#!/bin/bash
# -------------------------------------------------------------------
# Filename: auto.smb
# Version: 1.1
# Author: Dieter Demerre
# CopyRight: GPL
# Disclaimer: No guarantee to function, Use at Own Risk.
# History: 2001-09-28
#    v1.0 2001-09-28 dd First functioning implementation
#    v1.1 2001-10-01 dd Removed passwords from script file,
#                       introduction auto.smb.conf
#                       debug-flag now protected
#         2003-05-07 robin.rosenberg.dewire.com Add support for credentials
# -------------------------------------------------------------------
# An executable that should be able to detect what shares are
# accessable for a certain machine (passed as argument),
# and thus output its mount-scheme.
#
# Credentials can be used in order to supply a domain name for the
# authentication. When credentials are used you should supply
# extra options in the credentials file for group id /
# 
# $default:@/home/robin/credentials:-:,gid=robin,dmask=0775,fmask=0774
#
# -------------------------------------------------------------------
# Framework based upon the /etc/auto.net file delivered with SuSE 7.1
# -------------------------------------------------------------------

CONFIGFILE=/etc/auto.smb.conf

# These lines should protect the internal debug-flag  from tampering
# by the caller.  They should appear as first lines in the script.
if test ! -z "$debug" ; then
  autosmbdebug=$debug
  unset debug
fi

if [ -x /usr/bin/smbclient3 ]
then
    SMBVERSION=3
elif [ -x /usr/bin/smbclient2 ]
then
    SMBVERSION=2
else
    SMBVERSION=""
fi

# To enable a small executional trace, set debug=Y all else produces
# no debug info.
#debug=Y

# -------------------------------------------------------------------
# This file contains some constants that can be overridden by the
# $default line within the configuration file.
# -------------------------------------------------------------------
defUSR=Guest
defPWD=Guest
defOPT=",gid=disk,dmask=0775,fmask=0774"

function ReadConfiguration
{

  if test ! -z "$debug" -a "$debug" = "Y" ; then echo "checking $2 for $1" ; fi
  if test -z "$2" -o ! \( -f "$2" -a -r "$2" \); then
    SMBN=$defUSR
    SMBP=$defPWD
    OPTS=$defOPT
    echo "Error calling ReadConfiguration (no filename or $2 is unreadble)" >&2
  else 
    `grep '^\$default:' $2 | awk -F: -- '
         { print "export defUSR=" $2 " defPWD=" $3 " defOPT=" $4 "" }
       '
    `  
    if test ! -z "$debug" -a "$debug" = "Y" ; then 
      echo "retrieved default U:$defUSR, P:$defPWD; O:$defOPT"
    fi
    SMBN=$defUSR
    SMBP=$defPWD
    OPTS=$defOPT
    `grep ^$1: $2 | awk -F: -- '
         { print "export SMBN=" $2 " SMBP=" $3 " OPTS=" $4 }
       '
    `
    if test -z "$OPTS" ; then OPTS=$defOPT ; fi
    if test ! -z "$debug" -a "$debug" = "Y" ; then 
      echo "retrieved info for $1 U:$SMBN, P:$SMBP; O:$OPTS"
    fi
  fi
  if [ "${SMBN:0:1}" = "@" ]
  then
    CRED="${SMBN:1}"
    SMBN=$(awk -F= '/username/ { print $2 }' "$CRED")
    SMBP=$(awk -F= '/password/ { print $2 }' "$CRED")
    MID=",credentials=$CRED"
    LOP="-U $SMBN%$SMBP"
  else
    if test -z "$SMBP" ; then
	MID=",username=$SMBN"
	LOP="-U $SMBN -N"
    else
	MID=",username=$SMBN,password=$SMBP"
	LOP="-U $SMBN%$SMBP"
    fi
  fi
  if test ! -z "$debug" -a "$debug" = "Y" ; then 
    echo "composed for $1 U:\"$SMBN\", P:\"$SMBP\"; O:\"$OPTS\"; L=\"$LOP\"; M=\"$MID\""
  fi
}

if test -z "$1" ; then 
  host=localhost
else
  host="$1"
fi

test ! -z "$CONFIGFILE" -a -f "$CONFIGFILE"  &&  ReadConfiguration "$host" "$CONFIGFILE" ;

# Change smbclient and smbfs s/$/2/
opts="-fstype=smbfs$SMBVERSION$OPTS$MID"
SMBCLIENT="/usr/bin/smbclient$SMBVERSION -L $host $LOP"

if test ! -z "$debug" -a "$debug" = "Y" ; then 
  echo "command $SMBCLIENT"
fi

$SMBCLIENT | grep '[^ ]*[^$ ] *Disk[$ ]*[^/]' | sort +0 | \
	awk -v key="$host" -v opts="$opts" -- '
	BEGIN		{ ORS=""; first=1 }
			{ if (first) { print opts; first=0 }; print " \\\n\t/" $1, "//" key "/" $1 }
	END		{ if (!first) print "\n"; else exit 1 }
	'

if test ! -z "$autosmbdebug" ; then
  debug=$autosmbdebug
  unset autosmbdebug
fi