Scripts to determine network settings

script/host/net/printOwnIPv6Adress.sh

@@ -0,0 +1,109 @@
+#!/bin/bash
+
+#grep -E '(^::1|(^fc.*|^fd.*)|^fe80::.*|^ff.*)' findet:
+#  loopback: ::1/128
+#  uniquelocal: fc00::/7   (fc00… bis fdff…)
+#  linklocal:   fe80::/64
+#  multicast:   ff00::/8   (ff…)
+
+
+
+function all() {
+    # Select just lines containing 'inet6'.
+    # 1.) Remove every indenting.
+    # 2.) Remove 'inet6 '.
+    # 3.) Remove everything after a '/' (including the /).
+    ip -6 addr \
+        | grep 'inet6' \
+        | sed -e 's/^[[:blank:]]*//' \
+            -e 's/inet6 //' \
+            -e 's/\/.*//'
+}
+
+function routed() {
+    local _DEVICE
+    _DEVICE="$(ip -6 route show default | xargs -n 1 | grep -A1 -i dev | tail -n 1)"
+    readonly _DEVICE
+
+    ip -6 addr show dev "${_DEVICE:?"Missing DEVICE"}" scope global \
+        | grep 'inet6' \
+        | xargs -n 1 \
+        | grep -A1 'inet6' \
+        | grep ':' \
+        | cut -d/ -f1
+}
+
+function public() {
+    hostname -I | xargs -n 1 \
+        | grep ':' \
+        | grep -vE '(^::1|(^fc.*|^fd.*)|^fe80::.*|^ff.*)'
+}
+
+# Maybe use "resolvectl status" to get DNS Server and specify 'nslookup'
+function published() {
+    local _BOOT_HOSTNAME
+    _BOOT_HOSTNAME="$(hostname -b)"
+    readonly _BOOT_HOSTNAME
+
+    nslookup -type=AAAA "${_BOOT_HOSTNAME:?"Missing BOOT_HOSTNAME"}" | xargs -n 1 \
+        | grep -A2 -i "${_BOOT_HOSTNAME}" \
+        | grep -A1 -i address \
+        | tail -n1
+}
+
+function verified() {
+    local _PUBLISHED_IP
+    _PUBLISHED_IP="$(published)"
+    readonly _PUBLISHED_IP
+
+    [ -z "${_PUBLISHED_IP}" ] \
+        && return 0
+
+    all | grep "${_PUBLISHED_IP}"
+}
+
+function usage() {
+    echo "Use one of the following options:"
+    echo "  --all       : prints all IPv6 addresses"
+    echo "  --routed    : prints the IPv6 address used to send traffic to the default gateway"
+    echo "  --public    : prints all IPv6 addresses direct accessable from the internet"
+    echo "  --published : prints the IPv6 address provided by DNS using this host's name"
+    echo "  --verified  : prints the IPv6 included in 'all' und respended by 'published'"
+}
+
+
+
+function main(){
+
+    case "${1}" in
+        --all)
+            all
+            return 0
+            ;;
+        --routed)
+            routed
+            return 0
+            ;;
+        --public)
+            public
+            return 0
+            ;;
+        --published)
+            published
+            return 0
+            ;;
+        --verified)
+            verified
+            return 0
+            ;;
+        *)
+            usage
+            return 1
+            ;;
+    esac
+
+    return 1
+
+}
+
+ main "$@" && exit 0 || exit 1