add respondd.c to ffnw-node-info

ffnw-node-info/src/Makefile

+all: respondd.so
+
+CFLAGS += -Wall
+
+respondd.so: respondd.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -shared -fPIC -D_GNU_SOURCE -o $@ $^ $(LDLIBS) -lgluonutil -luci

ffnw-node-info/src/respondd.c

+/*
+  Copyright (c) 2016, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include <respondd.h>
+
+#include <json-c/json.h>
+#include <libgluonutil.h>
+
+#include <uci.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+
+static struct uci_section * get_first_section(struct uci_package *p, const char *type) {
+	struct uci_element *e;
+	uci_foreach_element(&p->sections, e) {
+		struct uci_section *s = uci_to_section(e);
+		if (!strcmp(s->type, type))
+			return s;
+	}
+
+	return NULL;
+}
+
+static const char * get_first_option(struct uci_context *ctx, struct uci_package *p, const char *type, const char *option) {
+	struct uci_section *s = get_first_section(p, type);
+	if (s)
+		return uci_lookup_option_string(ctx, s, option);
+	else
+		return NULL;
+}
+
+static struct json_object * get_number(struct uci_context *ctx, struct uci_section *s, const char *name) {
+	const char *val = uci_lookup_option_string(ctx, s, name);
+	if (!val || !*val)
+		return NULL;
+
+	char *end;
+	double d = strtod(val, &end);
+	if (*end)
+		return NULL;
+
+	return json_object_new_double(d);
+}
+
+static struct json_object * get_location(struct uci_context *ctx, struct uci_package *p) {
+	struct uci_section *s = get_first_section(p, "location");
+	if (!s)
+		return NULL;
+
+	const char *share = uci_lookup_option_string(ctx, s, "share_location");
+	if (!share || strcmp(share, "1"))
+		return NULL;
+
+	struct json_object *ret = json_object_new_object();
+
+	struct json_object *latitude = get_number(ctx, s, "latitude");
+	if (latitude)
+		json_object_object_add(ret, "latitude", latitude);
+
+	struct json_object *longitude = get_number(ctx, s, "longitude");
+	if (longitude)
+		json_object_object_add(ret, "longitude", longitude);
+
+	struct json_object *altitude = get_number(ctx, s, "altitude");
+	if (altitude)
+		json_object_object_add(ret, "altitude", altitude);
+
+	return ret;
+}
+
+static struct json_object * get_owner(struct uci_context *ctx, struct uci_package *p) {
+	const char *contact = get_first_option(ctx, p, "owner", "contact");
+	if (!contact || !*contact)
+		return NULL;
+
+	struct json_object *ret = json_object_new_object();
+	json_object_object_add(ret, "contact", gluonutil_wrap_string(contact));
+	return ret;
+}
+
+static struct json_object * get_system(struct uci_context *ctx, struct uci_package *p) {
+	struct json_object *ret = json_object_new_object();
+
+	const char *role = get_first_option(ctx, p, "system", "role");
+	if (role && *role)
+		json_object_object_add(ret, "role", gluonutil_wrap_string(role));
+
+	return ret;
+}
+
+static struct json_object * respondd_provider_nodeinfo(void) {
+	struct json_object *ret = json_object_new_object();
+
+	struct uci_context *ctx = uci_alloc_context();
+	ctx->flags &= ~UCI_FLAG_STRICT;
+
+	struct uci_package *p;
+	if (!uci_load(ctx, "gluon-node-info", &p)) {
+		struct json_object *location = get_location(ctx, p);
+		if (location)
+			json_object_object_add(ret, "location", location);
+
+		struct json_object *owner = get_owner(ctx, p);
+		if (owner)
+			json_object_object_add(ret, "owner", owner);
+
+		json_object_object_add(ret, "system", get_system(ctx, p));
+	}
+
+	uci_free_context(ctx);
+
+	return ret;
+}
+
+
+const struct respondd_provider_info respondd_providers[] = {
+	{"nodeinfo", respondd_provider_nodeinfo},
+	{}
+};