socket.h File Reference

#include <freeradius-devel/build.h>
#include <freeradius-devel/missing.h>
#include <freeradius-devel/util/inet.h>
#include <freeradius-devel/util/time.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <sys/time.h>

Include dependency graph for socket.h:

Go to the source code of this file.

Data Structures
struct	fr_socket_t
	Holds information necessary for binding or connecting to a socket. More...
union	fr_socket_t.__unnamed148__
struct	fr_socket_t.__unnamed148__.inet
struct	fr_socket_t.__unnamed148__.unix

Macros
#define	FR_SOCKET_ADDR_ALLOC_DEF_FUNC(_func, ...)

Functions
static fr_socket_t *	fr_socket_addr_alloc_inet (TALLOC_CTX *ctx, int proto, int ifindex, fr_ipaddr_t const *src_ipaddr, int src_port, fr_ipaddr_t const *dst_ipaddr, int dst_port)
	Initialise a fr_socket_t for connecting to a remote host using a specific src interface, address and port.
static fr_socket_t *	fr_socket_addr_alloc_inet_dst (TALLOC_CTX *ctx, int proto, fr_ipaddr_t const *ipaddr, int port)
	A variant of fr_socket_addr_alloc_inet_dst that will also allocates a fr_socket_t.
static fr_socket_t *	fr_socket_addr_alloc_inet_src (TALLOC_CTX *ctx, int proto, int ifindex, fr_ipaddr_t const *ipaddr, int port)
	A variant of fr_socket_addr_init_inet_src will also allocates a fr_socket_t.
static fr_socket_t *	fr_socket_addr_init_inet (fr_socket_t *addr, int proto, int ifindex, fr_ipaddr_t const *src_ipaddr, int src_port, fr_ipaddr_t const *dst_ipaddr, int dst_port)
	Initialise a fr_socket_t for connecting to a remote host using a specific src interface, address and port.
static fr_socket_t *	fr_socket_addr_init_inet_dst (fr_socket_t *addr, int proto, fr_ipaddr_t const *ipaddr, int port)
	Initialise a fr_socket_t for connecting to a remote host.
static fr_socket_t *	fr_socket_addr_init_inet_src (fr_socket_t *addr, int proto, int ifindex, fr_ipaddr_t const *ipaddr, int port)
	A variant of fr_socket_addr_alloc_inet will also allocates a fr_socket_t.
static void	fr_socket_addr_swap (fr_socket_t *dst, fr_socket_t const *src)
	Swap src/dst information of a fr_socket_t.
int	fr_socket_bind (int sockfd, char const *ifname, fr_ipaddr_t *src_ipaddr, uint16_t *src_port)
	Bind a UDP/TCP v4/v6 socket to a given ipaddr src port, and interface.
int	fr_socket_client_tcp (char const *ifname, fr_ipaddr_t *src_ipaddr, fr_ipaddr_t const *dst_ipaddr, uint16_t dst_port, bool async)
	Establish a connected TCP socket.
int	fr_socket_client_udp (char const *ifname, fr_ipaddr_t *src_ipaddr, uint16_t *src_port, fr_ipaddr_t const *dst_ipaddr, uint16_t dst_port, bool async)
	Establish a connected UDP socket.
int	fr_socket_client_unix (char const *path, bool async)
static bool	fr_socket_proto_is_known (int proto)
	Check the proto value is sane/supported.
int	fr_socket_server_tcp (fr_ipaddr_t const *ipaddr, uint16_t *port, char const *port_name, bool async)
	Open an IPv4/IPv6 TCP socket.
int	fr_socket_server_udp (fr_ipaddr_t const *ipaddr, uint16_t *port, char const *port_name, bool async)
	Open an IPv4/IPv6 unconnected UDP socket.
int	fr_socket_wait_for_connect (int sockfd, fr_time_delta_t timeout)
	Wait for a socket to be connected, with an optional timeout.

---

Data Structure Documentation

fr_socket_t

struct fr_socket_t

Holds information necessary for binding or connecting to a socket.

May also be used in protocol contexts to store information necessary for returning packets to their originators.

Definition at line 63 of file socket.h.

Data Fields
union fr_socket_t.__unnamed148__	__unnamed__
int	af	AF_INET, AF_INET6, or AF_UNIX.
int	fd	File descriptor if this is a live socket.
int	type	SOCK_STREAM, SOCK_DGRAM, etc.

fr_socket_t.__unnamed148__

union fr_socket_t.__unnamed148__

Definition at line 64 of file socket.h.

Data Fields
struct fr_socket_t.__unnamed148__.inet	inet
struct fr_socket_t.__unnamed148__.unix	unix

fr_socket_t.__unnamed148__.inet

struct fr_socket_t.__unnamed148__.inet

Definition at line 65 of file socket.h.

Data Fields
fr_ipaddr_t	dst_ipaddr	IP address to connect to, or send the packet to.
uint16_t	dst_port	Port to connect to or send the packet to.
int	ifindex	Source interface to bind to or originate the packet from.
fr_ipaddr_t	src_ipaddr	IP address to bind to, or originate the packet from.
uint16_t	src_port	Port to bind to, or originate the packet from.

fr_socket_t.__unnamed148__.unix

struct fr_socket_t.__unnamed148__.unix

Definition at line 74 of file socket.h.

Data Fields
char const *	path	Unix socket path.

Macro Definition Documentation

FR_SOCKET_ADDR_ALLOC_DEF_FUNC

#define FR_SOCKET_ADDR_ALLOC_DEF_FUNC	(		_func,
			...
	)

Value:

        fr_socket_t *addr; \
        addr = talloc(ctx, fr_socket_t); \
        if (unlikely(!addr)) return NULL; \
        return _func(addr, ##__VA_ARGS__);

Definition at line 110 of file socket.h.

Function Documentation

fr_socket_addr_alloc_inet()

static fr_socket_t * fr_socket_addr_alloc_inet ( TALLOC_CTX *  ctx, int  proto, int  ifindex, fr_ipaddr_t const *  src_ipaddr, int  src_port, fr_ipaddr_t const *  dst_ipaddr, int  dst_port  )

inlinestatic

Initialise a fr_socket_t for connecting to a remote host using a specific src interface, address and port.

Can also be used to record information from an incoming packet so that we can identify the correct return path later.

Parameters

[in]	ctx	to allocate a new fr_socket_t struct in.
[in]	proto	one of the IPPROTO_* macros, i.e. IPPROTO_TCP, IPPROTO_UDP
[in]	ifindex	The interface to originate the packet from Pass <= 0 to indicate an unknown or unspecified interface.
[in]	src_ipaddr	The source IP address of the packet, or source interface for packets to egress out of.
[in]	src_port	The source port of the packet or the source
[in]	dst_ipaddr	The destination IP address of the packet.
[in]	dst_port	The destination port of the packet.

Returns

• NULL if invalid parameters are provided.
• An initialised fr_socket_t struct.

Definition at line 191 of file socket.h.

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fr_socket_addr_alloc_inet_dst()

static fr_socket_t * fr_socket_addr_alloc_inet_dst ( TALLOC_CTX *  ctx, int  proto, fr_ipaddr_t const *  ipaddr, int  port  )

inlinestatic

A variant of fr_socket_addr_alloc_inet_dst that will also allocates a fr_socket_t.

Parameters

[in]	ctx	to allocate new fr_socket_t struct in.
[in]	proto	one of the IPPROTO_* macros, i.e. IPPROTO_TCP, IPPROTO_UDP
[in]	ipaddr	The IP address to bind to. May be all zeros to bind to all addresses, but the AF must still be specified.
[in]	port	The source port to bind to.

Returns

• NULL if invalid parameters are provided.
• An initialised fr_socket_t struct.

Definition at line 287 of file socket.h.

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fr_socket_addr_alloc_inet_src()

static fr_socket_t * fr_socket_addr_alloc_inet_src ( TALLOC_CTX *  ctx, int  proto, int  ifindex, fr_ipaddr_t const *  ipaddr, int  port  )

inlinestatic

A variant of fr_socket_addr_init_inet_src will also allocates a fr_socket_t.

Parameters

[in]	ctx	to allocate a new fr_socket_t struct in.
[in]	proto	one of the IPPROTO_* macros, i.e. IPPROTO_TCP, IPPROTO_UDP
[in]	ifindex	The interface to originate the packet from Pass <= 0 to indicate an unknown or unspecified interface.
[in]	ipaddr	The IP address to bind to. May be all zeros to bind to all addresses, but the AF must still be specified.
[in]	port	The source port to bind to.

Returns

• NULL if invalid parameters are provided.
• An initialised fr_socket_t struct.

Definition at line 244 of file socket.h.

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fr_socket_addr_init_inet()

static fr_socket_t * fr_socket_addr_init_inet ( fr_socket_t *  addr, int  proto, int  ifindex, fr_ipaddr_t const *  src_ipaddr, int  src_port, fr_ipaddr_t const *  dst_ipaddr, int  dst_port  )

inlinestatic

Initialise a fr_socket_t for connecting to a remote host using a specific src interface, address and port.

Can also be used to record information from an incoming packet so that we can identify the correct return path later.

Parameters

[out]	addr	to initialise.
[in]	proto	one of the IPPROTO_* macros, i.e. IPPROTO_TCP, IPPROTO_UDP
[in]	ifindex	The interface to originate the packet from Pass <= 0 to indicate an unknown or unspecified interface.
[in]	src_ipaddr	The source IP address of the packet, or source interface for packets to egress out of.
[in]	src_port	The source port of the packet or the source
[in]	dst_ipaddr	The destination IP address of the packet.
[in]	dst_port	The destination port of the packet.

Returns

• NULL if invalid parameters are provided.
• An initialised fr_socket_t struct.

Definition at line 151 of file socket.h.

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fr_socket_addr_init_inet_dst()

static fr_socket_t * fr_socket_addr_init_inet_dst ( fr_socket_t *  addr, int  proto, fr_ipaddr_t const *  ipaddr, int  port  )

inlinestatic

Initialise a fr_socket_t for connecting to a remote host.

Parameters

[out]	addr	to initialise.
[in]	proto	one of the IPPROTO_* macros, i.e. IPPROTO_TCP, IPPROTO_UDP
[in]	ipaddr	The IP address to bind to. May be all zeros to bind to all addresses, but the AF must still be specified.
[in]	port	The source port to bind to.

Returns

• NULL if invalid parameters are provided.
• An initialised fr_socket_t struct.

Definition at line 260 of file socket.h.

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fr_socket_addr_init_inet_src()

static fr_socket_t * fr_socket_addr_init_inet_src ( fr_socket_t *  addr, int  proto, int  ifindex, fr_ipaddr_t const *  ipaddr, int  port  )

inlinestatic

A variant of fr_socket_addr_alloc_inet will also allocates a fr_socket_t.

Parameters

[out]	addr	to initialise.
[in]	proto	one of the IPPROTO_* macros, i.e. IPPROTO_TCP, IPPROTO_UDP
[in]	ifindex	The interface to originate the packet from Pass <= 0 to indicate an unknown or unspecified interface.
[in]	ipaddr	The IP address to bind to. May be all zeros to bind to all addresses, but the AF must still be specified.
[in]	port	The source port to bind to.

Returns

• NULL if invalid parameters are provided.
• An initialised fr_socket_t struct.

Definition at line 213 of file socket.h.

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fr_socket_addr_swap()

static void fr_socket_addr_swap ( fr_socket_t *  dst, fr_socket_t const *  src  )

inlinestatic

Swap src/dst information of a fr_socket_t.

Parameters

[out]	dst	Where to write the swapped addresses. May be the same as src.
[in]	src	Socket address to swap.

Definition at line 121 of file socket.h.

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fr_socket_bind()

int fr_socket_bind	(	int	sockfd,
		char const *	ifname,
		fr_ipaddr_t *	src_ipaddr,
		uint16_t *	src_port
	)

Bind a UDP/TCP v4/v6 socket to a given ipaddr src port, and interface.

Use one of:

• fr_socket_server_udp - for non-connected socket.
• fr_socket_server_tcp ...to open a file descriptor, then call this function to bind the socket to an IP address.

Parameters

[in]	sockfd	the socket which opened by fr_socket_server_*.
[in]	ifname	to bind to.
[in,out]	src_ipaddr	The IP address to bind to. Will be updated to the IP address that was actually bound to. Pass NULL to just bind to an interface.
[in]	src_port	the port to bind to. NULL if any port is allowed.

Returns

• 0 on success
• -1 on failure.

Definition at line 229 of file socket.c.

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fr_socket_client_tcp()

int fr_socket_client_tcp	(	char const *	ifname,
		fr_ipaddr_t *	src_ipaddr,
		fr_ipaddr_t const *	dst_ipaddr,
		uint16_t	dst_port,
		bool	async
	)

Establish a connected TCP socket.

The following code demonstrates using this function with a connection timeout:

sockfd = fr_socket_client_tcp(NULL, NULL, ipaddr, port, true);
if (sockfd < 0) {
      fr_perror();
      fr_exit_now(1);
}
if ((errno == EINPROGRESS) && (fr_socket_wait_for_connect(sockfd, timeout) < 0)) {
error:
      fr_perror();
      close(sockfd);
      goto error;
}
//Optionally, if blocking operation is required
if (fr_blocking(sockfd) < 0) goto error;

Parameters

[in]	ifname	If non-NULL, bind the socket to this interface.
	src_ipaddr	to bind socket to, may be NULL if socket is not bound to any specific address.
	dst_ipaddr	Where to connect to.
	dst_port	Where to connect to.
	async	Whether to set the socket to nonblocking, allowing use of fr_socket_wait_for_connect.

Returns

• FD on success
• -1 on failure.

Definition at line 729 of file socket.c.

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fr_socket_client_udp()

int fr_socket_client_udp	(	char const *	ifname,
		fr_ipaddr_t *	src_ipaddr,
		uint16_t *	src_port,
		fr_ipaddr_t const *	dst_ipaddr,
		uint16_t	dst_port,
		bool	async
	)

Establish a connected UDP socket.

Connected UDP sockets can be used with write(), unlike unconnected sockets which must be used with sendto and recvfrom.

The following code demonstrates using this function with a connection timeout:

sockfd = fr_socket_client_udp(NULL, NULL, NULL, ipaddr, port, true);
if (sockfd < 0) {
      fr_perror();
      fr_exit_now(1);
}
if ((errno == EINPROGRESS) && (fr_socket_wait_for_connect(sockfd, timeout) < 0)) {
error:
      fr_perror();
      close(sockfd);
      goto error;
}
//Optionally, if blocking operation is required
if (fr_blocking(sockfd) < 0) goto error;

Parameters

[in]	ifname	If non-NULL, bind the socket to this interface.
[in,out]	src_ipaddr	to bind socket to, may be NULL if socket is not bound to any specific address. If non-null, the bound IP is copied here, too.
[out]	src_port	The source port we were bound to, may be NULL.
[in]	dst_ipaddr	Where to send datagrams.
[in]	dst_port	Where to send datagrams.
[in]	async	Whether to set the socket to nonblocking, allowing use of fr_socket_wait_for_connect.

Returns

• FD on success.
• -1 on failure.

Definition at line 634 of file socket.c.

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fr_socket_client_unix()

int fr_socket_client_unix	(	char const *	path,
		bool	async
	)

fr_socket_proto_is_known()

static bool fr_socket_proto_is_known ( int  proto )

inlinestatic

Check the proto value is sane/supported.

Parameters

[in]

proto

to check

Returns

• true if it is.
• false if it's not.

Definition at line 91 of file socket.h.

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fr_socket_server_tcp()

int fr_socket_server_tcp	(	fr_ipaddr_t const *	src_ipaddr,
		uint16_t *	src_port,
		char const *	port_name,
		bool	async
	)

Open an IPv4/IPv6 TCP socket.

Parameters

[in]	src_ipaddr	The IP address to listen on
[in,out]	src_port	the port to listen on. If *port == 0, the resolved service port will be written here. NULL if any port is allowed.
[in]	port_name	if *port == 0, the name of the port
[in]	async	whether we block or not on reads and writes

Returns

• Socket FD on success.
• -1 on failure.

Definition at line 969 of file socket.c.

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fr_socket_server_udp()

int fr_socket_server_udp	(	fr_ipaddr_t const *	src_ipaddr,
		uint16_t *	src_port,
		char const *	port_name,
		bool	async
	)

Open an IPv4/IPv6 unconnected UDP socket.

Function name is a bit of a misnomer as it can also be used to create client sockets too, such is the nature of UDP.

Parameters

[in]	src_ipaddr	The IP address to listen on
[in,out]	src_port	the port to listen on. If *port == 0, the resolved service port will be written here.
[in]	port_name	if *port == 0, the name of the port
[in]	async	whether we block or not on reads and writes

Returns

• Socket FD on success.
• -1 on failure.

Definition at line 867 of file socket.c.

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fr_socket_wait_for_connect()

int fr_socket_wait_for_connect	(	int	sockfd,
		fr_time_delta_t	timeout
	)

Wait for a socket to be connected, with an optional timeout.

Note

On error the caller is expected to close(sockfd).

Parameters

sockfd	the socket to wait on.
timeout	How long to wait for socket to open.

Returns

• 0 on success.
• -1 on connection error.
• -2 on timeout.
• -3 on select error.

Definition at line 803 of file socket.c.

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