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#!/bin/bash
# function used by fetch-all* to download server descriptors and
# extra info documents
# Copyright (c) 2005, 2006, 2007, 2008 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
fetch_digest() {
local digest
local objecttype
local urlpart
local pathpart
local target
local targetdir
local dirserver
local ei
digest="$1"
objecttype="$2"
if [ "$objecttype" = "server-descriptor" ] ; then
urlpart="server"
pathpart="server-descriptor"
elif [ "$objecttype" = "extra-info" ] ; then
urlpart="extra"
pathpart="extra-info"
else
echo "Called fetch_digest with illegal objecttype '$objecttype'" >&2
exit 1
fi
target=$( echo $digest | sed -e 's#^\(.\)\(.\)#'"$pathpart"'/\1/\2/\1\2#' )
targetdir=$( dirname $target )
[ -d "$targetdir" ] || mkdir -p "$targetdir"
if ! [ -e "$target" ]; then
for dirserver in $DIRSERVERS; do
wget -q -O "$target" http://$dirserver/tor/$urlpart/d/"$digest" || rm -f "$target"
if [ -s "$target" ]; then
if egrep '^opt extra-info-digest ' "$target" > /dev/null; then
ei=$( egrep '^opt extra-info-digest ' "$target" | awk '{print $3}' | tr 'A-F' 'a-f' )
fetch_digest "$ei" "extra-info"
elif egrep '^extra-info-digest ' "$target" > /dev/null; then
ei=$( egrep '^extra-info-digest ' "$target" | awk '{print $2}' | tr 'A-F' 'a-f' )
fetch_digest "$ei" "extra-info"
fi
break
else
rm -f "$target"
fi
done
fi
#if ! [ -e "$target" ]; then
# echo "$objecttype $digest" >> failed
#fi
}
if [ -x /usr/bin/base64 ] ; then
base64-decode() {
/usr/bin/base64 -d
}
else
base64-decode() {
perl -MMIME::Base64 -e 'print decode_base64(<>)'
}
fi
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