コード例 #1
0
ファイル: icmp.c プロジェクト: forest1040/kozos
static int icmp_recv(struct netbuf *pkt)
{
  struct icmp_header *icmphdr;

  icmphdr = (struct icmp_header *)pkt->top;

  /* 正式にはコンソールドライバタスクに依頼する必要があるが,とりあえず */
  puts("ICMP received: ");
  putxval(pkt->option.common.ipaddr.addr, 8); puts(" ");
  putxval(icmphdr->type, 2); puts(" ");
  putxval(icmphdr->code, 2); puts(" ");
  putxval(ntoh2(icmphdr->checksum), 4); puts("\n");

  switch (icmphdr->type) {
  case ICMP_TYPE_REPLY:
    break;
  case ICMP_TYPE_REQUEST:
    icmp_sendpkt(pkt->option.common.ipaddr.addr,
		 ICMP_TYPE_REPLY, icmphdr->code,
		 ntoh2(icmphdr->param.id),
		 ntoh2(icmphdr->param.sequence_number),
		 pkt->size - sizeof(struct icmp_header),
		 (char *)icmphdr + sizeof(*icmphdr));
    break;
  }

  return 0;
}
コード例 #2
0
ファイル: arp.c プロジェクト: forest1040/kozos
static int arp_recv(struct netbuf *pkt)
{
  struct addrset *addr;
  struct arp_header *arphdr;
  uint32 ipaddr;
  uint32 ipaddr_n;

  arphdr = (struct arp_header *)pkt->top;

  if (ntoh2(arphdr->hardware) != ARP_HARDWARE_ETHER)
    return 0;
  if (ntoh2(arphdr->protocol) != ETHERNET_TYPE_IP)
    return 0;

  switch (ntoh2(arphdr->operation)) {
  case ARP_OPERATION_REPLY:
  case ARP_OPERATION_REQUEST:
    memcpy(&ipaddr_n, arphdr->sender_ipaddr, IPADDR_SIZE);
    ipaddr = ntoh4(ipaddr_n);
    addr = arp_setaddr(ipaddr, arphdr->sender_macaddr);
    arp_flush(-1);
    if (ntoh2(arphdr->operation) == ARP_OPERATION_REPLY)
      break;

    ipaddr_n = hton4(my_ipaddr);
    if (memcmp(arphdr->target_ipaddr, &ipaddr_n, IPADDR_SIZE))
      break;

    /* ARP reply を返送 */
    arp_sendpkt(ARP_OPERATION_REPLY, addr->macaddr, addr->ipaddr);
    break;

  default:
    break;
  }

  return 0;
}
コード例 #3
0
ファイル: inet.c プロジェクト: bbusse/netris
static MyEventType NetGenFunc(EventGenRec *gen, MyEvent *event)
{
	int result;
	short type, size;
	netint2 data[2];

	result = MyRead(sock, netBuf + netBufSize, netBufGoal - netBufSize);
	if (result < 0) {
		lostConn = 1;
		return E_lostConn;
	}
	netBufSize += result;
	if (netBufSize < netBufGoal)
		return E_none;
	memcpy(data, netBuf, sizeof(data));
	type = ntoh2(data[0]);
	size = ntoh2(data[1]);
	if (size >= sizeof(netBuf))
		fatal("Received an invalid packet (too large), possibly an attempt\n"
			  "  to exploit a vulnerability in versions before 0.52 !");
	netBufGoal = size;
	if (netBufSize < netBufGoal)
		return E_none;
	netBufSize = 0;
	netBufGoal = HEADER_SIZE;
	event->u.net.type = type;
	event->u.net.size = size - HEADER_SIZE;
	event->u.net.data = netBuf + HEADER_SIZE;
	if (type == NP_endConn) {
		gotEndConn = 1;
		return E_lostConn;
	}
	else if (type == NP_byeBye) {
		lostConn = 1;
		return E_lostConn;
	}
	return E_net;
}