dhcp-librawnet.h

this is sample about DHCP-agent

# define TAG_DHCP_SUBNETS_ARE_LOCAL            27
# define TAG_DHCP_BROADCAST_ADDRESS            28
# define TAG_DHCP_MASK_DISCOVERY               29
# define TAG_DHCP_MASK_SUPPLIER                30
# define TAG_DHCP_ROUTER_DISCOVERY             31
# define TAG_DHCP_ROUTER_SOLICITATION          32
# define TAG_DHCP_STATIC_ROUTE                 33
# define TAG_DHCP_TRAILER_ENCAPSULATION        34
# define TAG_DHCP_ARP_CACHE_TIMEOUT            35
# define TAG_DHCP_ETHERNET_ENCAPSULATION       36
# define TAG_DHCP_TCP_DEFAULT_TTL              37
# define TAG_DHCP_TCP_KEEPALIVE_INTERVAL       38
# define TAG_DHCP_TCP_KEEPALIVE_GARBAGE        39
# define TAG_DHCP_NIS_DOMAIN_NAME              40
# define TAG_DHCP_NIS_SERVERS                  41
# define TAG_DHCP_NTP_SERVERS                  42
# define TAG_DHCP_VENDOR_SPECIFIC              43
# define TAG_DHCP_NETBIOSOTCP_NAME_SERVER      44
# define TAG_DHCP_NETBIOSOTCP_DATAGRAM_SERVER  45
# define TAG_DHCP_NETBIOSOTCP_NODE_TYPE        46
# define TAG_DHCP_NETBIOSOTCP_SCOPE            47
# define TAG_DHCP_XWIN_FONT_SERVER             48
# define TAG_DHCP_XWIN_DISP_MANAGER_SERVER     49
# define TAG_DHCP_REQUESTED_IP_ADDRESS         50
# define TAG_DHCP_IP_ADDRESS_LEASE_TIME        51
# define TAG_DHCP_OVERLOAD                     52
# define TAG_DHCP_MESSAGE_TYPE                 53
# define TAG_DHCP_SERVER_IDENTIFIER            54
# define TAG_DHCP_PARAMETERS                   55
# define TAG_DHCP_MESSAGE                      56
# define TAG_DHCP_MAX_DHCP_SIZE                57
# define TAG_DHCP_RENEWAL_TIME                 58
# define TAG_DHCP_REBINDING_TIME               59
# define TAG_DHCP_VENDOR_CLASS_ID              60
# define TAG_DHCP_CLIENT_ID                    61
# define TAG_DHCP_NISPLUS_DOMAIN               64
# define TAG_DHCP_NISPLUS_SERVERS              65
# define TAG_DHCP_TFTP_SERVER                  66
# define TAG_DHCP_BOOT_FILE_NAME               67
# define TAG_DHCP_IP_HOME_AGENT                68
# define TAG_DHCP_SMTP_SERVER                  69
# define TAG_DHCP_POP_SERVER                   70
# define TAG_DHCP_NNTP_SERVER                  71
# define TAG_DHCP_DEFAULT_WWW_SERVER           72
# define TAG_DHCP_DEFAULT_FINGER_SERVER        73
# define TAG_DHCP_DEFAULT_IRC_SERVER           74
# define TAG_DHCP_DEFAULT_ST_SERVER            75
# define TAG_DHCP_DEFAULT_STDA_SERVER          76
# define TAG_DHCP_END                          255

/* DHCP overload option values. */

#define DHCP_OVERLOAD_FILE  1
#define DHCP_OVERLOAD_SNAME 2
#define DHCP_OVERLOAD_BOTH  3

/* NetBIOS Scope Node Types */

# define NETBIOS_B_NODE 0x01
# define NETBIOS_P_NODE 0x02
# define NETBIOS_M_NODE 0x04
# define NETBIOS_H_NODE 0x06

/* prototypes. */

/* rawnet routines. */
extern rawnet_t *rawnet_create(const char *device, const char *filter, int mtu, int sport, 
                               int dport, int promiscuous, int clear_address);
extern void rawnet_destroy(rawnet_t *net);
extern int rawnet_get_packet(rawnet_t *net, struct timeval *tm);
extern int rawnet_get_hw_addr(rawnet_t *net, eth_addr_t *addr);
extern int rawnet_get_real_hw_addr(rawnet_t *net, eth_addr_t *addr);
extern ip_addr_t rawnet_get_ip_addr(rawnet_t *net);
extern uint16_t rawnet_get_mtu(rawnet_t *net);
extern int rawnet_send_packet(rawnet_t *net);
extern int rawnet_use_fake_hw_addr(rawnet_t *raw, char *mac_string);
extern void reinitialize_rawnet(rawnet_t *net, int promiscuous);

extern int rawnet_up(rawnet_t *net);
extern void rawnet_down(rawnet_t *net);

extern int rawnet_packet_transact(rawnet_t *net, void *arg,
                                  void (*update) (void *arg),
                                  int (*check) (void *arg), time_t max_timeout);

extern int rawnet_interface_up(rawnet_t *net, ip_addr_t addr, ip_addr_t netmask, int mtu, int clear_address);
extern int rawnet_interface_down(rawnet_t *net);
extern list_t *rawnet_list_active_interfaces(void);
extern list_t *rawnet_list_inactive_interfaces(void);

extern void rawnet_dhcp_update(rawnet_t *net, time_t seconds);
extern int rawnet_is_dhcp_offer(rawnet_t *net);
extern int rawnet_is_valid(rawnet_t *net);
extern const char *rawnet_get_device_name(rawnet_t *net);
extern int rawnet_get_datalink_type(rawnet_t *net);

/* packet building routines. */

/* dhcp packet routines. */
extern void build_dhcp_discover(rawnet_t *net, uint32_t xid, time_t secs, list_t *options);
extern void build_dhcp_request_unicast(rawnet_t *net, uint32_t xid, time_t secs, list_t *options, ip_addr_t cip_addr, 
                                       ip_addr_t sip_addr, ip_addr_t gip_addr, eth_addr_t shw_addr);
extern void build_dhcp_request_broadcast(rawnet_t *net, uint32_t xid, time_t secs, ip_addr_t cip_addr, 
                                         ip_addr_t sip_addr, list_t *options);
extern void build_dhcp_release(rawnet_t *net, uint32_t xid, list_t *options, ip_addr_t cip_addr, 
                               ip_addr_t sip_addr, eth_addr_t shw_addr);
extern void build_dhcp_decline(rawnet_t *net, uint32_t xid, time_t secs, list_t *options);

/* arp packet routines. */
extern void build_arp_reply_broadcast(rawnet_t *net, uint32_t source_addr,
                                      eth_addr_t source_hw_addr);

extern void build_arp_reply(rawnet_t *net,
                            uint32_t source_addr,
                            uint32_t dest_addr, eth_addr_t source_hw_addr, eth_addr_t dest_hw_addr);

extern void build_arp_request(rawnet_t *net,
                              uint32_t source_addr, uint32_t dest_addr, eth_addr_t source_hw_addr);

extern void build_unarp(rawnet_t *net, uint32_t source_addr, eth_addr_t source_hw_addr);

/* icmp packet routines. */
extern void build_icmp_mask_request(rawnet_t *net, uint32_t id, uint32_t seq);
extern void build_icmp_mask_reply(rawnet_t *net, uint32_t id, uint32_t seq, uint32_t subnet_mask);
extern void build_icmp_echo_request(rawnet_t *net, ip_addr_t source_addr, ip_addr_t dest_addr,
                                    eth_addr_t source_mac, eth_addr_t dest_mac, uint16_t id,
                                    uint16_t seq);

/* DHCP obj routines. */
extern dhcp_obj *dhcp_create(void);
extern void dhcp_purge(dhcp_obj * dhcp);
extern void dhcp_destroy(dhcp_obj * dhcp);

extern uint8_t dhcp_get_op(dhcp_obj * dhcp);
extern uint8_t dhcp_get_htype(dhcp_obj * dhcp);
extern uint8_t dhcp_get_hlen(dhcp_obj * dhcp);
extern uint8_t dhcp_get_hops(dhcp_obj * dhcp);
extern uint32_t dhcp_get_xid(dhcp_obj * dhcp);
extern uint16_t dhcp_get_secs(dhcp_obj * dhcp);
extern uint16_t dhcp_get_flags(dhcp_obj * dhcp);
extern uint32_t dhcp_get_ciaddr(dhcp_obj * dhcp);
extern uint32_t dhcp_get_yiaddr(dhcp_obj * dhcp);
extern uint32_t dhcp_get_siaddr(dhcp_obj * dhcp);
extern uint32_t dhcp_get_giaddr(dhcp_obj * dhcp);
extern uint8_t *dhcp_get_chaddr(dhcp_obj * dhcp);
extern uint8_t *dhcp_get_sname(dhcp_obj * dhcp);
extern uint8_t *dhcp_get_filename(dhcp_obj * dhcp);
extern uint32_t dhcp_get_magic_cookie(dhcp_obj * dhcp);

extern void dhcp_set_op(dhcp_obj * dhcp, uint8_t op);
extern void dhcp_set_htype(dhcp_obj * dhcp, uint8_t htype);
extern void dhcp_set_hlen(dhcp_obj * dhcp, uint8_t hlen);
extern void dhcp_set_hops(dhcp_obj * dhcp, uint8_t hops);
extern void dhcp_set_xid(dhcp_obj * dhcp, uint32_t xid);
extern void dhcp_set_secs(dhcp_obj * dhcp, uint16_t secs);
extern void dhcp_set_flag_broadcast(dhcp_obj * dhcp);
extern void dhcp_unset_flag_broadcast(dhcp_obj * dhcp);
extern void dhcp_set_ciaddr(dhcp_obj * dhcp, uint32_t ciaddr);
extern void dhcp_set_yiaddr(dhcp_obj * dhcp, uint32_t yiaddr);
extern void dhcp_set_siaddr(dhcp_obj * dhcp, uint32_t siaddr);
extern void dhcp_set_giaddr(dhcp_obj * dhcp, uint32_t giaddr);
extern void dhcp_set_chaddr(dhcp_obj * dhcp, uint8_t *chaddr, int len);
extern void dhcp_clear_chaddr(dhcp_obj * dhcp);
extern void dhcp_set_sname(dhcp_obj * dhcp, uint8_t *sname);
extern void dhcp_set_filename(dhcp_obj * dhcp, uint8_t *file);
extern void dhcp_clear_sname(dhcp_obj * dhcp);
extern void dhcp_clear_filename(dhcp_obj * dhcp);
extern void dhcp_set_magic_cookie(dhcp_obj * dhcp);
extern void dhcp_set_options(dhcp_obj * dhcp, list_t *options);

extern void dhcp_reset_option_seek(dhcp_obj * dhcp);
extern dhcp_opt_t *dhcp_get_next_option(dhcp_obj * dhcp);

extern uint16_t dhcp_get_options_len(list_t *options);

extern int dhcp_valid_magic_cookie(dhcp_obj * dhcp);
extern int dhcp_is_type(dhcp_obj * dhcp, uint8_t type);
extern int dhcp_have_option(dhcp_obj *dhcp, uint8_t tag);
extern int dhcp_is_file_overload(dhcp_obj * dhcp);
extern int dhcp_is_sname_overload(dhcp_obj * dhcp);

extern int dhcp_read_packet_image(dhcp_obj * dhcp, const uint8_t *dhcp_packet, int len);
extern void dhcp_write_options(dhcp_obj * dhcp, uint8_t *packet);
extern void dhcp_write_packet_image(dhcp_obj * dhcp, uint8_t *packet);

extern uint32_t dhcp_gen_xid(void);

/* Ether obj routines. */
extern eth_obj *eth_create(void);
extern void eth_destroy(eth_obj * eth);
extern int eth_read_packet_image(eth_obj * eth, const unsigned char *packet, int len);
extern void eth_write_packet_image(eth_obj * eth, unsigned char *packet);

extern eth_addr_t eth_get_src_addr(eth_obj * eth);
extern eth_addr_t eth_get_dst_addr(eth_obj * eth);
extern uint16_t eth_get_type(eth_obj * eth);

extern void eth_set_src_addr(eth_obj * eth, eth_addr_t addr);
extern void eth_set_dst_addr(eth_obj * eth, eth_addr_t addr);
extern void eth_set_type(eth_obj * eth, uint16_t type);

/* IP obj routines. */
extern ip_obj *ip_create(void);
extern void ip_destroy(ip_obj * ip);
extern int ip_read_packet_image(ip_obj * ip, const unsigned char *packet, int len);
extern void ip_write_packet_image(ip_obj * ip, unsigned char *packet);

extern ip_addr_t ip_get_src_addr(ip_obj * ip);
extern ip_addr_t ip_get_dst_addr(ip_obj * ip);
extern unsigned char ip_get_hl(ip_obj * ip);
extern uint8_t ip_get_proto(ip_obj * ip);

extern void ip_set_hl(ip_obj * ip, uint16_t header_len);
extern void ip_set_tos(ip_obj * ip, unsigned char ip_tos);
extern void ip_set_len(ip_obj * ip, uint16_t ip_len);
extern void ip_set_id(ip_obj * ip, uint16_t ip_id);
extern void ip_set_off(ip_obj * ip, uint16_t ip_off);
extern void ip_set_ttl(ip_obj * ip, uint8_t ip_ttl);
extern void ip_set_proto(ip_obj * ip, unsigned char ip_proto);
extern void ip_set_src_addr(ip_obj * ip, uint32_t ip_src);
extern void ip_set_dst_addr(ip_obj * ip, uint32_t ip_src);

/* ARP obj routines. */
extern arp_obj *arp_create(void);
extern void arp_destroy(arp_obj * arp);
extern void arp_write_packet_image(arp_obj * arp, unsigned char *packet);

extern void arp_set_hardware_type(arp_obj * arp, uint16_t hdr_addr);
extern void arp_set_protocol_type(arp_obj * arp, uint16_t pro);
extern void arp_set_hardware_len(arp_obj * arp, uint8_t len);
extern void arp_set_protocol_len(arp_obj * arp, uint8_t len);
extern void arp_set_op(arp_obj * arp, uint16_t op);
extern void arp_set_sender_hardware_address(arp_obj * arp, eth_addr_t addr);
extern void arp_set_sender_protocol_address(arp_obj * arp, uint32_t addr);
extern void arp_set_target_hardware_address(arp_obj * arp, eth_addr_t addr);
extern void arp_set_target_protocol_address(arp_obj * arp, uint32_t addr);

extern uint16_t arp_get_op(arp_obj * arp);
extern uint16_t arp_get_hardware_type(arp_obj * arp);
extern uint16_t arp_get_protocol_type(arp_obj * arp);
extern uint8_t arp_get_hardware_len(arp_obj * arp);
extern uint8_t arp_get_protocol_len(arp_obj * arp);
extern unsigned char *arp_get_sender_hardware_address(arp_obj * arp);
extern unsigned char *arp_get_sender_protocol_address(arp_obj * arp);

extern int arp_read_packet_image(arp_obj * arp, const unsigned char *packet, int len);

/* UDP obj routines. */
extern udp_obj *udp_create(void);
extern void udp_destroy(udp_obj * udp);
extern int udp_read_packet_image(udp_obj * udp, const unsigned char *packet, int len);
extern void udp_write_packet_image(udp_obj * udp, unsigned char *packet);

extern uint16_t udp_get_src_port(udp_obj * udp);
extern uint16_t udp_get_dst_port(udp_obj * udp);
extern uint16_t udp_get_len(udp_obj * udp);

extern void udp_set_src_port(udp_obj * udp, uint16_t src_port);
extern void udp_set_dst_port(udp_obj * udp, uint16_t dst_port);
extern void udp_set_len(udp_obj * udp, uint16_t len);
extern void udp_set_cksum(udp_obj * udp, uint16_t cksum);

/* ICMP obj routines. */
extern icmp_obj *icmp_create(void);
extern void icmp_destroy(icmp_obj * icmp);

extern void icmp_set_type(icmp_obj * icmp, uint8_t type);
extern void icmp_set_code(icmp_obj * icmp, uint8_t code);
extern void icmp_clear_cksum(icmp_obj * icmp);
extern void icmp_mask_set_id(icmp_obj * icmp, uint32_t id);
extern void icmp_mask_set_seq(icmp_obj * icmp, uint32_t seq);
extern void icmp_mask_set_mask(icmp_obj * icmp, uint32_t mask);
extern void icmp_echo_set_id(icmp_obj * icmp, uint16_t id);
extern void icmp_echo_set_seq(icmp_obj * icmp, uint16_t seq);

extern uint8_t icmp_get_type(icmp_obj * icmp);
extern uint32_t icmp_mask_get_mask(icmp_obj * icmp_p);
extern void icmp_write_packet_image(icmp_obj * icmp, unsigned char *packet);
extern int icmp_read_packet_image(icmp_obj * icmp, const unsigned char *packet, int len);

/* ICMP discovery routines. */
extern int icmp_subnet_mask_discovery(rawnet_t *net, int retries, uint32_t *subnet_mask);
extern list_t *icmp_rtt_discovery(rawnet_t *net, int timeout, int sends, int arp_retries, int arp_timeout, list_t *addresses);

/* ARP discovery routines. */
extern int arp_discover_hardware_address(rawnet_t *net, int retries, int timeout, uint32_t address,
                                         eth_addr_t *mac_addr);

/* Routing routines. */
extern int route_find(rawnet_t *net, int sends, int timeout, ip_addr_t addr, eth_addr_t *dest_mac);

/* Misc. */
extern int rawnet_port_for_service(const char *serv, const char *proto);
extern char *rawnet_network_address_to_string_static(uint32_t addr);

#endif                          /* DHCP_LIBRAWNET_H */