crypto/dist/heimdal/appl/rcp/util.c

   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: src/bin/rcp/util.c,v 1.9 1999/08/27 23:14:58 peter Exp $";
  41 #endif /* not lint */
  42 #endif
  43
  44 #include "rcp_locl.h"
  45
  46 __RCSID("$Heimdal: util.c 17878 2006-08-08 21:43:58Z lha $"
  47         "$NetBSD$");
  48
  49 char *
  50 colon(cp)
  51         char *cp;
  52 {
  53         if (*cp == ':')         /* Leading colon is part of file name. */
  54                 return (0);
  55
  56         for (; *cp; ++cp) {
  57                 if (*cp == ':')
  58                         return (cp);
  59                 if (*cp == '/')
  60                         return (0);
  61         }
  62         return (0);
  63 }
  64
  65 void
  66 verifydir(cp)
  67         char *cp;
  68 {
  69         struct stat stb;
  70
  71         if (!stat(cp, &stb)) {
  72                 if (S_ISDIR(stb.st_mode))
  73                         return;
  74                 errno = ENOTDIR;
  75         }
  76         run_err("%s: %s", cp, strerror(errno));
  77         exit(1);
  78 }
  79
  80 int
  81 okname(cp0)
  82         char *cp0;
  83 {
  84         int c;
  85         unsigned char *cp;
  86
  87         cp = (unsigned char *)cp0;
  88         do {
  89                 c = *cp;
  90                 if (c & 0200)
  91                         goto bad;
  92                 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
  93                         goto bad;
  94         } while (*++cp);
  95         return (1);
  96
  97 bad:    warnx("%s: invalid user name", cp0);
  98         return (0);
  99 }
 100
 101 int
 102 susystem(s, userid)
 103         int userid;
 104         char *s;
 105 {
 106         void (*istat)(int), (*qstat)(int);
 107         int status;
 108         pid_t pid;
 109
 110         pid = fork();
 111         switch (pid) {
 112         case -1:
 113                 return (127);
 114
 115         case 0:
 116                 if (setuid(userid) < 0)
 117                         _exit(127);
 118                 execl(_PATH_BSHELL, "sh", "-c", s, NULL);
 119                 _exit(127);
 120         }
 121         istat = signal(SIGINT, SIG_IGN);
 122         qstat = signal(SIGQUIT, SIG_IGN);
 123         if (waitpid(pid, &status, 0) < 0)
 124                 status = -1;
 125         (void)signal(SIGINT, istat);
 126         (void)signal(SIGQUIT, qstat);
 127         return (status);
 128 }
 129
 130 #ifndef roundup
 131 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 132 #endif
 133
 134 BUF *
 135 allocbuf(bp, fd, blksize)
 136         BUF *bp;
 137         int fd, blksize;
 138 {
 139         struct stat stb;
 140         size_t size;
 141         char *p;
 142
 143         if (fstat(fd, &stb) < 0) {
 144                 run_err("fstat: %s", strerror(errno));
 145                 return (0);
 146         }
 147         size = roundup(stb.st_blksize, blksize);
 148         if (size == 0)
 149                 size = blksize;
 150         if (bp->cnt >= size)
 151                 return (bp);
 152         if ((p = realloc(bp->buf, size)) == NULL) {
 153                 if (bp->buf)
 154                         free(bp->buf);
 155                 bp->buf = NULL;
 156                 bp->cnt = 0;
 157                 run_err("%s", strerror(errno));
 158                 return (0);
 159         }
 160         memset(p, 0, size);
 161         bp->buf = p;
 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 }