1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33
34 __FBSDID("$FreeBSD$");
35
36 #ifdef lint
37 static const char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93";
38 #endif
39
40 /*
41 * netstat
42 */
43 #include <sys/param.h>
44 #include <sys/queue.h>
45 #include <sys/socket.h>
46 #define _WANT_SOCKET
47 #include <sys/socketvar.h>
48 #include <sys/protosw.h>
49
50 #include <netinet/in.h>
51 #include <arpa/inet.h>
52 #include <net/route.h>
53 #include <netinet/in_systm.h>
54 #include <netinet/ip.h>
55 #ifdef INET6
56 #include <netinet/ip6.h>
57 #endif
58 #define _WANT_INPCB
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 #define TCPSTATES
67 #include <netinet/tcp_fsm.h>
68 #include <netinet/tcp_timer.h>
69 #define _WANT_TCPCB
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
84 static struct netinfo *enter(struct in_conninfo *, uint8_t, int, const char *);
85 static void enter_kvm(struct inpcb *, struct socket *, int, const char *);
86 static void enter_sysctl(struct xinpcb *, struct xsocket *, int, const char *);
87 static void fetchnetstat_kvm(void);
88 static void fetchnetstat_sysctl(void);
89 static char *inetname(struct sockaddr *);
90 static void inetprint(struct sockaddr *, const char *);
91
92 #define streq(a,b) (strcmp(a,b)==0)
93 #define YMAX(w) (getmaxy(w)-2)
94
95 WINDOW *
opennetstat(void)96 opennetstat(void)
97 {
98 sethostent(1);
99 setnetent(1);
100 return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
101 }
102
103 struct 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 sockaddr_storage ni_lsa; /* local address */
113 struct sockaddr_storage ni_fsa; /* foreign address */
114 u_int ni_rcvcc; /* rcv buffer character count */
115 u_int ni_sndcc; /* snd buffer character count */
116 };
117
118 TAILQ_HEAD(netinfohead, netinfo) netcb = TAILQ_HEAD_INITIALIZER(netcb);
119
120 static int aflag = 0;
121 static int nflag = 0;
122 static int lastrow = 1;
123
124 void
closenetstat(WINDOW * w)125 closenetstat(WINDOW *w)
126 {
127 struct netinfo *p;
128
129 endhostent();
130 endnetent();
131 TAILQ_FOREACH(p, &netcb, chain) {
132 if (p->ni_line != -1)
133 lastrow--;
134 p->ni_line = -1;
135 }
136 if (w != NULL) {
137 wclear(w);
138 wrefresh(w);
139 delwin(w);
140 }
141 }
142
143 static const char *miblist[] = {
144 "net.inet.tcp.pcblist",
145 "net.inet.udp.pcblist"
146 };
147
148 static char tcb[] = "tcb", udb[] = "udb";
149
150 struct nlist namelist[] = {
151 #define X_TCB 0
152 { .n_name = tcb },
153 #define X_UDB 1
154 { .n_name = udb },
155 { .n_name = NULL },
156 };
157
158 int
initnetstat(void)159 initnetstat(void)
160 {
161 protos = TCP|UDP;
162 return(1);
163 }
164
165 void
fetchnetstat(void)166 fetchnetstat(void)
167 {
168 if (use_kvm)
169 fetchnetstat_kvm();
170 else
171 fetchnetstat_sysctl();
172 }
173
174 static void
fetchnetstat_kvm(void)175 fetchnetstat_kvm(void)
176 {
177 struct inpcb *next;
178 struct netinfo *p;
179 struct inpcbhead head;
180 struct inpcb inpcb;
181 struct socket sockb;
182 struct tcpcb tcpcb;
183 void *off;
184 int istcp;
185
186 if (namelist[X_TCB].n_value == 0)
187 return;
188 TAILQ_FOREACH(p, &netcb, chain)
189 p->ni_seen = 0;
190 if (protos&TCP) {
191 off = NPTR(X_TCB);
192 istcp = 1;
193 }
194 else if (protos&UDP) {
195 off = NPTR(X_UDB);
196 istcp = 0;
197 }
198 else {
199 error("No protocols to display");
200 return;
201 }
202 again:
203 KREAD(off, &head, sizeof (struct inpcbhead));
204 LIST_FOREACH(next, &head, inp_list) {
205 KREAD(next, &inpcb, sizeof (inpcb));
206 next = &inpcb;
207 if (!aflag) {
208 if (inpcb.inp_vflag & INP_IPV4) {
209 if (inpcb.inp_laddr.s_addr == INADDR_ANY)
210 continue;
211 }
212 #ifdef INET6
213 else if (inpcb.inp_vflag & INP_IPV6) {
214 if (memcmp(&inpcb.in6p_laddr,
215 &in6addr_any, sizeof(in6addr_any)) == 0)
216 continue;
217 }
218 #endif
219 }
220 if (nhosts && !checkhost(&inpcb.inp_inc))
221 continue;
222 if (nports && !checkport(&inpcb.inp_inc))
223 continue;
224 if (istcp) {
225 if (inpcb.inp_flags & INP_TIMEWAIT) {
226 bzero(&sockb, sizeof(sockb));
227 enter_kvm(&inpcb, &sockb, TCPS_TIME_WAIT,
228 "tcp");
229 } else {
230 KREAD(inpcb.inp_socket, &sockb,
231 sizeof (sockb));
232 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
233 enter_kvm(&inpcb, &sockb, tcpcb.t_state,
234 "tcp");
235 }
236 } else
237 enter_kvm(&inpcb, &sockb, 0, "udp");
238 }
239 if (istcp && (protos&UDP)) {
240 istcp = 0;
241 off = NPTR(X_UDB);
242 goto again;
243 }
244 }
245
246 static void
fetchnetstat_sysctl(void)247 fetchnetstat_sysctl(void)
248 {
249 struct netinfo *p;
250 int idx;
251 struct xinpgen *inpg;
252 char *cur, *end;
253 struct xinpcb *xip = NULL;
254 struct xtcpcb *xtp = NULL;
255 int plen;
256 size_t lsz;
257
258 TAILQ_FOREACH(p, &netcb, chain)
259 p->ni_seen = 0;
260 if (protos&TCP) {
261 idx = 0;
262 } else if (protos&UDP) {
263 idx = 1;
264 } else {
265 error("No protocols to display");
266 return;
267 }
268
269 for (;idx < 2; idx++) {
270 if (idx == 1 && !(protos&UDP))
271 break;
272 inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
273 if (inpg == NULL) {
274 error("sysctl(%s...) failed", miblist[idx]);
275 continue;
276 }
277 /*
278 * We currently do no require a consistent pcb list.
279 * Try to be robust in case of struct size changes
280 */
281 cur = ((char *)inpg) + inpg->xig_len;
282 /* There is also a trailing struct xinpgen */
283 end = ((char *)inpg) + lsz - inpg->xig_len;
284 if (end <= cur) {
285 free(inpg);
286 continue;
287 }
288 if (idx == 0) { /* TCP */
289 xtp = (struct xtcpcb *)cur;
290 plen = xtp->xt_len;
291 } else {
292 xip = (struct xinpcb *)cur;
293 plen = xip->xi_len;
294 }
295 while (cur + plen <= end) {
296 if (idx == 0) { /* TCP */
297 xtp = (struct xtcpcb *)cur;
298 xip = &xtp->xt_inp;
299 } else {
300 xip = (struct xinpcb *)cur;
301 }
302 cur += plen;
303
304 if (!aflag) {
305 if (xip->inp_vflag & INP_IPV4) {
306 if (xip->inp_laddr.s_addr == INADDR_ANY)
307 continue;
308 }
309 #ifdef INET6
310 else if (xip->inp_vflag & INP_IPV6) {
311 if (memcmp(&xip->in6p_laddr,
312 &in6addr_any, sizeof(in6addr_any))
313 == 0)
314 continue;
315 }
316 #endif
317 }
318 if (nhosts && !checkhost(&xip->inp_inc))
319 continue;
320 if (nports && !checkport(&xip->inp_inc))
321 continue;
322 if (idx == 0)
323 enter_sysctl(xip, &xip->xi_socket,
324 xtp->t_state, "tcp");
325 else
326 enter_sysctl(xip, &xip->xi_socket, 0, "udp");
327 }
328 free(inpg);
329 }
330 }
331
332 static void
enter_kvm(struct inpcb * inp,struct socket * so,int state,const char * proto)333 enter_kvm(struct inpcb *inp, struct socket *so, int state, const char *proto)
334 {
335 struct netinfo *p;
336
337 if ((p = enter(&inp->inp_inc, inp->inp_vflag, state, proto)) != NULL) {
338 p->ni_rcvcc = so->so_rcv.sb_ccc;
339 p->ni_sndcc = so->so_snd.sb_ccc;
340 }
341 }
342
343 static void
enter_sysctl(struct xinpcb * xip,struct xsocket * so,int state,const char * proto)344 enter_sysctl(struct xinpcb *xip, struct xsocket *so, int state,
345 const char *proto)
346 {
347 struct netinfo *p;
348
349 if ((p = enter(&xip->inp_inc, xip->inp_vflag, state, proto)) != NULL) {
350 p->ni_rcvcc = so->so_rcv.sb_cc;
351 p->ni_sndcc = so->so_snd.sb_cc;
352 }
353 }
354
355 static struct netinfo *
enter(struct in_conninfo * inc,uint8_t vflag,int state,const char * proto)356 enter(struct in_conninfo *inc, uint8_t vflag, int state, const char *proto)
357 {
358 struct netinfo *p;
359 struct sockaddr_storage lsa, fsa;
360 struct sockaddr_in *sa4;
361 #ifdef INET6
362 struct sockaddr_in6 *sa6;
363 #endif
364
365 memset(&lsa, 0, sizeof(lsa));
366 memset(&fsa, 0, sizeof(fsa));
367 if (vflag & INP_IPV4) {
368 sa4 = (struct sockaddr_in *)&lsa;
369 sa4->sin_addr = inc->inc_laddr;
370 sa4->sin_port = inc->inc_lport;
371 sa4->sin_family = AF_INET;
372 sa4->sin_len = sizeof(struct sockaddr_in);
373
374 sa4 = (struct sockaddr_in *)&fsa;
375 sa4->sin_addr = inc->inc_faddr;
376 sa4->sin_port = inc->inc_fport;
377 sa4->sin_family = AF_INET;
378 sa4->sin_len = sizeof(struct sockaddr_in);
379 }
380 #ifdef INET6
381 else if (vflag & INP_IPV6) {
382 sa6 = (struct sockaddr_in6 *)&lsa;
383 memcpy(&sa6->sin6_addr, &inc->inc6_laddr,
384 sizeof(struct in6_addr));
385 sa6->sin6_port = inc->inc_lport;
386 sa6->sin6_family = AF_INET6;
387 sa6->sin6_len = sizeof(struct sockaddr_in6);
388
389 sa6 = (struct sockaddr_in6 *)&fsa;
390 memcpy(&sa6->sin6_addr, &inc->inc6_faddr,
391 sizeof(struct in6_addr));
392 sa6->sin6_port = inc->inc_fport;
393 sa6->sin6_family = AF_INET6;
394 sa6->sin6_len = sizeof(struct sockaddr_in6);
395 }
396 #endif
397 else
398 return NULL;
399
400 /*
401 * Only take exact matches, any sockets with
402 * previously unbound addresses will be deleted
403 * below in the display routine because they
404 * will appear as ``not seen'' in the kernel
405 * data structures.
406 */
407 TAILQ_FOREACH(p, &netcb, chain) {
408 if (!streq(proto, p->ni_proto))
409 continue;
410 if (p->ni_lsa.ss_family != lsa.ss_family ||
411 memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
412 continue;
413 if (p->ni_fsa.ss_family == fsa.ss_family &&
414 memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
415 break;
416 }
417 if (p == NULL) {
418 if ((p = malloc(sizeof(*p))) == NULL) {
419 error("Out of memory");
420 return NULL;
421 }
422 TAILQ_INSERT_HEAD(&netcb, p, chain);
423 p->ni_line = -1;
424 memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
425 memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
426 p->ni_proto = strdup(proto);
427 p->ni_flags = NIF_LACHG|NIF_FACHG;
428 }
429 p->ni_state = state;
430 p->ni_seen = 1;
431 return p;
432 }
433
434 /* column locations */
435 #define LADDR 0
436 #define FADDR LADDR+23
437 #define PROTO FADDR+23
438 #define RCVCC PROTO+6
439 #define SNDCC RCVCC+7
440 #define STATE SNDCC+7
441
442 void
labelnetstat(void)443 labelnetstat(void)
444 {
445 if (use_kvm && namelist[X_TCB].n_type == 0)
446 return;
447 wmove(wnd, 0, 0); wclrtobot(wnd);
448 mvwaddstr(wnd, 0, LADDR, "Local Address");
449 mvwaddstr(wnd, 0, FADDR, "Foreign Address");
450 mvwaddstr(wnd, 0, PROTO, "Proto");
451 mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
452 mvwaddstr(wnd, 0, SNDCC, "Send-Q");
453 mvwaddstr(wnd, 0, STATE, "(state)");
454 }
455
456 void
shownetstat(void)457 shownetstat(void)
458 {
459 struct netinfo *p, *q;
460 char proto[6];
461 const char *family = "";
462
463 /*
464 * First, delete any connections that have gone
465 * away and adjust the position of connections
466 * below to reflect the deleted line.
467 */
468 p = TAILQ_FIRST(&netcb);
469 while (p != NULL) {
470 if (p->ni_line == -1 || p->ni_seen) {
471 p = TAILQ_NEXT(p, chain);
472 continue;
473 }
474 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
475 TAILQ_FOREACH(q, &netcb, chain)
476 if (q != p && q->ni_line > p->ni_line) {
477 q->ni_line--;
478 /* this shouldn't be necessary */
479 q->ni_flags |= NIF_LACHG|NIF_FACHG;
480 }
481 lastrow--;
482 q = TAILQ_NEXT(p, chain);
483 TAILQ_REMOVE(&netcb, p, chain);
484 free(p);
485 p = q;
486 }
487 /*
488 * Update existing connections and add new ones.
489 */
490 TAILQ_FOREACH(p, &netcb, chain) {
491 if (p->ni_line == -1) {
492 /*
493 * Add a new entry if possible.
494 */
495 if (lastrow > YMAX(wnd))
496 continue;
497 p->ni_line = lastrow++;
498 p->ni_flags |= NIF_LACHG|NIF_FACHG;
499 }
500 if (p->ni_flags & NIF_LACHG) {
501 wmove(wnd, p->ni_line, LADDR);
502 inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
503 p->ni_flags &= ~NIF_LACHG;
504 }
505 if (p->ni_flags & NIF_FACHG) {
506 wmove(wnd, p->ni_line, FADDR);
507 inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
508 p->ni_flags &= ~NIF_FACHG;
509 }
510 #ifdef INET6
511 family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
512 #endif
513 snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
514 mvwaddstr(wnd, p->ni_line, PROTO, proto);
515 mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
516 mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
517 if (streq(p->ni_proto, "tcp")) {
518 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
519 mvwprintw(wnd, p->ni_line, STATE, "%d",
520 p->ni_state);
521 else
522 mvwaddstr(wnd, p->ni_line, STATE,
523 tcpstates[p->ni_state]);
524 }
525 wclrtoeol(wnd);
526 }
527 if (lastrow < YMAX(wnd)) {
528 wmove(wnd, lastrow, 0); wclrtobot(wnd);
529 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */
530 }
531 }
532
533 /*
534 * Pretty print an Internet address (net address + port).
535 * If the nflag was specified, use numbers instead of names.
536 */
537 static void
inetprint(struct sockaddr * sa,const char * proto)538 inetprint(struct sockaddr *sa, const char *proto)
539 {
540 struct servent *sp = 0;
541 char line[80], *cp;
542 int port;
543
544 switch (sa->sa_family) {
545 case AF_INET:
546 port = ((struct sockaddr_in *)sa)->sin_port;
547 break;
548 #ifdef INET6
549 case AF_INET6:
550 port = ((struct sockaddr_in6 *)sa)->sin6_port;
551 break;
552 #endif
553 default:
554 port = 0;
555 break;
556 }
557 snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
558 cp = strchr(line, '\0');
559 if (!nflag && port)
560 sp = getservbyport(port, proto);
561 if (sp || port == 0)
562 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
563 sp ? sp->s_name : "*");
564 else
565 snprintf(cp, sizeof(line) - (cp - line), "%d",
566 ntohs((u_short)port));
567 /* pad to full column to clear any garbage */
568 cp = strchr(line, '\0');
569 while (cp - line < 22)
570 *cp++ = ' ';
571 line[22] = '\0';
572 waddstr(wnd, line);
573 }
574
575 /*
576 * Construct an Internet address representation.
577 * If the nflag has been supplied, give
578 * numeric value, otherwise try for symbolic name.
579 */
580 static char *
inetname(struct sockaddr * sa)581 inetname(struct sockaddr *sa)
582 {
583 char *cp = 0;
584 static char line[NI_MAXHOST];
585 struct hostent *hp;
586 struct in_addr in;
587
588 #ifdef INET6
589 if (sa->sa_family == AF_INET6) {
590 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
591 &in6addr_any, sizeof(in6addr_any)) == 0)
592 strcpy(line, "*");
593 else
594 getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
595 nflag ? NI_NUMERICHOST : 0);
596 return (line);
597 }
598 #endif
599
600 in = ((struct sockaddr_in *)sa)->sin_addr;
601 if (!nflag && in.s_addr != INADDR_ANY) {
602 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
603 if (hp)
604 cp = hp->h_name;
605 }
606 if (in.s_addr == INADDR_ANY)
607 strcpy(line, "*");
608 else if (cp)
609 snprintf(line, sizeof(line), "%s", cp);
610 else {
611 in.s_addr = ntohl(in.s_addr);
612 #define C(x) ((x) & 0xff)
613 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
614 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
615 }
616 return (line);
617 }
618
619 int
cmdnetstat(const char * cmd,const char * args)620 cmdnetstat(const char *cmd, const char *args)
621 {
622 if (prefix(cmd, "all")) {
623 aflag = !aflag;
624 goto fixup;
625 }
626 if (prefix(cmd, "numbers") || prefix(cmd, "names")) {
627 struct netinfo *p;
628 int new;
629
630 new = prefix(cmd, "numbers");
631 if (new == nflag)
632 return (1);
633 TAILQ_FOREACH(p, &netcb, chain) {
634 if (p->ni_line == -1)
635 continue;
636 p->ni_flags |= NIF_LACHG|NIF_FACHG;
637 }
638 nflag = new;
639 goto redisplay;
640 }
641 if (!netcmd(cmd, args))
642 return (0);
643 fixup:
644 fetchnetstat();
645 redisplay:
646 shownetstat();
647 refresh();
648 return (1);
649 }
650