/*      $OpenBSD: dhcpleased.h,v 1.18 2025/09/18 11:37:01 florian Exp $ */

/*
 * Copyright (c) 2017, 2021 Florian Obser <florian@openbsd.org>
 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define _PATH_LOCKFILE          "/dev/dhcpleased.lock"
#define _PATH_CONF_FILE         "/etc/dhcpleased.conf"
#define _PATH_DHCPLEASED_SOCKET "/dev/dhcpleased.sock"
#define DHCPLEASED_USER         "_dhcp"
#define DHCPLEASED_RTA_LABEL    "dhcpleased"
#define SERVER_PORT             67
#define CLIENT_PORT             68
#define _PATH_LEASE             "/var/db/dhcpleased/"
#define LEASE_VERSION           "version: 2"
#define LEASE_IP_PREFIX         "ip: "
#define LEASE_NEXTSERVER_PREFIX "next-server: "
#define LEASE_BOOTFILE_PREFIX   "filename: "
#define LEASE_HOSTNAME_PREFIX   "host-name: "
#define LEASE_DOMAIN_PREFIX     "domain-name: "
#define LEASE_SIZE              4096
/* MAXDNAME from arpa/namesr.h */
#define DHCPLEASED_MAX_DNSSL    1025
#define MAX_RDNS_COUNT          8 /* max nameserver in a RTM_PROPOSAL */

/* A 1500 bytes packet can hold less than 300 classless static routes */
#define MAX_DHCP_ROUTES         256

#define DHCP_COOKIE             {99, 130, 83, 99}

/* Possible values for hardware type (htype) field. */
#define HTYPE_NONE              0
#define HTYPE_ETHER             1
#define HTYPE_IPSEC_TUNNEL      31

/* DHCP op code */
#define DHCP_BOOTREQUEST                1
#define DHCP_BOOTREPLY                  2

/* DHCP Option codes: */
#define DHO_PAD                         0
#define DHO_SUBNET_MASK                 1
#define DHO_TIME_OFFSET                 2
#define DHO_ROUTERS                     3
#define DHO_TIME_SERVERS                4
#define DHO_NAME_SERVERS                5
#define DHO_DOMAIN_NAME_SERVERS         6
#define DHO_LOG_SERVERS                 7
#define DHO_COOKIE_SERVERS              8
#define DHO_LPR_SERVERS                 9
#define DHO_IMPRESS_SERVERS             10
#define DHO_RESOURCE_LOCATION_SERVERS   11
#define DHO_HOST_NAME                   12
#define DHO_BOOT_SIZE                   13
#define DHO_MERIT_DUMP                  14
#define DHO_DOMAIN_NAME                 15
#define DHO_SWAP_SERVER                 16
#define DHO_ROOT_PATH                   17
#define DHO_EXTENSIONS_PATH             18
#define DHO_IP_FORWARDING               19
#define DHO_NON_LOCAL_SOURCE_ROUTING    20
#define DHO_POLICY_FILTER               21
#define DHO_MAX_DGRAM_REASSEMBLY        22
#define DHO_DEFAULT_IP_TTL              23
#define DHO_PATH_MTU_AGING_TIMEOUT      24
#define DHO_PATH_MTU_PLATEAU_TABLE      25
#define DHO_INTERFACE_MTU               26
#define DHO_ALL_SUBNETS_LOCAL           27
#define DHO_BROADCAST_ADDRESS           28
#define DHO_PERFORM_MASK_DISCOVERY      29
#define DHO_MASK_SUPPLIER               30
#define DHO_ROUTER_DISCOVERY            31
#define DHO_ROUTER_SOLICITATION_ADDRESS 32
#define DHO_STATIC_ROUTES               33
#define DHO_TRAILER_ENCAPSULATION       34
#define DHO_ARP_CACHE_TIMEOUT           35
#define DHO_IEEE802_3_ENCAPSULATION     36
#define DHO_DEFAULT_TCP_TTL             37
#define DHO_TCP_KEEPALIVE_INTERVAL      38
#define DHO_TCP_KEEPALIVE_GARBAGE       39
#define DHO_NIS_DOMAIN                  40
#define DHO_NIS_SERVERS                 41
#define DHO_NTP_SERVERS                 42
#define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
#define DHO_NETBIOS_NAME_SERVERS        44
#define DHO_NETBIOS_DD_SERVER           45
#define DHO_NETBIOS_NODE_TYPE           46
#define DHO_NETBIOS_SCOPE               47
#define DHO_FONT_SERVERS                48
#define DHO_X_DISPLAY_MANAGER           49
#define DHO_DHCP_REQUESTED_ADDRESS      50
#define DHO_DHCP_LEASE_TIME             51
#define DHO_DHCP_OPTION_OVERLOAD        52
#define DHO_DHCP_MESSAGE_TYPE           53
#define DHO_DHCP_SERVER_IDENTIFIER      54
#define DHO_DHCP_PARAMETER_REQUEST_LIST 55
#define DHO_DHCP_MESSAGE                56
#define DHO_DHCP_MAX_MESSAGE_SIZE       57
#define DHO_DHCP_RENEWAL_TIME           58
#define DHO_DHCP_REBINDING_TIME         59
#define DHO_DHCP_CLASS_IDENTIFIER       60
#define DHO_DHCP_CLIENT_IDENTIFIER      61
#define DHO_NISPLUS_DOMAIN              64
#define DHO_NISPLUS_SERVERS             65
#define DHO_TFTP_SERVER                 66
#define DHO_BOOTFILE_NAME               67
#define DHO_MOBILE_IP_HOME_AGENT        68
#define DHO_SMTP_SERVER                 69
#define DHO_POP_SERVER                  70
#define DHO_NNTP_SERVER                 71
#define DHO_WWW_SERVER                  72
#define DHO_FINGER_SERVER               73
#define DHO_IRC_SERVER                  74
#define DHO_STREETTALK_SERVER           75
#define DHO_STREETTALK_DIRECTORY_ASSISTANCE_SERVER      76
#define DHO_DHCP_USER_CLASS_ID          77
#define DHO_RELAY_AGENT_INFORMATION     82
#define DHO_NDS_SERVERS                 85
#define DHO_NDS_TREE_NAME               86
#define DHO_NDS_CONTEXT                 87
#define DHO_IPV6_ONLY_PREFERRED         108
#define DHO_DOMAIN_SEARCH               119
#define DHO_CLASSLESS_STATIC_ROUTES     121
#define DHO_TFTP_CONFIG_FILE            144
#define DHO_VOIP_CONFIGURATION_SERVER   150
#define DHO_CLASSLESS_MS_STATIC_ROUTES  249
#define DHO_AUTOPROXY_SCRIPT            252
#define DHO_END                         255
#define DHO_COUNT                       256     /* # of DHCP options */

/* DHCP message types. */
#define DHCPDISCOVER    1
#define DHCPOFFER       2
#define DHCPREQUEST     3
#define DHCPDECLINE     4
#define DHCPACK         5
#define DHCPNAK         6
#define DHCPRELEASE     7
#define DHCPINFORM      8

/* Ignore parts of DHCP lease */
#define IGN_ROUTES      1
#define IGN_DNS         2

#define MAX_SERVERS     16      /* max servers that can be ignored per if */

#define DHCP_SNAME_LEN          64
#define DHCP_FILE_LEN           128

struct dhcp_hdr {
        uint8_t         op;     /* Message opcode/type */
        uint8_t         htype;  /* Hardware addr type (see net/if_types.h) */
        uint8_t         hlen;   /* Hardware addr length */
        uint8_t         hops;   /* Number of relay agent hops from client */
        uint32_t        xid;    /* Transaction ID */
        uint16_t        secs;   /* Seconds since client started looking */
        uint16_t        flags;  /* Flag bits */
        struct in_addr  ciaddr; /* Client IP address (if already in use) */
        struct in_addr  yiaddr; /* Client IP address */
        struct in_addr  siaddr; /* IP address of next server to talk to */
        struct in_addr  giaddr; /* DHCP relay agent IP address */
        uint8_t         chaddr[16];             /* Client hardware address */
        char            sname[DHCP_SNAME_LEN];  /* Server name */
        char            file[DHCP_FILE_LEN];    /* Boot filename */
};

struct imsgev {
        struct imsgbuf   ibuf;
        void            (*handler)(int, short, void *);
        struct event     ev;
        short            events;
};

struct dhcp_route {
        struct in_addr           dst;
        struct in_addr           mask;
        struct in_addr           gw;
};

enum imsg_type {
        IMSG_NONE,
#ifndef SMALL
        IMSG_CTL_LOG_VERBOSE,
        IMSG_CTL_SHOW_INTERFACE_INFO,
        IMSG_CTL_SEND_REQUEST,
        IMSG_CTL_RELOAD,
        IMSG_CTL_END,
        IMSG_RECONF_CONF,
        IMSG_RECONF_IFACE,
        IMSG_RECONF_VC_ID,
        IMSG_RECONF_C_ID,
        IMSG_RECONF_H_NAME,
        IMSG_RECONF_END,
#endif  /* SMALL */
        IMSG_SEND_DISCOVER,
        IMSG_SEND_REQUEST,
        IMSG_SOCKET_IPC,
        IMSG_OPEN_BPFSOCK,
        IMSG_BPFSOCK,
        IMSG_UDPSOCK,
        IMSG_CLOSE_UDPSOCK,
        IMSG_ROUTESOCK,
        IMSG_CONTROLFD,
        IMSG_STARTUP,
        IMSG_UPDATE_IF,
        IMSG_REMOVE_IF,
        IMSG_DHCP,
        IMSG_CONFIGURE_INTERFACE,
        IMSG_DECONFIGURE_INTERFACE,
        IMSG_PROPOSE_RDNS,
        IMSG_WITHDRAW_RDNS,
        IMSG_WITHDRAW_ROUTES,
        IMSG_REPROPOSE_RDNS,
        IMSG_REQUEST_REBOOT,
};

#ifndef SMALL
struct ctl_engine_info {
        uint32_t                if_index;
        int                     running;
        int                     link_state;
        char                    state[sizeof("IF_INIT_REBOOT")];
        struct timespec         request_time;
        struct in_addr          server_identifier;
        struct in_addr          dhcp_server; /* for unicast */
        struct in_addr          requested_ip;
        struct in_addr          mask;
        struct dhcp_route       routes[MAX_DHCP_ROUTES];
        int                     routes_len;
        struct in_addr          nameservers[MAX_RDNS_COUNT];
        uint32_t                lease_time;
        uint32_t                renewal_time;
        uint32_t                rebinding_time;
};

struct iface_conf {
        SIMPLEQ_ENTRY(iface_conf)        entry;
        char                             name[IF_NAMESIZE];
        uint8_t                         *vc_id;
        size_t                           vc_id_len;
        uint8_t                         *c_id;
        size_t                           c_id_len;
        char                            *h_name;
        int                              ignore;
        struct in_addr                   ignore_servers[MAX_SERVERS];
        int                              ignore_servers_len;
        int                              prefer_ipv6;
};

struct dhcpleased_conf {
        SIMPLEQ_HEAD(iface_conf_head, iface_conf)       iface_list;
};

#endif  /* SMALL */

struct imsg_ifinfo {
        uint32_t                if_index;
        char                    if_name[IF_NAMESIZE];
        int                     rdomain;
        int                     running;
        int                     link_state;
        struct ether_addr       hw_address;
        char                    lease[LEASE_SIZE];
};

struct imsg_propose_rdns {
        uint32_t                if_index;
        int                     rdomain;
        int                     rdns_count;
        struct in_addr          rdns[MAX_RDNS_COUNT];
};

struct imsg_dhcp {
        uint32_t                if_index;
        ssize_t                 len;
        uint16_t                csumflags;
        uint8_t                 packet[1500];
};

struct imsg_req_dhcp {
        uint32_t                if_index;
        uint32_t                xid;
        struct in_addr          ciaddr;
        struct in_addr          requested_ip;
        struct in_addr          server_identifier;
        struct in_addr          dhcp_server;
};

/* dhcpleased.c */
void                     imsg_event_add(struct imsgev *);
int                      imsg_compose_event(struct imsgev *, uint16_t, uint32_t,
                             pid_t, int, void *, uint16_t);
int                      imsg_forward_event(struct imsgev *, struct imsg *);
#ifndef SMALL
void                     config_clear(struct dhcpleased_conf *);
struct dhcpleased_conf  *config_new_empty(void);
void                     merge_config(struct dhcpleased_conf *, struct
                             dhcpleased_conf *);
const char      *sin_to_str(struct sockaddr_in *);
const char      *i2s(uint32_t);

/* frontend.c */
struct iface_conf       *find_iface_conf(struct iface_conf_head *, char *);
int                     *changed_ifaces(struct dhcpleased_conf *, struct
                             dhcpleased_conf *);

/* printconf.c */
void    print_config(struct dhcpleased_conf *);

/* parse.y */
struct dhcpleased_conf  *parse_config(const char *);
int                      cmdline_symset(char *);
#else
#define sin_to_str(x)   ""
#define i2s(x)          ""
#endif  /* SMALL */