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More updates to the yamux protocol

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This commit is contained in:
John Jones 2017-11-23 06:23:50 -05:00
parent 2d74c53b62
commit e05e02188a
12 changed files with 437 additions and 97 deletions
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4
conn/dialer.c
View file

@ -116,14 +116,14 @@ int libp2p_conn_dialer_join_swarm(const struct Dialer* dialer, struct Libp2pPeer
if (conn_stream == NULL)
return 0;
// multistream
struct Stream* new_stream = libp2p_net_multistream_stream_new(conn_stream);
struct Stream* new_stream = libp2p_net_multistream_stream_new(conn_stream, 0);
if (new_stream != NULL) {
// secio over multistream
new_stream = libp2p_secio_stream_new(new_stream, peer, dialer->peerstore, dialer->private_key);
if (new_stream != NULL) {
peer->sessionContext->default_stream = new_stream;
// multistream over secio
new_stream = libp2p_net_multistream_stream_new(new_stream);
new_stream = libp2p_net_multistream_stream_new(new_stream, 0);
if (new_stream != NULL) {
peer->sessionContext->default_stream = new_stream;
// yamux over multistream

2
identify/identify.c
View file

@ -397,7 +397,7 @@ struct Stream* libp2p_identify_stream_new(struct Stream* parent_stream) {
struct Stream* libp2p_identify_stream_new_with_multistream(struct Stream* parent_stream) {
if (parent_stream == NULL)
return NULL;
struct Stream* multistream = libp2p_net_multistream_stream_new(parent_stream);
struct Stream* multistream = libp2p_net_multistream_stream_new(parent_stream, 0);
struct Stream* out = libp2p_stream_new();
if (out != NULL) {
out->stream_type = STREAM_TYPE_IDENTIFY;

13
include/libp2p/net/multistream.h
View file

@ -83,10 +83,11 @@ struct Stream* libp2p_net_multistream_connect_with_timeout(const char* hostname,
* NOTE: the SessionContext should already contain the connected stream. If not, use
* libp2p_net_multistream_connect instead of this method.
*
* @param ctx the MultistreamContext
* @param ctx a MultistreamContext
* @param theyRequested true(1) if the multistream ID has already been received from the client
* @returns true(1) on success, or false(0)
*/
int libp2p_net_multistream_negotiate(struct MultistreamContext* ctx);
int libp2p_net_multistream_negotiate(struct MultistreamContext* ctx, int theyRequested);
/**
* Expect to read a message, and follow its instructions
@ -104,6 +105,12 @@ struct KademliaMessage* libp2p_net_multistream_get_message(struct Stream* stream
*/
struct StreamMessage* libp2p_net_multistream_prepare_to_send(struct StreamMessage* incoming);
struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream);
/**
* Create a new MultiStream structure
* @param parent_stream the stream
* @param they_requested true(1) if they requested it (i.e. protocol id has already been sent)
* @returns the new Stream
*/
struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream, int theyRequested);
void libp2p_net_multistream_stream_free(struct Stream* stream);

9
include/libp2p/yamux/yamux.h
View file

@ -24,6 +24,13 @@ struct YamuxContext {
int am_server;
int state; // the state of the connection
struct Libp2pVector* protocol_handlers;
/**
* What is stored here is from a read_raw call. It could
* be garbage, but it could be a decent message. It has
* been "unframed" so contains the data portion of the
* last frame captured in a read_raw call, or if it was
* empty, the data from a new read call.
*/
struct StreamMessage* buffered_message;
long buffered_message_pos;
};
@ -36,7 +43,7 @@ struct YamuxChannelContext {
// the child protocol's stream
struct Stream* child_stream;
// the channel number
int channel;
uint32_t channel;
// the window size for this channel
int window_size;
// the state of the connection

11
net/connectionstream.c
View file

@ -73,9 +73,10 @@ int libp2p_net_connection_read(void* stream_context, struct StreamMessage** msg,
int current_size = 0;
while (1) {
int retVal = socket_read(ctx->socket_descriptor, (char*)&buffer[0], 4096, 0, timeout_secs);
libp2p_logger_debug("connectionstream", "Retrieved %d bytes from socket %d.\n", retVal, ctx->socket_descriptor);
if (retVal < 1) { // get out of the loop
if (retVal < 0) // error
return -1;
return 0;
break;
}
// add what we got to the message
@ -104,13 +105,14 @@ int libp2p_net_connection_read(void* stream_context, struct StreamMessage** msg,
*msg = libp2p_stream_message_new();
struct StreamMessage* result = *msg;
if (result == NULL) {
libp2p_logger_error("connectionstream", "read: Attempted to allocate memory for message, but allocation failed.\n");
free(result_buffer);
return 0;
}
result->data = result_buffer;
result->data_size = current_size;
result->error_number = 0;
libp2p_logger_debug("connectionstream", "libp2p_connectionstream_read: Received %d bytes", result->data_size);
libp2p_logger_debug("connectionstream", "libp2p_connectionstream_read: Received %d bytes from socket %d.\n", result->data_size, ctx->socket_descriptor);
}
return current_size;
@ -148,9 +150,12 @@ int libp2p_net_connection_read_raw(void* stream_context, uint8_t* buffer, int bu
* @returns number of bytes written
*/
int libp2p_net_connection_write(void* stream_context, struct StreamMessage* msg) {
if (stream_context == NULL)
if (stream_context == NULL) {
libp2p_logger_error("connectionstream", "write called with no context.\n");
return -1;
}
struct ConnectionContext* ctx = (struct ConnectionContext*) stream_context;
libp2p_logger_debug("connectionstream", "write: About to write %d bytes to socket %d.\n", msg->data_size, ctx->socket_descriptor);
return socket_write(ctx->socket_descriptor, (char*)msg->data, msg->data_size, 0);
}

92
net/multistream.c
View file

@ -93,7 +93,8 @@ int libp2p_net_multistream_shutdown(void* protocol_context) {
* @returns true(1) on success, otherwise false(0)
*/
int libp2p_net_multistream_context_free(struct MultistreamContext* ctx) {
int retVal = ctx->stream->close(ctx->stream);
struct Stream* parent_stream = ctx->stream->parent_stream;
int retVal = parent_stream->close(parent_stream);
// regardless of retVal, free the context
// TODO: Evaluate if this is the correct way to do it:
free(ctx);
@ -200,6 +201,7 @@ int libp2p_net_multistream_read(void* stream_context, struct StreamMessage** res
size_t varint_length = 0;
for(int i = 0; i < 12; i++) {
if (parent_stream->read_raw(parent_stream->stream_context, &varint[i], 1, timeout_secs) == -1) {
libp2p_logger_debug("multistream", "read->read_raw returned false.\n");
return 0;
}
if (varint[i] >> 7 == 0) {
@ -217,11 +219,13 @@ int libp2p_net_multistream_read(void* stream_context, struct StreamMessage** res
rslts->data_size = num_bytes_requested;
rslts->data = (uint8_t*) malloc(num_bytes_requested);
if (rslts->data == NULL) {
libp2p_logger_error("multistream", "read: Attempted allocation of stream message failed.\n");
libp2p_stream_message_free(rslts);
rslts = NULL;
}
// now get the data from the parent stream
if (!parent_stream->read_raw(parent_stream->stream_context, rslts->data, rslts->data_size, timeout_secs)) {
libp2p_logger_error("multistream", "read: Was supposed to read %d bytes, but read_raw returned false.\n", num_bytes_requested);
// problem reading from the parent stream
libp2p_stream_message_free(*results);
*results = NULL;
@ -306,9 +310,10 @@ struct Stream* libp2p_net_multistream_connect_with_timeout(const char* hostname,
* libp2p_net_multistream_connect instead of this method.
*
* @param ctx a MultistreamContext
* @param theyRequested true(1) if the multistream ID has already been received from the client
* @returns true(1) on success, or false(0)
*/
int libp2p_net_multistream_negotiate(struct MultistreamContext* ctx) {
int libp2p_net_multistream_negotiate(struct MultistreamContext* ctx, int theyRequested) {
const char* protocolID = "/multistream/1.0.0\n";
struct StreamMessage outgoing;
struct StreamMessage* results = NULL;
@ -316,40 +321,48 @@ int libp2p_net_multistream_negotiate(struct MultistreamContext* ctx) {
int haveTheirs = 0;
int peek_result = 0;
// see if they're trying to send something first
peek_result = libp2p_net_multistream_peek(ctx);
/*
if (peek_result < 0) {
libp2p_logger_error("multistream", "Attempted a peek, but received an error.\n");
return 0;
if (!theyRequested) {
// see if they're trying to send something first
peek_result = libp2p_net_multistream_peek(ctx);
/*
if (peek_result < 0) {
libp2p_logger_error("multistream", "Attempted a peek, but received an error.\n");
return 0;
}
*/
if (peek_result > 0) {
libp2p_logger_debug("multistream", "negotiate: There is %d bytes waiting for us. Perhaps it is the multistream header we're expecting.\n", peek_result);
// get the protocol
//ctx->stream->parent_stream->read(ctx->stream->parent_stream->stream_context, &results, multistream_default_timeout);
libp2p_net_multistream_read(ctx, &results, multistream_default_timeout);
if (results == NULL || results->data_size == 0)
goto exit;
if (strncmp((char*)results->data, protocolID, strlen(protocolID)) != 0)
goto exit;
haveTheirs = 1;
}
}
*/
if (peek_result > 0) {
libp2p_logger_debug("multistream", "There is %d bytes waiting for us. Perhaps it is the multistream header we're expecting.\n", peek_result);
// get the protocol
//ctx->stream->parent_stream->read(ctx->stream->parent_stream->stream_context, &results, multistream_default_timeout);
libp2p_net_multistream_read(ctx, &results, multistream_default_timeout);
if (results == NULL || results->data_size == 0)
goto exit;
if (strncmp((char*)results->data, protocolID, strlen(protocolID)) != 0)
goto exit;
haveTheirs = 1;
}
// send the protocol id
outgoing.data = (uint8_t*)protocolID;
outgoing.data_size = strlen(protocolID);
if (!libp2p_net_multistream_write(ctx, &outgoing))
if (!libp2p_net_multistream_write(ctx, &outgoing)) {
libp2p_logger_debug("multistream", "negotiate: Attempted to send the multistream id, but the write failed.\n");
goto exit;
}
// wait for them to send the protocol id back
if (!haveTheirs) {
if (!theyRequested && !haveTheirs) {
libp2p_logger_debug("multistream", "negotiate: Wrote multistream id to network, awaiting reply...\n");
// expect the same back
libp2p_net_multistream_read(ctx, &results, multistream_default_timeout);
if (results == NULL || results->data_size == 0)
int retVal = libp2p_net_multistream_read(ctx, &results, multistream_default_timeout);
if (retVal == 0 || results == NULL || results->data_size == 0) {
libp2p_logger_debug("multistream", "negotiate: expected the multistream id back, but got nothing. RetVal: %d.\n", retVal);
goto exit;
if (strncmp((char*)results->data, protocolID, strlen(protocolID)) != 0)
}
if (strncmp((char*)results->data, protocolID, strlen(protocolID)) != 0) {
libp2p_logger_debug("multistream", "negotiate: Expected the multistream id back, but did not receive it. We did receive %d bytes though.\n)", results->data_size);
goto exit;
}
}
retVal = 1;
@ -374,12 +387,20 @@ int libp2p_net_multistream_read_raw(void* stream_context, uint8_t* buffer, int b
}
/**
* Create a new MultiStream structure
* @param socket_fd the file descriptor
* @param ip the IP address
* @param port the port
* We want to try and negotiate Multistream on the incoming stream
*/
struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream) {
struct Stream* libp2p_net_multistream_handshake(struct Stream* stream) {
//TODO: implement this method
return NULL;
}
/**
* Create a new MultiStream structure
* @param parent_stream the stream
* @param they_requested true(1) if they requested it (i.e. protocol id has already been sent)
* @returns the new Stream
*/
struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream, int theyRequested) {
struct Stream* out = (struct Stream*)malloc(sizeof(struct Stream));
if (out != NULL) {
out->stream_type = STREAM_TYPE_MULTISTREAM;
@ -389,6 +410,7 @@ struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream) {
out->write = libp2p_net_multistream_write;
out->peek = libp2p_net_multistream_peek;
out->read_raw = libp2p_net_multistream_read_raw;
out->negotiate = libp2p_net_multistream_handshake;
out->address = parent_stream->address;
// build MultistreamContext
struct MultistreamContext* ctx = (struct MultistreamContext*) malloc(sizeof(struct MultistreamContext));
@ -401,7 +423,8 @@ struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream) {
ctx->handlers = NULL;
ctx->session_context = NULL;
// attempt to negotiate multistream protocol
if (!libp2p_net_multistream_negotiate(ctx)) {
if (!libp2p_net_multistream_negotiate(ctx, theyRequested)) {
libp2p_logger_debug("multistream", "multistream_stream_new: negotiate failed\n");
libp2p_net_multistream_stream_free(out);
return NULL;
}
@ -418,18 +441,17 @@ struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream) {
*/
int libp2p_net_multistream_handle_message(const struct StreamMessage* msg, struct Stream* stream, void* protocol_context) {
// attempt negotiations
struct Stream* new_stream = libp2p_net_multistream_stream_new(stream);
struct Stream* new_stream = libp2p_net_multistream_stream_new(stream, 1);
if (new_stream != NULL) {
// upgrade
return stream->handle_upgrade(stream, new_stream);
}
return -1;
}
/***
* The handler to handle calls to the protocol
* @param stream_context the context
* @param handler_vector a Libp2pVector of protocol handlers
* @returns the protocol handler
*/
struct Libp2pProtocolHandler* libp2p_net_multistream_build_protocol_handler(void* handler_vector) {

12
net/server.c
View file

@ -60,20 +60,24 @@ void libp2p_net_connection (void *ptr) {
libp2p_logger_info("null", "Connection %d, count %d\n", connection_param->file_descriptor, connection_param->count);
//TODO: build a stream from the given information
struct Stream* clientStream = libp2p_net_connection_established(connection_param->file_descriptor, connection_param->ip, connection_param->port, NULL);
struct SessionContext sessionContext;
struct Stream* clientStream = libp2p_net_connection_established(connection_param->file_descriptor, connection_param->ip, connection_param->port, &sessionContext);
sessionContext.default_stream = clientStream;
if (sessionContext.default_stream == NULL)
return;
// try to read from the network
struct StreamMessage *results = NULL;
// handle the call
for(;;) {
// Read from the network
if (!clientStream->read(clientStream->stream_context, &results, DEFAULT_NETWORK_TIMEOUT)) {
if (!sessionContext.default_stream->read(sessionContext.default_stream->stream_context, &results, DEFAULT_NETWORK_TIMEOUT)) {
// problem reading
break;
}
if (results != NULL) {
retVal = libp2p_protocol_marshal(results, clientStream, connection_param->protocol_handlers);
retVal = libp2p_protocol_marshal(results, sessionContext.default_stream, connection_param->protocol_handlers);
libp2p_stream_message_free(results);
results = NULL;
}

134
test/test_yamux.h
View file

@ -356,6 +356,11 @@ int test_yamux_client_server_connect() {
fprintf(stderr, "Was supposed to get yamux protocol id, but instead received nothing.\n");
goto exit;
}
//TODO: make sure everything is negotiated and yamux is in a happy state
// hangup
yamux_stream->close(yamux_stream);
// for debugging
// sleep(30);
retVal = 1;
exit:
libp2p_net_server_stop();
@ -365,3 +370,132 @@ int test_yamux_client_server_connect() {
return retVal;
}
int test_yamux_client_server_multistream() {
int retVal = 0;
struct Libp2pVector* protocol_handlers = NULL;
struct StreamMessage* resultMessage = NULL;
libp2p_logger_add_class("connectionstream");
libp2p_logger_add_class("multistream");
libp2p_logger_add_class("yamux");
// setup
// build the protocol handler that can handle yamux
protocol_handlers = libp2p_utils_vector_new(1);
struct Libp2pProtocolHandler* handler = libp2p_yamux_build_protocol_handler(protocol_handlers);
libp2p_utils_vector_add(protocol_handlers, handler);
handler = libp2p_net_multistream_build_protocol_handler(protocol_handlers);
libp2p_utils_vector_add(protocol_handlers, handler);
// set up server
libp2p_net_server_start("127.0.0.1", 1234, protocol_handlers);
sleep(1);
// set up client (easiest to use transport dialers)
struct Dialer* dialer = libp2p_conn_dialer_new(NULL, NULL, NULL);
struct MultiAddress* server_ma = multiaddress_new_from_string("/ip4/127.0.0.1/tcp/1234");
struct Stream* stream = libp2p_conn_dialer_get_connection(dialer, server_ma);
if (stream == NULL) {
fprintf(stderr, "Unable to get stream.\n");
goto exit;
}
// have client attempt to connect to server and negotiate yamux
struct Stream* yamux_stream = libp2p_yamux_stream_new(stream, 0, protocol_handlers);
if (yamux_stream == NULL) {
fprintf(stderr, "Was supposed to get yamux protocol id, but instead received nothing.\n");
goto exit;
}
// now attempt multistream
struct Stream* multistream = libp2p_net_multistream_stream_new(yamux_stream, 0);
if (multistream == NULL) {
fprintf(stderr, "Was supposed to get a multistream, but instead got NULL.\n");
goto exit;
}
// shut down nicely
multistream->close(multistream);
retVal = 1;
exit:
libp2p_net_server_stop();
if (protocol_handlers != NULL) {
}
return retVal;
}
int test_yamux_multistream_server() {
int retVal = 0;
struct Libp2pVector* protocol_handlers = NULL;
struct StreamMessage* resultMessage = NULL;
libp2p_logger_add_class("connectionstream");
libp2p_logger_add_class("multistream");
libp2p_logger_add_class("yamux");
// setup
// build the protocol handler that can handle yamux
protocol_handlers = libp2p_utils_vector_new(1);
struct Libp2pProtocolHandler* handler = libp2p_yamux_build_protocol_handler(protocol_handlers);
libp2p_utils_vector_add(protocol_handlers, handler);
handler = libp2p_net_multistream_build_protocol_handler(protocol_handlers);
libp2p_utils_vector_add(protocol_handlers, handler);
// set up server
libp2p_net_server_start("127.0.0.1", 1234, protocol_handlers);
// debugging
sleep(120);
retVal = 1;
exit:
libp2p_net_server_stop();
if (protocol_handlers != NULL) {
}
return retVal;
}
int test_yamux_multistream_client() {
int retVal = 0;
struct Libp2pVector* protocol_handlers = NULL;
struct StreamMessage* resultMessage = NULL;
libp2p_logger_add_class("connectionstream");
libp2p_logger_add_class("multistream");
libp2p_logger_add_class("yamux");
// setup
// build the protocol handler that can handle yamux
protocol_handlers = libp2p_utils_vector_new(1);
struct Libp2pProtocolHandler* handler = libp2p_yamux_build_protocol_handler(protocol_handlers);
libp2p_utils_vector_add(protocol_handlers, handler);
handler = libp2p_net_multistream_build_protocol_handler(protocol_handlers);
libp2p_utils_vector_add(protocol_handlers, handler);
// set up client (easiest to use transport dialers)
struct Dialer* dialer = libp2p_conn_dialer_new(NULL, NULL, NULL);
struct MultiAddress* server_ma = multiaddress_new_from_string("/ip4/127.0.0.1/tcp/1234");
struct Stream* stream = libp2p_conn_dialer_get_connection(dialer, server_ma);
if (stream == NULL) {
fprintf(stderr, "Unable to get stream.\n");
goto exit;
}
// have client attempt to connect to server and negotiate yamux
struct Stream* yamux_stream = libp2p_yamux_stream_new(stream, 0, protocol_handlers);
if (yamux_stream == NULL) {
fprintf(stderr, "Was supposed to get yamux protocol id, but instead received nothing.\n");
goto exit;
}
// now attempt multistream
struct Stream* multistream = libp2p_net_multistream_stream_new(yamux_stream, 0);
if (multistream == NULL) {
fprintf(stderr, "Was supposed to get a multistream, but instead got NULL.\n");
goto exit;
}
// shut down nicely
multistream->close(multistream);
// debugging
sleep(30);
retVal = 1;
exit:
if (protocol_handlers != NULL) {
}
return retVal;
}

3
test/testit.c
View file

@ -120,6 +120,9 @@ int build_test_collection() {
add_test("test_yamux_incoming_protocol_request", test_yamux_incoming_protocol_request, 1);
add_test("test_net_server_startup_shutdown", test_net_server_startup_shutdown, 1);
add_test("test_yamux_client_server_connect", test_yamux_client_server_connect, 1);
add_test("test_yamux_client_server_multistream", test_yamux_client_server_multistream, 1);
add_test("test_yamux_multistream_server", test_yamux_multistream_server, 0);
add_test("test_yamux_multistream_client", test_yamux_multistream_client, 0);
return 1;
};

9
yamux/session.c
View file

@ -12,6 +12,7 @@
#include "libp2p/yamux/session.h"
#include "libp2p/yamux/stream.h"
#include "libp2p/yamux/yamux.h"
#include "libp2p/utils/logger.h"
static struct yamux_config dcfg = YAMUX_DEFAULT_CONFIG;
@ -283,12 +284,16 @@ int yamux_decode(void* context, const uint8_t* incoming, size_t incoming_size, s
// if we didn't initiate it, add this new channel (odd stream id is from client, even is from server)
if ( (f.streamid % 2 == 0 && yamuxContext->am_server) || (f.streamid % 2 == 1 && yamuxContext->am_server) ) {
struct Stream* yamuxChannelStream = yamux_channel_new(yamuxContext, f.streamid, msg);
if (yamuxChannelStream == NULL)
if (yamuxChannelStream == NULL) {
libp2p_logger_error("yamux", "session->yamux_decode: Unable to create new yamux channel for stream id %d.\n", f.streamid);
return -EPROTO;
}
struct YamuxChannelContext* channelContext = (struct YamuxChannelContext*)yamuxChannelStream->stream_context;
if (yamux_session->new_stream_fn)
if (yamux_session->new_stream_fn) {
libp2p_logger_debug("yamux", "session->yamux_decode: Calling new_stream_fn.\n");
yamux_session->new_stream_fn(yamuxContext, yamuxContext->stream, msg);
}
channelContext->state = yamux_stream_syn_recv;
}

9
yamux/stream.c
View file

@ -81,11 +81,12 @@ FOUND:;
};
*y_stream = nst;
/*
if (libp2p_protocol_marshal(msg, nst.stream, context->protocol_handlers) >= 0) {
// success
}
/*
struct Stream* channelStream = libp2p_yamux_channel_stream_new(context->stream);
*/
struct Stream* channelStream = libp2p_yamux_channel_stream_new(context->stream, id);
struct YamuxChannelContext* channel = (struct YamuxChannelContext*)channelStream->stream_context;
channel->channel = id;
channel->child_stream = NULL;
@ -93,8 +94,6 @@ FOUND:;
return channelStream;
*/
return 0;
}
/**
@ -280,7 +279,7 @@ ssize_t yamux_stream_write(struct YamuxChannelContext* channel_ctx, uint32_t dat
char* data = (char*)data_;
char* data_end = data + data_length;
uint32_t ws = channel_ctx->window_size;
int id = channel_ctx->channel;
uint32_t id = channel_ctx->channel;
char sendd[ws + sizeof(struct yamux_frame)];

236
yamux/yamux.c
View file

@ -9,6 +9,42 @@
#include "libp2p/conn/session.h"
#include "libp2p/utils/logger.h"
// function declarations that we don't want in the header file
int libp2p_yamux_channels_free(struct YamuxContext* ctx);
struct Stream* libp2p_yamux_get_parent_stream(void* context);
/**
* Given a context, get the YamuxChannelContext
* @param stream_context the context
* @returns the YamuxChannelContext or NULL if there was none
*/
struct YamuxChannelContext* libp2p_yamux_get_channel_context(void* stream_context) {
char proto = ((uint8_t*)stream_context)[0];
if (proto == YAMUX_CHANNEL_CONTEXT) {
return (struct YamuxChannelContext*)stream_context;
}
return NULL;
}
/***
* Given a context, get the YamuxContext
* @param stream_context a YamuxChannelContext or a YamuxContext
* @returns the YamuxContext, or NULL on error
*/
struct YamuxContext* libp2p_yamux_get_context(void* stream_context) {
char proto = ((uint8_t*)stream_context)[0];
struct YamuxChannelContext* channel = NULL;
struct YamuxContext* ctx = NULL;
if (proto == YAMUX_CHANNEL_CONTEXT) {
channel = (struct YamuxChannelContext*)stream_context;
ctx = channel->yamux_context;
} else if (proto == YAMUX_CONTEXT) {
ctx = (struct YamuxContext*)stream_context;
}
return ctx;
}
/**
* Determines if this protocol can handle the incoming message
* @param incoming the incoming data
@ -135,6 +171,35 @@ struct Libp2pProtocolHandler* libp2p_yamux_build_protocol_handler(struct Libp2pV
return handler;
}
/**
* Close the main yamux connection
* @param stream the stream to close
* @returns true(1) on success, false(0) on error
*/
int libp2p_yamux_send_go_away(struct Stream* stream) {
struct YamuxChannelContext* channel = libp2p_yamux_get_channel_context(stream->stream_context);
struct YamuxContext* ctx = libp2p_yamux_get_context(stream->stream_context);
if (ctx != NULL) {
struct StreamMessage* msg = libp2p_stream_message_new();
msg->data_size = sizeof(struct yamux_frame);
msg->data = malloc(msg->data_size);
struct yamux_frame* f = (struct yamux_frame*) msg->data;
f->type = yamux_frame_go_away;
f->flags = yamux_frame_fin;
f->streamid = 0;
f->version = 0;
f->length = 0;
if (channel != NULL) {
f->streamid = channel->channel;
}
encode_frame(f);
stream->parent_stream->write(stream->parent_stream->stream_context, msg);
libp2p_stream_message_free(msg);
return 1;
}
return 0;
}
/***
* Close the stream and clean up all resources
* NOTE: This also goes through the channels
@ -148,7 +213,9 @@ int libp2p_yamux_close(struct Stream* stream) {
return 0;
struct Stream* parent_stream = stream->parent_stream;
// this should close everything above yamux (i.e. the protocols that are riding on top of yamux)
libp2p_yamux_stream_free(stream);
libp2p_yamux_channels_free(stream->stream_context);
// send a FIN
libp2p_yamux_send_go_away(stream);
// and this should close everything below
parent_stream->close(parent_stream);
return 1;
@ -163,8 +230,10 @@ int libp2p_yamux_close(struct Stream* stream) {
* @returns true(1) on success, false(0) on failure
*/
int libp2p_yamux_read(void* stream_context, struct StreamMessage** message, int timeout_secs) {
if (stream_context == NULL)
if (stream_context == NULL) {
libp2p_logger_error("yamux", "read was passed a null context.\n");
return 0;
}
// look at the first byte of the context to determine if this is a YamuxContext (we're negotiating)
// or a YamuxChannelContext (we're talking to an established channel)
struct YamuxContext* ctx = NULL;
@ -177,26 +246,38 @@ int libp2p_yamux_read(void* stream_context, struct StreamMessage** message, int
ctx = (struct YamuxContext*)stream_context;
}
struct Stream* parent_stream = libp2p_yamux_get_parent_stream(stream_context);
if (channel != NULL && channel->channel != 0) {
// we have an established channel. Use it.
if (!channel->yamux_context->stream->parent_stream->read(channel->yamux_context->stream->parent_stream->stream_context, message, yamux_default_timeout))
if (!parent_stream->read(parent_stream->stream_context, message, yamux_default_timeout)) {
libp2p_logger_error("yamux", "Read: Attepted to read from channel %d, but the read failed.\n", channel->channel);
return 0;
}
if (message == NULL) {
libp2p_logger_error("yamux", "Read: Successfully read from channel %d, but message was NULL.\n", channel->channel);
}
// TODO: This is not right. It must be sorted out.
struct StreamMessage* msg = *message;
if (yamux_decode(channel, msg->data, msg->data_size, message) == 0)
libp2p_logger_debug("yamux", "Read: Received %d bytes on channel %d.\n", msg->data_size, channel->channel);
if (yamux_decode(channel, msg->data, msg->data_size, message) == 0) {
return 1;
}
libp2p_logger_error("yamux", "yamux_decode returned error.\n");
} else if (ctx != NULL) {
// We are still negotiating. They are probably attempting to negotiate a new protocol
struct StreamMessage* incoming = NULL;
if (ctx->stream->parent_stream->read(ctx->stream->parent_stream->stream_context, &incoming, yamux_default_timeout)) {
if (parent_stream->read(parent_stream->stream_context, &incoming, yamux_default_timeout)) {
libp2p_logger_debug("yamux", "read: successfully read %d bytes from network.\n", incoming->data_size);
// parse the frame
if (yamux_decode(ctx, incoming->data, incoming->data_size, message) == 0) {
libp2p_stream_message_free(incoming);
return 1;
}
libp2p_logger_error("yamux", "yamux_decode returned error.\n");
libp2p_stream_message_free(incoming);
}
}
libp2p_logger_error("yamux", "Unable to do network read.\n");
return 0;
}
@ -227,6 +308,23 @@ struct StreamMessage* libp2p_yamux_prepare_to_send(struct StreamMessage* incomin
}
return out;
}
/***
* Get the next usable ID for a channel
* NOTE: Also increments the yamux_session_.nextid counter
* NOTE: Odd = client, Even = server
* @param ctx the context
* @returns the next id
*/
uint32_t libp2p_yamux_get_next_id(struct YamuxContext* ctx) {
uint32_t next_id = ctx->session->nextid;
if ( (ctx->am_server && next_id % 2 == 1)
|| (!ctx->am_server && next_id % 2 == 0))
next_id += 1;
ctx->session->nextid = next_id + 1;
return next_id;
}
/***
* Write to the remote
* @param stream_context the context. Could be a YamuxContext or YamuxChannelContext
@ -256,40 +354,29 @@ int libp2p_yamux_write(void* stream_context, struct StreamMessage* message) {
struct yamux_frame* frame = (struct yamux_frame*)outgoing_message->data;
// set a few more flags
frame->flags = get_flags(stream_context);
if (channel != NULL)
if (channel == NULL) {
// if we don't yet have a channel, set the id to the next available
frame->streamid = libp2p_yamux_get_next_id(ctx);
} else {
frame->streamid = channel->channel;
}
encode_frame(frame);
int retVal = 0;
if (channel != NULL && channel->channel != 0) {
// we have an established channel. Use it.
retVal = channel->stream->write(channel->stream->stream_context, outgoing_message);
libp2p_logger_debug("yamux", "About to write %d bytes to yamux channel %d.\n", outgoing_message->data_size, channel->channel);
struct Stream* parent_stream = libp2p_yamux_get_parent_stream(stream_context);
retVal = parent_stream->write(parent_stream->stream_context, outgoing_message);
} else if (ctx != NULL) {
retVal = ctx->stream->parent_stream->write(ctx->stream->parent_stream, outgoing_message);
libp2p_logger_debug("yamux", "About to write %d bytes to stream.\n", outgoing_message->data_size);
retVal = ctx->stream->parent_stream->write(ctx->stream->parent_stream->stream_context, outgoing_message);
}
libp2p_stream_message_free(outgoing_message);
return retVal;
}
/***
* Given a context, get the YamuxContext
* @param stream_context a YamuxChannelContext or a YamuxContext
* @returns the YamuxContext, or NULL on error
*/
struct YamuxContext* libp2p_yamux_get_context(void* stream_context) {
char proto = ((uint8_t*)stream_context)[0];
struct YamuxChannelContext* channel = NULL;
struct YamuxContext* ctx = NULL;
if (proto == YAMUX_CHANNEL_CONTEXT) {
channel = (struct YamuxChannelContext*)stream_context;
ctx = channel->yamux_context;
} else if (proto == YAMUX_CONTEXT) {
ctx = (struct YamuxContext*)stream_context;
}
return ctx;
}
/***
* Check to see if there is anything waiting on the network.
* @param stream_context the YamuxContext
@ -321,15 +408,19 @@ int libp2p_yamux_read_raw(void* stream_context, uint8_t* buffer, int buffer_size
return -1;
}
struct YamuxContext* ctx = libp2p_yamux_get_context(stream_context);
if (ctx->buffered_message_pos == -1) {
if (ctx->buffered_message_pos == -1 || ctx->buffered_message == NULL) {
// we need to get info from the network
if (!ctx->stream->read(ctx->stream->stream_context, &ctx->buffered_message, timeout_secs)) {
if (!libp2p_yamux_read(stream_context, &ctx->buffered_message, timeout_secs)) {
libp2p_logger_error("yamux", "read_raw: Unable to read from network.\n");
return -1;
}
ctx->buffered_message_pos = 0;
} else {
// we have some data from a previous read_raw call the code
// below should handle this.
}
// max_to_read is the lesser of bytes read or buffer_size
int max_to_read = (buffer_size > ctx->buffered_message->data_size ? ctx->buffered_message->data_size : buffer_size);
int max_to_read = (buffer_size > (ctx->buffered_message->data_size-ctx->buffered_message_pos) ? ctx->buffered_message->data_size-ctx->buffered_message_pos : buffer_size);
memcpy(buffer, &ctx->buffered_message->data[ctx->buffered_message_pos], max_to_read);
ctx->buffered_message_pos += max_to_read;
if (ctx->buffered_message_pos == ctx->buffered_message->data_size) {
@ -397,6 +488,7 @@ int libp2p_yamux_negotiate(struct YamuxContext* ctx, int am_server) {
// send the protocol id
outgoing.data = (uint8_t*)protocolID;
outgoing.data_size = strlen(protocolID);
libp2p_logger_debug("yamux", "Attempting to write the yamux protocol id.\n");
if (!ctx->stream->parent_stream->write(ctx->stream->parent_stream->stream_context, &outgoing)) {
libp2p_logger_error("yamux", "We attempted to write the yamux protocol id, but the write call failed.\n");
goto exit;
@ -436,6 +528,13 @@ int libp2p_yamux_negotiate(struct YamuxContext* ctx, int am_server) {
*/
int libp2p_yamux_handle_upgrade(struct Stream* yamux_stream, struct Stream* new_stream) {
// put this stream in the collection, and tie it to an id
if (libp2p_logger_watching_class("yamux")) {
const char* stream_type = "";
if (new_stream->stream_type == STREAM_TYPE_MULTISTREAM) {
stream_type = "Multistream";
}
libp2p_logger_debug("yamux", "handle_upgrade called for stream %s.\n", stream_type);
}
struct YamuxContext* yamux_context = (struct YamuxContext*)yamux_stream->stream_context;
return libp2p_yamux_stream_add(yamux_context, new_stream);
}
@ -451,7 +550,7 @@ void libp2p_yamux_read_from_yamux_session(struct yamux_stream* stream, uint32_t
*/
void libp2p_yamux_new_stream(struct YamuxContext* context, struct Stream* stream, struct StreamMessage* msg) {
// ok, we have the new stream structure. We now need to read what was sent.
libp2p_protocol_marshal(msg, stream, context->protocol_handlers);
//libp2p_protocol_marshal(msg, stream, context->protocol_handlers);
}
/***
@ -493,6 +592,49 @@ struct Stream* libp2p_yamux_stream_new(struct Stream* parent_stream, int am_serv
return out;
}
/***
* This will retrieve the stream that yamux is riding on top of
* @param context a YamuxContext or YamuxChannelContext
* @returns the Stream that yamux is riding on top of
*/
struct Stream* libp2p_yamux_get_parent_stream(void* context) {
if (context == NULL)
return NULL;
struct YamuxContext* ctx = libp2p_yamux_get_context(context);
if (ctx == NULL)
return NULL;
return ctx->stream->parent_stream;
}
/***
* Sends a FIN to close a channel
* @param channel the channel to close
* @returns true(1) on success, false(0) otherwise
*/
int libp2p_yamux_channel_send_FIN(struct YamuxChannelContext* channel) {
if (channel == NULL)
return 0;
struct YamuxContext* ctx = channel->yamux_context;
if (ctx != NULL) {
struct StreamMessage* msg = libp2p_stream_message_new();
msg->data_size = sizeof(struct yamux_frame);
msg->data = malloc(msg->data_size);
struct yamux_frame* f = (struct yamux_frame*) msg->data;
f->type = yamux_frame_window_update;
f->flags = yamux_frame_fin;
f->streamid = channel->channel;
f->version = 0;
f->length = 0;
encode_frame(f);
struct Stream* parent_to_yamux = libp2p_yamux_get_parent_stream(channel);
if (parent_to_yamux != NULL)
parent_to_yamux->write(parent_to_yamux->stream_context, msg);
libp2p_stream_message_free(msg);
return 1;
}
return 0;
}
/**
* Clean up resources from libp2p_yamux_channel_new
@ -503,6 +645,8 @@ int libp2p_yamux_channel_close(void* context) {
return 0;
struct YamuxChannelContext* ctx = (struct YamuxChannelContext*)context;
if (ctx != NULL) {
//Send FIN
libp2p_yamux_channel_send_FIN(ctx);
// close the child's stream
ctx->child_stream->close(ctx->child_stream);
libp2p_stream_free(ctx->stream);
@ -511,6 +655,23 @@ int libp2p_yamux_channel_close(void* context) {
return 1;
}
/***
* Close all channels
* @param ctx the YamuxContext that contains a vector of channels
* @returns true(1)
*/
int libp2p_yamux_channels_free(struct YamuxContext* ctx) {
if (ctx->channels) {
for(int i = 0; i < ctx->channels->total; i++) {
struct Stream* curr = (struct Stream*) libp2p_utils_vector_get(ctx->channels, i);
libp2p_yamux_channel_close(curr->stream_context);
}
libp2p_utils_vector_free(ctx->channels);
ctx->channels = NULL;
}
return 1;
}
/***
* Free the resources from libp2p_yamux_context_new
* @param ctx the context
@ -523,14 +684,7 @@ void libp2p_yamux_context_free(struct YamuxContext* ctx) {
ctx->buffered_message = NULL;
}
// free all the channels
if (ctx->channels) {
for(int i = 0; i < ctx->channels->total; i++) {
struct Stream* curr = (struct Stream*) libp2p_utils_vector_get(ctx->channels, i);
//curr->close(curr->stream_context);
libp2p_yamux_channel_close(curr->stream_context);
}
libp2p_utils_vector_free(ctx->channels);
}
libp2p_yamux_channels_free(ctx);
if (ctx->session != NULL)
yamux_session_free(ctx->session);
free(ctx);
@ -602,7 +756,7 @@ struct Stream* libp2p_yamux_channel_stream_new(struct Stream* incoming_stream, i
ctx->yamux_context = incoming_stream->stream_context;
ctx->child_stream = NULL;
}
ctx->channel = channelNumber;
ctx->channel = (uint32_t) channelNumber;
ctx->closed = 0;
ctx->state = 0;
ctx->window_size = 0;
@ -628,7 +782,7 @@ int libp2p_yamux_stream_add(struct YamuxContext* ctx, struct Stream* stream) {
return 0;
struct YamuxChannelContext* channel_context = (struct YamuxChannelContext*)channel_stream->stream_context;
// the negotiation was successful. Add it to the list of channels that we have
int itemNo = libp2p_utils_vector_add(ctx->channels, channel_stream);
uint32_t itemNo = (uint32_t) libp2p_utils_vector_add(ctx->channels, channel_stream);
// There are 2 streams for each protocol. A server has the even numbered streams, the
// client the odd number streams. If we are the server, we need to kick off the
// process to add a stream of the same type.
@ -636,7 +790,7 @@ int libp2p_yamux_stream_add(struct YamuxContext* ctx, struct Stream* stream) {
if (ctx->am_server && itemNo % 2 != 0) {
// we're the server, and they have a negotiated a new protocol.
// negotiate a stream for us to talk to them.
struct Stream* yamux_stream = stream->parent_stream->parent_stream;
struct Stream* yamux_stream = ctx->stream;
struct Stream* server_to_client_stream = stream->negotiate(yamux_stream);
libp2p_yamux_stream_add(ctx, server_to_client_stream);
}