Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : wins hook feature, we run a specified script
5 : which can then do some custom actions
6 :
7 : Copyright (C) Stefan Metzmacher 2005
8 :
9 : This program is free software; you can redistribute it and/or modify
10 : it under the terms of the GNU General Public License as published by
11 : the Free Software Foundation; either version 3 of the License, or
12 : (at your option) any later version.
13 :
14 : This program is distributed in the hope that it will be useful,
15 : but WITHOUT ANY WARRANTY; without even the implied warranty of
16 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 : GNU General Public License for more details.
18 :
19 : You should have received a copy of the GNU General Public License
20 : along with this program. If not, see <http://www.gnu.org/licenses/>.
21 : */
22 :
23 : #include "includes.h"
24 : #include "nbt_server/nbt_server.h"
25 : #include "nbt_server/wins/winsdb.h"
26 : #include "system/filesys.h"
27 :
28 1043 : static const char *wins_hook_action_string(enum wins_hook_action action)
29 : {
30 1043 : switch (action) {
31 205 : case WINS_HOOK_ADD: return "add";
32 711 : case WINS_HOOK_MODIFY: return "refresh";
33 127 : case WINS_HOOK_DELETE: return "delete";
34 : }
35 :
36 0 : return "unknown";
37 : }
38 :
39 1077 : void wins_hook(struct winsdb_handle *h, const struct winsdb_record *rec,
40 : enum wins_hook_action action, const char *wins_hook_script)
41 : {
42 : uint32_t i, length;
43 : int child;
44 1077 : char *cmd = NULL;
45 1077 : TALLOC_CTX *tmp_mem = NULL;
46 1077 : const char *p = NULL;
47 :
48 1077 : if (!wins_hook_script || !wins_hook_script[0]) return;
49 :
50 12636 : for (p = rec->name->name; *p; p++) {
51 11593 : if (!(isalnum((int)*p) || strchr_m("._-", *p))) {
52 34 : DBG_ERR("not calling wins hook for invalid name %s\n",
53 : rec->name->name);
54 34 : return;
55 : }
56 : }
57 :
58 1043 : tmp_mem = talloc_new(h);
59 1043 : if (!tmp_mem) goto failed;
60 :
61 1043 : length = winsdb_addr_list_length(rec->addresses);
62 :
63 1043 : if (action == WINS_HOOK_MODIFY && length < 1) {
64 102 : action = WINS_HOOK_DELETE;
65 : }
66 :
67 1043 : cmd = talloc_asprintf(tmp_mem,
68 : "%s %s %s %02x %ld",
69 : wins_hook_script,
70 : wins_hook_action_string(action),
71 1043 : rec->name->name,
72 1043 : rec->name->type,
73 1043 : (long int) rec->expire_time);
74 1043 : if (!cmd) goto failed;
75 :
76 2156 : for (i=0; rec->addresses[i]; i++) {
77 1113 : cmd = talloc_asprintf_append_buffer(cmd, " %s", rec->addresses[i]->address);
78 1113 : if (!cmd) goto failed;
79 : }
80 :
81 1043 : DEBUG(10,("call wins hook '%s'\n", cmd));
82 :
83 : /* signal handling in posix really sucks - doing this in a library
84 : affects the whole app, but what else to do?? */
85 1043 : signal(SIGCHLD, SIG_IGN);
86 :
87 1043 : child = fork();
88 2086 : if (child == (pid_t)-1) {
89 0 : goto failed;
90 : }
91 :
92 2086 : if (child == 0) {
93 : /* TODO: close file handles */
94 1043 : execl("/bin/sh", "sh", "-c", cmd, NULL);
95 1043 : _exit(0);
96 : }
97 :
98 1043 : talloc_free(tmp_mem);
99 1043 : return;
100 0 : failed:
101 0 : talloc_free(tmp_mem);
102 0 : DEBUG(0,("FAILED: calling wins hook '%s'\n", wins_hook_script));
103 : }
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