1 /* $NetBSD: util.c,v 1.8 2005/02/17 15:25:02 xtraeme 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)util.c 8.2 (Berkeley) 4/2/94"; 36 #else 37 __RCSID("$NetBSD: util.c,v 1.8 2005/02/17 15:25:02 xtraeme Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 #include <sys/wait.h> 44 45 #include <ctype.h> 46 #include <err.h> 47 #include <errno.h> 48 #include <paths.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 57 char * 58 colon(char *cp) 59 { 60 if (*cp == ':') /* Leading colon is part of file name. */ 61 return (0); 62 63 for (; *cp; ++cp) { 64 if (*cp == ':') 65 return (cp); 66 if (*cp == '/') 67 return (0); 68 } 69 return (0); 70 } 71 72 void 73 verifydir(char *cp) 74 { 75 struct stat stb; 76 77 if (!stat(cp, &stb)) { 78 if (S_ISDIR(stb.st_mode)) 79 return; 80 errno = ENOTDIR; 81 } 82 run_err("%s: %s", cp, strerror(errno)); 83 exit(1); 84 /* NOTREACHED */ 85 } 86 87 int 88 okname(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 != '-') 99 goto bad; 100 } while (*++cp); 101 return (1); 102 103 bad: warnx("%s: invalid user name", cp0); 104 return (0); 105 } 106 107 int 108 susystem(char *s) 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 execl(_PATH_BSHELL, "sh", "-c", s, NULL); 121 _exit(127); 122 /* NOTREACHED */ 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 } 132 133 BUF * 134 allocbuf(BUF *bp, int fd, int blksize) 135 { 136 struct stat stb; 137 size_t size; 138 char *nbuf; 139 140 if (fstat(fd, &stb) < 0) { 141 run_err("fstat: %s", strerror(errno)); 142 return (0); 143 } 144 size = roundup(stb.st_blksize, blksize); 145 if (size == 0) 146 size = blksize; 147 if (bp->cnt >= size) 148 return (bp); 149 if ((nbuf = realloc(bp->buf, size)) == NULL) { 150 free(bp->buf); 151 bp->buf = NULL; 152 bp->cnt = 0; 153 run_err("%s", strerror(errno)); 154 return (0); 155 } 156 bp->buf = nbuf; 157 bp->cnt = size; 158 return (bp); 159 } 160 161 void 162 lostconn(int signo) 163 { 164 if (!iamremote) 165 warnx("lost connection"); 166 exit(1); 167 /* NOTREACHED */ 168 } 169