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Github commit, tested with screen shots:
https://github.com/pfsense/FreeBSD-ports/pull/1148

Note: it properly supports too big files like the packet capture command: will display a warning with path to the log file to download

Add a working test patch that can be copied into System Patches package:

Phil Wardt wrote in #note-2:

Add a working test patch that can be copied into System Patches package:

Added option to refresh/delete scan results log:
- if scan in progress: display refresh button
- if no scan results: no button is shown
- if scan results are present and no scan is running, offer clear scan results button

New patch file attached

Phil Wardt wrote in #note-3:

Phil Wardt wrote in #note-2:

Add a working test patch that can be copied into System Patches package:

Added option to refresh/delete scan results log:
- if scan in progress: display refresh button
- if no scan results: no button is shown
- if scan results are present and no scan is running, offer clear scan results button

New patch file attached

A last one with a small optimisation: use php file_get_contents instead of system calls

Standardize nmap text in description: NMap -> Nmap
https://github.com/pfsense/FreeBSD-ports/pull/1148

PR merged, thanks!

Again, noticed the delete icon resource
https://github.com/pfsense/FreeBSD-ports/pull/1152

After the last nmap changes, I wanted to harmonize the package with "Packet Capture"
https://github.com/pfsense/FreeBSD-ports/pull/1154

Source of nmap_scan.php followed packet capture php source and I made it a bit more structured
I also added a few features

Here are the log changes:

• replace deprecated scan options (-sP)
• use nmap built-in -oN summarized output format for results log
• allow custom scan options
• add support for IPsec and localhost interfaces
• for -d option to no more allow deprecated options

• use same tab for all operations (harmonize gui with Packet Capture)
• allow stop of running nmap processes started by gui
• display error messages and command errors in a results error field
• allow refresh results without stopping scan
• default append to results log
• properly summarized nmap log using -oN option
• properly display the full command in output file using -oN option
• hide detailed info in spannable tool tips

Images attached
Patch file attached: for testing, access with your pfsense.address/nmap_scan.php

I modified the code to disable any custom commands.
This is safer since nmap already changed in the past the -o option syntax and could do again in future.
I added a few more useful scan methods, ports syntax support, multiple hosts as per nmap syntax, and a few more options.
New screens attached

Patch file attached: for testing, access with url pfsense.address/nmap_scan.php

Updated patch to fix this:
- only kill nmap process using the output file created in GUI
- code formatting

Add No DNS Resolution option for faster scans
Should be completed

Attached patch for pfsense 2.6.0

I squashed commits since the last review
I reviewed and cleaned up some code readability
Updated the attached patch with the small code cleanup, no change in function

Merged to devel for testing in snapshots.