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#include "message.h"
#include "cmumble.h"
#define PREAMBLE_SIZE 6
GStaticMutex write_mutex = G_STATIC_MUTEX_INIT;
static const struct {
const ProtobufCMessageDescriptor *descriptor;
const char *name;
} messages[] = {
#define MUMBLE_MSG(a,b) { &mumble_proto__##b##__descriptor, #a },
MUMBLE_MSGS
#undef MUMBLE_MSG
};
static void
add_preamble(uint8_t *buffer, uint16_t type, uint32_t len)
{
buffer[1] = (type) & 0xff;
buffer[0] = (type >> 8) & 0xff;
buffer[5] = (len) & 0xff;
buffer[4] = (len >> 8) & 0xff;
buffer[3] = (len >> 16) & 0xff;
buffer[2] = (len >> 24) & 0xff;
}
static void
get_preamble(uint8_t *buffer, int *type, int *len)
{
uint16_t msgType;
uint32_t msgLen;
msgType = buffer[1] | (buffer[0] << 8);
msgLen = buffer[5] | (buffer[4] << 8) | (buffer[3] << 16) | (buffer[2] << 24);
*type = (int)msgType;
*len = (int)msgLen;
}
void
cmumble_send_msg(struct cmumble *cm, ProtobufCMessage *msg)
{
uint8_t pad[128];
uint8_t preamble[PREAMBLE_SIZE];
int type = -1;
int i;
ProtobufCBufferSimple buffer = PROTOBUF_C_BUFFER_SIMPLE_INIT(pad);
for (i = 0; i < G_N_ELEMENTS(messages); ++i)
if (messages[i].descriptor == msg->descriptor)
type = i;
assert(type >= 0);
if (type == UDPTunnel) {
MumbleProto__UDPTunnel *tunnel = (MumbleProto__UDPTunnel *) msg;
buffer.data = tunnel->packet.data;
buffer.len = tunnel->packet.len;
buffer.must_free_data = 0;
} else {
protobuf_c_message_pack_to_buffer(msg, &buffer.base);
}
add_preamble(preamble, type, buffer.len);
g_static_mutex_lock(&write_mutex);
g_output_stream_write(cm->con.output, preamble, PREAMBLE_SIZE, NULL, NULL);
g_output_stream_write(cm->con.output, buffer.data, buffer.len, NULL, NULL);
g_static_mutex_unlock(&write_mutex);
PROTOBUF_C_BUFFER_SIMPLE_CLEAR(&buffer);
}
int
cmumble_recv_msg(struct cmumble *cm)
{
uint8_t preamble[PREAMBLE_SIZE];
ProtobufCMessage *msg;
gchar *data;
int type, len;
gssize ret;
GError *error = NULL;
g_assert(cm->callbacks);
ret = g_pollable_input_stream_read_nonblocking(cm->con.input,
preamble, PREAMBLE_SIZE,
NULL, &error);
if (ret <= 0) {
if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
return 0;
if (g_error_matches(error, G_TLS_ERROR, G_TLS_ERROR_EOF) ||
g_error_matches(error, G_TLS_ERROR, G_TLS_ERROR_MISC)) {
g_print("%s\n", error->message);
g_main_loop_quit(cm->loop);
return 0;
}
g_printerr("read failed: %ld: %d %s\n", ret,
error ? error->code : -1,
error ? error->message: "unknown");
return 0;
}
get_preamble(preamble, &type, &len);
if (!(type >= 0 && type < G_N_ELEMENTS(messages))) {
printf("unknown message type: %d\n", type);
return 0;
}
if (len <= 0) {
g_printerr("length 0\n");
return 0;
}
data = g_malloc(len);
if (data == NULL) {
g_printerr("out of mem\n");
g_main_loop_quit (cm->loop);
}
ret = g_input_stream_read(G_INPUT_STREAM(cm->con.input),
data, len, NULL, NULL);
/* tunneled udp data - not a regular protobuf message
* create dummy ProtobufCMessage */
if (type == UDPTunnel) {
MumbleProto__UDPTunnel udptunnel;
mumble_proto__udptunnel__init(&udptunnel);
udptunnel.packet.len = len;
udptunnel.packet.data = (uint8_t *) data;
if (cm->callbacks[UDPTunnel])
cm->callbacks[UDPTunnel](&udptunnel.base, cm);
g_free(data);
return 0;
}
msg = protobuf_c_message_unpack(messages[type].descriptor, NULL,
len, (uint8_t *) data);
if (msg == NULL) {
g_printerr("message unpack failure\n");
return 0;
}
if (cm->verbose)
g_print("debug: received message: %s type:%d, len:%d\n",
messages[type].name, type, len);
if (cm->callbacks[type])
cm->callbacks[type](msg, cm);
protobuf_c_message_free_unpacked(msg, NULL);
g_free(data);
return 1;
}
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