#!/bin/bash
#
# uncmount
# Script to mount a remote SMB file share using a standard UNC address.
#
# Written by Charles Rutledge
# Copyright (c) 2004 Centauri Computer Works, Inc.
#
# Version 1.00
#
# This program is licensed under the terms of the GNU General Public License,
# Version 2 (or at your option, any later version) as published by the Free
# Software Foundation, Inc., 59 Temple Place, Suite 220, Boston MA 0211, and
# available online at http://www.gnu.org/copyleft/gpl.html.
#
# THIS PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
# EXPRESSED OR IMPLIED.  YOU ASSUME ALL RISKS FOR THE USE OF THIS PROGRAM.

# -----------------------  LOCAL SITE VARIABLES  -----------------------
#
# This is the default credentials file that will be used to authenicate the
# remote connection if no credentials file is specified.
#
SMB_CREDENTIALS=/etc/smb-credentials

#
# This is the username and group that will be used for the mounted UNC file
# share.
#
MOUNT_AS_USER=root
MOUNT_AS_GROUP=users

# -------------  DO NOT MODIFY ANYTHING BELOW THIS LINE  --------------
#
# The first argument must be a valid (formatted, anyway) UNC file share.  It
# can include directories beyond the //server-name/file-share, but these will
# be silently ignored.
#
if [ -z "$1" ]; then
    echo "USAGE: uncmount <unc-file-share> [rw] [<credentials-file>]"
    exit 1
fi
if [ `echo $1 | cut -c1-2` = '\\' ]; then
    # --- Windows-style UNC format
    UNC_SERVER=`echo $1 | cut -d'\' -f3`
    UNC_SHARE=`echo $1 | cut -d'\' -f4`
    if [ -z $UNC_SHARE ]; then
        echo "ERROR: $1 is not a valid UNC file share."
        exit 1
    fi
elif [ `echo $1 | cut -c1-2` = '//' ]; then
    # --- UNIX-style UNC format
    UNC_SERVER=`echo $1 | cut -d'/' -f3`
    UNC_SHARE=`echo $1 | cut -d'/' -f4`
    if [ -z $UNC_SHARE ]; then
        echo "ERROR: $1 is not a valid UNC file share."
        exit 1
    fi
else
    echo "ERROR: $1 is not a valid UNC file share."
    exit 1
fi

#
# The second argument can either be the optional 'rw' parameter, indicating
# that the share should be mounted read-write (read-only is the default).  If
# the 'rw' parameter is omitted, then the second argument could specify the
# credentials files to use.
#
ACCESS_MODE="ro"
if [ -n "$2" ]; then
    if [ "$2" = "rw" ]; then
        ACCESS_MODE="rw"
        shift
    elif [ -n "$3" ]; then
        #
        # If a credendials file is specified in third argument, then this is a
        # syntax error.
        #
        echo "USAGE: uncmount <unc-file-share> [rw] [<credentials-file>]"
        exit 1
    fi
fi

#
# See if a credentials file was specified.  It will have been shifted into the
# second argument position by the preceeding step.  And we need to be sure the
# credentials file exists even if it is the default file.
#
[ -n "$2" ] && SMB_CREDENTIALS="$2"
if [ ! -r $SMB_CREDENTIALS ]; then
    echo "ERROR: Credentials file $SMB_CREDENTIALS does not exist."
    exit 1
fi

#
# See if the UNC file share is already mounted.
#
MOUNT_POINT=`echo "/mnt/smb/$UNC_SERVER/$UNC_SHARE" | tr -d [$]`
if [ `cat /etc/mtab | grep -cw $MOUNT_POINT` -eq 1 ]; then
        echo "UNC file share //$UNC_SERVER/$UNC_SHARE already mounted"
        exit 0
fi

#
# Mount the UNC file share on the mount point /mnt/smb/UNC_SERVER/UNC_SHARE,
# stripping off any trailing '$' which Windows uses to identify hidden shares.
# If the mount point does not already exist, it will be created on demand.
#
[ ! -d /mnt ] && mkdir /mnt
[ ! -d /mnt/smb ] && mkdir /mnt/smb
[ ! -d /mnt/smb/$UNC_SERVER ] && mkdir /mnt/smb/$UNC_SERVER
# --- Use MOUNT_POINT here to avoid a trailing '$' on the share name.
[ ! -d $MOUNT_POINT ] && mkdir $MOUNT_POINT
if [ "$ACCESS_MODE" = "rw" ]; then
    /sbin/mount.smbfs //$UNC_SERVER/$UNC_SHARE $MOUNT_POINT -o credentials=$SMB_CREDENTIALS,uid=$MOUNT_AS_USER,gid=$MOUNT_AS_GROUP,fmask=660,dmask=770,rw
else
    /sbin/mount.smbfs //$UNC_SERVER/$UNC_SHARE $MOUNT_POINT -o credentials=$SMB_CREDENTIALS,uid=$MOUNT_AS_USER,gid=$MOUNT_AS_GROUP,fmask=440,dmask=550,ro
fi

uncmount <smb-file-share> [rw] [<credentials-file>]

username = <value>
password = <value>