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getmntopts.c

/*-
 * Copyright (c) 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if 0
#ifndef lint
static char sccsid[] = "@(#)getmntopts.c  8.3 (Berkeley) 3/29/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sbin/mount/getmntopts.c,v 1.18 2005/11/14 17:39:00 rodrigc Exp $");

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/uio.h>

#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>

#include "mntopts.h"

int getmnt_silent = 0;

void
getmntopts(const char *options, const struct mntopt *m0, int *flagp,
      int *altflagp)
{
      const struct mntopt *m;
      int negative, len;
      char *opt, *optbuf, *p;
      int *thisflagp;

      /* Copy option string, since it is about to be torn asunder... */
      if ((optbuf = strdup(options)) == NULL)
            err(1, NULL);

      for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
            /* Check for "no" prefix. */
            if (opt[0] == 'n' && opt[1] == 'o') {
                  negative = 1;
                  opt += 2;
            } else
                  negative = 0;

            /*
             * for options with assignments in them (ie. quotas)
             * ignore the assignment as it's handled elsewhere
             */
            p = strchr(opt, '=');
            if (p != NULL)
                   *++p = '\0';

            /* Scan option table. */
            for (m = m0; m->m_option != NULL; ++m) {
                  len = strlen(m->m_option);
                  if (strncasecmp(opt, m->m_option, len) == 0)
                        if (opt[len] == '\0' || opt[len] == '=')
                              break;
            }

            /* Save flag, or fail if option is not recognized. */
            if (m->m_option) {
                  thisflagp = m->m_altloc ? altflagp : flagp;
                  if (negative == m->m_inverse)
                        *thisflagp |= m->m_flag;
                  else
                        *thisflagp &= ~m->m_flag;
            } else if (!getmnt_silent) {
                  errx(1, "-o %s: option not supported", opt);
            }
      }

      free(optbuf);
}

void
rmslashes(char *rrpin, char *rrpout)
{
      char *rrpoutstart;

      *rrpout = *rrpin;
      for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {

            /* skip all double slashes */
            while (*rrpin == '/' && *(rrpin + 1) == '/')
                   rrpin++;
      }

      /* remove trailing slash if necessary */
      if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
            *(rrpout - 1) = '\0';
      else
            *rrpout = '\0';
}

void
checkpath(const char *path, char *resolved)
{
      struct stat sb;

      if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
            if (!S_ISDIR(sb.st_mode)) 
                  errx(EX_USAGE, "%s: not a directory", resolved);
      } else
            errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
}

void
build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val,
          size_t len)
{
      int i;

      if (*iovlen < 0)
            return;
      i = *iovlen;
      *iov = realloc(*iov, sizeof **iov * (i + 2));
      if (*iov == NULL) {
            *iovlen = -1;
            return;
      }
      (*iov)[i].iov_base = strdup(name);
      (*iov)[i].iov_len = strlen(name) + 1;
      i++;
      (*iov)[i].iov_base = val;
      if (len == (size_t)-1) {
            if (val != NULL)
                  len = strlen(val) + 1;
            else
                  len = 0;
      }
      (*iov)[i].iov_len = (int)len;
      *iovlen = ++i;
}

/*
 * This function is needed for compatibility with parameters
 * which used to use the mount_argf() command for the old mount() syscall.
 */
void
build_iovec_argf(struct iovec **iov, int *iovlen, const char *name,
    const char *fmt, ...)
{
      va_list ap;
      char val[255] = { 0 };

      va_start(ap, fmt);
      vsnprintf(val, sizeof(val), fmt, ap);  
      va_end(ap);
      build_iovec(iov, iovlen, name, strdup(val), (size_t)-1);
}

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