Rewrite sockstat(1) in C.

Sponsored by:	DARPA, NAI Labs

usr.bin/sockstat/Makefile

@@ -1,6 +1,7 @@
 # $FreeBSD$
 
-SCRIPTS=	sockstat.pl
+PROG=		sockstat
+WARNS?=		4
 MAN=		sockstat.1
 
 .include <bsd.prog.mk>

usr.bin/sockstat/sockstat.1

@@ -104,18 +104,18 @@ The transport protocol associated with the socket for Internet
 sockets, or the type of socket (stream or datagram) for
 .Ux
 sockets.
-.It Li ADDRESS
-.No ( Ux
-sockets only)
-For bound sockets, this is the filename of the socket.
-For other sockets, it is the name, PID and file descriptor number of
-the peer, or
-.Dq Li "(none)"
-if the socket is neither bound nor connected.
 .It Li LOCAL ADDRESS
-(Internet sockets only)
-The address the local end of the socket is bound to (see
+For Internet sockets, this is the address the local end of the socket
+is bound to (see
 .Xr getsockname 2 ) .
+For bound 
+.Ux 
+sockets, it is the socket's filename.
+For other 
+.Ux 
+sockets, it is a right arrow followed by the endpoint's filename, or
+.Dq Li ??
+if the endpoint could not be determined.
 .It Li FOREIGN ADDRESS
 (Internet sockets only)
 The address the foreign end of the socket is bound to (see

usr.bin/sockstat/sockstat.c

@@ -0,0 +1,584 @@
+/*-
+ * Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/sysctl.h>
+#include <sys/file.h>
+#include <sys/user.h>
+
+#include <sys/un.h>
+#include <sys/unpcb.h>
+
+#include <netinet/in.h>
+#include <netinet/in_pcb.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_seq.h>
+#include <netinet/tcp_var.h>
+#include <arpa/inet.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static int	 opt_4;		/* Show IPv4 sockets */
+static int	 opt_6;		/* Show IPv6 sockets */
+static int	 opt_c;		/* Show connected sockets */
+static int	 opt_l;		/* Show listening sockets */
+static int	 opt_u;		/* Show Unix domain sockets */
+static int	 opt_v;		/* Verbose mode */
+
+static int	*ports;
+
+#define INT_BIT (sizeof(int)*CHAR_BIT)
+#define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
+#define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
+
+struct sock {
+	void *socket;
+	void *pcb;
+	int vflag;
+	int family;
+	int proto;
+	const char *protoname;
+	struct sockaddr_storage laddr;
+	struct sockaddr_storage faddr;
+	struct sock *next;
+};
+
+#define HASHSIZE 1009
+static struct sock *sockhash[HASHSIZE];
+
+static struct xfile *xfiles;
+static int nxfiles;
+
+static int
+xprintf(const char *fmt, ...)
+{
+	va_list ap;
+	int len;
+
+	va_start(ap, fmt);
+	len = vprintf(fmt, ap);
+	va_end(ap);
+	if (len < 0)
+		err(1, "printf()");
+	return (len);
+}
+
+static void
+parse_ports(const char *portspec)
+{
+	const char *p, *q;
+	int port, end;
+
+	if (ports == NULL)
+		if ((ports = calloc(1, 65536 / INT_BIT)) == NULL)
+			err(1, "calloc()");
+	p = portspec;
+	while (*p != '\0') {
+		if (!isdigit(*p))
+			errx(1, "syntax error in port range");
+		for (q = p; *q != '\0' && isdigit(*q); ++q)
+			/* nothing */ ;
+		for (port = 0; p < q; ++p)
+			port = port * 10 + digittoint(*p);
+		if (port < 0 || port > 65535)
+			errx(1, "invalid port number");
+		SET_PORT(port);
+		switch (*p) {
+		case '-':
+			++p;
+			break;
+		case ',':
+			++p;
+			/* fall through */
+		case '\0':
+		default:
+			continue;
+		}
+		for (q = p; *q != '\0' && isdigit(*q); ++q)
+			/* nothing */ ;
+		for (end = 0; p < q; ++p)
+			end = end * 10 + digittoint(*p);
+		if (end < port || end > 65535)
+			errx(1, "invalid port number");
+		while (port++ < end)
+			SET_PORT(port);
+		if (*p == ',')
+			++p;
+	}
+}
+
+static void
+sockaddr(struct sockaddr_storage *sa, int af, void *addr, int port)
+{
+	struct sockaddr_in *sin4;
+	struct sockaddr_in6 *sin6;
+
+	bzero(sa, sizeof *sa);
+	switch (af) {
+	case AF_INET:
+		sin4 = (struct sockaddr_in *)sa;
+		sin4->sin_len = sizeof *sin4;
+		sin4->sin_family = af;
+		sin4->sin_port = port;
+		sin4->sin_addr = *(struct in_addr *)addr;
+		break;
+	case AF_INET6:
+		sin6 = (struct sockaddr_in6 *)sa;
+		sin6->sin6_len = sizeof *sin6;
+		sin6->sin6_family = af;
+		sin6->sin6_port = port;
+		sin6->sin6_addr = *(struct in6_addr *)addr;
+		break;
+	default:
+		abort();
+	}
+}
+
+static void
+gather_inet(int proto)
+{
+	struct xinpgen *xig, *exig;
+	struct xinpcb *xip;
+	struct xtcpcb *xtp;
+	struct inpcb *inp;
+	struct xsocket *so;
+	struct sock *sock;
+	const char *varname, *protoname;
+	size_t len, bufsize;
+	void *buf;
+	int hash, retry, vflag;
+
+	vflag = 0;
+	if (opt_4)
+		vflag |= INP_IPV4;
+	if (opt_6)
+		vflag |= INP_IPV6;
+
+	switch (proto) {
+	case IPPROTO_TCP:
+		varname = "net.inet.tcp.pcblist";
+		protoname = "tcp";
+		break;
+	case IPPROTO_UDP:
+		varname = "net.inet.udp.pcblist";
+		protoname = "udp";
+		break;
+	default:
+		abort();
+	}
+
+	buf = NULL;
+	bufsize = 8192;
+	retry = 5;
+	do {
+		for (;;) {
+			if ((buf = realloc(buf, bufsize)) == NULL)
+				err(1, "realloc()");
+			len = bufsize;
+			if (sysctlbyname(varname, buf, &len, NULL, 0) == 0)
+				break;
+			if (errno != ENOMEM)
+				err(1, "sysctlbyname()");
+			bufsize *= 2;
+		}
+		xig = (struct xinpgen *)buf;
+		exig = (struct xinpgen *)((char *)buf + len - sizeof *exig);
+		if (xig->xig_len != sizeof *xig ||
+		    exig->xig_len != sizeof *exig)
+			errx(1, "struct xinpgen size mismatch");
+	} while (xig->xig_gen != exig->xig_gen && retry--);
+
+	if (xig->xig_gen != exig->xig_gen && opt_v)
+		warnx("warning: data may be inconsistent");
+
+	for (;;) {
+		xig = (struct xinpgen *)((char *)xig + xig->xig_len);
+		if (xig >= exig)
+			break;
+		switch (proto) {
+		case IPPROTO_TCP:
+			xtp = (struct xtcpcb *)xig;
+			if (xtp->xt_len != sizeof *xtp) {
+				warnx("struct xtcpcb size mismatch");
+				goto out;
+			}
+			inp = &xtp->xt_inp;
+			so = &xtp->xt_socket;
+			break;
+		case IPPROTO_UDP:
+			xip = (struct xinpcb *)xig;
+			if (xip->xi_len != sizeof *xip) {
+				warnx("struct xinpcb size mismatch");
+				goto out;
+			}
+			inp = &xip->xi_inp;
+			so = &xip->xi_socket;
+			break;
+		default:
+			abort();
+		}
+		if ((inp->inp_vflag & vflag) == 0)
+			continue;
+		if ((sock = calloc(1, sizeof *sock)) == NULL)
+			err(1, "malloc()");
+		sock->socket = so->xso_so;
+		sock->proto = proto;
+		if (inp->inp_vflag & INP_IPV4) {
+			sock->family = AF_INET;
+			sockaddr(&sock->laddr, sock->family,
+			    &inp->inp_laddr, inp->inp_lport);
+			sockaddr(&sock->faddr, sock->family,
+			    &inp->inp_faddr, inp->inp_fport);
+		} else if (inp->inp_vflag & INP_IPV6) {
+			sock->family = AF_INET6;
+			sockaddr(&sock->laddr, sock->family,
+			    &inp->in6p_laddr, inp->in6p_lport);
+			sockaddr(&sock->faddr, sock->family,
+			    &inp->in6p_faddr, inp->in6p_fport);
+		} else {
+			if (opt_v)
+				warnx("invalid vflag 0x%x", inp->inp_vflag);
+			free(sock);
+			continue;
+		}
+		sock->vflag = inp->inp_vflag;
+		sock->protoname = protoname;
+		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
+		sock->next = sockhash[hash];
+		sockhash[hash] = sock;
+	}
+out:
+	free(buf);
+}
+
+static void
+gather_unix(int proto)
+{
+	struct xunpgen *xug, *exug;
+	struct xunpcb *xup;
+	struct sock *sock;
+	const char *varname, *protoname;
+	size_t len, bufsize;
+	void *buf;
+	int hash, retry;
+
+	switch (proto) {
+	case SOCK_STREAM:
+		varname = "net.local.stream.pcblist";
+		protoname = "stream";
+		break;
+	case SOCK_DGRAM:
+		varname = "net.local.dgram.pcblist";
+		protoname = "dgram";
+		break;
+	default:
+		abort();
+	}
+	buf = NULL;
+	bufsize = 8192;
+	retry = 5;
+	do {
+		for (;;) {
+			if ((buf = realloc(buf, bufsize)) == NULL)
+				err(1, "realloc()");
+			len = bufsize;
+			if (sysctlbyname(varname, buf, &len, NULL, 0) == 0)
+				break;
+			if (errno != ENOMEM)
+				err(1, "sysctlbyname()");
+			bufsize *= 2;
+		}
+		xug = (struct xunpgen *)buf;
+		exug = (struct xunpgen *)((char *)buf + len - sizeof *exug);
+		if (xug->xug_len != sizeof *xug ||
+		    exug->xug_len != sizeof *exug) {
+			warnx("struct xinpgen size mismatch");
+			goto out;
+		}
+	} while (xug->xug_gen != exug->xug_gen && retry--);
+
+	if (xug->xug_gen != exug->xug_gen && opt_v)
+		warnx("warning: data may be inconsistent");
+
+	for (;;) {
+		xug = (struct xunpgen *)((char *)xug + xug->xug_len);
+		if (xug >= exug)
+			break;
+		xup = (struct xunpcb *)xug;
+		if (xup->xu_len != sizeof *xup) {
+			warnx("struct xunpcb size mismatch");
+			goto out;
+		}
+		if ((sock = calloc(1, sizeof *sock)) == NULL)
+			err(1, "malloc()");
+		sock->socket = xup->xu_socket.xso_so;
+		sock->pcb = xup->xu_unpp;
+		sock->proto = proto;
+		sock->family = AF_UNIX;
+		sock->protoname = protoname;
+		if (xup->xu_unp.unp_addr != NULL)
+			sock->laddr = *(struct sockaddr_storage *)&xup->xu_addr;
+		else if (xup->xu_unp.unp_conn != NULL)
+			*(void **)&sock->faddr = xup->xu_unp.unp_conn;
+		hash = (int)((uintptr_t)sock->socket % HASHSIZE);
+		sock->next = sockhash[hash];
+		sockhash[hash] = sock;
+	}
+out:
+	free(buf);
+}
+
+static void
+getfiles(void)
+{
+	size_t len;
+
+	if ((xfiles = malloc(len = sizeof *xfiles)) == NULL)
+		err(1, "malloc()");
+	while (sysctlbyname("kern.file", xfiles, &len, 0, 0) == -1) {
+		if (errno != ENOMEM)
+			err(1, "sysctlbyname()");
+		len *= 2;
+		if ((xfiles = realloc(xfiles, len)) == NULL)
+			err(1, "realloc()");
+	}
+	if (len > 0 && xfiles->xf_size != sizeof *xfiles)
+		errx(1, "struct xfile size mismatch");
+	nxfiles = len / sizeof *xfiles;
+}
+
+static int
+printaddr(int af, struct sockaddr_storage *ss)
+{
+	char addrstr[INET6_ADDRSTRLEN] = { '\0', '\0' };
+	struct sockaddr_un *sun;
+	void *addr;
+	int off, port;
+
+	switch (af) {
+	case AF_INET:
+		addr = &((struct sockaddr_in *)ss)->sin_addr;
+		if (inet_lnaof(*(struct in_addr *)addr) == INADDR_ANY)
+			addrstr[0] = '*';
+		port = ntohs(((struct sockaddr_in *)ss)->sin_port);
+		break;
+	case AF_INET6:
+		addr = &((struct sockaddr_in6 *)ss)->sin6_addr;
+		if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)addr))
+			addrstr[0] = '*';
+		port = ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
+		break;
+	case AF_UNIX:
+		sun = (struct sockaddr_un *)ss;
+		off = (int)((char *)&sun->sun_path - (char *)sun);
+		return (xprintf("%.*s", sun->sun_len - off, sun->sun_path));
+	}
+	if (addrstr[0] == '\0')
+		inet_ntop(af, addr, addrstr, sizeof addrstr);
+	if (port == 0)
+		return xprintf("%s:*", addrstr);
+	else
+		return xprintf("%s:%d", addrstr, port);
+}
+
+static const char *
+getprocname(pid_t pid)
+{
+	static struct kinfo_proc proc;
+	size_t len;
+	int mib[4];
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_PID;
+	mib[3] = (int)pid;
+	len = sizeof proc;
+	if (sysctl(mib, 4, &proc, &len, NULL, 0) == -1) {
+		warn("sysctl()");
+		return ("??");
+	}
+	return (proc.ki_ocomm);
+}
+
+static void
+display(void)
+{
+	struct passwd *pwd;
+	struct xfile *xf;
+	struct sock *s;
+	void *p;
+	int hash, n, pos;
+
+	printf("%-8s %-10s %-5s %-2s %-6s %-21s %-21s\n",
+	    "USER", "COMMAND", "PID", "FD", "PROTO",
+	    "LOCAL ADDRESS", "FOREIGN ADDRESS");
+	setpassent(1);
+	for (xf = xfiles, n = 0; n < nxfiles; ++n, ++xf) {
+		hash = (int)((uintptr_t)xf->xf_data % HASHSIZE);
+		/*xprintf("%p %d\n", xf->xf_data, hash);*/
+		for (s = sockhash[hash]; s != NULL; s = s->next)
+			if (s->socket == xf->xf_data)
+				break;
+		if (s == NULL)
+			continue;
+		pos = 0;
+		if ((pwd = getpwuid(xf->xf_uid)) == NULL)
+			pos += xprintf("%lu", (u_long)xf->xf_uid);
+		else
+			pos += xprintf("%s", pwd->pw_name);
+		while (pos < 9)
+			pos += xprintf(" ");
+		pos += xprintf("%.10s", getprocname(xf->xf_pid));
+		while (pos < 20)
+			pos += xprintf(" ");
+		pos += xprintf("%lu", (u_long)xf->xf_pid);
+		while (pos < 26)
+			pos += xprintf(" ");
+		pos += xprintf("%d", xf->xf_fd);
+		while (pos < 29)
+			pos += xprintf(" ");
+		pos += xprintf("%s", s->protoname);
+		if (s->vflag & INP_IPV4)
+			pos += xprintf("4");
+		if (s->vflag & INP_IPV6)
+			pos += xprintf("6");
+		while (pos < 36)
+			pos += xprintf(" ");
+		switch (s->family) {
+		case AF_INET:
+		case AF_INET6:
+			pos += printaddr(s->family, &s->laddr);
+			while (pos < 58)
+				pos += xprintf(" ");
+			pos += printaddr(s->family, &s->faddr);
+			break;
+		case AF_UNIX:
+			/* server */
+			if (s->laddr.ss_len > 0) {
+				pos += printaddr(s->family, &s->laddr);
+				break;
+			}
+			/* client */
+			pos += xprintf("-> ");
+			p = *(void **)&s->faddr;
+			for (hash = 0; hash < HASHSIZE; ++hash) {
+				for (s = sockhash[hash]; s != NULL; s = s->next)
+					if (s->pcb == p)
+						break;
+				if (s != NULL)
+					break;
+			}
+			if (s == NULL || s->laddr.ss_len == 0)
+				pos += xprintf("??");
+			else
+				pos += printaddr(s->family, &s->laddr);
+			break;
+		default:
+			abort();
+		}
+		xprintf("\n");
+	}
+}
+
+static void
+usage(void)
+{
+	fprintf(stderr, "Usage: sockstat [-46clu] [-p ports]\n");
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int o;
+
+	while ((o = getopt(argc, argv, "46clp:uv")) != -1)
+		switch (o) {
+		case '4':
+			opt_4 = 1;
+			break;
+		case '6':
+			opt_6 = 1;
+			break;
+		case 'c':
+			opt_c = 1;
+			break;
+		case 'l':
+			opt_l = 1;
+			break;
+		case 'p':
+			parse_ports(optarg);
+			break;
+		case 'u':
+			opt_u = 1;
+			break;
+		case 'v':
+			++opt_v;
+			break;
+		default:
+			usage();
+		}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc > 0)
+		usage();
+
+	if (!opt_4 && !opt_6 && !opt_u)
+		opt_4 = opt_6 = opt_u = 1;
+	if (!opt_c && !opt_l)
+		opt_c = opt_l = 1;
+
+	if (opt_4 || opt_6) {
+		gather_inet(IPPROTO_TCP);
+		gather_inet(IPPROTO_UDP);
+	}
+	if (opt_u) {
+		gather_unix(SOCK_STREAM);
+		gather_unix(SOCK_DGRAM);
+	}
+	getfiles();
+	display();
+
+	exit(0);
+}

usr.bin/sockstat/sockstat.pl

@@ -1,246 +0,0 @@
-#!/usr/bin/perl -w
-#-
-# Copyright (c) 1999 Dag-Erling Coïdan Smørgrav
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer
-#    in this position and unchanged.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in the
-#    documentation and/or other materials provided with the distribution.
-# 3. The name of the author may not be used to endorse or promote products
-#    derived from this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#
-# $FreeBSD$
-#
-
-use strict;
-use Getopt::Std;
-
-my %netstat;
-my %fstat;
-my $unknown = [ "?", "?", "?", "?", "?", "?", "?", "?", "?" ];
-
-my $inet_fmt = "%-8.8s %-8.8s %5.5s %4.4s %-6.6s %-21.21s %-21.21s\n";
-my $unix_fmt = "%-8.8s %-8.8s %5.5s %4.4s %-6.6s %-43.43s\n";
-
-my @ranges;
-
-#
-# Parse a port range specification
-#
-sub parse_port_ranges($) {
-    my $spec = shift;		# Range spec
-
-    my $range;			# Range
-    my ($low, $high);		# Low/high ends of range
-
-    foreach $range (split(/\s*,\s*/, $spec)) {
-	if ($range =~ m/^(\d+)-(\d+)$/) {
-	    ($low, $high) = ($1, $2);
-	} elsif ($range =~ m/^-(\d+)$/) {
-	    ($low, $high) = (1, $1);
-	} elsif ($range =~ m/^(\d+)-$/) {
-	    ($low, $high) = ($1, 65535);
-	} elsif ($range =~ m/^(\d+)$/) {
-	    $low = $high = $1;
-	} else {
-	    die("invalid range specification: $range\n");
-	}
-	if ($low < 0 || $low > 65535 || $high < 0 || $high > 65535) {
-	    die("valid ports numbers are 1-65535 inclusive\n");
-	}
-	if ($low > $high) {
-	    $low ^= $high;
-	    $high ^= $low;
-	    $low ^= $high;
-	}
-	push(@ranges, [ $low, $high ]);
-    }
-}
-
-#
-# Check if a port is in an allowed range
-#
-sub check_range($) {
-    my $addr = shift;		# Address to check
-
-    my $port;			# Port number
-    my $range;			# Range
-    
-    if (@ranges == 0) {
-	return 1;
-    }
-
-    if ($addr !~ m/\.(\d+)$/) {
-	return undef;
-    }
-    $port = $1;
-
-    foreach $range (@ranges) {
-	if ($port >= $range->[0] && $port <= $range->[1]) {
-	    return 1;
-	}
-    }
-    return undef;
-}
-
-#
-# Gather information about sockets
-#
-sub gather() {
-    
-    local *PIPE;		# Pipe
-    my $pid;			# Child PID
-    my $line;			# Input line
-    my @fields;			# Fields
-
-    # Netstat
-    if (!defined($pid = open(PIPE, "-|"))) {
-	die("open(netstat): $!\n");
-    } elsif ($pid == 0) {
-	exec("/usr/bin/netstat", "-AanW");
-	die("exec(netstat): $!\n");
-    }
-    while ($line = <PIPE>) {
-	next unless ($line =~ m/^[0-9a-f]{8} /) || ($line =~ m/^[0-9a-f]{16} /);
-	chomp($line);
-	@fields = split(' ', $line);
-	$netstat{$fields[0]} = [ @fields ];
-    }
-    close(PIPE)
-	or die("close(netstat): $!\n");
-
-    # Fstat
-    if (!defined($pid = open(PIPE, "-|"))) {
-	die("open(fstat): $!\n");
-    } elsif ($pid == 0) {
-	exec("/usr/bin/fstat");
-	die("exec(fstat): $!\n");
-    }
-    while ($line = <PIPE>) {
-	chomp($line);
-	@fields = split(' ', $line);
-	next if ($fields[4] eq "-");
-	push(@{$fstat{$fields[4]}}, [ @fields ]);
-    }
-    close(PIPE)
-	or die("close(fstat): $!\n");
-}
-
-#
-# Replace the last dot in an "address.port" string with a colon
-#
-sub addr($) {
-    my $addr = shift;		# Address
-
-    $addr =~ s/^(.*)\.([^\.]*)$/$1:$2/;
-    return $addr;
-}
-
-#
-# Print information about Internet sockets
-#
-sub print_inet($$$) {
-    my $af = shift;		# Address family
-    my $conn = shift || 0;	# Show connected sockets
-    my $listen = shift || 0;	# Show listen sockets
-
-    my $fsd;			# Fstat data
-    my $nsd;			# Netstat data
-
-    printf($inet_fmt, "USER", "COMMAND", "PID", "FD",
-	   "PROTO", "LOCAL ADDRESS", "FOREIGN ADDRESS");
-    foreach $fsd (@{$fstat{$af}}) {
-	next unless defined($fsd->[7]);
-	$nsd = $netstat{$fsd->[7]} || $unknown;
-	next unless (check_range($nsd->[4]) || check_range($nsd->[5]));
-	next if (!$conn && $nsd->[5] ne '*.*');
-	next if (!$listen && $nsd->[5] eq '*.*');
-	printf($inet_fmt, $fsd->[0], $fsd->[1], $fsd->[2],
-	       substr($fsd->[3], 0, -1),
-	       $nsd->[1], addr($nsd->[4]), addr($nsd->[5]));
-    }
-    print("\n");
-}
-
-#
-# Print information about Unix domain sockets
-#
-sub print_unix($$) {
-    my $conn = shift || 0;	# Show connected sockets
-    my $listen = shift || 0;	# Show listen sockets
-
-    my %endpoint;		# Mad PCB to process/fd
-    my $fsd;			# Fstat data
-    my $nsd;			# Netstat data
-
-    foreach $fsd (@{$fstat{"local"}}) {
-	$endpoint{$fsd->[6]} = "$fsd->[1]\[$fsd->[2]\]:" .
-	    substr($fsd->[3], 0, -1);
-    }
-    printf($unix_fmt, "USER", "COMMAND", "PID", "FD", "PROTO", "ADDRESS");
-    foreach $fsd (@{$fstat{"local"}}) {
-	next unless defined($fsd->[6]);
-	next if (!$conn && defined($fsd->[8]));
-	next if (!$listen && !defined($fsd->[8]));
-	$nsd = $netstat{$fsd->[6]} || $unknown;
-	printf($unix_fmt, $fsd->[0], $fsd->[1], $fsd->[2],
-	       substr($fsd->[3], 0, -1), $fsd->[5],
-	       $nsd->[8] || ($fsd->[8] ? $endpoint{$fsd->[8]} : "(none)"));
-    }
-    print("\n");
-}
-
-#
-# Print usage message and exit
-#
-sub usage() {
-    print(STDERR "usage: sockstat [-46clu] [-p ports]\n");
-    exit(1);
-}
-
-MAIN:{
-    my %opts;			# Command-line options
-
-    getopts("46clp:u", \%opts)
-	or usage();
-
-    gather();
-
-    if (!$opts{'4'} && !$opts{'6'} && !$opts{'u'}) {
-	$opts{'4'} = $opts{'6'} = $opts{'u'} = 1;
-    }
-    if (!$opts{'c'} && !$opts{'l'}) {
-	$opts{'c'} = $opts{'l'} = 1;
-    }
-    if ($opts{'p'}) {
-	parse_port_ranges($opts{'p'});
-    }
-    if ($opts{'4'}) {
-	print_inet("internet", $opts{'c'}, $opts{'l'});
-    }
-    if ($opts{'6'}) {
-	print_inet("internet6", $opts{'c'}, $opts{'l'});
-    }
-    if ($opts{'u'}) {
-	print_unix($opts{'c'}, $opts{'l'});
-    }
-    
-    exit(0);
-}