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From "Sivadoss, Pradosh" <pradosh.sivad...@logicacmg.com>
Subject RE: Apache doesnt close connection with the client
Date Fri, 03 Nov 2006 16:43:58 GMT
Connection: close

In the HTTP request header, will take care of it. 

-----Original Message-----
From: amol tambe [mailto:amol_ideas@yahoo.com] 
Sent: Friday, November 03, 2006 8:56 AM
To: modules-dev@httpd.apache.org
Subject: Apache doesnt close connection with the client


Hello,

I am trying to write a protocol module for Apache which will encrypt
data and send to-from Apache. (I can not use mod_SSL for some reasons).
My module code builds and loads fine.
After the module is loaded, when I send a simple GET request to my
Apache server as follows
	https://localhost/cgi-bin/hello_name.exe?name=Rhino

I get the expected output from my CGI at the client but then my client
hangs waiting for more response/data from the server.

Since this is a protocol module, it directly reads from socket and
writes to the socket. The functions that read and write to a socket
respectively are
SSCryptoRead() and SSCryptoWrite(). After I read the data using
SSCryptoRead, I insert it into the buckets so that is passed to my
content generator which is the CGI (hello_name.exe) as shown in the URL
above. Then in the output filters, I grab the generated data and encrypt
and send it back to the client using function SSCryptoWrite.

I doubt if my problem could be related to not inserting and EOS bucket.
But I am not sure if I am supposed to enter an EOS bucket or Apache
would do it for me.
I am also not sure if I need so set something like KEEP-ALIVE or CLOSE
in my request or response. Since my code is much like SSL, I tried
looking up the SSL code but I could not find anything of help. Can
anyone point me to what might be missing here? Are there any special
steps to be taken while writing a protocol module? 

An extract of my module code is pasted below...


module AP_MODULE_DECLARE_DATA  ss_module = {
    STANDARD20_MODULE_STUFF,
    NULL,
    NULL,
    ss_config_server_create,
    NULL,
    ss_config_cmds,
    ss_register_hooks
};


static void ss_register_hooks (apr_pool_t *p) {
	ap_register_input_filter  (ss_io_filter, ss_io_filter_input,
NULL, AP_FTYPE_CONNECTION + 5);
	ap_register_output_filter (ss_io_filter, ss_io_filter_output,
NULL, AP_FTYPE_CONNECTION + 5);
	ap_hook_post_config       (ss_init_Module,           
 NULL, NULL, APR_HOOK_MIDDLE);
	ap_hook_pre_connection   
(ss_hook_pre_connection,NULL,NULL, APR_HOOK_MIDDLE); }

static apr_status_t ss_io_filter_input(ap_filter_t *f,
apr_bucket_brigade *bb, ap_input_mode_t mode, apr_read_type_e block,
apr_off_t readbytes) {
	.
	.
	.
	len =
SSSecureRead(inctx->filter_ctx->session_ctx->session,
buf, &len);
	if (len > 0) {
		apr_bucket *bucket =
apr_bucket_transient_create(inctx->buffer, len,
f->c->bucket_alloc);
		APR_BRIGADE_INSERT_TAIL(bb, bucket);
	}
	return APR_SUCCESS;
}

static apr_status_t ss_io_filter_output(ap_filter_t *f,
apr_bucket_brigade *bb) {
	.
	.
	.
	while (!APR_BRIGADE_EMPTY(bb)) {
		apr_bucket *bucket = APR_BRIGADE_FIRST(bb);

		if (APR_BUCKET_IS_EOS(bucket) ||
APR_BUCKET_IS_FLUSH(bucket)) {
			if (ss_filter_out_flush(filter_ctx->pWriteptr) <
0)

				status = outctx->rc;
			break;
		}
		else if (AP_BUCKET_IS_EOC(bucket)) {
			if ((status = ap_pass_brigade(f->next, bb)) !=
APR_SUCCESS) 
				return status;
			break;
		}
		else {
			const char *data;
			apr_size_t len;
			/*Read the data from the buckets and write it to
the socket*/
			status = apr_bucket_read(bucket, &data, &len,
rblock);
			res =
SSCryptoWrite(filter_ctx->session_ctx->session, data, len);
		}
	}

	return APR_SUCCESS;
}

Any suggestions/pointers would be highly appreciated.

Thanks,


Amol


 
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