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 num)
125 /* hummm, we return static buffer here!! */
126 const char *str = itoa(ntohs(port));
128 struct servent *se = getservbyport(port, proto);
138 static void snprint_ip_port(char *ip_port, int size, struct sockaddr *addr, int port, const char *proto, int numeric)
140 const char *port_name;
144 // TODO: replace by xmalloc_sockaddr2host?
145 #if ENABLE_FEATURE_IPV6
146 if (addr->sa_family == AF_INET6) {
147 INET6_rresolve(ip_port, size, (struct sockaddr_in6 *)addr,
148 (numeric & NETSTAT_NUMERIC) ? 0x0fff : 0);
152 INET_rresolve(ip_port, size, (struct sockaddr_in *)addr,
153 0x4000 | ((numeric & NETSTAT_NUMERIC) ? 0x0fff : 0),
156 port_name = get_sname(htons(port), proto, numeric);
158 max_len = (option_mask32 & OPT_widedisplay)
159 ? (PRINT_IP_MAX_SIZE_WIDE - 1)
160 : (PRINT_IP_MAX_SIZE - 1);
161 port_name_len = strlen(port_name);
162 if ((strlen(ip_port) + port_name_len) > max_len)
163 ip_port[max_len - port_name_len] = '\0';
164 ip_port += strlen(ip_port);
166 strcpy(ip_port, port_name);
169 static void tcp_do_one(int lnr, const char *line)
171 char local_addr[64], rem_addr[64];
173 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
174 #if ENABLE_FEATURE_IPV6
175 struct sockaddr_in6 localaddr, remaddr;
177 struct sockaddr_in localaddr, remaddr;
179 unsigned long rxq, txq, time_len, retr, inode;
186 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
187 &d, local_addr, &local_port,
188 rem_addr, &rem_port, &state,
189 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
191 if (strlen(local_addr) > 8) {
192 #if ENABLE_FEATURE_IPV6
193 build_ipv6_addr(local_addr, &localaddr);
194 build_ipv6_addr(rem_addr, &remaddr);
197 build_ipv4_addr(local_addr, &localaddr);
198 build_ipv4_addr(rem_addr, &remaddr);
202 bb_error_msg("warning, got bogus tcp line");
206 if ((rem_port && (flags & NETSTAT_CONNECTED))
207 || (!rem_port && (flags & NETSTAT_LISTENING))
209 snprint_ip_port(local_addr, sizeof(local_addr),
210 (struct sockaddr *) &localaddr, local_port,
211 "tcp", flags & NETSTAT_NUMERIC);
212 snprint_ip_port(rem_addr, sizeof(rem_addr),
213 (struct sockaddr *) &remaddr, rem_port,
214 "tcp", flags & NETSTAT_NUMERIC);
215 printf(net_conn_line,
216 "tcp", rxq, txq, local_addr, rem_addr, tcp_state[state]);
220 static void udp_do_one(int lnr, const char *line)
222 char local_addr[64], rem_addr[64];
223 const char *state_str;
225 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
226 #if ENABLE_FEATURE_IPV6
227 struct sockaddr_in6 localaddr, remaddr;
229 struct sockaddr_in localaddr, remaddr;
231 unsigned long rxq, txq, time_len, retr, inode;
238 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
239 &d, local_addr, &local_port,
240 rem_addr, &rem_port, &state,
241 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
243 if (strlen(local_addr) > 8) {
244 #if ENABLE_FEATURE_IPV6
245 /* Demangle what the kernel gives us */
246 build_ipv6_addr(local_addr, &localaddr);
247 build_ipv6_addr(rem_addr, &remaddr);
250 build_ipv4_addr(local_addr, &localaddr);
251 build_ipv4_addr(rem_addr, &remaddr);
255 bb_error_msg("warning, got bogus udp line");
259 case TCP_ESTABLISHED:
260 state_str = "ESTABLISHED";
266 state_str = "UNKNOWN";
270 #if ENABLE_FEATURE_IPV6
271 # define notnull(A) ( \
272 ( (A.sin6_family == AF_INET6) \
273 && (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \
274 A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3]) \
276 (A.sin6_family == AF_INET) \
277 && ((struct sockaddr_in*)&A)->sin_addr.s_addr \
281 # define notnull(A) (A.sin_addr.s_addr)
284 int have_remaddr = notnull(remaddr);
285 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
286 || (!have_remaddr && (flags & NETSTAT_LISTENING))
288 snprint_ip_port(local_addr, sizeof(local_addr),
289 (struct sockaddr *) &localaddr, local_port,
290 "udp", flags & NETSTAT_NUMERIC);
291 snprint_ip_port(rem_addr, sizeof(rem_addr),
292 (struct sockaddr *) &remaddr, rem_port,
293 "udp", flags & NETSTAT_NUMERIC);
294 printf(net_conn_line,
295 "udp", rxq, txq, local_addr, rem_addr, state_str);
300 static void raw_do_one(int lnr, const char *line)
302 char local_addr[64], rem_addr[64];
304 int num, local_port, rem_port, d, state, timer_run, uid, timeout;
305 #if ENABLE_FEATURE_IPV6
306 struct sockaddr_in6 localaddr, remaddr;
308 struct sockaddr_in localaddr, remaddr;
310 unsigned long rxq, txq, time_len, retr, inode;
317 "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
318 &d, local_addr, &local_port,
319 rem_addr, &rem_port, &state,
320 &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
322 if (strlen(local_addr) > 8) {
323 #if ENABLE_FEATURE_IPV6
324 build_ipv6_addr(local_addr, &localaddr);
325 build_ipv6_addr(rem_addr, &remaddr);
328 build_ipv4_addr(local_addr, &localaddr);
329 build_ipv4_addr(rem_addr, &remaddr);
333 bb_error_msg("warning, got bogus raw line");
338 int have_remaddr = notnull(remaddr);
339 if ((have_remaddr && (flags & NETSTAT_CONNECTED))
340 || (!have_remaddr && (flags & NETSTAT_LISTENING))
342 snprint_ip_port(local_addr, sizeof(local_addr),
343 (struct sockaddr *) &localaddr, local_port,
344 "raw", flags & NETSTAT_NUMERIC);
345 snprint_ip_port(rem_addr, sizeof(rem_addr),
346 (struct sockaddr *) &remaddr, rem_port,
347 "raw", flags & NETSTAT_NUMERIC);
348 printf(net_conn_line,
349 "raw", rxq, txq, local_addr, rem_addr, itoa(state));
354 static void unix_do_one(int nr, const char *line)
356 static smallint has_inode = 0;
358 char path[PATH_MAX], ss_flags[32];
359 const char *ss_proto, *ss_state, *ss_type;
360 int num, state, type, inode;
362 unsigned long refcnt, proto, unix_flags;
365 if (strstr(line, "Inode"))
370 num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s",
371 &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path);
373 bb_error_msg("warning, got bogus unix line");
377 sprintf(path, "%d", inode);
379 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
380 if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
381 if (!(flags & NETSTAT_LISTENING))
384 if (!(flags & NETSTAT_CONNECTED))
411 ss_type = "SEQPACKET";
423 * Unconnected sockets may be listening
426 if (unix_flags & SO_ACCEPTCON) {
427 ss_state = "LISTENING";
433 ss_state = "CONNECTING";
436 ss_state = "CONNECTED";
438 case SS_DISCONNECTING:
439 ss_state = "DISCONNECTING";
442 ss_state = "UNKNOWN";
445 strcpy(ss_flags, "[ ");
446 if (unix_flags & SO_ACCEPTCON)
447 strcat(ss_flags, "ACC ");
448 if (unix_flags & SO_WAITDATA)
449 strcat(ss_flags, "W ");
450 if (unix_flags & SO_NOSPACE)
451 strcat(ss_flags, "N ");
452 strcat(ss_flags, "]");
454 printf("%-5s %-6ld %-11s %-10s %-13s ",
455 ss_proto, refcnt, ss_flags, ss_type, ss_state);
457 printf("%-6d ", inode);
463 #define _PATH_PROCNET_UDP "/proc/net/udp"
464 #define _PATH_PROCNET_UDP6 "/proc/net/udp6"
465 #define _PATH_PROCNET_TCP "/proc/net/tcp"
466 #define _PATH_PROCNET_TCP6 "/proc/net/tcp6"
467 #define _PATH_PROCNET_RAW "/proc/net/raw"
468 #define _PATH_PROCNET_RAW6 "/proc/net/raw6"
469 #define _PATH_PROCNET_UNIX "/proc/net/unix"
471 static void do_info(const char *file, const char *name, void (*proc)(int, const char *))
476 procinfo = fopen(file, "r");
477 if (procinfo == NULL) {
478 if (errno != ENOENT) {
479 bb_perror_msg("%s", file);
481 bb_error_msg("no support for '%s' on this system", name);
486 char *buffer = xmalloc_fgets(procinfo);
488 (proc)(lnr++, buffer);
491 } while (!feof(procinfo));
499 int netstat_main(int argc, char **argv);
500 int netstat_main(int argc, char **argv)
503 #if ENABLE_FEATURE_IPV6
507 enum { inet = 1, inet6 = 0 };
510 /* Option string must match NETSTAT_xxx constants */
511 opt = getopt32(argc, argv, NETSTAT_OPTS);
512 if (opt & 0x1) { // -l
513 flags &= ~NETSTAT_CONNECTED;
514 flags |= NETSTAT_LISTENING;
516 if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
517 //if (opt & 0x4) // -e
518 if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n
519 //if (opt & 0x10) // -t: NETSTAT_TCP
520 //if (opt & 0x20) // -u: NETSTAT_UDP
521 //if (opt & 0x40) // -w: NETSTAT_RAW
522 //if (opt & 0x80) // -x: NETSTAT_UNIX
523 if (opt & OPT_showroute) { // -r
525 bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
532 if (opt & OPT_widedisplay) { // -W
533 net_conn_line = PRINT_NET_CONN_WIDE;
536 opt &= NETSTAT_ALLPROTO;
538 flags &= ~NETSTAT_ALLPROTO;
541 if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
542 printf("Active Internet connections "); /* xxx */
544 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
545 printf("(servers and established)");
546 else if (flags & NETSTAT_LISTENING)
547 printf("(only servers)");
549 printf("(w/o servers)");
550 printf((opt & OPT_widedisplay) ? PRINT_NET_CONN_HEADER_WIDE : PRINT_NET_CONN_HEADER,
551 "Local Address", "Foreign Address");
553 if (inet && flags & NETSTAT_TCP)
554 do_info(_PATH_PROCNET_TCP, "AF INET (tcp)", tcp_do_one);
555 #if ENABLE_FEATURE_IPV6
556 if (inet6 && flags & NETSTAT_TCP)
557 do_info(_PATH_PROCNET_TCP6, "AF INET6 (tcp)", tcp_do_one);
559 if (inet && flags & NETSTAT_UDP)
560 do_info(_PATH_PROCNET_UDP, "AF INET (udp)", udp_do_one);
561 #if ENABLE_FEATURE_IPV6
562 if (inet6 && flags & NETSTAT_UDP)
563 do_info(_PATH_PROCNET_UDP6, "AF INET6 (udp)", udp_do_one);
565 if (inet && flags & NETSTAT_RAW)
566 do_info(_PATH_PROCNET_RAW, "AF INET (raw)", raw_do_one);
567 #if ENABLE_FEATURE_IPV6
568 if (inet6 && flags & NETSTAT_RAW)
569 do_info(_PATH_PROCNET_RAW6, "AF INET6 (raw)", raw_do_one);
571 if (flags & NETSTAT_UNIX) {
572 printf("Active UNIX domain sockets ");
573 if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
574 printf("(servers and established)");
575 else if (flags & NETSTAT_LISTENING)
576 printf("(only servers)");
578 printf("(w/o servers)");
579 printf("\nProto RefCnt Flags Type State I-Node Path\n");
580 do_info(_PATH_PROCNET_UNIX, "AF UNIX", unix_do_one);