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Viewing changes to source4/nbt_server/wins/wins_hook.c

  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
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source4/nbt_server/wins/wins_hook.c
 
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/* 
 
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   Unix SMB/CIFS implementation.
 
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   wins hook feature, we run a specified script
 
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   which can then do some custom actions
 
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   Copyright (C) Stefan Metzmacher      2005
 
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   This program is free software; you can redistribute it and/or modify
 
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   it under the terms of the GNU General Public License as published by
 
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   the Free Software Foundation; either version 3 of the License, or
 
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   (at your option) any later version.
 
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   This program is distributed in the hope that it will be useful,
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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   GNU General Public License for more details.
 
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   You should have received a copy of the GNU General Public License
 
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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*/
 
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#include "includes.h"
 
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#include "nbt_server/nbt_server.h"
 
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#include "nbt_server/wins/winsdb.h"
 
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#include "system/filesys.h"
 
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static const char *wins_hook_action_string(enum wins_hook_action action)
 
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{
 
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        switch (action) {
 
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        case WINS_HOOK_ADD:     return "add";
 
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        case WINS_HOOK_MODIFY:  return "refresh";
 
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        case WINS_HOOK_DELETE:  return "delete";
 
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        }
 
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        return "unknown";
 
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}
 
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void wins_hook(struct winsdb_handle *h, const struct winsdb_record *rec, 
 
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               enum wins_hook_action action, const char *wins_hook_script)
 
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{
 
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        uint32_t i, length;
 
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        int child;
 
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        char *cmd = NULL;
 
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        TALLOC_CTX *tmp_mem = NULL;
 
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        if (!wins_hook_script || !wins_hook_script[0]) return;
 
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        tmp_mem = talloc_new(h);
 
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        if (!tmp_mem) goto failed;
 
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        length = winsdb_addr_list_length(rec->addresses);
 
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        if (action == WINS_HOOK_MODIFY && length < 1) {
 
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                action = WINS_HOOK_DELETE;
 
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        }
 
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        cmd = talloc_asprintf(tmp_mem,
 
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                              "%s %s %s %02x %ld",
 
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                              wins_hook_script,
 
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                              wins_hook_action_string(action),
 
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                              rec->name->name,
 
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                              rec->name->type,
 
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                              rec->expire_time);
 
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        if (!cmd) goto failed;
 
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        for (i=0; rec->addresses[i]; i++) {
 
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                cmd = talloc_asprintf_append_buffer(cmd, " %s", rec->addresses[i]->address);
 
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                if (!cmd) goto failed;
 
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        }
 
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        DEBUG(10,("call wins hook '%s'\n", cmd));
 
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        /* signal handling in posix really sucks - doing this in a library
 
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           affects the whole app, but what else to do?? */
 
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        signal(SIGCHLD, SIG_IGN);
 
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        child = fork();
 
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        if (child == (pid_t)-1) {
 
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                goto failed;
 
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        }
 
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        if (child == 0) {
 
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/* TODO: close file handles */
 
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                execl("/bin/sh", "sh", "-c", cmd, NULL);
 
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                _exit(0);
 
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        }
 
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        talloc_free(tmp_mem);
 
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        return;
 
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failed:
 
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        talloc_free(tmp_mem);
 
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        DEBUG(0,("FAILED: calling wins hook '%s'\n", wins_hook_script));
 
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}