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分享分享：Linux 下获取LAN中指定IP的网卡的MAC（物理地址）
此贴在我的blog上也有：http://blog.csdn.net/wenxy1/article/details/464168
Useage: ./lan_mac_scan [interface name of the IP] [IP] [ARP IP]
#./lan_mac_scan 本地网卡名字 本地网卡的IP地址 检查是否使用的IP地址
例如：
#./lan_mac_scan eth0 172.22.0.26 172.22.0.25
注意事项：
1. Unix类操作系统的内核已支持packet socket。
2. 需要root权限。
3. 只能在LAN中使用，ARP包不能跨越router，除非router上有ARP proxy.
4. 如果本地机器或者远程机器安装有firewall，ARP包会被过滤而失效。
由于基于2005年我写的C和C++混合的代码，当时我才毕业2年，所以代码风格极像VC++的并且模块结构化不好，我现在只从事Linux kernel开发，linux代码风格也向linux style靠拢。
给坛子里喜欢研究网络的朋友用。
Useage: ./lan_mac_scan [interface name of the IP] [IP] [ARP IP]
#./lan_mac_scan 本地网卡名字 本地网卡的IP地址 检查是否使用的IP地址
例如：
#./lan_mac_scan eth0 172.22.0.26 172.22.0.25
注意事项：
1. Unix类操作系统的内核已支持packet socket。
2. 需要root权限。
3. 只能在LAN中使用，ARP包不能跨越router，除非router上有ARP proxy.
4. 如果本地机器或者远程机器安装有firewall，ARP包会被过滤而失效。
由于基于2005年我写的C和C++混合的代码，当时我才毕业2年，所以代码风格极像VC++的并且模块结构化不好，我现在只从事Linux kernel开发，linux代码风格也向linux style靠拢。
给坛子里喜欢研究网络的朋友用。
################################################################################
# File: Makefile
# Description:
# Author: Xiaoyong Wen <wen_kernel@163.com>, 20130807, AM.
#
# Fix hisoty:
#
################################################################################
debug := 1
ifdef debug
CFLAGS += -g
else
CFLAGS += -O2
endif
#CC := g++
CC := gcc
target_bin := lan_mac_scan
bin := main
obj := main.o
#src := main.c
src := $(wildcard *.c) $(wildcard *.h)
.PHONY : clean all debug
all : $(bin)
cp main $(target_bin)
@-ls -l $(target_bin)
$(bin) : $(obj)
$(obj) : $(src)
debug:
@echo $(src)
@echo $(obj)
@echo $(CFLAGS)
@echo $(LDFLAGS)
clean:
rm -f $(bin) $(obj) $(target_bin)
...全文
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Wenxy1 2013-08-08
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// 填充MAC
static void set_hw_addr (char buf[], char *str)
{
int i;
char c, val;
for(i = 0; i < 6; i++)
{
if (!(c = tolower(*str++)))
perror("Invalid hardware address"),exit(1);
if (isdigit(c))
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c-'a'+10;
else
perror("Invalid hardware address"),exit(1);
buf[i] = val << 4;
if (!(c = tolower(*str++)))
perror("Invalid hardware address"),exit(1);
if (isdigit(c))
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c-'a'+10;
else
perror("Invalid hardware address"),exit(1);
buf[i] |= val;
if (*str == ':')
str++;
}
}
// 填充IP
static void set_ip_addr(char *buf, char *str)
{
struct in_addr addr;
memset(&addr, 0x00, sizeof(addr));
addr.s_addr = inet_addr(str);
memcpy(buf, &addr, 4);
}
//-------------------------------------------------------
// end file
Wenxy1 2013-08-08
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// 获取本地某网卡的MAC
// In: strEth
// Out: 若成功，返回MAC字符串，失败，返回""(空串)
static char * GetLocalMac(char *strEth)
{
int s;
struct ifreq buffer;
char chBuff[MAX_MAC_LEN];
unsigned int str_len = 0;
unsigned int offset = 0;
memset(chBuff, 0x0, sizeof(chBuff));
//arp_process(NULL);
s = socket(PF_INET, SOCK_DGRAM, 0);
if (-1 == s)
{
wenxy_debug("Error: create socket failture\n");
wenxy_debug("--------------------------------\n\n");
return "";
}
memset(&buffer, 0x00, sizeof(buffer));
strcpy(buffer.ifr_name, strEth); // "eth0"
if ( -1 == ioctl(s, SIOCGIFHWADDR, &buffer))
{
wenxy_debug("Error: 获取接口 %s MAC 失败\n", strEth);
wenxy_debug("--------------------------------\n\n");
return "";
}
close(s);
offset = 0;
for( s = 0; s < 6; s++ )
{
memset(chBuff, 0x0, sizeof(chBuff));
sprintf( chBuff, "%.2X", (unsigned char)buffer.ifr_hwaddr.sa_data[s]);
str_len = strlen(chBuff);
memcpy(strLocalMAC + offset, chBuff, str_len);
offset += str_len;
//wenxy_debug("%.2X", (unsigned char)buffer.ifr_hwaddr.sa_data[s]);
if (s < 5)
{
memset(chBuff, 0x0, sizeof(chBuff));
sprintf( chBuff, "%s", COMPART_MAC);
str_len = strlen(chBuff);
memcpy(strLocalMAC + offset, chBuff, str_len);
offset += str_len;
//wenxy_debug(":");
}
}
//wenxy_debug("\n");
return strLocalMAC;
}
//-------------------------------------------------------
// 发送ARP包，并接收ARP应答包，取出MAC
// In: strSrcIP:本机IP，strSrcMAC:本机IP的MAC，strDesIP:被请求应答MAC的IP , strNIC:本地接口名
// Out: 若成功，返回MAC，失败返回""(空串)
static char * GetMacByIP(char *strSrcIP, char *strSrcMAC, char *strDesIP, char *strNIC)
{
int sockfd; // socket handle
struct arp_packet arp; // arp 请求包
struct arp_packet arpRes; // arp 应用答包
struct sockaddr sa; // eth
char chSrcIP[24];
char chDesIP[24];
char chSrcMAC[24];
char chNIC[8];
unsigned int str_len = 0;
unsigned int offset = 0;
int i;
int s;
find_ip_flag = 0;
memset(chSrcIP, 0x00, sizeof(chSrcIP));
memset(chDesIP, 0x00, sizeof(chDesIP));
memset(chSrcMAC, 0x00, sizeof(chSrcMAC));
memset(chNIC, 0x00, sizeof(chNIC));
sprintf(chSrcIP, "%s", strSrcIP);
sprintf(chDesIP, "%s", strDesIP);
sprintf(chSrcMAC, "%s", strSrcMAC);
sprintf(chNIC, "%s", strNIC);
#define SRC_IP chSrcIP // 源IP
#define DES_IP chDesIP // 目的IP
#define LOCAL_HW chSrcMAC // eth0的MAC
#define DEVICE chNIC // 本机接口名
memset(&arp, 0x00, sizeof(arp));
memset(&arpRes, 0x00, sizeof(arpRes));
#if 1
wenxy_debug("源IP[%s] 源MAC[%s] 目的IP[%s]\n", strSrcIP, strSrcMAC, strDesIP);
#endif
sockfd = socket(AF_INET, SOCK_PACKET, htons(0x0806));
if(sockfd < 0)
{
wenxy_debug("Error: create socket failed\n");
wenxy_debug("--------------------------------\n\n");
return "";
}
/*
// 设置socket为非阻塞模式
if ( -1 != fcntl(sockfd, F_SETFL, O_NONBLOCK) )
{
wenxy_debug("设置socket为非阻塞模式成功\n");
}
else
{
wenxy_debug("Warning: 设置socket为非阻塞模式失败[errno = %d]\n", errno);
}
*/
// 设置socket接收超时
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec= 100;
if ( 0 == setsockopt( sockfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) )
{
wenxy_debug("设置socket接收超时成功\n");
}
else
{
wenxy_debug("Warning: 设置socket接收超时失败[errno = %d]\n", errno);
}
#if 1
wenxy_debug("创建socket SOCK_PACKET 成功\n");
wenxy_debug("Note: 创建ARP请求包 ......\n");
wenxy_debug("--------------------------------\n\n");
#endif
// 创建ARP请求包
/* init arp packet header */
arp.ethhdr.ether_type = htons(FRAME_TYPE);
set_hw_addr( (char *)arp.ethhdr.ether_dhost, DES_MAC );
set_hw_addr( (char *)arp.ethhdr.ether_shost, LOCAL_HW );
#if 1
wenxy_debug("%x|", arp.ethhdr.ether_type);
for (i = 0; i < 6; i++)
{
wenxy_debug("%d_", arp.ethhdr.ether_dhost[i]);
}
wenxy_debug("|");
for (i = 0; i < 6; i++)
{
wenxy_debug("%d_", arp.ethhdr.ether_shost[i]);
}
wenxy_debug("\n--------------------------------\n");
wenxy_debug("初始化ARP包帧头(以太网首部)成功\n\n");
#endif
/* init arp packet data */
wenxy_debug("初始化ARP包帧数据(ARP请求分组) ......\n");
wenxy_debug("--------------------------------\n");
arp.arphdr.ar_hrd = htons(HARD_TYPE); // 1
arp.arphdr.ar_pro = htons(PROTO_TYPE); // 0x0800
arp.arphdr.ar_op = htons(OP_CODE); // 1
arp.arphdr.ar_hln = (unsigned char)(6);
arp.arphdr.ar_pln = (unsigned char)(4);
#if 1
wenxy_debug("%d|%d|%d|%d|%d|\n", arp.arphdr.ar_hrd, arp.arphdr.ar_pro,
arp.arphdr.ar_op, arp.arphdr.ar_hln, arp.arphdr.ar_pln);
wenxy_debug("--------------------------------\n");
#endif
set_hw_addr((char *)arp.arphdr.__ar_tha, DES_MAC); // 请求IP的MAC
set_hw_addr((char *)arp.arphdr.__ar_sha, LOCAL_HW); // 发送者的MAC
set_ip_addr((char *)arp.arphdr.__ar_tip, DES_IP); // 请求MAC的IP
set_ip_addr((char *)arp.arphdr.__ar_sip, SRC_IP); // 源IP
bzero(arp.padding, 18); // 填充18个字节
#if 1
for (i = 0; i < 6; i++)
{
wenxy_debug("%d_", arp.arphdr.__ar_sha[i]);
}
wenxy_debug("|");
for (i = 0; i < 6; i++)
{
wenxy_debug("%d_", arp.arphdr.__ar_sip[i]);
}
wenxy_debug("|");
for (i = 0; i < 6; i++)
{
wenxy_debug("%d_", arp.arphdr.__ar_tha[i]);
}
wenxy_debug("|");
for (i = 0; i < 6; i++)
{
wenxy_debug("%d_", arp.arphdr.__ar_tip[i]);
}
wenxy_debug("|");
wenxy_debug("\n--------------------------------\n");
#endif
/* send arp reply packet */
memset(&sa, 0x00, sizeof(sa));
strcpy(sa.sa_data, DEVICE);
// 发送ARP包
int nSendCount = ARP_SEND_COUNT;
int nRecvByte = 0;
while( (nSendCount --) > 0)
{
wenxy_debug("发送ARP请求包[%d Bytes]...... [第%d个]\n", sizeof(arp), nSendCount);
if( sendto(sockfd, &arp, sizeof(arp), 0, (struct sockaddr*) &sa, sizeof(sa)) < 0 )
{
wenxy_debug("Error: 发送ARP包失败 [errno = %d]\n", errno);
return "";
}
// 接收ARP应答包
wenxy_debug("Note: 接收ARP应答 ......\n");
int nTryCount = RX_ARP_COUNT;
int nAddrLen = sizeof(sa);
do
{
/* because network and host delay */
usleep(SLEEP_MAX_US);
nRecvByte = recvfrom(sockfd, &arpRes, sizeof(arpRes),0, (struct sockaddr*)&sa, (socklen_t*)&nAddrLen);
// 若是所请求IP的ARP应答包，退出while
if ( nRecvByte >= 60 && 2 == ntohs(arpRes.arphdr.ar_op) )
{
char chBuff[MAX_MAC_LEN];
// 格式化IP
offset = 0;
for (s = 0; s < 4; s++)
{
memset(chBuff, 0x00, sizeof(chBuff));
sprintf( (char *)chBuff, "%d", (unsigned char)arpRes.arphdr.__ar_sip[s]);
//wenxy_debug("chBuff: %s\n", chBuff);
//strTarIP += chBuff;
str_len = strlen(chBuff);
memcpy(strTarIP + offset, chBuff, str_len);
offset += str_len;
if (s < 3)
{
memset(chBuff, 0x00, sizeof(chBuff));
sprintf( (char *)chBuff, "%s", ".");
//strTarIP += chBuff;
str_len = 1;
memcpy(strTarIP + offset, chBuff, str_len);
offset += str_len;
}
}
if ( !strcmp(strTarIP, strDesIP) )
{
wenxy_debug("\n请求IP[%s] = 应答IP[%s]\n", strDesIP, strTarIP);
find_ip_flag = 1; /* find ip */
goto analyse_arp_response;
}
}
}while( nTryCount -- ); // 接收ARP应答包的次数
}
analyse_arp_response:
wenxy_debug("已接收到ARP应答包 [%d Bytes]\n", nRecvByte);
// 接收超时，或错误
if ( nRecvByte == -1 )
{
wenxy_debug("Warning: 接收超时，或计算机[%s]没有响应\n", strDesIP);
close(sockfd);
return "";
}
wenxy_debug("分析ARP应答包 ......\n");
char chBuff[MAX_MAC_LEN];
memset(chBuff, 0x00, sizeof(chBuff));
// 格式化IP
offset = 0;
for (s = 0; s < 4; s++)
{
memset(chBuff, 0x00, sizeof(chBuff));
sprintf( (char *)chBuff, "%d", (unsigned char)arpRes.arphdr.__ar_sip[s]);
//strTarIP += chBuff;
str_len = strlen(chBuff);
memcpy(strTarIP + offset, chBuff, str_len);
offset += str_len;
if (s < 3)
{
memset(chBuff, 0x00, sizeof(chBuff));
sprintf( (char *)chBuff, "%s", ".");
//strTarIP += chBuff;
str_len = strlen(chBuff);
memcpy(strTarIP + offset, chBuff, str_len);
offset += str_len;
}
}
// 格式化MAC
memset(chBuff, 0x00, sizeof(chBuff));
offset = 0;
for (s = 0; s < 6; s++)
{
memset(chBuff, 0x00, sizeof(chBuff));
sprintf( (char *)chBuff, "%02X", (unsigned char)arpRes.arphdr.__ar_sha[s]);
//strTarMAC += chBuff;
str_len = strlen(chBuff);
memcpy(strTarMAC + offset, chBuff, str_len);
offset += str_len;
if (s < 5)
{
memset(chBuff, 0x00, sizeof(chBuff));
sprintf( (char *)chBuff, "%s", COMPART_MAC);
//strTarMAC += chBuff;
str_len = strlen(chBuff);
memcpy(strTarMAC + offset, chBuff, str_len);
offset += str_len;
}
}
// 输出目的IP，目的MAC
wenxy_debug("应答IP[%s] 对应的MAC[%s]\n", strTarIP, strTarMAC);
wenxy_debug("\n--------------------------------\n\n");
close(sockfd);
// 返回被请求的MAC
strcpy(strDesMAC, strTarMAC);
/* return */
return strDesMAC;
}
Wenxy1 2013-08-08
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/*******************************************************************************
* File: main.c
* Description:
* Author: Xiaoyong Wen <wen_kernel@163.com>, 2005/06/20,a.m.
*
* Fix hisoty:
* v1.1.0 Xiaoyong Wen <wen_kernel@163.com>, 20130808, p.m., Reconstruct to c code
*
*******************************************************************************/
#define DEBUG /* show debug info only */
#if defined(DEBUG)
#define wenxy_debug(fmt, args...) \
printf(fmt, ##args)
#else
#define wenxy_debug(fmt, ...)
#endif
#include <unistd.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <string.h>
#include <errno.h>
// ---------------------
// 创建ARP包的头文件
#include<netinet/in.h>
#include<arpa/inet.h>
/* #include<linux/if_ether.h> */
#include<ctype.h>
#include <fcntl.h>
// ---------------------
#define MAX_MAC_LEN 24 // MAC字串缓冲区的最大长度(byte)
#define COMPART_MAC ":" // MAC字串的分格符, Warnning:修改此宏，必须再修改源程序!!!
#define MAX_BUF_LEN 128
static char strETH[MAX_BUF_LEN] = {0}; // 本机NIC名称
static char strLocalMAC[MAX_BUF_LEN] = {0}; // 本机MAC
static char strSrcIP[MAX_BUF_LEN] = {0}; // 本机IP
static char strDesMAC[MAX_BUF_LEN] = {0}; // 目的MAC
static char strDesIP[MAX_BUF_LEN] = {0}; // 目的IP
static char strTarIP[MAX_BUF_LEN] = {0}; /* Target IP address */
static char strTarMAC[MAX_BUF_LEN] = {0}; /* Target hardware address */
static int find_ip_flag = 0; /* 1 means find, 0 means not find */
// function declare
static char * GetLocalMac(char *strEth); // get loacl NIC's MAC
static void set_ip_addr(char *,char *); // 填充IP
static void set_hw_addr(char buf[], char *str); // 填充MAC
static char * GetMacByIP(char *strSrcIP, char *strSrcMAC, char *strDesIP ,char *strNIC); // 获取指定IP的MAC
int arp_main( char *nic_name, char *nic_ip, char *des_ip);
/*
#define SRC_IP "10.0.1.77" // 源IP
#define DES_IP "10.0.1.35" // 目的IP
#define LOCAL_HW "00:C0:4C:39:0D:6F" // 10.0.1.77的eth0的MAC
#define DEVICE "eth0" // 接口
*/
#define PADD_MAC "00:00:00:00:00:00" // 填充的MAC
#define DES_MAC "FF:FF:FF:FF:FF:FF" // 广播MAC
#define ARP_SEND_COUNT 3 // 发送ARP请求的ARP包的个数
#define RX_ARP_COUNT 3 // rx count of ARP response
#define SLEEP_MAX_US (1000 * 100) /* unit microsecond */
struct ether_header
{
unsigned char ether_dhost[6]; /* destination eth addr */
unsigned char ether_shost[6]; /* source ether addr */
unsigned short ether_type; /* packet type ID field */
};
struct arp_header
{
unsigned short int ar_hrd; /* Format of hardware address. */
unsigned short int ar_pro; /* Format of protocol address. */
unsigned char ar_hln; /* Length of hardware address. */
unsigned char ar_pln; /* Length of protocol address. */
// -------------------------
unsigned short int ar_op; /* ARP opcode (command). */
unsigned char __ar_sha[6]; /* Sender hardware address. */
unsigned char __ar_sip[4]; /* Sender IP address. */
unsigned char __ar_tha[6]; /* Target hardware address. */
unsigned char __ar_tip[4]; /* Target IP address. */
// -------------------------
};
struct arp_packet
{
struct ether_header ethhdr;
struct arp_header arphdr;
unsigned char padding[18]; /* filled with 0 */
};
/* arp reply:
* op = 2
* ethhdr.ether_dhost = arphdr.__ar_tha = switch hard addr
* ethhdr.ether_shost = arphdr.__ar_sha = local hard addr
* arphdr.__ar_tip = switch ip
* arphdr.__ar_sip = victim ip
*/
#define FRAME_TYPE 0x0806 /* arp=0x0806,rarp=0x8035 */
#define HARD_TYPE 1 /* ethernet is 1 */
#define PROTO_TYPE 0x0800 /* IP is 0x0800 */
#define OP_CODE 1 /* arp=1/2,1为请求，2为应答,rarp=3/4 */
int main( int argc, char *argv[] )
{
// 检查参数
if ( argc != 4 )
{
wenxy_debug("Useage: %s [interface name of the IP] [IP] [ARP IP]\n\n", argv[0]);
return 0;
}
return arp_main( argv[1], argv[2], argv[3] );
}
// linux下获取LAN里指定IP的网卡MAC
// In: nic_name: 本地网卡名字, nic_ip:本机IP，des_ip:目的IP
// Out: 1表示获取MAC成功，des_ip已被使用, -1表示发生错误，0表示des_ip未使用
int arp_main( char *nic_name, char *nic_ip, char *des_ip)
{
strcpy(strETH, nic_name); //"eth0";
strcpy(strSrcIP, nic_ip); //"10.0.1.77";
strcpy(strDesIP, des_ip); //"10.0.1.69";
wenxy_debug("Run ......\n");
wenxy_debug("获取 %s 接口的MAC ......\n", strETH);
// 获取指定NIC名称的MAC
/*strLocalMAC = GetLocalMac(strETH);*/
GetLocalMac(strETH);
#if 0
wenxy_debug("Note: %s[%s]\n", strETH, strLocalMAC);
#endif
// 获取指定接口MAC
if ( 0 == strcmp( (const char*)strLocalMAC, (const char*)"") )
{
wenxy_debug("Error: call strcmp() failed\n");
wenxy_debug("--------------------------------\n\n");
return -1;
}
else
{
wenxy_debug("获取接口MAC成功: %s [%s]\n", strETH, strLocalMAC);
}
// 获取指定IP网卡的MAC
/*strDesMAC = GetMacByIP(strSrcIP, strLocalMAC, strDesIP, strETH);*/
GetMacByIP(strSrcIP, strLocalMAC, strDesIP, strETH);
wenxy_debug("strDesMAC = %s\n", strDesMAC);
if(1 == find_ip_flag)
{
printf("Note: strDesIP: %s, strDesMAC: %s\n", strDesIP, strDesMAC);
return 1;
}
else
{
printf("Note: strDesIP: %s does not use\n", strDesIP);
return 0;
}
}
