Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | #!/bin/sh |
| 2 | # dhcpcd client configuration script |
| 3 | |
| 4 | # Handy variables and functions for our hooks to use |
| 5 | case "$reason" in |
| 6 | ROUTERADVERT) |
| 7 | ifsuffix=".ra";; |
| 8 | INFORM6|BOUND6|RENEW6|REBIND6|REBOOT6|EXPIRE6|RELEASE6|STOP6) |
| 9 | ifsuffix=".dhcp6";; |
| 10 | *) |
| 11 | ifsuffix=".dhcp";; |
| 12 | esac |
| 13 | ifname="$interface$ifsuffix${ifclass+.}$ifclass" |
| 14 | |
| 15 | from=from |
| 16 | signature_base="# Generated by dhcpcd" |
| 17 | signature="$signature_base $from $ifname" |
| 18 | signature_base_end="# End of dhcpcd" |
| 19 | signature_end="$signature_base_end $from $ifname" |
| 20 | state_dir=@RUNDIR@/dhcpcd |
| 21 | _detected_init=false |
| 22 | |
| 23 | : ${if_up:=false} |
| 24 | : ${if_down:=false} |
| 25 | : ${syslog_debug:=false} |
| 26 | |
| 27 | # Ensure that all arguments are unique |
| 28 | uniqify() |
| 29 | { |
| 30 | local result= i= |
| 31 | for i do |
| 32 | case " $result " in |
| 33 | *" $i "*);; |
| 34 | *) result="$result $i";; |
| 35 | esac |
| 36 | done |
| 37 | echo "${result# *}" |
| 38 | } |
| 39 | |
| 40 | # List interface config files in a directory. |
| 41 | # If dhcpcd is running as a single instance then it will have a list of |
| 42 | # interfaces in the preferred order. |
| 43 | # Otherwise we just use what we have. |
| 44 | list_interfaces() |
| 45 | { |
| 46 | local i= x= ifaces= |
| 47 | for i in $interface_order; do |
| 48 | for x in "$1"/$i.*; do |
| 49 | [ -f "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}" |
| 50 | done |
| 51 | done |
| 52 | for x in "$1"/*; do |
| 53 | [ -f "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}" |
| 54 | done |
| 55 | uniqify $ifaces |
| 56 | } |
| 57 | |
| 58 | # Trim function |
| 59 | trim() |
| 60 | { |
| 61 | local var="$*" |
| 62 | |
| 63 | var=${var#"${var%%[![:space:]]*}"} |
| 64 | var=${var%"${var##*[![:space:]]}"} |
| 65 | if [ -z "$var" ]; then |
| 66 | # So it seems our shell doesn't support wctype(3) patterns |
| 67 | # Fall back to sed |
| 68 | var=$(echo "$*" | sed -e 's/^[[:space:]]*//;s/[[:space:]]*$//') |
| 69 | fi |
| 70 | printf %s "$var" |
| 71 | } |
| 72 | |
| 73 | # We normally use sed to extract values using a key from a list of files |
| 74 | # but sed may not always be available at the time. |
| 75 | key_get_value() |
| 76 | { |
| 77 | local key="$1" value= x= line= |
| 78 | |
| 79 | shift |
| 80 | if type sed >/dev/null 2>&1; then |
| 81 | sed -n "s/^$key//p" $@ |
| 82 | else |
| 83 | for x do |
| 84 | while read line; do |
| 85 | case "$line" in |
| 86 | "$key"*) echo "${line##$key}";; |
| 87 | esac |
| 88 | done < "$x" |
| 89 | done |
| 90 | fi |
| 91 | } |
| 92 | |
| 93 | # We normally use sed to remove markers from a configuration file |
| 94 | # but sed may not always be available at the time. |
| 95 | remove_markers() |
| 96 | { |
| 97 | local m1="$1" m2="$2" x= line= in_marker=0 |
| 98 | |
| 99 | shift; shift |
| 100 | if type sed >/dev/null 2>&1; then |
| 101 | sed "/^$m1/,/^$m2/d" $@ |
| 102 | else |
| 103 | for x do |
| 104 | while read line; do |
| 105 | case "$line" in |
| 106 | "$m1"*) in_marker=1;; |
| 107 | "$m2"*) in_marker=0;; |
| 108 | *) [ $in_marker = 0 ] && echo "$line";; |
| 109 | esac |
| 110 | done < "$x" |
| 111 | done |
| 112 | fi |
| 113 | } |
| 114 | |
| 115 | # Compare two files. |
| 116 | comp_file() |
| 117 | { |
| 118 | |
| 119 | [ -e "$1" ] || return 1 |
| 120 | [ -e "$2" ] || return 1 |
| 121 | |
| 122 | if type cmp >/dev/null 2>&1; then |
| 123 | cmp -s "$1" "$2" |
| 124 | elif type diff >/dev/null 2>&1; then |
| 125 | diff -q "$1" "$2" >/dev/null |
| 126 | else |
| 127 | # Hopefully we're only working on small text files ... |
| 128 | [ "$(cat "$1")" = "$(cat "$2")" ] |
| 129 | fi |
| 130 | } |
| 131 | |
| 132 | # Compare two files. |
| 133 | # If different, replace first with second otherwise remove second. |
| 134 | change_file() |
| 135 | { |
| 136 | |
| 137 | if [ -e "$1" ]; then |
| 138 | if comp_file "$1" "$2"; then |
| 139 | rm -f "$2" |
| 140 | return 1 |
| 141 | fi |
| 142 | fi |
| 143 | cat "$2" > "$1" |
| 144 | rm -f "$2" |
| 145 | return 0 |
| 146 | } |
| 147 | |
| 148 | # Compare two files. |
| 149 | # If different, copy or link depending on target type |
| 150 | copy_file() |
| 151 | { |
| 152 | |
| 153 | if [ -h "$2" ]; then |
| 154 | [ "$(readlink "$2")" = "$1" ] && return 1 |
| 155 | ln -sf "$1" "$2" |
| 156 | else |
| 157 | comp_file "$1" "$2" && return 1 |
| 158 | cat "$1" >"$2" |
| 159 | fi |
| 160 | } |
| 161 | |
| 162 | # Save a config file |
| 163 | save_conf() |
| 164 | { |
| 165 | |
| 166 | if [ -f "$1" ]; then |
| 167 | rm -f "$1-pre.$interface" |
| 168 | cat "$1" > "$1-pre.$interface" |
| 169 | fi |
| 170 | } |
| 171 | |
| 172 | # Restore a config file |
| 173 | restore_conf() |
| 174 | { |
| 175 | |
| 176 | [ -f "$1-pre.$interface" ] || return 1 |
| 177 | cat "$1-pre.$interface" > "$1" |
| 178 | rm -f "$1-pre.$interface" |
| 179 | } |
| 180 | |
| 181 | # Write a syslog entry |
| 182 | syslog() |
| 183 | { |
| 184 | local lvl="$1" |
| 185 | |
| 186 | if [ "$lvl" = debug ]; then |
| 187 | ${syslog_debug} || return 0 |
| 188 | fi |
| 189 | [ -n "$lvl" ] && shift |
| 190 | [ -n "$*" ] || return 0 |
| 191 | case "$lvl" in |
| 192 | err|error) echo "$interface: $*" >&2;; |
| 193 | *) echo "$interface: $*";; |
| 194 | esac |
| 195 | if type logger >/dev/null 2>&1; then |
| 196 | logger -i -p daemon."$lvl" -t dhcpcd-run-hooks "$interface: $*" |
| 197 | fi |
| 198 | } |
| 199 | |
| 200 | # Check for a valid domain name as per RFC1123 with the exception of |
| 201 | # allowing - and _ as they seem to be widely used. |
| 202 | valid_domainname() |
| 203 | { |
| 204 | local name="$1" label |
| 205 | |
| 206 | [ -z "$name" -o ${#name} -gt 255 ] && return 1 |
| 207 | |
| 208 | while [ -n "$name" ]; do |
| 209 | label="${name%%.*}" |
| 210 | [ -z "$label" -o ${#label} -gt 63 ] && return 1 |
| 211 | case "$label" in |
| 212 | -*|_*|*-|*_) return 1;; |
| 213 | # some sh require - as the first or last character in the class |
| 214 | # when matching it |
| 215 | *[![:alnum:]_-]*) return 1;; |
| 216 | esac |
| 217 | [ "$name" = "${name#*.}" ] && break |
| 218 | name="${name#*.}" |
| 219 | done |
| 220 | return 0 |
| 221 | } |
| 222 | |
| 223 | valid_domainname_list() |
| 224 | { |
| 225 | local name |
| 226 | |
| 227 | for name do |
| 228 | valid_domainname "$name" || return $? |
| 229 | done |
| 230 | return 0 |
| 231 | } |
| 232 | |
| 233 | # Check for a valid path |
| 234 | valid_path() |
| 235 | { |
| 236 | |
| 237 | case "$@" in |
| 238 | *[![:alnum:]#%+-_:\.,@~\\/\[\]=\ ]*) return 1;; |
| 239 | esac |
| 240 | return 0 |
| 241 | } |
| 242 | |
| 243 | # With the advent of alternative init systems, it's possible to have |
| 244 | # more than one installed. So we need to try and guess what one we're |
| 245 | # using unless overriden by configure. |
| 246 | detect_init() |
| 247 | { |
| 248 | _service_exists="@SERVICEEXISTS@" |
| 249 | _service_cmd="@SERVICECMD@" |
| 250 | _service_status="@SERVICESTATUS@" |
| 251 | |
| 252 | [ -n "$_service_cmd" ] && return 0 |
| 253 | |
| 254 | if ${_detected_init}; then |
| 255 | [ -n "$_service_cmd" ] |
| 256 | return $? |
| 257 | fi |
| 258 | |
| 259 | # Detect the running init system. |
| 260 | # As systemd and OpenRC can be installed on top of legacy init |
| 261 | # systems we try to detect them first. |
| 262 | _service_status= |
| 263 | if [ -x /bin/systemctl -a -S /run/systemd/private ]; then |
| 264 | _service_exists="/bin/systemctl --quiet is-enabled \$1.service" |
| 265 | _service_status="/bin/systemctl --quiet is-active \$1.service" |
| 266 | _service_cmd="/bin/systemctl \$2 \$1.service" |
| 267 | elif [ -x /usr/bin/systemctl -a -S /run/systemd/private ]; then |
| 268 | _service_exists="/usr/bin/systemctl --quiet is-enabled \$1.service" |
| 269 | _service_status="/usr/bin/systemctl --quiet is-active \$1.service" |
| 270 | _service_cmd="/usr/bin/systemctl \$2 \$1.service" |
| 271 | elif [ -x /sbin/rc-service -a \ |
| 272 | -s /libexec/rc/init.d/softlevel -o -s /run/openrc/softlevel ] |
| 273 | then |
| 274 | _service_exists="/sbin/rc-service -e \$1" |
| 275 | _service_cmd="/sbin/rc-service \$1 -- -D \$2" |
| 276 | elif [ -x /usr/sbin/invoke-rc.d ]; then |
| 277 | _service_exists="/usr/sbin/invoke-rc.d --query --quiet \$1 start >/dev/null 2>&1 || [ \$? = 104 ]" |
| 278 | _service_cmd="/usr/sbin/invoke-rc.d \$1 \$2" |
| 279 | elif [ -x /sbin/service ]; then |
| 280 | _service_exists="/sbin/service \$1 >/dev/null 2>&1" |
| 281 | _service_cmd="/sbin/service \$1 \$2" |
| 282 | elif [ -x /bin/sv ]; then |
| 283 | _service_exists="/bin/sv status \1 >/dev/null 2>&1" |
| 284 | _service_cmd="/bin/sv \$1 \$2" |
| 285 | elif [ -x /usr/bin/sv ]; then |
| 286 | _service_exists="/usr/bin/sv status \1 >/dev/null 2>&1" |
| 287 | _service_cmd="/usr/bin/sv \$1 \$2" |
| 288 | elif [ -e /etc/slackware-version -a -d /etc/rc.d ]; then |
| 289 | _service_exists="[ -x /etc/rc.d/rc.\$1 ]" |
| 290 | _service_cmd="/etc/rc.d/rc.\$1 \$2" |
| 291 | _service_status="/etc/rc.d/rc.\$1 status 1>/dev/null 2>&1" |
| 292 | else |
| 293 | for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do |
| 294 | if [ -d $x ]; then |
| 295 | _service_exists="[ -x $x/\$1 ]" |
| 296 | _service_cmd="$x/\$1 \$2" |
| 297 | break |
| 298 | fi |
| 299 | done |
| 300 | if [ -e /etc/arch-release ]; then |
| 301 | _service_status="[ -e /var/run/daemons/\$1 ]" |
| 302 | elif [ "$x" = "/etc/rc.d" -a -e /etc/rc.d/rc.subr ]; then |
| 303 | _service_status="$x/\$1 check 1>/dev/null 2>&1" |
| 304 | fi |
| 305 | fi |
| 306 | |
| 307 | _detected_init=true |
| 308 | if [ -z "$_service_cmd" ]; then |
| 309 | syslog err "could not detect a useable init system" |
| 310 | return 1 |
| 311 | fi |
| 312 | return 0 |
| 313 | } |
| 314 | |
| 315 | # Check a system service exists |
| 316 | service_exists() |
| 317 | { |
| 318 | |
| 319 | if [ -z "$_service_exists" ]; then |
| 320 | detect_init || return 1 |
| 321 | fi |
| 322 | eval $_service_exists |
| 323 | } |
| 324 | |
| 325 | # Send a command to a system service |
| 326 | service_cmd() |
| 327 | { |
| 328 | |
| 329 | if [ -z "$_service_cmd" ]; then |
| 330 | detect_init || return 1 |
| 331 | fi |
| 332 | eval $_service_cmd |
| 333 | } |
| 334 | |
| 335 | # Send a command to a system service if it is running |
| 336 | service_status() |
| 337 | { |
| 338 | |
| 339 | if [ -z "$_service_cmd" ]; then |
| 340 | detect_init || return 1 |
| 341 | fi |
| 342 | if [ -n "$_service_status" ]; then |
| 343 | eval $_service_status |
| 344 | else |
| 345 | service_command $1 status >/dev/null 2>&1 |
| 346 | fi |
| 347 | } |
| 348 | |
| 349 | # Handy macros for our hooks |
| 350 | service_command() |
| 351 | { |
| 352 | |
| 353 | service_exists $1 && service_cmd $1 $2 |
| 354 | } |
| 355 | service_condcommand() |
| 356 | { |
| 357 | |
| 358 | service_exists $1 && service_status $1 && service_cmd $1 $2 |
| 359 | } |
| 360 | |
| 361 | # We source each script into this one so that scripts run earlier can |
| 362 | # remove variables from the environment so later scripts don't see them. |
| 363 | # Thus, the user can create their dhcpcd.enter/exit-hook script to configure |
| 364 | # /etc/resolv.conf how they want and stop the system scripts ever updating it. |
| 365 | for hook in \ |
| 366 | @SYSCONFDIR@/dhcpcd.enter-hook \ |
| 367 | @HOOKDIR@/* \ |
| 368 | @SYSCONFDIR@/dhcpcd.exit-hook |
| 369 | do |
| 370 | for skip in $skip_hooks; do |
| 371 | case "$hook" in |
| 372 | */*~) continue 2;; |
| 373 | */"$skip") continue 2;; |
| 374 | */[0-9][0-9]"-$skip") continue 2;; |
| 375 | */[0-9][0-9]"-$skip.sh") continue 2;; |
| 376 | esac |
| 377 | done |
| 378 | if [ -f "$hook" ]; then |
| 379 | . "$hook" |
| 380 | fi |
| 381 | done |