static void dhcp_send_request_packet(struct bootp *bp_offer)
{
struct bootp *bp;
int extlen;
IPaddr_t OfferedIP;
unsigned char *payload = net_udp_get_payload(dhcp_con);
debug("%s: Sending DHCPREQUEST\n", __func__);
bp = (struct bootp *)payload;
bp->bp_op = OP_BOOTREQUEST;
bp->bp_htype = HWT_ETHER;
bp->bp_hlen = HWL_ETHER;
bp->bp_hops = 0;
/* FIXME what is this? */
// bp->bp_secs = htons(get_timer(0) / CFG_HZ);
net_copy_ip(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
net_copy_ip(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
net_copy_ip(&bp->bp_siaddr, &bp_offer->bp_siaddr);
/*
* RFC3046 requires Relay Agents to discard packets with
* nonzero and offered giaddr
*/
net_write_ip(&bp->bp_giaddr, 0);
memcpy(bp->bp_chaddr, dhcp_con->et->et_src, 6);
/*
* ID is the id of the OFFER packet
*/
net_copy_uint32(&bp->bp_id, &bp_offer->bp_id);
/*
* Copy options from OFFER packet if present
*/
net_copy_ip(&OfferedIP, &bp->bp_yiaddr);
extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, net_dhcp_server_ip,
OfferedIP);
debug("Transmitting DHCPREQUEST packet\n");
net_udp_send(dhcp_con, sizeof(*bp) + extlen);
}
static int bootp_request(void)
{
struct bootp *bp;
int ext_len;
int ret;
unsigned char *payload = net_udp_get_payload(dhcp_con);
const char *bfile;
dhcp_state = INIT;
debug("BOOTP broadcast\n");
bp = (struct bootp *)payload;
bp->bp_op = OP_BOOTREQUEST;
bp->bp_htype = HWT_ETHER;
bp->bp_hlen = HWL_ETHER;
bp->bp_hops = 0;
bp->bp_secs = htons(get_time_ns() >> 30);
net_write_ip(&bp->bp_ciaddr, 0);
net_write_ip(&bp->bp_yiaddr, 0);
net_write_ip(&bp->bp_siaddr, 0);
net_write_ip(&bp->bp_giaddr, 0);
memcpy(bp->bp_chaddr, dhcp_con->et->et_src, 6);
bfile = getenv("bootfile");
if (bfile)
safe_strncpy (bp->bp_file, bfile, sizeof(bp->bp_file));
/* Request additional information from the BOOTP/DHCP server */
ext_len = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
Bootp_id = (uint32_t)get_time_ns();
net_copy_uint32(&bp->bp_id, &Bootp_id);
dhcp_state = SELECTING;
ret = net_udp_send(dhcp_con, sizeof(*bp) + ext_len);
return ret;
}
static void copy_uint32_handle(struct dhcp_opt *opt, unsigned char *popt, int optlen)
{
net_copy_uint32(opt->data, (uint32_t *)popt);
};
static void dhcp_options_process(unsigned char *popt, struct bootp *bp)
{
unsigned char *end = popt + sizeof(*bp) + OPT_SIZE;
int oplen;
IPaddr_t ip;
char str[256];
while (popt < end && *popt != 0xff) {
oplen = *(popt + 1);
switch (*popt) {
case 1:
ip = net_read_ip(popt + 2);
net_set_netmask(ip);
break;
case 3:
ip = net_read_ip(popt + 2);
net_set_gateway(ip);
break;
case 6:
ip = net_read_ip(popt + 2);
setenv_ip("nameserver", ip);
break;
case 12:
memcpy(str, popt + 2, oplen);
str[oplen] = 0;
setenv("hostname", str);
break;
case 15:
memcpy(str, popt + 2, oplen);
str[oplen] = 0;
setenv("domainname", str);
break;
case 17:
memcpy(str, popt + 2, oplen);
str[oplen] = 0;
setenv("rootpath", str);
break;
case 51:
net_copy_uint32 (&dhcp_leasetime, (uint32_t *)(popt + 2));
break;
case 53: /* Ignore Message Type Option */
break;
case 54:
net_copy_ip(&net_dhcp_server_ip, (popt + 2));
break;
case 58: /* Ignore Renewal Time Option */
break;
case 59: /* Ignore Rebinding Time Option */
break;
case 66: /* Ignore TFTP server name */
break;
case 67: /* vendor opt bootfile */
/*
* I can't use dhcp_vendorex_proc here because I need
* to write into the bootp packet - even then I had to
* pass the bootp packet pointer into here as the
* second arg
*/
memcpy(str, popt + 2, oplen);
str[oplen] = 0;
if (bp->bp_file[0] == '\0') {
/*
* only use vendor boot file if we didn't
* receive a boot file in the main non-vendor
* part of the packet - god only knows why
* some vendors chose not to use this perfectly
* good spot to store the boot file (join on
* Tru64 Unix) it seems mind bogglingly crazy
* to me
*/
printf("*** WARNING: using vendor "
"optional boot file\n");
setenv("bootfile", str);
}
break;
default:
#ifdef CONFIG_BOOTP_VENDOREX
if (dhcp_vendorex_proc (popt))
break;
#endif
debug("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
break;
}
popt += oplen + 2; /* Process next option */
}
}
