xref: /freebsd/crypto/heimdal/appl/rcp/util.c (revision 7aa383846770374466b1dcb2cefd71bde9acf463)
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
37 static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
38 #endif
39 static const char rcsid[] =
40   "$FreeBSD$";
41 #endif /* not lint */
42 #endif
43 
44 #include "rcp_locl.h"
45 
46 RCSID("$Id: util.c 17878 2006-08-08 21:43:58Z lha $");
47 
48 char *
49 colon(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 
64 void
65 verifydir(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 
79 int
80 okname(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 
96 bad:	warnx("%s: invalid user name", cp0);
97 	return (0);
98 }
99 
100 int
101 susystem(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 
133 BUF *
134 allocbuf(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 
165 void
166 lostconn(signo)
167 	int signo;
168 {
169 	if (!iamremote)
170 		warnx("lost connection");
171 	exit(1);
172 }
173