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Nov 6, 2009, 7:37 AM
Post #1 of 1
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[Bug 48154] New: Requests through mod_isapi are not parsed by HTTP_INPUT filter
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https://issues.apache.org/bugzilla/show_bug.cgi?id=48154
Summary: Requests through mod_isapi are not parsed by
HTTP_INPUT filter
Product: Apache httpd-2
Version: 2.2.14
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: mod_isapi
AssignedTo: bugs[at]httpd.apache.org
ReportedBy: thickey[at]radiantsystems.com
Changes made to ap_http_filter in version 2.2.9 (Bug ID 43711) are preventing
requests through the mod_isapi, isapi_handler() function from being processed.
The changes for this bug are at line 327 of http_filters.c
...
if ((ctx->state == BODY_CHUNK ||
(ctx->state == BODY_LENGTH && ctx->remaining > 0)) &&
f->r->expecting_100 && f->r->proto_num >= HTTP_VERSION(1,1) &&
!(f->r->eos_sent || f->r->bytes_sent)) {
if (!ap_is_HTTP_SUCCESS(f->r->status)) {
ctx->state = BODY_NONE;
ctx->eos_sent = 1;
} else {
...
The specific problem is the call to "ap_is_HTTP_SUCCESS(f->r->status)"
I understand the reason behind the change it causes a problem due to the
request_rec status being set to 0 at line 1483 of mod_isap.c
...
r->status = 0
...
This would happen wiht any message but for my situation it is a POST message
and when initially handled by ap_read_request() the status is set to HTTP_OK
(200) I am not sure why the isapi_handler() function is setting the status to
0 other then perhaps to initialize the value as it is returned later. But
becuase this is done before the parse it prevents the message from being read
by the http input filter into cid->ecb->lpbData and therefore no data is passed
on to the external DLL.
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