80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
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/*单播ARP应答*/
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <netinet/ether.h>
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#include <netpacket/packet.h>
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#include <sys/ioctl.h>
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#include <net/if.h> // ifreq
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#include <unistd.h>
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#include <string.h> // bzero
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#include <stdio.h>
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// 发送原始数据报
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ssize_t send_datapacket(int fd, unsigned char *buf, ssize_t buf_size, const char *ether_name);
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ssize_t send_datapacket(int fd, unsigned char *buf, ssize_t buf_size, const char *ether_name)
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{
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// 1. 获取网络接口类型(通过网卡名查找网卡索引)
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struct ifreq ether_req;
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bzero(ðer_req, sizeof(ether_req));
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strncpy(ether_req.ifr_name, ether_name, IF_NAMESIZE); // # define ifr_name ifr_ifrn.ifrn_name
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if (ioctl(fd, SIOCGIFINDEX, ðer_req) == -1)
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{
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perror("ioctl");
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return -1;
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}
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// 2. 选择发送数据的网络接口索引(选择合适的网卡索引)
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struct sockaddr_ll sll;
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bzero(&sll, sizeof(sll));
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sll.sll_ifindex = ether_req.ifr_ifindex; // # define ifr_ifindex ifr_ifru.ifru_ivalue
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// 3. 发送数据
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ssize_t len = sendto(fd, buf, buf_size, 0, (struct sockaddr *)&sll, sizeof(sll));
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return len;
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}
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int main(int argc, char const *argv[])
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{
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// 创建原始套接字
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int sock_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
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if (sock_fd < 0)
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{
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perror("raw socket");
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return -1;
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}
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// 组ARP应答报文(如果是ARP欺骗，则源MAC为0x00,0x00,0x00,0x00,0x00,0x00)
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uint32_t src_ip = inet_addr("10.12.156.204"); // 发送的 ip 地址
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uint32_t dst_ip = inet_addr("10.12.156.178"); // 点分十进制转换为数字字符串
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unsigned char *src_ip_p = (unsigned char *)&src_ip; // src_ip 的字符类型指针
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unsigned char *dst_ip_p = (unsigned char *)&dst_ip;
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unsigned char buf[] = {
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0x00, 0x0c, 0x29, 0xf7, 0x81, 0x4c, /*目的MAC地址*/
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0x00, 0x0c, 0x29, 0x85, 0xcc, 0x67, /* 源MAC地址 */
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0x08, 0x06, /* ARP帧类型 */
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0x00, 0x01, /* 硬件类型 */
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0x08, 0x00, /* 协议类型(IP协议0x0800) */
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0x06, 0x04, /* 硬件地址长度(MAC地址长度) 和 协议地址长度(IP 地址长度) */
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0x00, 0x02, /* OP操作类型(ARP应答 = 2) */
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0x00, 0x0c, 0x29, 0x85, 0xcc, 0x67, /* 发送端MAC地址 */
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src_ip_p[0], src_ip_p[1], src_ip_p[2], src_ip_p[3], /* 源(发送端) IP 地址 */
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0x00, 0x0c, 0x29, 0xf7, 0x81, 0x4c, /*接收端MAC地址*/
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dst_ip_p[0], dst_ip_p[1], dst_ip_p[2], dst_ip_p[3] /* 接收端 IP 地址 */
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};
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// 单播发送ARP应答
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ssize_t len = send_datapacket(sock_fd, buf, sizeof(buf), "ens38");
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if (len > 0)
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{
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printf("send arp success! \n");
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}
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close(sock_fd);
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return 0;
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}
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