sbin/hammer/cmd_remote.c

   1 /*
   2  * Copyright (c) 2012 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "hammer.h"
  36
  37 #define REMOTE_MAXARGS  256
  38
  39 /*
  40  * Execute SSH_ORIGINAL_COMMAND if it matches
  41  */
  42 void
  43 hammer_cmd_sshremote(const char *cmd, const char *target)
  44 {
  45         char *env, *str, *dup;
  46         const char *av[REMOTE_MAXARGS + 1];
  47         int ac;
  48
  49         if ((env = getenv("SSH_ORIGINAL_COMMAND")) == NULL) {
  50                 errx(1, "SSH_ORIGINAL_COMMAND env missing");
  51                 /* not reached */
  52         }
  53
  54         dup = env = strdup(env);
  55         av[0] = "hammer";
  56         av[1] = "-R";
  57         av[2] = cmd;
  58         av[3] = "-T";
  59         av[4] = target;
  60         ac = 5;
  61
  62         str = strsep(&env, " \t\r\n");
  63         if (str == NULL) {
  64                 errx(1, "hammer-remote: null command");
  65                 /* not reached */
  66         }
  67
  68         if (strstr(str, "hammer") == NULL) {
  69                 errx(1, "hammer-remote: Command not 'hammer'");
  70                 /* not reached */
  71         }
  72
  73         while (ac < REMOTE_MAXARGS) {
  74                 av[ac] = strsep(&env, " \t\r\n");
  75                 ++ac;
  76                 if (av[ac - 1] == NULL)
  77                         break;
  78         }
  79         free(dup);
  80         execv("/sbin/hammer", (void *)av);
  81         err(1, "hammer-remote: execv failed");
  82         /* not reached */
  83 }