[pmg-devel] [PATCH v2 log-tracker] close #2106: show outgoing TLS connection in tracking center

[Mira Limbeck <m.limbeck@proxmox.com>]

This is a best effort try to add the outgoing TLS connection information
to the output of pmg-log-tracker. The only thing we can match on is the
PID of the 'smtp' process. In the code we asumme that the TLS log entry
always happens before the actual smtp send entry that has a QID. This means
we save the TLS log entry in a map with the PID as key and then, once the
send entry happens, we look it up and add the log entry to the QEntry's
logs.

Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>
---
v2:
 - added 'Untrusted' line match as well

 src/main.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 5069252..a186620 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -378,6 +378,18 @@ fn handle_qmgr_message(msg: &[u8], parser: &mut Parser, complete_line: &[u8]) {
 
 // handle log entries for 'lmtp', 'smtp', 'error' and 'local'
 fn handle_lmtp_message(msg: &[u8], parser: &mut Parser, complete_line: &[u8]) {
+    if msg.starts_with(b"Trusted TLS connection established to")
+        || msg.starts_with(b"Untrusted TLS connection established to")
+    {
+        // the only way to match outgoing TLS connections is by smtp pid
+        // this message has to appear before the 'qmgr: <QID>: removed' entry in the log
+        parser.smtp_tls_log_by_pid.insert(
+            parser.current_record_state.pid,
+            (complete_line.into(), parser.lines),
+        );
+        return;
+    }
+
     let (qid, data) = match parse_qid(msg, 15) {
         Some((q, t)) => (q, t),
         None => return,
@@ -393,6 +405,14 @@ fn handle_lmtp_message(msg: &[u8], parser: &mut Parser, complete_line: &[u8]) {
         .log
         .push((complete_line.into(), parser.lines));
 
+    // assume the TLS log entry always appears before as it is the same process
+    if let Some(log_line) = parser
+        .smtp_tls_log_by_pid
+        .remove(&parser.current_record_state.pid)
+    {
+        qe.borrow_mut().log.push(log_line);
+    }
+
     let data = &data[2..];
     if !data.starts_with(b"to=<") {
         return;
@@ -1668,6 +1688,8 @@ struct Parser {
     fentries: HashMap<Box<[u8]>, Rc<RefCell<FEntry>>>,
     qentries: HashMap<Box<[u8]>, Rc<RefCell<QEntry>>>,
 
+    smtp_tls_log_by_pid: HashMap<u64, (Box<[u8]>, u64)>,
+
     current_record_state: RecordState,
     rel_line_nr: u64,
 
@@ -1705,6 +1727,7 @@ impl Parser {
             sentries: HashMap::new(),
             fentries: HashMap::new(),
             qentries: HashMap::new(),
+            smtp_tls_log_by_pid: HashMap::new(),
             current_record_state: Default::default(),
             rel_line_nr: 0,
             current_year: years,
-- 
2.20.1