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/*
* dhcp4_packet.c: dhcp packet format functions
*
* Copyright (c) 2013 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dhcp/dhcp4_packet.h>
#include <vnet/ip/format.h>
u8 *
format_dhcp_packet_type (u8 * s, va_list * args)
{
dhcp_packet_type_t pt = va_arg (*args, dhcp_packet_type_t);
switch (pt)
{
case DHCP_PACKET_DISCOVER:
s = format (s, "discover");
break;
case DHCP_PACKET_OFFER:
s = format (s, "offer");
break;
case DHCP_PACKET_REQUEST:
s = format (s, "request");
break;
case DHCP_PACKET_ACK:
s = format (s, "ack");
break;
case DHCP_PACKET_NAK:
s = format (s, "nack");
break;
}
return (s);
}
u8 *
format_dhcp_header (u8 * s, va_list * args)
{
dhcp_header_t *d = va_arg (*args, dhcp_header_t *);
u32 max_bytes = va_arg (*args, u32);
dhcp_option_t *o;
u32 tmp;
s = format (s, "opcode:%s", (d->opcode == 1 ? "request" : "reply"));
s = format (s, " hw[type:%d addr-len:%d addr:%U]",
d->hardware_type, d->hardware_address_length,
format_hex_bytes, d->client_hardware_address,
d->hardware_address_length);
s = format (s, " hops%d", d->hops);
s = format (s, " transaction-ID:0x%x", d->transaction_identifier);
s = format (s, " seconds:%d", d->seconds);
s = format (s, " flags:0x%x", d->flags);
s = format (s, " client:%U", format_ip4_address, &d->client_ip_address);
s = format (s, " your:%U", format_ip4_address, &d->your_ip_address);
s = format (s, " server:%U", format_ip4_address, &d->server_ip_address);
s = format (s, " gateway:%U", format_ip4_address, &d->gateway_ip_address);
s = format (s, " cookie:%U", format_ip4_address, &d->magic_cookie);
o = (dhcp_option_t *) d->options;
while (o->option != 0xFF /* end of options */ &&
(u8 *) o < (u8 *) d + max_bytes)
{
switch (o->option)
{
case 53: /* dhcp message type */
tmp = o->data[0];
s =
format (s, ", option-53: type:%U", format_dhcp_packet_type, tmp);
break;
case 54: /* dhcp server address */
s = format (s, ", option-54: server:%U",
format_ip4_address, &o->data_as_u32[0]);
break;
case 58: /* lease renew time in seconds */
s = format (s, ", option-58: renewal:%d",
clib_host_to_net_u32 (o->data_as_u32[0]));
break;
case 1: /* subnet mask */
s = format (s, ", option-1: subnet-mask:%d",
clib_host_to_net_u32 (o->data_as_u32[0]));
break;
case 3: /* router address */
s = format (s, ", option-3: router:%U",
format_ip4_address, &o->data_as_u32[0]);
break;
case 6: /* domain server address */
s = format (s, ", option-6: domian-server:%U",
format_hex_bytes, o->data, o->length);
break;
case 12: /* hostname */
s = format (s, ", option-12: hostname:%U",
format_hex_bytes, o->data, o->length);
break;
default:
tmp = o->option;
s = format (s, " option-%d: skipped", tmp);
break;
}
o = (dhcp_option_t *) (((u8 *) o) + (o->length + 2));
}
return (s);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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