source: MondoRescue/branches/2.2.5/mindi-busybox/networking/netstat.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 14.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini netstat implementation(s) for busybox
4 * based in part on the netstat implementation from net-tools.
5 *
6 * Copyright (C) 2002 by Bart Visscher <magick@linux-fan.com>
7 *
8 * 2002-04-20
9 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
10 *
11 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 */
13
14#include "libbb.h"
15#include "inet_common.h"
16
17enum {
18 OPT_extended = 0x4,
19 OPT_showroute = 0x100,
20 OPT_widedisplay = 0x200 * ENABLE_FEATURE_NETSTAT_WIDE,
21};
22# define NETSTAT_OPTS "laentuwxr"USE_FEATURE_NETSTAT_WIDE("W")
23
24#define NETSTAT_CONNECTED 0x01
25#define NETSTAT_LISTENING 0x02
26#define NETSTAT_NUMERIC 0x04
27/* Must match getopt32 option string */
28#define NETSTAT_TCP 0x10
29#define NETSTAT_UDP 0x20
30#define NETSTAT_RAW 0x40
31#define NETSTAT_UNIX 0x80
32#define NETSTAT_ALLPROTO (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX)
33
34static smallint flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO;
35
36enum {
37 TCP_ESTABLISHED = 1,
38 TCP_SYN_SENT,
39 TCP_SYN_RECV,
40 TCP_FIN_WAIT1,
41 TCP_FIN_WAIT2,
42 TCP_TIME_WAIT,
43 TCP_CLOSE,
44 TCP_CLOSE_WAIT,
45 TCP_LAST_ACK,
46 TCP_LISTEN,
47 TCP_CLOSING /* now a valid state */
48};
49
50static const char *const tcp_state[] = {
51 "",
52 "ESTABLISHED",
53 "SYN_SENT",
54 "SYN_RECV",
55 "FIN_WAIT1",
56 "FIN_WAIT2",
57 "TIME_WAIT",
58 "CLOSE",
59 "CLOSE_WAIT",
60 "LAST_ACK",
61 "LISTEN",
62 "CLOSING"
63};
64
65typedef enum {
66 SS_FREE = 0, /* not allocated */
67 SS_UNCONNECTED, /* unconnected to any socket */
68 SS_CONNECTING, /* in process of connecting */
69 SS_CONNECTED, /* connected to socket */
70 SS_DISCONNECTING /* in process of disconnecting */
71} socket_state;
72
73#define SO_ACCEPTCON (1<<16) /* performed a listen */
74#define SO_WAITDATA (1<<17) /* wait data to read */
75#define SO_NOSPACE (1<<18) /* no space to write */
76
77/* Standard printout size */
78#define PRINT_IP_MAX_SIZE 23
79#define PRINT_NET_CONN "%s %6ld %6ld %-23s %-23s %-12s\n"
80#define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State\n"
81
82/* When there are IPv6 connections the IPv6 addresses will be
83 * truncated to none-recognition. The '-W' option makes the
84 * address columns wide enough to accomodate for longest possible
85 * IPv6 addresses, i.e. addresses of the form
86 * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
87 */
88#define PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
89#define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s\n"
90#define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State\n"
91
92static const char *net_conn_line = PRINT_NET_CONN;
93
94
95#if ENABLE_FEATURE_IPV6
96static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
97{
98 char addr6[INET6_ADDRSTRLEN];
99 struct in6_addr in6;
100
101 sscanf(local_addr, "%08X%08X%08X%08X",
102 &in6.s6_addr32[0], &in6.s6_addr32[1],
103 &in6.s6_addr32[2], &in6.s6_addr32[3]);
104 inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
105 inet_pton(AF_INET6, addr6, (struct sockaddr *) &localaddr->sin6_addr);
106
107 localaddr->sin6_family = AF_INET6;
108}
109#endif
110
111#if ENABLE_FEATURE_IPV6
112static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr)
113#else
114static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
115#endif
116{
117 sscanf(local_addr, "%X",
118 &((struct sockaddr_in *) localaddr)->sin_addr.s_addr);
119 ((struct sockaddr *) localaddr)->sa_family = AF_INET;
120}
121
122static const char *get_sname(int port, const char *proto, int numeric)
123{
124 if (!port)
125 return "*";
126 if (!numeric) {
127 struct servent *se = getservbyport(port, proto);
128 if (se)
129 return se->s_name;
130 }
131 /* hummm, we may return static buffer here!! */
132 return itoa(ntohs(port));
133}
134
135static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
136{
137 enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) };
138 char *host, *host_port;
139
140 /* Code which used "*" for INADDR_ANY is removed: it's ambiguous in IPv6,
141 * while "0.0.0.0" is not. */
142
143 host = numeric ? xmalloc_sockaddr2dotted_noport(addr)
144 : xmalloc_sockaddr2host_noport(addr);
145
146 host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
147 free(host);
148 return host_port;
149}
150
151static void tcp_do_one(int lnr, const char *line)
152{
153 char local_addr[64], rem_addr[64];
154 char more[512];
155 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
156#if ENABLE_FEATURE_IPV6
157 struct sockaddr_in6 localaddr, remaddr;
158#else
159 struct sockaddr_in localaddr, remaddr;
160#endif
161 unsigned long rxq, txq, time_len, retr, inode;
162
163 if (lnr == 0)
164 return;
165
166 more[0] = '\0';
167 num = sscanf(line,
168 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
169 &d, local_addr, &local_port,
170 rem_addr, &rem_port, &state,
171 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
172
173 if (strlen(local_addr) > 8) {
174#if ENABLE_FEATURE_IPV6
175 build_ipv6_addr(local_addr, &localaddr);
176 build_ipv6_addr(rem_addr, &remaddr);
177#endif
178 } else {
179 build_ipv4_addr(local_addr, &localaddr);
180 build_ipv4_addr(rem_addr, &remaddr);
181 }
182
183 if (num < 10) {
184 bb_error_msg("warning, got bogus tcp line");
185 return;
186 }
187
188 if ((rem_port && (flags & NETSTAT_CONNECTED))
189 || (!rem_port && (flags & NETSTAT_LISTENING))
190 ) {
191 char *l = ip_port_str(
192 (struct sockaddr *) &localaddr, local_port,
193 "tcp", flags & NETSTAT_NUMERIC);
194 char *r = ip_port_str(
195 (struct sockaddr *) &remaddr, rem_port,
196 "tcp", flags & NETSTAT_NUMERIC);
197 printf(net_conn_line,
198 "tcp", rxq, txq, l, r, tcp_state[state]);
199 free(l);
200 free(r);
201 }
202}
203
204static void udp_do_one(int lnr, const char *line)
205{
206 char local_addr[64], rem_addr[64];
207 const char *state_str;
208 char more[512];
209 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
210#if ENABLE_FEATURE_IPV6
211 struct sockaddr_in6 localaddr, remaddr;
212#else
213 struct sockaddr_in localaddr, remaddr;
214#endif
215 unsigned long rxq, txq, time_len, retr, inode;
216
217 if (lnr == 0)
218 return;
219
220 more[0] = '\0';
221 num = sscanf(line,
222 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
223 &d, local_addr, &local_port,
224 rem_addr, &rem_port, &state,
225 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
226
227 if (strlen(local_addr) > 8) {
228#if ENABLE_FEATURE_IPV6
229 /* Demangle what the kernel gives us */
230 build_ipv6_addr(local_addr, &localaddr);
231 build_ipv6_addr(rem_addr, &remaddr);
232#endif
233 } else {
234 build_ipv4_addr(local_addr, &localaddr);
235 build_ipv4_addr(rem_addr, &remaddr);
236 }
237
238 if (num < 10) {
239 bb_error_msg("warning, got bogus udp line");
240 return;
241 }
242 switch (state) {
243 case TCP_ESTABLISHED:
244 state_str = "ESTABLISHED";
245 break;
246 case TCP_CLOSE:
247 state_str = "";
248 break;
249 default:
250 state_str = "UNKNOWN";
251 break;
252 }
253
254#if ENABLE_FEATURE_IPV6
255# define notnull(A) ( \
256 ( (A.sin6_family == AF_INET6) \
257 && (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \
258 A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3]) \
259 ) || ( \
260 (A.sin6_family == AF_INET) \
261 && ((struct sockaddr_in*)&A)->sin_addr.s_addr \
262 ) \
263)
264#else
265# define notnull(A) (A.sin_addr.s_addr)
266#endif
267 {
268 int have_remaddr = notnull(remaddr);
269 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
270 || (!have_remaddr && (flags & NETSTAT_LISTENING))
271 ) {
272 char *l = ip_port_str(
273 (struct sockaddr *) &localaddr, local_port,
274 "udp", flags & NETSTAT_NUMERIC);
275 char *r = ip_port_str(
276 (struct sockaddr *) &remaddr, rem_port,
277 "udp", flags & NETSTAT_NUMERIC);
278 printf(net_conn_line,
279 "udp", rxq, txq, l, r, state_str);
280 free(l);
281 free(r);
282 }
283 }
284}
285
286static void raw_do_one(int lnr, const char *line)
287{
288 char local_addr[64], rem_addr[64];
289 char more[512];
290 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
291#if ENABLE_FEATURE_IPV6
292 struct sockaddr_in6 localaddr, remaddr;
293#else
294 struct sockaddr_in localaddr, remaddr;
295#endif
296 unsigned long rxq, txq, time_len, retr, inode;
297
298 if (lnr == 0)
299 return;
300
301 more[0] = '\0';
302 num = sscanf(line,
303 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
304 &d, local_addr, &local_port,
305 rem_addr, &rem_port, &state,
306 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
307
308 if (strlen(local_addr) > 8) {
309#if ENABLE_FEATURE_IPV6
310 build_ipv6_addr(local_addr, &localaddr);
311 build_ipv6_addr(rem_addr, &remaddr);
312#endif
313 } else {
314 build_ipv4_addr(local_addr, &localaddr);
315 build_ipv4_addr(rem_addr, &remaddr);
316 }
317
318 if (num < 10) {
319 bb_error_msg("warning, got bogus raw line");
320 return;
321 }
322
323 {
324 int have_remaddr = notnull(remaddr);
325 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
326 || (!have_remaddr && (flags & NETSTAT_LISTENING))
327 ) {
328 char *l = ip_port_str(
329 (struct sockaddr *) &localaddr, local_port,
330 "raw", flags & NETSTAT_NUMERIC);
331 char *r = ip_port_str(
332 (struct sockaddr *) &remaddr, rem_port,
333 "raw", flags & NETSTAT_NUMERIC);
334 printf(net_conn_line,
335 "raw", rxq, txq, l, r, itoa(state));
336 free(l);
337 free(r);
338 }
339 }
340}
341
342static void unix_do_one(int nr, const char *line)
343{
344 static smallint has_inode = 0;
345
346 char path[PATH_MAX], ss_flags[32];
347 const char *ss_proto, *ss_state, *ss_type;
348 int num, state, type, inode;
349 void *d;
350 unsigned long refcnt, proto, unix_flags;
351
352 if (nr == 0) {
353 if (strstr(line, "Inode"))
354 has_inode = 1;
355 return;
356 }
357 path[0] = '\0';
358 num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s",
359 &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path);
360 if (num < 6) {
361 bb_error_msg("warning, got bogus unix line");
362 return;
363 }
364 if (!has_inode)
365 sprintf(path, "%d", inode);
366
367 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
368 if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
369 if (!(flags & NETSTAT_LISTENING))
370 return;
371 } else {
372 if (!(flags & NETSTAT_CONNECTED))
373 return;
374 }
375 }
376
377 switch (proto) {
378 case 0:
379 ss_proto = "unix";
380 break;
381 default:
382 ss_proto = "??";
383 }
384
385 switch (type) {
386 case SOCK_STREAM:
387 ss_type = "STREAM";
388 break;
389 case SOCK_DGRAM:
390 ss_type = "DGRAM";
391 break;
392 case SOCK_RAW:
393 ss_type = "RAW";
394 break;
395 case SOCK_RDM:
396 ss_type = "RDM";
397 break;
398 case SOCK_SEQPACKET:
399 ss_type = "SEQPACKET";
400 break;
401 default:
402 ss_type = "UNKNOWN";
403 }
404
405 switch (state) {
406 case SS_FREE:
407 ss_state = "FREE";
408 break;
409 case SS_UNCONNECTED:
410 /*
411 * Unconnected sockets may be listening
412 * for something.
413 */
414 if (unix_flags & SO_ACCEPTCON) {
415 ss_state = "LISTENING";
416 } else {
417 ss_state = "";
418 }
419 break;
420 case SS_CONNECTING:
421 ss_state = "CONNECTING";
422 break;
423 case SS_CONNECTED:
424 ss_state = "CONNECTED";
425 break;
426 case SS_DISCONNECTING:
427 ss_state = "DISCONNECTING";
428 break;
429 default:
430 ss_state = "UNKNOWN";
431 }
432
433 strcpy(ss_flags, "[ ");
434 if (unix_flags & SO_ACCEPTCON)
435 strcat(ss_flags, "ACC ");
436 if (unix_flags & SO_WAITDATA)
437 strcat(ss_flags, "W ");
438 if (unix_flags & SO_NOSPACE)
439 strcat(ss_flags, "N ");
440 strcat(ss_flags, "]");
441
442 printf("%-5s %-6ld %-11s %-10s %-13s ",
443 ss_proto, refcnt, ss_flags, ss_type, ss_state);
444 if (has_inode)
445 printf("%-6d ", inode);
446 else
447 printf("- ");
448 puts(path);
449}
450
451#define _PATH_PROCNET_UDP "/proc/net/udp"
452#define _PATH_PROCNET_UDP6 "/proc/net/udp6"
453#define _PATH_PROCNET_TCP "/proc/net/tcp"
454#define _PATH_PROCNET_TCP6 "/proc/net/tcp6"
455#define _PATH_PROCNET_RAW "/proc/net/raw"
456#define _PATH_PROCNET_RAW6 "/proc/net/raw6"
457#define _PATH_PROCNET_UNIX "/proc/net/unix"
458
459static void do_info(const char *file, const char *name, void (*proc)(int, const char *))
460{
461 int lnr = 0;
462 FILE *procinfo;
463
464 procinfo = fopen(file, "r");
465 if (procinfo == NULL) {
466 if (errno != ENOENT) {
467 bb_perror_msg("%s", file);
468 } else {
469 bb_error_msg("no support for '%s' on this system", name);
470 }
471 return;
472 }
473 do {
474 char *buffer = xmalloc_fgets(procinfo);
475 if (buffer) {
476 (proc)(lnr++, buffer);
477 free(buffer);
478 }
479 } while (!feof(procinfo));
480 fclose(procinfo);
481}
482
483/*
484 * Our main function.
485 */
486
487int netstat_main(int argc, char **argv);
488int netstat_main(int argc, char **argv)
489{
490 const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
491 unsigned opt;
492#if ENABLE_FEATURE_IPV6
493 smallint inet = 1;
494 smallint inet6 = 1;
495#else
496 enum { inet = 1, inet6 = 0 };
497#endif
498
499 /* Option string must match NETSTAT_xxx constants */
500 opt = getopt32(argv, NETSTAT_OPTS);
501 if (opt & 0x1) { // -l
502 flags &= ~NETSTAT_CONNECTED;
503 flags |= NETSTAT_LISTENING;
504 }
505 if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
506 //if (opt & 0x4) // -e
507 if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n
508 //if (opt & 0x10) // -t: NETSTAT_TCP
509 //if (opt & 0x20) // -u: NETSTAT_UDP
510 //if (opt & 0x40) // -w: NETSTAT_RAW
511 //if (opt & 0x80) // -x: NETSTAT_UNIX
512 if (opt & OPT_showroute) { // -r
513#if ENABLE_ROUTE
514 bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
515 return 0;
516#else
517 bb_show_usage();
518#endif
519 }
520
521 if (opt & OPT_widedisplay) { // -W
522 net_conn_line = PRINT_NET_CONN_WIDE;
523 net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
524 }
525
526 opt &= NETSTAT_ALLPROTO;
527 if (opt) {
528 flags &= ~NETSTAT_ALLPROTO;
529 flags |= opt;
530 }
531 if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
532 printf("Active Internet connections "); /* xxx */
533
534 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
535 printf("(servers and established)");
536 else if (flags & NETSTAT_LISTENING)
537 printf("(only servers)");
538 else
539 printf("(w/o servers)");
540 printf(net_conn_line_header, "Local Address", "Foreign Address");
541 }
542 if (inet && flags & NETSTAT_TCP)
543 do_info(_PATH_PROCNET_TCP, "AF INET (tcp)", tcp_do_one);
544#if ENABLE_FEATURE_IPV6
545 if (inet6 && flags & NETSTAT_TCP)
546 do_info(_PATH_PROCNET_TCP6, "AF INET6 (tcp)", tcp_do_one);
547#endif
548 if (inet && flags & NETSTAT_UDP)
549 do_info(_PATH_PROCNET_UDP, "AF INET (udp)", udp_do_one);
550#if ENABLE_FEATURE_IPV6
551 if (inet6 && flags & NETSTAT_UDP)
552 do_info(_PATH_PROCNET_UDP6, "AF INET6 (udp)", udp_do_one);
553#endif
554 if (inet && flags & NETSTAT_RAW)
555 do_info(_PATH_PROCNET_RAW, "AF INET (raw)", raw_do_one);
556#if ENABLE_FEATURE_IPV6
557 if (inet6 && flags & NETSTAT_RAW)
558 do_info(_PATH_PROCNET_RAW6, "AF INET6 (raw)", raw_do_one);
559#endif
560 if (flags & NETSTAT_UNIX) {
561 printf("Active UNIX domain sockets ");
562 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
563 printf("(servers and established)");
564 else if (flags & NETSTAT_LISTENING)
565 printf("(only servers)");
566 else
567 printf("(w/o servers)");
568 printf("\nProto RefCnt Flags Type State I-Node Path\n");
569 do_info(_PATH_PROCNET_UNIX, "AF UNIX", unix_do_one);
570 }
571 return 0;
572}
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