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busybox/networking/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 <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
*
* 2002-04-20
* IPV6 support added by Bart Visscher <magick@linux-fan.com>
*/
#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;
#ifdef 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;
#ifdef 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) {
#ifdef 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) {
bb_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;
#ifdef 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) {
#ifdef 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) {
bb_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;
}
#ifdef 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;
#ifdef 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) {
#ifdef 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) {
bb_error_msg("warning, got bogus raw line.");
return;
}
state_str=itoa(state);
#ifdef 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,
"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) {
bb_error_msg("warning, got bogus unix line.");
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_UDP6 "/proc/net/udp6"
#define _PATH_PROCNET_TCP "/proc/net/tcp"
#define _PATH_PROCNET_TCP6 "/proc/net/tcp6"
#define _PATH_PROCNET_RAW "/proc/net/raw"
#define _PATH_PROCNET_RAW6 "/proc/net/raw6"
#define _PATH_PROCNET_UNIX "/proc/net/unix"
static void do_info(const char *file, const char *name, void (*proc)(int, const char *))
{
char buffer[8192];
int lnr = 0;
FILE *procinfo;
procinfo = fopen(file, "r");
if (procinfo == NULL) {
if (errno != ENOENT) {
perror(file);
} else {
bb_error_msg("no support for `%s' on this system.", name);
}
} else {
do {
if (fgets(buffer, sizeof(buffer), procinfo))
(proc)(lnr++, buffer);
} while (!feof(procinfo));
fclose(procinfo);
}
}
/*
* Our main function.
*/
int netstat_main(int argc, char **argv)
{
int opt;
int new_flags=0;
int showroute = 0, extended = 0;
#ifdef CONFIG_FEATURE_IPV6
int inet=1;
int inet6=1;
#else
# define inet 1
# define inet6 0
#endif
while ((opt = getopt(argc, argv, "laenrtuwx")) != -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 'r':
showroute = 1;
break;
case 'e':
extended = 1;
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:
bb_show_usage();
}
if ( showroute ) {
#ifdef CONFIG_ROUTE
displayroutes ( flags & NETSTAT_NUMERIC, !extended );
return 0;
#else
bb_error_msg_and_die( "-r (display routing table) is not compiled in." );
#endif
}
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 (inet && flags&NETSTAT_TCP)
do_info(_PATH_PROCNET_TCP,"AF INET (tcp)",tcp_do_one);
#ifdef CONFIG_FEATURE_IPV6
if (inet6 && flags&NETSTAT_TCP)
do_info(_PATH_PROCNET_TCP6,"AF INET6 (tcp)",tcp_do_one);
#endif
if (inet && flags&NETSTAT_UDP)
do_info(_PATH_PROCNET_UDP,"AF INET (udp)",udp_do_one);
#ifdef CONFIG_FEATURE_IPV6
if (inet6 && flags&NETSTAT_UDP)
do_info(_PATH_PROCNET_UDP6,"AF INET6 (udp)",udp_do_one);
#endif
if (inet && flags&NETSTAT_RAW)
do_info(_PATH_PROCNET_RAW,"AF INET (raw)",raw_do_one);
#ifdef CONFIG_FEATURE_IPV6
if (inet6 && flags&NETSTAT_RAW)
do_info(_PATH_PROCNET_RAW6,"AF INET6 (raw)",raw_do_one);
#endif
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;
}
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