common.sh

#!/bin/bash
# Copyright (C) 2004-2009 Centro de Computacao Cientifica e Software Livre
# Departamento de Informatica - Universidade Federal do Parana - C3SL/UFPR
#
# This file is part of client, it is used to store common functions
#
# common.sh 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.


#------------------------------------------------------------------------------
# Function: getProxyConf
# Load the proxy configuration.
function getProxyConf()
{
    # Use collect variable, if defined. Otherwise use the client one
    if ! test -z "${PREFIX}"; then
        PROXYCONF="${PREFIX}/client/conf/proxy"
    else
        PROXYCONF="${dirname}/conf/proxy"
    fi

    # Obtain proxy configuration by reading the proxy file
    phost=$(grep "^phost=" ${PROXYCONF} 2> /dev/null | cut -f2 -d=)
    pport=$(grep "^pport=" ${PROXYCONF} 2> /dev/null | cut -f2 -d=)
    puid=$(grep "^puid=" ${PROXYCONF} 2> /dev/null | cut -f2 -d=)
    ppasswd=$(grep "^ppasswd=" ${PROXYCONF} 2> /dev/null | cut -f2 -d=)

    # If there is any proxy information, add a message to log
    if test -n "${phost}${pport}${puid}${ppasswd}"; then
        printf "Proxy configuration being used.\n" >> ${log}
        # If there is a valued system proxy variable, print a warning to log
        if test -n "${http_proxy}"; then
            printf "WARNING: The proxy file is " >> ${log}
            printf "empty but http_proxy isn't.\n" >> ${log}
        fi
    fi
}

function tryWget(){
    getProxyConf
    if test -z "$phost"; then
        PROXY=""
    else
        PROXY="http://${phost}:${pport}"
    fi

    PROXYPASSWD="--proxy-password"
    if which wget &> /dev/null; then
        WGETBIN="$(which wget)"
        WGETVERSION="$(${WGETBIN} --version | head -n1 | cut -d' ' -f3)"
        WGETVER1="$(echo ${WGETVERSION} | cut -d'.' -f1)"
        WGETVER2="$(echo ${WGETVERSION} | cut -d'.' -f2)"
        # If the system wget(1) is older than the 1.10 version, use
        # the option "--proxy-passwd" to pass the proxy password to wget(1)
        if test ${WGETVER1} -lt 1 -o ${WGETVER1} -eq 1 -a ${WGETVER2} -lt 10
        then
            PROXYPASSWD="--proxy-passwd"
        fi
    else
        WGETBIN="${PREFIX}/bin/wget"
    fi

    http_proxy="${PROXY}" ${WGETBIN} --tries=${UPDATETRIES} \
                                     --timeout=${UPDATETIMEOUT} \
                                     --proxy-user="${puid}" \
                                     ${PROXYPASSWD}="${ppasswd}" \
                                     $* || return 1
}

#------------------------------------------------------------------------------
# Function: getNetworkInterface
# Get the network interface which the client must bind to (in case there is
# more than one default route) and the collect will use to obtain the MAC
# address.
function getNetworkInterface()
{
    for interface in $(/sbin/route | grep default | awk '{print $NF}'); do
        # Send ICMP ECHO_REQUEST to root server I or J
        if ping -c 1 -I ${interface} 192.36.148.17 &> /dev/null ||
           ping -c 1 -I ${interface} 192.58.128.30 &> /dev/null ; then
            break
        fi
    done
}