.NET CLR Injection: Modify IL Code during Run-time

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/
#include "test.h"

#include "testtrace.h"
#include "memdebug.h"

#ifdef LIB585

static int counter;

static curl_socket_t tst_opensocket(void *clientp,
                                    curlsocktype purpose,
                                    struct curl_sockaddr *addr)
{
  (void)clientp;
  (void)purpose;
  printf("[OPEN] counter: %d\n", ++counter);
  return socket(addr->family, addr->socktype, addr->protocol);
}

static int tst_closesocket(void *clientp, curl_socket_t sock)
{
  (void)clientp;
  printf("[CLOSE] counter: %d\n", counter--);
  return sclose(sock);
}

static void setupcallbacks(CURL *curl)
{
  curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, tst_opensocket);
  curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, tst_closesocket);
  counter = 0;
}

#else
#define setupcallbacks(x) Curl_nop_stmt
#endif


int test(char *URL)
{
  CURLcode res;
  CURL *curl;
  char *ipstr=NULL;

  if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK) {
    fprintf(stderr, "curl_global_init() failed\n");
    return TEST_ERR_MAJOR_BAD;
  }

  if ((curl = curl_easy_init()) == NULL) {
    fprintf(stderr, "curl_easy_init() failed\n");
    curl_global_cleanup();
    return TEST_ERR_MAJOR_BAD;
  }

  test_setopt(curl, CURLOPT_URL, URL);
  test_setopt(curl, CURLOPT_HEADER, 1L);

  libtest_debug_config.nohex = 1;
  libtest_debug_config.tracetime = 1;
  test_setopt(curl, CURLOPT_DEBUGDATA, &libtest_debug_config);
  test_setopt(curl, CURLOPT_DEBUGFUNCTION, libtest_debug_cb);
  test_setopt(curl, CURLOPT_VERBOSE, 1L);

  if(libtest_arg3 && !strcmp(libtest_arg3, "activeftp"))
    test_setopt(curl, CURLOPT_FTPPORT, "-");

  setupcallbacks(curl);

  res = curl_easy_perform(curl);

  if(!res) {
    FILE *moo;
    res = curl_easy_getinfo(curl, CURLINFO_PRIMARY_IP, &ipstr);
    moo = fopen(libtest_arg2, "wb");
    if(moo) {
      double time_namelookup;
      double time_connect;
      double time_pretransfer;
      double time_starttransfer;
      double time_total;
      fprintf(moo, "IP: %s\n", ipstr);
      curl_easy_getinfo(curl, CURLINFO_NAMELOOKUP_TIME, &time_namelookup);
      curl_easy_getinfo(curl, CURLINFO_CONNECT_TIME, &time_connect);
      curl_easy_getinfo(curl, CURLINFO_PRETRANSFER_TIME, &time_pretransfer);
      curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME,
                        &time_starttransfer);
      curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &time_total);

      /* since the timing will always vary we only compare relative differences
         between these 5 times */
      if(time_namelookup >= time_connect) {
        fprintf(moo, "namelookup vs connect: %f %f\n",
                time_namelookup, time_connect);
      }
      if(time_connect >= time_pretransfer) {
        fprintf(moo, "connect vs pretransfer: %f %f\n",
                time_connect, time_pretransfer);
      }
      if(time_pretransfer >= time_starttransfer) {
        fprintf(moo, "pretransfer vs starttransfer: %f %f\n",
                time_pretransfer, time_starttransfer);
      }
      if(time_starttransfer >= time_total) {
        fprintf(moo, "starttransfer vs total: %f %f\n",
                time_starttransfer, time_total);
      }

      fclose(moo);
    }
  }

test_cleanup:

  curl_easy_cleanup(curl);
  curl_global_cleanup();

  return (int)res;
}