int main(int argc, char ** argv) {
uint16_t l_port;
int l_socket;
int exit_status;
if ( (l_port = get_port_from_commandline(argc, argv)) == 0 ) {
return EXIT_FAILURE;
}
if ( (l_socket = create_tcp_server_socket(l_port)) == -1 ) {
return EXIT_FAILURE;
}
exit_status = start_threaded_tcp_server(l_socket, echo_server);
return exit_status;
}
// perform FTP PASV command, prepare for passive data connection
void command_pasv(CLIENT_INFO * client_info)
{
char line[BUFFER_SIZE] = { 0 };
client_read_line(client_info->fd, client_info->buf, &client_info->buffer_pos);
extract_line(line, client_info->buf, &client_info->buffer_pos);
int len = strlen(line);
if (len != 4)
{
send_code(client_info->fd, 500);
return;
}
if (client_info->passive_fd != 0)
{
close(client_info->passive_fd);
client_info->passive_fd = 0;
}
struct sockaddr_in s;
socklen_t l;
l = sizeof(s);
getsockname(client_info->fd, (struct sockaddr *)&s, &l);
char * ip = inet_ntoa(s.sin_addr);
if (! ip) epicfail("inet_ntoa");
client_info->data_connection_mode = CONN_MODE_PASSIVE;
client_info->passive_fd = create_tcp_server_socket(ip, 0);
l = sizeof(s);
getsockname(client_info->passive_fd, (struct sockaddr *)&s, &l);
int port = ntohs(s.sin_port);
int ip1, ip2, ip3, ip4, port1, port2;
if (sscanf(ip, "%d.%d.%d.%d", &ip1, &ip2, &ip3, &ip4) != 4) epicfail("command_pasv");
port1 = port >> 8;
port2 = port & 0xff;
char p[64];
sprintf(p, "%d,%d,%d,%d,%d,%d", ip1, ip2, ip3, ip4, port1, port2);
send_code_param(client_info->fd, 227, p);
}
// main entry point
int main(int argc, char * argv[])
{
char * source_addr = "0.0.0.0";
int source_port = 21;
strcpy(basedir, "/");
int c;
while ((c = getopt (argc, argv, ":s:p:d:h")) != -1)
{
if (c == 's')
{
source_addr = optarg;
}
else if (c == 'p')
{
source_port = atoi(optarg);
}
else if (c == 'd')
{
strcpy(basedir, optarg);
}
else if (c == ':')
{
printf("-%c requires an argument\n", optopt);
return 1;
}
else if (c == 'h')
{
return help();
}
else if (c == '?')
{
printf("Unrecognized parameter. Use '-h' for help.\n");
return 1;
}
}
struct stat s;
if (stat(basedir, &s) == -1)
{
printf("The specified base directory does not exist.\n");
return 1;
}
char tmpbasedir[PATH_MAX + 1] = { 0 };
if (! realpath(basedir, tmpbasedir)) epicfail("realpath");
strcpy(basedir, tmpbasedir);
printf("adoftp server is starting...\n");
printf("base directory is %s\n", basedir);
if (strcmp(basedir, "/") == 0) strcpy(basedir, "");
printf("listening on %s:%d\n", source_addr, source_port);
int server = create_tcp_server_socket(source_addr, source_port);
while (1)
{
int client = accept_connection(server);
pthread_t thread_id;
int result = pthread_create(&thread_id, NULL, thread_proc, (void *)client);
if (result) epicfail("pthread_create");
}
}