text: /* 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 source tree.
   */
  
  #include "libbb.h"
  #include "inet_common.h"
  
  //usage:#define netstat_trivial_usage
  //usage:       "[-"IF_ROUTE("r")"al] [-tuwx] [-en"IF_FEATURE_NETSTAT_WIDE("W")IF_FEATURE_NETSTAT_PRG("p")"]"
  //usage:#define netstat_full_usage "\n\n"
  //usage:       "Display networking information\n"
  //usage:     "\nOptions:"
  //usage:	IF_ROUTE(
  //usage:     "\n	-r	Routing table"
  //usage:	)
  //usage:     "\n	-a	All sockets"
  //usage:     "\n	-l	Listening sockets"
  //usage:     "\n		Else: connected sockets"
  //usage:     "\n	-t	TCP sockets"
  //usage:     "\n	-u	UDP sockets"
  //usage:     "\n	-w	Raw sockets"
  //usage:     "\n	-x	Unix sockets"
  //usage:     "\n		Else: all socket types"
  //usage:     "\n	-e	Other/more information"
  //usage:     "\n	-n	Don't resolve names"
  //usage:	IF_FEATURE_NETSTAT_WIDE(
  //usage:     "\n	-W	Wide display"
  //usage:	)
  //usage:	IF_FEATURE_NETSTAT_PRG(
  //usage:     "\n	-p	Show PID/program name for sockets"
  //usage:	)
  
  #define NETSTAT_OPTS "laentuwx" \
  	IF_ROUTE(               "r") \
  	IF_FEATURE_NETSTAT_WIDE("W") \
  	IF_FEATURE_NETSTAT_PRG( "p")
  
  enum {
  	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
  	OPTBIT_x        = 7,
  	IF_ROUTE(               OPTBIT_ROUTE,)
  	IF_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
  	IF_FEATURE_NETSTAT_PRG( OPTBIT_PRG  ,)
  	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            */
  
  #define ADDR_NORMAL_WIDTH        23
  /* 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 ADDR_WIDE                51  /* INET6_ADDRSTRLEN + 5 for the port number */
  #if ENABLE_FEATURE_NETSTAT_WIDE
  # define FMT_NET_CONN_DATA       "%s   %6ld %6ld %-*s %-*s %-12s"
  # define FMT_NET_CONN_HEADER     "\nProto Recv-Q Send-Q %-*s %-*s State       %s\n"
  #else
  # define FMT_NET_CONN_DATA       "%s   %6ld %6ld %-23s %-23s %-12s"
  # define FMT_NET_CONN_HEADER     "\nProto Recv-Q Send-Q %-23s %-23s State       %s\n"
  #endif
  
  #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 {
  	smallint flags;
  #if ENABLE_FEATURE_NETSTAT_PRG
  	smallint prg_cache_loaded;
  	struct prg_node *prg_hash[PRG_HASH_SIZE];
  #endif
  #if ENABLE_FEATURE_NETSTAT_PRG
  	const char *progname_banner;
  #endif
  #if ENABLE_FEATURE_NETSTAT_WIDE
  	unsigned addr_width;
  #endif
  };
  #define G (*ptr_to_globals)
  #define flags            (G.flags           )
  #define prg_cache_loaded (G.prg_cache_loaded)
  #define prg_hash         (G.prg_hash        )
  #if ENABLE_FEATURE_NETSTAT_PRG
  # define progname_banner (G.progname_banner )
  #else
  # define progname_banner ""
  #endif
  #define INIT_G() do { \
  	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
  	flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; \
  } while (0)
  
  
  #if ENABLE_FEATURE_NETSTAT_PRG
  
  /* Deliberately truncating long to unsigned *int* */
  #define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)
  
  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_strtoul(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_strtoul(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 add_to_prg_cache_if_socket(const char *fileName,
  		struct stat *statbuf UNUSED_PARAM,
  		void *pid_slash_progname,
  		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 *)pid_slash_progname);
  	}
  	return TRUE;
  }
  
  static int FAST_FUNC dir_act(const char *fileName,
  		struct stat *statbuf UNUSED_PARAM,
  		void *userData UNUSED_PARAM,
  		int depth)
  {
  	const char *pid;
  	char *pid_slash_progname;
  	char proc_pid_fname[sizeof("/proc/%u/cmdline") + sizeof(long)*3];
  	char cmdline_buf[512];
  	int n, len;
  
  	if (depth == 0) /* "/proc" itself */
  		return TRUE; /* continue looking one level below /proc */
  
  	pid = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
  	if (!isdigit(pid[0])) /* skip /proc entries which aren't processes */
  		return SKIP;
  
  	len = snprintf(proc_pid_fname, sizeof(proc_pid_fname), "%s/cmdline", fileName);
  	n = open_read_close(proc_pid_fname, cmdline_buf, sizeof(cmdline_buf) - 1);
  	if (n < 0)
  		return FALSE;
  	cmdline_buf[n] = '\0';
  
  	/* go through all files in /proc/PID/fd and check whether they are sockets */
  	strcpy(proc_pid_fname + len - (sizeof("cmdline")-1), "fd");
  	pid_slash_progname = concat_path_file(pid, bb_basename(cmdline_buf)); /* "PID/argv0" */
  	n = recursive_action(proc_pid_fname,
  			ACTION_RECURSE | ACTION_QUIET,
  			add_to_prg_cache_if_socket,
  			NULL,
  			(void *)pid_slash_progname,
  			0);
  	free(pid_slash_progname);
  
  	if (!n)
  		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)
  
  #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;
  	/* IPv6 /proc files use 32-char hex representation
  	 * of IPv6 address, followed by :PORT_IN_HEX
  	 */
  	char local_addr[33], rem_addr[33]; /* 32 + 1 for NUL */
  
  	num = sscanf(line,
  			"%*d: %32[0-9A-Fa-f]:%X "
  			"%32[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(FMT_NET_CONN_DATA,
  			proto, param->rxq, param->txq,
  			IF_FEATURE_NETSTAT_WIDE(G.addr_width,) l,
  			IF_FEATURE_NETSTAT_WIDE(G.addr_width,) 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;
  
  	memset(&param, 0, sizeof(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;
  
  	memset(&param, 0, sizeof(param)); /* otherwise we display garbage IPv6 scope_ids */
  	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)
  {
  	unsigned opt;
  
  	INIT_G();
  
  	/* Option string must match NETSTAT_xxx constants */
  	opt = getopt32(argv, NETSTAT_OPTS);
  	if (opt & OPT_sock_listen) { // -l
  		flags &= ~NETSTAT_CONNECTED;
  		flags |= NETSTAT_LISTENING;
  	}
  	if (opt & OPT_sock_all) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
  	//if (opt & OPT_extended) // -e
  	if (opt & OPT_noresolve) flags |= NETSTAT_NUMERIC; // -n
  	//if (opt & OPT_sock_tcp) // -t: NETSTAT_TCP
  	//if (opt & OPT_sock_udp) // -u: NETSTAT_UDP
  	//if (opt & OPT_sock_raw) // -w: NETSTAT_RAW
  	//if (opt & OPT_sock_unix) // -x: NETSTAT_UNIX
  #if ENABLE_ROUTE
  	if (opt & OPT_route) { // -r
  		bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
  		return 0;
  	}
  #endif
  #if ENABLE_FEATURE_NETSTAT_WIDE
  	G.addr_width = ADDR_NORMAL_WIDTH;
  	if (opt & OPT_wide) { // -W
  		G.addr_width = ADDR_WIDE;
  	}
  #endif
  #if ENABLE_FEATURE_NETSTAT_PRG
  	progname_banner = "";
  	if (opt & OPT_prg) { // -p
  		progname_banner = PROGNAME_BANNER;
  		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(FMT_NET_CONN_HEADER,
  				IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Local Address",
  				IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Foreign Address",
  				progname_banner
  		);
  	}
  	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 %sPath\n", progname_banner);
  		do_info("/proc/net/unix", unix_do_one);
  	}
  	prg_cache_clear();
  	return 0;
  }
  