/usr/include/libndpi-2.2.0/libndpi/ndpi_api.h is in libndpi-dev 2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ndpi_api.h
*
* Copyright (C) 2011-17 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef __NDPI_API_H__
#define __NDPI_API_H__
#include "ndpi_main.h"
#ifdef __cplusplus
extern "C" {
#endif
#define SIZEOF_ID_STRUCT (sizeof(struct ndpi_id_struct))
#define SIZEOF_FLOW_STRUCT (sizeof(struct ndpi_flow_struct))
#define NDPI_DETECTION_ONLY_IPV4 ( 1 << 0 )
#define NDPI_DETECTION_ONLY_IPV6 ( 1 << 1 )
#define ADD_TO_DETECTION_BITMASK 1
#define NO_ADD_TO_DETECTION_BITMASK 0
#define SAVE_DETECTION_BITMASK_AS_UNKNOWN 1
#define NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN 0
/**
* Check if a string is encoded with punycode
* ( https://tools.ietf.org/html/rfc3492 )
*
* @par buff = pointer to the string to ckeck
* @par len = len of the string
* @return 1 if the string is punycoded;
* else 0
*
*/
int check_punycode_string(char * buff , int len);
/**
* Get the size of the flow struct
*
* @return the size of the flow struct
*
*/
u_int32_t ndpi_detection_get_sizeof_ndpi_flow_struct(void);
/**
* Get the size of the id struct
*
* @return the size of the id struct
*
*/
u_int32_t ndpi_detection_get_sizeof_ndpi_id_struct(void);
/**
* nDPI personal allocation and free functions
**/
void * ndpi_malloc(size_t size);
void * ndpi_calloc(unsigned long count, size_t size);
void * ndpi_realloc(void *ptr, size_t old_size, size_t new_size);
char * ndpi_strdup(const char *s);
void ndpi_free(void *ptr);
void * ndpi_flow_malloc(size_t size);
void ndpi_flow_free(void *ptr);
/**
* Search the first occurrence of substring -find- in -s-
* The search is limited to the first -slen- characters of the string
*
* @par s = string to parse
* @par find = string to match with -s-
* @par slen = max length to match between -s- and -find-
* @return a pointer to the beginning of the located substring;
* NULL if the substring is not found
*
*/
char* ndpi_strnstr(const char *s, const char *find, size_t slen);
/**
* Same as ndpi_strnstr but case insensitive
*
* @par s = string to parse
* @par find = string to match with -s-
* @par slen = max length to match between -s- and -find-
* @return a pointer to the beginning of the located substring;
* NULL if the substring is not found
*
*/
char* ndpi_strncasestr(const char *s, const char *find, size_t slen);
/**
* Returns the nDPI protocol id for IP-based protocol detection
*
* @par ndpi_struct = the struct created for the protocol detection
* @par pin = IP host address (MUST BE in network byte order):
* See man(7) ip for details
* @return the nDPI protocol ID
*
*/
u_int16_t ndpi_network_ptree_match(struct ndpi_detection_module_struct *ndpi_struct, struct in_addr *pin);
/**
* Init single protocol match
*
* @par ndpi_mod = the struct created for the protocol detection
* @par match = the struct passed to match the protocol
*
*/
void ndpi_init_protocol_match(struct ndpi_detection_module_struct *ndpi_mod, ndpi_protocol_match *match);
/**
* Returns a new initialized detection module
*
* @return the initialized detection module
*
*/
struct ndpi_detection_module_struct *ndpi_init_detection_module(void);
/**
* Frees the memory allocated in the specified flow
*
* @par flow = the flow to deallocate
*
*/
void ndpi_free_flow(struct ndpi_flow_struct *flow);
/**
* Enables cache support.
* In nDPI is used for some protocol (i.e. Skype)
*
* @par ndpi_mod = the struct created for the protocol detection
* @par host = string for the host name
* @par port = unsigned int for the port number
*
*/
void ndpi_enable_cache(struct ndpi_detection_module_struct *ndpi_mod, char* host, u_int port);
/**
* Destroys the detection module
*
* @par ndpi_struct = the struct to clearing for the detection module
*
*/
void ndpi_exit_detection_module(struct ndpi_detection_module_struct *ndpi_struct);
/**
* Sets a single protocol bitmask
* This function does not increment the index of the callback_buffer
*
* @par label = string for the protocol name
* @par ndpi_struct = the detection module
* @par detection_bitmask = the protocol bitmask
* @par idx = the index of the callback_buffer
* @par func = function pointer of the protocol search
* @par ndpi_selection_bitmask = the protocol selected bitmask
* @par b_save_bitmask_unknow = if set as "true" save the detection bitmask as unknow
* @par b_add_detection_bitmask = if set as "true" add the protocol bitmask to the detection bitmask
*
*/
void ndpi_set_bitmask_protocol_detection(char *label, struct ndpi_detection_module_struct *ndpi_struct,
const NDPI_PROTOCOL_BITMASK *detection_bitmask,
const u_int32_t idx,
u_int16_t ndpi_protocol_id,
void (*func) (struct ndpi_detection_module_struct *, struct ndpi_flow_struct *flow),
const NDPI_SELECTION_BITMASK_PROTOCOL_SIZE ndpi_selection_bitmask,
u_int8_t b_save_bitmask_unknow,
u_int8_t b_add_detection_bitmask);
/**
* Sets the protocol bitmask2
*
* @par ndpi_struct = the detection module
* @par detection_bitmask = the protocol bitmask to set
*
*/
void ndpi_set_protocol_detection_bitmask2(struct ndpi_detection_module_struct *ndpi_struct,
const NDPI_PROTOCOL_BITMASK * detection_bitmask);
/**
* Function to be called before we give up with detection for a given flow.
* This function reduces the NDPI_UNKNOWN_PROTOCOL detection
*
* @par ndpi_struct = the detection module
* @par flow = the flow given for the detection module
* @return the detected protocol even if the flow is not completed;
*
*/
ndpi_protocol ndpi_detection_giveup(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow);
/**
* Processes an extra packet in order to get more information for a given protocol
* (like SSL getting both client and server certificate even if we already know after
* seeing the client certificate what the protocol is)
*
* @par ndpi_struct = the detection module
* @par flow = pointer to the connection state machine
* @par packet = unsigned char pointer to the Layer 3 (IP header)
* @par packetlen = the length of the packet
* @par current_tick = the current timestamp for the packet
* @par src = pointer to the source subscriber state machine
* @par dst = pointer to the destination subscriber state machine
* @return void
*
*/
void ndpi_process_extra_packet(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
const unsigned char *packet,
const unsigned short packetlen,
const u_int64_t current_tick,
struct ndpi_id_struct *src,
struct ndpi_id_struct *dst);
/**
* Processes one packet and returns the ID of the detected protocol.
* This is the MAIN PACKET PROCESSING FUNCTION.
*
* @par ndpi_struct = the detection module
* @par flow = pointer to the connection state machine
* @par packet = unsigned char pointer to the Layer 3 (IP header)
* @par packetlen = the length of the packet
* @par current_tick = the current timestamp for the packet
* @par src = pointer to the source subscriber state machine
* @par dst = pointer to the destination subscriber state machine
* @return the detected ID of the protocol
*
*/
ndpi_protocol ndpi_detection_process_packet(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
const unsigned char *packet,
const unsigned short packetlen,
const u_int64_t current_tick,
struct ndpi_id_struct *src,
struct ndpi_id_struct *dst);
/**
* Get the main protocol of the passed flows for the detected module
*
*
* @par ndpi_struct = the detection module
* @par flow = the flow given for the detection module
* @return the ID of the master protocol detected
*
*/
u_int16_t ndpi_get_flow_masterprotocol(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow);
/**
* Query the pointer to the layer 4 packet
*
* @par l3 = pointer to the layer 3 data
* @par l3_len = length of the layer 3 data
* @par l4_return = address to the pointer of the layer 4 data if return value == 0, else undefined
* @par l4_len_return = length of the layer 4 data if return value == 0, else undefined
* @par l4_protocol_return = protocol of the layer 4 data if return value == 0, undefined otherwise
* @par flags = limit operation on ipv4 or ipv6 packets. Possible values: NDPI_DETECTION_ONLY_IPV4 - NDPI_DETECTION_ONLY_IPV6 - 0 (any)
* @return 0 if layer 4 data could be found correctly;
else != 0
*
*/
u_int8_t ndpi_detection_get_l4(const u_int8_t *l3, u_int16_t l3_len, const u_int8_t **l4_return, u_int16_t *l4_len_return,
u_int8_t *l4_protocol_return, u_int32_t flags);
/**
* Search and return the protocol based on matched ports
*
* @par ndpi_struct = the detection module
* @par shost = source address in host byte order
* @par sport = source port number
* @par dhost = destination address in host byte order
* @par dport = destination port number
* @return the struct ndpi_protocol that match the port base protocol
*
*/
ndpi_protocol ndpi_find_port_based_protocol(struct ndpi_detection_module_struct *ndpi_struct/* , u_int8_t proto */,
u_int32_t shost,
u_int16_t sport,
u_int32_t dhost,
u_int16_t dport);
/**
* Search and return the protocol guessed that is undetected
*
* @par ndpi_struct = the detection module
* @par proto = the l4 protocol number
* @par shost = source address in host byte order
* @par sport = source port number
* @par dhost = destination address in host byte order
* @par dport = destination port number
* @return the struct ndpi_protocol that match the port base protocol
*
*/
ndpi_protocol ndpi_guess_undetected_protocol(struct ndpi_detection_module_struct *ndpi_struct,
u_int8_t proto,
u_int32_t shost,
u_int16_t sport,
u_int32_t dhost,
u_int16_t dport);
/**
* Check if the string passed match with a protocol
*
* @par ndpi_struct = the detection module
* @par string_to_match = the string to match
* @par string_to_match_len = the length of the string
* @par is_host_match = value of the second field of struct ndpi_automa
* @return the ID of the matched subprotocol
*
*/
int ndpi_match_string_subprotocol(struct ndpi_detection_module_struct *ndpi_struct,
char *string_to_match,
u_int string_to_match_len,
u_int8_t is_host_match);
/**
* Check if the host passed match with a protocol
*
* @par ndpi_struct = the detection module
* @par flow = the flow where match the host
* @par string_to_match = the string to match
* @par string_to_match_len = the length of the string
* @par master_protocol_id = value of the ID associated to the master protocol detected
* @return the ID of the matched subprotocol
*
*/
int ndpi_match_host_subprotocol(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
char *string_to_match,
u_int string_to_match_len,
u_int16_t master_protocol_id);
/**
* Check if the string content passed match with a protocol
*
* @par ndpi_struct = the detection module
* @par flow = the flow where match the host
* @par string_to_match = the string to match
* @par string_to_match_len = the length of the string
* @par master_protocol_id = value of the ID associated to the master protocol detected
* @return the ID of the matched subprotocol
*
*/
int ndpi_match_content_subprotocol(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
char *string_to_match,
u_int string_to_match_len,
u_int16_t master_protocol_id);
/**
* Check if the string -bigram_to_match- match with a bigram of -automa-
*
* @par ndpi_mod = the detection module
* @par automa = the struct ndpi_automa for the bigram
* @par bigram_to_match = the bigram string to match
* @return 0
*
*/
int ndpi_match_bigram(struct ndpi_detection_module_struct *ndpi_mod,
ndpi_automa *automa,
char *bigram_to_match);
/**
* Write the protocol name in the buffer -buf- as master_protocol.protocol
*
* @par ndpi_mod = the detection module
* @par proto = the struct ndpi_protocol contain the protocols name
* @par buf = the buffer to write the name of the protocols
* @par buf_len = the length of the buffer
* @return the buffer contains the master_protocol and protocol name
*
*/
char* ndpi_protocol2name(struct ndpi_detection_module_struct *ndpi_mod, ndpi_protocol proto, char *buf, u_int buf_len);
/**
* Find out if a given category is custom/user-defined
*
* @par category = the category associated to the protocol
* @return 1 if this is a custom user category, 0 otherwise
*
*/
int ndpi_is_custom_category(ndpi_protocol_category_t category);
/**
* Overwrite a protocol category defined by nDPI with the custom category
*
* @par ndpi_mod = the detection module
* @par protoId = the protocol identifier to overwrite
* @par breed = the breed to be associated to the protocol
*
*/
void ndpi_set_proto_breed(struct ndpi_detection_module_struct *ndpi_mod,
u_int16_t protoId, ndpi_protocol_breed_t breed);
/**
* Overwrite a protocol category defined by nDPI with the custom category
*
* @par ndpi_mod = the detection module
* @par protoId = the protocol identifier to overwrite
* @par category = the category associated to the protocol
*
*/
void ndpi_set_proto_category(struct ndpi_detection_module_struct *ndpi_mod,
u_int16_t protoId, ndpi_protocol_category_t protoCategory);
/**
* Check if subprotocols of the specified master protocol are just
* informative (and not real)
*
* @par mod = the detection module
* @par protoId = the (master) protocol identifier to query
* @return 1 = the subprotocol is informative, 0 otherwise.
*
*/
u_int8_t ndpi_is_subprotocol_informative(struct ndpi_detection_module_struct *ndpi_mod,
u_int16_t protoId);
/**
* Get protocol category as string
*
* @par mod = the detection module
* @par category = the category associated to the protocol
* @return the string name of the category
*
*/
const char* ndpi_category_get_name(struct ndpi_detection_module_struct *ndpi_mod,
ndpi_protocol_category_t category);
/**
* Set protocol category string
*
* @par mod = the detection module
* @par category = the category associated to the protocol
* @paw name = the string name of the category
*
*/
void ndpi_category_set_name(struct ndpi_detection_module_struct *ndpi_mod,
ndpi_protocol_category_t category, char *name);
/**
* Get protocol category
*
* @par ndpi_mod = the detection module
* @par proto = the struct ndpi_protocol contain the protocols name
* @return the protocol category
*/
ndpi_protocol_category_t ndpi_get_proto_category(struct ndpi_detection_module_struct *ndpi_mod, ndpi_protocol proto);
/**
* Get the protocol name associated to the ID
*
* @par mod = the detection module
* @par proto_id = the ID of the protocol
* @return the buffer contains the master_protocol and protocol name
*
*/
char* ndpi_get_proto_name(struct ndpi_detection_module_struct *mod, u_int16_t proto_id);
/**
* Return the protocol breed ID associated to the protocol
*
* @par ndpi_struct = the detection module
* @par proto = the ID of the protocol
* @return the breed ID associated to the protocol
*
*/
ndpi_protocol_breed_t ndpi_get_proto_breed(struct ndpi_detection_module_struct *ndpi_struct, u_int16_t proto);
/**
* Return the string name of the protocol breed
*
* @par ndpi_struct = the detection module
* @par breed_id = the breed ID associated to the protocol
* @return the string name of the breed ID
*
*/
char* ndpi_get_proto_breed_name(struct ndpi_detection_module_struct *ndpi_struct, ndpi_protocol_breed_t breed_id);
/**
* Return the ID of the protocol
*
* @par ndpi_mod = the detection module
* @par proto = the ID of the protocol
* @return the string name of the breed ID
*
*/
int ndpi_get_protocol_id(struct ndpi_detection_module_struct *ndpi_mod, char *proto);
/**
* Write the list of the supported protocols
*
* @par ndpi_mod = the detection module
*/
void ndpi_dump_protocols(struct ndpi_detection_module_struct *mod);
/**
* Read a file and load the protocols
*
* Format: <tcp|udp>:<port>,<tcp|udp>:<port>,.....@<proto>
*
* Example:
* tcp:80,tcp:3128@HTTP
* udp:139@NETBIOS
*
* @par ndpi_mod = the detection module
* @par path = the path of the file
* @return 0 if the file is loaded correctly;
* -1 else
*
*/
int ndpi_load_protocols_file(struct ndpi_detection_module_struct *ndpi_mod, char* path);
/**
* Get the total number of the supported protocols
*
* @par ndpi_mod = the detection module
* @return the number of protocols
*
*/
u_int ndpi_get_num_supported_protocols(struct ndpi_detection_module_struct *ndpi_mod);
/**
* Get the nDPI version release
*
* @return the NDPI_GIT_RELEASE
*
*/
char* ndpi_revision(void);
/**
* Set the automa for the protocol search
*
* @par ndpi_struct = the detection module
* @par automa = the automa to match
*
*/
void ndpi_set_automa(struct ndpi_detection_module_struct *ndpi_struct, void* automa);
#ifdef NDPI_PROTOCOL_HTTP
/**
* Retrieve information for HTTP flows
*
* @par ndpi_mod = the detection module
* @par flow = the detected flow
* @return the HTTP method information about the flow
*
*/
ndpi_http_method ndpi_get_http_method(struct ndpi_detection_module_struct *ndpi_mod, struct ndpi_flow_struct *flow);
/**
* Get the HTTP url
*
* @par ndpi_mod = the detection module
* @par flow = the detected flow
* @return the HTTP method information about the flow
*
*/
char* ndpi_get_http_url(struct ndpi_detection_module_struct *ndpi_mod, struct ndpi_flow_struct *flow);
/**
* Get the HTTP content-type
*
* @par ndpi_mod = the detection module
* @par flow = the detected flow
* @return the HTTP method information about the flow
*
*/
char* ndpi_get_http_content_type(struct ndpi_detection_module_struct *ndpi_mod, struct ndpi_flow_struct *flow);
#endif
#ifdef NDPI_PROTOCOL_TOR
/**
* Check if the flow could be detected as TOR protocol
*
* @par ndpi_struct = the detection module
* @par flow = the detected flow
* @par certificate = the ssl certificate
* @return 1 if the flow is TOR;
* 0 else
*
*/
int ndpi_is_ssl_tor(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow, char *certificate);
#endif
/* Wrappers functions */
/**
* Init Aho-Corasick automata
*
* @return The requested automata, or NULL if an error occurred
*
*/
void* ndpi_init_automa(void);
/**
* Free Aho-Corasick automata allocated with ndpi_init_automa();
*
* @par The automata initialized with ndpi_init_automa();
*
*/
void ndpi_free_automa(void *_automa);
/**
* Add a string to match to an automata
*
* @par The automata initialized with ndpi_init_automa();
* @par The (sub)string to search
* @par The number associated with this string
* @return 0 in case of no error, or -1 if an error occurred.
*
*/
int ndpi_add_string_value_to_automa(void *_automa, char *str, unsigned long num);
/**
* Add a string to match to an automata. Same as ndpi_add_string_value_to_automa() with num set to 1
*
* @par The automata initialized with ndpi_init_automa();
* @par The (sub)string to search
* @return 0 in case of no error, or -1 if an error occurred.
*
*/
int ndpi_add_string_to_automa(void *_automa, char *str);
/**
* Finalize the automa (necessary before start searching)
*
* @par The automata initialized with ndpi_init_automa();
*
*/
void ndpi_finalize_automa(void *_automa);
/**
* Add a string to match to an automata
*
* @par The automata initialized with ndpi_init_automa();
* @par The (sub)string to search
* @return 0 in case of match, or -1 if no match, or -2 if an error occurred.
*
*/
int ndpi_match_string(void *_automa, char *string_to_match);
/**
* Add a string to match to an automata
*
* @par The automata initialized with ndpi_init_automa();
* @par The (sub)string to search
* @par The id associated with the matched string or 0 id not found.
* @return 0 in case of match, or -1 if no match, or -2 if an error occurred.
*
*/
int ndpi_match_string_id(void *_automa, char *string_to_match, unsigned long *id);
/* Utility functions to set ndpi malloc/free/print wrappers */
void set_ndpi_malloc(void* (*__ndpi_malloc)(size_t size));
void set_ndpi_free(void (*__ndpi_free)(void *ptr));
void set_ndpi_flow_malloc(void* (*__ndpi_flow_malloc)(size_t size));
void set_ndpi_flow_free(void (*__ndpi_flow_free)(void *ptr));
void set_ndpi_debug_function(struct ndpi_detection_module_struct *ndpi_str, ndpi_debug_function_ptr ndpi_debug_printf);
#ifdef __cplusplus
}
#endif
#endif /* __NDPI_API_H__ */
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