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cd8c436d81
hush/networking/netstat.c
Eric Andersen cd8c436d81 Latest patch from vodz: 
-- reverse resolve network name and cache in route and ifconfig
	applets, fix print nslookup server name if compile without
	uClibc, fix route crashe 'route add', fix warnings compile
	networking and pwd_grp applets
2001-11-10 11:22:46 +00:00

531 lines
13 KiB
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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) 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 "inet_common.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 */
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;
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];
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;
}
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