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ACCESS_LOG: truncate referrer always leaving enough room for at least an empty useragent and delimiters

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This commit is contained in:
Andy Green 2017-09-06 08:39:58 +08:00
parent f8fad0d350
commit 4046239bc8
1 changed files with 10 additions and 2 deletions
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12
lib/libwebsockets.c
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@ -3270,9 +3270,17 @@ lws_access_log(struct lws *wsi)
if (!p1)
p1 = "";
l = lws_snprintf(ass, sizeof(ass) - 1, "%s %d %lu \"%s\" \"%s\"\n",
/*
* We do this in two parts to restrict an oversize referrer such that
* we will always have space left to append an empty useragent, while
* maintaining the structure of the log text
*/
l = lws_snprintf(ass, sizeof(ass) - 7, "%s %d %lu \"%s",
wsi->access_log.header_log,
wsi->access_log.response, wsi->access_log.sent, p1, p);
wsi->access_log.response, wsi->access_log.sent, p1);
if (strlen(p) > sizeof(ass) - 6 - l)
p[sizeof(ass) - 6 - l] = '\0';
l += lws_snprintf(ass + l, sizeof(ass) - 1 - l, "\" \"%s\"\n", p);
if (wsi->vhost->log_fd != (int)LWS_INVALID_FILE) {
if (write(wsi->vhost->log_fd, ass, l) != l)