Add netstat applet, submitted by Bart Visscher <magick@linux-fan.com>
diff --git a/networking/netstat.c b/networking/netstat.c
new file mode 100644
index 0000000..e33a89a
--- /dev/null
+++ b/networking/netstat.c
@@ -0,0 +1,547 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini netstat implementation(s) for busybox
+ * based in part on the netstat implementation from net-tools.
+ *
+ * Copyright (C) 2001 by Bart Visscher <magick@linux-fan.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "busybox.h"
+
+#define NETSTAT_CONNECTED 0x01
+#define NETSTAT_LISTENING 0x02
+#define NETSTAT_NUMERIC 0x04
+#define NETSTAT_TCP 0x10
+#define NETSTAT_UDP 0x20
+#define NETSTAT_RAW 0x40
+#define NETSTAT_UNIX 0x80
+
+int flags = NETSTAT_CONNECTED |
+ NETSTAT_TCP | NETSTAT_UDP | NETSTAT_RAW | NETSTAT_UNIX;
+
+#define PROGNAME_WIDTHs PROGNAME_WIDTH1(PROGNAME_WIDTH)
+#define PROGNAME_WIDTH1(s) PROGNAME_WIDTH2(s)
+#define PROGNAME_WIDTH2(s) #s
+
+#define PRG_HASH_SIZE 211
+
+enum {
+ TCP_ESTABLISHED = 1,
+ TCP_SYN_SENT,
+ TCP_SYN_RECV,
+ TCP_FIN_WAIT1,
+ TCP_FIN_WAIT2,
+ TCP_TIME_WAIT,
+ TCP_CLOSE,
+ TCP_CLOSE_WAIT,
+ TCP_LAST_ACK,
+ TCP_LISTEN,
+ TCP_CLOSING /* now a valid state */
+};
+
+static const char *tcp_state[] =
+{
+ "",
+ "ESTABLISHED",
+ "SYN_SENT",
+ "SYN_RECV",
+ "FIN_WAIT1",
+ "FIN_WAIT2",
+ "TIME_WAIT",
+ "CLOSE",
+ "CLOSE_WAIT",
+ "LAST_ACK",
+ "LISTEN",
+ "CLOSING"
+};
+
+typedef enum {
+ SS_FREE = 0, /* not allocated */
+ SS_UNCONNECTED, /* unconnected to any socket */
+ SS_CONNECTING, /* in process of connecting */
+ SS_CONNECTED, /* connected to socket */
+ SS_DISCONNECTING /* in process of disconnecting */
+} socket_state;
+
+#define SO_ACCEPTCON (1<<16) /* performed a listen */
+#define SO_WAITDATA (1<<17) /* wait data to read */
+#define SO_NOSPACE (1<<18) /* no space to write */
+
+char *itoa(unsigned int i)
+{
+ /* 21 digits plus null terminator, good for 64-bit or smaller ints */
+ static char local[22];
+ char *p = &local[21];
+ *p-- = '\0';
+ do {
+ *p-- = '0' + i % 10;
+ i /= 10;
+ } while (i > 0);
+ return p + 1;
+}
+
+char *inet_sprint(struct sockaddr* addr, int num)
+{
+ char *str;
+ str=inet_ntoa(((struct sockaddr_in*)addr)->sin_addr);
+ if (!strcmp(str,"0.0.0.0")) {
+ str="*";
+ }
+ if (num)
+ {
+ } else {
+ struct hostent *he=gethostbyaddr(&((struct sockaddr_in*)addr)->sin_addr,4,AF_INET);
+ if (he)
+ str=he->h_name;
+ }
+ return str;
+}
+
+char *get_sname(int port, const char *proto, int num)
+{
+ char *str=itoa(ntohs(port));
+ if (num) {
+ } else {
+ struct servent *se=getservbyport(port,proto);
+ if (se)
+ str=se->s_name;
+ }
+ if (!port) {
+ str="*";
+ }
+ return str;
+}
+
+void snprint_ip_port(char *ip_port, int size, struct sockaddr *addr, int port, char *proto, int numeric)
+{
+ char *port_name;
+ safe_strncpy(ip_port, inet_sprint(addr, numeric), size);
+ port_name=get_sname(htons(port), proto, numeric);
+ if ((strlen(ip_port) + strlen(port_name)) > 22)
+ ip_port[22 - strlen(port_name)] = '\0';
+ ip_port+=strlen(ip_port);
+ strcat(ip_port, ":");
+ strcat(ip_port, port_name);
+}
+
+static void tcp_do_one(int lnr, const char *line)
+{
+ char local_addr[64], rem_addr[64];
+ char *state_str, more[512];
+ int num, local_port, rem_port, d, state, timer_run, uid, timeout;
+ struct sockaddr_in localaddr, remaddr;
+ unsigned long rxq, txq, time_len, retr, inode;
+
+ if (lnr == 0)
+ return;
+
+ more[0] = '\0';
+ num = sscanf(line,
+ "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
+ &d, local_addr, &local_port,
+ rem_addr, &rem_port, &state,
+ &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
+
+ if (strlen(local_addr) > 8) {
+ } else {
+ sscanf(local_addr, "%X",
+ &((struct sockaddr_in *) &localaddr)->sin_addr.s_addr);
+ sscanf(rem_addr, "%X",
+ &((struct sockaddr_in *) &remaddr)->sin_addr.s_addr);
+ ((struct sockaddr *) &localaddr)->sa_family = AF_INET;
+ ((struct sockaddr *) &remaddr)->sa_family = AF_INET;
+ }
+
+ if (num < 10) {
+ error_msg("warning, got bogus tcp line.\n");
+ return;
+ }
+ state_str=(char*)tcp_state[state];
+ if ((rem_port && (flags&NETSTAT_CONNECTED)) ||
+ (!rem_port && (flags&NETSTAT_LISTENING)))
+ {
+ snprint_ip_port(local_addr, sizeof(local_addr),
+ (struct sockaddr *) &localaddr, local_port,
+ "tcp", flags&NETSTAT_NUMERIC);
+
+ snprint_ip_port(rem_addr, sizeof(rem_addr),
+ (struct sockaddr *) &remaddr, rem_port,
+ "tcp", flags&NETSTAT_NUMERIC);
+
+ printf("tcp %6ld %6ld %-23s %-23s %-12s\n",
+ rxq, txq, local_addr, rem_addr, state_str);
+
+ }
+}
+
+static void udp_do_one(int lnr, const char *line)
+{
+ char local_addr[64], rem_addr[64];
+ char *state_str, more[512];
+ int num, local_port, rem_port, d, state, timer_run, uid, timeout;
+ struct sockaddr_in localaddr, remaddr;
+ unsigned long rxq, txq, time_len, retr, inode;
+
+ if (lnr == 0)
+ return;
+
+ more[0] = '\0';
+ num = sscanf(line,
+ "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
+ &d, local_addr, &local_port,
+ rem_addr, &rem_port, &state,
+ &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
+
+ if (strlen(local_addr) > 8) {
+ } else {
+ sscanf(local_addr, "%X",
+ &((struct sockaddr_in *) &localaddr)->sin_addr.s_addr);
+ sscanf(rem_addr, "%X",
+ &((struct sockaddr_in *) &remaddr)->sin_addr.s_addr);
+ ((struct sockaddr *) &localaddr)->sa_family = AF_INET;
+ ((struct sockaddr *) &remaddr)->sa_family = AF_INET;
+ }
+
+ if (num < 10) {
+ error_msg("warning, got bogus udp line.\n");
+ return;
+ }
+ switch (state) {
+ case TCP_ESTABLISHED:
+ state_str = "ESTABLISHED";
+ break;
+
+ case TCP_CLOSE:
+ state_str = "";
+ break;
+
+ default:
+ state_str = "UNKNOWN";
+ break;
+ }
+
+#define notnull(A) (A.sin_addr.s_addr)
+ if ((notnull(remaddr) && (flags&NETSTAT_CONNECTED)) ||
+ (!notnull(remaddr) && (flags&NETSTAT_LISTENING)))
+ {
+ snprint_ip_port(local_addr, sizeof(local_addr),
+ (struct sockaddr *) &localaddr, local_port,
+ "udp", flags&NETSTAT_NUMERIC);
+
+ snprint_ip_port(rem_addr, sizeof(rem_addr),
+ (struct sockaddr *) &remaddr, rem_port,
+ "udp", flags&NETSTAT_NUMERIC);
+
+ printf("udp %6ld %6ld %-23s %-23s %-12s\n",
+ rxq, txq, local_addr, rem_addr, state_str);
+
+ }
+}
+
+static void raw_do_one(int lnr, const char *line)
+{
+ char local_addr[64], rem_addr[64];
+ char *state_str, more[512];
+ int num, local_port, rem_port, d, state, timer_run, uid, timeout;
+ struct sockaddr_in localaddr, remaddr;
+ unsigned long rxq, txq, time_len, retr, inode;
+
+ if (lnr == 0)
+ return;
+
+ more[0] = '\0';
+ num = sscanf(line,
+ "%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %ld %512s\n",
+ &d, local_addr, &local_port,
+ rem_addr, &rem_port, &state,
+ &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
+
+ if (strlen(local_addr) > 8) {
+ } else {
+ sscanf(local_addr, "%X",
+ &((struct sockaddr_in *) &localaddr)->sin_addr.s_addr);
+ sscanf(rem_addr, "%X",
+ &((struct sockaddr_in *) &remaddr)->sin_addr.s_addr);
+ ((struct sockaddr *) &localaddr)->sa_family = AF_INET;
+ ((struct sockaddr *) &remaddr)->sa_family = AF_INET;
+ }
+
+ if (num < 10) {
+ error_msg("warning, got bogus raw line.\n");
+ return;
+ }
+ state_str=itoa(state);
+
+#define notnull(A) (A.sin_addr.s_addr)
+ if ((notnull(remaddr) && (flags&NETSTAT_CONNECTED)) ||
+ (!notnull(remaddr) && (flags&NETSTAT_LISTENING)))
+ {
+ snprint_ip_port(local_addr, sizeof(local_addr),
+ (struct sockaddr *) &localaddr, local_port,
+ "raw", flags&NETSTAT_NUMERIC);
+
+ snprint_ip_port(rem_addr, sizeof(rem_addr),
+ (struct sockaddr *) &remaddr, rem_port,
+ "raw", flags&NETSTAT_NUMERIC);
+
+ printf("raw %6ld %6ld %-23s %-23s %-12s\n",
+ rxq, txq, local_addr, rem_addr, state_str);
+
+ }
+}
+
+#define HAS_INODE 1
+
+static void unix_do_one(int nr, const char *line)
+{
+ static int has = 0;
+ char path[PATH_MAX], ss_flags[32];
+ char *ss_proto, *ss_state, *ss_type;
+ int num, state, type, inode;
+ void *d;
+ unsigned long refcnt, proto, unix_flags;
+
+ if (nr == 0) {
+ if (strstr(line, "Inode"))
+ has |= HAS_INODE;
+ return;
+ }
+ path[0] = '\0';
+ num = sscanf(line, "%p: %lX %lX %lX %X %X %d %s",
+ &d, &refcnt, &proto, &unix_flags, &type, &state, &inode, path);
+ if (num < 6) {
+ error_msg("warning, got bogus unix line.\n");
+ return;
+ }
+ if (!(has & HAS_INODE))
+ snprintf(path,sizeof(path),"%d",inode);
+
+ if ((flags&(NETSTAT_LISTENING|NETSTAT_CONNECTED))!=(NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
+ if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
+ if (!(flags&NETSTAT_LISTENING))
+ return;
+ } else {
+ if (!(flags&NETSTAT_CONNECTED))
+ return;
+ }
+ }
+
+ switch (proto) {
+ case 0:
+ ss_proto = "unix";
+ break;
+
+ default:
+ ss_proto = "??";
+ }
+
+ switch (type) {
+ case SOCK_STREAM:
+ ss_type = "STREAM";
+ break;
+
+ case SOCK_DGRAM:
+ ss_type = "DGRAM";
+ break;
+
+ case SOCK_RAW:
+ ss_type = "RAW";
+ break;
+
+ case SOCK_RDM:
+ ss_type = "RDM";
+ break;
+
+ case SOCK_SEQPACKET:
+ ss_type = "SEQPACKET";
+ break;
+
+ default:
+ ss_type = "UNKNOWN";
+ }
+
+ switch (state) {
+ case SS_FREE:
+ ss_state = "FREE";
+ break;
+
+ case SS_UNCONNECTED:
+ /*
+ * Unconnected sockets may be listening
+ * for something.
+ */
+ if (unix_flags & SO_ACCEPTCON) {
+ ss_state = "LISTENING";
+ } else {
+ ss_state = "";
+ }
+ break;
+
+ case SS_CONNECTING:
+ ss_state = "CONNECTING";
+ break;
+
+ case SS_CONNECTED:
+ ss_state = "CONNECTED";
+ break;
+
+ case SS_DISCONNECTING:
+ ss_state = "DISCONNECTING";
+ break;
+
+ default:
+ ss_state = "UNKNOWN";
+ }
+
+ strcpy(ss_flags, "[ ");
+ if (unix_flags & SO_ACCEPTCON)
+ strcat(ss_flags, "ACC ");
+ if (unix_flags & SO_WAITDATA)
+ strcat(ss_flags, "W ");
+ if (unix_flags & SO_NOSPACE)
+ strcat(ss_flags, "N ");
+
+ strcat(ss_flags, "]");
+
+ printf("%-5s %-6ld %-11s %-10s %-13s ",
+ ss_proto, refcnt, ss_flags, ss_type, ss_state);
+ if (has & HAS_INODE)
+ printf("%-6d ",inode);
+ else
+ printf("- ");
+ puts(path);
+}
+
+#define _PATH_PROCNET_UDP "/proc/net/udp"
+#define _PATH_PROCNET_TCP "/proc/net/tcp"
+#define _PATH_PROCNET_RAW "/proc/net/raw"
+#define _PATH_PROCNET_UNIX "/proc/net/unix"
+
+static int do_info(char *file, char *name, void (*proc)(int, const char *))
+{
+ char buffer[8192];
+ int rc = 0;
+ int lnr = 0;
+ FILE *procinfo;
+
+ procinfo = fopen((file), "r");
+ if (procinfo == NULL) {
+ if (errno != ENOENT) {
+ perror((file));
+ return -1;
+ }
+ error_msg("%s: no support for `%s' on this system.\n",
+ "netstat", (name));
+ rc = 1;
+ } else {
+ do {
+ if (fgets(buffer, sizeof(buffer), procinfo))
+ (proc)(lnr++, buffer);
+ } while (!feof(procinfo));
+ fclose(procinfo);
+ }
+ return rc;
+}
+
+/*
+ * Our main function.
+ */
+
+int netstat_main(int argc, char **argv)
+{
+ int opt;
+ int new_flags=0;
+ while ((opt = getopt(argc, argv, "lantuwx")) != -1)
+ switch (opt) {
+ case 'l':
+ flags &= ~NETSTAT_CONNECTED;
+ flags |= NETSTAT_LISTENING;
+ break;
+ case 'a':
+ flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED;
+ break;
+ case 'n':
+ flags |= NETSTAT_NUMERIC;
+ break;
+ case 't':
+ new_flags |= NETSTAT_TCP;
+ break;
+ case 'u':
+ new_flags |= NETSTAT_UDP;
+ break;
+ case 'w':
+ new_flags |= NETSTAT_RAW;
+ break;
+ case 'x':
+ new_flags |= NETSTAT_UNIX;
+ break;
+ default:
+ show_usage();
+ }
+ if (new_flags) {
+ flags &= ~(NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX);
+ flags |= new_flags;
+ }
+ if (flags&(NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
+ printf("Active Internet connections "); /* xxx */
+
+ if ((flags&(NETSTAT_LISTENING|NETSTAT_CONNECTED))==(NETSTAT_LISTENING|NETSTAT_CONNECTED))
+ printf("(servers and established)");
+ else {
+ if (flags&NETSTAT_LISTENING)
+ printf("(only servers)");
+ else
+ printf("(w/o servers)");
+ }
+ printf("\nProto Recv-Q Send-Q Local Address Foreign Address State \n");
+ }
+ if (flags&NETSTAT_TCP)
+ do_info(_PATH_PROCNET_TCP,"AF INET (tcp)",tcp_do_one);
+ if (flags&NETSTAT_UDP)
+ do_info(_PATH_PROCNET_UDP,"AF INET (udp)",udp_do_one);
+ if (flags&NETSTAT_RAW)
+ do_info(_PATH_PROCNET_RAW,"AF INET (raw)",raw_do_one);
+ if (flags&NETSTAT_UNIX) {
+ printf("Active UNIX domain sockets ");
+ if ((flags&(NETSTAT_LISTENING|NETSTAT_CONNECTED))==(NETSTAT_LISTENING|NETSTAT_CONNECTED))
+ printf("(servers and established)");
+ else {
+ if (flags&NETSTAT_LISTENING)
+ printf("(only servers)");
+ else
+ printf("(w/o servers)");
+ }
+
+ printf("\nProto RefCnt Flags Type State I-Node Path\n");
+ do_info(_PATH_PROCNET_UNIX,"AF UNIX",unix_do_one);
+ }
+ return 0;
+}