void forwarding_actor_proxy::enqueue(mailbox_element_ptr what,
execution_unit*) {
CAF_PUSH_AID(0);
CAF_ASSERT(what);
forward_msg(std::move(what->sender), what->mid,
what->move_content_to_message(), &what->stages);
}
bool forwarding_actor_proxy::link_impl(linking_operation op,
abstract_actor* other) {
switch (op) {
case establish_link_op:
if (establish_link_impl(other)) {
// causes remote actor to link to (proxy of) other
// receiving peer will call: this->local_link_to(other)
forward_msg(ctrl(), invalid_message_id,
make_message(link_atom::value, other->address()));
return true;
}
break;
case remove_link_op:
if (remove_link_impl(other)) {
// causes remote actor to unlink from (proxy of) other
forward_msg(ctrl(), invalid_message_id,
make_message(unlink_atom::value, other->address()));
return true;
}
break;
case establish_backlink_op:
if (establish_backlink_impl(other)) {
// causes remote actor to unlink from (proxy of) other
forward_msg(ctrl(), invalid_message_id,
make_message(link_atom::value, other->address()));
return true;
}
break;
case remove_backlink_op:
if (remove_backlink_impl(other)) {
// causes remote actor to unlink from (proxy of) other
forward_msg(ctrl(), invalid_message_id,
make_message(unlink_atom::value, other->address()));
return true;
}
break;
}
return false;
}
bool remote_actor_proxy::link_impl(linking_operation op,
const actor_addr& other) {
switch (op) {
case establish_link_op:
if (establish_link_impl(other)) {
// causes remote actor to link to (proxy of) other
// receiving peer will call: this->local_link_to(other)
forward_msg(address(), invalid_message_id,
make_message(atom("_Link"), other));
return true;
}
return false;
case remove_link_op:
if (remove_link_impl(other)) {
// causes remote actor to unlink from (proxy of) other
forward_msg(address(), invalid_message_id,
make_message(atom("_Unlink"), other));
return true;
}
return false;
case establish_backlink_op:
if (establish_backlink_impl(other)) {
// causes remote actor to unlink from (proxy of) other
forward_msg(address(), invalid_message_id,
make_message(atom("_Link"), other));
return true;
}
return false;
case remove_backlink_op:
if (remove_backlink_impl(other)) {
// causes remote actor to unlink from (proxy of) other
forward_msg(address(), invalid_message_id,
make_message(atom("_Unlink"), other));
return true;
}
return false;
}
return false;
}
void remote_actor_proxy::enqueue(const actor_addr& sender, message_id mid,
message m, execution_unit*) {
forward_msg(sender, mid, std::move(m));
}
int main(int argc, char ** argv) {
int ec_fifo, ce_fifo, es_fifo, se_fifo;
FILE* fp;
ssize_t msg_size;
uint8_t *buff;
char client_nm[NM_LENGTH], client_nm_tmp[NM_LENGTH];
uint8_t rsa_tmp[RSA_LENGTH], rsa_tmp2[RSA_LENGTH];
BIGNUM /**bn_n, *bn_d,*/ *bn_client_e, *bn_client_n, *bn_r;
char client_cipher_suite;
uint8_t sym_id, hash_id, public_id;
uint8_t k[K_SIZE] = {0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1};
int i, done;
int k_len, c_hex_len, c_len;
uint8_t g[HASH_LENGTH], g1[HASH_LENGTH];
uint8_t c[MSG_SIZE_MAX];
unsigned int tmp;
assert(K_SIZE == 8);
bn_client_e = BN_new();
bn_client_n = BN_new();
bn_r = BN_new();
/* Mandatory arguments */
if (!argv[1] || !argv[2] || !argv[3] || !argv[4] ||
!argv[1] || !argv[2] || !argv[3] || !argv[4]) {
fprintf(stderr, "%s [server->eve fifo] [eve->server fifo] [eve->client fifo] [client->eve fifo]\n", argv[0]);
exit(1);
}
se_fifo = open_channel(argv[1]);
es_fifo = open_channel(argv[2]);
ec_fifo = open_fifo(argv[3]);
ce_fifo = open_fifo(argv[4]);
/* wait real client to connect */
fprintf(stderr,"(E) Waiting connection...\n");
if (wait_connection(ce_fifo) < 0) {
fprintf(stderr,"(E) Communication error...\n");
goto next;
}
/* connect to server */
write_msg(es_fifo, (const u_int8_t *)CONNECTION_STRING, strlen(CONNECTION_STRING));
forward_string(se_fifo, ec_fifo, OK_STRING);
/* Server authentication */
/* client challange */
forward_msg(ce_fifo, es_fifo);
/* server response to challange */
forward_msg(se_fifo, ec_fifo);
/* Client authentication */
/* Client name */
msg_size = forward_msg_read(ce_fifo, es_fifo, &buff);
/* vvvv copy-paste from server vvvv */
buff[msg_size] = '\0';
strncpy((char *)client_nm, (const char *) buff, NM_LENGTH);
/* EXTRACT from (names[],c_puk[],n[]) the pair (c_puk[i],n[i]) where names[i] = nm */
if ((fp = fopen("server_folder/clients_rsa64_public_keys.txt", "r")) == NULL) {
fprintf(stderr, "Error while getting clients RSA public keys...\n");
goto next;
}
done = 0;
while (!feof(fp)) {
fscanf(fp, "%129s %129s %129s", client_nm_tmp, rsa_tmp, rsa_tmp2);
if (strcmp(client_nm_tmp, client_nm) == 0) {
done = 1;
break;
}
}
if (done == 0) {
fprintf(stderr, "Error: unrecognized client\n");
goto next;
}
fclose(fp);
BN_hex2bn(&bn_client_n, (const char *) rsa_tmp);
BN_hex2bn(&bn_client_e, (const char *) rsa_tmp2);
/* ^^^^ copy-paste from server ^^^^ */
/* now I know client name and pub key */
/* server challange */
forward_msg(se_fifo, ec_fifo);
/* client response */
forward_msg(ce_fifo, es_fifo);
/* Negotiation of the cipher suite */
/* cipher suite c -> s */
forward_msg_read(ce_fifo, es_fifo, &buff);
/* vvvv copy-paste from server vvvv */
client_cipher_suite = buff[0];
cipher_suite_table(client_cipher_suite, &sym_id, &hash_id, &public_id);
/* ^^^^ copy-paste from server ^^^^ */
/* Negotiation of the private key */
/* k already set as an arbitrary key */
/* vvvv copy-paste from server vvvv */
if (sym_id == 1) {
k_len = 3;
}
else {
k_len = K_SIZE;
}
BN_bin2bn(k, k_len, bn_r);
/* If we're using RSA512 read the correct key (we have the 64bit one) */
if (public_id == 6) {
if ((fp = fopen("server_folder/clients_rsa512_public_keys.txt", "r")) == NULL) {
fprintf(stderr, "Error while getting clients RSA public keys...\n");
goto next;
}
done = 0;
while (!feof(fp)) {
fscanf(fp, "%129s %129s %129s", client_nm_tmp, rsa_tmp, rsa_tmp2);
if (strcmp(client_nm_tmp, client_nm) == 0) {
done = 1;
break;
}
}
if (done == 0) {
fprintf(stderr, "Error: unrecognized client\n");
goto next;
}
fclose(fp);
BN_hex2bn(&bn_client_n, (const char *) rsa_tmp);
BN_hex2bn(&bn_client_e, (const char *) rsa_tmp2);
}
/* ENCRYPT key */
rsa_encrypt(bn_r, bn_client_e, bn_client_n);
/* WRITE encrypted k to C */
buff = (uint8_t *) BN_bn2hex(bn_r);
if ((write_msg(ec_fifo, buff, strlen((char *) buff))) < 0) {
fprintf(stderr, "Error while sending C to the client...\n");
goto next;
}
OPENSSL_free(buff);
/* Encrypted communication */
if ((msg_size = read_msg(ce_fifo,&buff)) < 0) {
fprintf(stderr, "Error while reading message from the client...\n");
goto next;
}
c_hex_len = msg_size - HASH_LENGTH * 2;
if (c_hex_len <= 0) {
fprintf(stderr, "Error, malformed message...\n");
goto next;
}
c_len = c_hex_len / 2;
for (i=0; i<msg_size; i+=2) {
if (i < c_hex_len) {
sscanf((char *) (buff+i), "%02x", &tmp);
c[i/2] = (uint8_t) tmp;
}
else {
sscanf((char *) (buff+i), "%02x", &tmp);
g[(i - c_hex_len) / 2] = (uint8_t) tmp;
}
}
/* Decrypt C */
decrypt(sym_id, c, c_len, k);
/* COMPUTE G' = H(M) */
sponge_hash(c, c_len, g1);
c[c_len] = '\0';
/* CHECK G' = G */
done = 1;
for (i=0; i<HASH_LENGTH; i++) {
if (g[i] != g1[i]) {
done = 0;
}
}
/* If the check fails print error message */
if (done == 0) {
if ((write_msg(ec_fifo, (uint8_t *) CORRUPTED_STRING, strlen(CORRUPTED_STRING))) < 0) {
fprintf(stderr, "Error while writing to the client...\n");
goto next;
}
}
/* PUT M' on a file */
if ((fp = fopen("eve_folder/received_messages.txt", "a+")) == NULL) {
fprintf(stderr, "Error while saving message...\n");
fclose(fp);
goto next;
}
fprintf(fp, "%s", c);
fflush(stdout);
fprintf(stdout, "MESSAGGIO SEGRETO >>>%s<<< FINE MESSAGGIO SEGRETO\n", c);
fflush(stdout);
fclose(fp);
/* WRITE ok message to C */
if ((write_msg(ec_fifo, (uint8_t *) DECRYPTED_STRING, strlen(DECRYPTED_STRING))) < 0) {
fprintf(stderr, "Error while writing C to the client...\n");
goto next;
}
/* ^^^^ copy-paste from server ^^^^ */
next:
/*close_channels ...!*/
BN_free(bn_client_n);
BN_free(bn_client_e);
BN_free(bn_r);
exit(0);
}
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("Usage: $ ./server 1234\n");
exit(0);
}
int sevrfd;
int peerfd[MAX_CLIENT];
char *peername[MAX_CLIENT];
char *peerip[MAX_CLIENT];
struct sockaddr_in sevr_addr;
struct sockaddr_in peer_addr;
char buf[MAX_BUF];
char buf2[MAX_BUF];
bzero(buf, MAX_BUF);
bzero(buf2, MAX_BUF);
//SO_REUSEADDR
int optval = 1;
setsockopt(sevrfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
//sevr_addr
bzero(&sevr_addr, sizeof(sevr_addr));
sevr_addr.sin_family = AF_INET;
sevr_addr.sin_port = htons((uint16_t)atoi(argv[1]));
sevr_addr.sin_addr.s_addr = htonl(INADDR_ANY);
//server socket
if ( (sevrfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
perror("create sevrfd socket.");
exit(1);
}
//bind
if ( bind(sevrfd, (struct sockaddr *) &sevr_addr, sizeof(sevr_addr)) < 0 )
{
perror("bind sevrfd.");
exit(1);
}
//listen
if ( listen(sevrfd, 5) < 0 )
{
perror("listen.");
exit(1);
}
printf("------ Chat Room Server Started ------\n");
int i, j, result, maxfd, newfd;
struct timeval tv;
fd_set rset;
socklen_t peer_addr_len;
char ipstr[30];
peer_addr_len = sizeof(peer_addr);
bzero(&peer_addr, peer_addr_len);
int conn_clients = 0;
for(i=0; i<MAX_CLIENT; i++)
{
peerfd[i] = 0;
peername[i] = NULL;
peerip[i] = NULL;
}
while(1)
{
FD_ZERO(&rset);
FD_SET(0, &rset);
FD_SET(sevrfd, &rset);
maxfd = MAX(maxfd, sevrfd);
tv.tv_sec = 1;
tv.tv_usec = 0;
for(i=0; i<MAX_CLIENT; i++)
{
if (peerfd[i] != 0)
{
FD_SET(peerfd[i], &rset);
maxfd = MAX(maxfd, peerfd[i]);
}
}
if ( select(maxfd+1, &rset, NULL, NULL, &tv) < 0 )
{
perror("select");
exit(1);
}
//peerfd[]
for(i=0; i<MAX_CLIENT; i++)
{
if(peerfd[i] != 0 && FD_ISSET(peerfd[i], &rset))
{
result = read(peerfd[i], buf, MAX_BUF);
if (result == 0)
{
FD_CLR(peerfd[i], &rset);
close(peerfd[i]);
peerfd[i] = 0;
sprintf(buf2, "[SERVER]: [%s][%s] LEFT. BYE-BYE. [%s]\n", peerip[i], peername[i], get_time());
forward_msg(peerfd, MAX_CLIENT, buf2, MAX_BUF);
bzero(buf2, MAX_BUF);
bzero(buf, MAX_BUF);
conn_clients--;
}
else if (result == -1)
{
perror("read");
exit(1);
}
else
{
sprintf(buf2, "[%s-%s]: %s (%s)\n", peerip[i], peername[i], buf, get_time());
forward_msg(peerfd, MAX_CLIENT, buf2, MAX_BUF);
bzero(buf2, MAX_BUF);
bzero(buf, MAX_BUF);
}
}
}
//sevrfd
if( FD_ISSET(sevrfd, &rset) )
{
if ( (newfd=accept(sevrfd, (struct sockaddr *) &peer_addr, &peer_addr_len)) == -1 )
{
perror("accept.");
continue;
}
read(newfd, buf, MAX_BUF);
bzero(ipstr, 30);
inet_ntop(AF_INET, (void *) &peer_addr.sin_addr, ipstr, 30);
if (conn_clients >= MAX_CLIENT)
{
write(newfd, "Too many clients. Please wait then try again...", 60);
printf("[SERVER]: NEW CLIENT [%s] FROM [%s] COME, BUT WE ARE ALREADY FULL.\n", buf, ipstr);
close(newfd);
continue;
}
write(newfd, "[SERVER]: WELCOME TO OUR CHATROOM!\n", 50);
for(i=0; i<MAX_CLIENT; i++)
{
if(peerfd[i] == 0)
{
peerfd[i] = newfd;
peername[i] = (char *)malloc(MAX_BUF);
strcpy(peername[i], buf);
peerip[i] = (char *)malloc(16);
strcpy(peerip[i], ipstr);
bzero(buf, MAX_BUF);
sprintf(buf2, "[SERVER]: [%s][%s] JOINED. WELCOME!\n", peerip[i], peername[i]);
forward_msg(peerfd, MAX_CLIENT, buf2, MAX_BUF);
bzero(buf2, MAX_BUF);
conn_clients++;
break;
}
}
}
//STDIN
if (FD_ISSET(0, &rset))
{
read(0, buf, MAX_BUF);
buf[strlen(buf) - 1] = '\0';
sprintf(buf2, "[SERVER]: %s (%s)\n", buf, get_time());
forward_msg(peerfd, MAX_CLIENT, buf2, MAX_BUF);
bzero(buf, MAX_BUF);
bzero(buf2, MAX_BUF);
}
}
return 0;
}
