网络编程中一些小函数

#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>

#include <net/if.h>
#include <net/if_arp.h>
#include <arpa/inet.h>
#include <errno.h>


typedef long LONG;
typedef char CHAR;
#define CONST const

#ifndef  SUCCESS
#define  SUCCESS             0
#endif

#ifndef  FAIL
#define  FAIL               -1
#endif



LONG GetMac(CONST CHAR *pcIfName, CHAR *pcMac)
{ 
    if (NULL == pcIfName || NULL == pcMac)
    {
        printf("NULL == pcIfName || NULL == pcMac\n");
        return FAIL;
    }
    
    LONG lFd = 0, lRet = FAIL; 
    struct ifreq ifr;
    memset(&ifr, 0, sizeof(ifr)); 
    strcpy(ifr.ifr_name, pcIfName); 
    
    lFd = socket(AF_INET, SOCK_STREAM, 0); 
    if(lFd < 0)
    { 
        printf("socket fail\n");
        return FAIL; 
    } 

    //lRet = ioctl(lFd, SIOCGIFHWADDR, &ifr, sizeof(ifr)); 
	lRet = ioctl(lFd, SIOCGIFHWADDR, &ifr); 
    if(0 == lRet) 
    { 
        memcpy(pcMac, ifr.ifr_hwaddr.sa_data, 6);
		printf("\nifr.ifr_hwaddr.sa_data is %s   \n",ifr.ifr_hwaddr.sa_data);
        close(lFd); 
        return SUCCESS;
    }   
    else   
    { 
        printf("ioctl fail\n");
        close(lFd);
        return FAIL;
    }
}

LONG GetIp(CONST CHAR *pcIfName, CHAR *pcIp)
{ 
    if (NULL == pcIfName || NULL == pcIp)
    {
        printf("NULL == pcIfName || NULL == pcIp\n");
        return FAIL;
    }
    
    LONG lFd = 0, lRet = FAIL; 
    struct ifreq ifr;
    memset(&ifr, 0, sizeof(ifr)); 
    strcpy(ifr.ifr_name, pcIfName); 
    
    lFd = socket(AF_INET, SOCK_STREAM, 0); 
    if(lFd < 0)
    { 
        printf("socket fail\n");
        return FAIL; 
    } 

    lRet = ioctl(lFd, SIOCGIFADDR, &ifr); 
    if(0 == lRet) 
    { 
        strncpy(pcIp,inet_ntoa(((struct sockaddr_in*)&(ifr.ifr_addr))->sin_addr),16);
        close(lFd); 
        return SUCCESS;
    }   
    else   
    { 
        printf("ioctl fail\n");
        close(lFd);
        return FAIL;
    }
}


int main()
{
    LONG lRet = FAIL;
    CHAR szMac[6] = {0};
	CHAR szIp[16] = {0};
	
    CHAR szID[21] = {0};
	int i=0;
	int ulLen = 0;	
    
    lRet = GetMac("eth0", szMac);
	
	for(i = 0; i < sizeof(szMac); i++)
    {
        //sprintf(szID + strlen((const char*)szID), "%02X", szMac[i]);
		//ulLen = snprintf(szID, 1024, "%02X", szMac[i]);
		//ulLen +=snprintf((szID + ulLen), 1024, "%02X", szMac[i]);
		printf("%0x,",szMac[i]);
    }
	printf("\nlRet is %d,mac is %s\n",lRet,szID);
	
	lRet = GetIp("eth0", szIp);
	
	printf("lRet is %d,szIp is %s\n",lRet,szIp);

	return 0;
}

 

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