Move backend implementations to subdirectory

1 files changed, 562 insertions, 0 deletions

diff --git a/backends/artnet.c b/backends/artnet.c
new file mode 100644
index 0000000..c16e630
--- /dev/null
+++ b/backends/artnet.c
@@ -0,0 +1,562 @@
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include "artnet.h"
+#define MAX_FDS 255
+#define BACKEND_NAME "artnet"
+
+static uint8_t default_net = 0;
+static size_t artnet_fds = 0;
+static artnet_descriptor* artnet_fd = NULL;
+
+static int artnet_listener(char* host, char* port){
+	int fd = -1, status, yes = 1, flags;
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_DGRAM,
+		.ai_flags = AI_PASSIVE
+	};
+	struct addrinfo* info;
+	struct addrinfo* addr_it;
+
+	if(artnet_fds >= MAX_FDS){
+		fprintf(stderr, "ArtNet backend descriptor limit reached\n");
+		return -1;
+	}
+
+	status = getaddrinfo(host, port, &hints, &info);
+	if(status){
+		fprintf(stderr, "Failed to get socket info for %s port %s: %s\n", host, port, gai_strerror(status));
+		return -1;
+	}
+
+	for(addr_it = info; addr_it != NULL; addr_it = addr_it->ai_next){
+		fd = socket(addr_it->ai_family, addr_it->ai_socktype, addr_it->ai_protocol);
+		if(fd < 0){
+			continue;
+		}
+
+		yes = 1;
+		if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0){
+			fprintf(stderr, "Failed to set SO_REUSEADDR on socket\n");
+		}
+
+		yes = 1;
+		if(setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (void*)&yes, sizeof(yes)) < 0){
+			fprintf(stderr, "Failed to set SO_BROADCAST on socket\n");
+		}
+
+		yes = 0;
+		if(setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void*)&yes, sizeof(yes)) < 0){
+			fprintf(stderr, "Failed to unset IP_MULTICAST_LOOP option: %s\n", strerror(errno));
+		}
+
+		status = bind(fd, addr_it->ai_addr, addr_it->ai_addrlen);
+		if(status < 0){
+			close(fd);
+			continue;
+		}
+
+		break;
+	}
+
+	freeaddrinfo(info);
+
+	if(!addr_it){
+		fprintf(stderr, "Failed to create listening socket for %s port %s\n", host, port);
+		return -1;
+	}
+
+	//set nonblocking
+	flags = fcntl(fd, F_GETFL, 0);
+	if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0){
+		fprintf(stderr, "Failed to set ArtNet descriptor nonblocking\n");
+		return -1;
+	}
+
+	//store fd
+	artnet_fd = realloc(artnet_fd, (artnet_fds + 1) * sizeof(artnet_descriptor));
+	if(!artnet_fd){
+		fprintf(stderr, "Failed to allocate memory\n");
+		return -1;
+	}
+
+	fprintf(stderr, "ArtNet backend interface %zu bound to %s port %s\n", artnet_fds, host, port);
+	artnet_fd[artnet_fds].fd = fd;
+	artnet_fd[artnet_fds].output_instances = 0;
+	artnet_fd[artnet_fds].output_instance = NULL;
+	artnet_fd[artnet_fds].last_frame = NULL;
+	artnet_fds++;
+	return 0;
+}
+
+static int artnet_parse_addr(char* host, char* port, struct sockaddr_storage* addr, socklen_t* len){
+	struct addrinfo* head;
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_DGRAM
+	};
+
+	int error = getaddrinfo(host, port, &hints, &head);
+	if(error || !head){
+		fprintf(stderr, "Failed to parse address %s port %s: %s\n", host, port, gai_strerror(error));
+		return 1;
+	}
+
+	memcpy(addr, head->ai_addr, head->ai_addrlen);
+	*len = head->ai_addrlen;
+
+	freeaddrinfo(head);
+	return 0;
+}
+
+static int artnet_separate_hostspec(char* in, char** host, char** port){
+	size_t u;
+
+	if(!in || !host || !port){
+		return 1;
+	}
+
+	for(u = 0; in[u] && !isspace(in[u]); u++){
+	}
+
+	//guess
+	*host = in;
+
+	if(in[u]){
+		in[u] = 0;
+		*port = in + u + 1;
+	}
+	else{
+		//no port given
+		*port = ARTNET_PORT;
+	}
+	return 0;
+}
+
+int init(){
+	backend artnet = {
+		.name = BACKEND_NAME,
+		.conf = artnet_configure,
+		.create = artnet_instance,
+		.conf_instance = artnet_configure_instance,
+		.channel = artnet_channel,
+		.handle = artnet_set,
+		.process = artnet_handle,
+		.start = artnet_start,
+		.shutdown = artnet_shutdown
+	};
+
+	//register backend
+	if(mm_backend_register(artnet)){
+		fprintf(stderr, "Failed to register ArtNet backend\n");
+		return 1;
+	}
+	return 0;
+}
+
+static int artnet_configure(char* option, char* value){
+	char* host = NULL, *port = NULL;
+	if(!strcmp(option, "net")){
+		//configure default net
+		default_net = strtoul(value, NULL, 0);
+		return 0;
+	}
+	else if(!strcmp(option, "bind")){
+		if(artnet_separate_hostspec(value, &host, &port)){
+			fprintf(stderr, "Not a valid ArtNet bind address: %s\n", value);
+			return 1;
+		}
+
+		if(artnet_listener(host, port)){
+			fprintf(stderr, "Failed to bind ArtNet descriptor: %s\n", value);
+			return 1;
+		}
+		return 0;
+	}
+
+	fprintf(stderr, "Unknown ArtNet backend option %s\n", option);
+	return 1;
+}
+
+static instance* artnet_instance(){
+	artnet_instance_data* data = NULL;
+	instance* inst = mm_instance();
+	if(!inst){
+		return NULL;
+	}
+
+	data = calloc(1, sizeof(artnet_instance_data));
+	if(!data){
+		fprintf(stderr, "Failed to allocate memory\n");
+		return NULL;
+	}
+
+	data->net = default_net;
+
+	inst->impl = data;
+	return inst;
+}
+
+static int artnet_configure_instance(instance* inst, char* option, char* value){
+	char* host = NULL, *port = NULL;
+	artnet_instance_data* data = (artnet_instance_data*) inst->impl;
+
+	if(!strcmp(option, "net")){
+		data->net = strtoul(value, NULL, 0);
+		return 0;
+	}
+	else if(!strcmp(option, "uni") || !strcmp(option, "universe")){
+		data->uni = strtoul(value, NULL, 0);
+		return 0;
+	}
+	else if(!strcmp(option, "iface") || !strcmp(option, "interface")){
+		data->fd_index = strtoul(value, NULL, 0);
+
+		if(data->fd_index >= artnet_fds){
+			fprintf(stderr, "Invalid interface configured for ArtNet instance %s\n", inst->name);
+			return 1;
+		}
+		return 0;
+	}
+	else if(!strcmp(option, "dest") || !strcmp(option, "destination")){
+		if(artnet_separate_hostspec(value, &host, &port)){
+			fprintf(stderr, "Not a valid ArtNet destination for instance %s\n", inst->name);
+			return 1;
+		}
+
+		return artnet_parse_addr(host, port, &data->dest_addr, &data->dest_len);
+	}
+
+	fprintf(stderr, "Unknown ArtNet option %s for instance %s\n", option, inst->name);
+	return 1;
+}
+
+static channel* artnet_channel(instance* inst, char* spec){
+	artnet_instance_data* data = (artnet_instance_data*) inst->impl;
+	char* spec_next = spec;
+	unsigned chan_a = strtoul(spec, &spec_next, 10);
+	unsigned chan_b = 0;
+
+	//primary channel sanity check
+	if(!chan_a || chan_a > 512){
+		fprintf(stderr, "Invalid ArtNet channel specification %s\n", spec);
+		return NULL;
+	}
+	chan_a--;
+
+	//secondary channel setup
+	if(*spec_next == '+'){
+		chan_b = strtoul(spec_next + 1, NULL, 10);
+		if(!chan_b || chan_b > 512){
+			fprintf(stderr, "Invalid wide-channel spec %s\n", spec);
+			return NULL;
+		}
+		chan_b--;
+
+		//if mapped mode differs, bail
+		if(IS_ACTIVE(data->data.map[chan_b]) && data->data.map[chan_b] != (MAP_FINE | chan_a)){
+			fprintf(stderr, "Fine channel already mapped for ArtNet spec %s\n", spec);
+			return NULL;
+		}
+
+		data->data.map[chan_b] = MAP_FINE | chan_a;
+	}
+
+	//check current map mode
+	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 ArtNet channel already mapped at differing mode: %s\n", spec);
+			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 artnet_transmit(instance* inst){
+	size_t u;
+	artnet_instance_data* data = (artnet_instance_data*) inst->impl;
+	//output frame
+	artnet_pkt frame = {
+		.magic = {'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
+		.opcode = htobe16(OpDmx),
+		.version = htobe16(ARTNET_VERSION),
+		.sequence = data->data.seq++,
+		.port = 0,
+		.universe = data->uni,
+		.net = data->net,
+		.length = htobe16(512),
+		.data = {0}
+	};
+	memcpy(frame.data, data->data.out, 512);
+
+	if(sendto(artnet_fd[data->fd_index].fd, &frame, sizeof(frame), 0, (struct sockaddr*) &data->dest_addr, data->dest_len) < 0){
+		fprintf(stderr, "Failed to output ArtNet frame for instance %s: %s\n", inst->name, strerror(errno));
+	}
+
+	//update last frame timestamp
+	for(u = 0; u < artnet_fd[data->fd_index].output_instances; u++){
+		if(artnet_fd[data->fd_index].output_instance[u].label == inst->ident){
+			artnet_fd[data->fd_index].last_frame[u] = mm_timestamp();
+		}
+	}
+	return 0;
+}
+
+static int artnet_set(instance* inst, size_t num, channel** c, channel_value* v){
+	size_t u, mark = 0;
+	artnet_instance_data* data = (artnet_instance_data*) inst->impl;
+
+	if(!data->dest_len){
+		fprintf(stderr, "ArtNet instance %s not enabled for output (%zu channel events)\n", inst->name, num);
+		return 0;
+	}
+
+	//FIXME maybe introduce minimum frame interval
+	for(u = 0; u < num; u++){
+		if(IS_WIDE(data->data.map[c[u]->ident])){
+			uint32_t val = v[u].normalised * ((double) 0xFFFF);
+			//the primary (coarse) channel is the one registered to the core, so we don't have to check for that
+			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;
+		}
+	}
+
+	if(mark){
+		return artnet_transmit(inst);
+	}
+
+	return 0;
+}
+
+static inline int artnet_process_frame(instance* inst, artnet_pkt* frame){
+	size_t p, max_mark = 0;
+	uint16_t wide_val = 0;
+	channel* chan = NULL;
+	channel_value val;
+	artnet_instance_data* data = (artnet_instance_data*) inst->impl;
+
+	if(be16toh(frame->length) > 512){
+		fprintf(stderr, "Invalid ArtNet frame channel count\n");
+		return 1;
+	}
+
+	//read data, mark update channels
+	for(p = 0; p < be16toh(frame->length); p++){
+		if(IS_ACTIVE(data->data.map[p]) && frame->data[p] != data->data.in[p]){
+			data->data.in[p] = frame->data[p];
+			data->data.map[p] |= MAP_MARK;
+			max_mark = p;
+		}
+	}
+
+	//generate events
+	for(p = 0; p <= max_mark; p++){
+		if(data->data.map[p] & MAP_MARK){
+			data->data.map[p] &= ~MAP_MARK;
+			if(data->data.map[p] & MAP_FINE){
+				chan = mm_channel(inst, MAPPED_CHANNEL(data->data.map[p]), 0);
+			}
+			else{
+				chan = mm_channel(inst, p, 0);
+			}
+
+			if(!chan){
+				fprintf(stderr, "Active channel %zu on %s not known to core\n", p, inst->name);
+				return 1;
+			}
+
+			if(IS_WIDE(data->data.map[p])){
+				data->data.map[MAPPED_CHANNEL(data->data.map[p])] &= ~MAP_MARK;
+				wide_val = data->data.in[p] << ((data->data.map[p] & MAP_COARSE) ? 8 : 0);
+				wide_val |= data->data.in[MAPPED_CHANNEL(data->data.map[p])] << ((data->data.map[p] & MAP_COARSE) ? 0 : 8);
+
+				val.raw.u64 = wide_val;
+				val.normalised = (double) wide_val / (double) 0xFFFF;
+			}
+			else{
+				//single channel
+				val.raw.u64 = data->data.in[p];
+				val.normalised = (double) data->data.in[p] / 255.0;
+			}
+
+			if(mm_channel_event(chan, val)){
+				fprintf(stderr, "Failed to push ArtNet channel event to core\n");
+				return 1;
+			}
+		}
+	}
+	return 0;
+}
+
+static int artnet_handle(size_t num, managed_fd* fds){
+	size_t u, c;
+	uint64_t timestamp = mm_timestamp();
+	ssize_t bytes_read;
+	char recv_buf[ARTNET_RECV_BUF];
+	artnet_instance_id inst_id = {
+		.label = 0
+	};
+	instance* inst = NULL;
+	artnet_pkt* frame = (artnet_pkt*) recv_buf;
+
+	//transmit keepalive frames
+	for(u = 0; u < artnet_fds; u++){
+		for(c = 0; c < artnet_fd[u].output_instances; c++){
+			if(timestamp - artnet_fd[u].last_frame[c] >= ARTNET_KEEPALIVE_INTERVAL){
+				inst = mm_instance_find(BACKEND_NAME, artnet_fd[u].output_instance[c].label);
+				if(inst){
+					artnet_transmit(inst);
+				}
+			}
+		}
+	}
+
+	if(!num){
+		//early exit
+		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(artnet_hdr)){
+				if(!memcmp(frame->magic, "Art-Net\0", 8) && be16toh(frame->opcode) == OpDmx){
+					//find matching instance
+					inst_id.fields.fd_index = ((uint64_t) fds[u].impl) & 0xFF;
+					inst_id.fields.net = frame->net;
+					inst_id.fields.uni = frame->universe;
+					inst = mm_instance_find(BACKEND_NAME, inst_id.label);
+					if(inst && artnet_process_frame(inst, frame)){
+						fprintf(stderr, "Failed to process ArtNet frame\n");
+					}
+				}
+			}
+		} while(bytes_read > 0);
+
+		if(bytes_read < 0 && errno != EAGAIN){
+			fprintf(stderr, "ArtNet failed to receive data: %s\n", strerror(errno));
+		}
+
+		if(bytes_read == 0){
+			fprintf(stderr, "ArtNet listener closed\n");
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int artnet_start(){
+	size_t n, u, p;
+	int rv = 1;
+	instance** inst = NULL;
+	artnet_instance_data* data = NULL;
+	artnet_instance_id id = {
+		.label = 0
+	};
+
+	//fetch all defined 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(!artnet_fds){
+		fprintf(stderr, "Failed to start ArtNet backend: no descriptors bound\n");
+		return 1;
+	}
+
+	for(u = 0; u < n; u++){
+		data = (artnet_instance_data*) inst[u]->impl;
+		//set instance identifier
+		id.fields.fd_index = data->fd_index;
+		id.fields.net = data->net;
+		id.fields.uni = data->uni;
+		inst[u]->ident = id.label;
+
+		//check for duplicates
+		for(p = 0; p < u; p++){
+			if(inst[u]->ident == inst[p]->ident){
+				fprintf(stderr, "Universe specified multiple times, use one instance: %s - %s\n", inst[u]->name, inst[p]->name);
+				goto bail;
+			}
+		}
+
+		//if enabled for output, add to keepalive tracking
+		if(data->dest_len){
+			artnet_fd[data->fd_index].output_instance = realloc(artnet_fd[data->fd_index].output_instance, (artnet_fd[data->fd_index].output_instances + 1) * sizeof(artnet_instance_id));
+			artnet_fd[data->fd_index].last_frame = realloc(artnet_fd[data->fd_index].last_frame, (artnet_fd[data->fd_index].output_instances + 1) * sizeof(uint64_t));
+
+			if(!artnet_fd[data->fd_index].output_instance || !artnet_fd[data->fd_index].last_frame){
+				fprintf(stderr, "Failed to allocate memory\n");
+				goto bail;
+			}
+			artnet_fd[data->fd_index].output_instance[artnet_fd[data->fd_index].output_instances] = id;
+			artnet_fd[data->fd_index].last_frame[artnet_fd[data->fd_index].output_instances] = 0;
+
+			artnet_fd[data->fd_index].output_instances++;
+		}
+	}
+
+	fprintf(stderr, "ArtNet backend registering %zu descriptors to core\n", artnet_fds);
+	for(u = 0; u < artnet_fds; u++){
+		if(mm_manage_fd(artnet_fd[u].fd, BACKEND_NAME, 1, (void*) u)){
+			goto bail;
+		}
+	}
+
+	rv = 0;
+bail:
+	free(inst);
+	return rv;
+}
+
+static int artnet_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 < artnet_fds; p++){
+		close(artnet_fd[p].fd);
+		free(artnet_fd[p].output_instance);
+		free(artnet_fd[p].last_frame);
+	}
+	free(artnet_fd);
+
+	fprintf(stderr, "ArtNet backend shut down\n");
+	return 0;
+}