#!/bin/sh

run() {
  printf '$ \x1b[32;1m%s\x1b[0m\n' "$*"
  "$@"
}
step() {
  printf '\x1b[34;1m>> %s\x1b[0m\n' "$*"
}

getval() {
  /usr/local/bin/config.awk /config/inet2.conf "$@"
}

haskey() {
  getval interface | while read -r inter; do
    if getval "interface $inter" "$1"; then
      echo "true"
      return
    fi
  done
}

# ensure the /run/inet2 directory is empty (docker doesn't mount tmpfs to /run)
# /run/inet2 is used for storage during runtime - restarting the container should clear it
rm -rf /run/inet2 2>/dev/null
mkdir /run/inet2

# ensure the /var/lib/inet2 directory exists
# /var/lib/inet2 is used for storage for the entire lifetime of the container - restarting the container shouldn't clear it
if [ ! -d /var/lib/inet2 ]; then
  mkdir -p /var/lib/inet2
fi

# these are disabled in the docker netns
step "Enabling IPv6"
run sysctl net.ipv6.conf.all.disable_ipv6=0 net.ipv6.conf.default.disable_ipv6=0 net.ipv6.conf.all.forwarding=1

ospf="$(haskey OSPF)"

escapebird() {
    sed -e 's/\\/\\\\/g;s/"/\\"/g'
}

if [ -n "$ospf" ]; then
  step "Creating Bird configuration"
  
  touch /var/log/bird.log
  chown bird:bird /var/log/bird.log

  selfas=$(getval AS)
  (
    cat <<EOF
log "/var/log/bird.log" all;

$(getval RouterID | while read -r line; do echo "router id $line;"; done)

protocol kernel {
  ipv4 { export all; };
}

protocol kernel {
  ipv6 { export all; };
}

protocol device {
}

protocol direct {
  ipv4;
  ipv6;
}

protocol static {
  ipv4;
}

EOF
    if [ -n "$ospf" ]; then
      interfacelist=$(
        echo "  area 0 {"
        echo "    interface \"lo\" { stub; };"
        getval interface | while read -r inter; do
          val="$(getval "interface $inter" OSPF)"
          if [ "$?" = "0" ]; then
            echo "    interface \"$(printf "%s" "$inter" | escapebird)\" {"
            echo "      type ptp;"
            if [ -n "$val" ]; then
              echo "      $val;";
            fi
            echo "    };"
          fi
        done
        echo "  };"
      )

      cat <<EOF
protocol ospf v3 ospf4 {
  ipv4 {
    import all;
    export filter { if source ~ [RTS_DEVICE, RTS_INHERIT] && net ~ [$(getval "Subnet" | grep -v ':' | while read -r line; do printf "%s+," "$line"; done | sed 's/,$//')] then accept; else reject; };
  };
$interfacelist
}
protocol ospf v3 ospf6 {
  ipv6 {
    import all;
    export filter { if source ~ [RTS_DEVICE, RTS_INHERIT] && net ~ [$(getval "Subnet" | grep ':' | while read -r line; do printf "%s+," "$line"; done | sed 's/,$//')] then accept; else reject; };
  };
$interfacelist
}
EOF
    fi  
) > /etc/bird.conf

  chown root:bird /etc/bird.conf
  chmod 640 /etc/bird.conf
  
  step "Enabling BIRD"
  run rc-update add bird
fi

if [ ! -f /var/lib/inet2/setupDone ]; then
  if [ -f /config/setup.sh ]; then
    step "Running /config/setup.sh"
    /config/setup.sh
  fi
  touch /var/lib/inet2/setupDone
fi

if [ -f /config/start.sh ]; then
  step "Running /config/start.sh"
  /config/start.sh
fi

if [ "$#" = "0" ]; then
  step "Starting OpenRC"
  rm -rf /run/openrc 2>/dev/null
  mkdir /run/openrc
  touch /run/openrc/softlevel
  exec /sbin/openrc
else
  "$@"
fi