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controller.c
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controller.c
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#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <ctype.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/param.h>
#include <netdb.h>
#include <fcntl.h>
#include <errno.h>
#include "controller.h"
static struct {
int artnet_fd;
int display_fd;
volatile sig_atomic_t shutdown;
enum {
cfg_none,
cfg_display,
cfg_artnet,
cfg_message
} parser_state;
/* Display config */
uint8_t lines;
uint8_t display;
uint8_t width;
/* ArtNet config */
uint8_t net;
uint8_t universe;
uint16_t address;
/* Messages */
message* message[256];
message* last_message;
} config = {
.artnet_fd = -1,
.display_fd = -1,
.shutdown = 0,
.parser_state = cfg_none
};
int network_fd(char* host, char* port, int socktype, uint8_t listener){
int fd = -1, status, yes = 1;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = socktype,
.ai_flags = (listener ? AI_PASSIVE : 0)
};
struct addrinfo *info, *addr_it;
status = getaddrinfo(host, port, &hints, &info);
if(status){
printf("Failed to parse address %s port %s: %s\n", host, port, gai_strerror(status));
return -1;
}
//traverse the result list
for(addr_it = info; addr_it; addr_it = addr_it->ai_next){
fd = socket(addr_it->ai_family, addr_it->ai_socktype, addr_it->ai_protocol);
if(fd < 0){
continue;
}
//set required socket options
yes = 1;
if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0){
printf("Failed to enable SO_REUSEADDR on socket: %s\n", strerror(errno));
}
if(listener){
status = bind(fd, addr_it->ai_addr, addr_it->ai_addrlen);
if(status < 0){
close(fd);
continue;
}
}
else{
status = connect(fd, addr_it->ai_addr, addr_it->ai_addrlen);
if(status < 0){
close(fd);
continue;
}
}
break;
}
freeaddrinfo(info);
if(!addr_it){
printf("Failed to create socket for %s port %s\n", host, port);
return -1;
}
//set nonblocking
status = fcntl(fd, F_GETFL, 0);
if(fcntl(fd, F_SETFL, status | O_NONBLOCK) < 0){
printf("Failed to set socket nonblocking: %s\n", strerror(errno));
close(fd);
return -1;
}
return fd;
}
uint8_t calc_checksum(uint8_t* data, size_t bytes){
uint8_t checksum = 0;
size_t u = 0;
for(u = 0; u < bytes; u++){
checksum ^= data[u];
}
return checksum;
}
int tx_message(message* msg, uint8_t tempo, uint8_t function){
size_t page;
tempo /= (255 / 8);
function >>= 4;
tx_header hdr = {
.lines = config.lines,
.destination = config.display,
.eoh = 0x03,
.flags = HFLAGS_DEFAULT | HFLAG_CONTINUE
};
tx_page_hdr page_hdr = {
.tempo = PFLAGS_TEMPO_DEFAULT | (tempo + 1),
.function = PFLAGS_FUNCTION_DEFAULT | function,
.flags = PFLAGS_DEFAULT
};
char termination[2] = {0x04, 0x04};
for(page = 0; page < msg->pages; page++){
if(!msg->text[page]){
break;
}
if(page == msg->pages - 1
|| !msg->text[page + 1]){
hdr.flags &= ~HFLAG_CONTINUE;
}
page_hdr.index[0] = '0' + (page + 1) / 100;
page_hdr.index[1] = '0' + ((page + 1) % 100) / 10;
page_hdr.index[2] = '0' + (page + 1) % 10;
termination[1] = 0x04;
termination[1] ^= calc_checksum((uint8_t*) &hdr, sizeof(hdr));
termination[1] ^= calc_checksum((uint8_t*) &page_hdr, sizeof(page_hdr));
termination[1] ^= calc_checksum((uint8_t*) msg->text[page], strlen(msg->text[page]));
printf("Transmitting page %zu of %zu, %zu bytes, Tempo %d (%d secs), Function %d\n", page + 1, msg->pages, msg->text[page] ? strlen(msg->text[page]) : 0, tempo, page_interval[tempo], function);
printf("Page index %c%c%c, Continue %s, Checksum %02X\n", page_hdr.index[0], page_hdr.index[1], page_hdr.index[2], hdr.flags & HFLAG_CONTINUE ? "yes" : "no", termination[1]);
printf("Contents: %s\n", msg->text[page] ? msg->text[page] : "NULL");
write(config.display_fd, &hdr, sizeof(hdr));
write(config.display_fd, &page_hdr, sizeof(page_hdr));
write(config.display_fd, msg->text[page], strlen(msg->text[page]));
write(config.display_fd, termination, 2);
}
return 0;
}
int artnet_process(){
char* recv_buffer[8192];
artnet_pkt* frame = (artnet_pkt*) recv_buffer;
ssize_t bytes_read = read(config.artnet_fd, recv_buffer, sizeof(recv_buffer));
if(bytes_read <= 0){
printf("Error receiving ArtNet: %s\n", strerror(errno));
return 1;
}
if(bytes_read > 20
&& !memcmp(frame->magic, "Art-Net\0", 8)
&& be16toh(frame->opcode) == ARTNET_OPCODE_DMX
&& frame->universe == config.universe
&& frame->net == config.net
&& be16toh(frame->length) >= config.address + ARTNET_CHANNELS){
if(!config.last_message){
printf("ArtNet input data, no message transmission yet\n");
}
if(config.message[frame->data[config.address]]
&& config.message[frame->data[config.address]] != config.last_message){
config.last_message = config.message[frame->data[config.address]];
return tx_message(config.last_message, frame->data[config.address + 1], frame->data[config.address + 2]);
}
}
return 0;
}
int display_process(){
char* recv_buffer[8192];
//read and ignore bytes from the display for now
ssize_t bytes = read(config.display_fd, recv_buffer, sizeof(recv_buffer));
if(bytes <= 0){
printf("Error receiving from display: %s\n", strerror(errno));
return 1;
}
printf("%zu bytes from display\n", bytes);
return 0;
}
//use the same TLU, not that pretty but avoids having to pre-declare the config struct
#include "config.c"
void usage(char* fn){
printf("\nKLT ArtNet controller\n");
printf("Usage:\n");
printf("\t%s <config>\n", fn);
}
static void signal_handler(int signum){
config.shutdown = 1;
}
int main(int argc, char** argv){
fd_set read_fds;
int status;
if(argc < 2){
printf("No configuration given\n");
usage(argv[0]);
return EXIT_FAILURE;
}
if(config_parse(argv[1])){
printf("Failed to parse configuration\n");
config_free();
usage(argv[0]);
return EXIT_FAILURE;
}
signal(SIGINT, signal_handler);
config.last_message = NULL;
while(!config.shutdown){
FD_ZERO(&read_fds);
FD_SET(config.artnet_fd, &read_fds);
FD_SET(config.display_fd, &read_fds);
status = select((MAX(config.artnet_fd, config.display_fd)) + 1, &read_fds, NULL, NULL, NULL);
if(status > 0){
if(FD_ISSET(config.artnet_fd, &read_fds)){
if(artnet_process()){
break;
}
}
if(FD_ISSET(config.display_fd, &read_fds)){
if(display_process()){
break;
}
}
}
else if(status < 0){
printf("Input multiplexing failed: %s\n", strerror(errno));
break;
}
}
config_free();
return EXIT_SUCCESS;
}