@Eric,Let me read that what you have suggested. My problem is, the POST
request coming is not a login form but it is un-parsable JSON string
(application/x-ndjson). I am using some C string function to extract that part
from request and setting it in the response header as part of my C code. But as
is said, actual response body is lost by using SetHandler.
@Anthony,
You are right, that is just typo on my post Anthony. Actual code/config is good
and compiled successfully. I am also able to set response header but my problem
is that I am using SetHandler directive and that way I am getting actual
response from server. Probably request is getting hijacked by SetHandler
directive.
So what should be right way to trigger my C code which can set response header
but also continue its routine flow to go to backend server and get actual
response body, is the question.
*Thank you for responses*
RegardsHarshil
On Monday, 11 May, 2020, 02:19:34 pm GMT-4, Antony G
<[email protected]> wrote:
Hello Harshil Fadia,
Just to be sure that the below are just typing errors.
1) In the util_read procedure, the statement return rc; is outside the brackets
And
2) You have different name in the MODULE DEFINITION (regiter_hooks) and in the
name of the procedure (register_hooks)
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)
Regards
From: harshil fadia <[email protected]>
Sent: Monday, May 11, 2020 8:30 PM
To: [email protected]
Subject: [users@httpd] Apache HTTPD: Read POST request body and set response
header
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
