xref: /dragonfly/usr.bin/sockstat/sockstat.c (revision 7bc7e232) 
1 /*-
2  * Copyright (c) 2005 Joerg Sonnenberger <joerg@bec.de>.  All rights reserved.
3  * Copyright (c) 2002 Dag-Erling Co�dan Sm�rgrav
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  * $DragonFly: src/usr.bin/sockstat/sockstat.c,v 1.7 2007/02/01 10:33:26 corecode Exp $
31  */
32 
33 #include <sys/param.h>
34 #include <sys/socket.h>
35 #include <sys/socketvar.h>
36 #include <sys/sysctl.h>
37 #include <sys/file.h>
38 #include <sys/user.h>
39 
40 #include <sys/un.h>
41 #include <sys/unpcb.h>
42 
43 #include <net/route.h>
44 
45 #include <netinet/in.h>
46 #include <netinet/in_pcb.h>
47 #include <netinet/tcp.h>
48 #include <netinet/tcp_seq.h>
49 #include <netinet/tcp_var.h>
50 #include <arpa/inet.h>
51 
52 #include <ctype.h>
53 #include <err.h>
54 #include <errno.h>
55 #include <kinfo.h>
56 #include <netdb.h>
57 #include <pwd.h>
58 #include <stdarg.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <unistd.h>
63 
64 static int	 opt_4;		/* Show IPv4 sockets */
65 static int	 opt_6;		/* Show IPv6 sockets */
66 static int	 opt_c;		/* Show connected sockets */
67 static int	 opt_l;		/* Show listening sockets */
68 static int	 opt_u;		/* Show Unix domain sockets */
69 static int	 opt_v;		/* Verbose mode */
70 
71 static int	*ports;
72 
73 #define INT_BIT (sizeof(int)*CHAR_BIT)
74 #define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
75 #define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
76 
77 struct sock {
78 	void *socket;
79 	void *pcb;
80 	int vflag;
81 	int family;
82 	int proto;
83 	const char *protoname;
84 	struct sockaddr_storage laddr;
85 	struct sockaddr_storage faddr;
86 	struct sock *next;
87 };
88 
89 #define HASHSIZE 1009
90 static struct sock *sockhash[HASHSIZE];
91 
92 static struct kinfo_file *xfiles;
93 static int nxfiles;
94 
95 static int
96 xprintf(const char *fmt, ...)
97 {
98 	va_list ap;
99 	int len;
100 
101 	va_start(ap, fmt);
102 	len = vprintf(fmt, ap);
103 	va_end(ap);
104 	if (len < 0)
105 		err(1, "printf()");
106 	return (len);
107 }
108 
109 static void
110 parse_ports(const char *portspec)
111 {
112 	const char *p, *q;
113 	int port, end;
114 
115 	if (ports == NULL)
116 		if ((ports = calloc(65536 / INT_BIT, sizeof(int))) == NULL)
117 			err(1, "calloc()");
118 	p = portspec;
119 	while (*p != '\0') {
120 		if (!isdigit(*p))
121 			errx(1, "syntax error in port range");
122 		for (q = p; *q != '\0' && isdigit(*q); ++q)
123 			/* nothing */ ;
124 		for (port = 0; p < q; ++p)
125 			port = port * 10 + (*p - '0');
126 		if (port < 0 || port > 65535)
127 			errx(1, "invalid port number");
128 		SET_PORT(port);
129 		switch (*p) {
130 		case '-':
131 			++p;
132 			break;
133 		case ',':
134 			++p;
135 			/* fall through */
136 		case '\0':
137 		default:
138 			continue;
139 		}
140 		for (q = p; *q != '\0' && isdigit(*q); ++q)
141 			/* nothing */ ;
142 		for (end = 0; p < q; ++p)
143 			end = end * 10 + (*p - '0');
144 		if (end < port || end > 65535)
145 			errx(1, "invalid port number");
146 		while (port++ < end)
147 			SET_PORT(port);
148 		if (*p == ',')
149 			++p;
150 	}
151 }
152 
153 static void
154 sockaddr(struct sockaddr_storage *sa, int af, void *addr, int port)
155 {
156 	struct sockaddr_in *sin4;
157 	struct sockaddr_in6 *sin6;
158 
159 	bzero(sa, sizeof *sa);
160 	switch (af) {
161 	case AF_INET:
162 		sin4 = (struct sockaddr_in *)sa;
163 		sin4->sin_len = sizeof *sin4;
164 		sin4->sin_family = af;
165 		sin4->sin_port = port;
166 		sin4->sin_addr = *(struct in_addr *)addr;
167 		break;
168 	case AF_INET6:
169 		sin6 = (struct sockaddr_in6 *)sa;
170 		sin6->sin6_len = sizeof *sin6;
171 		sin6->sin6_family = af;
172 		sin6->sin6_port = port;
173 		sin6->sin6_addr = *(struct in6_addr *)addr;
174 		break;
175 	default:
176 		abort();
177 	}
178 }
179 
180 static void
181 gather_inet(int proto)
182 {
183 	void *so_begin, *so_end;
184 	struct xinpcb *xip;
185 	struct xtcpcb *xtp;
186 	struct inpcb *inp;
187 	struct xsocket *so;
188 	struct sock *sock;
189 	const char *varname, *protoname;
190 	size_t len;
191 	void *buf;
192 	int hash, vflag;
193 
194 	vflag = 0;
195 	if (opt_4)
196 		vflag |= INP_IPV4;
197 	if (opt_6)
198 		vflag |= INP_IPV6;
199 
200 	switch (proto) {
201 	case IPPROTO_TCP:
202 		varname = "net.inet.tcp.pcblist";
203 		protoname = "tcp";
204 		break;
205 	case IPPROTO_UDP:
206 		varname = "net.inet.udp.pcblist";
207 		protoname = "udp";
208 		break;
209 	case IPPROTO_DIVERT:
210 		varname = "net.inet.divert.pcblist";
211 		protoname = "div";
212 		break;
213 	default:
214 		abort();
215 	}
216 
217 	buf = NULL;
218 	len = 0;
219 
220 	if (sysctlbyname(varname, NULL, &len, NULL, 0)) {
221 		if (errno == ENOENT)
222 			goto out;
223 		err(1, "fetching %s", varname);
224 	}
225 	if ((buf = malloc(len)) == NULL)
226 		err(1, "malloc()");
227 	if (sysctlbyname(varname, buf, &len, NULL, 0)) {
228 		if (errno == ENOENT)
229 			goto out;
230 		err(1, "fetching %s", varname);
231 	}
232 
233 	so_begin = buf;
234 	so_end = (uint8_t *)buf + len;
235 
236 	for (so_begin = buf, so_end = (uint8_t *)so_begin + len;
237 	     (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
238 	     (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
239 	     so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
240 		switch (proto) {
241 		case IPPROTO_TCP:
242 			xtp = (struct xtcpcb *)so_begin;
243 			if (xtp->xt_len != sizeof *xtp) {
244 				warnx("struct xtcpcb size mismatch");
245 				goto out;
246 			}
247 			inp = &xtp->xt_inp;
248 			so = &xtp->xt_socket;
249 			break;
250 		case IPPROTO_UDP:
251 		case IPPROTO_DIVERT:
252 			xip = (struct xinpcb *)so_begin;
253 			if (xip->xi_len != sizeof *xip) {
254 				warnx("struct xinpcb size mismatch");
255 				goto out;
256 			}
257 			inp = &xip->xi_inp;
258 			so = &xip->xi_socket;
259 			break;
260 		default:
261 			abort();
262 		}
263 		if ((inp->inp_vflag & vflag) == 0)
264 			continue;
265 		if (inp->inp_vflag & INP_IPV4) {
266 			if ((inp->inp_fport == 0 && !opt_l) ||
267 			    (inp->inp_fport != 0 && !opt_c))
268 				continue;
269 		} else if (inp->inp_vflag & INP_IPV6) {
270 			if ((inp->in6p_fport == 0 && !opt_l) ||
271 			    (inp->in6p_fport != 0 && !opt_c))
272 				continue;
273 		} else {
274 			if (opt_v)
275 				warnx("invalid vflag 0x%x", inp->inp_vflag);
276 			continue;
277 		}
278 		if ((sock = calloc(1, sizeof *sock)) == NULL)
279 			err(1, "malloc()");
280 		sock->socket = so->xso_so;
281 		sock->proto = proto;
282 		if (inp->inp_vflag & INP_IPV4) {
283 			sock->family = AF_INET;
284 			sockaddr(&sock->laddr, sock->family,
285 			    &inp->inp_laddr, inp->inp_lport);
286 			sockaddr(&sock->faddr, sock->family,
287 			    &inp->inp_faddr, inp->inp_fport);
288 		} else if (inp->inp_vflag & INP_IPV6) {
289 			sock->family = AF_INET6;
290 			sockaddr(&sock->laddr, sock->family,
291 			    &inp->in6p_laddr, inp->in6p_lport);
292 			sockaddr(&sock->faddr, sock->family,
293 			    &inp->in6p_faddr, inp->in6p_fport);
294 		}
295 		sock->vflag = inp->inp_vflag;
296 		sock->protoname = protoname;
297 		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
298 		sock->next = sockhash[hash];
299 		sockhash[hash] = sock;
300 	}
301 out:
302 	free(buf);
303 }
304 
305 static void
306 gather_unix(int proto)
307 {
308 	void *so_begin, *so_end;
309 	struct xunpcb *xup;
310 	struct sock *sock;
311 	const char *varname, *protoname;
312 	size_t len;
313 	void *buf;
314 	int hash;
315 
316 	switch (proto) {
317 	case SOCK_STREAM:
318 		varname = "net.local.stream.pcblist";
319 		protoname = "stream";
320 		break;
321 	case SOCK_DGRAM:
322 		varname = "net.local.dgram.pcblist";
323 		protoname = "dgram";
324 		break;
325 	default:
326 		abort();
327 	}
328 
329 	buf = NULL;
330 	len = 0;
331 
332 	if (sysctlbyname(varname, NULL, &len, NULL, 0))
333 		err(1, "fetching %s", varname);
334 
335 	if ((buf = malloc(len)) == NULL)
336 		err(1, "malloc()");
337 	if (sysctlbyname(varname, buf, &len, NULL, 0))
338 		err(1, "fetching %s", varname);
339 
340 	for (so_begin = buf, so_end = (uint8_t *)buf + len;
341 	     (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
342 	     (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
343 	     so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
344 		xup = so_begin;
345 		if (xup->xu_len != sizeof *xup) {
346 			warnx("struct xunpcb size mismatch");
347 			goto out;
348 		}
349 		if ((xup->xu_unp.unp_conn == NULL && !opt_l) ||
350 		    (xup->xu_unp.unp_conn != NULL && !opt_c))
351 			continue;
352 		if ((sock = calloc(1, sizeof *sock)) == NULL)
353 			err(1, "malloc()");
354 		sock->socket = xup->xu_socket.xso_so;
355 		sock->pcb = xup->xu_unpp;
356 		sock->proto = proto;
357 		sock->family = AF_UNIX;
358 		sock->protoname = protoname;
359 		if (xup->xu_unp.unp_addr != NULL)
360 			sock->laddr =
361 			    *(struct sockaddr_storage *)(void *)&xup->xu_addr;
362 		else if (xup->xu_unp.unp_conn != NULL)
363 			*(void **)&sock->faddr = xup->xu_unp.unp_conn;
364 		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
365 		sock->next = sockhash[hash];
366 		sockhash[hash] = sock;
367 	}
368 out:
369 	free(buf);
370 }
371 
372 static void
373 getfiles(void)
374 {
375 	if (kinfo_get_files(&xfiles, &nxfiles))
376 		err(1, "kinfo_get_files");
377 }
378 
379 static int
380 printaddr(int af, struct sockaddr_storage *ss)
381 {
382 	char addrstr[INET6_ADDRSTRLEN] = { '\0', '\0' };
383 	struct sockaddr_un *sun;
384 	void *addr;
385 	int off, port;
386 
387 	switch (af) {
388 	case AF_INET:
389 		addr = &((struct sockaddr_in *)ss)->sin_addr;
390 		if (inet_lnaof(*(struct in_addr *)addr) == INADDR_ANY)
391 			addrstr[0] = '*';
392 		port = ntohs(((struct sockaddr_in *)ss)->sin_port);
393 		break;
394 	case AF_INET6:
395 		addr = &((struct sockaddr_in6 *)ss)->sin6_addr;
396 		if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)addr))
397 			addrstr[0] = '*';
398 		port = ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
399 		break;
400 	case AF_UNIX:
401 		sun = (struct sockaddr_un *)ss;
402 		off = (int)((char *)&sun->sun_path - (char *)sun);
403 		return (xprintf("%.*s", sun->sun_len - off, sun->sun_path));
404 	default:
405 		abort();
406 	}
407 	if (addrstr[0] == '\0')
408 		inet_ntop(af, addr, addrstr, sizeof addrstr);
409 	if (port == 0)
410 		return xprintf("%s:*", addrstr);
411 	else
412 		return xprintf("%s:%d", addrstr, port);
413 }
414 
415 static const char *
416 getprocname(pid_t pid)
417 {
418 	static struct kinfo_proc proc;
419 	size_t len;
420 	int mib[4];
421 
422 	mib[0] = CTL_KERN;
423 	mib[1] = KERN_PROC;
424 	mib[2] = KERN_PROC_PID;
425 	mib[3] = (int)pid;
426 	len = sizeof proc;
427 	if (sysctl(mib, 4, &proc, &len, NULL, 0) == -1) {
428 		warn("sysctl()");
429 		return ("??");
430 	}
431 	return (proc.kp_comm);
432 }
433 
434 static int
435 check_ports(struct sock *s)
436 {
437 	int port;
438 
439 	if (ports == NULL)
440 		return (1);
441 	if ((s->family != AF_INET) && (s->family != AF_INET6))
442 		return (1);
443 	if (s->family == AF_INET)
444 		port = ntohs(((struct sockaddr_in *)(&s->laddr))->sin_port);
445 	else
446 		port = ntohs(((struct sockaddr_in6 *)(&s->laddr))->sin6_port);
447 	if (CHK_PORT(port))
448 		return (1);
449 	if (s->family == AF_INET)
450 		port = ntohs(((struct sockaddr_in *)(&s->faddr))->sin_port);
451 	else
452 		port = ntohs(((struct sockaddr_in6 *)(&s->faddr))->sin6_port);
453 	if (CHK_PORT(port))
454 		return (1);
455 	return (0);
456 }
457 
458 static void
459 display(void)
460 {
461 	struct passwd *pwd;
462 	struct kinfo_file *xf;
463 	struct sock *s;
464 	void *p;
465 	int hash, n, pos;
466 
467 	printf("%-8s %-10s %-5s %-2s %-6s %-21s %-21s\n",
468 	    "USER", "COMMAND", "PID", "FD", "PROTO",
469 	    "LOCAL ADDRESS", "FOREIGN ADDRESS");
470 	setpassent(1);
471 	for (xf = xfiles, n = 0; n < nxfiles; ++n, ++xf) {
472 		if (xf->f_data == NULL)
473 			continue;
474 		hash = (int)((uintptr_t)xf->f_data % HASHSIZE);
475 		for (s = sockhash[hash]; s != NULL; s = s->next)
476 			if ((void *)s->socket == xf->f_data)
477 				break;
478 		if (s == NULL)
479 			continue;
480 		if (!check_ports(s))
481 			continue;
482 		pos = 0;
483 		if ((pwd = getpwuid(xf->f_uid)) == NULL)
484 			pos += xprintf("%lu", (u_long)xf->f_uid);
485 		else
486 			pos += xprintf("%s", pwd->pw_name);
487 		while (pos < 9)
488 			pos += xprintf(" ");
489 		pos += xprintf("%.10s", getprocname(xf->f_pid));
490 		while (pos < 20)
491 			pos += xprintf(" ");
492 		pos += xprintf("%lu", (u_long)xf->f_pid);
493 		while (pos < 26)
494 			pos += xprintf(" ");
495 		pos += xprintf("%d", xf->f_fd);
496 		while (pos < 29)
497 			pos += xprintf(" ");
498 		pos += xprintf("%s", s->protoname);
499 		if (s->vflag & INP_IPV4)
500 			pos += xprintf("4");
501 		if (s->vflag & INP_IPV6)
502 			pos += xprintf("6");
503 		while (pos < 36)
504 			pos += xprintf(" ");
505 		switch (s->family) {
506 		case AF_INET:
507 		case AF_INET6:
508 			pos += printaddr(s->family, &s->laddr);
509 			while (pos < 57)
510 				pos += xprintf(" ");
511 			pos += xprintf(" ");
512 			pos += printaddr(s->family, &s->faddr);
513 			break;
514 		case AF_UNIX:
515 			/* server */
516 			if (s->laddr.ss_len > 0) {
517 				pos += printaddr(s->family, &s->laddr);
518 				break;
519 			}
520 			/* client */
521 			p = *(void **)&s->faddr;
522 			if (p == NULL) {
523 				pos += xprintf("(not connected)");
524 				break;
525 			}
526 			pos += xprintf("-> ");
527 			for (hash = 0; hash < HASHSIZE; ++hash) {
528 				for (s = sockhash[hash]; s != NULL; s = s->next)
529 					if (s->pcb == p)
530 						break;
531 				if (s != NULL)
532 					break;
533 			}
534 			if (s == NULL || s->laddr.ss_len == 0)
535 				pos += xprintf("??");
536 			else
537 				pos += printaddr(s->family, &s->laddr);
538 			break;
539 		default:
540 			abort();
541 		}
542 		xprintf("\n");
543 	}
544 }
545 
546 static void
547 usage(void)
548 {
549 	fprintf(stderr, "Usage: sockstat [-46clu] [-p ports]\n");
550 	exit(1);
551 }
552 
553 int
554 main(int argc, char *argv[])
555 {
556 	int o;
557 
558 	while ((o = getopt(argc, argv, "46clp:uv")) != -1)
559 		switch (o) {
560 		case '4':
561 			opt_4 = 1;
562 			break;
563 		case '6':
564 			opt_6 = 1;
565 			break;
566 		case 'c':
567 			opt_c = 1;
568 			break;
569 		case 'l':
570 			opt_l = 1;
571 			break;
572 		case 'p':
573 			parse_ports(optarg);
574 			break;
575 		case 'u':
576 			opt_u = 1;
577 			break;
578 		case 'v':
579 			++opt_v;
580 			break;
581 		default:
582 			usage();
583 		}
584 
585 	argc -= optind;
586 	argv += optind;
587 
588 	if (argc > 0)
589 		usage();
590 
591 	if (!opt_4 && !opt_6 && !opt_u)
592 		opt_4 = opt_6 = opt_u = 1;
593 	if (!opt_c && !opt_l)
594 		opt_c = opt_l = 1;
595 
596 	if (opt_4 || opt_6) {
597 		gather_inet(IPPROTO_TCP);
598 		gather_inet(IPPROTO_UDP);
599 		gather_inet(IPPROTO_DIVERT);
600 	}
601 	if (opt_u) {
602 		gather_unix(SOCK_STREAM);
603 		gather_unix(SOCK_DGRAM);
604 	}
605 	getfiles();
606 	display();
607 
608 	exit(0);
609 }
610