I don't think you want to replace the handler.
I suggest reading how mod_auth_form uses mod_request to do similar
stuff w/ the body before the handler sees it.
On Mon, May 11, 2020 at 1:30 PM harshil fadia
<hartz_2004@xxxxxxxxx.invalid> wrote:
>
> How do I implement below requirement? Please help..
>
> Read POST request body >> Take out some data from request body >> Set particular response header attribute based on request attribute >> Send response back to client
>
>
> What I have tried to do so far is wrote Apache module in C, read the Post body and set response header. I am calling my custom module using SetHandler so I am losing the original server response and response becomes null. Where as, what I want to have is the actual server response to be sent to client and additionally I append one more parameter in response header.
>
> 1. httpd.conf
>
> LoadModule example_module /usr/lib64/httpd/modules/mycustommodule.so
>
> <VirtualHost HOSTNAME:80>
> <Location /elasticsearch/_msearch>
> SetHandler readbody-handler #calling my custom module
> </Location>
>
> #My KIBANA application is running on 5601 on same machine
> ProxyPass / http://localhost:5601/
> ProxyPassReverse / http://localhost:5601/
>
> </VirtualHost>
>
>
> 2. My custom C module
>
> module AP_MODULE_DECLARE_DATA readbody_module = {
> STANDARD20_MODULE_STUFF,
> NULL, /*Per-directory configuration handler */
> NULL, /*Merge handler for per-directory configurations */
> NULL, /*Per-server configuration handler */
> NULL, /*Merge handler for per-server configurations */
> NULL,
> regiter_hooks /*Our hook registering function */
> };
>
> static void register_hooks(apr_pool_t *pool)
> {
> ap_hook_handler(readbody_handler, NULL, NULL, -10);
> }
>
> static int readbody_handler(request_rec *r)
> {
> const char *buffer;
>
> if (!r->handler || strcmp(r->handler, "readbody-handler")) return (DECLINED);
>
> if (util_read(r, &buffer) == OK) //reading the body and assigning it into buffer
> {
> char s[2] = ":";
> char s2[2] = "\"";
> char *indexname;
> indexname = strtok(buffer, s);
> indexname = strtok(NULL, s);
> indexname = strtok(indexname, s2);
> indexname = strtok(NULL, s2);
> apr_table_setn(r->headers_out, "IndexPattern", indexname); //setting up response header
> }
>
> return OK;
> }
>
> static int util_read(request_rec *r, const char **rbuf)
> {
> int rc;
> if ((rc = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR)) != OK)
> {
> return rc;
> }
> if (ap_should_client_block(r))
> {
> char argsbuffer[HUGE_STRING_LEN];
> int rsize, len_read, rpos = 0;
> long length = r->remaining;
> *rbuf = apr_pcalloc(r->pool, length + 1);
> while ((len_read = ap_get_client_block(r, argsbuffer, sizeof(argsbuffer))) > 0)
> {
> if ((rpos + len_read) > length)
> {
> rsize = length - rpos;
> }
> else
> {
> rsize = len_read;
> }
> memcpy((char*) *rbuf + rpos, argsbuffer, rsize);
> rpos += rsize;
> }
> }
> }
> return rc;
>
>
> Regards,
> Harshil Fadia
>
--
Eric Covener
covener@xxxxxxxxx
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