1 files changed, 388 insertions, 0 deletions

diff --git a/fuse/mount_bsd.c b/fuse/mount_bsd.c
new file mode 100644
index 000000000..62443ac25
--- /dev/null
+++ b/fuse/mount_bsd.c
@@ -0,0 +1,388 @@
+/*
+  FUSE: Filesystem in Userspace
+  Copyright (C) 2005-2008 Csaba Henk <csaba.henk@creo.hu>
+
+  This program can be distributed under the terms of the GNU LGPLv2.
+  See the file COPYING.LIB.
+*/
+
+#include "fuse_i.h"
+#include "fuse_misc.h"
+#include "fuse_opt.h"
+
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <paths.h>
+#include <limits.h>
+
+#define FUSERMOUNT_PROG		"mount_fusefs"
+#define FUSE_DEV_TRUNK		"/dev/fuse"
+
+enum {
+	KEY_ALLOW_ROOT,
+	KEY_RO,
+	KEY_HELP,
+	KEY_VERSION,
+	KEY_KERN
+};
+
+struct mount_opts {
+	int allow_other;
+	int allow_root;
+	int ishelp;
+	char *kernel_opts;
+};
+
+#define FUSE_DUAL_OPT_KEY(templ, key) 				\
+	FUSE_OPT_KEY(templ, key), FUSE_OPT_KEY("no" templ, key)
+
+static const struct fuse_opt fuse_mount_opts[] = {
+	{ "allow_other", offsetof(struct mount_opts, allow_other), 1 },
+	{ "allow_root", offsetof(struct mount_opts, allow_root), 1 },
+	FUSE_OPT_KEY("allow_root",		KEY_ALLOW_ROOT),
+	FUSE_OPT_KEY("-r",			KEY_RO),
+	FUSE_OPT_KEY("-h",			KEY_HELP),
+	FUSE_OPT_KEY("--help",			KEY_HELP),
+	FUSE_OPT_KEY("-V",			KEY_VERSION),
+	FUSE_OPT_KEY("--version",		KEY_VERSION),
+	/* standard FreeBSD mount options */
+	FUSE_DUAL_OPT_KEY("dev",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("async",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("atime",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("dev",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("exec",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("suid",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("symfollow",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("rdonly",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("sync",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("union",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("userquota",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("groupquota",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("clusterr",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("clusterw",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("suiddir",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("snapshot",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("multilabel",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("acls",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("force",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("update",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("ro",			KEY_KERN),
+	FUSE_DUAL_OPT_KEY("rw",			KEY_KERN),
+	FUSE_DUAL_OPT_KEY("auto",		KEY_KERN),
+	/* options supported under both Linux and FBSD */
+	FUSE_DUAL_OPT_KEY("allow_other",	KEY_KERN),
+	FUSE_DUAL_OPT_KEY("default_permissions",KEY_KERN),
+	FUSE_OPT_KEY("max_read=",		KEY_KERN),
+	FUSE_OPT_KEY("subtype=",		KEY_KERN),
+	/* FBSD FUSE specific mount options */
+	FUSE_DUAL_OPT_KEY("private",		KEY_KERN),
+	FUSE_DUAL_OPT_KEY("neglect_shares",	KEY_KERN),
+	FUSE_DUAL_OPT_KEY("push_symlinks_in",	KEY_KERN),
+	FUSE_OPT_KEY("nosync_unmount",		KEY_KERN),
+	/* stock FBSD mountopt parsing routine lets anything be negated... */
+	/*
+	 * Linux specific mount options, but let just the mount util
+	 * handle them
+	 */
+	FUSE_OPT_KEY("fsname=",			KEY_KERN),
+	FUSE_OPT_KEY("nonempty",		KEY_KERN),
+	FUSE_OPT_KEY("large_read",		KEY_KERN),
+	FUSE_OPT_END
+};
+
+static void mount_help(void)
+{
+	fprintf(stderr,
+		"    -o allow_root          allow access to root\n"
+		);
+	system(FUSERMOUNT_PROG " --help");
+	fputc('\n', stderr);
+}
+
+static void mount_version(void)
+{
+	system(FUSERMOUNT_PROG " --version");
+}
+
+static int fuse_mount_opt_proc(void *data, const char *arg, int key,
+			       struct fuse_args *outargs)
+{
+	struct mount_opts *mo = data;
+
+	switch (key) {
+	case KEY_ALLOW_ROOT:
+		if (fuse_opt_add_opt(&mo->kernel_opts, "allow_other") == -1 ||
+		    fuse_opt_add_arg(outargs, "-oallow_root") == -1)
+			return -1;
+		return 0;
+
+	case KEY_RO:
+		arg = "ro";
+		/* fall through */
+
+	case KEY_KERN:
+		return fuse_opt_add_opt(&mo->kernel_opts, arg);
+
+	case KEY_HELP:
+		mount_help();
+		mo->ishelp = 1;
+		break;
+
+	case KEY_VERSION:
+		mount_version();
+		mo->ishelp = 1;
+		break;
+	}
+	return 1;
+}
+
+void fuse_unmount_compat22(const char *mountpoint)
+{
+	char dev[128];
+	char *ssc, *umount_cmd;
+	FILE *sf;
+	int rv;
+	char seekscript[] =
+		/* error message is annoying in help output */
+		"exec 2>/dev/null; "
+		"/usr/bin/fstat " FUSE_DEV_TRUNK "* | "
+		"/usr/bin/awk 'BEGIN{ getline; if (! ($3 == \"PID\" && $10 == \"NAME\")) exit 1; }; "
+		"              { if ($3 == %d) print $10; }' | "
+		"/usr/bin/sort | "
+		"/usr/bin/uniq | "
+		"/usr/bin/awk '{ i += 1; if (i > 1){ exit 1; }; printf; }; END{ if (i == 0) exit 1; }'";
+
+	(void) mountpoint;
+
+	/*
+	 * If we don't know the fd, we have to resort to the scripted
+	 * solution -- iterating over the fd-s is unpractical, as we
+	 * don't know how many of open files we have. (This could be
+	 * looked up in procfs -- however, that's optional on FBSD; or
+	 * read out from the kmem -- however, that's bound to
+	 * privileges (in fact, that's what happens when we call the
+	 * setgid kmem fstat(1) utility).
+	 */
+	if (asprintf(&ssc, seekscript, getpid()) == -1)
+		return;
+
+	errno = 0;
+	sf = popen(ssc, "r");
+	free(ssc);
+	if (! sf)
+		return;
+
+	fgets(dev, sizeof(dev), sf);
+	rv = pclose(sf);
+	if (rv)
+		return;
+
+	if (asprintf(&umount_cmd, "/sbin/umount %s", dev) == -1)
+		return;
+	system(umount_cmd);
+	free(umount_cmd);
+}
+
+static void do_unmount(char *dev, int fd)
+{
+	char device_path[SPECNAMELEN + 12];
+	const char *argv[4];
+	const char umount_cmd[] = "/sbin/umount";
+	pid_t pid;
+
+	snprintf(device_path, SPECNAMELEN + 12, _PATH_DEV "%s", dev);
+
+	argv[0] = umount_cmd;
+	argv[1] = "-f";
+	argv[2] = device_path;
+	argv[3] = NULL;
+
+	pid = fork();
+
+	if (pid == -1)
+		return;
+
+	if (pid == 0) {
+		close(fd);
+		execvp(umount_cmd, (char **)argv);
+		exit(1);
+	}
+
+	waitpid(pid, NULL, 0);
+}
+
+void fuse_kern_unmount(const char *mountpoint, int fd)
+{
+	char *ep, dev[128];
+	struct stat sbuf;
+
+	(void)mountpoint;
+
+	if (fstat(fd, &sbuf) == -1)
+		return;
+
+	devname_r(sbuf.st_rdev, S_IFCHR, dev, 128);
+
+	if (strncmp(dev, "fuse", 4))
+		return;
+
+	strtol(dev + 4, &ep, 10);
+	if (*ep != '\0')
+		return;
+
+	do_unmount(dev, fd);
+}
+
+/* Check if kernel is doing init in background */
+static int init_backgrounded(void)
+{
+	unsigned ibg, len;
+
+	len = sizeof(ibg);
+
+	if (sysctlbyname("vfs.fuse.init_backgrounded", &ibg, &len, NULL, 0))
+		return 0;
+
+	return ibg;
+}
+
+
+static int fuse_mount_core(const char *mountpoint, const char *opts)
+{
+	const char *mountprog = FUSERMOUNT_PROG;
+	int fd;
+	char *fdnam, *dev;
+	pid_t pid, cpid;
+	int status;
+
+	fdnam = getenv("FUSE_DEV_FD");
+
+	if (fdnam) {
+		char *ep;
+
+		fd = strtol(fdnam, &ep, 10);
+
+		if (*ep != '\0') {
+			fprintf(stderr, "invalid value given in FUSE_DEV_FD\n");
+			return -1;
+		}
+
+		if (fd < 0)
+			return -1;
+
+		goto mount;
+	}
+
+	dev = getenv("FUSE_DEV_NAME");
+
+	if (! dev)
+		dev = (char *)FUSE_DEV_TRUNK;
+
+	if ((fd = open(dev, O_RDWR)) < 0) {
+		perror("fuse: failed to open fuse device");
+		return -1;
+	}
+
+mount:
+	if (getenv("FUSE_NO_MOUNT") || ! mountpoint)
+		goto out;
+
+	pid = fork();
+	cpid = pid;
+
+	if (pid == -1) {
+		perror("fuse: fork() failed");
+		close(fd);
+		return -1;
+	}
+
+	if (pid == 0) {
+		if (! init_backgrounded()) {
+			/*
+			 * If init is not backgrounded, we have to
+			 * call the mount util backgrounded, to avoid
+			 * deadlock.
+			 */
+
+			pid = fork();
+
+			if (pid == -1) {
+				perror("fuse: fork() failed");
+				close(fd);
+				exit(1);
+			}
+		}
+
+		if (pid == 0) {
+			const char *argv[32];
+			int a = 0;
+
+			if (! fdnam && asprintf(&fdnam, "%d", fd) == -1) {
+				perror("fuse: failed to assemble mount arguments");
+				exit(1);
+			}
+
+			argv[a++] = mountprog;
+			if (opts) {
+				argv[a++] = "-o";
+				argv[a++] = opts;
+			}
+			argv[a++] = fdnam;
+			argv[a++] = mountpoint;
+			argv[a++] = NULL;
+			execvp(mountprog, (char **) argv);
+			perror("fuse: failed to exec mount program");
+			exit(1);
+		}
+
+		exit(0);
+	}
+
+	if (waitpid(cpid, &status, 0) == -1 || WEXITSTATUS(status) != 0) {
+		perror("fuse: failed to mount file system");
+		close(fd);
+		return -1;
+	}
+
+out:
+	return fd;
+}
+
+int fuse_kern_mount(const char *mountpoint, struct fuse_args *args)
+{
+	struct mount_opts mo;
+	int res = -1;
+
+	memset(&mo, 0, sizeof(mo));
+	/* mount util should not try to spawn the daemon */
+	setenv("MOUNT_FUSEFS_SAFE", "1", 1);
+	/* to notify the mount util it's called from lib */
+	setenv("MOUNT_FUSEFS_CALL_BY_LIB", "1", 1);
+
+	if (args &&
+	    fuse_opt_parse(args, &mo, fuse_mount_opts, fuse_mount_opt_proc) == -1)
+		return -1;
+
+	if (mo.allow_other && mo.allow_root) {
+		fprintf(stderr, "fuse: 'allow_other' and 'allow_root' options are mutually exclusive\n");
+		goto out;
+	}
+	if (mo.ishelp)
+		return 0;
+
+	res = fuse_mount_core(mountpoint, mo.kernel_opts);
+out:
+	free(mo.kernel_opts);
+	return res;
+}
+
+FUSE_SYMVER(".symver fuse_unmount_compat22,fuse_unmount@FUSE_2.2");