102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package deviceagent
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import (
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"context"
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"crypto/sha256"
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"encoding/hex"
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"net"
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"os"
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"os/exec"
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"strings"
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)
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type (
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// HostInfo is the device identity reported by the agent.
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HostInfo struct {
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Hostname string
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Platform string
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OSVersion string
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HardwareUUID string
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SerialNumber *string
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}
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)
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// CollectHostInfo gathers host identity using best-effort probes.
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func CollectHostInfo() HostInfo {
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info := HostInfo{
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Platform: platformString(),
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}
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if h, err := os.Hostname(); err == nil {
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info.Hostname = h
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}
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if info.Hostname == "" {
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info.Hostname = "unknown-host"
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}
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info.OSVersion = collectOSVersion()
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info.HardwareUUID = collectHardwareUUID()
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if sn := collectSerialNumber(); sn != "" {
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info.SerialNumber = &sn
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}
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return info
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}
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// hashFallbackUUID derives a stable fallback from hostname and MAC.
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func hashFallbackUUID() string {
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hostname, _ := os.Hostname()
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mac := firstStableMAC()
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h := sha256.New()
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h.Write([]byte(hostname))
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h.Write([]byte{0})
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h.Write([]byte(mac))
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return hex.EncodeToString(h.Sum(nil))
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}
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func firstStableMAC() string {
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ifaces, err := net.Interfaces()
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if err != nil {
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return ""
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}
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for _, ifc := range ifaces {
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if ifc.Flags&net.FlagLoopback != 0 {
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continue
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}
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if len(ifc.HardwareAddr) == 0 {
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continue
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}
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return ifc.HardwareAddr.String()
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}
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return ""
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}
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// runQuiet runs a command and returns trimmed stdout.
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func runQuiet(ctx context.Context, name string, args ...string) (string, error) {
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cmd := exec.CommandContext(ctx, name, args...)
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out, err := cmd.Output()
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return strings.TrimSpace(string(out)), err
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}
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