120 lines
4.2 KiB
C
120 lines
4.2 KiB
C
/**
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* @file DHCPIpUdpEncoder.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <limits.h>
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#include <string.h>
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#include <stddef.h>
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#include <misc/ipv4_proto.h>
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#include <misc/udp_proto.h>
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#include <misc/byteorder.h>
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#include <dhcpclient/DHCPIpUdpEncoder.h>
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#define DHCP_SERVER_PORT 67
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#define DHCP_CLIENT_PORT 68
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#define IPUDP_HEADER_SIZE (sizeof(struct ipv4_header) + sizeof(struct udp_header))
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static void output_handler_recv (DHCPIpUdpEncoder *o, uint8_t *data)
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{
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DebugObject_Access(&o->d_obj);
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// remember output packet
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o->data = data;
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// receive payload
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PacketRecvInterface_Receiver_Recv(o->input, o->data + IPUDP_HEADER_SIZE);
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}
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static void input_handler_done (DHCPIpUdpEncoder *o, int data_len)
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{
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DebugObject_Access(&o->d_obj);
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// build IP header
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struct ipv4_header iph;
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iph.version4_ihl4 = IPV4_MAKE_VERSION_IHL(sizeof(iph));
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iph.ds = hton8(0);
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iph.total_length = hton16(IPUDP_HEADER_SIZE + data_len);
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iph.identification = hton16(0);
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iph.flags3_fragmentoffset13 = hton16(0);
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iph.ttl = hton8(64);
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iph.protocol = hton8(IPV4_PROTOCOL_UDP);
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iph.checksum = hton16(0);
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iph.source_address = hton32(0x00000000);
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iph.destination_address = hton32(0xFFFFFFFF);
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iph.checksum = ipv4_checksum(&iph, NULL, 0);
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// write UDP header
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struct udp_header udph;
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udph.source_port = hton16(DHCP_CLIENT_PORT);
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udph.dest_port = hton16(DHCP_SERVER_PORT);
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udph.length = hton16(sizeof(udph) + data_len);
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udph.checksum = hton16(0);
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udph.checksum = udp_checksum(&udph, o->data + IPUDP_HEADER_SIZE, data_len, iph.source_address, iph.destination_address);
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// write header
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memcpy(o->data, &iph, sizeof(iph));
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memcpy(o->data + sizeof(iph), &udph, sizeof(udph));
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// finish packet
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PacketRecvInterface_Done(&o->output, IPUDP_HEADER_SIZE + data_len);
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}
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void DHCPIpUdpEncoder_Init (DHCPIpUdpEncoder *o, PacketRecvInterface *input, BPendingGroup *pg)
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{
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ASSERT(PacketRecvInterface_GetMTU(input) <= INT_MAX - IPUDP_HEADER_SIZE)
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// init arguments
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o->input = input;
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// init input
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PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
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// init output
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PacketRecvInterface_Init(&o->output, IPUDP_HEADER_SIZE + PacketRecvInterface_GetMTU(o->input), (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
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DebugObject_Init(&o->d_obj);
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}
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void DHCPIpUdpEncoder_Free (DHCPIpUdpEncoder *o)
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{
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DebugObject_Free(&o->d_obj);
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// free output
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PacketRecvInterface_Free(&o->output);
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}
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PacketRecvInterface * DHCPIpUdpEncoder_GetOutput (DHCPIpUdpEncoder *o)
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{
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DebugObject_Access(&o->d_obj);
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return &o->output;
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}
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