GEOM Gate network daemon.

svn path=/head/; revision=128766

sbin/ggate/ggated/Makefile

@@ -0,0 +1,12 @@
+# $FreeBSD$
+
+.PATH:	../shared
+
+BINDIR=	/sbin
+PROG=	ggated
+SRCS=	ggated.c ggate.c
+MAN=	ggated.8
+WARNS=	6
+CFLAGS+=-I../shared
+
+.include <bsd.prog.mk>

sbin/ggate/ggated/ggated.8

@@ -0,0 +1,113 @@
+.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+.\" 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.
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd April 29, 2004
+.Dt GGATED 8
+.Os
+.Sh NAME
+.Nm ggated
+.Nd "GEOM Gate network daemon"
+.Sh SYNOPSIS
+.Nm
+.Op Fl h
+.Op Fl n
+.Op Fl v
+.Op Fl a Ar address
+.Op Fl p Ar port
+.Op Fl R Ar rcvbuf
+.Op Fl S Ar sndbuf
+.Op Ar "exports file"
+.Sh DESCRIPTION
+The
+.Nm
+utility is a network server for GEOM Gate class.
+It runs on a server machine to service GEOM Gate requests from workers
+placed on a client machine.
+Keep in mind, that connection between
+.Nm ggatec
+and
+.Nm ggated
+is not encrypted.
+.Pp
+Available options:
+.Bl -tag -width ".Ar exports file"
+.It Fl a Ar address
+Specifies an IP address to bind to.
+.It Fl h
+Print available options.
+.It Fl n
+Do not use TCP_NODELAY option on TCP sockets.
+.It Fl p Ar port
+Port on which
+.Nm
+listens for connection. Default is 3080.
+.It Fl R Ar rcvbuf
+Size of receive buffer to use.
+Default is 131072 (128kB).
+.It Fl S Ar sndbuf
+Size of send buffer to use.
+Default is 131072 (128kB).
+.It Fl v
+Do not fork, run in foreground and print debug informations on standard
+output.
+.It Ar "exports file"
+An alternate location for the exports file.
+.El
+.Pp
+The format of an exports file is as follows:
+.Bd -literal -offset indent
+1.2.3.4		RO	/dev/acd0
+1.2.3.0/24	RW	/tmp/test.img
+hostname	WO	/tmp/image
+.Ed
+.Pp
+.Sh EXAMPLES
+Export CD\-ROM device and a file:
+.Pp
+.Bd -literal -offset indent
+# echo "1.2.3.0/24 RO /dev/acd0" > /etc/gg.exports
+# echo "client RW /image" >> /etc/gg.exports
+# ggated
+.Ed
+.Pp
+.Sh DIAGNOSTICS
+Exit status is 0 on success, or 1 if the command fails.
+To get details about the failure,
+.Nm
+should be called with the
+.Fl v
+option.
+.Sh SEE ALSO
+.Xr geom 4 ,
+.Xr ggatec 8 ,
+.Xr ggatel 8
+.Sh AUTHORS
+The
+.Nm
+utility as well as this manual page was written by
+.An -split
+.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org .
+.An -nosplit

sbin/ggate/ggated/ggated.c

@@ -0,0 +1,649 @@
+/*-
+ * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * 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.
+ * 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.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/param.h>
+#include <sys/queue.h>
+#include <sys/endian.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/disk.h>
+#include <sys/bio.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <signal.h>
+#include <err.h>
+#include <errno.h>
+#include <string.h>
+#include <libgen.h>
+#include <syslog.h>
+#include <stdarg.h>
+
+#include <geom/gate/g_gate.h>
+#include "ggate.h"
+
+
+#define	G_GATED_EXPORT_FILE	"/etc/gg.exports"
+#define	G_GATED_DEBUG(...)						\
+	if (g_gate_verbose) {						\
+		printf(__VA_ARGS__);					\
+		printf("\n");						\
+	}
+
+static const char *exports = G_GATED_EXPORT_FILE;
+static int got_sighup = 0;
+static int nagle = 1;
+static unsigned rcvbuf = G_GATE_RCVBUF;
+static unsigned sndbuf = G_GATE_SNDBUF;
+
+struct export {
+	char		*e_path;	/* path to device/file */
+	in_addr_t	 e_ip;		/* remote IP address */
+	in_addr_t	 e_mask;	/* IP mask */
+	unsigned	 e_flags;	/* flags (RO/RW) */
+	SLIST_ENTRY(export) e_next;
+};
+static SLIST_HEAD(, export) exports_list =
+    SLIST_HEAD_INITIALIZER(&exports_list);
+
+static void
+usage(void)
+{
+
+	fprintf(stderr, "usage: %s [-nv] [-a address] [-p port] [-R rcvbuf] "
+	    "[-S sndbuf] [exports file]\n", getprogname());
+	exit(EXIT_FAILURE);
+}
+
+static char *
+ip2str(in_addr_t ip)
+{
+	static char sip[16];
+
+	snprintf(sip, sizeof(sip), "%u.%u.%u.%u",
+	    ((ip >> 24) & 0xff),
+	    ((ip >> 16) & 0xff),
+	    ((ip >> 8) & 0xff),
+	    (ip & 0xff));
+	return (sip);
+}
+
+static in_addr_t
+countmask(unsigned m)
+{
+	in_addr_t mask;
+
+	if (m == 0) {
+		mask = 0x0;
+	} else {
+		mask = 1 << (32 - m);
+		mask--;
+		mask = ~mask;
+	}
+	return (mask);
+}
+
+static void
+line_parse(char *line, unsigned lineno)
+{
+	struct export *ex;
+	char *word, *path, *sflags;
+	unsigned flags, i, vmask;
+	in_addr_t ip, mask;
+
+	ip = mask = flags = vmask = 0;
+	path = NULL;
+	sflags = NULL;
+
+	for (i = 0, word = strtok(line, " \t"); word != NULL;
+	    i++, word = strtok(NULL, " \t")) {
+		switch (i) {
+		case 0: /* IP address or host name */
+			ip = g_gate_str2ip(strsep(&word, "/"));
+			if (ip == INADDR_NONE) {
+				g_gate_xlog("Invalid IP/host name at line %u.",
+				    lineno);
+			}
+			ip = ntohl(ip);
+			if (word == NULL)
+				vmask = 32;
+			else {
+				errno = 0;
+				vmask = strtoul(word, NULL, 10);
+				if (vmask == 0 && errno != 0) {
+					g_gate_xlog("Invalid IP mask value at "
+					    "line %u.", lineno);
+				}
+				if ((unsigned)vmask > 32) {
+					g_gate_xlog("Invalid IP mask value at line %u.",
+					    lineno);
+				}
+			}
+			mask = countmask(vmask);
+			break;
+		case 1:	/* flags */
+			if (strcasecmp("rd", word) == 0 ||
+			    strcasecmp("ro", word) == 0) {
+				flags = O_RDONLY;
+			} else if (strcasecmp("wo", word) == 0) {
+				flags = O_WRONLY;
+			} else if (strcasecmp("rw", word) == 0) {
+				flags = O_RDWR;
+			} else {
+				g_gate_xlog("Invalid value in flags field at "
+				    "line %u.", lineno);
+			}
+			sflags = word;
+			break;
+		case 2:	/* path */
+			if (strlen(word) >= MAXPATHLEN) {
+				g_gate_xlog("Path too long at line %u. ",
+				    lineno);
+			}
+			path = word;
+			break;
+		default:
+			g_gate_xlog("Too many arguments at line %u. ", lineno);
+		}
+	}
+	if (i != 3)
+		g_gate_xlog("Too few arguments at line %u.", lineno);
+
+	ex = malloc(sizeof(*ex));
+	if (ex == NULL)
+		g_gate_xlog("No enough memory.");
+	ex->e_path = strdup(path);
+	if (ex->e_path == NULL)
+		g_gate_xlog("No enough memory.");
+
+	/* Made 'and' here. */
+	ex->e_ip = (ip & mask);
+	ex->e_mask = mask;
+	ex->e_flags = flags;
+
+	SLIST_INSERT_HEAD(&exports_list, ex, e_next);
+
+	g_gate_log(LOG_DEBUG, "Added %s/%u %s %s to exports list.",
+	    ip2str(ex->e_ip), vmask, path, sflags);
+}
+
+static void
+exports_clear(void)
+{
+	struct export *ex;
+
+	while (!SLIST_EMPTY(&exports_list)) {
+		ex = SLIST_FIRST(&exports_list);
+		SLIST_REMOVE_HEAD(&exports_list, e_next);
+		free(ex);
+	}
+}
+
+#define	EXPORTS_LINE_SIZE	2048
+static void
+exports_get(void)
+{
+	char buf[EXPORTS_LINE_SIZE], *line;
+	unsigned lineno = 0, objs = 0, len;
+	FILE *fd;
+
+	exports_clear();
+
+	fd = fopen(exports, "r");
+	if (fd == NULL) {
+		g_gate_xlog("Cannot open exports file (%s): %s.", exports,
+		    strerror(errno));
+	}
+
+	g_gate_log(LOG_INFO, "Reading exports file (%s).", exports);
+
+	for (;;) {
+		if (fgets(buf, sizeof(buf), fd) == NULL) {
+			if (feof(fd))
+				break;
+
+			g_gate_xlog("Error while reading exports file: %s.",
+			    strerror(errno));
+		}
+
+		/* Increase line count. */
+		lineno++;
+
+		/* Skip spaces and tabs. */
+		for (line = buf; *line == ' ' || *line == '\t'; ++line)
+			;
+
+		/* Empty line, comment or empty line at the end of file. */
+		if (*line == '\n' || *line == '#' || *line == '\0')
+			continue;
+
+		len = strlen(line);
+		if (line[len - 1] == '\n') {
+			/* Remove new line char. */
+			line[len - 1] = '\0';
+		} else {
+			if (!feof(fd))
+				g_gate_xlog("Line %u too long.", lineno);
+		}
+
+		line_parse(line, lineno);
+		objs++;
+	}
+
+	fclose(fd);
+
+	if (objs == 0)
+		g_gate_xlog("There are no objects to export.");
+
+	g_gate_log(LOG_INFO, "Exporting %u object(s).", objs);
+}
+
+static struct export *
+exports_find(struct sockaddr *s, const char *path)
+{
+	struct export *ex;
+	in_addr_t ip;
+
+	ip = htonl(((struct sockaddr_in *)s)->sin_addr.s_addr);
+	SLIST_FOREACH(ex, &exports_list, e_next) {
+		if ((ip & ex->e_mask) != ex->e_ip)
+			continue;
+		if (path != NULL && strcmp(path, ex->e_path) != 0)
+			continue;
+
+		g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip));
+		return (ex);
+	}
+	g_gate_log(LOG_INFO, "Unauthorized connection from: %s.", ip2str(ip));
+
+	return (NULL);
+}
+
+static void
+sendfail(int sfd, int error, const char *fmt, ...)
+{
+	struct g_gate_sinit sinit;
+	va_list ap;
+	int data;
+
+	sinit.gs_error = error;
+	g_gate_swap2n_sinit(&sinit);
+	data = send(sfd, &sinit, sizeof(sinit), 0);
+	g_gate_swap2h_sinit(&sinit);
+	if (data == -1) {
+		g_gate_xlog("Error while sending initial packet: %s.",
+		    strerror(errno));
+	}
+	if (fmt != NULL) {
+		va_start(ap, fmt);
+		g_gate_xvlog(fmt, ap);
+		/* NOTREACHED */
+		va_end(ap);
+	}
+	exit(EXIT_FAILURE);
+}
+
+static void
+serve(int sfd, struct sockaddr *s)
+{
+	struct g_gate_cinit cinit;
+	struct g_gate_sinit sinit;
+	struct g_gate_hdr hdr;
+	struct export *ex;
+	char ipmask[32]; /* 32 == strlen("xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx")+1 */
+	size_t bufsize;
+	int32_t error;
+	int fd, flags;
+	ssize_t data;
+	char *buf;
+
+	g_gate_log(LOG_DEBUG, "Receiving initial packet.");
+	data = recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL);
+	g_gate_swap2h_cinit(&cinit);
+	if (data == -1) {
+		g_gate_xlog("Error while receiving initial packet: %s.",
+		    strerror(errno));
+	}
+
+	ex = exports_find(s, cinit.gc_path);
+	if (ex == NULL) {
+		sendfail(sfd, EINVAL, "Requested path isn't exported: %s.",
+		    strerror(errno));
+	}
+
+	error = 0;
+	strlcpy(ipmask, ip2str(ex->e_ip), sizeof(ipmask));
+	strlcat(ipmask, "/", sizeof(ipmask));
+	strlcat(ipmask, ip2str(ex->e_mask), sizeof(ipmask));
+	if ((cinit.gc_flags & G_GATE_FLAG_READONLY) != 0) {
+		if (ex->e_flags == O_WRONLY) {
+			g_gate_log(LOG_ERR, "Read-only access requested, but "
+			    "%s (%s) is exported write-only.", ex->e_path,
+			    ipmask);
+			error = EPERM;
+		} else {
+			sinit.gs_flags = G_GATE_FLAG_READONLY;
+		}
+	} else if ((cinit.gc_flags & G_GATE_FLAG_WRITEONLY) != 0) {
+		if (ex->e_flags == O_RDONLY) {
+			g_gate_log(LOG_ERR, "Write-only access requested, but "
+			    "%s (%s) is exported read-only.", ex->e_path,
+			    ipmask);
+			error = EPERM;
+		} else {
+			sinit.gs_flags = G_GATE_FLAG_WRITEONLY;
+		}
+	} else {
+		if (ex->e_flags == O_RDONLY) {
+			g_gate_log(LOG_ERR, "Read-write access requested, but "
+			    "%s (%s) is exported read-only.", ex->e_path,
+			    ipmask);
+			error = EPERM;
+		} else if (ex->e_flags == O_WRONLY) {
+			g_gate_log(LOG_ERR, "Read-write access requested, but "
+			    "%s (%s) is exported write-only.", ex->e_path,
+			    ipmask);
+			error = EPERM;
+		} else {
+			sinit.gs_flags = 0;
+		}
+	}
+	if (error != 0)
+		sendfail(sfd, error, NULL);
+	flags = g_gate_openflags(sinit.gs_flags);;
+	fd = open(ex->e_path, flags);
+	if (fd < 0) {
+		sendfail(sfd, errno, "Error while opening %s: %s.", ex->e_path,
+		    strerror(errno));
+	}
+
+	g_gate_log(LOG_DEBUG, "Sending initial packet.");
+	/*
+	 * This field isn't used by ggc(8) for now.
+	 * It should be used in future when user don't give device size.
+	 */
+	sinit.gs_mediasize = g_gate_mediasize(fd);
+	sinit.gs_sectorsize = g_gate_sectorsize(fd);
+	sinit.gs_error = 0;
+	g_gate_swap2n_sinit(&sinit);
+	data = send(sfd, &sinit, sizeof(sinit), 0);
+	g_gate_swap2h_sinit(&sinit);
+	if (data == -1) {
+		sendfail(sfd, errno, "Error while sending initial packet: %s.",
+		    strerror(errno));
+	}
+
+	bufsize = G_GATE_BUFSIZE_START;
+	buf = malloc(bufsize);
+	if (buf == NULL)
+		g_gate_xlog("No enough memory.");
+
+	g_gate_log(LOG_DEBUG, "New process: %u.", getpid());
+
+	for (;;) {
+		/*
+		 * Receive request.
+		 */
+		data = recv(sfd, &hdr, sizeof(hdr), MSG_WAITALL);
+		if (data == 0) {
+			g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid());
+			exit(EXIT_SUCCESS);
+		} else if (data == -1) {
+			g_gate_xlog("Error while receiving hdr packet: %s.",
+			    strerror(errno));
+		} else if (data != sizeof(hdr)) {
+			g_gate_xlog("Malformed hdr packet received.");
+		}
+		g_gate_log(LOG_DEBUG, "Received hdr packet.");
+		g_gate_swap2h_hdr(&hdr);
+
+		/*
+		 * Increase buffer if there is need to.
+		 */
+		if (hdr.gh_length > bufsize) {
+			bufsize = hdr.gh_length;
+			g_gate_log(LOG_DEBUG, "Increasing buffer to %u.",
+			    bufsize);
+			buf = realloc(buf, bufsize);
+			if (buf == NULL)
+				g_gate_xlog("No enough memory.");
+		}
+
+		if (hdr.gh_cmd == BIO_READ) {
+			if (pread(fd, buf, hdr.gh_length,
+			    hdr.gh_offset) == -1) {
+				error = errno;
+				g_gate_log(LOG_ERR, "Error while reading data "
+				    "(offset=%ju, size=%zu): %s.",
+				    (uintmax_t)hdr.gh_offset,
+				    (size_t)hdr.gh_length, strerror(error));
+			} else {
+				error = 0;
+			}
+			hdr.gh_error = error;
+			g_gate_swap2n_hdr(&hdr);
+			if (send(sfd, &hdr, sizeof(hdr), 0) == -1) {
+				g_gate_xlog("Error while sending status: %s.",
+				    strerror(errno));
+			}
+			g_gate_swap2h_hdr(&hdr);
+			/* Send data only if there was no error while pread(). */
+			if (error == 0) {
+				data = send(sfd, buf, hdr.gh_length, 0);
+				if (data == -1) {
+					g_gate_xlog("Error while sending data: "
+					    "%s.", strerror(errno));
+				}
+				g_gate_log(LOG_DEBUG, "Sent %d bytes "
+				    "(offset=%ju, size=%zu).", data,
+				    (uintmax_t)hdr.gh_offset,
+				    (size_t)hdr.gh_length);
+			}
+		} else /* if (hdr.gh_cmd == BIO_WRITE) */ {
+			g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...",
+			    hdr.gh_length);
+			data = recv(sfd, buf, hdr.gh_length, MSG_WAITALL);
+			if (data == -1) {
+				g_gate_xlog("Error while receiving data: %s.",
+				    strerror(errno));
+			}
+			if (pwrite(fd, buf, hdr.gh_length, hdr.gh_offset) == -1) {
+				error = errno;
+				g_gate_log(LOG_ERR, "Error while writing data "
+				    "(offset=%llu, size=%u): %s.",
+				    hdr.gh_offset, hdr.gh_length,
+				    strerror(error));
+			} else {
+				error = 0;
+			}
+			hdr.gh_error = error;
+			g_gate_swap2n_hdr(&hdr);
+			if (send(sfd, &hdr, sizeof(hdr), 0) == -1) {
+				g_gate_xlog("Error while sending status: %s.",
+				    strerror(errno));
+			}
+			g_gate_swap2h_hdr(&hdr);
+			g_gate_log(LOG_DEBUG, "Received %d bytes (offset=%llu, "
+			    "size=%u).", data, hdr.gh_offset, hdr.gh_length);
+		}
+		g_gate_log(LOG_DEBUG, "Tick.");
+	}
+}
+
+static void
+huphandler(int sig __unused)
+{
+
+	got_sighup = 1;
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct sockaddr_in serv;
+	struct sockaddr from;
+	in_addr_t bindaddr;
+	socklen_t fromlen;
+	struct timeval tv;
+	int on, sfd, tmpsfd;
+	pid_t childpid;
+	unsigned bsize, port;
+
+	bindaddr = htonl(INADDR_ANY);
+	port = G_GATE_PORT;
+	for (;;) {
+		int ch;
+
+		ch = getopt(argc, argv, "a:hnp:R:S:v");
+		if (ch == -1)
+			break;
+		switch (ch) {
+		case 'a':
+			bindaddr = g_gate_str2ip(optarg);
+			if (bindaddr == INADDR_NONE) {
+				errx(EXIT_FAILURE,
+				    "Invalid IP/host name to bind to.");
+			}
+			break;
+		case 'n':
+			nagle = 0;
+			break;
+		case 'p':
+			errno = 0;
+			port = strtoul(optarg, NULL, 10);
+			if (port == 0 && errno != 0)
+				errx(EXIT_FAILURE, "Invalid port.");
+			break;
+		case 'R':
+			errno = 0;
+			rcvbuf = strtoul(optarg, NULL, 10);
+			if (rcvbuf == 0 && errno != 0)
+				errx(EXIT_FAILURE, "Invalid rcvbuf.");
+			break;
+		case 'S':
+			errno = 0;
+			sndbuf = strtoul(optarg, NULL, 10);
+			if (sndbuf == 0 && errno != 0)
+				errx(EXIT_FAILURE, "Invalid sndbuf.");
+			break;
+		case 'v':
+			g_gate_verbose++;
+			break;
+		case 'h':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argv[0] != NULL)
+		exports = argv[0];
+	exports_get();
+
+	if (!g_gate_verbose) {
+		/* Run in daemon mode. */
+		if (daemon(0, 0) < 0)
+			g_gate_xlog("Can't daemonize: %s", strerror(errno));
+	}
+
+	signal(SIGCHLD, SIG_IGN);
+
+	sfd = socket(AF_INET, SOCK_STREAM, 0);
+	if (sfd < 0)
+		g_gate_xlog("Can't open stream socket: %s.", strerror(errno));
+	bzero(&serv, sizeof(serv));
+	serv.sin_family = AF_INET;
+	serv.sin_addr.s_addr = bindaddr;
+	serv.sin_port = htons(port);
+	on = 1;
+	if (nagle) {
+		if (setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, &on, 
+		    sizeof(on)) < 0) {
+			g_gate_xlog("setsockopt() error: %s.", strerror(errno));
+		}
+	}
+	if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
+		g_gate_xlog("setsockopt(): %s.", strerror(errno));
+	bsize = rcvbuf;
+	if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, &bsize, sizeof(bsize)) < 0)
+		g_gate_xlog("setsockopt(): %s.", strerror(errno));
+	bsize = sndbuf;
+	if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, &bsize, sizeof(bsize)) < 0)
+		g_gate_xlog("setsockopt(): %s.", strerror(errno));
+	tv.tv_sec = 10;
+	tv.tv_usec = 0;
+	if (setsockopt(sfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) ||
+	    setsockopt(sfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
+		g_gate_xlog("setsockopt() error: %s.", strerror(errno));
+	}
+	if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) < 0)
+		g_gate_xlog("bind(): %s.", strerror(errno));
+	if (listen(sfd, 5) < 0)
+		g_gate_xlog("listen(): %s.", strerror(errno));
+
+	g_gate_log(LOG_INFO, "Listen on port: %d.", port);
+
+	signal(SIGHUP, huphandler);
+
+	for (;;) {
+		fromlen = sizeof(from);
+		tmpsfd = accept(sfd, &from, &fromlen);
+		if (tmpsfd < 0)
+			g_gate_xlog("accept(): %s.", strerror(errno));
+
+		if (got_sighup) {
+			got_sighup = 0;
+			exports_get();
+		}
+
+		if (exports_find(&from, NULL) == NULL) {
+			close(tmpsfd);
+			continue;
+		}
+
+		childpid = fork();
+		if (childpid < 0) {
+			g_gate_xlog("Cannot create child process: %s.",
+			    strerror(errno));
+		} else if (childpid == 0) {
+			close(sfd);
+			serve(tmpsfd, &from);
+			/* NOTREACHED */
+		}
+		close(tmpsfd);
+	}
+	close(sfd);
+	exit(EXIT_SUCCESS);
+}