[Openvpn-devel,v2,1/5] Implement parsing and sending INFO and INFO_PRE control messages

Message ID 20191109151306.18597-1-arne@rfc2549.org
State New
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Series
  • [Openvpn-devel,v2,1/5] Implement parsing and sending INFO and INFO_PRE control messages
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Commit Message

Arne Schwabe Nov. 9, 2019, 3:13 p.m.
OpenVPN 3 implements these messages to send information during the
authentication to the UI, implement these message also in OpenVPN 2.x

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
---
 src/openvpn/forward.c |  8 ++++++++
 src/openvpn/push.c    | 33 +++++++++++++++++++++++++++++++++
 src/openvpn/push.h    |  3 +++
 3 files changed, 44 insertions(+)

Patch

diff --git a/src/openvpn/forward.c b/src/openvpn/forward.c
index 8451706b..0f735384 100644
--- a/src/openvpn/forward.c
+++ b/src/openvpn/forward.c
@@ -395,6 +395,14 @@  check_incoming_control_channel_dowork(struct context *c)
             {
                 server_pushed_signal(c, &buf, false, 4);
             }
+            else if (buf_string_match_head_str(&buf, "INFO_PRE"))
+            {
+                server_pushed_info(c, &buf, 8);
+            }
+            else if (buf_string_match_head_str(&buf, "INFO"))
+            {
+                server_pushed_info(c, &buf, 4);
+            }
             else
             {
                 msg(D_PUSH_ERRORS, "WARNING: Received unknown control message: %s", BSTR(&buf));
diff --git a/src/openvpn/push.c b/src/openvpn/push.c
index 368b6920..ee1cb980 100644
--- a/src/openvpn/push.c
+++ b/src/openvpn/push.c
@@ -178,6 +178,39 @@  server_pushed_signal(struct context *c, const struct buffer *buffer, const bool
     }
 }
 
+void
+server_pushed_info(struct context *c, const struct buffer *buffer,
+                   const int adv)
+{
+    const char *m = "";
+    struct buffer buf = *buffer;
+
+    if (buf_advance(&buf, adv) && buf_read_u8(&buf) == ',' && BLEN(&buf))
+    {
+        m = BSTR(&buf);
+    }
+
+#ifdef ENABLE_MANAGEMENT
+    struct gc_arena gc;
+    if (management)
+    {
+        gc = gc_new();
+
+        /*
+         * We use >INFOMSG here instead of plain >INFO since INFO is used to
+         * for management greeting and we don't want to confuse the client
+         */
+        struct buffer out = alloc_buf_gc(256, &gc);
+        buf_printf(&out, ">%s:%s", "INFOMSG", m);
+        management_notify_generic(management, BSTR(&out));
+
+        gc_free(&gc);
+    }
+    #endif
+    msg(D_PUSH, "Info command was pushed by server ('%s')", m);
+}
+
+
 #if P2MP_SERVER
 /**
  * Add an option to the given push list by providing a format string.
diff --git a/src/openvpn/push.h b/src/openvpn/push.h
index 070782dd..9cf8fb34 100644
--- a/src/openvpn/push.h
+++ b/src/openvpn/push.h
@@ -50,6 +50,9 @@  void receive_auth_failed(struct context *c, const struct buffer *buffer);
 
 void server_pushed_signal(struct context *c, const struct buffer *buffer, const bool restart, const int adv);
 
+void server_pushed_info(struct context *c, const struct buffer *buffer,
+                        const int adv);
+
 void incoming_push_message(struct context *c, const struct buffer *buffer);
 
 #if P2MP_SERVER