diff options
Diffstat (limited to 'hook-plugin/PolicyHookTcp.c')
| -rw-r--r-- | hook-plugin/PolicyHookTcp.c | 560 |
1 files changed, 0 insertions, 560 deletions
diff --git a/hook-plugin/PolicyHookTcp.c b/hook-plugin/PolicyHookTcp.c deleted file mode 100644 index c4b7c15..0000000 --- a/hook-plugin/PolicyHookTcp.c +++ /dev/null @@ -1,560 +0,0 @@ -/* - * Copyright (C) 2016 "IoT.bzh" - * Author Fulup Ar Foll <fulup@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. - * - * AfbCallBack (snd_ctl_hal_t *handle, int numid, void **response); - * AlsaHookInit is mandatory and called with numid=0 - * - * Syntax in .asoundrc file - * CrlLabel { cb MyFunctionName name "My_Second_Control" } - * - * Testing: - * aplay -DAlsaHook /usr/share/sounds/alsa/test.wav - * - * References: - * https://www.spinics.net/lists/alsa-devel/msg54235.html - * https://github.com/shivdasgujare/utilities/blob/master/nexuss/alsa-scenario-hook/src/alsa-wrapper.c - */ - -#define _GNU_SOURCE -#include <stdio.h> -#include <alsa/asoundlib.h> -#include <alsa/conf.h> -#include <alsa/pcm.h> - -#include <systemd/sd-event.h> -#include <json-c/json.h> - -#include "afb/afb-wsj1.h" -#include "afb/afb-ws-client.h" -#include <pthread.h> -#include <semaphore.h> - - -#define PLUGIN_ENTRY_POINT AlsaInstallHook - // Fulup Note: What ever you may find on Internet you should use - // SND_CONFIG_DLSYM_VERSION_HOOK and not SND_CONFIG_DLSYM_VERSION_HOOK - SND_DLSYM_BUILD_VERSION(PLUGIN_ENTRY_POINT, SND_PCM_DLSYM_VERSION) - -// this should be more than enough -#define MAX_API_CALL 10 -#define MAX_EVT_CALL 10 - -// timeout in ms -#define REQUEST_DEFAULT_TIMEOUT 500 -#ifndef MAINLOOP_WATCHDOG -#define MAINLOOP_WATCHDOG 100000 -#endif - -// closing message is added to query when PCM is closed -#define CLOSING_MSG ",\"source\":-1}" - -// Currently not implemented -#define UNUSED_ARG(x) UNUSED_ ## x __attribute__((__unused__)) -void OnRequestCB(void* UNUSED_ARG(handle) , const char* UNUSED_ARG(api), const char* UNUSED_ARG(verb), struct afb_wsj1_msg*UNUSED_ARG(msg)) {} - -typedef struct { - const char *api; - const char *openVerb; - const char *closeVerb; - long timeout; - char *query; - size_t length; - - sd_event_source *evtSource; - char *callIdTag; - void *afbClient; -} afbRequestT; - -typedef struct { - const char *name; - int signal; -} afbEventT; - -typedef struct { - snd_pcm_t *pcm; - const char *uri; - struct afb_wsj1 *wsj1; - sd_event *sdLoop; - int verbose; - sem_t semaphore; - int count; - int error; - afbRequestT **request; - afbEventT **event; -} afbClientT; - - - -static void *LoopInThread(void *handle) { - afbClientT *afbClient = (afbClientT*) handle; - int count=0; - int watchdog= MAINLOOP_WATCHDOG *1000; - - /* loop until end */ - for (;;) { - - if (afbClient->verbose) printf("ON-MAINLOOP ping=%d\n", count++); - sd_event_run(afbClient->sdLoop, watchdog); - } - - return NULL; -} - -// lost connect with the AudioDaemon -static void OnHangupCB(void *handle, struct afb_wsj1 *wsj1) { - - afbClientT *afbClient = (afbClientT*) handle; - SNDERR("(Hoops) Lost Connection to %s", afbClient->uri); - - // try to close PCM when impossible terminate client - int err = snd_pcm_close (afbClient->pcm); - if (err) exit(1); -} - -typedef enum { - HOOK_INSTALL, - HOOK_CLOSE, -} hookActionT; - - -void OnEventCB(void *handle, const char *event, struct afb_wsj1_msg *msg) { - afbClientT *afbClient = (afbClientT*) handle; - afbEventT **afbEvent = afbClient->event; - json_object *eventJ, *tmpJ, *dataJ; - const char *label; - int value, done, index; - - eventJ = afb_wsj1_msg_object_j(msg); - done= json_object_object_get_ex(eventJ,"data", &dataJ); - if (!done) { - SNDERR ("PCM_HOOK: uri=%s empty event label", afbClient->uri); - goto OnErrorExit; - } - - json_object_object_get_ex(dataJ,"signal", &tmpJ); - label=json_object_get_string(tmpJ); - - json_object_object_get_ex(dataJ,"value", &tmpJ); - value=json_object_get_int(tmpJ); - - for (index=0; afbEvent[index]!= NULL; index++) { - if (!strcmp(afbEvent[index]->name, label)) break; - } - - if (!afbEvent[index] || !afbEvent[index]->signal) { - SNDERR ("PCM_HOOK: Unsupported uri=%s label=%s", afbClient->uri, label); - return; - } - - // send signal to self process - kill (getpid(), afbEvent[index]->signal); - - if (afbClient->verbose) printf("ON-EVENT label=%s signal=%d\n", label, value); - return; - -OnErrorExit: - SNDERR("ON-EVENT %s(%s)\n", event, afb_wsj1_msg_object_s(msg)); - return; -} - -// callback interface for wsj1 -static struct afb_wsj1_itf itf = { - .on_hangup = OnHangupCB, - .on_call = OnRequestCB, - .on_event = OnEventCB -}; - -void OnResponseCB(void *handle, struct afb_wsj1_msg *msg) { - afbRequestT *afbRequest= (afbRequestT*)handle; - afbClientT *afbClient=(afbClientT*)afbRequest->afbClient; - - if (afbClient->verbose) printf("ON-RESPONSE call=%s response=%s\n", afbRequest->callIdTag, afb_wsj1_msg_object_s(msg)); - - // Cancel timeout for this request - sd_event_source_unref(afbRequest->evtSource); - - if (! afb_wsj1_msg_is_reply_ok(msg)) goto OnErrorExit; - - // When not more waiting call release semaphore - afbClient->count--; - if (afbClient->count == 0) { - if (afbClient->verbose) printf("ON-RESPONSE No More Waiting Request\n"); - afbClient->error=0; - sem_post (&afbClient->semaphore); - } - return; - -OnErrorExit: - fprintf(stderr, "ON-RESPONSE ERROR call=%s response=%s\n", afbRequest->callIdTag, afb_wsj1_msg_object_s(msg)); - afbClient->error=1; - sem_post (&afbClient->semaphore); -} - -int OnTimeoutCB (sd_event_source* source, uint64_t timer, void* handle) { - afbClientT *afbClient= (afbClientT*)handle; - - SNDERR("\nON-TIMEOUT Call Request Fail URI=%s\n", afbClient->uri); - - // Close PCM and release waiting client - afbClient->error=1; - sem_post (&afbClient->semaphore); - - return 0; -} - -// Call AGL binder asynchronously by with a timeout -static int CallWithTimeout(afbClientT *afbClient, afbRequestT *afbRequest, int count, hookActionT action) { - uint64_t usec; - const char * apiVerb; - int err; - - // create a unique tag for request - (void) asprintf(&afbRequest->callIdTag, "%d:%s/%s", count, afbRequest->api, afbRequest->openVerb); - - // create a timer with ~250us accuracy - sd_event_now(afbClient->sdLoop, CLOCK_MONOTONIC, &usec); - sd_event_add_time(afbClient->sdLoop, &afbRequest->evtSource, CLOCK_MONOTONIC, usec+afbRequest->timeout*1000, 250, OnTimeoutCB, afbClient); - - - // on PCM close replace last '}' by CLOSING_MSG - if (action == HOOK_CLOSE) apiVerb= afbRequest->closeVerb; - else apiVerb= afbRequest->openVerb; - - // release action is optional - if (apiVerb) { - if (afbClient->verbose) printf("CALL-REQUEST api=%s/%s tag=%s\n", afbRequest->api, apiVerb, afbRequest->callIdTag); - err = afb_wsj1_call_s(afbClient->wsj1, afbRequest->api, apiVerb, afbRequest->query, OnResponseCB, afbRequest); - if (err) goto OnErrorExit; - } - // save client handle in request - afbRequest->afbClient = afbClient; - afbClient->count ++; - - return 0; - -OnErrorExit: - fprintf(stderr, "LaunchCallRequest: Fail call %s//%s/%s&%s", afbClient->uri, afbRequest->api, apiVerb, afbRequest->query); - return 1; -} - -static int LaunchCallRequest(afbClientT *afbClient, hookActionT action) { - - pthread_t tid; - int err, idx; - afbRequestT **afbRequest= afbClient->request; - - if (action == HOOK_INSTALL) { - // init waiting counting semaphore - if (sem_init(&afbClient->semaphore, 1, 0) == -1) { - fprintf(stderr, "LaunchCallRequest: Fail Semaphore Init: %s\n", afbClient->uri); - } - - // Create a main loop - err = sd_event_default(&afbClient->sdLoop); - if (err < 0) { - fprintf(stderr, "LaunchCallRequest: Connection to default event loop failed: %s\n", strerror(-err)); - goto OnErrorExit; - } - - // start a thread with a mainloop to monitor Audio-Agent - err = pthread_create(&tid, NULL, &LoopInThread, afbClient); - if (err) goto OnErrorExit; - - // connect the websocket wsj1 to the uri given by the first argument - afbClient->wsj1 = afb_ws_client_connect_wsj1(afbClient->sdLoop, afbClient->uri, &itf, afbClient); - if (afbClient->wsj1 == NULL) { - fprintf(stderr, "LaunchCallRequest: Connection to %s failed\n", afbClient->uri); - goto OnErrorExit; - } - } - - // send call request to audio-agent asynchronously (respond with thread mainloop context) - for (idx = 0; afbRequest[idx] != NULL; idx++) { - err = CallWithTimeout(afbClient, afbRequest[idx], idx, action); - if (err) goto OnErrorExit; - } - - // launch counter to keep track of waiting request call - afbClient->count=idx; - - return 0; - -OnErrorExit: - return -1; -} - -static int AlsaCloseHook(snd_pcm_hook_t *hook) { - - afbClientT *afbClient = (afbClientT*) snd_pcm_hook_get_private (hook); - - // launch call request and create a waiting mainloop thread - int err = LaunchCallRequest(afbClient, HOOK_CLOSE); - if (err < 0) { - fprintf (stderr, "PCM Fail to Enter Mainloop\n"); - goto OnErrorExit; - } - - // wait for all call request to return - sem_wait(&afbClient->semaphore); - if (afbClient->error) { - fprintf (stderr, "AlsaCloseHook: Notice exit before audio-4a response\n"); - goto OnErrorExit; - } - - if (afbClient->verbose) fprintf(stdout, "\nAlsaHook Close Success PCM=%s URI=%s\n", snd_pcm_name(afbClient->pcm), afbClient->uri); - return 0; - -OnErrorExit: - fprintf(stderr, "\nAlsaPcmHook Plugin Close Fail PCM=%s\n", snd_pcm_name(afbClient->pcm)); - return 0; -} - -// Function call when Plugin PCM is OPEN -int PLUGIN_ENTRY_POINT (snd_pcm_t *pcm, snd_config_t *conf) { - snd_pcm_hook_t *h_close = NULL; - snd_config_iterator_t it, next; - afbClientT *afbClient = malloc(sizeof (afbClientT)); - afbRequestT **afbRequest = malloc(MAX_API_CALL * sizeof(afbRequestT*)); - afbEventT **afbEvent= malloc(MAX_EVT_CALL * sizeof(afbEventT*)); - int err; - - // start populating client handle - afbClient->pcm = pcm; - afbClient->verbose = 0; - afbClient->request = afbRequest; - - // Get PCM arguments from asoundrc - snd_config_for_each(it, next, conf) { - snd_config_t *node = snd_config_iterator_entry(it); - const char *id; - - // ignore comment en empty lines - if (snd_config_get_id(node, &id) < 0) continue; - if (strcmp(id, "comment") == 0 || strcmp(id, "hint") == 0) continue; - - if (strcmp(id, "uri") == 0) { - const char *uri; - if (snd_config_get_string(node, &uri) < 0) { - SNDERR("Invalid String for %s", id); - goto OnErrorExit; - } - afbClient->uri=strdup(uri); - continue; - } - - if (strcmp(id, "verbose") == 0) { - afbClient->verbose= snd_config_get_bool(node); - if (afbClient->verbose < 0) { - SNDERR("Invalid Boolean for %s", id); - goto OnErrorExit; - } - continue; - } - - if (strcmp(id, "controls") == 0) { - const char *callConf, *callLabel; - snd_config_type_t ctype; - snd_config_iterator_t currentCall, follow; - snd_config_t *itemConf; - int callCount=0; - - ctype = snd_config_get_type(node); - if (ctype != SND_CONFIG_TYPE_COMPOUND) { - snd_config_get_string(node, &callConf); - SNDERR("Invalid compound type for %s", callConf); - goto OnErrorExit; - } - - - // loop on each call - snd_config_for_each(currentCall, follow, node) { - snd_config_t *ctlconfig = snd_config_iterator_entry(currentCall); - - // ignore empty line - if (snd_config_get_id(ctlconfig, &callLabel) < 0) continue; - - // each clt should be a valid config compound - ctype = snd_config_get_type(ctlconfig); - if (ctype != SND_CONFIG_TYPE_COMPOUND) { - snd_config_get_string(node, &callConf); - SNDERR("Invalid call element for %s value=%s", callLabel, callConf); - goto OnErrorExit; - } - - // allocate an empty call request - afbRequest[callCount] = calloc(1, sizeof (afbRequestT)); - - - err = snd_config_search(ctlconfig, "api", &itemConf); - if (!err) { - const char *api; - if (snd_config_get_string(itemConf, &api) < 0) { - SNDERR("Invalid api string for %s", callLabel); - goto OnErrorExit; - } - afbRequest[callCount]->api=strdup(api); - } - - err = snd_config_search(ctlconfig, "request", &itemConf); - if (!err) { - const char *verb; - if (snd_config_get_string(itemConf, &verb) < 0) { - SNDERR("Invalid open verb string %s", id); - goto OnErrorExit; - } - afbRequest[callCount]->openVerb=strdup(verb); - } - - err = snd_config_search(ctlconfig, "release", &itemConf); - if (!err) { - const char *verb; - if (snd_config_get_string(itemConf, &verb) < 0) { - SNDERR("Invalid close verb string %s", id); - goto OnErrorExit; - } - afbRequest[callCount]->closeVerb=strdup(verb); - } - - err = snd_config_search(ctlconfig, "timeout", &itemConf); - if (!err) { - if (snd_config_get_integer(itemConf, &afbRequest[callCount]->timeout) < 0) { - SNDERR("Invalid timeout Integer %s", id); - goto OnErrorExit; - } - } - - err = snd_config_search(ctlconfig, "args", &itemConf); - if (!err) { - const char *query; - if (snd_config_get_string(itemConf, &query) < 0) { - SNDERR("Invalid args string %s", id); - goto OnErrorExit; - } - // reserve enough space to ad closing message - afbRequest[callCount]->length= strlen(query); - afbRequest[callCount]->query = malloc (afbRequest[callCount]->length+strlen(CLOSING_MSG)+1); - strcpy (afbRequest[callCount]->query, query); - - // cleanup string for json_tokener - for (int idx = 0; query[idx] != '\0'; idx++) { - if (query[idx] == '\'') afbRequest[callCount]->query[idx] = '"'; - else afbRequest[callCount]->query[idx] = query[idx]; - } - json_object *queryJ = json_tokener_parse(afbRequest[callCount]->query); - if (!queryJ) { - SNDERR("Invalid Json %s args=%s should be args=\"{'tok1':'val1', 'tok2':'val2'}\" ", id, afbRequest[callCount]->query); - goto OnErrorExit; - } - } - - // Simple check on call request validity - if (!afbRequest[callCount]->query) afbRequest[callCount]->query= ""; - if (!afbRequest[callCount]->timeout) afbRequest[callCount]->timeout=REQUEST_DEFAULT_TIMEOUT ; - if (!afbRequest[callCount]->openVerb || !afbRequest[callCount]->api) { - SNDERR("Missing api/open(verb)/close(verb) %s in asoundrc", callLabel); - goto OnErrorExit; - } - - // move to next call if any - callCount ++; - if (callCount == MAX_API_CALL) { - SNDERR("Too Many call MAX_API_CALL=%d", MAX_API_CALL); - goto OnErrorExit; - } - afbRequest[callCount]=NULL; // afbRequest array is NULL terminated - - } - continue; - } - if (strcmp(id, "events") == 0) { - const char *callConf, *callLabel; - snd_config_type_t ctype; - snd_config_iterator_t currentCall, follow; - int callCount=0; - - ctype = snd_config_get_type(node); - if (ctype != SND_CONFIG_TYPE_COMPOUND) { - snd_config_get_string(node, &callConf); - SNDERR("Invalid compound type for %s", callConf); - goto OnErrorExit; - } - - - // loop on each call - snd_config_for_each(currentCall, follow, node) { - snd_config_t *ctlconfig = snd_config_iterator_entry(currentCall); - long sigval; - - // ignore empty line - if (snd_config_get_id(ctlconfig, &callLabel) < 0) continue; - - // each clt should be a valid config compound - ctype = snd_config_get_type(ctlconfig); - if (ctype != SND_CONFIG_TYPE_INTEGER) { - snd_config_get_string(ctlconfig, &callConf); - SNDERR("Invalid signal number for %s value=%s", callLabel, callConf); - goto OnErrorExit; - } - - // allocate an empty call request - snd_config_get_integer(ctlconfig, &sigval); - afbEvent[callCount] = calloc(1, sizeof (afbEventT)); - afbEvent[callCount]->name=strdup(callLabel); - afbEvent[callCount]->signal= (int)sigval; - - // move to next call if any - callCount ++; - if (callCount == MAX_EVT_CALL) { - SNDERR("Too Many call MAX_EVT_CALL=%d", MAX_EVT_CALL); - goto OnErrorExit; - } - afbEvent[callCount]=NULL; // afbEvent array is NULL terminated - - } - continue; - } - } - - if (afbClient->verbose) fprintf(stdout, "\nAlsaHook Install Start PCM=%s URI=%s\n", snd_pcm_name(afbClient->pcm), afbClient->uri); - - err = snd_pcm_hook_add(&h_close, afbClient->pcm, SND_PCM_HOOK_TYPE_CLOSE, AlsaCloseHook, afbClient); - if (err < 0) goto OnErrorExit; - - // launch call request and create a waiting mainloop thread - err = LaunchCallRequest(afbClient, HOOK_INSTALL); - if (err < 0) { - fprintf (stderr, "PCM Fail to Enter Mainloop\n"); - goto OnErrorExit; - } - - // wait for all call request to return - sem_wait(&afbClient->semaphore); - if (afbClient->error) { - fprintf (stderr, "PCM Authorisation Deny from AAAA Controller (AGL Advanced Audio Agent)\n"); - goto OnErrorExit; - } - - if (afbClient->verbose) fprintf(stdout, "\nAlsaHook Install Success PCM=%s URI=%s\n", snd_pcm_name(afbClient->pcm), afbClient->uri); - return 0; - -OnErrorExit: - fprintf(stderr, "\nAlsaPcmHook Plugin Install Fail PCM=%s\n", snd_pcm_name(pcm)); - if (h_close) - snd_pcm_hook_remove(h_close); - - return -EINVAL; -} - |