void ip_rcv(void)
{
uint16_t len = pkt_left;
SNMP(ip_in_receives);
if (!pkt_pull(&iph, sizeof(struct iphdr)))
return;
plen = ntohs(iph.tot_len);
/* FIXME: for speed fold ihl/version and be smarter */
if (iph.ihl < 5 || iph.version != 4 || len < plen) {
SNMP(ip_in_hdr_errors);
return;
}
plen -= sizeof(struct iphdr));
if (pkt_len > plen)
pkt_len = plen;
/* FIXME: checksum */
if (iph.ihl != 5)
if (ip_options())
return;
/* No frags for now (memory limits on 8bit) */
if (iph.frag_off)
return;
if (iph.daddr == 0xFFFFFFFF)
pkt_type = PKT_BROADCAST;
else if (MULTICAST(iph.daddr))
pkt_type = PKT_MULTICAST;
else if (iph.daddr == ip_addr || LOOPBACK(iph.daddr))
pkt_type = PKT_HOST;
else
/* No forwarding so we don't have to worry about martians either */
return;
/* FIXME: raw sockets ?? */
if (iph.protocol == IPPROTO_TCP)
tcp_rcv();
else if (iph.protocol == IPPROTO_UDP)
udp_rcv();
else if (iph.protocol == IPPROTO_ICMP)
icmp_rcv();
else
icmp_send_unreach(ICMP_DEST_UNREACH, ICMP_PROT_UNREACH);
}
static void runIRC(FILE *uart) {
char mynick[10] = "ISMO";
char mychannel[20] = "SOP";
int userchoice = 0;
DDRB= 0x0f;
PORTB=0x0f;
PORTB = 13;
lcdPrint("SNMP Chat");
do {
fflush(uart);
puts("\n\n\n\n\n");
puts("\n*************");
puts("\n* SNMP Chat *");
puts("\n*************\n");
printf("\n1. Nickname: %s\n", mynick);
printf("\n2. Channel: %s\n", mychannel);
puts("\n3. Start chatting\n");
puts("\n4. Return to Main Menu\n");
puts("\nEnter your choice: ");
readLine(inbuf, sizeof(inbuf));
if (inbuf[0]) {
puts("\n\n");
userchoice = atoi(inbuf);
switch (userchoice)
{
case 1: puts("\nEnter your nickname: ");
readLine(mynick, sizeof(mynick));
break;
case 2: puts("\nEnter server address: ");
readLine(mychannel, sizeof(mychannel));
break;
case 3: puts("\nStart Chatting!\n");
SNMP(mynick, mychannel, myip, mysubnetmask);
break;
case 4: puts("\nReturning to Main Menu\n");
puts("\n\n\n\n\n");
break;
default: puts("\nInvalid option selected\n");
}
}
}
while (userchoice != 4);
}
