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//proc/self/root/usr/share/doc/freetds-0.64/cap.txt

Capabilities
------------

The TDS_CAP_TOKEN token (decimal 226) in TDS is sent to the server immediately 
after the login sequence in TDS 5.0. It is sent back as part of the login 
acknowledgement stream. The client requests which capabilities it wants and 
the server sends back which ones it supports.

I'm not certain but I believe a full 5.0 login sequence could be sent to an 
MS-SQL or Sybase 4.x server and if the 226 token is absent from the return 
stream then the protocol could default back to 4.2. This would eliminate the
need for compiling two versions of the library, of course setting the proto
version manually would not send the capabilities. I need someone to try this
as I only have access to Sybase 11.x servers.

The layout of the capabilities packet is:
  1 byte       2 bytes        n bytes
+---------+---------------+---------------------+
|  226    | size of mask  | capabilities field  |
+---------+---------------+---------------------+

The capabilities field looks like:
  1 byte   1 byte   n bytes
+--------+--------+---------------+
|   id   |  size  |    bitmask    |
+--------+--------+---------------+

1) For id 1 seems to signify request capabilities and 2 is response capabilities.
2) The size represents the size of the bitmask (7 for all I've seen).
3) The bitmask is is a bitset mask denoting values set by ct_capability()
   or similar call.  It is packed from the low order bit to high order bit.
   The first bit (low order bit...bit 0 of byte 6) is not used for a capability.
   It seems to be used by the protocol but its function is presently unknown.

A listing of all known values for the bitmasks follows with its ctlib 
constant.  Refer to the ctlib documentation for descriptions of these.

REQUEST CAPABILITIES
--------------------
byte 0:
default ctlib value: 3
bit 0 (0x01): CS_PROTO_DYNPROC
bit 1 (0x02): CS_DATA_FLTN
bit 2 (0x04): CS_DATA_BITN
bit 3 (0x08): CS_DATA_INT8 
bit 4 (0x10): CS_DATA_VOID
bit 5 (0x20): unknown
bit 6 (0x40): unknown
bit 7 (0x80): unknown

byte 1:
default ctlib value: 109 
bit 0 (0x01): CS_CON_INBAND
bit 1 (0x02): CS_CON_LOGICAL
bit 2 (0x04): CS_PROTO_TEXT
bit 3 (0x08): CS_PROTO_BULK
bit 4 (0x10): CS_REQ_URGNOTIF
bit 5 (0x20): CS_DATA_SENSITIVITY
bit 6 (0x40): CS_DATA_BOUNDARY
bit 7 (0x80): CS_PROTO_DYNAMIC

byte 2:
default ctlib value: 127
bit 0 (0x01): CS_DATA_MONEYN
bit 1 (0x02): CS_CSR_PREV
bit 2 (0x04): CS_CSR_FIRST
bit 3 (0x08): CS_CSR_LAST
bit 4 (0x10): CS_CSR_ABS
bit 5 (0x20): CS_CSR_REL
bit 6 (0x40): CS_CSR_MULTI
bit 7 (0x80): CS_CON_OOB

byte 3:
default ctlib value: 255
bit 0 (0x01): CS_DATA_NUM
bit 1 (0x02): CS_DATA_TEXT
bit 2 (0x04): CS_DATA_IMAGE
bit 3 (0x08): CS_DATA_DEC
bit 4 (0x10): CS_DATA_LCHAR
bit 5 (0x20): CS_DATA_LBIN
bit 6 (0x40): CS_DATA_INTN
bit 7 (0x80): CS_DATA_DATETIMEN

byte 4:
default ctlib value: 255
bit 0 (0x01): CS_DATA_BIN
bit 1 (0x02): CS_DATA_VBIN
bit 2 (0x04): CS_DATA_MNY8
bit 3 (0x08): CS_DATA_MNY4
bit 4 (0x10): CS_DATA_DATE8
bit 5 (0x20): CS_DATA_DATE4
bit 6 (0x40): CS_DATA_FLT4
bit 7 (0x80): CS_DATA_FLT8

byte 5:
default ctlib value: 255
bit 0 (0x01): CS_REQ_MSG
bit 1 (0x02): CS_REQ_PARAM
bit 2 (0x04): CS_DATA_INT1
bit 3 (0x08): CS_DATA_INT2
bit 4 (0x10): CS_DATA_INT4
bit 5 (0x20): CS_DATA_BIT
bit 6 (0x40): CS_DATA_CHAR
bit 7 (0x80): CS_DATA_VCHAR

byte 6:
default ctlib value: 254
bit 0 (0x01): unknown
bit 1 (0x02): CS_REQ_LANG
bit 2 (0x04): CS_REQ_RPC
bit 3 (0x08): CS_REQ_NOTIF
bit 4 (0x10): CS_REQ_MSTMT
bit 5 (0x20): CS_REQ_BCP
bit 6 (0x40): CS_REQ_CURSOR
bit 7 (0x80): CS_REQ_DYN

RESPONSE CAPABILITIES
---------------------
byte 0:
default ctlib value: 0
bit 0 (0x01): unknown
bit 1 (0x02): unknown
bit 2 (0x04): unknown
bit 3 (0x08): unknown
bit 4 (0x10): unknown
bit 5 (0x20): unknown
bit 6 (0x40): unknown
bit 7 (0x80): unknown

byte 1:
default ctlib value: 0
bit 0 (0x01): unknown
bit 1 (0x02): unknown
bit 2 (0x04): unknown
bit 3 (0x08): unknown
bit 4 (0x10): unknown
bit 5 (0x20): unknown
bit 6 (0x40): unknown
bit 7 (0x80): unknown

byte 2: (88)
default ctlib value: 10
bit 0 (0x01): CS_DATA_NOBOUNDARY
bit 1 (0x02): CS_DATA_NOTDSDEBUG
bit 2 (0x04): CS_RES_NOSTRIPBLANKS
bit 3 (0x08): CS_DATA_NOINT8
bit 4 (0x10): unknown
bit 5 (0x20): unknown
bit 6 (0x40): unknown
bit 7 (0x80): unknown

byte 3: (89)
default ctlib value: 120 
bit 0 (0x01): CS_DATA_NOINTN
bit 1 (0x02): CS_DATA_NODATETIMEN
bit 2 (0x04): CS_DATA_MONEYN
bit 3 (0x08): CS_CON_NOOOB
bit 4 (0x10): CS_CON_NOINBAND
bit 5 (0x20): CS_PROTO_NOTEXT
bit 6 (0x40): CS_PROTO_NOBULK
bit 7 (0x80): CS_DATA_NOSENSITIVITY

byte 4: (90)
default ctlib value: 0
bit 0 (0x01): CS_DATA_NOFLT4
bit 1 (0x02): CS_DATA_NOFLT8
bit 2 (0x04): CS_DATA_NONUM
bit 3 (0x08): CS_DATA_NOTEXT
bit 4 (0x10): CS_DATA_IMAGE
bit 5 (0x20): CS_DATA_NODEC
bit 6 (0x40): CS_DATA_NOLCHAR
bit 7 (0x80): CS_DATA_NOLBIN

byte 5: (91)
default ctlib value: 0
bit 0 (0x01): CS_DATA_NOCHAR
bit 1 (0x02): CS_DATA_NOVCHAR
bit 2 (0x04): CS_DATA_NOBIN
bit 3 (0x08): CS_DATA_NOVBIN
bit 4 (0x10): CS_DATA_NOMNY8
bit 5 (0x20): CS_DATA_NOMNY4
bit 6 (0x40): CS_DATA_NODATE8
bit 7 (0x80): CS_DATA_NODATE4

byte 6: (92)
default ctlib value: 0
bit 0 (0x01): unknown
bit 1 (0x02): CS_RES_NOMSG
bit 2 (0x04): CS_RES_NOEED
bit 3 (0x08): CS_RES_NOPARAM
bit 4 (0x10): CS_DATA_NOINT1
bit 5 (0x20): CS_DATA_NOINT2
bit 6 (0x40): CS_DATA_NOINT4
bit 7 (0x80): CS_DATA_NOBIT