util.c revision 178825 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if 0
35#ifndef lint
36#if 0
37static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
38#endif
39static const char rcsid[] =
40  "$FreeBSD: vendor-crypto/heimdal/dist/crypto/heimdal/appl/rcp/util.c 178825 2008-05-07 13:39:42Z dfr $";
41#endif /* not lint */
42#endif
43
44#include "rcp_locl.h"
45
46RCSID("$Id: util.c 17878 2006-08-08 21:43:58Z lha $");
47
48char *
49colon(cp)
50	char *cp;
51{
52	if (*cp == ':')		/* Leading colon is part of file name. */
53		return (0);
54
55	for (; *cp; ++cp) {
56		if (*cp == ':')
57			return (cp);
58		if (*cp == '/')
59			return (0);
60	}
61	return (0);
62}
63
64void
65verifydir(cp)
66	char *cp;
67{
68	struct stat stb;
69
70	if (!stat(cp, &stb)) {
71		if (S_ISDIR(stb.st_mode))
72			return;
73		errno = ENOTDIR;
74	}
75	run_err("%s: %s", cp, strerror(errno));
76	exit(1);
77}
78
79int
80okname(cp0)
81	char *cp0;
82{
83	int c;
84	unsigned char *cp;
85
86	cp = (unsigned char *)cp0;
87	do {
88		c = *cp;
89		if (c & 0200)
90			goto bad;
91		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
92			goto bad;
93	} while (*++cp);
94	return (1);
95
96bad:	warnx("%s: invalid user name", cp0);
97	return (0);
98}
99
100int
101susystem(s, userid)
102	int userid;
103	char *s;
104{
105	void (*istat)(int), (*qstat)(int);
106	int status;
107	pid_t pid;
108
109	pid = fork();
110	switch (pid) {
111	case -1:
112		return (127);
113
114	case 0:
115		if (setuid(userid) < 0)
116			_exit(127);
117		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
118		_exit(127);
119	}
120	istat = signal(SIGINT, SIG_IGN);
121	qstat = signal(SIGQUIT, SIG_IGN);
122	if (waitpid(pid, &status, 0) < 0)
123		status = -1;
124	(void)signal(SIGINT, istat);
125	(void)signal(SIGQUIT, qstat);
126	return (status);
127}
128
129#ifndef roundup
130#define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))
131#endif
132
133BUF *
134allocbuf(bp, fd, blksize)
135	BUF *bp;
136	int fd, blksize;
137{
138	struct stat stb;
139	size_t size;
140	char *p;
141
142	if (fstat(fd, &stb) < 0) {
143		run_err("fstat: %s", strerror(errno));
144		return (0);
145	}
146	size = roundup(stb.st_blksize, blksize);
147	if (size == 0)
148		size = blksize;
149	if (bp->cnt >= size)
150		return (bp);
151	if ((p = realloc(bp->buf, size)) == NULL) {
152		if (bp->buf)
153			free(bp->buf);
154		bp->buf = NULL;
155		bp->cnt = 0;
156		run_err("%s", strerror(errno));
157		return (0);
158	}
159	memset(p, 0, size);
160	bp->buf = p;
161	bp->cnt = size;
162	return (bp);
163}
164
165void
166lostconn(signo)
167	int signo;
168{
169	if (!iamremote)
170		warnx("lost connection");
171	exit(1);
172}
173