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>
*
* 2002-04-20
* IPV6 support added by Bart Visscher <magick@linux-fan.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include "inet_common.h"
enum {
OPT_extended = 0x4,
OPT_showroute = 0x100,
OPT_widedisplay = 0x200 * ENABLE_FEATURE_NETSTAT_WIDE,
};
# define NETSTAT_OPTS "laentuwxr"USE_FEATURE_NETSTAT_WIDE("W")
#define NETSTAT_CONNECTED 0x01
#define NETSTAT_LISTENING 0x02
#define NETSTAT_NUMERIC 0x04
/* Must match getopt32 option string */
#define NETSTAT_TCP 0x10
#define NETSTAT_UDP 0x20
#define NETSTAT_RAW 0x40
#define NETSTAT_UNIX 0x80
#define NETSTAT_ALLPROTO (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX)
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static smallint flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO;
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 */
/* Standard printout size */
#define PRINT_IP_MAX_SIZE 23
#define PRINT_NET_CONN "%s %6ld %6ld %-23s %-23s %-12s\n"
#define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State\n"
/* When there are IPv6 connections the IPv6 addresses will be
* truncated to none-recognition. The '-W' option makes the
* address columns wide enough to accomodate for longest possible
* IPv6 addresses, i.e. addresses of the form
* xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
*/
#define PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
#define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s\n"
#define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State\n"
static const char *net_conn_line = PRINT_NET_CONN;
#if ENABLE_FEATURE_IPV6
static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
{
char addr6[INET6_ADDRSTRLEN];
struct in6_addr in6;
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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);
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localaddr->sin6_family = AF_INET6;
}
#endif
#if ENABLE_FEATURE_IPV6
static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr)
#else
static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
#endif
{
sscanf(local_addr, "%X",
&((struct sockaddr_in *) localaddr)->sin_addr.s_addr);
((struct sockaddr *) localaddr)->sa_family = AF_INET;
}
static const char *get_sname(int port, const char *proto, int numeric)
{
if (!port)
return "*";
if (!numeric) {
struct servent *se = getservbyport(port, proto);
if (se)
return se->s_name;
}
/* hummm, we may return static buffer here!! */
return itoa(ntohs(port));
}
static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
{
enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) };
char *host, *host_port;
/* Code which used "*" for INADDR_ANY is removed: it's ambiguous in IPv6,
* while "0.0.0.0" is not. */
host = numeric ? xmalloc_sockaddr2dotted_noport(addr)
: xmalloc_sockaddr2host_noport(addr);
host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
free(host);
return host_port;
}
static int tcp_do_one(int lnr, char *line)
{
char local_addr[64], rem_addr[64];
char more[512];
int num, local_port, rem_port, d, state, timer_run, uid, timeout;
#if ENABLE_FEATURE_IPV6
struct sockaddr_in6 localaddr, remaddr;
#else
struct sockaddr_in localaddr, remaddr;
#endif
unsigned long rxq, txq, time_len, retr, inode;
if (lnr == 0)
return 0;
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 (num < 10) {
return 1; /* error */
}
if (strlen(local_addr) > 8) {
#if ENABLE_FEATURE_IPV6
build_ipv6_addr(local_addr, &localaddr);
build_ipv6_addr(rem_addr, &remaddr);
#endif
} else {
build_ipv4_addr(local_addr, &localaddr);
build_ipv4_addr(rem_addr, &remaddr);
}
if ((rem_port && (flags & NETSTAT_CONNECTED))
|| (!rem_port && (flags & NETSTAT_LISTENING))
) {
char *l = ip_port_str(
(struct sockaddr *) &localaddr, local_port,
"tcp", flags & NETSTAT_NUMERIC);
char *r = ip_port_str(
(struct sockaddr *) &remaddr, rem_port,
"tcp", flags & NETSTAT_NUMERIC);
printf(net_conn_line,
"tcp", rxq, txq, l, r, tcp_state[state]);
free(l);
free(r);
}
return 0;
}
static int udp_do_one(int lnr, 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 ENABLE_FEATURE_IPV6
struct sockaddr_in6 localaddr, remaddr;
#else
struct sockaddr_in localaddr, remaddr;
#endif
unsigned long rxq, txq, time_len, retr, inode;
if (lnr == 0)
return 0;
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 ENABLE_FEATURE_IPV6
/* Demangle what the kernel gives us */
build_ipv6_addr(local_addr, &localaddr);
build_ipv6_addr(rem_addr, &remaddr);
#endif
} else {
build_ipv4_addr(local_addr, &localaddr);
build_ipv4_addr(rem_addr, &remaddr);
}
if (num < 10) {
return 1; /* error */
}
switch (state) {
case TCP_ESTABLISHED:
state_str = "ESTABLISHED";
break;
case TCP_CLOSE:
state_str = "";
break;
default:
state_str = "UNKNOWN";
break;
}
#if ENABLE_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
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# define notnull(A) (A.sin_addr.s_addr)
#endif
{
int have_remaddr = notnull(remaddr);
if ((have_remaddr && (flags & NETSTAT_CONNECTED))
|| (!have_remaddr && (flags & NETSTAT_LISTENING))
) {
char *l = ip_port_str(
(struct sockaddr *) &localaddr, local_port,
"udp", flags & NETSTAT_NUMERIC);
char *r = ip_port_str(
(struct sockaddr *) &remaddr, rem_port,
"udp", flags & NETSTAT_NUMERIC);
printf(net_conn_line,
"udp", rxq, txq, l, r, state_str);
free(l);
free(r);
}
}
return 0;
}
static int raw_do_one(int lnr, char *line)
{
char local_addr[64], rem_addr[64];
char more[512];
int num, local_port, rem_port, d, state, timer_run, uid, timeout;
#if ENABLE_FEATURE_IPV6
struct sockaddr_in6 localaddr, remaddr;
#else
struct sockaddr_in localaddr, remaddr;
#endif
unsigned long rxq, txq, time_len, retr, inode;
if (lnr == 0)
return 0;
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 ENABLE_FEATURE_IPV6
build_ipv6_addr(local_addr, &localaddr);
build_ipv6_addr(rem_addr, &remaddr);
#endif
} else {
build_ipv4_addr(local_addr, &localaddr);
build_ipv4_addr(rem_addr, &remaddr);
}
if (num < 10) {
return 1; /* error */
}
{
int have_remaddr = notnull(remaddr);
if ((have_remaddr && (flags & NETSTAT_CONNECTED))
|| (!have_remaddr && (flags & NETSTAT_LISTENING))
) {
char *l = ip_port_str(
(struct sockaddr *) &localaddr, local_port,
"raw", flags & NETSTAT_NUMERIC);
char *r = ip_port_str(
(struct sockaddr *) &remaddr, rem_port,
"raw", flags & NETSTAT_NUMERIC);
printf(net_conn_line,
"raw", rxq, txq, l, r, itoa(state));
free(l);
free(r);
}
}
return 0;
}
static int unix_do_one(int nr, char *line)
{
unsigned long refcnt, proto, unix_flags;
unsigned long inode;
int type, state;
int num, path_ofs;
void *d;
const char *ss_proto, *ss_state, *ss_type;
char ss_flags[32];
if (nr == 0)
return 0; /* skip header */
/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
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* Other users report long lines filled by NUL bytes.
* (those ^@ are NUL bytes too). We see them as empty lines. */
if (!line[0])
return 0;
path_ofs = 0; /* paranoia */
num = sscanf(line, "%p: %lX %lX %lX %X %X %lu %n",
&d, &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
if (num < 7) {
return 1; /* error */
}
if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
if (!(flags & NETSTAT_LISTENING))
return 0;
} else {
if (!(flags & NETSTAT_CONNECTED))
return 0;
}
}
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 %6lu ",
ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
);
/* TODO: currently we stop at first NUL byte. Is it a problem? */
line += path_ofs;
*strchrnul(line, '\n') = '\0';
while (*line)
fputc_printable(*line++, stdout);
bb_putchar('\n');
return 0;
}
#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, int (*proc)(int, char *))
{
int lnr;
FILE *procinfo;
char *buffer;
procinfo = fopen(file, "r");
if (procinfo == NULL) {
if (errno != ENOENT) {
bb_simple_perror_msg(file);
} else {
bb_error_msg("no kernel support for %s", name);
}
return;
}
lnr = 0;
/* Why? because xmalloc_fgets_str doesn't stop on NULs */
while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
if (proc(lnr++, buffer))
bb_error_msg("%s: bogus data on line %d", file, lnr);
free(buffer);
}
fclose(procinfo);
}
int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int netstat_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
unsigned opt;
#if ENABLE_FEATURE_IPV6
smallint inet = 1;
smallint inet6 = 1;
#else
enum { inet = 1, inet6 = 0 };
#endif
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/* Option string must match NETSTAT_xxx constants */
opt = getopt32(argv, NETSTAT_OPTS);
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if (opt & 0x1) { // -l
flags &= ~NETSTAT_CONNECTED;
flags |= NETSTAT_LISTENING;
}
if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
//if (opt & 0x4) // -e
if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n
//if (opt & 0x10) // -t: NETSTAT_TCP
//if (opt & 0x20) // -u: NETSTAT_UDP
//if (opt & 0x40) // -w: NETSTAT_RAW
//if (opt & 0x80) // -x: NETSTAT_UNIX
if (opt & OPT_showroute) { // -r
#if ENABLE_ROUTE
bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
return 0;
#else
bb_show_usage();
#endif
}
if (opt & OPT_widedisplay) { // -W
net_conn_line = PRINT_NET_CONN_WIDE;
net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
}
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opt &= NETSTAT_ALLPROTO;
if (opt) {
flags &= ~NETSTAT_ALLPROTO;
flags |= opt;
}
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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(net_conn_line_header, "Local Address", "Foreign Address");
}
if (inet && flags & NETSTAT_TCP)
do_info(_PATH_PROCNET_TCP, "AF INET (tcp)", tcp_do_one);
#if ENABLE_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);
#if ENABLE_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);
#if ENABLE_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;
}