Help making a simple Linux program

[Jaybird]

I'm looking for a program or making a program that will email me when my public ip changes so if I am out of town I can still ssh into my server. I've tried some programs before but I have not been able to get any of those to work. I'd appreciate the help.

[CornOnJacob]

I'm looking for a program or making a program that will email me when my public ip changes so if I am out of town I can still ssh into my server. I've tried some programs before but I have not been able to get any of those to work. I'd appreciate the help.

Try a free no-ip.com account. It gives you a hostname and redirects it to whatever your IP is.

[Enderman]

With no-ip you can download a program to your computer that will tell no-ip your IP address. You get a free name address (like "yourpc.somedomain.com") and you will always be able to connect to yourpc.somedomain.com because it will always know the latest IP of your router, and will redirect you there.

[xXxYOLOxSWAGxXx_420BlazeIt]

I'm looking for a program or making a program that will email me when my public ip changes so if I am out of town I can still ssh into my server. I've tried some programs before but I have not been able to get any of those to work. I'd appreciate the help.

Put this command in a cron job

mail -s "IP Adress $(curl -s checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//')" YOUR@EMAIL.HERE

I didnt test if it works, but it should.

[Jaybird]

Try a free no-ip.com account. It gives you a hostname and redirects it to whatever your IP is.

Not exactly what I am looking for. I really only need something that checks the current public ip, verify that has/has not changed and if it has changed, it will send me an email with the updated ip.

[IdeaStormer]

A bash or perl script can do that, have it run in cron repeatedly to check for the IP change and then mail you info or a note.

[Jaybird]

Put this command in a cron job

mail -s "IP Adress )" YOUR@EMAIL.HERE

I didnt test if it works, but it should.

Assuming that works, I'm sitting in my engineering class at the moment, I can run a crontab: said script every 10 minutes. Said script will: look something like this:

Curl $(curl -s checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//')

If "oldip" = "new ip"

Then do nothing

If "oldip" /= "new ip"

Then mail -s "IP Adress $(curl -s checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//' )" YOUR@EMAIL.HERE

(Update oldip with newip content)

(Delete newip file)

[IdeaStormer]

Instead of using curl shouldn't you probe your nic directly? No need to rely on a second service unless you're testing that as well?

 

Get IP with: ifconfig eth0 | grep "inet addr" | awk '{print $2}' | grep -oP '(?<=addr:).*'

 

Assuming you are on eth0 and not some other interface.

[fizzlesticks]

Instead of using curl shouldn't you probe your nic directly? No need to rely on a second service unless you're testing that as well?

 

Get IP with: ifconfig eth0 | grep "inet addr" | awk '{print $2}' | grep -oP '(?<=addr:).*'

 

Assuming you are on eth0 and not some other interface.

Don't know if it's because I'm running Linux in a VM but that doesn't return my public IP.

 

@Jaybird If you have a gmail account you can use this Python3 script I just happen to have laying around.

import json, urllib.request, time, smtplibusername = "XXX@gmail.com"password = "xxxx"def getIP():	try:		ip = json.loads(urllib.request.urlopen('http://httpbin.org/ip').read().decode())['origin']		return ip	except:		return Nonedef sendEmail(ip):	try:		msg = 'From: {}\r\nTo: {}\r\n\r\nNew IP: {}\r\n'.format(username,username,ip)		server = smtplib.SMTP('smtp.gmail.com:587')		server.starttls()		server.login(username,password)		server.sendmail(username, username, msg)		server.quit()		return True	except:		return Falsedef main():	ip = getIP()	while True:		newIP = getIP()		if not newIP:			time.sleep(30)			continue		if ip != newIP:			while not sendEmail(newIP): 				pass			print("Got new IP: {}".format(newIP))		ip = newIP		time.sleep(600)if __name__ == '__main__':	main()

[Jaybird]

 

Don't know if it's because I'm running Linux in a VM but that doesn't return my public IP.

 

@Jaybird If you have a gmail account you can use this Python3 script I just happen to have laying around.

import json, urllib.request, time, smtplibusername = "XXX@gmail.com"password = "xxxx"def getIP():	try:		ip = json.loads(urllib.request.urlopen('http://httpbin.org/ip').read().decode())['origin']		return ip	except:		return Nonedef sendEmail(ip):	try:		msg = 'From: {}\r\nTo: {}\r\n\r\nNew IP: {}\r\n'.format(username,username,ip)		server = smtplib.SMTP('smtp.gmail.com:587')		server.starttls()		server.login(username,password)		server.sendmail(username, username, msg)		server.quit()		return True	except:		return Falsedef main():	ip = getIP()	while True:		newIP = getIP()		if not newIP:			time.sleep(30)			continue		if ip != newIP:			while not sendEmail(newIP): 				pass			print("Got new IP: {}".format(newIP))		ip = newIP		time.sleep(600)if __name__ == '__main__':	main()

ah yus! see i knew there was a simple program out there. yes I do have a personal gmail account for my server.

 

I am stil slowly learning linux and very slowly understanding programs. I know you can use crontab to run a program at set intervals but for this python program, I dont need a crontab setting to activate it? 

[fizzlesticks]

 I dont need a crontab setting to activate it? 

Nope, just start it and it will keep running.

[Jaybird]

Nope, just start it and it will keep running.

should be last question. 

I assume this scrip will send an email from my server email address to my server email address. but what if I want it sent to my personal email address. 

 

would i change 

 

server.sendmail(username, username, msg)

to

server.sendmail(other@gmail.com, username, msg)

[fizzlesticks]

should be last question. 

I assume this scrip will send an email from my server email address to my server email address. but what if I want it sent to my personal email address. 

 

would i change 

 

server.sendmail(username, username, msg)

to

server.sendmail(other@gmail.com, username, msg)

Changing that line and

msg = 'From: {}\r\nTo: {}\r\n\r\nNew IP: {}\r\n'.format(username,'other@gmail.com',ip)

should do it.

 

edit:

server.sendmail(other@gmail.com, username, msg)

should be

server.sendmail(username, other@gmail.com, msg)

[Jaybird]

Changing that line and

msg = 'From: {}\r\nTo: {}\r\n\r\nNew IP: {}\r\n'.format(username,'other@gmail.com',ip)

should do it.

 

edit:

server.sendmail(other@gmail.com, username, msg)

should be

server.sendmail(username, other@gmail.com, msg)

 

 

looking at the code again today, viewing from my ipad, so i decided to run it and it came back with a invalid syntax. This was the line with the error and what the error was. what do you think?

 

msg = 'From: {}\r\nTo: {}\r\n\r\nNew IP: {}\r\n'.format(username,personal@gmail.com,ip)

[fizzlesticks]

 

looking at the code again today, viewing from my ipad, so i decided to run it and it came back with a invalid syntax. This was the line with the error and what the error was. what do you think?

 

msg = 'From: {}\r\nTo: {}\r\n\r\nNew IP: {}\r\n'.format(username,personal@gmail.com,ip)

 

You need quotes around 'personal@gmail.com'

[Jaybird]

You need quotes around 'personal@gmail.com'

 

I knew that. ok next error. 

Traceback (most recent call last):  File "ipnote.py", line 1, in <module>    import json, urllib.request, time, smtplibImportError: No module named request

[fizzlesticks]

 

I knew that. ok next error. 

Have to use python3