282 lines
6.8 KiB
Groff
282 lines
6.8 KiB
Groff
.\" Copyright (c) 2009 James Gritton.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 24, 2009
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.Dt JAIL 3
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.Os
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.Sh NAME
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.Nm jail_getid ,
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.Nm jail_getname ,
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.Nm jail_setv ,
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.Nm jail_getv ,
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.Nm jailparam_all ,
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.Nm jailparam_init ,
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.Nm jailparam_import ,
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.Nm jailparam_import_raw ,
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.Nm jailparam_set ,
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.Nm jailparam_get ,
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.Nm jailparam_export ,
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.Nm jailparam_free
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.Nd create and manage system jails
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.Sh LIBRARY
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.Lb libjail
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/jail.h
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.In jail.h
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.Vt extern char jail_errmsg[] ;
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.Ft int
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.Fn jail_getid "const char *name"
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.Ft char *
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.Fn jail_getname "int jid"
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.Ft int
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.Fn jail_setv "int flags" ...
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.Ft int
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.Fn jail_getv "int flags" ...
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.Ft int
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.Fn jailparam_all "struct jailparam **jpp"
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.Ft int
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.Fn jailparam_init "struct jailparam *jp" "const char *name"
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.Ft int
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.Fn jailparam_import "struct jailparam *jp" "const char *value"
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.Ft int
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.Fn jailparam_import_raw "struct jailparam *jp" "void *value" "size_t valuelen"
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.Ft int
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.Fn jailparam_set "struct jailparam *jp" "unsigned njp" "int flags"
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.Ft int
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.Fn jailparam_get "struct jailparam *jp" "unsigned njp" "int flags"
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.Ft char *
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.Fn jailparam_export "struct jailparam *jp"
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.Ft void
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.Fn jailparam_free "struct jailparam *jp" "unsigned njp"
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.Sh DESCRIPTION
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The
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.Nm jail
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library is an interface to the
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.Xr jail_set 2
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and
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.Xr jail_get 2
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system calls, and the
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.Va security.jail.param
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MIB entries.
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It simplifies the conversion of prison parameters between internal and
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string formats, allowing the setting and querying of prisons without
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knowing the parameter formats.
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.Pp
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The
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.Fn jail_getid
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function returns the JID of the jail identified by
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.Fa name ,
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or \-1 if the jail does not exist.
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.Pp
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The
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.Fn jail_getname
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function returns the name of the jail identified by
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.Fa jid ,
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or
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.Dv NULL
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if the jail does not exist.
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.Pp
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The
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.Fn jail_setv
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function takes a null-terminated list of name and value strings,
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and passes it to
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.Xr jail_set 2 .
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.Pp
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The
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.Fn jail_getv
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function takes a null-terminated list of name and value strings,
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and passes it to
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.Xr jail_get 2 .
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It is the caller's responsibility to ensure that the value strings point
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to buffers large enough to hold the string representation of the
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returned parameters.
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.Pp
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The
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.Fn jailparam_all
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function sets
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.Fa jpp
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to a list of all known jail parameters, and returns the number of
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parameters.
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The list should later be freed with
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.Fn jailparam_free
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and
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.Xr free 3 .
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.Pp
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The
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.Fn jailparam_init
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function clears a parameter record and copies the
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.Fa name
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to it.
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After use, it should be freed with
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.Fn jailparam_free .
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.Pp
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The
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.Fn jailparam_import
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function adds a
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.Fa value
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to a parameter record, converting it from a string to its native form.
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The
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.Fn jailparam_import_raw
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function adds a value without performing any conversion.
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.Pp
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The
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.Fn jailparam_set
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function passes a list of parameters to
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.Xr jail_set 2 .
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The parameters are assumed to have been created with
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.Fn jailparam_init
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and
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.Fn jailparam_import .
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.Pp
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The
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.Fn jailparam_get
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function passes a list of parameters to
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.Xr jail_get 2 .
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The parameters are assumed to have been created with
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.Fn jailparam_init
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or
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.Fn jailparam_list ,
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with one parameter (the key) having been given a value with
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.Fn jailparam_import .
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.Pp
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The
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.Fn jailparam_export
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function returns the string equivalent of a parameter value.
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The returned string should be freed after use.
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.Pp
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The
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.Fn jailparam_free
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function frees the stored names and values in a parameter list.
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If the list itself came from
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.Fn jailparam_all ,
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it should be freed as well.
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.Sh RETURN VALUES
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The
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.Fn jail_getid ,
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.Fn jail_setv ,
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.Fn jail_getv ,
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.Fn jailparam_set
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and
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.Fn jailparam_get
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functions return a JID on success, or \-1 on error.
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.Pp
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The
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.Fn jail_getname
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and
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.Fn jailparam_export
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functions return a dynamically allocated string on success, or
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.Dv NULL
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on error.
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.Pp
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The
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.Fn jailparam_all
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function returns the number of parameters on success, or \-1 on error.
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.Pp
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The
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.Fn jailparam_init ,
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.Fn jailparam_import
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and
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.Fn jailparam_import_raw
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functions return 0 on success, or \-1 on error.
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.Pp
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Whenever an error is returned,
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.Va errno
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is set, and the global string
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.Va jail_errmsg
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contains a description of the error, possibly from
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.Xr jail_set 2
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or
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.Xr jail_get 2 .
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.Sh EXAMPLES
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Set the hostname of jail
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.Dq foo
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to
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.Dq foo.bar :
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.Bd -literal -offset indent
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jail_setv(JAIL_UPDATE, "name", "foo", "host.hostname", "foo.bar",
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NULL);
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.Ed
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.Pp
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OR:
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.Bd -literal -offset indent
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struct jailparam params[2];
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jailparam_init(¶ms[0], "name");
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jailparam_import(¶ms[0], "foo");
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jailparam_init(¶ms[1], "host.hostname");
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jailparam_import(¶ms[1], "foo.bar");
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jailparam_set(params, 2, JAIL_UPDATE);
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jailparam_free(params, 2);
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.Ed
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.Pp
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Retrieve the hostname of jail
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.Dq foo :
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.Bd -literal -offset indent
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char hostname[MAXHOSTNAMELEN];
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jail_getv(0, "name", "foo", "host.hostname", hostname, NULL);
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.Ed
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.Pp
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OR:
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.Bd -literal -offset indent
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struct jailparam params[2];
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jailparam_init(¶ms[0], "name");
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jailparam_import(¶ms[0], "foo");
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jailparam_init(¶ms[1], "host.hostname");
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jailparam_get(params, 2, 0);
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hostname = jailparam_export(¶ms[1]);
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jailparam_free(params, 2);
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.Ed
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.Sh ERRORS
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The
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.Nm jail
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functions may return errors from
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.Xr jail_set 2 ,
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.Xr jail_get 2 ,
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.Xr malloc 3
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or
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.Xr sysctl 3 .
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In addition, the following errors are possible:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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A parameter value cannot be converted from the passed string to its
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internal form.
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.It Bq Er ENOENT
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The named parameter does not exist.
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.It Bq Er ENOENT
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A parameter is of an unknown type.
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.El
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.Sh SEE ALSO
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.Xr jail 2 ,
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.Xr sysctl 3 ,
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.Xr jail 8
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.Sh HISTORY
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The
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.Nm jail
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library first appeared in
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.Fx 8.0 .
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.Sh AUTHORS
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.An James Gritton
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