    ntohs((u_short)port));
404 	/* pad to full column to clear any garbage */
405 	cp = strchr(line, '\0');
406 	while (cp - line < 22)
407 		*cp++ = ' ';
408 	line[22] = '\0';
409 	waddstr(wnd, line);
410 }
411 
412 /*
413  * Construct an Internet address representation.
414  * If the nflag has been supplied, give
415  * numeric value, otherwise try for symbolic name.
416  */
417 static char *
418 inetname(struct in_addr in)
419 {
420 	char *cp = NULL;
421 	static char line[50];
422 	struct hostent *hp;
423 	struct netent *np;
424 
425 	if (!nflag && in.s_addr != INADDR_ANY) {
426 		int net = inet_netof(in);
427 		int lna = inet_lnaof(in);
428 
429 		if (lna == INADDR_ANY) {
430 			np = getnetbyaddr(net, AF_INET);
431 			if (np)
432 				cp = np->n_name;
433 		}
434 		if (cp == NULL) {
435 			hp = gethostbyaddr(&in, sizeof (in), AF_INET);
436 			if (hp)
437 				cp = hp->h_name;
438 		}
439 	}
440 	if (in.s_addr == INADDR_ANY)
441 		strcpy(line, "*");
442 	else if (cp)
443 		snprintf(line, sizeof(line), "%s", cp);
444 	else {
445 		in.s_addr = ntohl(in.s_addr);
446 #define C(x)	((x) & 0xff)
447 		snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
448 			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
449 	}
450 	return (line);
451 }
452 
453 int
454 cmdnetstat(const char *cmd, char *args)
455 {
456 	struct netinfo *p;
457 
458 	if (prefix(cmd, "all")) {
459 		aflag = !aflag;
460 		goto fixup;
461 	}
462 	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
463 		int new;
464 
465 		new = prefix(cmd, "numbers");
466 		if (new == nflag)
467 			return (1);
468 		p = netcb.ni_forw;
469 		for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
470 			if (p->ni_line == -1)
471 				continue;
472 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
473 		}
474 		nflag = new;
475 		goto redisplay;
476 	}
477 	if (!netcmd(cmd, args))
478 		return (0);
479 fixup:
480 	fetchnetstat();
481 redisplay:
482 	shownetstat();
483 	refresh();
484 	return (1);
485 }
486