xref: /dragonfly/usr.bin/systat/netstat.c (revision 984263bc) 
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 
34 #ifndef lint
35 /*
36 static char sccsid[] = "@(#)netstat.c	8.1 (Berkeley) 6/6/93";
37 */
38 static const char rcsid[] =
39   "$FreeBSD: src/usr.bin/systat/netstat.c,v 1.13 1999/08/30 08:18:08 peter Exp $";
40 #endif /* not lint */
41 
42 /*
43  * netstat
44  */
45 #include <sys/param.h>
46 #include <sys/queue.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/protosw.h>
50 
51 #include <netinet/in.h>
52 #include <arpa/inet.h>
53 #include <net/route.h>
54 #include <netinet/in_systm.h>
55 #include <netinet/ip.h>
56 #include <netinet/in_pcb.h>
57 #include <netinet/ip_icmp.h>
58 #include <netinet/icmp_var.h>
59 #include <netinet/ip_var.h>
60 #include <netinet/tcp.h>
61 #include <netinet/tcpip.h>
62 #include <netinet/tcp_seq.h>
63 #define TCPSTATES
64 #include <netinet/tcp_fsm.h>
65 #include <netinet/tcp_timer.h>
66 #include <netinet/tcp_var.h>
67 #include <netinet/tcp_debug.h>
68 #include <netinet/udp.h>
69 #include <netinet/udp_var.h>
70 
71 #include <netdb.h>
72 #include <stdlib.h>
73 #include <string.h>
74 #include <nlist.h>
75 #include <paths.h>
76 #include "systat.h"
77 #include "extern.h"
78 
79 static void enter __P((struct inpcb *, struct socket *, int, char *));
80 static char *inetname __P((struct in_addr));
81 static void inetprint __P((struct in_addr *, int, char *));
82 
83 #define	streq(a,b)	(strcmp(a,b)==0)
84 #define	YMAX(w)		((w)->_maxy-1)
85 
86 WINDOW *
87 opennetstat()
88 {
89 	sethostent(1);
90 	setnetent(1);
91 	return (subwin(stdscr, LINES-5-1, 0, 5, 0));
92 }
93 
94 struct netinfo {
95 	struct	netinfo *ni_forw, *ni_prev;
96 	short	ni_line;		/* line on screen */
97 	short	ni_seen;		/* 0 when not present in list */
98 	short	ni_flags;
99 #define	NIF_LACHG	0x1		/* local address changed */
100 #define	NIF_FACHG	0x2		/* foreign address changed */
101 	short	ni_state;		/* tcp state */
102 	char	*ni_proto;		/* protocol */
103 	struct	in_addr ni_laddr;	/* local address */
104 	long	ni_lport;		/* local port */
105 	struct	in_addr	ni_faddr;	/* foreign address */
106 	long	ni_fport;		/* foreign port */
107 	long	ni_rcvcc;		/* rcv buffer character count */
108 	long	ni_sndcc;		/* snd buffer character count */
109 };
110 
111 static struct {
112 	struct	netinfo *ni_forw, *ni_prev;
113 } netcb;
114 
115 static	int aflag = 0;
116 static	int nflag = 0;
117 static	int lastrow = 1;
118 static	void enter(), inetprint();
119 static	char *inetname();
120 
121 void
122 closenetstat(w)
123         WINDOW *w;
124 {
125 	register struct netinfo *p;
126 
127 	endhostent();
128 	endnetent();
129 	p = (struct netinfo *)netcb.ni_forw;
130 	while (p != (struct netinfo *)&netcb) {
131 		if (p->ni_line != -1)
132 			lastrow--;
133 		p->ni_line = -1;
134 		p = p->ni_forw;
135 	}
136         if (w != NULL) {
137 		wclear(w);
138 		wrefresh(w);
139 		delwin(w);
140 	}
141 }
142 
143 static struct nlist namelist[] = {
144 #define	X_TCB	0
145 	{ "_tcb" },
146 #define	X_UDB	1
147 	{ "_udb" },
148 	{ "" },
149 };
150 
151 int
152 initnetstat()
153 {
154 	if (kvm_nlist(kd, namelist)) {
155 		nlisterr(namelist);
156 		return(0);
157 	}
158 	if (namelist[X_TCB].n_value == 0) {
159 		error("No symbols in namelist");
160 		return(0);
161 	}
162 	netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
163 	protos = TCP|UDP;
164 	return(1);
165 }
166 
167 void
168 fetchnetstat()
169 {
170 	register struct inpcb *next;
171 	register struct netinfo *p;
172 	struct inpcbhead head;
173 	struct inpcb inpcb;
174 	struct socket sockb;
175 	struct tcpcb tcpcb;
176 	void *off;
177 	int istcp;
178 
179 	if (namelist[X_TCB].n_value == 0)
180 		return;
181 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
182 		p->ni_seen = 0;
183 	if (protos&TCP) {
184 		off = NPTR(X_TCB);
185 		istcp = 1;
186 	}
187 	else if (protos&UDP) {
188 		off = NPTR(X_UDB);
189 		istcp = 0;
190 	}
191 	else {
192 		error("No protocols to display");
193 		return;
194 	}
195 again:
196 	KREAD(off, &head, sizeof (struct inpcbhead));
197 	for (next = head.lh_first; next != NULL; next = inpcb.inp_list.le_next) {
198 		KREAD(next, &inpcb, sizeof (inpcb));
199 		if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
200 			continue;
201 		if (nhosts && !checkhost(&inpcb))
202 			continue;
203 		if (nports && !checkport(&inpcb))
204 			continue;
205 		KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
206 		if (istcp) {
207 			KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
208 			enter(&inpcb, &sockb, tcpcb.t_state, "tcp");
209 		} else
210 			enter(&inpcb, &sockb, 0, "udp");
211 	}
212 	if (istcp && (protos&UDP)) {
213 		istcp = 0;
214 		off = NPTR(X_UDB);
215 		goto again;
216 	}
217 }
218 
219 static void
220 enter(inp, so, state, proto)
221 	register struct inpcb *inp;
222 	register struct socket *so;
223 	int state;
224 	char *proto;
225 {
226 	register struct netinfo *p;
227 
228 	/*
229 	 * Only take exact matches, any sockets with
230 	 * previously unbound addresses will be deleted
231 	 * below in the display routine because they
232 	 * will appear as ``not seen'' in the kernel
233 	 * data structures.
234 	 */
235 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
236 		if (!streq(proto, p->ni_proto))
237 			continue;
238 		if (p->ni_lport != inp->inp_lport ||
239 		    p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
240 			continue;
241 		if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
242 		    p->ni_fport == inp->inp_fport)
243 			break;
244 	}
245 	if (p == (struct netinfo *)&netcb) {
246 		if ((p = malloc(sizeof(*p))) == NULL) {
247 			error("Out of memory");
248 			return;
249 		}
250 		p->ni_prev = (struct netinfo *)&netcb;
251 		p->ni_forw = netcb.ni_forw;
252 		netcb.ni_forw->ni_prev = p;
253 		netcb.ni_forw = p;
254 		p->ni_line = -1;
255 		p->ni_laddr = inp->inp_laddr;
256 		p->ni_lport = inp->inp_lport;
257 		p->ni_faddr = inp->inp_faddr;
258 		p->ni_fport = inp->inp_fport;
259 		p->ni_proto = proto;
260 		p->ni_flags = NIF_LACHG|NIF_FACHG;
261 	}
262 	p->ni_rcvcc = so->so_rcv.sb_cc;
263 	p->ni_sndcc = so->so_snd.sb_cc;
264 	p->ni_state = state;
265 	p->ni_seen = 1;
266 }
267 
268 /* column locations */
269 #define	LADDR	0
270 #define	FADDR	LADDR+23
271 #define	PROTO	FADDR+23
272 #define	RCVCC	PROTO+6
273 #define	SNDCC	RCVCC+7
274 #define	STATE	SNDCC+7
275 
276 
277 void
278 labelnetstat()
279 {
280 	if (namelist[X_TCB].n_type == 0)
281 		return;
282 	wmove(wnd, 0, 0); wclrtobot(wnd);
283 	mvwaddstr(wnd, 0, LADDR, "Local Address");
284 	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
285 	mvwaddstr(wnd, 0, PROTO, "Proto");
286 	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
287 	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
288 	mvwaddstr(wnd, 0, STATE, "(state)");
289 }
290 
291 void
292 shownetstat()
293 {
294 	register struct netinfo *p, *q;
295 
296 	/*
297 	 * First, delete any connections that have gone
298 	 * away and adjust the position of connections
299 	 * below to reflect the deleted line.
300 	 */
301 	p = netcb.ni_forw;
302 	while (p != (struct netinfo *)&netcb) {
303 		if (p->ni_line == -1 || p->ni_seen) {
304 			p = p->ni_forw;
305 			continue;
306 		}
307 		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
308 		q = netcb.ni_forw;
309 		for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
310 			if (q != p && q->ni_line > p->ni_line) {
311 				q->ni_line--;
312 				/* this shouldn't be necessary */
313 				q->ni_flags |= NIF_LACHG|NIF_FACHG;
314 			}
315 		lastrow--;
316 		q = p->ni_forw;
317 		p->ni_prev->ni_forw = p->ni_forw;
318 		p->ni_forw->ni_prev = p->ni_prev;
319 		free(p);
320 		p = q;
321 	}
322 	/*
323 	 * Update existing connections and add new ones.
324 	 */
325 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
326 		if (p->ni_line == -1) {
327 			/*
328 			 * Add a new entry if possible.
329 			 */
330 			if (lastrow > YMAX(wnd))
331 				continue;
332 			p->ni_line = lastrow++;
333 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
334 		}
335 		if (p->ni_flags & NIF_LACHG) {
336 			wmove(wnd, p->ni_line, LADDR);
337 			inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
338 			p->ni_flags &= ~NIF_LACHG;
339 		}
340 		if (p->ni_flags & NIF_FACHG) {
341 			wmove(wnd, p->ni_line, FADDR);
342 			inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
343 			p->ni_flags &= ~NIF_FACHG;
344 		}
345 		mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
346 		mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
347 		mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
348 		if (streq(p->ni_proto, "tcp"))
349 			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
350 				mvwprintw(wnd, p->ni_line, STATE, "%d",
351 				    p->ni_state);
352 			else
353 				mvwaddstr(wnd, p->ni_line, STATE,
354 				    tcpstates[p->ni_state]);
355 		wclrtoeol(wnd);
356 	}
357 	if (lastrow < YMAX(wnd)) {
358 		wmove(wnd, lastrow, 0); wclrtobot(wnd);
359 		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
360 	}
361 }
362 
363 /*
364  * Pretty print an Internet address (net address + port).
365  * If the nflag was specified, use numbers instead of names.
366  */
367 static void
368 inetprint(in, port, proto)
369 	register struct in_addr *in;
370 	int port;
371 	char *proto;
372 {
373 	struct servent *sp = 0;
374 	char line[80], *cp, *index();
375 
376 	snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
377 	cp = index(line, '\0');
378 	if (!nflag && port)
379 		sp = getservbyport(port, proto);
380 	if (sp || port == 0)
381 		snprintf(cp, sizeof(line) - (cp - line), "%.8s",
382 		    sp ? sp->s_name : "*");
383 	else
384 		snprintf(cp, sizeof(line) - (cp - line), "%d",
385 		    ntohs((u_short)port));
386 	/* pad to full column to clear any garbage */
387 	cp = index(line, '\0');
388 	while (cp - line < 22)
389 		*cp++ = ' ';
390 	line[22] = '\0';
391 	waddstr(wnd, line);
392 }
393 
394 /*
395  * Construct an Internet address representation.
396  * If the nflag has been supplied, give
397  * numeric value, otherwise try for symbolic name.
398  */
399 static char *
400 inetname(in)
401 	struct in_addr in;
402 {
403 	char *cp = 0;
404 	static char line[50];
405 	struct hostent *hp;
406 	struct netent *np;
407 
408 	if (!nflag && in.s_addr != INADDR_ANY) {
409 		int net = inet_netof(in);
410 		int lna = inet_lnaof(in);
411 
412 		if (lna == INADDR_ANY) {
413 			np = getnetbyaddr(net, AF_INET);
414 			if (np)
415 				cp = np->n_name;
416 		}
417 		if (cp == 0) {
418 			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
419 			if (hp)
420 				cp = hp->h_name;
421 		}
422 	}
423 	if (in.s_addr == INADDR_ANY)
424 		strcpy(line, "*");
425 	else if (cp)
426 		snprintf(line, sizeof(line), "%s", cp);
427 	else {
428 		in.s_addr = ntohl(in.s_addr);
429 #define C(x)	((x) & 0xff)
430 		snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
431 			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
432 	}
433 	return (line);
434 }
435 
436 int
437 cmdnetstat(cmd, args)
438 	char *cmd, *args;
439 {
440 	register struct netinfo *p;
441 
442 	if (prefix(cmd, "all")) {
443 		aflag = !aflag;
444 		goto fixup;
445 	}
446 	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
447 		int new;
448 
449 		new = prefix(cmd, "numbers");
450 		if (new == nflag)
451 			return (1);
452 		p = netcb.ni_forw;
453 		for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
454 			if (p->ni_line == -1)
455 				continue;
456 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
457 		}
458 		nflag = new;
459 		goto redisplay;
460 	}
461 	if (!netcmd(cmd, args))
462 		return (0);
463 fixup:
464 	fetchnetstat();
465 redisplay:
466 	shownetstat();
467 	refresh();
468 	return (1);
469 }
470