dan
/
go-ricochet
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Cleaning up error handling 

Getting rid of lots of FATALs, now they can be handled by the calling
function.
This commit is contained in:
Sarah Jamie Lewis 2016-01-04 19:53:10 -08:00
parent 97f5982754
commit 04f99b298f
1 changed files with 43 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
ricochet.go
View File

@ -41,7 +41,7 @@ const (
// Ricochet is a protocol to conducting anonymous IM.
type Ricochet struct {
conn net.Conn
privateKey *pem.Block
privateKey *rsa.PrivateKey
logger *log.Logger
channelState map[int]int
channel chan RicochetMessage
@ -89,7 +89,9 @@ func (r *Ricochet) Init(filename string, debugLog bool) {
r.logger.Print("No valid PEM data found")
}
r.privateKey = block
r.privateKey, err = x509.ParsePKCS1PrivateKey(block.Bytes)
r.handleFatal(err, "Private key can't be decoded")
r.channelState = make(map[int]int)
r.channel = make(chan RicochetMessage)
}
@ -105,12 +107,10 @@ func (r *Ricochet) Connect(from string, to string) error {
toAddr := strings.Split(to, "|")
tcpAddr, err := net.ResolveTCPAddr("tcp", toAddr[0])
if err != nil {
r.logger.Fatal("Cannot Resolve TCP Address ", err)
return errors.New("Cannot Resolve Local TCP Address")
}
r.conn, err = net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
r.logger.Fatal("Cannot Dial TCP Address ", err)
return errors.New("Cannot Dial Local TCP Address")
}
r.logger.Print("Connected to " + to + " as " + toAddr[1])
@ -120,7 +120,6 @@ func (r *Ricochet) Connect(from string, to string) error {
r.logger.Print("Connecting to ", to+".onion:9878")
conn, err := dialSocksProxy("", to+".onion:9878")
if err != nil {
r.logger.Fatal("Cannot Dial Remove Address ", err)
return errors.New("Cannot Dial Remote Ricochet Address")
}
r.conn = conn
@ -144,7 +143,7 @@ func (r *Ricochet) Connect(from string, to string) error {
data, err := proto.Marshal(pc)
if err != nil {
r.logger.Fatal("Cannot Marshal Open Channel Message: ", err)
return errors.New("Cannot Marshal Open Channel Message")
}
r.sendPacket(data, 0)
@ -175,21 +174,18 @@ func (r *Ricochet) Connect(from string, to string) error {
hmac := mac.Sum(nil)
r.logger.Print("Got HMAC: ", hmac)
privateKey, err := x509.ParsePKCS1PrivateKey(r.privateKey.Bytes)
r.handleFatal(err, "Private key can't be decoded")
// DER Encode the Public Key
publickeybytes, err := asn1.Marshal(rsa.PublicKey{
N: privateKey.PublicKey.N,
E: privateKey.PublicKey.E,
N: r.privateKey.PublicKey.N,
E: r.privateKey.PublicKey.E,
})
signature, _ := rsa.SignPKCS1v15(nil, privateKey, crypto.SHA256, hmac)
signature, _ := rsa.SignPKCS1v15(nil, r.privateKey, crypto.SHA256, hmac)
signatureBytes := make([]byte, 128)
copy(signatureBytes[:], signature[:])
r.logger.Print("Signature Length: ", len(signatureBytes))
r.logger.Print("Public Key Length: ", len(publickeybytes), ", Bit Size: ", privateKey.PublicKey.N.BitLen())
r.logger.Print("Public Key Length: ", len(publickeybytes), ", Bit Size: ", r.privateKey.PublicKey.N.BitLen())
// Construct a Proof Message
proof := &Protocol_Data_AuthHiddenService.Proof{
@ -241,7 +237,7 @@ func (r *Ricochet) OpenChannel(channelType string, id int) error {
// SendContactRequest initiates a contact request to the server.
// Prerequisites:
// * Must have Previously issued a successful Connect()
func (r *Ricochet) SendContactRequest(nick string, message string) {
func (r *Ricochet) SendContactRequest(nick string, message string) error {
// Construct a Contact Request Channel
oc := &Protocol_Data_Control.OpenChannel{
ChannelIdentifier: proto.Int32(3),
@ -260,11 +256,11 @@ func (r *Ricochet) SendContactRequest(nick string, message string) {
data, err := proto.Marshal(pc)
if err != nil {
r.logger.Fatal("Cannot Marshal Open Channel Message: ", err)
return errors.New("Cannot Marshal Open Channel Message")
}
r.sendPacket(data, 0)
return nil
}
// SendMessage sends a Chat Message (message) to a give Channel (channel).
@ -286,7 +282,7 @@ func (r *Ricochet) SendMessage(message string, channel int) {
}
// negotiateVersion Perform version negotiation with the connected host.
func (r *Ricochet) negotiateVersion() {
func (r *Ricochet) negotiateVersion() error {
version := make([]byte, 4)
version[0] = 0x49
version[1] = 0x4D
@ -297,14 +293,15 @@ func (r *Ricochet) negotiateVersion() {
res, err := r.recv()
if len(res) != 1 || err != nil {
r.logger.Fatal("Failed Version Negotiating: ", res, err)
return errors.New("Failed Version Negotiating")
}
if res[0] != 1 {
r.logger.Fatal("Failed Version Negotiating - Invalid Version ", res)
return errors.New("Failed Version Negotiating - Invalid Version ")
}
r.logger.Print("Successfully Negotiated Version ", res[0])
return nil
}
// sendPacket places the data into a structure needed for the client to
@ -319,7 +316,6 @@ func (r *Ricochet) sendPacket(data []byte, channel int) {
fmt.Fprintf(r.conn, "%s", header)
}
// Listen blocks and waits for a new message to arrive from the connected user
// once a message has arrived, it returns the message and the channel it occured
// on, else it returns an error.
@ -372,7 +368,7 @@ func (r *Ricochet) ListenAndWait() error {
if err != nil {
r.logger.Printf("Failed to decode control packet, discarding")
break;
break
}
// Automatically accept new channels
@ -388,6 +384,7 @@ func (r *Ricochet) ListenAndWait() error {
}
data, err := proto.Marshal(pc)
// TODO we should set up some kind of error channel.
r.handleFatal(err, "error marshalling control protocol")
r.logger.Printf("Client Opening Channel: %d\n", message.ControlPacket.GetOpenChannel().GetChannelIdentifier())
@ -416,7 +413,7 @@ func (r *Ricochet) ListenAndWait() error {
message, err := r.decodePacket(packet, DATA)
if err != nil {
r.logger.Printf("Failed to decode data packet, discarding")
break;
break
}
r.channel <- message
}
@ -445,7 +442,7 @@ func (r *Ricochet) decodePacket(packet RicochetData, t MessageType) (rm Ricochet
}
if err != nil {
r.logger.Fatal("Error Unmarshalling Response", err)
return rm, errors.New("Error Unmarshalling Response")
}
return rm, err
}