/* $NetBSD: mtab.c,v 1.1.1.3 2015/01/17 16:34:18 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1989 Jan-Simon Pendry * Copyright (c) 1989 Imperial College of Science, Technology & Medicine * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * 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. * 3. 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. * * * File: am-utils/libamu/mtab.c * */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /* * Firewall /etc/mtab entries */ void mnt_free(mntent_t *mp) { XFREE(mp->mnt_fsname); XFREE(mp->mnt_dir); XFREE(mp->mnt_type); XFREE(mp->mnt_opts); #ifdef HAVE_MNTENT_T_MNT_TIME # ifdef HAVE_MNTENT_T_MNT_TIME_STRING XFREE(mp->mnt_time); # endif /* HAVE_MNTENT_T_MNT_TIME_STRING */ #endif /* HAVE_MNTENT_T_MNT_TIME */ XFREE(mp); } /* * Discard memory allocated for mount list */ void discard_mntlist(mntlist *mp) { mntlist *mp2; while ((mp2 = mp)) { mp = mp->mnext; if (mp2->mnt) mnt_free(mp2->mnt); XFREE(mp2); } } /* * Throw away a mount list */ void free_mntlist(mntlist *mp) { discard_mntlist(mp); #ifdef MOUNT_TABLE_ON_FILE unlock_mntlist(); #endif /* MOUNT_TABLE_ON_FILE */ } /* * Utility routine which returns a pointer to whatever follows an = in a * string. Returns null if = is not found in the string. */ char * haseq(char *instr) { if (instr) { char *eq = strchr(instr, '='); if (eq) return ++eq; } return NULL; } /* * Utility routine which returns a pointer to whatever * follows an = in a mount option. Returns null if option * doesn't exist or doesn't have an '='. Won't fail for opt,foo=. */ char * hasmnteq(mntent_t *mnt, char *opt) { if (mnt && opt) { /* disallow null input pointers */ if ( *opt ) { /* disallow the null string as an opt */ char *str = amu_hasmntopt(mnt, opt); if ( str ) { /* option was there */ char *eq = str + strlen(opt); /* Look at char just after option */ if (*eq == '=') /* Is it '=' ? */ return ++eq; /* If so, return pointer to remaining str */ } } } return NULL; } /* * Wrapper around hasmntvalerr(), which retains backwards compatibiliy with * older use of hasmntval(). * * XXX: eventually, all use of hasmntval() should be replaced with * hasmntvalerr(). */ int hasmntval(mntent_t *mnt, char *opt) { int err, val = 0; err = hasmntvalerr(mnt, opt, &val); if (err) /* if there was an error (hasmntvalerr returned 1) */ return 0; /* redundant: val==0 above, but leave here for clarity */ /* otherwise there was no error */ return val; } /* * Utility routine which determines the value of a numeric option in the * mount options (such as port=%d), and fills in the value in the argument * valp (argument won't be touched if no value is set, for example due to an * error). * * Returns non-zero (1) on error; returns 0 on success. * * XXX: eventually, all use of hasmntval() should be replaced with * hasmntvalerr(). */ unsigned int hasmntvalerr(mntent_t *mnt, char *opt, int *valp) { char *str = amu_hasmntopt(mnt, opt); int err = 1; /* 1 means no good value was set (an error) */ char *eq, *endptr; long int i; /* exit if no option specificed */ if (!str) { goto out; } eq = hasmnteq(mnt, opt); if (!eq) { /* no argument to option ('=' sign was missing) */ plog(XLOG_MAP, "numeric option to \"%s\" missing", opt); goto out; } /* if got here, then we had an '=' after option name */ endptr = NULL; i = strtol(eq, &endptr, 0); /* hex and octal allowed ;-) */ if (!endptr || (endptr != eq && (*endptr == ',' || *endptr == '\0'))) { /* * endptr set means strtol saw a non-digit. If the non-digit is a * comma, it's probably the start of the next option. If the comma is * the first char though, complain about it (foo=,bar is made * noticeable by this). * * Similar reasoning for '\0' instead of comma, it's the end of the * string. */ *valp = (int) i; /* set good value */ err = 0; /* no error */ } else { /* whatever was after the '=' sign wasn't a number */ plog(XLOG_MAP, "invalid numeric option in \"%s\": \"%s\"", opt, str); /* fall through to error/exit processing */ } out: return err; } /* * Utility routine which returns the string value of * an option in the mount options (such as proto=udp). * Returns NULL if the option is not specified. * Returns malloc'ed string (caller must free!) */ char * hasmntstr(mntent_t *mnt, char *opt) { char *str = amu_hasmntopt(mnt, opt); if (str) { /* The option was there */ char *eq = hasmnteq(mnt, opt); if (eq) { /* and had an = after it */ char *endptr = strchr(eq, ','); /* if saw no comma, return xstrdup'd string */ if (!endptr) return xstrdup(eq); else { /* else we need to copy only the chars needed */ int len = endptr - eq; char *buf = xmalloc(len + 1); strncpy(buf, eq, len); buf[len] = '\0'; return buf; } } } return NULL; }