'c_wait' - ConnectionWait v1.4

Intro:

'c_wait' is a PenetrationTesting and DevOps tool [an advanced health-check tool].
The script checks for open-connections (using user-input [args]).
And when the task is complete: The script will exit successfully (or with failure).

Examples, Where can I use this script?

• DevOps and automations: Health-check for databases before initializing the servers.

• PenetrationTesting: Display current installed health-check methods inside X machine.

---

Changelog v1.4:

• Added more health-check methods (Crystal, Picolisp, G++, Clang++, GNAT(Ada), Haskell, Swift, Kotlin, Prolog(SWI), Neko, FreePascal).
• Added an option to save output to a log file.
• Fixed small bugs and optimized health-check methods.
• Typo.

Changelog v1.3:

• Added more health-check methods (CQL-shell, Racket, Guile, Julia).
• Fixed bugs.
• Optimized methods.
• Optimized code.
• Typo.
• More validations.

Changelog v1.2:

• Added a new option to display all supported and installed methods: [ ./c_wait.sh --installed ].
• Full support for the latest BusyBox version of Telnet and Wget.
• Added more health-check methods (SSH, MongoDB-Client, Groovy, Zsh, Ocaml).
• Fixed bugs.
• Optimized methods and performance.
• Optimzed code.

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Features:

1. Optimized for Kubernetes and Docker images (including full support for the most popular OS-images: Alpine, Ubuntu, CentOS, Fedora, Debian, AmazonLinux, OracleLinux, ROS, CirrOS, Mageia, ClearLinux, SourceMage and openSUSE).
2. In addition, Full support for: BusyBox, Termux, macOS, RedHat, SUSELinux, ArchLinux, Mageia, GentooLinux, Endless, OpenBSD, FreeBSD, Solus, Guix, Slackware and other Linux distributions.
3. Supporting over 53 health-check methods, to check for open-connections.
4. Allow adding unlimited number of hosts.
5. Allow connection-modes:
   @ 'all' hosts must be connected to complete the task.
   @ 'any' of the hosts must be connected to complete the task.
6. Allow limited/forever connection-retries.
7. Option to display the installed and supported methods inside X machine.
8. Customize methods and messages (easily editable from global values).
9. Simple, user-friendly and easy to use.

Methods; health-check order:

1. Netcat
2. Bash
3. SSH
4. cURL
5. Wget
6. Telnet
7. Gawk
8. Zsh
9. Ncat
10. Nmap
11. Socat
12. Python
13. Python3
14. NodeJS
15. Ruby
16. Perl
17. PHP
18. Tcl
19. OpenSSL
20. Scala
21. Crystal
22. CQL-shell
23. Mongo-shell
24. Groovy
25. R
26. Elixir
27. Erlang
28. Clojure
29. Racket
30. Guile
31. PicoLisp
32. PowerShell
33. Julia
34. GCC
35. G++
36. Clang
37. Clang++
38. GNAT(Ada)
39. Java-JDK
40. Haskell
41. Rust
42. Go
43. SBCL
44. Dart
45. D
46. Nim
47. OCaml
48. Swift
49. Kotlin
50. .NET
51. Prolog(SWI)
52. Neko
53. FreePascal

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Default global values:

With args:

HOSTS="8.8.8.8:53 db:3306"  
SLEEP_TIME="3"  
RETRIES_COUNT="0"  
CONNECT_MODE="all"  
IS_QUIET_MODE="no"  
LOG_FILE="-"  

Without args:

METHODS="nc bash ssh curl wget telnet gawk zsh ncat nmap socat python python3 node ruby perl php tclsh openssl scala crystal cqlsh mongo groovy Rscript elixir erl clojure racket guile pil pwsh julia gcc g++ clang clang++ gnatmake javac ghc rustc go sbcl dart dmd nim ocamlc swiftc kotlinc dotnet swipl nekoc fpc"

TIMEOUT="2"

readonly INIT_MESSAGE="'c_wait' - Initializing ..."
readonly CONNECT_MESSAGE="'c_wait' - Connection Succeed!"
readonly FAIL_MESSAGE="'c_wait' - Connection Failed!"
readonly DONE_MESSAGE="'c_wait' - Task Completed :)"
readonly QUIT_MESSAGE="'c_wait' - Terminated!"

You can modify the default values (read the source-code comments).

./c_wait --help

[ 'c_wait' - ConnectionWait v1.4 ]

Usage:
  ./c_wait.sh --connect {all|any}
     --sleep <secs> --retry <num|'forever'>
     --log <file|'-'> <hosts:ports ...>

Short usage:
  ./c_wait.sh -c {all|any} -r <num|'0'>
     -s <secs> -l <file|'-'> <hosts ...>

Examples:
  ./c_wait.sh -l out.txt
  ./c_wait.sh --sleep 1 google.com 8.8.8.8:53
  ./c_wait.sh -s 4 ftp:21 192.168.1.1:22
  ./c_wait.sh --quiet -s 10 -r 3 myserver:8000
  ./c_wait.sh -c any --log - localhost myftp:21
  ./c_wait.sh --connect all -q --retry 4 tln:25

Options and default values:
  <hosts:ports ...>
     ('8.8.8.8:53 db:3306')

  -c | --connect {all|any}
     ('all' of the selected hosts)

  -s | --sleep <seconds>
     ('3' seconds)

  -r | --retry <number|'forever'>
     (connection-retries: 'forever')

  -l | --log <file|'-'>
     (log file: '')

  -q | --quiet
     (minimal output? 'no')

Display info:
  -i | --installed
     (display installed methods)

  -h | --help | /?
     (display this usage)

---

Known 'Issues':

Methods:

• Mongo-shell: Will not be able to connect to '0.0.0.0' (connection will fail).

Others:

• No support for Solaris OS (incompatible version of 'grep').

---

Example using Docker:

cat docker-compose.yml:

services:  
  db:  
    image: postgres  
    container_name: db  
    ..........  
    ..........  
    expose:  
      - '5432'
    networks:  
      - shared  
    ..........  
    ..........  

  django_app:  
    build: .  
    ..........  
    ..........  
    entrypoint: /var/www/my_app/entrypoint_django_run.sh  
    networks:  
      - shared  
    ..........  
    ..........  

networks:  
  shared:    

cat entrypoint_django_run.sh

./c_wait.sh db:5432  
python3 manage.py runserver 0.0.0.0:8000  

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alaahag@gmail.com , +972527337763

[PT & DevOPS developer, Looking for my next challenge].