hotplugd -- devices hot plugging monitor daemon.

The hotplugd daemon monitors the hotplug(4) pseudo-device, acting on
signaled events by executing the scripts in the /etc/hotplug directory.

Not linked to the build yet.

3 files changed, 301 insertions, 0 deletions

diff --git a/usr.sbin/hotplugd/Makefile b/usr.sbin/hotplugd/Makefile
new file mode 100644
index 00000000000..ae891b74bdf
--- /dev/null
+++ b/usr.sbin/hotplugd/Makefile
@@ -0,0 +1,12 @@
+# $OpenBSD: Makefile,v 1.1 2004/05/30 08:28:28 grange Exp $
+
+PROG=	hotplugd
+SRCS=	hotplugd.c
+MAN=	hotplugd.8
+
+CFLAGS+= -Wall
+CFLAGS+= -Wstrict-prototypes -Wmissing-prototypes
+CLFAGS+= -Wmissing-declarations -Wredundant-decls
+CFLAGS+= -Wshadow -Wpointer-arith -Wcast-qual
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/hotplugd/hotplugd.8 b/usr.sbin/hotplugd/hotplugd.8
new file mode 100644
index 00000000000..fd400566bdc
--- /dev/null
+++ b/usr.sbin/hotplugd/hotplugd.8
@@ -0,0 +1,126 @@
+.\"	$OpenBSD: hotplugd.8,v 1.1 2004/05/30 08:28:28 grange Exp $
+.\"
+.\" Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd March 30, 2004
+.Dt HOTPLUGD 8
+.Os
+.Sh NAME
+.Nm hotplugd
+.Nd devices hot plugging monitor daemon
+.Sh SYNOPSIS
+.Nm hotplugd
+.Op Fl d Ar device
+.Sh DESCRIPTION
+The
+.Nm
+daemon monitors the
+.Xr hotplug 4
+pseudo-device, acting on signaled events by executing the scripts in the
+.Pa /etc/hotplug
+directory.
+By default it uses the
+.Pa /dev/hotplug
+device for reading events from, but an alternative device can be
+specified with the
+.Fl d
+option.
+Actions can be configured either for device attachment or detachment.
+On device attachment the
+.Pa attach
+script is executed if it exists.
+On device detachment the
+.Pa detach
+script is executed if it exists.
+In both cases two parameters are passed to the scripts: the class and name
+of the attached or detached device.
+Device class corresponds to the classes described in the
+.Aq Pa sys/device.h
+header file and can be one of the following:
+.Bl -tag -width Ds
+.It 0
+generic, no special info
+.It 1
+CPU (carries resource utilization)
+.It 2
+disk drive
+.It 3
+network interface
+.It 4
+tape device
+.It 5
+serial line interface
+.El
+.Pp
+Not all classes can be really usable, e.g. it's unlikely to have
+a hot plug CPU.
+.Pp
+Device name is a usual name including unit number, e.g.\&
+.Pa sd1 .
+.Sh FILES
+.Bl -tag -width "/dev/hotplug/attach" -compact
+.It /dev/hotplug
+Pseudo-device file.
+.It /etc/hotplug
+Directory where the scripts to execute are located.
+.It /etc/hotplug/attach
+Script to execute on device attachment.
+.It /etc/hotplug/detach
+Script to execute on device detachment.
+.El
+.Sh EXAMPLES
+Sample
+.Pa attach
+script:
+.Bd -literal -offset indent
+#!/bin/sh
+
+DEVCLASS=$1
+DEVNAME=$2
+
+case $DEVCLASS in
+2)
+	# disk devices
+
+	disklabel=`/sbin/disklabel $DEVNAME | grep '^label:' | \e
+	    sed -e 's/^label: //'`
+	case $disklabel in
+	Sony*DSC*)
+		# Sony DSC camera
+		mount /dev/"$DEVNAME"i /mnt/camera
+		;;
+	esac
+
+	;;
+3)
+	# network devices
+
+	/sbin/dhclient $DEVNAME
+
+	;;
+esac
+.Ed
+.Sh SEE ALSO
+.Xr hotplug 4
+.Sh HISTORY
+The
+.Nm
+program first appeared in
+.Ox 3.6 .
+.Sh AUTHORS
+The
+.Nm
+program was written by
+.An Alexander Yurchenko Aq grange@openbsd.org .
diff --git a/usr.sbin/hotplugd/hotplugd.c b/usr.sbin/hotplugd/hotplugd.c
new file mode 100644
index 00000000000..2f18d7b9159
--- /dev/null
+++ b/usr.sbin/hotplugd/hotplugd.c
@@ -0,0 +1,163 @@
+/*	$OpenBSD: hotplugd.c,v 1.1 2004/05/30 08:28:28 grange Exp $	*/
+/*
+ * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Devices hot plugging daemon.
+ */
+
+#include <sys/types.h>
+#include <sys/device.h>
+#include <sys/hotplug.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+
+#define _PATH_DEV_HOTPLUG		"/dev/hotplug"
+#define _PATH_ETC_HOTPLUG		"/etc/hotplug"
+#define _PATH_ETC_HOTPLUG_ATTACH	_PATH_ETC_HOTPLUG "/attach"
+#define _PATH_ETC_HOTPLUG_DETACH	_PATH_ETC_HOTPLUG "/detach"
+
+volatile sig_atomic_t quit = 0;
+char *device = _PATH_DEV_HOTPLUG;
+int devfd = -1;
+
+void exec_script(const char *, int, char *);
+
+void sigquit(int);
+__dead void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	int ch;
+	struct sigaction sact;
+	struct hotplug_event he;
+
+	while ((ch = getopt(argc, argv, "d:")) != -1)
+		switch (ch) {
+		case 'd':
+			device = optarg;
+			break;
+		case '?':
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+
+	if ((devfd = open(device, O_RDONLY)) == -1)
+		err(1, "%s", device);
+
+	bzero(&sact, sizeof(sact));
+	sigemptyset(&sact.sa_mask);
+	sact.sa_flags = 0;
+	sact.sa_handler = sigquit;
+	sigaction(SIGINT, &sact, NULL);
+	sigaction(SIGQUIT, &sact, NULL);
+	sigaction(SIGTERM, &sact, NULL);
+	sact.sa_handler = SIG_IGN;
+	sigaction(SIGHUP, &sact, NULL);
+
+	openlog("hotplugd", LOG_NDELAY | LOG_PID, LOG_DAEMON);
+	if (daemon(0, 0) == -1)
+		err(1, "daemon");
+
+	syslog(LOG_INFO, "started");
+
+	while (!quit) {
+		if (read(devfd, &he, sizeof(he)) == -1) {
+			if (errno == EINTR)
+				/* ignore */
+				continue;
+			syslog(LOG_ERR, "read: %m");
+			exit(1);
+		}
+
+		switch (he.he_type) {
+		case HOTPLUG_DEVAT:
+			syslog(LOG_INFO, "%s attached, class %d",
+			    he.he_devname, he.he_devclass);
+			exec_script(_PATH_ETC_HOTPLUG_ATTACH, he.he_devclass,
+			    he.he_devname);
+			break;
+		case HOTPLUG_DEVDT:
+			syslog(LOG_INFO, "%s detached, class %d",
+			    he.he_devname, he.he_devclass);
+			exec_script(_PATH_ETC_HOTPLUG_DETACH, he.he_devclass,
+			    he.he_devname);
+			break;
+		default:
+			syslog(LOG_NOTICE, "unknown event (0x%x)", he.he_type);
+		}
+	}
+
+	syslog(LOG_INFO, "terminated");
+
+	closelog();
+	close(devfd);
+
+	return (0);
+}
+
+void
+exec_script(const char *file, int class, char *name)
+{
+	char strclass[8];
+	pid_t pid;
+
+	snprintf(strclass, sizeof(strclass), "%d", class);
+
+	if (access(file, X_OK | R_OK))
+		/* do nothing if file can't be accessed */
+		return;
+
+	if ((pid = fork()) == -1) {
+		syslog(LOG_ERR, "fork: %m");
+		return;
+	}
+	if (pid == 0) {
+		/* child process */
+		execl(file, basename(file), strclass, name, (char *)NULL);
+		syslog(LOG_ERR, "execl: %m");
+		_exit(1);
+		/* NOTREACHED */
+	}
+}
+
+void
+sigquit(int signum)
+{
+	quit = 1;
+}
+
+__dead void
+usage(void)
+{
+	extern char *__progname;
+
+	fprintf(stderr, "usage: %s [-d device]\n", __progname);
+	exit(1);
+}