77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
// Copyright 2004-2018 Nicholas J. Kain <njkain at gmail dot com>
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// SPDX-License-Identifier: MIT
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#ifndef NDHC_DHCP_H_
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#define NDHC_DHCP_H_
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#include <stdint.h>
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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#include "ndhc.h"
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#define DHCP_SERVER_PORT 67
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#define DHCP_CLIENT_PORT 68
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#define DHCP_MAGIC 0x63825363
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enum {
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DHCPDISCOVER = 1,
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DHCPOFFER = 2,
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DHCPREQUEST = 3,
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DHCPDECLINE = 4,
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DHCPACK = 5,
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DHCPNAK = 6,
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DHCPRELEASE = 7,
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DHCPINFORM = 8
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};
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struct dhcpmsg {
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uint8_t op; // Message type: 1 = BOOTREQUEST for clients.
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uint8_t htype; // ARP HW address type: always '1' for ethernet.
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uint8_t hlen; // Hardware address length: always '6' for ethernet.
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uint8_t hops; // Client sets to zero.
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uint32_t xid; // Transaction ID: random number identifying session
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uint16_t secs; // Filled by client: seconds since client began address
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// aquisition or renewal process.
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uint16_t flags; // DHCP flags
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uint32_t ciaddr; // Client IP: only filled in if client is in BOUND, RENEW,
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// or REBINDING and can reply to ARP requests
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uint32_t yiaddr; // 'your' (client) IP address
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uint32_t siaddr; // Always zero -- unused.
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uint32_t giaddr; // Always zero -- unused.
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uint8_t chaddr[16]; // Client MAC address
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uint8_t sname[64]; // More DHCP options (#3)
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uint8_t file[128]; // More DHCP options (#2)
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uint32_t cookie; // Magic number cookie that starts DHCP options
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uint8_t options[308]; // DHCP options field (#1)
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};
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struct ip_udp_dhcp_packet {
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struct iphdr ip;
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struct udphdr udp;
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struct dhcpmsg data;
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};
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struct udp_dhcp_packet {
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struct udphdr udp;
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struct dhcpmsg data;
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};
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void start_dhcp_listen(struct client_state_t *cs);
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void stop_dhcp_listen(struct client_state_t *cs);
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bool dhcp_packet_get(struct client_state_t *cs, struct dhcpmsg *packet,
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uint8_t *msgtype, uint32_t *srcaddr);
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ssize_t send_discover(struct client_state_t *cs);
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ssize_t send_selecting(struct client_state_t *cs);
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ssize_t send_renew_or_rebind(struct client_state_t *cs, bool is_renew);
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static inline ssize_t send_renew(struct client_state_t *cs)
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{
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return send_renew_or_rebind(cs, true);
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}
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static inline ssize_t send_rebind(struct client_state_t *cs)
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{
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return send_renew_or_rebind(cs, false);
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}
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ssize_t send_decline(struct client_state_t *cs, uint32_t server);
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ssize_t send_release(struct client_state_t *cs);
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#endif
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