netstat.c

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/* vi: set sw=4 ts=4: */
/*
 * Mini netstat implementation(s) for busybox
 * based in part on the netstat implementation from net-tools.
 *
 * Copyright (C) 2002 by Bart Visscher <[e-mail]>
 *
 * 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
 *
 * 2002-04-20
 * IPV6 support added by Bart Visscher <[e-mail]>
 */

#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 "inet_common.h"
#include "busybox.h"
#include "pwd_.h"

#ifdef CONFIG_ROUTE
extern void displayroutes(int noresolve, int netstatfmt);
#endif

#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

static 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 * const 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            */

static 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;
}

static 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;
}

static void snprint_ip_port(char *ip_port, int size, struct sockaddr *addr, int port, char *proto, int numeric)
{
	char *port_name;

#if CONFIG_FEATURE_IPV6
	if (addr->sa_family == AF_INET6) {
		INET6_rresolve(ip_port, size, (struct sockaddr_in6 *)addr,
					   (numeric&NETSTAT_NUMERIC) ? 0x0fff : 0);
	} else
#endif
	{
	INET_rresolve(ip_port, size, (struct sockaddr_in *)addr,
		0x4000 | ((numeric&NETSTAT_NUMERIC) ? 0x0fff : 0),
		0xffffffff);
	}
	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];
	const char *state_str;
	char more[512];
	int num, local_port, rem_port, d, state, timer_run, uid, timeout;
#if CONFIG_FEATURE_IPV6
	struct sockaddr_in6 localaddr, remaddr;
	char addr6[INET6_ADDRSTRLEN];
	struct in6_addr in6;
#else
	struct sockaddr_in localaddr, remaddr;
#endif
	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) {
#if CONFIG_FEATURE_IPV6
		sscanf(local_addr, "%08X%08X%08X%08X",
			   &in6.s6_addr32[0], &in6.s6_addr32[1],
			   &in6.s6_addr32[2], &in6.s6_addr32[3]);
		inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
		inet_pton(AF_INET6, addr6, (struct sockaddr *) &localaddr.sin6_addr);
		sscanf(rem_addr, "%08X%08X%08X%08X",
			   &in6.s6_addr32[0], &in6.s6_addr32[1],
			   &in6.s6_addr32[2], &in6.s6_addr32[3]);
		inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
		inet_pton(AF_INET6, addr6, (struct sockaddr *) &remaddr.sin6_addr);
		localaddr.sin6_family = AF_INET6;
		remaddr.sin6_family = AF_INET6;
#endif
	} 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.");
		return;
	}
	state_str = 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;
#if CONFIG_FEATURE_IPV6
	struct sockaddr_in6 localaddr, remaddr;
	char addr6[INET6_ADDRSTRLEN];
	struct in6_addr in6;
#else
	struct sockaddr_in localaddr, remaddr;
#endif
	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) {
#if CONFIG_FEATURE_IPV6
        /* Demangle what the kernel gives us */
		sscanf(local_addr, "%08X%08X%08X%08X",
			   &in6.s6_addr32[0], &in6.s6_addr32[1],
			   &in6.s6_addr32[2], &in6.s6_addr32[3]);
		inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
		inet_pton(AF_INET6, addr6, (struct sockaddr *) &localaddr.sin6_addr);
		sscanf(rem_addr, "%08X%08X%08X%08X",
			   &in6.s6_addr32[0], &in6.s6_addr32[1],
			   &in6.s6_addr32[2], &in6.s6_addr32[3]);
		inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
		inet_pton(AF_INET6, addr6, (struct sockaddr *) &remaddr.sin6_addr);
		localaddr.sin6_family = AF_INET6;
		remaddr.sin6_family = AF_INET6;
#endif
	} 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.");
		return;
	}
	switch (state) {
		case TCP_ESTABLISHED:
			state_str = "ESTABLISHED";
			break;

		case TCP_CLOSE:
			state_str = "";
			break;

		default:
			state_str = "UNKNOWN";
			break;
	}

#if CONFIG_FEATURE_IPV6
#define notnull(A) (((A.sin6_family == AF_INET6) &&            \
					 ((A.sin6_addr.s6_addr32[0]) ||            \
					  (A.sin6_addr.s6_addr32[1]) ||            \
					  (A.sin6_addr.s6_addr32[2]) ||            \
					  (A.sin6_addr.s6_addr32[3]))) ||          \
					((A.sin6_family == AF_INET) &&             \
					 ((struct sockaddr_in *) &A)->sin_addr.s_addr))
#else
#define notnull(A) (A.sin_addr.s_addr)
#endif
	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;
#if CONFIG_FEATURE_IPV6
	struct sockaddr_in6 localaddr, remaddr;
	char addr6[INET6_ADDRSTRLEN];
	struct in6_addr in6;
#else
	struct sockaddr_in localaddr, remaddr;
#endif
	unsigned long rxq, txq, time_len, retr, inode;