[PATCH 7/8] oe-git-proxy.sh: Add a new comprehensive git proxy script

Darren Hart
2013-02-05T10:46:30Z

oe-git-proxy.sh is a simple tool to be used via GIT_PROXY_COMMAND. It
uses BSD netcat to make SOCKS5 or HTTPS proxy connections. It uses
ALL_PROXY to determine the proxy server, protocol, and port. It uses
NO_PROXY to skip using the proxy for a comma delimited list of hosts,
host globs (*.example.com), IPs, or CIDR masks (192.168.1.0/24). It is
known to work with both bash and dash shells.

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
scripts/oe-git-proxy.sh | 125 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 125 insertions(+), 0 deletions(-)
create mode 100755 scripts/oe-git-proxy.sh

diff --git a/scripts/oe-git-proxy.sh b/scripts/oe-git-proxy.sh
new file mode 100755
index 0000000..e12289d
--- /dev/null
+++ b/scripts/oe-git-proxy.sh
@@ -0,0 +1,125 @@
+#!/bin/sh
+
+# oe-git-proxy.sh is a simple tool to be via GIT_PROXY_COMMAND. It uses BSD netcat
+# to make SOCKS5 or HTTPS proxy connections. It uses ALL_PROXY to determine the
+# proxy server, protocol, and port. It uses NO_PROXY to skip using the proxy for
+# a comma delimited list of hosts, host globs (*.example.com), IPs, or CIDR masks
+# (192.168.1.0/24). It is known to work with both bash and dash shells.
+#
+# BSD netcat is provided by netcat-openbsd on Ubuntu and nc on Fedora.
+#
+# Example ALL_PROXY values:
+# ALL_PROXY=socks://socks.example.com:1080
+# ALL_PROXY=https://proxy.example.com:8080
+#
+# Copyright (c) 2013, Intel Corporation.
+# All rights reserved.
+#
+# AUTHORS
+# Darren Hart <dvhart@linux.intel.com>
+
+# Locate the netcat binary
+NC=$(which nc 2>/dev/null)
+if [ $? -ne 0 ]; then
+ echo "ERROR: nc binary not in PATH"
+ exit 1
+fi
+METHOD=""
+
+# Test for a valid IPV4 quad with optional bitmask
+valid_ipv4() {
+ echo $1 | egrep -q "^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}(/(3[0-2]|[1-2]?[0-9]))?$"
+ return $?
+}
+
+# Convert an IPV4 address into a 32bit integer
+ipv4_val() {
+ SHIFT=24
+ VAL=0
+ for B in $(echo "$1" | sed -e 's/\./ /g'); do
+ VAL=$(($VAL+$(($B<<$SHIFT))))
+ SHIFT=$(($SHIFT-8))
+ done
+ echo "$VAL"
+}
+
+# Determine if two IPs are equivalent, or if the CIDR contains the IP
+match_ipv4() {
+ CIDR=$1
+ IP=$2
+
+ if [ -z "${IP%%$CIDR}" ]; then
+ return 0
+ fi
+
+ # Determine the mask bitlength
+ BITS=${CIDR##*/}
+ if [ -z "$BITS" ]; then
+ return 1
+ fi
+
+ IPVAL=$(ipv4_val $IP)
+ IP2VAL=$(ipv4_val ${CIDR%%/*})
+
+ # OR in the unmasked bits
+ for i in $(seq 0 $((32-$BITS))); do
+ IP2VAL=$(($IP2VAL|$((1<<$i))))
+ IPVAL=$(($IPVAL|$((1<<$i))))
+ done
+
+ echo "$IPVAL vs. $IP2VAL"
+ if [ $IPVAL -eq $IP2VAL ]; then
+ return 0
+ fi
+ return 1
+}
+
+# Test to see if GLOB matches HOST
+match_host() {
+ HOST=$1
+ GLOB=$2
+
+ if [ -z "${HOST%%$GLOB}" ]; then
+ return 0
+ fi
+
+ # Match by netmask
+ if valid_ipv4 $GLOB; then
+ HOST_IP=$(gethostip -d $HOST)
+ if valid_ipv4 $HOST_IP; then
+ match_ipv4 $GLOB $HOST_IP
+ if [ $? -eq 0 ]; then
+ return 0
+ fi
+ fi
+ fi
+
+ return 1
+}
+
+# If no proxy is set, just connect directly
+if [ -z "$ALL_PROXY" ]; then
+ $NC -X connect $*
+ exit
+fi
+
+# Connect directly to hosts in NO_PROXY
+for H in $(echo "$NO_PROXY" | sed -e 's/,/ /g'); do
+ if match_host $1 $H; then
+ METHOD="-X connect"
+ break
+ fi
+done
+
+if [ -z "$METHOD" ]; then
+ # strip the protocol and the trailing slash
+ PROTO=$(echo $ALL_PROXY | sed -e 's/\([^:]*\):\/\/.*/\1/')
+ PROXY=$(echo $ALL_PROXY | sed -e 's/.*:\/\/\([^:]*:[0-9]*\).*/\1/')
+ if [ "$PROTO" = "socks" ]; then
+ METHOD="-X 5 -x $PROXY"
+ elif [ "$PROTO" = "https" ]; then
+ METHOD="-X connect -x $PROXY"
+ fi
+fi
+
+$NC $METHOD $*
--
1.7.5.4