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/*
alsajson-gw -- provide a REST/HTTP interface to ALSA-Mixer
Copyright (C) 2015, Fulup Ar Foll
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <time.h>
#include <json.h>
#include <microhttpd.h>
#include <magic.h>
#include <setjmp.h>
#include <signal.h>
#include <uuid/uuid.h>
#define AJQ_VERSION "0.1"
/* other definitions --------------------------------------------------- */
// Note: because of a bug in libmagic MAGIC_DB NULL should not be used for default
#define MAGIC_DB "/usr/share/misc/magic.mgc"
#define OPA_INDEX "index.html"
#define MAX_ALIAS 10 // max number of aliases
#define COOKIE_NAME "AJB_session"
#define DEFLT_CNTX_TIMEOUT 3600 // default Client Connection Timeout
#define DEFLT_API_TIMEOUT 0 // default Plugin API Timeout [0=NoLimit for Debug Only]
#define DEFLT_API_TIMEOUT 0 // default Plugin API Timeout
#define DEFLT_CACHE_TIMEOUT 100000 // default Static File Chache [Client Side Cache 100000~=1day]
#define DEFLT_AUTH_TOKEN NULL // expect for debug should == NULL
#define DEFLT_HTTP_TIMEOUT 15 // Max MibMicroHttp timeout
typedef int BOOL;
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#define PUBLIC
#define STATIC static
#define FAILED -1
extern int verbose; // this is the only global variable
// Plugin Type
typedef enum {AFB_PLUGIN_JSON=123456789, AFB_PLUGIN_JSCRIPT=987654321, AFB_PLUGIN_RAW=987123546} AFB_pluginE;
// prebuild json error are constructed in config.c
typedef enum { AFB_FALSE, AFB_TRUE, AFB_FATAL, AFB_FAIL, AFB_WARNING, AFB_EMPTY, AFB_SUCCESS, AFB_DONE, AFB_UNAUTH} AFB_error;
extern char *ERROR_LABEL[];
#define ERROR_LABEL_DEF {"false", "true","fatal", "fail", "warning", "empty", "success"}
#define BANNER "<html><head><title>Application Framework Binder</title></head><body>Application Framework </body></html>"
#define JSON_CONTENT "application/json"
#define FORM_CONTENT "multipart/form-data"
#define MAX_POST_SIZE 4096 // maximum size for POST data
#define CTX_NBCLIENTS 10 // allow a default of 10 authenticated clients
typedef json_object* (*AFB_apiCB)();
// Error code are requested through function to manage json usage count
typedef struct {
int level;
char* label;
json_object *json;
} AFB_errorT;
typedef enum {AFB_POST_NONE=0, AFB_POST_JSON, AFB_POST_FORM} AFB_PostType;
typedef struct {
int len; // post element size
char *data; // post data in raw format
AFB_PostType type; // Json type
} AFB_PostRequest;
// Post handler
typedef struct {
void* ctx; // Application context
int len; // current len for post
int uid; // post uid for debug
AFB_PostType type; // JSON or FORM
AFB_apiCB completeCB; // callback when post is completed
char *private; // use internally to keep track or partial buffer
struct MHD_PostProcessor *pp; // iterator handle
} AFB_PostHandle;
typedef struct {
enum MHD_ValueKind kind; // kind type of the value
const char *key; // key 0-terminated key for the value
const char *filename; // filename of the uploaded file, NULL if not known
const char *mimetype; // content_type mime-type of the data, NULL if not known
const char *encoding; // transfer_encoding encoding of the data, NULL if not known
const char *data; // data pointer to size bytes of data at the specified offset
uint64_t offset; // offset of data in the overall value
size_t len; // number of bytes in data available
} AFB_PostItem;
typedef struct {
char path[512];
int fd;
} AFB_staticfile;
typedef struct {
char *url;
char *path;
size_t len;
} AFB_aliasdir;
// Command line structure hold cli --command + help text
typedef struct {
int val; // command number within application
int has_arg; // command number within application
char *name; // command as used in --xxxx cli
char *help; // help text
} AFB_options;
// main config structure
typedef struct {
char *logname; // logfile path for info & error log
char *console; // console device name (can be a file or a tty)
int localhostOnly;
int httpdPort;
char *smack; // smack label
char *plugins; // list of requested plugins
char *rootdir; // base dir for httpd file download
char *rootbase; // Angular HTML5 base URL
char *rootapi; // Base URL for REST APIs
char *pidfile; // where to store pid when running background
char *sessiondir; // where to store mixer session files
char *configfile; // where to store configuration on gateway exit
char *setuid; // downgrade uid to username
char *token; // initial authentication token [default NULL no session]
int cacheTimeout;
int apiTimeout;
int cntxTimeout; // Client Session Context timeout
AFB_aliasdir *aliasdir; // alias mapping for icons,apps,...
} AFB_config;
typedef struct {
int len; // command number within application
json_object *jtype;
} AFB_privateApi;
typedef struct {
char *msg;
size_t len;
} AFB_redirect_msg;
// Enum for Session/Token/Authentication middleware
typedef enum {AFB_SESSION_NONE, AFB_SESSION_CREATE, AFB_SESSION_CLOSE, AFB_SESSION_RENEW, AFB_SESSION_CHECK} AFB_sessionE;
// API definition
typedef struct {
char *name;
AFB_sessionE session;
AFB_apiCB callback;
char *info;
AFB_privateApi *private;
} AFB_restapi;
// Plugin definition
typedef struct {
AFB_pluginE type;
char *info;
char *prefix;
size_t prefixlen;
json_object *jtype;
AFB_restapi *apis;
void *handle;
int ctxCount;
AFB_apiCB freeCtxCB; // callback to free application context [null for standard free]
} AFB_plugin;
// User Client Session Context
typedef struct {
int cid; // index 0 if global
char uuid[37]; // long term authentication of remote client
char token[37]; // short term authentication of remote client
time_t timeStamp; // last time token was refresh
int restfull; // client does not use cookie
void *ctx; // application specific context
AFB_plugin *plugin; // provide callback and easy access to plugin
} AFB_clientCtx;
// MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "value");
typedef struct {
const char *url;
char *plugin;
char *api;
AFB_PostRequest *post;
json_object *jresp;
AFB_clientCtx *client; // needed because libmicrohttp cannot create an empty response
int restfull; // request is resfull [uuid token provided]
int errcode; // http error code
sigjmp_buf checkPluginCall; // context save for timeout set/longjmp
AFB_config *config; // plugin may need access to config
struct MHD_Connection *connection;
AFB_plugin **plugins;
} AFB_request;
typedef struct {
AFB_config *config; // pointer to current config
// List of commands to execute
int killPrevious;
int background; // run in backround mode
int foreground; // run in forground mode
int configsave; // Save config on disk on start
char *cacheTimeout; // http require timeout to be a string
void *httpd; // anonymous structure for httpd handler
int fakemod; // respond to GET/POST request without interacting with sndboard
int forceexit; // when autoconfig from script force exit before starting server
AFB_plugin **plugins; // pointer to REST/API plugins
magic_t magic; // Mime type file magic lib
sigjmp_buf restartCkpt; // context save for restart set/longjmp
} AFB_session;
#include "proto-def.h"
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