Commandline client and client library for the twinkl protocol
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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "config.h"
#include "message.h"
#include "twinklsocket.h"
const char port[] = "1337";
int main(int argc, char *argv[])
{
int twinklsocket;
if(argc != 3) {
fprintf(stderr,"usage: %s hostname priority\n", argv[0]);
exit(1);
}
twinklsocket = twinklsocket_open(argv[1], port);
if(twinklsocket == -1) {
exit(1);
}
struct twinkl_message msg;
unsigned long priority;
priority = strtoul(argv[2], NULL, 0);
if(priority == ULONG_MAX || priority > TWINKL_LEVEL_COUNT) {
fprintf(stderr, "Priority not in range 0..%d\n", TWINKL_LEVEL_COUNT);
exit(1);
}
twinkl_init_message(&msg);
twinkl_set_priority(&msg, priority);
int linecount = 0;
size_t len = 0;
char *line = NULL;
/*
* Line format: <channel> : <value>
* With arbitrary many spaces between the numbers and the colon
* Example: "5 : 42"
*/
while(!feof(stdin)) {
// Try to read a line from stdin, if the line is empty send the packet
if(getline(&line, &len, stdin) <= 1) {
int result = twinklsocket_send(twinklsocket, &msg);
if(result != 0) {
printf("There was an error while sending the twinkl packet.\n");
exit(1);
}
printf("Twinkl paket sent.\n");
twinkl_init_message(&msg);
twinkl_set_priority(&msg, priority);
continue;
}
char *colon, *end;
unsigned long chan, value;
linecount++;
chan = strtoul(line, &end, 0);
if(chan == ULONG_MAX || end == line) {
fprintf(stderr, "Invalid channel number for line %d\n", linecount);
continue;
}
if(chan > TWINKL_CHANNEL_COUNT) {
fprintf(stderr, "Channel number %lu not in range 0..%d for line %d\n",
chan,
TWINKL_CHANNEL_COUNT - 1,
linecount);
continue;
}
colon = strchr(end, ':');
if(colon == NULL) {
fprintf(stderr, "Missing delimiter in line %d\n", linecount);
continue;
}
// First char after the colon is value
value = strtoul(colon + 1, &end, 0);
if(value == ULONG_MAX || end == colon + 1) {
fprintf(stderr, "Invalid value for line %d\n", linecount);
continue;
}
if(value > 255) {
fprintf(stderr, "Value %lu for channel %lu is not in range 1..255 in line %d\n",
value,
chan,
linecount);
continue;
}
if(*end != '\n') {
fprintf(stderr, "Unecessary characters after value in line %d\n", linecount);
continue;
}
twinkl_set_value(&msg, chan, value);
}
free(line);
twinklsocket_close(twinklsocket);
return 0;
}