radius2 1.0.3

a fast symbolic execution framework using r2
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use crate::value::Value;
use crate::state::State;

pub mod libc;
pub mod fs;
pub mod syscall;

pub type SimMethod = fn (&mut State, &[Value]) -> Value;

pub struct Sim {
    pub symbol: String,
    pub function: SimMethod,
    pub arguments: usize
}

pub fn make_sim(symbol: &str, function: SimMethod,
    arguments: usize) -> Sim {
    
    Sim {symbol: String::from(symbol), function, arguments}
}

pub fn error(_state: &mut State, _args: &[Value]) -> Value {
    Value::Concrete(-1i64 as u64, 0)
}

pub fn zero(_state: &mut State, _args: &[Value]) -> Value {
    Value::Concrete(0, 0)
}

// this isn't great
pub fn unconstrained(state: &mut State, _args: &[Value]) -> Value {
    let mut uncon_vec = state.context.entry("uncon".to_owned()).or_insert(vec!()).clone();
    let uncon = state.symbolic_value(&format!("uncon_{}", uncon_vec.len()), 64);
    uncon_vec.push(uncon.clone());
    state.context.insert("uncon".to_owned(), uncon_vec);
    uncon
}

// get a vec of all available Sims
pub fn get_sims() -> Vec<Sim> {
    vec!(
        make_sim("puts",    libc::puts, 1),
        make_sim("gets",    libc::gets, 1),
        make_sim("putchar", libc::putchar, 1),
        make_sim("putwchar",libc::putchar, 1),
        make_sim("getchar", libc::getchar, 0),
        make_sim("fgets",   libc::fgets, 1),
        make_sim("printf",  libc::printf, 1), // fix
        make_sim("fflush",  libc::fflush, 0),

        make_sim("fopen",   libc::fopen, 2),
        make_sim("fread",   libc::fread, 4),
        make_sim("fwrite",  libc::fwrite, 4),
        make_sim("fseek",   libc::fseek, 2),
        make_sim("fclose",   libc::fgets, 1),

        make_sim("strlen",  libc::strlen, 1),
        make_sim("strnlen", libc::strnlen, 2),
        make_sim("strstr",  libc::strstr, 2),
        make_sim("strcpy",  libc::strcpy, 2),
        make_sim("strncpy", libc::strncpy, 3),
        make_sim("strcat",  libc::strcat, 2),
        make_sim("strncat", libc::strncat, 3),
        make_sim("strdup",  libc::strdup, 1),
        make_sim("strndup", libc::strndup, 2),
        make_sim("strdupa", libc::strdupa, 1),
        make_sim("strndupa",libc::strndupa, 2),
        make_sim("strfry",  libc::strfry, 1),
        make_sim("strchr",  libc::strchr, 2),
        make_sim("strrchr", libc::strrchr, 2),
        make_sim("strstr",  libc::strstr, 2),
        make_sim("strcmp",  libc::strcmp, 2),
        make_sim("strncmp", libc::strncmp, 3),

        make_sim("memmove", libc::memmove, 3),
        make_sim("memcpy",  libc::memcpy, 3),
        make_sim("memccpy", libc::memccpy, 3),
        make_sim("mempcpy", libc::mempcpy, 3),
        make_sim("memfrob", libc::memfrob, 2),
        make_sim("memset",  libc::memset, 3),
        make_sim("memchr",  libc::memchr, 3),
        make_sim("memrchr", libc::memrchr, 3),
        make_sim("memcmp",  libc::memcmp, 3),
        make_sim("memmem",  libc::memmem, 3),

        make_sim("bcopy",   libc::bcopy, 3),
        make_sim("bzero",   libc::bzero, 2),

        make_sim("malloc",  libc::malloc, 1),
        make_sim("calloc",  libc::calloc, 2),
        make_sim("free",    libc::strnlen, 1),

        make_sim("mmap",    libc::mmap, 4),
        make_sim("munmap",  libc::munmap, 2),

        make_sim("brk",     libc::brk, 1),
        make_sim("sbrk",    libc::sbrk, 1),

        make_sim("atoi", libc::atoi, 1),
        make_sim("atol", libc::atoi, 1),
        make_sim("itoa", libc::itoa, 3),

        make_sim("strtol", libc::strtol, 3),
        make_sim("strtoll", libc::strtol, 3),
        make_sim("strtod", libc::strtol, 3),

        make_sim("islower", libc::islower, 1),
        make_sim("isupper", libc::isupper, 1),
        make_sim("isalpha", libc::isalpha, 1),
        make_sim("isdigit", libc::isdigit, 1),
        make_sim("isalnum", libc::isalnum, 1),
        make_sim("iscntrl", libc::iscntrl, 1),
        make_sim("isblank", libc::isblank, 1),
        make_sim("tolower", libc::tolower, 1),
        make_sim("toupper", libc::toupper, 1),

        make_sim("open",    libc::open, 3),
        make_sim("close",   libc::close, 1),
        make_sim("read",    libc::read, 3),
        make_sim("write",   libc::write, 3),
        make_sim("lseek",   libc::lseek, 2),
        make_sim("access",  libc::access, 1),
        make_sim("stat",    libc::stat, 2),
        make_sim("fstat",   libc::fstat, 2),
        make_sim("lstat",   libc::lstat, 2),

        make_sim("getuid",  libc::getuid, 0),
        make_sim("getgid",  libc::getgid, 0),
        make_sim("geteuid", libc::geteuid, 0),
        make_sim("getegid", libc::getegid, 0),

        make_sim("sleep",   libc::sleep, 1),
        make_sim("getpid",  libc::getpid, 0),
        make_sim("fork",    libc::fork, 0),
        make_sim("ptrace",  libc::ptrace, 0),
        make_sim("syscall", libc::c_syscall, 0),
        make_sim("getenv",  libc::getenv, 1),
        make_sim("exit",    libc::exit, 1),

        make_sim("ioctl",  error, 1),
        make_sim("sysctl", zero, 1),

        make_sim("rand",   libc::rand, 0),
        make_sim("srand",  libc::srand, 1),

        make_sim("gethostname", libc::gethostname, 0),
        make_sim("getpagesize", libc::getpagesize, 0),

        make_sim("__libc_start_main", libc::__libc_start_main, 5)
    )
}