curl/src/tool_main.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2014, 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 "tool_setup.h"

#include <sys/stat.h>

#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif

#define ENABLE_CURLX_PRINTF
/* use our own printf() functions */
#include "curlx.h"

#include "tool_cfgable.h"
#include "tool_convert.h"
#include "tool_msgs.h"
#include "tool_operate.h"
#include "tool_panykey.h"
#include "tool_vms.h"
#include "tool_main.h"

/*
 * This is low-level hard-hacking memory leak tracking and similar. Using
 * the library level code from this client-side is ugly, but we do this
 * anyway for convenience.
 */
#include "memdebug.h" /* keep this as LAST include */

#ifdef __VMS
/*
 * vms_show is a global variable, used in main() as parameter for
 * function vms_special_exit() to allow proper curl tool exiting.
 * Its value may be set in other tool_*.c source files thanks to
 * forward declaration present in tool_vms.h
 */
int vms_show = 0;
#endif

/* if we build a static library for unit tests, there is no main() function */
#ifndef UNITTESTS

/*
 * Ensure that file descriptors 0, 1 and 2 (stdin, stdout, stderr) are
 * open before starting to run.  Otherwise, the first three network
 * sockets opened by curl could be used for input sources, downloaded data
 * or error logs as they will effectively be stdin, stdout and/or stderr.
 */
static void main_checkfds(void)
{
#ifdef HAVE_PIPE
  int fd[2] = { STDIN_FILENO, STDIN_FILENO };
  while(fd[0] == STDIN_FILENO ||
        fd[0] == STDOUT_FILENO ||
        fd[0] == STDERR_FILENO ||
        fd[1] == STDIN_FILENO ||
        fd[1] == STDOUT_FILENO ||
        fd[1] == STDERR_FILENO)
    if(pipe(fd) < 0)
      return;   /* Out of handles. This isn't really a big problem now, but
                   will be when we try to create a socket later. */
  close(fd[0]);
  close(fd[1]);
#endif
}

#ifdef CURLDEBUG
static void memory_tracking_init(void)
{
  char *env;
  /* if CURL_MEMDEBUG is set, this starts memory tracking message logging */
  env = curlx_getenv("CURL_MEMDEBUG");
  if(env) {
    /* use the value as file name */
    char fname[CURL_MT_LOGFNAME_BUFSIZE];
    if(strlen(env) >= CURL_MT_LOGFNAME_BUFSIZE)
      env[CURL_MT_LOGFNAME_BUFSIZE-1] = '\0';
    strcpy(fname, env);
    curl_free(env);
    curl_memdebug(fname);
    /* this weird stuff here is to make curl_free() get called
       before curl_memdebug() as otherwise memory tracking will
       log a free() without an alloc! */
  }
  /* if CURL_MEMLIMIT is set, this enables fail-on-alloc-number-N feature */
  env = curlx_getenv("CURL_MEMLIMIT");
  if(env) {
    char *endptr;
    long num = strtol(env, &endptr, 10);
    if((endptr != env) && (endptr == env + strlen(env)) && (num > 0))
      curl_memlimit(num);
    curl_free(env);
  }
}
#else
#  define memory_tracking_init() Curl_nop_stmt
#endif

/*
 * This is the main global constructor for the app. Call this before
 * _any_ libcurl usage. If this fails, *NO* libcurl functions may be
 * used, or havoc may be the result.
 */
static CURLcode main_init(void)
{
#if defined(__DJGPP__) || defined(__GO32__)
  /* stop stat() wasting time */
  _djstat_flags |= _STAT_INODE | _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
#endif

  return curl_global_init(CURL_GLOBAL_DEFAULT);
}

/*
 * This is the main global destructor for the app. Call this after
 * _all_ libcurl usage is done.
 */
static void main_free(void)
{
  curl_global_cleanup();
  convert_cleanup();
  metalink_cleanup();
}

/*
** curl tool main function.
*/
int main(int argc, char *argv[])
{
  int res;
  struct Configurable *config;

  main_checkfds();

#if defined(HAVE_SIGNAL) && defined(SIGPIPE)
  (void)signal(SIGPIPE, SIG_IGN);
#endif

  /* Initialize memory tracking */
  memory_tracking_init();

  /* Allocate the initial config */
  config = malloc(sizeof(struct Configurable));

  if(config) {
    /* Initialise the config */
    init_config(config);

    /* Initialize the curl library - do not call any libcurl functions before
       this point */
    if(!main_init()) {
      /* Start our curl operation */
      res = operate(config, argc, argv);

      /* Perform the main cleanup */
      main_free();
    }
    else {
      helpf(config->errors, "error initializing curl library\n");
      res = CURLE_FAILED_INIT;
    }

#ifdef __SYMBIAN32__
    if(config->showerror)
      tool_pressanykey();
#endif

    /* Free the config structure */
    free_config_fields(config);
    Curl_safefree(config);
  }
  else {
    helpf(stderr, "error initializing curl\n");
    res = CURLE_FAILED_INIT;
  }

#ifdef __NOVELL_LIBC__
  if(getenv("_IN_NETWARE_BASH_") == NULL)
    tool_pressanykey();
#endif

#ifdef __VMS
  vms_special_exit(res, vms_show);
#else
  return res;
#endif
}

#endif /* ndef UNITTESTS */