teraterm/teraterm/WSAAsyncGetAddrInfo.c

/*
 * Copyright (C) 2010-2019 TeraTerm Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * WSAAsyncGetAddrInfo.c -- asynchronous version of getaddrinfo
 * Copyright(C) 2000-2003 Jun-ya Kato <kato@win6.jp>
 */
#include <winsock2.h>
#include <ws2tcpip.h>
#include <wspiapi.h>
#include <windows.h>
#include <process.h>
#if !defined(_CRTDBG_MAP_ALLOC)
#define _CRTDBG_MAP_ALLOC
#endif
#include <stdlib.h>
#include <crtdbg.h>
#include "WSAAsyncGetAddrInfo.h"
#include "ttwsk.h"

struct getaddrinfo_args {
  HWND hWnd;
  unsigned int wMsg;
  char *hostname;
  char *portname;
  struct addrinfo hints;
  struct addrinfo **res;
  HANDLE *lpHandle;
};

static unsigned __stdcall getaddrinfo_thread(void * p);

HANDLE PASCAL WSAAsyncGetAddrInfo(HWND hWnd, unsigned int wMsg,
                           const char *hostname,
                           const char *portname,
                           struct addrinfo *hints,
                           struct addrinfo **res)
{
        HANDLE thread;
        unsigned tid;
        struct getaddrinfo_args * ga;

        /*
        * allocate structure to pass args to sub-thread dynamically
        * WSAAsyncGetAddrInfo() is reentrant
        */
        if ((ga = (struct getaddrinfo_args *)malloc(sizeof(struct getaddrinfo_args))) == NULL)
                return NULL;

        /* packing arguments struct addrinfo_args */
        ga->hWnd = hWnd;
        ga->wMsg = wMsg;
        ga->hostname = _strdup(hostname); // �|�C���^�����n�����A�X���b�h�����s���������B(2012.11.7 yutaka)
        ga->portname = _strdup(portname);
        ga->hints = *hints; // �|�C���^�����n�����A�X���b�h�����s���������B(2016.3.11 yutaka)
        ga->res = res;

        ga->lpHandle = (HANDLE *)malloc(sizeof(HANDLE));
        if (ga->lpHandle == NULL) {
                free(ga->hostname);
                free(ga->portname);
                return NULL;
        }

        /* create sub-thread running getaddrinfo() */
        thread = (HANDLE)_beginthreadex(NULL, 0, getaddrinfo_thread, ga, CREATE_SUSPENDED, &tid);
        if (thread == 0) {
                free(ga->lpHandle);
                free(ga->hostname);
                free(ga->portname);
                free(ga);
                return NULL;    // return error
        }

        /* return thread handle */
        *ga->lpHandle = thread;
        ResumeThread(thread);
        return thread;
}

static unsigned __stdcall getaddrinfo_thread(void * p)
{
        int gai;
        HWND hWnd;
        unsigned int wMsg;
        const char *hostname;
        const char *portname;
        struct addrinfo *hints;
        struct addrinfo **res;
        struct getaddrinfo_args *ga;

        /* unpacking arguments */
        ga = (struct getaddrinfo_args *)p;
        hWnd = ga->hWnd;
        wMsg = ga->wMsg;
        hostname = ga->hostname;
        portname = ga->portname;
        hints = &ga->hints;
        res = ga->res;

        /* call getaddrinfo */
//      gai = Pgetaddrinfo(hostname, portname, hints, res);
        gai = getaddrinfo(hostname, portname, hints, res);

        /* send value of gai as message to window hWnd */
        PostMessage(hWnd, wMsg, (WPARAM)*ga->lpHandle, MAKELPARAM(0, gai));

        free(ga->lpHandle);
        free(ga->hostname);
        free(ga->portname);
        free(p);

        return 0;
}