1/*	$NetBSD$	*/
2
3/*
4 * system.c
5 */
6/* Portions of this file are subject to the following copyright(s).  See
7 * the Net-SNMP's COPYING file for more details and other copyrights
8 * that may apply:
9 */
10/***********************************************************
11        Copyright 1992 by Carnegie Mellon University
12
13                      All Rights Reserved
14
15Permission to use, copy, modify, and distribute this software and its
16documentation for any purpose and without fee is hereby granted,
17provided that the above copyright notice appear in all copies and that
18both that copyright notice and this permission notice appear in
19supporting documentation, and that the name of CMU not be
20used in advertising or publicity pertaining to distribution of the
21software without specific, written prior permission.
22
23CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
24ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
25CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
26ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
27WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
28ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
29SOFTWARE.
30******************************************************************/
31/*
32 * Portions of this file are copyrighted by:
33 * Copyright � 2003 Sun Microsystems, Inc. All rights reserved.
34 * Use is subject to license terms specified in the COPYING file
35 * distributed with the Net-SNMP package.
36 */
37/*
38 * System dependent routines go here
39 */
40#include <net-snmp/net-snmp-config.h>
41#undef PACKAGE_BUGREPORT
42#undef PACKAGE_NAME
43#undef PACKAGE_STRING
44#undef PACKAGE_TARNAME
45#undef PACKAGE_VERSION
46#include <config.h>
47
48#ifdef NEED_NETSNMP_DAEMONIZE
49
50#include <stdio.h>
51#include <ctype.h>
52#include <errno.h>
53
54#if HAVE_UNISTD_H
55#include <unistd.h>
56#endif
57#if HAVE_STDLIB_H
58#include <stdlib.h>
59#endif
60
61#if TIME_WITH_SYS_TIME
62# ifdef WIN32
63#  include <sys/timeb.h>
64# else
65#  include <sys/time.h>
66# endif
67# include <time.h>
68#else
69# if HAVE_SYS_TIME_H
70#  include <sys/time.h>
71# else
72#  include <time.h>
73# endif
74#endif
75
76#include <sys/types.h>
77
78#if HAVE_NETINET_IN_H
79#include <netinet/in.h>
80#endif
81
82#if HAVE_WINSOCK_H
83#include <winsock.h>
84#endif
85#if HAVE_SYS_SOCKET_H
86#include <sys/socket.h>
87#endif
88#if HAVE_NET_IF_H
89#include <net/if.h>
90#endif
91
92#if HAVE_SYS_SOCKIO_H
93#include <sys/sockio.h>
94#endif
95
96#if HAVE_SYS_IOCTL_H
97#include <sys/ioctl.h>
98#endif
99
100#ifdef HAVE_NLIST_H
101#include <nlist.h>
102#endif
103
104#if HAVE_SYS_FILE_H
105#include <sys/file.h>
106#endif
107
108#if HAVE_KSTAT_H
109#include <kstat.h>
110#endif
111
112#if HAVE_SYS_PARAM_H
113#include <sys/param.h>
114#endif
115#if HAVE_SYS_SYSCTL_H
116#include <sys/sysctl.h>
117#endif
118
119#if HAVE_STRING_H
120#include <string.h>
121#else
122#include <strings.h>
123#endif
124
125#if HAVE_DMALLOC_H
126#include <dmalloc.h>
127#endif
128
129#ifdef HAVE_SYS_STAT_H
130#include <sys/stat.h>
131#endif
132#if HAVE_FCNTL_H
133#include <fcntl.h>
134#endif
135
136#if defined(hpux10) || defined(hpux11)
137#include <sys/pstat.h>
138#endif
139
140#if HAVE_SYS_UTSNAME_H
141#include <sys/utsname.h>
142#endif
143
144#if HAVE_SYS_SYSTEMCFG_H
145#include <sys/systemcfg.h>
146#endif
147
148#if HAVE_SYS_SYSTEMINFO_H
149#include <sys/systeminfo.h>
150#endif
151
152#include <net-snmp/types.h>
153#include <net-snmp/output_api.h>
154#include <net-snmp/utilities.h>
155#include <net-snmp/library/system.h>    /* for "internal" definitions */
156
157#include <net-snmp/library/snmp_api.h>
158#include <net-snmp/library/read_config.h> /* for get_temp_file_pattern() */
159
160#ifndef IFF_LOOPBACK
161#	define IFF_LOOPBACK 0
162#endif
163
164#ifdef  INADDR_LOOPBACK
165# define LOOPBACK    INADDR_LOOPBACK
166#else
167# define LOOPBACK    0x7f000001
168#endif
169
170/**
171 * fork current process into the background.
172 *
173 * This function forks a process into the background, in order to
174 * become a daemon process. It does a few things along the way:
175 *
176 * - becoming a process/session group leader, and  forking a second time so
177 *   that process/session group leader can exit.
178 *
179 * - changing the working directory to /
180 *
181 * - closing stdin, stdout and stderr (unless stderr_log is set) and
182 *   redirecting them to /dev/null
183 *
184 * @param quit_immediately : indicates if the parent process should
185 *                           exit after a successful fork.
186 * @param stderr_log       : indicates if stderr is being used for
187 *                           logging and shouldn't be closed
188 * @returns -1 : fork error
189 *           0 : child process returning
190 *          >0 : parent process returning. returned value is the child PID.
191 */
192int
193netsnmp_daemonize(int quit_immediately, int stderr_log)
194{
195    int i = 0;
196    DEBUGMSGT(("daemonize","deamonizing...\n"));
197#if HAVE_WORKING_FORK
198    /*
199     * Fork to return control to the invoking process and to
200     * guarantee that we aren't a process group leader.
201     */
202    i = fork();
203    if (i != 0) {
204        /* Parent. */
205        DEBUGMSGT(("daemonize","first fork returned %d.\n", i));
206        if(i == -1) {
207            snmp_log(LOG_ERR,"first fork failed (errno %d) in "
208                     "netsnmp_daemonize()\n", errno);
209            return -1;
210        }
211        if (quit_immediately) {
212            DEBUGMSGT(("daemonize","parent exiting\n"));
213            exit(0);
214        }
215    } else {
216        /* Child. */
217#ifdef HAVE_SETSID
218        /* Become a process/session group leader. */
219        setsid();
220#endif
221        /*
222         * Fork to let the process/session group leader exit.
223         */
224        if ((i = fork()) != 0) {
225            DEBUGMSGT(("daemonize","second fork returned %d.\n", i));
226            if(i == -1) {
227                snmp_log(LOG_ERR,"second fork failed (errno %d) in "
228                         "netsnmp_daemonize()\n", errno);
229            }
230            /* Parent. */
231            exit(0);
232        }
233#ifndef WIN32
234        else {
235            /* Child. */
236
237            DEBUGMSGT(("daemonize","child continuing\n"));
238
239            /* Avoid keeping any directory in use. */
240            chdir("/");
241
242            if (!stderr_log) {
243                /*
244                 * Close inherited file descriptors to avoid
245                 * keeping unnecessary references.
246                 */
247                close(0);
248                close(1);
249                close(2);
250
251                /*
252                 * Redirect std{in,out,err} to /dev/null, just in
253                 * case.
254                 */
255                open("/dev/null", O_RDWR);
256                dup(0);
257                dup(0);
258            }
259        }
260#endif /* !WIN32 */
261    }
262#endif /* HAVE_WORKING_FORK */
263    return i;
264}
265
266#else /* !NEED_NETSNMP_DAEMONIZE */
267int netsnp_daemonize_bs;
268#endif
269