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 * 2008-07-10
12 * optional '-p' flag support ported from net-tools by G. Somlo <somlo@cmu.edu>
13 *
14 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
15 */
16 //config:config NETSTAT
17 //config: bool "netstat (10 kb)"
18 //config: default y
19 //config: help
20 //config: netstat prints information about the Linux networking subsystem.
21 //config:
22 //config:config FEATURE_NETSTAT_WIDE
23 //config: bool "Enable wide output"
24 //config: default y
25 //config: depends on NETSTAT
26 //config: help
27 //config: Add support for wide columns. Useful when displaying IPv6 addresses
28 //config: (-W option).
29 //config:
30 //config:config FEATURE_NETSTAT_PRG
31 //config: bool "Enable PID/Program name output"
32 //config: default y
33 //config: depends on NETSTAT
34 //config: help
35 //config: Add support for -p flag to print out PID and program name.
36 //config: +700 bytes of code.
37
38 //applet:IF_NETSTAT(APPLET(netstat, BB_DIR_BIN, BB_SUID_DROP))
39
40 //kbuild:lib-$(CONFIG_NETSTAT) += netstat.o
41
42 #include "libbb.h"
43 #include "inet_common.h"
44
45 //usage:#define netstat_trivial_usage
46 //usage: "[-"IF_ROUTE("r")"al] [-tuwx] [-en"IF_FEATURE_NETSTAT_WIDE("W")IF_FEATURE_NETSTAT_PRG("p")"]"
47 //usage:#define netstat_full_usage "\n\n"
48 //usage: "Display networking information\n"
49 //usage: IF_ROUTE(
50 //usage: "\n -r Routing table"
51 //usage: )
52 //usage: "\n -a All sockets"
53 //usage: "\n -l Listening sockets"
54 //usage: "\n Else: connected sockets"
55 //usage: "\n -t TCP sockets"
56 //usage: "\n -u UDP sockets"
57 //usage: "\n -w Raw sockets"
58 //usage: "\n -x Unix sockets"
59 //usage: "\n Else: all socket types"
60 //usage: "\n -e Other/more information"
61 //usage: "\n -n Don't resolve names"
62 //usage: IF_FEATURE_NETSTAT_WIDE(
63 //usage: "\n -W Wide display"
64 //usage: )
65 //usage: IF_FEATURE_NETSTAT_PRG(
66 //usage: "\n -p Show PID/program name for sockets"
67 //usage: )
68
69 #define NETSTAT_OPTS "laentuwx" \
70 IF_ROUTE( "r") \
71 IF_FEATURE_NETSTAT_WIDE("W") \
72 IF_FEATURE_NETSTAT_PRG( "p")
73
74 enum {
75 OPT_sock_listen = 1 << 0, // l
76 OPT_sock_all = 1 << 1, // a
77 OPT_extended = 1 << 2, // e
78 OPT_noresolve = 1 << 3, // n
79 OPT_sock_tcp = 1 << 4, // t
80 OPT_sock_udp = 1 << 5, // u
81 OPT_sock_raw = 1 << 6, // w
82 OPT_sock_unix = 1 << 7, // x
83 OPTBIT_x = 7,
84 IF_ROUTE( OPTBIT_ROUTE,)
85 IF_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
86 IF_FEATURE_NETSTAT_PRG( OPTBIT_PRG ,)
87 OPT_route = IF_ROUTE( (1 << OPTBIT_ROUTE)) + 0, // r
88 OPT_wide = IF_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W
89 OPT_prg = IF_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG )) + 0, // p
90 };
91
92 #define NETSTAT_CONNECTED 0x01
93 #define NETSTAT_LISTENING 0x02
94 #define NETSTAT_NUMERIC 0x04
95 /* Must match getopt32 option string */
96 #define NETSTAT_TCP 0x10
97 #define NETSTAT_UDP 0x20
98 #define NETSTAT_RAW 0x40
99 #define NETSTAT_UNIX 0x80
100 #define NETSTAT_ALLPROTO (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX)
101
102
103 enum {
104 TCP_ESTABLISHED = 1,
105 TCP_SYN_SENT,
106 TCP_SYN_RECV,
107 TCP_FIN_WAIT1,
108 TCP_FIN_WAIT2,
109 TCP_TIME_WAIT,
110 TCP_CLOSE,
111 TCP_CLOSE_WAIT,
112 TCP_LAST_ACK,
113 TCP_LISTEN,
114 TCP_CLOSING, /* now a valid state */
115 };
116
117 static const char *const tcp_state[] ALIGN_PTR = {
118 "",
119 "ESTABLISHED",
120 "SYN_SENT",
121 "SYN_RECV",
122 "FIN_WAIT1",
123 "FIN_WAIT2",
124 "TIME_WAIT",
125 "CLOSE",
126 "CLOSE_WAIT",
127 "LAST_ACK",
128 "LISTEN",
129 "CLOSING"
130 };
131
132 typedef enum {
133 SS_FREE = 0, /* not allocated */
134 SS_UNCONNECTED, /* unconnected to any socket */
135 SS_CONNECTING, /* in process of connecting */
136 SS_CONNECTED, /* connected to socket */
137 SS_DISCONNECTING /* in process of disconnecting */
138 } socket_state;
139
140 #define SO_ACCEPTCON (1<<16) /* performed a listen */
141 #define SO_WAITDATA (1<<17) /* wait data to read */
142 #define SO_NOSPACE (1<<18) /* no space to write */
143
144 #define ADDR_NORMAL_WIDTH 23
145 /* When there are IPv6 connections the IPv6 addresses will be
146 * truncated to none-recognition. The '-W' option makes the
147 * address columns wide enough to accommodate for longest possible
148 * IPv6 addresses, i.e. addresses of the form
149 * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
150 */
151 #define ADDR_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
152 #if ENABLE_FEATURE_NETSTAT_WIDE
153 # define FMT_NET_CONN_DATA "%s %6lu %6lu %-*s %-*s %-12s"
154 # define FMT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-*s %-*s State %s\n"
155 #else
156 # define FMT_NET_CONN_DATA "%s %6lu %6lu %-23s %-23s %-12s"
157 # define FMT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State %s\n"
158 #endif
159
160 #define PROGNAME_WIDTH 20
161 #define PROGNAME_WIDTH_STR "20"
162 /* PROGNAME_WIDTH chars: 12345678901234567890 */
163 #define PROGNAME_BANNER "PID/Program name "
164
165 struct prg_node {
166 struct prg_node *next;
167 long inode;
168 char name[PROGNAME_WIDTH];
169 };
170
171 #define PRG_HASH_SIZE 211
172
173 struct globals {
174 smalluint flags;
175 #if ENABLE_FEATURE_NETSTAT_PRG
176 smallint prg_cache_loaded;
177 struct prg_node *prg_hash[PRG_HASH_SIZE];
178 #endif
179 #if ENABLE_FEATURE_NETSTAT_PRG
180 const char *progname_banner;
181 #endif
182 #if ENABLE_FEATURE_NETSTAT_WIDE
183 unsigned addr_width;
184 #endif
185 };
186 #define G (*ptr_to_globals)
187 #define flags (G.flags )
188 #define prg_cache_loaded (G.prg_cache_loaded)
189 #define prg_hash (G.prg_hash )
190 #if ENABLE_FEATURE_NETSTAT_PRG
191 # define progname_banner (G.progname_banner )
192 #else
193 # define progname_banner ""
194 #endif
195 #define INIT_G() do { \
196 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
197 flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; \
198 } while (0)
199
200
201 #if ENABLE_FEATURE_NETSTAT_PRG
202
203 /* Deliberately truncating long to unsigned *int* */
204 #define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)
205
prg_cache_add(long inode,char * name)206 static void prg_cache_add(long inode, char *name)
207 {
208 unsigned hi = PRG_HASHIT(inode);
209 struct prg_node **pnp, *pn;
210
211 prg_cache_loaded = 2;
212 for (pnp = prg_hash + hi; (pn = *pnp) != NULL; pnp = &pn->next) {
213 if (pn->inode == inode) {
214 /* Some warning should be appropriate here
215 * as we got multiple processes for one i-node */
216 return;
217 }
218 }
219 *pnp = xzalloc(sizeof(struct prg_node));
220 pn = *pnp;
221 pn->inode = inode;
222 safe_strncpy(pn->name, name, PROGNAME_WIDTH);
223 }
224
prg_cache_get(long inode)225 static const char *prg_cache_get(long inode)
226 {
227 unsigned hi = PRG_HASHIT(inode);
228 struct prg_node *pn;
229
230 for (pn = prg_hash[hi]; pn; pn = pn->next)
231 if (pn->inode == inode)
232 return pn->name;
233 return "-";
234 }
235
236 #if ENABLE_FEATURE_CLEAN_UP
prg_cache_clear(void)237 static void prg_cache_clear(void)
238 {
239 struct prg_node **pnp, *pn;
240
241 for (pnp = prg_hash; pnp < prg_hash + PRG_HASH_SIZE; pnp++) {
242 while ((pn = *pnp) != NULL) {
243 *pnp = pn->next;
244 free(pn);
245 }
246 }
247 }
248 #else
249 #define prg_cache_clear() ((void)0)
250 #endif
251
extract_socket_inode(const char * lname)252 static long extract_socket_inode(const char *lname)
253 {
254 long inode = -1;
255
256 if (is_prefixed_with(lname, "socket:[")) {
257 /* "socket:[12345]", extract the "12345" as inode */
258 inode = bb_strtoul(lname + sizeof("socket:[")-1, (char**)&lname, 0);
259 if (*lname != ']')
260 inode = -1;
261 } else if (is_prefixed_with(lname, "[0000]:")) {
262 /* "[0000]:12345", extract the "12345" as inode */
263 inode = bb_strtoul(lname + sizeof("[0000]:")-1, NULL, 0);
264 if (errno) /* not NUL terminated? */
265 inode = -1;
266 }
267
268 #if 0 /* bb_strtol returns all-ones bit pattern on ERANGE anyway */
269 if (errno == ERANGE)
270 inode = -1;
271 #endif
272 return inode;
273 }
274
add_to_prg_cache_if_socket(struct recursive_state * state,const char * fileName,struct stat * statbuf UNUSED_PARAM)275 static int FAST_FUNC add_to_prg_cache_if_socket(struct recursive_state *state,
276 const char *fileName,
277 struct stat *statbuf UNUSED_PARAM)
278 {
279 char *linkname;
280 long inode;
281
282 linkname = xmalloc_readlink(fileName);
283 if (linkname != NULL) {
284 inode = extract_socket_inode(linkname);
285 free(linkname);
286 if (inode >= 0) {
287 char *pid_slash_progname = state->userData;
288 prg_cache_add(inode, pid_slash_progname);
289 }
290 }
291 return TRUE;
292 }
293
dir_act(struct recursive_state * state,const char * fileName,struct stat * statbuf UNUSED_PARAM)294 static int FAST_FUNC dir_act(struct recursive_state *state,
295 const char *fileName,
296 struct stat *statbuf UNUSED_PARAM)
297 {
298 const char *pid;
299 char *pid_slash_progname;
300 char proc_pid_fname[sizeof("/proc/%u/cmdline") + sizeof(long)*3];
301 char cmdline_buf[512];
302 int n, len;
303
304 if (state->depth == 0) /* "/proc" itself */
305 return TRUE; /* continue looking one level below /proc */
306
307 pid = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
308 if (!isdigit(pid[0])) /* skip /proc entries which aren't processes */
309 return SKIP;
310
311 len = snprintf(proc_pid_fname, sizeof(proc_pid_fname), "%s/cmdline", fileName);
312 n = open_read_close(proc_pid_fname, cmdline_buf, sizeof(cmdline_buf) - 1);
313 if (n < 0)
314 return FALSE;
315 cmdline_buf[n] = '\0';
316
317 /* go through all files in /proc/PID/fd and check whether they are sockets */
318 strcpy(proc_pid_fname + len - (sizeof("cmdline")-1), "fd");
319 pid_slash_progname = concat_path_file(pid, bb_basename(cmdline_buf)); /* "PID/argv0" */
320 n = recursive_action(proc_pid_fname,
321 ACTION_RECURSE | ACTION_QUIET,
322 add_to_prg_cache_if_socket,
323 NULL,
324 (void *)pid_slash_progname
325 );
326 free(pid_slash_progname);
327
328 if (!n)
329 return FALSE; /* signal permissions error to caller */
330
331 return SKIP; /* caller should not recurse further into this dir */
332 }
333
prg_cache_load(void)334 static void prg_cache_load(void)
335 {
336 int load_ok;
337
338 prg_cache_loaded = 1;
339 load_ok = recursive_action("/proc", ACTION_RECURSE | ACTION_QUIET,
340 NULL, dir_act, NULL);
341 if (load_ok)
342 return;
343
344 if (prg_cache_loaded == 1)
345 bb_simple_error_msg("can't scan /proc - are you root?");
346 else
347 bb_simple_error_msg("showing only processes with your user ID");
348 }
349
350 #else
351
352 #define prg_cache_clear() ((void)0)
353
354 #endif //ENABLE_FEATURE_NETSTAT_PRG
355
356
357 #if ENABLE_FEATURE_IPV6
build_ipv6_addr(char * local_addr,struct sockaddr_in6 * localaddr)358 static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
359 {
360 char addr6[INET6_ADDRSTRLEN];
361 struct in6_addr in6;
362
363 sscanf(local_addr, "%08X%08X%08X%08X",
364 &in6.s6_addr32[0], &in6.s6_addr32[1],
365 &in6.s6_addr32[2], &in6.s6_addr32[3]);
366 inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
367 inet_pton(AF_INET6, addr6, &localaddr->sin6_addr);
368
369 localaddr->sin6_family = AF_INET6;
370 }
371 #endif
372
build_ipv4_addr(char * local_addr,struct sockaddr_in * localaddr)373 static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
374 {
375 sscanf(local_addr, "%X", &localaddr->sin_addr.s_addr);
376 localaddr->sin_family = AF_INET;
377 }
378
get_sname(int port,const char * proto,int numeric)379 static const char *get_sname(int port, const char *proto, int numeric)
380 {
381 if (!port)
382 return "*";
383 if (!numeric) {
384 struct servent *se = getservbyport(port, proto);
385 if (se)
386 return se->s_name;
387 }
388 /* hummm, we may return static buffer here!! */
389 return itoa(ntohs(port));
390 }
391
ip_port_str(struct sockaddr * addr,int port,const char * proto,int numeric)392 static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
393 {
394 char *host, *host_port;
395
396 /* Code which used "*" for INADDR_ANY is removed: it's ambiguous
397 * in IPv6, while "0.0.0.0" is not. */
398
399 host = NULL;
400 if (!numeric)
401 host = xmalloc_sockaddr2host_noport(addr);
402 if (!host)
403 host = xmalloc_sockaddr2dotted_noport(addr);
404
405 host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
406 free(host);
407 return host_port;
408 }
409
410 struct inet_params {
411 int local_port, rem_port, state, uid;
412 union {
413 struct sockaddr sa;
414 struct sockaddr_in sin;
415 #if ENABLE_FEATURE_IPV6
416 struct sockaddr_in6 sin6;
417 #endif
418 } localaddr, remaddr;
419 unsigned long rxq, txq, inode;
420 };
421
scan_inet_proc_line(struct inet_params * param,char * line)422 static int scan_inet_proc_line(struct inet_params *param, char *line)
423 {
424 int num;
425 /* IPv6 /proc files use 32-char hex representation
426 * of IPv6 address, followed by :PORT_IN_HEX
427 */
428 char local_addr[33], rem_addr[33]; /* 32 + 1 for NUL */
429
430 num = sscanf(line,
431 "%*d: %32[0-9A-Fa-f]:%X "
432 "%32[0-9A-Fa-f]:%X %X "
433 "%lX:%lX %*X:%*X "
434 "%*X %d %*d %lu ",
435 local_addr, ¶m->local_port,
436 rem_addr, ¶m->rem_port, ¶m->state,
437 ¶m->txq, ¶m->rxq,
438 ¶m->uid, ¶m->inode);
439 if (num < 9) {
440 return 1; /* error */
441 }
442
443 if (strlen(local_addr) > 8) {
444 #if ENABLE_FEATURE_IPV6
445 build_ipv6_addr(local_addr, ¶m->localaddr.sin6);
446 build_ipv6_addr(rem_addr, ¶m->remaddr.sin6);
447 #endif
448 } else {
449 build_ipv4_addr(local_addr, ¶m->localaddr.sin);
450 build_ipv4_addr(rem_addr, ¶m->remaddr.sin);
451 }
452 return 0;
453 }
454
print_inet_line(struct inet_params * param,const char * state_str,const char * proto,int is_connected)455 static void print_inet_line(struct inet_params *param,
456 const char *state_str, const char *proto, int is_connected)
457 {
458 if ((is_connected && (flags & NETSTAT_CONNECTED))
459 || (!is_connected && (flags & NETSTAT_LISTENING))
460 ) {
461 char *l = ip_port_str(
462 ¶m->localaddr.sa, param->local_port,
463 proto, flags & NETSTAT_NUMERIC);
464 char *r = ip_port_str(
465 ¶m->remaddr.sa, param->rem_port,
466 proto, flags & NETSTAT_NUMERIC);
467 printf(FMT_NET_CONN_DATA,
468 proto, param->rxq, param->txq,
469 IF_FEATURE_NETSTAT_WIDE(G.addr_width,) l,
470 IF_FEATURE_NETSTAT_WIDE(G.addr_width,) r,
471 state_str);
472 #if ENABLE_FEATURE_NETSTAT_PRG
473 if (option_mask32 & OPT_prg)
474 printf("%."PROGNAME_WIDTH_STR"s", prg_cache_get(param->inode));
475 #endif
476 bb_putchar('\n');
477 free(l);
478 free(r);
479 }
480 }
481
tcp_do_one(char * line)482 static int FAST_FUNC tcp_do_one(char *line)
483 {
484 struct inet_params param;
485
486 memset(¶m, 0, sizeof(param));
487 if (scan_inet_proc_line(¶m, line))
488 return 1;
489
490 print_inet_line(¶m, tcp_state[param.state], "tcp", param.rem_port);
491 return 0;
492 }
493
494 #if ENABLE_FEATURE_IPV6
495 # define NOT_NULL_ADDR(A) ( \
496 ( (A.sa.sa_family == AF_INET6) \
497 && (A.sin6.sin6_addr.s6_addr32[0] | A.sin6.sin6_addr.s6_addr32[1] | \
498 A.sin6.sin6_addr.s6_addr32[2] | A.sin6.sin6_addr.s6_addr32[3]) \
499 ) || ( \
500 (A.sa.sa_family == AF_INET) \
501 && A.sin.sin_addr.s_addr != 0 \
502 ) \
503 )
504 #else
505 # define NOT_NULL_ADDR(A) (A.sin.sin_addr.s_addr)
506 #endif
507
udp_do_one(char * line)508 static int FAST_FUNC udp_do_one(char *line)
509 {
510 int have_remaddr;
511 const char *state_str;
512 struct inet_params param;
513
514 memset(¶m, 0, sizeof(param)); /* otherwise we display garbage IPv6 scope_ids */
515 if (scan_inet_proc_line(¶m, line))
516 return 1;
517
518 state_str = "UNKNOWN";
519 switch (param.state) {
520 case TCP_ESTABLISHED:
521 state_str = "ESTABLISHED";
522 break;
523 case TCP_CLOSE:
524 state_str = "";
525 break;
526 }
527
528 have_remaddr = NOT_NULL_ADDR(param.remaddr);
529 print_inet_line(¶m, state_str, "udp", have_remaddr);
530 return 0;
531 }
532
raw_do_one(char * line)533 static int FAST_FUNC raw_do_one(char *line)
534 {
535 int have_remaddr;
536 struct inet_params param;
537
538 if (scan_inet_proc_line(¶m, line))
539 return 1;
540
541 have_remaddr = NOT_NULL_ADDR(param.remaddr);
542 print_inet_line(¶m, itoa(param.state), "raw", have_remaddr);
543 return 0;
544 }
545
unix_do_one(char * line)546 static int FAST_FUNC unix_do_one(char *line)
547 {
548 unsigned long refcnt, proto, unix_flags;
549 unsigned long inode;
550 int type, state;
551 int num, path_ofs;
552 const char *ss_proto, *ss_state, *ss_type;
553 char ss_flags[32];
554
555 /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
556 * Other users report long lines filled by NUL bytes.
557 * (those ^@ are NUL bytes too). We see them as empty lines. */
558 if (!line[0])
559 return 0;
560
561 path_ofs = 0; /* paranoia */
562 num = sscanf(line, "%*p: %lX %lX %lX %X %X %lu %n",
563 &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
564 if (num < 6) {
565 return 1; /* error */
566 }
567 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
568 if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
569 if (!(flags & NETSTAT_LISTENING))
570 return 0;
571 } else {
572 if (!(flags & NETSTAT_CONNECTED))
573 return 0;
574 }
575 }
576
577 switch (proto) {
578 case 0:
579 ss_proto = "unix";
580 break;
581 default:
582 ss_proto = "??";
583 }
584
585 switch (type) {
586 case SOCK_STREAM:
587 ss_type = "STREAM";
588 break;
589 case SOCK_DGRAM:
590 ss_type = "DGRAM";
591 break;
592 case SOCK_RAW:
593 ss_type = "RAW";
594 break;
595 case SOCK_RDM:
596 ss_type = "RDM";
597 break;
598 case SOCK_SEQPACKET:
599 ss_type = "SEQPACKET";
600 break;
601 default:
602 ss_type = "UNKNOWN";
603 }
604
605 switch (state) {
606 case SS_FREE:
607 ss_state = "FREE";
608 break;
609 case SS_UNCONNECTED:
610 /*
611 * Unconnected sockets may be listening
612 * for something.
613 */
614 if (unix_flags & SO_ACCEPTCON) {
615 ss_state = "LISTENING";
616 } else {
617 ss_state = "";
618 }
619 break;
620 case SS_CONNECTING:
621 ss_state = "CONNECTING";
622 break;
623 case SS_CONNECTED:
624 ss_state = "CONNECTED";
625 break;
626 case SS_DISCONNECTING:
627 ss_state = "DISCONNECTING";
628 break;
629 default:
630 ss_state = "UNKNOWN";
631 }
632
633 strcpy(ss_flags, "[ ");
634 if (unix_flags & SO_ACCEPTCON)
635 strcat(ss_flags, "ACC ");
636 if (unix_flags & SO_WAITDATA)
637 strcat(ss_flags, "W ");
638 if (unix_flags & SO_NOSPACE)
639 strcat(ss_flags, "N ");
640 strcat(ss_flags, "]");
641
642 printf("%-5s %-6lu %-11s %-10s %-13s %6lu ",
643 ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
644 );
645
646 #if ENABLE_FEATURE_NETSTAT_PRG
647 if (option_mask32 & OPT_prg)
648 printf("%-"PROGNAME_WIDTH_STR"s", prg_cache_get(inode));
649 #endif
650
651 /* TODO: currently we stop at first NUL byte. Is it a problem? */
652 line += path_ofs;
653 chomp(line);
654 while (*line)
655 fputc_printable(*line++, stdout);
656 bb_putchar('\n');
657 return 0;
658 }
659
do_info(const char * file,int FAST_FUNC (* proc)(char *))660 static void do_info(const char *file, int FAST_FUNC (*proc)(char *))
661 {
662 int lnr;
663 FILE *procinfo;
664 char *buffer;
665
666 /* _stdin is just to save "r" param */
667 procinfo = fopen_or_warn_stdin(file);
668 if (procinfo == NULL) {
669 return;
670 }
671 lnr = 0;
672 /* Why xmalloc_fgets_str? because it doesn't stop on NULs */
673 while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
674 /* line 0 is skipped */
675 if (lnr && proc(buffer))
676 bb_error_msg("%s: bogus data on line %d", file, lnr + 1);
677 lnr++;
678 free(buffer);
679 }
680 fclose(procinfo);
681 }
682
683 int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
netstat_main(int argc UNUSED_PARAM,char ** argv)684 int netstat_main(int argc UNUSED_PARAM, char **argv)
685 {
686 unsigned opt;
687
688 INIT_G();
689
690 /* Option string must match NETSTAT_xxx constants */
691 opt = getopt32(argv, NETSTAT_OPTS);
692 if (opt & OPT_sock_listen) { // -l
693 flags &= ~NETSTAT_CONNECTED;
694 flags |= NETSTAT_LISTENING;
695 }
696 if (opt & OPT_sock_all) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
697 //if (opt & OPT_extended) // -e
698 if (opt & OPT_noresolve) flags |= NETSTAT_NUMERIC; // -n
699 //if (opt & OPT_sock_tcp) // -t: NETSTAT_TCP
700 //if (opt & OPT_sock_udp) // -u: NETSTAT_UDP
701 //if (opt & OPT_sock_raw) // -w: NETSTAT_RAW
702 //if (opt & OPT_sock_unix) // -x: NETSTAT_UNIX
703 #if ENABLE_ROUTE
704 if (opt & OPT_route) { // -r
705 bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
706 return 0;
707 }
708 #endif
709 #if ENABLE_FEATURE_NETSTAT_WIDE
710 G.addr_width = ADDR_NORMAL_WIDTH;
711 if (opt & OPT_wide) { // -W
712 G.addr_width = ADDR_WIDE;
713 }
714 #endif
715 #if ENABLE_FEATURE_NETSTAT_PRG
716 progname_banner = "";
717 if (opt & OPT_prg) { // -p
718 progname_banner = PROGNAME_BANNER;
719 prg_cache_load();
720 }
721 #endif
722
723 opt &= NETSTAT_ALLPROTO;
724 if (opt) {
725 flags &= ~NETSTAT_ALLPROTO;
726 flags |= opt;
727 }
728 if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
729 printf("Active Internet connections "); /* xxx */
730
731 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
732 printf("(servers and established)");
733 else if (flags & NETSTAT_LISTENING)
734 printf("(only servers)");
735 else
736 printf("(w/o servers)");
737 printf(FMT_NET_CONN_HEADER,
738 IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Local Address",
739 IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Foreign Address",
740 progname_banner
741 );
742 }
743 if (flags & NETSTAT_TCP) {
744 do_info("/proc/net/tcp", tcp_do_one);
745 #if ENABLE_FEATURE_IPV6
746 do_info("/proc/net/tcp6", tcp_do_one);
747 #endif
748 }
749 if (flags & NETSTAT_UDP) {
750 do_info("/proc/net/udp", udp_do_one);
751 #if ENABLE_FEATURE_IPV6
752 do_info("/proc/net/udp6", udp_do_one);
753 #endif
754 }
755 if (flags & NETSTAT_RAW) {
756 do_info("/proc/net/raw", raw_do_one);
757 #if ENABLE_FEATURE_IPV6
758 do_info("/proc/net/raw6", raw_do_one);
759 #endif
760 }
761 if (flags & NETSTAT_UNIX) {
762 printf("Active UNIX domain sockets ");
763 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
764 printf("(servers and established)");
765 else if (flags & NETSTAT_LISTENING)
766 printf("(only servers)");
767 else
768 printf("(w/o servers)");
769 printf("\nProto RefCnt Flags Type State I-Node %sPath\n", progname_banner);
770 do_info("/proc/net/unix", unix_do_one);
771 }
772 prg_cache_clear();
773 return 0;
774 }
775