299d578f7f
1. DHCP server trasmit 2. Client parses and saves in leases Implements http://www.rfc-editor.org/rfc/rfc3361.txt ``` Frame 134: 348 bytes on wire (2784 bits), 348 bytes captured (2784 bits) on interface 0 Ethernet II, Src: 42:65:85:d6:4e:32 (42:65:85:d6:4e:32), Dst: 1e:04:f8:b8:2f:d4 (1e:04:f8:b8:2f:d4) Internet Protocol Version 4, Src: 192.168.5.1, Dst: 192.168.5.11 User Datagram Protocol, Src Port: 67, Dst Port: 68 Dynamic Host Configuration Protocol (ACK) Message type: Boot Reply (2) Hardware type: Ethernet (0x01) Hardware address length: 6 Hops: 0 Transaction ID: 0x7cc87cb4 Seconds elapsed: 0 Bootp flags: 0x0000 (Unicast) Client IP address: 0.0.0.0 Your (client) IP address: 192.168.5.11 Next server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0 Client MAC address: 1e:04:f8:b8:2f:d4 (1e:04:f8:b8:2f:d4) Client hardware address padding: 00000000000000000000 Server host name not given Boot file name not given Magic cookie: DHCP Option: (53) DHCP Message Type (ACK) Length: 1 DHCP: ACK (5) Option: (51) IP Address Lease Time Length: 4 IP Address Lease Time: (3600s) 1 hour Option: (1) Subnet Mask (255.255.255.0) Length: 4 Subnet Mask: 255.255.255.0 Option: (3) Router Length: 4 Router: 192.168.5.1 Option: (6) Domain Name Server Length: 4 Domain Name Server: 192.168.5.1 Option: (42) Network Time Protocol Servers Length: 4 Network Time Protocol Server: 192.168.1.1 Option: (120) SIP Servers <=====here Length: 9 SIP Server Encoding: IPv4 Address (1) SIP Server Address: 192.168.1.1 SIP Server Address: 192.168.5.2 Option: (101) TCode Length: 13 TZ TCode: Europe/Berlin Option: (54) DHCP Server Identifier (192.168.5.1) Length: 4 DHCP Server Identifier: 192.168.5.1 Option: (255) End Option End: 255 ``` ``` cat /run/systemd/netif/state ✔ ⚡ 3148 16:40:51 OPER_STATE=routable CARRIER_STATE=carrier ADDRESS_STATE=routable DNS=192.168.94.2 192.168.5.1 NTP=192.168.5.1 SIP=192.168.1.1 192.168.5.2 ``` aa
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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Copyright © 2013 Intel Corporation. All rights reserved.
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***/
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#include "sd-dhcp-server.h"
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#include "sd-event.h"
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#include "dhcp-internal.h"
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#include "hashmap.h"
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#include "log.h"
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#include "time-util.h"
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typedef struct DHCPClientId {
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size_t length;
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void *data;
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} DHCPClientId;
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typedef struct DHCPLease {
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DHCPClientId client_id;
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be32_t address;
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be32_t gateway;
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uint8_t chaddr[16];
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usec_t expiration;
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} DHCPLease;
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struct sd_dhcp_server {
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unsigned n_ref;
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sd_event *event;
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int event_priority;
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sd_event_source *receive_message;
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int fd;
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int fd_raw;
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int ifindex;
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be32_t address;
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be32_t netmask;
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be32_t subnet;
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uint32_t pool_offset;
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uint32_t pool_size;
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char *timezone;
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struct in_addr *ntp, *dns, *sip;
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unsigned n_ntp, n_dns, n_sip;
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bool emit_router;
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Hashmap *leases_by_client_id;
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DHCPLease **bound_leases;
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DHCPLease invalid_lease;
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uint32_t max_lease_time, default_lease_time;
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};
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typedef struct DHCPRequest {
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/* received message */
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DHCPMessage *message;
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/* options */
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DHCPClientId client_id;
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size_t max_optlen;
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be32_t server_id;
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be32_t requested_ip;
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uint32_t lifetime;
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} DHCPRequest;
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#define log_dhcp_server(client, fmt, ...) log_internal(LOG_DEBUG, 0, PROJECT_FILE, __LINE__, __func__, "DHCP SERVER: " fmt, ##__VA_ARGS__)
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#define log_dhcp_server_errno(client, error, fmt, ...) log_internal(LOG_DEBUG, error, PROJECT_FILE, __LINE__, __func__, "DHCP SERVER: " fmt, ##__VA_ARGS__)
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int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message,
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size_t length);
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int dhcp_server_send_packet(sd_dhcp_server *server,
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DHCPRequest *req, DHCPPacket *packet,
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int type, size_t optoffset);
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void client_id_hash_func(const DHCPClientId *p, struct siphash *state);
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int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b);
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