proto_dhcpv4_udp.c File Reference

DHCPv4 handler for UDP. More...

#include <netdb.h>
#include <freeradius-devel/arp/arp.h>
#include <freeradius-devel/server/protocol.h>
#include <freeradius-devel/util/udp.h>
#include <freeradius-devel/util/trie.h>
#include <freeradius-devel/io/application.h>
#include <freeradius-devel/io/listen.h>
#include <freeradius-devel/io/schedule.h>
#include <freeradius-devel/protocol/dhcpv4/freeradius.internal.h>
#include <freeradius-devel/util/pcap.h>
#include "proto_dhcpv4.h"

Include dependency graph for proto_dhcpv4_udp.c:

Go to the source code of this file.

Data Structures
struct	proto_dhcpv4_udp_t
struct	proto_dhcpv4_udp_thread_t

Macros
#define	LOG_PREFIX   "proto_dhcpv4_udp"

Functions
static fr_client_t *	mod_client_find (fr_listen_t *li, fr_ipaddr_t const *ipaddr, int ipproto)
static int	mod_connection_set (fr_listen_t *li, fr_io_address_t *connection)
static int	mod_fd_set (fr_listen_t *li, int fd)
	Set the file descriptor for this socket.
static int	mod_instantiate (module_inst_ctx_t const *mctx)
static char const *	mod_name (fr_listen_t *li)
static void	mod_network_get (int *ipproto, bool *dynamic_clients, fr_trie_t const **trie, void *instance)
static int	mod_open (fr_listen_t *li)
	Open a UDP listener for DHCPV4.
static ssize_t	mod_read (fr_listen_t *li, void **packet_ctx, fr_time_t *recv_time_p, uint8_t *buffer, size_t buffer_len, size_t *leftover)
static int	mod_track_compare (UNUSED void const *instance, UNUSED void *thread_instance, UNUSED fr_client_t *client, void const *one, void const *two)
static void *	mod_track_create (UNUSED void const *instance, UNUSED void *thread_instance, UNUSED fr_client_t *client, fr_io_track_t *track, uint8_t const *packet, size_t packet_len)
static ssize_t	mod_write (fr_listen_t *li, void *packet_ctx, UNUSED fr_time_t request_time, uint8_t *buffer, size_t buffer_len, UNUSED size_t written)

Variables
static fr_dict_attr_t const *	attr_dhcp_server_identifier
static fr_dict_attr_t const *	attr_message_type
static fr_dict_t const *	dict_dhcpv4
static const conf_parser_t	networks_config []
fr_app_io_t	proto_dhcpv4_udp
fr_dict_autoload_t	proto_dhcpv4_udp_dict []
fr_dict_attr_autoload_t	proto_dhcpv4_udp_dict_attr []
static const conf_parser_t	udp_listen_config []

Detailed Description

DHCPv4 handler for UDP.

Id

a30a5a1ed265b03133f0d54ee1751a30fea7cb2c

Copyright

2018 The FreeRADIUS server project.

2018 Alan DeKok (aland.nosp@m.@dep.nosp@m.loyin.nosp@m.grad.nosp@m.ius.c.nosp@m.om)

Definition in file proto_dhcpv4_udp.c.

---

Data Structure Documentation

proto_dhcpv4_udp_t

struct proto_dhcpv4_udp_t

Definition at line 62 of file proto_dhcpv4_udp.c.

Collaboration diagram for proto_dhcpv4_udp_t:

Data Fields
fr_ipaddr_t *	allow	allowed networks for dynamic clients
bool	broadcast	whether we listen for broadcast packets
uint16_t	client_port	Client port to reply to.
fr_client_list_t *	clients	local clients
CONF_SECTION *	cs	our configuration
fr_client_t *	default_client	default 0/0 client
fr_ipaddr_t *	deny	denied networks for dynamic clients
bool	dynamic_clients	whether we have dynamic clients
char const *	interface	Interface to bind to.
fr_ipaddr_t	ipaddr	IP address to listen on.
uint32_t	max_attributes	Limit maximum decodable attributes.
uint32_t	max_packet_size	for message ring buffer.
uint16_t	port	Port to listen on.
char const *	port_name	Name of the port for getservent().
uint32_t	recv_buff	How big the kernel's receive buffer should be.
bool	recv_buff_is_set	Whether we were provided with a receive buffer value.
fr_ipaddr_t	src_ipaddr	IP address to source replies.
fr_trie_t *	trie	for parsed networks

proto_dhcpv4_udp_thread_t

struct proto_dhcpv4_udp_thread_t

Definition at line 49 of file proto_dhcpv4_udp.c.

Collaboration diagram for proto_dhcpv4_udp_thread_t:

Data Fields
fr_io_address_t *	connection	for connected sockets.
char const *	name	socket name
int	sockfd
fr_stats_t	stats	statistics for this socket

Macro Definition Documentation

LOG_PREFIX

#define LOG_PREFIX   "proto_dhcpv4_udp"

Definition at line 25 of file proto_dhcpv4_udp.c.

Function Documentation

mod_client_find()

static fr_client_t * mod_client_find ( fr_listen_t *  li, fr_ipaddr_t const *  ipaddr, int  ipproto  )

static

Definition at line 984 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

mod_connection_set()

static int mod_connection_set ( fr_listen_t *  li, fr_io_address_t *  connection  )

static

Definition at line 640 of file proto_dhcpv4_udp.c.

mod_fd_set()

static int mod_fd_set ( fr_listen_t *  li, int  fd  )

static

Set the file descriptor for this socket.

Definition at line 757 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

mod_instantiate()

static int mod_instantiate ( module_inst_ctx_t const *  mctx )

static

Definition at line 850 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

mod_name()

static char const * mod_name ( fr_listen_t *  li )

static

Definition at line 842 of file proto_dhcpv4_udp.c.

mod_network_get()

static void mod_network_get ( int *  ipproto, bool *  dynamic_clients, fr_trie_t const **  trie, void *  instance  )

static

Definition at line 649 of file proto_dhcpv4_udp.c.

mod_open()

static int mod_open ( fr_listen_t *  li )

static

Open a UDP listener for DHCPV4.

Definition at line 662 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

mod_read()

static ssize_t mod_read ( fr_listen_t *  li, void **  packet_ctx, fr_time_t *  recv_time_p, uint8_t *  buffer, size_t  buffer_len, size_t *  leftover  )

static

Definition at line 207 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

mod_track_compare()

static int mod_track_compare ( UNUSED void const *  instance, UNUSED void *  thread_instance, UNUSED fr_client_t *  client, void const *  one, void const *  two  )

static

Definition at line 813 of file proto_dhcpv4_udp.c.

mod_track_create()

static void * mod_track_create ( UNUSED void const *  instance, UNUSED void *  thread_instance, UNUSED fr_client_t *  client, fr_io_track_t *  track, uint8_t const *  packet, size_t  packet_len  )

static

Definition at line 774 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

mod_write()

static ssize_t mod_write ( fr_listen_t *  li, void *  packet_ctx, UNUSED fr_time_t  request_time, uint8_t *  buffer, size_t  buffer_len, UNUSED size_t  written  )

static

Definition at line 282 of file proto_dhcpv4_udp.c.

Here is the call graph for this function:

Variable Documentation

attr_dhcp_server_identifier

fr_dict_attr_t const* attr_dhcp_server_identifier

static

Definition at line 143 of file proto_dhcpv4_udp.c.

attr_message_type

fr_dict_attr_t const* attr_message_type

static

Definition at line 142 of file proto_dhcpv4_udp.c.

dict_dhcpv4

fr_dict_t const* dict_dhcpv4

static

Definition at line 134 of file proto_dhcpv4_udp.c.

networks_config

const conf_parser_t networks_config[]

static

Initial value:

= {
        { FR_CONF_OFFSET_TYPE_FLAGS("allow", FR_TYPE_COMBO_IP_PREFIX , CONF_FLAG_MULTI, proto_dhcpv4_udp_t, allow) },
        { FR_CONF_OFFSET_TYPE_FLAGS("deny", FR_TYPE_COMBO_IP_PREFIX , CONF_FLAG_MULTI, proto_dhcpv4_udp_t, deny) },
 
        CONF_PARSER_TERMINATOR
}

Definition at line 99 of file proto_dhcpv4_udp.c.

proto_dhcpv4_udp

fr_app_io_t proto_dhcpv4_udp

Initial value:

= {
        .common = {
                .magic                  = MODULE_MAGIC_INIT,
                .name                   = "dhcpv4_udp",
                .config                 = udp_listen_config,
                .inst_size              = sizeof(proto_dhcpv4_udp_t),
                .thread_inst_size       = sizeof(proto_dhcpv4_udp_thread_t),
                .instantiate            = mod_instantiate,
        },
        .default_message_size   = 4096,
        .track_duplicates       = true,
 
        .open                   = mod_open,
        .read                   = mod_read,
        .write                  = mod_write,
 
 
 
        .fd_set                 = mod_fd_set,
        .track_create           = mod_track_create,
        .track_compare          = mod_track_compare,
        .connection_set         = mod_connection_set,
        .network_get            = mod_network_get,
        .client_find            = mod_client_find,
        .get_name               = mod_name,
}

Definition at line 1001 of file proto_dhcpv4_udp.c.

proto_dhcpv4_udp_dict

fr_dict_autoload_t proto_dhcpv4_udp_dict

Initial value:

= {
        { .out = &dict_dhcpv4, .proto = "dhcpv4" },
        DICT_AUTOLOAD_TERMINATOR
}

Definition at line 137 of file proto_dhcpv4_udp.c.

proto_dhcpv4_udp_dict_attr

fr_dict_attr_autoload_t proto_dhcpv4_udp_dict_attr

Initial value:

= {
        { .out = &attr_message_type, .name = "Message-Type", .type = FR_TYPE_UINT8, .dict = &dict_dhcpv4},
        { .out = &attr_dhcp_server_identifier, .name = "Server-Identifier", .type = FR_TYPE_IPV4_ADDR, .dict = &dict_dhcpv4},
        DICT_AUTOLOAD_TERMINATOR
}

Definition at line 146 of file proto_dhcpv4_udp.c.

udp_listen_config

const conf_parser_t udp_listen_config[]

static

Initial value:

= {
        { FR_CONF_OFFSET_TYPE_FLAGS("ipaddr", FR_TYPE_IPV4_ADDR, 0, proto_dhcpv4_udp_t, ipaddr) },
        { FR_CONF_OFFSET_TYPE_FLAGS("ipv4addr", FR_TYPE_IPV4_ADDR, 0, proto_dhcpv4_udp_t, ipaddr) },
 
        { FR_CONF_OFFSET_TYPE_FLAGS("src_ipaddr", FR_TYPE_COMBO_IP_ADDR, 0, proto_dhcpv4_udp_t, src_ipaddr) },
 
        { FR_CONF_OFFSET("interface", proto_dhcpv4_udp_t, interface) },
        { FR_CONF_OFFSET("port_name", proto_dhcpv4_udp_t, port_name) },
 
        { FR_CONF_OFFSET("port", proto_dhcpv4_udp_t, port) },
        { FR_CONF_OFFSET("client_port", proto_dhcpv4_udp_t, client_port) },
        { FR_CONF_OFFSET_IS_SET("recv_buff", FR_TYPE_UINT32, 0, proto_dhcpv4_udp_t, recv_buff) },
 
        { FR_CONF_OFFSET("broadcast", proto_dhcpv4_udp_t, broadcast) } ,
 
        { FR_CONF_OFFSET("dynamic_clients", proto_dhcpv4_udp_t, dynamic_clients) } ,
        { FR_CONF_POINTER("networks", 0, CONF_FLAG_SUBSECTION, NULL), .subcs = (void const *) networks_config },
 
        { FR_CONF_OFFSET("max_packet_size", proto_dhcpv4_udp_t, max_packet_size), .dflt = "4096" } ,
        { FR_CONF_OFFSET("max_attributes", proto_dhcpv4_udp_t, max_attributes), .dflt = STRINGIFY(DHCPV4_MAX_ATTRIBUTES) } ,
 
 
 
 
        CONF_PARSER_TERMINATOR
}

Definition at line 107 of file proto_dhcpv4_udp.c.