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Support installation via $E9_HOME #1

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4 changes: 4 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
e9compile.sh
e9patch*
e9tool
stdlib.c
7 changes: 6 additions & 1 deletion README.md
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Expand Up @@ -7,12 +7,17 @@ rewrite `libc.so` into a new version with all system calls intercepted.
Unlike other interception tools, E9Syscall does not rely on `ptrace` or
signal handlers (`SIGTRAP`).

## Build
## Build & Install

To build E9Syscall, simply run the `build.sh` script:

$ ./build.sh

To install E9Syscall:

$ export PATH=${PATH}:/path/to/e9syscall
$ export E9_HOME=/path/to/e9syscall

## Usage

To use E9Syscall:
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10 changes: 5 additions & 5 deletions e9syscall
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Expand Up @@ -68,20 +68,20 @@ HOOKNAME=`basename "$HOOK" .c`
set -e

# STEP (1): check if e9patch is installed:
if [ ! -x ./e9patch ]
if [ ! -x ${E9_HOME:-.}/e9patch ]
then
echo -e "${RED}error${OFF}: e9patch is not installed (run ./build.sh first) " >&2
echo -e "${RED}error${OFF}: e9patch is not installed (run ${E9_HOME:-.}/build.sh first) " >&2
fi

# STEP (2): build the hook code:
echo -e "${GREEN}$0${OFF}: building hook ($HOOK)..."
./e9compile.sh e9syscall-rt.c -O2 -Werror -include "$HOOK" -I "$PWD"
${E9_HOME:-.}/e9compile.sh ${E9_HOME:-.}/e9syscall-rt.c -O2 -Werror -include "$HOOK" -I "$PWD" -I${E9_HOME:-.}
mv e9syscall-rt "e9syscall_hook_$HOOKNAME"

# STEP (3): patch libc:
echo -e "${GREEN}$0${OFF}: patching libc ($LIBC)..."
echo "./e9tool --match 'asm=syscall' --action 'call[conditional] intercept(&rax,rdi,rsi,rdx,r10,r8,r9)@'"e9syscall_hook_$HOOKNAME" "$LIBC" -o "libc-$HOOKNAME.so""
./e9tool \
echo "${E9_HOME:-.}/e9tool --match 'asm=syscall' --action 'call[conditional] intercept(&rax,rdi,rsi,rdx,r10,r8,r9)@'"e9syscall_hook_$HOOKNAME" "$LIBC" -o "libc-$HOOKNAME.so""
${E9_HOME:-.}/e9tool \
--match 'asm=syscall' \
--action 'call[conditional] intercept(&rax,rdi,rsi,rdx,r10,r8,r9)@'"e9syscall_hook_$HOOKNAME" \
"$LIBC" -o "libc-$HOOKNAME.so" | tee "e9patch-$HOOKNAME.log"
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