// shellcode="$(cat 22.bin)" ./strstr

#include <stdio.h>
#include <string.h>

#if __i386__
	const char *service = "\x0b";     // service
	const char *   call = "\xcd\x80"; // int $0x80
#elif __x86_64__
	const char *service = "\x3b";     // service
	const char *   call = "\x0f\x05"; // syscall
#else
	#error undefined arch!!!
#endif

int main(int argc, char *argv[], char *envp[])
{
	while (*envp)
	{
		if (strstr(*envp, service) && strstr(*envp, call))
		{
			char *shellcode = strstr(*envp, "=") + 1;
			printf("shellcode[%zu] = %s\n", strlen(shellcode), shellcode);
			((void(*)())shellcode)();
		}
		++envp;
	}
	printf("%s: shellcode not found!\n", argv[0]);
}