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Annotation of embedaddon/sudo/common/fileops.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 1999-2005, 2007, 2009-2011
                      3:  *     Todd C. Miller <Todd.Miller@courtesan.com>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     16:  *
                     17:  * Sponsored in part by the Defense Advanced Research Projects
                     18:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
                     19:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
                     20:  */
                     21: 
                     22: #include <config.h>
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/param.h>
                     26: #include <sys/time.h>
                     27: #ifdef HAVE_FLOCK
                     28: # include <sys/file.h>
                     29: #endif /* HAVE_FLOCK */
                     30: #include <stdio.h>
                     31: #ifdef HAVE_STRING_H
                     32: # include <string.h>
                     33: #endif /* HAVE_STRING_H */
                     34: #ifdef HAVE_STRINGS_H
                     35: # include <strings.h>
                     36: #endif /* HAVE_STRINGS_H */
                     37: #include <ctype.h>
                     38: #include <limits.h>
                     39: #ifdef HAVE_UNISTD_H
                     40: # include <unistd.h>
                     41: #endif /* HAVE_UNISTD_H */
                     42: #include <fcntl.h>
                     43: #if TIME_WITH_SYS_TIME
                     44: # include <time.h>
                     45: #endif
                     46: #ifndef HAVE_TIMESPEC
                     47: # include "compat/timespec.h"
                     48: #endif
                     49: 
                     50: #include "missing.h"
                     51: #include "fileops.h"
                     52: 
                     53: #ifndef LINE_MAX
                     54: # define LINE_MAX 2048
                     55: #endif
                     56: 
                     57: /*
                     58:  * Update the access and modify times on an fd or file.
                     59:  */
                     60: int
                     61: touch(int fd, char *path, struct timeval *tvp)
                     62: {
                     63:     struct timeval times[2];
                     64: 
                     65:     if (tvp != NULL) {
                     66:        times[0].tv_sec = times[1].tv_sec = tvp->tv_sec;
                     67:        times[0].tv_usec = times[1].tv_usec = tvp->tv_usec;
                     68:     }
                     69: 
                     70: #if defined(HAVE_FUTIME) || defined(HAVE_FUTIMES)
                     71:     if (fd != -1)
                     72:        return futimes(fd, tvp ? times : NULL);
                     73:     else
                     74: #endif
                     75:     if (path != NULL)
                     76:        return utimes(path, tvp ? times : NULL);
                     77:     else
                     78:        return -1;
                     79: }
                     80: 
                     81: /*
                     82:  * Lock/unlock a file.
                     83:  */
                     84: #ifdef HAVE_LOCKF
                     85: int
                     86: lock_file(int fd, int lockit)
                     87: {
                     88:     int op = 0;
                     89: 
                     90:     switch (lockit) {
                     91:        case SUDO_LOCK:
                     92:            op = F_LOCK;
                     93:            break;
                     94:        case SUDO_TLOCK:
                     95:            op = F_TLOCK;
                     96:            break;
                     97:        case SUDO_UNLOCK:
                     98:            op = F_ULOCK;
                     99:            break;
                    100:     }
                    101:     return lockf(fd, op, 0) == 0;
                    102: }
                    103: #elif HAVE_FLOCK
                    104: int
                    105: lock_file(int fd, int lockit)
                    106: {
                    107:     int op = 0;
                    108: 
                    109:     switch (lockit) {
                    110:        case SUDO_LOCK:
                    111:            op = LOCK_EX;
                    112:            break;
                    113:        case SUDO_TLOCK:
                    114:            op = LOCK_EX | LOCK_NB;
                    115:            break;
                    116:        case SUDO_UNLOCK:
                    117:            op = LOCK_UN;
                    118:            break;
                    119:     }
                    120:     return flock(fd, op) == 0;
                    121: }
                    122: #else
                    123: int
                    124: lock_file(int fd, int lockit)
                    125: {
                    126: #ifdef F_SETLK
                    127:     int func;
                    128:     struct flock lock;
                    129: 
                    130:     lock.l_start = 0;
                    131:     lock.l_len = 0;
                    132:     lock.l_pid = getpid();
                    133:     lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
                    134:     lock.l_whence = SEEK_SET;
                    135:     func = (lockit == SUDO_LOCK) ? F_SETLKW : F_SETLK;
                    136: 
                    137:     return fcntl(fd, func, &lock) == 0;
                    138: #else
                    139:     return TRUE;
                    140: #endif
                    141: }
                    142: #endif
                    143: 
                    144: /*
                    145:  * Read a line of input, remove comments and strip off leading
                    146:  * and trailing spaces.  Returns static storage that is reused.
                    147:  */
                    148: char *
                    149: sudo_parseln(FILE *fp)
                    150: {
                    151:     size_t len;
                    152:     char *cp = NULL;
                    153:     static char buf[LINE_MAX];
                    154: 
                    155:     if (fgets(buf, sizeof(buf), fp) != NULL) {
                    156:        /* Remove comments */
                    157:        if ((cp = strchr(buf, '#')) != NULL)
                    158:            *cp = '\0';
                    159: 
                    160:        /* Trim leading and trailing whitespace/newline */
                    161:        len = strlen(buf);
                    162:        while (len > 0 && isspace((unsigned char)buf[len - 1]))
                    163:            buf[--len] = '\0';
                    164:        for (cp = buf; isblank((unsigned char)*cp); cp++)
                    165:            continue;
                    166:     }
                    167:     return cp;
                    168: }