added first version of fnordlicht frontend for volkszaehler.org

src/fnpom.c

@@ -0,0 +1,77 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <json/json.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
+#include "../lib/libfn.h"
+
+char * http_get_body(char * buffer) {
+	char * body;
+
+	for (body = buffer; body != '\0'; body++) {
+		if (body - buffer > 4) {
+			if (body[0] == '\r' && body[1] == '\n' && body[2] == '\r' && body[3] == '\n') {
+				return body + 4;
+			}
+		
+		}
+	}
+	
+	return NULL;
+}
+
+int main(int argc, char * argv[]) {
+	int sd, count;
+	
+	char host[] = "volkszaehler.org";
+	char port[] = "80";
+	char path[] = "/demo/backend.php/data/";
+	char uuid[] = "12345678-1234-1234-1234-123456789012";
+	char buffer[8192];
+	
+	struct addrinfo hints, *res;
+	struct json_tokener *tok;
+	struct json_object *obj;
+
+	/* set up connection */
+	memset(&hints, 0, sizeof hints);
+	hints.ai_family = AF_UNSPEC;    /* both IPv4 & IPv6 */
+	hints.ai_socktype = SOCK_STREAM;
+
+	getaddrinfo(host, port, &hints, &res);
+
+	sd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+	connect(sd, res->ai_addr, res->ai_addrlen);
+	if (sd < 0) {
+		perror(host);
+		exit(-1);
+	}
+	
+	/* send request */
+	sprintf(buffer, "GET %s/%s.json?from=yesterday&tuples=1 HTTP/1.0\r\n\r\n", path, uuid);
+	send(sd, buffer, strlen(buffer), 0);
+
+	/* receive data */
+	do { count = recv(sd, buffer, sizeof(buffer), 0); } while (count > 0);
+
+	char * json = http_get_body(buffer);
+	printf("%s\n", json);
+	
+	tok = json_tokener_new();
+	obj = json_tokener_parse_ex(tok, json, strlen(json));
+	
+	if (tok->err != json_tokener_success)
+		obj = error_ptr(-tok->err);
+		
+	printf("\n%s\n", json_object_to_json_string(obj));
+	
+	/* housekeeping */
+	json_tokener_free(tok);
+	close(sd);
+	
+	return 0;
+}