1/*
2 * Copyright (c) 1999-2005, 2007, 2009, 2010
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_STRUCT_TIMESPEC
47# include "emul/timespec.h"
48#endif
49
50#include "sudo.h"
51
52#ifndef LINE_MAX
53# define LINE_MAX 2048
54#endif
55
56/*
57 * Update the access and modify times on an fd or file.
58 */
59int
60touch(fd, path, tvp)
61    int fd;
62    char *path;
63    struct timeval *tvp;
64{
65    struct timeval times[2];
66
67    if (tvp != NULL) {
68	times[0].tv_sec = times[1].tv_sec = tvp->tv_sec;
69	times[0].tv_usec = times[1].tv_usec = tvp->tv_usec;
70    }
71
72#if defined(HAVE_FUTIME) || defined(HAVE_FUTIMES)
73    if (fd != -1)
74	return futimes(fd, tvp ? times : NULL);
75    else
76#endif
77    if (path != NULL)
78	return utimes(path, tvp ? times : NULL);
79    else
80	return -1;
81}
82
83/*
84 * Lock/unlock a file.
85 */
86#ifdef HAVE_LOCKF
87int
88lock_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
108int
109lock_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:
123	    op = LOCK_UN;
124	    break;
125    }
126    return flock(fd, op) == 0;
127}
128#else
129int
130lock_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;
143    func = (lockit == SUDO_LOCK) ? F_SETLKW : F_SETLK;
144
145    return fcntl(fd, func, &lock) == 0;
146#else
147    return TRUE;
148#endif
149}
150#endif
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 */
156char *
157sudo_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);
171	while (len > 0 && isspace((unsigned char)buf[len - 1]))
172	    buf[--len] = '\0';
173	for (cp = buf; isblank((unsigned char)*cp); cp++)
174	    continue;
175    }
176    return cp;
177}
178