fix: handle comma-separated entries in -l/-list and stdin input

[Rhan2020]

Proposed Changes

Fixes #859

Problem

The -l/-list file input and stdin treat each line as a single target, not splitting on commas like the -u option does. This causes comma-separated entries (e.g. 192.168.1.0/24,192.168.2.0/24) to fail with no address found for host errors because the entire comma-separated string is treated as a single hostname.

Solution

Add comma-splitting logic in processInputItem so it applies uniformly to all input sources in a single place. When input contains a comma, it is split, trimmed, and each non-empty item is processed individually via recursive call.

This approach differs from previous attempts that duplicated the split logic at each call site (file reader and stdin reader). By handling it in processInputItem, the fix is DRY and automatically covers any future input sources.

Changes

• Modified processInputItem in internal/runner/runner.go to detect and split comma-separated entries
• Added 3 tests:
  • Test_InputCommaSeparated_processInputItem — comma-separated domains
  • Test_InputCommaSeparatedCIDR_processInputItem — comma-separated CIDRs
  • Test_InputListCommaSeparated_normalizeAndQueueInputs — comma-separated entries from file input

Proof

Before (single line fails):

echo "192.168.1.1,192.168.2.1" > /tmp/test.txt
./tlsx -l /tmp/test.txt -p 443
# [WRN] Could not connect input 192.168.1.1,192.168.2.1:443

After (both hosts processed separately):

echo "192.168.1.1,192.168.2.1" > /tmp/test.txt
./tlsx -l /tmp/test.txt -p 443
# Scans 192.168.1.1:443 and 192.168.2.1:443 separately

Checklist

• PR created against the correct branch (dev)
• All checks passed (lint, unit/integration/regression tests)
• No dependency changes (go.mod/go.sum untouched)

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