#!/bin/bash
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# oe-git-proxy is a simple tool to be via GIT_PROXY_COMMAND. It uses socat
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# to make SOCKS5 or HTTPS proxy connections.
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# It uses ALL_PROXY or all_proxy or http_proxy to determine the proxy server,
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# protocol, and port.
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# It uses NO_PROXY to skip using the proxy for a comma delimited list of
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# hosts, host globs (*.example.com), IPs, or CIDR masks (192.168.1.0/24). It
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# is known to work with both bash and dash shells.
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#
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# Example ALL_PROXY values:
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# ALL_PROXY=socks://socks.example.com:1080
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# ALL_PROXY=https://proxy.example.com:8080
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#
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# Copyright (c) 2013, Intel Corporation.
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#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# AUTHORS
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# Darren Hart <dvhart@linux.intel.com>
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# disable pathname expansion, NO_PROXY fields could start with "*" or be it
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set -f
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if [ $# -lt 2 -o "$1" = '--help' -o "$1" = '-h' ] ; then
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echo 'oe-git-proxy: error: the following arguments are required: host port'
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echo 'Usage: oe-git-proxy host port'
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echo ''
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echo 'OpenEmbedded git-proxy - a simple tool to be used via GIT_PROXY_COMMAND.'
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echo 'It uses socat to make SOCKS or HTTPS proxy connections.'
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echo 'It uses ALL_PROXY to determine the proxy server, protocol, and port.'
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echo 'It uses NO_PROXY to skip using the proxy for a comma delimited list'
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echo 'of hosts, host globs (*.example.com), IPs, or CIDR masks (192.168.1.0/24).'
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echo 'It is known to work with both bash and dash shells.runs native tools'
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echo ''
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echo 'arguments:'
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echo ' host proxy host to use'
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echo ' port proxy port to use'
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echo ''
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echo 'options:'
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echo ' -h, --help show this help message and exit'
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echo ''
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exit 2
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fi
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# Locate the netcat binary
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if [ -z "$SOCAT" ]; then
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SOCAT=$(which socat 2>/dev/null)
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if [ $? -ne 0 ]; then
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echo "ERROR: socat binary not in PATH" 1>&2
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exit 1
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fi
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fi
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METHOD=""
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# Test for a valid IPV4 quad with optional bitmask
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valid_ipv4() {
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echo $1 | egrep -q "^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}(/(3[0-2]|[1-2]?[0-9]))?$"
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return $?
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}
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# Convert an IPV4 address into a 32bit integer
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ipv4_val() {
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IP="$1"
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SHIFT=24
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VAL=0
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for B in $( echo "$IP" | tr '.' ' ' ); do
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VAL=$(($VAL+$(($B<<$SHIFT))))
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SHIFT=$(($SHIFT-8))
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done
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echo "$VAL"
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}
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# Determine if two IPs are equivalent, or if the CIDR contains the IP
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match_ipv4() {
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CIDR=$1
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IP=$2
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if [ -z "${IP%%$CIDR}" ]; then
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return 0
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fi
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# Determine the mask bitlength
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BITS=${CIDR##*/}
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[ "$BITS" != "$CIDR" ] || BITS=32
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if [ -z "$BITS" ]; then
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return 1
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fi
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IPVAL=$(ipv4_val $IP)
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IP2VAL=$(ipv4_val ${CIDR%%/*})
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# OR in the unmasked bits
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for i in $(seq 0 $((32-$BITS))); do
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IP2VAL=$(($IP2VAL|$((1<<$i))))
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IPVAL=$(($IPVAL|$((1<<$i))))
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done
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if [ $IPVAL -eq $IP2VAL ]; then
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return 0
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fi
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return 1
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}
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# Test to see if GLOB matches HOST
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match_host() {
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HOST=$1
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GLOB=$2
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if [ -z "${HOST%%*$GLOB}" ]; then
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return 0
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fi
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# Match by netmask
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if valid_ipv4 $GLOB; then
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for HOST_IP in $(getent ahostsv4 $HOST | grep ' STREAM ' | cut -d ' ' -f 1) ; do
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if valid_ipv4 $HOST_IP; then
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match_ipv4 $GLOB $HOST_IP
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if [ $? -eq 0 ]; then
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return 0
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fi
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fi
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done
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fi
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return 1
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}
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# If no proxy is set or needed, just connect directly
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METHOD="TCP:$1:$2"
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[ -z "${ALL_PROXY}" ] && ALL_PROXY=$all_proxy
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[ -z "${ALL_PROXY}" ] && ALL_PROXY=$http_proxy
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if [ -z "$ALL_PROXY" ]; then
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exec $SOCAT STDIO $METHOD
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fi
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# Connect directly to hosts in NO_PROXY
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for H in $( echo "$NO_PROXY" | tr ',' ' ' ); do
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if match_host $1 $H; then
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exec $SOCAT STDIO $METHOD
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fi
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done
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# Proxy is necessary, determine protocol, server, and port
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# extract protocol
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PROTO=${ALL_PROXY%://*}
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# strip protocol:// from string
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ALL_PROXY=${ALL_PROXY#*://}
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# extract host & port parts:
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# 1) drop username/password
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PROXY=${ALL_PROXY##*@}
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# 2) remove optional trailing /?
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PROXY=${PROXY%%/*}
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# 3) extract optional port
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PORT=${PROXY##*:}
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if [ "$PORT" = "$PROXY" ]; then
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PORT=""
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fi
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# 4) remove port
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PROXY=${PROXY%%:*}
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# extract username & password
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PROXYAUTH="${ALL_PROXY%@*}"
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[ "$PROXYAUTH" = "$ALL_PROXY" ] && PROXYAUTH=
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[ -n "${PROXYAUTH}" ] && PROXYAUTH=",proxyauth=${PROXYAUTH}"
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if [ "$PROTO" = "socks" ] || [ "$PROTO" = "socks4a" ]; then
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if [ -z "$PORT" ]; then
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PORT="1080"
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fi
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METHOD="SOCKS4A:$PROXY:$1:$2,socksport=$PORT"
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elif [ "$PROTO" = "socks4" ]; then
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if [ -z "$PORT" ]; then
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PORT="1080"
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fi
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METHOD="SOCKS4:$PROXY:$1:$2,socksport=$PORT"
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else
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# Assume PROXY (http, https, etc)
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if [ -z "$PORT" ]; then
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PORT="8080"
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fi
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METHOD="PROXY:$PROXY:$1:$2,proxyport=${PORT}${PROXYAUTH}"
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fi
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exec $SOCAT STDIO "$METHOD"
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