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DoH: add bad HTTP/2 requests logging

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Add some error logging when facing bad requests over HTTP/2. Log the
address and the error description.
This commit is contained in:
Artem Boldariev
2021-12-30 13:16:05 +02:00
parent 5630df8712
commit a38b4945c1
1 changed files with 39 additions and 11 deletions
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50
lib/isc/netmgr/http.c
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@@ -19,6 +19,7 @@
#include <string.h>
#include <isc/base64.h>
#include <isc/log.h>
#include <isc/netmgr.h>
#include <isc/print.h>
#include <isc/sockaddr.h>
@@ -1925,9 +1926,9 @@ server_send_response(nghttp2_session *ngsession, int32_t stream_id,
return (ISC_R_SUCCESS);
}
#define MAKE_ERROR_REPLY(tag, code) \
{ \
tag, MAKE_NV2(":status", #code) \
#define MAKE_ERROR_REPLY(tag, code, desc) \
{ \
tag, MAKE_NV2(":status", #code), desc \
}
/*
@@ -1938,17 +1939,43 @@ server_send_response(nghttp2_session *ngsession, int32_t stream_id,
static struct http_error_responses {
const isc_http_error_responses_t type;
const nghttp2_nv header;
const char *desc;
} error_responses[] = {
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_SUCCESS, 200),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_NOT_FOUND, 404),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_PAYLOAD_TOO_LARGE, 413),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_URI_TOO_LONG, 414),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_UNSUPPORTED_MEDIA_TYPE, 415),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_BAD_REQUEST, 400),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_NOT_IMPLEMENTED, 501),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_GENERIC, 500),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_SUCCESS, 200, "OK"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_BAD_REQUEST, 400, "Bad Request"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_NOT_FOUND, 404, "Not Found"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_PAYLOAD_TOO_LARGE, 413,
"Payload Too Large"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_URI_TOO_LONG, 414, "URI Too Long"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_UNSUPPORTED_MEDIA_TYPE, 415,
"Unsupported Media Type"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_GENERIC, 500, "Internal Server Error"),
MAKE_ERROR_REPLY(ISC_HTTP_ERROR_NOT_IMPLEMENTED, 501, "Not Implemented")
};
static void
log_server_error_response(const isc_nmsocket_t *socket,
const struct http_error_responses *response) {
const int log_level = ISC_LOG_DEBUG(1);
isc_sockaddr_t client_addr;
isc_sockaddr_t local_addr;
char client_sabuf[ISC_SOCKADDR_FORMATSIZE];
char local_sabuf[ISC_SOCKADDR_FORMATSIZE];
if (!isc_log_wouldlog(isc_lctx, log_level)) {
return;
}
client_addr = isc_nmhandle_peeraddr(socket->h2.session->handle);
local_addr = isc_nmhandle_localaddr(socket->h2.session->handle);
isc_sockaddr_format(&client_addr, client_sabuf, sizeof(client_sabuf));
isc_sockaddr_format(&local_addr, local_sabuf, sizeof(local_sabuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_NETMGR,
log_level, "HTTP/2 request from %s (on %s) failed: %s %s",
client_sabuf, local_sabuf, response->header.value,
response->desc);
}
static isc_result_t
server_send_error_response(const isc_http_error_responses_t error,
nghttp2_session *ngsession, isc_nmsocket_t *socket) {
@@ -1965,6 +1992,7 @@ server_send_error_response(const isc_http_error_responses_t error,
i < sizeof(error_responses) / sizeof(error_responses[0]); i++)
{
if (error_responses[i].type == error) {
log_server_error_response(socket, &error_responses[i]);
return (server_send_response(
ngsession, socket->h2.stream_id,
&error_responses[i].header, 1, socket));