tests/zfs-tests/cmd/chg_usr_exec/chg_usr_exec.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <errno.h>
  32 #include <pwd.h>
  33
  34 #define EXECSHELL       "/bin/sh"
  35
  36 int
  37 main(int argc, char *argv[])
  38 {
  39         char *plogin = NULL;
  40         char cmds[BUFSIZ] = { 0 };
  41         char sep[] = " ";
  42         struct passwd *ppw = NULL;
  43         int i, len;
  44
  45         if (argc < 3 || strlen(argv[1]) == 0) {
  46                 (void) printf("\tUsage: %s <login> <commands> ...\n", argv[0]);
  47                 return (1);
  48         }
  49
  50         plogin = argv[1];
  51         len = 0;
  52         for (i = 2; i < argc; i++) {
  53                 (void) snprintf(cmds+len, sizeof (cmds)-len,
  54                     "%s%s", argv[i], sep);
  55                 len += strlen(argv[i]) + strlen(sep);
  56         }
  57
  58         if ((ppw = getpwnam(plogin)) == NULL) {
  59                 perror("getpwnam");
  60                 return (errno);
  61         }
  62         if (setgid(ppw->pw_gid) != 0) {
  63                 perror("setgid");
  64                 return (errno);
  65         }
  66         if (setuid(ppw->pw_uid) != 0) {
  67                 perror("setuid");
  68                 return (errno);
  69         }
  70
  71         if (execl(EXECSHELL, "sh",  "-c", cmds, (char *)NULL) != 0) {
  72                 perror("execl: " EXECSHELL);
  73                 return (errno);
  74         }
  75
  76         return (0);
  77 }