network_analyzer_ios

The iOS implementation of network_analyzer, written in Swift (Swift Package Manager layout, with a CocoaPods podspec for compatibility).

This package is endorsed: host applications depend on network_analyzer only, and the Flutter tool wires this implementation in automatically.

Platform channel

Dart↔Swift messaging is generated by pigeon from pigeons/messages.dart:

dart run pigeon --input pigeons/messages.dart

Outputs (lib/src/messages.g.dart, Messages.g.swift) are committed after generation. Never hand-write channel code.

Permissions and entitlements

None. Real-time monitoring needs no entitlement and no Info.plist key.

Frameworks

The default gateway has no public API on iOS, so it is read from the BSD routing table through sysctl(CTL_NET, PF_ROUTE, NET_RT_DUMP). That is a public interface and passes App Store review.

ICMP

ICMP monitoring uses an unprivileged ICMP datagram socket (socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP)) — the approach Apple's own SimplePing sample takes.

IPv6

TCP and UDP probes resolve through getaddrinfo rather than a hand-built sockaddr_in, so on a NAT64/DNS64 network the system synthesises a routable IPv6 address from an IPv4 literal and monitoring keeps working. That is the network App Store review tests on.

ICMP has no such synthesis. On an IPv6-only network it returns UnsupportedCapabilityFailure rather than silently substituting another protocol.