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[fs/lustre-release.git] / lustre / liblustre / lutil.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 only,
10  * as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License version 2 for more details (a copy is included
16  * in the LICENSE file that accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License
19  * version 2 along with this program; If not, see
20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
21  *
22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23  * CA 95054 USA or visit www.sun.com if you need additional information or
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
30  * Use is subject to license terms.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36
37 #include <stdlib.h>
38 #include <string.h>
39 #include <assert.h>
40 #include <signal.h>
41 #include <sys/types.h>
42
43 #include <fcntl.h>
44 #ifdef HAVE_NETDB_H
45 #include <netdb.h>
46 #endif
47 #ifdef _AIX
48 #include "syscall_AIX.h"
49 #else
50 #include <syscall.h>
51 #endif
52 #include <sys/utsname.h>
53 #ifdef HAVE_NETINET_IN_H
54 #include <netinet/in.h>
55 #endif
56 #include <sys/socket.h>
57 #ifdef HAVE_ARPA_INET_H
58 #include <arpa/inet.h>
59 #endif
60 #ifdef HAVE_CATAMOUNT_DATA_H
61 #include <catamount/data.h>
62 #endif
63
64 #include "lutil.h"
65
66
67 unsigned int libcfs_subsystem_debug = ~0 - (S_LNET | S_LND);
68 unsigned int libcfs_debug = 0;
69
70 struct task_struct     *current;
71
72 void *inter_module_get(char *arg)
73 {
74         if (!strcmp(arg, "ldlm_cli_cancel_unused"))
75                 return ldlm_cli_cancel_unused;
76         else if (!strcmp(arg, "ldlm_namespace_cleanup"))
77                 return ldlm_namespace_cleanup;
78         else if (!strcmp(arg, "ldlm_replay_locks"))
79                 return ldlm_replay_locks;
80         else if (!strcmp(arg, "osc_quota_interface"))
81                 return &osc_quota_interface;
82         else if (!strcmp(arg, "mdc_quota_interface"))
83                 return &mdc_quota_interface;
84         else if (!strcmp(arg, "lov_quota_interface"))
85                 return &lov_quota_interface;
86         else
87                 return NULL;
88 }
89
90 /*
91  * random number generator stuff
92  */
93
94 #ifdef HAVE_GETHOSTBYNAME
95 static int get_ipv4_addr()
96 {
97         struct utsname myname;
98         struct hostent *hptr;
99         int ip;
100
101         if (uname(&myname) < 0)
102                 return 0;
103
104         hptr = gethostbyname(myname.nodename);
105         if (hptr == NULL ||
106             hptr->h_addrtype != AF_INET ||
107             *hptr->h_addr_list == NULL) {
108                 CWARN("Warning: fail to get local IPv4 address\n");
109                 return 0;
110         }
111
112         ip = ntohl(*((int *) *hptr->h_addr_list));
113
114         return ip;
115 }
116 #endif
117
118 void liblustre_init_random()
119 {
120         int seed[2];
121         struct timeval tv;
122
123 #ifdef LIBLUSTRE_USE_URANDOM
124         int _rand_dev_fd;
125         _rand_dev_fd = syscall(SYS_open, "/dev/urandom", O_RDONLY);
126         if (_rand_dev_fd >= 0) {
127                 if (syscall(SYS_read, _rand_dev_fd,
128                             &seed, sizeof(seed)) == sizeof(seed)) {
129                         ll_srand(seed[0], seed[1]);
130                         syscall(SYS_close, _rand_dev_fd);
131                         return;
132                 }
133                 syscall(SYS_close, _rand_dev_fd);
134         }
135 #endif /* LIBLUSTRE_USE_URANDOM */
136
137 #ifdef HAVE_GETHOSTBYNAME
138         seed[0] = get_ipv4_addr();
139 #else
140         seed[0] = _my_pnid;
141 #endif
142         gettimeofday(&tv, NULL);
143         ll_srand(tv.tv_sec ^ __swab32(seed[0]), tv.tv_usec ^__swab32(getpid()));
144 }
145
146 static void init_capability(__u32 *res)
147 {
148 #ifdef HAVE_LIBCAP
149         cap_t syscap;
150         cap_flag_value_t capval;
151         int i;
152
153         *res = 0;
154
155         syscap = cap_get_proc();
156         if (!syscap) {
157                 CWARN("Warning: failed to get system capability, "
158                       "set to minimal\n");
159                 return;
160         }
161
162         for (i = 0; i < sizeof(cap_value_t) * 8; i++) {
163                 if (!cap_get_flag(syscap, i, CAP_EFFECTIVE, &capval)) {
164                         if (capval == CAP_SET) {
165                                 *res |= 1 << i;
166                         }
167                 }
168         }
169 #else
170         /*
171          * set fake cap flags to ship to linux server
172          * from client platforms that have none (eg. catamount)
173          *  full capability for root
174          *  no capability for anybody else
175          */
176 #define FAKE_ROOT_CAP 0x1ffffeff
177 #define FAKE_USER_CAP 0
178
179         *res = (current->fsuid == 0) ? FAKE_ROOT_CAP: FAKE_USER_CAP;
180 #endif
181 }
182
183 int in_group_p(gid_t gid)
184 {
185         int i;
186
187         if (gid == current->fsgid)
188                 return 1;
189
190         for (i = 0; i < current->ngroups; i++) {
191                 if (gid == current->groups[i])
192                         return 1;
193         }
194
195         return 0;
196 }
197
198 int liblustre_init_current(char *comm)
199 {
200         current = malloc(sizeof(*current));
201         if (!current) {
202                 CERROR("Not enough memory\n");
203                 return -ENOMEM;
204         }
205
206         strncpy(current->comm, comm, sizeof(current->comm));
207         current->pid = getpid();
208         current->fsuid = geteuid();
209         current->fsgid = getegid();
210         memset(&current->pending, 0, sizeof(current->pending));
211
212         current->max_groups = sysconf(_SC_NGROUPS_MAX);
213         current->groups = malloc(sizeof(gid_t) * current->max_groups);
214         if (!current->groups) {
215                 CERROR("Not enough memory\n");
216                 return -ENOMEM;
217         }
218         current->ngroups = getgroups(current->max_groups, current->groups);
219         if (current->ngroups < 0) {
220                 perror("Error getgroups");
221                 return -EINVAL;
222         }
223
224         init_capability(&current->cap_effective);
225
226         return 0;
227 }
228
229 void cfs_cap_raise(cfs_cap_t cap)
230 {
231         current->cap_effective |= (1 << cap);
232 }
233
234 void cfs_cap_lower(cfs_cap_t cap)
235 {
236         current->cap_effective &= ~(1 << cap);
237 }
238
239 int cfs_cap_raised(cfs_cap_t cap)
240 {
241         return current->cap_effective & (1 << cap);
242 }
243
244 void cfs_kernel_cap_pack(cfs_kernel_cap_t kcap, cfs_cap_t *cap)
245 {
246         *cap = kcap;
247 }
248
249 void cfs_kernel_cap_unpack(cfs_kernel_cap_t *kcap, cfs_cap_t cap)
250 {
251         *kcap = cap;
252 }
253
254 cfs_cap_t cfs_curproc_cap_pack(void) {
255         cfs_cap_t cap;
256         cfs_kernel_cap_pack(cfs_current()->cap_effective, &cap);
257         return cap;
258 }
259
260 void cfs_curproc_cap_unpack(cfs_cap_t cap) {
261         cfs_kernel_cap_unpack(&cfs_current()->cap_effective, cap);
262 }
263
264 int cfs_capable(cfs_cap_t cap)
265 {
266         return cfs_cap_raised(cap);
267 }
268
269 int init_lib_portals()
270 {
271         int rc;
272         ENTRY;
273
274         rc = libcfs_debug_init(5 * 1024 * 1024);
275         if (rc != 0) {
276                 CERROR("libcfs_debug_init() failed: %d\n", rc);
277                 RETURN (-ENXIO);
278         }
279
280         rc = LNetInit();
281         if (rc != 0) {
282                 CERROR("LNetInit() failed: %d\n", rc);
283                 RETURN (-ENXIO);
284         }
285         RETURN(0);
286 }
287
288 extern void ptlrpc_exit_portals(void);
289 void cleanup_lib_portals()
290 {
291         libcfs_debug_cleanup();
292         ptlrpc_exit_portals();
293 }