functions.util

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 # A simple print statement
  23 function print() {
  24         local fmt=${1}; shift
  25
  26         printf "${fmt}\n" "$@"
  27 }
  28
  29 # Print a pretty error message
  30 function error() {
  31         echo -e " ${COLOUR_ERROR}ERROR${COLOUR_NORMAL}  : $@" >&2
  32 }
  33
  34 function error_log() {
  35         log ERROR "$@"
  36 }
  37
  38 # Print a pretty warn message
  39 function warning() {
  40         echo -e " ${COLOUR_WARN}WARNING${COLOUR_NORMAL}: $@" >&2
  41 }
  42
  43 function warning_log() {
  44         log WARNING "$@"
  45 }
  46
  47 function listsort() {
  48         local i
  49         for i in $@; do
  50                 echo "${i}"
  51         done | sort | tr '\n' ' '
  52         echo
  53 }
  54
  55 function listmatch() {
  56         local match=${1}
  57         shift
  58
  59         local i
  60         for i in $@; do
  61                 [ "${match}" = "${i}" ] && return ${EXIT_OK}
  62         done
  63
  64         return ${EXIT_ERROR}
  65 }
  66
  67 function listlength() {
  68         local length=0
  69
  70         local i
  71         for i in $@; do
  72                 length=$(( ${length} + 1 ))
  73         done
  74
  75         echo "${length}"
  76 }
  77
  78 # Speedup function to avoid a call of the basename binary
  79 function basename() {
  80         echo "${1##*/}"
  81 }
  82
  83 function enabled() {
  84         local param=${1}
  85
  86         listmatch "${!param}" yes on true 1
  87 }
  88
  89 function mac_generate() {
  90         # Get a bunch of random hex digits
  91         # and remove all dashes from the input.
  92         local random=$(</proc/sys/kernel/random/uuid)
  93         random=${random//-/}
  94         assert isset random
  95
  96         local output
  97
  98         local i o
  99         for i in $(seq 0 5); do
 100                 o="0x${random:0:2}"
 101                 random="${random:2:${#random}}"
 102
 103                 case "${i}" in
 104                         0)
 105                                 # Remove multicast bit
 106                                 # and set address is software assigned
 107                                 o=$(( ${o} & 0xfe ))
 108                                 o=$(( ${o} | 0x02 ))
 109
 110                                 printf -v output "%02x" "${o}"
 111                                 ;;
 112                         *)
 113                                 printf -v output "%s:%02x" "${output}" "${o}"
 114                                 ;;
 115                 esac
 116         done
 117
 118         # Check if output is valid
 119         assert mac_is_valid ${output}
 120
 121         echo "${output}"
 122 }
 123
 124 function mac_format() {
 125         local mac=${1}
 126
 127         local output
 128
 129         if [ "${#mac}" = "12" ]; then
 130                 # Add colons (:) to mac address
 131                 output=${mac:0:2}
 132                 local i
 133                 for i in 2 4 6 8 10; do
 134                         output="${output}:${mac:${i}:2}"
 135                 done
 136         fi
 137
 138         assert mac_is_valid ${output}
 139
 140         echo "${output}"
 141 }
 142
 143 function mac_is_valid() {
 144         local mac=${1}
 145
 146         [[ ${mac} =~ ^([0-9a-f]{2}\:){5}[0-9a-f]{2}$ ]]
 147 }
 148
 149 function uuid() {
 150         echo $(</proc/sys/kernel/random/uuid)
 151 }
 152
 153 function isset() {
 154         local var=${1}
 155
 156         [ -n "${!var}" ]
 157 }
 158
 159 function isoneof() {
 160         local var=${!1}
 161         shift
 162
 163         listmatch "${var}" "$@"
 164 }
 165
 166 function isbool() {
 167         local var=${1}
 168
 169         isoneof ${var} 0 1 no yes on off
 170 }
 171
 172 function isinteger() {
 173         local var=${!1}
 174
 175         [[ ${var} =~ ^[0-9]+$ ]]
 176 }
 177
 178 function ismac() {
 179         local mac=${!1}
 180
 181         mac_is_valid ${mac}
 182 }
 183
 184 function backtrace() {
 185         local start=1
 186
 187         echo # Empty line
 188         error_log "Backtrace (most recent call in first line):"
 189
 190         local i
 191         for i in $(seq ${start} ${#BASH_SOURCE[*]}); do
 192                 [ -z "${FUNCNAME[${i}]}" ] && continue
 193                 [ "${FUNCNAME[${i}]}" == "main" ] && continue
 194
 195                 error_log "  $(printf "%20s" "'${FUNCNAME[${i}]}'") called from ${BASH_SOURCE[$(( ${i} + 1 ))]}:${BASH_LINENO[${i}]}"
 196         done
 197 }
 198
 199 function assert() {
 200         local assertion="$@"
 201
 202         if ! ${assertion}; then
 203                 error_log "Assertion '${assertion}' failed."
 204                 backtrace
 205                 exit ${EXIT_ERROR}
 206         fi
 207
 208         return ${EXIT_OK}
 209 }
 210
 211 function exec_cmd() {
 212         local cmd=$@
 213
 214         log DEBUG "Running command: ${cmd}"
 215
 216         DEBUG=${DEBUG} \
 217         LOG_DISABLE_STDOUT="${LOG_DISABLE_STDOUT}" \
 218         LOG_FACILITY="${LOG_FACILITY}" \
 219                 ${SHELL} ${cmd}
 220         local ret=$?
 221
 222         #log DEBUG "Returned with code '${ret}'"
 223
 224         if [ ${ret} -eq ${EXIT_ERROR_ASSERT} ]; then
 225                 error_log "Stopping parent process due to assertion error in child process: ${cmd}"
 226                 exit ${EXIT_ERROR_ASSERT}
 227         fi
 228
 229         return ${ret}
 230 }
 231
 232 function cmd() {
 233         local cmd=$@
 234
 235         log DEBUG "Running command: ${cmd}"
 236
 237         ${cmd}
 238         local ret=$?
 239
 240         log DEBUG "Returned with code '${ret}'"
 241
 242         return ${ret}
 243 }
 244
 245 function cmd_quiet() {
 246         cmd $@ &>/dev/null
 247 }
 248
 249 function seq() {
 250         if [ $# -eq 2 ]; then
 251                 eval echo {${1}..${2}}
 252         elif [ $# -eq 3 ]; then
 253                 eval echo {${1}..${3}..${2}}
 254         fi
 255 }
 256
 257 function beautify_time() {
 258         local value=${1}
 259
 260         local unit
 261         local limit
 262         for unit in s m h d w; do
 263                 case "${unit}" in
 264                         s|m|h)
 265                                 limit=60
 266                                 ;;
 267                         d)
 268                                 limit=24
 269                                 ;;
 270                         w)
 271                                 limit=7
 272                                 ;;
 273                 esac
 274
 275                 [ ${value} -lt ${limit} ] && break
 276
 277                 value=$(( ${value} / ${limit} ))
 278         done
 279
 280         echo "${value}${unit}"
 281 }
 282
 283 function beautify_bytes() {
 284         local value=${1}
 285
 286         local unit
 287         local limit=1024
 288         for unit in B k M G T; do
 289                 [ ${value} -lt ${limit} ] && break
 290                 value=$(( ${value} / ${limit} ))
 291         done
 292
 293         echo "${value}${unit}"
 294 }
 295
 296 function module_load() {
 297         local module=${1}
 298
 299         if ! grep -q "^${module}" /proc/modules; then
 300                 log DEBUG "Loading module '${module}'."
 301                 modprobe ${module}
 302         fi
 303 }
 304
 305 function binary_exists() {
 306         local binary=${1}
 307
 308         if [ -n "$(type -p ${binary})" ]; then
 309                 return ${EXIT_OK}
 310         fi
 311
 312         return ${EXIT_ERROR}
 313 }
 314
 315 function process_kill() {
 316         local process=${1}
 317
 318         if ! isinteger process; then
 319                 process=$(pidof ${process})
 320         fi
 321
 322         local pid
 323         local sig
 324         for pid in ${process}; do
 325                 for sig in 15 9; do
 326                         [ -d "/proc/${pid}" ] || break
 327
 328                         kill -${sig} ${pid}
 329                         sleep 1
 330                 done
 331         done
 332 }
 333
 334 function dec() {
 335         local hex=${1}
 336
 337         if [ "${hex:0:2}" != "0x" ]; then
 338                 hex="0x${hex}"
 339         fi
 340
 341         printf "%d\n" "${hex}"
 342 }
 343
 344 function network_is_running() {
 345         # Check, if the network service is running.
 346         service_is_active network
 347 }