bsd-misc.c revision 149749 
1
2/*
3 * Copyright (c) 1999-2004 Damien Miller <djm@mindrot.org>
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
18#include "includes.h"
19#include "xmalloc.h"
20
21RCSID("$Id: bsd-misc.c,v 1.27 2005/05/27 11:13:41 dtucker Exp $");
22
23#ifndef HAVE___PROGNAME
24char *__progname;
25#endif
26
27/*
28 * NB. duplicate __progname in case it is an alias for argv[0]
29 * Otherwise it may get clobbered by setproctitle()
30 */
31char *ssh_get_progname(char *argv0)
32{
33#ifdef HAVE___PROGNAME
34	extern char *__progname;
35
36	return xstrdup(__progname);
37#else
38	char *p;
39
40	if (argv0 == NULL)
41		return ("unknown");	/* XXX */
42	p = strrchr(argv0, '/');
43	if (p == NULL)
44		p = argv0;
45	else
46		p++;
47
48	return (xstrdup(p));
49#endif
50}
51
52#ifndef HAVE_SETLOGIN
53int setlogin(const char *name)
54{
55	return (0);
56}
57#endif /* !HAVE_SETLOGIN */
58
59#ifndef HAVE_INNETGR
60int innetgr(const char *netgroup, const char *host,
61            const char *user, const char *domain)
62{
63	return (0);
64}
65#endif /* HAVE_INNETGR */
66
67#if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
68int seteuid(uid_t euid)
69{
70	return (setreuid(-1, euid));
71}
72#endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */
73
74#if !defined(HAVE_SETEGID) && defined(HAVE_SETRESGID)
75int setegid(uid_t egid)
76{
77	return(setresgid(-1, egid, -1));
78}
79#endif /* !defined(HAVE_SETEGID) && defined(HAVE_SETRESGID) */
80
81#if !defined(HAVE_STRERROR) && defined(HAVE_SYS_ERRLIST) && defined(HAVE_SYS_NERR)
82const char *strerror(int e)
83{
84	extern int sys_nerr;
85	extern char *sys_errlist[];
86
87	if ((e >= 0) && (e < sys_nerr))
88		return (sys_errlist[e]);
89
90	return ("unlisted error");
91}
92#endif
93
94#ifndef HAVE_UTIMES
95int utimes(char *filename, struct timeval *tvp)
96{
97	struct utimbuf ub;
98
99	ub.actime = tvp[0].tv_sec;
100	ub.modtime = tvp[1].tv_sec;
101
102	return (utime(filename, &ub));
103}
104#endif
105
106#ifndef HAVE_TRUNCATE
107int truncate(const char *path, off_t length)
108{
109	int fd, ret, saverrno;
110
111	fd = open(path, O_WRONLY);
112	if (fd < 0)
113		return (-1);
114
115	ret = ftruncate(fd, length);
116	saverrno = errno;
117	close(fd);
118	if (ret == -1)
119		errno = saverrno;
120
121	return(ret);
122}
123#endif /* HAVE_TRUNCATE */
124
125#if !defined(HAVE_NANOSLEEP) && !defined(HAVE_NSLEEP)
126int nanosleep(const struct timespec *req, struct timespec *rem)
127{
128	int rc, saverrno;
129	extern int errno;
130	struct timeval tstart, tstop, tremain, time2wait;
131
132	TIMESPEC_TO_TIMEVAL(&time2wait, req)
133	(void) gettimeofday(&tstart, NULL);
134	rc = select(0, NULL, NULL, NULL, &time2wait);
135	if (rc == -1) {
136		saverrno = errno;
137		(void) gettimeofday (&tstop, NULL);
138		errno = saverrno;
139		tremain.tv_sec = time2wait.tv_sec -
140			(tstop.tv_sec - tstart.tv_sec);
141		tremain.tv_usec = time2wait.tv_usec -
142			(tstop.tv_usec - tstart.tv_usec);
143		tremain.tv_sec += tremain.tv_usec / 1000000L;
144		tremain.tv_usec %= 1000000L;
145	} else {
146		tremain.tv_sec = 0;
147		tremain.tv_usec = 0;
148	}
149	TIMEVAL_TO_TIMESPEC(&tremain, rem)
150
151	return(rc);
152}
153#endif
154
155#ifndef HAVE_TCGETPGRP
156pid_t
157tcgetpgrp(int fd)
158{
159	int ctty_pgrp;
160
161	if (ioctl(fd, TIOCGPGRP, &ctty_pgrp) == -1)
162		return(-1);
163	else
164		return(ctty_pgrp);
165}
166#endif /* HAVE_TCGETPGRP */
167
168#ifndef HAVE_TCSENDBREAK
169int
170tcsendbreak(int fd, int duration)
171{
172# if defined(TIOCSBRK) && defined(TIOCCBRK)
173	struct timeval sleepytime;
174
175	sleepytime.tv_sec = 0;
176	sleepytime.tv_usec = 400000;
177	if (ioctl(fd, TIOCSBRK, 0) == -1)
178		return (-1);
179	(void)select(0, 0, 0, 0, &sleepytime);
180	if (ioctl(fd, TIOCCBRK, 0) == -1)
181		return (-1);
182	return (0);
183# else
184	return -1;
185# endif
186}
187#endif /* HAVE_TCSENDBREAK */
188
189mysig_t
190mysignal(int sig, mysig_t act)
191{
192#ifdef HAVE_SIGACTION
193	struct sigaction sa, osa;
194
195	if (sigaction(sig, NULL, &osa) == -1)
196		return (mysig_t) -1;
197	if (osa.sa_handler != act) {
198		memset(&sa, 0, sizeof(sa));
199		sigemptyset(&sa.sa_mask);
200		sa.sa_flags = 0;
201#ifdef SA_INTERRUPT
202		if (sig == SIGALRM)
203			sa.sa_flags |= SA_INTERRUPT;
204#endif
205		sa.sa_handler = act;
206		if (sigaction(sig, &sa, NULL) == -1)
207			return (mysig_t) -1;
208	}
209	return (osa.sa_handler);
210#else
211	#undef signal
212	return (signal(sig, act));
213#endif
214}
215
216#ifndef HAVE_STRDUP
217char *
218strdup(const char *str)
219{
220	size_t len;
221	char *cp;
222
223	len = strlen(str) + 1;
224	cp = malloc(len);
225	if (cp != NULL)
226		if (strlcpy(cp, str, len) != len) {
227			free(cp);
228			return NULL;
229		}
230	return cp;
231}
232#endif
233