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/*********************************************************
* Copyright (C) 2011-2015 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* vmblockmounter.c --
*
* Helper app for mounting vmblock filesystem on FreeBSD and Solaris.
* Linux does not need it as it knows how to mount pseudo-filesystems
* without a helper program.
*/
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#if defined(__FreeBSD__)
# include <sys/uio.h>
# include <sys/param.h>
#endif
#include <sys/mount.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "vm_basic_types.h"
#include "vm_basic_defs.h"
#include "vm_assert.h"
#include "vmblock.h"
#include "vmblockmounter_version.h"
#include "vm_version.h"
#include "embed_version.h"
VM_EMBED_VERSION(VMBLOCKMOUNTER_VERSION_STRING);
#define LOG(format, ...) (beVerbose ? printf(format, ##__VA_ARGS__) : 0)
static char *thisProgram;
static char *thisProgramBase;
static Bool beVerbose = FALSE;
/*
*-----------------------------------------------------------------------------
*
* PrintVersion --
*
* Displays version.
*
* Results:
* None.
*
* Side effects:
* None.
*
*-----------------------------------------------------------------------------
*/
static void
PrintVersion(void)
{
printf("%s version: %s\n", thisProgramBase, VMBLOCKMOUNTER_VERSION_STRING);
}
/*
*-----------------------------------------------------------------------------
*
* PrintUsage --
*
* Displays usage for the vmblock mounting utility.
*
* Results:
* None.
*
* Side effects:
* None.
*
*-----------------------------------------------------------------------------
*/
static void
PrintUsage(FILE *fd) // IN: File stream to use for output
{
fprintf(fd, "Usage: %s <source> <dir> [-o <options>]\n", thisProgramBase);
fprintf(fd, "Mount the vmblock filesystem at given mount point.\n");
fprintf(fd, "\n");
fprintf(fd, "This command is intended to be run from within /bin/mount by\n");
fprintf(fd, "passing the option '-t %s'. For example:\n", VMBLOCK_FS_NAME);
fprintf(fd, " mount -t %s /tmp/VMwareDnD /var/run/vmblock\n",
VMBLOCK_FS_NAME);
}
/*-----------------------------------------------------------------------------
*
* main --
*
* Main entry point. Parses the mount options received, makes a call to
* mount(2), and handles the results.
*
* Results:
* Zero on success, non-zero on failure.
*
* Side effects:
* May mount a vmblock filesystem.
*
*-----------------------------------------------------------------------------
*/
int
main(int argc, // IN
char *argv[]) // IN
{
char c;
int i;
int result = EXIT_FAILURE;
int mntRes = -1;
struct stat statBuf;
char *sourceDir;
char *mountPoint;
thisProgram = argv[0];
/* Compute the base name of the program, too. */
thisProgramBase = strrchr(thisProgram, '/');
if (thisProgramBase != NULL) {
thisProgramBase++;
} else {
thisProgramBase = thisProgram;
}
while ((c = getopt(argc, argv, "hvV")) != -1) {
switch (c) {
case 'h':
PrintUsage(stdout);
result = EXIT_SUCCESS;
goto out;
case 'v':
beVerbose = TRUE;
break;
case 'V':
PrintVersion();
result = EXIT_SUCCESS;
goto out;
case '?':
default:
PrintUsage(stderr);
goto out;
}
}
LOG("Original command line: \"%s", thisProgram);
for (i = 1; i < argc; i++) {
LOG(" %s", argv[i]);
}
LOG("\"\n");
/* After getopt_long(3), optind is the first non-option argument. */
if (argc != optind + 2) {
fprintf(stderr, "Error: invalid number of arguments\n");
PrintUsage(stderr);
goto out;
}
sourceDir = argv[optind];
mountPoint = argv[optind + 1];
/* Do some sanity checks on our desired mount point. */
if (stat(mountPoint, &statBuf)) {
perror("Error: cannot stat mount point");
goto out;
}
if (S_ISDIR(statBuf.st_mode) == 0) {
fprintf(stderr,
"Error: mount point \"%s\" is not a directory\n", mountPoint);
goto out;
}
if (access(mountPoint, X_OK) < 0) {
fprintf(stderr,
"Error: no access rights to mount point \"%s\"\n", mountPoint);
goto out;
}
/* Do the same checks on the source directory. */
if (stat(sourceDir, &statBuf)) {
perror("Error: cannot stat source directory");
goto out;
}
if (S_ISDIR(statBuf.st_mode) == 0) {
fprintf(stderr, "Error: source \"%s\" is not a directory\n", sourceDir);
goto out;
}
if (access(sourceDir, X_OK) < 0) {
fprintf(stderr, "Error: no access rights to source \"%s\"\n", sourceDir);
goto out;
}
/* Go! */
#if defined(sun)
mntRes = mount(sourceDir, mountPoint, MS_DATA, VMBLOCK_FS_NAME);
#elif defined(__FreeBSD__)
{
struct iovec iov[] = {
{ .iov_base = "fstype", .iov_len = sizeof "fstype" },
{ .iov_base = VMBLOCK_FS_NAME, .iov_len = sizeof VMBLOCK_FS_NAME },
{ .iov_base = "fspath", .iov_len = sizeof "fspath" },
{ .iov_base = mountPoint, .iov_len = strlen(mountPoint) + 1 },
{ .iov_base = "target", .iov_len = sizeof "target" },
{ .iov_base = sourceDir, .iov_len = strlen(sourceDir) + 1 }
};
mntRes = nmount(iov, ARRAYSIZE(iov), MNT_NOSUID);
}
#else
#error "Unsupported OS"
#endif
if (mntRes) {
perror("Error: cannot mount filesystem");
goto out;
}
result = EXIT_SUCCESS;
out:
return result;
}
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