Let’s say you want to ssh from your work.com PC to home.com using the proxy.work.com HTTP(S) proxy. If the work.com admins are lenient, you can use ProxyTunnel as described here and be done. If they’re more aggressive, they can block you because the protocol exchange will go something like this:
Your work.com PC says:
- CONNECT home.com:22 HTTP/1.0
- Proxy-Connection: Keep-Alive
home.com responds with:
At this point proxy.work.com is able to see that you’re trying to tunnel SSH and can block the connection.
Another option is to tunnel over HTTPS instead of HTTP. Apache however doesn’t currently (Feb. 2010) support this option. You can read more about it here and perhaps use one of the patches mentioned there to add that feature to your server.
If you don’t want to patch the web server, there’s an alternative option that involves Stunnel. That’s what this post is about.
With stunnel in place, the protocol exchange will go something like this:Watch Full Movie Online Streaming Online and Download
work.com:
- CONNECT home.com:70 HTTP/1.0
- Proxy-Connection: Keep-Alive
home.com responds with:
- HTTP/1.0 200 Connection Established
At this point stunnel takes over and hides the SSH protocol handshake letting you pass through the proxy without a hassle.
There are two ways to accomplish this. The first way requires you to open another port in your home.com firewall and allow connections to stunnel from outside. The second way uses your Apache server as a second proxy.
This is a very simple script. See the usage at the top of the script starting on line 28.
#!/bin/bash
# Author: Gabriel Burca (gburca dash mp3 at ebixio dot com)
# Version: 1.0
#
# Copyright (C) 2006-2009 Gabriel Burca (gburca dash mp3 at ebixio dot com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
set -o nounset
set -o errexit
function usage () {
cat << EOF
Checks for particular id3v2 frames in a set of files.
Usage:
$0 <option> <FRAME> files...
Options:
-m | --missing Show files that are missing the frame
-h | --has Show files that have the frame
-s | --show Show the contents of the frame
-a | --all Show all the frames
For example, to find mp3's with no album art:
$0 -m APIC *.mp3
Some sample frames:
APIC - Cover art
TIT2 - Song name
TPE1 - Artist
TALB - Album
TCON - Genre
EOF
}
function FilesWithoutFrame() {
FRAME=$1
shift
for file in $@ ; do
id3v2 -R "$file" | egrep "^$FRAME " 2>&1 > /dev/null
if [ $? -gt 0 ]; then
# $file is missing $FRAME
echo $file
fi
done
}
function FilesWithFrame() {
FRAME=$1
shift
for file in $@ ; do
id3v2 -R "$file" | egrep "^$FRAME " 2>&1> /dev/null
if [ $? -eq 0 ]; then
# $file has $FRAME
echo $file
fi
done
}
function ShowFrameContents() {
FRAME=$1
shift
for file in $@ ; do
id3v2 -R "$file" | egrep "^$FRAME "
done
}
function ShowAll() {
for file in $@; do
echo
echo
id3v2 -R "$file"
done
}
################################################################################
# main()
################################################################################
if [ $# -lt 2 ]; then
usage
exit 1
fi
IFS_orig=$IFS
IFS='
'
case $1 in
-m | --missing)
shift
FilesWithoutFrame $@
;;
-h | --has)
shift
FilesWithFrame $@
;;
-s | --show)
shift
ShowFrameContents $@
;;
-a | --all)
shift
ShowAll $@
;;
*)
usage
exit 1
;;
esac
IFS=$IFS_orig
In case it might be useful to others, here’s a script that can be used to convert a bunch of *.wav files to *.flac and *.flac files to *.mp3. The script will first first convert all *.wav files (if any) to *.flac, then it will convert all *.flac files to *.mp3. See the usage instructions starting on line 31 below for more details.
I called the script
Watch Full Movie Online Streaming Online and Download
flac2mp3dir.sh
#!/bin/bash
# Author: Gabriel Burca (gburca dash flac2mp3dir at ebixio dot com)
# Version: 1.0
#
# Copyright (C) 2006-2009 Gabriel Burca (gburca dash flac2mp3dir at ebixio dot com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
set -o nounset
set -o errexit
function usage () {
cat << EOF
Usage:
$0 source/dir dest/dir
All wav/flac files in source/dir and its subdirectories will be converted to
mp3 and placed in dest/dir while maintaining the directory structures. ID3
tags will also be copied from flac to mp3 files.
Existing files (mp3 or flac) will not be overwritten.
Source and destination directories can be the same.
EOF
}
function absname () {
# Returns the absolute filename of a given file or directory.
if [ -d "$1" ] ; then # Only a directory name.
dir="$1"
#unset file
file=""
elif [ -f "$1" ] ; then # Strip off and save the filename.
dir=$(dirname "$1")
file="/"$(basename "$1")
else
# The file did not exist.
# Return null string as error.
echo
return 1
fi
# Change to the directory and display the absolute pathname.
cd "$dir" > /dev/null
echo "${PWD}${file}"
}
function flac2mp3 () {
INF="$1"
OUTF=`echo "$INF" | sed 's/\.flac$/.mp3/'`
PWD=`pwd`
SUBDIR=${PWD:$SRCDIRLEN}
#SUBDIR=${PWD#$SRCDIR}
INF="$PWD/$INF"
OUTF="$DESTDIR$SUBDIR/$OUTF"
#echo "$INF ... $PWD $SRCDIRLEN $SUBDIR $OUTF"
if [ -e "$OUTF" ] ; then
if [ "$OUTF" -ot "$INF" ] ; then
echo "*** Re-converting old file: $OUTF"
# rm -f "$OUTF"
else
echo "*** Skip flac2mp3! Output file already exists: $OUTF"
return
fi
fi
if [ ! -e "$DESTDIR$SUBDIR" ] ; then
mkdir -p "$DESTDIR$SUBDIR"
fi
# Convert flac to mp3
echo "${INDENT}flac2mp3 Converting $INF => $OUTF"
#touch "$OUTF"
flac -c -d "$INF" | lame --preset standard --replaygain-accurate - "$OUTF"
# Copy tags to new file
id3 -D "$INF" -1 -2 "$OUTF"
# Copy non-flac/non-wav (folder.jpg, etc...) files to dest/dir
if [[ ! -e "$DESTDIR$SUBDIR/folder.jpg" && -e "folder.jpg" ]] ; then
cp folder.jpg "$DESTDIR$SUBDIR"
fi
}
function wav2mp3 () {
INF="$1"
OUTF=`echo "$INF" | sed 's/\.wav$/.flac/'`
if [ -e "$OUTF" ] ; then
echo "*** Skip wav2mp3! Output file already exists: $OUTF"
return
fi
echo "${INDENT}wav2mp3 Converting $INF => $OUTF"
#touch "$OUTF"
flac -V -o "$OUTF" "$INF"
flac2mp3 "$OUTF"
}
function traveldir ()
{
dir="$1"
pushd "$dir" > /dev/null
echo "Entering: `pwd`"
for a in *
do
if test -d "$a" ; then
traveldir "$a"
else
if [[ `expr match "$a" '.*\\.flac$'` > 0 ]] ; then
flac2mp3 "$a"
elif [[ `expr match "$a" '.*\\.wav$'` > 0 ]] ; then
wav2mp3 "$a"
else
echo "${INDENT}Skipping: $a"
fi
fi
done
popd > /dev/null
}
################################################################################
# main()
################################################################################
if [[ $# < "2" ]] ; then
usage
exit 1
fi
SRCDIR="$1"
DESTDIR="$2"
if [[ ! -e "$DESTDIR" ]] ; then
mkdir -p "$DESTDIR"
fi
if [[ ! -e "$SRCDIR" ]] ; then
echo "$SRCDIR does not exist!"
exit 2
fi
# Get absolute directories
SRCDIR=$(absname "$SRCDIR")
DESTDIR=`absname "$DESTDIR"`
SRCDIRLEN=`expr length "$SRCDIR"`
INDENT=" "
pushd . > /dev/null
traveldir "$SRCDIR"
popd > /dev/null
At one point I had a need to extract various pieces of information from the f-spot photo.db file (that’s where f-spot keeps all the information), so I wrote this script. Posting it here in case others find it useful. I called it
f-spot-list
#!/bin/bash
# Author: Gabriel Burca (gburca dash fspotlist at ebixio dot com)
# Version: 1.0
#
# Copyright (C) 2006-2009 Gabriel Burca (gburca dash fspotlist at ebixio dot com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
set -o nounset
set -o errexit
function usage () {
cat << EOF
Extracts various pieces of information from an f-spot photo.db file.
Usage:
$0 <photo.db> <option>
Options:
-P | --Photo Pictures in the Photo directory
-k | --links DIR... All pictures in DIR that are not links
-a | --all All pictures in database
-h | --has TAG... Show pictures tagged with the tag
-t | --tags Show all available tags
<photo.db> is usually "~/.config/f-spot/photos.db"
Ex:
- Find all photos tagged "Favorites" or "Web":
$0 photos.db -h Favorites Web | sort | uniq | sed 's|^file://||' \
| xargs -I linkName readlink -e linkName
EOF
}
function PhotosInPhotoDir() {
sqlite3 "$PHOTO_DB" "select id, uri from photos where uri like '%Photos%';"
}
function HasTag() {
for TAG in $@ ; do
SQL="select base_uri || filename from photos \
inner join photo_tags on photos.id = photo_tags.photo_id \
inner join tags on photo_tags.tag_id = tags.id \
where tags.name like '$TAG';"
#echo $SQL
sqlite3 "$PHOTO_DB" "$SQL"
done
}
function ShowNonLinks() {
for DIR in $@ ; do
find "$DIR" -type f
done
}
function ShowTags() {
sqlite3 "$PHOTO_DB" "select name from tags order by name;"
}
function ShowAll() {
sqlite3 "$PHOTO_DB" "select * from photos;"
}
################################################################################
# main()
################################################################################
if [ $# -lt 2 ]; then
usage
exit 1
fi
IFS_orig=$IFS
IFS='
'
PHOTO_DB=$1
shift
if [ ! -e "$PHOTO_DB" ]; then
usage
exit 2
fi
case $1 in
-P | --Photo)
shift
PhotosInPhotoDir $@
;;
-k | --links)
shift
ShowNonLinks $@
;;
-t | --tags)
shift
ShowTags $@
;;
-h | --has)
shift
HasTag $@
;;
-a | --all)
shift
ShowAll $@
;;
*)
usage
exit 1
;;
esac
IFS=$IFS_orig