respondd: use C modules instead of Lua to provide data
This commit is contained in:
parent
bdb56bba02
commit
fd06c7d67d
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@ -13,7 +13,7 @@ include $(INCLUDE_DIR)/cmake.mk
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define Package/respondd
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SECTION:=net
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CATEGORY:=Network
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DEPENDS:=+liblua
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DEPENDS:=+libjson-c
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TITLE:=Responds to multicast queries with answers generated by Lua code
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endef
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@ -29,4 +29,9 @@ define Package/respondd/install
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$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/respondd $(1)/usr/bin/
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endef
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define Build/InstallDev
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$(INSTALL_DIR) $(1)/usr/include
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$(INSTALL_DATA) $(PKG_BUILD_DIR)/respondd.h $(1)/usr/include/
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endef
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$(eval $(call BuildPackage,respondd))
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@ -0,0 +1,37 @@
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respondd providers are C modules (shared objects). These modules should include
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<json-c/json.h> and <respondd.h>, the latter of which provides the following definitions:
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typedef struct json_object * (*respondd_provider)(void);
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struct respondd_provider_info {
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const char *request;
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const respondd_provider provider;
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};
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extern const struct respondd_provider_info respondd_providers[];
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The module must define the array `respondd_providers`, e.g. like this:
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static struct json_object * respondd_provider_nodeinfo(void) {
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...
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}
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static struct json_object * respondd_provider_statistics(void) {
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...
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}
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const struct respondd_provider_info respondd_providers[] = {
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{"nodeinfo", respondd_provider_nodeinfo},
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{"statistics", respondd_provider_statistics},
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{}
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};
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The array must be terminated with an empty entry. The provider for each
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request type must return a [JSON-C] JSON object. This JSON object must have exactly 1
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reference, and all other memory must be freed by the provider before returning.
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The JSON objects returned by different provider modules for the same request type
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are merged.
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[JSON-C]: https://github.com/json-c/json-c/wiki
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@ -1,14 +1,19 @@
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cmake_minimum_required(VERSION 2.6)
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set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})
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project(respondd C)
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find_package(Lua51 REQUIRED)
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find_package(JSON_C REQUIRED)
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set_property(DIRECTORY PROPERTY COMPILE_DEFINITIONS _GNU_SOURCE)
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include_directories(${LUA_INCLUDE_DIR})
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add_executable(respondd respondd.c)
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set_property(TARGET respondd PROPERTY COMPILE_FLAGS "-Wall -std=c99")
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target_link_libraries(respondd ${LUA_LIBRARIES} dl)
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set_property(TARGET respondd PROPERTY COMPILE_FLAGS "-Wall -std=c99 -fno-strict-aliasing ${JSON_C_CFLAGS_OTHER}")
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set_property(TARGET respondd PROPERTY LINK_FLAGS "${JSON_C_LDFLAGS_OTHER}")
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set_property(TARGET respondd APPEND PROPERTY INCLUDE_DIRECTORIES ${JSON_C_INCLUDE_DIR})
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target_link_libraries(respondd ${JSON_C_LIBRARIES} dl)
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install(TARGETS respondd RUNTIME DESTINATION bin)
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install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/respondd.h DESTINATION include)
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@ -0,0 +1,20 @@
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# Defines the following variables:
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# JSON_C_FOUND
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# JSON_C_INCLUDE_DIR
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# JSON_C_LIBRARIES
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# JSON_C_CFLAGS_OTHER
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# JSON_C_LDFLAGS_OTHER
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find_package(PkgConfig REQUIRED QUIET)
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pkg_check_modules(_JSON_C json-c)
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find_path(JSON_C_INCLUDE_DIR NAMES json-c/json.h HINTS ${_JSON_C_INCLUDE_DIRS})
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find_library(JSON_C_LIBRARIES NAMES json-c HINTS ${_JSON_C_LIBRARY_DIRS})
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set(JSON_C_CFLAGS_OTHER "${_JSON_C_CFLAGS_OTHER}" CACHE STRING "Additional compiler flags for json-c")
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set(JSON_C_LDFLAGS_OTHER "${_JSON_C_LDFLAGS_OTHER}" CACHE STRING "Additional linker flags for json-c")
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find_package_handle_standard_args(JSON_C REQUIRED_VARS JSON_C_LIBRARIES JSON_C_INCLUDE_DIR)
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mark_as_advanced(JSON_C_INCLUDE_DIR JSON_C_LIBRARIES JSON_C_CFLAGS_OTHER JSON_C_LDFLAGS_OTHER)
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File diff suppressed because it is too large
Load Diff
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@ -1,6 +1,6 @@
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/*
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Copyright (c) 2014-2015, Nils Schneider <nils@nilsschneider.net>
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Copyright (c) 2015, Matthias Schiffer <mschiffer@universe-factory.net>
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Copyright (c) 2015-2016, Matthias Schiffer <mschiffer@universe-factory.net>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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@ -24,10 +24,18 @@
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <lua.h>
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#include <lauxlib.h>
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#include <lualib.h>
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#include "respondd.h"
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#include "miniz.c"
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#include <json-c/json.h>
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#include <alloca.h>
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#include <dirent.h>
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#include <dlfcn.h>
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#include <inttypes.h>
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#include <search.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -41,150 +49,395 @@
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#include <sys/socket.h>
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struct provider_list {
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struct provider_list *next;
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char *name;
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respondd_provider provider;
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};
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struct request_type {
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struct provider_list *providers;
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struct json_object *cache;
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uint64_t cache_time;
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int64_t cache_timeout;
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};
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static int64_t now;
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static struct hsearch_data htab;
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static struct json_object * merge_json(struct json_object *a, struct json_object *b);
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static void usage() {
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puts("Usage: respondd [-h] -g <group> -p <port> -i <if0> [-i <if1> ..]");
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puts(" -g <ip6> multicast group, e.g. ff02::2:1001");
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puts(" -p <int> port number to listen on");
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puts(" -i <string> interface on which the group is joined");
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puts(" -c <string> Lua command");
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puts(" -h this help\n");
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puts("Usage:");
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puts(" respondd -h");
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puts(" respondd [-p <port>] [-g <group> -i <if0> [-i <if1> ..]] [-d <dir>]");
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puts(" -p <int> port number to listen on");
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puts(" -g <ip6> multicast group, e.g. ff02::2:1001");
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puts(" -i <string> interface on which the group is joined");
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puts(" -d <string> data provider directory (default: current directory)");
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puts(" -h this help\n");
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}
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static void join_mcast(const int sock, const struct in6_addr addr, const char *iface) {
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struct ipv6_mreq mreq;
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struct ipv6_mreq mreq;
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mreq.ipv6mr_multiaddr = addr;
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mreq.ipv6mr_interface = if_nametoindex(iface);
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mreq.ipv6mr_multiaddr = addr;
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mreq.ipv6mr_interface = if_nametoindex(iface);
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if (mreq.ipv6mr_interface == 0)
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goto error;
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if (mreq.ipv6mr_interface == 0)
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goto error;
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
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goto error;
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
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goto error;
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return;
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return;
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error:
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fprintf(stderr, "Could not join multicast group on %s: ", iface);
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perror(NULL);
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fprintf(stderr, "Could not join multicast group on %s: ", iface);
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perror(NULL);
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}
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static void serve(lua_State *L, int sock) {
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char buffer[256];
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ssize_t read_bytes;
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struct timespec tp;
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lua_pushvalue(L, -1);
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static void update_time(void) {
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struct timespec tp;
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clock_gettime(CLOCK_MONOTONIC, &tp);
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struct sockaddr_in6 addr;
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socklen_t addrlen = sizeof(addr);
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read_bytes = recvfrom(sock, buffer, sizeof(buffer), 0, (struct sockaddr *)&addr, &addrlen);
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if (read_bytes < 0) {
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perror("recvfrom failed");
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exit(EXIT_FAILURE);
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}
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clock_gettime(CLOCK_MONOTONIC, &tp);
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lua_pushlstring(L, buffer, read_bytes);
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lua_pushnumber(L, tp.tv_sec + 1.0e-9*tp.tv_nsec);
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if (lua_pcall(L, 2, 1, 0)) {
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fprintf(stderr, "%s\n", lua_tostring(L, -1));
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}
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else if (lua_isstring(L, -1)) {
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size_t msg_length;
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const char *msg = lua_tolstring(L, -1, &msg_length);
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if (sendto(sock, msg, msg_length, 0, (struct sockaddr *)&addr, addrlen) < 0)
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perror("sendto failed");
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}
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lua_pop(L, 1);
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now = (int64_t)tp.tv_sec * 1000 + tp.tv_nsec / 1000000;
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}
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/**
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* Merges two JSON objects
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*
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* On conflicts, object a will be preferred.
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*
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* Internally, this functions merges all entries from object a into object b,
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* so merging a small object a with a big object b is faster than vice-versa.
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*/
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static struct json_object * merge_json(struct json_object *a, struct json_object *b) {
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if (!json_object_is_type(a, json_type_object) || !json_object_is_type(b, json_type_object)) {
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json_object_put(b);
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return a;
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}
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json_object_object_foreach(a, key, val_a) {
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struct json_object *val_b;
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json_object_get(val_a);
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if (!json_object_object_get_ex(b, key, &val_b)) {
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json_object_object_add(b, key, val_a);
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continue;
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}
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json_object_get(val_b);
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json_object_object_add(b, key, merge_json(val_a, val_b));
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}
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json_object_put(a);
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return b;
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}
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static const struct respondd_provider_info * get_providers(const char *filename) {
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/*
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Prefix the filename with "./" to open the module in the current directory
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(dlopen looks in the standard library paths by default)
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*/
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char path[2 + strlen(filename) + 1];
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snprintf(path, sizeof(path), "./%s", filename);
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void *handle = dlopen(path, RTLD_NOW|RTLD_LOCAL);
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if (!handle)
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return NULL;
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const struct respondd_provider_info *ret = dlsym(handle, "respondd_providers");
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if (!ret) {
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dlclose(handle);
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return NULL;
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}
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return ret;
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}
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static void load_cache_time(struct request_type *r, const char *name) {
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r->cache = NULL;
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r->cache_time = 0;
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r->cache_timeout = now;
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char filename[strlen(name) + 7];
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snprintf(filename, sizeof(filename), "%s.cache", name);
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FILE *f = fopen(filename, "r");
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if (!f)
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return;
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fscanf(f, "%"SCNu64, &r->cache_time);
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fclose(f);
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}
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static void add_provider(const char *name, const struct respondd_provider_info *provider) {
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ENTRY key = {
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.key = (char *)provider->request,
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.data = NULL,
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};
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ENTRY *entry;
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if (!hsearch_r(key, FIND, &entry, &htab)) {
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struct request_type *r = malloc(sizeof(*r));
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r->providers = NULL;
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load_cache_time(r, provider->request);
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key.data = r;
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if (!hsearch_r(key, ENTER, &entry, &htab)) {
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perror("hsearch_r");
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exit(EXIT_FAILURE);
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}
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}
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struct request_type *r = entry->data;
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struct provider_list *pentry = malloc(sizeof(*pentry));
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pentry->name = strdup(name);
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pentry->provider = provider->provider;
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struct provider_list **pos;
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for (pos = &r->providers; *pos; pos = &(*pos)->next) {
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if (strcmp(pentry->name, (*pos)->name) < 0)
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break;
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}
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pentry->next = *pos;
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*pos = pentry;
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}
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static void load_providers(void) {
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update_time();
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/* Maximum number of request types, might be made configurable in the future */
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if (!hcreate_r(32, &htab)) {
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perror("hcreate_r");
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exit(EXIT_FAILURE);
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}
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DIR *dir = opendir(".");
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if (!dir) {
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perror("opendir");
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exit(EXIT_FAILURE);
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}
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struct dirent *ent;
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while ((ent = readdir(dir)) != NULL) {
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if (ent->d_name[0] == '.')
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continue;
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size_t len = strlen(ent->d_name);
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if (len < 4)
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continue;
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if (strcmp(&ent->d_name[len-3], ".so"))
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continue;
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const struct respondd_provider_info *providers = get_providers(ent->d_name);
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if (!providers)
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continue;
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for (; providers->request; providers++)
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add_provider(ent->d_name, providers);
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}
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closedir(dir);
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}
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static struct json_object * eval_providers(struct provider_list *providers) {
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struct json_object *ret = json_object_new_object();
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for (; providers; providers = providers->next)
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ret = merge_json(providers->provider(), ret);
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return ret;
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}
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static struct json_object * single_request(char *type) {
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ENTRY key = {
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.key = type,
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.data = NULL,
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};
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ENTRY *entry;
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if (!hsearch_r(key, FIND, &entry, &htab))
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return NULL;
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struct request_type *r = entry->data;
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if (r->cache_time && now < r->cache_timeout)
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return json_object_get(r->cache);
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struct json_object *ret = eval_providers(r->providers);
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if (r->cache_time) {
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if (r->cache)
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json_object_put(r->cache);
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r->cache = json_object_get(ret);
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r->cache_timeout = now + r->cache_time;
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}
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return ret;
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}
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static struct json_object * multi_request(char *types) {
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struct json_object *ret = json_object_new_object();
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char *type, *saveptr;
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for (type = strtok_r(types, " ", &saveptr); type; type = strtok_r(NULL, " ", &saveptr)) {
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struct json_object *sub = single_request(type);
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if (sub)
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json_object_object_add(ret, type, sub);
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}
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return ret;
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}
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static struct json_object * handle_request(char *request, bool *compress) {
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if (!*request)
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return NULL;
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update_time();
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if (!strncmp(request, "GET ", 4)) {
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*compress = true;
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return multi_request(request+4);
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}
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else {
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*compress = false;
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return single_request(request);
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}
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}
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static void serve(int sock) {
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char input[256];
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const char *output = NULL;
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ssize_t input_bytes, output_bytes;
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struct sockaddr_in6 addr;
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socklen_t addrlen = sizeof(addr);
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bool compress;
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input_bytes = recvfrom(sock, input, sizeof(input)-1, 0, (struct sockaddr *)&addr, &addrlen);
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if (input_bytes < 0) {
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perror("recvfrom failed");
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exit(EXIT_FAILURE);
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}
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input[input_bytes] = 0;
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struct json_object *result = handle_request(input, &compress);
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if (!result)
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return;
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const char *str = json_object_to_json_string_ext(result, JSON_C_TO_STRING_PLAIN);
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if (compress) {
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size_t str_bytes = strlen(str);
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mz_ulong compressed_bytes = mz_compressBound(str_bytes);
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unsigned char *compressed = alloca(compressed_bytes);
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if (!mz_compress(compressed, &compressed_bytes, (const unsigned char *)str, str_bytes)) {
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output = (const char*)compressed;
|
||||
output_bytes = compressed_bytes;
|
||||
}
|
||||
}
|
||||
else {
|
||||
output = str;
|
||||
output_bytes = strlen(str);
|
||||
}
|
||||
|
||||
if (output) {
|
||||
if (sendto(sock, output, output_bytes, 0, (struct sockaddr *)&addr, addrlen) < 0)
|
||||
perror("sendto failed");
|
||||
}
|
||||
|
||||
json_object_put(result);
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
int sock;
|
||||
struct sockaddr_in6 server_addr = {};
|
||||
struct in6_addr mgroup_addr;
|
||||
const char *command = NULL;
|
||||
int sock;
|
||||
struct sockaddr_in6 server_addr = {};
|
||||
struct in6_addr mgroup_addr;
|
||||
|
||||
sock = socket(PF_INET6, SOCK_DGRAM, 0);
|
||||
sock = socket(PF_INET6, SOCK_DGRAM, 0);
|
||||
|
||||
if (sock < 0) {
|
||||
perror("creating socket");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
if (sock < 0) {
|
||||
perror("creating socket");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
server_addr.sin6_family = AF_INET6;
|
||||
server_addr.sin6_addr = in6addr_any;
|
||||
server_addr.sin6_family = AF_INET6;
|
||||
server_addr.sin6_addr = in6addr_any;
|
||||
|
||||
opterr = 0;
|
||||
opterr = 0;
|
||||
|
||||
int group_set = 0;
|
||||
int group_set = 0;
|
||||
|
||||
int c;
|
||||
while ((c = getopt(argc, argv, "p:g:i:c:h")) != -1) {
|
||||
switch (c) {
|
||||
case 'p':
|
||||
server_addr.sin6_port = htons(atoi(optarg));
|
||||
break;
|
||||
int c;
|
||||
while ((c = getopt(argc, argv, "p:g:i:d:h")) != -1) {
|
||||
switch (c) {
|
||||
case 'p':
|
||||
server_addr.sin6_port = htons(atoi(optarg));
|
||||
break;
|
||||
|
||||
case 'g':
|
||||
if (!inet_pton(AF_INET6, optarg, &mgroup_addr)) {
|
||||
perror("Invalid multicast group. This message will probably confuse you");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
case 'g':
|
||||
if (!inet_pton(AF_INET6, optarg, &mgroup_addr)) {
|
||||
perror("Invalid multicast group. This message will probably confuse you");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
group_set = 1;
|
||||
break;
|
||||
group_set = 1;
|
||||
break;
|
||||
|
||||
case 'i':
|
||||
if (!group_set) {
|
||||
fprintf(stderr, "Multicast group must be given before interface.\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
join_mcast(sock, mgroup_addr, optarg);
|
||||
break;
|
||||
case 'i':
|
||||
if (!group_set) {
|
||||
fprintf(stderr, "Multicast group must be given before interface.\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
join_mcast(sock, mgroup_addr, optarg);
|
||||
break;
|
||||
|
||||
case 'c':
|
||||
command = optarg;
|
||||
break;
|
||||
case 'd':
|
||||
if (chdir(optarg)) {
|
||||
perror("Unable to change to given directory");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
break;
|
||||
|
||||
case 'h':
|
||||
usage();
|
||||
exit(EXIT_SUCCESS);
|
||||
break;
|
||||
case 'h':
|
||||
usage();
|
||||
exit(EXIT_SUCCESS);
|
||||
break;
|
||||
|
||||
default:
|
||||
fprintf(stderr, "Invalid parameter %c ignored.\n", c);
|
||||
}
|
||||
}
|
||||
default:
|
||||
fprintf(stderr, "Invalid parameter -%c ignored.\n", optopt);
|
||||
}
|
||||
}
|
||||
|
||||
if (!command) {
|
||||
fprintf(stderr, "No command given.\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
|
||||
perror("bind failed");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
|
||||
perror("bind failed");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
load_providers();
|
||||
|
||||
lua_State *L = luaL_newstate();
|
||||
luaL_openlibs(L);
|
||||
while (true)
|
||||
serve(sock);
|
||||
|
||||
if (luaL_loadstring(L, command)) {
|
||||
perror("Unable to load Lua command");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
lua_call(L, 0, 1);
|
||||
|
||||
while (1)
|
||||
serve(L, sock);
|
||||
|
||||
return EXIT_FAILURE;
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
|
|
@ -0,0 +1,39 @@
|
|||
/*
|
||||
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.
|
||||
*/
|
||||
|
||||
|
||||
#ifndef _RESPONDD_H_
|
||||
#define _RESPONDD_H_
|
||||
|
||||
typedef struct json_object * (*respondd_provider)(void);
|
||||
|
||||
struct respondd_provider_info {
|
||||
const char *request;
|
||||
const respondd_provider provider;
|
||||
};
|
||||
|
||||
extern const struct respondd_provider_info respondd_providers[];
|
||||
|
||||
#endif /* _RESPONDD_H_ */
|
Loading…
Reference in New Issue