bsd-misc.c revision 225736 
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
20#include <sys/types.h>
21#ifdef HAVE_SYS_SELECT_H
22# include <sys/select.h>
23#endif
24#ifdef HAVE_SYS_TIME_H
25# include <sys/time.h>
26#endif
27
28#include <string.h>
29#include <signal.h>
30#include <stdlib.h>
31#include <unistd.h>
32
33#include "xmalloc.h"
34
35#ifndef HAVE___PROGNAME
36char *__progname;
37#endif
38
39/*
40 * NB. duplicate __progname in case it is an alias for argv[0]
41 * Otherwise it may get clobbered by setproctitle()
42 */
43char *ssh_get_progname(char *argv0)
44{
45#ifdef HAVE___PROGNAME
46	extern char *__progname;
47
48	return xstrdup(__progname);
49#else
50	char *p;
51
52	if (argv0 == NULL)
53		return ("unknown");	/* XXX */
54	p = strrchr(argv0, '/');
55	if (p == NULL)
56		p = argv0;
57	else
58		p++;
59
60	return (xstrdup(p));
61#endif
62}
63
64#ifndef HAVE_SETLOGIN
65int setlogin(const char *name)
66{
67	return (0);
68}
69#endif /* !HAVE_SETLOGIN */
70
71#ifndef HAVE_INNETGR
72int innetgr(const char *netgroup, const char *host,
73            const char *user, const char *domain)
74{
75	return (0);
76}
77#endif /* HAVE_INNETGR */
78
79#if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
80int seteuid(uid_t euid)
81{
82	return (setreuid(-1, euid));
83}
84#endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */
85
86#if !defined(HAVE_SETEGID) && defined(HAVE_SETRESGID)
87int setegid(uid_t egid)
88{
89	return(setresgid(-1, egid, -1));
90}
91#endif /* !defined(HAVE_SETEGID) && defined(HAVE_SETRESGID) */
92
93#if !defined(HAVE_STRERROR) && defined(HAVE_SYS_ERRLIST) && defined(HAVE_SYS_NERR)
94const char *strerror(int e)
95{
96	extern int sys_nerr;
97	extern char *sys_errlist[];
98
99	if ((e >= 0) && (e < sys_nerr))
100		return (sys_errlist[e]);
101
102	return ("unlisted error");
103}
104#endif
105
106#ifndef HAVE_UTIMES
107int utimes(char *filename, struct timeval *tvp)
108{
109	struct utimbuf ub;
110
111	ub.actime = tvp[0].tv_sec;
112	ub.modtime = tvp[1].tv_sec;
113
114	return (utime(filename, &ub));
115}
116#endif
117
118#ifndef HAVE_TRUNCATE
119int truncate(const char *path, off_t length)
120{
121	int fd, ret, saverrno;
122
123	fd = open(path, O_WRONLY);
124	if (fd < 0)
125		return (-1);
126
127	ret = ftruncate(fd, length);
128	saverrno = errno;
129	close(fd);
130	if (ret == -1)
131		errno = saverrno;
132
133	return(ret);
134}
135#endif /* HAVE_TRUNCATE */
136
137#if !defined(HAVE_NANOSLEEP) && !defined(HAVE_NSLEEP)
138int nanosleep(const struct timespec *req, struct timespec *rem)
139{
140	int rc, saverrno;
141	extern int errno;
142	struct timeval tstart, tstop, tremain, time2wait;
143
144	TIMESPEC_TO_TIMEVAL(&time2wait, req)
145	(void) gettimeofday(&tstart, NULL);
146	rc = select(0, NULL, NULL, NULL, &time2wait);
147	if (rc == -1) {
148		saverrno = errno;
149		(void) gettimeofday (&tstop, NULL);
150		errno = saverrno;
151		tremain.tv_sec = time2wait.tv_sec -
152			(tstop.tv_sec - tstart.tv_sec);
153		tremain.tv_usec = time2wait.tv_usec -
154			(tstop.tv_usec - tstart.tv_usec);
155		tremain.tv_sec += tremain.tv_usec / 1000000L;
156		tremain.tv_usec %= 1000000L;
157	} else {
158		tremain.tv_sec = 0;
159		tremain.tv_usec = 0;
160	}
161	if (rem != NULL)
162		TIMEVAL_TO_TIMESPEC(&tremain, rem)
163
164	return(rc);
165}
166#endif
167
168#ifndef HAVE_TCGETPGRP
169pid_t
170tcgetpgrp(int fd)
171{
172	int ctty_pgrp;
173
174	if (ioctl(fd, TIOCGPGRP, &ctty_pgrp) == -1)
175		return(-1);
176	else
177		return(ctty_pgrp);
178}
179#endif /* HAVE_TCGETPGRP */
180
181#ifndef HAVE_TCSENDBREAK
182int
183tcsendbreak(int fd, int duration)
184{
185# if defined(TIOCSBRK) && defined(TIOCCBRK)
186	struct timeval sleepytime;
187
188	sleepytime.tv_sec = 0;
189	sleepytime.tv_usec = 400000;
190	if (ioctl(fd, TIOCSBRK, 0) == -1)
191		return (-1);
192	(void)select(0, 0, 0, 0, &sleepytime);
193	if (ioctl(fd, TIOCCBRK, 0) == -1)
194		return (-1);
195	return (0);
196# else
197	return -1;
198# endif
199}
200#endif /* HAVE_TCSENDBREAK */
201
202mysig_t
203mysignal(int sig, mysig_t act)
204{
205#ifdef HAVE_SIGACTION
206	struct sigaction sa, osa;
207
208	if (sigaction(sig, NULL, &osa) == -1)
209		return (mysig_t) -1;
210	if (osa.sa_handler != act) {
211		memset(&sa, 0, sizeof(sa));
212		sigemptyset(&sa.sa_mask);
213		sa.sa_flags = 0;
214#ifdef SA_INTERRUPT
215		if (sig == SIGALRM)
216			sa.sa_flags |= SA_INTERRUPT;
217#endif
218		sa.sa_handler = act;
219		if (sigaction(sig, &sa, NULL) == -1)
220			return (mysig_t) -1;
221	}
222	return (osa.sa_handler);
223#else
224	#undef signal
225	return (signal(sig, act));
226#endif
227}
228
229#ifndef HAVE_STRDUP
230char *
231strdup(const char *str)
232{
233	size_t len;
234	char *cp;
235
236	len = strlen(str) + 1;
237	cp = malloc(len);
238	if (cp != NULL)
239		return(memcpy(cp, str, len));
240	return NULL;
241}
242#endif
243
244#ifndef HAVE_ISBLANK
245int isblank(int c)
246{
247	return (c == ' ' || c == '\t');
248}
249#endif
250