1#!/bin/sh 2# dhcpcd client configuration script 3 4# Handy variables and functions for our hooks to use 5from=from 6signature_base="# Generated by dhcpcd" 7signature="$signature_base $from $interface" 8signature_base_end="# End of dhcpcd" 9signature_end="$signature_base_end $from $interface" 10state_dir=/var/run/dhcpcd 11 12if_up=false 13if_down=false 14case "$reason" in 15BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT|STATIC) if_up=true;; 16PREINIT|EXPIRE|FAIL|IPV4LL|NAK|NOCARRIER|RELEASE|STOP) if_down=true;; 17esac 18 19# Ensure that all arguments are unique 20uniqify() 21{ 22 local result= i= 23 for i; do 24 case " $result " in 25 *" $i "*);; 26 *) result="$result $i";; 27 esac 28 done 29 echo "${result# *}" 30} 31 32# List interface config files in a directory. 33# If dhcpcd is running as a single instance then it will have a list of 34# interfaces in the preferred order. 35# Otherwise we just use what we have. 36list_interfaces() 37{ 38 local i= x= ifaces= 39 for i in $interface_order; do 40 [ -e "$1/$i" ] && ifaces="$ifaces${ifaces:+ }$i" 41 done 42 for x in "$1"/*; do 43 [ -e "$x" ] || continue 44 for i in $interface_order; do 45 if [ $i = "${x##*/}" ]; then 46 unset x 47 break 48 fi 49 done 50 [ -n "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}" 51 done 52 echo "$ifaces" 53} 54 55# We normally use sed to extract values using a key from a list of files 56# but sed may not always be available at the time. 57key_get_value() 58{ 59 local key="$1" value= x= line= 60 61 shift 62 if type sed >/dev/null 2>&1; then 63 sed -n "s/^$key//p" $@ 64 else 65 for x; do 66 while read line; do 67 case "$line" in 68 "$key"*) echo "${line##$key}";; 69 esac 70 done < "$x" 71 done 72 fi 73} 74 75# We normally use sed to remove markers from a configuration file 76# but sed may not always be available at the time. 77remove_markers() 78{ 79 local m1="$1" m2="$2" x= line= in_marker=0 80 81 shift; shift 82 if type sed >/dev/null 2>&1; then 83 sed "/^$m1/,/^$m2/d" $@ 84 else 85 for x; do 86 while read line; do 87 case "$line" in 88 "$m1"*) in_marker=1;; 89 "$m2"*) in_marker=0;; 90 *) [ $in_marker = 0 ] && echo "$line";; 91 esac 92 done < "$x" 93 done 94 fi 95} 96 97# Compare two files. 98# If different, replace first with second otherwise remove second. 99change_file() 100{ 101 if [ -e "$1" ]; then 102 if type cmp >/dev/null 2>&1; then 103 cmp -s "$1" "$2" 104 elif type diff >/dev/null 2>&1; then 105 diff -q "$1" "$2" >/dev/null 106 else 107 # Hopefully we're only working on small text files ... 108 [ "$(cat "$1")" = "$(cat "$2")" ] 109 fi 110 if [ $? -eq 0 ]; then 111 rm -f "$2" 112 return 1 113 fi 114 fi 115 cat "$2" > "$1" 116 rm -f "$2" 117 return 0 118} 119 120# Save a config file 121save_conf() 122{ 123 if [ -f "$1" ]; then 124 rm -f "$1-pre.$interface" 125 cat "$1" > "$1-pre.$interface" 126 fi 127} 128 129# Restore a config file 130restore_conf() 131{ 132 [ -f "$1-pre.$interface" ] || return 1 133 cat "$1-pre.$interface" > "$1" 134 rm -f "$1-pre.$interface" 135} 136 137# Write a syslog entry 138syslog() 139{ 140 local lvl="$1" 141 142 [ -n "$lvl" ] && shift 143 if [ -n "$*" ]; then 144 if type logger >/dev/null 2>&1; then 145 logger -t dhcpcd -p daemon."$lvl" -s "$*" 146 fi 147 fi 148} 149 150# Check a system service exists 151service_exists() 152{ 153 @SERVICEEXISTS@ 154} 155 156# Send a command to a system service 157service_cmd() 158{ 159 @SERVICECMD@ 160} 161 162# Send a command to a system service if it is running 163service_status() 164{ 165 @SERVICESTATUS@ 166} 167 168# Handy macros for our hooks 169service_command() 170{ 171 service_exists $1 && service_cmd $1 $2 172} 173service_condcommand() 174{ 175 service_exists $1 && service_status $1 && service_cmd $1 $2 176} 177 178# We source each script into this one so that scripts run earlier can 179# remove variables from the environment so later scripts don't see them. 180# Thus, the user can create their dhcpcd.enter/exit-hook script to configure 181# /etc/resolv.conf how they want and stop the system scripts ever updating it. 182for hook in \ 183 @SYSCONFDIR@/dhcpcd.enter-hook \ 184 @HOOKDIR@/* \ 185 @SYSCONFDIR@/dhcpcd.exit-hook 186do 187 for skip in $skip_hooks; do 188 case "$hook" in 189 */"$skip") continue 2;; 190 */[0-9][0-9]"-$skip") continue 2;; 191 */[0-9][0-9]"-$skip.sh") continue 2;; 192 esac 193 done 194 if [ -f "$hook" ]; then 195 . "$hook" 196 fi 197done 198