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 [sun.com URL with a
  20  * copy of GPLv2].
  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 <sys/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 #ifdef HAVE_QUOTA_SUPPORT
  81         else if (!strcmp(arg, "osc_quota_interface"))
  82                 return &osc_quota_interface;
  83         else if (!strcmp(arg, "mdc_quota_interface"))
  84                 return &mdc_quota_interface;
  85         else if (!strcmp(arg, "lov_quota_interface"))
  86                 return &lov_quota_interface;
  87 #endif
  88         else
  89                 return NULL;
  90 }
  91
  92 /*
  93  * random number generator stuff
  94  */
  95
  96 #ifdef HAVE_GETHOSTBYNAME
  97 static int get_ipv4_addr()
  98 {
  99         struct utsname myname;
 100         struct hostent *hptr;
 101         int ip;
 102
 103         if (uname(&myname) < 0)
 104                 return 0;
 105
 106         hptr = gethostbyname(myname.nodename);
 107         if (hptr == NULL ||
 108             hptr->h_addrtype != AF_INET ||
 109             *hptr->h_addr_list == NULL) {
 110                 CWARN("Warning: fail to get local IPv4 address\n");
 111                 return 0;
 112         }
 113
 114         ip = ntohl(*((int *) *hptr->h_addr_list));
 115
 116         return ip;
 117 }
 118 #endif
 119
 120 void liblustre_init_random()
 121 {
 122         int seed[2];
 123         struct timeval tv;
 124
 125 #ifdef LIBLUSTRE_USE_URANDOM
 126         int _rand_dev_fd;
 127         _rand_dev_fd = syscall(SYS_open, "/dev/urandom", O_RDONLY);
 128         if (_rand_dev_fd >= 0) {
 129                 if (syscall(SYS_read, _rand_dev_fd,
 130                             &seed, sizeof(seed)) == sizeof(seed)) {
 131                         ll_srand(seed[0], seed[1]);
 132                         return;
 133                 }
 134                 syscall(SYS_close, _rand_dev_fd);
 135         }
 136 #endif /* LIBLUSTRE_USE_URANDOM */
 137
 138 #ifdef HAVE_GETHOSTBYNAME
 139         seed[0] = get_ipv4_addr();
 140 #else
 141         seed[0] = _my_pnid;
 142 #endif
 143         gettimeofday(&tv, NULL);
 144         ll_srand(tv.tv_sec ^ __swab32(seed[0]), tv.tv_usec ^__swab32(getpid()));
 145 }
 146
 147 static void init_capability(__u32 *res)
 148 {
 149 #ifdef HAVE_LIBCAP
 150         cap_t syscap;
 151         cap_flag_value_t capval;
 152         int i;
 153
 154         *res = 0;
 155
 156         syscap = cap_get_proc();
 157         if (!syscap) {
 158                 CWARN("Warning: failed to get system capability, "
 159                       "set to minimal\n");
 160                 return;
 161         }
 162
 163         for (i = 0; i < sizeof(cap_value_t) * 8; i++) {
 164                 if (!cap_get_flag(syscap, i, CAP_EFFECTIVE, &capval)) {
 165                         if (capval == CAP_SET) {
 166                                 *res |= 1 << i;
 167                         }
 168                 }
 169         }
 170 #else
 171         /*
 172          * set fake cap flags to ship to linux server
 173          * from client platforms that have none (eg. catamount)
 174          *  full capability for root
 175          *  no capability for anybody else
 176          */
 177 #define FAKE_ROOT_CAP 0x1ffffeff
 178 #define FAKE_USER_CAP 0
 179
 180         *res = (current->fsuid == 0) ? FAKE_ROOT_CAP: FAKE_USER_CAP;
 181 #endif
 182 }
 183
 184 int in_group_p(gid_t gid)
 185 {
 186         int i;
 187
 188         if (gid == current->fsgid)
 189                 return 1;
 190
 191         for (i = 0; i < current->ngroups; i++) {
 192                 if (gid == current->groups[i])
 193                         return 1;
 194         }
 195
 196         return 0;
 197 }
 198
 199 int liblustre_init_current(char *comm)
 200 {
 201         current = malloc(sizeof(*current));
 202         if (!current) {
 203                 CERROR("Not enough memory\n");
 204                 return -ENOMEM;
 205         }
 206
 207         strncpy(current->comm, comm, sizeof(current->comm));
 208         current->pid = getpid();
 209         current->gid = getgid();
 210         current->fsuid = geteuid();
 211         current->fsgid = getegid();
 212         memset(&current->pending, 0, sizeof(current->pending));
 213
 214         current->max_groups = sysconf(_SC_NGROUPS_MAX);
 215         current->groups = malloc(sizeof(gid_t) * current->max_groups);
 216         if (!current->groups) {
 217                 CERROR("Not enough memory\n");
 218                 return -ENOMEM;
 219         }
 220         current->ngroups = getgroups(current->max_groups, current->groups);
 221         if (current->ngroups < 0) {
 222                 perror("Error getgroups");
 223                 return -EINVAL;
 224         }
 225
 226         init_capability(&current->cap_effective);
 227
 228         return 0;
 229 }
 230
 231 int init_lib_portals()
 232 {
 233         int rc;
 234         ENTRY;
 235
 236         rc = libcfs_debug_init(5 * 1024 * 1024);
 237         if (rc != 0) {
 238                 CERROR("libcfs_debug_init() failed: %d\n", rc);
 239                 RETURN (-ENXIO);
 240         }
 241
 242         rc = LNetInit();
 243         if (rc != 0) {
 244                 CERROR("LNetInit() failed: %d\n", rc);
 245                 RETURN (-ENXIO);
 246         }
 247         RETURN(0);
 248 }
 249
 250 extern void ptlrpc_exit_portals(void);
 251 void cleanup_lib_portals()
 252 {
 253         libcfs_debug_cleanup();
 254         ptlrpc_exit_portals();
 255 }