netstat.c revision 118318 
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#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/systat/netstat.c 118318 2003-08-01 20:28:20Z dwmalone $");
37
38#ifdef lint
39static const char sccsid[] = "@(#)netstat.c	8.1 (Berkeley) 6/6/93";
40#endif
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#ifdef INET6
57#include <netinet/ip6.h>
58#endif
59#include <netinet/in_pcb.h>
60#include <netinet/ip_icmp.h>
61#include <netinet/icmp_var.h>
62#include <netinet/ip_var.h>
63#include <netinet/tcp.h>
64#include <netinet/tcpip.h>
65#include <netinet/tcp_seq.h>
66#include <netinet/tcp_var.h>
67#define TCPSTATES
68#include <netinet/tcp_fsm.h>
69#include <netinet/tcp_timer.h>
70#include <netinet/tcp_var.h>
71#include <netinet/tcp_debug.h>
72#include <netinet/udp.h>
73#include <netinet/udp_var.h>
74
75#include <netdb.h>
76#include <nlist.h>
77#include <paths.h>
78#include <stdlib.h>
79#include <string.h>
80
81#include "systat.h"
82#include "extern.h"
83
84static struct netinfo *enter(struct inpcb *, int, const char *);
85static void enter_kvm(struct inpcb *, struct socket *, int, const char *);
86static void enter_sysctl(struct inpcb *, struct xsocket *, int, const char *);
87static void fetchnetstat_kvm(void);
88static void fetchnetstat_sysctl(void);
89static char *inetname(struct in_addr);
90static void inetprint(struct in_addr *, int, const char *);
91
92#define	streq(a,b)	(strcmp(a,b)==0)
93#define	YMAX(w)		((w)->_maxy-1)
94
95WINDOW *
96opennetstat()
97{
98	sethostent(1);
99	setnetent(1);
100	return (subwin(stdscr, LINES-5-1, 0, 5, 0));
101}
102
103struct netinfo {
104	TAILQ_ENTRY(netinfo) chain;
105	short	ni_line;		/* line on screen */
106	short	ni_seen;		/* 0 when not present in list */
107	short	ni_flags;
108#define	NIF_LACHG	0x1		/* local address changed */
109#define	NIF_FACHG	0x2		/* foreign address changed */
110	short	ni_state;		/* tcp state */
111	const char	*ni_proto;		/* protocol */
112	struct	in_addr ni_laddr;	/* local address */
113	long	ni_lport;		/* local port */
114	struct	in_addr	ni_faddr;	/* foreign address */
115	long	ni_fport;		/* foreign port */
116	u_int	ni_rcvcc;		/* rcv buffer character count */
117	u_int	ni_sndcc;		/* snd buffer character count */
118};
119
120TAILQ_HEAD(netinfohead, netinfo) netcb = TAILQ_HEAD_INITIALIZER(netcb);
121
122static	int aflag = 0;
123static	int nflag = 0;
124static	int lastrow = 1;
125
126void
127closenetstat(w)
128        WINDOW *w;
129{
130	struct netinfo *p;
131
132	endhostent();
133	endnetent();
134	TAILQ_FOREACH(p, &netcb, chain) {
135		if (p->ni_line != -1)
136			lastrow--;
137		p->ni_line = -1;
138	}
139        if (w != NULL) {
140		wclear(w);
141		wrefresh(w);
142		delwin(w);
143	}
144}
145
146static const char *miblist[] = {
147	"net.inet.tcp.pcblist",
148	"net.inet.udp.pcblist"
149};
150
151struct nlist namelist[] = {
152#define	X_TCB	0
153	{ "tcb" },
154#define	X_UDB	1
155	{ "udb" },
156	{ "" },
157};
158
159int
160initnetstat()
161{
162	protos = TCP|UDP;
163	return(1);
164}
165
166void
167fetchnetstat()
168{
169	if (use_kvm)
170		fetchnetstat_kvm();
171	else
172		fetchnetstat_sysctl();
173}
174
175static void
176fetchnetstat_kvm()
177{
178	struct inpcb *next;
179	struct netinfo *p;
180	struct inpcbhead head;
181	struct inpcb inpcb;
182	struct socket sockb;
183	struct tcpcb tcpcb;
184	void *off;
185	int istcp;
186
187	if (namelist[X_TCB].n_value == 0)
188		return;
189	TAILQ_FOREACH(p, &netcb, chain)
190		p->ni_seen = 0;
191	if (protos&TCP) {
192		off = NPTR(X_TCB);
193		istcp = 1;
194	}
195	else if (protos&UDP) {
196		off = NPTR(X_UDB);
197		istcp = 0;
198	}
199	else {
200		error("No protocols to display");
201		return;
202	}
203again:
204	KREAD(off, &head, sizeof (struct inpcbhead));
205	LIST_FOREACH(next, &head, inp_list) {
206		KREAD(next, &inpcb, sizeof (inpcb));
207		next = &inpcb;
208		if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
209			continue;
210		if (nhosts && !checkhost(&inpcb))
211			continue;
212		if (nports && !checkport(&inpcb))
213			continue;
214		KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
215		if (istcp) {
216			KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
217			enter_kvm(&inpcb, &sockb, tcpcb.t_state, "tcp");
218		} else
219			enter_kvm(&inpcb, &sockb, 0, "udp");
220	}
221	if (istcp && (protos&UDP)) {
222		istcp = 0;
223		off = NPTR(X_UDB);
224		goto again;
225	}
226}
227
228static void
229fetchnetstat_sysctl()
230{
231	struct netinfo *p;
232	int idx;
233	struct xinpgen *inpg;
234	char *cur, *end;
235	struct inpcb *inpcb;
236	struct xinpcb *xip;
237	struct xtcpcb *xtp;
238	int plen;
239	size_t lsz;
240
241	TAILQ_FOREACH(p, &netcb, chain)
242		p->ni_seen = 0;
243	if (protos&TCP) {
244		idx = 0;
245	} else if (protos&UDP) {
246		idx = 1;
247	} else {
248		error("No protocols to display");
249		return;
250	}
251
252	for (;idx < 2; idx++) {
253		if (idx == 1 && !(protos&UDP))
254			break;
255		inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
256		if (inpg == NULL) {
257			error("sysctl(%s...) failed", miblist[idx]);
258			continue;
259		}
260		/*
261		 * We currently do no require a consistent pcb list.
262		 * Try to be robust in case of struct size changes
263		 */
264		cur = ((char *)inpg) + inpg->xig_len;
265		/* There is also a trailing struct xinpgen */
266		end = ((char *)inpg) + lsz - inpg->xig_len;
267		if (end <= cur) {
268			free(inpg);
269			continue;
270		}
271		if (idx == 0) { /* TCP */
272			xtp = (struct xtcpcb *)cur;
273			plen = xtp->xt_len;
274		} else {
275			xip = (struct xinpcb *)cur;
276			plen = xip->xi_len;
277		}
278		while (cur + plen <= end) {
279			if (idx == 0) { /* TCP */
280				xtp = (struct xtcpcb *)cur;
281				inpcb = &xtp->xt_inp;
282			} else {
283				xip = (struct xinpcb *)cur;
284				inpcb = &xip->xi_inp;
285			}
286			cur += plen;
287
288			if (!aflag && inet_lnaof(inpcb->inp_laddr) ==
289			    INADDR_ANY)
290				continue;
291			if (nhosts && !checkhost(inpcb))
292				continue;
293			if (nports && !checkport(inpcb))
294				continue;
295			if (idx == 0)	/* TCP */
296				enter_sysctl(inpcb, &xtp->xt_socket,
297				    xtp->xt_tp.t_state, "tcp");
298			else		/* UDP */
299				enter_sysctl(inpcb, &xip->xi_socket, 0, "udp");
300		}
301		free(inpg);
302	}
303}
304
305static void
306enter_kvm(inp, so, state, proto)
307	struct inpcb *inp;
308	struct socket *so;
309	int state;
310	const char *proto;
311{
312	struct netinfo *p;
313
314	if ((p = enter(inp, state, proto)) != NULL) {
315		p->ni_rcvcc = so->so_rcv.sb_cc;
316		p->ni_sndcc = so->so_snd.sb_cc;
317	}
318}
319
320static void
321enter_sysctl(inp, so, state, proto)
322	struct inpcb *inp;
323	struct xsocket *so;
324	int state;
325	const char *proto;
326{
327	struct netinfo *p;
328
329	if ((p = enter(inp, state, proto)) != NULL) {
330		p->ni_rcvcc = so->so_rcv.sb_cc;
331		p->ni_sndcc = so->so_snd.sb_cc;
332	}
333}
334
335
336static struct netinfo *
337enter(inp, state, proto)
338	struct inpcb *inp;
339	int state;
340	const char *proto;
341{
342	struct netinfo *p;
343
344	/*
345	 * Only take exact matches, any sockets with
346	 * previously unbound addresses will be deleted
347	 * below in the display routine because they
348	 * will appear as ``not seen'' in the kernel
349	 * data structures.
350	 */
351	TAILQ_FOREACH(p, &netcb, chain) {
352		if (!streq(proto, p->ni_proto))
353			continue;
354		if (p->ni_lport != inp->inp_lport ||
355		    p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
356			continue;
357		if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
358		    p->ni_fport == inp->inp_fport)
359			break;
360	}
361	if (p == NULL) {
362		if ((p = malloc(sizeof(*p))) == NULL) {
363			error("Out of memory");
364			return NULL;
365		}
366		TAILQ_INSERT_HEAD(&netcb, p, chain);
367		p->ni_line = -1;
368		p->ni_laddr = inp->inp_laddr;
369		p->ni_lport = inp->inp_lport;
370		p->ni_faddr = inp->inp_faddr;
371		p->ni_fport = inp->inp_fport;
372		p->ni_proto = strdup(proto);
373		p->ni_flags = NIF_LACHG|NIF_FACHG;
374	}
375	p->ni_state = state;
376	p->ni_seen = 1;
377	return p;
378}
379
380/* column locations */
381#define	LADDR	0
382#define	FADDR	LADDR+23
383#define	PROTO	FADDR+23
384#define	RCVCC	PROTO+6
385#define	SNDCC	RCVCC+7
386#define	STATE	SNDCC+7
387
388
389void
390labelnetstat()
391{
392	if (use_kvm && namelist[X_TCB].n_type == 0)
393		return;
394	wmove(wnd, 0, 0); wclrtobot(wnd);
395	mvwaddstr(wnd, 0, LADDR, "Local Address");
396	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
397	mvwaddstr(wnd, 0, PROTO, "Proto");
398	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
399	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
400	mvwaddstr(wnd, 0, STATE, "(state)");
401}
402
403void
404shownetstat()
405{
406	struct netinfo *p, *q;
407
408	/*
409	 * First, delete any connections that have gone
410	 * away and adjust the position of connections
411	 * below to reflect the deleted line.
412	 */
413	p = TAILQ_FIRST(&netcb);
414	while (p != NULL) {
415		if (p->ni_line == -1 || p->ni_seen) {
416			p = TAILQ_NEXT(p, chain);
417			continue;
418		}
419		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
420		TAILQ_FOREACH(q, &netcb, chain)
421			if (q != p && q->ni_line > p->ni_line) {
422				q->ni_line--;
423				/* this shouldn't be necessary */
424				q->ni_flags |= NIF_LACHG|NIF_FACHG;
425			}
426		lastrow--;
427		q = TAILQ_NEXT(p, chain);
428		TAILQ_REMOVE(&netcb, p, chain);
429		free(p);
430		p = q;
431	}
432	/*
433	 * Update existing connections and add new ones.
434	 */
435	TAILQ_FOREACH(p, &netcb, chain) {
436		if (p->ni_line == -1) {
437			/*
438			 * Add a new entry if possible.
439			 */
440			if (lastrow > YMAX(wnd))
441				continue;
442			p->ni_line = lastrow++;
443			p->ni_flags |= NIF_LACHG|NIF_FACHG;
444		}
445		if (p->ni_flags & NIF_LACHG) {
446			wmove(wnd, p->ni_line, LADDR);
447			inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
448			p->ni_flags &= ~NIF_LACHG;
449		}
450		if (p->ni_flags & NIF_FACHG) {
451			wmove(wnd, p->ni_line, FADDR);
452			inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
453			p->ni_flags &= ~NIF_FACHG;
454		}
455		mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
456		mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
457		mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
458		if (streq(p->ni_proto, "tcp")) {
459			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
460				mvwprintw(wnd, p->ni_line, STATE, "%d",
461				    p->ni_state);
462			else
463				mvwaddstr(wnd, p->ni_line, STATE,
464				    tcpstates[p->ni_state]);
465		}
466		wclrtoeol(wnd);
467	}
468	if (lastrow < YMAX(wnd)) {
469		wmove(wnd, lastrow, 0); wclrtobot(wnd);
470		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
471	}
472}
473
474/*
475 * Pretty print an Internet address (net address + port).
476 * If the nflag was specified, use numbers instead of names.
477 */
478static void
479inetprint(in, port, proto)
480	struct in_addr *in;
481	int port;
482	const char *proto;
483{
484	struct servent *sp = 0;
485	char line[80], *cp;
486
487	snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
488	cp = index(line, '\0');
489	if (!nflag && port)
490		sp = getservbyport(port, proto);
491	if (sp || port == 0)
492		snprintf(cp, sizeof(line) - (cp - line), "%.8s",
493		    sp ? sp->s_name : "*");
494	else
495		snprintf(cp, sizeof(line) - (cp - line), "%d",
496		    ntohs((u_short)port));
497	/* pad to full column to clear any garbage */
498	cp = index(line, '\0');
499	while (cp - line < 22)
500		*cp++ = ' ';
501	line[22] = '\0';
502	waddstr(wnd, line);
503}
504
505/*
506 * Construct an Internet address representation.
507 * If the nflag has been supplied, give
508 * numeric value, otherwise try for symbolic name.
509 */
510static char *
511inetname(in)
512	struct in_addr in;
513{
514	char *cp = 0;
515	static char line[50];
516	struct hostent *hp;
517	struct netent *np;
518
519	if (!nflag && in.s_addr != INADDR_ANY) {
520		int net = inet_netof(in);
521		int lna = inet_lnaof(in);
522
523		if (lna == INADDR_ANY) {
524			np = getnetbyaddr(net, AF_INET);
525			if (np)
526				cp = np->n_name;
527		}
528		if (cp == 0) {
529			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
530			if (hp)
531				cp = hp->h_name;
532		}
533	}
534	if (in.s_addr == INADDR_ANY)
535		strcpy(line, "*");
536	else if (cp)
537		snprintf(line, sizeof(line), "%s", cp);
538	else {
539		in.s_addr = ntohl(in.s_addr);
540#define C(x)	((x) & 0xff)
541		snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
542			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
543	}
544	return (line);
545}
546
547int
548cmdnetstat(cmd, args)
549	const char *cmd, *args;
550{
551	if (prefix(cmd, "all")) {
552		aflag = !aflag;
553		goto fixup;
554	}
555	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
556		struct netinfo *p;
557		int new;
558
559		new = prefix(cmd, "numbers");
560		if (new == nflag)
561			return (1);
562		TAILQ_FOREACH(p, &netcb, chain) {
563			if (p->ni_line == -1)
564				continue;
565			p->ni_flags |= NIF_LACHG|NIF_FACHG;
566		}
567		nflag = new;
568		goto redisplay;
569	}
570	if (!netcmd(cmd, args))
571		return (0);
572fixup:
573	fetchnetstat();
574redisplay:
575	shownetstat();
576	refresh();
577	return (1);
578}
579