/* return port and ip address */
static int bind_to_port(int *port, int *ipaddress)
{
int fserver,ipaddr,server_port;
/* get a socket */
fserver = get_sock_net();
/* set buffer sizes for socket */
set_sock_opt(fserver);
/* bind to a free port, get port number */
server_port = bind_sock_to_port(fserver);
*port = server_port;
/* get ip address and return the socket file descriptor */
ipaddr=get_own_ip_address(); /* get own IPV4 address as 32 bit integer */
*ipaddress=ipaddr;
return(fserver);
}
void gossip_thread_server(char *LOGFILE, void (*event_loop)(EXTENDED_CLIENT_SLOT *), int TIMEOUT, void *data)
{
/* the first child is the actual server */
int fclient;
char *buf;
int buflen;
char *Auth_token = get_broker_Authorization();
/* int chgbuflen = FALSE; */
unsigned int Bauth_token = 0;
int fserver;
int server_port;
int ipaddr;
int b0, b1, b2, b3;
int myuid = getuid();
int client_uid, client_pid, client_auth;
int PING_INTERVAL;
unsigned char buffer[16];
fd_set rfds;
struct timeval tv = {0};
/* the second child will act as a watchdog and PINGs its parent periodically */
/* it will exit when parent has exited and therefore no longer accepts connections */
/* miscellaneous initializations + get Authorization token */
set_timeout_counter( TIMEOUT/get_ping_interval() ); /* set ping number */
PING_INTERVAL = get_ping_interval(); /* get ping interval */
if(Auth_token == NULL)
{
fprintf(stderr, "Authorization token failure \n");
exit(1);
}
sscanf( Auth_token, "%u", &Bauth_token );
/* get a socket */
fserver = get_sock_net();
/* set buffer sizes for socket */
set_sock_opt( fserver );
/* bind to a free port, get port number */
server_port = bind_sock_to_port( fserver );
/* parent writes host:port and exits after disconnecting stdin, stdout, and stderr */
ipaddr = get_own_ip_address(); /* get own IP address as 32 bit integer */
b0 = ipaddr >> 24; /* split IP address */
b1 = ipaddr >> 16;
b2 = ipaddr >> 8;
b3 = ipaddr;
b0 &= 255;
b1 &= 255;
b2 &= 255;
b3 &= 255;
buf = (char *)malloc(1024);
/* host_name = (char *)malloc(128); */
if ( !buf )
{
fprintf(stderr, "channel buffer is NULL !!!, exiting\n");
exit(1);
}
snprintf(buf, 1023, "%d.%d.%d.%d:%d", b0, b1, b2, b3, server_port);
/* fprintf(stderr, "Launching Server at host : \"%s\" \n", buf); */
set_host_and_port(LOGFILE, buf); /* write to channel info file */
/* write as A.B.C.D:port */
fprintf(stderr, "Launching Server at host: \"%s\" using port: \"%d\"\n", get_server_name(buf), server_port );
sprintf(buf, "%s.LOG", LOGFILE);
fclose(stdout); /* close and reopen STDOUT */
fclose(stderr); /* close and reopen STDERR */
freopen(buf, "w", stdout);
freopen(buf, "w", stderr);
if( fork() > 0 )
{
fprintf(stderr, "Exiting from parent process !!!\n");
exit(0); /* parent exits now */
}
setpgrp(); /* get into another process group */
/* set NO BUFFERING for STDOUT and STDERR */
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
client_auth = 0;
client_pid = 0;
client_uid = 0;
listen(fserver, 32767);
/* #ifdef NEVERTRUE */
/* pinging part */
if( (ping_pid = fork()) == 0 )
{
int watchdog_client;
int ping_ord = 0;
char *pingbuf;
pingbuf = (char *)malloc(128);
close(fserver);
sleep(PING_INTERVAL);
while(watchdog_client = connect_to_localport(server_port))
{
/* send PING command with ping counter */
sprintf(pingbuf, "PING %d", ping_ord++);
if(watchdog_client > 0)
{
write(watchdog_client, pingbuf, strlen(pingbuf));
close(watchdog_client);
}
else
{
fprintf(stderr, "End of Pinging Time, Server not responding !!!\n");
exit(0);
}
sleep(PING_INTERVAL);
}
if(pingbuf != NULL)
free(pingbuf);
exit(0);
}
else if (ping_pid < 0)
{
fprintf(stderr, "Error: cannot fork server process, pid = %d\n", ping_pid);
}
/* #endif */
/* fd_set rfds; */
/* struct timeval tv; */
tv.tv_sec = 5;
tv.tv_usec = 0;
/* back to first child, loop on connection requests */
while( fclient = accept_from_sock(fserver) )
{
/* timeout */
FD_ZERO(&rfds);
FD_SET(fclient, &rfds);
if (select(fclient+1, &rfds, NULL, NULL, &tv))
{
buflen = read(fclient, buf, NCARMAX); /* get LOGIN command */
}
else
{
exit(1);
}
buf[buflen > 0 ? buflen : 0] = '\0';
if(get_active_channels() <= 0 && exit_flag)
{
fprintf(stderr, "Exiting from server, active channels: %d\n", get_active_channels());
store_all_channels_data();
close(fclient);
fprintf(stderr, "Server EXITING !\n");
if(ping_pid > 0)
{
kill(ping_pid, 9);
}
exit(1);
}
if(strncmp(buf, "PING", 4) == 0) /* PING ? */
{
/* echo to logfile */
fprintf(stderr, "Server: PING %d (%d)\n", TIMEOUT/get_ping_interval() - get_timeout_counter(), get_timeout_counter());
close(fclient);
if(get_timeout_counter() <= 0 || ( ( get_active_channels() <= 0) && exit_flag ) )
{
/* Before exiting save any pending data buffer(s)
to corresponding subchannel file(s) */
store_all_channels_data();
/**********NEW*********/
/* if(get_last_channel()) */
/**********NEW*********/
fprintf(stderr, "TIMEOUT detected, EXITING \n");
if(ping_pid > 0)
{
kill(ping_pid, 9);
}
exit(1);
}
decrement_timeout_counter();
continue; /* go service next connection request */
}
/* validate login command, check client uid against server uid,
verify that authorization token is the right one,
register client pid as connected if connection accepted */
if(strncmp(buf, "LOGIN", 5) == 0)
{
client_uid = -1 ;
client_pid = -1 ;
/* sscanf(buf, "LOGIN %d %d %u", &client_uid, &client_pid, &client_auth); */
sscanf(buf, "LOGIN %d %d %u", &client_uid, &client_pid, &client_auth);
/* reject connection if not my uid
or bad authorization token or not
a LOGIN command */
if( client_uid != myuid || md5_ssh( buffer ) )
{
printf("Client Authentication FAILED\n");
continue;
}
else /* LOGIN accepted, process next command */
{
send_ack_nack(fclient, IS_OK); /* Positive ACK, LOGIN accepted */
/* printf("SSH Digest: %x\n", buffer); */
/* start a new thread to handle user request */
start_client_thread_2((void *)&user_server, client_uid, client_pid, fclient, buf, data , (void *)event_loop);
continue;
}
}
else
{
fprintf(stderr, "LOGIN command expected: %s\n", buf);
send_ack_nack(fclient, NOT_OK); /* Negative ACK, LOGIN rejected */
}
} /* end while accept is successful */
printf("Accept from socket failed, exiting !!!, fserver = %d\n", fserver);
if(ping_pid > 0)
{
kill(ping_pid, 9);
}
if(buf)
free(buf);
exit(1);
}