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/* DHT boostrap
*
* A simple DHT boostrap server for tox.
*
* Build commands (use one or the other):
* gcc -O2 -Wall -D VANILLA_NACL -o bootstrap_server ../core/Lossless_UDP.c ../core/network.c ../core/net_crypto.c ../core/Messenger.c ../core/DHT.c ../core/friend_requests.c ../nacl/build/${HOSTNAME%.*}/lib/amd64/{cpucycles.o,libnacl.a,randombytes.o} DHT_bootstrap.c
*
* gcc -O2 -Wall -o bootstrap_server ../core/Lossless_UDP.c ../core/network.c ../core/net_crypto.c ../core/Messenger.c ../core/DHT.c ../core/friend_requests.c -lsodium DHT_bootstrap.c
*/
#include "../core/DHT.h"
#include "../core/friend_requests.h"
//Sleep function (x = milliseconds)
#ifdef WIN32
#define c_sleep(x) Sleep(1*x)
#else
#include <unistd.h>
#include <arpa/inet.h>
#define c_sleep(x) usleep(1000*x)
#endif
#define PORT 33445
unsigned char * hex_string_to_bin(char hex_string[])
{
unsigned char * val = malloc(strlen(hex_string));
char * pos = hex_string;
int i=0;
while(i < strlen(hex_string))
{
sscanf(pos,"%2hhx",&val[i]);
pos+=2;
i++;
}
return val;
}
void manage_keys()
{
const uint32_t KEYS_SIZE = crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
uint8_t keys[KEYS_SIZE];
FILE *keys_file = fopen("key", "r");
if (keys_file != NULL) {
//if file was opened successfully -- load keys
size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
if (read_size != KEYS_SIZE) {
printf("Error while reading the key file\nExiting.\n");
exit(1);
}
load_keys(keys);
printf("Keys loaded successfully\n");
} else {
//otherwise save new keys
new_keys();
save_keys(keys);
keys_file = fopen("key", "w");
if (fwrite(keys, sizeof(uint8_t), KEYS_SIZE, keys_file) != KEYS_SIZE) {
printf("Error while writing the key file.\nExiting.\n");
exit(1);
}
printf("Keys saved successfully\n");
}
fclose(keys_file);
}
int main(int argc, char *argv[])
{
manage_keys();
printf("Public key: ");
uint32_t i;
for(i = 0; i < 32; i++)
{
if(self_public_key[i] < 16)
printf("0");
printf("%hhX",self_public_key[i]);
}
printf("\n");
printf("Port: %u\n", PORT);
//initialize networking
//bind to ip 0.0.0.0:PORT
IP ip;
ip.i = 0;
init_networking(ip, PORT);
perror("Initialization");
if (argc > 3) {
printf("Trying to bootstrap into the network...\n");
IP_Port bootstrap_info;
bootstrap_info.ip.i = inet_addr(argv[1]);
bootstrap_info.port = htons(atoi(argv[2]));
uint8_t *bootstrap_key = hex_string_to_bin(argv[3]);
DHT_bootstrap(bootstrap_info, bootstrap_key);
free(bootstrap_key);
}
IP_Port ip_port;
uint8_t data[MAX_UDP_PACKET_SIZE];
uint32_t length;
int is_waiting_for_dht_connection = 1;
while(1)
{
if (is_waiting_for_dht_connection && DHT_isconnected())
{
printf("Connected to other bootstrap server successfully.\n");
is_waiting_for_dht_connection = 0;
}
doDHT();
while(receivepacket(&ip_port, data, &length) != -1)
{
DHT_handlepacket(data, length, ip_port);
friendreq_handlepacket(data, length, ip_port);
}
c_sleep(1);
}
shutdown_networking();
return 0;
}
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