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/*
* This file is part of the libjaylink project.
*
* Copyright (C) 2015-2017 Marc Schink <jaylink-dev@marcschink.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#ifdef _WIN32
#include <winsock2.h>
#else
#include <sys/select.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include "libjaylink.h"
#include "libjaylink-internal.h"
/**
* @file
*
* Device discovery (TCP/IP).
*/
/** @cond PRIVATE */
/** Size of the advertisement message in bytes. */
#define ADV_MESSAGE_SIZE 128
/** Device discovery port number. */
#define DISC_PORT 19020
/** Size of the discovery message in bytes. */
#define DISC_MESSAGE_SIZE 64
/** Discovery timeout in milliseconds. */
#define DISC_TIMEOUT 20
/** @endcond */
static bool compare_devices(const void *a, const void *b)
{
const struct jaylink_device *dev;
const struct jaylink_device *new_dev;
dev = a;
new_dev = b;
if (dev->iface != JAYLINK_HIF_TCP)
return false;
if (memcmp(dev->ipv4_address, new_dev->ipv4_address,
sizeof(dev->ipv4_address)) != 0)
return false;
if (dev->serial_number != new_dev->serial_number)
return false;
if (memcmp(dev->mac_address, new_dev->mac_address,
sizeof(dev->mac_address)) != 0)
return false;
if (strcmp(dev->product_name, new_dev->product_name) != 0)
return false;
if (strcmp(dev->nickname, new_dev->nickname) != 0)
return false;
if (dev->hw_version.type != new_dev->hw_version.type)
return false;
if (dev->hw_version.major != new_dev->hw_version.major)
return false;
if (dev->hw_version.minor != new_dev->hw_version.minor)
return false;
if (dev->hw_version.revision != new_dev->hw_version.revision)
return false;
return true;
}
static struct jaylink_device *find_device(struct list *list,
const struct jaylink_device *dev)
{
struct list *item;
item = list_find_custom(list, &compare_devices, dev);
if (item)
return item->data;
return NULL;
}
static bool parse_adv_message(struct jaylink_device *dev,
const uint8_t *buffer)
{
struct in_addr in;
uint32_t tmp;
if (memcmp(buffer, "Found", 5) != 0)
return false;
/*
* Use inet_ntoa() instead of inet_ntop() because the latter requires
* at least Windows Vista.
*/
memcpy(&in, buffer + 16, 4);
memcpy(dev->ipv4_address, inet_ntoa(in), sizeof(dev->ipv4_address));
memcpy(dev->mac_address, buffer + 32, sizeof(dev->mac_address));
dev->has_mac_address = true;
dev->serial_number = buffer_get_u32(buffer, 48);
dev->has_serial_number = true;
tmp = buffer_get_u32(buffer, 52);
dev->hw_version.type = (tmp / 1000000) % 100;
dev->hw_version.major = (tmp / 10000) % 100;
dev->hw_version.minor = (tmp / 100) % 100;
dev->hw_version.revision = tmp % 100;
dev->has_hw_version = true;
memcpy(dev->product_name, buffer + 64, sizeof(dev->product_name));
dev->product_name[JAYLINK_PRODUCT_NAME_MAX_LENGTH - 1] = '\0';
dev->has_product_name = isprint((unsigned char)dev->product_name[0]);
memcpy(dev->nickname, buffer + 96, sizeof(dev->nickname));
dev->nickname[JAYLINK_NICKNAME_MAX_LENGTH - 1] = '\0';
dev->has_nickname = isprint((unsigned char)dev->nickname[0]);
return true;
}
static struct jaylink_device *probe_device(struct jaylink_context *ctx,
struct sockaddr_in *addr, const uint8_t *buffer)
{
struct jaylink_device tmp;
struct jaylink_device *dev;
/*
* Use inet_ntoa() instead of inet_ntop() because the latter requires
* at least Windows Vista.
*/
log_dbg(ctx, "Received advertisement message (IPv4 address = %s)",
inet_ntoa(addr->sin_addr));
if (!parse_adv_message(&tmp, buffer)) {
log_dbg(ctx, "Received invalid advertisement message");
return NULL;
}
log_dbg(ctx, "Found device (IPv4 address = %s)", tmp.ipv4_address);
log_dbg(ctx, "Device: MAC address = %02x:%02x:%02x:%02x:%02x:%02x",
tmp.mac_address[0], tmp.mac_address[1], tmp.mac_address[2],
tmp.mac_address[3], tmp.mac_address[4], tmp.mac_address[5]);
log_dbg(ctx, "Device: Serial number = %u", tmp.serial_number);
if (tmp.has_product_name)
log_dbg(ctx, "Device: Product = %s", tmp.product_name);
if (tmp.has_nickname)
log_dbg(ctx, "Device: Nickname = %s", tmp.nickname);
dev = find_device(ctx->discovered_devs, &tmp);
if (dev) {
log_dbg(ctx, "Ignoring already discovered device");
return NULL;
}
dev = find_device(ctx->devs, &tmp);
if (dev) {
log_dbg(ctx, "Using existing device instance");
return jaylink_ref_device(dev);
}
log_dbg(ctx, "Allocating new device instance");
dev = device_allocate(ctx);
if (!dev) {
log_warn(ctx, "Device instance malloc failed");
return NULL;
}
dev->iface = JAYLINK_HIF_TCP;
dev->serial_number = tmp.serial_number;
dev->has_serial_number = tmp.has_serial_number;
memcpy(dev->ipv4_address, tmp.ipv4_address, sizeof(dev->ipv4_address));
memcpy(dev->mac_address, tmp.mac_address, sizeof(dev->mac_address));
dev->has_mac_address = tmp.has_mac_address;
memcpy(dev->product_name, tmp.product_name, sizeof(dev->product_name));
dev->has_product_name = tmp.has_product_name;
memcpy(dev->nickname, tmp.nickname, sizeof(dev->nickname));
dev->has_nickname = tmp.has_nickname;
dev->hw_version = tmp.hw_version;
dev->has_hw_version = tmp.has_hw_version;
return dev;
}
/** @private */
JAYLINK_PRIV int discovery_tcp_scan(struct jaylink_context *ctx)
{
int ret;
int sock;
int opt_value;
fd_set rfds;
struct sockaddr_in addr;
size_t addr_length;
struct timeval timeout;
uint8_t buf[ADV_MESSAGE_SIZE];
struct jaylink_device *dev;
size_t length;
size_t num_devs;
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0) {
log_err(ctx, "Failed to create discovery socket");
return JAYLINK_ERR;
}
opt_value = true;
if (!socket_set_option(sock, SOL_SOCKET, SO_BROADCAST, &opt_value,
sizeof(opt_value))) {
log_err(ctx, "Failed to enable broadcast option for discovery "
"socket");
socket_close(sock);
return JAYLINK_ERR;
}
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(DISC_PORT);
addr.sin_addr.s_addr = INADDR_ANY;
if (!socket_bind(sock, (struct sockaddr *)&addr,
sizeof(struct sockaddr_in))) {
log_err(ctx, "Failed to bind discovery socket");
socket_close(sock);
return JAYLINK_ERR;
}
addr.sin_family = AF_INET;
addr.sin_port = htons(DISC_PORT);
addr.sin_addr.s_addr = INADDR_BROADCAST;
memset(buf, 0, DISC_MESSAGE_SIZE);
memcpy(buf, "Discover", 8);
log_dbg(ctx, "Sending discovery message");
length = DISC_MESSAGE_SIZE;
if (!socket_sendto(sock, (char *)buf, &length, 0,
(const struct sockaddr *)&addr, sizeof(addr))) {
log_err(ctx, "Failed to send discovery message");
socket_close(sock);
return JAYLINK_ERR_IO;
}
if (length < DISC_MESSAGE_SIZE) {
log_err(ctx, "Only sent %zu bytes of discovery message",
length);
socket_close(sock);
return JAYLINK_ERR_IO;
}
timeout.tv_sec = DISC_TIMEOUT / 1000;
timeout.tv_usec = (DISC_TIMEOUT % 1000) * 1000;
num_devs = 0;
while (true) {
FD_ZERO(&rfds);
FD_SET(sock, &rfds);
ret = select(sock + 1, &rfds, NULL, NULL, &timeout);
if (ret <= 0)
break;
if (!FD_ISSET(sock, &rfds))
continue;
length = ADV_MESSAGE_SIZE;
addr_length = sizeof(struct sockaddr_in);
if (!socket_recvfrom(sock, buf, &length, 0,
(struct sockaddr *)&addr, &addr_length)) {
log_warn(ctx, "Failed to receive advertisement "
"message");
continue;
}
/*
* Filter out messages with an invalid size. This includes the
* broadcast message we sent before.
*/
if (length != ADV_MESSAGE_SIZE)
continue;
dev = probe_device(ctx, &addr, buf);
if (dev) {
ctx->discovered_devs = list_prepend(
ctx->discovered_devs, dev);
num_devs++;
}
}
socket_close(sock);
if (ret < 0) {
log_err(ctx, "select() failed");
return JAYLINK_ERR;
}
log_dbg(ctx, "Found %zu TCP/IP device(s)", num_devs);
return JAYLINK_OK;
}
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