bin/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  * @(#)util.c   8.2 (Berkeley) 4/2/94
  34  * $FreeBSD: src/bin/rcp/util.c,v 1.9.2.3 2002/07/19 07:54:51 jmallett Exp $
  35  * $DragonFly: src/bin/rcp/util.c,v 1.5 2004/11/19 19:01:52 eirikn Exp $
  36  */
  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 *
  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
  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
  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
 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                 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         signal(SIGINT, istat);
 125         signal(SIGQUIT, qstat);
 126         return (status);
 127 }
 128
 129 BUF *
 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 /* ARGSUSED */
 154 void
 155 lostconn(int signo __unused)
 156 {
 157         if (!iamremote)
 158                 warnx("lost connection");
 159         exit(1);
 160 }