+/*
+ * 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/stat.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <linux/types.h>
+#include <linux/netlink.h>
+
+#include <libubox/blobmsg_json.h>
+#include <libubox/json_script.h>
+#include <libubox/uloop.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <libgen.h>
+
+#include "procd.h"
#include "hotplug.h"
-void rule_handle_command(const char *name, struct blob_attr *data)
+#define HOTPLUG_WAIT 500
+
+struct cmd_queue {
+ struct list_head list;
+
+ struct blob_attr *msg;
+ struct blob_attr *data;
+ void (*handler)(struct blob_attr *msg, struct blob_attr *data);
+};
+
+static LIST_HEAD(cmd_queue);
+static struct uloop_process queue_proc;
+static struct uloop_timeout last_event;
+static struct blob_buf b;
+static char *rule_file;
+static struct blob_buf script;
+
+static char *hotplug_msg_find_var(struct blob_attr *msg, const char *name)
+{
+ struct blob_attr *cur;
+ int rem;
+
+ blobmsg_for_each_attr(cur, msg, rem) {
+ if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
+ continue;
+
+ if (strcmp(blobmsg_name(cur), name) != 0)
+ continue;
+
+ return blobmsg_data(cur);
+ }
+
+ return NULL;
+}
+
+static void mkdir_p(char *dir)
+{
+ char *l = strrchr(dir, '/');
+
+ if (l) {
+ *l = '\0';
+ mkdir_p(dir);
+ *l = '/';
+ mkdir(dir, 0755);
+ }
+}
+
+static void handle_makedev(struct blob_attr *msg, struct blob_attr *data)
+{
+ unsigned int oldumask = umask(0);
+ static struct blobmsg_policy mkdev_policy[2] = {
+ { .type = BLOBMSG_TYPE_STRING },
+ { .type = BLOBMSG_TYPE_STRING },
+ };
+ struct blob_attr *tb[2];
+ char *minor = hotplug_msg_find_var(msg, "MINOR");
+ char *major = hotplug_msg_find_var(msg, "MAJOR");
+ char *subsystem = hotplug_msg_find_var(msg, "SUBSYSTEM");
+
+ blobmsg_parse_array(mkdev_policy, 2, tb, blobmsg_data(data), blobmsg_data_len(data));
+ if (tb[0] && tb[1] && minor && major && subsystem) {
+ mode_t m = S_IFCHR;
+ char *d = strdup(blobmsg_get_string(tb[0]));
+
+ d = dirname(d);
+ mkdir_p(d);
+ free(d);
+
+ if (!strcmp(subsystem, "block"))
+ m = S_IFBLK;
+ mknod(blobmsg_get_string(tb[0]),
+ m | strtoul(blobmsg_data(tb[1]), NULL, 8),
+ makedev(atoi(major), atoi(minor)));
+ }
+ umask(oldumask);
+}
+
+static void handle_rm(struct blob_attr *msg, struct blob_attr *data)
+{
+ static struct blobmsg_policy rm_policy = {
+ .type = BLOBMSG_TYPE_STRING,
+ };
+ struct blob_attr *tb;
+
+ blobmsg_parse_array(&rm_policy, 1, &tb, blobmsg_data(data), blobmsg_data_len(data));
+ if (tb)
+ unlink(blobmsg_data(tb));
+}
+
+static void handle_exec(struct blob_attr *msg, struct blob_attr *data)
+{
+ char *argv[8];
+ struct blob_attr *cur;
+ int rem, fd;
+ int i = 0;
+
+ blobmsg_for_each_attr(cur, msg, rem)
+ setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
+
+ blobmsg_for_each_attr(cur, data, rem) {
+ argv[i] = blobmsg_data(cur);
+ i++;
+ if (i == 7)
+ break;
+ }
+
+ if (debug < 2) {
+ 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);
+ }
+ }
+
+ if (i > 0) {
+ argv[i] = NULL;
+ execvp(argv[0], &argv[0]);
+ }
+ exit(-1);
+}
+
+static void handle_firmware(struct blob_attr *msg, struct blob_attr *data)
+{
+ char *dir = blobmsg_get_string(blobmsg_data(data));
+ char *file = hotplug_msg_find_var(msg, "FIRMWARE");
+ char *dev = hotplug_msg_find_var(msg, "DEVPATH");
+ void *fw_data;
+ struct stat s;
+ char *path, loadpath[256], syspath[256];
+ int fw, load, sys, len;
+
+ DEBUG(1, "Firmware request for %s/%s\n", dir, file);
+
+ if (!file || !dir || !dev) {
+ ERROR("Request for unknown firmware %s/%s\n", dir, file);
+ exit(-1);
+ }
+
+ path = malloc(strlen(dir) + strlen(file) + 2);
+ if (!path) {
+ ERROR("Failed to allocate memory\n");
+ exit(-1);
+ }
+ sprintf(path, "%s/%s", dir, file);
+
+ if (stat(path, &s)) {
+ ERROR("Could not find firmware %s\n", path);
+ exit(-1);
+ }
+
+ fw_data = malloc(s.st_size);
+ if (!fw_data) {
+ ERROR("Failed to allocate firmware data memory\n");
+ exit(-1);
+ }
+
+ fw = open(path, O_RDONLY);
+ if (!fw) {
+ ERROR("Failed to open %s\n", path);
+ exit(-1);
+ }
+ if (read(fw, fw_data, s.st_size) != s.st_size) {
+ ERROR("Failed to read firmware data\n");
+ exit(-1);
+ }
+ close(fw);
+
+ snprintf(loadpath, sizeof(loadpath), "/sys/%s/loading", dev);
+ load = open(loadpath, O_WRONLY);
+ if (!load) {
+ ERROR("Failed to open %s\n", loadpath);
+ exit(-1);
+ }
+ write(load, "1", 1);
+ close(load);
+
+ snprintf(syspath, sizeof(syspath), "/sys/%s/data", dev);
+ sys = open(syspath, O_WRONLY);
+ if (!sys) {
+ ERROR("Failed to open %s\n", syspath);
+ exit(-1);
+ }
+
+ len = s.st_size;
+ while (len > 4096) {
+ write(fw, fw_data, 4096);
+ len -= 4096;
+ }
+ if (len)
+ write(fw, fw_data, len);
+ close(fw);
+
+ load = open(loadpath, O_WRONLY);
+ write(load, "0", 1);
+ close(load);
+
+ DEBUG(1, "Done loading %s\n", path);
+
+ exit(-1);
+}
+
+static struct cmd_handler {
+ char *name;
+ int atomic;
+ void (*handler)(struct blob_attr *msg, struct blob_attr *data);
+} handlers[] = {
+ {
+ .name = "makedev",
+ .atomic = 1,
+ .handler = handle_makedev,
+ }, {
+ .name = "rm",
+ .atomic = 1,
+ .handler = handle_rm,
+ }, {
+ .name = "exec",
+ .handler = handle_exec,
+ }, {
+ .name = "load-firmware",
+ .handler = handle_firmware,
+ },
+};
+
+static void queue_next(void)
+{
+ struct cmd_queue *c;
+
+ if (queue_proc.pending || list_empty(&cmd_queue))
+ return;
+
+ c = list_first_entry(&cmd_queue, struct cmd_queue, list);
+
+ queue_proc.pid = fork();
+ if (!queue_proc.pid) {
+ uloop_done();
+ c->handler(c->msg, c->data);
+ exit(0);
+ }
+
+ list_del(&c->list);
+ free(c);
+
+ if (queue_proc.pid <= 0) {
+ queue_next();
+ return;
+ }
+
+ uloop_process_add(&queue_proc);
+
+ DEBUG(2, "Launched hotplug exec instance, pid=%d\n", (int) queue_proc.pid);
+}
+
+static void queue_proc_cb(struct uloop_process *c, int ret)
+{
+ DEBUG(2, "Finished hotplug exec instance, pid=%d\n", (int) c->pid);
+
+ queue_next();
+}
+
+static void queue_add(struct cmd_handler *h, struct blob_attr *msg, struct blob_attr *data)
+{
+ struct cmd_queue *c = NULL;
+ struct blob_attr *_msg, *_data;
+
+ c = calloc_a(sizeof(struct cmd_queue),
+ &_msg, blob_pad_len(msg),
+ &_data, blob_pad_len(data),
+ NULL);
+
+ c->msg = _msg;
+ c->data = _data;
+
+ if (!c)
+ return;
+
+ memcpy(c->msg, msg, blob_pad_len(msg));
+ memcpy(c->data, data, blob_pad_len(data));
+ c->handler = h->handler;
+ list_add_tail(&c->list, &cmd_queue);
+ queue_next();
+}
+
+static const char* rule_handle_var(struct json_script_ctx *ctx, const char *name, struct blob_attr *vars)
{
+ const char *str, *sep;
+
+ if (!strcmp(name, "DEVICENAME") || !strcmp(name, "DEVNAME")) {
+ str = json_script_find_var(ctx, vars, "DEVPATH");
+ if (!str)
+ return NULL;
+
+ sep = strrchr(str, '/');
+ if (sep)
+ return sep + 1;
+
+ return str;
+ }
+
+ return NULL;
}
-void rule_error(struct blob_attr *cur, const char *msg)
+static struct json_script_file *
+rule_handle_file(struct json_script_ctx *ctx, const char *name)
{
+ json_object *obj;
+
+ obj = json_object_from_file((char*)name);
+ if (is_error(obj))
+ return NULL;
+
+ blob_buf_init(&script, 0);
+ blobmsg_add_json_element(&script, "", obj);
+
+ return json_script_file_from_blobmsg(name, blob_data(script.head), blob_len(script.head));
}
+static void rule_handle_command(struct json_script_ctx *ctx, const char *name,
+ struct blob_attr *data, struct blob_attr *vars)
+{
+ struct blob_attr *cur;
+ int rem, i;
+
+ if (debug > 1) {
+ DEBUG(2, "Command: %s", name);
+ blobmsg_for_each_attr(cur, data, rem)
+ DEBUG(2, " %s", (char *) blobmsg_data(cur));
+ DEBUG(2, "\n");
+
+ DEBUG(2, "Message:");
+ blobmsg_for_each_attr(cur, vars, rem)
+ DEBUG(2, " %s=%s", blobmsg_name(cur), (char *) blobmsg_data(cur));
+ DEBUG(2, "\n");
+ }
+
+ for (i = 0; i < ARRAY_SIZE(handlers); i++)
+ if (!strcmp(handlers[i].name, name)) {
+ if (handlers[i].atomic)
+ handlers[i].handler(vars, data);
+ else
+ queue_add(&handlers[i], vars, data);
+ break;
+ }
+
+ if (last_event.cb)
+ uloop_timeout_set(&last_event, HOTPLUG_WAIT);
+}
+
+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 struct json_script_ctx jctx = {
+ .handle_var = rule_handle_var,
+ .handle_error = rule_handle_error,
+ .handle_command = rule_handle_command,
+ .handle_file = rule_handle_file,
+};
+
+static void hotplug_handler(struct uloop_fd *u, unsigned int ev)
+{
+ int i = 0;
+ static char buf[4096];
+ int len = recv(u->fd, buf, sizeof(buf), MSG_DONTWAIT);
+ void *index;
+ if (len < 1)
+ return;
+
+ blob_buf_init(&b, 0);
+ index = blobmsg_open_table(&b, NULL);
+ while (i < len) {
+ int l = strlen(buf + i) + 1;
+ char *e = strstr(&buf[i], "=");
+
+ if (e) {
+ *e = '\0';
+ blobmsg_add_string(&b, &buf[i], &e[1]);
+ }
+ i += l;
+ }
+ blobmsg_close_table(&b, index);
+ DEBUG(3, "%s\n", blobmsg_format_json(b.head, true));
+ json_script_run(&jctx, rule_file, blob_data(b.head));
+}
+
+static struct uloop_fd hotplug_fd = {
+ .cb = hotplug_handler,
+};
+
+void hotplug_last_event(uloop_timeout_handler handler)
+{
+ last_event.cb = handler;
+ if (handler)
+ uloop_timeout_set(&last_event, HOTPLUG_WAIT);
+ else
+ uloop_timeout_cancel(&last_event);
+}
+
+void hotplug(char *rules)
+{
+ struct sockaddr_nl nls;
+
+ rule_file = strdup(rules);
+ memset(&nls,0,sizeof(struct sockaddr_nl));
+ nls.nl_family = AF_NETLINK;
+ nls.nl_pid = getpid();
+ nls.nl_groups = -1;
+
+ if ((hotplug_fd.fd = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT)) == -1) {
+ ERROR("Failed to open hotplug socket: %s\n", strerror(errno));
+ exit(1);
+ }
+ if (bind(hotplug_fd.fd, (void *)&nls, sizeof(struct sockaddr_nl))) {
+ ERROR("Failed to bind hotplug socket: %s\n", strerror(errno));
+ exit(1);
+ }
+
+ json_script_init(&jctx);
+ queue_proc.cb = queue_proc_cb;
+ uloop_fd_add(&hotplug_fd, ULOOP_READ);
+}
+
+void hotplug_shutdown(void)
+{
+ uloop_fd_delete(&hotplug_fd);
+ close(hotplug_fd.fd);
+}
projects / project / procd.git / blobdiff