Annotation of embedaddon/sudo/common/fileops.c, revision 1.1.1.3
1.1 misho 1: /*
1.1.1.3 ! misho 2: * Copyright (c) 1999-2005, 2007, 2009-2013
1.1 misho 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/time.h>
26: #ifdef HAVE_FLOCK
27: # include <sys/file.h>
28: #endif /* HAVE_FLOCK */
1.1.1.3 ! misho 29: #ifdef STDC_HEADERS
! 30: # include <stdlib.h>
! 31: # include <stddef.h>
1.1.1.2 misho 32: #else
1.1.1.3 ! misho 33: # ifdef HAVE_STDLIB_H
! 34: # include <stdlib.h>
! 35: # endif
! 36: #endif /* STDC_HEADERS */
1.1 misho 37: #ifdef HAVE_STRING_H
1.1.1.3 ! misho 38: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
! 39: # include <memory.h>
! 40: # endif
1.1 misho 41: # include <string.h>
42: #endif /* HAVE_STRING_H */
43: #ifdef HAVE_STRINGS_H
44: # include <strings.h>
1.1.1.3 ! misho 45: #endif /* HAVE_STRING_H */
! 46: #if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
! 47: # include <malloc.h>
! 48: #endif /* HAVE_MALLOC_H && !STDC_HEADERS */
1.1 misho 49: #include <ctype.h>
50: #ifdef HAVE_UNISTD_H
51: # include <unistd.h>
52: #endif /* HAVE_UNISTD_H */
53: #include <fcntl.h>
1.1.1.3 ! misho 54: #ifdef HAVE_STDBOOL_H
! 55: # include <stdbool.h>
! 56: #else
! 57: # include "compat/stdbool.h"
! 58: #endif
1.1 misho 59: #if TIME_WITH_SYS_TIME
60: # include <time.h>
61: #endif
1.1.1.2 misho 62: #ifndef HAVE_STRUCT_TIMESPEC
1.1 misho 63: # include "compat/timespec.h"
64: #endif
65:
66: #include "missing.h"
67: #include "fileops.h"
1.1.1.2 misho 68: #include "sudo_debug.h"
1.1 misho 69:
70: /*
71: * Update the access and modify times on an fd or file.
72: */
73: int
74: touch(int fd, char *path, struct timeval *tvp)
75: {
76: struct timeval times[2];
1.1.1.2 misho 77: int rval = -1;
78: debug_decl(touch, SUDO_DEBUG_UTIL)
1.1 misho 79:
80: if (tvp != NULL) {
81: times[0].tv_sec = times[1].tv_sec = tvp->tv_sec;
82: times[0].tv_usec = times[1].tv_usec = tvp->tv_usec;
83: }
84:
85: #if defined(HAVE_FUTIME) || defined(HAVE_FUTIMES)
86: if (fd != -1)
1.1.1.2 misho 87: rval = futimes(fd, tvp ? times : NULL);
1.1 misho 88: else
89: #endif
90: if (path != NULL)
1.1.1.2 misho 91: rval = utimes(path, tvp ? times : NULL);
92: debug_return_int(rval);
1.1 misho 93: }
94:
95: /*
96: * Lock/unlock a file.
97: */
98: #ifdef HAVE_LOCKF
1.1.1.2 misho 99: bool
1.1 misho 100: lock_file(int fd, int lockit)
101: {
102: int op = 0;
1.1.1.2 misho 103: debug_decl(lock_file, SUDO_DEBUG_UTIL)
1.1 misho 104:
105: switch (lockit) {
106: case SUDO_LOCK:
107: op = F_LOCK;
108: break;
109: case SUDO_TLOCK:
110: op = F_TLOCK;
111: break;
112: case SUDO_UNLOCK:
113: op = F_ULOCK;
114: break;
115: }
1.1.1.2 misho 116: debug_return_bool(lockf(fd, op, 0) == 0);
1.1 misho 117: }
118: #elif HAVE_FLOCK
1.1.1.2 misho 119: bool
1.1 misho 120: lock_file(int fd, int lockit)
121: {
122: int op = 0;
1.1.1.2 misho 123: debug_decl(lock_file, SUDO_DEBUG_UTIL)
1.1 misho 124:
125: switch (lockit) {
126: case SUDO_LOCK:
127: op = LOCK_EX;
128: break;
129: case SUDO_TLOCK:
130: op = LOCK_EX | LOCK_NB;
131: break;
132: case SUDO_UNLOCK:
133: op = LOCK_UN;
134: break;
135: }
1.1.1.2 misho 136: debug_return_bool(flock(fd, op) == 0);
1.1 misho 137: }
138: #else
1.1.1.2 misho 139: bool
1.1 misho 140: lock_file(int fd, int lockit)
141: {
142: #ifdef F_SETLK
143: int func;
144: struct flock lock;
1.1.1.2 misho 145: debug_decl(lock_file, SUDO_DEBUG_UTIL)
1.1 misho 146:
147: lock.l_start = 0;
148: lock.l_len = 0;
149: lock.l_pid = getpid();
150: lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
151: lock.l_whence = SEEK_SET;
152: func = (lockit == SUDO_LOCK) ? F_SETLKW : F_SETLK;
153:
1.1.1.2 misho 154: debug_return_bool(fcntl(fd, func, &lock) == 0);
1.1 misho 155: #else
1.1.1.2 misho 156: return true;
1.1 misho 157: #endif
158: }
159: #endif
160:
161: /*
1.1.1.3 ! misho 162: * Read a line of input, honoring line continuation chars.
! 163: * Remove comments and strips off leading and trailing spaces.
! 164: * Returns the line length and updates the buf and bufsize pointers.
! 165: * XXX - just use a struct w/ state, including getline buffer?
! 166: * could also make comment char and line continuation configurable
1.1 misho 167: */
1.1.1.3 ! misho 168: ssize_t
! 169: sudo_parseln(char **bufp, size_t *bufsizep, unsigned int *lineno, FILE *fp)
1.1 misho 170: {
1.1.1.3 ! misho 171: size_t len, linesize = 0, total = 0;
! 172: char *cp, *line = NULL;
! 173: bool continued;
1.1.1.2 misho 174: debug_decl(sudo_parseln, SUDO_DEBUG_UTIL)
1.1 misho 175:
1.1.1.3 ! misho 176: do {
! 177: continued = false;
! 178: len = getline(&line, &linesize, fp);
! 179: if (len == -1)
! 180: break;
! 181: if (lineno != NULL)
! 182: (*lineno)++;
! 183:
! 184: /* Remove trailing newline(s) if present. */
! 185: while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
! 186: line[--len] = '\0';
1.1 misho 187:
1.1.1.3 ! misho 188: /* Remove comments or check for line continuation (but not both) */
! 189: if ((cp = strchr(line, '#')) != NULL) {
! 190: *cp = '\0';
! 191: len = (size_t)(cp - line);
! 192: } else if (len > 0 && line[len - 1] == '\\' && (len == 1 || line[len - 2] != '\\')) {
! 193: line[--len] = '\0';
! 194: continued = true;
! 195: }
! 196:
! 197: /* Trim leading and trailing whitespace */
! 198: if (!continued) {
! 199: while (len > 0 && isblank((unsigned char)line[len - 1]))
! 200: line[--len] = '\0';
! 201: }
! 202: for (cp = line; isblank((unsigned char)*cp); cp++)
! 203: len--;
! 204:
! 205: if (*bufp == NULL || total + len >= *bufsizep) {
! 206: void *tmp;
! 207: size_t size = total + len + 1;
! 208:
! 209: if (size < 64) {
! 210: size = 64;
! 211: } else if (size <= 0x80000000) {
! 212: /* Round up to next highest power of two. */
! 213: size--;
! 214: size |= size >> 1;
! 215: size |= size >> 2;
! 216: size |= size >> 4;
! 217: size |= size >> 8;
! 218: size |= size >> 16;
! 219: size++;
! 220: }
! 221: if ((tmp = realloc(*bufp, size)) == NULL)
! 222: break;
! 223: *bufp = tmp;
! 224: *bufsizep = size;
! 225: }
! 226: memcpy(*bufp + total, cp, len + 1);
! 227: total += len;
! 228: } while (continued);
! 229: free(line);
! 230: if (len == -1 && total == 0)
! 231: debug_return_size_t((size_t)-1);
! 232: debug_return_size_t(total);
1.1 misho 233: }
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