[gentoo-user] ip_change_notifier

Post by t***@sys-concept.com
I run this little script to notify me when the IP changes. However at
time to time the file: "old_ip.txt" is being populated with an empty
line "no IP address"
What could be causing it?
#!/bin/bash
# Replace "YOUR_EMAIL" with your actual email address
# File to store the old IP address
IP_FILE="/home/fd/business/scripts/old_ip.txt"
# Read the old IP address from the file
OLD_IP=$(cat "$IP_FILE")
# Function to retrieve the IP address
get_ip_address() {
local ip_address
ip_address=$(curl -s https://ifconfig.me/ip)
echo "$ip_address"
}
# Query the API to get the current IP address
NEW_IP=$(curl -s https://api.ipify.org)

I found this site very slow to respond. It could be timing out with an
empty result. OTOH the URL used in the get_ip_address function is rapid,
but you don't call that function.

Post by t***@sys-concept.com
sleep 2
# Compare the new IP address with the old one
if [[ "$NEW_IP" != "$OLD_IP" ]]; then
echo "Your IP address has changed to $NEW_IP"
# Send an email notification
echo "New IP address: $NEW_IP" | mailto -s "IP address change" $EMAIL
# Allow overwriting of the file
set +o noclobber
# Update the old IP address in the file
# printf "%s" "$NEW_IP" > "$IP_FILE"
echo -n "$NEW_IP" > "$IP_FILE"
# Restore the noclobber option
set -o noclobber

You don't need to play with the noclobber option, just use >| for
redirection, which will always overwrite the file.

Post by t***@sys-concept.com
else
echo "Your IP address is still $OLD_IP"
fi

--
Neil Bothwick

Linux like wigwam. No windows, no gates, Apache inside.

t***@sys-concept.com

2023-06-27 17:50:01 UTC

I found this site very slow to respond. It could be timing out with an
empty result. OTOH the URL used in the get_ip_address function is rapid,
but you don't call that function.

Yes, I notice it, it take upwards 10sec to get an IP and sometimes I get a timeout, I increases "sleep 15" hopefully it will help.

Post by t***@sys-concept.com
# Compare the new IP address with the old one
if [[ "$NEW_IP" != "$OLD_IP" ]]; then
echo "Your IP address has changed to $NEW_IP"
# Send an email notification
echo "New IP address: $NEW_IP" | mailto -s "IP address change" $EMAIL
# Allow overwriting of the file
set +o noclobber
# Update the old IP address in the file
# printf "%s" "$NEW_IP" > "$IP_FILE"
echo -n "$NEW_IP" > "$IP_FILE"
# Restore the noclobber option
set -o noclobber

You don't need to play with the noclobber option, just use >| for
redirection, which will always overwrite the file.

Thanks for the pointer.

Post by t***@sys-concept.com
else
echo "Your IP address is still $OLD_IP"
fi

Neil Bothwick

2023-06-27 19:30:01 UTC

Post by t***@sys-concept.com
I run this little script to notify me when the IP changes. However
at time to time the file: "old_ip.txt" is being populated with an
empty line "no IP address"
What could be causing it?
#!/bin/bash
# Replace "YOUR_EMAIL" with your actual email address
# File to store the old IP address
IP_FILE="/home/fd/business/scripts/old_ip.txt"
# Read the old IP address from the file
OLD_IP=$(cat "$IP_FILE")
# Function to retrieve the IP address
get_ip_address() {
local ip_address
ip_address=$(curl -s https://ifconfig.me/ip)
echo "$ip_address"
}
# Query the API to get the current IP address
NEW_IP=$(curl -s https://api.ipify.org)

I found this site very slow to respond. It could be timing out with an
empty result. OTOH the URL used in the get_ip_address function is
rapid, but you don't call that function.

Yes, I notice it, it take upwards 10sec to get an IP and sometimes I
get a timeout, I increases "sleep 15" hopefully it will help.

It won't because the curl command is running synchronously. All
increasing the sleep does is make you wait longer after it fails. Why not
simply switch to the other service that seems to work more reliably?

--
Neil Bothwick

If someone with multiple personalities threatens to kill himself, is it
considered a hostage situation?

t***@sys-concept.com

2023-06-28 00:40:02 UTC

Post by t***@sys-concept.com
I run this little script to notify me when the IP changes. However
at time to time the file: "old_ip.txt" is being populated with an
empty line "no IP address"
What could be causing it?
#!/bin/bash
# Replace "YOUR_EMAIL" with your actual email address
# File to store the old IP address
IP_FILE="/home/fd/business/scripts/old_ip.txt"
# Read the old IP address from the file
OLD_IP=$(cat "$IP_FILE")
# Function to retrieve the IP address
get_ip_address() {
local ip_address
ip_address=$(curl -s https://ifconfig.me/ip)
echo "$ip_address"
}
# Query the API to get the current IP address
NEW_IP=$(curl -s https://api.ipify.org)

I found this site very slow to respond. It could be timing out with an
empty result. OTOH the URL used in the get_ip_address function is
rapid, but you don't call that function.

Yes, I notice it, it take upwards 10sec to get an IP and sometimes I
get a timeout, I increases "sleep 15" hopefully it will help.

Hmm,... do you mean i run:
NEW_IP=$(curl -s https://ifconfig.me/ip)

I tried it. When the "curl -s https://ifconfig.me/ip" failed, showing empty IP
curl -s https://ifconfig.me/ip was empty as well.

t***@sys-concept.com

2023-06-28 01:00:01 UTC

Thelma

Post by t***@sys-concept.com
I run this little script to notify me when the IP changes. However
at time to time the file: "old_ip.txt" is being populated with an
empty line "no IP address"
What could be causing it?
#!/bin/bash
# Replace "YOUR_EMAIL" with your actual email address
# File to store the old IP address
IP_FILE="/home/fd/business/scripts/old_ip.txt"
# Read the old IP address from the file
OLD_IP=$(cat "$IP_FILE")
# Function to retrieve the IP address
get_ip_address() {
local ip_address
ip_address=$(curl -s https://ifconfig.me/ip)
echo "$ip_address"
}
# Query the API to get the current IP address
NEW_IP=$(curl -s https://api.ipify.org)

I found this site very slow to respond. It could be timing out with an
empty result. OTOH the URL used in the get_ip_address function is
rapid, but you don't call that function.

Yes, I notice it, it take upwards 10sec to get an IP and sometimes I
get a timeout, I increases "sleep 15" hopefully it will help.

I think this is better version:
#!/bin/bash

# Replace "YOUR_EMAIL" with your actual email address
EMAIL="***@gmail.com"

# File to store the old IP address
IP_FILE="/home/fd/business/scripts/old_ip.txt"

# Read the old IP address from the file
OLD_IP=$(cat "$IP_FILE")

# Function to retrieve the IP address
get_ip_address() {
local ip_address
ip_address=$(wget -qO- ipinfo.io/ip)
echo "$ip_address"
}

# Query the API to get the current IP address
NEW_IP=$(get_ip_address)

# Retry if the IP address is empty
retry_count=0
while [[ -z "$NEW_IP" && $retry_count -lt 3 ]]; do
sleep 1
NEW_IP=$(get_ip_address)
((retry_count++))
done

# Compare the new IP address with the old one
if [[ "$NEW_IP" != "$OLD_IP" ]]; then
echo "Your IP address has changed to $NEW_IP"

# Send an email notification
echo "New IP address: $NEW_IP" | mailto -s "IP address change" $EMAIL

# Update the old IP address in the file
echo -n "$NEW_IP" >| "$IP_FILE"
else
echo "Your IP address is still $OLD_IP"
fi

Neil Bothwick

2023-06-28 07:10:01 UTC

Post by t***@sys-concept.com
# Query the API to get the current IP address
NEW_IP=$(get_ip_address)
# Retry if the IP address is empty
retry_count=0
while [[ -z "$NEW_IP" && $retry_count -lt 3 ]]; do
sleep 1
NEW_IP=$(get_ip_address)
((retry_count++))
done

That's better, although I would use a longer sleep to allow for network
issues.

--
Neil Bothwick

Documentation: (n.) a novel sold with software, designed to entertain the
operator during episodes of bugs or glitches.

Paul Colquhoun

2023-06-28 07:30:01 UTC

That's better, although I would use a longer sleep to allow for network
issues.

# Retry if the IP address is empty
retry_count=0
while [[ -z "$NEW_IP" && $retry_count -lt 3 ]]; do

((retry_count++))
sleep $retry_count
NEW_IP=$(get_ip_address)

done

--
Reverend Paul Colquhoun, ULC. http://andor.dropbear.id.au/
Asking for technical help in newsgroups? Read this first:
http://catb.org/~esr/faqs/smart-questions.html#intro

t***@sys-concept.com

2023-06-28 15:10:01 UTC

That's better, although I would use a longer sleep to allow for network
issues.

# Retry if the IP address is empty
retry_count=0
while [[ -z "$NEW_IP" && $retry_count -lt 3 ]]; do
((retry_count++))
sleep $retry_count
NEW_IP=$(get_ip_address)
done

Thank you, no more empty IP in txt file.

Matt Connell

2023-06-28 14:40:01 UTC