int
__udp_sendto(char *data, int len, struct sockaddr_in *server,
struct sockaddr_in *local)
{
ip_route_t rt;
if (__arp_lookup((ip_addr_t *)&server->sin_addr, &rt) < 0) {
diag_printf("%s: Can't find address of server\n", __FUNCTION__);
return -1;
} else {
__udp_send(data, len, &rt, ntohs(server->sin_port), ntohs(local->sin_port));
return 0;
}
}
// send BOOTP REQUEST or DHCP DISCOVER
static void
bootp_start(void)
{
int txSize;
bootp_header_t b;
// send out a BOOTP request or DHCP DISCOVER
prep_bootp_request(&b); // basic BOOTP request
#ifdef CYGSEM_REDBOOT_NETWORKING_DHCP
debug_printf("DHCP send: DISCOVER\n");
NewDhcpState(DHCP_WAITING_FOR_OFFER);
txSize = prep_dhcp_discover(&b); // make it into DHCP DISCOVER
#else
debug_printf("BOOTP send: REQUEST\n");
txSize = sizeof(b);
#endif
__udp_send((char *)&b, txSize, (ip_route_t*)&broadcast, IPPORT_BOOTPS, IPPORT_BOOTPC);
}
// Handler for received BOOTP/DHCP packets
static void
bootp_handler(udp_socket_t *skt, char *buf, int len, ip_route_t *src_route,
word src_port)
{
bootp_header_t *b;
#ifdef CYGSEM_REDBOOT_NETWORKING_DHCP
int txSize;
int type;
bootp_header_t txpkt;
unsigned expected = 0;
#endif
b = (bootp_header_t *) buf;
// only accept BOOTP REPLY responses
if (b->bp_op != BOOTREPLY)
return;
// must be sent to me
if (memcmp(b->bp_chaddr, __local_enet_addr, b->bp_hlen))
return;
// verify XID
if (b->bp_xid != xid)
return;
#if !defined(CYGSEM_REDBOOT_NETWORKING_DHCP)
// simple BOOTP - this is all there is!
debug_printf("BOOTP recv: REPLY\n");
if (dhcpState != DHCP_DONE) {
save_packet(b, len);
parseConfig(b, len);
NewDhcpState(DHCP_DONE);
}
#else
// DHCP support is enabled...
// Check to see that it's a DHCP packet with a DHCP type field
type = -1;
if (!memcmp(b->bp_vend, dhcpCookie, sizeof dhcpCookie)) {
unsigned char *p = b->bp_vend + 4;
while (p < (unsigned char *)b + len) {
if (*p == TAG_DHCP_MESS_TYPE) {
type = p[2];
break;
}
p += p[1] + 2;
}
}
if (type == -1) {
// apparently we have a BOOTP (but not not DHCP) server
debug_printf("DHCP recv: BOOTP-REPLY -- falling back to BOOTP mode\n");
if (dhcpState != DHCP_DONE) {
save_packet(b, len);
parseConfig(b, len);
NewDhcpState(DHCP_DONE);
}
return;
}
// it's a real DHCP packet
debug_printf("DHCP recv: %s [%d]\n", dhcpTypeString[type], type);
switch (dhcpState) {
case DHCP_WAITING_FOR_OFFER:
if (type == (expected = DHCP_MESS_TYPE_OFFER)) {
prep_bootp_request(&txpkt);
txSize = prep_dhcp_request(&txpkt, b);
debug_printf("DHCP send: REQUEST\n");
NewDhcpState(DHCP_WAITING_FOR_ACK);
__udp_send((char *)&txpkt, txSize, (ip_route_t *)&broadcast, IPPORT_BOOTPS, IPPORT_BOOTPC);
return;
}
break;
case DHCP_WAITING_FOR_ACK:
if (type == (expected = DHCP_MESS_TYPE_ACK)) {
save_packet(b, len);
parseConfig(b, len);
NewDhcpState(DHCP_DONE);
return;
}
break;
default:
debug_printf("DHCP packet ignored\n");
return;
}
if (type == DHCP_MESS_TYPE_NAK && dhcpState != DHCP_DONE) {
NewDhcpState(DHCP_FAILED);
return;
}
debug_printf("DHCP packet ignored -- expected %d[%s]\n", expected, dhcpTypeString[expected]);
#endif
}