67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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/*拆解到IP报文*/
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#include <netinet/ether.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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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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printf("原始套接字创建成功\n");
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// 多次接收数据
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while (1)
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{
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// 接链路层的数据报文(MAC报文)
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unsigned char buf[1518] = ""; // 记得使用无符号类型
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int len = recvfrom(sock_fd, buf, sizeof(buf), 0, NULL, NULL);
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if (len < 18)
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{
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perror("recvfrom");
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continue;
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}
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// 拆解 MAC 数据报文
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unsigned char dst_mac[18] = ""; // 目的MAC地址
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unsigned char src_mac[18] = ""; // 源MAC地址
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unsigned short mac_type = ntohs(*((unsigned short *)(buf + 12)));
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// sprintf(src_mac, "%02x:%02x:%02x:%02x:%02x:%02x", buf[6], buf[7], buf[8], buf[9], buf[10], buf[11]);
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// sprintf(dst_mac, "%02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
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sprintf(src_mac, "%02x:%02x:%02x:%02x:%02x:%02x", buf[6], buf[7], buf[8], buf[9], buf[10], buf[11]);
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sprintf(dst_mac, "%02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
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// if (strncmp(src_mac, "00:00:00", 8) != 0)
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printf("dst_mac %s -> src_mac %s type(%#x)\n", dst_mac, src_mac, mac_type);
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sleep(1);
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switch (mac_type)
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{
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case 0x0800:
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printf("-----ip 数据包-----\n");
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break;
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case 0x0806:
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printf("-----ARP 数据包-----\n");
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break;
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case 0x8035:
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printf("-----RARP 数据包-----\n");
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break;
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}
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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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