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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31#if 0
32static const char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
33#endif
34#endif /* not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: src/bin/rcp/util.c,v 1.17 2004/04/06 20:06:50 markm Exp $");
37
38#include <sys/param.h>
39#include <sys/stat.h>
40#include <sys/wait.h>
41
42#include <ctype.h>
43#include <err.h>
44#include <errno.h>
45#include <paths.h>
46#include <signal.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <unistd.h>
51
52#include "extern.h"
53
54char *
55colon(char *cp)
56{
57	if (*cp == ':')		/* Leading colon is part of file name. */
58		return (0);
59
60	for (; *cp; ++cp) {
61		if (*cp == ':')
62			return (cp);
63		if (*cp == '/')
64			return (0);
65	}
66	return (0);
67}
68
69void
70verifydir(char *cp)
71{
72	struct stat stb;
73
74	if (!stat(cp, &stb)) {
75		if (S_ISDIR(stb.st_mode))
76			return;
77		errno = ENOTDIR;
78	}
79	run_err("%s: %s", cp, strerror(errno));
80	exit(1);
81}
82
83int
84okname(char *cp0)
85{
86	int c;
87	char *cp;
88
89	cp = cp0;
90	do {
91		c = *cp;
92		if (c & 0200)
93			goto bad;
94		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-' && c != '.')
95			goto bad;
96	} while (*++cp);
97	return (1);
98
99bad:	warnx("%s: invalid user name", cp0);
100	return (0);
101}
102
103int
104susystem(char *s, int userid)
105{
106	sig_t istat, qstat;
107	int status;
108	pid_t pid;
109
110	pid = vfork();
111	switch (pid) {
112	case -1:
113		return (127);
114
115	case 0:
116		(void)setuid(userid);
117		execl(_PATH_BSHELL, "sh", "-c", s, (char *)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
129BUF *
130allocbuf(BUF *bp, int fd, int blksize)
131{
132	struct stat stb;
133	size_t size;
134
135	if (fstat(fd, &stb) < 0) {
136		run_err("fstat: %s", strerror(errno));
137		return (0);
138	}
139	size = roundup(stb.st_blksize, blksize);
140	if (size == 0)
141		size = blksize;
142	if (bp->cnt >= size)
143		return (bp);
144	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
145		bp->cnt = 0;
146		run_err("%s", strerror(errno));
147		return (0);
148	}
149	bp->cnt = size;
150	return (bp);
151}
152
153void
154lostconn(int signo __unused)
155{
156	if (!iamremote)
157		warnx("lost connection");
158	exit(1);
159}
160