+/*
+ * 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 <stdio.h>
+#include <string.h>
+#include <getopt.h>
+#include <syslog.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <glob.h>
+#include <dirent.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+
+#include <asm/byteorder.h>
+
+#include <mtd/mtd-user.h>
+
+#define DEBUG(level, fmt, ...) do { \
+ if (debug >= level) \
+ fprintf(stderr, "%s %s(%d): " fmt, argv0, __func__, __LINE__, ## __VA_ARGS__); \
+ } while (0)
+
+#define LOG(fmt, ...) do { \
+ syslog(LOG_INFO, fmt, ## __VA_ARGS__); \
+ fprintf(stderr, "%s: "fmt, argv0, ## __VA_ARGS__); \
+ } while (0)
+
+#define ERROR(fmt, ...) do { \
+ syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
+ fprintf(stderr, "%s: "fmt, argv0, ## __VA_ARGS__); \
+ } while (0)
+
+enum {
+ FS_NONE,
+ FS_JFFS2,
+ FS_DEADCODE,
+};
+
+static const char *argv0;
+
+/* this is a raw syscall - man 2 pivot_root */
+extern int pivot_root(const char *new_root, const char *put_old);
+
+static int debug = 0;
+
+static void foreachdir(const char *dir, int (*cb)(const char*))
+{
+ char globdir[256];
+ glob_t gl;
+ int j;
+
+ if (dir[strlen(dir) - 1] == '/')
+ snprintf(globdir, 256, "%s*", dir);
+ else
+ snprintf(globdir, 256, "%s/*", dir);
+
+ if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
+ for (j = 0; j < gl.gl_pathc; j++)
+ foreachdir(gl.gl_pathv[j], cb);
+
+ cb(dir);
+}
+
+static char* find_mount_point(char *block, char *fs)
+{
+ FILE *fp = fopen("/proc/mounts", "r");
+ static char line[256];
+ int len = strlen(block);
+ char *point = NULL;
+
+ if(!fp)
+ return NULL;
+
+ while (fgets(line, sizeof(line), fp)) {
+ if (!strncmp(line, block, len)) {
+ char *p = &line[len + 1];
+ char *t = strstr(p, " ");
+
+ if (!t)
+ return NULL;
+
+ *t = '\0';
+ t++;
+
+ if (fs && strncmp(t, fs, strlen(fs))) {
+ ERROR("block is mounted with wrong fs\n");
+ return NULL;
+ }
+ point = p;
+ break;
+ }
+ }
+
+ fclose(fp);
+
+ return point;
+}
+
+static char* find_mtd_index(char *name)
+{
+ FILE *fp = fopen("/proc/mtd", "r");
+ static char line[256];
+ char *index = NULL;
+
+ if(!fp)
+ return index;
+
+ while (!index && fgets(line, sizeof(line), fp)) {
+ if (strstr(line, name)) {
+ char *eol = strstr(line, ":");
+
+ if (!eol)
+ continue;
+
+ *eol = '\0';
+ index = &line[3];
+ DEBUG(1, "found %s -> index:%s\n", name, index);
+ }
+ }
+
+ fclose(fp);
+
+ return index;
+}
+
+static int find_mtd_block(char *name, char *part, int plen)
+{
+ char *index = find_mtd_index(name);
+
+ if (!index)
+ return -1;
+
+ snprintf(part, plen, "/dev/mtdblock%s", index);
+ DEBUG(1, "found %s -> %s\n", name, part);
+
+ return 0;
+}
+
+static int find_mtd_char(char *name, char *part, int plen)
+{
+ char *index = find_mtd_index(name);
+
+ if (!index)
+ return -1;
+
+ snprintf(part, plen, "/dev/mtd%s", index);
+ DEBUG(1, "found %s -> %s\n", name, part);
+
+ return 0;
+}
+
+static int mtd_unlock(char *mtd)
+{
+ struct erase_info_user mtdlock;
+ struct mtd_info_user mtdinfo;
+ int fd = open(mtd, O_RDWR | O_SYNC);
+ int ret = -1;
+
+ DEBUG(1, "%s\n", mtd);
+
+ if (!fd) {
+ ERROR("failed to open %s: %s\n", mtd, strerror(errno));
+ return -1;
+ }
+
+ ret = ioctl(fd, MEMGETINFO, &mtdinfo);
+ if (ret) {
+ ERROR("ioctl(%s, MEMGETINFO) failed: %s\n", mtd, strerror(errno));
+ goto err_out;
+ }
+
+ mtdlock.start = 0;
+ mtdlock.length = mtdinfo.size;
+ ioctl(fd, MEMUNLOCK, &mtdlock);
+
+err_out:
+ close(fd);
+
+ return ret;
+}
+
+static int mtd_erase(const char *mtd)
+{
+ int fd = open(mtd, O_RDWR | O_SYNC);
+ struct mtd_info_user i;
+ struct erase_info_user e;
+ int ret;
+
+ if (!fd) {
+ ERROR("failed to open %s: %s\n", mtd, strerror(errno));
+ return -1;
+ }
+
+ ret = ioctl(fd, MEMGETINFO, &i);
+ if (ret) {
+ ERROR("ioctl(%s, MEMGETINFO) failed: %s\n", mtd, strerror(errno));
+ return -1;
+ }
+
+ e.length = i.erasesize;
+ for (e.start = 0; e.start < i.size; e.start += i.erasesize) {
+ ioctl(fd, MEMUNLOCK, &e);
+ if(ioctl(fd, MEMERASE, &e))
+ ERROR("Failed to erase block on %s at 0x%x\n", mtd, e.start);
+ }
+
+ close(fd);
+ return 0;
+}
+
+static int do_mount_jffs2(void)
+{
+ char rootfs_data[32];
+
+
+ if (mkdir("/tmp/overlay", 0755)) {
+ ERROR("failed to mkdir /tmp/overlay: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (find_mtd_block("rootfs_data", rootfs_data, sizeof(rootfs_data))) {
+ ERROR("rootfs_data does not exist\n");
+ return -1;
+ }
+
+ if (mount(rootfs_data, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
+ ERROR("failed to mount -t jffs2 %s /tmp/overlay: %s\n", rootfs_data, strerror(errno));
+ return -1;
+ }
+
+ find_mtd_char("rootfs_data", rootfs_data, sizeof(rootfs_data));
+
+ return mtd_unlock(rootfs_data);
+}
+
+static int jffs2_ready(char *mtd)
+{
+ FILE *fp = fopen(mtd, "r");
+ __u32 deadc0de;
+ __u16 jffs2;
+ size_t sz;
+
+ if (!fp) {
+ ERROR("reading %s failed\n", mtd);
+ exit(-1);
+ }
+
+ sz = fread(&deadc0de, sizeof(deadc0de), 1, fp);
+ fclose(fp);
+
+ if (sz != 1) {
+ ERROR("reading %s failed: %s\n", mtd, strerror(errno));
+ exit(-1);
+ }
+
+ deadc0de = __be32_to_cpu(deadc0de);
+ jffs2 = __be16_to_cpu(deadc0de >> 16);
+
+ if (jffs2 == 0x1985) {
+ LOG("jffs2 is ready\n");
+ return FS_JFFS2;
+ }
+
+ if (deadc0de == 0xdeadc0de) {
+ LOG("jffs2 is not ready - marker found\n");
+ return FS_DEADCODE;
+ }
+
+ ERROR("No jffs2 marker was found\n");
+
+ return FS_NONE;
+}
+
+static int check_fs_exists(char *fs)
+{
+ FILE *fp = fopen("/proc/filesystems", "r");
+ static char line[256];
+ int ret = -1;
+
+ DEBUG(2, "%s\n", fs);
+
+ if (!fp) {
+ ERROR("opening /proc/filesystems failed: %s\n", strerror(errno));
+ goto out;
+ }
+
+ while (ret && fgets(line, sizeof(line), fp))
+ if (strstr(line, fs))
+ ret = 0;
+
+ fclose(fp);
+
+out:
+ return ret;
+}
+
+static int mount_move(char *oldroot, char *newroot, char *dir)
+{
+#ifndef MS_MOVE
+#define MS_MOVE (1 << 13)
+#endif
+ struct stat s;
+ char olddir[64];
+ char newdir[64];
+ int ret;
+
+ DEBUG(2, "%s %s\n", oldroot, dir);
+
+ snprintf(olddir, sizeof(olddir), "%s%s", oldroot, dir);
+ snprintf(newdir, sizeof(newdir), "%s%s", newroot, dir);
+
+ if (stat(olddir, &s) || !S_ISDIR(s.st_mode))
+ return -1;
+
+ if (stat(newdir, &s) || !S_ISDIR(s.st_mode))
+ return -1;
+
+ ret = mount(olddir, newdir, NULL, MS_NOATIME | MS_MOVE, NULL);
+
+ if (ret)
+ DEBUG(1, "failed %s %s: %s\n", olddir, newdir, strerror(errno));
+
+ return ret;
+}
+
+static int pivot(char *new, char *old)
+{
+ char pivotdir[64];
+ int ret;
+
+ DEBUG(2, "%s %s\n", new, old);
+
+ if (mount_move("", new, "/proc"))
+ return -1;
+
+ snprintf(pivotdir, sizeof(pivotdir), "%s%s", new, old);
+
+ ret = pivot_root(new, pivotdir);
+
+ if (ret < 0) {
+ ERROR("pivot_root failed %s %s: %s\n", new, pivotdir, strerror(errno));
+ return -1;
+ }
+
+ mount_move(old, "", "/dev");
+ mount_move(old, "", "/tmp");
+ mount_move(old, "", "/sys");
+ mount_move(old, "", "/overlay");
+
+ return 0;
+}
+
+
+static int fopivot(char *rw_root, char *ro_root)
+{
+ char overlay[64], lowerdir[64];
+
+ DEBUG(2, "%s %s\n", rw_root, ro_root);
+
+ if (check_fs_exists("overlay")) {
+ ERROR("BUG: no suitable fs found\n");
+ return -1;
+ }
+
+ snprintf(overlay, sizeof(overlay), "overlayfs:%s", rw_root);
+ snprintf(lowerdir, sizeof(lowerdir), "lowerdir=/,upperdir=%s", rw_root);
+
+ if (mount(overlay, "/mnt", "overlayfs", MS_NOATIME, lowerdir)) {
+ ERROR("mount failed: %s\n", strerror(errno));
+ return -1;
+ }
+
+ return pivot("/mnt", ro_root);
+}
+
+static int ramoverlay(void)
+{
+ DEBUG(2, "\n");
+
+ mkdir("/tmp/root", 0755);
+ mount("tmpfs", "/tmp/root", "tmpfs", MS_NOATIME, "mode=0755");
+
+ return fopivot("/tmp/root", "/rom");
+}
+
+static int switch2jffs(void)
+{
+ char mtd[32];
+
+ if (find_mtd_block("rootfs_data", mtd, sizeof(mtd))) {
+ ERROR("no rootfs_data was found\n");
+ return -1;
+ }
+
+ if (mount(mtd, "/rom/overlay", "jffs2", MS_NOATIME, NULL)) {
+ ERROR("failed - mount -t jffs2 %s /rom/overlay: %s\n", mtd, strerror(errno));
+ return -1;
+ }
+
+ if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
+ ERROR("failed - mount -o remount,ro none: %s\n", strerror(errno));
+ return -1;
+ }
+
+ system("cp -a /tmp/root/* /rom/overlay");
+
+ if (pivot("/rom", "/mnt")) {
+ ERROR("failed - pivot /rom /mnt: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (mount_move("/mnt", "/tmp/root", "")) {
+ ERROR("failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
+ return -1;
+ }
+
+ return fopivot("/overlay", "/rom");
+}
+
+static int handle_whiteout(const char *dir)
+{
+ struct stat s;
+ char link[256];
+ ssize_t sz;
+ struct dirent **namelist;
+ int n;
+
+ n = scandir(dir, &namelist, NULL, NULL);
+
+ if (n < 1)
+ return -1;
+
+ while (n--) {
+ char file[256];
+
+ snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
+ if (!lstat(file, &s) && S_ISLNK(s.st_mode)) {
+ sz = readlink(file, link, sizeof(link) - 1);
+ if (sz > 0) {
+ char *orig;
+
+ link[sz] = '\0';
+ orig = strstr(&file[1], "/");
+ if (orig && !strcmp(link, "(overlay-whiteout)")) {
+ DEBUG(1, "unlinking %s\n", orig);
+ unlink(orig);
+ }
+ }
+ }
+ free(namelist[n]);
+ }
+ free(namelist);
+
+ return 0;
+}
+
+static int main_switch2jffs(int argc, char **argv)
+{
+ char mtd[32];
+ char *mp;
+ int ret = -1;
+
+ if (check_fs_exists("overlay")) {
+ ERROR("overlayfs not found\n");
+ return ret;
+ }
+
+ find_mtd_block("rootfs_data", mtd, sizeof(mtd));
+ mp = find_mount_point(mtd, NULL);
+ if (mp) {
+ LOG("rootfs_data:%s is already mounted as %s\n", mtd, mp);
+ return -1;
+ }
+
+ if (find_mtd_char("rootfs_data", mtd, sizeof(mtd))) {
+ ERROR("no rootfs_data was found\n");
+ return ret;
+ }
+
+ switch (jffs2_ready(mtd)) {
+ case FS_NONE:
+ ERROR("no jffs2 marker found\n");
+ /* fall through */
+
+ case FS_DEADCODE:
+ ret = switch2jffs();
+ if (!ret) {
+ DEBUG(1, "doing fo cleanup\n");
+ umount2("/tmp/root", MNT_DETACH);
+ foreachdir("/overlay/", handle_whiteout);
+ }
+ break;
+
+ case FS_JFFS2:
+ ret = do_mount_jffs2();
+ if (ret)
+ break;
+ if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
+ ERROR("switching to jffs2 failed\n");
+ ret = -1;
+ }
+ break;
+ }
+
+ return ret;
+}
+
+static int ask_user(int argc, char **argv)
+{
+ if ((argc < 2) || strcmp(argv[1], "-y")) {
+ LOG("This will erase all settings and remove any installed packages. Are you sure? [N/y]\n");
+ if (getchar() != 'y')
+ return -1;
+ }
+ return 0;
+
+}
+
+static int handle_rmdir(const char *dir)
+{
+ struct stat s;
+ struct dirent **namelist;
+ int n;
+
+ n = scandir(dir, &namelist, NULL, NULL);
+
+ if (n < 1)
+ return -1;
+
+ while (n--) {
+ char file[256];
+
+ snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
+ if (!lstat(file, &s) && !S_ISDIR(s.st_mode)) {
+ DEBUG(1, "unlinking %s\n", file);
+ unlink(file);
+ }
+ free(namelist[n]);
+ }
+ free(namelist);
+
+ DEBUG(1, "rmdir %s\n", dir);
+ rmdir(dir);
+
+ return 0;
+}
+
+static int main_jffs2reset(int argc, char **argv)
+{
+ char mtd[32];
+ char *mp;
+
+ if (ask_user(argc, argv))
+ return -1;
+
+ if (check_fs_exists("overlay")) {
+ ERROR("overlayfs not found\n");
+ return -1;
+ }
+
+ if (find_mtd_block("rootfs_data", mtd, sizeof(mtd))) {
+ ERROR("no rootfs_data was found\n");
+ return -1;
+ }
+
+ mp = find_mount_point(mtd, "jffs2");
+ if (mp) {
+ LOG("%s is mounted as %s, only ereasing files\n", mtd, mp);
+ foreachdir(mp, handle_rmdir);
+ mount(mp, "/", NULL, MS_REMOUNT, 0);
+ } else {
+ LOG("%s is not mounted, erasing it\n", mtd);
+ find_mtd_char("rootfs_data", mtd, sizeof(mtd));
+ mtd_erase(mtd);
+ }
+
+ return 0;
+}
+
+static int main_jffs2mark(int argc, char **argv)
+{
+ FILE *fp;
+ __u32 deadc0de = __cpu_to_be32(0xdeadc0de);
+ char mtd[32];
+ size_t sz;
+
+ if (ask_user(argc, argv))
+ return -1;
+
+ if (find_mtd_block("rootfs_data", mtd, sizeof(mtd))) {
+ ERROR("no rootfs_data was found\n");
+ return -1;
+ }
+
+ fp = fopen(mtd, "w");
+ LOG("%s - marking with deadc0de\n", mtd);
+ if (!fp) {
+ ERROR("opening %s failed\n", mtd);
+ return -1;
+ }
+
+ sz = fwrite(&deadc0de, sizeof(deadc0de), 1, fp);
+ fclose(fp);
+
+ if (sz != 1) {
+ ERROR("writing %s failed: %s\n", mtd, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ char *mp;
+ char mtd[32];
+
+ argv0 = basename(*argv);
+
+ if (!strcmp(basename(*argv), "switch2jffs"))
+ return main_switch2jffs(argc, argv);
+
+ if (!strcmp(basename(*argv), "jffs2mark"))
+ return main_jffs2mark(argc, argv);
+
+ if (!strcmp(basename(*argv), "jffs2reset"))
+ return main_jffs2reset(argc, argv);
+
+ if (find_mtd_char("rootfs_data", mtd, sizeof(mtd))) {
+ if (!find_mtd_char("rootfs", mtd, sizeof(mtd)))
+ mtd_unlock(mtd);
+ LOG("mounting /dev/root\n");
+ mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
+ } else {
+ switch (jffs2_ready(mtd)) {
+ case FS_NONE:
+ case FS_DEADCODE:
+ return ramoverlay();
+
+ case FS_JFFS2:
+ find_mtd_block("rootfs_data", mtd, sizeof(mtd));
+ mp = find_mount_point(mtd, NULL);
+ if (mp) {
+ LOG("rootfs_data:%s is already mounted as %s\n", mtd, mp);
+ return -1;
+ }
+
+ do_mount_jffs2();
+ DEBUG(1, "switching to jffs2\n");
+ if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
+ ERROR("switching to jffs2 failed - fallback to ramoverlay\n");
+ return ramoverlay();
+ }
+ }
+ }
+
+ return 0;
+}
projects / project / ubox.git / commitdiff