rcp.tproj/util.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*-
  25  * Copyright (c) 1992, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57
  58 #include <sys/param.h>
  59 #include <sys/stat.h>
  60 #include <sys/wait.h>
  61
  62 #include <ctype.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <paths.h>
  66 #include <signal.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71
  72 #include "extern.h"
  73
  74 char *
  75 colon(cp)
  76         char *cp;
  77 {
  78         if (*cp == ':')         /* Leading colon is part of file name. */
  79                 return (0);
  80
  81         for (; *cp; ++cp) {
  82                 if (*cp == ':')
  83                         return (cp);
  84                 if (*cp == '/')
  85                         return (0);
  86         }
  87         return (0);
  88 }
  89
  90 void
  91 verifydir(cp)
  92         char *cp;
  93 {
  94         struct stat stb;
  95
  96         if (!stat(cp, &stb)) {
  97                 if (S_ISDIR(stb.st_mode))
  98                         return;
  99                 errno = ENOTDIR;
 100         }
 101         run_err("%s: %s", cp, strerror(errno));
 102         exit(1);
 103 }
 104
 105 int
 106 okname(cp0)
 107         char *cp0;
 108 {
 109         int c;
 110         char *cp;
 111
 112         cp = cp0;
 113         do {
 114                 c = *cp;
 115                 if (c & 0200)
 116                         goto bad;
 117                 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
 118                         goto bad;
 119         } while (*++cp);
 120         return (1);
 121
 122 bad:    warnx("%s: invalid user name", cp0);
 123         return (0);
 124 }
 125
 126 int
 127 susystem(s, userid)
 128         int userid;
 129         char *s;
 130 {
 131         sig_t istat, qstat;
 132         int status, w;
 133         pid_t pid;
 134
 135         pid = vfork();
 136         switch (pid) {
 137         case -1:
 138                 return (127);
 139
 140         case 0:
 141                 (void)setuid(userid);
 142                 execl(_PATH_BSHELL, "sh", "-c", s, NULL);
 143                 _exit(127);
 144         }
 145         istat = signal(SIGINT, SIG_IGN);
 146         qstat = signal(SIGQUIT, SIG_IGN);
 147         if (waitpid(pid, &status, 0) < 0)
 148                 status = -1;
 149         (void)signal(SIGINT, istat);
 150         (void)signal(SIGQUIT, qstat);
 151         return (status);
 152 }
 153
 154 BUF *
 155 allocbuf(bp, fd, blksize)
 156         BUF *bp;
 157         int fd, blksize;
 158 {
 159         struct stat stb;
 160         size_t size;
 161
 162         if (fstat(fd, &stb) < 0) {
 163                 run_err("fstat: %s", strerror(errno));
 164                 return (0);
 165         }
 166         size = roundup(stb.st_blksize, blksize);
 167         if (size == 0)
 168                 size = blksize;
 169         if (bp->cnt >= size)
 170                 return (bp);
 171         if ((bp->buf = realloc(bp->buf, size)) == NULL) {
 172                 bp->cnt = 0;
 173                 run_err("%s", strerror(errno));
 174                 return (0);
 175         }
 176         bp->cnt = size;
 177         return (bp);
 178 }
 179
 180 void
 181 lostconn(signo)
 182         int signo;
 183 {
 184         if (!iamremote)
 185                 warnx("lost connection");
 186         exit(1);
 187 }