Bug #8405: Report SOCKS username/password in CIRC status events

Introduces two new circuit status name-value parameters: SOCKS_USERNAME
and SOCKS_PASSWORD. Values are enclosing in quotes and unusual characters
are escaped.

Example:

    650 CIRC 5 EXTENDED [...] SOCKS_USERNAME="my_username" SOCKS_PASSWORD="my_password"

1 files changed, 14 insertions, 0 deletions

diff --git a/src/or/control.c b/src/or/control.c
index 00cb4311fb..e963aeab7f 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -1882,6 +1882,20 @@ circuit_describe_status_for_controller(origin_circuit_t *circ)
     smartlist_add_asprintf(descparts, "TIME_CREATED=%s", tbuf);
   }
 
+  // Show username and/or password if available.
+  if (circ->socks_username_len > 0) {
+    char* socks_username_escaped = esc_for_log_len(circ->socks_username,
+                                     (size_t) circ->socks_username_len);
+    smartlist_add_asprintf(descparts, "SOCKS_USERNAME=%s", socks_username_escaped);
+    tor_free(socks_username_escaped);
+  }
+  if (circ->socks_password_len > 0) {
+    char* socks_password_escaped = esc_for_log_len(circ->socks_password,
+                                     (size_t) circ->socks_password_len);
+    smartlist_add_asprintf(descparts, "SOCKS_PASSWORD=%s", socks_password_escaped);
+    tor_free(socks_password_escaped);
+  }
+
   rv = smartlist_join_strings(descparts, " ", 0, NULL);
 
   SMARTLIST_FOREACH(descparts, char *, cp, tor_free(cp));