Downgrade IP version warnings to avoid filling logs

Downgrade logs and backtraces about IP versions to
info-level. Only log backtraces once each time tor runs.

Assists in diagnosing bug 18351; bugfix on c3cc8e16e in
tor-0.2.8.1-alpha.

Reported by "sysrqb" and "Christian", patch by "teor".

1 files changed, 16 insertions, 5 deletions

diff --git a/src/or/directory.c b/src/or/directory.c
index e4feda44fc..c95944b6f2 100644
--- a/src/or/directory.c
+++ b/src/or/directory.c
@@ -674,13 +674,17 @@ directory_choose_address_routerstatus(const routerstatus_t *status,
 
   /* We rejected both addresses. This isn't great. */
   if (!have_or && !have_dir) {
-    log_warn(LD_BUG, "Rejected all OR and Dir addresses from %s when "
+    static int logged_backtrace = 0;
+    log_info(LD_BUG, "Rejected all OR and Dir addresses from %s when "
              "launching a directory connection to: IPv4 %s OR %d Dir %d "
              "IPv6 %s OR %d Dir %d", routerstatus_describe(status),
              fmt_addr32(status->addr), status->or_port,
              status->dir_port, fmt_addr(&status->ipv6_addr),
              status->ipv6_orport, status->dir_port);
-    log_backtrace(LOG_WARN, LD_BUG, "Addresses came from");
+    if (!logged_backtrace) {
+      log_backtrace(LOG_INFO, LD_BUG, "Addresses came from");
+      logged_backtrace = 1;
+    }
     return -1;
   }
 
@@ -1100,14 +1104,21 @@ directory_initiate_command_rend(const tor_addr_port_t *or_addr_port,
 
   if (or_connection && (!or_addr_port->port
                         || tor_addr_is_null(&or_addr_port->addr))) {
+    static int logged_backtrace = 0;
     log_warn(LD_DIR, "Cannot make an OR connection without an OR port.");
-    log_backtrace(LOG_WARN, LD_BUG, "Address came from");
+    if (!logged_backtrace) {
+      log_backtrace(LOG_INFO, LD_BUG, "Address came from");
+      logged_backtrace = 1;
+    }
     return;
   } else if (!or_connection && (!dir_addr_port->port
                                 || tor_addr_is_null(&dir_addr_port->addr))) {
+    static int logged_backtrace = 0;
     log_warn(LD_DIR, "Cannot make a Dir connection without a Dir port.");
-    log_backtrace(LOG_WARN, LD_BUG, "Address came from");
-
+    if (!logged_backtrace) {
+      log_backtrace(LOG_INFO, LD_BUG, "Address came from");
+      logged_backtrace = 1;
+    }
     return;
   }