/*
* Copyright (C) 2015 John Crispin <blogic@openwrt.org>
* Copyright (C) 2015 Etienne Champetier <champetier.etienne@gmail.com>
+ * Copyright (C) 2020 Daniel Golle <daniel@makrotopia.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
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
+#include <libgen.h>
#include <libubox/avl.h>
#include <libubox/avl-cmp.h>
+#include <libubox/blobmsg.h>
+#include <libubox/list.h>
#include "elf.h"
#include "fs.h"
#include "log.h"
struct mount {
- struct avl_node avl;
- const char *path;
- int readonly;
- int error;
+ struct avl_node avl;
+ const char *source;
+ const char *target;
+ const char *filesystemtype;
+ unsigned long mountflags;
+ const char *optstr;
+ int error;
};
struct avl_tree mounts;
-int add_mount(const char *path, int readonly, int error)
+int mkdir_p(char *dir, mode_t mask)
{
- assert(path != NULL);
+ char *l = strrchr(dir, '/');
+ int ret;
+
+ if (!l)
+ return 0;
+
+ *l = '\0';
+
+ if (mkdir_p(dir, mask))
+ return -1;
+
+ *l = '/';
+
+ ret = mkdir(dir, mask);
+ if (ret && errno == EEXIST)
+ return 0;
+
+ if (ret)
+ ERROR("mkdir(%s, %d) failed: %m\n", dir, mask);
+
+ return ret;
+}
+
+static int do_mount(const char *root, const char *source, const char *target, const char *filesystemtype,
+ unsigned long orig_mountflags, const char *optstr, int error)
+{
+ struct stat s;
+ char new[PATH_MAX];
+ int fd;
+ bool is_bind = (orig_mountflags & MS_BIND);
+ unsigned long mountflags = orig_mountflags;
+
+ if (is_bind && stat(source, &s)) {
+ ERROR("stat(%s) failed: %m\n", source);
+ return error;
+ }
+
+ snprintf(new, sizeof(new), "%s%s", root, target?target:source);
+
+ if (!is_bind || S_ISDIR(s.st_mode)) {
+ mkdir_p(new, 0755);
+ } else {
+ mkdir_p(dirname(new), 0755);
+ snprintf(new, sizeof(new), "%s%s", root, target?target:source);
+ fd = creat(new, 0644);
+ if (fd == -1) {
+ ERROR("creat(%s) failed: %m\n", new);
+ return -1;
+ }
+ close(fd);
+ }
- if (avl_find(&mounts, path))
+ if (mountflags & MS_BIND) {
+ if (mount(source, new, filesystemtype, MS_BIND, optstr)) {
+ ERROR("failed to mount -B %s %s: %m\n", source, new);
+ }
+ mountflags |= MS_REMOUNT;
+ }
+
+ if (mount(source, new, filesystemtype, mountflags, optstr)) {
+ ERROR("failed to mount %s %s: %m\n", source, new);
+ return -1;
+ }
+
+ DEBUG("mount %s%s %s (%s)\n", (mountflags & MS_BIND)?"-B ":"", source, new,
+ (mountflags & MS_RDONLY)?"ro":"rw");
+
+ return 0;
+}
+
+int add_mount(const char *source, const char *target, const char *filesystemtype,
+ unsigned long mountflags, const char *optstr, int error)
+{
+ assert(target != NULL);
+
+ if (avl_find(&mounts, target))
return 1;
struct mount *m;
m = calloc(1, sizeof(struct mount));
assert(m != NULL);
- m->avl.key = m->path = strdup(path);
- m->readonly = readonly;
+ m->avl.key = m->target = strdup(target);
+ if (source)
+ m->source = strdup(source);
+ if (filesystemtype)
+ m->filesystemtype = strdup(filesystemtype);
+ m->mountflags = mountflags;
m->error = error;
avl_insert(&mounts, &m->avl);
- DEBUG("adding mount %s ro(%d) err(%d)\n", m->path, m->readonly, m->error != 0);
+ DEBUG("adding mount %s %s bind(%d) ro(%d) err(%d)\n", m->source, m->target,
+ !!(m->mountflags & MS_BIND), !!(m->mountflags & MS_RDONLY), m->error != 0);
+
return 0;
}
+int add_mount_bind(const char *path, int readonly, int error)
+{
+ unsigned long mountflags = MS_BIND;
+
+ if (readonly)
+ mountflags |= MS_RDONLY;
+
+ return add_mount(path, path, NULL, mountflags, NULL, error);
+}
+
+
+enum {
+ OCI_MOUNT_SOURCE,
+ OCI_MOUNT_DESTINATION,
+ OCI_MOUNT_TYPE,
+ OCI_MOUNT_OPTIONS,
+ __OCI_MOUNT_MAX,
+};
+
+static const struct blobmsg_policy oci_mount_policy[] = {
+ [OCI_MOUNT_SOURCE] = { "source", BLOBMSG_TYPE_STRING },
+ [OCI_MOUNT_DESTINATION] = { "destination", BLOBMSG_TYPE_STRING },
+ [OCI_MOUNT_TYPE] = { "type", BLOBMSG_TYPE_STRING },
+ [OCI_MOUNT_OPTIONS] = { "options", BLOBMSG_TYPE_ARRAY },
+};
+
+struct mount_opt {
+ struct list_head list;
+ char *optstr;
+};
+
+static int parseOCImountopts(struct blob_attr *msg, unsigned long *mount_flags, char **mount_data, int *error)
+{
+ struct blob_attr *cur;
+ int rem;
+ unsigned long mf = 0;
+ char *tmp;
+ struct list_head fsopts = LIST_HEAD_INIT(fsopts);
+ size_t len = 0;
+ struct mount_opt *opt;
+
+ blobmsg_for_each_attr(cur, msg, rem) {
+ tmp = blobmsg_get_string(cur);
+ if (!strcmp("ro", tmp))
+ mf |= MS_RDONLY;
+ else if (!strcmp("rw", tmp))
+ mf &= ~MS_RDONLY;
+ else if (!strcmp("bind", tmp))
+ mf = MS_BIND;
+ else if (!strcmp("rbind", tmp))
+ mf |= MS_BIND | MS_REC;
+ else if (!strcmp("sync", tmp))
+ mf |= MS_SYNCHRONOUS;
+ else if (!strcmp("async", tmp))
+ mf &= ~MS_SYNCHRONOUS;
+ else if (!strcmp("atime", tmp))
+ mf &= ~MS_NOATIME;
+ else if (!strcmp("noatime", tmp))
+ mf |= MS_NOATIME;
+ else if (!strcmp("defaults", tmp))
+ mf = 0; /* rw, suid, dev, exec, auto, nouser, and async */
+ else if (!strcmp("dev", tmp))
+ mf &= ~MS_NODEV;
+ else if (!strcmp("nodev", tmp))
+ mf |= MS_NODEV;
+ else if (!strcmp("diratime", tmp))
+ mf &= ~MS_NODIRATIME;
+ else if (!strcmp("nodiratime", tmp))
+ mf |= MS_NODIRATIME;
+ else if (!strcmp("dirsync", tmp))
+ mf |= MS_DIRSYNC;
+ else if (!strcmp("exec", tmp))
+ mf &= ~MS_NOEXEC;
+ else if (!strcmp("noexec", tmp))
+ mf |= MS_NOEXEC;
+ else if (!strcmp("mand", tmp))
+ mf |= MS_MANDLOCK;
+ else if (!strcmp("nomand", tmp))
+ mf &= ~MS_MANDLOCK;
+ else if (!strcmp("relatime", tmp))
+ mf |= MS_RELATIME;
+ else if (!strcmp("norelatime", tmp))
+ mf &= ~MS_RELATIME;
+ else if (!strcmp("strictatime", tmp))
+ mf |= MS_STRICTATIME;
+ else if (!strcmp("nostrictatime", tmp))
+ mf &= ~MS_STRICTATIME;
+ else if (!strcmp("lazytime", tmp))
+ mf |= MS_LAZYTIME;
+ else if (!strcmp("nostrictatime", tmp))
+ mf &= ~MS_LAZYTIME;
+ else if (!strcmp("suid", tmp))
+ mf &= ~MS_NOSUID;
+ else if (!strcmp("nosuid", tmp))
+ mf |= MS_NOSUID;
+ else if (!strcmp("remount", tmp))
+ mf |= MS_REMOUNT;
+ else if(!strcmp("nofail", tmp))
+ *error = 0;
+ else if (!strcmp("auto", tmp) ||
+ !strcmp("noauto", tmp) ||
+ !strcmp("user", tmp) ||
+ !strcmp("group", tmp) ||
+ !strcmp("_netdev", tmp))
+ DEBUG("ignoring built-in mount option %s\n", tmp);
+ else {
+ /* filesystem-specific free-form option */
+ opt = calloc(1, sizeof(*opt));
+ opt->optstr = tmp;
+ list_add_tail(&opt->list, &fsopts);
+ }
+ };
+
+ *mount_flags = mf;
+
+ list_for_each_entry(opt, &fsopts, list) {
+ if (len)
+ ++len;
+
+ len += strlen(opt->optstr);
+ };
+
+ if (!len)
+ return 0;
+
+ *mount_data = calloc(len + 1, sizeof(char));
+ if (!mount_data)
+ return ENOMEM;
+
+ len = 0;
+ list_for_each_entry(opt, &fsopts, list) {
+ if (len)
+ strcat(*mount_data, ",");
+
+ strcat(*mount_data, opt->optstr);
+ ++len;
+ };
+
+ list_del(&fsopts);
+
+ DEBUG("mount flags(%08lx) fsopts(\"%s\")\n", mf, *mount_data?:"");
+
+ return 0;
+};
+
+int parseOCImount(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_MOUNT_MAX];
+ unsigned long mount_flags = 0;
+ char *mount_data = NULL;
+ int ret, err = -1;
+
+ blobmsg_parse(oci_mount_policy, __OCI_MOUNT_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (!tb[OCI_MOUNT_DESTINATION])
+ return EINVAL;
+
+ if (tb[OCI_MOUNT_OPTIONS]) {
+ ret = parseOCImountopts(tb[OCI_MOUNT_OPTIONS], &mount_flags, &mount_data, &err);
+ if (ret)
+ return ret;
+ }
+
+ add_mount(tb[OCI_MOUNT_SOURCE] ? blobmsg_get_string(tb[OCI_MOUNT_SOURCE]) : NULL,
+ blobmsg_get_string(tb[OCI_MOUNT_DESTINATION]),
+ tb[OCI_MOUNT_TYPE] ? blobmsg_get_string(tb[OCI_MOUNT_TYPE]) : NULL,
+ mount_flags, mount_data, err);
+
+ return 0;
+};
+
+
int mount_all(const char *jailroot) {
struct library *l;
struct mount *m;
avl_for_each_element(&libraries, l, avl)
- add_mount(l->path, 1, -1);
+ add_mount_bind(l->path, 1, -1);
avl_for_each_element(&mounts, m, avl)
- if (mount_bind(jailroot, m->path, m->readonly, m->error))
+ if (do_mount(jailroot, m->source, m->target, m->filesystemtype, m->mountflags, m->optstr, m->error))
return -1;
return 0;
fd = open(path, O_RDONLY|O_CLOEXEC);
if (fd == -1)
return error;
- add_mount(path, readonly, error);
+ add_mount_bind(path, readonly, error);
} else {
if (avl_find(&libraries, path))
return 0;
projects / project / procd.git / blobdiff