dlcall

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

char*
parse_arg( char* string )
{
    if(!strncmp( string, "(int)", 5 ))
    {
        if(!strncmp( string+5, "0x", 2 ))
            return (char*)strtol( string+7, NULL, 16 );
        else
            return (char*)atoi( string );
    }
    else
        return string;
}

int
main(int argc,char **argv)
{
    FILE* dll;
    void* (*sym)();

    int i, j;
    int ret = -1;

    if(!argv[1])
        return 1;

    dll = dlopen( "libc.so.6", RTLD_GLOBAL | RTLD_NOW);
    sym = dlsym( dll, argv[1] );

    for(i = 0;i < argc - 2;i++)
        argv[i + 2] = parse_arg( argv[i + 2] );

    for(i = 0,j = 0;i < argc - 2;i++, j += 4)
        //printf("movl %p, (%%esp,%d)\n", (parse_arg(argv[i + 2])), (j) );
        asm("movl %0, (%%esp,%1)" : :"r"(argv[i + 2]), "r"(j) );

    asm("call *%0" : :"r"(sym));
    asm("movl %%eax,%0" :"=r"(ret));

    printf("ret: %d ( 0x%08x )\n", ret, ret );

    return 0;
}