devd. A daemon that hooks into the kernel's /dev/devctl to produce

arbitrary commands when devices come and go in the device tree (which is
different than the /dev directory).

This is an initial version.  Much of the planned power isn't here.
Instead of doing the full matching, we always run /etc/devd-generic.
/etc/devd.generic will go away at some point, I think.

I'm committing it in this early state so I can start getting feedback
from early adapters.

Approved by: re

9 files changed, 852 insertions, 0 deletions

diff --git a/sbin/devd/Makefile b/sbin/devd/Makefile
new file mode 100644
index 0000000..899cf3c
--- /dev/null
+++ b/sbin/devd/Makefile
@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+PROG=	devd
+SRCS=	devd.c token.l parse.y y.tab.h
+MAN=	devd.8
+WARNS?=	5
+
+DPADD=	${LIBL}
+LDADD=	-ll
+
+YFLAGS+=-v
+CFLAGS+=-I. -I${.CURDIR}
+
+CLEANFILES= y.output
+
+.include <bsd.prog.mk>
diff --git a/sbin/devd/devd-generic b/sbin/devd/devd-generic
new file mode 100644
index 0000000..c75779d
--- /dev/null
+++ b/sbin/devd/devd-generic
@@ -0,0 +1,26 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+# Script called by devd(8) whenever a device appears or disappears.
+#
+# XXX this is a temporary hack that will go away soon
+
+dev="$1"
+startstop="$2"
+
+driver="${dev%%[0-9]*}"
+unit="${dev##*[^0-9]}"
+
+if [ -z "$driver" -o -z "$unit" ]; then
+	echo "cannot parse device \"$dev\"" 1>&2
+	exit 1
+fi
+
+case "$driver" in
+an|ar|awi|bge|cm|cnw|cs|dc|de|ed|el|em|ep|ex|fe|fxp|gem|gx|hme|ie|lge|lnc|my| \
+    nge|pcn|ray|rl|sf|sis|sk|sn|snc|ste|ti|tl|tx|txp|vr|vx|wb|wi|xe|xl)
+	# An ethernet interface; call pccard_ether to do the real work
+	/etc/pccard_ether "$dev" "$startstop"
+	;;
+esac
diff --git a/sbin/devd/devd.8 b/sbin/devd/devd.8
new file mode 100644
index 0000000..1d22da2
--- /dev/null
+++ b/sbin/devd/devd.8
@@ -0,0 +1,88 @@
+.\"
+.\" Copyright (c) 2002 M. Warner Losh.
+.\" 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 AUTHOR 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 AUTHOR 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 October 17, 2002
+.Dt DEVD 8
+.Os
+.Sh NAME
+.Nm devd
+.Nd "Device state change daemon"
+.Sh SYNOPSIS
+.Nm
+.Op Fl d
+.Sh DESCRIPTION
+The
+.Nm
+daemon provides a way to have userland programs run when certain
+kernel events happen.
+.Pp
+The following options are accepted.
+.Bl -tag -width indent
+.It Fl d
+Enable debugging messages and run in the foreground instead of
+becoming a daemon.
+.El
+.Sh IMPLEMENTATION NOTES
+.Nm 
+is a system daemon.
+It runs in the background all the time.
+When ever a device is added to or removed from the device tree, devd
+will cause a certain action to take place.
+In addition, when a device that is not matched enters the system, devd
+will also perform an action.
+.Pp
+.Nm 
+hooks into the
+.Xr devctl 4
+device driver.
+This device driver has hooks into the device configuration system.
+When nodes are added or deleted from the tree, this device will
+deliver information about the even to
+.Nm .
+Once 
+.Nm 
+has parsed the message, it will search its action list for that kind
+of event, and perform the action with the highest matching value.
+For most mundane uses, the default handlers are adequate.
+However, for more advanced users, the power is present to tweak every
+aspect of what happens.
+.Pp
+.Nm reads /etc/devd.conf, and that drives the rest of the process.
+While the format of this file is described in 
+.Xr devd.conf 5 
+some basics are covered here.
+In the options section, one can define multiple directories to search
+for config files.
+All files in each of these directories are parsed.
+These files are intended to be installed by third party vendors that
+wish to hook into the devd system without modifying the user's other
+config files.
+.Sh SEE ALSO
+.Xr devctl 4 ,
+.Xr devd.conf 5
+.Sh AUTHORS
+.An M. Warner Losh
diff --git a/sbin/devd/devd.c b/sbin/devd/devd.c
new file mode 100644
index 0000000..d607232
--- /dev/null
+++ b/sbin/devd/devd.c
@@ -0,0 +1,223 @@
+/*-
+ * Copyright (c) 2002 M. Warner Losh.
+ * 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 AUTHOR 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 AUTHOR 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.
+ */
+
+/*
+ * DEVD control daemon.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <err.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "devd.h"
+
+#define CF "/etc/devd.conf"
+
+extern FILE *yyin;
+extern int lineno;
+
+int dflag;
+int romeo_must_die = 0;
+struct file_list_head dirlist = TAILQ_HEAD_INITIALIZER(dirlist);
+
+static void event_loop(void);
+static void parse(void);
+static void parse_config_file(const char *fn);
+static void parse_files_in_dir(const char *dirname);
+static void reset_config(void);
+static void usage(void);
+
+void
+add_directory(const char *dir)
+{
+	struct file_list *elm;
+
+	elm = malloc(sizeof(*elm));
+	elm->path = strdup(dir);
+	TAILQ_INSERT_TAIL(&dirlist, elm, fl_link);
+}
+
+static void
+reset_config(void)
+{
+	struct file_list *flp;
+
+	TAILQ_FOREACH(flp, &dirlist, fl_link) {
+		free(flp->path);
+		free(flp);
+	}
+}
+
+static void
+parse_config_file(const char *fn)
+{
+	if (dflag)
+		printf("Parsing %s\n", fn);
+	yyin = fopen(fn, "r");
+	if (yyin == NULL)
+		err(1, "Cannot open config file %s", fn);
+	if (yyparse() != 0)
+		errx(1, "Cannot parse %s at line %d", fn, lineno);
+	fclose(yyin);
+}
+
+static void
+parse_files_in_dir(const char *dirname)
+{
+	DIR *dirp;
+	struct dirent *dp;
+	char path[PATH_MAX];
+
+	if (dflag)
+		printf("Parsing files in %s\n", dirname);
+	dirp = opendir(dirname);
+	if (dirp == NULL)
+		return;
+	readdir(dirp);		/* Skip . */
+	readdir(dirp);		/* Skip .. */
+	while ((dp = readdir(dirp)) != NULL) {
+		if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
+			snprintf(path, sizeof(path), "%s/%s",
+			    dirname, dp->d_name);
+			parse_config_file(path);
+		}
+	}
+}
+
+static void
+parse(void)
+{
+	struct file_list *flp;
+
+	parse_config_file(CF);
+	TAILQ_FOREACH(flp, &dirlist, fl_link) {
+		parse_files_in_dir(flp->path);
+	}
+}
+
+static void
+process_event(const char *buffer)
+{
+	char type;
+	char cmd[1024];
+	char *sp;
+
+	// Ignore unknown devices for now.
+	if (*buffer == '?')
+		return;
+	type = *buffer++;
+	sp = strchr(buffer, ' ');
+	if (sp == NULL)
+		return;	/* Can't happen? */
+	*sp = '\0';
+	snprintf(cmd, sizeof(cmd), "/etc/devd-generic %s %s", buffer,
+	    type == '+' ? "start" : "stop");
+	if (dflag)
+		printf("Trying '%s'\n", cmd);
+	system(cmd);
+}
+
+static void
+event_loop(void)
+{
+	int rv;
+	int fd;
+	char buffer[1024 + 1];	/* XXX */
+
+	fd = open("/dev/devctl", O_RDONLY);	 /* XXX */
+	if (fd == -1)
+		err(1, "Can't open devctl");
+	if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
+		err(1, "Can't set close-on-exec flag");
+	while (1) {
+		if (romeo_must_die)
+			break;
+		rv = read(fd, buffer, sizeof(buffer) - 1);
+		if (rv > 0) {
+			buffer[rv] = '\0';
+			while (buffer[--rv] == '\n')
+				buffer[rv] = '\0';
+			process_event(buffer);
+		} else if (rv < 0) {
+			if (errno != EINTR)
+				break;
+		} else {
+			/* EOF */
+			break;
+		}
+	}
+	close(fd);
+}
+
+static void
+gensighand(int foo __unused)
+{
+	romeo_must_die++;
+}
+
+static void
+usage()
+{
+	fprintf(stderr, "usage: %s [-d]", getprogname());
+	exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+	int ch;
+
+	while ((ch = getopt(argc, argv, "d")) != -1) {
+		switch (ch) {
+		case 'd':
+			dflag++;
+			break;
+		default:
+			usage();
+		}
+	}
+
+	reset_config();
+	parse();
+	if (!dflag)
+		daemon(0, 0);
+	event_loop();
+	signal(SIGHUP, gensighand);
+	signal(SIGINT, gensighand);
+	signal(SIGTERM, gensighand);
+	return (0);
+}
diff --git a/sbin/devd/devd.conf b/sbin/devd/devd.conf
new file mode 100644
index 0000000..33d271e
--- /dev/null
+++ b/sbin/devd/devd.conf
@@ -0,0 +1,92 @@
+// $FreeBSD$
+//
+// Refer to devd.conf(5) and devd(8) man pages for the details on how to
+// run and configure devd.
+//
+
+// NB: All regular expressions have an implicit ^$ around them.
+
+options {
+	// Each directory directive adds a directory the list of directories
+	// that we scan for files.  Files are read-in in the order that they
+	// are returned from readdir(3).  The rule-sets are combined to
+	// create a DFA that's used to match events to actions.
+	directory "/etc/devd";
+	directory "/usr/local/etc/devd";
+	pid-file "/var/run/devd.pid";
+
+	// Setup some shorthand for regex that we use later in the file.
+	set ethernet-nic-regex 
+		"(an|ar|aue|awi|bge|cm|cnw|cs|cue|dc|de|ed|el|em|ep|ex|\
+		fe|fxp|gem|gx|hme|ie|kue|lge|lnc|my|nge|pcn|ray|rl|\
+		sf|sis|sk|sn|snc|ste|ti|tl|tx|txp|vr|vx|wb|wi|xe|xl)[0-9]+";
+	set scsi-controller-regex
+		"(adv|advw|aic|aha|ahb|ahc|ahd|bt|ct|iir|isp|mly|mpt|ncv|nsp|\
+		stg|sym|wds)[0-9]+";
+};
+
+// Note that the attach/detach with the highest value wins, so that one can
+// override these general rules.
+
+// NB: device-name is shorthand for 'match device-name'
+
+//
+// For ethernet like devices, the default is to run dhclient.  Due to
+// a historical accident, the name of this script it called pccard_ether
+//
+attach 0 {
+	device-name "$ethernet-nic-regex";
+	action "/etc/pccard_ether $device-name start";
+};
+
+detach 0 {
+	device-name "$ethernet-nic-regex";
+	action "/etc/pccard_ether $device-name stop";
+};
+
+// An entry like this might be in a different file, but is included here
+// as an example of how to override things.  Normally 'ed20' would match
+// the above attach/detach stuff, but the value of 100 makes it
+// ed20 is hard wired to 1.2.3.4
+attach 100 {
+	device-name "ed20";
+	action "ifconfig $device-name inet 1.2.3.4 netmask 0xffff0000";
+};
+detach 100 {
+	device-name "ed20";
+};
+
+//
+// Rescan scsi device-names on attach, but not detach.
+//
+attach 0 {
+	device-name "$scsi-controller-regex";
+	action "camcontrol rescan all";
+};
+
+// Don't even try to second guess what to do about drivers that don't
+// match here.  Instead, pass it off to a smart script to deal.
+nomatch 0 {
+	action "/usr/local/bin/smart-loader $pnpinfo $location $bus";
+};
+
+// The following might be an example of something that a vendor might
+// install if you were to add their device.  This might reside in
+// /usr/local/etc/devd/deqna.conf.  A deqna is, in this hypothetical
+// example, a pccard ethernet-like device.  Students of history may
+// know other devices by this name, and will get the in-jokes in this
+// entry.
+nomatch 10 {
+	match "bus" "pccard[0-9]+";
+	match "manufacturer" "0x1234";
+	match "product" "0x2323";
+	action "kldload if_deqna";
+};
+attach 10 {
+	device-name "^deqna[0-9]+";
+	action "/etc/pccard_ether $device-name start";
+};
+detach 10 {
+	device-name "^deqna[0-9]+";
+	action "/etc/pccard_ether $device-name stop";
+};
diff --git a/sbin/devd/devd.conf.5 b/sbin/devd/devd.conf.5
new file mode 100644
index 0000000..10c0e5d
--- /dev/null
+++ b/sbin/devd/devd.conf.5
@@ -0,0 +1,133 @@
+.\"
+.\" Copyright (c) 2002 M. Warner Losh
+.\" 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. 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 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 AUTHOR 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.
+.\"
+.\"	$FreeBSD$
+.\"
+.\" The section on comments was taken from named.conf.5, which has the
+.\" following copyright:
+.\" Copyright (c) 1999-2000 by Internet Software Consortium
+.\"
+.\" 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+.\" ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+.\" CONSORTIUM 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 October 17, 2002
+.Dt DEVD.CONF 5
+.Os
+.Sh NAME
+.Nm devd.conf
+.Nd configuration file for
+.Xr devdd 8
+.Sh OVERVIEW
+.Ss General Syntax
+A
+.Xr devd 8 
+configuration consists of two general features, statements
+and comments.
+All statements end with a semicolon.
+Many statements can contain substatements, which are each also
+terminated with a semicolon.
+.Pp
+The following statements are supported:
+.Bl -tag -width 0n
+.It Ic options
+specifies various options and parameters for the operation of
+.Xr devd 8 .
+.It Ic attach
+specifies various matching criteria and actions to perform when
+a newly attached device matches said criteria.
+.It Ic detach
+specifies various matching criteria and actions to perform when
+a newly attached device matches said criteria.
+.It Ic nomatch
+specifies various matching criteria and actions to perform when
+no device driver currently loaded in the kernel claims a (new)
+device.
+.El
+.Pp
+Statements may occur in any order in the config file, and may be
+repated as often as required.
+Further details on the syntax and meaning of each statement, and their
+substatements is explained below.
+.Pp
+Comments may appear anywhere that whitespace may appear in a BIND
+configuration file.  To appeal to programmers of all kinds, they can
+be written in C, C++, or shell/perl constructs.
+.Pp
+C-style comments start with the two characters
+.Li /*
+(slash, star) and end with
+.Li */
+(star, slash).
+Because they are completely delimited with these characters,
+they can be used to comment only a portion of a line or to span
+multiple lines.
+.Pp
+C-style comments cannot be nested.  For example, the following is
+not valid because the entire comment ends with the first
+.Li */ :
+.Bd -literal -offset indent
+/* This is the start of a comment.
+   This is still part of the comment.
+/* This is an incorrect attempt at nesting a comment. */
+   This is no longer in any comment. */
+.Ed
+.Pp
+C++-style comments start with the two characters
+.Li //
+(slash, slash) and continue to the end of the physical line.
+They cannot be continued across multiple physical lines; to have
+one logical comment span multiple lines, each line must use the
+.Li //
+pair.  For example:
+.Bd -literal -offset indent
+// This is the start of a comment.  The next line
+// is a new comment, even though it is logically
+// part of the previous comment.
+.Ed
+.Pp
+.Em WARNING :
+you cannot use the
+.Li ;
+(semicolon) character to start a comment such as you would in a zone
+file.  The semicolon indicates the end of a configuration statement,
+so whatever follows it will be interpreted as the start of the next
+statement.
+.Sh FILES
+.Bl -tag -width 0n -compact
+.It Pa /etc/devd.conf
+The
+.Nm devd
+configuration file.
+.El
+.Sh SEE ALSO
+.Xr devd 8
diff --git a/sbin/devd/devd.h b/sbin/devd/devd.h
new file mode 100644
index 0000000..b35b16c
--- /dev/null
+++ b/sbin/devd/devd.h
@@ -0,0 +1,48 @@
+/*-
+ * DEVD (Device action daemon)
+ *
+ * Copyright (c) 2002 M. Warner Losh <imp@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 AUTHOR 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 AUTHOR 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 <sys/queue.h>
+
+int yylex(void);
+void yyerror(const char *s);
+int yyparse(void);
+void add_directory(const char *);
+
+struct file_list
+{
+	char *path;
+	TAILQ_ENTRY(file_list) fl_link;
+};
+
+TAILQ_HEAD(file_list_head, file_list);
+
+extern struct file_list_head dirlist;
+
+
diff --git a/sbin/devd/parse.y b/sbin/devd/parse.y
new file mode 100644
index 0000000..53c9a05
--- /dev/null
+++ b/sbin/devd/parse.y
@@ -0,0 +1,137 @@
+%{
+/*-
+ * DEVD (Device action daemon)
+ *
+ * Copyright (c) 2002 M. Warner Losh <imp@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 AUTHOR 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 AUTHOR 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 "devd.h"
+#include <stdio.h>
+
+%}
+
+%union {
+	char *str;
+	int i;
+}
+
+%token SEMICOLON BEGINBLOCK ENDBLOCK COMMA
+%token <i> NUMBER
+%token <str> STRING
+%token <str> ID
+%token OPTIONS SET DIRECTORY PID_FILE DEVICE_NAME ACTION MATCH
+%token ATTACH DETACH NOMATCH
+
+%type <str> id
+%type <i> number
+%type <str> string
+
+%%
+
+config_file
+	: config_list
+	;
+
+config_list
+	: config
+	| config_list config
+	;
+
+config
+	: option_block
+	| attach_block
+	| detach_block
+	| nomatch_block
+	;
+
+option_block
+	: OPTIONS BEGINBLOCK options ENDBLOCK SEMICOLON
+	;
+
+options
+	: option
+	| options option
+
+option
+	: directory_option
+	| pid_file_option
+	| set_option
+	;
+
+directory_option
+	: DIRECTORY string SEMICOLON { add_directory($2); }
+	;
+
+pid_file_option
+	: PID_FILE string SEMICOLON
+	;
+
+set_option
+	: SET id string SEMICOLON
+	;
+
+attach_block
+	: ATTACH number BEGINBLOCK match_or_action_list ENDBLOCK SEMICOLON
+	;
+
+detach_block
+	: DETACH number BEGINBLOCK match_or_action_list ENDBLOCK SEMICOLON
+	;
+
+nomatch_block
+	: NOMATCH number BEGINBLOCK match_or_action_list ENDBLOCK SEMICOLON
+	;
+
+match_or_action_list
+	: match_or_action
+	| match_or_action_list match_or_action
+	;
+
+match_or_action
+	: match
+	| action
+	;
+
+match
+	: MATCH string string SEMICOLON
+	| DEVICE_NAME string SEMICOLON
+	;
+
+action
+	: ACTION string SEMICOLON
+	;
+
+number
+	: NUMBER	{ $$ = $1; }
+
+string
+	: STRING	{ $$ = $1; }
+
+id
+	: ID		{ $$ = $1; }
+
+%%
diff --git a/sbin/devd/token.l b/sbin/devd/token.l
new file mode 100644
index 0000000..233abec
--- /dev/null
+++ b/sbin/devd/token.l
@@ -0,0 +1,89 @@
+%{
+/*-
+ * DEVD (Device action daemon)
+ *
+ * Copyright (c) 2002 M. Warner Losh <imp@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 AUTHOR 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 AUTHOR 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 <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include "devd.h"
+#include "y.tab.h"
+
+int lineno = 1;
+#define YY_NO_UNPUT
+
+%}
+
+%%
+
+[ \t]+			;
+\n			lineno++;
+;			{ return SEMICOLON; }
+\/\/.*$			;
+\/\*(.|\n)*\*\/		;
+\{			{ return BEGINBLOCK; }
+\}			{ return ENDBLOCK; }
+[0-9]+			{ yylval.i = atoi(yytext); return NUMBER; }
+\"[^"]+\"		{
+				int len = strlen(yytext) - 2;
+				if ((yylval.str = (char *) malloc(len + 1)) == NULL)
+					goto out;
+				memcpy(yylval.str, yytext + 1, len);
+				yylval.str[len] = '\0';
+			out:;
+				return STRING;
+			}
+
+
+options			{ return OPTIONS; }
+set			{ return SET; }
+directory		{ return DIRECTORY; }
+pid-file		{ return PID_FILE; }
+attach			{ return ATTACH; }
+detach			{ return DETACH; }
+device-name		{ return DEVICE_NAME; }
+action			{ return ACTION; }
+match			{ return MATCH; }
+nomatch			{ return NOMATCH; }
+[A-Za-z][A-Za-z0-9-]*	{
+				int len = strlen(yytext);
+				if ((yylval.str = (char *) malloc(len + 1)) == NULL)
+					goto out2;
+				memcpy(yylval.str, yytext + 1, len);
+				yylval.str[len] = '\0';
+			out2:;
+				return ID;
+			}
+%%
+
+void
+yyerror(const char *s)
+{
+	syslog(LOG_ERR, "line %d: %s%s %s.\n", lineno, yytext, yytext?":":"", s);
+}