1.0.0beta2/src/main.c

/*
Copyright (C) 2002-2003  Erik Fears
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
 
      Foundation, Inc.
      59 Temple Place - Suite 330
      Boston, MA  02111-1307, USA.
 
*/

#include "setup.h"

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <sys/resource.h> /* getrlimit */
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>

#include "compat.h"
#include "config.h"
#include "irc.h"
#include "log.h"
#include "opercmd.h"
#include "scan.h"
#include "stats.h"
#include "negcache.h"
#include "options.h"
#include "malloc.h"
#include "firedns.h"
#include "main.h"


static int RESTART = 0;  /* Flagged to restart on next cycle */
static int ALARMED = 0;  /* Flagged to call timer functions on next cycle */
static int REOPEN  = 0;  /* Flagged to reopen log files on next cycle */

static struct sigaction ALARMACTION;
static struct sigaction INTACTION;
static struct sigaction USR1ACTION;

static char *CONFNAME = DEFAULTNAME;
static const char *CONFDIR = HOPM_ETCDIR;
static const char *LOGDIR = HOPM_LOGDIR;
static char *CONFFILE, *LOGFILE;

unsigned int OPT_DEBUG = 0;  /* Debug level */


static void
do_signal(int signum)
{
  switch (signum)
  {
    case SIGALRM:
      ALARMED = 1;
      alarm(1);
      break;
    case SIGINT:
      log_printf("MAIN -> Caught SIGINT, bye!");
      exit(0);
      break;
    case SIGUSR1:
      REOPEN = 1;
      break;
  }
}

int
main(int argc, char *argv[])
{
  pid_t pid;
  size_t lenc, lenl;
  FILE *pidout;
  struct rlimit rlim;

  while (1)
  {
    int c = getopt(argc, argv, "dc:");

    if (c == -1)
      break;

    switch (c)
    {
      case 'c':
        CONFNAME = xstrdup(optarg);
         break;
      case 'd':
        ++OPT_DEBUG;
        break;
      default:  /* Unknown arg, guess we'll just do nothing for now. */
        break;
    }
  }

  lenc = strlen(CONFDIR) + strlen(CONFNAME) + strlen(CONFEXT) + 3;
  lenl = strlen(LOGDIR) + strlen(CONFNAME) + strlen(LOGEXT) + 3;

  CONFFILE = MyMalloc(lenc * sizeof *CONFFILE);
  LOGFILE = MyMalloc(lenl * sizeof *LOGFILE);

  snprintf(CONFFILE, lenc, "%s/%s.%s", CONFDIR, CONFNAME, CONFEXT);
  snprintf(LOGFILE, lenl, "%s/%s.%s", LOGDIR, CONFNAME, LOGEXT);

  /* Fork off. */
  if (OPT_DEBUG == 0)
  {
    if ((pid = fork()) < 0)
    {
      perror("fork()");
      exit(EXIT_FAILURE);
    }
    else if (pid != 0)
      _exit(EXIT_SUCCESS);

    /* Get us in our own process group. */
    if (setpgid(0, 0) < 0)
    {
      perror("setpgid()");
      exit(EXIT_FAILURE);
    }

    /* Reset file mode. */
    /* shasta: o+w is BAD, mmkay? */
    umask(002);

    /* Close file descriptors. */
    close(STDIN_FILENO);
    close(STDOUT_FILENO);
    close(STDERR_FILENO);

    log_open(LOGFILE);
  }
  else
    log_printf("MAIN -> Debug level %d", OPT_DEBUG);

  log_printf("MAIN -> HOPM %s started.", VERSION);
  log_printf("MAIN -> Reading configuration file...");

  config_load(CONFFILE);

  if (OptionsItem->scanlog)
    scanlog_open(OptionsItem->scanlog);

  pidout = fopen(OptionsItem->pidfile, "w");

  if (pidout)
  {
    char spid[16];

    snprintf(spid, sizeof(spid), "%u", getpid());
    fwrite(spid, sizeof(char), strlen(spid), pidout);
    fclose(pidout);
  }
  else
  {
    log_printf("MAIN -> Error opening %s: %s", OptionsItem->pidfile,
               strerror(errno));
    exit(EXIT_FAILURE);
  }

  /* Setup alarm & int handlers. */
  ALARMACTION.sa_handler = &do_signal;
  ALARMACTION.sa_flags = SA_RESTART;
  INTACTION.sa_handler = &do_signal;
  USR1ACTION.sa_handler = &do_signal;

  sigaction(SIGALRM, &ALARMACTION, 0);
  sigaction(SIGINT, &INTACTION, 0);
  sigaction(SIGUSR1, &USR1ACTION, 0);

  /* Ignore SIGPIPE. */
  signal(SIGPIPE, SIG_IGN);

  alarm(1);

  while (1)
  {
    /* Main cycles */
    irc_cycle();
    scan_cycle();

    /* Restart bopm if main_restart() was called (usually happens by m_kill in irc.c) */
    if (RESTART)
    {
      /* If restarted in debug mode, die */
      if (OPT_DEBUG)
        return 1;

      log_printf("MAIN -> Restarting process");

      /* Get upper file descriptor limit */
      if (getrlimit(RLIMIT_NOFILE, &rlim) == -1)
      {
        log_printf("MAIN RESTART -> getrlimit() error retrieving RLIMIT_NOFILE (%s)", strerror(errno));
        return 1;
      }

      /* Set file descriptors 0-rlim_cur close on exec */
      for (unsigned int i = 0; i < rlim.rlim_cur; ++i)
        fcntl(i, F_SETFD, FD_CLOEXEC);

      /* execute new process */
      if (execve(argv[0], argv, NULL) == -1)
        log_printf("MAIN RESTART -> Execution of \"%s\" failed. ERROR: %s", argv[0], strerror(errno));

      /* Should only get here if execve failed */
      RESTART = 0;
    }

    /* Check for log reopen */
    if (REOPEN)
    {
      log_printf("MAIN -> Caught SIGUSR1, reopening logfiles");
      log_close();
      log_open(LOGFILE);

      if (OptionsItem->scanlog)
      {
        scanlog_close();
        scanlog_open(OptionsItem->scanlog);
      }

      log_printf("MAIN -> reopened logfiles");

      REOPEN = 0;
    }

    /* Call 1 second timers */
    if (ALARMED)
    {
      irc_timer();
      scan_timer();
      command_timer();

      ALARMED = 0;
    }
  }

  if (!OPT_DEBUG)
    log_close();

  /* If there's no scanlog open then this will do nothing anyway */
  scanlog_close();
  return 0;
}

void
main_restart(void)
{
  RESTART = 1;
}
Revision:	5236
Committed:	Wed Dec 31 15:43:14 2014 UTC (11 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	6062 byte(s)
Log Message:	RELEASE TAG 1.0.0beta2
#	Content
1	/*
2	Copyright (C) 2002-2003 Erik Fears
3
4	This program is free software; you can redistribute it and/or
5	modify it under the terms of the GNU General Public License
6	as published by the Free Software Foundation; either version 2
7	of the License, or (at your option) any later version.
8
9	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.
13
14	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software
16
17	Foundation, Inc.
18	59 Temple Place - Suite 330
19	Boston, MA 02111-1307, USA.
20
21	*/
22
23	#include "setup.h"
24
25	#include <stdio.h>
26	#include <sys/types.h>
27	#include <sys/stat.h>
28	#include <sys/socket.h>
29	#include <netinet/in.h>
30	#include <arpa/inet.h>
31	#include <signal.h>
32	#include <unistd.h>
33	#include <errno.h>
34	#include <sys/resource.h> /* getrlimit */
35	#include <fcntl.h>
36	#include <stdlib.h>
37	#include <string.h>
38
39	#include "compat.h"
40	#include "config.h"
41	#include "irc.h"
42	#include "log.h"
43	#include "opercmd.h"
44	#include "scan.h"
45	#include "stats.h"
46	#include "negcache.h"
47	#include "options.h"
48	#include "malloc.h"
49	#include "firedns.h"
50	#include "main.h"
51
52
53	static int RESTART = 0; /* Flagged to restart on next cycle */
54	static int ALARMED = 0; /* Flagged to call timer functions on next cycle */
55	static int REOPEN = 0; /* Flagged to reopen log files on next cycle */
56
57	static struct sigaction ALARMACTION;
58	static struct sigaction INTACTION;
59	static struct sigaction USR1ACTION;
60
61	static char *CONFNAME = DEFAULTNAME;
62	static const char *CONFDIR = HOPM_ETCDIR;
63	static const char *LOGDIR = HOPM_LOGDIR;
64	static char CONFFILE, LOGFILE;
65
66	unsigned int OPT_DEBUG = 0; /* Debug level */
67
68
69	static void
70	do_signal(int signum)
71	{
72	switch (signum)
73	{
74	case SIGALRM:
75	ALARMED = 1;
76	alarm(1);
77	break;
78	case SIGINT:
79	log_printf("MAIN -> Caught SIGINT, bye!");
80	exit(0);
81	break;
82	case SIGUSR1:
83	REOPEN = 1;
84	break;
85	}
86	}
87
88	int
89	main(int argc, char *argv[])
90	{
91	pid_t pid;
92	size_t lenc, lenl;
93	FILE *pidout;
94	struct rlimit rlim;
95
96	while (1)
97	{
98	int c = getopt(argc, argv, "dc:");
99
100	if (c == -1)
101	break;
102
103	switch (c)
104	{
105	case 'c':
106	CONFNAME = xstrdup(optarg);
107	break;
108	case 'd':
109	++OPT_DEBUG;
110	break;
111	default: /* Unknown arg, guess we'll just do nothing for now. */
112	break;
113	}
114	}
115
116	lenc = strlen(CONFDIR) + strlen(CONFNAME) + strlen(CONFEXT) + 3;
117	lenl = strlen(LOGDIR) + strlen(CONFNAME) + strlen(LOGEXT) + 3;
118
119	CONFFILE = MyMalloc(lenc * sizeof *CONFFILE);
120	LOGFILE = MyMalloc(lenl * sizeof *LOGFILE);
121
122	snprintf(CONFFILE, lenc, "%s/%s.%s", CONFDIR, CONFNAME, CONFEXT);
123	snprintf(LOGFILE, lenl, "%s/%s.%s", LOGDIR, CONFNAME, LOGEXT);
124
125	/* Fork off. */
126	if (OPT_DEBUG == 0)
127	{
128	if ((pid = fork()) < 0)
129	{
130	perror("fork()");
131	exit(EXIT_FAILURE);
132	}
133	else if (pid != 0)
134	_exit(EXIT_SUCCESS);
135
136	/* Get us in our own process group. */
137	if (setpgid(0, 0) < 0)
138	{
139	perror("setpgid()");
140	exit(EXIT_FAILURE);
141	}
142
143	/* Reset file mode. */
144	/* shasta: o+w is BAD, mmkay? */
145	umask(002);
146
147	/* Close file descriptors. */
148	close(STDIN_FILENO);
149	close(STDOUT_FILENO);
150	close(STDERR_FILENO);
151
152	log_open(LOGFILE);
153	}
154	else
155	log_printf("MAIN -> Debug level %d", OPT_DEBUG);
156
157	log_printf("MAIN -> HOPM %s started.", VERSION);
158	log_printf("MAIN -> Reading configuration file...");
159
160	config_load(CONFFILE);
161
162	if (OptionsItem->scanlog)
163	scanlog_open(OptionsItem->scanlog);
164
165	pidout = fopen(OptionsItem->pidfile, "w");
166
167	if (pidout)
168	{
169	char spid[16];
170
171	snprintf(spid, sizeof(spid), "%u", getpid());
172	fwrite(spid, sizeof(char), strlen(spid), pidout);
173	fclose(pidout);
174	}
175	else
176	{
177	log_printf("MAIN -> Error opening %s: %s", OptionsItem->pidfile,
178	strerror(errno));
179	exit(EXIT_FAILURE);
180	}
181
182	/* Setup alarm & int handlers. */
183	ALARMACTION.sa_handler = &do_signal;
184	ALARMACTION.sa_flags = SA_RESTART;
185	INTACTION.sa_handler = &do_signal;
186	USR1ACTION.sa_handler = &do_signal;
187
188	sigaction(SIGALRM, &ALARMACTION, 0);
189	sigaction(SIGINT, &INTACTION, 0);
190	sigaction(SIGUSR1, &USR1ACTION, 0);
191
192	/* Ignore SIGPIPE. */
193	signal(SIGPIPE, SIG_IGN);
194
195	alarm(1);
196
197	while (1)
198	{
199	/* Main cycles */
200	irc_cycle();
201	scan_cycle();
202
203	/* Restart bopm if main_restart() was called (usually happens by m_kill in irc.c) */
204	if (RESTART)
205	{
206	/* If restarted in debug mode, die */
207	if (OPT_DEBUG)
208	return 1;
209
210	log_printf("MAIN -> Restarting process");
211
212	/* Get upper file descriptor limit */
213	if (getrlimit(RLIMIT_NOFILE, &rlim) == -1)
214	{
215	log_printf("MAIN RESTART -> getrlimit() error retrieving RLIMIT_NOFILE (%s)", strerror(errno));
216	return 1;
217	}
218
219	/* Set file descriptors 0-rlim_cur close on exec */
220	for (unsigned int i = 0; i < rlim.rlim_cur; ++i)
221	fcntl(i, F_SETFD, FD_CLOEXEC);
222
223	/* execute new process */
224	if (execve(argv[0], argv, NULL) == -1)
225	log_printf("MAIN RESTART -> Execution of \"%s\" failed. ERROR: %s", argv[0], strerror(errno));
226
227	/* Should only get here if execve failed */
228	RESTART = 0;
229	}
230
231	/* Check for log reopen */
232	if (REOPEN)
233	{
234	log_printf("MAIN -> Caught SIGUSR1, reopening logfiles");
235	log_close();
236	log_open(LOGFILE);
237
238	if (OptionsItem->scanlog)
239	{
240	scanlog_close();
241	scanlog_open(OptionsItem->scanlog);
242	}
243
244	log_printf("MAIN -> reopened logfiles");
245
246	REOPEN = 0;
247	}
248
249	/* Call 1 second timers */
250	if (ALARMED)
251	{
252	irc_timer();
253	scan_timer();
254	command_timer();
255
256	ALARMED = 0;
257	}
258	}
259
260	if (!OPT_DEBUG)
261	log_close();
262
263	/* If there's no scanlog open then this will do nothing anyway */
264	scanlog_close();
265	return 0;
266	}
267
268	void
269	main_restart(void)
270	{
271	RESTART = 1;
272	}