iankelling.org Git - automated-distro-installer/blob - fai/config/distro-install-common/ethusb-static

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23 # usage $0 [-c] [off]
  24 # off:   Turn off static ip.
  25 # -c    config only, don't tell networkmanager to change anything
  26 # -f    force interface reup
  27
  28 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
  29 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  30 set -eE -o pipefail
  31 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  32
  33 m() { printf "%s\n" "$*";  "$@"; }
  34
  35 ## begin arg parsing ##
  36
  37 force=false
  38 off=false
  39 while [[ $1 ]]; do
  40   case $1 in
  41     -f)
  42       force=true
  43       ;;
  44     off)
  45       off=true
  46       ;;
  47     *)
  48       echo "$0: error unexpected argument: $1" >&2
  49       exit 1
  50       ;;
  51   esac
  52   shift
  53 done
  54
  55 ## end arg parsing ##
  56
  57
  58 shopt -s nullglob
  59
  60 wiredx=1
  61
  62 # device that has an eth0, but we aren't using it because it is
  63 # broken. We could just hardcode a mac comparison with `cat
  64 # /sys/class/net/eth0/address` but this is cooler.
  65 if [[ -e  /sys/class/net/eth0 ]]; then
  66   bus_info=$(ethtool -i eth0 | awk '$1 == "bus-info:" { print $2 }')
  67   if [[ $bus_info != usb* ]]; then
  68     wiredx=2
  69   fi
  70 fi
  71
  72 eth_dev=eth$(( wiredx - 1 ))
  73
  74 nm_con=$(nmcli device show $eth_dev | \
  75            awk '$1 == "GENERAL.CONNECTION:" {out=$2; for(i=3;i<=NF;i++){out=out" "$i}; print out}' ||:)
  76
  77 if [[ ! $nm_con ]]; then
  78   nm_con="Wired connection $wiredx"
  79 fi
  80
  81
  82 con_exists=false
  83 if nmcli con | grep -q "^$nm_con " &>/dev/null; then
  84   con_exists=true
  85 fi
  86
  87 declare -a args
  88 if $off; then
  89
  90   if ! $con_exists; then
  91     echo "warning: no existing connection: $nm_con found in output of nmcli con"
  92     exit 0
  93   fi
  94
  95
  96   tmpstr=$(nmcli con show "$nm_con" 2>/dev/null | sort -r | awk '$1 == "ipv4.method:" || $1 == "ipv4.addresses:" || $1 == "ipv4.gateway:" || $1 == "ipv4.dns:" || $1 == "GENERAL.STATE:" {print $2}' )
  97   {
  98     read -r ipv4_method
  99     read -r ipv4_gateway
 100     read -r ipv4_dns
 101     read -r ipv4_addresses
 102     read -r state
 103   }<<<"$tmpstr"
 104
 105   reup=false
 106   if [[ $state == activated ]]; then
 107     reup=true
 108   fi
 109
 110   if [[ $ipv4_method != auto ]]; then
 111     args+=(ipv4.method auto)
 112   fi
 113   if [[ $ipv4_addresses != -- ]]; then
 114     args+=(-ipv4.addresses "$ipv4_addresses")
 115   fi
 116   if [[ $ipv4_dns != -- ]]; then
 117     args+=(-ipv4.dns "$ipv4_dns")
 118   fi
 119   if [[ $ipv4_gateway != -- ]]; then
 120     # undocumented in t11 man nmcli. guessed randomly
 121     args+=(ipv4.gateway 0.0.0.0)
 122   fi
 123   if (( ${#args[@]} >= 1 )); then
 124     m nmcli con mod "$nm_con" "${args[@]}"
 125     if $reup; then
 126       m nmcli con up "$nm_con"
 127     fi
 128   else
 129     echo "$0: found expected state, nothing to do."
 130   fi
 131   exit 0
 132 fi
 133
 134
 135 if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
 136      && ip n show 10.2.0.1 | grep . &>/dev/null; then
 137   #  we are at_home=true
 138
 139   while read -r ip_suf host mac; do
 140     if [[ ! $ip_suf || $ip_suf == \#* ]]; then
 141       continue
 142     fi
 143     if [[ $mac != usb ]]; then
 144       continue
 145     fi
 146     if [[ $host == ${HOSTNAME}c ]]; then
 147
 148       ip=10.2.0.$ip_suf/16
 149       gateway=10.2.0.1
 150       dns=8.8.8.4,8.8.8.8
 151       break
 152     fi
 153   done </p/c/host-info
 154
 155   if [[ ! $ip_suf ]]; then
 156     echo "$0: error: failed to find ${HOSTNAME}c ip suffix in /p/c/host-info"
 157     exit 1
 158   fi
 159 else
 160   if ! type -p dig &>/dev/null; then
 161     apt-get install dig
 162   fi
 163   myip=$(dig +short @192.168.0.25 $HOSTNAME.office.fsf.org)
 164   if [[ ! $ip ]]; then
 165     echo "$0: error: didnt detect home network and failed to get office ip"
 166     exit 1
 167   fi
 168   dns=192.168.0.10,192.168.0.25
 169   gateway=192.168.0.1
 170   ip=$myip/24
 171 fi
 172
 173 if ! $force && $con_exists; then
 174   current=$(nmcli con show "$nm_con" 2>/dev/null | sort -r | awk '$1 == "ipv4.method:" || $1 == "ipv4.addresses:" || $1 == "ipv4.gateway:" || $1 == "ipv4.dns:" {print $2}')
 175   expected="manual
 176 $gateway
 177 $dns
 178 $ip"
 179   if [[ $current == "$expected" ]]; then
 180     echo "$0: found expected state, nothing to do."
 181     exit 0
 182   fi
 183 fi
 184
 185 m nmcli con mod 'Wired connection 1' ipv4.method manual ipv4.addresses $ip ipv4.gateway $gateway ipv4.dns $dns
 186
 187 state=$(nmcli con show "$nm_con" 2>/dev/null | awk '$1 == "GENERAL.STATE:" {print $2}')
 188 if [[ $state == activated ]]; then
 189   m nmcli con up "$nm_con"
 190 fi
 191
 192
 193 # example of down cli
 194 #nmcli con mod 'Wired connection 1' ipv4.method auto -ipv4.addresses 10.2.0.9/16 ipv4.gateway 0.0.0.0 -ipv4.dns "8.8.8.4,8.8.8.8"
 195
 196
 197 # FYI: the result of running, for example
 198 # nmcli con mod "Wired connection 1" \
 199   #         ipv4.method manual \
 200   #       ipv4.addresses "10.2.0.23/24" \
 201   #       ipv4.gateway "10.2.0.1" \
 202   #       ipv4.dns "8.8.8.4,8.8.8.8"
 203
 204 # creates a fille named "/etc/NetworkManager/system-connections/Wired connection 1.nmconnection",
 205 # below.
 206 #
 207 # The nmcli man page says you should just edit files in that dir and
 208 # then run nmcli con reload to reread them all to load your changes, but
 209 # I've found that to be unreliable, the systemd journal would say
 210 # something like "reload happened" then nothing would change in the
 211 # connect that the file clearly modifies, so I switched over to using
 212 # the command line and just ignoring those files.
 213 #
 214 # I see no reason to keep the same file name, or a bunch of
 215 # setting that seem irrelevant, and empty sections don't seem to do
 216 # anything according to the man page.
 217 #
 218
 219 # [connection]
 220 # id=Wired connection 1
 221 # uuid=b0fb7694-dfe6-31a1-81fa-7c17b61515a7
 222 # type=ethernet
 223 # interface-name=eth1
 224 # timestamp=1715728264
 225
 226 # [ethernet]
 227
 228 # [ipv4]
 229 # address1=10.2.0.23/16,10.2.0.1
 230 # dns=8.8.8.4;8.8.8.8;
 231 # method=manual
 232
 233 # [ipv6]
 234 # addr-gen-mode=stable-privacy
 235 # method=auto
 236
 237 # [proxy]