118 lines
2.6 KiB
Go
118 lines
2.6 KiB
Go
package radius
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import (
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"context"
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"net"
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"time"
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)
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// Client is a RADIUS client that can exchange packets with a RADIUS server.
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type Client struct {
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// Network on which to make the connection. Defaults to "udp".
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Net string
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// Dialer to use when making the outgoing connections.
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Dialer net.Dialer
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// Interval on which to resend packet (zero or negative value means no
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// retry).
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Retry time.Duration
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// MaxPacketErrors controls how many packet parsing and validation errors
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// the client will ignore before returning the error from Exchange.
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//
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// If zero, Exchange will drop all packet parsing errors.
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MaxPacketErrors int
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// InsecureSkipVerify controls whether the client should skip verifying
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// response packets received.
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InsecureSkipVerify bool
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}
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// DefaultClient is the RADIUS client used by the Exchange function.
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var DefaultClient = &Client{}
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// Exchange uses DefaultClient to send the given RADIUS packet to the server at
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// address addr and waits for a response.
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func Exchange(ctx context.Context, packet *Packet, addr string) (*Packet, error) {
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return DefaultClient.Exchange(ctx, packet, addr)
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}
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// Exchange sends the packet to the given server and waits for a response. ctx
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// must be non-nil.
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func (c *Client) Exchange(ctx context.Context, packet *Packet, addr string) (*Packet, error) {
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if ctx == nil {
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panic("nil context")
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}
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wire, err := packet.Encode()
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if err != nil {
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return nil, err
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}
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connNet := c.Net
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if connNet == "" {
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connNet = "udp"
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}
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conn, err := c.Dialer.DialContext(ctx, connNet, addr)
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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if deadline, deadlineSet := ctx.Deadline(); deadlineSet {
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conn.SetDeadline(deadline)
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}
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conn.Write(wire)
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if c.Retry > 0 {
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retry := time.NewTicker(c.Retry)
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defer retry.Stop()
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end := make(chan struct{})
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defer close(end)
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go func() {
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for {
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select {
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case <-retry.C:
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conn.Write(wire)
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case <-ctx.Done():
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return
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case <-end:
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return
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}
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}
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}()
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}
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var packetErrorCount int
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var incoming [MaxPacketLength]byte
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for {
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n, err := conn.Read(incoming[:])
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if err != nil {
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return nil, err
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}
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received, err := Parse(incoming[:n], packet.Secret)
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if err != nil {
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packetErrorCount++
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if c.MaxPacketErrors > 0 && packetErrorCount >= c.MaxPacketErrors {
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return nil, err
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}
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continue
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}
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if !c.InsecureSkipVerify && !IsAuthenticResponse(incoming[:n], wire, packet.Secret) {
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packetErrorCount++
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if c.MaxPacketErrors > 0 && packetErrorCount >= c.MaxPacketErrors {
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return nil, &NonAuthenticResponseError{}
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}
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continue
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}
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return received, nil
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}
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}
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