Merge remote-tracking branch 'pedro/pedro'

README.md

@@ -10,3 +10,4 @@ into the ungleich clearning circle.
 * [Pedro](https://code.ungleich.ch/pedro/ungleich-learning-circle/-/tree/pedro): git@code.ungleich.ch:pedro/ungleich-learning-circle.git
 * [Sami](https://code.ungleich.ch/samialazar/learning-cicle): git@code.ungleich.ch:samialazar/learning-cicle.git
 * [Youngjin](https://code.ungleich.ch/youngjin.han/ungleich-learning-circle): git@code.ungleich.ch:youngjin.han/ungleich-learning-circle.git
+* [Pedro](https://code.ungleich.ch/pedro/ungleich-learning-circle): git@code.ungleich.ch:pedro/ungleich-learning-circle.git

pedro/.gitignore

@@ -0,0 +1,2 @@
+*pyc
+django-tutorial/mysite/db.sqlite3

pedro/django-tutorial/mysite/manage.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

pedro/django-tutorial/mysite/mysite/asgi.py

@@ -0,0 +1,16 @@
+"""
+ASGI config for mysite project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.0/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
+
+application = get_asgi_application()

pedro/django-tutorial/mysite/mysite/settings.py

@@ -0,0 +1,126 @@
+"""
+Django settings for mysite project.
+
+Generated by 'django-admin startproject' using Django 3.0.8.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.0/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/3.0/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = '37jgpv28n1x!f3-48h)4ad99&jz-ek$@e6uf*an5uve6%7atqq'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = [
+
+"localhost",
+"2a0a-e5c1-011f-0000-0000-0000-0000-0001.has-a.name"
+
+]
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'polls.apps.PollsConfig',
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'mysite.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [os.path.join(BASE_DIR, 'templates')],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'mysite.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/3.0/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/3.0/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'Europe/Madrid'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/3.0/howto/static-files/
+
+STATIC_URL = '/static/'

pedro/django-tutorial/mysite/mysite/urls.py

@@ -0,0 +1,22 @@
+"""mysite URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/3.0/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import include, path
+
+urlpatterns = [
+    path('polls/', include('polls.urls')),
+    path('admin/', admin.site.urls),
+]

pedro/django-tutorial/mysite/mysite/wsgi.py

@@ -0,0 +1,16 @@
+"""
+WSGI config for mysite project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.0/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
+
+application = get_wsgi_application()

pedro/django-tutorial/mysite/polls/admin.py

@@ -0,0 +1,26 @@
+from django.contrib import admin
+
+# Register your models here.
+
+from .models import Choice, Question
+
+# stacked: that's lot of space
+#class ChoiceInline(admin.StackedInline):
+class ChoiceInline(admin.TabularInline):
+  model = Choice
+  extra = 3
+
+class QuestionAdmin(admin.ModelAdmin):
+  # # this way we changed the order
+  #fields = ['pub_date', 'question_text']
+  # # different organization of fields
+  fieldsets = [
+    (None,               {'fields': ['question_text']}),
+    ('Date information', {'fields': ['pub_date']}),
+  ]
+  inlines = [ChoiceInline]
+  list_display = ('question_text', 'pub_date', 'was_published_recently')
+  list_filter = ['pub_date']
+  search_fields = ['question_text']
+
+admin.site.register(Question, QuestionAdmin)

pedro/django-tutorial/mysite/polls/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class PollsConfig(AppConfig):
+    name = 'polls'

pedro/django-tutorial/mysite/polls/migrations/0001_initial.py

@@ -0,0 +1,32 @@
+# Generated by Django 3.0.8 on 2020-07-03 12:48
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Question',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('question_text', models.CharField(max_length=200)),
+                ('pub_date', models.DateTimeField(verbose_name='date published')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Choice',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('choice_text', models.CharField(max_length=200)),
+                ('votes', models.IntegerField(default=0)),
+                ('question', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='polls.Question')),
+            ],
+        ),
+    ]

pedro/django-tutorial/mysite/polls/models.py

@@ -0,0 +1,27 @@
+import datetime
+
+from django.db import models
+from django.utils import timezone
+
+# Create your models here.
+
+class Question(models.Model):
+  question_text = models.CharField(max_length=200)
+  pub_date = models.DateTimeField('date published')
+  def __str__(self):
+    return self.question_text
+  def was_published_recently(self):
+    # bug
+    #return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
+    now = timezone.now()
+    return now - datetime.timedelta(days=1) <= self.pub_date <= now
+  was_published_recently.admin_order_field = 'pub_date'
+  was_published_recently.boolean = True
+  was_published_recently.short_description = 'Published recently?'
+
+class Choice(models.Model):
+  question = models.ForeignKey(Question, on_delete=models.CASCADE)
+  choice_text = models.CharField(max_length=200)
+  votes = models.IntegerField(default=0)
+  def __str__(self):
+    return self.choice_text

pedro/django-tutorial/mysite/polls/static/polls/style.css

@@ -0,0 +1,10 @@
+li a {
+    color: green;
+}
+
+body {
+  /* thanks: https://stackoverflow.com/questions/12605908/change-background-image-opacity/40366996#40366996 */
+  background-image: url("images/background.gif");
+  background-color: rgba(255,255,255,0.6);
+  background-blend-mode: lighten;
+}

pedro/django-tutorial/mysite/polls/templates/polls/detail.html

@@ -0,0 +1,12 @@
+<h1>{{ question.question_text }}</h1>
+
+{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
+
+<form action="{% url 'polls:vote' question.id %}" method="post">
+{% csrf_token %}
+{% for choice in question.choice_set.all %}
+    <input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}">
+    <label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br>
+{% endfor %}
+<input type="submit" value="Vote">
+</form>

pedro/django-tutorial/mysite/polls/templates/polls/index.html

@@ -0,0 +1,15 @@
+{% load static %}
+<link rel="stylesheet" type="text/css" href="{% static 'polls/style.css' %}">
+{% if latest_question_list %}
+  <ul>
+  {% for question in latest_question_list %}
+  {#  <li><a href="/polls/{{ question.id }}/">{{ question.question_text }}</a></li> #}
+  {#  refactor the hardcoded URL #}
+  {#  <li><a href="{% url 'detail' question.id %}">{{ question.question_text }}</a></li> #}
+  {#  use URL namespace #}
+    <li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>
+  {% endfor %}
+  </ul>
+{% else %}
+  <p>No polls are available.</p>
+{% endif %}

pedro/django-tutorial/mysite/polls/templates/polls/results.html

@@ -0,0 +1,9 @@
+<h1>{{ question.question_text }}</h1>
+
+<ul>
+{% for choice in question.choice_set.all %}
+  <li>{{ choice.choice_text }} -- {{ choice.votes }} vote{{ choice.votes|pluralize }}</li>
+{% endfor %}
+</ul>
+
+<a href="{% url 'polls:detail' question.id %}">Vote again?</a>

pedro/django-tutorial/mysite/polls/tests.py

@@ -0,0 +1,128 @@
+import datetime
+
+from django.test import TestCase
+
+from django.utils import timezone
+
+from .models import Question
+
+from django.urls import reverse
+
+
+class QuestionModelTests(TestCase):
+
+  def test_was_published_recently_with_future_question(self):
+    """
+    was_published_recently() returns False for questions whose pub_date
+    is in the future.
+    """
+    time = timezone.now() + datetime.timedelta(days=30)
+    future_question = Question(pub_date=time)
+    self.assertIs(future_question.was_published_recently(), False)
+
+  def test_was_published_recently_with_old_question(self):
+    """
+    was_published_recently() returns False for questions whose pub_date
+    is older than 1 day.
+    """
+    time = timezone.now() - datetime.timedelta(days=1, seconds=1)
+    old_question = Question(pub_date=time)
+    self.assertIs(old_question.was_published_recently(), False)
+
+  def test_was_published_recently_with_recent_question(self):
+    """
+    was_published_recently() returns True for questions whose pub_date
+    is within the last day.
+    """
+    time = timezone.now() - datetime.timedelta(hours=23, minutes=59, seconds=59)
+    recent_question = Question(pub_date=time)
+    self.assertIs(recent_question.was_published_recently(), True)
+
+
+
+def create_question(question_text, days):
+  """
+  Create a question with the given `question_text` and published the
+  given number of `days` offset to now (negative for questions published
+  in the past, positive for questions that have yet to be published).
+  """
+  time = timezone.now() + datetime.timedelta(days=days)
+  return Question.objects.create(question_text=question_text, pub_date=time)
+
+class QuestionIndexViewTests(TestCase):
+  def test_no_questions(self):
+    """
+    If no questions exist, an appropriate message is displayed.
+    """
+    response = self.client.get(reverse('polls:index'))
+    self.assertEqual(response.status_code, 200)
+    self.assertContains(response, "No polls are available.")
+    self.assertQuerysetEqual(response.context['latest_question_list'], [])
+
+  def test_past_question(self):
+    """
+    Questions with a pub_date in the past are displayed on the
+    index page.
+    """
+    create_question(question_text="Past question.", days=-30)
+    response = self.client.get(reverse('polls:index'))
+    self.assertQuerysetEqual(
+      response.context['latest_question_list'],
+      ['<Question: Past question.>']
+    )
+
+  def test_future_question(self):
+    """
+    Questions with a pub_date in the future aren't displayed on
+    the index page.
+    """
+    create_question(question_text="Future question.", days=30)
+    response = self.client.get(reverse('polls:index'))
+    self.assertContains(response, "No polls are available.")
+    self.assertQuerysetEqual(response.context['latest_question_list'], [])
+
+  def test_future_question_and_past_question(self):
+    """
+    Even if both past and future questions exist, only past questions
+    are displayed.
+    """
+    create_question(question_text="Past question.", days=-30)
+    create_question(question_text="Future question.", days=30)
+    response = self.client.get(reverse('polls:index'))
+    self.assertQuerysetEqual(
+      response.context['latest_question_list'],
+      ['<Question: Past question.>']
+    )
+
+  def test_two_past_questions(self):
+    """
+    The questions index page may display multiple questions.
+    """
+    create_question(question_text="Past question 1.", days=-30)
+    create_question(question_text="Past question 2.", days=-5)
+    response = self.client.get(reverse('polls:index'))
+    self.assertQuerysetEqual(
+      response.context['latest_question_list'],
+      ['<Question: Past question 2.>', '<Question: Past question 1.>']
+    )
+
+class QuestionDetailViewTests(TestCase):
+  def test_future_question(self):
+    """
+    The detail view of a question with a pub_date in the future
+    returns a 404 not found.
+    """
+    future_question = create_question(question_text='Future question.', days=5)
+    url = reverse('polls:detail', args=(future_question.id,))
+    response = self.client.get(url)
+    self.assertEqual(response.status_code, 404)
+
+  def test_past_question(self):
+    """
+    The detail view of a question with a pub_date in the past
+    displays the question's text.
+    """
+    past_question = create_question(question_text='Past Question.', days=-5)
+    url = reverse('polls:detail', args=(past_question.id,))
+    response = self.client.get(url)
+    self.assertContains(response, past_question.question_text)

pedro/django-tutorial/mysite/polls/urls.py

@@ -0,0 +1,17 @@
+from django.urls import path
+
+from . import views
+
+# namespacing URLs
+app_name = 'polls'
+urlpatterns = [
+  # ex: /polls/
+  #path('', views.index, name='index'),
+  path('', views.IndexView.as_view(), name='index'),
+  # ex: /polls/5/
+  path('<int:pk>/', views.DetailView.as_view(), name='detail'),
+  # ex: /polls/5/results/
+  path('<int:pk>/results/', views.ResultsView.as_view(), name='results'),
+  # ex: /polls/5/vote/
+  path('<int:question_id>/vote/', views.vote, name='vote'),
+]

pedro/django-tutorial/mysite/polls/views.py

@@ -0,0 +1,125 @@
+from django.shortcuts import get_object_or_404, render
+
+# Create your views here.
+
+from django.http import HttpResponse, HttpResponseRedirect
+from django.template import loader
+from django.urls import reverse
+from django.views import generic
+
+from .models import Choice, Question
+
+from django.http import Http404
+
+from django.utils import timezone
+
+## simple index
+#def index(request):
+#  return HttpResponse("Hello, world. You're at the polls index.")
+
+## meaningful index
+#def index(request):
+#  latest_question_list = Question.objects.order_by('-pub_date')[:5]
+#  output = ', '.join([q.question_text for q in latest_question_list])
+#  return HttpResponse(output)
+
+## meaningful and templated index
+#def index(request):
+#  latest_question_list = Question.objects.order_by('-pub_date')[:5]
+#  template = loader.get_template('polls/index.html')
+#  context = {
+#    'latest_question_list': latest_question_list,
+#  }
+#  return HttpResponse(template.render(context, request))
+
+## meaningful, templated and easy to write index
+## and then we no longer need to import loader and HttpResponse
+#def index(request):
+#  latest_question_list = Question.objects.order_by('-pub_date')[:5]
+#  context = {
+#    'latest_question_list': latest_question_list,
+#  }
+#  return render(request, 'polls/index.html', context)
+
+class IndexView(generic.ListView):
+  template_name = 'polls/index.html'
+  context_object_name = 'latest_question_list'
+
+## has bug
+#  def get_queryset(self):
+#    """Return the last five published questions."""
+#    return Question.objects.order_by('-pub_date')[:5]
+
+# refactor
+  def get_queryset(self):
+    """
+    Return the last five published questions (not including those set to be
+    published in the future).
+    """
+    return Question.objects.filter(
+      pub_date__lte=timezone.now()
+    ).order_by('-pub_date')[:5]
+
+## simple detail
+#def detail(request, question_id):
+#  return HttpResponse("You're looking at question %s." % question_id)
+
+## meaningful detail
+#def detail(request, question_id):
+#  try:
+#    question = Question.objects.get(pk=question_id)
+#  except Question.DoesNotExist:
+#    raise Http404("Question does not exist")
+#  return render(request, 'polls/detail.html', {'question': question})
+
+## meaningful and easy to write detail
+#def detail(request, question_id):
+#  question = get_object_or_404(Question, pk=question_id)
+#  return render(request, 'polls/detail.html', {'question': question})
+
+## refactor detail view
+class DetailView(generic.DetailView):
+  model = Question
+  template_name = 'polls/detail.html'
+  def get_queryset(self):
+    """
+    Excludes any questions that aren't published yet.
+    """
+    return Question.objects.filter(pub_date__lte=timezone.now())
+
+#def results(request, question_id):
+#  response = "You're looking at the results of question %s."
+#  return HttpResponse(response % question_id)
+
+# # real implementation of results
+#def results(request, question_id):
+#  question = get_object_or_404(Question, pk=question_id)
+#  return render(request, 'polls/results.html', {'question': question})
+
+# # refactor results view
+class ResultsView(generic.DetailView):
+  model = Question
+  template_name = 'polls/results.html'
+
+#def vote(request, question_id):
+#  return HttpResponse("You're voting on question %s." % question_id)
+
+
+# #real implementation of vote
+def vote (request, question_id):
+  question = get_object_or_404(Question, pk=question_id)
+  try:
+    selected_choice = question.choice_set.get(pk=request.POST['choice'])
+  except (KeyError, Choice.DoesNotExist):
+    # Redisplay the question voting form.
+    return render(request, 'polls/detail.html', {
+      'question': question,
+      'error_message': "You didn't select a choice.",
+    })
+  else:
+    selected_choice.votes += 1
+    selected_choice.save()
+    # Always return an HttpResponseRedirect after successfully dealing
+    # with POST data. This prevents data from being posted twice if a
+    # user hits the Back button
+    return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

pedro/django-tutorial/mysite/templates/admin/base_site.html

@@ -0,0 +1,9 @@
+{% extends "admin/base.html" %}
+
+{% block title %}{{ title }} | {{ site_title|default:_('Django site admin') }}{% endblock %}
+
+{% block branding %}
+<h1 id="site-name"><a href="{% url 'admin:index' %}">Polls
+{% endblock %}
+
+{% block nav-global %}{% endblock %}

pedro/ipv6-stuff/overlap.py

@@ -0,0 +1,53 @@
+import ipaddress
+import argparse
+# for exit codes
+import sys
+
+def proc_args():
+  # src https://docs.python.org/3/library/argparse.html#description
+  parser = argparse.ArgumentParser(description='Compare two IPs and check if they are overlapped or not')
+  parser.add_argument('ip1', type=str,
+                      help='IPv6 number 1')
+  parser.add_argument('ip2', type=str,
+                      help='IPv6 number 2')
+  args = parser.parse_args()
+  return args
+
+  #  - Write a python script that checks whether two IPv6 networks are overlapping
+  #    - *overlap.py ip1 ip2*
+
+def parse_ip(ip_arg):
+  if('/' in ip_arg):
+    ip_arg = ip_arg.split('/')[0]
+  else:
+    # if no network specified, assume a netmask of /48 for all of them
+    ip_arg = ip_arg + '/48'
+  # strict false to avoid -> https://stackoverflow.com/questions/40839147/ipaddress-module-valueerrors-has-host-bits-set-self
+  # strict is passed to IPv4Network or IPv6Network constructor. A ValueError is
+  #   raised if address does not represent a valid IPv4 or IPv6 address, or if
+  #   the network has host bits set. -> src https://docs.python.org/3/library/ipaddress.html#ipaddress.ip_network
+  return ipaddress.IPv6Network(ip_arg, False)
+
+def main():
+
+  is_overlap=False
+
+  args = proc_args()
+  try:
+    ip1 = parse_ip(args.ip1)
+    ip2 = parse_ip(args.ip2)
+  except:
+    print('incorrect IPv6 address')
+
+  # src https://docs.python.org/3/library/ipaddress.html#ipaddress.IPv4Network.overlaps
+  is_overlap = ip1.overlaps(ip2)
+
+  if(is_overlap):
+    print('overlap')
+    sys.exit(1)
+  else:
+    print('no overlap')
+    sys.exit(0)
+
+if __name__ == "__main__":
+    main()

pedro/ipv6-stuff/overlap_run.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+run_program() {
+  echo "args:\n  ip1: ${1}\n  ip2: ${2}"
+  printf 'output: '
+  python3 overlap.py ${1} ${2}
+  echo "exit code: $?"
+  echo '----------------'
+}
+
+#  - Use the following test IPv6 addresses:
+#    - 2001:db8::
+#    - 2001:db8:0:2::
+#    - 2001:db8:1::
+#  - Step 2: Make your script parse ipv6 networks (like
+#    2001:db8::/48 and 2001:db8::/64) ) and check whether they overlap
+
+ip1='2001:db8::'
+ip2='2001:db8:0:2::'
+run_program $ip1 $ip2
+
+ip1='2001:db8::'
+ip2='2001:db8:1::'
+run_program $ip1 $ip2
+
+ip1='2001:db8:0:2::'
+ip2='2001:db8:1::'
+run_program $ip1 $ip2
+
+ip1='2001:db8::/48'
+ip2='2001:db8::/64'
+run_program $ip1 $ip2