251 lines
6.7 KiB
C
251 lines
6.7 KiB
C
/*
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* Copyright (c) 1997-2006 Erez Zadok
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* Copyright (c) 1989 Jan-Simon Pendry
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* Copyright (c) 1989 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* File: am-utils/libamu/mtab.c
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amu.h>
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/*
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* Firewall /etc/mtab entries
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*/
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void
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mnt_free(mntent_t *mp)
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{
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XFREE(mp->mnt_fsname);
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XFREE(mp->mnt_dir);
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XFREE(mp->mnt_type);
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XFREE(mp->mnt_opts);
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#ifdef HAVE_MNTENT_T_MNT_TIME
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# ifdef HAVE_MNTENT_T_MNT_TIME_STRING
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XFREE(mp->mnt_time);
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# endif /* HAVE_MNTENT_T_MNT_TIME_STRING */
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#endif /* HAVE_MNTENT_T_MNT_TIME */
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XFREE(mp);
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}
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/*
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* Discard memory allocated for mount list
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*/
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void
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discard_mntlist(mntlist *mp)
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{
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mntlist *mp2;
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while ((mp2 = mp)) {
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mp = mp->mnext;
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if (mp2->mnt)
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mnt_free(mp2->mnt);
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XFREE(mp2);
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}
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}
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/*
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* Throw away a mount list
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*/
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void
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free_mntlist(mntlist *mp)
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{
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discard_mntlist(mp);
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#ifdef MOUNT_TABLE_ON_FILE
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unlock_mntlist();
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#endif /* MOUNT_TABLE_ON_FILE */
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}
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/*
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* Utility routine which returns a pointer to whatever follows an = in a
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* string. Returns null if = is not found in the string.
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*/
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char *
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haseq(char *instr)
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{
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if (instr) {
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char *eq = strchr(instr, '=');
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if (eq) return ++eq;
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}
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return NULL;
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}
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/*
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* Utility routine which returns a pointer to whatever
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* follows an = in a mount option. Returns null if option
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* doesn't exist or doesn't have an '='. Won't fail for opt,foo=.
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*/
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char *
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hasmnteq(mntent_t *mnt, char *opt)
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{
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if (mnt && opt) { /* disallow null input pointers */
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if ( *opt ) { /* disallow the null string as an opt */
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char *str = amu_hasmntopt(mnt, opt);
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if ( str ) { /* option was there */
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char *eq = str + strlen(opt); /* Look at char just after option */
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if (*eq == '=') /* Is it '=' ? */
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return ++eq; /* If so, return pointer to remaining str */
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}
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}
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}
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return NULL;
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}
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/*
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* Wrapper around hasmntvalerr(), which retains backwards compatibiliy with
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* older use of hasmntval().
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*
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* XXX: eventually, all use of hasmntval() should be replaced with
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* hasmntvalerr().
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*/
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int
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hasmntval(mntent_t *mnt, char *opt)
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{
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int err, val = 0;
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err = hasmntvalerr(mnt, opt, &val);
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if (err) /* if there was an error (hasmntvalerr returned 1) */
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return 0; /* redundant: val==0 above, but leave here for clarity */
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/* otherwise there was no error */
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return val;
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}
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/*
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* Utility routine which determines the value of a numeric option in the
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* mount options (such as port=%d), and fills in the value in the argument
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* valp (argument won't be touched if no value is set, for example due to an
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* error).
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*
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* Returns non-zero (1) on error; returns 0 on success.
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*
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* XXX: eventually, all use of hasmntval() should be replaced with
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* hasmntvalerr().
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*/
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unsigned int
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hasmntvalerr(mntent_t *mnt, char *opt, int *valp)
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{
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char *str = amu_hasmntopt(mnt, opt);
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int err = 1; /* 1 means no good value was set (an error) */
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char *eq, *endptr;
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long int i;
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/* exit if no option specificed */
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if (!str) {
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goto out;
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}
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eq = hasmnteq(mnt, opt);
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if (!eq) { /* no argument to option ('=' sign was missing) */
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plog(XLOG_MAP, "numeric option to \"%s\" missing", opt);
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goto out;
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}
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/* if got here, then we had an '=' after option name */
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endptr = NULL;
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i = strtol(eq, &endptr, 0); /* hex and octal allowed ;-) */
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if (!endptr ||
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(endptr != eq && (*endptr == ',' || *endptr == '\0'))) {
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/*
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* endptr set means strtol saw a non-digit. If the non-digit is a
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* comma, it's probably the start of the next option. If the comma is
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* the first char though, complain about it (foo=,bar is made
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* noticeable by this).
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*
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* Similar reasoning for '\0' instead of comma, it's the end of the
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* string.
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*/
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*valp = (int) i; /* set good value */
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err = 0; /* no error */
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} else {
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/* whatever was after the '=' sign wasn't a number */
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plog(XLOG_MAP, "invalid numeric option in \"%s\": \"%s\"", opt, str);
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/* fall through to error/exit processing */
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}
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out:
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return err;
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}
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/*
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* Utility routine which returns the string value of
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* an option in the mount options (such as proto=udp).
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* Returns NULL if the option is not specified.
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* Returns malloc'ed string (caller must free!)
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*/
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char *
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hasmntstr(mntent_t *mnt, char *opt)
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{
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char *str = amu_hasmntopt(mnt, opt);
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if (str) { /* The option was there */
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char *eq = hasmnteq(mnt, opt);
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if (eq) { /* and had an = after it */
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char *endptr = strchr(eq, ',');
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/* if saw no comma, return strdup'd string */
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if (!endptr)
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return strdup(eq);
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else {
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/* else we need to copy only the chars needed */
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int len = endptr - eq;
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char *buf = xmalloc(len + 1);
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strncpy(buf, eq, len);
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buf[len] = '\0';
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return buf;
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}
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}
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}
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return NULL;
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}
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