1 #!/bin/sh 2 # dhcpcd client configuration script 3 4 # Handy variables and functions for our hooks to use 5 from="from" 6 signature_base="# Generated by dhcpcd" 7 signature="${signature_base} ${from} ${interface}" 8 signature_base_end="# End of dhcpcd" 9 signature_end="${signature_base_end} ${from} ${interface}" 10 state_dir="/var/run/dhcpcd" 11 12 # Ensure that all arguments are unique 13 uniqify() 14 { 15 local result= 16 17 while [ -n "$1" ]; do 18 case " ${result} " in 19 *" $1 "*);; 20 *) result="${result}${result:+ }$1";; 21 esac 22 shift 23 done 24 echo "${result}" 25 } 26 27 # List interface config files in a dir 28 # We may wish to control the order at some point rather than just lexical 29 list_interfaces() 30 { 31 local x= interfaces= 32 for x in "$1"/*; do 33 [ -e "${x}" ] || continue 34 interfaces="${interfaces}${interfaces:+ }${x##*/}" 35 done 36 echo "${interfaces}" 37 } 38 39 # We normally use sed to extract values using a key from a list of files 40 # but sed may not always be available at the time. 41 key_get_value() 42 { 43 local key="$1" value= x= line= 44 45 shift 46 if type sed >/dev/null 2>&1; then 47 sed -n "s/^${key}//p" $@ 48 else 49 for x; do 50 while read line; do 51 case "${line}" in 52 "${key}"*) echo "${line##${key}}";; 53 esac 54 done < "${x}" 55 done 56 fi 57 } 58 59 # We normally use sed to remove markers from a configuration file 60 # but sed may not always be available at the time. 61 remove_markers() 62 { 63 local m1="$1" m2="$2" x= line= in_marker=0 64 65 shift; shift 66 if type sed >/dev/null 2>&1; then 67 sed "/^${m1}/,/^${m2}/d" $@ 68 else 69 for x; do 70 while read line; do 71 case "${line}" in 72 "${m1}"*) in_marker=1;; 73 "${m2}"*) in_marker=0;; 74 *) [ ${in_marker} = 0 ] && echo "${line}";; 75 esac 76 done < "${x}" 77 done 78 fi 79 } 80 81 # Compare two files 82 # If different, replace first with second otherwise remove second 83 change_file() 84 { 85 if type cmp >/dev/null 2>&1; then 86 cmp -s "$1" "$2" 87 elif type diff >/dev/null 2>&1; then 88 diff -q "$1" "$2" >/dev/null 89 else 90 # Hopefully we're only working on small text files ... 91 [ "$(cat "$1")" = "$(cat "$2")" ] 92 fi 93 if [ $? -eq 0 ]; then 94 rm -f "$2" 95 return 1 96 fi 97 mv -f "$2" "$1" 98 return 0 99 } 100 101 # Save a config file 102 save_conf() 103 { 104 if [ -f "$1" ]; then 105 rm -f "$1"-pre."${interface}" 106 mv -f "$1" "$1"-pre."${interface}" 107 fi 108 } 109 110 # Restore a config file 111 restore_conf() 112 { 113 [ -f "$1"-pre."${interface}" ] || return 1 114 rm -f "$1" 115 mv -f "$1"-pre."${interface}" "$1" 116 } 117 118 119 # We source each script into this one so that scripts run earlier can 120 # remove variables from the environment so later scripts don't see them. 121 # Thus, the user can create their dhcpcd.enter/exit-hook script to configure 122 # /etc/resolv.conf how they want and stop the system scripts ever updating it. 123 for hook in \ 124 @SYSCONFDIR@/dhcpcd.enter-hook \ 125 @HOOKDIR@/* \ 126 @SYSCONFDIR@/dhcpcd.exit-hook 127 do 128 for skip in ${skip_hooks}; do 129 case "${hook}" in 130 */"${skip}") continue 2;; 131 */[0-9][0-9]"-${skip}") continue 2;; 132 */[0-9][0-9]"-${skip}.sh") continue 2;; 133 esac 134 done 135 if [ -f "${hook}" ]; then 136 . "${hook}" 137 fi 138 done 139
