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authorNiklas Baumstark <niklas.baumstark@gmail.com>2015-03-17 18:36:39 +0100
committerNiklas Baumstark <niklas.baumstark@gmail.com>2015-03-17 18:36:39 +0100
commitdd3e6de7a7091cf32db9a378b0c251ba9dd37011 (patch)
treed1c269e532af62b1c1ed251411b654ab6bf30aeb /common
parentd915d779a6d1fbb7a11c98cbf70209ca09df9e26 (diff)
downloadlibc-database-dd3e6de7a7091cf32db9a378b0c251ba9dd37011.tar.gz
libc-database-dd3e6de7a7091cf32db9a378b0c251ba9dd37011.zip
allow adding local libraries
Diffstat (limited to 'common')
-rw-r--r--common/libc.sh111
1 files changed, 111 insertions, 0 deletions
diff --git a/common/libc.sh b/common/libc.sh
new file mode 100644
index 0000000..4d27b6d
--- /dev/null
+++ b/common/libc.sh
@@ -0,0 +1,111 @@
+#!/bin/bash
+
+mkdir -p tmp db
+
+die() {
+ echo >&2 $1
+ exit 1
+}
+
+dump_symbols() {
+ readelf -Ws $1 | perl -n -e '/: (\w*).*?(\w+)@@GLIBC_/ && print "$2 $1\n"'
+}
+
+extract_label() {
+ perl -n -e '/(\w+)/ && print $1'
+}
+
+dump_libc_start_main_ret() {
+ local call_main=`objdump -D $1 \
+ | grep -A 100 '<__libc_start_main>' \
+ | grep call \
+ | grep -B 1 '<exit>' \
+ | head -n 1 \
+ | extract_label`
+ local offset=`objdump -D $1 | egrep -A 1 "(^| )$call_main:" | tail -n 1 | extract_label`
+ if [[ "$offset" != "" ]]; then
+ echo "__libc_start_main_ret $offset"
+ fi
+}
+
+dump_bin_sh() {
+ local offset=`strings -a -t x $1 | grep '/bin/sh' | extract_label`
+ if [[ "$offset" != "" ]]; then
+ echo "str_bin_sh $offset"
+ fi
+}
+
+process_libc() {
+ local libc=$1
+ local id=$2
+ local info=$3
+ echo " -> Writing libc to db/${id}.so"
+ cp $libc db/${id}.so
+ echo " -> Writing symbols to db/${id}.symbols"
+ (dump_symbols $libc; dump_libc_start_main_ret $libc; dump_bin_sh $libc) \
+ > db/${id}.symbols
+ echo " -> Writing version info"
+ echo "$info" > db/${id}.info
+}
+
+check_id() {
+ local id=$1
+ if [[ -e db/${id}.info ]]; then
+ echo " -> Already have this version, 'rm db/${id}.*' to force"
+ return 1
+ fi
+ return 0
+}
+
+# ===== Ubuntu ===== #
+
+get_ubuntu() {
+ local url="$1"
+ local info="$2"
+ echo "Getting $info"
+ echo " -> Location: $url"
+ local id=`echo $url | perl -n -e '/(libc6[^\/]*)\./ && print $1'`
+ echo " -> ID: $id"
+ check_id $id || return
+ echo " -> Downloading package"
+ rm -rf tmp/*
+ wget $url 2>/dev/null -O tmp/pkg.deb || die "Failed to download package from $url"
+ echo " -> Extracting package"
+ cd tmp
+ ar x pkg.deb || die "ar failed"
+ tar xf data.tar.* || die "tar failed"
+ cd ..
+ local libc=`find tmp -name libc.so.6 || die "Cannot locate libc.so.6"`
+ process_libc $libc $id $info
+}
+
+get_current_ubuntu() {
+ local version=$1
+ local arch=$2
+ local pkg=$3
+ local info=ubuntu-$version-$arch-$pkg
+ echo "Getting package location for ubuntu-$version-$arch"
+ local url=`(wget http://packages.ubuntu.com/$version/$arch/$pkg/download -O - 2>/dev/null \
+ | grep -oh 'http://[^"]*libc6[^"]*.deb') || die "Failed to get package version"`
+ get_ubuntu $url $info
+}
+
+get_all_ubuntu() {
+ local info=$1
+ local url=$2
+ for f in `wget $url/ -O - 2>/dev/null | egrep -oh 'libc6(-i386|-amd64)?_[^"]*' |grep -v "</a>"`; do
+ get_ubuntu $url/$f $1
+ done
+}
+
+# ===== Local ===== #
+
+add_local() {
+ local libc=$1
+ [[ -e $libc ]] || return
+ local info="local"
+ local id="local-`sha1sum $libc`"
+ echo "Adding local libc $libc (id $id)"
+ check_id $id || return
+ process_libc $libc $id $info
+}