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 $0 [-c] [off]
  24 # off:   Turn off static ip.
  25 # -c    config only, don't tell networkmanager to change anything
  26 # -f    force interface reup
  27
  28 # shellcheck disable=SC2317 # false positive
  29
  30 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
  31 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  32 set -eE -o pipefail
  33 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  34
  35 m() { printf "%s\n" "$*";  "$@"; }
  36
  37
  38 set-dynamic() {
  39
  40   reup=false
  41   if [[ $cur_state == activated ]]; then
  42     reup=true
  43   fi
  44
  45   if [[ $cur_method != auto ]]; then
  46     args+=(ipv4.method auto)
  47   fi
  48   if [[ $cur_ip != -- ]]; then
  49     args+=(-ipv4.addresses "$ipv4_addresses")
  50   fi
  51   if [[ $cur_dns != -- ]]; then
  52     args+=(-ipv4.dns "$ipv4_dns")
  53   fi
  54   if [[ $cur_gateway != -- ]]; then
  55     # undocumented in t11 man nmcli. guessed randomly
  56     args+=(ipv4.gateway 0.0.0.0)
  57   fi
  58   if (( ${#args[@]} >= 1 )); then
  59     m nmcli con mod "$nm_con" "${args[@]}"
  60     if $reup; then
  61       m nmcli con up "$nm_con"
  62     fi
  63   else
  64     echo "$0: found expected state, nothing to do."
  65   fi
  66   exit 0
  67   set-nm
  68 }
  69
  70 detect-net() {
  71
  72   # this assumes we have wifi up
  73   if [[ $(timeout 1 dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
  74        && ip n show 10.2.0.1 | grep . &>/dev/null; then
  75     net=home
  76   elif ip r show default | grep 'via 10.0.3.1 dev wlan0' &>/dev/null && [[ $(timeout 1 dig +short @10.0.3.1 -x 10.0.3.1) == cmc1.lan. ]]; then
  77     net=work
  78   else
  79     echo "$0: error could not detect network"
  80     exit 1
  81   fi
  82
  83 }
  84
  85 set-nm() {
  86   m nmcli con mod "$nm_con" ipv4.method manual ipv4.addresses $ip ipv4.gateway $gateway ipv4.dns $dns
  87   state=$(nmcli con show "$nm_con" 2>/dev/null | awk '$1 == "GENERAL.STATE:" {print $2}')
  88   if [[ $state == activated ]]; then
  89     m nmcli con up "$nm_con"
  90   fi
  91
  92 }
  93
  94 get-ip() {
  95
  96   case $net in
  97     home)
  98
  99       while read -r ip_suf host mac; do
 100         if [[ ! $ip_suf || $ip_suf == \#* ]]; then
 101           continue
 102         fi
 103         if [[ $mac != usb ]]; then
 104           continue
 105         fi
 106         if [[ $host == ${HOSTNAME}c ]]; then
 107
 108           ip=10.2.0.$ip_suf/16
 109           gateway=10.2.0.1
 110           dns=8.8.8.4,8.8.8.8
 111           break
 112         fi
 113       done </p/c/host-info
 114
 115       if [[ ! $ip_suf ]]; then
 116         echo "$0: error: failed to find ${HOSTNAME}c ip suffix in /p/c/host-info"
 117         exit 1
 118       fi
 119       ;;
 120     work)
 121
 122       if ! ip r show default | grep 'via 192.168.0.1 dev eth' &>/dev/null; then
 123         if [[ $cur_method != manual ]]; then
 124           echo "$0: error. Need to be on wired network to get our ip"
 125           exit 1
 126         fi
 127         set-dynamic
 128         sleep 10
 129       fi
 130       myip=$(timeout 1 dig +short @192.168.0.25 $HOSTNAME.office.fsf.org)
 131       if [[ ! $myip ]]; then
 132         echo "$0: error: didnt detect home network and failed to get office ip"
 133         exit 1
 134       fi
 135       dns=192.168.0.10,192.168.0.25
 136       gateway=192.168.0.1
 137       ip=$myip/24
 138
 139       ;;
 140   esac
 141 }
 142
 143
 144 get-cur-val() {
 145   local key
 146   key=$1
 147   printf "%s\n" "$tmpstr" | awk '$1 == "'$key':" {print $2}'
 148 }
 149
 150 get-cur() {
 151   tmpstr=$(nmcli con show "$nm_con" 2>/dev/null)
 152
 153   cur_method=$(get-cur-val ipv4.method)
 154   cur_ip=$(get-cur-val ipv4.addresses)
 155   cur_gateway=$(get-cur-val ipv4.gateway)
 156   cur_dns=$(get-cur-val ipv4.dns)
 157   cur_state=$(get-cur-val GENERAL.STATE)
 158 }
 159
 160
 161 ## begin arg parsing ##
 162
 163 force=false
 164 off=false
 165 while [[ $1 ]]; do
 166   case $1 in
 167     -f)
 168       force=true
 169       ;;
 170     off)
 171       off=true
 172       ;;
 173     *)
 174       echo "$0: error unexpected argument: $1" >&2
 175       exit 1
 176       ;;
 177   esac
 178   shift
 179 done
 180
 181 ## end arg parsing ##
 182
 183 ## begin common setup / detection ##
 184 shopt -s nullglob
 185
 186 wiredx=1
 187 declare -a args
 188
 189 # device that has an eth0, but we aren't using it because it is
 190 # broken. We could just hardcode a mac comparison with `cat
 191 # /sys/class/net/eth0/address` but this is cooler.
 192 if [[ -e  /sys/class/net/eth0 ]]; then
 193   bus_info=$(ethtool -i eth0 | awk '$1 == "bus-info:" { print $2 }')
 194   if [[ $bus_info != usb* ]]; then
 195     wiredx=2
 196   fi
 197 fi
 198
 199 eth_dev=eth$(( wiredx - 1 ))
 200
 201 nm_con=$(nmcli device show $eth_dev | \
 202            awk '$1 == "GENERAL.CONNECTION:" {out=$2; for(i=3;i<=NF;i++){out=out" "$i}; print out}' ||:)
 203
 204 if [[ ! $nm_con || $nm_con == -- ]]; then
 205   nm_con="Wired connection $wiredx"
 206 fi
 207
 208 if ! nmcli con | grep -q "^$nm_con " &>/dev/null; then
 209   # Note: we could support creation through a file or via
 210   # nmcli, but right now I'm ok with just having plugged in a device once
 211   # since this os was installed.
 212   echo "error: no existing connection: $nm_con found in output of nmcli con"
 213   exit 0
 214 fi
 215
 216
 217 if ! type -p dig &>/dev/null; then
 218   apt-get -y install dig
 219 fi
 220
 221 if ! type -p ethtool &>/dev/null; then
 222   apt-get -y install ethtool
 223 fi
 224
 225
 226 get-cur
 227 ## end common setup / detection ##
 228
 229 if $off; then
 230   set-dynamic
 231   exit 0
 232 fi
 233
 234 detect-net
 235 get-ip
 236
 237 if ! $force && [[ "$cur_method $cur_gateway $cur_dns $cur_ip" == "manual $gateway $dns $ip" ]]; then
 238   echo "$0: found expected state, nothing to do."
 239   exit 0
 240 fi
 241
 242 set-nm
 243
 244
 245
 246 # example of down cli
 247 #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"
 248
 249
 250 # FYI: the result of running, for example
 251 # nmcli con mod "Wired connection 1" \
 252   #         ipv4.method manual \
 253   #       ipv4.addresses "10.2.0.23/24" \
 254   #       ipv4.gateway "10.2.0.1" \
 255   #       ipv4.dns "8.8.8.4,8.8.8.8"
 256
 257 # creates a fille named "/etc/NetworkManager/system-connections/Wired connection 1.nmconnection",
 258 # below.
 259 #
 260 # The nmcli man page says you should just edit files in that dir and
 261 # then run nmcli con reload to reread them all to load your changes, but
 262 # I've found that to be unreliable, the systemd journal would say
 263 # something like "reload happened" then nothing would change in the
 264 # connect that the file clearly modifies, so I switched over to using
 265 # the command line and just ignoring those files.
 266 #
 267 # I see no reason to keep the same file name, or a bunch of
 268 # setting that seem irrelevant, and empty sections don't seem to do
 269 # anything according to the man page.
 270 #
 271
 272 # [connection]
 273 # id=Wired connection 1
 274 # uuid=b0fb7694-dfe6-31a1-81fa-7c17b61515a7
 275 # type=ethernet
 276 # interface-name=eth1
 277 # timestamp=1715728264
 278
 279 # [ethernet]
 280
 281 # [ipv4]
 282 # address1=10.2.0.23/16,10.2.0.1
 283 # dns=8.8.8.4;8.8.8.8;
 284 # method=manual
 285
 286 # [ipv6]
 287 # addr-gen-mode=stable-privacy
 288 # method=auto
 289
 290 # [proxy]