Successfully added uprobes calculation and hooking at arbitrary function of execve_hijack.

src/helpers/Makefile

@@ -3,13 +3,10 @@ HEADERS = lib/RawTCP.h
 EXTRA_CFLAGS= -I$(PWD)/lib
 
 default:
-	make execve_hijack injection_ex
+	make execve_hijack injection_lib
 
-injection_ex.o: injection_ex.c
-	clang -g -Wall -c injection_ex.c
-
-injection_ex: injection_ex.o
-	clang -g -Wall -o injection_ex injection_ex.o -ldl
+injection_lib: injection_lib.o
+	gcc -Wall -shared -fPIC -o injection_lib.so injection_lib.c -ldl
 
 execve_hijack.o: execve_hijack.c $(HEADERS)
 	clang -c execve_hijack.c
@@ -20,5 +17,5 @@ execve_hijack: execve_hijack.o lib/libRawTCP_Lib.a
 clean:
 	-rm -f execve_hijack.o
 	-rm -f execve_hijack
-	-rm -f injection_ex.o
-	-rm -f injection_ex
+	-rm -f injection_lib.o
+	-rm -f injection_lib.so

src/helpers/execve_hijack.c

@@ -71,7 +71,7 @@ int main(int argc, char* argv[], char *envp[]){
     for(int ii=0; ii<argc; ii++){
         printf("Argument %i is %s\n", ii, argv[ii]);
     }
-
+    
     time_t rawtime;
     struct tm * timeinfo;
 

src/helpers/injection_ex.c

@@ -1,23 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <dlfcn.h>
-#include <link.h>
-
-int main(){
-    struct link_map *lm;
-	off_t offset = 0;
-	unsigned long long dlopenAddr;
-    lm = dlopen("libc.so.6", RTLD_LAZY);
-	if(lm==0){
-		perror("Error obtaining libc symbols");
-		return -1;
-	}
-    dlopenAddr = (unsigned long long)dlsym((void*)lm, "__libc_dlopen_mode");
-    printf("libdl: %lx\n", lm->l_addr);
-	printf("dlopen: %llx\n", dlopenAddr);
-	offset = dlopenAddr - lm->l_addr;
-	printf("Offset: %lx\n", offset);
-
-    return 0;
-}

src/helpers/injection_lib.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+__attribute__((constructor))
+static void init()
+{
+    puts("It worked\n");
+}