bool netplay_send_info(netplay_t *netplay)
{
unsigned sram_size;
retro_ctx_memory_info_t mem_info;
char msg[512] = {0};
uint32_t *content_crc_ptr = NULL;
void *sram = NULL;
uint32_t header[3] = {0};
mem_info.id = RETRO_MEMORY_SAVE_RAM;
core_get_memory(&mem_info);
content_get_crc(&content_crc_ptr);
header[0] = htonl(*content_crc_ptr);
header[1] = htonl(netplay_impl_magic());
header[2] = htonl(mem_info.size);
if (!socket_send_all_blocking(netplay->fd, header, sizeof(header), false))
return false;
if (!netplay_send_nickname(netplay, netplay->fd))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_SEND_NICKNAME_TO_HOST));
return false;
}
/* Get SRAM data from User 1. */
sram = mem_info.data;
sram_size = mem_info.size;
if (!socket_receive_all_blocking(netplay->fd, sram, sram_size))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_RECEIVE_SRAM_DATA_FROM_HOST));
return false;
}
if (!netplay_get_nickname(netplay, netplay->fd))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_RECEIVE_NICKNAME_FROM_HOST));
return false;
}
snprintf(msg, sizeof(msg), "%s: \"%s\"",
msg_hash_to_str(MSG_CONNECTED_TO),
netplay->other_nick);
RARCH_LOG("%s\n", msg);
runloop_msg_queue_push(msg, 1, 180, false);
return true;
}
bool netplay_handshake(netplay_t *netplay)
{
size_t i;
uint32_t local_pmagic, remote_pmagic;
unsigned sram_size, remote_sram_size;
retro_ctx_memory_info_t mem_info;
char msg[512];
uint32_t *content_crc_ptr = NULL;
void *sram = NULL;
uint32_t header[5] = {0};
bool is_server = netplay->is_server;
int compression = 0;
msg[0] = '\0';
mem_info.id = RETRO_MEMORY_SAVE_RAM;
core_get_memory(&mem_info);
content_get_crc(&content_crc_ptr);
local_pmagic = netplay_platform_magic();
header[0] = htonl(*content_crc_ptr);
header[1] = htonl(netplay_impl_magic());
header[2] = htonl(mem_info.size);
header[3] = htonl(local_pmagic);
header[4] = htonl(NETPLAY_COMPRESSION_SUPPORTED);
if (!socket_send_all_blocking(netplay->fd, header, sizeof(header), false))
return false;
if (!socket_receive_all_blocking(netplay->fd, header, sizeof(header)))
{
strlcpy(msg, msg_hash_to_str(MSG_FAILED_TO_RECEIVE_HEADER_FROM_CLIENT), sizeof(msg));
goto error;
}
if (*content_crc_ptr != ntohl(header[0]))
{
strlcpy(msg, msg_hash_to_str(MSG_CONTENT_CRC32S_DIFFER), sizeof(msg));
goto error;
}
if (netplay_impl_magic() != ntohl(header[1]))
{
strlcpy(msg, "Implementations differ. Make sure you're using exact same "
"libretro implementations and RetroArch version.", sizeof(msg));
goto error;
}
/* Some cores only report the correct sram size late, so we can't actually
* error out if the sram size seems wrong. */
sram_size = mem_info.size;
remote_sram_size = ntohl(header[2]);
if (sram_size != 0 && remote_sram_size != 0 && sram_size != remote_sram_size)
{
RARCH_WARN("Content SRAM sizes do not correspond.\n");
}
/* We only care about platform magic if our core is quirky */
remote_pmagic = ntohl(header[3]);
if ((netplay->quirks & NETPLAY_QUIRK_ENDIAN_DEPENDENT) &&
netplay_endian_mismatch(local_pmagic, remote_pmagic))
{
RARCH_ERR("Endianness mismatch with an endian-sensitive core.\n");
strlcpy(msg, "This core does not support inter-architecture netplay "
"between these systems.", sizeof(msg));
goto error;
}
if ((netplay->quirks & NETPLAY_QUIRK_PLATFORM_DEPENDENT) &&
(local_pmagic != remote_pmagic))
{
RARCH_ERR("Platform mismatch with a platform-sensitive core.\n");
strlcpy(msg, "This core does not support inter-architecture netplay.",
sizeof(msg));
goto error;
}
/* Clear any existing compression */
if (netplay->compression_stream)
netplay->compression_backend->stream_free(netplay->compression_stream);
if (netplay->decompression_stream)
netplay->decompression_backend->stream_free(netplay->decompression_stream);
/* Check what compression is supported */
compression = ntohl(header[4]);
compression &= NETPLAY_COMPRESSION_SUPPORTED;
if (compression & NETPLAY_COMPRESSION_ZLIB)
{
netplay->compression_backend = trans_stream_get_zlib_deflate_backend();
if (!netplay->compression_backend)
netplay->compression_backend = trans_stream_get_pipe_backend();
}
else
{
netplay->compression_backend = trans_stream_get_pipe_backend();
}
netplay->decompression_backend = netplay->compression_backend->reverse;
/* Allocate our compression stream */
netplay->compression_stream = netplay->compression_backend->stream_new();
netplay->decompression_stream = netplay->decompression_backend->stream_new();
if (!netplay->compression_stream || !netplay->decompression_stream)
{
RARCH_ERR("Failed to allocate compression transcoder!\n");
return false;
}
/* Client sends nickname first, server replies with nickname */
if (!is_server)
{
if (!netplay_send_nickname(netplay, netplay->fd))
{
strlcpy(msg, msg_hash_to_str(MSG_FAILED_TO_SEND_NICKNAME_TO_HOST),
sizeof(msg));
goto error;
}
}
if (!netplay_get_nickname(netplay, netplay->fd))
{
if (is_server)
strlcpy(msg, msg_hash_to_str(MSG_FAILED_TO_GET_NICKNAME_FROM_CLIENT),
sizeof(msg));
else
strlcpy(msg,
msg_hash_to_str(MSG_FAILED_TO_RECEIVE_NICKNAME_FROM_HOST),
sizeof(msg));
goto error;
}
if (is_server)
{
if (!netplay_send_nickname(netplay, netplay->fd))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_SEND_NICKNAME_TO_CLIENT));
return false;
}
}
/* Server sends SRAM, client receives */
if (is_server)
{
/* Send SRAM data to the client */
sram = mem_info.data;
if (!socket_send_all_blocking(netplay->fd, sram, sram_size, false))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_SEND_SRAM_DATA_TO_CLIENT));
return false;
}
}
else
{
/* Get SRAM data from User 1. */
if (sram_size != 0 && sram_size == remote_sram_size)
{
sram = mem_info.data;
if (!socket_receive_all_blocking(netplay->fd, sram, sram_size))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_RECEIVE_SRAM_DATA_FROM_HOST));
return false;
}
}
else if (remote_sram_size != 0)
{
/* We can't load this, but we still need to get rid of the data */
uint32_t quickbuf;
while (remote_sram_size > 0)
{
if (!socket_receive_all_blocking(netplay->fd, &quickbuf, (remote_sram_size > sizeof(uint32_t)) ? sizeof(uint32_t) : remote_sram_size))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_RECEIVE_SRAM_DATA_FROM_HOST));
return false;
}
if (remote_sram_size > sizeof(uint32_t))
remote_sram_size -= sizeof(uint32_t);
else
remote_sram_size = 0;
}
}
}
/* Reset our frame count so it's consistent with the server */
netplay->self_frame_count = netplay->other_frame_count = 0;
netplay->read_frame_count = 1;
for (i = 0; i < netplay->buffer_size; i++)
{
netplay->buffer[i].used = false;
if (i == netplay->self_ptr)
{
netplay_delta_frame_ready(netplay, &netplay->buffer[i], 0);
netplay->buffer[i].have_remote = true;
netplay->other_ptr = i;
netplay->read_ptr = NEXT_PTR(i);
}
else
{
netplay->buffer[i].used = false;
}
}
if (is_server)
{
netplay_log_connection(&netplay->other_addr, 0, netplay->other_nick);
}
else
{
snprintf(msg, sizeof(msg), "%s: \"%s\"",
msg_hash_to_str(MSG_CONNECTED_TO),
netplay->other_nick);
RARCH_LOG("%s\n", msg);
runloop_msg_queue_push(msg, 1, 180, false);
}
return true;
error:
if (msg[0])
{
RARCH_ERR("%s\n", msg);
runloop_msg_queue_push(msg, 1, 180, false);
}
return false;
}
bool netplay_get_info(netplay_t *netplay)
{
unsigned sram_size;
uint32_t header[3];
retro_ctx_memory_info_t mem_info;
uint32_t *content_crc_ptr = NULL;
const void *sram = NULL;
if (!socket_receive_all_blocking(netplay->fd, header, sizeof(header)))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_RECEIVE_HEADER_FROM_CLIENT));
return false;
}
content_get_crc(&content_crc_ptr);
if (*content_crc_ptr != ntohl(header[0]))
{
RARCH_ERR("%s\n", msg_hash_to_str(MSG_CONTENT_CRC32S_DIFFER));
return false;
}
if (netplay_impl_magic() != ntohl(header[1]))
{
RARCH_ERR("Implementations differ, make sure you're using exact same "
"libretro implementations and RetroArch version.\n");
return false;
}
mem_info.id = RETRO_MEMORY_SAVE_RAM;
core_get_memory(&mem_info);
if (mem_info.size != ntohl(header[2]))
{
RARCH_ERR("Content SRAM sizes do not correspond.\n");
return false;
}
if (!netplay_get_nickname(netplay, netplay->fd))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_GET_NICKNAME_FROM_CLIENT));
return false;
}
/* Send SRAM data to our User 2. */
sram = mem_info.data;
sram_size = mem_info.size;
if (!socket_send_all_blocking(netplay->fd, sram, sram_size, false))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_SEND_SRAM_DATA_TO_CLIENT));
return false;
}
if (!netplay_send_nickname(netplay, netplay->fd))
{
RARCH_ERR("%s\n",
msg_hash_to_str(MSG_FAILED_TO_SEND_NICKNAME_TO_CLIENT));
return false;
}
#ifndef HAVE_SOCKET_LEGACY
netplay_log_connection(&netplay->other_addr, 0, netplay->other_nick);
#endif
return true;
}