/usr/share/rkhunter/scripts/readlink.sh is in rkhunter 1.4.2-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | #!/bin/sh
#
# This is a short script to get the full pathname of a link file.
# It has the same effect as the Linux 'readlink -f' command. The
# script was written because some systems have no 'readlink' command,
# and others have no '-f' option for readlink. As such we use the 'ls'
# and 'awk' commands to get the link target.
#
# We check the 'pwd' command because the shell builtin command will
# usually print out the current directory, which may be a link, rather
# than the true working directory. The (typically) '/bin/pwd' command
# itself shows the true directory.
#
# A soft (symbolic) link has two parts to it:
#
# linkname -> target
#
# Usage: readlink.sh [-f] <linkname> [pwd command]
#
#
# We don't actually do anything with the '-f' option
# if it is used.
#
test "$1" = "-f" && shift
LINKNAME=$1
PWD_CMD=$2
test -z "${PWD_CMD}" -o ! -x "${PWD_CMD}" && PWD_CMD="pwd"
#
# If we were given just a filename, then prepend
# the current directory to it.
#
if [ -z "`echo \"${LINKNAME}\" | grep '/'`" ]; then
DIR=`${PWD_CMD}`
test "${DIR}" = "/" && DIR=""
LINKNAME="${DIR}/${LINKNAME}"
fi
#
# Now do some tests on the link name.
#
if [ -d "${LINKNAME}" ]; then
FNAME=""
DIR="${LINKNAME}"
else
#
# We have been given a pathname to a file. Separate
# out the filename and the directory.
#
FNAME=`echo "${LINKNAME}" | sed -e 's:^.*/\([^/]*\)$:\1:'`
DIR=`echo "${LINKNAME}" | sed -e 's:/[^/]*$::'`
# Check if it is a top-level name.
if [ -z "${DIR}" ]; then
if [ ! -e "${LINKNAME}" ]; then
DIR="${LINKNAME}"
else
DIR="/"
fi
fi
if [ ! -d "${DIR}" ]; then
echo "Directory ${DIR} does not exist." >&2
echo "${LINKNAME}"
exit
fi
fi
#
# Get the true directory path.
#
DIR=`cd ${DIR}; ${PWD_CMD}`
#
# If we were only given a directory name, then return
# its true path.
#
if [ -z "${FNAME}" ]; then
echo "${DIR}"
exit
fi
#
# Now we loop round while we have a link.
#
RKHLINKCOUNT=0
ORIGLINK="${LINKNAME}"
while test -h "${DIR}/${FNAME}"; do
#
# Get the link directory, and the target.
#
LINKNAME="${DIR}"
FNAME=`ls -ld "${DIR}/${FNAME}" | awk '{ print $NF }'`
#
# If the target is just a filename, then we
# prepend the link directory path. If it isn't
# just a filename, then we have a pathname. That
# now becomes our new link name.
#
if [ -z "`echo \"${FNAME}\" | grep '^/'`" ]; then
LINKNAME="${LINKNAME}/${FNAME}"
else
LINKNAME="${FNAME}"
fi
#
# Once again, extract the file name and the directory
# path, and then get the real directory path name.
#
FNAME=`echo "${LINKNAME}" | sed -e 's:^.*/\([^/]*\)$:\1:'`
DIR=`echo "${LINKNAME}" | sed -e 's:/[^/]*$::'`
DIR=`cd ${DIR}; ${PWD_CMD}`
RKHLINKCOUNT=`expr ${RKHLINKCOUNT} + 1`
if [ ${RKHLINKCOUNT} -ge 64 ]; then
echo "Too many levels of symbolic links (${RKHLINKCOUNT}): ${ORIGLINK}" >&2
echo "${ORIGLINK}"
exit
fi
done
#
# At this point we have a pathname to a file, which is not
# a link. To ensure we have the true pathname, we once again
# extract the directory.
#
FNAME=`echo "${LINKNAME}" | sed -e 's:^.*/\([^/]*\)$:\1:'`
DIR=`echo "${LINKNAME}" | sed -e 's:/[^/]*$::'`
test -n "${DIR}" && DIR=`cd ${DIR}; ${PWD_CMD}`
echo "${DIR}/${FNAME}"
exit
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