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#!/bin/sh
##
# Copyright 2011 Marco Ceppi <marco@ceppi.net>
#
# This file is part of Charm Helpers.
#
# Charm Helpers 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 3 of the License, or
# (at your option) any later version.
#
# Charm Helpers 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 Charm Helpers. If not, see <http://www.gnu.org/licenses/>.
##
##
# Globally overridable settings. Make sure to set them before sourcing
# this file.
CH_WGET_ARGS=${CH_WGET_ARGS:-"-q --content-disposition"}
##
# Get File
# Retrives a file and compares the file to a hash
#
# param FILE URL or Path to file
# param HASH URL, Path, or HASH string for file's hash
#
# return filepath|null
##
ch_get_file()
{
local FILE=${1:-""}
local HASH=${2:-""}
local CH_DOWNLOAD_DIR=${CH_DOWNLOAD_DIR:-"`mktemp -d /tmp/ch-downloads.XXXXXX`"}
if [ `ch_is_url "$FILE"` ]; then
wget $CH_WGET_ARGS --directory-prefix="$CH_DOWNLOAD_DIR/" "$FILE"
FILE=$CH_DOWNLOAD_DIR/$(ls -tr $CH_DOWNLOAD_DIR|head -n 1)
fi
if [ ! -f "$FILE" ]; then
return 2
fi
if [ -z "$HASH" ];then
#echo "Warning, no has specified. The file will be downloaded but not cryptographically checked!" > 2
echo "$FILE"
return 0
elif [ `ch_is_url "$HASH"` ]; then
local HASHNAME=$(basename $HASH)
wget $CH_WGET_ARGS "$HASH" -O /tmp/$HASHNAME
HASH=$(cat /tmp/$HASHNAME | awk '{ print $1 }')
elif [ -f "$HASH" ]; then
HASH=$(cat "$HASH" | awk '{ print $1 }')
fi
local HASH_TYPE=$(ch_type_hash $HASH)
if [ -z "$HASH_TYPE" ]; then
return 3
else
local FILE_HASH=$(${HASH_TYPE}sum $FILE | awk '{ print $1 }')
if [ "$FILE_HASH" != "$HASH" ]; then
return 4
fi
fi
echo "$FILE"
return 0
}
##
# Hash Type
# Determine, using best approximation, if the hash is valid and what type
# of hashing algorithm was used
#
# param HASH
#
# return type|false
##
ch_type_hash()
{
local DIRTY="$1"
case $DIRTY in
*[![:xdigit:]]* | "" )
echo ""
return 1
;;
* )
case ${#DIRTY} in
32 )
echo md5
;;
40 )
echo sha1
;;
64 )
echo sha256
;;
esac
;;
esac
}
##
# Is URL?
# Checks if the string passed is a valid URL (http(s), ftp)
#
# param URL The URL to be checked
#
# return boolean
##
ch_is_url()
{
local DIRTY="$1"
case "$DIRTY" in
"http://"* | "https://"* | "ftp://"*)
echo true
return 0
;;
*)
return 1
;;
esac
}
##
# Is IP?
# Checks if the string passed is an IP address
#
# param IP The IP addressed to be checked
#
# return boolean
##
ch_is_ip()
{
local DIRTY="$1"
local IP=$(echo $DIRTY | awk -F. '$1 <=255 && $2 <= 255 && $3 <= 255 && $4 <= 255 ')
if [ -z "$IP" ]; then
return 1
else
echo true
return 0
fi
}
##
# Get IP
# Returns the first IP match to the hostname provided
#
# param HOSTNAME Host for which to retrieve an IP
#
# return IP|false
##
ch_get_ip()
{
local HOST="$1"
#So, if there's multiple IP addresses, just grab the first
# for now.
if [ `ch_is_ip "$HOST"` ]; then
echo "$HOST"
return 0
fi
local CHECK_IP=$(host -t A $HOST | awk 'NR==1{ print $4 }')
if [ ! `ch_is_ip "$CHECK_IP"` ]; then
# Try a dig, why not?
CHECK_IP=$(dig +short $HOST | awk 'NR==1{ print $1 }')
if [ ! `ch_is_ip "$CHECK_IP"` ]; then
return 1
fi
fi
echo $CHECK_IP
return 0
}
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