1/*
2   Unix SMB/CIFS implementation.
3   store smbd profiling information in shared memory
4   Copyright (C) Andrew Tridgell 1999
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20*/
21
22#include "includes.h"
23
24#ifdef WITH_PROFILE
25#define IPC_PERMS ((S_IRUSR | S_IWUSR) | S_IRGRP | S_IROTH)
26#endif /* WITH_PROFILE */
27
28#ifdef WITH_PROFILE
29static int shm_id;
30static BOOL read_only;
31#endif
32
33struct profile_header *profile_h;
34struct profile_stats *profile_p;
35
36BOOL do_profile_flag = False;
37BOOL do_profile_times = False;
38
39struct timeval profile_starttime;
40struct timeval profile_endtime;
41struct timeval profile_starttime_nested;
42struct timeval profile_endtime_nested;
43
44/****************************************************************************
45receive a set profile level message
46****************************************************************************/
47void profile_message(int msg_type, pid_t src, void *buf, size_t len)
48{
49        int level;
50
51	memcpy(&level, buf, sizeof(int));
52#ifdef WITH_PROFILE
53	switch (level) {
54	case 0:		/* turn off profiling */
55		do_profile_flag = False;
56		do_profile_times = False;
57		DEBUG(1,("INFO: Profiling turned OFF from pid %d\n", (int)src));
58		break;
59	case 1:		/* turn on counter profiling only */
60		do_profile_flag = True;
61		do_profile_times = False;
62		DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n", (int)src));
63		break;
64	case 2:		/* turn on complete profiling */
65		do_profile_flag = True;
66		do_profile_times = True;
67		DEBUG(1,("INFO: Full profiling turned ON from pid %d\n", (int)src));
68		break;
69	case 3:		/* reset profile values */
70		memset((char *)profile_p, 0, sizeof(*profile_p));
71		DEBUG(1,("INFO: Profiling values cleared from pid %d\n", (int)src));
72		break;
73	}
74#else /* WITH_PROFILE */
75	DEBUG(1,("INFO: Profiling support unavailable in this build.\n"));
76#endif /* WITH_PROFILE */
77}
78
79/****************************************************************************
80receive a request profile level message
81****************************************************************************/
82void reqprofile_message(int msg_type, pid_t src, void *buf, size_t len)
83{
84        int level;
85
86#ifdef WITH_PROFILE
87	level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
88#else
89	level = 0;
90#endif
91	DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",(unsigned int)src));
92	message_send_pid(src, MSG_PROFILELEVEL, &level, sizeof(int), True);
93}
94
95/*******************************************************************
96  open the profiling shared memory area
97  ******************************************************************/
98#ifdef WITH_PROFILE
99BOOL profile_setup(BOOL rdonly)
100{
101	struct shmid_ds shm_ds;
102
103	read_only = rdonly;
104
105 again:
106	/* try to use an existing key */
107	shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
108
109	/* if that failed then create one. There is a race condition here
110	   if we are running from inetd. Bad luck. */
111	if (shm_id == -1) {
112		if (read_only) return False;
113		shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h),
114				IPC_CREAT | IPC_EXCL | IPC_PERMS);
115	}
116
117	if (shm_id == -1) {
118		DEBUG(0,("Can't create or use IPC area. Error was %s\n",
119			 strerror(errno)));
120		return False;
121	}
122
123
124	profile_h = (struct profile_header *)shmat(shm_id, 0,
125						   read_only?SHM_RDONLY:0);
126	if ((long)profile_p == -1) {
127		DEBUG(0,("Can't attach to IPC area. Error was %s\n",
128			 strerror(errno)));
129		return False;
130	}
131
132	/* find out who created this memory area */
133	if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
134		DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n",
135			 strerror(errno)));
136		return False;
137	}
138
139	if (shm_ds.shm_perm.cuid != sec_initial_uid() || shm_ds.shm_perm.cgid != sec_initial_gid()) {
140		DEBUG(0,("ERROR: we did not create the shmem (owned by another user)\n"));
141		return False;
142	}
143
144	if (shm_ds.shm_segsz != sizeof(*profile_h)) {
145		DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
146			 (int)shm_ds.shm_segsz, sizeof(*profile_h)));
147		if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
148			goto again;
149		} else {
150			return False;
151		}
152	}
153
154	if (!read_only && (shm_ds.shm_nattch == 1)) {
155		memset((char *)profile_h, 0, sizeof(*profile_h));
156		profile_h->prof_shm_magic = PROF_SHM_MAGIC;
157		profile_h->prof_shm_version = PROF_SHM_VERSION;
158		DEBUG(3,("Initialised profile area\n"));
159	}
160
161	profile_p = &profile_h->stats;
162	message_register(MSG_PROFILE, profile_message);
163	message_register(MSG_REQ_PROFILELEVEL, reqprofile_message);
164	return True;
165}
166#endif /* WITH_PROFILE */
167