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-rw-r--r--include/libssh/callbacks.h16
-rw-r--r--src/messages.c11
2 files changed, 27 insertions, 0 deletions
diff --git a/include/libssh/callbacks.h b/include/libssh/callbacks.h
index a838bdce..5fd7dd1e 100644
--- a/include/libssh/callbacks.h
+++ b/include/libssh/callbacks.h
@@ -569,6 +569,18 @@ typedef int (*ssh_channel_env_request_callback) (ssh_session session,
const char *env_name,
const char *env_value,
void *userdata);
+/**
+ * @brief SSH channel subsystem request from a client.
+ * @param channel the channel
+ * @param subsystem the subsystem required
+ * @param userdata Userdata to be passed to the callback function.
+ * @returns 0 if the subsystem request is accepted
+ * @returns 1 if the request is denied
+ */
+typedef int (*ssh_channel_subsystem_request_callback) (ssh_session session,
+ ssh_channel channel,
+ const char *subsystem,
+ void *userdata);
struct ssh_channel_callbacks_struct {
@@ -630,6 +642,10 @@ struct ssh_channel_callbacks_struct {
* variable to be set.
*/
ssh_channel_env_request_callback channel_env_request_function;
+ /** This function will be called when a client requests a subsystem
+ * (like sftp).
+ */
+ ssh_channel_subsystem_request_callback channel_subsystem_request_function;
};
typedef struct ssh_channel_callbacks_struct *ssh_channel_callbacks;
diff --git a/src/messages.c b/src/messages.c
index 450b3236..d1e88765 100644
--- a/src/messages.c
+++ b/src/messages.c
@@ -198,6 +198,17 @@ static int ssh_execute_server_callbacks(ssh_session session, ssh_message msg){
ssh_message_reply_default(msg);
return SSH_OK;
}
+ } else if(msg->channel_request.type == SSH_CHANNEL_REQUEST_SUBSYSTEM){
+ if(ssh_callbacks_exists(channel->callbacks, channel_subsystem_request_function)){
+ rc = channel->callbacks->channel_subsystem_request_function(session, channel,
+ msg->channel_request.subsystem,
+ channel->callbacks->userdata);
+ if(rc == 0)
+ ssh_message_channel_request_reply_success(msg);
+ else
+ ssh_message_reply_default(msg);
+ return SSH_OK;
+ }
}
break;
case SSH_REQUEST_SERVICE: