freebsd-dev/bin/sh/builtins.def

97 lines
3.2 KiB
Modula-2
Raw Normal View History

#!/bin/sh -
#-
# Copyright (c) 1991, 1993
# The Regents of the University of California. All rights reserved.
#
# This code is derived from software contributed to Berkeley by
# Kenneth Almquist.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of the University nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#)builtins.def 8.4 (Berkeley) 5/4/95
1999-08-27 23:15:48 +00:00
# $FreeBSD$
#
# This file lists all the builtin commands. The first column is the name
# of a C routine.
# The -j flag specifies that this command is to be excluded from systems
# without job control.
# The -h flag specifies that this command is to be excluded from systems
# based on the NO_HISTORY compile-time symbol.
# The -n flag specifies that this command can safely be run in the same
# process when it is the only command in a command substitution. Some
# commands have special logic defined in safe_builtin().
# The -s flag specifies that this is a POSIX 'special built-in' command.
# The rest of the line specifies the command name or names used to run the
# command. The entry for bltincmd, which is run when the user does not specify
# a command, must come first.
#
# NOTE: bltincmd must come first!
bltincmd -n builtin
2005-12-04 20:01:48 +00:00
aliascmd alias
bgcmd -j bg
2005-12-04 20:01:48 +00:00
bindcmd bind
breakcmd -s break -s continue
cdcmd cd chdir
commandcmd -n command
dotcmd -s .
echocmd -n echo
evalcmd -s eval
execcmd -s exec
exitcmd -s exit
letcmd let
exportcmd -s export -s readonly
#exprcmd expr
falsecmd -n false
fgcmd -j fg
wordexp: Rewrite to make WRDE_NOCMD reliable. Shell syntax is too complicated to detect command substitution and unquoted operators reliably without implementing much of sh's parser. Therefore, have sh do this detection. While changing sh's support anyway, also read input from a pipe instead of arguments to avoid {ARG_MAX} limits and improve privacy, and output count and length using 16 instead of 8 digits. The basic concept is: execl("/bin/sh", "sh", "-c", "freebsd_wordexp ${1:+\"$1\"} -f "$2", "", flags & WRDE_NOCMD ? "-p" : "", <pipe with words>); The WRDE_BADCHAR error is still implemented in libc. POSIX requires us to fail strings containing unquoted braces with code WRDE_BADCHAR. Since this is normally not a syntax error in sh, there is still a need for checking code in libc, we_check(). The new we_check() is an optimistic check that all the characters <newline> | & ; < > ( ) { } are quoted. To avoid duplicating too much sh logic, such characters are permitted when quoting characters are seen, even if the quoting characters may themselves be quoted. This code reports all WRDE_BADCHAR errors; bad characters that get past it and are a syntax error in sh return WRDE_SYNTAX. Although many implementations of WRDE_NOCMD erroneously allow some command substitutions (and ours even documented this), there appears to be code that relies on its security (codesearch.debian.net shows quite a few uses). Passing untrusted data to wordexp() still exposes a denial of service possibility and a fairly large attack surface. Reviewed by: wblock (man page only) MFC after: 2 weeks Relnotes: yes Security: fixes command execution with wordexp(untrusted, WRDE_NOCMD)
2015-09-30 21:32:29 +00:00
freebsd_wordexpcmd freebsd_wordexp
getoptscmd getopts
hashcmd hash
2005-12-04 20:01:48 +00:00
histcmd -h fc
jobidcmd -n jobid
jobscmd -n jobs
killcmd -n kill
localcmd local
printfcmd -n printf
pwdcmd -n pwd
readcmd read
returncmd -s return
setcmd -s set
setvarcmd setvar
shiftcmd -s shift
testcmd -n test [
timescmd -n -s times
trapcmd -s trap
truecmd -n -s : true
typecmd -n type
2005-12-04 20:01:48 +00:00
ulimitcmd ulimit
umaskcmd umask
unaliascmd unalias
unsetcmd -s unset
waitcmd wait
wordexpcmd wordexp