#!/bin/sh
# Mounting SMB shares as specified user.
# Required: .mssmbrc file in users home directory (see man mssmbrc)
# with descriped shares and mount points (slightly mirrors /etc/fstab)
# and .nsmbrc file (see man mount_smbfs)
# Usage: mountsmb [-a] [-u user] [-m mountpoint]
# Written by CityCat at 05.02.2003	Version 0.90.1
# Translated to sh at 22.09.2005 by CityCat
# $Id: mountsmb2,v 1.3 2006/05/12 08:14:13 shelton Exp $

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

# Usage printing function
usage()
{
  cat << !EOM

MountSMB, a SMB/CIFS shared resources mounter. Version 0.91.1
Usage: mountsmb {-h | -a | -m mountpoint [-u username]}

      -h - this (very useful) help screen
      -a - mount all resources, marked as "auto"
      -m mountpoint - mount only specified mountpoint
      -u username - mount as specified username

!EOM
}

# Mounting SMB share function
do_smbmount()
{
  set $smbshare
  $util_mount_smbfs $mfmode $dfmode //$username@$1/$2 $3
  rc=$?

# Check on succesful mounting
  if [ $rc -ne 0 ]; then
    echo "Mounting $1/$2 to $3 under user rights $username unsuccesful, rc = $rc"
   else
     echo "Mounting $1/$2 to $3 under user rights $username succesful"
  fi
}

# Initial values
allmount=0
effuser=""
mpoint=""

# Parse a command line
args=`getopt ham:u: $*`;

if [ $# -eq 0 ]; then
  usage
  exit 20
fi

set -- $args

for i in $args
 do
   case "$i"
    in
   	-h) usage
            exit;;

        -a) allmount=1;
            shift;;

        -u) effuser="$2"; shift;
            shift;;

        -m) mpoint="$2"; shift;
            shift;;

        --) shift; break;;
   esac
 done

# Check on presence attendant utilites
wtools="mount mount_smbfs"

for tool in $wtools
 do
  locator=`whereis -b  $tool`
  set $locator

  if [ -z $2 ]; then
    echo "Your system does not include $tool utility, install it firstly"
    exit 15
   else
     eval "util_$tool=$tool"
  fi
 done

# Checking permissions to mount/umount shares
euid=`id -u`

if [ ! $euid -eq 0 ]; then
  echo "Only root can mount or umount SMB share resouces, please use su/sudo"
  exit 17
fi

# Checking on presence any parameters. User should specify -a or -m mountpoint
if [ $allmount -eq 0 ] && [ ${#mpoint} -eq 0 ]; then
  echo "You should specify -a or -m mountpoint"
  exit 18
fi

# Checking on presence .mssmbrc in home directory
if [ ! -e $HOME/.mssmbrc ]; then
  echo "File .mssmbrc missed in home directory"
  exit 19
fi

# Set username, when it was missed
if [ ${#effuser} -eq 0 ]; then
  username=$USER
 else
   username=$effuser
fi

# Parse .mssmbrc file for newline
strip="
"
saveifs=$IFS
IFS=$strip

smbshares=`cat $HOME/.mssmbrc`

# Check each described share and try to mount it, when -a specified and it still
# didn't mounted. Search specified share and try to mount it, when it still didn't
# mounted.
for smbshare in $smbshares
 do
  IFS=$saveifs

# Auto-parse line from .mssmbrc file.
# Here:
# $1 - server, $2 - share, $3 - mountpoint, $4 - files mode, $5 - dirs mode
# $6 - sign for auto/manually mounting
  set $smbshare

# Check on comment line
  comment=`echo $1 | awk '{print substr($0,1,1)}'`

  if [ $comment = "#" ]; then
    continue
  fi

# Ensure, that this share is already mounted
  domount=`$util_mount | grep -i $username@$1/$2`

  if [ ${#domount} -eq 0 ]; then

# Set file mode as specified. When specified "none" do not apply this parameter
    if [ $4 = "none" ]; then
      mfmode=""
     else
       mfmode="-f $4"
    fi

# Set directory mode as specified. When specified "none" do not apply this parameter
    if [ $5 = "none" ]; then
      dfmode=""
     else
       dfmode="-d $5"
    fi

# Do mount this share, when automount is requested
    if [ $allmount -eq 1 ] && [ $6 = "auto" ]; then
      do_smbmount
      continue
    fi

# Do mount this share, when mount point was specified exactly and exit
    if [ $mpoint = $3 ]; then
      do_smbmount
      exit
    fi
  fi

  IFS=$strip

 done