.Dd May 2, 2017
.Os FreeTDS 1.2.3
.Dt FREETDS.CONF "FreeTDS 5" "FreeTDS Reference Manual"
.
.Sh NAME
.Nm freetds.conf
.Nd configuration file for FreeTDS
.
.Sh SYNOPSIS
The 
.Pa freetds.conf
file describes Sybase and Microsoft database servers to the FreeTDS
library.  It comprises sections headed by a servername, followed by a
list of connection properties denoted as name-value pairs.  Defaults
are defined via a
.Bq global
section.  This file supersedes the 
.Pa interfaces
file that
Sybase defines for the same purpose, although the latter is still supported.
.
.Sh DESCRIPTION
A section begins with a servername \(em the name of the server \(em in
square brackets. The servername is chosen at the client's descretion.
(One exception: with Sybase ASA the servername must match the database
name to be used.)
.Pp
Sections contain properties, one per line, in the form
.Pp
.Dl       name = value
.Pp
where
.Ar name
is the connection property to be described.  Servernames and properties
are not case sensitive.  Values are case-preserving i.e., copied literally.
Comments begin with either a semicolon
.Pq So ; Sc
or pound sign
.Pq So # Sc
and continue to end of line.  Blank lines are ignored.  Whitespace surrounding the
.So = Sc is ignored.
.
.Sh PROPERTIES
.Bl -tag -width "emulate little endian" -compact
.
.It client charset
encoding of client data; overrides locale(1) settings
.Bl -tag -width "default:" -compact
.It Domain:
iconv character set names
.It Default:
ISO-8859-1
.El
.
.It connect timeout
seconds to wait for response from connect request
.Bl -tag -width "default:" -compact
.It Domain:
0 to MAX_INT
.It Default:
none
.El
.
.It debug flags
logging granularity
.Bl -tag -width "default:" -compact
.It Domain:
32-bit integer
.It Default:
0x4fff
.El
.
.It dump file
specifies location of a logfile and turns on logging
.Bl -tag -width "default:" -compact
.It Domain:
valid file name
.It Default:
none
.El
.
.It dump file append
log data appended to file instead of re-writing for each connection
.Bl -tag -width "default:" -compact
.It Domain:
yes/no
.It Default:
no
.El
.
.It emulate little endian
forces big endian machines to act as little endian to communicate with
Microsoft Servers
.Bl -tag -width "default:" -compact
.It Domain:
yes/no
.It Default:
no
.El
.
.It encryption
.Bl -tag -compact
.It Em off
disables encryption
.It Em request
use if available (default when tds version greater than 7.0)
.It Em required
allow encrypted connections only
.El
.
.It host
Name of the host the server is running on.
.Bl -tag -width "default:" -compact
.It Domain:
host name or IP address
.It Default:
SYBASE
.El
.
.It initial block size
maximum size of a protocol block
.Bl -tag -width "default:" -compact
.It Domain:
multiple of 512
.It Default:
512
.El
.
.It instance
name of Microsoft SQL Server instance to connect to (supersedes
.Em port )
.Bl -tag -width "default:" -compact
.It Domain:
instance name
.It Default:
none
.El
.
.It port
port number that the server is listening to
.Bl -tag -width "default:" -compact
.It Domain:
any valid port
.It Default:
TDS 5.0, 5000; TDS 7.0 and up, 1433
.El
.
.It tds version
TDS protocol version to use
.Bl -tag -width "default:" -compact
.It Domain:
4.2, 5.0, 7.0, 7.1, 7.2
.It Default:
.Fl -with-tdsver
value (5.0 if unspecified)
.El
.
.It text size
default value of TEXTSIZE, in bytes
.Bl -tag -width "default:" -compact
.It Domain:
0 to 4,294,967,295
.It Default:
4,294,967,295
.El
.
.It timeout
seconds to wait for response to a query
.Bl -tag -width "default:" -compact
.It Domain:
0 to MAX_INT
.It Default:
none (wait forever)
.El
.
.El
.Pp
Do not define both 
.Fa port
and
.Fa instance Ns
\&.  One implies the other.  
.Pp
Boolean property values may be denoted as on/off, true/false, or 1/0.
.
.Ss DEBUG FLAGS 
The log's granularity can be controlled with the 
.Em debug flags
property. 
.Bl -column -offset indent ".Sy 0x8000" ".Sy show source level info (source file and line)"
.It Sy Value Ta Sy Meaning
.It Li \ \ 0x02	severe error
.It Li \ \ 0x04	error
.It Li \ \ 0x08	warning
.It Li \ \ 0x10	network
.It Li \ \ 0x20	information level 1
.It Li \ \ 0x40	information level 2
.It Li \ \ 0x80	function trace and info
.It Li 0x1000	show pid
.It Li 0x2000	show time
.It Li 0x4000	show source level info (source file and line)
.It Li 0x8000	thread id (not implemented).
.El
.
.Sh NAMES AND LOCATIONS
The file is normally named
.Pa /etc/freetds.conf
or
.Pa ${HOME}/.freetds.conf .
That name can be overridden with the FREETDSCONF environment variable.
.Pp
FreeTDS will search conf files for a servername in the following order:
.Bl -enum -offset indent -compact
.It
a filename set programmatically via dbsetifile() that is in .conf format
.It
a filename in the environment variable FREETDSCONF that is in .conf format
.It
.Pa ${HOME}/.freetds.conf
if extant
.It
.Pa /etc/freetds/freetds.conf
.El
.Pp
The search stops with the first file containing the servername.
.Pp
If no conf file is found, FreeTDS searches for
an
.Pa interfaces
file in the following order:
.Bl -enum -offset indent -compact
.It
a filename set programmatically via dbsetifile() that is in
.Pa interfaces
format
.It
.Pa ${HOME}/.interfaces
.It
.Pa $SYBASE/interfaces
(where
.Ev $SYBASE is an environment variable)
.El
.Pp
If the requested servername is not found in any configuration file, the fallback
mechanism is:
.Bl -enum -offset indent -compact
.It
attempt to convert the name to an IP address with inet_addr(3), else
.It
attempt to convert the name to an IP address with gethostbyname(3), else
.It
attempt to look up the literal name
.Dq SYBASE
.El
.
.Sh ENVIRONMENT
.Bl -tag -width "TDSDUMPCONFIG" -compact
.It Ev FREETDSCONF
overrides name and location of the system-wide conf file
.It Ev TDSDUMP
overrides the name and location of the FreeTDS log file
.It Ev TDSDUMPCONFIG
specifies a name and location of a file that logs the search of
configuration files
.It Ev TDSHOST
overrides the host property
.It Ev TDSPORT
overrides the port property
.It Ev TDSQUERY
synonym for DSQUERY, the default servername
.It Ev TDSVER
overrides the version specified in the freetds.conf
.El
.Pp
The environment variables
.Ev TDSVER, Ev TDSDUMP, Ev TDSPORT, Ev TDSQUERY, and Ev TDSHOST
override values set by a .conf or
.Pa interfaces
file.
.
.Sh FILES
.Pa /etc/freetds/freetds.conf , ${HOME}/.freetds.conf
.
.Sh SEE ALSO
.%B FreeTDS User Guide
.
.Sh HISTORY
\&.conf files first appeared with version 0.53 of FreeTDS.