add hoodselector respondd c file #789

package/ffnw-hoodselector/src/respondd.c

+#include <respondd.h>
+#include <json-c/json.h>
+#include <libgluonutil.h>
+#include <uci.h>
+#include <string.h>
+#include <net/if.h>
+
+#define _STRINGIFY(s) #s
+#define STRINGIFY(s) _STRINGIFY(s)
+
+bool strstw(const char *pre, const char *str) {
+	size_t lenpre = strlen(pre);
+	return strlen(str) < lenpre ? false : strncmp(pre, str, lenpre) == 0;
+}
+
+bool strrmbs(char *line, int begin, int end) { // <- ist es hier sinvoller pointer auf die ints zu setzen??
+	size_t len = strlen(line);
+	if (len < begin)
+		return false;
+
+	memmove(line, line+begin, len - begin + 1);
+	if (len < end)
+		return false;
+
+	line[len-end] = 0; //remove val of end characters on the end
+	return true;
+}
+
+// extract hood informations
+static struct json_object * get_hoodselector(void) {
+	FILE *f = fopen("/tmp/.hoodselector", "r");
+	if (!f)
+		return NULL;
+
+	struct json_object *ret = json_object_new_object();
+	char *line = NULL;
+	size_t len = 0;
+	while (getline(&line, &len, f) >= 0) {
+		//1. Get md5 hash from current selected hood.
+		if (strstw("\"md5hash\": ",line)) {
+			if (!strrmbs(line, 12, 14))
+				continue;
+
+			json_object_object_add(ret, "md5hash", gluonutil_wrap_string(line));
+		}
+		//2. Get true or false string for VPN Router.
+		if (strstw("\"vpnrouter\": ",line)) {
+			if (!strrmbs(line, 14, 16))
+				continue;
+
+			json_object_object_add(ret, "vpnrouter", gluonutil_wrap_string(line));
+		}
+		//3. Get hoodname
+		if (strstw("\"hoodname\": ",line)) {
+			if (!strrmbs(line, 13, 15))
+				continue;
+
+			json_object_object_add(ret, "hoodname", gluonutil_wrap_string(line));
+		}
+	}
+	free(line);
+	fclose(f);
+	return ret;
+}
+
+//Get currend selected BSSID
+static struct json_object * get_current_selected_bssid(void){
+	struct uci_context *ctx = uci_alloc_context();
+	ctx->flags &= ~UCI_FLAG_STRICT;
+	struct uci_package *p;
+
+	if (uci_load(ctx, "wireless", &p))
+		goto end;
+
+	struct uci_element *e;
+	uci_foreach_element(&p->sections, e) {
+		struct uci_section *s = uci_to_section(e);
+		if (strcmp(s->type, "wifi-iface"))
+			continue;
+
+		if (strncmp(e->name, "ibss_", 5))
+			continue;
+
+		const char *bssid = uci_lookup_option_string(ctx, s, "bssid");
+		if (!bssid)
+			continue;
+
+		struct json_object *ret = json_object_new_object();
+		json_object_object_add(ret, "bssid", gluonutil_wrap_string(bssid));
+		free(bssid);
+		uci_free_context(ctx);
+		return ret;
+	}
+end:
+	uci_free_context(ctx);
+	return NULL;
+}
+
+
+// create final obj with logical structure
+static struct json_object * respondd_provider_hoodselector(void) {
+	struct json_object *ret = json_object_new_object();
+
+	struct json_object *hoodinfo = get_hoodselector();
+	if(hoodinfo)
+		json_object_object_add(ret, "hoodinfo", hoodinfo);
+
+	struct json_object *selectedbssid = get_current_selected_bssid();
+	if(selectedbssid)
+		json_object_object_add(ret, "selectedbssid", selectedbssid);
+
+	return ret;
+}
+
+// related to respondd_provider_hoodselector
+const struct respondd_provider_info respondd_providers[] = {
+	{"hoodselector", respondd_provider_hoodselector},
+	{}
+};