From 3283d681f9da65b500ad0cb3d4550cb840ed481a Mon Sep 17 00:00:00 2001 From: John Crispin Date: Mon, 1 Jul 2013 18:34:13 +0200 Subject: add trigger support Signed-off-by: John Crispin --- trigger.c | 334 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 334 insertions(+) create mode 100644 trigger.c (limited to 'trigger.c') diff --git a/trigger.c b/trigger.c new file mode 100644 index 0000000..fff1855 --- /dev/null +++ b/trigger.c @@ -0,0 +1,334 @@ +/* + * Copyright (C) 2013 Felix Fietkau + * Copyright (C) 2013 John Crispin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * 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. + */ + +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "procd.h" + +struct trigger { + struct list_head list; + + char *type; + + int pending; + int remove; + int timeout; + + void *id; + + struct blob_attr *rule; + struct blob_attr *data; + struct uloop_timeout delay; + + struct json_script_ctx jctx; +}; + +struct job; +struct cmd { + char *name; + void (*handler)(struct job *job, struct blob_attr *exec, struct blob_attr *env); +}; + +struct job { + struct runqueue_process proc; + struct cmd *cmd; + struct trigger *trigger; + struct blob_attr *exec; + struct blob_attr *env; +}; + +static LIST_HEAD(triggers); +static struct runqueue q; + +static const char* rule_handle_var(struct json_script_ctx *ctx, const char *name, struct blob_attr *vars) +{ + return NULL; +} + +static struct json_script_file * +rule_load_script(struct json_script_ctx *ctx, const char *name) +{ + struct trigger *t = container_of(ctx, struct trigger, jctx); + + return json_script_file_from_blobmsg(t->type, t->rule, blob_pad_len(t->rule)); +} + +static void q_job_run(struct runqueue *q, struct runqueue_task *t) +{ + struct job *j = container_of(t, struct job, proc.task); + + LOG("handle event %s\n", j->cmd->name); + j->cmd->handler(j, j->exec, j->env); +} + +static void q_job_complete(struct runqueue *q, struct runqueue_task *p) +{ + struct job *j = container_of(p, struct job, proc.task); + + if (j->trigger->remove) { + list_del(&j->trigger->list); + free(&j->trigger); + } else { + j->trigger->pending = 0; + } + free(j); +} + +static void add_job(struct trigger *t, struct cmd *cmd, struct blob_attr *exec, struct blob_attr *data) +{ + static const struct runqueue_task_type job_type = { + .run = q_job_run, + .cancel = runqueue_process_cancel_cb, + .kill = runqueue_process_kill_cb, + }; + struct blob_attr *d, *e; + struct job *j = calloc_a(sizeof(*j), &e, blob_pad_len(exec), &d, blob_pad_len(data)); + + j->env = d; + j->exec = e; + j->cmd = cmd; + j->trigger = t; + j->proc.task.type = &job_type; + j->proc.task.complete = q_job_complete; + t->pending = 1; + + memcpy(j->exec, exec, blob_pad_len(exec)); + memcpy(j->env, data, blob_pad_len(data)); + + runqueue_task_add(&q, &j->proc.task, false); +} + +static void _setenv(const char *key, const char *val) +{ + char _key[32]; + + snprintf(_key, sizeof(_key), "PARAM_%s", key); + setenv(_key, val, 1); +} + +static void handle_run_script(struct job *j, struct blob_attr *exec, struct blob_attr *env) +{ + char *argv[8]; + struct blob_attr *cur; + int rem; + int i = 0; + pid_t pid; + + pid = fork(); + if (pid < 0) + return; + + if (pid) { + runqueue_process_add(&q, &j->proc, pid); + return; + } + + if (debug < 2) { + close(STDIN_FILENO); + close(STDOUT_FILENO); + close(STDERR_FILENO); + } + + _setenv("type", j->trigger->type); + blobmsg_for_each_attr(cur, j->env, rem) + _setenv(blobmsg_name(cur), blobmsg_data(cur)); + + blobmsg_for_each_attr(cur, j->exec, rem) { + argv[i] = blobmsg_data(cur); + i++; + if (i == 7) + break; + } + + if (i > 0) { + argv[i] = NULL; + execvp(argv[0], &argv[0]); + } + + exit(1); +} + +static struct cmd handlers[] = { + { + .name = "run_script", + .handler = handle_run_script, + }, +}; + +static void rule_handle_command(struct json_script_ctx *ctx, const char *name, + struct blob_attr *exec, struct blob_attr *vars) +{ + struct trigger *t = container_of(ctx, struct trigger, jctx); + int i; + + if (t->pending) + return; + + for (i = 0; i < ARRAY_SIZE(handlers); i++) { + if (!strcmp(handlers[i].name, name)) { + add_job(t, &handlers[i], exec, vars); + break; + } + } +} + +static void rule_handle_error(struct json_script_ctx *ctx, const char *msg, + struct blob_attr *context) +{ + char *s; + + s = blobmsg_format_json(context, false); + ERROR("ERROR: %s in block: %s\n", msg, s); + free(s); +} + +static void q_empty(struct runqueue *q) +{ +} + +static void trigger_delay_cb(struct uloop_timeout *tout) +{ + struct trigger *t = container_of(tout, struct trigger, delay); + + json_script_run(&t->jctx, "foo", t->data); + free(t->data); +} + +static struct trigger* _trigger_add(char *type, struct blob_attr *rule, int timeout, void *id) +{ + char *_t; + struct blob_attr *_r; + struct trigger *t = calloc_a(sizeof(*t), &_t, strlen(type) + 1, &_r, blob_pad_len(rule)); + + t->type = _t; + t->rule = _r; + t->delay.cb = trigger_delay_cb; + t->timeout = timeout; + t->pending = 0; + t->remove = 0; + t->id = id; + t->jctx.handle_var = rule_handle_var, + t->jctx.handle_error = rule_handle_error, + t->jctx.handle_command = rule_handle_command, + t->jctx.handle_file = rule_load_script, + + strcpy(t->type, type); + memcpy(t->rule, rule, blob_pad_len(rule)); + + list_add(&t->list, &triggers); + json_script_init(&t->jctx); + + return t; +} + +void trigger_add(struct blob_attr *rule, void *id) +{ + struct blob_attr *cur; + int rem; + + blobmsg_for_each_attr(cur, rule, rem) { + struct blob_attr *_cur, *type = NULL, *script = NULL, *timeout = NULL; + int _rem; + int i = 0; + + if (blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY) + continue; + + blobmsg_for_each_attr(_cur, cur, _rem) { + switch (i++) { + case 0: + if (blobmsg_type(_cur) == BLOBMSG_TYPE_STRING) + type = _cur; + break; + + case 1: + if (blobmsg_type(_cur) == BLOBMSG_TYPE_ARRAY) + script = _cur; + break; + + case 2: + if (blobmsg_type(_cur) == BLOBMSG_TYPE_INT32) + timeout = _cur; + break; + } + } + + if (type && script) { + int t = 0; + + if (timeout) + t = blobmsg_get_u32(timeout); + _trigger_add(blobmsg_get_string(type), script, t, id); + } + } +} + +void trigger_del(void *id) +{ + struct trigger *t, *n; + + list_for_each_entry_safe(t, n, &triggers, list) { + if (t->id != id) + continue; + + if (t->pending) { + t->remove = 1; + continue; + } + list_del(&t->list); + free(t); + } +} + +void trigger_init(void) +{ + runqueue_init(&q); + q.empty_cb = q_empty; + q.max_running_tasks = 1; +} + +void trigger_event(char *type, struct blob_attr *data) +{ + struct trigger *t; + + list_for_each_entry(t, &triggers, list) { + if (t->pending || t->remove) + continue; + if (!strcmp(t->type, type)) { + if (t->timeout) { + t->data = malloc(blob_pad_len(data)); + memcpy(t->data, data, blob_pad_len(data)); + uloop_timeout_set(&t->delay, t->timeout); + } else { + json_script_run(&t->jctx, "foo", data); + } + } + } +} -- cgit v1.2.3