util.c revision 99110 
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
38#endif /* not lint */
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/bin/rcp/util.c 99110 2002-06-30 05:15:05Z obrien $");
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(char *cp)
60{
61	if (*cp == ':')		/* Leading colon is part of file name. */
62		return (0);
63
64	for (; *cp; ++cp) {
65		if (*cp == ':')
66			return (cp);
67		if (*cp == '/')
68			return (0);
69	}
70	return (0);
71}
72
73void
74verifydir(char *cp)
75{
76	struct stat stb;
77
78	if (!stat(cp, &stb)) {
79		if (S_ISDIR(stb.st_mode))
80			return;
81		errno = ENOTDIR;
82	}
83	run_err("%s: %s", cp, strerror(errno));
84	exit(1);
85}
86
87int
88okname(char *cp0)
89{
90	int c;
91	char *cp;
92
93	cp = cp0;
94	do {
95		c = *cp;
96		if (c & 0200)
97			goto bad;
98		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-' && c != '.')
99			goto bad;
100	} while (*++cp);
101	return (1);
102
103bad:	warnx("%s: invalid user name", cp0);
104	return (0);
105}
106
107int
108susystem(char *s, int userid)
109{
110	sig_t istat, qstat;
111	int status;
112	pid_t pid;
113
114	pid = vfork();
115	switch (pid) {
116	case -1:
117		return (127);
118
119	case 0:
120		(void)setuid(userid);
121		execl(_PATH_BSHELL, "sh", "-c", s, (char *)NULL);
122		_exit(127);
123	}
124	istat = signal(SIGINT, SIG_IGN);
125	qstat = signal(SIGQUIT, SIG_IGN);
126	if (waitpid(pid, &status, 0) < 0)
127		status = -1;
128	(void)signal(SIGINT, istat);
129	(void)signal(SIGQUIT, qstat);
130	return (status);
131}
132
133BUF *
134allocbuf(BUF *bp, int fd, int blksize)
135{
136	struct stat stb;
137	size_t size;
138
139	if (fstat(fd, &stb) < 0) {
140		run_err("fstat: %s", strerror(errno));
141		return (0);
142	}
143	size = roundup(stb.st_blksize, blksize);
144	if (size == 0)
145		size = blksize;
146	if (bp->cnt >= size)
147		return (bp);
148	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
149		bp->cnt = 0;
150		run_err("%s", strerror(errno));
151		return (0);
152	}
153	bp->cnt = size;
154	return (bp);
155}
156
157void
158lostconn(int signo)
159{
160	if (!iamremote)
161		warnx("lost connection");
162	exit(1);
163}
164