tcp.cpp

listen to what are they talking,窃听源码

#include <windows.h>
#include <winsock.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int sd_connect =-1, sd_bind =-1, sd_accept =-1;
int wsa_ok =0;
int tcp_init()
{
    WSAData wsa;

    sd_bind =sd_connect =sd_accept =-1;
    if(WSAStartup(MAKEWORD(1, 1), &wsa) !=0)
        return -1;
    wsa_ok =1;

	return 0;
}

int tcp_exit()
{
  if(sd_connect >=0) closesocket(sd_connect);
  if(sd_accept >=0) closesocket(sd_accept);
  if(sd_bind >=0) closesocket(sd_bind);
  if(wsa_ok) WSACleanup();
  sd_connect =sd_accept =sd_bind =-1;

  return 0;
}

int tcp_status(int  sd, char *type, int timeout)
{
  fd_set rset, wset, eset;
  fd_set FAR *prset =NULL, *pwset =NULL, *peset =NULL;
  struct timeval tval;
  int i, status, err_no =0;
  time_t t1, t2;
  MSG msg;

  tval.tv_sec =0;
  tval.tv_usec =0;
  time(&t1);
  t2 =t1;
  while(t2-t1 < timeout)
  {
    FD_ZERO(&rset);
    FD_ZERO(&wset);
    FD_ZERO(&eset);

    for(i =0; i<(int)strlen(type); i++)
    {
      if(type[i] =='r') { FD_SET(sd, &rset); prset =&rset; }
      if(type[i] =='w') { FD_SET(sd, &wset); pwset =&wset; }
      if(type[i] =='e') { FD_SET(sd, &eset); peset =&eset; }
    }
    status =select(sd+1, prset, pwset, peset, &tval);
    time(&t2);
    if(status ==0)
    {
      if(PeekMessage(&msg, 0, NULL, NULL, PM_REMOVE))
      {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
        if(msg.message ==WM_QUIT) return -1;
      }
      if(t2-t1 <timeout) continue;
      else
      {
        if(prset) FD_CLR((UINT)sd,&rset);
        if(pwset) FD_CLR((UINT)sd,&wset);
        if(peset) FD_CLR((UINT)sd,&eset);
        SetLastError(WSAETIMEDOUT);
        return -10;
      }
    }

    if(peset && FD_ISSET(sd, peset))
    {
      if(prset !=NULL) FD_CLR((UINT)sd,&rset);
      if(pwset !=NULL) FD_CLR((UINT)sd,&wset);
      if(peset !=NULL) FD_CLR((UINT)sd,&eset);
      err_no =WSAGetLastError();
      /*
      len =sizeof(errno);
      getsockopt(sd, SOL_SOCKET, SO_ERROR, (char *)&errno, &len);
      */
      return -1;
    }
    if((prset && FD_ISSET(sd, prset)) || (pwset && FD_ISSET(sd, pwset)))
    {
      err_no =WSAGetLastError();
      /*
      len =sizeof(errno);
      getsockopt(sd, SOL_SOCKET, SO_ERROR, (char *)&errno, &len);
      */
    }
    if(prset !=NULL) FD_CLR((UINT)sd,&rset);
    if(pwset !=NULL) FD_CLR((UINT)sd,&wset);
    if(peset !=NULL) FD_CLR((UINT)sd,&eset);

    if(status <0)
      err_no =WSAGetLastError();
    if(err_no ==WSAEINTR) return WSAEINTR;
    if(err_no)
    {
      return -1;
    }
    else break;
  }
  return 0;
}

int tcp_bind(HWND hWnd, int port)
{
	struct sockaddr_in addr;
    char temp[200];
    int sd;

    sd =-1;
	if((sd =socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) <0)
	{
		sprintf(temp, "socket failed! errno:%d", WSAGetLastError());
		return -1;
	}

	memset(&addr, 0, sizeof(addr));

	addr.sin_family =AF_INET;
	addr.sin_port =htons((unsigned short)port);
    int l =1;
    setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&l, sizeof(l));
    /*setsockopt(sd, SOL_SOCKET, SO_REUSEPORT, (char *)&l, sizeof(l));*/
	if(bind(sd, (struct sockaddr *)&addr, sizeof(addr)) <0)
	{
      sprintf(temp, "bind failed! errno:%d", WSAGetLastError());
	  closesocket(sd);
      return -1;
	}
	if(hWnd && WSAAsyncSelect(sd, hWnd, WM_APP+100, FD_READ|FD_ACCEPT) !=0)
    {
      sprintf(temp, "tcp_bind:WSAAsyncSelect failed!");
      closesocket(sd);
      return -2;
    }
    sd_bind =sd;
    listen(sd_bind, 5);
    return sd;
}

int tcp_accept(int sd, int timeout)
{
  int sd_acc =-1;
  struct sockaddr_in sa;
  int len;
  /*unsigned long l;*/

  if(tcp_status(sd, "rw", timeout) <0)
    return -1;
  len =sizeof(sa);
  if((sd_acc =accept(sd, (struct sockaddr *)&sa, &len)) <0)
    return -1;
  sd_accept =sd_acc;
  /*  l =1;
    if(ioctlsocket(sd_acc, FIONBIO, &l) <0)
    {
      closesocket(sd);
      return -1;
    }*/
  return sd_acc;
}

int tcp_connect(char *hostname, int port, int timeout)
{
	struct hostent *hp;
	struct sockaddr_in addr;
    char temp[200];
    unsigned long ul;
    long l;
    int sd =-1;

    sd =-1;
	if((sd =socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) <0)
	{
		sprintf(temp, "socket failed! errno:%d", WSAGetLastError());
		return -1;
	}

	memset(&addr, 0, sizeof(addr));

    ul =inet_addr(hostname);
    if(ul ==0xffffffff)
    {
	  if((hp =gethostbyname(hostname)) ==NULL)
	  {
        sprintf(temp, "gethostbyname and inet_addr failed! errno:%d", WSAGetLastError());
	    closesocket(sd);
        return -1;
      }
	  memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
	}
    else  addr.sin_addr.s_addr=ul;

	addr.sin_family =AF_INET;
	addr.sin_port =htons((unsigned short)port);
    l =1;
    /*if(ioctlsocket(sd, FIONBIO, (unsigned long *)&l) <0)
    {
      closesocket(sd);
      return -1;
    }*/
    if(setsockopt(sd, IPPROTO_TCP, TCP_NODELAY, (char *)&l, sizeof(l)) <0)
    {
      closesocket(sd);
      return -1;
    }

    while(connect(sd, (struct sockaddr *)&addr, sizeof(addr)) !=0)
    {
      int err_no =WSAGetLastError();
      if(err_no ==WSAEINTR) continue;
	  if(err_no ==WSAEINPROGRESS) break;
      sprintf(temp, "connect:连接服务器失败!\n检查服务器端程序是否运行\n且主机地址是否%s, 端口是否%d\n errno=%d",
              hostname, port, err_no);
      closesocket(sd);
	  return -1;
	}
    if(tcp_status(sd, "w", timeout) <0)
    {
      sprintf(temp, "status:连接服务器失败!\n检查服务器端程序是否运行\n且主机地址是否%s, 端口是否%d\n"
                    "errno=%d",
            hostname, port, WSAGetLastError());
      closesocket(sd);
      return -1;
    }

    sd_connect =sd;
    return sd;
}

void tcp_disconnect(int sd)
{
  if(sd >0)
  {
    closesocket(sd);
    if(sd ==sd_connect) sd_connect =-1;
    if(sd ==sd_accept) sd_accept =-1;
	if(sd ==sd_bind) sd_bind =-1;
  }
}

void tcp_close(int sd)
{
	tcp_disconnect(sd);
}

int tcp_send(int sd, char *buf, int len, int timeout)
{
  int len1, len_send =0;
  time_t t1, t2;

  len_send =0;
  time(&t1);
  t2 =t1;
  while(len_send <len)
  {
    if(t2-t1 >timeout)
      return len_send;
    if(tcp_status(sd, "w", timeout-(t2-t1)) <0)
      return len_send;
    if((len1 =send(sd, &buf[len_send], len-len_send, 0)) <=0)
    {
      /*if(GetLastError() ==WSAEWOULDBLOCK)
      {
        time(&t2);
        continue;
      }*/
      return len_send;
    }
    len_send +=len1;
    time(&t2);
  }

  return len_send;
}

int tcp_recv(int sd, char *buf, int len, int timeout)
{
  int len1, len_recv;
  time_t t2, t1;

  len_recv =0;
  time(&t1);
  t2 =t1;
  while(len_recv <len)
  {
    if(t2 -t1 >timeout)
      return len_recv;
    if(tcp_status(sd, "r", timeout-(t2-t1)) <0)
      return len_recv;

     if((len1 =recv(sd, &buf[len_recv], len-len_recv, 0)) <=0)
     {
       /*if(timeout ==0) break;
       if(GetLastError() ==WSAEWOULDBLOCK)
       {
         time(&t2);
         continue;
       }*/
       return len_recv;
    }
    len_recv +=len1;
    time(&t2);
  }
  return len_recv;
}