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|
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#ifndef _WIN32
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#endif
#include "libmmbackend.h"
#include "sacn.h"
//upper limit imposed by using the fd index as 16-bit part of the instance id
#define MAX_FDS 4096
#define BACKEND_NAME "sacn"
static struct /*_sacn_global_config*/ {
uint8_t source_name[64];
uint8_t cid[16];
size_t fds;
sacn_fd* fd;
uint64_t last_announce;
} global_cfg = {
.source_name = "MIDIMonster",
.cid = {'M', 'I', 'D', 'I', 'M', 'o', 'n', 's', 't', 'e', 'r'},
.fds = 0,
.fd = NULL,
.last_announce = 0
};
int init(){
backend sacn = {
.name = BACKEND_NAME,
.conf = sacn_configure,
.create = sacn_instance,
.conf_instance = sacn_configure_instance,
.channel = sacn_channel,
.handle = sacn_set,
.process = sacn_handle,
.start = sacn_start,
.shutdown = sacn_shutdown
};
//register the backend
if(mm_backend_register(sacn)){
fprintf(stderr, "Failed to register sACN backend\n");
return 1;
}
return 0;
}
static int sacn_listener(char* host, char* port, uint8_t fd_flags){
int fd = -1;
if(global_cfg.fds >= MAX_FDS){
fprintf(stderr, "sACN backend descriptor limit reached\n");
return -1;
}
fd = mmbackend_socket(host, port, SOCK_DGRAM, 1);
if(fd < 0){
return -1;
}
//store fd
global_cfg.fd = realloc(global_cfg.fd, (global_cfg.fds + 1) * sizeof(sacn_fd));
if(!global_cfg.fd){
close(fd);
fprintf(stderr, "Failed to allocate memory\n");
return -1;
}
fprintf(stderr, "sACN backend interface %lu bound to %s port %s\n", global_cfg.fds, host, port);
global_cfg.fd[global_cfg.fds].fd = fd;
global_cfg.fd[global_cfg.fds].flags = fd_flags;
global_cfg.fd[global_cfg.fds].universes = 0;
global_cfg.fd[global_cfg.fds].universe = NULL;
global_cfg.fd[global_cfg.fds].last_frame = NULL;
global_cfg.fds++;
return 0;
}
static int sacn_configure(char* option, char* value){
char* host = NULL, *port = NULL, *next = NULL;
uint8_t flags = 0;
size_t u;
if(!strcmp(option, "name")){
if(strlen(value) > 63){
fprintf(stderr, "Invalid sACN source name %s, limit is 63 characters\n", value);
return 1;
}
memset(global_cfg.source_name, 0, sizeof(global_cfg.source_name));
memcpy(global_cfg.source_name, value, strlen(value));
return 0;
}
else if(!strcmp(option, "cid")){
next = value;
for(u = 0; u < sizeof(global_cfg.cid); u++){
global_cfg.cid[u] = (strtoul(next, &next, 0) & 0xFF);
}
}
else if(!strcmp(option, "bind")){
mmbackend_parse_hostspec(value, &host, &port);
if(!port){
port = SACN_PORT;
}
if(!host){
fprintf(stderr, "No valid sACN bind address provided\n");
return 1;
}
if(sacn_listener(host, port, flags)){
fprintf(stderr, "Failed to bind sACN descriptor: %s\n", value);
return 1;
}
return 0;
}
fprintf(stderr, "Unknown sACN backend option %s\n", option);
return 1;
}
static int sacn_configure_instance(instance* inst, char* option, char* value){
sacn_instance_data* data = (sacn_instance_data*) inst->impl;
char* host = NULL, *port = NULL, *next = NULL;
size_t u;
if(!strcmp(option, "universe")){
data->uni = strtoul(value, NULL, 10);
return 0;
}
else if(!strcmp(option, "interface")){
data->fd_index = strtoul(value, NULL, 10);
if(data->fd_index >= global_cfg.fds){
fprintf(stderr, "Configured sACN interface index is out of range on instance %s\n", inst->name);
return 1;
}
return 0;
}
else if(!strcmp(option, "priority")){
data->xmit_prio = strtoul(value, NULL, 10);
return 0;
}
else if(!strcmp(option, "destination")){
mmbackend_parse_hostspec(value, &host, &port);
if(!port){
port = SACN_PORT;
}
if(!host){
fprintf(stderr, "No valid sACN destination for instance %s\n", inst->name);
return 1;
}
return mmbackend_parse_sockaddr(host, port, &data->dest_addr, &data->dest_len);
}
else if(!strcmp(option, "from")){
next = value;
data->filter_enabled = 1;
for(u = 0; u < sizeof(data->cid_filter); u++){
data->cid_filter[u] = (strtoul(next, &next, 0) & 0xFF);
}
fprintf(stderr, "Enabled source CID filter for instance %s\n", inst->name);
return 0;
}
else if(!strcmp(option, "unicast")){
data->unicast_input = strtoul(value, NULL, 10);
}
fprintf(stderr, "Unknown configuration option %s for sACN backend\n", option);
return 1;
}
static instance* sacn_instance(){
instance* inst = mm_instance();
if(!inst){
return NULL;
}
inst->impl = calloc(1, sizeof(sacn_instance_data));
if(!inst->impl){
fprintf(stderr, "Failed to allocate memory");
return NULL;
}
return inst;
}
static channel* sacn_channel(instance* inst, char* spec){
sacn_instance_data* data = (sacn_instance_data*) inst->impl;
char* spec_next = spec;
unsigned chan_a = strtoul(spec, &spec_next, 10), chan_b = 0;
//range check
if(!chan_a || chan_a > 512){
fprintf(stderr, "sACN channel out of range on instance %s: %s\n", inst->name, spec);
return NULL;
}
chan_a--;
//if wide channel, mark fine
if(*spec_next == '+'){
chan_b = strtoul(spec_next + 1, NULL, 10);
if(!chan_b || chan_b > 512){
fprintf(stderr, "Invalid wide-channel spec on instance %s: %s\n", inst->name, spec);
return NULL;
}
chan_b--;
//if already mapped, bail
if(IS_ACTIVE(data->data.map[chan_b]) && data->data.map[chan_b] != (MAP_FINE | chan_a)){
fprintf(stderr, "Fine channel %u already mapped on instance %s\n", chan_b, inst->name);
return NULL;
}
data->data.map[chan_b] = MAP_FINE | chan_a;
}
//if already active, assert that nothing changes
if(IS_ACTIVE(data->data.map[chan_a])){
if((*spec_next == '+' && data->data.map[chan_a] != (MAP_COARSE | chan_b))
|| (*spec_next != '+' && data->data.map[chan_a] != (MAP_SINGLE | chan_a))){
fprintf(stderr, "Primary sACN channel %u already mapped in another mode on instance %s\n", chan_a, inst->name);
return NULL;
}
}
data->data.map[chan_a] = (*spec_next == '+') ? (MAP_COARSE | chan_b) : (MAP_SINGLE | chan_a);
return mm_channel(inst, chan_a, 1);
}
static int sacn_transmit(instance* inst){
size_t u;
sacn_instance_data* data = (sacn_instance_data*) inst->impl;
sacn_data_pdu pdu = {
.root = {
.preamble_size = htobe16(0x10),
.postamble_size = 0,
.magic = { 0 }, //memcpy'd
.flags = htobe16(0x7000 | 0x026e),
.vector = htobe32(ROOT_E131_DATA),
.sender_cid = { 0 }, //memcpy'd
.frame_flags = htobe16(0x7000 | 0x0258),
.frame_vector = htobe32(FRAME_E131_DATA)
},
.data = {
.source_name = "", //memcpy'd
.priority = data->xmit_prio,
.sync_addr = 0,
.sequence = data->data.last_seq++,
.options = 0,
.universe = htobe16(data->uni),
.flags = htobe16(0x7000 | 0x0205),
.vector = DMP_SET_PROPERTY,
.format = 0xA1,
.startcode_offset = 0,
.address_increment = htobe16(1),
.channels = htobe16(513),
.data = { 0 } //memcpy'd
}
};
memcpy(pdu.root.magic, SACN_PDU_MAGIC, sizeof(pdu.root.magic));
memcpy(pdu.root.sender_cid, global_cfg.cid, sizeof(pdu.root.sender_cid));
memcpy(pdu.data.source_name, global_cfg.source_name, sizeof(pdu.data.source_name));
memcpy((((uint8_t*)pdu.data.data) + 1), data->data.out, 512);
if(sendto(global_cfg.fd[data->fd_index].fd, (uint8_t*) &pdu, sizeof(pdu), 0, (struct sockaddr*) &data->dest_addr, data->dest_len) < 0){
fprintf(stderr, "Failed to output sACN frame for instance %s: %s\n", inst->name, strerror(errno));
}
//update last transmit timestamp
for(u = 0; u < global_cfg.fd[data->fd_index].universes; u++){
if(global_cfg.fd[data->fd_index].universe[u] == data->uni){
global_cfg.fd[data->fd_index].last_frame[u] = mm_timestamp();
}
}
return 0;
}
static int sacn_set(instance* inst, size_t num, channel** c, channel_value* v){
size_t u, mark = 0;
sacn_instance_data* data = (sacn_instance_data*) inst->impl;
if(!num){
return 0;
}
if(!data->xmit_prio){
fprintf(stderr, "sACN instance %s not enabled for output (%lu channel events)\n", inst->name, num);
return 0;
}
for(u = 0; u < num; u++){
if(IS_WIDE(data->data.map[c[u]->ident])){
uint32_t val = v[u].normalised * ((double) 0xFFFF);
if(data->data.out[c[u]->ident] != ((val >> 8) & 0xFF)){
mark = 1;
data->data.out[c[u]->ident] = (val >> 8) & 0xFF;
}
if(data->data.out[MAPPED_CHANNEL(data->data.map[c[u]->ident])] != (val & 0xFF)){
mark = 1;
data->data.out[MAPPED_CHANNEL(data->data.map[c[u]->ident])] = val & 0xFF;
}
}
else if(data->data.out[c[u]->ident] != (v[u].normalised * 255.0)){
mark = 1;
data->data.out[c[u]->ident] = v[u].normalised * 255.0;
}
}
//send packet if required
if(mark){
sacn_transmit(inst);
}
return 0;
}
static int sacn_process_frame(instance* inst, sacn_frame_root* frame, sacn_frame_data* data){
size_t u, max_mark = 0;
channel* chan = NULL;
channel_value val;
sacn_instance_data* inst_data = (sacn_instance_data*) inst->impl;
//source filtering
if(inst_data->filter_enabled && memcmp(inst_data->cid_filter, frame->sender_cid, 16)){
return 0;
}
if(data->format != 0xa1
|| data->startcode_offset
|| be16toh(data->address_increment) != 1){
fprintf(stderr, "sACN framing not supported\n");
return 1;
}
if(be16toh(data->channels) > 513){
fprintf(stderr, "Invalid sACN frame channel count\n");
return 1;
}
//handle source priority (currently a 1-bit counter)
if(inst_data->data.last_priority > data->priority){
inst_data->data.last_priority = data->priority;
return 0;
}
inst_data->data.last_priority = data->priority;
//read data (except start code), mark changed channels
for(u = 1; u < be16toh(data->channels); u++){
if(IS_ACTIVE(inst_data->data.map[u - 1])
&& data->data[u] != inst_data->data.in[u - 1]){
inst_data->data.in[u - 1] = data->data[u];
inst_data->data.map[u - 1] |= MAP_MARK;
max_mark = u - 1;
}
}
//generate events
for(u = 0; u <= max_mark; u++){
if(inst_data->data.map[u] & MAP_MARK){
//unmark and get channel
inst_data->data.map[u] &= ~MAP_MARK;
if(inst_data->data.map[u] & MAP_FINE){
chan = mm_channel(inst, MAPPED_CHANNEL(inst_data->data.map[u]), 0);
}
else{
chan = mm_channel(inst, u, 0);
}
if(!chan){
fprintf(stderr, "Active channel %lu on %s not known to core", u, inst->name);
return 1;
}
//generate value
if(IS_WIDE(inst_data->data.map[u])){
inst_data->data.map[MAPPED_CHANNEL(inst_data->data.map[u])] &= ~MAP_MARK;
val.raw.u64 = (uint16_t) (inst_data->data.in[u] << ((inst_data->data.map[u] & MAP_COARSE) ? 8 : 0));
val.raw.u64 |= (uint16_t) (inst_data->data.in[MAPPED_CHANNEL(inst_data->data.map[u])] << ((inst_data->data.map[u] & MAP_COARSE) ? 0 : 8));
val.normalised = (double) val.raw.u64 / (double) 0xFFFF;
}
else{
val.raw.u64 = inst_data->data.in[u];
val.normalised = (double) val.raw.u64 / 255.0;
}
if(mm_channel_event(chan, val)){
fprintf(stderr, "Failed to push sACN channel event to core\n");
return 1;
}
}
}
return 0;
}
static void sacn_discovery(size_t fd){
size_t page = 0, pages = (global_cfg.fd[fd].universes / 512) + 1, universes;
struct sockaddr_in discovery_dest = {
.sin_family = AF_INET,
.sin_port = htobe16(strtoul(SACN_PORT, NULL, 10)),
.sin_addr.s_addr = htobe32(((uint32_t) 0xefff0000) | 64214)
};
sacn_discovery_pdu pdu = {
.root = {
.preamble_size = htobe16(0x10),
.postamble_size = 0,
.magic = { 0 }, //memcpy'd
.flags = 0, //filled later
.vector = htobe32(ROOT_E131_EXTENDED),
.sender_cid = { 0 }, //memcpy'd
.frame_flags = 0, //filled later
.frame_vector = htobe32(FRAME_E131_DISCOVERY)
},
.data = {
.source_name = "", //memcpy'd
.flags = 0, //filled later
.vector = htobe32(DISCOVERY_UNIVERSE_LIST),
.page = 0, //filled later
.max_page = pages - 1,
.data = { 0 } //memcpy'd
}
};
memcpy(pdu.root.magic, SACN_PDU_MAGIC, sizeof(pdu.root.magic));
memcpy(pdu.root.sender_cid, global_cfg.cid, sizeof(pdu.root.sender_cid));
memcpy(pdu.data.source_name, global_cfg.source_name, sizeof(pdu.data.source_name));
for(; page < pages; page++){
universes = (global_cfg.fd[fd].universes - page * 512 >= 512) ? 512 : (global_cfg.fd[fd].universes % 512);
pdu.root.flags = htobe16(0x7000 | (104 + universes * sizeof(uint16_t)));
pdu.root.frame_flags = htobe16(0x7000 | (82 + universes * sizeof(uint16_t)));
pdu.data.flags = htobe16(0x7000 | (8 + universes * sizeof(uint16_t)));
pdu.data.page = page;
memcpy(pdu.data.data, global_cfg.fd[fd].universe + page * 512, universes * sizeof(uint16_t));
if(sendto(global_cfg.fd[fd].fd, (uint8_t*) &pdu, sizeof(pdu) - (512 - universes) * sizeof(uint16_t), 0, (struct sockaddr*) &discovery_dest, sizeof(discovery_dest)) < 0){
fprintf(stderr, "Failed to output sACN universe discovery frame for interface %lu: %s\n", fd, strerror(errno));
}
}
}
static int sacn_handle(size_t num, managed_fd* fds){
size_t u, c;
uint64_t timestamp = mm_timestamp();
ssize_t bytes_read;
char recv_buf[SACN_RECV_BUF];
instance* inst = NULL;
sacn_instance_id instance_id = {
.label = 0
};
sacn_frame_root* frame = (sacn_frame_root*) recv_buf;
sacn_frame_data* data = (sacn_frame_data*) (recv_buf + sizeof(sacn_frame_root));
if(mm_timestamp() - global_cfg.last_announce > SACN_DISCOVERY_TIMEOUT){
//send universe discovery pdu
for(u = 0; u < global_cfg.fds; u++){
if(global_cfg.fd[u].universes){
sacn_discovery(u);
}
}
global_cfg.last_announce = timestamp;
}
//check for keepalive frames
for(u = 0; u < global_cfg.fds; u++){
for(c = 0; c < global_cfg.fd[u].universes; c++){
if(timestamp - global_cfg.fd[u].last_frame[c] >= SACN_KEEPALIVE_INTERVAL){
instance_id.fields.fd_index = u;
instance_id.fields.uni = global_cfg.fd[u].universe[c];
inst = mm_instance_find(BACKEND_NAME, instance_id.label);
if(inst){
sacn_transmit(inst);
}
}
}
}
//early exit
if(!num){
return 0;
}
for(u = 0; u < num; u++){
do{
bytes_read = recv(fds[u].fd, recv_buf, sizeof(recv_buf), 0);
if(bytes_read > 0 && bytes_read > sizeof(sacn_frame_root)){
if(!memcmp(frame->magic, SACN_PDU_MAGIC, 12)
&& be16toh(frame->preamble_size) == 0x10
&& frame->postamble_size == 0
&& be32toh(frame->vector) == ROOT_E131_DATA
&& be32toh(frame->frame_vector) == FRAME_E131_DATA
&& data->vector == DMP_SET_PROPERTY){
instance_id.fields.fd_index = ((uint64_t) fds[u].impl) & 0xFFFF;
instance_id.fields.uni = be16toh(data->universe);
inst = mm_instance_find(BACKEND_NAME, instance_id.label);
if(inst && sacn_process_frame(inst, frame, data)){
fprintf(stderr, "Failed to process sACN frame\n");
}
}
}
} while(bytes_read > 0);
#ifdef _WIN32
if(bytes_read < 0 && WSAGetLastError() != WSAEWOULDBLOCK){
#else
if(bytes_read < 0 && errno != EAGAIN){
#endif
fprintf(stderr, "sACN failed to receive data: %s\n", strerror(errno));
}
if(bytes_read == 0){
fprintf(stderr, "sACN listener closed\n");
return 1;
}
}
return 0;
}
static int sacn_start(){
size_t n, u, p;
int rv = 1;
instance** inst = NULL;
sacn_instance_data* data = NULL;
sacn_instance_id id = {
.label = 0
};
struct ip_mreq mcast_req = {
.imr_interface = { INADDR_ANY }
};
struct sockaddr_in* dest_v4 = NULL;
//fetch all instances
if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
fprintf(stderr, "Failed to fetch instance list\n");
return 1;
}
if(!n){
free(inst);
return 0;
}
if(!global_cfg.fds){
fprintf(stderr, "Failed to start sACN backend: no descriptors bound\n");
free(inst);
return 1;
}
//update instance identifiers, join multicast groups
for(u = 0; u < n; u++){
data = (sacn_instance_data*) inst[u]->impl;
id.fields.fd_index = data->fd_index;
id.fields.uni = data->uni;
inst[u]->ident = id.label;
if(!data->uni){
fprintf(stderr, "Please specify a universe on instance %s\n", inst[u]->name);
goto bail;
}
//find duplicates
for(p = 0; p < u; p++){
if(inst[u]->ident == inst[p]->ident){
fprintf(stderr, "Colliding sACN instances, use one: %s - %s\n", inst[u]->name, inst[p]->name);
goto bail;
}
}
if(!data->unicast_input){
mcast_req.imr_multiaddr.s_addr = htobe32(((uint32_t) 0xefff0000) | ((uint32_t) data->uni));
if(setsockopt(global_cfg.fd[data->fd_index].fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (uint8_t*) &mcast_req, sizeof(mcast_req))){
fprintf(stderr, "Failed to join Multicast group for sACN universe %u on instance %s: %s\n", data->uni, inst[u]->name, strerror(errno));
}
}
if(data->xmit_prio){
//add to list of advertised universes for this fd
global_cfg.fd[data->fd_index].universe = realloc(global_cfg.fd[data->fd_index].universe, (global_cfg.fd[data->fd_index].universes + 1) * sizeof(uint16_t));
if(!global_cfg.fd[data->fd_index].universe){
fprintf(stderr, "Failed to allocate memory\n");
goto bail;
}
global_cfg.fd[data->fd_index].universe[global_cfg.fd[data->fd_index].universes] = data->uni;
global_cfg.fd[data->fd_index].universes++;
//generate multicast destination address if none set
if(!data->dest_len){
data->dest_len = sizeof(struct sockaddr_in);
dest_v4 = (struct sockaddr_in*) (&data->dest_addr);
dest_v4->sin_family = AF_INET;
dest_v4->sin_port = htobe16(strtoul(SACN_PORT, NULL, 10));
dest_v4->sin_addr = mcast_req.imr_multiaddr;
}
}
}
fprintf(stderr, "sACN backend registering %lu descriptors to core\n", global_cfg.fds);
for(u = 0; u < global_cfg.fds; u++){
//allocate memory for storing last frame transmission timestamp
global_cfg.fd[u].last_frame = calloc(global_cfg.fd[u].universes, sizeof(uint64_t));
if(!global_cfg.fd[u].last_frame){
fprintf(stderr, "Failed to allocate memory\n");
goto bail;
}
if(mm_manage_fd(global_cfg.fd[u].fd, BACKEND_NAME, 1, (void*) u)){
goto bail;
}
}
rv = 0;
bail:
free(inst);
return rv;
}
static int sacn_shutdown(){
size_t n, p;
instance** inst = NULL;
if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
fprintf(stderr, "Failed to fetch instance list\n");
return 1;
}
for(p = 0; p < n; p++){
free(inst[p]->impl);
}
free(inst);
for(p = 0; p < global_cfg.fds; p++){
close(global_cfg.fd[p].fd);
free(global_cfg.fd[p].universe);
free(global_cfg.fd[p].last_frame);
}
free(global_cfg.fd);
fprintf(stderr, "sACN backend shut down\n");
return 0;
}
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