1 /* vi: set sw=4 ts=4: */
3 * Mini netstat implementation(s) for busybox
4 * based in part on the netstat implementation from net-tools.
6 * Copyright (C) 2002 by Bart Visscher <magick@linux-fan.com>
9 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
11 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 #include "inet_common.h"
19 OPT_showroute = 0x100,
20 OPT_widedisplay = 0x200 * ENABLE_FEATURE_NETSTAT_WIDE,
22 # define NETSTAT_OPTS "laentuwxr"USE_FEATURE_NETSTAT_WIDE("W")
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)
34 static smallint flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO;
47 TCP_CLOSING /* now a valid state */
50 static const char *const tcp_state[] = {
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 */
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 */
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"
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
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"
92 static const char *net_conn_line = PRINT_NET_CONN;
95 #if ENABLE_FEATURE_IPV6
96 static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
98 char addr6[INET6_ADDRSTRLEN];
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);
107 localaddr->sin6_family = AF_INET6;
111 #if ENABLE_FEATURE_IPV6
112 static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr)
114 static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
117 sscanf(local_addr, "%X",
118 &((struct sockaddr_in *) localaddr)->sin_addr.s_addr);
119 ((struct sockaddr *) localaddr)->sa_family = AF_INET;
122 static const char *get_sname(int port, const char *proto, int numeric)
127 struct servent *se = getservbyport(port, proto);
131 /* hummm, we may return static buffer here!! */
132 return itoa(ntohs(port));
135 static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
137 enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) };
138 char *host, *host_port;
140 /* Code which used "*" for INADDR_ANY is removed: it's ambiguous in IPv6,
141 * while "0.0.0.0" is not. */
143 host = numeric ? xmalloc_sockaddr2dotted_noport(addr)
144 : xmalloc_sockaddr2host_noport(addr);
146 host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
151 static int tcp_do_one(int lnr, char *line)
153 char local_addr[64], rem_addr[64];
155 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
156 #if ENABLE_FEATURE_IPV6
157 struct sockaddr_in6 localaddr, remaddr;
159 struct sockaddr_in localaddr, remaddr;
161 unsigned long rxq, txq, time_len, retr, inode;
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);
174 return 1; /* error */
177 if (strlen(local_addr) > 8) {
178 #if ENABLE_FEATURE_IPV6
179 build_ipv6_addr(local_addr, &localaddr);
180 build_ipv6_addr(rem_addr, &remaddr);
183 build_ipv4_addr(local_addr, &localaddr);
184 build_ipv4_addr(rem_addr, &remaddr);
187 if ((rem_port && (flags & NETSTAT_CONNECTED))
188 || (!rem_port && (flags & NETSTAT_LISTENING))
190 char *l = ip_port_str(
191 (struct sockaddr *) &localaddr, local_port,
192 "tcp", flags & NETSTAT_NUMERIC);
193 char *r = ip_port_str(
194 (struct sockaddr *) &remaddr, rem_port,
195 "tcp", flags & NETSTAT_NUMERIC);
196 printf(net_conn_line,
197 "tcp", rxq, txq, l, r, tcp_state[state]);
204 static int udp_do_one(int lnr, char *line)
206 char local_addr[64], rem_addr[64];
207 const char *state_str;
209 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
210 #if ENABLE_FEATURE_IPV6
211 struct sockaddr_in6 localaddr, remaddr;
213 struct sockaddr_in localaddr, remaddr;
215 unsigned long rxq, txq, time_len, retr, inode;
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);
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);
234 build_ipv4_addr(local_addr, &localaddr);
235 build_ipv4_addr(rem_addr, &remaddr);
239 return 1; /* error */
242 case TCP_ESTABLISHED:
243 state_str = "ESTABLISHED";
249 state_str = "UNKNOWN";
253 #if ENABLE_FEATURE_IPV6
254 # define notnull(A) ( \
255 ( (A.sin6_family == AF_INET6) \
256 && (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \
257 A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3]) \
259 (A.sin6_family == AF_INET) \
260 && ((struct sockaddr_in*)&A)->sin_addr.s_addr \
264 # define notnull(A) (A.sin_addr.s_addr)
267 int have_remaddr = notnull(remaddr);
268 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
269 || (!have_remaddr && (flags & NETSTAT_LISTENING))
271 char *l = ip_port_str(
272 (struct sockaddr *) &localaddr, local_port,
273 "udp", flags & NETSTAT_NUMERIC);
274 char *r = ip_port_str(
275 (struct sockaddr *) &remaddr, rem_port,
276 "udp", flags & NETSTAT_NUMERIC);
277 printf(net_conn_line,
278 "udp", rxq, txq, l, r, state_str);
286 static int raw_do_one(int lnr, char *line)
288 char local_addr[64], rem_addr[64];
290 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
291 #if ENABLE_FEATURE_IPV6
292 struct sockaddr_in6 localaddr, remaddr;
294 struct sockaddr_in localaddr, remaddr;
296 unsigned long rxq, txq, time_len, retr, inode;
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);
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);
314 build_ipv4_addr(local_addr, &localaddr);
315 build_ipv4_addr(rem_addr, &remaddr);
319 return 1; /* error */
323 int have_remaddr = notnull(remaddr);
324 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
325 || (!have_remaddr && (flags & NETSTAT_LISTENING))
327 char *l = ip_port_str(
328 (struct sockaddr *) &localaddr, local_port,
329 "raw", flags & NETSTAT_NUMERIC);
330 char *r = ip_port_str(
331 (struct sockaddr *) &remaddr, rem_port,
332 "raw", flags & NETSTAT_NUMERIC);
333 printf(net_conn_line,
334 "raw", rxq, txq, l, r, itoa(state));
342 static int unix_do_one(int nr, char *line)
344 unsigned long refcnt, proto, unix_flags;
349 const char *ss_proto, *ss_state, *ss_type;
353 return 0; /* skip header */
355 /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
356 * Other users report long lines filled by NUL bytes.
357 * (those ^@ are NUL bytes too). We see them as empty lines. */
361 path_ofs = 0; /* paranoia */
362 num = sscanf(line, "%p: %lX %lX %lX %X %X %lu %n",
363 &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
365 return 1; /* error */
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))
372 if (!(flags & NETSTAT_CONNECTED))
399 ss_type = "SEQPACKET";
411 * Unconnected sockets may be listening
414 if (unix_flags & SO_ACCEPTCON) {
415 ss_state = "LISTENING";
421 ss_state = "CONNECTING";
424 ss_state = "CONNECTED";
426 case SS_DISCONNECTING:
427 ss_state = "DISCONNECTING";
430 ss_state = "UNKNOWN";
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, "]");
442 printf("%-5s %-6ld %-11s %-10s %-13s %6lu ",
443 ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
446 /* TODO: currently we stop at first NUL byte. Is it a problem? */
448 *strchrnul(line, '\n') = '\0';
450 fputc_printable(*line++, stdout);
455 #define _PATH_PROCNET_UDP "/proc/net/udp"
456 #define _PATH_PROCNET_UDP6 "/proc/net/udp6"
457 #define _PATH_PROCNET_TCP "/proc/net/tcp"
458 #define _PATH_PROCNET_TCP6 "/proc/net/tcp6"
459 #define _PATH_PROCNET_RAW "/proc/net/raw"
460 #define _PATH_PROCNET_RAW6 "/proc/net/raw6"
461 #define _PATH_PROCNET_UNIX "/proc/net/unix"
463 static void do_info(const char *file, const char *name, int (*proc)(int, char *))
469 procinfo = fopen(file, "r");
470 if (procinfo == NULL) {
471 if (errno != ENOENT) {
472 bb_simple_perror_msg(file);
474 bb_error_msg("no kernel support for %s", name);
479 /* Why? because xmalloc_fgets_str doesn't stop on NULs */
480 while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
481 if (proc(lnr++, buffer))
482 bb_error_msg("%s: bogus data on line %d", file, lnr);
488 int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
489 int netstat_main(int argc ATTRIBUTE_UNUSED, char **argv)
491 const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
493 #if ENABLE_FEATURE_IPV6
497 enum { inet = 1, inet6 = 0 };
500 /* Option string must match NETSTAT_xxx constants */
501 opt = getopt32(argv, NETSTAT_OPTS);
502 if (opt & 0x1) { // -l
503 flags &= ~NETSTAT_CONNECTED;
504 flags |= NETSTAT_LISTENING;
506 if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
507 //if (opt & 0x4) // -e
508 if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n
509 //if (opt & 0x10) // -t: NETSTAT_TCP
510 //if (opt & 0x20) // -u: NETSTAT_UDP
511 //if (opt & 0x40) // -w: NETSTAT_RAW
512 //if (opt & 0x80) // -x: NETSTAT_UNIX
513 if (opt & OPT_showroute) { // -r
515 bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
522 if (opt & OPT_widedisplay) { // -W
523 net_conn_line = PRINT_NET_CONN_WIDE;
524 net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
527 opt &= NETSTAT_ALLPROTO;
529 flags &= ~NETSTAT_ALLPROTO;
532 if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
533 printf("Active Internet connections "); /* xxx */
535 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
536 printf("(servers and established)");
537 else if (flags & NETSTAT_LISTENING)
538 printf("(only servers)");
540 printf("(w/o servers)");
541 printf(net_conn_line_header, "Local Address", "Foreign Address");
543 if (inet && flags & NETSTAT_TCP)
544 do_info(_PATH_PROCNET_TCP, "AF INET (tcp)", tcp_do_one);
545 #if ENABLE_FEATURE_IPV6
546 if (inet6 && flags & NETSTAT_TCP)
547 do_info(_PATH_PROCNET_TCP6, "AF INET6 (tcp)", tcp_do_one);
549 if (inet && flags & NETSTAT_UDP)
550 do_info(_PATH_PROCNET_UDP, "AF INET (udp)", udp_do_one);
551 #if ENABLE_FEATURE_IPV6
552 if (inet6 && flags & NETSTAT_UDP)
553 do_info(_PATH_PROCNET_UDP6, "AF INET6 (udp)", udp_do_one);
555 if (inet && flags & NETSTAT_RAW)
556 do_info(_PATH_PROCNET_RAW, "AF INET (raw)", raw_do_one);
557 #if ENABLE_FEATURE_IPV6
558 if (inet6 && flags & NETSTAT_RAW)
559 do_info(_PATH_PROCNET_RAW6, "AF INET6 (raw)", raw_do_one);
561 if (flags & NETSTAT_UNIX) {
562 printf("Active UNIX domain sockets ");
563 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
564 printf("(servers and established)");
565 else if (flags & NETSTAT_LISTENING)
566 printf("(only servers)");
568 printf("(w/o servers)");
569 printf("\nProto RefCnt Flags Type State I-Node Path\n");
570 do_info(_PATH_PROCNET_UNIX, "AF UNIX", unix_do_one);