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[] =
67 SS_FREE = 0, /* not allocated */
68 SS_UNCONNECTED, /* unconnected to any socket */
69 SS_CONNECTING, /* in process of connecting */
70 SS_CONNECTED, /* connected to socket */
71 SS_DISCONNECTING /* in process of disconnecting */
74 #define SO_ACCEPTCON (1<<16) /* performed a listen */
75 #define SO_WAITDATA (1<<17) /* wait data to read */
76 #define SO_NOSPACE (1<<18) /* no space to write */
78 /* Standard printout size */
79 #define PRINT_IP_MAX_SIZE 23
80 #define PRINT_NET_CONN "%s %6ld %6ld %-23s %-23s %-12s\n"
81 #define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State\n"
83 /* When there are IPv6 connections the IPv6 addresses will be
84 * truncated to none-recognition. The '-W' option makes the
85 * address columns wide enough to accomodate for longest possible
86 * IPv6 addresses, i.e. addresses of the form
87 * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
89 #define PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
90 #define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s\n"
91 #define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State\n"
93 static const char *net_conn_line = PRINT_NET_CONN;
96 #if ENABLE_FEATURE_IPV6
97 static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
99 char addr6[INET6_ADDRSTRLEN];
102 sscanf(local_addr, "%08X%08X%08X%08X",
103 &in6.s6_addr32[0], &in6.s6_addr32[1],
104 &in6.s6_addr32[2], &in6.s6_addr32[3]);
105 inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
106 inet_pton(AF_INET6, addr6, (struct sockaddr *) &localaddr->sin6_addr);
108 localaddr->sin6_family = AF_INET6;
112 #if ENABLE_FEATURE_IPV6
113 static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr)
115 static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
118 sscanf(local_addr, "%X",
119 &((struct sockaddr_in *) localaddr)->sin_addr.s_addr);
120 ((struct sockaddr *) localaddr)->sa_family = AF_INET;
123 static const char *get_sname(int port, const char *proto, int numeric)
128 struct servent *se = getservbyport(port, proto);
132 /* hummm, we may return static buffer here!! */
133 return itoa(ntohs(port));
136 static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
138 enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) };
139 char *host, *host_port;
141 /* Code which used "*" for INADDR_ANY is removed: it's ambiguous in IPv6,
142 * while "0.0.0.0" is not. */
144 host = numeric ? xmalloc_sockaddr2dotted_noport(addr, salen)
145 : xmalloc_sockaddr2host_noport(addr, salen);
147 host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
152 static void tcp_do_one(int lnr, const char *line)
154 char local_addr[64], rem_addr[64];
156 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
157 #if ENABLE_FEATURE_IPV6
158 struct sockaddr_in6 localaddr, remaddr;
160 struct sockaddr_in localaddr, remaddr;
162 unsigned long rxq, txq, time_len, retr, inode;
169 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
170 &d, local_addr, &local_port,
171 rem_addr, &rem_port, &state,
172 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
174 if (strlen(local_addr) > 8) {
175 #if ENABLE_FEATURE_IPV6
176 build_ipv6_addr(local_addr, &localaddr);
177 build_ipv6_addr(rem_addr, &remaddr);
180 build_ipv4_addr(local_addr, &localaddr);
181 build_ipv4_addr(rem_addr, &remaddr);
185 bb_error_msg("warning, got bogus tcp line");
189 if ((rem_port && (flags & NETSTAT_CONNECTED))
190 || (!rem_port && (flags & NETSTAT_LISTENING))
192 char *l = ip_port_str(
193 (struct sockaddr *) &localaddr, local_port,
194 "tcp", flags & NETSTAT_NUMERIC);
195 char *r = ip_port_str(
196 (struct sockaddr *) &remaddr, rem_port,
197 "tcp", flags & NETSTAT_NUMERIC);
198 printf(net_conn_line,
199 "tcp", rxq, txq, l, r, tcp_state[state]);
205 static void udp_do_one(int lnr, const char *line)
207 char local_addr[64], rem_addr[64];
208 const char *state_str;
210 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
211 #if ENABLE_FEATURE_IPV6
212 struct sockaddr_in6 localaddr, remaddr;
214 struct sockaddr_in localaddr, remaddr;
216 unsigned long rxq, txq, time_len, retr, inode;
223 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
224 &d, local_addr, &local_port,
225 rem_addr, &rem_port, &state,
226 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
228 if (strlen(local_addr) > 8) {
229 #if ENABLE_FEATURE_IPV6
230 /* Demangle what the kernel gives us */
231 build_ipv6_addr(local_addr, &localaddr);
232 build_ipv6_addr(rem_addr, &remaddr);
235 build_ipv4_addr(local_addr, &localaddr);
236 build_ipv4_addr(rem_addr, &remaddr);
240 bb_error_msg("warning, got bogus udp line");
244 case TCP_ESTABLISHED:
245 state_str = "ESTABLISHED";
251 state_str = "UNKNOWN";
255 #if ENABLE_FEATURE_IPV6
256 # define notnull(A) ( \
257 ( (A.sin6_family == AF_INET6) \
258 && (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \
259 A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3]) \
261 (A.sin6_family == AF_INET) \
262 && ((struct sockaddr_in*)&A)->sin_addr.s_addr \
266 # define notnull(A) (A.sin_addr.s_addr)
269 int have_remaddr = notnull(remaddr);
270 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
271 || (!have_remaddr && (flags & NETSTAT_LISTENING))
273 char *l = ip_port_str(
274 (struct sockaddr *) &localaddr, local_port,
275 "udp", flags & NETSTAT_NUMERIC);
276 char *r = ip_port_str(
277 (struct sockaddr *) &remaddr, rem_port,
278 "udp", flags & NETSTAT_NUMERIC);
279 printf(net_conn_line,
280 "udp", rxq, txq, l, r, state_str);
287 static void raw_do_one(int lnr, const char *line)
289 char local_addr[64], rem_addr[64];
291 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
292 #if ENABLE_FEATURE_IPV6
293 struct sockaddr_in6 localaddr, remaddr;
295 struct sockaddr_in localaddr, remaddr;
297 unsigned long rxq, txq, time_len, retr, inode;
304 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
305 &d, local_addr, &local_port,
306 rem_addr, &rem_port, &state,
307 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
309 if (strlen(local_addr) > 8) {
310 #if ENABLE_FEATURE_IPV6
311 build_ipv6_addr(local_addr, &localaddr);
312 build_ipv6_addr(rem_addr, &remaddr);
315 build_ipv4_addr(local_addr, &localaddr);
316 build_ipv4_addr(rem_addr, &remaddr);
320 bb_error_msg("warning, got bogus raw line");
325 int have_remaddr = notnull(remaddr);
326 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
327 || (!have_remaddr && (flags & NETSTAT_LISTENING))
329 char *l = ip_port_str(
330 (struct sockaddr *) &localaddr, local_port,
331 "raw", flags & NETSTAT_NUMERIC);
332 char *r = ip_port_str(
333 (struct sockaddr *) &remaddr, rem_port,
334 "raw", flags & NETSTAT_NUMERIC);
335 printf(net_conn_line,
336 "raw", rxq, txq, l, r, itoa(state));
343 static void unix_do_one(int nr, const char *line)
345 static smallint has_inode = 0;
347 char path[PATH_MAX], ss_flags[32];
348 const char *ss_proto, *ss_state, *ss_type;
349 int num, state, type, inode;
351 unsigned long refcnt, proto, unix_flags;
354 if (strstr(line, "Inode"))
359 num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s",
360 &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path);
362 bb_error_msg("warning, got bogus unix line");
366 sprintf(path, "%d", inode);
368 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
369 if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
370 if (!(flags & NETSTAT_LISTENING))
373 if (!(flags & NETSTAT_CONNECTED))
400 ss_type = "SEQPACKET";
412 * Unconnected sockets may be listening
415 if (unix_flags & SO_ACCEPTCON) {
416 ss_state = "LISTENING";
422 ss_state = "CONNECTING";
425 ss_state = "CONNECTED";
427 case SS_DISCONNECTING:
428 ss_state = "DISCONNECTING";
431 ss_state = "UNKNOWN";
434 strcpy(ss_flags, "[ ");
435 if (unix_flags & SO_ACCEPTCON)
436 strcat(ss_flags, "ACC ");
437 if (unix_flags & SO_WAITDATA)
438 strcat(ss_flags, "W ");
439 if (unix_flags & SO_NOSPACE)
440 strcat(ss_flags, "N ");
441 strcat(ss_flags, "]");
443 printf("%-5s %-6ld %-11s %-10s %-13s ",
444 ss_proto, refcnt, ss_flags, ss_type, ss_state);
446 printf("%-6d ", inode);
452 #define _PATH_PROCNET_UDP "/proc/net/udp"
453 #define _PATH_PROCNET_UDP6 "/proc/net/udp6"
454 #define _PATH_PROCNET_TCP "/proc/net/tcp"
455 #define _PATH_PROCNET_TCP6 "/proc/net/tcp6"
456 #define _PATH_PROCNET_RAW "/proc/net/raw"
457 #define _PATH_PROCNET_RAW6 "/proc/net/raw6"
458 #define _PATH_PROCNET_UNIX "/proc/net/unix"
460 static void do_info(const char *file, const char *name, void (*proc)(int, const char *))
465 procinfo = fopen(file, "r");
466 if (procinfo == NULL) {
467 if (errno != ENOENT) {
468 bb_perror_msg("%s", file);
470 bb_error_msg("no support for '%s' on this system", name);
475 char *buffer = xmalloc_fgets(procinfo);
477 (proc)(lnr++, buffer);
480 } while (!feof(procinfo));
488 int netstat_main(int argc, char **argv);
489 int netstat_main(int argc, 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(argc, 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);