1 /* $NetBSD: util.c,v 1.2 1995/03/21 08:19:08 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)util.c 8.2 (Berkeley) 4/2/94"; 39 #else 40 static char rcsid[] = "$NetBSD: util.c,v 1.2 1995/03/21 08:19:08 cgd Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/stat.h> 46 #include <sys/wait.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <paths.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include "extern.h" 59 60 char * 61 colon(cp) 62 char *cp; 63 { 64 if (*cp == ':') /* Leading colon is part of file name. */ 65 return (0); 66 67 for (; *cp; ++cp) { 68 if (*cp == ':') 69 return (cp); 70 if (*cp == '/') 71 return (0); 72 } 73 return (0); 74 } 75 76 void 77 verifydir(cp) 78 char *cp; 79 { 80 struct stat stb; 81 82 if (!stat(cp, &stb)) { 83 if (S_ISDIR(stb.st_mode)) 84 return; 85 errno = ENOTDIR; 86 } 87 run_err("%s: %s", cp, strerror(errno)); 88 exit(1); 89 } 90 91 int 92 okname(cp0) 93 char *cp0; 94 { 95 int c; 96 char *cp; 97 98 cp = cp0; 99 do { 100 c = *cp; 101 if (c & 0200) 102 goto bad; 103 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-') 104 goto bad; 105 } while (*++cp); 106 return (1); 107 108 bad: warnx("%s: invalid user name", cp0); 109 return (0); 110 } 111 112 int 113 susystem(s, userid) 114 int userid; 115 char *s; 116 { 117 sig_t istat, qstat; 118 int status, w; 119 pid_t pid; 120 121 pid = vfork(); 122 switch (pid) { 123 case -1: 124 return (127); 125 126 case 0: 127 (void)setuid(userid); 128 execl(_PATH_BSHELL, "sh", "-c", s, NULL); 129 _exit(127); 130 } 131 istat = signal(SIGINT, SIG_IGN); 132 qstat = signal(SIGQUIT, SIG_IGN); 133 if (waitpid(pid, &status, 0) < 0) 134 status = -1; 135 (void)signal(SIGINT, istat); 136 (void)signal(SIGQUIT, qstat); 137 return (status); 138 } 139 140 BUF * 141 allocbuf(bp, fd, blksize) 142 BUF *bp; 143 int fd, blksize; 144 { 145 struct stat stb; 146 size_t size; 147 148 if (fstat(fd, &stb) < 0) { 149 run_err("fstat: %s", strerror(errno)); 150 return (0); 151 } 152 size = roundup(stb.st_blksize, blksize); 153 if (size == 0) 154 size = blksize; 155 if (bp->cnt >= size) 156 return (bp); 157 if ((bp->buf = realloc(bp->buf, size)) == NULL) { 158 bp->cnt = 0; 159 run_err("%s", strerror(errno)); 160 return (0); 161 } 162 bp->cnt = size; 163 return (bp); 164 } 165 166 void 167 lostconn(signo) 168 int signo; 169 { 170 if (!iamremote) 171 warnx("lost connection"); 172 exit(1); 173 } 174