util.c revision 79452 
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#ifndef lint
35#if 0
36static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/bin/rcp/util.c 79452 2001-07-09 09:24:06Z brian $";
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/stat.h>
44#include <sys/wait.h>
45
46#include <ctype.h>
47#include <err.h>
48#include <errno.h>
49#include <paths.h>
50#include <signal.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <string.h>
54#include <unistd.h>
55
56#include "extern.h"
57
58char *
59colon(cp)
60	char *cp;
61{
62	if (*cp == ':')		/* Leading colon is part of file name. */
63		return (0);
64
65	for (; *cp; ++cp) {
66		if (*cp == ':')
67			return (cp);
68		if (*cp == '/')
69			return (0);
70	}
71	return (0);
72}
73
74void
75verifydir(cp)
76	char *cp;
77{
78	struct stat stb;
79
80	if (!stat(cp, &stb)) {
81		if (S_ISDIR(stb.st_mode))
82			return;
83		errno = ENOTDIR;
84	}
85	run_err("%s: %s", cp, strerror(errno));
86	exit(1);
87}
88
89int
90okname(cp0)
91	char *cp0;
92{
93	int c;
94	char *cp;
95
96	cp = cp0;
97	do {
98		c = *cp;
99		if (c & 0200)
100			goto bad;
101		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-' && c != '.' )
102			goto bad;
103	} while (*++cp);
104	return (1);
105
106bad:	warnx("%s: invalid user name", cp0);
107	return (0);
108}
109
110int
111susystem(s, userid)
112	int userid;
113	char *s;
114{
115	sig_t istat, qstat;
116	int status;
117	pid_t pid;
118
119	pid = vfork();
120	switch (pid) {
121	case -1:
122		return (127);
123
124	case 0:
125		(void)setuid(userid);
126		execl(_PATH_BSHELL, "sh", "-c", s, (char *)NULL);
127		_exit(127);
128	}
129	istat = signal(SIGINT, SIG_IGN);
130	qstat = signal(SIGQUIT, SIG_IGN);
131	if (waitpid(pid, &status, 0) < 0)
132		status = -1;
133	(void)signal(SIGINT, istat);
134	(void)signal(SIGQUIT, qstat);
135	return (status);
136}
137
138BUF *
139allocbuf(bp, fd, blksize)
140	BUF *bp;
141	int fd, blksize;
142{
143	struct stat stb;
144	size_t size;
145
146	if (fstat(fd, &stb) < 0) {
147		run_err("fstat: %s", strerror(errno));
148		return (0);
149	}
150	size = roundup(stb.st_blksize, blksize);
151	if (size == 0)
152		size = blksize;
153	if (bp->cnt >= size)
154		return (bp);
155	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
156		bp->cnt = 0;
157		run_err("%s", strerror(errno));
158		return (0);
159	}
160	bp->cnt = size;
161	return (bp);
162}
163
164void
165lostconn(signo)
166	int signo;
167{
168	if (!iamremote)
169		warnx("lost connection");
170	exit(1);
171}
172