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 *
opennetstat(void)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
closenetstat(WINDOW * w)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
initnetstat(void)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
enter_tcp(void * xig)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
enter_udp(void * xig)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
fetchnetstat_proto(void (* enter_proto)(void *),const char * mibvar)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
fetchnetstat(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
enter(struct inpcb * inp,struct xsocket * so,int state,const char * proto)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_ISIPV4(inp))
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
labelnetstat(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
shownetstat(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
inetprint(struct in_addr * in,int port,const char * proto)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 *
inetname(struct in_addr in)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
cmdnetstat(const char * cmd,char * args)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