Make KnownHostsFile safe for concurrent use
This commit is contained in:
parent
846fa2ac41
commit
e687a05170
17
tofu.go
17
tofu.go
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@ -25,18 +25,25 @@ type KnownHosts map[string]Fingerprint
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// KnownHostsFile represents a list of known hosts optionally loaded from a file.
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// KnownHostsFile represents a list of known hosts optionally loaded from a file.
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// The zero value for KnownHostsFile represents an empty list ready to use.
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// The zero value for KnownHostsFile represents an empty list ready to use.
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//
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// KnownHostsFile is safe for concurrent use by multiple goroutines.
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type KnownHostsFile struct {
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type KnownHostsFile struct {
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KnownHosts
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KnownHosts
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out io.Writer
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out io.Writer
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mu sync.Mutex
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}
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}
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// SetOutput sets the output to which new known hosts will be written to.
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// SetOutput sets the output to which new known hosts will be written to.
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func (k *KnownHostsFile) SetOutput(w io.Writer) {
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func (k *KnownHostsFile) SetOutput(w io.Writer) {
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k.mu.Lock()
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defer k.mu.Unlock()
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k.out = w
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k.out = w
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}
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}
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// Add adds a known host to the list of known hosts.
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// Add adds a known host to the list of known hosts.
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func (k *KnownHostsFile) Add(hostname string, fingerprint Fingerprint) {
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func (k *KnownHostsFile) Add(hostname string, fingerprint Fingerprint) {
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k.mu.Lock()
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defer k.mu.Unlock()
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if k.KnownHosts == nil {
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if k.KnownHosts == nil {
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k.KnownHosts = KnownHosts{}
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k.KnownHosts = KnownHosts{}
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}
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}
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@ -46,12 +53,16 @@ func (k *KnownHostsFile) Add(hostname string, fingerprint Fingerprint) {
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// Lookup returns the fingerprint of the certificate corresponding to
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// Lookup returns the fingerprint of the certificate corresponding to
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// the given hostname.
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// the given hostname.
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func (k *KnownHostsFile) Lookup(hostname string) (Fingerprint, bool) {
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func (k *KnownHostsFile) Lookup(hostname string) (Fingerprint, bool) {
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k.mu.RLock()
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defer k.mu.RUnlock()
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c, ok := k.KnownHosts[hostname]
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c, ok := k.KnownHosts[hostname]
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return c, ok
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return c, ok
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}
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}
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// Write writes a known hosts entry to the configured output.
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// Write writes a known hosts entry to the configured output.
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func (k *KnownHostsFile) Write(hostname string, fingerprint Fingerprint) {
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func (k *KnownHostsFile) Write(hostname string, fingerprint Fingerprint) {
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k.mu.RLock()
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defer k.mu.RUnlock()
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if k.out != nil {
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if k.out != nil {
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k.writeKnownHost(k.out, hostname, fingerprint)
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k.writeKnownHost(k.out, hostname, fingerprint)
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}
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}
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@ -59,6 +70,8 @@ func (k *KnownHostsFile) Write(hostname string, fingerprint Fingerprint) {
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// WriteAll writes all of the known hosts to the provided io.Writer.
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// WriteAll writes all of the known hosts to the provided io.Writer.
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func (k *KnownHostsFile) WriteAll(w io.Writer) error {
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func (k *KnownHostsFile) WriteAll(w io.Writer) error {
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k.mu.RLock()
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defer k.mu.RUnlock()
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for h, c := range k.KnownHosts {
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for h, c := range k.KnownHosts {
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if _, err := k.writeKnownHost(w, h, c); err != nil {
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if _, err := k.writeKnownHost(w, h, c); err != nil {
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return err
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return err
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@ -76,6 +89,8 @@ func (k *KnownHostsFile) writeKnownHost(w io.Writer, hostname string, f Fingerpr
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// It creates the file if it does not exist.
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// It creates the file if it does not exist.
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// New known hosts will be appended to the file.
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// New known hosts will be appended to the file.
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func (k *KnownHostsFile) Load(path string) error {
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func (k *KnownHostsFile) Load(path string) error {
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k.mu.Lock()
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defer k.mu.Unlock()
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f, err := os.OpenFile(path, os.O_CREATE|os.O_RDONLY, 0644)
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f, err := os.OpenFile(path, os.O_CREATE|os.O_RDONLY, 0644)
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if err != nil {
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if err != nil {
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return err
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return err
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@ -94,6 +109,8 @@ func (k *KnownHostsFile) Load(path string) error {
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// Parse parses the provided reader and adds the parsed known hosts to the list.
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// Parse parses the provided reader and adds the parsed known hosts to the list.
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// Invalid entries are ignored.
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// Invalid entries are ignored.
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func (k *KnownHostsFile) Parse(r io.Reader) {
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func (k *KnownHostsFile) Parse(r io.Reader) {
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k.mu.Lock()
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defer k.mu.Unlock()
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if k.KnownHosts == nil {
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if k.KnownHosts == nil {
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k.KnownHosts = map[string]Fingerprint{}
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k.KnownHosts = map[string]Fingerprint{}
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}
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}
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