mdns_service.c File Reference

File containing the implementation of mDNS service structures. More...

#include <stdint.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <sys/ioctl.h>
#include <syslog.h>
#include <unistd.h>
#include <eloop.h>
#include <uthash.h>
#include "../capture/middlewares/header_middleware/mdns_decoder.h"
#include "../capture/middlewares/header_middleware/packet_queue.h"
#include "../capture/pcap_service.h"
#include "../supervisor/cmd_processor.h"
#include "../supervisor/supervisor_config.h"
#include "../utils/hashmap.h"
#include "../utils/iface_mapper.h"
#include "../utils/ifaceu.h"
#include "../utils/log.h"
#include "../utils/net.h"
#include "../utils/sockctl.h"
#include "../utils/squeue.h"
#include "mcast.h"
#include "mdns_service.h"

Include dependency graph for mdns_service.c:

Macros
#define	MDNS_PORT   5353
#define	MDNS_ADDR4   (uint32_t)0xE00000FB /* 224.0.0.251 */
#define	MDNS_ADDR6_INIT
#define	MDNS_PCAP_BUFFER_TIMEOUT   10

Functions
int	sockaddr2str (struct sockaddr_storage *sa, char *buffer, uint16_t *port)
void	close_reflector_if (struct reflection_list *rif)
int	forward_reflector_if6 (uint8_t *send_buf, size_t len, struct reflection_list *rif)
int	forward_reflector_if4 (uint8_t *send_buf, size_t len, struct reflection_list *rif)
void	eloop_reflector_handler (int sock, void *eloop_ctx, void *sock_ctx)
int	register_reflector_if6 (struct eloop_data *eloop, struct mdns_context *context)
int	register_reflector_if4 (struct eloop_data *eloop, struct mdns_context *context)
int	init_reflections (hmap_vlan_conn **vlan_mapper, struct mdns_context *context)
int	close_mdns (struct mdns_context *context)
	Closes mDNS service. More...
int	create_domain_command (char *src_ip, char *dst_ip, char **out)
int	send_bridge_command (struct mdns_context *context, struct tuple_packet *tp)
void	mdns_pcap_callback (const void *ctx, const void *pcap_ctx, char *ltype, struct pcap_pkthdr *header, uint8_t *packet)
void	eloop_read_mdns_fd_handler (int sock, void *eloop_ctx, void *sock_ctx)
int	run_mdns_capture (struct eloop_data *eloop, struct mdns_context *context)
int	run_mdns (struct mdns_context *context)
	Runs the mDNS forwarder service. More...
void	free_mdns_context (struct mdns_context *context)
int	init_mdns_context (struct mdns_conf *mdns_config, char *supervisor_control_path, hmap_vlan_conn *vlan_mapper, struct mdns_context *context)
void *	mdns_thread (void *arg)
int	run_mdns_thread (struct mdns_conf *mdns_config, char *supervisor_control_path, hmap_vlan_conn *vlan_mapper, pthread_t *id)
	Runs the mDNS forwarder service thread. More...

Detailed Description

File containing the implementation of mDNS service structures.

Author

Alexandru Mereacre

Date

2021

Copyright

SPDX-FileCopyrightText: © 2021 NQMCyber Ltd and edgesec contributors SPDX-License-Identifier: LGPL-3.0-or-later

Macro Definition Documentation

MDNS_ADDR4

#define MDNS_ADDR4   (uint32_t)0xE00000FB /* 224.0.0.251 */

MDNS_ADDR6_INIT

#define MDNS_ADDR6_INIT

Value:

  {                                                                            \
    {                                                                          \
      {                                                                        \
        0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,      \
            0x00, 0x00, 0x00, 0x00, 0xfb                                       \
      }                                                                        \
    }                                                                          \
  }

MDNS_PCAP_BUFFER_TIMEOUT

#define MDNS_PCAP_BUFFER_TIMEOUT   10

MDNS_PORT

#define MDNS_PORT   5353

Function Documentation

close_mdns()

int close_mdns

(

struct mdns_context *

context

)

Closes mDNS service.

Parameters

context

The mDNS context structure

Returns

0 on success, -1 on failure

close_reflector_if()

void close_reflector_if

(

struct reflection_list *

rif

)

create_domain_command()

int create_domain_command	(	char *	src_ip,
		char *	dst_ip,
		char **	out
	)

eloop_read_mdns_fd_handler()

void eloop_read_mdns_fd_handler	(	int	sock,
		void *	eloop_ctx,
		void *	sock_ctx
	)

eloop_reflector_handler()

void eloop_reflector_handler	(	int	sock,
		void *	eloop_ctx,
		void *	sock_ctx
	)

forward_reflector_if4()

int forward_reflector_if4	(	uint8_t *	send_buf,
		size_t	len,
		struct reflection_list *	rif
	)

forward_reflector_if6()

int forward_reflector_if6	(	uint8_t *	send_buf,
		size_t	len,
		struct reflection_list *	rif
	)

free_mdns_context()

void free_mdns_context

(

struct mdns_context *

context

)

init_mdns_context()

int init_mdns_context	(	struct mdns_conf *	mdns_config,
		char *	supervisor_control_path,
		hmap_vlan_conn *	vlan_mapper,
		struct mdns_context *	context
	)

init_reflections()

int init_reflections	(	hmap_vlan_conn **	vlan_mapper,
		struct mdns_context *	context
	)

mdns_pcap_callback()

void mdns_pcap_callback	(	const void *	ctx,
		const void *	pcap_ctx,
		char *	ltype,
		struct pcap_pkthdr *	header,
		uint8_t *	packet
	)

mdns_thread()

void* mdns_thread

(

void *

arg

)

register_reflector_if4()

int register_reflector_if4	(	struct eloop_data *	eloop,
		struct mdns_context *	context
	)

register_reflector_if6()

int register_reflector_if6	(	struct eloop_data *	eloop,
		struct mdns_context *	context
	)

run_mdns()

int run_mdns

(

struct mdns_context *

context

)

Runs the mDNS forwarder service.

Parameters

context

The mDNS context structure.

Returns

int 0 on success, -1 on failure

run_mdns_capture()

int run_mdns_capture	(	struct eloop_data *	eloop,
		struct mdns_context *	context
	)

run_mdns_thread()

int run_mdns_thread	(	struct mdns_conf *	mdns_config,
		char *	supervisor_control_path,
		hmap_vlan_conn *	vlan_mapper,
		pthread_t *	id
	)

Runs the mDNS forwarder service thread.

Parameters

mdns_config	The mDNS config structure
supervisor_control_path	The UNIX domain supervisor control path
vlan_mapper	The VLAN mapper object
id	The returned thread id

Returns

int 0 on success, -1 on failure

send_bridge_command()

int send_bridge_command	(	struct mdns_context *	context,
		struct tuple_packet *	tp
	)

sockaddr2str()

int sockaddr2str	(	struct sockaddr_storage *	sa,
		char *	buffer,
		uint16_t *	port
	)