gentpan
4741d40e1b
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72 lines
3.6 KiB
Swift
72 lines
3.6 KiB
Swift
import Darwin
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import Foundation
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import SystemConfiguration
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public struct NetworkSampler {
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private var last: (download: UInt64, upload: UInt64, time: UInt64)?
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public init() {}
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/// `getifaddrs` 中的 `if_data.ifi_ibytes` 只有 32 位，超过 4 GiB 会回绕；
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/// 这里用 NET_RT_IFLIST2 读取 `if_data64`。
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private static func counters() -> (download: UInt64, upload: UInt64)? {
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var mib: [Int32] = [CTL_NET, PF_ROUTE, 0, 0, NET_RT_IFLIST2, 0]
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var length = 0
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guard sysctl(&mib, u_int(mib.count), nil, &length, nil, 0) == 0 else { return nil }
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var buffer = [UInt8](repeating: 0, count: length)
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guard sysctl(&mib, u_int(mib.count), &buffer, &length, nil, 0) == 0 else { return nil }
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var download: UInt64 = 0
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var upload: UInt64 = 0
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buffer.withUnsafeBytes { raw in
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var offset = 0
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while offset + MemoryLayout<if_msghdr>.size <= length {
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let header = raw.loadUnaligned(fromByteOffset: offset, as: if_msghdr.self)
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guard header.ifm_msglen > 0 else { break }
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if Int32(header.ifm_type) == RTM_IFINFO2,
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offset + MemoryLayout<if_msghdr2>.size <= length {
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let header2 = raw.loadUnaligned(fromByteOffset: offset, as: if_msghdr2.self)
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if header2.ifm_flags & IFF_LOOPBACK == 0 {
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download += header2.ifm_data.ifi_ibytes
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upload += header2.ifm_data.ifi_obytes
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}
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}
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offset += Int(header.ifm_msglen)
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}
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}
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return (download, upload)
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}
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public mutating func sample() -> NetworkRate? {
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guard let now = Self.counters() else { return nil }
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let time = clock_gettime_nsec_np(CLOCK_UPTIME_RAW)
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defer { last = (now.download, now.upload, time) }
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guard let last, time > last.time else { return nil }
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let seconds = Double(time - last.time) / 1_000_000_000
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// 接口重置时计数器可能变小，此时本次速率记为 0
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let down = now.download >= last.download ? Double(now.download - last.download) / seconds : 0
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let up = now.upload >= last.upload ? Double(now.upload - last.upload) / seconds : 0
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return NetworkRate(downloadBytesPerSecond: down, uploadBytesPerSecond: up,
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totalDownloaded: now.download, totalUploaded: now.upload)
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}
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public static func primaryInterface() -> NetworkInterfaceInfo? {
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guard let store = SCDynamicStoreCreate(nil, "OpenStats" as CFString, nil, nil),
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let global = SCDynamicStoreCopyValue(store, "State:/Network/Global/IPv4" as CFString) as? [String: Any],
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let bsdName = global["PrimaryInterface"] as? String else { return nil }
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let interfaces = SCNetworkInterfaceCopyAll() as? [SCNetworkInterface] ?? []
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let systemName = interfaces
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.first { SCNetworkInterfaceGetBSDName($0) as String? == bsdName }
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.flatMap { SCNetworkInterfaceGetLocalizedDisplayName($0) as String? }
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// utun / ipsec / ppp 是 VPN 或代理隧道，系统不提供显示名
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let tunnelPrefixes = ["utun", "ipsec", "ppp"]
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let displayName = systemName
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?? (tunnelPrefixes.contains { bsdName.hasPrefix($0) } ? "VPN 隧道" : bsdName)
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let state = SCDynamicStoreCopyValue(store, "State:/Network/Interface/\(bsdName)/IPv4" as CFString) as? [String: Any]
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let address = (state?["Addresses"] as? [String])?.first
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return NetworkInterfaceInfo(bsdName: bsdName, displayName: displayName, ipv4: address)
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}
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}
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