+++ /dev/null
-/*
- * 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"
-
-#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;
-}
-
-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