arp協(xié)議的c語言實現(xiàn)源代碼(編輯修改稿)
2025-06-26 18:04 本頁面
【文章內(nèi)容簡介】 \n, device)。 exit(2)。}he = me。memset(, 1, )。 // set dmac addr FF:FF:FF:FF:FF:FFreturn s。}int create_pkt(unsigned char * buf, struct in_addr src, struct in_addr dst, struct sockaddr_ll * FROM, struct sockaddr_ll * TO){struct arphdr *ah = (struct arphdr*) buf。unsigned char *p = (unsigned char *)(ah+1)。ahar_hrd = htons(FROMsll_hatype)。if (ahar_hrd == htons(ARPHRD_FDDI)) ahar_hrd = htons(ARPHRD_ETHER)。ahar_pro = htons(ETH_P_IP)。ahar_hln = FROMsll_halen。ahar_pln = 4。ahar_op = htons(ARPOP_REQUEST)。memcpy(p, amp。FROMsll_addr, ahar_hln)。p+=FROMsll_halen。memcpy(p, amp。src, 4)。p+=4。memcpy(p, amp。TOsll_addr, ahar_hln)。p+=ahar_hln。memcpy(p, amp。dst, 4)。p+=4。 memcpy(p, fill_buf, strlen(fill_buf) )。p+=12。return (pbuf)。}void send_pkt(){ unsigned char send_buf[256]。 int pkt_size = create_pkt(send_buf, src, dst, amp。me, amp。he)。gettimeofday(amp。send_time, NULL)。 int cc = sendto(socket_id, send_buf, pkt_size, 0, (struct sockaddr*)amp。he, sizeof(he))。if( cc == pkt_size ) send_count++。 alarm(1)。}int chk_recv_pkt(unsigned char * buf, struct sockaddr_ll * FROM){struct arphdr *ah = (struct ar
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