fix(ns-scan): block network scan for large network (/19 or lower) #1493
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Tbaile
reviewed
Jan 29, 2026
packages/ns-api/files/ns.scan
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59
| def scan(device, interface): | ||
| ret = [] | ||
| u = EUci() | ||
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| if interface: | ||
| netmask = u.get('network', interface, 'netmask') | ||
| netmask_cidr = netmask_to_cidr_notation(netmask) | ||
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| # block arp-scan if the subnet is /19 or smaller | ||
| if netmask_cidr is not None and netmask_cidr < 20: | ||
| return utils.validation_error("subnet_too_large_for_scan") | ||
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This pull request enhances the network scanning functionality by adding subnet size validation and improving interface information. The most important changes are:
Network scanning improvements:
scanfunction to take bothdeviceandinterfaceparameters, and added logic to block ARP scans on subnets smaller than /20, returning a validation error if the subnet is too large.netmask_to_cidr_notationhelper function to convert a netmask (e.g., 255.255.0.0) into CIDR notation (e.g., 16), using theipaddressmodule.Interface listing enhancements:
list_interfacesfunction to include the netmask in CIDR notation for each interface in its output.Command-line interface updates:
interfaceparameter for scans, ensuring the new validation logic is used.Refs: #1434