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