VSCAND(8) Maintenance Commands and Procedures VSCAND(8)


vscand - vscan service daemon




vscand is the daemon that handles virus scan requests from file systems
on file open and close operations. A file system may support enabling and
disabling of virus scanning on a per dataset basis, using that file
system's administrative command, for example zfs(8).

If the file state or scan policy (see vscanadm(8) requires that a file be
scanned, vscand communicates with external third-party virus scanners
(scan engines) using the Internet Content Adaptation Protocol (ICAP, RFC
3507) to have the file scanned.

A file is submitted to a scan engine if it has been modified since it was
last scanned, or if it has not been scanned with the latest scan engine
configuration (Virus definitions). The file's modified attribute and
scanstamp attribute are used to store this information. Once the file is
scanned, the modified attribute is cleared and the scanstamp attribute is

If the file is found to contain a virus, the virus is logged in
syslogd(8), an audit record is written, and the file is quarantined (by
setting its quarantine attribute). Once a file is quarantined, attempts
to read, execute or rename the file will be denied by the file system.
The syslogd(8) entry and the audit record specify the name of the
infected file and the violations detected in the file. Each violation is
specified as "ID - threat description", where ID and threat description
are defined in the X-Infection-Found-Header in ICAP RFC 3507; Extensions.

By default, vscand connects to scan engines on port 1344. The port and
other service configuration parameters can be configured using

The vscan service is disabled by default, and can be enabled using


The following exit values are returned:

Daemon started successfully.

Daemon failed to start.


See attributes(7) for descriptions of the following attributes:

|Interface Stability | Uncommitted |


ps(1), svcs(1), attributes(7), smf(7), logadm(8), svcadm(8), syslogd(8),
vscanadm(8), zfs(8)


If a file is accessed using a protocol which does not invoke the file
system open and close operations, for example NFSv3, virus scanning is
not initiated on the file.

File content is transferred to the scan engines as cleartext data.

Administrative actions for the vscan service, such as enabling,
disabling, or requesting a restart, can be performed using svcadm(8).
The vscan service status can be queried using the svcs(1) command.

The vscan service is managed by the service management facility, smf(7),
under the service identifier:


illumos November 6, 2007 VSCAND(8)