List of libnet functions

The interface functions provided by Libnet can be divided into four categories according to their function:
* Memory management (allocation and deallocation) functions
* Address resolution function
* Packet Constructors
* Packet sending function

these interface functions and their functions are listed below (their parameters are simple to understand and no longer explained):

★Memory management functions

single packet Memory initialization：
int Libnet_init_packet (U_short packet_size, U_char **buf);

single packet Memory release：
void Libnet_destroy_packet (U_char **buf);

multi-Packet Memory initialization：
int Libnet_init_packet_arena (struct Libnet_arena **arena,u_short packet_num, U_short packet_size);

accessing the next packet in multi-packet memory：
U_char *libnet_next_packet_from_arena (struct Libnet_arena **arena,u_short packet_size);

multi-packet Memory release：
void Libnet_destroy_packet_arena (struct Libnet_arena **arena);


★Address resolution functions

Resolve host name：
U_char *libnet_host_lookup (u_long IP, u_short use_name);

Resolve host name (reentrant function)：
void Libnet_host_lookup_r (u_long IP, u_short use_name, U_char *buf);

Domain Name Resolution：
U_long libnet_name_resolve (U_char *ip, u_short use_name);

Get interface Device IP address：
U_long libnet_get_ipaddr (struct libnet_link_int *l,const u_char *device, const U_char *EBUF);

Get interface Device hardware address：
struct ether_addr *libnet_get_hwaddr (struct libnet_link_int *l,const u_char *device,const u_char *ebuf);


★Packet Constructors

ARP Protocol packet：
int Libnet_build_arp (u_short hrdw, u_short prot, U_short h_len,u_short P_len, U_short op, U_char *s_ha,
U_char *s_pa, U_char *t_ha, U_char *t_pa,const u_char *payload, int payload_len,u_char *packet_buf);

DNS Protocol Packets：
int Libnet_build_dns (u_short ID, u_short flags, U_short num_q,u_short NUM_ANSW_RR, U_short num_auth_rr,
U_short NUM_ADD_RR, const U_CHAR * payload,int Payload_len, U_char *packet_buf);

Ethernet Protocol Packets：
int libnet_build_ethernet (U_char *daddr, U_char *saddr, u_short id,const u_char *payload, int payload_len,
U_char *packet_buf);

ICMP Protocol Packet (icmp_echo/icmp_echoreply)：
int Libnet_build_icmp_echo (u_char type, U_char code, u_short ID,
U_short seq, const U_char *payload,int payload_len, U_char *packet_buf);

ICMP Protocol Packet (icmp_maskreq/icmp_maskreply)：
int Libnet_build_icmp_mask (u_char type, U_char code, u_short ID,
U_short seq, u_long mask,const u_char *payload, int payload_len,
U_char *packet_buf);

ICMP Protocol Packet (Icmp_unreach)：
int Libnet_build_icmp_unreach (u_char type, U_char code,
U_short Orig_len, U_char orig_tos,u_short orig_id, U_short Orig_frag,
U_char Orig_ttl, U_char orig_prot,u_long orig_saddr, U_long orig_daddr,
Const U_CHAR *payload, int payload_len,u_char *packet_buf);

ICMP Protocol Packet (icmp_timexceed)：
int Libnet_build_icmp_timeexceed (u_char type, U_char code,
U_short Orig_len, U_char orig_tos,u_short orig_id, U_short Orig_frag,
U_char Orig_ttl, U_char orig_prot,u_long orig_saddr, U_long orig_daddr,
Const U_CHAR *payload, int payload_len,u_char *packet_buf);

ICMP Protocol Packet (Icmp_redirect)：
int Libnet_build_icmp_redirect (u_char type, U_char code, U_long Gateway,
U_short Orig_len, U_char orig_tos,u_short orig_id, U_short Orig_frag,
U_char Orig_ttl, U_char orig_prot,u_long orig_saddr, U_long orig_daddr,
Const U_CHAR *payload, int payload_len,u_char *packet_buf);

ICMP Protocol Packet (icmp_tstamp/icmp_tstampreply)：
int Libnet_build_icmp_timestamp (u_char type, U_char code, u_short ID,
U_short seq, n_time otime, N_time rtime,n_time ttime, const U_char *payload,
int Payload_len, U_char *packet_buf);

IGMP protocol Packets：
int Libnet_build_igmp (u_char type, U_char code, u_long IP,
Const U_CHAR *payload, int payload_len,u_char *packet_buf);

IP protocol Packets：
int Libnet_build_ip (U_short len, U_char tos, U_short ip_id, U_short frag,u_char TTL, U_char protocol, U_long Saddr, U_long DADDR, const U_char *payload, int payload_len,u_char *packet_buf);

OSPF routing protocol packets：
int LIBNET_BUILD_OSPF (U_short len, U_char type, U_long router_id,u_long area_id, U_short Auth_type,
const char *payload, int payload_s, U_char *buf);

OSPF Routing protocol Packet (Hello)：
int Libnet_build_ospf_hello (u_long netmask, u_short interval,
U_char options, U_char priority,u_int dead_interval, U_long Des_router,
U_long Backup, U_long neighbor,const char *payload, int payload_s,u_char *buf);

OSPF routing protocol Packet (database Description (DBD))：
int libnet_build_ospf_dbd (U_short len, U_char options, U_char type,
U_int sequence_num, const char *payload,int payload_s, U_char *buf);

OSPF Routing protocol packet (Link state Request (LSR))：
int LIBNET_BUILD_OSPF_LSR (u_int type, U_int ls_id, U_long Adv_router,
const char *payload, int payload_s,u_char *buf);

OSPF Routing protocol packet (Link state Update (LSU))：
int LIBNET_BUILD_OSPF_LSU (u_int num, const char *payload,int payload_s, U_char *buf);

OSPF Routing protocol packet (Link State acknowledgement (LSA))：
int Libnet_build_ospf_lsa (u_short age, U_char options, U_char type,u_int ls_id, U_long adv_router, U_int sequence_num, u_s Hort len,const char *payload, int payload_s,u_char *buf);

OSPF Routing protocol packet (OSPF Link Sate networklink State Router)：
int libnet_build_ospf_lsa_net (U_long netmask, U_int router_id,
const char *payload, int payload_s,u_char *buf);

OSPF Routing protocol packet (Link state Router)：
int LIBNET_BUILD_OSPF_LSA_RTR (u_short flags, u_short num, u_int ID,
U_int data, U_char type, U_char tos,u_short metric, const char *payload,int payload_s, U_char *buf);

OSPF Routing protocol packet (Link state Summary)：
int Libnet_build_ospf_lsa_sum (u_long netmask, U_int metric, U_int tos,
const char *payload, int payload_s,u_char *buf);

OSPF Routing protocol packet (Link State as External)：
int Libnet_build_ospf_lsa_as (u_long netmask, U_int metric,
U_long fwd_addr, U_int tag,const char *payload, int payload_s,u_char *buf);

RIP Routing protocol packets：
int Libnet_build_rip (u_char cmd, U_char ver, u_short domain,
U_short Addr_fam, U_short route_tag, U_long Ip,u_long mask, u_long next_hop, U_long metric,
Const U_CHAR *payload, int payload_len,u_char *packet_buf);

TCP protocol Packets：
int libnet_build_tcp (u_short th_sport, U_short th_dport, U_long th_seq,
U_long Th_ack, U_char th_flags, u_short th_win,u_short Th_urg, const U_char *payload,int payload_len, U_char *packet_buf);

UDP protocol Packets：
int libnet_build_udp (U_short sport, u_short dport, const U_char *payload,int payload_len, U_char *packet_buf);

IP Protocol Packet Options：
int Libnet_insert_ipo (struct ipoption *opt, U_char Opt_len,u_char *packet_buf);

TCP protocol Packet options：
int LIBNET_INSERT_TCPO (struct tcpoption *opt, U_char Opt_len,u_char *packet_buf);


★Packet send function

Open the raw socket：
int Libnet_open_raw_sock (int protocol);

Close Raw Socket：
int libnet_close_raw_sock (int socket);

Select an interface device：
int Libnet_select_device (struct sockaddr_in *sin,
U_char **device, U_char *ebuf);

Open the link layer interface device：
struct Libnet_link_int *libnet_open_link_interface (char *device,char *ebuf);

close the link layer Interface device：
int libnet_close_link_interface (struct libnet_link_int *l);

Sending IP packets：
int libnet_write_ip (int socket, U_char *packet, int packet_size);

Send link Layer packets：
int Libnet_write_link_layer (struct libnet_link_int *l,const u_char *device, U_char *packet,int packet_size);

Inspection and calculation：
int Libnet_do_checksum (U_char *packet, int protocol, int packet_size);


★Related support functions

random number seed generator：
int Libnet_seed_prand ();

get random number：
U_long libnet_get_prand (int modulus);

16 binary data output：
void Libnet_hex_dump (U_char * buf, int len, int swap, FILE *stream);

Port list Chain initialization：
int libnet_plist_chain_new (struct libnet_plist_chain **plist,char *token_list);

get port list Next item (port range) for the chain :
int libnet_plist_chain_next_pair (struct Libnet_plist_chain * Plist,u_short *bport, U_short *eport);

port list Chain output display :
int libnet_plist_chain_dump (struct libnet_plist_chain *plist);

get port list chain :
u_char *libnet_plist_chain_dump_string (struct libnet_plist_chain *plist) ;

port list Chain Memory release :

void Libnet_plist_chain_free (struct libnet_plist_chain *plist);

Transfer from: Libnet of the underlying network development library

List of libnet functions