IP address related utility functions. More...
#include <errno.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <string.h>
#include "ip-utils.h"
Functions | |
const struct ifaddrs * | janus_query_network_devices (const struct ifaddrs *ifa, const janus_network_query_config *query) |
Look up network devices matching the given query. The first matching device is returned, so to find all matching devices simply pass the ifa_next of the returned device in a subsequent call to this function to find more matches. More... | |
int | janus_prepare_network_device_query (const char *user_value, const janus_ip_network_query_options query_mode, janus_network_query_config *query) |
Initialise a network device query. More... | |
int | janus_prepare_network_device_query_default (const char *user_value, janus_network_query_config *query) |
Initialise a network device query with default query options. This function will Initialise the query to accept any supported match type. More... | |
int | janus_get_network_devices_ipv4 (const struct ifaddrs *ifa, const janus_network_query_config *query, struct in_addr *result) |
Copies the IPv4 address from a network inteface description to the given result structure. More... | |
int | janus_get_network_devices_ipv6 (const struct ifaddrs *ifa, const janus_network_query_config *query, struct in6_addr *result) |
Copies the IPv6 address from a network inteface description to the given result structure. More... | |
int | janus_get_network_device_address (const struct ifaddrs *ifa, janus_network_address *result) |
Copies the IP address from a network interface description to the given result structure. More... | |
void | janus_network_address_nullify (janus_network_address *a) |
Set the given network address to a null/nil value. More... | |
int | janus_network_address_is_null (const janus_network_address *a) |
Test if a given network address is null-valued. More... | |
int | janus_network_address_to_string_buffer (const janus_network_address *a, janus_network_address_string_buffer *buf) |
Convert the given network address to a form which can be used to extract a human readable network address from. More... | |
void | janus_network_address_string_buffer_nullify (janus_network_address_string_buffer *b) |
Set the given network address string buffer to a null/nil value. More... | |
int | janus_network_address_string_buffer_is_null (const janus_network_address_string_buffer *b) |
Test if a given network address string buffer is null-valued. More... | |
const char * | janus_network_address_string_from_buffer (const janus_network_address_string_buffer *b) |
Extract the human readable representation of a network address from a given buffer. More... | |
IP address related utility functions.
Provides functions to query for network devices with a given device name or address. Devices may be looked up by either a device name or by the IPv4 or IPv6 address of the configured network interface. This functionality may be used to bind to user configurable network devices instead of relying on unpredictable implementation defined defaults. Parsing IPv4/IPv6 addresses is done using inet_pton(), making these functions generally robust against malformed input.
int janus_get_network_device_address | ( | const struct ifaddrs * | ifa, |
janus_network_address * | result | ||
) |
Copies the IP address from a network interface description to the given result structure.
janus_network_address
int janus_get_network_devices_ipv4 | ( | const struct ifaddrs * | ifa, |
const janus_network_query_config * | query, | ||
struct in_addr * | result | ||
) |
Copies the IPv4 address from a network inteface description to the given result structure.
ifa | The network interface description to grab the IPv4 address from. It should be obtained with janus_query_network_devices() . |
result | Pointer to a structure to populate with the IPv4 address of the given network interface |
janus_query_network_devices
int janus_get_network_devices_ipv6 | ( | const struct ifaddrs * | ifa, |
const janus_network_query_config * | query, | ||
struct in6_addr * | result | ||
) |
Copies the IPv6 address from a network inteface description to the given result structure.
ifa | The network interface description to grab the IPv6 address from. It should be obtained with janus_query_network_devices() . |
result | Pointer to a structure to populate with the IPv6 address of the given network interface |
janus_query_network_devices
int janus_network_address_is_null | ( | const janus_network_address * | a | ) |
Test if a given network address is null-valued.
a | The address to check |
janus_network_address_nullify
void janus_network_address_nullify | ( | janus_network_address * | a | ) |
Set the given network address to a null/nil value.
a | The address to nullify. Nothing is done if the pointer is NULL itself. |
janus_network_address_is_null
int janus_network_address_string_buffer_is_null | ( | const janus_network_address_string_buffer * | b | ) |
Test if a given network address string buffer is null-valued.
b | The buffer to check |
void janus_network_address_string_buffer_nullify | ( | janus_network_address_string_buffer * | b | ) |
Set the given network address string buffer to a null/nil value.
b | The address to nullify. Nothing is done if the pointer is NULL itself. |
const char* janus_network_address_string_from_buffer | ( | const janus_network_address_string_buffer * | b | ) |
Extract the human readable representation of a network address from a given buffer.
b | The buffer containing the given network |
int janus_network_address_to_string_buffer | ( | const janus_network_address * | a, |
janus_network_address_string_buffer * | buf | ||
) |
Convert the given network address to a form which can be used to extract a human readable network address from.
a | The address to convert |
buf | A buffer to contain the human readable form. |
janus_network_address
janus_network_address_string_buffer
janus_network_address_string_from_buffer
int janus_prepare_network_device_query | ( | const char * | user_value, |
const janus_ip_network_query_options | query_mode, | ||
janus_network_query_config * | query | ||
) |
Initialise a network device query.
user_value | The user-supplied string which is supposed to describe either the device name or its IP address. |
query_mode | (A mask of) Options describing the supoorted types of matches which should be accepted when performing a look up with this query. This can be used to restrict the query to 'by device name' or 'IPv4 only' type searches. |
query | The query object to configure. |
janus_ip_network_query_options
int janus_prepare_network_device_query_default | ( | const char * | user_value, |
janus_network_query_config * | query | ||
) |
Initialise a network device query with default query options. This
function will Initialise the query to accept any supported match type.
user_value | The user-supplied string which is supposed to describe either the device name or its IP address. |
query | The query object to configure. |
const struct ifaddrs* janus_query_network_devices | ( | const struct ifaddrs * | ifas, |
const janus_network_query_config * | query | ||
) |
Look up network devices matching the given query. The first matching device is returned, so to find all matching devices simply pass the ifa_next
of the returned device in a subsequent call to this function to find more matches.
ifas | The first node of the list of network interfaces to search through. This should be obtained (indirectly) from getifaddrs() . |
query | A description of the criteria to look for when deteremining whether or not a network interface is a match. |
NULL
if no (further) match was found.