lustre/liblustre/lutil.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2004 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <assert.h>
  25 #include <signal.h>
  26 #include <sys/types.h>
  27
  28 #include <fcntl.h>
  29 #ifdef HAVE_NETDB_H
  30 #include <netdb.h>
  31 #endif
  32 #ifdef _AIX
  33 #include "syscall_AIX.h"
  34 #else
  35 #include <syscall.h>
  36 #endif
  37 #include <sys/utsname.h>
  38 #ifdef HAVE_NETINET_IN_H
  39 #include <netinet/in.h>
  40 #endif
  41 #include <sys/socket.h>
  42 #ifdef HAVE_ARPA_INET_H
  43 #include <arpa/inet.h>
  44 #endif
  45 #ifdef HAVE_CATAMOUNT_DATA_H
  46 #include <catamount/data.h>
  47 #endif
  48
  49 #include "lutil.h"
  50
  51
  52 unsigned int libcfs_subsystem_debug = ~0 - (S_LNET | S_LND);
  53 unsigned int libcfs_debug = 0;
  54
  55 struct task_struct     *current;
  56
  57 void *inter_module_get(char *arg)
  58 {
  59         if (!strcmp(arg, "ldlm_cli_cancel_unused"))
  60                 return ldlm_cli_cancel_unused;
  61         else if (!strcmp(arg, "ldlm_namespace_cleanup"))
  62                 return ldlm_namespace_cleanup;
  63         else if (!strcmp(arg, "ldlm_replay_locks"))
  64                 return ldlm_replay_locks;
  65         else
  66                 return NULL;
  67 }
  68
  69 /*
  70  * random number generator stuff
  71  */
  72 #ifdef LIBLUSTRE_USE_URANDOM
  73 static int _rand_dev_fd = -1;
  74 #endif
  75
  76 #ifdef HAVE_GETHOSTBYNAME
  77 static int get_ipv4_addr()
  78 {
  79         struct utsname myname;
  80         struct hostent *hptr;
  81         int ip;
  82
  83         if (uname(&myname) < 0)
  84                 return 0;
  85
  86         hptr = gethostbyname(myname.nodename);
  87         if (hptr == NULL ||
  88             hptr->h_addrtype != AF_INET ||
  89             *hptr->h_addr_list == NULL) {
  90                 CWARN("Warning: fail to get local IPv4 address\n");
  91                 return 0;
  92         }
  93
  94         ip = ntohl(*((int *) *hptr->h_addr_list));
  95
  96         return ip;
  97 }
  98 #endif
  99
 100 void liblustre_init_random()
 101 {
 102         int seed;
 103         struct timeval tv;
 104
 105 #ifdef LIBLUSTRE_USE_URANDOM
 106         _rand_dev_fd = syscall(SYS_open, "/dev/urandom", O_RDONLY);
 107         if (_rand_dev_fd >= 0) {
 108                 if (syscall(SYS_read, _rand_dev_fd,
 109                             &seed, sizeof(int)) == sizeof(int)) {
 110                         srand(seed);
 111                         return;
 112                 }
 113                 syscall(SYS_close, _rand_dev_fd);
 114                 _rand_dev_fd = -1;
 115         }
 116 #endif /* LIBLUSTRE_USE_URANDOM */
 117
 118 #ifdef HAVE_GETHOSTBYNAME
 119         seed = get_ipv4_addr();
 120 #else
 121         seed = _my_pnid;
 122 #endif
 123         gettimeofday(&tv, NULL);
 124         srand(tv.tv_sec + tv.tv_usec + getpid() + __swab32(seed));
 125 }
 126
 127 void get_random_bytes(void *buf, int size)
 128 {
 129         char *p = buf;
 130         LASSERT(size >= 0);
 131
 132 #ifdef LIBLUSTRE_USE_URANDOM
 133         if (_rand_dev_fd >= 0) {
 134                 if (syscall(SYS_read, _rand_dev_fd, buf, size) == size)
 135                         return;
 136                 syscall(SYS_close, _rand_dev_fd);
 137                 _rand_dev_fd = -1;
 138         }
 139 #endif
 140
 141         while (size--)
 142                 *p++ = rand();
 143 }
 144
 145 static void init_capability(int *res)
 146 {
 147 #ifdef HAVE_LIBCAP
 148         cap_t syscap;
 149         cap_flag_value_t capval;
 150         int i;
 151
 152         *res = 0;
 153
 154         syscap = cap_get_proc();
 155         if (!syscap) {
 156                 CWARN("Warning: failed to get system capability, "
 157                       "set to minimal\n");
 158                 return;
 159         }
 160
 161         for (i = 0; i < sizeof(cap_value_t) * 8; i++) {
 162                 if (!cap_get_flag(syscap, i, CAP_EFFECTIVE, &capval)) {
 163                         if (capval == CAP_SET) {
 164                                 *res |= 1 << i;
 165                         }
 166                 }
 167         }
 168 #else
 169         /*
 170          * set fake cap flags to ship to linux server
 171          * from client platforms that have none (eg. catamount)
 172          *  full capability for root
 173          *  no capability for anybody else
 174          */
 175 #define FAKE_ROOT_CAP 0x1ffffeff
 176 #define FAKE_USER_CAP 0
 177
 178         *res = (current->fsuid == 0) ? FAKE_ROOT_CAP: FAKE_USER_CAP;
 179 #endif
 180 }
 181
 182 int in_group_p(gid_t gid)
 183 {
 184         int i;
 185
 186         if (gid == current->fsgid)
 187                 return 1;
 188
 189         for (i = 0; i < current->ngroups; i++) {
 190                 if (gid == current->groups[i])
 191                         return 1;
 192         }
 193
 194         return 0;
 195 }
 196
 197 int liblustre_init_current(char *comm)
 198 {
 199         current = malloc(sizeof(*current));
 200         if (!current) {
 201                 CERROR("Not enough memory\n");
 202                 return -ENOMEM;
 203         }
 204
 205         strncpy(current->comm, comm, sizeof(current->comm));
 206         current->pid = getpid();
 207         current->fsuid = geteuid();
 208         current->fsgid = getegid();
 209         memset(&current->pending, 0, sizeof(current->pending));
 210
 211         current->max_groups = sysconf(_SC_NGROUPS_MAX);
 212         current->groups = malloc(sizeof(gid_t) * current->max_groups);
 213         if (!current->groups) {
 214                 CERROR("Not enough memory\n");
 215                 return -ENOMEM;
 216         }
 217         current->ngroups = getgroups(current->max_groups, current->groups);
 218         if (current->ngroups < 0) {
 219                 perror("Error getgroups");
 220                 return -EINVAL;
 221         }
 222
 223         init_capability(&current->cap_effective);
 224
 225         return 0;
 226 }
 227
 228 void generate_random_uuid(unsigned char uuid_out[16])
 229 {
 230         get_random_bytes(uuid_out, sizeof(uuid_out));
 231 }
 232
 233 int init_lib_portals()
 234 {
 235         int rc;
 236         ENTRY;
 237
 238         rc = LNetInit();
 239         if (rc != 0) {
 240                 CERROR("LNetInit failed: %d\n", rc);
 241                 RETURN (-ENXIO);
 242         }
 243         RETURN(0);
 244 }
 245
 246 extern void ptlrpc_exit_portals(void);
 247 void cleanup_lib_portals()
 248 {
 249         ptlrpc_exit_portals();
 250 }