/* * udevstart.c * * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> * * Quick and dirty way to populate a /dev with udev if your system * does not have access to a shell. Based originally on a patch to udev * from Harald Hoyer <harald@redhat.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation version 2 of the License. * * 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. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <stdlib.h> #include <stddef.h> #include <string.h> #include <stdio.h> #include <unistd.h> #include <errno.h> #include <ctype.h> #include <dirent.h> #include <signal.h> #include <sys/wait.h> #include <sys/stat.h> #include <sys/types.h> #include "libsysfs/sysfs/libsysfs.h" #include "udev_libc_wrapper.h" #include "udev_sysfs.h" #include "udev.h" #include "udev_version.h" #include "logging.h" #include "udev_rules.h" #include "udev_utils.h" #include "list.h" static const char *udev_run_str; static const char *udev_log_str; static struct udev_rules rules; #ifdef USE_LOG void log_message(int priority, const char *format, ...) { va_list args; if (priority > udev_log_priority) return; va_start(args, format); vsyslog(priority, format, args); va_end(args); } #endif struct device { struct list_head node; char path[PATH_SIZE]; char subsys[NAME_SIZE]; }; /* sort files in lexical order */ static int device_list_insert(const char *path, char *subsystem, struct list_head *device_list) { struct device *loop_device; struct device *new_device; dbg("insert: '%s'\n", path); list_for_each_entry(loop_device, device_list, node) { if (strcmp(loop_device->path, path) > 0) { break; } } new_device = malloc(sizeof(struct device)); if (new_device == NULL) { dbg("error malloc"); return -ENOMEM; } strlcpy(new_device->path, path, sizeof(new_device->path)); strlcpy(new_device->subsys, subsystem, sizeof(new_device->subsys)); list_add_tail(&new_device->node, &loop_device->node); dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys); return 0; } /* list of devices that we should run last due to any one of a number of reasons */ static char *last_list[] = { "/block/dm", /* on here because dm wants to have the block devices around before it */ NULL, }; /* list of devices that we should run first due to any one of a number of reasons */ static char *first_list[] = { "/class/mem", /* people tend to like their memory devices around first... */ NULL, }; static int add_device(const char *path, const char *subsystem) { struct udevice udev; struct sysfs_class_device *class_dev; const char *devpath; devpath = &path[strlen(sysfs_path)]; /* clear and set environment for next event */ clearenv(); setenv("ACTION", "add", 1); setenv("DEVPATH", devpath, 1); setenv("SUBSYSTEM", subsystem, 1); setenv("UDEV_START", "1", 1); if (udev_log_str) setenv("UDEV_LOG", udev_log_str, 1); if (udev_run_str) setenv("UDEV_RUN", udev_run_str, 1); dbg("exec: '%s' (%s)\n", devpath, path); class_dev = sysfs_open_class_device_path(path); if (class_dev == NULL) { dbg("sysfs_open_class_device_path failed"); return -1; } udev_init_device(&udev, devpath, subsystem, "add"); udev.devt = get_devt(class_dev); if (!udev.devt && udev.type != DEV_NET) { dbg("sysfs_open_class_device_path failed"); return -1; } udev_rules_get_name(&rules, &udev, class_dev); if (udev.ignore_device) { dbg("device event will be ignored"); goto exit; } if (udev.name[0] == '\0') { dbg("device node creation supressed"); goto run; } udev_add_device(&udev, class_dev); if (udev.devname[0] != '\0') setenv("DEVNAME", udev.devname, 1); run: if (udev_run && !list_empty(&udev.run_list)) { struct name_entry *name_loop; dbg("executing run list"); list_for_each_entry(name_loop, &udev.run_list, node) execute_program(name_loop->name, udev.subsystem, NULL, 0, NULL); } exit: sysfs_close_class_device(class_dev); udev_cleanup_device(&udev); return 0; } static void exec_list(struct list_head *device_list) { struct device *loop_device; struct device *tmp_device; int i; /* handle the "first" type devices first */ list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { for (i = 0; first_list[i] != NULL; i++) { if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) { add_device(loop_device->path, loop_device->subsys); list_del(&loop_device->node); free(loop_device); break; } } } /* handle the devices we are allowed to, excluding the "last" type devices */ list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { int found = 0; for (i = 0; last_list[i] != NULL; i++) { if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) { found = 1; break; } } if (found) continue; add_device(loop_device->path, loop_device->subsys); list_del(&loop_device->node); free(loop_device); } /* handle the rest of the devices left over, if any */ list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { add_device(loop_device->path, loop_device->subsys); list_del(&loop_device->node); free(loop_device); } } static int has_devt(const char *directory) { char filename[PATH_SIZE]; struct stat statbuf; snprintf(filename, sizeof(filename), "%s/dev", directory); filename[sizeof(filename)-1] = '\0'; if (stat(filename, &statbuf) == 0) return 1; return 0; } static void udev_scan_block(void) { char base[PATH_SIZE]; DIR *dir; struct dirent *dent; LIST_HEAD(device_list); snprintf(base, sizeof(base), "%s/block", sysfs_path); base[sizeof(base)-1] = '\0'; dir = opendir(base); if (dir != NULL) { for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { char dirname[PATH_SIZE]; DIR *dir2; struct dirent *dent2; if (dent->d_name[0] == '.') continue; snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name); dirname[sizeof(dirname)-1] = '\0'; if (has_devt(dirname)) device_list_insert(dirname, "block", &device_list); else continue; /* look for partitions */ dir2 = opendir(dirname); if (dir2 != NULL) { for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { char dirname2[PATH_SIZE]; if (dent2->d_name[0] == '.') continue; snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name); dirname2[sizeof(dirname2)-1] = '\0'; if (has_devt(dirname2)) device_list_insert(dirname2, "block", &device_list); } closedir(dir2); } } closedir(dir); } exec_list(&device_list); } static void udev_scan_class(void) { char base[PATH_SIZE]; DIR *dir; struct dirent *dent; LIST_HEAD(device_list); snprintf(base, sizeof(base), "%s/class", sysfs_path); base[sizeof(base)-1] = '\0'; dir = opendir(base); if (dir != NULL) { for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { char dirname[PATH_SIZE]; DIR *dir2; struct dirent *dent2; if (dent->d_name[0] == '.') continue; snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name); dirname[sizeof(dirname)-1] = '\0'; dir2 = opendir(dirname); if (dir2 != NULL) { for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { char dirname2[PATH_SIZE]; if (dent2->d_name[0] == '.') continue; snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name); dirname2[sizeof(dirname2)-1] = '\0'; /* pass the net class as it is */ if (strcmp(dent->d_name, "net") == 0) device_list_insert(dirname2, "net", &device_list); else if (has_devt(dirname2)) device_list_insert(dirname2, dent->d_name, &device_list); } closedir(dir2); } } closedir(dir); } exec_list(&device_list); } static void asmlinkage sig_handler(int signum) { switch (signum) { case SIGALRM: exit(1); case SIGINT: case SIGTERM: exit(20 + signum); } } int main(int argc, char *argv[], char *envp[]) { struct sigaction act; logging_init("udevstart"); udev_init_config(); dbg("version %s", UDEV_VERSION); udev_run_str = getenv("UDEV_RUN"); udev_log_str = getenv("UDEV_LOG"); /* disable all logging if not explicitely requested */ if (udev_log_str == NULL) udev_log_priority = 0; /* set signal handlers */ memset(&act, 0x00, sizeof(act)); act.sa_handler = (void (*) (int))sig_handler; sigemptyset (&act.sa_mask); act.sa_flags = 0; sigaction(SIGALRM, &act, NULL); sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); /* trigger timeout to prevent hanging processes */ alarm(ALARM_TIMEOUT); udev_rules_init(&rules, 1); udev_scan_block(); udev_scan_class(); udev_rules_close(&rules); logging_close(); return 0; }