*/
#include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.115 2003/09/23 20:41:11 markus Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.117 2003/12/16 15:49:51 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
/* Flag indicating that stdin should be redirected from /dev/null. */
extern int stdin_null_flag;
+/* Flag indicating that no shell has been requested */
+extern int no_shell_flag;
+
/*
* Name of the host we are connecting to. This is the name given on the
* command line, or the HostName specified for the user-supplied name in a
static int connection_out; /* Connection to server (output). */
static int need_rekeying; /* Set to non-zero if rekeying is requested. */
static int session_closed = 0; /* In SSH2: login session closed. */
+static int server_alive_timeouts = 0;
static void client_init_dispatch(void);
int session_ident = -1;
}
}
+static void
+client_global_request_reply(int type, u_int32_t seq, void *ctxt)
+{
+ server_alive_timeouts = 0;
+ client_global_request_reply_fwd(type, seq, ctxt);
+}
+
+static void
+server_alive_check(void)
+{
+ if (++server_alive_timeouts > options.server_alive_count_max)
+ packet_disconnect("Timeout, server not responding.");
+ packet_start(SSH2_MSG_GLOBAL_REQUEST);
+ packet_put_cstring("keepalive@openssh.com");
+ packet_put_char(1); /* boolean: want reply */
+ packet_send();
+}
+
/*
* Waits until the client can do something (some data becomes available on
* one of the file descriptors).
client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
int *maxfdp, int *nallocp, int rekeying)
{
+ struct timeval tv, *tvp;
+ int ret;
+
/* Add any selections by the channel mechanism. */
channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
/*
* Wait for something to happen. This will suspend the process until
* some selected descriptor can be read, written, or has some other
- * event pending. Note: if you want to implement SSH_MSG_IGNORE
- * messages to fool traffic analysis, this might be the place to do
- * it: just have a random timeout for the select, and send a random
- * SSH_MSG_IGNORE packet when the timeout expires.
+ * event pending.
*/
- if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
+ if (options.server_alive_interval == 0 || !compat20)
+ tvp = NULL;
+ else {
+ tv.tv_sec = options.server_alive_interval;
+ tv.tv_usec = 0;
+ tvp = &tv;
+ }
+ ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
+ if (ret < 0) {
char buf[100];
/*
snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
buffer_append(&stderr_buffer, buf, strlen(buf));
quit_pending = 1;
- }
+ } else if (ret == 0)
+ server_alive_check();
}
static void
if (!isatty(fileno(stderr)))
unset_nonblock(fileno(stderr));
+ /*
+ * If there was no shell or command requested, there will be no remote
+ * exit status to be returned. In that case, clear error code if the
+ * connection was deliberately terminated at this end.
+ */
+ if (no_shell_flag && received_signal == SIGTERM) {
+ received_signal = 0;
+ exit_status = 0;
+ }
+
if (received_signal)
fatal("Killed by signal %d.", (int) received_signal);
rtype = packet_get_string(NULL);
want_reply = packet_get_char();
- debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply);
+ debug("client_input_global_request: rtype %s want_reply %d",
+ rtype, want_reply);
if (want_reply) {
packet_start(success ?
SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);