mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-25 08:05:17 +00:00
144 lines
3.3 KiB
Go
144 lines
3.3 KiB
Go
package libp2pwebrtc
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import (
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"crypto"
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"fmt"
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"net"
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"strings"
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"github.com/multiformats/go-multihash"
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)
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// clientSDP describes an SDP format string which can be used
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// to infer a client's SDP offer from the incoming STUN message.
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// The fingerprint used to render a client SDP is arbitrary since
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// it fingerprint verification is disabled in favour of a noise
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// handshake. The max message size is fixed to 16384 bytes.
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const clientSDP = `v=0
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o=- 0 0 IN %[1]s %[2]s
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s=-
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c=IN %[1]s %[2]s
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t=0 0
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m=application %[3]d UDP/DTLS/SCTP webrtc-datachannel
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a=mid:0
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a=ice-options:ice2
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a=ice-ufrag:%[4]s
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a=ice-pwd:%[4]s
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a=fingerprint:sha-256 ba:78:16:bf:8f:01:cf:ea:41:41:40:de:5d:ae:22:23:b0:03:61:a3:96:17:7a:9c:b4:10:ff:61:f2:00:15:ad
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a=setup:actpass
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a=sctp-port:5000
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a=max-message-size:16384
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`
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func createClientSDP(addr *net.UDPAddr, ufrag string) string {
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ipVersion := "IP4"
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if addr.IP.To4() == nil {
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ipVersion = "IP6"
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}
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return fmt.Sprintf(
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clientSDP,
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ipVersion,
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addr.IP,
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addr.Port,
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ufrag,
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)
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}
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// serverSDP defines an SDP format string used by a dialer
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// to infer the SDP answer of a server based on the provided
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// multiaddr, and the locally set ICE credentials. The max
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// message size is fixed to 16384 bytes.
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const serverSDP = `v=0
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o=- 0 0 IN %[1]s %[2]s
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s=-
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t=0 0
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a=ice-lite
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m=application %[3]d UDP/DTLS/SCTP webrtc-datachannel
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c=IN %[1]s %[2]s
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a=mid:0
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a=ice-options:ice2
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a=ice-ufrag:%[4]s
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a=ice-pwd:%[4]s
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a=fingerprint:%[5]s
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a=setup:passive
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a=sctp-port:5000
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a=max-message-size:16384
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a=candidate:1 1 UDP 1 %[2]s %[3]d typ host
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a=end-of-candidates
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`
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func createServerSDP(addr *net.UDPAddr, ufrag string, fingerprint multihash.DecodedMultihash) (string, error) {
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ipVersion := "IP4"
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if addr.IP.To4() == nil {
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ipVersion = "IP6"
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}
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sdpString, err := getSupportedSDPString(fingerprint.Code)
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if err != nil {
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return "", err
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}
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var builder strings.Builder
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builder.Grow(len(fingerprint.Digest)*3 + 8)
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builder.WriteString(sdpString)
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builder.WriteByte(' ')
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builder.WriteString(encodeInterspersedHex(fingerprint.Digest))
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fp := builder.String()
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return fmt.Sprintf(
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serverSDP,
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ipVersion,
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addr.IP,
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addr.Port,
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ufrag,
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fp,
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), nil
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}
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// getSupportedSDPHash converts a multihash code to the
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// corresponding crypto.Hash for supported protocols. If a
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// crypto.Hash cannot be found, it returns `(0, false)`
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func getSupportedSDPHash(code uint64) (crypto.Hash, bool) {
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switch code {
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case multihash.MD5:
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return crypto.MD5, true
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case multihash.SHA1:
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return crypto.SHA1, true
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case multihash.SHA3_224:
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return crypto.SHA3_224, true
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case multihash.SHA2_256:
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return crypto.SHA256, true
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case multihash.SHA3_384:
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return crypto.SHA3_384, true
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case multihash.SHA2_512:
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return crypto.SHA512, true
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default:
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return 0, false
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}
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}
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// getSupportedSDPString converts a multihash code
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// to a string format recognised by pion for fingerprint
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// algorithms
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func getSupportedSDPString(code uint64) (string, error) {
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// values based on (cryto.Hash).String()
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switch code {
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case multihash.MD5:
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return "md5", nil
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case multihash.SHA1:
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return "sha-1", nil
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case multihash.SHA3_224:
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return "sha3-224", nil
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case multihash.SHA2_256:
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return "sha-256", nil
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case multihash.SHA3_384:
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return "sha3-384", nil
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case multihash.SHA2_512:
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return "sha-512", nil
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default:
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return "", fmt.Errorf("unsupported hash code (%d)", code)
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}
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}
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