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
33
34 /*
35 * netstat
36 */
37 #include <sys/param.h>
38 #include <sys/queue.h>
39 #include <sys/socket.h>
40 #include <sys/callout.h>
41 #include <sys/socketvar.h>
42 #include <sys/protosw.h>
43
44 #include <netinet/in.h>
45 #include <arpa/inet.h>
46 #include <net/route.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
49 #ifdef INET6
50 #include <netinet/ip6.h>
51 #endif
52 #include <netinet/in_pcb.h>
53 #include <netinet/ip_icmp.h>
54 #include <netinet/icmp_var.h>
55 #include <netinet/ip_var.h>
56 #include <netinet/tcp.h>
57 #include <netinet/tcpip.h>
58 #include <netinet/tcp_seq.h>
59 #define TCPSTATES
60 #include <netinet/tcp_fsm.h>
61 #include <netinet/tcp_var.h>
62 #include <netinet/udp.h>
63 #include <netinet/udp_var.h>
64
65 #include <netdb.h>
66 #include <nlist.h>
67 #include <paths.h>
68 #include <stdlib.h>
69 #include <string.h>
70
71 #include "systat.h"
72 #include "extern.h"
73
74 static void enter(struct xinpcb *, struct xsocket *so, int, const char *);
75 static char *inetname(struct sockaddr *);
76 static void inetprint(struct sockaddr *, const char *);
77
78 #define streq(a,b) (strcmp(a,b)==0)
79 #define YMAX(w) (getmaxy(w)-2)
80
81 WINDOW *
opennetstat(void)82 opennetstat(void)
83 {
84 sethostent(1);
85 setnetent(1);
86 return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
87 }
88
89 struct netinfo {
90 TAILQ_ENTRY(netinfo) chain;
91 short ni_line; /* line on screen */
92 short ni_seen; /* 0 when not present in list */
93 short ni_flags;
94 #define NIF_LACHG 0x1 /* local address changed */
95 #define NIF_FACHG 0x2 /* foreign address changed */
96 short ni_state; /* tcp state */
97 const char *ni_proto; /* protocol */
98 struct sockaddr_storage ni_lsa; /* local address */
99 struct sockaddr_storage ni_fsa; /* foreign address */
100 u_int ni_rcvcc; /* rcv buffer character count */
101 u_int ni_sndcc; /* snd buffer character count */
102 };
103
104 static TAILQ_HEAD(netinfohead, netinfo) netcb = TAILQ_HEAD_INITIALIZER(netcb);
105
106 static int aflag = 0;
107 static int nflag = 0;
108 static int lastrow = 1;
109
110 void
closenetstat(WINDOW * w)111 closenetstat(WINDOW *w)
112 {
113 struct netinfo *p;
114
115 endhostent();
116 endnetent();
117 TAILQ_FOREACH(p, &netcb, chain) {
118 if (p->ni_line != -1)
119 lastrow--;
120 p->ni_line = -1;
121 }
122 if (w != NULL) {
123 wclear(w);
124 wrefresh(w);
125 delwin(w);
126 }
127 }
128
129 static const char *miblist[] = {
130 "net.inet.tcp.pcblist",
131 "net.inet.udp.pcblist"
132 };
133
134 int
initnetstat(void)135 initnetstat(void)
136 {
137 protos = TCP|UDP;
138 return(1);
139 }
140
141 void
fetchnetstat(void)142 fetchnetstat(void)
143 {
144 struct netinfo *p;
145 int idx;
146 struct xinpgen *inpg;
147 char *cur, *end;
148 struct xinpcb *xip = NULL;
149 struct xtcpcb *xtp = NULL;
150 int plen;
151 size_t lsz;
152
153 TAILQ_FOREACH(p, &netcb, chain)
154 p->ni_seen = 0;
155 if (protos&TCP) {
156 idx = 0;
157 } else if (protos&UDP) {
158 idx = 1;
159 } else {
160 error("No protocols to display");
161 return;
162 }
163
164 for (;idx < 2; idx++) {
165 if (idx == 1 && !(protos&UDP))
166 break;
167 inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
168 if (inpg == NULL) {
169 error("sysctl(%s...) failed", miblist[idx]);
170 continue;
171 }
172 /*
173 * We currently do no require a consistent pcb list.
174 * Try to be robust in case of struct size changes
175 */
176 cur = ((char *)inpg) + inpg->xig_len;
177 /* There is also a trailing struct xinpgen */
178 end = ((char *)inpg) + lsz - inpg->xig_len;
179 if (end <= cur) {
180 free(inpg);
181 continue;
182 }
183 if (idx == 0) { /* TCP */
184 xtp = (struct xtcpcb *)cur;
185 plen = xtp->xt_len;
186 } else {
187 xip = (struct xinpcb *)cur;
188 plen = xip->xi_len;
189 }
190 while (cur + plen <= end) {
191 if (idx == 0) { /* TCP */
192 xtp = (struct xtcpcb *)cur;
193 xip = &xtp->xt_inp;
194 } else {
195 xip = (struct xinpcb *)cur;
196 }
197 cur += plen;
198
199 if (!aflag) {
200 if (xip->inp_vflag & INP_IPV4) {
201 if (xip->inp_laddr.s_addr == INADDR_ANY)
202 continue;
203 }
204 #ifdef INET6
205 else if (xip->inp_vflag & INP_IPV6) {
206 if (memcmp(&xip->in6p_laddr,
207 &in6addr_any, sizeof(in6addr_any))
208 == 0)
209 continue;
210 }
211 #endif
212 }
213 if (nhosts && !checkhost(&xip->inp_inc))
214 continue;
215 if (nports && !checkport(&xip->inp_inc))
216 continue;
217 if (idx == 0)
218 enter(xip, &xip->xi_socket, xtp->t_state,
219 "tcp");
220 else
221 enter(xip, &xip->xi_socket, 0, "udp");
222 }
223 free(inpg);
224 }
225 }
226
227 static void
enter(struct xinpcb * xip,struct xsocket * so,int state,const char * proto)228 enter(struct xinpcb *xip, struct xsocket *so, int state, const char *proto)
229 {
230 struct in_conninfo *inc = &xip->inp_inc;
231 uint8_t vflag = xip->inp_vflag;
232 struct netinfo *p;
233 struct sockaddr_storage lsa, fsa;
234 struct sockaddr_in *sa4;
235 #ifdef INET6
236 struct sockaddr_in6 *sa6;
237 #endif
238
239 memset(&lsa, 0, sizeof(lsa));
240 memset(&fsa, 0, sizeof(fsa));
241 if (vflag & INP_IPV4) {
242 sa4 = (struct sockaddr_in *)&lsa;
243 sa4->sin_addr = inc->inc_laddr;
244 sa4->sin_port = inc->inc_lport;
245 sa4->sin_family = AF_INET;
246 sa4->sin_len = sizeof(struct sockaddr_in);
247
248 sa4 = (struct sockaddr_in *)&fsa;
249 sa4->sin_addr = inc->inc_faddr;
250 sa4->sin_port = inc->inc_fport;
251 sa4->sin_family = AF_INET;
252 sa4->sin_len = sizeof(struct sockaddr_in);
253 }
254 #ifdef INET6
255 else if (vflag & INP_IPV6) {
256 sa6 = (struct sockaddr_in6 *)&lsa;
257 memcpy(&sa6->sin6_addr, &inc->inc6_laddr,
258 sizeof(struct in6_addr));
259 sa6->sin6_port = inc->inc_lport;
260 sa6->sin6_family = AF_INET6;
261 sa6->sin6_len = sizeof(struct sockaddr_in6);
262
263 sa6 = (struct sockaddr_in6 *)&fsa;
264 memcpy(&sa6->sin6_addr, &inc->inc6_faddr,
265 sizeof(struct in6_addr));
266 sa6->sin6_port = inc->inc_fport;
267 sa6->sin6_family = AF_INET6;
268 sa6->sin6_len = sizeof(struct sockaddr_in6);
269 }
270 #endif
271 else
272 return;
273
274 /*
275 * Only take exact matches, any sockets with
276 * previously unbound addresses will be deleted
277 * below in the display routine because they
278 * will appear as ``not seen'' in the kernel
279 * data structures.
280 */
281 TAILQ_FOREACH(p, &netcb, chain) {
282 if (!streq(proto, p->ni_proto))
283 continue;
284 if (p->ni_lsa.ss_family != lsa.ss_family ||
285 memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
286 continue;
287 if (p->ni_fsa.ss_family == fsa.ss_family &&
288 memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
289 break;
290 }
291 if (p == NULL) {
292 if ((p = malloc(sizeof(*p))) == NULL) {
293 error("Out of memory");
294 return;
295 }
296 TAILQ_INSERT_HEAD(&netcb, p, chain);
297 p->ni_line = -1;
298 memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
299 memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
300 p->ni_proto = strdup(proto);
301 p->ni_flags = NIF_LACHG|NIF_FACHG;
302 }
303 p->ni_state = state;
304 p->ni_seen = 1;
305 p->ni_rcvcc = so->so_rcv.sb_cc;
306 p->ni_sndcc = so->so_snd.sb_cc;
307 }
308
309 /* column locations */
310 #define LADDR 0
311 #define FADDR LADDR+23
312 #define PROTO FADDR+23
313 #define RCVCC PROTO+6
314 #define SNDCC RCVCC+7
315 #define STATE SNDCC+7
316
317 void
labelnetstat(void)318 labelnetstat(void)
319 {
320 wmove(wnd, 0, 0); wclrtobot(wnd);
321 mvwaddstr(wnd, 0, LADDR, "Local Address");
322 mvwaddstr(wnd, 0, FADDR, "Foreign Address");
323 mvwaddstr(wnd, 0, PROTO, "Proto");
324 mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
325 mvwaddstr(wnd, 0, SNDCC, "Send-Q");
326 mvwaddstr(wnd, 0, STATE, "(state)");
327 }
328
329 void
shownetstat(void)330 shownetstat(void)
331 {
332 struct netinfo *p, *q;
333 char proto[6];
334 const char *family = "";
335
336 /*
337 * First, delete any connections that have gone
338 * away and adjust the position of connections
339 * below to reflect the deleted line.
340 */
341 p = TAILQ_FIRST(&netcb);
342 while (p != NULL) {
343 if (p->ni_line == -1 || p->ni_seen) {
344 p = TAILQ_NEXT(p, chain);
345 continue;
346 }
347 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
348 TAILQ_FOREACH(q, &netcb, chain)
349 if (q != p && q->ni_line > p->ni_line) {
350 q->ni_line--;
351 /* this shouldn't be necessary */
352 q->ni_flags |= NIF_LACHG|NIF_FACHG;
353 }
354 lastrow--;
355 q = TAILQ_NEXT(p, chain);
356 TAILQ_REMOVE(&netcb, p, chain);
357 free(p);
358 p = q;
359 }
360 /*
361 * Update existing connections and add new ones.
362 */
363 TAILQ_FOREACH(p, &netcb, chain) {
364 if (p->ni_line == -1) {
365 /*
366 * Add a new entry if possible.
367 */
368 if (lastrow > YMAX(wnd))
369 continue;
370 p->ni_line = lastrow++;
371 p->ni_flags |= NIF_LACHG|NIF_FACHG;
372 }
373 if (p->ni_flags & NIF_LACHG) {
374 wmove(wnd, p->ni_line, LADDR);
375 inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
376 p->ni_flags &= ~NIF_LACHG;
377 }
378 if (p->ni_flags & NIF_FACHG) {
379 wmove(wnd, p->ni_line, FADDR);
380 inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
381 p->ni_flags &= ~NIF_FACHG;
382 }
383 #ifdef INET6
384 family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
385 #endif
386 snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
387 mvwaddstr(wnd, p->ni_line, PROTO, proto);
388 mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
389 mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
390 if (streq(p->ni_proto, "tcp")) {
391 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
392 mvwprintw(wnd, p->ni_line, STATE, "%d",
393 p->ni_state);
394 else
395 mvwaddstr(wnd, p->ni_line, STATE,
396 tcpstates[p->ni_state]);
397 }
398 wclrtoeol(wnd);
399 }
400 if (lastrow < YMAX(wnd)) {
401 wmove(wnd, lastrow, 0); wclrtobot(wnd);
402 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */
403 }
404 }
405
406 /*
407 * Pretty print an Internet address (net address + port).
408 * If the nflag was specified, use numbers instead of names.
409 */
410 static void
inetprint(struct sockaddr * sa,const char * proto)411 inetprint(struct sockaddr *sa, const char *proto)
412 {
413 struct servent *sp = 0;
414 char line[80], *cp;
415 int port;
416
417 switch (sa->sa_family) {
418 case AF_INET:
419 port = ((struct sockaddr_in *)sa)->sin_port;
420 break;
421 #ifdef INET6
422 case AF_INET6:
423 port = ((struct sockaddr_in6 *)sa)->sin6_port;
424 break;
425 #endif
426 default:
427 port = 0;
428 break;
429 }
430 snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
431 cp = strchr(line, '\0');
432 if (!nflag && port)
433 sp = getservbyport(port, proto);
434 if (sp || port == 0)
435 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
436 sp ? sp->s_name : "*");
437 else
438 snprintf(cp, sizeof(line) - (cp - line), "%d",
439 ntohs((u_short)port));
440 /* pad to full column to clear any garbage */
441 cp = strchr(line, '\0');
442 while (cp - line < 22)
443 *cp++ = ' ';
444 line[22] = '\0';
445 waddstr(wnd, line);
446 }
447
448 /*
449 * Construct an Internet address representation.
450 * If the nflag has been supplied, give
451 * numeric value, otherwise try for symbolic name.
452 */
453 static char *
inetname(struct sockaddr * sa)454 inetname(struct sockaddr *sa)
455 {
456 char *cp = 0;
457 static char line[NI_MAXHOST];
458 struct hostent *hp;
459 struct in_addr in;
460
461 #ifdef INET6
462 if (sa->sa_family == AF_INET6) {
463 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
464 &in6addr_any, sizeof(in6addr_any)) == 0)
465 strcpy(line, "*");
466 else
467 getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
468 nflag ? NI_NUMERICHOST : 0);
469 return (line);
470 }
471 #endif
472
473 in = ((struct sockaddr_in *)sa)->sin_addr;
474 if (!nflag && in.s_addr != INADDR_ANY) {
475 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
476 if (hp)
477 cp = hp->h_name;
478 }
479 if (in.s_addr == INADDR_ANY)
480 strcpy(line, "*");
481 else if (cp)
482 snprintf(line, sizeof(line), "%s", cp);
483 else {
484 in.s_addr = ntohl(in.s_addr);
485 #define C(x) ((x) & 0xff)
486 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
487 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
488 }
489 return (line);
490 }
491
492 int
cmdnetstat(const char * cmd,const char * args)493 cmdnetstat(const char *cmd, const char *args)
494 {
495 if (prefix(cmd, "all")) {
496 aflag = !aflag;
497 goto fixup;
498 }
499 if (prefix(cmd, "numbers") || prefix(cmd, "names")) {
500 struct netinfo *p;
501 int new;
502
503 new = prefix(cmd, "numbers");
504 if (new == nflag)
505 return (1);
506 TAILQ_FOREACH(p, &netcb, chain) {
507 if (p->ni_line == -1)
508 continue;
509 p->ni_flags |= NIF_LACHG|NIF_FACHG;
510 }
511 nflag = new;
512 goto redisplay;
513 }
514 if (!netcmd(cmd, args))
515 return (0);
516 fixup:
517 fetchnetstat();
518 redisplay:
519 shownetstat();
520 refresh();
521 return (1);
522 }
523