Functions for reading or writing from network. More...

Collaboration diagram for Network functions:

Classes
struct	retry_addr

Functions
static size_t	read_and_convert (TDSSOCKET tds, TDSICONV char_conv, size_t wire_size, char outbuf, size_t outbytesleft)
	For UTF-8 and similar, tds_iconv() may encounter a partial sequence when the chunk boundary is not aligned with the character boundary.

int	tds7_get_instance_port (struct addrinfo addr, const char instance)
	Get port of given instance.

int	tds7_get_instance_ports (FILE output, struct addrinfo addr)
	Get port of all instances.

const char *	tds_addrinfo2str (struct addrinfo addr, char name, int namemax)

static void	tds_addrinfo_set_port (struct addrinfo *addr, unsigned int port)

void	tds_close_socket (TDSSOCKET *tds)
	Close current socket.

	TDS_COMPILE_CHECK (additional, TDS_ADDITIONAL_SPACE !=0)

void	tds_connection_close (TDSCONNECTION *conn)

int	tds_connection_read (TDSSOCKET tds, unsigned char buf, int buflen)

static int	tds_connection_signaled (TDSCONNECTION *conn)

int	tds_connection_write (TDSSOCKET tds, const unsigned char buf, int buflen, int final)

DSTR *	tds_dstr_get (TDSSOCKET tds, DSTR s, size_t len)
	Reads a string from wire and put in a DSTR.

TDSRET	tds_flush_packet (TDSSOCKET *tds)
	Flush packet to server.

void	tds_freeze (TDSSOCKET tds, TDSFREEZE freeze, unsigned size_len)
	Stop writing to server and cache every packet not sending them to server.

TDSRET	tds_freeze_abort (TDSFREEZE *freeze)
	Discard all data written after the freeze.

TDSRET	tds_freeze_close (TDSFREEZE *freeze)
	Stop keeping data for this specific freeze.

TDSRET	tds_freeze_close_len (TDSFREEZE *freeze, int32_t size)
	Stop keeping data for this specific freeze.

static void	tds_freeze_update_size (const TDSFREEZE *freeze, int32_t size)

size_t	tds_freeze_written (TDSFREEZE *freeze)
	Compute how many bytes has been written from freeze.

unsigned char	tds_get_byte (TDSSOCKET *tds)
	Return a single byte from the input buffer.

TDSRET	tds_get_char_data (TDSSOCKET tds, char row_buffer, size_t wire_size, TDSCOLUMN *curcol)
	Fetch character data the wire.

bool	tds_get_n (TDSSOCKET tds, void dest, size_t need)
	Get N bytes from the buffer and return them in the already allocated space given to us.

static TDSPACKET *	tds_get_packet (TDSCONNECTION *conn, unsigned len)

static int	tds_get_socket_error (TDS_SYS_SOCKET sock)
	Returns error stored in the socket.

size_t	tds_get_string (TDSSOCKET tds, size_t string_len, char dest, size_t dest_size)
	Fetch a string from the wire.

TDS_UINT	tds_get_uint (TDSSOCKET *tds)
	Get an int32 from the server.

TDS_UINT8	tds_get_uint8 (TDSSOCKET *tds)
	Get an uint64 from the server.

TDS_USMALLINT	tds_get_usmallint (TDSSOCKET *tds)
	Get an int16 from the server.

int	tds_goodread (TDSSOCKET tds, unsigned char buf, int buflen)
	Loops until we have received some characters return -1 on failure.

int	tds_goodwrite (TDSSOCKET tds, const unsigned char buffer, size_t buflen)

int	tds_init_write_buf (TDSSOCKET *tds)

TDSERRNO	tds_open_socket (TDSSOCKET tds, struct addrinfo addr, unsigned int port, int timeout, int *p_oserr)

static void	tds_packet_cache_add (TDSCONNECTION conn, TDSPACKET packet)

unsigned char	tds_peek (TDSSOCKET *tds)
	Reads a byte from the TDS stream without removing it.

int	tds_put_buf (TDSSOCKET tds, const unsigned char buf, int dsize, int ssize)

int	tds_put_byte (TDSSOCKET *tds, unsigned char c)

int	tds_put_cancel (TDSSOCKET *tds)

int	tds_put_int (TDSSOCKET *tds, TDS_INT i)

int	tds_put_int8 (TDSSOCKET *tds, TDS_INT8 i)

int	tds_put_n (TDSSOCKET tds, const void buf, size_t n)

int	tds_put_smallint (TDSSOCKET *tds, TDS_SMALLINT si)

int	tds_put_string (TDSSOCKET tds, const char s, int len)
	Output a string to wire automatic translate string to unicode if needed.

int	tds_read_packet (TDSSOCKET *tds)
	Read in one 'packet' from the server.

int	tds_select (TDSSOCKET *tds, unsigned tds_sel, int timeout_seconds)
	Select on a socket until it's available or the timeout expires.

static TDSERRNO	tds_setup_socket (TDS_SYS_SOCKET p_sock, struct addrinfo addr, unsigned int port, int *p_oserr)
	Setup the socket and attempt a connection.

void	tds_socket_flush (TDS_SYS_SOCKET sock)

static int	tds_socket_read (TDSCONNECTION conn, TDSSOCKET tds, unsigned char *buf, int buflen)
	Read from an OS socket @TODO remove tds, save error somewhere, report error in another way.

int	tds_socket_set_nonblocking (TDS_SYS_SOCKET sock)
	Set socket to non-blocking.

int	tds_socket_set_nosigpipe (TDS_SYS_SOCKET sock, int on)
	Set socket to not throw SIGPIPE.

static int	tds_socket_write (TDSCONNECTION conn, TDSSOCKET tds, const unsigned char *buf, int buflen)
	Write to an OS socket.

void	tds_unget_byte (TDSSOCKET *tds)
	Unget will always work as long as you don't call it twice in a row.

void	tds_wakeup_close (TDSPOLLWAKEUP *wakeup)

int	tds_wakeup_init (TDSPOLLWAKEUP *wakeup)

void	tds_wakeup_send (TDSPOLLWAKEUP *wakeup, char cancel)

TDSRET	tds_write_packet (TDSSOCKET *tds, unsigned char final)

Detailed Description

Functions for reading or writing from network.

Function Documentation

◆ read_and_convert()

static size_t read_and_convert	(	TDSSOCKET *	tds,
		TDSICONV *	char_conv,
		size_t *	wire_size,
		char *	outbuf,
		size_t	outbytesleft
	)

static

For UTF-8 and similar, tds_iconv() may encounter a partial sequence when the chunk boundary is not aligned with the character boundary.

In that event, it will return an error, and some number of bytes (less than a character) will remain in the tail end of temp[]. They are moved to the beginning, ptemp is adjusted to point just behind them, and the next chunk is read.

Parameters

	tds	A pointer to the TDSSOCKET structure managing a client/server operation.
	char_conv	conversion structure
[out]	wire_size	size readed from wire
	outbuf	buffer to write to
	outbytesleft	buffer length

Returns: bytes readed

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◆ tds7_get_instance_port()

int tds7_get_instance_port	(	struct addrinfo *	addr,
		const char *	instance
	)

Get port of given instance.

Returns: port number or 0 if error

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◆ tds7_get_instance_ports()

int tds7_get_instance_ports	(	FILE *	output,
		struct addrinfo *	addr
	)

Get port of all instances.

Returns: default port number or 0 if error

Remarks: experimental, cf. MC-SQLR.pdf.

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◆ tds_close_socket()

void tds_close_socket ( TDSSOCKET * tds )

Close current socket.

For last socket close entire connection. For MARS send FIN request. This attempts a graceful disconnection, for ungraceful call tds_connection_close.

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◆ tds_dstr_get()

DSTR * tds_dstr_get	(	TDSSOCKET *	tds,
		DSTR *	s,
		size_t	len
	)

Reads a string from wire and put in a DSTR.

On error we read the bytes from the wire anyway.

Parameters

	tds	A pointer to the TDSSOCKET structure managing a client/server operation.
[out]	s	output string
[in]	len	string length (in characters)

Returns: string or NULL on error

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◆ tds_flush_packet()

TDSRET tds_flush_packet ( TDSSOCKET * tds )

Flush packet to server.

Returns: TDS_FAIL or TDS_SUCCESS

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◆ tds_freeze()

void tds_freeze	(	TDSSOCKET *	tds,
		TDSFREEZE *	freeze,
		unsigned	size_len
	)

Stop writing to server and cache every packet not sending them to server.

This is used to write data without worrying to compute length before. If size_len is provided the number of bytes written between tds_freeze and tds_freeze_close will be written as a number of size size_len. This call should be followed by a tds_freeze_close, tds_freeze_close_len or a tds_freeze_abort. Failing to match tds_freeze with a close would possibly result in a disconnection from the server.

Parameters

[out]	freeze	structure to initialize
	size_len	length of the size to automatically write on close (0, 1, 2, or 4)

◆ tds_freeze_abort()

TDSRET tds_freeze_abort ( TDSFREEZE * freeze )

Discard all data written after the freeze.

After this call freeze should not be used.

Parameters

[in] freeze structure to work on

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◆ tds_freeze_close()

TDSRET tds_freeze_close ( TDSFREEZE * freeze )

Stop keeping data for this specific freeze.

If size_len was used for tds_freeze this function write the written bytes at position when tds_freeze was called. After this call freeze should not be used.

Parameters

[in] freeze structure to work on

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◆ tds_freeze_close_len()

TDSRET tds_freeze_close_len	(	TDSFREEZE *	freeze,
		int32_t	size
	)

Stop keeping data for this specific freeze.

Similar to tds_freeze_close but specify the size to be written instead of letting tds_freeze_close compute it. After this call freeze should not be used.

Parameters

[in]	freeze	structure to work on
[in]	size	size to write

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◆ tds_freeze_written()

size_t tds_freeze_written ( TDSFREEZE * freeze )

Compute how many bytes has been written from freeze.

Returns: bytes written since tds_freeze call

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◆ tds_get_byte()

unsigned char tds_get_byte ( TDSSOCKET * tds )

Return a single byte from the input buffer.

Parameters

tds	A pointer to the TDSSOCKET structure managing a client/server operation.

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◆ tds_get_char_data()

TDSRET tds_get_char_data	(	TDSSOCKET *	tds,
		char *	row_buffer,
		size_t	wire_size,
		TDSCOLUMN *	curcol
	)

Fetch character data the wire.

Output is NOT null terminated. If char_conv is not NULL, convert data accordingly.

Parameters

tds	state information for the socket and the TDS protocol
row_buffer	destination buffer in current_row. Can't be NULL
wire_size	size to read from wire (in bytes)
curcol	column information

Returns: TDS_SUCCESS or TDS_FAIL (probably memory error on text data)

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◆ tds_get_n()

bool tds_get_n	(	TDSSOCKET *	tds,
		void *	dest,
		size_t	need
	)

Get N bytes from the buffer and return them in the already allocated space
given to us.

We ASSUME that the person calling this function has done the
bounds checking for us since they know how many bytes they want here. dest of NULL means we just want to eat the bytes. (tethe.nosp@m.row@.nosp@m.nol.o.nosp@m.rg)

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◆ tds_get_string()

size_t tds_get_string	(	TDSSOCKET *	tds,
		size_t	string_len,
		char *	dest,
		size_t	dest_size
	)

Fetch a string from the wire.

Output string is NOT null terminated. If TDS version is 7 or 8 read unicode string and convert it. This function should be use to read server default encoding strings like columns name, table names, etc, not for data (use tds_get_char_data instead)

Returns: bytes written to dest

Parameters

tds	connection information
string_len	length of string to read from wire (in server characters, bytes for tds4-tds5, ucs2 for tds7+)
dest	destination buffer, if NULL string is read and discarded
dest_size	destination buffer size, in bytes

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◆ tds_get_uint()

TDS_UINT tds_get_uint ( TDSSOCKET * tds )

Get an int32 from the server.

Parameters

tds	A pointer to the TDSSOCKET structure managing a client/server operation.

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◆ tds_get_uint8()

TDS_UINT8 tds_get_uint8 ( TDSSOCKET * tds )

Get an uint64 from the server.

Parameters

tds	A pointer to the TDSSOCKET structure managing a client/server operation.

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◆ tds_goodwrite()

int tds_goodwrite	(	TDSSOCKET *	tds,
		const unsigned char *	buffer,
		size_t	buflen
	)

Parameters

tds	the famous socket
buffer	data to send
buflen	bytes in buffer
last	1 if this is the last packet, else 0

Returns: length written (>0), <0 on failure

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◆ tds_peek()

unsigned char tds_peek ( TDSSOCKET * tds )

Reads a byte from the TDS stream without removing it.

Parameters

tds	A pointer to the TDSSOCKET structure managing a client/server operation.

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◆ tds_put_string()

int tds_put_string	(	TDSSOCKET *	tds,
		const char *	s,
		int	len
	)

Output a string to wire automatic translate string to unicode if needed.

Returns: bytes written to wire

Parameters

tds	state information for the socket and the TDS protocol
s	string to write
len	length of string in characters, or -1 for null terminated

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◆ tds_read_packet()

int tds_read_packet ( TDSSOCKET * tds )

Read in one 'packet' from the server.

This is a wrapped outer packet of the protocol (they bundle result packets into chunks and wrap them at what appears to be 512 bytes regardless of how that breaks internal packet up. (tetherow@nol.org)

Returns: bytes read or -1 on failure

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◆ tds_select()

int tds_select	(	TDSSOCKET *	tds,
		unsigned	tds_sel,
		int	timeout_seconds
	)

Select on a socket until it's available or the timeout expires.

Meanwhile, call the interrupt function.

Returns: >0 ready descriptors 0 timeout <0 error (cf. errno). Caller should close socket and return failure. This function does not call tdserror or close the socket because it can't know the context in which it's being called.

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◆ tds_setup_socket()

static TDSERRNO tds_setup_socket	(	TDS_SYS_SOCKET *	p_sock,
		struct addrinfo *	addr,
		unsigned int	port,
		int *	p_oserr
	)

static

Setup the socket and attempt a connection.

Function allocate the socket in *p_sock and try to start a connection.

Parameters

p_sock	where returned socket is stored. Socket is stored even on error. Can be INVALID_SOCKET.
addr	address to use for attempting the connection
port	port to connect to
p_oserr	where system error is returned

Returns: TDSEOK is success, TDSEINPROGRESS if connection attempt is started or any other error.

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◆ tds_socket_read()

static int tds_socket_read	(	TDSCONNECTION *	conn,
		TDSSOCKET *	tds,
		unsigned char *	buf,
		int	buflen
	)

static

Read from an OS socket @TODO remove tds, save error somewhere, report error in another way.

Returns: 0 if blocking, <0 error >0 bytes read

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◆ tds_socket_set_nonblocking()

int tds_socket_set_nonblocking ( TDS_SYS_SOCKET sock )

Set socket to non-blocking.

Parameters

sock	socket to set

Returns: 0 on success or error code

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◆ tds_socket_set_nosigpipe()

int tds_socket_set_nosigpipe	(	TDS_SYS_SOCKET	sock,
		int	on
	)

Set socket to not throw SIGPIPE.

Not many systems support this feature (in this case ENOTSUP can be returned).

Parameters

sock	socket to set
on	flag if enable or disable

Returns: 0 on success or error code

◆ tds_socket_write()

static int tds_socket_write	(	TDSCONNECTION *	conn,
		TDSSOCKET *	tds,
		const unsigned char *	buf,
		int	buflen
	)

static

Write to an OS socket.

Returns: 0 if blocking, <0 error >0 bytes readed

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◆ tds_unget_byte()

void tds_unget_byte ( TDSSOCKET * tds )

Unget will always work as long as you don't call it twice in a row.

It it may work if you call it multiple times as long as you don't backup over the beginning of network packet boundary which can occur anywhere in the token stream.

Parameters

tds	A pointer to the TDSSOCKET structure managing a client/server operation.

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Classes

Functions

Detailed Description

Function Documentation

◆ read_and_convert()

◆ tds7_get_instance_port()

◆ tds7_get_instance_ports()

◆ tds_close_socket()

◆ tds_dstr_get()

◆ tds_flush_packet()

◆ tds_freeze()

◆ tds_freeze_abort()

◆ tds_freeze_close()

◆ tds_freeze_close_len()

◆ tds_freeze_written()

◆ tds_get_byte()

◆ tds_get_char_data()

◆ tds_get_n()

◆ tds_get_string()

◆ tds_get_uint()

◆ tds_get_uint8()

◆ tds_goodwrite()

◆ tds_peek()

◆ tds_put_string()

◆ tds_read_packet()

◆ tds_select()

◆ tds_setup_socket()

◆ tds_socket_read()

◆ tds_socket_set_nonblocking()

◆ tds_socket_set_nosigpipe()

◆ tds_socket_write()

◆ tds_unget_byte()