Annotation of src/usr.bin/sudo/fileops.c, Revision 1.9
1.1 millert 1: /*
1.8 millert 2: * Copyright (c) 1999-2005,2007,2009 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 3: *
1.4 millert 4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.3 millert 15: *
16: * Sponsored in part by the Defense Advanced Research Projects
17: * Agency (DARPA) and Air Force Research Laboratory, Air Force
18: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.1 millert 19: */
20:
1.5 millert 21: #include <config.h>
1.1 millert 22:
1.2 millert 23: #include <sys/types.h>
24: #include <sys/param.h>
1.4 millert 25: #include <sys/time.h>
1.2 millert 26: #ifdef HAVE_FLOCK
27: # include <sys/file.h>
28: #endif /* HAVE_FLOCK */
1.1 millert 29: #include <stdio.h>
1.6 millert 30: #ifdef HAVE_STRING_H
31: # include <string.h>
32: #else
33: # ifdef HAVE_STRINGS_H
34: # include <strings.h>
35: # endif
36: #endif /* HAVE_STRING_H */
37: #include <ctype.h>
38: #include <limits.h>
1.1 millert 39: #ifdef HAVE_UNISTD_H
1.2 millert 40: # include <unistd.h>
1.1 millert 41: #endif /* HAVE_UNISTD_H */
42: #include <fcntl.h>
1.5 millert 43: #if TIME_WITH_SYS_TIME
44: # include <time.h>
45: #endif
46: #ifndef HAVE_TIMESPEC
47: # include <emul/timespec.h>
48: #endif
1.1 millert 49:
50: #include "sudo.h"
51:
1.6 millert 52: #ifndef LINE_MAX
53: # define LINE_MAX 2048
54: #endif
55:
1.1 millert 56: /*
1.4 millert 57: * Update the access and modify times on an fd or file.
1.1 millert 58: */
59: int
1.4 millert 60: touch(fd, path, tsp)
61: int fd;
1.1 millert 62: char *path;
1.4 millert 63: struct timespec *tsp;
1.1 millert 64: {
1.4 millert 65: struct timeval times[2];
1.1 millert 66:
1.4 millert 67: if (tsp != NULL) {
68: times[0].tv_sec = times[1].tv_sec = tsp->tv_sec;
69: times[0].tv_usec = times[1].tv_usec = tsp->tv_nsec / 1000;
70: }
71:
72: #if defined(HAVE_FUTIME) || defined(HAVE_FUTIMES)
73: if (fd != -1)
74: return(futimes(fd, tsp ? times : NULL));
75: else
76: #endif
77: if (path != NULL)
78: return(utimes(path, tsp ? times : NULL));
79: else
80: return(-1);
1.1 millert 81: }
82:
83: /*
84: * Lock/unlock a file.
85: */
86: #ifdef HAVE_LOCKF
87: int
88: lock_file(fd, lockit)
89: int fd;
90: int lockit;
91: {
92: int op = 0;
93:
94: switch (lockit) {
95: case SUDO_LOCK:
96: op = F_LOCK;
97: break;
98: case SUDO_TLOCK:
99: op = F_TLOCK;
100: break;
101: case SUDO_UNLOCK:
102: op = F_ULOCK;
103: break;
104: }
105: return(lockf(fd, op, 0) == 0);
106: }
107: #elif HAVE_FLOCK
108: int
109: lock_file(fd, lockit)
110: int fd;
111: int lockit;
112: {
113: int op = 0;
114:
115: switch (lockit) {
116: case SUDO_LOCK:
117: op = LOCK_EX;
118: break;
119: case SUDO_TLOCK:
120: op = LOCK_EX | LOCK_NB;
121: break;
122: case SUDO_UNLOCK:
1.2 millert 123: op = LOCK_UN;
1.1 millert 124: break;
125: }
126: return(flock(fd, op) == 0);
127: }
128: #else
129: int
130: lock_file(fd, lockit)
131: int fd;
132: int lockit;
133: {
134: #ifdef F_SETLK
135: int func;
136: struct flock lock;
137:
138: lock.l_start = 0;
139: lock.l_len = 0;
140: lock.l_pid = getpid();
141: lock.l_type = (lockit == SUDO_UNLOCK) ? F_UNLCK : F_WRLCK;
142: lock.l_whence = SEEK_SET;
1.8 millert 143: func = (lockit == SUDO_LOCK) ? F_SETLKW : F_SETLK;
1.1 millert 144:
145: return(fcntl(fd, func, &lock) == 0);
146: #else
147: return(TRUE);
148: #endif
149: }
150: #endif
1.6 millert 151:
152: /*
153: * Read a line of input, remove comments and strip off leading
154: * and trailing spaces. Returns static storage that is reused.
155: */
156: char *
157: sudo_parseln(fp)
158: FILE *fp;
159: {
160: size_t len;
161: char *cp = NULL;
162: static char buf[LINE_MAX];
163:
164: if (fgets(buf, sizeof(buf), fp) != NULL) {
165: /* Remove comments */
166: if ((cp = strchr(buf, '#')) != NULL)
167: *cp = '\0';
168:
169: /* Trim leading and trailing whitespace/newline */
170: len = strlen(buf);
1.7 millert 171: while (len > 0 && isspace((unsigned char)buf[len - 1]))
1.6 millert 172: buf[--len] = '\0';
173: for (cp = buf; isblank(*cp); cp++)
174: continue;
175: }
176: return(cp);
177: }
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