1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* $OpenBSD: check_script.c,v 1.4 2007/11/24 17:07:28 reyk Exp $ */
/*
* Copyright (c) 2007 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <net/if.h>
#include <limits.h>
#include <event.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <pwd.h>
#include <err.h>
#include <openssl/ssl.h>
#include "hoststated.h"
void script_sig_alarm(int);
extern struct imsgbuf *ibuf_main;
pid_t child = -1;
void
check_script(struct host *host)
{
struct ctl_script scr;
host->last_up = host->up;
host->flags &= ~(F_CHECK_SENT|F_CHECK_DONE);
scr.host = host->conf.id;
imsg_compose(ibuf_main, IMSG_SCRIPT, 0, 0, -1, &scr, sizeof(scr));
}
void
script_done(struct hoststated *env, struct ctl_script *scr)
{
struct host *host;
if ((host = host_find(env, scr->host)) == NULL)
fatalx("hce_dispatch_parent: invalid host id");
if (scr->retval < 0)
host->up = HOST_UNKNOWN;
else if (scr->retval == 0)
host->up = HOST_DOWN;
else
host->up = HOST_UP;
host->flags |= F_CHECK_DONE;
hce_notify_done(host, host->up == HOST_UP ?
"script: done" : "script: failed");
}
void
script_sig_alarm(int sig)
{
int save_errno = errno;
if (child != -1)
kill(child, SIGKILL);
errno = save_errno;
}
int
script_exec(struct hoststated *env, struct ctl_script *scr)
{
int status = 0, ret = 0;
sig_t save_quit, save_int, save_chld;
struct itimerval it;
struct timeval *tv;
const char *file, *arg;
struct host *host;
struct table *table;
struct passwd *pw;
if ((host = host_find(env, scr->host)) == NULL)
fatalx("script_exec: invalid host id");
if ((table = table_find(env, host->conf.tableid)) == NULL)
fatalx("script_exec: invalid table id");
arg = host->conf.name;
file = table->conf.path;
tv = &table->conf.timeout;
save_quit = signal(SIGQUIT, SIG_IGN);
save_int = signal(SIGINT, SIG_IGN);
save_chld = signal(SIGCHLD, SIG_DFL);
switch (child = fork()) {
case -1:
ret = -1;
goto done;
case 0:
signal(SIGQUIT, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
if ((pw = getpwnam(HOSTSTATED_USER)) == NULL)
fatal("script_exec: getpwnam");
if (chdir("/") == -1)
fatal("script_exec: chdir(\"/\")");
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
fatal("script_exec: can't drop privileges");
execlp(file, file, arg, (char *)NULL);
_exit(0);
break;
default:
/* Kill the process after a timeout */
signal(SIGALRM, script_sig_alarm);
bzero(&it, sizeof(it));
bcopy(tv, &it.it_value, sizeof(it.it_value));
setitimer(ITIMER_REAL, &it, NULL);
waitpid(child, &status, 0);
break;
}
switch (ret) {
case -1:
ret = -1;
break;
default:
if (WIFEXITED(status))
ret = WEXITSTATUS(status);
else
ret = -1;
}
done:
/* Disable the process timeout timer */
bzero(&it, sizeof(it));
setitimer(ITIMER_REAL, &it, NULL);
child = -1;
signal(SIGQUIT, save_quit);
signal(SIGINT, save_int);
signal(SIGCHLD, save_chld);
signal(SIGALRM, SIG_DFL);
return (ret);
}
|
