debloat and reorganize code

split app into procd and init binaries
remove log support, this is an external service now

Signed-off-by: John Crispin <blogic@openwrt.org>

1 files changed, 480 insertions, 0 deletions

diff --git a/service/instance.c b/service/instance.c
new file mode 100644
index 0000000..5ac7d57
--- /dev/null
+++ b/service/instance.c
@@ -0,0 +1,480 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * 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 <sys/resource.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+
+#include "../procd.h"
+
+#include "service.h"
+#include "instance.h"
+
+#include "../utils/md5.h"
+
+enum {
+	INSTANCE_ATTR_COMMAND,
+	INSTANCE_ATTR_ENV,
+	INSTANCE_ATTR_DATA,
+	INSTANCE_ATTR_NETDEV,
+	INSTANCE_ATTR_FILE,
+	INSTANCE_ATTR_TRIGGER,
+	INSTANCE_ATTR_RESPAWN,
+	INSTANCE_ATTR_NICE,
+	__INSTANCE_ATTR_MAX
+};
+
+static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
+	[INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
+	[INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
+	[INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
+	[INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
+	[INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
+	[INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
+	[INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
+	[INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
+};
+
+struct instance_netdev {
+	struct blobmsg_list_node node;
+	int ifindex;
+};
+
+struct instance_file {
+	struct blobmsg_list_node node;
+	uint32_t md5[4];
+};
+
+static void
+instance_run(struct service_instance *in)
+{
+	struct blobmsg_list_node *var;
+	struct blob_attr *cur;
+	char **argv;
+	int argc = 1; /* NULL terminated */
+	int rem, fd;
+
+	if (in->nice)
+		setpriority(PRIO_PROCESS, 0, in->nice);
+
+	blobmsg_for_each_attr(cur, in->command, rem)
+		argc++;
+
+	blobmsg_list_for_each(&in->env, var)
+		setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
+
+	argv = alloca(sizeof(char *) * argc);
+	argc = 0;
+
+	blobmsg_for_each_attr(cur, in->command, rem)
+		argv[argc++] = blobmsg_data(cur);
+
+	argv[argc] = NULL;
+	fd = open("/dev/null", O_RDWR);
+	if (fd > -1) {
+		dup2(fd, STDIN_FILENO);
+		dup2(fd, STDOUT_FILENO);
+		dup2(fd, STDERR_FILENO);
+		if (fd > STDERR_FILENO)
+			close(fd);
+	}
+	execvp(argv[0], argv);
+	exit(127);
+}
+
+void
+instance_start(struct service_instance *in)
+{
+	int pid;
+
+	if (in->proc.pending)
+		return;
+
+	in->restart = false;
+	in->halt = !in->respawn;
+
+	if (!in->valid)
+		return;
+
+	pid = fork();
+	if (pid < 0)
+		return;
+
+	if (!pid) {
+		uloop_done();
+		instance_run(in);
+		return;
+	}
+
+	DEBUG(2, "Started instance %s::%s\n", in->srv->name, in->name);
+	in->proc.pid = pid;
+	clock_gettime(CLOCK_MONOTONIC, &in->start);
+	uloop_process_add(&in->proc);
+}
+
+static void
+instance_timeout(struct uloop_timeout *t)
+{
+	struct service_instance *in;
+
+	in = container_of(t, struct service_instance, timeout);
+
+	if (!in->halt && (in->restart || in->respawn))
+		instance_start(in);
+}
+
+static void
+instance_exit(struct uloop_process *p, int ret)
+{
+	struct service_instance *in;
+	struct timespec tp;
+	long runtime;
+
+	in = container_of(p, struct service_instance, proc);
+
+	clock_gettime(CLOCK_MONOTONIC, &tp);
+	runtime = tp.tv_sec - in->start.tv_sec;
+
+	DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
+	if (upgrade_running)
+		return;
+
+	uloop_timeout_cancel(&in->timeout);
+	if (in->halt) {
+		/* no action */
+	} else if (in->restart) {
+		instance_start(in);
+	} else if (in->respawn) {
+		if (runtime < in->respawn_threshold)
+			in->respawn_count++;
+		else
+			in->respawn_count = 0;
+		if (in->respawn_count > in->respawn_retry) {
+			LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
+								in->srv->name, in->name, in->respawn_count, runtime);
+			in->restart = in->respawn = 0;
+			in->halt = 1;
+		} else {
+			uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
+		}
+	}
+}
+
+void
+instance_stop(struct service_instance *in)
+{
+	if (!in->proc.pending)
+		return;
+	in->halt = true;
+	in->restart = in->respawn = false;
+	kill(in->proc.pid, SIGTERM);
+}
+
+static void
+instance_restart(struct service_instance *in)
+{
+	if (!in->proc.pending)
+		return;
+	in->halt = false;
+	in->restart = true;
+	kill(in->proc.pid, SIGTERM);
+}
+
+static bool
+instance_config_changed(struct service_instance *in, struct service_instance *in_new)
+{
+	if (!in->valid)
+		return true;
+
+	if (!blob_attr_equal(in->command, in_new->command))
+		return true;
+
+	if (!blobmsg_list_equal(&in->env, &in_new->env))
+		return true;
+
+	if (!blobmsg_list_equal(&in->data, &in_new->data))
+		return true;
+
+	if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
+		return true;
+
+	if (!blobmsg_list_equal(&in->file, &in_new->file))
+		return true;
+
+	if (in->nice != in_new->nice)
+		return true;
+
+	return false;
+}
+
+static bool
+instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
+{
+	struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
+	struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
+
+	return n1->ifindex == n2->ifindex;
+}
+
+static void
+instance_netdev_update(struct blobmsg_list_node *l)
+{
+	struct instance_netdev *n = container_of(l, struct instance_netdev, node);
+
+	n->ifindex = if_nametoindex(n->node.avl.key);
+}
+
+static bool
+instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
+{
+	struct instance_file *f1 = container_of(l1, struct instance_file, node);
+	struct instance_file *f2 = container_of(l2, struct instance_file, node);
+
+	return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
+}
+
+static void
+instance_file_update(struct blobmsg_list_node *l)
+{
+	struct instance_file *f = container_of(l, struct instance_file, node);
+	md5_ctx_t md5;
+	char buf[256];
+	int len, fd;
+
+	memset(f->md5, 0, sizeof(f->md5));
+
+	fd = open(l->avl.key, O_RDONLY);
+	if (fd < 0)
+		return;
+
+	md5_begin(&md5);
+	do {
+		len = read(fd, buf, sizeof(buf));
+		if (len < 0) {
+			if (errno == EINTR)
+				continue;
+
+			break;
+		}
+		if (!len)
+			break;
+
+		md5_hash(buf, len, &md5);
+	} while(1);
+
+	md5_end(f->md5, &md5);
+	close(fd);
+}
+
+static bool
+instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
+{
+	struct blobmsg_list_node *node;
+
+	if (!cur)
+		return true;
+
+	if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
+		return false;
+
+	blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
+	if (cb) {
+		blobmsg_list_for_each(l, node)
+			cb(node);
+	}
+	return true;
+}
+
+static bool
+instance_config_parse(struct service_instance *in)
+{
+	struct blob_attr *tb[__INSTANCE_ATTR_MAX];
+	struct blob_attr *cur, *cur2;
+	int argc = 0;
+	int rem;
+
+	blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
+		blobmsg_data(in->config), blobmsg_data_len(in->config));
+
+	cur = tb[INSTANCE_ATTR_COMMAND];
+	if (!cur)
+		return false;
+
+	if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
+		return false;
+
+	blobmsg_for_each_attr(cur2, cur, rem) {
+		argc++;
+		break;
+	}
+	if (!argc)
+		return false;
+
+	in->command = cur;
+
+	if (tb[INSTANCE_ATTR_RESPAWN]) {
+		int i = 0;
+		uint32_t vals[3] = { 3600, 5, 5};
+
+		blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
+			if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
+				continue;
+			vals[i] = atoi(blobmsg_get_string(cur2));
+			i++;
+		}
+		in->respawn = true;
+		in->respawn_count = 0;
+		in->respawn_threshold = vals[0];
+		in->respawn_timeout = vals[1];
+		in->respawn_retry = vals[2];
+	}
+	if (tb[INSTANCE_ATTR_TRIGGER]) {
+		in->trigger = malloc(blob_pad_len(tb[INSTANCE_ATTR_TRIGGER]));
+		if (!in->trigger)
+			return -1;
+		memcpy(in->trigger, tb[INSTANCE_ATTR_TRIGGER], blob_pad_len(tb[INSTANCE_ATTR_TRIGGER]));
+		trigger_add(in->trigger, in);
+	}
+
+	if ((cur = tb[INSTANCE_ATTR_NICE])) {
+		in->nice = (int8_t) blobmsg_get_u32(cur);
+		if (in->nice < -20 || in->nice > 20)
+			return false;
+	}
+
+	if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
+		return false;
+
+	if (!instance_fill_array(&in->data, tb[INSTANCE_ATTR_DATA], NULL, false))
+		return false;
+
+	if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
+		return false;
+
+	if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
+		return false;
+
+	return true;
+}
+
+static void
+instance_config_cleanup(struct service_instance *in)
+{
+	blobmsg_list_free(&in->env);
+	blobmsg_list_free(&in->data);
+	blobmsg_list_free(&in->netdev);
+}
+
+static void
+instance_config_move(struct service_instance *in, struct service_instance *in_src)
+{
+	instance_config_cleanup(in);
+	blobmsg_list_move(&in->env, &in_src->env);
+	blobmsg_list_move(&in->data, &in_src->data);
+	blobmsg_list_move(&in->netdev, &in_src->netdev);
+	in->trigger = in_src->trigger;
+	in->command = in_src->command;
+	in->name = in_src->name;
+	in->node.avl.key = in_src->node.avl.key;
+
+	free(in->config);
+	in->config = in_src->config;
+	in_src->config = NULL;
+}
+
+bool
+instance_update(struct service_instance *in, struct service_instance *in_new)
+{
+	bool changed = instance_config_changed(in, in_new);
+	bool running = in->proc.pending;
+
+	if (!changed && running)
+		return false;
+
+	if (!running) {
+		if (changed)
+			instance_config_move(in, in_new);
+		instance_start(in);
+	} else {
+		instance_restart(in);
+		instance_config_move(in, in_new);
+		/* restart happens in the child callback handler */
+	}
+	return true;
+}
+
+void
+instance_free(struct service_instance *in)
+{
+	uloop_process_delete(&in->proc);
+	uloop_timeout_cancel(&in->timeout);
+	trigger_del(in);
+	free(in->trigger);
+	instance_config_cleanup(in);
+	free(in->config);
+	free(in);
+}
+
+void
+instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
+{
+	config = blob_memdup(config);
+	in->srv = s;
+	in->name = blobmsg_name(config);
+	in->config = config;
+	in->timeout.cb = instance_timeout;
+	in->proc.cb = instance_exit;
+
+	blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
+	blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
+	blobmsg_list_simple_init(&in->env);
+	blobmsg_list_simple_init(&in->data);
+	in->valid = instance_config_parse(in);
+}
+
+void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
+{
+	void *i;
+
+	i = blobmsg_open_table(b, in->name);
+	blobmsg_add_u8(b, "running", in->proc.pending);
+	if (in->proc.pending)
+		blobmsg_add_u32(b, "pid", in->proc.pid);
+	blobmsg_add_blob(b, in->command);
+
+	if (!avl_is_empty(&in->env.avl)) {
+		struct blobmsg_list_node *var;
+		void *e = blobmsg_open_table(b, "env");
+		blobmsg_list_for_each(&in->env, var)
+			blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
+		blobmsg_close_table(b, e);
+	}
+
+	if (in->respawn) {
+		void *r = blobmsg_open_table(b, "respawn");
+		blobmsg_add_u32(b, "timeout", in->respawn_timeout);
+		blobmsg_add_u32(b, "threshold", in->respawn_threshold);
+		blobmsg_add_u32(b, "retry", in->respawn_retry);
+		blobmsg_close_table(b, r);
+	}
+
+	if (verbose && in->trigger)
+		blobmsg_add_blob(b, in->trigger);
+
+	blobmsg_close_table(b, i);
+}