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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ev.h>
#include "log.h"
#include "pingu_adm.h"
#include "pingu_conf.h"
#include "pingu_host.h"
#include "pingu_iface.h"
#include "pingu_netlink.h"
#ifndef DEFAULT_CONFIG
#define DEFAULT_CONFIG "/etc/pingu/pingu.conf"
#endif
#ifndef DEFAULT_PIDFILE
#define DEFAULT_PIDFILE "/var/run/pingu/pingu.pid"
#endif
int pingu_verbose = 0, pid_file_fd = 0, pingu_daemonize = 0;
char *pid_file = DEFAULT_PIDFILE;
static void print_version(const char *program)
{
printf("%s " PINGU_VERSION "\n", program);
}
int usage(const char *program)
{
print_version(program);
fprintf(stderr, "usage: %s [-dhiv] [-a ADMSOCKET] [-c CONFIG] [-p PIDFILE]\n"
"\n"
"options:\n"
" -a Use administration socket ADMSOCKET (default is "
DEFAULT_ADM_SOCKET ")\n"
" -c Read configuration from CONFIG (default is "
DEFAULT_CONFIG ")\n"
" -d Fork to background (damonize)\n"
" -h Show this help\n"
" -p Use PIDFILE as pidfile (default is "
DEFAULT_PIDFILE ")\n"
" -V Print version and exit\n"
" -v Run in verbose mode. Will log debug messages\n"
"\n",
program);
return 1;
}
static void remove_pid_file(void)
{
if (pid_file_fd != 0) {
close(pid_file_fd);
pid_file_fd = 0;
remove(pid_file);
}
}
static int daemonize(void)
{
char tmp[16];
pid_t pid;
pid = fork();
if (pid < 0)
return -1;
if (pid > 0)
exit(0);
if (setsid() < 0)
return -1;
pid = fork();
if (pid < 0)
return -1;
if (pid > 0)
exit(0);
if (chdir("/") < 0)
return -1;
pid_file_fd = open(pid_file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
if (pid_file_fd < 0) {
log_error("Unable to open %s: %s.", pid_file, strerror(errno));
return -1;
}
if (flock(pid_file_fd, LOCK_EX | LOCK_NB) < 0) {
log_error("Unable to lock pid file (already running?).");
close(pid_file_fd);
pid_file_fd = 0;
return -1;
}
ftruncate(pid_file_fd, 0);
write(pid_file_fd, tmp, sprintf(tmp, "%d\n", getpid()));
atexit(remove_pid_file);
freopen("/dev/null", "r", stdin);
freopen("/dev/null", "w", stdout);
freopen("/dev/null", "w", stderr);
umask(0);
return 0;
}
static void sigint_cb(struct ev_loop *loop, ev_signal *w, int revents)
{
ev_break(loop, EVBREAK_ALL);
}
int main(int argc, char *argv[])
{
int c;
const char *config_file = DEFAULT_CONFIG;
const char *adm_socket = DEFAULT_ADM_SOCKET;
int verbose = 0;
static struct ev_loop *loop;
static struct ev_signal signal_watcher;
while ((c = getopt(argc, argv, "a:c:dhp:Vv")) != -1) {
switch (c) {
case 'a':
adm_socket = optarg;
break;
case 'c':
config_file = optarg;
break;
case 'd':
pingu_daemonize++;
break;
case 'h':
return usage(basename(argv[0]));
case 'p':
pid_file = optarg;
break;
case 'V':
print_version(basename(argv[0]));
return 0;
case 'v':
verbose++;
break;
}
}
argc -= optind;
argv += optind;
log_init("pingu", verbose);
loop = ev_default_loop(0);
if (pingu_conf_parse(config_file) < 0)
return 1;
if (pingu_iface_init(loop) < 0)
return 1;
if (pingu_host_init(loop) < 0)
return 1;
if (pingu_adm_init(loop, adm_socket) < 0)
return 1;
if (pingu_daemonize) {
if (daemonize() == -1)
return 1;
}
kernel_init(loop);
ev_signal_init(&signal_watcher, sigint_cb, SIGINT);
ev_signal_start(loop, &signal_watcher);
ev_run(loop, 0);
log_info("Shutting down");
pingu_iface_cleanup(loop);
pingu_host_cleanup();
kernel_close();
ev_loop_destroy(loop);
return 0;
}
|
