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ARP编程/代码/test.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <netinet/if_ether.h>
+#include <netinet/in.h>
+#include <net/if_arp.h>
+#include <linux/if_packet.h>
+
+struct arppacket
+{
+    struct arphdr ar_head;/*硬件类型、协议、地址长度、操作码*/
+    unsigned char ar_sha[ETH_ALEN];/*发送方MAC*/
+    struct in_addr ar_sip;/*发送方IP*/
+    unsigned char ar_tha[ETH_ALEN];;/*目的MAC*/
+    struct in_addr ar_tip;/*目的IP*/
+}__attribute__((packed));
+
+int main(int argc, char **argv)
+{
+	//初始化及参数检查
+    struct in_addr pingaddr;
+    struct in_addr netaddr;
+    struct in_addr netmask;
+    struct sockaddr_ll hwaddr;
+    memset(&netaddr, 0, sizeof(netaddr));
+    memset(&netmask, 0, sizeof(netmask));
+    memset(&hwaddr, 0, sizeof(hwaddr));
+
+	//输入错误，显示正确输入格式
+    if(argc != 2)
+    {
+        perror("Usage: ./test xxx.xxx.xxx.xxx\n");
+        exit(-1);
+    }
+
+	//参数错误，输入的不是ip地址
+    if(inet_aton(argv[1], &pingaddr) < 0)
+    {
+        perror("not a correct ip address\n");
+        exit(-1);
+    }
+
+
+    // 注册原始套接字
+    int fd = socket(PF_PACKET, SOCK_RAW, htonl(0x0003));
+
+    // 获得网卡信息
+    char buf[1024];
+    struct ifconf ifc;
+    ifc.ifc_len = sizeof(buf);
+    ifc.ifc_buf = buf;
+    if(ioctl(fd, SIOCGIFCONF, &ifc) == -1)
+    {
+        perror("get net interface error\n");
+        exit(-1);
+    }
+
+
+    // get correct net interface
+    int flag = 0;
+	int i;
+    struct ifreq *ifrPtr;
+    int networkNum = ifc.ifc_len / sizeof(struct ifreq);
+    for(i = 0; i < networkNum; i++)
+    {
+        ifrPtr = ((struct ifreq*)buf) + i;
+        if(ioctl(fd, SIOCGIFADDR, ifrPtr) == -1)
+        {
+            perror("get ip address error\n");
+            exit(-1);
+        }
+        netaddr = ((struct sockaddr_in*)&(ifrPtr->ifr_addr))->sin_addr;
+
+        if(ioctl(fd, SIOCGIFNETMASK, ifrPtr) == -1)
+        {
+            perror("get netmask error\n");
+            exit(-1);
+        }
+        netmask = ((struct sockaddr_in*)&(ifrPtr->ifr_netmask))->sin_addr;
+		// 设置sockaddr_ll地址
+        if((pingaddr.s_addr & netmask.s_addr) == (netaddr.s_addr & netmask.s_addr))
+        {
+            hwaddr.sll_family = PF_PACKET;
+            hwaddr.sll_protocol = htons(ETH_P_ARP);
+            hwaddr.sll_hatype = ARPHRD_ETHER;
+            hwaddr.sll_pkttype = PACKET_OTHERHOST;
+            hwaddr.sll_halen = ETH_ALEN;
+
+            if(ioctl(fd, SIOCGIFINDEX, ifrPtr) == -1)
+            {
+                perror("get net interface index error\n");
+                exit(-1);
+            }
+            hwaddr.sll_ifindex = ifrPtr->ifr_ifindex;
+
+            if(ioctl(fd, SIOCGIFHWADDR, ifrPtr) == -1)
+            {
+                perror("get net interface hwaddr error\n");
+                exit(-1);
+            }
+            memcpy(hwaddr.sll_addr, ifrPtr->ifr_hwaddr.sa_data, ETH_ALEN);
+
+            flag = 1;
+            break;
+        }
+    }
+
+    if(flag != 1)
+    {
+        perror("can not find correct net interface\n");
+        exit(-1);
+    }
+
+
+    // 构建ARP请求包
+    char ef[ETH_FRAME_LEN];
+	//使p_eth指向以太网帧的帧头
+    struct ethhdr *p_eth = (struct ethhdr*)ef;
+	//目的以太网地址
+    memset(p_eth->h_dest, 0xff, ETH_ALEN);
+	//源以太网地址
+    memcpy(p_eth->h_source, hwaddr.sll_addr, ETH_ALEN);
+	//设置协议类型
+    p_eth->h_proto = htons(ETH_P_ARP);
+
+	//定位ARP包地址
+    struct arppacket *p_arp = (struct arppacket*)(ef + ETH_HLEN);
+	//硬件类型
+    p_arp->ar_head.ar_hrd = htons(ARPHRD_ETHER);/*arp硬件类型*/
+    p_arp->ar_head.ar_pro = htons(ETH_P_IP);    /*协议类型*/
+    p_arp->ar_head.ar_hln = ETH_ALEN;           /*硬件地址长度*/
+    p_arp->ar_head.ar_pln = 4;                   /*IP地址长度*/
+    p_arp->ar_head.ar_op = htons(ARPOP_REQUEST);
+
+    /*复制源以太网地址*/
+    memcpy(p_arp->ar_sha, hwaddr.sll_addr, ETH_ALEN);
+	/*源IP地址*/
+    p_arp->ar_sip = netaddr;
+	/*复制目的以太网地址*/
+    memset(p_arp->ar_tha, 0, ETH_ALEN);
+	//目的IP地址
+    p_arp->ar_tip = pingaddr;
+	//绑定网卡
+    if(bind(fd, (struct sockaddr*)&hwaddr, sizeof(struct sockaddr_ll)) == -1)
+    {
+        perror("bind network error\n");
+        exit(-1);
+    }
+	//发送以太网帧
+    write(fd, ef, 60);
+	//读取并打印目的MAC
+    while(1)
+    {
+        read(fd, ef, sizeof(ef));
+        struct arppacket *recv_arp = (struct arppacket*)(ef+ETH_HLEN);
+        if(recv_arp->ar_tip.s_addr == netaddr.s_addr)
+        {
+			printf("Find %s 's mac:",argv[1]);
+			for (i = 0; i < ETH_ALEN - 1; i++)
+				printf("%02x-", recv_arp->ar_sha[i]);
+			printf("%02x\n", recv_arp->ar_sha[ETH_ALEN - 1]);
+
+            break;
+        }
+    }
+	return 0;
+}
+
+