[openssh-commits] [openssh] 05/06: upstream: SIGINFO handler for ssh(1) to dump active

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djm pushed a commit to branch master
in repository openssh.

commit f807a598c96be683d97810481e954ec9db6b0027
Author: djm at openbsd.org <djm at openbsd.org>
AuthorDate: Mon Aug 18 03:28:36 2025 +0000

    upstream: SIGINFO handler for ssh(1) to dump active
    
    channels/sessions ok deraadt@
    
    OpenBSD-Commit-ID: 12f88a5044bca40ef5f41ff61b1755d0e25df901
---
 clientloop.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/clientloop.c b/clientloop.c
index 5f6577f65..b9c050409 100644
--- a/clientloop.c
+++ b/clientloop.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: clientloop.c,v 1.412 2025/06/17 01:20:17 djm Exp $ */
+/* $OpenBSD: clientloop.c,v 1.413 2025/08/18 03:28:36 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo at cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo at cs.hut.fi>, Espoo, Finland
@@ -147,7 +147,8 @@ extern char *forward_agent_sock_path;
  * because this is updated in a signal handler.
  */
 static volatile sig_atomic_t received_window_change_signal = 0;
-static volatile sig_atomic_t received_signal = 0;
+static volatile sig_atomic_t siginfo_received = 0;
+static volatile sig_atomic_t received_signal = 0; /* exit signals */
 
 /* Time when backgrounded control master using ControlPersist should exit */
 static time_t control_persist_exit_time = 0;
@@ -224,6 +225,13 @@ window_change_handler(int sig)
 	received_window_change_signal = 1;
 }
 
+/* Signal handler for SIGINFO */
+static void
+siginfo_handler(int sig)
+{
+	siginfo_received = 1;
+}
+
 /*
  * Signal handler for signals that cause the program to terminate.  These
  * signals must be trapped to restore terminal modes.
@@ -1514,6 +1522,7 @@ client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
 	if (ssh_signal(SIGTERM, SIG_IGN) != SIG_IGN)
 		ssh_signal(SIGTERM, signal_handler);
 	ssh_signal(SIGWINCH, window_change_handler);
+	ssh_signal(SIGINFO, siginfo_handler);
 
 	if (have_pty)
 		enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
@@ -1536,7 +1545,8 @@ client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
 	    sigaddset(&bsigset, SIGHUP) == -1 ||
 	    sigaddset(&bsigset, SIGINT) == -1 ||
 	    sigaddset(&bsigset, SIGQUIT) == -1 ||
-	    sigaddset(&bsigset, SIGTERM) == -1)
+	    sigaddset(&bsigset, SIGTERM) == -1 ||
+	    sigaddset(&bsigset, SIGINFO) == -1)
 		error_f("bsigset setup: %s", strerror(errno));
 
 	/* Main loop of the client for the interactive session mode. */
@@ -1577,6 +1587,10 @@ client_loop(struct ssh *ssh, int have_pty, int escape_char_arg,
 		 */
 		if (sigprocmask(SIG_BLOCK, &bsigset, &osigset) == -1)
 			error_f("bsigset sigprocmask: %s", strerror(errno));
+		if (siginfo_received) {
+			siginfo_received = 0;
+			channel_report_open(ssh, SYSLOG_LEVEL_INFO);
+		}
 		if (quit_pending)
 			break;
 		client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc,

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