busybox/networking/netstat.c

/* 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>
 *
 * 2008-07-10
 * optional '-p' flag support ported from net-tools by G. Somlo <somlo@cmu.edu>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"
#include "inet_common.h"

#define NETSTAT_OPTS "laentuwx" \
	IF_ROUTE(               "r") \
	IF_FEATURE_NETSTAT_WIDE("W") \
	IF_FEATURE_NETSTAT_PRG( "p")

enum {
	OPTBIT_KEEP_OLD = 7,
	IF_ROUTE(               OPTBIT_ROUTE,)
	IF_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
	IF_FEATURE_NETSTAT_PRG( OPTBIT_PRG  ,)
	OPT_sock_listen = 1 << 0, // l
	OPT_sock_all    = 1 << 1, // a
	OPT_extended    = 1 << 2, // e
	OPT_noresolve   = 1 << 3, // n
	OPT_sock_tcp    = 1 << 4, // t
	OPT_sock_udp    = 1 << 5, // u
	OPT_sock_raw    = 1 << 6, // w
	OPT_sock_unix   = 1 << 7, // x
	OPT_route       = IF_ROUTE(               (1 << OPTBIT_ROUTE)) + 0, // r
	OPT_wide        = IF_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W
	OPT_prg         = IF_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG  )) + 0, // p
};

#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)


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"
#define PRINT_NET_CONN_HEADER       "\nProto Recv-Q Send-Q %-23s %-23s State       "

/* 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"
#define PRINT_NET_CONN_HEADER_WIDE  "\nProto Recv-Q Send-Q %-51s %-51s State       "

#define PROGNAME_WIDTH     20
#define PROGNAME_WIDTH_STR "20"
/* PROGNAME_WIDTH chars: 12345678901234567890 */
#define PROGNAME_BANNER "PID/Program name    "

struct prg_node {
	struct prg_node *next;
	long inode;
	char name[PROGNAME_WIDTH];
};

#define PRG_HASH_SIZE 211

struct globals {
	const char *net_conn_line;
	smallint flags;
#if ENABLE_FEATURE_NETSTAT_PRG
	smallint prg_cache_loaded;
	struct prg_node *prg_hash[PRG_HASH_SIZE];
#endif
};
#define G (*ptr_to_globals)
#define flags            (G.flags           )
#define net_conn_line    (G.net_conn_line   )
#define prg_hash         (G.prg_hash        )
#define prg_cache_loaded (G.prg_cache_loaded)
#define INIT_G() do { \
	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
	flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; \
	net_conn_line = PRINT_NET_CONN; \
} while (0)


#if ENABLE_FEATURE_NETSTAT_PRG

/* Deliberately truncating long to unsigned *int* */
#define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)

#define print_progname_banner() do { \
	if (option_mask32 & OPT_prg) printf(PROGNAME_BANNER); \
} while (0)

static void prg_cache_add(long inode, char *name)
{
	unsigned hi = PRG_HASHIT(inode);
	struct prg_node **pnp, *pn;

	prg_cache_loaded = 2;
	for (pnp = prg_hash + hi; (pn = *pnp) != NULL; pnp = &pn->next) {
		if (pn->inode == inode) {
			/* Some warning should be appropriate here
			   as we got multiple processes for one i-node */
			return;
		}
	}
	*pnp = xzalloc(sizeof(struct prg_node));
	pn = *pnp;
	pn->inode = inode;
	safe_strncpy(pn->name, name, PROGNAME_WIDTH);
}

static const char *prg_cache_get(long inode)
{
	unsigned hi = PRG_HASHIT(inode);
	struct prg_node *pn;

	for (pn = prg_hash[hi]; pn; pn = pn->next)
		if (pn->inode == inode)
			return pn->name;
	return "-";
}

#if ENABLE_FEATURE_CLEAN_UP
static void prg_cache_clear(void)
{
	struct prg_node **pnp, *pn;

	for (pnp = prg_hash; pnp < prg_hash + PRG_HASH_SIZE; pnp++) {
		while ((pn = *pnp) != NULL) {
			*pnp = pn->next;
			free(pn);
		}
	}
}
#else
#define prg_cache_clear() ((void)0)
#endif

static long extract_socket_inode(const char *lname)
{
	long inode = -1;

	if (strncmp(lname, "socket:[", sizeof("socket:[")-1) == 0) {
		/* "socket:[12345]", extract the "12345" as inode */
		inode = bb_strtol(lname + sizeof("socket:[")-1, (char**)&lname, 0);
		if (*lname != ']')
			inode = -1;
	} else if (strncmp(lname, "[0000]:", sizeof("[0000]:")-1) == 0) {
		/* "[0000]:12345", extract the "12345" as inode */
		inode = bb_strtol(lname + sizeof("[0000]:")-1, NULL, 0);
		if (errno) /* not NUL terminated? */
			inode = -1;
	}

#if 0 /* bb_strtol returns all-ones bit pattern on ERANGE anyway */
	if (errno == ERANGE)
		inode = -1;
#endif
	return inode;
}

static int FAST_FUNC file_act(const char *fileName,
		struct stat *statbuf UNUSED_PARAM,
		void *userData,
		int depth UNUSED_PARAM)
{
	char *linkname;
	long inode;

	linkname = xmalloc_readlink(fileName);
	if (linkname != NULL) {
		inode = extract_socket_inode(linkname);
		free(linkname);
		if (inode >= 0)
			prg_cache_add(inode, (char *)userData);
	}
	return TRUE;
}

static int FAST_FUNC dir_act(const char *fileName,
		struct stat *statbuf UNUSED_PARAM,
		void *userData UNUSED_PARAM,
		int depth)
{
	const char *shortName;
	char *p, *q;
	char cmdline_buf[512];
	int i;

	if (depth == 0) /* "/proc" itself */
		return TRUE; /* continue looking one level below /proc */

	shortName = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
	if (!isdigit(shortName[0])) /* skip /proc entries whic aren't processes */
		return SKIP;

	p = concat_path_file(fileName, "cmdline"); /* "/proc/PID/cmdline" */
	i = open_read_close(p, cmdline_buf, sizeof(cmdline_buf) - 1);
	free(p);
	if (i < 0)
		return FALSE;
	cmdline_buf[i] = '\0';
	q = concat_path_file(shortName, bb_basename(cmdline_buf)); /* "PID/argv0" */

	/* go through all files in /proc/PID/fd */
	p = concat_path_file(fileName, "fd");
	i = recursive_action(p, ACTION_RECURSE | ACTION_QUIET,
				file_act, NULL, (void *)q, 0);

	free(p);
	free(q);

	if (!i)
		return FALSE;	/* signal permissions error to caller */

	return SKIP;		/* caller should not recurse further into this dir. */
}

static void prg_cache_load(void)
{
	int load_ok;

	prg_cache_loaded = 1;
	load_ok = recursive_action("/proc", ACTION_RECURSE | ACTION_QUIET,
				NULL, dir_act, NULL, 0);
	if (load_ok)
		return;

	if (prg_cache_loaded == 1)
		bb_error_msg("can't scan /proc - are you root?");
	else
		bb_error_msg("showing only processes with your user ID");
}

#else

#define prg_cache_clear()       ((void)0)
#define print_progname_banner() ((void)0)

#endif //ENABLE_FEATURE_NETSTAT_PRG


#if ENABLE_FEATURE_IPV6
static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
{
	char addr6[INET6_ADDRSTRLEN];
	struct in6_addr in6;

	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, &localaddr->sin6_addr);

	localaddr->sin6_family = AF_INET6;
}
#endif

static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
{
	sscanf(local_addr, "%X", &localaddr->sin_addr.s_addr);
	localaddr->sin_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)
{
	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;
}

struct inet_params {
	int local_port, rem_port, state, uid;
	union {
		struct sockaddr     sa;
		struct sockaddr_in  sin;
#if ENABLE_FEATURE_IPV6
		struct sockaddr_in6 sin6;
#endif
	} localaddr, remaddr;
	unsigned long rxq, txq, inode;
};

static int scan_inet_proc_line(struct inet_params *param, char *line)
{
	int num;
	char local_addr[64], rem_addr[64];

	num = sscanf(line,
			"%*d: %64[0-9A-Fa-f]:%X "
			"%64[0-9A-Fa-f]:%X %X "
			"%lX:%lX %*X:%*X "
			"%*X %d %*d %ld ",
			local_addr, &param->local_port,
			rem_addr, &param->rem_port, &param->state,
			&param->txq, &param->rxq,
			&param->uid, &param->inode);
	if (num < 9) {
		return 1; /* error */
	}

	if (strlen(local_addr) > 8) {
#if ENABLE_FEATURE_IPV6
		build_ipv6_addr(local_addr, &param->localaddr.sin6);
		build_ipv6_addr(rem_addr, &param->remaddr.sin6);
#endif
	} else {
		build_ipv4_addr(local_addr, &param->localaddr.sin);
		build_ipv4_addr(rem_addr, &param->remaddr.sin);
	}
	return 0;
}

static void print_inet_line(struct inet_params *param,
		const char *state_str, const char *proto, int is_connected)
{
	if ((is_connected && (flags & NETSTAT_CONNECTED))
	 || (!is_connected && (flags & NETSTAT_LISTENING))
	) {
		char *l = ip_port_str(
				&param->localaddr.sa, param->local_port,
				proto, flags & NETSTAT_NUMERIC);
		char *r = ip_port_str(
				&param->remaddr.sa, param->rem_port,
				proto, flags & NETSTAT_NUMERIC);
		printf(net_conn_line,
			proto, param->rxq, param->txq, l, r, state_str);
#if ENABLE_FEATURE_NETSTAT_PRG
		if (option_mask32 & OPT_prg)
			printf("%."PROGNAME_WIDTH_STR"s", prg_cache_get(param->inode));
#endif
		bb_putchar('\n');
		free(l);
		free(r);
	}
}

static int FAST_FUNC tcp_do_one(char *line)
{
	struct inet_params param;

	if (scan_inet_proc_line(&param, line))
		return 1;

	print_inet_line(&param, tcp_state[param.state], "tcp", param.rem_port);
	return 0;
}

#if ENABLE_FEATURE_IPV6
# define NOT_NULL_ADDR(A) ( \
	( (A.sa.sa_family == AF_INET6) \
	  && (A.sin6.sin6_addr.s6_addr32[0] | A.sin6.sin6_addr.s6_addr32[1] | \
	      A.sin6.sin6_addr.s6_addr32[2] | A.sin6.sin6_addr.s6_addr32[3])  \
	) || ( \
	  (A.sa.sa_family == AF_INET) \
	  && A.sin.sin_addr.s_addr != 0 \
	) \
)
#else
# define NOT_NULL_ADDR(A) (A.sin.sin_addr.s_addr)
#endif

static int FAST_FUNC udp_do_one(char *line)
{
	int have_remaddr;
	const char *state_str;
	struct inet_params param;

	if (scan_inet_proc_line(&param, line))
		return 1;

	state_str = "UNKNOWN";
	switch (param.state) {
	case TCP_ESTABLISHED:
		state_str = "ESTABLISHED";
		break;
	case TCP_CLOSE:
		state_str = "";
		break;
	}

	have_remaddr = NOT_NULL_ADDR(param.remaddr);
	print_inet_line(&param, state_str, "udp", have_remaddr);
	return 0;
}

static int FAST_FUNC raw_do_one(char *line)
{
	int have_remaddr;
	struct inet_params param;

	if (scan_inet_proc_line(&param, line))
		return 1;

	have_remaddr = NOT_NULL_ADDR(param.remaddr);
	print_inet_line(&param, itoa(param.state), "raw", have_remaddr);
	return 0;
}

static int FAST_FUNC unix_do_one(char *line)
{
	unsigned long refcnt, proto, unix_flags;
	unsigned long inode;
	int type, state;
	int num, path_ofs;
	const char *ss_proto, *ss_state, *ss_type;
	char ss_flags[32];

	/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
	 * 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",
			&refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
	if (num < 6) {
		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
		);

#if ENABLE_FEATURE_NETSTAT_PRG
	if (option_mask32 & OPT_prg)
		printf("%-"PROGNAME_WIDTH_STR"s", prg_cache_get(inode));
#endif

	/* 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;
}

static void do_info(const char *file, int FAST_FUNC (*proc)(char *))
{
	int lnr;
	FILE *procinfo;
	char *buffer;

	/* _stdin is just to save "r" param */
	procinfo = fopen_or_warn_stdin(file);
	if (procinfo == NULL) {
		return;
	}
	lnr = 0;
	/* Why xmalloc_fgets_str? because it doesn't stop on NULs */
	while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
		/* line 0 is skipped */
		if (lnr && proc(buffer))
			bb_error_msg("%s: bogus data on line %d", file, lnr + 1);
		lnr++;
		free(buffer);
	}
	fclose(procinfo);
}

int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int netstat_main(int argc UNUSED_PARAM, char **argv)
{
	const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
	unsigned opt;

	INIT_G();

	/* Option string must match NETSTAT_xxx constants */
	opt = getopt32(argv, NETSTAT_OPTS);
	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_route) { // -r
#if ENABLE_ROUTE
		bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
		return 0;
#else
		bb_show_usage();
#endif
	}
	if (opt & OPT_wide) { // -W
		net_conn_line = PRINT_NET_CONN_WIDE;
		net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
	}
#if ENABLE_FEATURE_NETSTAT_PRG
	if (opt & OPT_prg) { // -p
		prg_cache_load();
	}
#endif

	opt &= NETSTAT_ALLPROTO;
	if (opt) {
		flags &= ~NETSTAT_ALLPROTO;
		flags |= opt;
	}
	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");
		print_progname_banner();
		bb_putchar('\n');
	}
	if (flags & NETSTAT_TCP) {
		do_info("/proc/net/tcp", tcp_do_one);
#if ENABLE_FEATURE_IPV6
		do_info("/proc/net/tcp6", tcp_do_one);
#endif
	}
	if (flags & NETSTAT_UDP) {
		do_info("/proc/net/udp", udp_do_one);
#if ENABLE_FEATURE_IPV6
		do_info("/proc/net/udp6", udp_do_one);
#endif
	}
	if (flags & NETSTAT_RAW) {
		do_info("/proc/net/raw", raw_do_one);
#if ENABLE_FEATURE_IPV6
		do_info("/proc/net/raw6", 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 ");
		print_progname_banner();
		printf("Path\n");
		do_info("/proc/net/unix", unix_do_one);
	}
	prg_cache_clear();
	return 0;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini netstat implementation(s) for busybox
4	* based in part on the netstat implementation from net-tools.
5	*
6	* Copyright (C) 2002 by Bart Visscher <magick@linux-fan.com>
7	*
8	* 2002-04-20
9	* IPV6 support added by Bart Visscher <magick@linux-fan.com>
10	*
11	* 2008-07-10
12	* optional '-p' flag support ported from net-tools by G. Somlo <somlo@cmu.edu>
13	*
14	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15	*/
16
17	#include "libbb.h"
18	#include "inet_common.h"
19
20	#define NETSTAT_OPTS "laentuwx" \
21	IF_ROUTE( "r") \
22	IF_FEATURE_NETSTAT_WIDE("W") \
23	IF_FEATURE_NETSTAT_PRG( "p")
24
25	enum {
26	OPTBIT_KEEP_OLD = 7,
27	IF_ROUTE( OPTBIT_ROUTE,)
28	IF_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
29	IF_FEATURE_NETSTAT_PRG( OPTBIT_PRG ,)
30	OPT_sock_listen = 1 << 0, // l
31	OPT_sock_all = 1 << 1, // a
32	OPT_extended = 1 << 2, // e
33	OPT_noresolve = 1 << 3, // n
34	OPT_sock_tcp = 1 << 4, // t
35	OPT_sock_udp = 1 << 5, // u
36	OPT_sock_raw = 1 << 6, // w
37	OPT_sock_unix = 1 << 7, // x
38	OPT_route = IF_ROUTE( (1 << OPTBIT_ROUTE)) + 0, // r
39	OPT_wide = IF_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W
40	OPT_prg = IF_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG )) + 0, // p
41	};
42
43	#define NETSTAT_CONNECTED 0x01
44	#define NETSTAT_LISTENING 0x02
45	#define NETSTAT_NUMERIC 0x04
46	/* Must match getopt32 option string */
47	#define NETSTAT_TCP 0x10
48	#define NETSTAT_UDP 0x20
49	#define NETSTAT_RAW 0x40
50	#define NETSTAT_UNIX 0x80
51	#define NETSTAT_ALLPROTO (NETSTAT_TCP\|NETSTAT_UDP\|NETSTAT_RAW\|NETSTAT_UNIX)
52
53
54	enum {
55	TCP_ESTABLISHED = 1,
56	TCP_SYN_SENT,
57	TCP_SYN_RECV,
58	TCP_FIN_WAIT1,
59	TCP_FIN_WAIT2,
60	TCP_TIME_WAIT,
61	TCP_CLOSE,
62	TCP_CLOSE_WAIT,
63	TCP_LAST_ACK,
64	TCP_LISTEN,
65	TCP_CLOSING, /* now a valid state */
66	};
67
68	static const char *const tcp_state[] = {
69	"",
70	"ESTABLISHED",
71	"SYN_SENT",
72	"SYN_RECV",
73	"FIN_WAIT1",
74	"FIN_WAIT2",
75	"TIME_WAIT",
76	"CLOSE",
77	"CLOSE_WAIT",
78	"LAST_ACK",
79	"LISTEN",
80	"CLOSING"
81	};
82
83	typedef enum {
84	SS_FREE = 0, /* not allocated */
85	SS_UNCONNECTED, /* unconnected to any socket */
86	SS_CONNECTING, /* in process of connecting */
87	SS_CONNECTED, /* connected to socket */
88	SS_DISCONNECTING /* in process of disconnecting */
89	} socket_state;
90
91	#define SO_ACCEPTCON (1<<16) /* performed a listen */
92	#define SO_WAITDATA (1<<17) /* wait data to read */
93	#define SO_NOSPACE (1<<18) /* no space to write */
94
95	/* Standard printout size */
96	#define PRINT_IP_MAX_SIZE 23
97	#define PRINT_NET_CONN "%s %6ld %6ld %-23s %-23s %-12s"
98	#define PRINT_NET_CONN_HEADER "\nProto Recv-Q Send-Q %-23s %-23s State "
99
100	/* When there are IPv6 connections the IPv6 addresses will be
101	* truncated to none-recognition. The '-W' option makes the
102	* address columns wide enough to accomodate for longest possible
103	* IPv6 addresses, i.e. addresses of the form
104	* xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
105	*/
106	#define PRINT_IP_MAX_SIZE_WIDE 51 /* INET6_ADDRSTRLEN + 5 for the port number */
107	#define PRINT_NET_CONN_WIDE "%s %6ld %6ld %-51s %-51s %-12s"
108	#define PRINT_NET_CONN_HEADER_WIDE "\nProto Recv-Q Send-Q %-51s %-51s State "
109
110	#define PROGNAME_WIDTH 20
111	#define PROGNAME_WIDTH_STR "20"
112	/* PROGNAME_WIDTH chars: 12345678901234567890 */
113	#define PROGNAME_BANNER "PID/Program name "
114
115	struct prg_node {
116	struct prg_node *next;
117	long inode;
118	char name[PROGNAME_WIDTH];
119	};
120
121	#define PRG_HASH_SIZE 211
122
123	struct globals {
124	const char *net_conn_line;
125	smallint flags;
126	#if ENABLE_FEATURE_NETSTAT_PRG
127	smallint prg_cache_loaded;
128	struct prg_node *prg_hash[PRG_HASH_SIZE];
129	#endif
130	};
131	#define G (*ptr_to_globals)
132	#define flags (G.flags )
133	#define net_conn_line (G.net_conn_line )
134	#define prg_hash (G.prg_hash )
135	#define prg_cache_loaded (G.prg_cache_loaded)
136	#define INIT_G() do { \
137	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
138	flags = NETSTAT_CONNECTED \| NETSTAT_ALLPROTO; \
139	net_conn_line = PRINT_NET_CONN; \
140	} while (0)
141
142
143	#if ENABLE_FEATURE_NETSTAT_PRG
144
145	/* Deliberately truncating long to unsigned int */
146	#define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)
147
148	#define print_progname_banner() do { \
149	if (option_mask32 & OPT_prg) printf(PROGNAME_BANNER); \
150	} while (0)
151
152	static void prg_cache_add(long inode, char *name)
153	{
154	unsigned hi = PRG_HASHIT(inode);
155	struct prg_node *pnp, pn;
156
157	prg_cache_loaded = 2;
158	for (pnp = prg_hash + hi; (pn = *pnp) != NULL; pnp = &pn->next) {
159	if (pn->inode == inode) {
160	/* Some warning should be appropriate here
161	as we got multiple processes for one i-node */
162	return;
163	}
164	}
165	*pnp = xzalloc(sizeof(struct prg_node));
166	pn = *pnp;
167	pn->inode = inode;
168	safe_strncpy(pn->name, name, PROGNAME_WIDTH);
169	}
170
171	static const char *prg_cache_get(long inode)
172	{
173	unsigned hi = PRG_HASHIT(inode);
174	struct prg_node *pn;
175
176	for (pn = prg_hash[hi]; pn; pn = pn->next)
177	if (pn->inode == inode)
178	return pn->name;
179	return "-";
180	}
181
182	#if ENABLE_FEATURE_CLEAN_UP
183	static void prg_cache_clear(void)
184	{
185	struct prg_node *pnp, pn;
186
187	for (pnp = prg_hash; pnp < prg_hash + PRG_HASH_SIZE; pnp++) {
188	while ((pn = *pnp) != NULL) {
189	*pnp = pn->next;
190	free(pn);
191	}
192	}
193	}
194	#else
195	#define prg_cache_clear() ((void)0)
196	#endif
197
198	static long extract_socket_inode(const char *lname)
199	{
200	long inode = -1;
201
202	if (strncmp(lname, "socket:[", sizeof("socket:[")-1) == 0) {
203	/* "socket:[12345]", extract the "12345" as inode */
204	inode = bb_strtol(lname + sizeof("socket:[")-1, (char**)&lname, 0);
205	if (*lname != ']')
206	inode = -1;
207	} else if (strncmp(lname, "[0000]:", sizeof("[0000]:")-1) == 0) {
208	/* "[0000]:12345", extract the "12345" as inode */
209	inode = bb_strtol(lname + sizeof("[0000]:")-1, NULL, 0);
210	if (errno) /* not NUL terminated? */
211	inode = -1;
212	}
213
214	#if 0 /* bb_strtol returns all-ones bit pattern on ERANGE anyway */
215	if (errno == ERANGE)
216	inode = -1;
217	#endif
218	return inode;
219	}
220
221	static int FAST_FUNC file_act(const char *fileName,
222	struct stat *statbuf UNUSED_PARAM,
223	void *userData,
224	int depth UNUSED_PARAM)
225	{
226	char *linkname;
227	long inode;
228
229	linkname = xmalloc_readlink(fileName);
230	if (linkname != NULL) {
231	inode = extract_socket_inode(linkname);
232	free(linkname);
233	if (inode >= 0)
234	prg_cache_add(inode, (char *)userData);
235	}
236	return TRUE;
237	}
238
239	static int FAST_FUNC dir_act(const char *fileName,
240	struct stat *statbuf UNUSED_PARAM,
241	void *userData UNUSED_PARAM,
242	int depth)
243	{
244	const char *shortName;
245	char p, q;
246	char cmdline_buf[512];
247	int i;
248
249	if (depth == 0) /* "/proc" itself */
250	return TRUE; /* continue looking one level below /proc */
251
252	shortName = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
253	if (!isdigit(shortName[0])) /* skip /proc entries whic aren't processes */
254	return SKIP;
255
256	p = concat_path_file(fileName, "cmdline"); /* "/proc/PID/cmdline" */
257	i = open_read_close(p, cmdline_buf, sizeof(cmdline_buf) - 1);
258	free(p);
259	if (i < 0)
260	return FALSE;
261	cmdline_buf[i] = '\0';
262	q = concat_path_file(shortName, bb_basename(cmdline_buf)); /* "PID/argv0" */
263
264	/* go through all files in /proc/PID/fd */
265	p = concat_path_file(fileName, "fd");
266	i = recursive_action(p, ACTION_RECURSE \| ACTION_QUIET,
267	file_act, NULL, (void *)q, 0);
268
269	free(p);
270	free(q);
271
272	if (!i)
273	return FALSE; /* signal permissions error to caller */
274
275	return SKIP; /* caller should not recurse further into this dir. */
276	}
277
278	static void prg_cache_load(void)
279	{
280	int load_ok;
281
282	prg_cache_loaded = 1;
283	load_ok = recursive_action("/proc", ACTION_RECURSE \| ACTION_QUIET,
284	NULL, dir_act, NULL, 0);
285	if (load_ok)
286	return;
287
288	if (prg_cache_loaded == 1)
289	bb_error_msg("can't scan /proc - are you root?");
290	else
291	bb_error_msg("showing only processes with your user ID");
292	}
293
294	#else
295
296	#define prg_cache_clear() ((void)0)
297	#define print_progname_banner() ((void)0)
298
299	#endif //ENABLE_FEATURE_NETSTAT_PRG
300
301
302	#if ENABLE_FEATURE_IPV6
303	static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
304	{
305	char addr6[INET6_ADDRSTRLEN];
306	struct in6_addr in6;
307
308	sscanf(local_addr, "%08X%08X%08X%08X",
309	&in6.s6_addr32[0], &in6.s6_addr32[1],
310	&in6.s6_addr32[2], &in6.s6_addr32[3]);
311	inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
312	inet_pton(AF_INET6, addr6, &localaddr->sin6_addr);
313
314	localaddr->sin6_family = AF_INET6;
315	}
316	#endif
317
318	static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
319	{
320	sscanf(local_addr, "%X", &localaddr->sin_addr.s_addr);
321	localaddr->sin_family = AF_INET;
322	}
323
324	static const char get_sname(int port, const char proto, int numeric)
325	{
326	if (!port)
327	return "*";
328	if (!numeric) {
329	struct servent *se = getservbyport(port, proto);
330	if (se)
331	return se->s_name;
332	}
333	/* hummm, we may return static buffer here!! */
334	return itoa(ntohs(port));
335	}
336
337	static char ip_port_str(struct sockaddr addr, int port, const char *proto, int numeric)
338	{
339	char host, host_port;
340
341	/* Code which used "*" for INADDR_ANY is removed: it's ambiguous
342	* in IPv6, while "0.0.0.0" is not. */
343
344	host = numeric ? xmalloc_sockaddr2dotted_noport(addr)
345	: xmalloc_sockaddr2host_noport(addr);
346
347	host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
348	free(host);
349	return host_port;
350	}
351
352	struct inet_params {
353	int local_port, rem_port, state, uid;
354	union {
355	struct sockaddr sa;
356	struct sockaddr_in sin;
357	#if ENABLE_FEATURE_IPV6
358	struct sockaddr_in6 sin6;
359	#endif
360	} localaddr, remaddr;
361	unsigned long rxq, txq, inode;
362	};
363
364	static int scan_inet_proc_line(struct inet_params param, char line)
365	{
366	int num;
367	char local_addr[64], rem_addr[64];
368
369	num = sscanf(line,
370	"%*d: %64[0-9A-Fa-f]:%X "
371	"%64[0-9A-Fa-f]:%X %X "
372	"%lX:%lX %X:%X "
373	"%X %d %d %ld ",
374	local_addr, &param->local_port,
375	rem_addr, &param->rem_port, &param->state,
376	&param->txq, &param->rxq,
377	&param->uid, &param->inode);
378	if (num < 9) {
379	return 1; /* error */
380	}
381
382	if (strlen(local_addr) > 8) {
383	#if ENABLE_FEATURE_IPV6
384	build_ipv6_addr(local_addr, &param->localaddr.sin6);
385	build_ipv6_addr(rem_addr, &param->remaddr.sin6);
386	#endif
387	} else {
388	build_ipv4_addr(local_addr, &param->localaddr.sin);
389	build_ipv4_addr(rem_addr, &param->remaddr.sin);
390	}
391	return 0;
392	}
393
394	static void print_inet_line(struct inet_params *param,
395	const char state_str, const char proto, int is_connected)
396	{
397	if ((is_connected && (flags & NETSTAT_CONNECTED))
398	\|\| (!is_connected && (flags & NETSTAT_LISTENING))
399	) {
400	char *l = ip_port_str(
401	&param->localaddr.sa, param->local_port,
402	proto, flags & NETSTAT_NUMERIC);
403	char *r = ip_port_str(
404	&param->remaddr.sa, param->rem_port,
405	proto, flags & NETSTAT_NUMERIC);
406	printf(net_conn_line,
407	proto, param->rxq, param->txq, l, r, state_str);
408	#if ENABLE_FEATURE_NETSTAT_PRG
409	if (option_mask32 & OPT_prg)
410	printf("%."PROGNAME_WIDTH_STR"s", prg_cache_get(param->inode));
411	#endif
412	bb_putchar('\n');
413	free(l);
414	free(r);
415	}
416	}
417
418	static int FAST_FUNC tcp_do_one(char *line)
419	{
420	struct inet_params param;
421
422	if (scan_inet_proc_line(&param, line))
423	return 1;
424
425	print_inet_line(&param, tcp_state[param.state], "tcp", param.rem_port);
426	return 0;
427	}
428
429	#if ENABLE_FEATURE_IPV6
430	# define NOT_NULL_ADDR(A) ( \
431	( (A.sa.sa_family == AF_INET6) \
432	&& (A.sin6.sin6_addr.s6_addr32[0] \| A.sin6.sin6_addr.s6_addr32[1] \| \
433	A.sin6.sin6_addr.s6_addr32[2] \| A.sin6.sin6_addr.s6_addr32[3]) \
434	) \|\| ( \
435	(A.sa.sa_family == AF_INET) \
436	&& A.sin.sin_addr.s_addr != 0 \
437	) \
438	)
439	#else
440	# define NOT_NULL_ADDR(A) (A.sin.sin_addr.s_addr)
441	#endif
442
443	static int FAST_FUNC udp_do_one(char *line)
444	{
445	int have_remaddr;
446	const char *state_str;
447	struct inet_params param;
448
449	if (scan_inet_proc_line(&param, line))
450	return 1;
451
452	state_str = "UNKNOWN";
453	switch (param.state) {
454	case TCP_ESTABLISHED:
455	state_str = "ESTABLISHED";
456	break;
457	case TCP_CLOSE:
458	state_str = "";
459	break;
460	}
461
462	have_remaddr = NOT_NULL_ADDR(param.remaddr);
463	print_inet_line(&param, state_str, "udp", have_remaddr);
464	return 0;
465	}
466
467	static int FAST_FUNC raw_do_one(char *line)
468	{
469	int have_remaddr;
470	struct inet_params param;
471
472	if (scan_inet_proc_line(&param, line))
473	return 1;
474
475	have_remaddr = NOT_NULL_ADDR(param.remaddr);
476	print_inet_line(&param, itoa(param.state), "raw", have_remaddr);
477	return 0;
478	}
479
480	static int FAST_FUNC unix_do_one(char *line)
481	{
482	unsigned long refcnt, proto, unix_flags;
483	unsigned long inode;
484	int type, state;
485	int num, path_ofs;
486	const char ss_proto, ss_state, *ss_type;
487	char ss_flags[32];
488
489	/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
490	* Other users report long lines filled by NUL bytes.
491	* (those ^@ are NUL bytes too). We see them as empty lines. */
492	if (!line[0])
493	return 0;
494
495	path_ofs = 0; /* paranoia */
496	num = sscanf(line, "%*p: %lX %lX %lX %X %X %lu %n",
497	&refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
498	if (num < 6) {
499	return 1; /* error */
500	}
501	if ((flags & (NETSTAT_LISTENING\|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING\|NETSTAT_CONNECTED)) {
502	if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
503	if (!(flags & NETSTAT_LISTENING))
504	return 0;
505	} else {
506	if (!(flags & NETSTAT_CONNECTED))
507	return 0;
508	}
509	}
510
511	switch (proto) {
512	case 0:
513	ss_proto = "unix";
514	break;
515	default:
516	ss_proto = "??";
517	}
518
519	switch (type) {
520	case SOCK_STREAM:
521	ss_type = "STREAM";
522	break;
523	case SOCK_DGRAM:
524	ss_type = "DGRAM";
525	break;
526	case SOCK_RAW:
527	ss_type = "RAW";
528	break;
529	case SOCK_RDM:
530	ss_type = "RDM";
531	break;
532	case SOCK_SEQPACKET:
533	ss_type = "SEQPACKET";
534	break;
535	default:
536	ss_type = "UNKNOWN";
537	}
538
539	switch (state) {
540	case SS_FREE:
541	ss_state = "FREE";
542	break;
543	case SS_UNCONNECTED:
544	/*
545	* Unconnected sockets may be listening
546	* for something.
547	*/
548	if (unix_flags & SO_ACCEPTCON) {
549	ss_state = "LISTENING";
550	} else {
551	ss_state = "";
552	}
553	break;
554	case SS_CONNECTING:
555	ss_state = "CONNECTING";
556	break;
557	case SS_CONNECTED:
558	ss_state = "CONNECTED";
559	break;
560	case SS_DISCONNECTING:
561	ss_state = "DISCONNECTING";
562	break;
563	default:
564	ss_state = "UNKNOWN";
565	}
566
567	strcpy(ss_flags, "[ ");
568	if (unix_flags & SO_ACCEPTCON)
569	strcat(ss_flags, "ACC ");
570	if (unix_flags & SO_WAITDATA)
571	strcat(ss_flags, "W ");
572	if (unix_flags & SO_NOSPACE)
573	strcat(ss_flags, "N ");
574	strcat(ss_flags, "]");
575
576	printf("%-5s %-6ld %-11s %-10s %-13s %6lu ",
577	ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
578	);
579
580	#if ENABLE_FEATURE_NETSTAT_PRG
581	if (option_mask32 & OPT_prg)
582	printf("%-"PROGNAME_WIDTH_STR"s", prg_cache_get(inode));
583	#endif
584
585	/* TODO: currently we stop at first NUL byte. Is it a problem? */
586	line += path_ofs;
587	*strchrnul(line, '\n') = '\0';
588	while (*line)
589	fputc_printable(*line++, stdout);
590	bb_putchar('\n');
591	return 0;
592	}
593
594	static void do_info(const char file, int FAST_FUNC (proc)(char *))
595	{
596	int lnr;
597	FILE *procinfo;
598	char *buffer;
599
600	/* _stdin is just to save "r" param */
601	procinfo = fopen_or_warn_stdin(file);
602	if (procinfo == NULL) {
603	return;
604	}
605	lnr = 0;
606	/* Why xmalloc_fgets_str? because it doesn't stop on NULs */
607	while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
608	/* line 0 is skipped */
609	if (lnr && proc(buffer))
610	bb_error_msg("%s: bogus data on line %d", file, lnr + 1);
611	lnr++;
612	free(buffer);
613	}
614	fclose(procinfo);
615	}
616
617	int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
618	int netstat_main(int argc UNUSED_PARAM, char **argv)
619	{
620	const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
621	unsigned opt;
622
623	INIT_G();
624
625	/* Option string must match NETSTAT_xxx constants */
626	opt = getopt32(argv, NETSTAT_OPTS);
627	if (opt & 0x1) { // -l
628	flags &= ~NETSTAT_CONNECTED;
629	flags \|= NETSTAT_LISTENING;
630	}
631	if (opt & 0x2) flags \|= NETSTAT_LISTENING \| NETSTAT_CONNECTED; // -a
632	//if (opt & 0x4) // -e
633	if (opt & 0x8) flags \|= NETSTAT_NUMERIC; // -n
634	//if (opt & 0x10) // -t: NETSTAT_TCP
635	//if (opt & 0x20) // -u: NETSTAT_UDP
636	//if (opt & 0x40) // -w: NETSTAT_RAW
637	//if (opt & 0x80) // -x: NETSTAT_UNIX
638	if (opt & OPT_route) { // -r
639	#if ENABLE_ROUTE
640	bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
641	return 0;
642	#else
643	bb_show_usage();
644	#endif
645	}
646	if (opt & OPT_wide) { // -W
647	net_conn_line = PRINT_NET_CONN_WIDE;
648	net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
649	}
650	#if ENABLE_FEATURE_NETSTAT_PRG
651	if (opt & OPT_prg) { // -p
652	prg_cache_load();
653	}
654	#endif
655
656	opt &= NETSTAT_ALLPROTO;
657	if (opt) {
658	flags &= ~NETSTAT_ALLPROTO;
659	flags \|= opt;
660	}
661	if (flags & (NETSTAT_TCP\|NETSTAT_UDP\|NETSTAT_RAW)) {
662	printf("Active Internet connections "); /* xxx */
663
664	if ((flags & (NETSTAT_LISTENING\|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING\|NETSTAT_CONNECTED))
665	printf("(servers and established)");
666	else if (flags & NETSTAT_LISTENING)
667	printf("(only servers)");
668	else
669	printf("(w/o servers)");
670	printf(net_conn_line_header, "Local Address", "Foreign Address");
671	print_progname_banner();
672	bb_putchar('\n');
673	}
674	if (flags & NETSTAT_TCP) {
675	do_info("/proc/net/tcp", tcp_do_one);
676	#if ENABLE_FEATURE_IPV6
677	do_info("/proc/net/tcp6", tcp_do_one);
678	#endif
679	}
680	if (flags & NETSTAT_UDP) {
681	do_info("/proc/net/udp", udp_do_one);
682	#if ENABLE_FEATURE_IPV6
683	do_info("/proc/net/udp6", udp_do_one);
684	#endif
685	}
686	if (flags & NETSTAT_RAW) {
687	do_info("/proc/net/raw", raw_do_one);
688	#if ENABLE_FEATURE_IPV6
689	do_info("/proc/net/raw6", raw_do_one);
690	#endif
691	}
692	if (flags & NETSTAT_UNIX) {
693	printf("Active UNIX domain sockets ");
694	if ((flags & (NETSTAT_LISTENING\|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING\|NETSTAT_CONNECTED))
695	printf("(servers and established)");
696	else if (flags & NETSTAT_LISTENING)
697	printf("(only servers)");
698	else
699	printf("(w/o servers)");
700	printf("\nProto RefCnt Flags Type State I-Node ");
701	print_progname_banner();
702	printf("Path\n");
703	do_info("/proc/net/unix", unix_do_one);
704	}
705	prg_cache_clear();
706	return 0;
707	}