upstream commit
remove ssh1 server code; ok djm@
Upstream-ID: c24c0c32c49b91740d5a94ae914fb1898ea5f534
diff --git a/serverloop.c b/serverloop.c
index 3563e5d..1e21170 100644
--- a/serverloop.c
+++ b/serverloop.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: serverloop.c,v 1.184 2016/03/07 19:02:43 djm Exp $ */
+/* $OpenBSD: serverloop.c,v 1.185 2016/08/13 17:47:41 markus Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -67,7 +67,6 @@
#include "sshpty.h"
#include "channels.h"
#include "compat.h"
-#include "ssh1.h"
#include "ssh2.h"
#include "key.h"
#include "cipher.h"
@@ -86,25 +85,6 @@
extern Authctxt *the_authctxt;
extern int use_privsep;
-static Buffer stdin_buffer; /* Buffer for stdin data. */
-static Buffer stdout_buffer; /* Buffer for stdout data. */
-static Buffer stderr_buffer; /* Buffer for stderr data. */
-static int fdin; /* Descriptor for stdin (for writing) */
-static int fdout; /* Descriptor for stdout (for reading);
- May be same number as fdin. */
-static int fderr; /* Descriptor for stderr. May be -1. */
-static long stdin_bytes = 0; /* Number of bytes written to stdin. */
-static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */
-static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */
-static long fdout_bytes = 0; /* Number of stdout bytes read from program. */
-static int stdin_eof = 0; /* EOF message received from client. */
-static int fdout_eof = 0; /* EOF encountered reading from fdout. */
-static int fderr_eof = 0; /* EOF encountered readung from fderr. */
-static int fdin_is_tty = 0; /* fdin points to a tty. */
-static int connection_in; /* Connection to client (input). */
-static int connection_out; /* Connection to client (output). */
-static int connection_closed = 0; /* Connection to client closed. */
-static u_int buffer_high; /* "Soft" max buffer size. */
static int no_more_sessions = 0; /* Disallow further sessions. */
/*
@@ -185,64 +165,6 @@
received_sigterm = sig;
}
-/*
- * Make packets from buffered stderr data, and buffer it for sending
- * to the client.
- */
-static void
-make_packets_from_stderr_data(void)
-{
- u_int len;
-
- /* Send buffered stderr data to the client. */
- while (buffer_len(&stderr_buffer) > 0 &&
- packet_not_very_much_data_to_write()) {
- len = buffer_len(&stderr_buffer);
- if (packet_is_interactive()) {
- if (len > 512)
- len = 512;
- } else {
- /* Keep the packets at reasonable size. */
- if (len > packet_get_maxsize())
- len = packet_get_maxsize();
- }
- packet_start(SSH_SMSG_STDERR_DATA);
- packet_put_string(buffer_ptr(&stderr_buffer), len);
- packet_send();
- buffer_consume(&stderr_buffer, len);
- stderr_bytes += len;
- }
-}
-
-/*
- * Make packets from buffered stdout data, and buffer it for sending to the
- * client.
- */
-static void
-make_packets_from_stdout_data(void)
-{
- u_int len;
-
- /* Send buffered stdout data to the client. */
- while (buffer_len(&stdout_buffer) > 0 &&
- packet_not_very_much_data_to_write()) {
- len = buffer_len(&stdout_buffer);
- if (packet_is_interactive()) {
- if (len > 512)
- len = 512;
- } else {
- /* Keep the packets at reasonable size. */
- if (len > packet_get_maxsize())
- len = packet_get_maxsize();
- }
- packet_start(SSH_SMSG_STDOUT_DATA);
- packet_put_string(buffer_ptr(&stdout_buffer), len);
- packet_send();
- buffer_consume(&stdout_buffer, len);
- stdout_bytes += len;
- }
-}
-
static void
client_alive_check(void)
{
@@ -275,14 +197,14 @@
* for the duration of the wait (0 = infinite).
*/
static void
-wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
+wait_until_can_do_something(int connection_in, int connection_out,
+ fd_set **readsetp, fd_set **writesetp, int *maxfdp,
u_int *nallocp, u_int64_t max_time_ms)
{
struct timeval tv, *tvp;
int ret;
time_t minwait_secs = 0;
int client_alive_scheduled = 0;
- int program_alive_scheduled = 0;
/* Allocate and update select() masks for channel descriptors. */
channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
@@ -300,7 +222,7 @@
* this could be randomized somewhat to make traffic
* analysis more difficult, but we're not doing it yet.
*/
- if (compat20 && options.client_alive_interval) {
+ if (options.client_alive_interval) {
uint64_t keepalive_ms =
(uint64_t)options.client_alive_interval * 1000;
@@ -309,38 +231,11 @@
max_time_ms = keepalive_ms;
}
- if (compat20) {
#if 0
- /* wrong: bad condition XXX */
- if (channel_not_very_much_buffered_data())
+ /* wrong: bad condition XXX */
+ if (channel_not_very_much_buffered_data())
#endif
- FD_SET(connection_in, *readsetp);
- } else {
- /*
- * Read packets from the client unless we have too much
- * buffered stdin or channel data.
- */
- if (buffer_len(&stdin_buffer) < buffer_high &&
- channel_not_very_much_buffered_data())
- FD_SET(connection_in, *readsetp);
- /*
- * If there is not too much data already buffered going to
- * the client, try to get some more data from the program.
- */
- if (packet_not_very_much_data_to_write()) {
- program_alive_scheduled = child_terminated;
- if (!fdout_eof)
- FD_SET(fdout, *readsetp);
- if (!fderr_eof)
- FD_SET(fderr, *readsetp);
- }
- /*
- * If we have buffered data, try to write some of that data
- * to the program.
- */
- if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
- FD_SET(fdin, *writesetp);
- }
+ FD_SET(connection_in, *readsetp);
notify_prepare(*readsetp);
/*
@@ -374,16 +269,8 @@
memset(*writesetp, 0, *nallocp);
if (errno != EINTR)
error("select: %.100s", strerror(errno));
- } else {
- if (ret == 0 && client_alive_scheduled)
- client_alive_check();
- if (!compat20 && program_alive_scheduled && fdin_is_tty) {
- if (!fdout_eof)
- FD_SET(fdout, *readsetp);
- if (!fderr_eof)
- FD_SET(fderr, *readsetp);
- }
- }
+ } else if (ret == 0 && client_alive_scheduled)
+ client_alive_check();
notify_done(*readsetp);
}
@@ -392,8 +279,8 @@
* Processes input from the client and the program. Input data is stored
* in buffers and processed later.
*/
-static void
-process_input(fd_set *readset)
+static int
+process_input(fd_set *readset, int connection_in)
{
struct ssh *ssh = active_state; /* XXX */
int len;
@@ -405,10 +292,7 @@
if (len == 0) {
verbose("Connection closed by %.100s port %d",
ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
- connection_closed = 1;
- if (compat20)
- return;
- cleanup_exit(255);
+ return -1;
} else if (len < 0) {
if (errno != EINTR && errno != EAGAIN &&
errno != EWOULDBLOCK) {
@@ -423,381 +307,26 @@
packet_process_incoming(buf, len);
}
}
- if (compat20)
- return;
-
- /* Read and buffer any available stdout data from the program. */
- if (!fdout_eof && FD_ISSET(fdout, readset)) {
- errno = 0;
- len = read(fdout, buf, sizeof(buf));
- if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
- errno == EWOULDBLOCK) && !child_terminated))) {
- /* do nothing */
-#ifndef PTY_ZEROREAD
- } else if (len <= 0) {
-#else
- } else if ((!isatty(fdout) && len <= 0) ||
- (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) {
-#endif
- fdout_eof = 1;
- } else {
- buffer_append(&stdout_buffer, buf, len);
- fdout_bytes += len;
- }
- }
- /* Read and buffer any available stderr data from the program. */
- if (!fderr_eof && FD_ISSET(fderr, readset)) {
- errno = 0;
- len = read(fderr, buf, sizeof(buf));
- if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
- errno == EWOULDBLOCK) && !child_terminated))) {
- /* do nothing */
-#ifndef PTY_ZEROREAD
- } else if (len <= 0) {
-#else
- } else if ((!isatty(fderr) && len <= 0) ||
- (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) {
-#endif
- fderr_eof = 1;
- } else {
- buffer_append(&stderr_buffer, buf, len);
- }
- }
+ return 0;
}
/*
* Sends data from internal buffers to client program stdin.
*/
static void
-process_output(fd_set *writeset)
+process_output(fd_set *writeset, int connection_out)
{
- struct termios tio;
- u_char *data;
- u_int dlen;
- int len;
-
- /* Write buffered data to program stdin. */
- if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
- data = buffer_ptr(&stdin_buffer);
- dlen = buffer_len(&stdin_buffer);
- len = write(fdin, data, dlen);
- if (len < 0 &&
- (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) {
- /* do nothing */
- } else if (len <= 0) {
- if (fdin != fdout)
- close(fdin);
- else
- shutdown(fdin, SHUT_WR); /* We will no longer send. */
- fdin = -1;
- } else {
- /* Successful write. */
- if (fdin_is_tty && dlen >= 1 && data[0] != '\r' &&
- tcgetattr(fdin, &tio) == 0 &&
- !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
- /*
- * Simulate echo to reduce the impact of
- * traffic analysis
- */
- packet_send_ignore(len);
- packet_send();
- }
- /* Consume the data from the buffer. */
- buffer_consume(&stdin_buffer, len);
- /* Update the count of bytes written to the program. */
- stdin_bytes += len;
- }
- }
/* Send any buffered packet data to the client. */
if (FD_ISSET(connection_out, writeset))
packet_write_poll();
}
-/*
- * Wait until all buffered output has been sent to the client.
- * This is used when the program terminates.
- */
-static void
-drain_output(void)
-{
- /* Send any buffered stdout data to the client. */
- if (buffer_len(&stdout_buffer) > 0) {
- packet_start(SSH_SMSG_STDOUT_DATA);
- packet_put_string(buffer_ptr(&stdout_buffer),
- buffer_len(&stdout_buffer));
- packet_send();
- /* Update the count of sent bytes. */
- stdout_bytes += buffer_len(&stdout_buffer);
- }
- /* Send any buffered stderr data to the client. */
- if (buffer_len(&stderr_buffer) > 0) {
- packet_start(SSH_SMSG_STDERR_DATA);
- packet_put_string(buffer_ptr(&stderr_buffer),
- buffer_len(&stderr_buffer));
- packet_send();
- /* Update the count of sent bytes. */
- stderr_bytes += buffer_len(&stderr_buffer);
- }
- /* Wait until all buffered data has been written to the client. */
- packet_write_wait();
-}
-
static void
process_buffered_input_packets(void)
{
dispatch_run(DISPATCH_NONBLOCK, NULL, active_state);
}
-/*
- * Performs the interactive session. This handles data transmission between
- * the client and the program. Note that the notion of stdin, stdout, and
- * stderr in this function is sort of reversed: this function writes to
- * stdin (of the child program), and reads from stdout and stderr (of the
- * child program).
- */
-void
-server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
-{
- fd_set *readset = NULL, *writeset = NULL;
- int max_fd = 0;
- u_int nalloc = 0;
- int wait_status; /* Status returned by wait(). */
- pid_t wait_pid; /* pid returned by wait(). */
- int waiting_termination = 0; /* Have displayed waiting close message. */
- u_int64_t max_time_milliseconds;
- u_int previous_stdout_buffer_bytes;
- u_int stdout_buffer_bytes;
- int type;
-
- debug("Entering interactive session.");
-
- /* Initialize the SIGCHLD kludge. */
- child_terminated = 0;
- mysignal(SIGCHLD, sigchld_handler);
-
- if (!use_privsep) {
- signal(SIGTERM, sigterm_handler);
- signal(SIGINT, sigterm_handler);
- signal(SIGQUIT, sigterm_handler);
- }
-
- /* Initialize our global variables. */
- fdin = fdin_arg;
- fdout = fdout_arg;
- fderr = fderr_arg;
-
- /* nonblocking IO */
- set_nonblock(fdin);
- set_nonblock(fdout);
- /* we don't have stderr for interactive terminal sessions, see below */
- if (fderr != -1)
- set_nonblock(fderr);
-
- if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin))
- fdin_is_tty = 1;
-
- connection_in = packet_get_connection_in();
- connection_out = packet_get_connection_out();
-
- notify_setup();
-
- previous_stdout_buffer_bytes = 0;
-
- /* Set approximate I/O buffer size. */
- if (packet_is_interactive())
- buffer_high = 4096;
- else
- buffer_high = 64 * 1024;
-
-#if 0
- /* Initialize max_fd to the maximum of the known file descriptors. */
- max_fd = MAX(connection_in, connection_out);
- max_fd = MAX(max_fd, fdin);
- max_fd = MAX(max_fd, fdout);
- if (fderr != -1)
- max_fd = MAX(max_fd, fderr);
-#endif
-
- /* Initialize Initialize buffers. */
- buffer_init(&stdin_buffer);
- buffer_init(&stdout_buffer);
- buffer_init(&stderr_buffer);
-
- /*
- * If we have no separate fderr (which is the case when we have a pty
- * - there we cannot make difference between data sent to stdout and
- * stderr), indicate that we have seen an EOF from stderr. This way
- * we don't need to check the descriptor everywhere.
- */
- if (fderr == -1)
- fderr_eof = 1;
-
- server_init_dispatch();
-
- /* Main loop of the server for the interactive session mode. */
- for (;;) {
-
- /* Process buffered packets from the client. */
- process_buffered_input_packets();
-
- /*
- * If we have received eof, and there is no more pending
- * input data, cause a real eof by closing fdin.
- */
- if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
- if (fdin != fdout)
- close(fdin);
- else
- shutdown(fdin, SHUT_WR); /* We will no longer send. */
- fdin = -1;
- }
- /* Make packets from buffered stderr data to send to the client. */
- make_packets_from_stderr_data();
-
- /*
- * Make packets from buffered stdout data to send to the
- * client. If there is very little to send, this arranges to
- * not send them now, but to wait a short while to see if we
- * are getting more data. This is necessary, as some systems
- * wake up readers from a pty after each separate character.
- */
- max_time_milliseconds = 0;
- stdout_buffer_bytes = buffer_len(&stdout_buffer);
- if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
- stdout_buffer_bytes != previous_stdout_buffer_bytes) {
- /* try again after a while */
- max_time_milliseconds = 10;
- } else {
- /* Send it now. */
- make_packets_from_stdout_data();
- }
- previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
-
- /* Send channel data to the client. */
- if (packet_not_very_much_data_to_write())
- channel_output_poll();
-
- /*
- * Bail out of the loop if the program has closed its output
- * descriptors, and we have no more data to send to the
- * client, and there is no pending buffered data.
- */
- if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
- buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
- if (!channel_still_open())
- break;
- if (!waiting_termination) {
- const char *s = "Waiting for forwarded connections to terminate...\r\n";
- char *cp;
- waiting_termination = 1;
- buffer_append(&stderr_buffer, s, strlen(s));
-
- /* Display list of open channels. */
- cp = channel_open_message();
- buffer_append(&stderr_buffer, cp, strlen(cp));
- free(cp);
- }
- }
- max_fd = MAX(connection_in, connection_out);
- max_fd = MAX(max_fd, fdin);
- max_fd = MAX(max_fd, fdout);
- max_fd = MAX(max_fd, fderr);
- max_fd = MAX(max_fd, notify_pipe[0]);
-
- /* Sleep in select() until we can do something. */
- wait_until_can_do_something(&readset, &writeset, &max_fd,
- &nalloc, max_time_milliseconds);
-
- if (received_sigterm) {
- logit("Exiting on signal %d", (int)received_sigterm);
- /* Clean up sessions, utmp, etc. */
- cleanup_exit(255);
- }
-
- /* Process any channel events. */
- channel_after_select(readset, writeset);
-
- /* Process input from the client and from program stdout/stderr. */
- process_input(readset);
-
- /* Process output to the client and to program stdin. */
- process_output(writeset);
- }
- free(readset);
- free(writeset);
-
- /* Cleanup and termination code. */
-
- /* Wait until all output has been sent to the client. */
- drain_output();
-
- debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
- stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
-
- /* Free and clear the buffers. */
- buffer_free(&stdin_buffer);
- buffer_free(&stdout_buffer);
- buffer_free(&stderr_buffer);
-
- /* Close the file descriptors. */
- if (fdout != -1)
- close(fdout);
- fdout = -1;
- fdout_eof = 1;
- if (fderr != -1)
- close(fderr);
- fderr = -1;
- fderr_eof = 1;
- if (fdin != -1)
- close(fdin);
- fdin = -1;
-
- channel_free_all();
-
- /* We no longer want our SIGCHLD handler to be called. */
- mysignal(SIGCHLD, SIG_DFL);
-
- while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0)
- if (errno != EINTR)
- packet_disconnect("wait: %.100s", strerror(errno));
- if (wait_pid != pid)
- error("Strange, wait returned pid %ld, expected %ld",
- (long)wait_pid, (long)pid);
-
- /* Check if it exited normally. */
- if (WIFEXITED(wait_status)) {
- /* Yes, normal exit. Get exit status and send it to the client. */
- debug("Command exited with status %d.", WEXITSTATUS(wait_status));
- packet_start(SSH_SMSG_EXITSTATUS);
- packet_put_int(WEXITSTATUS(wait_status));
- packet_send();
- packet_write_wait();
-
- /*
- * Wait for exit confirmation. Note that there might be
- * other packets coming before it; however, the program has
- * already died so we just ignore them. The client is
- * supposed to respond with the confirmation when it receives
- * the exit status.
- */
- do {
- type = packet_read();
- }
- while (type != SSH_CMSG_EXIT_CONFIRMATION);
-
- debug("Received exit confirmation.");
- return;
- }
- /* Check if the program terminated due to a signal. */
- if (WIFSIGNALED(wait_status))
- packet_disconnect("Command terminated on signal %d.",
- WTERMSIG(wait_status));
-
- /* Some weird exit cause. Just exit. */
- packet_disconnect("wait returned status %04x.", wait_status);
- /* NOTREACHED */
-}
-
static void
collect_children(void)
{
@@ -825,7 +354,7 @@
{
fd_set *readset = NULL, *writeset = NULL;
int max_fd;
- u_int nalloc = 0;
+ u_int nalloc = 0, connection_in, connection_out;
u_int64_t rekey_timeout_ms = 0;
debug("Entering interactive session for SSH2.");
@@ -854,14 +383,14 @@
if (!ssh_packet_is_rekeying(active_state) &&
packet_not_very_much_data_to_write())
channel_output_poll();
- if (options.rekey_interval > 0 && compat20 &&
+ if (options.rekey_interval > 0 &&
!ssh_packet_is_rekeying(active_state))
rekey_timeout_ms = packet_get_rekey_timeout() * 1000;
else
rekey_timeout_ms = 0;
- wait_until_can_do_something(&readset, &writeset, &max_fd,
- &nalloc, rekey_timeout_ms);
+ wait_until_can_do_something(connection_in, connection_out,
+ &readset, &writeset, &max_fd, &nalloc, rekey_timeout_ms);
if (received_sigterm) {
logit("Exiting on signal %d", (int)received_sigterm);
@@ -872,10 +401,9 @@
collect_children();
if (!ssh_packet_is_rekeying(active_state))
channel_after_select(readset, writeset);
- process_input(readset);
- if (connection_closed)
+ if (process_input(readset, connection_in) < 0)
break;
- process_output(writeset);
+ process_output(writeset, connection_out);
}
collect_children();
@@ -902,53 +430,6 @@
return 0;
}
-static int
-server_input_stdin_data(int type, u_int32_t seq, void *ctxt)
-{
- char *data;
- u_int data_len;
-
- /* Stdin data from the client. Append it to the buffer. */
- /* Ignore any data if the client has closed stdin. */
- if (fdin == -1)
- return 0;
- data = packet_get_string(&data_len);
- packet_check_eom();
- buffer_append(&stdin_buffer, data, data_len);
- explicit_bzero(data, data_len);
- free(data);
- return 0;
-}
-
-static int
-server_input_eof(int type, u_int32_t seq, void *ctxt)
-{
- /*
- * Eof from the client. The stdin descriptor to the
- * program will be closed when all buffered data has
- * drained.
- */
- debug("EOF received for stdin.");
- packet_check_eom();
- stdin_eof = 1;
- return 0;
-}
-
-static int
-server_input_window_size(int type, u_int32_t seq, void *ctxt)
-{
- u_int row = packet_get_int();
- u_int col = packet_get_int();
- u_int xpixel = packet_get_int();
- u_int ypixel = packet_get_int();
-
- debug("Window change received.");
- packet_check_eom();
- if (fdin != -1)
- pty_change_window_size(fdin, row, col, xpixel, ypixel);
- return 0;
-}
-
static Channel *
server_request_direct_tcpip(void)
{
@@ -1353,9 +834,9 @@
}
static void
-server_init_dispatch_20(void)
+server_init_dispatch(void)
{
- debug("server_init_dispatch_20");
+ debug("server_init_dispatch");
dispatch_init(&dispatch_protocol_error);
dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
@@ -1375,36 +856,3 @@
/* rekeying */
dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
}
-static void
-server_init_dispatch_13(void)
-{
- debug("server_init_dispatch_13");
- dispatch_init(NULL);
- dispatch_set(SSH_CMSG_EOF, &server_input_eof);
- dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
- dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
- dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
- dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
- dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
- dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
- dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
- dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
-}
-static void
-server_init_dispatch_15(void)
-{
- server_init_dispatch_13();
- debug("server_init_dispatch_15");
- dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
- dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
-}
-static void
-server_init_dispatch(void)
-{
- if (compat20)
- server_init_dispatch_20();
- else if (compat13)
- server_init_dispatch_13();
- else
- server_init_dispatch_15();
-}