Initial upload of genskel as host toolHEADmaster

This change exports the genskel tool from the af-binder repo into its own source tree.
The tools is a generator that needs to execute on the compile host.

Bug-AGL: SPEC-941

Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>

9 files changed, 1798 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5e902eb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+autom4te.cache
+config.log
+build/*
+!.gitignore
+.dep.inc
+CMakeFiles/
+CMakeCache.txt
+Makefile
+cmake_install.cmake
+*.so
+.vscode
diff --git a/.gitreview b/.gitreview
new file mode 100644
index 0000000..fb96bf2
--- /dev/null
+++ b/.gitreview
@@ -0,0 +1,5 @@
+[gerrit]
+host=gerrit.automotivelinux.org
+port=29418
+project=src/app-framework-host-utilities
+defaultbranch=master
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..8264fcb
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,69 @@
+###########################################################################
+# Copyright 2017 Jan-Simon Möller dl9pf@gmx.de
+#
+# author: Jan-Simon Möller <dl9pf@gmx.de>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+###########################################################################
+
+CMAKE_MINIMUM_REQUIRED(VERSION 3.0)
+
+PROJECT(af-host-utils C CXX)
+
+SET(PROJECT_NAME "APPFW HOST UTILITIES")
+SET(PROJECT_PRETTY_NAME "Application Framework Host Utilities")
+SET(PROJECT_DESCRIPTION "Host Tools for the Application framework")
+SET(PROJECT_VERSION "4.99-EERC2")
+set(PROJECT_URL "https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/app-framework-host-utilities.git;a=summary")
+
+INCLUDE(FindPkgConfig)
+INCLUDE(CheckIncludeFiles)
+INCLUDE(CheckLibraryExists)
+INCLUDE(GNUInstallDirs)
+INCLUDE(CTest)
+
+###########################################################################
+
+link_libraries(-Wl,--as-needed -Wl,--gc-sections -Wl,--no-undefined)
+
+add_compile_options(-Wall -Wextra -Wconversion)
+add_compile_options(-Wno-unused-parameter) # frankly not using a parameter does it care?
+add_compile_options(-Wno-sign-compare -Wno-sign-conversion)
+add_compile_options(-Werror=maybe-uninitialized)
+add_compile_options(-Werror=implicit-function-declaration)
+add_compile_options(-ffunction-sections -fdata-sections)
+add_compile_options(-fPIC)
+add_compile_options(-g)
+
+set(CMAKE_C_FLAGS_PROFILING    "-g -O2 -pg -Wp,-U_FORTIFY_SOURCE")
+set(CMAKE_C_FLAGS_DEBUG        "-g -ggdb -Wp,-U_FORTIFY_SOURCE")
+set(CMAKE_C_FLAGS_RELEASE      "-g -O2")
+set(CMAKE_C_FLAGS_CCOV         "-g -O2 --coverage")
+
+###########################################################################
+
+INCLUDE(FindThreads)
+FIND_PACKAGE(Threads)
+
+PKG_CHECK_MODULES(json-c REQUIRED json-c)
+
+INCLUDE_DIRECTORIES(
+${INCLUDE_DIRS}
+${json-c_INCLUDE_DIRS}
+)
+
+SET(link_libraries
+${json-c_LDFLAGS}
+)
+
+ADD_SUBDIRECTORY(genskel)
diff --git a/LICENSE-2.0.txt b/LICENSE-2.0.txt
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE-2.0.txt
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      negligent acts) or agreed to in writing, shall any Contributor be
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
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+   Licensed under the Apache License, Version 2.0 (the "License");
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/genskel/CMakeLists.txt b/genskel/CMakeLists.txt
new file mode 100644
index 0000000..6263c85
--- /dev/null
+++ b/genskel/CMakeLists.txt
@@ -0,0 +1,31 @@
+###########################################################################
+# Copyright 2015, 2016, 2017 IoT.bzh
+#
+# author: José Bollo <jose.bollo@iot.bzh>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+###########################################################################
+cmake_minimum_required(VERSION 3.5)
+
+ADD_EXECUTABLE(afb-genskel genskel.c)
+ADD_EXECUTABLE(afb-exprefs exprefs.c)
+ADD_EXECUTABLE(afb-json2c json2c.c)
+
+TARGET_LINK_LIBRARIES(afb-genskel ${link_libraries})
+TARGET_LINK_LIBRARIES(afb-exprefs ${link_libraries})
+TARGET_LINK_LIBRARIES(afb-json2c ${link_libraries})
+
+INSTALL(TARGETS afb-genskel RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+INSTALL(TARGETS afb-exprefs RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+INSTALL(TARGETS afb-json2c  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+
diff --git a/genskel/exprefs.c b/genskel/exprefs.c
new file mode 100644
index 0000000..4ea44b4
--- /dev/null
+++ b/genskel/exprefs.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": { "$ref": "#/type/a" }
+ *    }
+ *  }
+ *
+ * will be exapanded to
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": "int"
+ *    }
+ *  }
+ *
+ * Invocation:   program  [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <json-c/json.h>
+
+/**
+ * records path to the expanded node
+ */
+struct path
+{
+	struct json_object *object;	/**< node being expanded */
+	struct path *upper;		/**< link to upper expanded nodes */
+};
+
+/**
+ * root of the JSON being parsed
+ */
+struct json_object *root;
+
+/**
+ * Search for a reference of type "#/a/b/c" int the
+ * parsed JSON object
+ */
+struct json_object *search(const char *path)
+{
+	char *d;
+	struct json_object *i;
+
+	/* does it match #/ at the beginning? */
+	if (path[0] != '#' || (path[0] && path[1] != '/'))
+		return NULL;
+
+	/* search from root to target */
+	i = root;
+	d = strdupa(path+2);
+	d = strtok(d, "/");
+	while(i && d) {
+		if (!json_object_object_get_ex(i, d, &i))
+			return NULL;
+		d = strtok(NULL, "/");
+	}
+	return i;
+}
+
+/**
+ * Expands the node designated by path and returns its expanded form
+ */
+struct json_object *expand(struct path path)
+{
+	struct path *p;
+	struct json_object *o, *x;
+	int n, i;
+	struct json_object_iterator ji, jn;
+
+	/* expansion depends of the type of the node */
+	switch (json_object_get_type(path.object)) {
+	case json_type_object:
+		/* for object, look if it contains a property "$ref" */
+		if (json_object_object_get_ex(path.object, "$ref", &o)) {
+			/* yes, reference, try to substitute its target */
+			if (!json_object_is_type(o, json_type_string)) {
+				fprintf(stderr, "found a $ref not being string. Is: %s\n", json_object_get_string(o));
+				exit(1);
+			}
+			x = search(json_object_get_string(o));
+			if (!x) {
+				fprintf(stderr, "$ref not found. Was: %s\n", json_object_get_string(o));
+				exit(1);
+			}
+			p = &path;
+			while(p) {
+				if (x == p->object) {
+					fprintf(stderr, "$ref recursive. Was: %s\n", json_object_get_string(o));
+					exit(1);
+				}
+				p = p->upper;
+			}
+			/* cool found, return a new instance of the target */
+			return json_object_get(x);
+		}
+		/* no, expand the values */
+		ji = json_object_iter_begin(path.object);
+		jn = json_object_iter_end(path.object);
+		while (!json_object_iter_equal(&ji, &jn)) {
+			o = json_object_iter_peek_value(&ji);
+			x = expand((struct path){ .object = o, .upper = &path });
+			if (x != o)
+				json_object_object_add(path.object, json_object_iter_peek_name(&ji), x);
+			json_object_iter_next(&ji);
+		}
+		break;
+	case json_type_array:
+		/* expand the values of arrays */
+		i = 0;
+		n = json_object_array_length(path.object);
+		while (i != n) {
+			o = json_object_array_get_idx(path.object, i);
+			x = expand((struct path){ .object = o, .upper = &path });
+			if (x != o)
+				json_object_array_put_idx(path.object, i, x);
+			i++;
+		}
+		break;
+	default:
+		/* otherwise no expansion */
+		break;
+	}
+	/* return the given node */
+	return path.object;
+}
+
+/**
+ * process a file and prints its expansion on stdout
+ */
+void process(char *filename)
+{
+	/* translate - */
+	if (!strcmp(filename, "-"))
+		filename = "/dev/stdin";
+
+	/* check access */
+	if (access(filename, R_OK)) {
+		fprintf(stderr, "can't access file %s\n", filename);
+		exit(1);
+	}
+
+	/* read the file */
+	root = json_object_from_file(filename);
+	if (!root) {
+		fprintf(stderr, "reading file %s produced null\n", filename);
+		exit(1);
+	}
+
+	/* expand */
+	root = expand((struct path){ .object = root, .upper = NULL });
+
+	/* print the result */
+	json_object_to_file_ext ("/dev/stdout", root, JSON_C_TO_STRING_PRETTY);
+
+	/* clean up */
+	json_object_put(root);
+}
+
+/** process the list of files or stdin if none */
+int main(int ac, char **av)
+{
+	if (!*++av)
+		process("-");
+	else {
+		do { process(*av); } while(*++av);
+	}
+	return 0;
+}
+
diff --git a/genskel/genskel.c b/genskel/genskel.c
new file mode 100644
index 0000000..62dfe3f
--- /dev/null
+++ b/genskel/genskel.c
@@ -0,0 +1,708 @@
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": { "$ref": "#/type/a" }
+ *    }
+ *  }
+ *
+ * will be exapanded to
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": "int"
+ *    }
+ *  }
+ *
+ * Invocation:   program  [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ctype.h>
+
+#include <json-c/json.h>
+
+#define oom(x) do{if(!(x)){fprintf(stderr,"out of memory\n");exit(1);}}while(0)
+
+/**
+ * records path to the expanded node
+ */
+struct path
+{
+	struct json_object *object;	/**< node being expanded */
+	struct path *upper;		/**< link to upper expanded nodes */
+};
+
+/**
+ * root of the JSON being parsed
+ */
+struct json_object *root = NULL;
+struct json_object *d_perms = NULL;
+struct json_object *a_perms = NULL;
+const char *preinit = NULL;
+const char *init = NULL;
+const char *onevent = NULL;
+const char *api = NULL;
+const char *scope = NULL;
+const char *prefix = NULL;
+const char *postfix = NULL;
+char *capi = NULL;
+int priv = -1;
+int noconc = -1;
+
+/**
+ * Search for a reference of type "#/a/b/c" int the
+ * parsed JSON object
+ */
+struct json_object *search(const char *path)
+{
+	char *d;
+	struct json_object *i;
+
+	/* does it match #/ at the beginning? */
+	if (path[0] != '#' || (path[0] && path[1] != '/'))
+		return NULL;
+
+	/* search from root to target */
+	i = root;
+	d = strdupa(path+2);
+	d = strtok(d, "/");
+	while(i && d) {
+		if (!json_object_object_get_ex(i, d, &i))
+			return NULL;
+		d = strtok(NULL, "/");
+	}
+	return i;
+}
+
+/**
+ * Expands the node designated by path and returns its expanded form
+ */
+struct json_object *expand_$ref(struct path path)
+{
+	struct path *p;
+	struct json_object *o, *x;
+	int n, i;
+	struct json_object_iterator ji, jn;
+
+	/* expansion depends of the type of the node */
+	switch (json_object_get_type(path.object)) {
+	case json_type_object:
+		/* for object, look if it contains a property "$ref" */
+		if (json_object_object_get_ex(path.object, "$ref", &o)) {
+			/* yes, reference, try to substitute its target */
+			if (!json_object_is_type(o, json_type_string)) {
+				fprintf(stderr, "found a $ref not being string. Is: %s\n", json_object_get_string(o));
+				exit(1);
+			}
+			x = search(json_object_get_string(o));
+			if (!x) {
+				fprintf(stderr, "$ref not found. Was: %s\n", json_object_get_string(o));
+				exit(1);
+			}
+			p = &path;
+			while(p) {
+				if (x == p->object) {
+					fprintf(stderr, "$ref recursive. Was: %s\n", json_object_get_string(o));
+					exit(1);
+				}
+				p = p->upper;
+			}
+			/* cool found, return a new instance of the target */
+			return json_object_get(x);
+		}
+		/* no, expand the values */
+		ji = json_object_iter_begin(path.object);
+		jn = json_object_iter_end(path.object);
+		while (!json_object_iter_equal(&ji, &jn)) {
+			o = json_object_iter_peek_value(&ji);
+			x = expand_$ref((struct path){ .object = o, .upper = &path });
+			if (x != o)
+				json_object_object_add(path.object, json_object_iter_peek_name(&ji), x);
+			json_object_iter_next(&ji);
+		}
+		break;
+	case json_type_array:
+		/* expand the values of arrays */
+		i = 0;
+		n = json_object_array_length(path.object);
+		while (i != n) {
+			o = json_object_array_get_idx(path.object, i);
+			x = expand_$ref((struct path){ .object = o, .upper = &path });
+			if (x != o)
+				json_object_array_put_idx(path.object, i, x);
+			i++;
+		}
+		break;
+	default:
+		/* otherwise no expansion */
+		break;
+	}
+
+	/* return the given node */
+	return path.object;
+}
+
+char *cify(const char *str)
+{
+	char *r = strdup(str);
+	int i = 0;
+	while (r && r[i]) {
+		if (!isalnum(r[i]))
+			r[i] = '_';
+		i++;
+	}
+	return r;
+}
+
+char *make_info(const char *text, int split)
+{
+	const char *a, *b;
+	char *desc, c, buf[3];
+	size_t len;
+	int i, pos, e;
+
+	/* estimated length */
+	a = b = text;
+	len = 1;
+	while((c = *b++)) {
+		len += 1 + ('"' == c);
+	}
+
+	len += 7 * (1 + len / 72);
+	desc = malloc(len);
+	oom(desc);
+
+	len = pos = 0;
+	if (!split)
+		desc[len++] = '"';
+	b = a;
+	while((c = *b++)) {
+		if (c == '"') {
+			buf[0] = '\\';
+			buf[1] = '"';
+			buf[2] = 0;
+		}
+		else if (c == '\\') {
+			switch ((c = *b++)) {
+			case 0:
+				b--;
+				break;
+			case '/':
+				buf[0] = '/';
+				buf[1] = 0;
+				break;
+			default:
+				buf[0] = '\\';
+				buf[1] = c;
+				buf[2] = 0;
+				break;
+			}
+		}
+		else {
+			buf[0] = c;
+			buf[1] = 0;
+		}
+		i = e = 0;
+		while (buf[i]) {
+			if (split) {
+				if (pos >= 77 && !e) {
+					desc[len++] = '"';
+					desc[len++] = '\n';
+					pos = 0;
+				}
+				if (pos == 0) {
+					desc[len++] = ' ';
+					desc[len++] = ' ';
+					desc[len++] = ' ';
+					desc[len++] = ' ';
+					desc[len++] = '"';
+					pos = 5;
+				}
+			}
+			c = buf[i++];
+			desc[len++] = c;
+			e = !e && c == '\\';
+			pos++;
+		}
+	}
+	desc[len++] = '"';
+	if (split)
+		desc[len++] = '\n';
+	desc[len] = 0;
+	return desc;
+}
+
+char *make_desc(struct json_object *o)
+{
+	return make_info(json_object_to_json_string_ext(root, 0), 1);
+}
+
+struct json_object *permissions_of_verb(struct json_object *obj)
+{
+	struct json_object *x, *y;
+
+	if (json_object_object_get_ex(obj, "x-permissions", &x))
+		return x;
+
+	if (json_object_object_get_ex(obj, "get", &x))
+		if (json_object_object_get_ex(x, "x-permissions", &y))
+			return y;
+
+	return NULL;
+}
+
+void print_perms()
+{
+	int i, n;
+
+	n = a_perms ? json_object_array_length(a_perms) : 0;
+	if (n) {
+		printf("static const struct afb_auth _afb_auths_v2_%s[] = {\n" , capi);
+		i = 0;
+		while (i < n) {
+			printf("\t{ %s }", json_object_get_string(json_object_array_get_idx(a_perms, i)));
+			printf(",\n"+(++i == n));
+		}
+		printf("};\n\n");
+	}
+}
+
+struct json_object *new_perm(struct json_object *obj, const char *desc)
+{
+	const char *tag;
+	char *b;
+	struct json_object *x, *y;
+
+	tag = obj ? json_object_to_json_string_ext(obj, 0) : desc;
+	if (!json_object_object_get_ex(d_perms, tag, &y)) {
+		if (!d_perms) {
+			d_perms = json_object_new_object();
+			a_perms = json_object_new_array();
+		}
+
+		asprintf(&b, "&_afb_auths_v2_%s[%d]", capi, json_object_array_length(a_perms));
+		x = json_object_new_string(desc);
+		y = json_object_new_string(b);
+		json_object_array_add(a_perms, x);
+		json_object_object_add(d_perms, tag, y);
+		free(b);
+	}
+	return y;
+}
+
+struct json_object *decl_perm(struct json_object *obj);
+
+struct json_object *decl_perm_a(const char *op, struct json_object *obj)
+{
+	int i, n;
+	char *a;
+	struct json_object *x, *y;
+
+	x = NULL;
+	i = n = obj ? json_object_array_length(obj) : 0;
+	while (i) {
+		y = decl_perm(json_object_array_get_idx(obj, --i));
+		if (!y)
+			;
+		else if (!x)
+			x = y;
+		else if (x != y) {
+			asprintf(&a, ".type = afb_auth_%s, .first = %s, .next = %s",
+				 op, json_object_get_string(y), json_object_get_string(x));
+			x = new_perm(NULL, a);
+			free(a);
+		}
+	}
+	return x;
+}
+
+struct json_object *decl_perm(struct json_object *obj)
+{
+	char *a;
+	struct json_object *x, *y;
+
+	if (json_object_object_get_ex(d_perms, json_object_to_json_string_ext(obj, 0), &x))
+		return x;
+
+	if (json_object_object_get_ex(obj, "permission", &x)) {
+		asprintf(&a, ".type = afb_auth_Permission, .text = \"%s\"", json_object_get_string(x));
+		y = new_perm(obj, a);
+		free(a);
+	}
+	else if (json_object_object_get_ex(obj, "anyOf", &x)) {
+		y = decl_perm_a("Or", x);
+	}
+	else if (json_object_object_get_ex(obj, "allOf", &x)) {
+		y = decl_perm_a("And", x);
+	}
+	else if (json_object_object_get_ex(obj, "not", &x)) {
+		x = decl_perm(x);
+		asprintf(&a, ".type = afb_auth_Not, .first = %s", json_object_get_string(x));
+		y = new_perm(obj, a);
+		free(a);
+	}
+	else if (json_object_object_get_ex(obj, "LOA", &x))
+		y = NULL;
+	else if (json_object_object_get_ex(obj, "session", &x))
+		y = NULL;
+	else
+		y = NULL;
+
+	return y;
+}
+
+void declare_permissions(const char *name, struct json_object *obj)
+{
+	struct json_object *p;
+
+	p = permissions_of_verb(obj);
+	if (p)
+		decl_perm(p);
+}
+
+
+#define SESSION_CLOSE  0x000001
+#define SESSION_RENEW  0x000010
+#define SESSION_CHECK  0x000100
+#define SESSION_LOA_1  0x001000
+#define SESSION_LOA_2  0x011000
+#define SESSION_LOA_3  0x111000
+#define SESSION_MASK   0x111111
+
+
+int get_session(struct json_object *obj);
+
+int get_session_a(int and, struct json_object *obj)
+{
+	int i, n, x, y;
+
+	n = obj ? json_object_array_length(obj) : 0;
+	if (n == 0)
+		return 0;
+
+	i = n;
+	x = get_session(json_object_array_get_idx(obj, --i));
+	while (i) {
+		y = get_session(json_object_array_get_idx(obj, --i));
+		if (and)
+			x &= y;
+		else
+			x |= y;
+	}
+	return x;
+}
+
+int get_session(struct json_object *obj)
+{
+	int y;
+	const char *a;
+	struct json_object *x;
+
+	y = 0;
+	if (json_object_object_get_ex(obj, "anyOf", &x)) {
+		y = get_session_a(1, x);
+	}
+	else if (json_object_object_get_ex(obj, "allOf", &x)) {
+		y = get_session_a(0, x);
+	}
+	else if (json_object_object_get_ex(obj, "not", &x)) {
+		y = ~get_session(x) & SESSION_MASK;
+	}
+	else if (json_object_object_get_ex(obj, "LOA", &x)) {
+		switch (json_object_get_int(x)) {
+		case 3: y = SESSION_LOA_3; break;
+		case 2: y = SESSION_LOA_2; break;
+		case 1: y = SESSION_LOA_1; break;
+		default: break;
+		}
+	}
+	else if (json_object_object_get_ex(obj, "session", &x)) {
+		a = json_object_get_string(x);
+		if (!strcmp(a, "check"))
+			y = SESSION_CHECK;
+		else if (!strcmp(a, "close"))
+			y = SESSION_CLOSE;
+	}
+	else if (json_object_object_get_ex(obj, "token", &x)) {
+		a = json_object_get_string(x);
+		if (!strcmp(a, "refresh"))
+			y = SESSION_RENEW;
+	}
+
+	return y;
+}
+
+void print_session(struct json_object *p)
+{
+	int s, c, l;
+
+	s = p ? get_session(p) : 0;
+	c = 1;
+	if (s & SESSION_CHECK) {
+		printf("%s", "|AFB_SESSION_CHECK_V2" + c);
+		c = 0;
+	}
+	if (s & SESSION_LOA_3 & ~SESSION_LOA_2)
+		l = 3;
+	else if (s & SESSION_LOA_2 & ~SESSION_LOA_1)
+		l = 2;
+	else if (s & SESSION_LOA_1)
+		l = 1;
+	else
+		l = 0;
+	if (l) {
+		printf("%s%d_V2", "|AFB_SESSION_LOA_" + c, l);
+		c = 0;
+	}
+	if (s & SESSION_CLOSE) {
+		printf("%s", "|AFB_SESSION_CLOSE_V2" + c);
+		c = 0;
+	}
+	if (s & SESSION_RENEW) {
+		printf("%s", "|AFB_SESSION_REFRESH_V2" + c);
+		c = 0;
+	}
+	if (c)
+		printf("AFB_SESSION_NONE_V2");
+}
+
+void print_verb(const char *name)
+{
+	printf("%s%s%s" , prefix, name, postfix);
+}
+
+void print_declare_verb(const char *name, struct json_object *obj)
+{
+	printf("%s void ", scope);
+	print_verb(name);
+	printf("(struct afb_req req);\n");
+}
+
+void print_struct_verb(const char *name, struct json_object *obj)
+{
+	struct json_object *p, *i;
+	const char *info;
+
+	info = NULL;
+	if (json_object_object_get_ex(obj, "description", &i))
+		info = json_object_get_string(i);
+
+	p = permissions_of_verb(obj);
+	printf(
+		"    {\n"
+		"        .verb = \"%s\",\n"
+		"        .callback = "
+		, name
+	);
+	print_verb(name);
+	printf(
+		",\n"
+		"        .auth = %s,\n"
+		"        .info = %s,\n"
+		"        .session = "
+		, p && decl_perm(p) ? json_object_get_string(decl_perm(p)) : "NULL"
+		, info ? make_info(info, 0) : "NULL"
+	);
+	print_session(p);
+	printf(
+		"\n"
+		"    },\n"
+	);
+}
+
+void enum_verbs(void (*func)(const char *name, struct json_object *obj))
+{
+	struct json_object_iterator ji, jn;
+	struct json_object *paths, *obj;
+	const char *name;
+
+	/* search the verbs */
+	paths = search("#/paths");
+	if (!paths)
+		return;
+
+	/* list the verbs and sort it */
+	ji = json_object_iter_begin(paths);
+	jn = json_object_iter_end(paths);
+	while (!json_object_iter_equal(&ji, &jn)) {
+		name = json_object_iter_peek_name(&ji);
+		obj = json_object_iter_peek_value(&ji);
+		name += (*name == '/');
+		func(name, obj);
+		json_object_iter_next(&ji);
+	}
+}
+
+void getvarbool(int *var, const char *path, int defval)
+{
+	struct json_object *o;
+
+	if (*var != 0 && *var != 1) {
+		o = search(path);
+		if (o && json_object_is_type(o, json_type_boolean))
+			*var = json_object_get_boolean(o);
+		else
+			*var = !!defval;
+	}
+}
+
+void getvar(const char **var, const char *path, const char *defval)
+{
+	struct json_object *o;
+
+	if (!*var) {
+		o = search(path);
+		if (o && json_object_is_type(o, json_type_string))
+			*var = json_object_get_string(o);
+		else
+			*var = defval;
+	}
+}
+
+/**
+ * process a file and prints its expansion on stdout
+ */
+void process(char *filename)
+{
+	char *desc;
+	const char *info;
+
+	/* translate - */
+	if (!strcmp(filename, "-"))
+		filename = "/dev/stdin";
+
+	/* check access */
+	if (access(filename, R_OK)) {
+		fprintf(stderr, "can't access file %s\n", filename);
+		exit(1);
+	}
+
+	/* read the file */
+	root = json_object_from_file(filename);
+	if (!root) {
+		fprintf(stderr, "reading file %s produced null\n", filename);
+		exit(1);
+	}
+
+	/* create the description */
+	desc = make_desc(root);
+
+	/* expand references */
+	root = expand_$ref((struct path){ .object = root, .upper = NULL });
+
+	/* get some names */
+	getvar(&api, "#/info/x-binding-c-generator/api", NULL);
+	getvar(&preinit, "#/info/x-binding-c-generator/preinit", NULL);
+	getvar(&init, "#/info/x-binding-c-generator/init", NULL);
+	getvar(&onevent, "#/info/x-binding-c-generator/onevent", NULL);
+	getvar(&scope, "#/info/x-binding-c-generator/scope", "static");
+	getvar(&prefix, "#/info/x-binding-c-generator/prefix", "afb_verb_");
+	getvar(&postfix, "#/info/x-binding-c-generator/postfix", "_cb");
+	getvarbool(&priv, "#/info/x-binding-c-generator/private", 0);
+	getvarbool(&noconc, "#/info/x-binding-c-generator/noconcurrency", 0);
+	getvar(&api, "#/info/title", "?");
+	info = NULL;
+	getvar(&info, "#/info/description", NULL);
+	capi = cify(api);
+
+	/* get the API name */
+	printf(
+		"\n"
+		"static const char _afb_description_v2_%s[] =\n"
+		"%s"
+		";\n"
+		"\n"
+		, capi, desc
+	);
+	enum_verbs(declare_permissions);
+	print_perms();
+	enum_verbs(print_declare_verb);
+	printf(
+		"\n"
+		"static const struct afb_verb_v2 _afb_verbs_v2_%s[] = {\n"
+                , capi
+	);
+	enum_verbs(print_struct_verb);
+	printf(
+		"    {\n"
+		"        .verb = NULL,\n"
+		"        .callback = NULL,\n"
+		"        .auth = NULL,\n"
+		"        .info = NULL,\n"
+		"        .session = 0\n"
+		"	}\n"
+		"};\n"
+	);
+	printf(
+		"\n"
+		"%sconst struct afb_binding_v2 %s%s = {\n"
+		"    .api = \"%s\",\n"
+		"    .specification = _afb_description_v2_%s,\n"
+		"    .info = %s,\n"
+		"    .verbs = _afb_verbs_v2_%s,\n"
+		"    .preinit = %s,\n"
+		"    .init = %s,\n"
+		"    .onevent = %s,\n"
+		"    .noconcurrency = %d\n"
+		"};\n"
+		"\n"
+		, priv ? "static " : ""
+		, priv ? "_afb_binding_v2_" : "afbBindingV2"
+		, priv ? capi : ""
+		, api
+		, capi
+		, info ? make_info(info, 0) : "NULL"
+		, capi
+		, preinit ?: "NULL"
+		, init ?: "NULL"
+		, onevent ?: "NULL"
+		, !!noconc
+	);
+
+	/* clean up */
+	json_object_put(root);
+	free(desc);
+}
+
+/** process the list of files or stdin if none */
+int main(int ac, char **av)
+{
+	if (!*++av)
+		process("-");
+	else {
+		do { process(*av); } while(*++av);
+	}
+	return 0;
+}
+
+
+
+
+
diff --git a/genskel/json2c.c b/genskel/json2c.c
new file mode 100644
index 0000000..109b6ee
--- /dev/null
+++ b/genskel/json2c.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": { "$ref": "#/type/a" }
+ *    }
+ *  }
+ *
+ * will be exapanded to
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": "int"
+ *    }
+ *  }
+ *
+ * Invocation:   program  [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <json-c/json.h>
+
+#define oom(x) do{if(!(x)){fprintf(stderr,"out of memory\n");exit(1);}}while(0)
+
+/**
+ * root of the JSON being parsed
+ */
+struct json_object *root = NULL;
+
+char *make_desc(struct json_object *o)
+{
+	const char *a, *b;
+	char *desc, c, buf[3];
+	size_t len;
+	int i, pos, e;
+
+	a = b = json_object_to_json_string_ext(root, 0);
+	len = 1;
+	while((c = *b++)) {
+		len += 1 + ('"' == c);
+	}
+
+	len += 7 * (1 + len / 72);
+	desc = malloc(len);
+	oom(desc);
+
+	len = pos = 0;
+	b = a;
+	while((c = *b++)) {
+		if (c == '"') {
+			buf[0] = '\\';
+			buf[1] = '"';
+			buf[2] = 0;
+		}
+		else if (c == '\\') {
+			switch ((c = *b++)) {
+			case 0:
+				b--;
+				break;
+			case '/':
+				buf[0] = '/';
+				buf[1] = 0;
+				break;
+			default:
+				buf[0] = '\\';
+				buf[1] = c;
+				buf[2] = 0;
+				break;
+			}
+		}
+		else {
+			buf[0] = c;
+			buf[1] = 0;
+		}
+		i = e = 0;
+		while (buf[i]) {
+			if (pos >= 77 && !e) {
+				desc[len++] = '"';
+				desc[len++] = '\n';
+				pos = 0;
+			}
+			if (pos == 0) {
+				desc[len++] = ' ';
+				desc[len++] = ' ';
+				desc[len++] = ' ';
+				desc[len++] = ' ';
+				desc[len++] = '"';
+				pos = 5;
+			}
+			c = buf[i++];
+			desc[len++] = c;
+			e = !e && c == '\\';
+			pos++;
+		}
+	}
+	desc[len++] = '"';
+	desc[len++] = '\n';
+	desc[len] = 0;
+	return desc;
+}
+
+/**
+ * process a file and prints its expansion on stdout
+ */
+void process(char *filename)
+{
+	char *desc;
+
+	/* translate - */
+	if (!strcmp(filename, "-"))
+		filename = "/dev/stdin";
+
+	/* check access */
+	if (access(filename, R_OK)) {
+		fprintf(stderr, "can't access file %s\n", filename);
+		exit(1);
+	}
+
+	/* read the file */
+	root = json_object_from_file(filename);
+	if (!root) {
+		fprintf(stderr, "reading file %s produced null\n", filename);
+		exit(1);
+	}
+
+	/* create the description */
+	desc = make_desc(root);
+
+	printf("%s", desc);
+
+	/* clean up */
+	json_object_put(root);
+	free(desc);
+}
+
+/** process the list of files or stdin if none */
+int main(int ac, char **av)
+{
+	if (!*++av)
+		process("-");
+	else {
+		do { process(*av); } while(*++av);
+	}
+	return 0;
+}
+
+
diff --git a/genskel/monitor-api.json b/genskel/monitor-api.json
new file mode 100644
index 0000000..8361d57
--- /dev/null
+++ b/genskel/monitor-api.json
@@ -0,0 +1,400 @@
+{
+  "openapi": "3.0.0",
+  "info": {
+    "description": "monitoring of bindings and internals",
+    "title": "monitor",
+    "version": "1.0",
+    "x-binding-c-generator": {
+      "api": "monitor",
+      "version": 2,
+      "prefix": "f_",
+      "postfix": "",
+      "preinit": null,
+      "init": null,
+      "onevent": null,
+      "scope": "static",
+      "private": true
+    }
+  },
+  "servers": [
+    {
+      "url": "ws://{host}:{port}/api/monitor",
+      "description": "The API server.",
+      "variables": {
+        "host": {
+          "default": "localhost"
+        },
+        "port": {
+          "default": "1234"
+        }
+      },
+      "x-afb-events": [
+        {
+          "$ref": "#/components/schemas/afb-event"
+        }
+      ]
+    }
+  ],
+  "components": {
+    "schemas": {
+      "afb-reply": {
+        "$ref": "#/components/schemas/afb-reply-v1"
+      },
+      "afb-event": {
+        "$ref": "#/components/schemas/afb-event-v1"
+      },
+      "afb-reply-v1": {
+        "title": "Generic response.",
+        "type": "object",
+        "required": [ "jtype", "request" ],
+        "properties": {
+          "jtype": {
+            "type": "string",
+            "const": "afb-reply"
+          },
+          "request": {
+            "type": "object",
+            "required": [ "status" ],
+            "properties": {
+              "status": { "type": "string" },
+              "info": { "type": "string" },
+              "token": { "type": "string" },
+              "uuid": { "type": "string" },
+              "reqid": { "type": "string" }
+            }
+          },
+          "response": { "type": "object" }
+        }
+      },
+      "afb-event-v1": {
+        "type": "object",
+        "required": [ "jtype", "event" ],
+        "properties": {
+          "jtype": {
+            "type": "string",
+            "const": "afb-event"
+          },
+          "event": { "type": "string" },
+          "data": { "type": "object" }
+        }
+      },
+      "set-verbosity": {
+        "anyOf": [
+          { "$ref": "#/components/schemas/verbosity-map" },
+          { "$ref": "#/components/schemas/verbosity-level" }
+        ]
+      },
+      "get-request": {
+        "type": "object",
+        "properties": {
+          "verbosity": { "$ref": "#/components/schemas/get-verbosity" },
+          "apis": { "$ref": "#/components/schemas/get-apis" }
+        }
+      },
+      "get-response": {
+        "type": "object",
+        "properties": {
+          "verbosity": { "$ref": "#/components/schemas/verbosity-map" },
+          "apis": { "type": "object" }
+        }
+      },
+      "get-verbosity": {
+        "anyOf": [
+          { "type": "boolean" },
+          { "type": "array", "items": { "type": "string" } },
+          { "type": "object" }
+        ]
+      },
+      "get-apis": {
+        "anyOf": [
+          { "type": "boolean" },
+          { "type": "array", "items": { "type": "string" } },
+          { "type": "object" }
+        ]
+      },
+      "verbosity-map": {
+        "type": "object",
+        "patternProperties": { "^.*$": { "$ref": "#/components/schemas/verbosity-level" } }
+      },
+      "verbosity-level": {
+        "enum": [ "debug", 3, "info", 2, "notice", "warning", 1, "error", 0 ]
+      },
+      "trace-add": {
+        "anyOf": [
+          { "type": "array", "items": { "$ref": "#/components/schemas/trace-add-object" } },
+          { "$ref": "#/components/schemas/trace-add-any" }
+        ]
+      },
+      "trace-add-any": {
+        "anyOf": [
+          { "$ref": "#/components/schemas/trace-add-request" },
+          { "$ref": "#/components/schemas/trace-add-object" }
+        ]
+      },
+      "trace-add-object": {
+        "type": "object",
+        "properties": {
+          "name": { "type": "string", "description": "name of the generated event", "default": "trace" },
+          "tag": { "type": "string", "description": "tag for grouping traces", "default": "trace" },
+          "api": { "type": "string", "description": "api for requests, daemons and services" },
+          "verb": { "type": "string", "description": "verb for requests" },
+          "session": { "type": "string", "description": "session for requests" },
+          "pattern": { "type": "string", "description": "pattern for events" },
+          "request": { "$ref": "#/components/schemas/trace-add-request" },
+          "daemon": { "$ref": "#/components/schemas/trace-add-daemon" },
+          "service": { "$ref": "#/components/schemas/trace-add-service" },
+          "event": { "$ref": "#/components/schemas/trace-add-event" },
+          "for": { "$ref": "#/components/schemas/trace-add" }
+        },
+        "examples": [
+          { "tag": "1", "for": [ "common", { "api": "xxx", "request": "*", "daemon": "*", "service": "*" } ] }
+        ]
+      },
+      "trace-add-request": {
+        "anyOf": [
+          { "type": "array", "items": { "$ref": "#/components/schemas/trace-request-names" } },
+          { "$ref": "#/components/schemas/trace-request-names" }
+        ]
+      },
+      "trace-request-names": {
+        "title": "name of traceable items of requests",
+        "enum": [
+          "*",
+          "addref",
+          "all",
+          "args",
+          "begin",
+          "common",
+          "context",
+          "context_get",
+          "context_set",
+          "end",
+          "event",
+          "extra",
+          "fail",
+          "get",
+          "json",
+          "life",
+          "ref",
+          "result",
+          "session",
+          "session_close",
+          "session_set_LOA",
+          "simple",
+          "store",
+          "stores",
+          "subcall",
+          "subcall_result",
+          "subcalls",
+          "subcallsync",
+          "subcallsync_result",
+          "subscribe",
+          "success",
+          "unref",
+          "unstore",
+          "unsubscribe",
+          "vverbose"
+        ]
+      },
+      "trace-add-daemon": {
+        "anyOf": [
+          { "type": "array", "items": { "$ref": "#/components/schemas/trace-daemon-names" } },
+          { "$ref": "#/components/schemas/trace-daemon-names" }
+        ]
+      },
+      "trace-daemon-names": {
+        "title": "name of traceable items of daemons",
+        "enum": [
+          "*",
+          "all",
+          "common",
+          "event_broadcast_after",
+          "event_broadcast_before",
+          "event_make",
+          "extra",
+          "get_event_loop",
+          "get_system_bus",
+          "get_user_bus",
+          "queue_job",
+          "require_api",
+          "require_api_result",
+          "rootdir_get_fd",
+          "rootdir_open_locale",
+          "unstore_req",
+          "vverbose"
+        ]
+      },
+      "trace-add-service": {
+        "anyOf": [
+          { "type": "array", "items": { "$ref": "#/components/schemas/trace-service-names" } },
+          { "$ref": "#/components/schemas/trace-service-names" }
+        ]
+      },
+      "trace-service-names": {
+        "title": "name of traceable items of services",
+        "enum": [
+          "*",
+          "all",
+          "call",
+          "call_result",
+          "callsync",
+          "callsync_result",
+          "on_event_after",
+          "on_event_before",
+          "start_after",
+          "start_before"
+        ]
+      },
+      "trace-add-event": {
+        "anyOf": [
+          { "type": "array", "items": { "$ref": "#/components/schemas/trace-event-names" } },
+          { "$ref": "#/components/schemas/trace-event-names" }
+        ]
+      },
+      "trace-event-names": {
+        "title": "name of traceable items of events",
+        "enum": [
+          "*",
+          "all",
+          "broadcast_after",
+          "broadcast_before",
+          "common",
+          "create",
+          "drop",
+          "extra",
+          "name",
+          "push_after",
+          "push_before"
+        ]
+      },
+      "trace-drop": {
+        "anyOf": [
+          { "type": "boolean" },
+          {
+            "type": "object",
+            "properties": {
+              "event": { "anyOf": [  { "type": "string" }, { "type": "array", "items": "string" } ] },
+              "tag": { "anyOf": [  { "type": "string" }, { "type": "array", "items": "string" } ] },
+              "session": { "anyOf": [  { "type": "string" }, { "type": "array", "items": "string" } ] }
+            }
+          }
+        ]
+      }
+    },
+    "x-permissions": {
+        "trace": {
+          "permission": "urn:AGL:permission:monitor:public:trace"
+        },
+        "set": {
+          "permission": "urn:AGL:permission:monitor:public:set"
+        },
+        "get": {
+          "permission": "urn:AGL:permission:monitor:public:get"
+        },
+        "get-or-set": {
+          "anyOf": [
+            { "$ref": "#/components/x-permissions/get" },
+            { "$ref": "#/components/x-permissions/set" }
+          ]
+        }
+    }
+  },
+  "paths": {
+    "/get": {
+      "description": "Get monitoring data.",
+      "get": {
+        "x-permissions": {
+          "$ref": "#/components/x-permissions/get-or-set"
+        },
+        "parameters": [
+          {
+            "in": "query",
+            "name": "verbosity",
+            "required": false,
+            "schema": { "$ref": "#/components/schemas/get-verbosity" }
+          },
+          {
+            "in": "query",
+            "name": "apis",
+            "required": false,
+            "schema": { "$ref": "#/components/schemas/get-apis" }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A complex object array response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/afb-reply"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/set": {
+      "description": "Set monitoring actions.",
+      "get": {
+        "x-permissions": {
+          "$ref": "#/components/x-permissions/set"
+        },
+        "parameters": [
+          {
+            "in": "query",
+            "name": "verbosity",
+            "required": false,
+            "schema": { "$ref": "#/components/schemas/set-verbosity" }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A complex object array response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/afb-reply"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/trace": {
+      "description": "Set monitoring actions.",
+      "get": {
+        "x-permissions": {
+          "$ref": "#/components/x-permissions/trace"
+        },
+        "parameters": [
+          {
+            "in": "query",
+            "name": "add",
+            "required": false,
+            "schema": { "$ref": "#/components/schemas/trace-add" }
+          },
+          {
+            "in": "query",
+            "name": "drop",
+            "required": false,
+            "schema": { "$ref": "#/components/schemas/trace-drop" }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A complex object array response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/afb-reply"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}