tetatet/src/main.c

#include <portaudio.h>
#include <sodium/core.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>

// #include "audio.h"
#include "crypt.h"
#include "net.h"

#define CHANNELS 1
#define SAMPLE_RATE 48000
#define FRAMES_PER_BUFFFER 960

#define BUF_SIZE (FRAMES_PER_BUFFFER * CHANNELS)

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

    crypt_key_t kl, kr;
    unsigned char *hl, *hr;
    unsigned char hlr[CRYPT_HELLO_LEN], hrl[CRYPT_HELLO_LEN];
    unsigned char *nonce;
    net_t nl, nr;
    crypt_session_t sl, sr;

    const int incom_len = 512;
    char incom[incom_len];

    int ret = 0;

    if (sodium_init() == -1) {
        fprintf(stderr, "A Sodium cryptography library is failed to initialise!\n");
        return -1;
    }

    // if (audio_init_soundsystem() == -1)
    //     return -1;

    if (crypt_key_gen(&kl) == -1) {
        ret = -1;
        goto cleanup;
    }

    if (crypt_key_gen(&kr) == -1) {
        ret = -1;
        goto cleanup;
    }

    hl = crypt_hello(&kl);
    hr = crypt_hello(&kr);


    if (net_client_init(&nl, "127.0.0.1", "14816") == -1) {
        fprintf(stderr, "Failed to intialise a client.");
        ret = -1;
        goto cleanup;
    }

    if (net_server_init(&nr, "127.0.0.1", "14816") == -1) {
        fprintf(stderr, "Failed to intialise a server.");
        ret = -1;
        goto cleanup;
    }

    ssize_t sent = net_send(&nl, (const char *)hl, CRYPT_HELLO_LEN);
    if (sent == -1) {
        ret = -1;
        goto cleanup;
    }

    ssize_t rcvd = net_recv(&nr, incom, incom_len);
    if (rcvd == -1) {
        ret = -1;
        goto cleanup;
    }

    if (rcvd == CRYPT_HELLO_LEN) {
        memcpy(hrl, incom, CRYPT_HELLO_LEN);
    }

    sent = net_send(&nl, (const char *)hl, CRYPT_HELLO_LEN);
    if (sent == -1) {
        ret = -1;
        goto cleanup;
    }

    rcvd = net_recv(&nr, incom, incom_len);
    if (rcvd == -1) {
        ret = -1;
        goto cleanup;
    }
    // fprintf(stderr, "%s:%d\n", __FILE__, __LINE__);

    if (rcvd == CRYPT_HELLO_LEN) {
        memcpy(hrl, incom, CRYPT_HELLO_LEN);
        nr.raddr = nr.inaddr;
        nr.raddr_len = nr.inaddr_len;
    } else {
        fprintf(stderr, "A broken hello packet was received.");
        ret = -1;
        goto cleanup;
    }

    sent = net_send(&nr, (const char *)hr, CRYPT_HELLO_LEN);
    if (sent == -1) {
        ret = -1;
        goto cleanup;
    }

    rcvd = net_recv(&nl, incom, incom_len);
    if (rcvd == -1) {
        ret = -1;
        goto cleanup;
    }
    // fprintf(stderr, "%s:%d\n", __FILE__, __LINE__);

    if (rcvd == CRYPT_HELLO_LEN) {
        memcpy(hlr, incom, CRYPT_HELLO_LEN);
        nl.raddr = nl.inaddr;
        nl.raddr_len = nl.inaddr_len;
    } else {
        fprintf(stderr, "A broken hello packet was received.");
        ret = -1;
        goto cleanup;
    }

    if (crypt_hello_verify(hlr, &kr) == -1) {
        fprintf(stderr, "hello remote -> local: not verified\n");
        ret = -1;
        goto cleanup;
    }

    if (crypt_hello_verify(hrl, &kl) == -1) {
        fprintf(stderr, "hello local -> remote: not verified\n");
        ret = -1;
        goto cleanup;
    }

    nonce = crypt_hello_get_nonce(hl, hlr, true);
    unsigned char *rn = crypt_hello_get_nonce(hr, hrl, false);

    if (memcmp(nonce, rn, CRYPT_NONCE_LEN) != 0) {
        fprintf(stderr, "nonce mismatch occured\n");
        free(rn);
        ret = -1;
        goto cleanup;
    }

    if (crypt_session_init(&sl, &kl, &kr, nonce, true) == -1) {
        fprintf(stderr, "local session init fail\n");
        ret = -1;
        goto cleanup;
    }

    if (crypt_session_init(&sr, &kr, &kl, nonce, false) == -1) {
        fprintf(stderr, "remote session init fail\n");
        ret = -1;
        goto cleanup;
    }

    /* Now we're talking securely! */


cleanup:

    net_destroy(&nl);
    net_destroy(&nr);

    crypt_key_destroy(&kl);
    crypt_key_destroy(&kr);

    crypt_session_destroy(&sl);
    crypt_session_destroy(&sr);

    free(hl);
    free(hr);
    free(nonce);

    // if (audio_terminate_soundsystem() == -1)
    //     return -1;

    return ret;
}