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/*
* hdhomerun_discover.c
*
* Copyright © 2006-2010 Silicondust USA Inc. <www.silicondust.com>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "hdhomerun.h"
#define HDHOMERUN_DISOCVER_MAX_SOCK_COUNT 16
struct hdhomerun_discover_sock_t {
hdhomerun_sock_t sock;
bool_t detected;
uint32_t local_ip;
uint32_t subnet_mask;
};
struct hdhomerun_discover_t {
struct hdhomerun_discover_sock_t socks[HDHOMERUN_DISOCVER_MAX_SOCK_COUNT];
unsigned int sock_count;
struct hdhomerun_pkt_t tx_pkt;
struct hdhomerun_pkt_t rx_pkt;
struct hdhomerun_debug_t *dbg;
};
static bool_t hdhomerun_discover_sock_add(struct hdhomerun_discover_t *ds, uint32_t local_ip, uint32_t subnet_mask)
{
unsigned int i;
for (i = 1; i < ds->sock_count; i++) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[i];
if ((dss->local_ip == local_ip) && (dss->subnet_mask == subnet_mask)) {
dss->detected = TRUE;
return TRUE;
}
}
if (ds->sock_count >= HDHOMERUN_DISOCVER_MAX_SOCK_COUNT) {
return FALSE;
}
/* Create socket. */
hdhomerun_sock_t sock = hdhomerun_sock_create_udp();
if (sock == HDHOMERUN_SOCK_INVALID) {
return FALSE;
}
/* Bind socket. */
if (!hdhomerun_sock_bind(sock, local_ip, 0, FALSE)) {
hdhomerun_debug_printf(ds->dbg, "discover: failed to bind to %u.%u.%u.%u:0\n", (unsigned int)(local_ip >> 24) & 0xFF, (unsigned int)(local_ip >> 16) & 0xFF, (unsigned int)(local_ip >> 8) & 0xFF, (unsigned int)(local_ip >> 0) & 0xFF);
hdhomerun_sock_destroy(sock);
return FALSE;
}
/* Write sock entry. */
struct hdhomerun_discover_sock_t *dss = &ds->socks[ds->sock_count++];
dss->sock = sock;
dss->detected = TRUE;
dss->local_ip = local_ip;
dss->subnet_mask = subnet_mask;
return TRUE;
}
struct hdhomerun_discover_t *hdhomerun_discover_create(struct hdhomerun_debug_t *dbg)
{
struct hdhomerun_discover_t *ds = (struct hdhomerun_discover_t *)calloc(1, sizeof(struct hdhomerun_discover_t));
if (!ds) {
return NULL;
}
ds->dbg = dbg;
/* Create a routable socket (always first entry). */
if (!hdhomerun_discover_sock_add(ds, 0, 0)) {
free(ds);
return NULL;
}
/* Success. */
return ds;
}
void hdhomerun_discover_destroy(struct hdhomerun_discover_t *ds)
{
unsigned int i;
for (i = 0; i < ds->sock_count; i++) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[i];
hdhomerun_sock_destroy(dss->sock);
}
free(ds);
}
static void hdhomerun_discover_sock_detect(struct hdhomerun_discover_t *ds)
{
unsigned int i;
for (i = 1; i < ds->sock_count; i++) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[i];
dss->detected = FALSE;
}
struct hdhomerun_local_ip_info_t ip_info_list[HDHOMERUN_DISOCVER_MAX_SOCK_COUNT];
int count = hdhomerun_local_ip_info(ip_info_list, HDHOMERUN_DISOCVER_MAX_SOCK_COUNT);
if (count < 0) {
hdhomerun_debug_printf(ds->dbg, "discover: hdhomerun_local_ip_info returned error\n");
count = 0;
}
if (count > HDHOMERUN_DISOCVER_MAX_SOCK_COUNT) {
hdhomerun_debug_printf(ds->dbg, "discover: too many local IP addresses\n");
count = HDHOMERUN_DISOCVER_MAX_SOCK_COUNT;
}
int index;
for (index = 0; index < count; index++) {
struct hdhomerun_local_ip_info_t *ip_info = &ip_info_list[index];
hdhomerun_discover_sock_add(ds, ip_info->ip_addr, ip_info->subnet_mask);
}
struct hdhomerun_discover_sock_t *src = &ds->socks[1];
struct hdhomerun_discover_sock_t *dst = &ds->socks[1];
count = 1;
for (i = 1; i < ds->sock_count; i++) {
if (!src->detected) {
hdhomerun_sock_destroy(src->sock);
src++;
continue;
}
if (dst != src) {
*dst = *src;
}
src++;
dst++;
count++;
}
ds->sock_count = count;
}
static bool_t hdhomerun_discover_send_internal(struct hdhomerun_discover_t *ds, struct hdhomerun_discover_sock_t *dss, uint32_t target_ip, uint32_t device_type, uint32_t device_id)
{
struct hdhomerun_pkt_t *tx_pkt = &ds->tx_pkt;
hdhomerun_pkt_reset(tx_pkt);
hdhomerun_pkt_write_u8(tx_pkt, HDHOMERUN_TAG_DEVICE_TYPE);
hdhomerun_pkt_write_var_length(tx_pkt, 4);
hdhomerun_pkt_write_u32(tx_pkt, device_type);
hdhomerun_pkt_write_u8(tx_pkt, HDHOMERUN_TAG_DEVICE_ID);
hdhomerun_pkt_write_var_length(tx_pkt, 4);
hdhomerun_pkt_write_u32(tx_pkt, device_id);
hdhomerun_pkt_seal_frame(tx_pkt, HDHOMERUN_TYPE_DISCOVER_REQ);
return hdhomerun_sock_sendto(dss->sock, target_ip, HDHOMERUN_DISCOVER_UDP_PORT, tx_pkt->start, tx_pkt->end - tx_pkt->start, 0);
}
static bool_t hdhomerun_discover_send_wildcard_ip(struct hdhomerun_discover_t *ds, uint32_t device_type, uint32_t device_id)
{
bool_t result = FALSE;
/*
* Send subnet broadcast using each local ip socket.
* This will work with multiple separate 169.254.x.x interfaces.
*/
unsigned int i;
for (i = 1; i < ds->sock_count; i++) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[i];
uint32_t target_ip = dss->local_ip | ~dss->subnet_mask;
result |= hdhomerun_discover_send_internal(ds, dss, target_ip, device_type, device_id);
}
/*
* If no local ip sockets then fall back to sending a global broadcast letting the OS choose the interface.
*/
if (!result) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[0];
result = hdhomerun_discover_send_internal(ds, dss, 0xFFFFFFFF, device_type, device_id);
}
return result;
}
static bool_t hdhomerun_discover_send_target_ip(struct hdhomerun_discover_t *ds, uint32_t target_ip, uint32_t device_type, uint32_t device_id)
{
bool_t result = FALSE;
/*
* Send targeted packet from any local ip that is in the same subnet.
* This will work with multiple separate 169.254.x.x interfaces.
*/
unsigned int i;
for (i = 1; i < ds->sock_count; i++) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[i];
if ((target_ip & dss->subnet_mask) != (dss->local_ip & dss->subnet_mask)) {
continue;
}
result |= hdhomerun_discover_send_internal(ds, dss, target_ip, device_type, device_id);
}
/*
* If target IP does not match a local subnet then fall back to letting the OS choose the gateway interface.
*/
if (!result) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[0];
result = hdhomerun_discover_send_internal(ds, dss, target_ip, device_type, device_id);
}
return result;
}
static bool_t hdhomerun_discover_send(struct hdhomerun_discover_t *ds, uint32_t target_ip, uint32_t device_type, uint32_t device_id)
{
if (target_ip == 0) {
return hdhomerun_discover_send_wildcard_ip(ds, device_type, device_id);
} else {
return hdhomerun_discover_send_target_ip(ds, target_ip, device_type, device_id);
}
}
static bool_t hdhomerun_discover_recv_internal(struct hdhomerun_discover_t *ds, struct hdhomerun_discover_sock_t *dss, struct hdhomerun_discover_device_t *result)
{
struct hdhomerun_pkt_t *rx_pkt = &ds->rx_pkt;
hdhomerun_pkt_reset(rx_pkt);
uint32_t remote_addr;
uint16_t remote_port;
size_t length = rx_pkt->limit - rx_pkt->end;
if (!hdhomerun_sock_recvfrom(dss->sock, &remote_addr, &remote_port, rx_pkt->end, &length, 0)) {
return FALSE;
}
rx_pkt->end += length;
uint16_t type;
if (hdhomerun_pkt_open_frame(rx_pkt, &type) <= 0) {
return FALSE;
}
if (type != HDHOMERUN_TYPE_DISCOVER_RPY) {
return FALSE;
}
result->ip_addr = remote_addr;
result->device_type = 0;
result->device_id = 0;
result->tuner_count = 0;
while (1) {
uint8_t tag;
size_t len;
uint8_t *next = hdhomerun_pkt_read_tlv(rx_pkt, &tag, &len);
if (!next) {
break;
}
switch (tag) {
case HDHOMERUN_TAG_DEVICE_TYPE:
if (len != 4) {
break;
}
result->device_type = hdhomerun_pkt_read_u32(rx_pkt);
break;
case HDHOMERUN_TAG_DEVICE_ID:
if (len != 4) {
break;
}
result->device_id = hdhomerun_pkt_read_u32(rx_pkt);
break;
case HDHOMERUN_TAG_TUNER_COUNT:
if (len != 1) {
break;
}
result->tuner_count = hdhomerun_pkt_read_u8(rx_pkt);
break;
default:
break;
}
rx_pkt->pos = next;
}
/* Fixup for old firmware. */
if (result->tuner_count == 0) {
switch (result->device_id >> 20) {
case 0x102:
result->tuner_count = 1;
break;
case 0x100:
case 0x101:
case 0x121:
result->tuner_count = 2;
break;
default:
break;
}
}
return TRUE;
}
static bool_t hdhomerun_discover_recv(struct hdhomerun_discover_t *ds, struct hdhomerun_discover_device_t *result)
{
unsigned int i;
for (i = 0; i < ds->sock_count; i++) {
struct hdhomerun_discover_sock_t *dss = &ds->socks[i];
if (hdhomerun_discover_recv_internal(ds, dss, result)) {
return TRUE;
}
}
return FALSE;
}
static struct hdhomerun_discover_device_t *hdhomerun_discover_find_in_list(struct hdhomerun_discover_device_t result_list[], int count, struct hdhomerun_discover_device_t *lookup)
{
int index;
for (index = 0; index < count; index++) {
struct hdhomerun_discover_device_t *entry = &result_list[index];
if (memcmp(lookup, entry, sizeof(struct hdhomerun_discover_device_t)) == 0) {
return entry;
}
}
return NULL;
}
int hdhomerun_discover_find_devices(struct hdhomerun_discover_t *ds, uint32_t target_ip, uint32_t device_type, uint32_t device_id, struct hdhomerun_discover_device_t result_list[], int max_count)
{
hdhomerun_discover_sock_detect(ds);
int count = 0;
int attempt;
for (attempt = 0; attempt < 2; attempt++) {
if (!hdhomerun_discover_send(ds, target_ip, device_type, device_id)) {
return -1;
}
uint64_t timeout = getcurrenttime() + 200;
while (1) {
struct hdhomerun_discover_device_t *result = &result_list[count];
memset(result, 0, sizeof(struct hdhomerun_discover_device_t));
if (!hdhomerun_discover_recv(ds, result)) {
if (getcurrenttime() >= timeout) {
break;
}
msleep_approx(10);
continue;
}
/* Filter. */
if (device_type != HDHOMERUN_DEVICE_TYPE_WILDCARD) {
if (device_type != result->device_type) {
continue;
}
}
if (device_id != HDHOMERUN_DEVICE_ID_WILDCARD) {
if (device_id != result->device_id) {
continue;
}
}
/* Ensure not already in list. */
if (hdhomerun_discover_find_in_list(result_list, count, result)) {
continue;
}
/* Add to list. */
count++;
if (count >= max_count) {
return count;
}
}
}
return count;
}
int hdhomerun_discover_find_devices_custom(uint32_t target_ip, uint32_t device_type, uint32_t device_id, struct hdhomerun_discover_device_t result_list[], int max_count)
{
if (hdhomerun_discover_is_ip_multicast(target_ip)) {
return 0;
}
struct hdhomerun_discover_t *ds = hdhomerun_discover_create(NULL);
if (!ds) {
return -1;
}
int ret = hdhomerun_discover_find_devices(ds, target_ip, device_type, device_id, result_list, max_count);
hdhomerun_discover_destroy(ds);
return ret;
}
bool_t hdhomerun_discover_validate_device_id(uint32_t device_id)
{
static uint32_t lookup_table[16] = {0xA, 0x5, 0xF, 0x6, 0x7, 0xC, 0x1, 0xB, 0x9, 0x2, 0x8, 0xD, 0x4, 0x3, 0xE, 0x0};
uint32_t checksum = 0;
checksum ^= lookup_table[(device_id >> 28) & 0x0F];
checksum ^= (device_id >> 24) & 0x0F;
checksum ^= lookup_table[(device_id >> 20) & 0x0F];
checksum ^= (device_id >> 16) & 0x0F;
checksum ^= lookup_table[(device_id >> 12) & 0x0F];
checksum ^= (device_id >> 8) & 0x0F;
checksum ^= lookup_table[(device_id >> 4) & 0x0F];
checksum ^= (device_id >> 0) & 0x0F;
return (checksum == 0);
}
bool_t hdhomerun_discover_is_ip_multicast(uint32_t ip_addr)
{
return (ip_addr >= 0xE0000000) && (ip_addr < 0xF0000000);
}
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