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How to get the full HTTP request URL using Apache httpd API and request_rec?

I am writing an Apache module in C and I’m looking to apply a regular expression across the entire HTTP URL for the current request (via request_rec). I cannot find any member of request_rec that contains this information. I’ve tried

  • the_request
  • unparsed_uri
  • uri
  • ap_get_server_name(r)
  • path_info
  • parsed_uri.path

… to name a few.

How can I get the entire URL as a single char *?

I understand this question is similar to the one linked below, but this is for the C language (they’re using C++) and their solution (I tried anyways) has not worked for me.

How to get the full HTTP request URL using Apache httpd API (request_rec)?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I was not able to find this information already available in the httpd API (as Cheatah suggested), so I used the following function to build the information myself.

    DISCLAIMER: When I was testing this against the url sub.localhost/a/b/c?query=param the port values under request_rec were unpopulated, so I'm not attempting at this time to handle different ports as it's not important for my use-case.

    const char *buildUrl(request_rec *r)
{
    char *url = apr_pcalloc(r->pool, urlMaxLength);

    // <scheme>://<host><:port(IFF!=80)><unparsed-uri>
    snprintf(url, urlMaxLength, "%s://%s%s%s",
        ap_http_scheme(r),
        r->hostname,
        "", // could not get port # from request_rec... let's just assume that won't be needed...
        r->unparsed_uri
    );

    return url;
}

  2. 0 
    static int on_request(request_rec *r) {

  // Substraction for request uri (r->uri is broken when use mod_rewrite)
  char *request_uri = calloc(strlen(r->the_request), 1);
  long unsigned int i;
  for(i = strlen(r->method) + 1; i <= (strlen(r->the_request) - strlen(r->protocol) - 1); i++) {
      request_uri[i - strlen(r->method) - 1] = r->the_request[i];
  }

  // Use it

  free(request_uri);

  // ...

    For http://example.com/abc/def.html?ghi=jkl the request_uri is /abc/def.html?ghi=jkl.

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