xref: /dragonfly/usr.bin/sockstat/sockstat.c (revision 7485684f) 
1 /*-
2  * Copyright (c) 2005 Joerg Sonnenberger <joerg@bec.de>.  All rights reserved.
3  * Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer
11  *    in this position and unchanged.
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. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  * $FreeBSD: src/usr.bin/sockstat/sockstat.c,v 1.12 2004/12/06 09:28:05 ru Exp $
30  */
31 
32 #include <sys/param.h>
33 #include <sys/socket.h>
34 #include <sys/socketvar.h>
35 #include <sys/sysctl.h>
36 #include <sys/file.h>
37 
38 #include <sys/un.h>
39 #include <sys/unpcb.h>
40 
41 #include <net/route.h>
42 
43 #include <netinet/in.h>
44 #include <netinet/in_pcb.h>
45 #include <netinet/tcp.h>
46 #include <netinet/tcp_seq.h>
47 #include <netinet/tcp_var.h>
48 #include <arpa/inet.h>
49 
50 #include <ctype.h>
51 #include <err.h>
52 #include <errno.h>
53 #include <kinfo.h>
54 #include <netdb.h>
55 #include <pwd.h>
56 #include <stdarg.h>
57 #include <stddef.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62 
63 static int	 opt_4;		/* Show IPv4 sockets */
64 static int	 opt_6;		/* Show IPv6 sockets */
65 static int	 opt_c;		/* Show connected sockets */
66 static int	 opt_l;		/* Show listening sockets */
67 static int	 opt_u;		/* Show Unix domain sockets */
68 static int	 opt_v;		/* Verbose mode */
69 
70 static int	*ports;
71 
72 #define INT_BIT (sizeof(int) * CHAR_BIT)
73 #define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
74 #define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
75 
76 struct sock {
77 	void *socket;
78 	void *pcb;
79 	int family;
80 	int proto;
81 	const char *protoname;
82 	struct sockaddr_storage laddr;
83 	struct sockaddr_storage faddr;
84 	struct sock *next;
85 };
86 
87 #define HASHSIZE 1009
88 static struct sock *sockhash[HASHSIZE];
89 
90 static struct kinfo_file *xfiles;
91 static size_t nxfiles;
92 
93 __printflike(1, 2)
94 static int
95 xprintf(const char *fmt, ...)
96 {
97 	va_list ap;
98 	int len;
99 
100 	va_start(ap, fmt);
101 	len = vprintf(fmt, ap);
102 	va_end(ap);
103 	if (len < 0)
104 		err(1, "printf()");
105 	return (len);
106 }
107 
108 static void
109 parse_ports(const char *portspec)
110 {
111 	const char *p, *q;
112 	int port, end;
113 
114 	if (ports == NULL)
115 		if ((ports = calloc(65536 / INT_BIT, sizeof(int))) == NULL)
116 			err(1, "calloc()");
117 	p = portspec;
118 	while (*p != '\0') {
119 		if (!isdigit(*p))
120 			errx(1, "syntax error in port range");
121 		for (q = p; *q != '\0' && isdigit(*q); ++q)
122 			/* nothing */ ;
123 		for (port = 0; p < q; ++p)
124 			port = port * 10 + (*p - '0');
125 		if (port < 0 || port > 65535)
126 			errx(1, "invalid port number");
127 		SET_PORT(port);
128 		switch (*p) {
129 		case '-':
130 			++p;
131 			break;
132 		case ',':
133 			++p;
134 			/* fall through */
135 		case '\0':
136 		default:
137 			continue;
138 		}
139 		for (q = p; *q != '\0' && isdigit(*q); ++q)
140 			/* nothing */ ;
141 		for (end = 0; p < q; ++p)
142 			end = end * 10 + (*p - '0');
143 		if (end < port || end > 65535)
144 			errx(1, "invalid port number");
145 		while (port++ < end)
146 			SET_PORT(port);
147 		if (*p == ',')
148 			++p;
149 	}
150 }
151 
152 static void
153 sockaddr(struct sockaddr_storage *sa, int af, void *addr, int port)
154 {
155 	struct sockaddr_in *sin4;
156 	struct sockaddr_in6 *sin6;
157 
158 	bzero(sa, sizeof *sa);
159 	switch (af) {
160 	case AF_INET:
161 		sin4 = (struct sockaddr_in *)sa;
162 		sin4->sin_len = sizeof *sin4;
163 		sin4->sin_family = af;
164 		sin4->sin_port = port;
165 		sin4->sin_addr = *(struct in_addr *)addr;
166 		break;
167 	case AF_INET6:
168 		sin6 = (struct sockaddr_in6 *)sa;
169 		sin6->sin6_len = sizeof *sin6;
170 		sin6->sin6_family = af;
171 		sin6->sin6_port = port;
172 		sin6->sin6_addr = *(struct in6_addr *)addr;
173 		break;
174 	default:
175 		abort();
176 	}
177 }
178 
179 static void
180 gather_inet(int proto)
181 {
182 	uint8_t *buf, *so_begin, *so_end;
183 	struct xinpcb *xip;
184 	struct xtcpcb *xtp;
185 	struct inpcb *inp;
186 	struct xsocket *so;
187 	struct sock *sock;
188 	const char *varname, *protoname;
189 	size_t len;
190 	int hash;
191 
192 	switch (proto) {
193 	case IPPROTO_TCP:
194 		varname = "net.inet.tcp.pcblist";
195 		protoname = "tcp";
196 		break;
197 	case IPPROTO_UDP:
198 		varname = "net.inet.udp.pcblist";
199 		protoname = "udp";
200 		break;
201 	case IPPROTO_DIVERT:
202 		varname = "net.inet.divert.pcblist";
203 		protoname = "div";
204 		break;
205 	default:
206 		abort();
207 	}
208 
209 	buf = NULL;
210 	len = 0;
211 
212 	if (sysctlbyname(varname, NULL, &len, NULL, 0)) {
213 		if (errno == ENOENT)
214 			goto out;
215 		err(1, "fetching %s", varname);
216 	}
217 	if ((buf = malloc(len)) == NULL)
218 		err(1, "malloc()");
219 	if (sysctlbyname(varname, buf, &len, NULL, 0)) {
220 		if (errno == ENOENT)
221 			goto out;
222 		err(1, "fetching %s", varname);
223 	}
224 
225 	for (so_begin = buf, so_end = buf + len;
226 	     so_begin + sizeof(size_t) < so_end &&
227 	     so_begin + *(size_t *)so_begin <= so_end;
228 	     so_begin = so_begin + *(size_t *)so_begin) {
229 		switch (proto) {
230 		case IPPROTO_TCP:
231 			xtp = (struct xtcpcb *)so_begin;
232 			if (xtp->xt_len != sizeof *xtp) {
233 				warnx("struct xtcpcb size mismatch");
234 				goto out;
235 			}
236 			inp = &xtp->xt_inp;
237 			so = &xtp->xt_socket;
238 			break;
239 		case IPPROTO_UDP:
240 		case IPPROTO_DIVERT:
241 			xip = (struct xinpcb *)so_begin;
242 			if (xip->xi_len != sizeof *xip) {
243 				warnx("struct xinpcb size mismatch");
244 				goto out;
245 			}
246 			inp = &xip->xi_inp;
247 			so = &xip->xi_socket;
248 			break;
249 		default:
250 			abort();
251 		}
252 		if ((INP_ISIPV4(inp) && !opt_4) || (INP_ISIPV6(inp) && !opt_6))
253 			continue;
254 		if (INP_ISIPV4(inp)) {
255 			if ((inp->inp_fport == 0 && !opt_l) ||
256 			    (inp->inp_fport != 0 && !opt_c))
257 				continue;
258 		} else if (INP_ISIPV6(inp)) {
259 			if ((inp->in6p_fport == 0 && !opt_l) ||
260 			    (inp->in6p_fport != 0 && !opt_c))
261 				continue;
262 		} else {
263 			if (opt_v)
264 				warnx("invalid af 0x%x", inp->inp_af);
265 			continue;
266 		}
267 		if ((sock = calloc(1, sizeof *sock)) == NULL)
268 			err(1, "malloc()");
269 		sock->socket = so->xso_so;
270 		sock->proto = proto;
271 		if (INP_ISIPV4(inp)) {
272 			sock->family = AF_INET;
273 			sockaddr(&sock->laddr, sock->family,
274 			    &inp->inp_laddr, inp->inp_lport);
275 			sockaddr(&sock->faddr, sock->family,
276 			    &inp->inp_faddr, inp->inp_fport);
277 		} else if (INP_ISIPV6(inp)) {
278 			sock->family = AF_INET6;
279 			sockaddr(&sock->laddr, sock->family,
280 			    &inp->in6p_laddr, inp->in6p_lport);
281 			sockaddr(&sock->faddr, sock->family,
282 			    &inp->in6p_faddr, inp->in6p_fport);
283 		}
284 		sock->protoname = protoname;
285 		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
286 		sock->next = sockhash[hash];
287 		sockhash[hash] = sock;
288 	}
289 out:
290 	free(buf);
291 }
292 
293 static void
294 gather_unix(int proto)
295 {
296 	uint8_t *buf, *so_begin, *so_end;
297 	struct xunpcb *xup;
298 	struct sock *sock;
299 	const char *varname, *protoname;
300 	size_t len;
301 	int hash;
302 
303 	switch (proto) {
304 	case SOCK_STREAM:
305 		varname = "net.local.stream.pcblist";
306 		protoname = "stream";
307 		break;
308 	case SOCK_DGRAM:
309 		varname = "net.local.dgram.pcblist";
310 		protoname = "dgram";
311 		break;
312 	default:
313 		abort();
314 	}
315 
316 	buf = NULL;
317 	len = 0;
318 
319 	if (sysctlbyname(varname, NULL, &len, NULL, 0))
320 		err(1, "fetching %s", varname);
321 
322 	if ((buf = malloc(len)) == NULL)
323 		err(1, "malloc()");
324 	if (sysctlbyname(varname, buf, &len, NULL, 0))
325 		err(1, "fetching %s", varname);
326 
327 	for (so_begin = buf, so_end = buf + len;
328 	     so_begin + sizeof(size_t) < so_end &&
329 	     so_begin + *(size_t *)so_begin <= so_end;
330 	     so_begin = so_begin + *(size_t *)so_begin) {
331 		xup = (struct xunpcb *)so_begin;
332 		if (xup->xu_len != sizeof *xup) {
333 			warnx("struct xunpcb size mismatch");
334 			goto out;
335 		}
336 		if ((xup->xu_unp.unp_conn == NULL && !opt_l) ||
337 		    (xup->xu_unp.unp_conn != NULL && !opt_c))
338 			continue;
339 		if ((sock = calloc(1, sizeof *sock)) == NULL)
340 			err(1, "malloc()");
341 		sock->socket = xup->xu_socket.xso_so;
342 		sock->pcb = xup->xu_unpp;
343 		sock->proto = proto;
344 		sock->family = AF_UNIX;
345 		sock->protoname = protoname;
346 		if (xup->xu_unp.unp_addr != NULL)
347 			sock->laddr = *(struct sockaddr_storage *)&xup->xu_addr;
348 		else if (xup->xu_unp.unp_conn != NULL)
349 			*(void **)&sock->faddr = xup->xu_unp.unp_conn;
350 		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
351 		sock->next = sockhash[hash];
352 		sockhash[hash] = sock;
353 	}
354 out:
355 	free(buf);
356 }
357 
358 static void
359 getfiles(void)
360 {
361 	if (kinfo_get_files(&xfiles, &nxfiles))
362 		err(1, "kinfo_get_files");
363 }
364 
365 static void
366 printproto(int width, int af, const char *protoname)
367 {
368 	int n;
369 
370 	switch (af) {
371 	case AF_INET:
372 	case AF_INET6:
373 		n = xprintf("%s%c", protoname, af == AF_INET ? '4' : '6');
374 		break;
375 	default:
376 		n = xprintf("%s", protoname);
377 		break;
378 	}
379 
380 	if (width > 0 && width > n)
381 		xprintf("%*s", width - n, "");
382 }
383 
384 static void
385 printaddr(int width, int af, struct sockaddr_storage *ss)
386 {
387 	char addrstr[INET6_ADDRSTRLEN] = { '\0', '\0' };
388 	struct sockaddr_un *sun;
389 	void *addr;
390 	int port, n;
391 
392 	if (af == AF_UNIX) {
393 		sun = (struct sockaddr_un *)ss;
394 		n = sun->sun_len - offsetof(struct sockaddr_un, sun_path);
395 		xprintf("%.*s", n, sun->sun_path);
396 		if (width > 0 && width > n)
397 			xprintf("%*s", width - n, "");
398 		return;
399 	}
400 
401 	switch (af) {
402 	case AF_INET:
403 		addr = &((struct sockaddr_in *)ss)->sin_addr;
404 		if (inet_lnaof(*(struct in_addr *)addr) == INADDR_ANY)
405 			addrstr[0] = '*';
406 		port = ntohs(((struct sockaddr_in *)ss)->sin_port);
407 		break;
408 	case AF_INET6:
409 		addr = &((struct sockaddr_in6 *)ss)->sin6_addr;
410 		if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)addr))
411 			addrstr[0] = '*';
412 		port = ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
413 		break;
414 	default:
415 		abort();
416 	}
417 
418 	if (addrstr[0] == '\0')
419 		inet_ntop(af, addr, addrstr, sizeof addrstr);
420 	if (port == 0)
421 		n = xprintf("%s:*", addrstr);
422 	else
423 		n = xprintf("%s:%d", addrstr, port);
424 	if (width > 0 && width > n)
425 		xprintf("%*s", width - n, "");
426 }
427 
428 static const char *
429 getprocname(pid_t pid)
430 {
431 	static struct kinfo_proc proc;
432 	size_t len;
433 	int mib[4];
434 
435 	mib[0] = CTL_KERN;
436 	mib[1] = KERN_PROC;
437 	mib[2] = KERN_PROC_PID;
438 	mib[3] = (int)pid;
439 	len = sizeof proc;
440 	if (sysctl(mib, 4, &proc, &len, NULL, 0) == -1) {
441 		warn("sysctl()");
442 		return ("??");
443 	}
444 	return (proc.kp_comm);
445 }
446 
447 static int
448 check_ports(struct sock *s)
449 {
450 	int port;
451 
452 	if (ports == NULL)
453 		return (1);
454 	if ((s->family != AF_INET) && (s->family != AF_INET6))
455 		return (1);
456 	if (s->family == AF_INET)
457 		port = ntohs(((struct sockaddr_in *)(&s->laddr))->sin_port);
458 	else
459 		port = ntohs(((struct sockaddr_in6 *)(&s->laddr))->sin6_port);
460 	if (CHK_PORT(port))
461 		return (1);
462 	if (s->family == AF_INET)
463 		port = ntohs(((struct sockaddr_in *)(&s->faddr))->sin_port);
464 	else
465 		port = ntohs(((struct sockaddr_in6 *)(&s->faddr))->sin6_port);
466 	if (CHK_PORT(port))
467 		return (1);
468 	return (0);
469 }
470 
471 static void
472 display(void)
473 {
474 	struct passwd *pwd;
475 	struct kinfo_file *xf;
476 	struct sock *s;
477 	void *p;
478 	int hash, n;
479 
480 	printf("%-8s %-10s %6s %5s %-6s %-21s %-21s\n",
481 	    "USER", "COMMAND", "PID", "FD", "PROTO",
482 	    "LOCAL ADDRESS", "FOREIGN ADDRESS");
483 	setpassent(1);
484 	for (xf = xfiles, n = 0; n < (int)nxfiles; ++n, ++xf) {
485 		if (xf->f_data == NULL)
486 			continue;
487 		hash = (int)((uintptr_t)xf->f_data % HASHSIZE);
488 		for (s = sockhash[hash]; s != NULL; s = s->next)
489 			if ((void *)s->socket == xf->f_data)
490 				break;
491 		if (s == NULL)
492 			continue;
493 		if (!check_ports(s))
494 			continue;
495 		if ((pwd = getpwuid(xf->f_uid)) != NULL)
496 			xprintf("%-8.8s ", pwd->pw_name);
497 		else
498 			xprintf("%-8lu ", (u_long)xf->f_uid);
499 		xprintf("%-10.10s ", getprocname(xf->f_pid));
500 		xprintf("%6lu ", (u_long)xf->f_pid);
501 		xprintf("%5d ", xf->f_fd);
502 		printproto(6, s->family, s->protoname);
503 		xprintf(" ");
504 		switch (s->family) {
505 		case AF_INET:
506 		case AF_INET6:
507 			printaddr(21, s->family, &s->laddr);
508 			xprintf(" ");
509 			printaddr(0, s->family, &s->faddr);
510 			break;
511 		case AF_UNIX:
512 			/* server */
513 			if (s->laddr.ss_len > 0) {
514 				printaddr(0, s->family, &s->laddr);
515 				break;
516 			}
517 			/* client */
518 			p = *(void **)&s->faddr;
519 			if (p == NULL) {
520 				xprintf("(not connected)");
521 				break;
522 			}
523 			xprintf("-> ");
524 			for (hash = 0; hash < HASHSIZE; ++hash) {
525 				for (s = sockhash[hash]; s != NULL; s = s->next)
526 					if (s->pcb == p)
527 						break;
528 				if (s != NULL)
529 					break;
530 			}
531 			if (s == NULL || s->laddr.ss_len == 0)
532 				xprintf("??");
533 			else
534 				printaddr(0, s->family, &s->laddr);
535 			break;
536 		default:
537 			abort();
538 		}
539 		xprintf("\n");
540 	}
541 }
542 
543 static void
544 usage(void)
545 {
546 	fprintf(stderr, "Usage: sockstat [-46clu] [-p ports]\n");
547 	exit(1);
548 }
549 
550 int
551 main(int argc, char *argv[])
552 {
553 	int o;
554 
555 	while ((o = getopt(argc, argv, "46clp:uv")) != -1)
556 		switch (o) {
557 		case '4':
558 			opt_4 = 1;
559 			break;
560 		case '6':
561 			opt_6 = 1;
562 			break;
563 		case 'c':
564 			opt_c = 1;
565 			break;
566 		case 'l':
567 			opt_l = 1;
568 			break;
569 		case 'p':
570 			parse_ports(optarg);
571 			break;
572 		case 'u':
573 			opt_u = 1;
574 			break;
575 		case 'v':
576 			++opt_v;
577 			break;
578 		default:
579 			usage();
580 		}
581 
582 	argc -= optind;
583 	argv += optind;
584 
585 	if (argc > 0)
586 		usage();
587 
588 	if (!opt_4 && !opt_6 && !opt_u)
589 		opt_4 = opt_6 = opt_u = 1;
590 	if (!opt_c && !opt_l)
591 		opt_c = opt_l = 1;
592 
593 	if (opt_4 || opt_6) {
594 		gather_inet(IPPROTO_TCP);
595 		gather_inet(IPPROTO_UDP);
596 		gather_inet(IPPROTO_DIVERT);
597 	}
598 	if (opt_u) {
599 		gather_unix(SOCK_STREAM);
600 		gather_unix(SOCK_DGRAM);
601 	}
602 	getfiles();
603 	display();
604 
605 	exit(0);
606 }
607