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• 

  24 days ago by vojha | Reply

  Scenario Overview

  This scenario involves establishing a 1-to-1 connection between mobile devices (192.168.10.x network) and televisions (192.168.20.x network) through a Linux server acting as an intermediary. The goal is to allow specific mobile devices to discover and connect only to certain TVs, creating a controlled connection process between networks.

  Problem and Objective

  Avahi Disabled Scenario

  When Avahi is disabled: - Mobile devices on the 192.168.10.x network cannot discover any TVs on the 192.168.20.x network.

  Avahi Enabled Scenario

  When Avahi is enabled: - All mobile devices can discover all TVs, allowing connections between any mobile and TV on the network.

  Proposed Solution and Process

  Create a C/C++ Program

  The program will interface with Avahi, handling the detection and communication between mobile and TV networks. It identifies the source (mobile) and target (TV) IP addresses and manages mDNS queries.

  Purpose of the C/C++ Program

  When Avahi is disabled, the program will handle and manipulate mDNS queries, allowing a 1-to-1 connection. The program ensures controlled forwarding of packets between networks, establishing specific connections between mobile devices and TVs.

  Steps to Implement

  1. Install and start the Avahi service.
  2. Create the C/C++ program to handle mDNS queries and unicast responses between the mobile and TV networks. The program will act as a proxy server, forwarding and restricting packets between the specified mobile and TV.

  Testing Procedure

  Validate the C program's functionality by sending mDNS queries from mobile devices and forwarding them to the TV network. Test and confirm that the forwarded responses are unicast and specific to the intended mobile device.

  Desired Outcomes & Future Works

  The desired outcome is to establish controlled 1-to-1 connections between specific mobile devices and TVs without Avahi automatically forwarding mDNS packets. This will ensure a restricted and secure network connection, allowing specific mobile devices to connect only to certain TVs.

  Note: Ensure that Avahi doesn't automatically forward packets unless the integration program is actively running.

  Result and Outcome

  I was able to run a simple service publication.

  Service Publication

  Publishes a service named "MyService" of type "example.tcp" on all network interfaces and protocols (IPv4 and IPv6) on port 12345. This service can be discovered on the local network.

  Output

  The output indicates the successful publication of the service. When the service is successfully published, the entry_group_callback function is called, and it prints: "Service 'MyService' successfully published."

  To run the C program, use the following example:

  gcc -o avahi_integration avahi_integration.c -lavahi-client -lavahi-common
  ./avahi_integration
  There are .sh files to install Avahi on Ubuntu, stop and start the daemon services as well, which makes life easier when testing different scenarios.
  
  Output
  En02 smart_tv found.
  
  bash
  Copy code
  $ ./avahi_integration
  Resolved service: Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa, _googlecast._tcp, local, a56831aa-ef2a-1db0-9c3f-d6b56ff217fa.local:8009
  Resolved service: Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa, _googlecast._tcp, local, a56831aa-ef2a-1db0-9c3f-d6b56ff217fa.local:8009
  ^C
  In another tab:
  
  bash
  Copy code
  avahi-browse -a
  Output:
  
  bash
  Copy code
  eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
  eno2 IPv4 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
  eno1 IPv4 dap2230 Web Site local
  eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
  eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
  eno2 IPv4 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
  Client failure, exiting: Daemon connection failed. The message appeared when we stopped the Avahi daemon using sudo systemctl stop avahi-daemon. Note that the ./avahi_integration ELF file was running in another tab, and nothing happened.
  

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Edit Comment 7658
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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## Scenario Overview This scenario involves establishing a 1-to-1 connection between mobile devices (192.168.10.x network) and televisions (192.168.20.x network) through a Linux server acting as an intermediary. The goal is to allow specific mobile devices to discover and connect only to certain TVs, creating a controlled connection process between networks. ## Problem and Objective ### Avahi Disabled Scenario When Avahi is disabled: - Mobile devices on the 192.168.10.x network cannot discover any TVs on the 192.168.20.x network. ### Avahi Enabled Scenario When Avahi is enabled: - All mobile devices can discover all TVs, allowing connections between any mobile and TV on the network. ## Proposed Solution and Process ### Create a C/C++ Program The program will interface with Avahi, handling the detection and communication between mobile and TV networks. It identifies the source (mobile) and target (TV) IP addresses and manages mDNS queries. ### Purpose of the C/C++ Program When Avahi is disabled, the program will handle and manipulate mDNS queries, allowing a 1-to-1 connection. The program ensures controlled forwarding of packets between networks, establishing specific connections between mobile devices and TVs. ## Steps to Implement 1. Install and start the Avahi service. 2. Create the C/C++ program to handle mDNS queries and unicast responses between the mobile and TV networks. The program will act as a proxy server, forwarding and restricting packets between the specified mobile and TV. ## Testing Procedure Validate the C program's functionality by sending mDNS queries from mobile devices and forwarding them to the TV network. Test and confirm that the forwarded responses are unicast and specific to the intended mobile device. ## Desired Outcomes & Future Works The desired outcome is to establish controlled 1-to-1 connections between specific mobile devices and TVs without Avahi automatically forwarding mDNS packets. This will ensure a restricted and secure network connection, allowing specific mobile devices to connect only to certain TVs. **Note:** Ensure that Avahi doesn't automatically forward packets unless the integration program is actively running. ## Result and Outcome I was able to run a simple service publication. ### Service Publication Publishes a service named "MyService" of type "_example._tcp" on all network interfaces and protocols (IPv4 and IPv6) on port 12345. This service can be discovered on the local network. ### Output The output indicates the successful publication of the service. When the service is successfully published, the `entry_group_callback` function is called, and it prints: "Service 'MyService' successfully published." To run the C program, use the following example: ```bash gcc -o avahi_integration avahi_integration.c -lavahi-client -lavahi-common ./avahi_integration There are .sh files to install Avahi on Ubuntu, stop and start the daemon services as well, which makes life easier when testing different scenarios. Output En02 smart_tv found. bash Copy code $ ./avahi_integration Resolved service: Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa, _googlecast._tcp, local, a56831aa-ef2a-1db0-9c3f-d6b56ff217fa.local:8009 Resolved service: Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa, _googlecast._tcp, local, a56831aa-ef2a-1db0-9c3f-d6b56ff217fa.local:8009 ^C In another tab: bash Copy code avahi-browse -a Output: bash Copy code eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local eno2 IPv4 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local eno1 IPv4 dap2230 Web Site local eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local eno2 IPv4 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local Client failure, exiting: Daemon connection failed. The message appeared when we stopped the Avahi daemon using sudo systemctl stop avahi-daemon. Note that the ./avahi_integration ELF file was running in another tab, and nothing happened.
 
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Reply to vojha
Scenario Overview
This scenario involves establishing a 1-to-1 connection between mobile devices (192.168.10.x network) and televisions (192.168.20.x network) through a Linux server acting as an intermediary. The goal is to allow specific mobile devices to discover and connect only to certain TVs, creating a controlled connection process between networks.
Problem and Objective
Avahi Disabled Scenario
When Avahi is disabled: - Mobile devices on the 192.168.10.x network cannot discover any TVs on the 192.168.20.x network.
Avahi Enabled Scenario
When Avahi is enabled: - All mobile devices can discover all TVs, allowing connections between any mobile and TV on the network.
Proposed Solution and Process
Create a C/C++ Program
The program will interface with Avahi, handling the detection and communication between mobile and TV networks. It identifies the source (mobile) and target (TV) IP addresses and manages mDNS queries.
Purpose of the C/C++ Program
When Avahi is disabled, the program will handle and manipulate mDNS queries, allowing a 1-to-1 connection. The program ensures controlled forwarding of packets between networks, establishing specific connections between mobile devices and TVs.
Steps to Implement
1. Install and start the Avahi service.
2. Create the C/C++ program to handle mDNS queries and unicast responses between the mobile and TV networks. The program will act as a proxy server, forwarding and restricting packets between the specified mobile and TV.
Testing Procedure
Validate the C program's functionality by sending mDNS queries from mobile devices and forwarding them to the TV network. Test and confirm that the forwarded responses are unicast and specific to the intended mobile device.
Desired Outcomes & Future Works
The desired outcome is to establish controlled 1-to-1 connections between specific mobile devices and TVs without Avahi automatically forwarding mDNS packets. This will ensure a restricted and secure network connection, allowing specific mobile devices to connect only to certain TVs.
Note: Ensure that Avahi doesn't automatically forward packets unless the integration program is actively running.
Result and Outcome
I was able to run a simple service publication.
Service Publication
Publishes a service named "MyService" of type "example.tcp" on all network interfaces and protocols (IPv4 and IPv6) on port 12345. This service can be discovered on the local network.
Output
The output indicates the successful publication of the service. When the service is successfully published, the entry_group_callback function is called, and it prints: "Service 'MyService' successfully published."
To run the C program, use the following example:
gcc -o avahi_integration avahi_integration.c -lavahi-client -lavahi-common
./avahi_integration
There are .sh files to install Avahi on Ubuntu, stop and start the daemon services as well, which makes life easier when testing different scenarios.

Output
En02 smart_tv found.

bash
Copy code
$ ./avahi_integration
Resolved service: Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa, _googlecast._tcp, local, a56831aa-ef2a-1db0-9c3f-d6b56ff217fa.local:8009
Resolved service: Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa, _googlecast._tcp, local, a56831aa-ef2a-1db0-9c3f-d6b56ff217fa.local:8009
^C
In another tab:

bash
Copy code
avahi-browse -a
Output:

bash
Copy code
eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
eno2 IPv4 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
eno1 IPv4 dap2230 Web Site local
eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
eno2 IPv6 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
eno2 IPv4 Smart-2K-ATV4-a56831aaef2a1db09c3fd6b56ff217fa _googlecast._tcp local
Client failure, exiting: Daemon connection failed. The message appeared when we stopped the Avahi daemon using sudo systemctl stop avahi-daemon. Note that the ./avahi_integration ELF file was running in another tab, and nothing happened.
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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• 

  24 days ago by vojha | Reply

  Avahi Integration and Network Connection README

  What is Avahi?

  Avahi is a system that facilitates service discovery on a local network. It implements Zeroconf networking specifications, including mDNS (multicast Domain Name System) and DNS-SD (DNS-based Service Discovery). Avahi enables devices to automatically discover and utilize services on the local network without requiring manual configuration.

  For more information, visit the Avahi website.

  Run in SUSE Linux OpenSUSE Tumbleweed

  The Avahi files were successfully installed on the system, and the following steps were performed:

  cd /usr/include/avahi-
  avahi-client/ avahi-common/ avahi-compat-libdns_sd/ avahi-core/ avahi-libevent/
  To compile and run the example program:
  
  bash
  Copy code
  gcc -o avahi_example avahi_example.c -lavahi-client -lavahi-common
  ./avahi_example
  To browse services:
  
  bash
  Copy code
  avahi-browse -a
  

×
Edit Comment 7661
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
More Complex Markdown Help
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• Edit
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# Avahi Integration and Network Connection README ## What is Avahi? Avahi is a system that facilitates service discovery on a local network. It implements Zeroconf networking specifications, including mDNS (multicast Domain Name System) and DNS-SD (DNS-based Service Discovery). Avahi enables devices to automatically discover and utilize services on the local network without requiring manual configuration. For more information, visit the [Avahi website](https://avahi.org/). ## Run in SUSE Linux OpenSUSE Tumbleweed The Avahi files were successfully installed on the system, and the following steps were performed: ```bash cd /usr/include/avahi- avahi-client/ avahi-common/ avahi-compat-libdns_sd/ avahi-core/ avahi-libevent/ To compile and run the example program: bash Copy code gcc -o avahi_example avahi_example.c -lavahi-client -lavahi-common ./avahi_example To browse services: bash Copy code avahi-browse -a
 
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Reply to vojha
Avahi Integration and Network Connection README
What is Avahi?
Avahi is a system that facilitates service discovery on a local network. It implements Zeroconf networking specifications, including mDNS (multicast Domain Name System) and DNS-SD (DNS-based Service Discovery). Avahi enables devices to automatically discover and utilize services on the local network without requiring manual configuration.
For more information, visit the Avahi website.
Run in SUSE Linux OpenSUSE Tumbleweed
The Avahi files were successfully installed on the system, and the following steps were performed:
cd /usr/include/avahi-
avahi-client/ avahi-common/ avahi-compat-libdns_sd/ avahi-core/ avahi-libevent/
To compile and run the example program:

bash
Copy code
gcc -o avahi_example avahi_example.c -lavahi-client -lavahi-common
./avahi_example
To browse services:

bash
Copy code
avahi-browse -a
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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• 

  24 days ago by vojha | Reply

  All the programs and shell scripts

  Everything is posted in github, feel free to check the codes and implement the same at your end. See you in next Hackweek

  https://github.com/varunkojha/avahi-c

  Desired Outcomes & Future Works

  The desired outcome is to establish controlled 1-to-1 connections between specific mobile devices and TVs without Avahi automatically forwarding mDNS packets. This will ensure a restricted and secure network connection, allowing specific mobile devices to connect only to certain TVs.

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Edit Comment 7664
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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## All the programs and shell scripts #### Everything is posted in github, feel free to check the codes and implement the same at your end. See you in next Hackweek https://github.com/varunkojha/avahi-c ### Desired Outcomes & Future Works ##### The desired outcome is to establish controlled 1-to-1 connections between specific mobile devices and TVs without Avahi automatically forwarding mDNS packets. This will ensure a restricted and secure network connection, allowing specific mobile devices to connect only to certain TVs.
 
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Reply to vojha
All the programs and shell scripts
Everything is posted in github, feel free to check the codes and implement the same at your end. See you in next Hackweek
https://github.com/varunkojha/avahi-c
Desired Outcomes & Future Works
The desired outcome is to establish controlled 1-to-1 connections between specific mobile devices and TVs without Avahi automatically forwarding mDNS packets. This will ensure a restricted and secure network connection, allowing specific mobile devices to connect only to certain TVs.
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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• 

  24 days ago by vojha | Reply

  GitHub Code

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Edit Comment 7670
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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**[GitHub Code](https://github.com/varunkojha/avahi-c)** :smile:
 
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Reply to vojha
GitHub Code
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
More Complex Markdown Help
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• Edit
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