From 508284cd28106b2d72caf9341bbb4131c6a56cd9 Mon Sep 17 00:00:00 2001
From: Milan Broz <gmazyland@gmail.com>
Date: Sun, 25 Jul 2021 21:56:37 +0200
Subject: [PATCH] Support build with older libssh.

The function ssh_session_is_known_server() was introduced later,
fallback to older version if libssh is available.
---
 configure.ac           | 1 +
 tokens/ssh/ssh-utils.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index 1d0e0c0e..9279ed34 100644
--- a/configure.ac
+++ b/configure.ac
@@ -402,6 +402,7 @@ AC_CHECK_DECLS([json_object_deep_copy], [], [], [#include <json-c/json.h>])
 dnl Check for libssh for SSH plugin
 if test "x$enable_ssh_token" = "xyes"; then
 	PKG_CHECK_MODULES([LIBSSH], [libssh])
+	AC_CHECK_DECLS([ssh_session_is_known_server], [], [], [#include <libssh/libssh.h>])
 fi
 
 dnl Crypto backend configuration.
diff --git a/tokens/ssh/ssh-utils.c b/tokens/ssh/ssh-utils.c
index 2c663683..ab1915b4 100644
--- a/tokens/ssh/ssh-utils.c
+++ b/tokens/ssh/ssh-utils.c
@@ -123,7 +123,11 @@ ssh_session sshplugin_session_init(struct crypt_device *cd, const char *host, co
 		goto out;
 	}
 
+#if HAVE_DECL_SSH_SESSION_IS_KNOWN_SERVER
 	r = ssh_session_is_known_server(ssh);
+#else
+	r = ssh_is_server_known(ssh);
+#endif
 	if (r != SSH_SERVER_KNOWN_OK) {
 		crypt_log(cd, CRYPT_LOG_ERROR, _("Server not known: "));
 		r = SSH_AUTH_ERROR;