socket.c

一个C语言编写的串口程序

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#include <unistd.h>

#define sockOpenFail	-12001
#define sockBindFail	-12002
#define sockGetSockName	-12003
#define sockSendFail	-12004
#define sockRecvFail	-12005
#define sockUnknowHost 	-12006
#define sockConnectFail	-12007
#define sockAcceptFail	-12008
#define sockUnknowServ 	-12009
#define sockgetnameFail	-12010
#define sockgetpeerFail	-12011
#define sockListenError	-12012

int SockClientOpen(char *pszHost,char *sinPort);
int sockClientOpen(char *pszHost,int sinPort);
int SockServerOpen(char *sinPort,int Listenum);
int sockServerOpen(int sinPort,  int Listenum);
int sockClose(int sHandle);
int sockSend(int sHandle,char *pszBuf,int iLen);
int sockRecv(int sHandle,char *pszBuf,int iMaxLen);
int sockListen(int sHandle);
int sockLook(int sHandle);

extern int errno;
extern char **environ;

/*static int Listensock;*/

int SockClientOpen( char *pszHost, char *sinPort )
{
   int sHandle;
   u_long hl;
   struct sockaddr_in server;
   struct hostent *hp,*gethostbyname();
   struct servent *sp,*getservbyname();
   

   if( ( sHandle = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ) < 0 ) 
   {
	  ShowMsg("clinetopen:socket : %d,%s\n",errno,strerror(errno));
      return sockOpenFail;
   }

   memset((char *)&server,0,sizeof(struct sockaddr_in));
   server.sin_family=AF_INET;

   /*server.sin_port = htons(sinPort);*/
   if( ( sp = getservbyname(sinPort,"tcp"))==NULL )
   {
  	 ShowMsg("getservbyname : %d,%s\n",errno,strerror(errno));
         return sockUnknowServ;
   }
   server.sin_port =sp->s_port;

   /*hl=inet_addr(pszHost); 
     memcpy( (char *)&server.sin_addr, (char *)&hl, 4 ); */
   if( ( hp = gethostbyname( pszHost ) ) == NULL ) 
   {
  	 ShowMsg("gethostbyname : %d,%s\n",errno,strerror(errno));
         return sockUnknowHost;
   }
   memcpy( (char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length );


   if( connect( sHandle, (struct sockaddr *)&server, sizeof(server) ) < 0 ) 
   {
	  ShowMsg("connect : %d,%s\n",errno,strerror(errno));
      close(sHandle);
      return sockConnectFail;
   }
   return( sHandle );
}

int sockClientOpen( char *pszHost, int sinPort )
{
   int sHandle;
   u_long hl;
   struct sockaddr_in server;
   struct hostent *hp,*gethostbyname();
   struct servent *sp,*getservbyname();
   

   if( ( sHandle = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ) < 0 ) 
   {
	  ShowMsg("clinetopen:socket : %d,%s\n",errno,strerror(errno));
      return sockOpenFail;
   }

   memset((char *)&server,0,sizeof(struct sockaddr_in));
   server.sin_family=AF_INET;

   server.sin_port = htons(sinPort);
   /*if( ( sp = getservbyname(sinPort,"tcp"))==NULL )
   {
  	 ShowMsg("getservbyname : %d,%s\n",errno,strerror(errno));
         return sockUnknowServ;
   }
   server.sin_port =sp->s_port;*/

   hl=inet_addr(pszHost); 
   memcpy( (char *)&server.sin_addr, (char *)&hl, 4 );
   /*if( ( hp = gethostbyname( pszHost ) ) == NULL ) 
   {
  	 ShowMsg("gethostbyname : %d,%s\n",errno,strerror(errno));
         return sockUnknowHost;
   }
   memcpy( (char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length );
   */


   if( connect( sHandle, (struct sockaddr *)&server, sizeof(server) ) < 0 ) 
   {
	  ShowMsg("connect : %d,%s\n",errno,strerror(errno));
      close(sHandle);
      return sockConnectFail;
   }
   return( sHandle );
}

int SockServerOpen( char *sinPort,int Listenum)
{
   int sHandle;
   int iLen;
   /*int LISTEN;*/
   struct sockaddr_in server;
   struct servent *sp,*getservbyname();

   /*LISTEN=atoi(getenv("LISTEN"));*/
   /*if (LISTEN ==0) LISTEN=20;*/
   /*if (LISTEN <= 0)
   {
	  ShowMsg("env :LISTEN  not found or error\n");
      return sockListenError;
   }*/


   if( ( sHandle = socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return sockOpenFail;
   }

   memset((char *)&server, 0, sizeof(struct sockaddr_in));
   server.sin_family = AF_INET;
   server.sin_addr.s_addr = INADDR_ANY;
  /* server.sin_port = htons(sinPort); */
   if( ( sp = getservbyname(sinPort,"tcp"))==NULL )
   {
  	 ShowMsg("getservbyname : %d,%s\n",errno,strerror(errno));
         return sockUnknowServ;
   }
   server.sin_port =sp->s_port;

   if( bind( sHandle, ( struct sockaddr * )&server, sizeof(server) ) < 0 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return sockBindFail;
   }


   iLen = sizeof( server );
   if( getsockname( sHandle,( struct sockaddr * )&server, &iLen ) < 0 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return sockGetSockName;
   }

   listen(sHandle,Listenum);

   return (sHandle);
}

int sockServerOpen( int   sinPort,int Listenum)
{
   int sHandle;
   int iLen;
   /*int LISTEN; */
   struct sockaddr_in server;
   struct servent *sp,*getservbyname();

   /*LISTEN=atoi(getenv("LISTEN"));*/
   /*if (LISTEN ==0) LISTEN=20;*/
   /*if (LISTEN <= 0)
   {
	  ShowMsg("env :LISTEN  not found or error\n");
      return sockListenError;
   }*/


   if( ( sHandle = socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return sockOpenFail;
   }

   memset((char *)&server, 0, sizeof(struct sockaddr_in));
   server.sin_family = AF_INET;
   server.sin_addr.s_addr = INADDR_ANY;
   server.sin_port = htons(sinPort); 
   /*if( ( sp = getservbyname(sinPort,"tcp"))==NULL )
   {
  	 ShowMsg("getservbyname : %d,%s\n",errno,strerror(errno));
         return sockUnknowServ;
   }
   server.sin_port =sp->s_port;*/

   if( bind( sHandle, ( struct sockaddr * )&server, sizeof(server) ) < 0 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return sockBindFail;
   }


   iLen = sizeof( server );
   if( getsockname( sHandle,( struct sockaddr * )&server, &iLen ) < 0 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return sockGetSockName;
   }

   listen(sHandle,Listenum);

   return (sHandle);
}


int sockClose( int sHandle )
{
   close( sHandle );
   return( 0 );
}

int sockSend( int sHandle, char *pszBuf, int iLen )
{
   int iRet;

   iRet = send( sHandle, pszBuf, iLen, 0 );
   if( iRet < 0 ) {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
		return( sockSendFail );
	}
   return( 0 );
}

int sockRecv( int sHandle, char *pszBuf, int iMaxLen )
{
   int iRet;

   iRet = recv( sHandle, pszBuf, iMaxLen, 0 );
   if( iRet < 0 ) {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
	   return( sockRecvFail );
   }
   return ( iRet );
}

int sockListen( int sHandle )
{
   int iSock;

   iSock = accept( sHandle, ( struct sockaddr * )NULL, ( int * )NULL );
   if ( iSock == -1 ) 
   {
	  ShowMsg("sockcomm : %d,%s\n",errno,strerror(errno));
      return( sockAcceptFail );
   }
   return(iSock);
}

int sockLook(int sHandle)
{  
  struct sockaddr_in server;
  int len,ret;
  char sHostAddr[20];
  int port;
  len=sizeof(server);
  ret=getsockname(sHandle,(struct sockaddr * ) &server,&len);
  if ( ret != 0)
   {
	  ShowMsg("sockLook : %d,%s\n",errno,strerror(errno));
      return( sockgetnameFail );
   }

   sprintf(sHostAddr, "%s", inet_ntoa(server.sin_addr));  
   port=ntohs(server.sin_port);
   ShowMsg("local ip:port = %s:%d \n",sHostAddr,port); 

   ret=getpeername(sHandle,(struct sockaddr * ) &server,&len);
   if ( ret != 0)
   {
	  ShowMsg("sockLook : %d,%s\n",errno,strerror(errno));
      return( sockgetpeerFail );
   }

   sprintf(sHostAddr, "%s", inet_ntoa(server.sin_addr));  
   port=ntohs(server.sin_port);
   ShowMsg("remote ip port = %s:%d \n",sHostAddr,port); 
   
}