feature: Add IPv6 support

[adjivas]

Hello,

This PR adds the RegisterIP/BindingIP new fields for the IPv6 support and some refactors of the Sbi
For not break the previous configurations, the RegisterIPv4/BindingIPv4 are set into RegisterIP/BindingIP

The Sbi is now optional, because we can set it from the default udmSbi configuration
A lookup resolution is added to both RegisterIP/BindingIP

[andy89923]

Hi @adjivas ,

As with the free5gc/ausf#34, we are going to release the latest version on the 'next' branch.
So, this PR should be based on 'next' or wait for the release be made,
Thanks!

[andy89923]

Please rebase to the latest release, thanks!

[andy89923]

Hi @adjivas ,

The commit history should not be like this.
I would suggest that you create a new branch that only picks related commits and creates a new PR.

[adjivas]

Hello @andy89923
I fix that
Now the PR adds the IPv6 commit on the top of the history.
It's target the main branch.

[Copilot]

Pull Request Overview

This PR adds IPv6 support by introducing generic RegisterIP/BindingIP fields alongside the deprecated IPv4-specific ones, updates SB I defaulting and resolution logic, and refactors URI generation and context initialization to use netip and DNS lookups.

• Add RegisterIP/BindingIP in Sbi and migrate deprecated IPv4 fields.
• Update getSbiUri, SearchNFServiceUri, and server binding to use netip.AddrPort.
• Replace string-based IPs in context with netip.Addr, implement resolveIP and GetIpEndPoint, and extend tests for IPv6.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pkg/factory/config.go	Renamed default IPv4 constants, added RegisterIP/BindingIP, refactored Sbi.validate defaults
internal/util/search_nf_service.go	Enhanced IPv6 lookups, updated getSbiUri to parse addresses with netip
internal/util/init_context.go	Removed legacy init logic in favor of new context-based initialization
internal/sbi/server.go	Updated server binding address construction to use netip.AddrPort
internal/sbi/consumer/nrf_service.go	Populating NF profile IPv4/IPv6 addresses based on new RegisterIP
internal/context/context_test.go	Added tests covering IPv4, IPv6, deprecated fields, defaults, and ENV resolution
internal/context/context.go	Switched to netip.Addr for IPs, implemented resolveIP, GetIpEndPoint, and replaced URI methods

Comments suppressed due to low confidence (1)

internal/context/context.go:475

• Function GetIpEndPoint handles both IPv4 and IPv6 cases but lacks direct unit tests. Consider adding tests to verify correct endpoint output for each IP family.

func GetIpEndPoint(context *UDMContext) []models.IpEndPoint {

[Copilot]

After logging the parse error, the function continues using a zero-value Addr, which may produce an incorrect URI. Consider returning early or falling back to the raw ipAddress to avoid silently generating invalid addresses.

Suggested change

	logger.InitLog.Errorf("Parse RegisterIP hostname %s failed: %+v", ipAddress, err)
	logger.InitLog.Errorf("Parse RegisterIP hostname %s failed: %+v", ipAddress, err)
	return "" // Return early if parsing fails

[Copilot]

Indexing into resolvedIPs without checking its length may panic if the lookup returns no addresses. Add a length check on resolvedIPs before accessing element [0], and handle empty results.

Suggested change

	}
	resolvedIP := resolvedIPs[0].Unmap()
	if resolvedIP := resolvedIP.String(); resolvedIP != ip {
	logger.UtilLog.Infof("Lookup revolved %s into %s", ip, resolvedIP)
	return netip.Addr{} // Return zero-value address on error
	}
	if len(resolvedIPs) == 0 {
	logger.InitLog.Errorf("No addresses resolved for %s", ip)
	return netip.Addr{} // Return zero-value address if no IPs are resolved
	}
	resolvedIP := resolvedIPs[0].Unmap()
	if resolvedIP := resolvedIP.String(); resolvedIP != ip {
	logger.UtilLog.Infof("Lookup resolved %s into %s", ip, resolvedIP)

[Copilot]

Typo in log message: "Lookup revolved" should be "Lookup resolved" to accurately describe the operation.

Suggested change

	logger.UtilLog.Infof("Lookup revolved %s into %s", ip, resolvedIP)
	logger.UtilLog.Infof("Lookup resolved %s into %s", ip, resolvedIP)