Update dependencies

vendor/tailscale.com/posture/serialnumber_notmacos.go

@@ -0,0 +1,102 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Build on Windows, Linux and *BSD
+
+//go:build windows || (linux && !android) || freebsd || openbsd || dragonfly || netbsd
+
+package posture
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/digitalocean/go-smbios/smbios"
+	"tailscale.com/types/logger"
+)
+
+// getByteFromSmbiosStructure retrieves a 8-bit unsigned integer at the given specOffset.
+func getByteFromSmbiosStructure(s *smbios.Structure, specOffset int) uint8 {
+	// the `Formatted` byte slice is missing the first 4 bytes of the structure that are stripped out as header info.
+	// so we need to subtract 4 from the offset mentioned in the SMBIOS documentation to get the right value.
+	index := specOffset - 4
+	if index >= len(s.Formatted) || index < 0 {
+		return 0
+	}
+
+	return s.Formatted[index]
+}
+
+// getStringFromSmbiosStructure retrieves a string at the given specOffset.
+// Returns an empty string if no string was present.
+func getStringFromSmbiosStructure(s *smbios.Structure, specOffset int) string {
+	index := getByteFromSmbiosStructure(s, specOffset)
+
+	if index == 0 || int(index) > len(s.Strings) {
+		return ""
+	}
+
+	str := s.Strings[index-1]
+	trimmed := strings.TrimSpace(str)
+
+	return trimmed
+}
+
+// Product Table (Type 1) structure
+// https://web.archive.org/web/20220126173219/https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.1.1.pdf
+// Page 34 and onwards.
+const (
+	// Serial is present at the same offset in all IDs
+	serialNumberOffset = 0x07
+
+	productID   = 1
+	baseboardID = 2
+	chassisID   = 3
+)
+
+var (
+	idToTableName = map[int]string{
+		1: "product",
+		2: "baseboard",
+		3: "chassis",
+	}
+	validTables []string
+	numOfTables int
+)
+
+func init() {
+	for _, table := range idToTableName {
+		validTables = append(validTables, table)
+	}
+	numOfTables = len(validTables)
+}
+
+func GetSerialNumbers(logf logger.Logf) ([]string, error) {
+	// Find SMBIOS data in operating system-specific location.
+	rc, _, err := smbios.Stream()
+	if err != nil {
+		return nil, fmt.Errorf("failed to open dmi/smbios stream: %w", err)
+	}
+	defer rc.Close()
+
+	// Decode SMBIOS structures from the stream.
+	d := smbios.NewDecoder(rc)
+	ss, err := d.Decode()
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode dmi/smbios structures: %w", err)
+	}
+
+	serials := make([]string, 0, numOfTables)
+
+	for _, s := range ss {
+		switch s.Header.Type {
+		case productID, baseboardID, chassisID:
+			serial := getStringFromSmbiosStructure(s, serialNumberOffset)
+
+			if serial != "" {
+				serials = append(serials, serial)
+			}
+		}
+	}
+	return serials, nil
+}