int nsock_full_write(fd_t fd_,void *data, int size)
{
int nbytes = nsock_write(fd_,data,size);
int tmp_size = size;
while(nbytes>=0&&nbytes<tmp_size)
{
data = (char*)data+nbytes;
tmp_size -= nbytes;
nbytes = nsock_write(fd_,data,tmp_size);
}
if(size==nbytes)
return tmp_size;
return -1;
}
ssize_t
nsock_fdprintf(nsock_t *ns, const u_char *fmt, ...)
{
va_list vl;
u_char tbuf[8192];
va_start(vl, fmt);
memset(tbuf, 0, sizeof(tbuf));
vsnprintf((char *)tbuf, sizeof(tbuf) - 1, (char *)fmt, vl);
va_end(vl);
return nsock_write(ns, tbuf, strlen((char *)tbuf));
}
static void read_stdin_handler(nsock_pool nsp, nsock_event evt, void *data)
{
enum nse_status status = nse_status(evt);
enum nse_type type = nse_type(evt);
char *buf, *tmp = NULL;
int nbytes;
assert(type == NSE_TYPE_READ);
if (status == NSE_STATUS_EOF) {
if (o.sendonly) {
/* In --send-only mode, exit after EOF on stdin. */
nsock_loop_quit(nsp);
} else {
shutdown(nsi_getsd(cs.sock_nsi), SHUT_WR);
}
return;
} else if (status == NSE_STATUS_ERROR) {
loguser("%s.\n", socket_strerror(nse_errorcode(evt)));
exit(1);
} else if (status == NSE_STATUS_TIMEOUT) {
loguser("%s.\n", socket_strerror(ETIMEDOUT));
exit(1);
} else if (status == NSE_STATUS_CANCELLED || status == NSE_STATUS_KILL) {
return;
} else {
assert(status == NSE_STATUS_SUCCESS);
}
buf = nse_readbuf(evt, &nbytes);
/* read from stdin */
if (o.linedelay)
ncat_delay_timer(o.linedelay);
if (o.crlf) {
if (fix_line_endings(buf, &nbytes, &tmp, &cs.crlf_state))
buf = tmp;
}
nsock_write(nsp, cs.sock_nsi, write_socket_handler, -1, NULL, buf, nbytes);
ncat_log_send(buf, nbytes);
if (tmp)
free(tmp);
refresh_idle_timer(nsp);
}
void telnet_event_handler(nsock_pool nsp, nsock_event nse, void *mydata) {
nsock_iod nsi = nse_iod(nse);
enum nse_status status = nse_status(nse);
enum nse_type type = nse_type(nse);
struct sockaddr_in peer;
struct telnet_state *ts;
int nbytes;
char *str;
int read_timeout = -1;
int write_timeout = 2000;
ts = (struct telnet_state *)mydata;
printf("telnet_event_handler: Received callback of type %s with status %s\n", nse_type2str(type), nse_status2str(status));
if (status == NSE_STATUS_SUCCESS) {
switch (type) {
case NSE_TYPE_CONNECT:
case NSE_TYPE_CONNECT_SSL:
nsi_getlastcommunicationinfo(nsi, NULL, NULL, NULL, (struct sockaddr *)&peer, sizeof peer);
printf("Successfully connected %sto %s:%hu -- start typing lines\n", (type == NSE_TYPE_CONNECT_SSL) ? "(SSL!) " : "", inet_ntoa(peer.sin_addr), peer.sin_port);
/* First of all, lets add STDIN to our list of watched filehandles */
if ((ts->stdin_nsi = nsi_new2(nsp, STDIN_FILENO, NULL)) == NULL) {
fprintf(stderr, "Failed to create stdin msi\n");
exit(1);
}
/* Now lets read from stdin and the network, line buffered (by nsock) */
ts->latest_readtcpev = nsock_readlines(nsp, ts->tcp_nsi, telnet_event_handler, read_timeout, ts, 1);
ts->latest_readstdinev = nsock_readlines(nsp, ts->stdin_nsi, telnet_event_handler, read_timeout, ts, 1);
break;
case NSE_TYPE_READ:
str = nse_readbuf(nse, &nbytes);
if (nsi == ts->tcp_nsi) {
printf("%s", str);
/* printf("Read from tcp socket (%d bytes):\n%s", nbytes, str); */
ts->latest_readtcpev = nsock_readlines(nsp, ts->tcp_nsi, telnet_event_handler, read_timeout, ts, 1);
} else {
/* printf("Read from stdin (%d bytes):\n%s", nbytes, str); */
nsock_write(nsp, ts->tcp_nsi, telnet_event_handler, write_timeout, ts, str, nbytes);
ts->latest_readstdinev = nsock_readlines(nsp, ts->stdin_nsi, telnet_event_handler, read_timeout, ts, 1);
}
break;
case NSE_TYPE_WRITE:
/* Nothing to do, really */
break;
case NSE_TYPE_TIMER:
break;
default:
fprintf(stderr, "telnet_event_handler: Got bogus type -- quitting\n");
exit(1);
break;
}
} else if (status == NSE_STATUS_EOF) {
printf("Got EOF from %s\nCancelling outstanding readevents.\n", (nsi == ts->tcp_nsi) ? "tcp socket" : "stdin");
/* One of these is the event I am currently handling! But I wanted to
be evil when testing this out... */
if (nsock_event_cancel(nsp, ts->latest_readtcpev, 1) != 0) {
printf("Cancelled tcp event: %li\n", ts->latest_readtcpev);
}
if (nsock_event_cancel(nsp, ts->latest_readstdinev, 1) != 0) {
printf("Cancelled stdin event: %li\n", ts->latest_readstdinev);
}
} else if (status == NSE_STATUS_ERROR) {
if (nsi_checkssl(nsi)) {
printf("SSL %s failed: %s\n", nse_type2str(type), ERR_error_string(ERR_get_error(), NULL));
} else {
int err;
err = nse_errorcode(nse);
printf("%s failed: (%d) %s\n", nse_type2str(type), err, strerror(err));
}
}
return;
}
