Example explanation of automatically obtaining public IP in Python

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0. Preliminary knowledge

0.1 SQL Basic

ubuntu, Debian series installation:

root@raspberrypi:~/python-script# apt-get install mysql-server

Redhat, Centos series installation:

 [root@localhost ~]# yum install mysql-server

Log in to the database

pi@raspberrypi:~ $ mysql -uroot -p -hlocalhost
Enter password: 
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 36
Server version: 10.0.30-MariaDB-0+deb8u2 (Raspbian)

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

Among them, mysql is the client command -u is the specified user- p is the password - h is the host

Create database, create data table

The syntax for creating a database is as follows

MariaDB [(none)]> help create database
Name: 'CREATE DATABASE'
Description:
Syntax:
CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name
 [create_specification] ...

create_specification:
 [DEFAULT] CHARACTER SET [=] charset_name
 | [DEFAULT] COLLATE [=] collation_name

CREATE DATABASE creates a database with the given name. To use this
statement, you need the CREATE privilege for the database. CREATE
SCHEMA is a synonym for CREATE DATABASE.

URL: https://mariadb.com/kb/en/create-database/


MariaDB [(none)]>

The syntax for creating a data table is as follows

MariaDB [(none)]> help create table
Name: 'CREATE TABLE'
Description:
Syntax:
CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
 (create_definition,...)
 [table_options]
 [partition_options]

Or:

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
 [(create_definition,...)]
 [table_options]
 [partition_options]
 select_statement

Create database ServiceLogs

MariaDB [(none)]> CREATE DATABASE `ServiceLogs`

Create data table

MariaDB [(none)]> CREATE TABLE `python_ip_logs` (
 `serial_number` bigint(20) NOT NULL AUTO_INCREMENT,
 `time` datetime DEFAULT NULL,
 `old_data` varchar(50) DEFAULT NULL,
 `new_data` varchar(50) DEFAULT NULL,
 PRIMARY KEY (`serial_number`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1

Query of table contents

 MariaDB [ServiceLogs]> select * from python_ip_logs;
 Empty set (0.00 sec)

0.2 python connection operation MySQL

module download and installation

Download path: https://pypi.python.org/pypi/MySQL-python

Installation:

安装:
解压
unzip MySQL-python-1.2.5.zip
进入解压后目录
cd MySQL-python-1.2.5/
安装依赖
apt-get install libmysqlclient-dev
安装
python setup.py install
如果为0则安装OK
echo $?

Connect to Mysql

root@raspberrypi:~/python-script# cat p_mysql_3.py 
#!/usr/bin/env python

import MySQLdb

try :
  conn = MySQLdb.connect("主机","用户名","密码","ServiceLogs")
  print ("Connect Mysql successful")
except:
  print ("Connect MySQL Fail")
root@raspberrypi:~/python-script#

If Connect Mysql successful is output, the connection is OK

Python MySQL insert statement

root@raspberrypi:~/python-script# cat p_mysql1.py 
#!/usr/bin/env python

import MySQLdb

db = MySQLdb.connect("localhost","root","root","ServiceLogs")

cursor = db.cursor()

sql = "insert INTO python_ip_logs VALUES (DEFAULT,'2017-09-29 22:46:00','123','456')"

cursor.execute(sql)
db.commit()

db.close()
root@raspberrypi:~/python-script#

After the execution is completed, you can view the results with the mysql client SELECT statement

1. Requirements

##1.1 Requirements

Since the broadband will obtain a new IP every time it is restarted, in this state, there will be a lot of inconvenience when making an SSH connection. Fortunately, there was peanut shell software before, It can find your IP address through the domain name and access it. This is the best. However, recently, Peanut Shell also requires real-name authentication before it can be used. So, this prompted me to write a python script to obtain the public network. IP impulse.

Achievement effect: When the IP changes, it can be notified by email and the data can be written in the database

1.2 General idea

##1.3 Flowchart

The other codes are nothing to draw

2.

Code writing

2.1.1 Write python codegetnetworkip.py

root@raspberrypi:~/python-script# cat getnetworkip.py 
#!/usr/bin/env python
# coding:UTF-8

import requests
import send_mail
import savedb

def get_out_ip() :
  url = r'http://www.trackip.net/'
  r = requests.get(url)
  txt = r.text
  ip = txt[txt.find('title')+6:txt.find('/title')-1]
  return (ip)

def main() :
  try:
    savedb.general_files()

    tip = get_out_ip()
    cip = savedb.read_files()


    if savedb.write_files(cip,tip) :
      send_mail.SamMail(get_out_ip())
  except :
    return False

if __name__=="__main__" :
  main()
root@raspberrypi:~/python-script#

savedb .py

root@raspberrypi:~/python-script# cat savedb.py
#!/usr/bin/env python

import MySQLdb
import os
import time

dirname = "logs"
filename = "logs/.ip_tmp"

def general_files(Default_String="Null") :

  var1 = Default_String

  if not os.path.exists(dirname) :
    os.makedirs(dirname)

  if not os.path.exists(filename) :
    f = open(filename,'w')
    f.write(var1)
    f.close()

def read_files() :
  f = open(filename,'r')
  txt = f.readline()
  return (txt)

def write_files(txt,new_ip) :
  if not txt == new_ip :
    NowTime = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
    old_ip = read_files()
    os.remove(filename)
    general_files(new_ip)
    write_db(NowTime,old_ip,new_ip)
    return True
  else:
    return False


def write_db(NowTime,Old_ip,New_ip) :
  db = MySQLdb.connect("主机","用户名","密码","库名")

  cursor = db.cursor()

  sql = """
    INSERT INTO python_ip_logs 
    VALUES
    (DEFAULT,"%s","%s","%s")
  """ %(NowTime,Old_ip,New_ip)

  try:
    cursor.execute(sql)
    db.commit()
  except:
    db.rollback()

  db.close()
root@raspberrypi:~/python-script#

send_mail.py

root@raspberrypi:~/python-script# cat send_mail.py
#!/usr/bin/env python

import smtplib
import email.mime.text

def SamMail(HtmlString) :
 HOST = "smtp.163.com"
 SUBJECT = "主题"
 TO = "对方的邮箱地址"
 FROM = "来自于哪里"
 Remask = "The IP address has been changed"

 msg = email.mime.text.MIMEText("""
  <html>
    <head>
      <meta charset="utf-8" />
    </head>
    <body>
      <em><h1 id="ip-s">ip:%s</h1></em>
    </body>
  </html>
  """ %(HtmlString),"html","utf-8")

 msg[&#39;Subject&#39;] = SUBJECT
 msg[&#39;From&#39;] = FROM
 msg[&#39;TO&#39;] = TO

 try:
  server = smtplib.SMTP()
  server.connect(HOST,&#39;25&#39;)
  server.starttls()
  server.login("用户名","密码")
  server.sendmail(FROM,TO,msg.as_string())
  server.quit()
 except:
  print ("Send mail Error")
root@raspberrypi:~/python-script# 
 print ("%s" %(line),end=&#39;&#39;)

3. EffectThe email received is as follows:

Use SELECT to view the table, the effect is as follows:

Put the script into crontab and let it execute scheduled tasks

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