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. 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
32 static 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: head/bin/rcp/util.c 314436 2017-02-28 23:42:47Z imp $");
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
54 char *
colon(char * cp)55 colon(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
69 void
verifydir(char * cp)70 verifydir(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
83 int
okname(char * cp0)84 okname(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
99 bad: warnx("%s: invalid user name", cp0);
100 return (0);
101 }
102
103 int
susystem(char * s,int userid)104 susystem(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
129 BUF *
allocbuf(BUF * bp,int fd,int blksize)130 allocbuf(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
153 void
lostconn(int signo __unused)154 lostconn(int signo __unused)
155 {
156 if (!iamremote)
157 warnx("lost connection");
158 exit(1);
159 }
160