--- /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 <stdio.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <libgen.h>
+#include <glob.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/swap.h>
+#include <sys/mount.h>
+
+#include <uci.h>
+#include <uci_blob.h>
+
+#include <libubox/list.h>
+#include <libubox/vlist.h>
+#include <libubox/blobmsg_json.h>
+#include <libubox/avl-cmp.h>
+
+#include "libblkid-tiny/libblkid-tiny.h"
+
+enum {
+ TYPE_MOUNT,
+ TYPE_SWAP,
+};
+
+struct mount {
+ struct vlist_node node;
+ int type;
+
+ char *target;
+ char *path;
+ char *options;
+ char *uuid;
+ char *label;
+ int disabled_fsck;
+ unsigned int prio;
+};
+
+static struct vlist_tree mounts;
+static struct blob_buf b;
+static LIST_HEAD(devices);
+
+enum {
+ MOUNT_UUID,
+ MOUNT_LABEL,
+ MOUNT_ENABLE,
+ MOUNT_TARGET,
+ MOUNT_OPTIONS,
+ __MOUNT_MAX
+};
+
+static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
+ [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
+ [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
+ [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
+ [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
+ [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
+};
+
+static const struct uci_blob_param_list mount_attr_list = {
+ .n_params = __MOUNT_MAX,
+ .params = mount_policy,
+};
+
+enum {
+ SWAP_ENABLE,
+ SWAP_UUID,
+ SWAP_PRIO,
+ __SWAP_MAX
+};
+
+static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
+ [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
+ [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
+ [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
+};
+
+static const struct uci_blob_param_list swap_attr_list = {
+ .n_params = __SWAP_MAX,
+ .params = swap_policy,
+};
+
+static char *blobmsg_get_strdup(struct blob_attr *attr)
+{
+ if (!attr)
+ return NULL;
+
+ return strdup(blobmsg_get_string(attr));
+}
+
+static int mount_add(struct uci_section *s)
+{
+ struct blob_attr *tb[__MOUNT_MAX] = { 0 };
+ struct mount *m;
+
+ blob_buf_init(&b, 0);
+ uci_to_blob(&b, s, &mount_attr_list);
+ blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
+
+ if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID])
+ return -1;
+
+ if (!tb[MOUNT_TARGET])
+ return -1;
+
+ m = malloc(sizeof(struct mount));
+ m->type = TYPE_MOUNT;
+ m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
+ m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
+ m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
+ m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
+
+ if ((!tb[MOUNT_ENABLE]) || blobmsg_get_u32(tb[MOUNT_ENABLE]))
+ vlist_add(&mounts, &m->node, m->target);
+
+ return 0;
+}
+
+static int swap_add(struct uci_section *s)
+{
+ struct blob_attr *tb[__SWAP_MAX] = { 0 };
+ struct mount *m;
+
+ blob_buf_init(&b, 0);
+ uci_to_blob(&b, s, &swap_attr_list);
+ blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
+
+ if (!tb[SWAP_UUID])
+ return -1;
+
+ m = malloc(sizeof(struct mount));
+ memset(m, 0, sizeof(struct mount));
+ m->type = TYPE_SWAP;
+ m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
+ if (tb[SWAP_PRIO])
+ m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
+ if (m->prio)
+ m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
+
+ if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
+ vlist_add(&mounts, &m->node, m->uuid);
+
+ return 0;
+}
+
+static struct mount* find_swap(const char *uuid)
+{
+ struct mount *m;
+
+ if (!uuid)
+ return NULL;
+
+ vlist_for_each_element(&mounts, m, node)
+ if ((m->type == TYPE_SWAP) && m->uuid && !strcmp(m->uuid, uuid))
+ return m;
+
+ return NULL;
+}
+
+static struct mount* find_block(const char *uuid, const char *label, const char *target)
+{
+ struct mount *m;
+
+ vlist_for_each_element(&mounts, m, node) {
+ if ((m->type == TYPE_MOUNT) && m->uuid && uuid && !strcmp(m->uuid, uuid))
+ return m;
+ if ((m->type == TYPE_MOUNT) && m->label && label && !strcmp(m->label, label))
+ return m;
+ if ((m->type == TYPE_MOUNT) && target && !strcmp(m->target, target))
+ return m;
+ }
+
+ return NULL;
+}
+
+static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
+ struct vlist_node *node_old)
+{
+}
+
+static int config_load(char *cfg)
+{
+ struct uci_context *ctx;
+ struct uci_package *pkg;
+ struct uci_element *e;
+
+ vlist_init(&mounts, avl_strcmp, mounts_update);
+
+ ctx = uci_alloc_context();
+ if (cfg) {
+ char path[32];
+ snprintf(path, 32, "%s/etc/config", cfg);
+ uci_set_confdir(ctx, path);
+ }
+
+ if (uci_load(ctx, "fstab", &pkg))
+ return -1;
+
+ vlist_update(&mounts);
+ uci_foreach_element(&pkg->sections, e) {
+ struct uci_section *s = uci_to_section(e);
+
+ if (!strcmp(s->type, "mount"))
+ mount_add(s);
+ if (!strcmp(s->type, "swap"))
+ swap_add(s);
+ }
+ vlist_flush(&mounts);
+
+ return 0;
+}
+
+static int _cache_load(const char *path)
+{
+ int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
+ int j;
+ glob_t gl;
+
+ if (glob(path, gl_flags, NULL, &gl) < 0)
+ return -1;
+
+ for (j = 0; j < gl.gl_pathc; j++) {
+ struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
+ memset(pr, 0, sizeof(struct blkid_struct_probe));
+ probe_block(gl.gl_pathv[j], pr);
+ if (pr->err)
+ free(pr);
+ else
+ list_add_tail(&pr->list, &devices);
+ }
+
+ globfree(&gl);
+
+ return 0;
+}
+
+static void cache_load(int mtd)
+{
+ if (mtd)
+ _cache_load("/dev/mtdblock*");
+ _cache_load("/dev/sd*");
+}
+
+static int print_block_info(struct blkid_struct_probe *pr)
+{
+ printf("%s:", pr->dev);
+ if (pr->uuid[0])
+ printf(" UUID=\"%s\"", pr->uuid);
+
+ if (pr->label[0])
+ printf(" LABEL=\"%s\"", pr->label);
+
+ if (pr->name[0])
+ printf(" NAME=\"%s\"", pr->name);
+
+ if (pr->version[0])
+ printf(" VERSION=\"%s\"", pr->version);
+
+ printf(" TYPE=\"%s\"\n", pr->id->name);
+
+ return 0;
+}
+
+static int print_block_uci(struct blkid_struct_probe *pr)
+{
+ if (!pr->uuid[0])
+ return 0;
+
+ if (!strcmp(pr->id->name, "swap")) {
+ printf("config 'swap'\n");
+ } else {
+ printf("config 'mount'\n");
+ printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
+ }
+ printf("\toption\tuuid\t'%s'\n", pr->uuid);
+ printf("\toption\tenabled\t'0'\n\n");
+
+ return 0;
+}
+
+static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
+{
+ struct blkid_struct_probe *pr = NULL;
+
+ if (uuid)
+ list_for_each_entry(pr, &devices, list)
+ if (!strcmp(pr->uuid, uuid))
+ return pr;
+
+ if (label)
+ list_for_each_entry(pr, &devices, list)
+ if (strcmp(pr->label, label))
+ return pr;
+
+ if (path)
+ list_for_each_entry(pr, &devices, list)
+ if (!strcmp(pr->dev, path))
+ return pr;
+
+ return NULL;
+}
+
+static char* find_mount_point(char *block)
+{
+ 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';
+ point = p;
+ break;
+ }
+ }
+
+ fclose(fp);
+
+ return point;
+}
+
+static void mkdir_p(char *dir)
+{
+ char *l = strrchr(dir, '/');
+
+ if (l) {
+ *l = '\0';
+ mkdir_p(dir);
+ *l = '/';
+ mkdir(dir, 0755);
+ }
+}
+
+static int main_hotplug(int argc, char **argv)
+{
+ struct mount *m;
+ char path[256];
+ char *action, *device, *mount_point;
+ struct blkid_struct_probe *pr;
+
+ action = getenv("ACTION");
+ device = getenv("DEVNAME");
+
+ if (!action || !device)
+ return -1;
+ snprintf(path, sizeof(path), "/dev/%s", device);
+
+ if (!strcmp(action, "remove")) {
+ int err = 0;
+ mount_point = find_mount_point(path);
+ if (mount_point)
+ err = umount2(mount_point, MNT_DETACH);
+
+ if (err)
+ fprintf(stderr, "unmount of %s failed (%d) - %s\n",
+ mount_point, err, strerror(err));
+
+ return 0;
+ } else if (strcmp(action, "add")) {
+ fprintf(stderr, "Unkown action %s\n", action);
+
+ return -1;
+ }
+
+ if (config_load(NULL))
+ return -1;
+ cache_load(0);
+
+ pr = find_block_info(NULL, NULL, path);
+ if (!pr && pr->uuid) {
+ fprintf(stderr, "failed to read blockinfo for %s\n", path);
+ return -1;
+ }
+
+ m = find_swap(pr->uuid);
+ if (m) {
+ if (!strcmp(action, "add"))
+ swapon(path, m->prio);
+ else
+ swapoff(path);
+ } else {
+ m = find_block(pr->uuid, pr->label, NULL);
+ if (m && strcmp(m->target, "/")) {
+ int err = 0;
+
+ mkdir_p(m->target);
+ err = mount(path, m->target, pr->id->name, 0, (m->options) ? (m->options) : (""));
+ if (err)
+ fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
+ path, pr->id->name, m->target, err, strerror(err));
+ }
+ }
+
+ return 0;
+}
+
+static int find_block_mtd(char *name, char *part, int plen)
+{
+ FILE *fp = fopen("/proc/mtd", "r");
+ static char line[256];
+ char *index = NULL;
+
+ if(!fp)
+ return -1;
+
+ while (!index && fgets(line, sizeof(line), fp)) {
+ if (strstr(line, name)) {
+ char *eol = strstr(line, ":");
+
+ if (!eol)
+ continue;
+
+ *eol = '\0';
+ index = &line[3];
+ }
+ }
+
+ fclose(fp);
+
+ if (!index)
+ return -1;
+
+ snprintf(part, plen, "/dev/mtdblock%s", index);
+
+ return 0;
+}
+
+static int mount_extroot(char *path, char *cfg)
+{
+ struct blkid_struct_probe *pr;
+ struct mount *m;
+ int err = -1;
+
+ if (config_load(cfg))
+ return 2;
+
+ m = find_block(NULL, NULL, "/");
+ if (!m)
+ return 1;
+
+ pr = find_block_info(m->uuid, m->label, NULL);
+ if (pr) {
+ mkdir_p(path);
+ err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
+
+ if (err)
+ fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
+ pr->dev, pr->id->name, path, err, strerror(err));
+ }
+
+ return err;
+}
+
+static int main_extroot(int argc, char **argv)
+{
+ struct blkid_struct_probe *pr;
+ char fs[32] = { 0 };
+ char fs_data[32] = { 0 };
+ int err = 1;
+ char extroot[] = "/tmp/overlay";
+
+ if (!getenv("PREINIT"))
+ return -1;
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: block extroot mountpoint\n");
+ return 1;
+ }
+
+ mkblkdev();
+ cache_load(1);
+
+ find_block_mtd("rootfs", fs, sizeof(fs));
+ if (!fs[0])
+ return 2;
+
+ pr = find_block_info(NULL, NULL, fs);
+ if (!pr || strcmp(pr->id->name, "squashfs"))
+ return 3;
+
+ find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
+ if (fs_data[0]) {
+ pr = find_block_info(NULL, NULL, fs_data);
+ if (pr && !strcmp(pr->id->name, "jffs2")) {
+ char cfg[] = "/tmp/jffs_cfg";
+
+ mkdir_p(cfg);
+ if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
+ err = mount_extroot(extroot, cfg);
+ umount2(cfg, MNT_DETACH);
+ }
+ if (err)
+ rmdir(extroot);
+ rmdir(cfg);
+ return err;
+ }
+ }
+
+ err = mount_extroot(extroot, NULL);
+
+ return err;
+}
+
+static int main_detect(int argc, char **argv)
+{
+ struct blkid_struct_probe *pr;
+
+ cache_load(0);
+ list_for_each_entry(pr, &devices, list)
+ print_block_uci(pr);
+
+ return 0;
+}
+
+static int main_info(int argc, char **argv)
+{
+ int i;
+ struct blkid_struct_probe *pr;
+
+ cache_load(1);
+ if (argc == 2) {
+ list_for_each_entry(pr, &devices, list)
+ print_block_info(pr);
+
+ return 0;
+ };
+
+ for (i = 2; i < argc; i++) {
+ struct stat s;
+
+ if (stat(argv[i], &s)) {
+ fprintf(stderr, "failed to stat %s\n", argv[i]);
+ continue;
+ }
+ if (!S_ISBLK(s.st_mode)) {
+ fprintf(stderr, "%s is not a block device\n", argv[i]);
+ continue;
+ }
+ pr = find_block_info(NULL, NULL, argv[i]);
+ if (pr)
+ print_block_info(pr);
+ }
+
+ return 0;
+}
+
+static int main_swapon(int argc, char **argv)
+{
+ if (argc != 2) {
+ fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a Stop swapping on all swap devices\n");
+ return -1;
+ }
+
+ if (!strcmp(argv[1], "-a")) {
+ struct blkid_struct_probe *pr;
+
+ cache_load(0);
+ list_for_each_entry(pr, &devices, list) {
+ if (strcmp(pr->id->name, "swap"))
+ continue;
+ if (swapon(pr->dev, 0))
+ fprintf(stderr, "failed to swapon %s\n", pr->dev);
+ }
+ } else {
+ struct stat s;
+ int err;
+
+ if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
+ fprintf(stderr, "%s is not a block device\n", argv[1]);
+ return -1;
+ }
+ err = swapon(argv[1], 0);
+ if (err) {
+ fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int main_swapoff(int argc, char **argv)
+{
+ if (argc != 2) {
+ fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a Stop swapping on all swap devices\n");
+ return -1;
+ }
+
+ if (!strcmp(argv[1], "-a")) {
+ FILE *fp = fopen("/proc/swaps", "r");
+ char line[256];
+
+ if (!fp) {
+ fprintf(stderr, "failed to open /proc/swaps\n");
+ return -1;
+ }
+ fgets(line, sizeof(line), fp);
+ while (fgets(line, sizeof(line), fp)) {
+ char *end = strchr(line, ' ');
+ int err;
+
+ if (!end)
+ continue;
+ *end = '\0';
+ err = swapoff(line);
+ if (err)
+ fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
+ }
+ fclose(fp);
+ } else {
+ struct stat s;
+ int err;
+
+ if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
+ fprintf(stderr, "%s is not a block device\n", argv[1]);
+ return -1;
+ }
+ err = swapoff(argv[1]);
+ if (err) {
+ fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ char *base = basename(*argv);
+
+ if (!strcmp(base, "swapon"))
+ return main_swapon(argc, argv);
+
+ if (!strcmp(base, "swapoff"))
+ return main_swapoff(argc, argv);
+
+ if ((argc > 1) && !strcmp(base, "block")) {
+ if (!strcmp(argv[1], "info"))
+ return main_info(argc, argv);
+
+ if (!strcmp(argv[1], "detect"))
+ return main_detect(argc, argv);
+
+ if (!strcmp(argv[1], "hotplug"))
+ return main_hotplug(argc, argv);
+
+ if (!strcmp(argv[1], "extroot"))
+ return main_extroot(argc, argv);
+ }
+
+ fprintf(stderr, "Usage: block <info|detect>\n");
+
+ return -1;
+}
projects / oweals / ubox.git / commitdiff