[tor-commits] [tor/release-0.4.6] Upgrade and rate-limit compression failure message.

[dgoulet at torproject.org]

commit fc3d4e4c2fb527954780ba958659e70f35fffe6c
Author: Nick Mathewson <nickm at torproject.org>
Date:   Thu May 27 10:49:37 2021 -0400

    Upgrade and rate-limit compression failure message.
    
    Without this message getting logged at 'WARN', it's hard to
    contextualize the messages we get about compression bombs, so this
    message should fix #40175.
    
    I'm rate-limiting this, however, since it _could_ get spammy if
    somebody on the network starts acting up.  (Right now it should be
    very quiet; I've asked Sebastian to check it, and he says that he
    doesn't hit this message in practice.)
    
    Closes #40175.
---
 src/feature/dirclient/dirclient.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/feature/dirclient/dirclient.c b/src/feature/dirclient/dirclient.c
index a5dd856729..b589e829f9 100644
--- a/src/feature/dirclient/dirclient.c
+++ b/src/feature/dirclient/dirclient.c
@@ -1944,7 +1944,9 @@ dir_client_decompress_response_body(char **bodyp, size_t *bodylenp,
   /* If we're pretty sure that we have a compressed directory, and
    * we didn't manage to uncompress it, then warn and bail. */
   if (!plausible && !new_body) {
-    log_fn(LOG_PROTOCOL_WARN, LD_HTTP,
+    const int LOG_INTERVAL = 3600;
+    static ratelim_t warning_limit = RATELIM_INIT(LOG_INTERVAL);
+    log_fn_ratelim(&warning_limit, LOG_WARN, LD_HTTP,
            "Unable to decompress HTTP body (tried %s%s%s, on %s).",
            description1,
            tried_both?" and ":"",