xref: /dragonfly/usr.bin/sockstat/sockstat.c (revision 92db1a35) 
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 <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <unistd.h>
61 
62 static int	 opt_4;		/* Show IPv4 sockets */
63 static int	 opt_6;		/* Show IPv6 sockets */
64 static int	 opt_c;		/* Show connected sockets */
65 static int	 opt_l;		/* Show listening sockets */
66 static int	 opt_u;		/* Show Unix domain sockets */
67 static int	 opt_v;		/* Verbose mode */
68 
69 static int	*ports;
70 
71 #define INT_BIT (sizeof(int)*CHAR_BIT)
72 #define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
73 #define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
74 
75 struct sock {
76 	void *socket;
77 	void *pcb;
78 	int family;
79 	int proto;
80 	const char *protoname;
81 	struct sockaddr_storage laddr;
82 	struct sockaddr_storage faddr;
83 	struct sock *next;
84 };
85 
86 static int xprintf(const char *, ...) __printflike(1, 2);
87 
88 #define HASHSIZE 1009
89 static struct sock *sockhash[HASHSIZE];
90 
91 static struct kinfo_file *xfiles;
92 static size_t nxfiles;
93 
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 	void *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 	void *buf;
191 	int hash;
192 
193 	switch (proto) {
194 	case IPPROTO_TCP:
195 		varname = "net.inet.tcp.pcblist";
196 		protoname = "tcp";
197 		break;
198 	case IPPROTO_UDP:
199 		varname = "net.inet.udp.pcblist";
200 		protoname = "udp";
201 		break;
202 	case IPPROTO_DIVERT:
203 		varname = "net.inet.divert.pcblist";
204 		protoname = "div";
205 		break;
206 	default:
207 		abort();
208 	}
209 
210 	buf = NULL;
211 	len = 0;
212 
213 	if (sysctlbyname(varname, NULL, &len, NULL, 0)) {
214 		if (errno == ENOENT)
215 			goto out;
216 		err(1, "fetching %s", varname);
217 	}
218 	if ((buf = malloc(len)) == NULL)
219 		err(1, "malloc()");
220 	if (sysctlbyname(varname, buf, &len, NULL, 0)) {
221 		if (errno == ENOENT)
222 			goto out;
223 		err(1, "fetching %s", varname);
224 	}
225 
226 	so_begin = buf;
227 	so_end = (uint8_t *)buf + len;
228 
229 	for (so_begin = buf, so_end = (uint8_t *)so_begin + len;
230 	     (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
231 	     (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
232 	     so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
233 		switch (proto) {
234 		case IPPROTO_TCP:
235 			xtp = (struct xtcpcb *)so_begin;
236 			if (xtp->xt_len != sizeof *xtp) {
237 				warnx("struct xtcpcb size mismatch");
238 				goto out;
239 			}
240 			inp = &xtp->xt_inp;
241 			so = &xtp->xt_socket;
242 			break;
243 		case IPPROTO_UDP:
244 		case IPPROTO_DIVERT:
245 			xip = (struct xinpcb *)so_begin;
246 			if (xip->xi_len != sizeof *xip) {
247 				warnx("struct xinpcb size mismatch");
248 				goto out;
249 			}
250 			inp = &xip->xi_inp;
251 			so = &xip->xi_socket;
252 			break;
253 		default:
254 			abort();
255 		}
256 		if ((INP_ISIPV4(inp) && !opt_4) || (INP_ISIPV6(inp) && !opt_6))
257 			continue;
258 		if (INP_ISIPV4(inp)) {
259 			if ((inp->inp_fport == 0 && !opt_l) ||
260 			    (inp->inp_fport != 0 && !opt_c))
261 				continue;
262 		} else if (INP_ISIPV6(inp)) {
263 			if ((inp->in6p_fport == 0 && !opt_l) ||
264 			    (inp->in6p_fport != 0 && !opt_c))
265 				continue;
266 		} else {
267 			if (opt_v)
268 				warnx("invalid af 0x%x", inp->inp_af);
269 			continue;
270 		}
271 		if ((sock = calloc(1, sizeof *sock)) == NULL)
272 			err(1, "malloc()");
273 		sock->socket = so->xso_so;
274 		sock->proto = proto;
275 		if (INP_ISIPV4(inp)) {
276 			sock->family = AF_INET;
277 			sockaddr(&sock->laddr, sock->family,
278 			    &inp->inp_laddr, inp->inp_lport);
279 			sockaddr(&sock->faddr, sock->family,
280 			    &inp->inp_faddr, inp->inp_fport);
281 		} else if (INP_ISIPV6(inp)) {
282 			sock->family = AF_INET6;
283 			sockaddr(&sock->laddr, sock->family,
284 			    &inp->in6p_laddr, inp->in6p_lport);
285 			sockaddr(&sock->faddr, sock->family,
286 			    &inp->in6p_faddr, inp->in6p_fport);
287 		}
288 		sock->protoname = protoname;
289 		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
290 		sock->next = sockhash[hash];
291 		sockhash[hash] = sock;
292 	}
293 out:
294 	free(buf);
295 }
296 
297 static void
298 gather_unix(int proto)
299 {
300 	void *so_begin, *so_end;
301 	struct xunpcb *xup;
302 	struct sock *sock;
303 	const char *varname, *protoname;
304 	size_t len;
305 	void *buf;
306 	int hash;
307 
308 	switch (proto) {
309 	case SOCK_STREAM:
310 		varname = "net.local.stream.pcblist";
311 		protoname = "stream";
312 		break;
313 	case SOCK_DGRAM:
314 		varname = "net.local.dgram.pcblist";
315 		protoname = "dgram";
316 		break;
317 	default:
318 		abort();
319 	}
320 
321 	buf = NULL;
322 	len = 0;
323 
324 	if (sysctlbyname(varname, NULL, &len, NULL, 0))
325 		err(1, "fetching %s", varname);
326 
327 	if ((buf = malloc(len)) == NULL)
328 		err(1, "malloc()");
329 	if (sysctlbyname(varname, buf, &len, NULL, 0))
330 		err(1, "fetching %s", varname);
331 
332 	for (so_begin = buf, so_end = (uint8_t *)buf + len;
333 	     (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
334 	     (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
335 	     so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
336 		xup = so_begin;
337 		if (xup->xu_len != sizeof *xup) {
338 			warnx("struct xunpcb size mismatch");
339 			goto out;
340 		}
341 		if ((xup->xu_unp.unp_conn == NULL && !opt_l) ||
342 		    (xup->xu_unp.unp_conn != NULL && !opt_c))
343 			continue;
344 		if ((sock = calloc(1, sizeof *sock)) == NULL)
345 			err(1, "malloc()");
346 		sock->socket = xup->xu_socket.xso_so;
347 		sock->pcb = xup->xu_unpp;
348 		sock->proto = proto;
349 		sock->family = AF_UNIX;
350 		sock->protoname = protoname;
351 		if (xup->xu_unp.unp_addr != NULL)
352 			sock->laddr =
353 			    *(struct sockaddr_storage *)(void *)&xup->xu_addr;
354 		else if (xup->xu_unp.unp_conn != NULL)
355 			*(void **)&sock->faddr = xup->xu_unp.unp_conn;
356 		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
357 		sock->next = sockhash[hash];
358 		sockhash[hash] = sock;
359 	}
360 out:
361 	free(buf);
362 }
363 
364 static void
365 getfiles(void)
366 {
367 	if (kinfo_get_files(&xfiles, &nxfiles))
368 		err(1, "kinfo_get_files");
369 }
370 
371 static int
372 printaddr(int af, struct sockaddr_storage *ss)
373 {
374 	char addrstr[INET6_ADDRSTRLEN] = { '\0', '\0' };
375 	struct sockaddr_un *sun;
376 	void *addr;
377 	int off, port;
378 
379 	switch (af) {
380 	case AF_INET:
381 		addr = &((struct sockaddr_in *)ss)->sin_addr;
382 		if (inet_lnaof(*(struct in_addr *)addr) == INADDR_ANY)
383 			addrstr[0] = '*';
384 		port = ntohs(((struct sockaddr_in *)ss)->sin_port);
385 		break;
386 	case AF_INET6:
387 		addr = &((struct sockaddr_in6 *)ss)->sin6_addr;
388 		if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)addr))
389 			addrstr[0] = '*';
390 		port = ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
391 		break;
392 	case AF_UNIX:
393 		sun = (struct sockaddr_un *)ss;
394 		off = (int)((char *)&sun->sun_path - (char *)sun);
395 		return (xprintf("%.*s", sun->sun_len - off, sun->sun_path));
396 	default:
397 		abort();
398 	}
399 	if (addrstr[0] == '\0')
400 		inet_ntop(af, addr, addrstr, sizeof addrstr);
401 	if (port == 0)
402 		return xprintf("%s:*", addrstr);
403 	else
404 		return xprintf("%s:%d", addrstr, port);
405 }
406 
407 static const char *
408 getprocname(pid_t pid)
409 {
410 	static struct kinfo_proc proc;
411 	size_t len;
412 	int mib[4];
413 
414 	mib[0] = CTL_KERN;
415 	mib[1] = KERN_PROC;
416 	mib[2] = KERN_PROC_PID;
417 	mib[3] = (int)pid;
418 	len = sizeof proc;
419 	if (sysctl(mib, 4, &proc, &len, NULL, 0) == -1) {
420 		warn("sysctl()");
421 		return ("??");
422 	}
423 	return (proc.kp_comm);
424 }
425 
426 static int
427 check_ports(struct sock *s)
428 {
429 	int port;
430 
431 	if (ports == NULL)
432 		return (1);
433 	if ((s->family != AF_INET) && (s->family != AF_INET6))
434 		return (1);
435 	if (s->family == AF_INET)
436 		port = ntohs(((struct sockaddr_in *)(&s->laddr))->sin_port);
437 	else
438 		port = ntohs(((struct sockaddr_in6 *)(&s->laddr))->sin6_port);
439 	if (CHK_PORT(port))
440 		return (1);
441 	if (s->family == AF_INET)
442 		port = ntohs(((struct sockaddr_in *)(&s->faddr))->sin_port);
443 	else
444 		port = ntohs(((struct sockaddr_in6 *)(&s->faddr))->sin6_port);
445 	if (CHK_PORT(port))
446 		return (1);
447 	return (0);
448 }
449 
450 static void
451 display(void)
452 {
453 	struct passwd *pwd;
454 	struct kinfo_file *xf;
455 	struct sock *s;
456 	void *p;
457 	int hash, n, pos;
458 
459 	printf("%-8s %-10s %-5s %-2s %-6s %-21s %-21s\n",
460 	    "USER", "COMMAND", "PID", "FD", "PROTO",
461 	    "LOCAL ADDRESS", "FOREIGN ADDRESS");
462 	setpassent(1);
463 	for (xf = xfiles, n = 0; n < (int)nxfiles; ++n, ++xf) {
464 		if (xf->f_data == NULL)
465 			continue;
466 		hash = (int)((uintptr_t)xf->f_data % HASHSIZE);
467 		for (s = sockhash[hash]; s != NULL; s = s->next)
468 			if ((void *)s->socket == xf->f_data)
469 				break;
470 		if (s == NULL)
471 			continue;
472 		if (!check_ports(s))
473 			continue;
474 		pos = 0;
475 		if ((pwd = getpwuid(xf->f_uid)) == NULL)
476 			pos += xprintf("%lu", (u_long)xf->f_uid);
477 		else
478 			pos += xprintf("%s", pwd->pw_name);
479 		while (pos < 9)
480 			pos += xprintf(" ");
481 		pos += xprintf("%.10s", getprocname(xf->f_pid));
482 		while (pos < 20)
483 			pos += xprintf(" ");
484 		pos += xprintf("%lu", (u_long)xf->f_pid);
485 		while (pos < 26)
486 			pos += xprintf(" ");
487 		pos += xprintf("%d", xf->f_fd);
488 		while (pos < 29)
489 			pos += xprintf(" ");
490 		pos += xprintf("%s", s->protoname);
491 		if (s->family == AF_INET)
492 			pos += xprintf("4");
493 		if (s->family == AF_INET6)
494 			pos += xprintf("6");
495 		while (pos < 36)
496 			pos += xprintf(" ");
497 		switch (s->family) {
498 		case AF_INET:
499 		case AF_INET6:
500 			pos += printaddr(s->family, &s->laddr);
501 			while (pos < 57)
502 				pos += xprintf(" ");
503 			pos += xprintf(" ");
504 			pos += printaddr(s->family, &s->faddr);
505 			break;
506 		case AF_UNIX:
507 			/* server */
508 			if (s->laddr.ss_len > 0) {
509 				pos += printaddr(s->family, &s->laddr);
510 				break;
511 			}
512 			/* client */
513 			p = *(void **)&s->faddr;
514 			if (p == NULL) {
515 				pos += xprintf("(not connected)");
516 				break;
517 			}
518 			pos += xprintf("-> ");
519 			for (hash = 0; hash < HASHSIZE; ++hash) {
520 				for (s = sockhash[hash]; s != NULL; s = s->next)
521 					if (s->pcb == p)
522 						break;
523 				if (s != NULL)
524 					break;
525 			}
526 			if (s == NULL || s->laddr.ss_len == 0)
527 				pos += xprintf("??");
528 			else
529 				pos += printaddr(s->family, &s->laddr);
530 			break;
531 		default:
532 			abort();
533 		}
534 		xprintf("\n");
535 	}
536 }
537 
538 static void
539 usage(void)
540 {
541 	fprintf(stderr, "Usage: sockstat [-46clu] [-p ports]\n");
542 	exit(1);
543 }
544 
545 int
546 main(int argc, char *argv[])
547 {
548 	int o;
549 
550 	while ((o = getopt(argc, argv, "46clp:uv")) != -1)
551 		switch (o) {
552 		case '4':
553 			opt_4 = 1;
554 			break;
555 		case '6':
556 			opt_6 = 1;
557 			break;
558 		case 'c':
559 			opt_c = 1;
560 			break;
561 		case 'l':
562 			opt_l = 1;
563 			break;
564 		case 'p':
565 			parse_ports(optarg);
566 			break;
567 		case 'u':
568 			opt_u = 1;
569 			break;
570 		case 'v':
571 			++opt_v;
572 			break;
573 		default:
574 			usage();
575 		}
576 
577 	argc -= optind;
578 	argv += optind;
579 
580 	if (argc > 0)
581 		usage();
582 
583 	if (!opt_4 && !opt_6 && !opt_u)
584 		opt_4 = opt_6 = opt_u = 1;
585 	if (!opt_c && !opt_l)
586 		opt_c = opt_l = 1;
587 
588 	if (opt_4 || opt_6) {
589 		gather_inet(IPPROTO_TCP);
590 		gather_inet(IPPROTO_UDP);
591 		gather_inet(IPPROTO_DIVERT);
592 	}
593 	if (opt_u) {
594 		gather_unix(SOCK_STREAM);
595 		gather_unix(SOCK_DGRAM);
596 	}
597 	getfiles();
598 	display();
599 
600 	exit(0);
601 }
602