1: /*
2: * Copyright (c) 1999-2005, 2007, 2009-2013
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 */
29: #ifdef STDC_HEADERS
30: # include <stdlib.h>
31: # include <stddef.h>
32: #else
33: # ifdef HAVE_STDLIB_H
34: # include <stdlib.h>
35: # endif
36: #endif /* STDC_HEADERS */
37: #ifdef HAVE_STRING_H
38: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
39: # include <memory.h>
40: # endif
41: # include <string.h>
42: #endif /* HAVE_STRING_H */
43: #ifdef HAVE_STRINGS_H
44: # include <strings.h>
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 */
49: #include <ctype.h>
50: #ifdef HAVE_UNISTD_H
51: # include <unistd.h>
52: #endif /* HAVE_UNISTD_H */
53: #include <fcntl.h>
54: #ifdef HAVE_STDBOOL_H
55: # include <stdbool.h>
56: #else
57: # include "compat/stdbool.h"
58: #endif
59: #ifdef TIME_WITH_SYS_TIME
60: # include <time.h>
61: #endif
62: #ifndef HAVE_STRUCT_TIMESPEC
63: # include "compat/timespec.h"
64: #endif
65:
66: #include "missing.h"
67: #include "fileops.h"
68: #include "sudo_debug.h"
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];
77: int rval = -1;
78: debug_decl(touch, SUDO_DEBUG_UTIL)
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)
87: rval = futimes(fd, tvp ? times : NULL);
88: else
89: #endif
90: if (path != NULL)
91: rval = utimes(path, tvp ? times : NULL);
92: debug_return_int(rval);
93: }
94:
95: /*
96: * Lock/unlock a file.
97: */
98: #ifdef HAVE_LOCKF
99: bool
100: lock_file(int fd, int lockit)
101: {
102: int op = 0;
103: debug_decl(lock_file, SUDO_DEBUG_UTIL)
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: }
116: debug_return_bool(lockf(fd, op, 0) == 0);
117: }
118: #elif defined(HAVE_FLOCK)
119: bool
120: lock_file(int fd, int lockit)
121: {
122: int op = 0;
123: debug_decl(lock_file, SUDO_DEBUG_UTIL)
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: }
136: debug_return_bool(flock(fd, op) == 0);
137: }
138: #else
139: bool
140: lock_file(int fd, int lockit)
141: {
142: #ifdef F_SETLK
143: int func;
144: struct flock lock;
145: debug_decl(lock_file, SUDO_DEBUG_UTIL)
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:
154: debug_return_bool(fcntl(fd, func, &lock) == 0);
155: #else
156: return true;
157: #endif
158: }
159: #endif
160:
161: /*
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
167: */
168: ssize_t
169: sudo_parseln(char **bufp, size_t *bufsizep, unsigned int *lineno, FILE *fp)
170: {
171: size_t linesize = 0, total = 0;
172: ssize_t len;
173: char *cp, *line = NULL;
174: bool continued;
175: debug_decl(sudo_parseln, SUDO_DEBUG_UTIL)
176:
177: do {
178: continued = false;
179: len = getline(&line, &linesize, fp);
180: if (len == -1)
181: break;
182: if (lineno != NULL)
183: (*lineno)++;
184:
185: /* Remove trailing newline(s) if present. */
186: while (len > 0 && (line[len - 1] == '\n' || line[len - 1] == '\r'))
187: line[--len] = '\0';
188:
189: /* Remove comments or check for line continuation (but not both) */
190: if ((cp = strchr(line, '#')) != NULL) {
191: *cp = '\0';
192: len = (size_t)(cp - line);
193: } else if (len > 0 && line[len - 1] == '\\' && (len == 1 || line[len - 2] != '\\')) {
194: line[--len] = '\0';
195: continued = true;
196: }
197:
198: /* Trim leading and trailing whitespace */
199: if (!continued) {
200: while (len > 0 && isblank((unsigned char)line[len - 1]))
201: line[--len] = '\0';
202: }
203: for (cp = line; isblank((unsigned char)*cp); cp++)
204: len--;
205:
206: if (*bufp == NULL || total + len >= *bufsizep) {
207: void *tmp;
208: size_t size = total + len + 1;
209:
210: if (size < 64) {
211: size = 64;
212: } else if (size <= 0x80000000) {
213: /* Round up to next highest power of two. */
214: size--;
215: size |= size >> 1;
216: size |= size >> 2;
217: size |= size >> 4;
218: size |= size >> 8;
219: size |= size >> 16;
220: size++;
221: }
222: if ((tmp = realloc(*bufp, size)) == NULL)
223: break;
224: *bufp = tmp;
225: *bufsizep = size;
226: }
227: memcpy(*bufp + total, cp, len + 1);
228: total += len;
229: } while (continued);
230: free(line);
231: if (len == -1 && total == 0)
232: debug_return_size_t((size_t)-1);
233: debug_return_size_t(total);
234: }
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