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 #ifdef HAVE_QUOTA_SUPPORT
  66         else if (!strcmp(arg, "osc_quota_interface"))
  67                 return &osc_quota_interface;
  68         else if (!strcmp(arg, "mdc_quota_interface"))
  69                 return &mdc_quota_interface;
  70         else if (!strcmp(arg, "lov_quota_interface"))
  71                 return &lov_quota_interface;
  72 #endif
  73         else
  74                 return NULL;
  75 }
  76
  77 /*
  78  * random number generator stuff
  79  */
  80
  81 #ifdef HAVE_GETHOSTBYNAME
  82 static int get_ipv4_addr()
  83 {
  84         struct utsname myname;
  85         struct hostent *hptr;
  86         int ip;
  87
  88         if (uname(&myname) < 0)
  89                 return 0;
  90
  91         hptr = gethostbyname(myname.nodename);
  92         if (hptr == NULL ||
  93             hptr->h_addrtype != AF_INET ||
  94             *hptr->h_addr_list == NULL) {
  95                 CWARN("Warning: fail to get local IPv4 address\n");
  96                 return 0;
  97         }
  98
  99         ip = ntohl(*((int *) *hptr->h_addr_list));
 100
 101         return ip;
 102 }
 103 #endif
 104
 105 void liblustre_init_random()
 106 {
 107         int seed[2];
 108         struct timeval tv;
 109
 110 #ifdef LIBLUSTRE_USE_URANDOM
 111         int _rand_dev_fd;
 112         _rand_dev_fd = syscall(SYS_open, "/dev/urandom", O_RDONLY);
 113         if (_rand_dev_fd >= 0) {
 114                 if (syscall(SYS_read, _rand_dev_fd,
 115                             &seed, sizeof(seed)) == sizeof(seed)) {
 116                         ll_srand(seed[0], seed[1]);
 117                         return;
 118                 }
 119                 syscall(SYS_close, _rand_dev_fd);
 120         }
 121 #endif /* LIBLUSTRE_USE_URANDOM */
 122
 123 #ifdef HAVE_GETHOSTBYNAME
 124         seed[0] = get_ipv4_addr();
 125 #else
 126         seed[0] = _my_pnid;
 127 #endif
 128         gettimeofday(&tv, NULL);
 129         ll_srand(tv.tv_sec ^ __swab32(seed[0]), tv.tv_usec ^__swab32(getpid()));
 130 }
 131
 132 static void init_capability(__u32 *res)
 133 {
 134 #ifdef HAVE_LIBCAP
 135         cap_t syscap;
 136         cap_flag_value_t capval;
 137         int i;
 138
 139         *res = 0;
 140
 141         syscap = cap_get_proc();
 142         if (!syscap) {
 143                 CWARN("Warning: failed to get system capability, "
 144                       "set to minimal\n");
 145                 return;
 146         }
 147
 148         for (i = 0; i < sizeof(cap_value_t) * 8; i++) {
 149                 if (!cap_get_flag(syscap, i, CAP_EFFECTIVE, &capval)) {
 150                         if (capval == CAP_SET) {
 151                                 *res |= 1 << i;
 152                         }
 153                 }
 154         }
 155 #else
 156         /*
 157          * set fake cap flags to ship to linux server
 158          * from client platforms that have none (eg. catamount)
 159          *  full capability for root
 160          *  no capability for anybody else
 161          */
 162 #define FAKE_ROOT_CAP 0x1ffffeff
 163 #define FAKE_USER_CAP 0
 164
 165         *res = (current->fsuid == 0) ? FAKE_ROOT_CAP: FAKE_USER_CAP;
 166 #endif
 167 }
 168
 169 int in_group_p(gid_t gid)
 170 {
 171         int i;
 172
 173         if (gid == current->fsgid)
 174                 return 1;
 175
 176         for (i = 0; i < current->ngroups; i++) {
 177                 if (gid == current->groups[i])
 178                         return 1;
 179         }
 180
 181         return 0;
 182 }
 183
 184 int liblustre_init_current(char *comm)
 185 {
 186         current = malloc(sizeof(*current));
 187         if (!current) {
 188                 CERROR("Not enough memory\n");
 189                 return -ENOMEM;
 190         }
 191
 192         strncpy(current->comm, comm, sizeof(current->comm));
 193         current->pid = getpid();
 194         current->gid = getgid();
 195         current->fsuid = geteuid();
 196         current->fsgid = getegid();
 197         memset(&current->pending, 0, sizeof(current->pending));
 198
 199         current->max_groups = sysconf(_SC_NGROUPS_MAX);
 200         current->groups = malloc(sizeof(gid_t) * current->max_groups);
 201         if (!current->groups) {
 202                 CERROR("Not enough memory\n");
 203                 return -ENOMEM;
 204         }
 205         current->ngroups = getgroups(current->max_groups, current->groups);
 206         if (current->ngroups < 0) {
 207                 perror("Error getgroups");
 208                 return -EINVAL;
 209         }
 210
 211         init_capability(&current->cap_effective);
 212
 213         return 0;
 214 }
 215
 216 int init_lib_portals()
 217 {
 218         int rc;
 219         ENTRY;
 220
 221         rc = libcfs_debug_init(5 * 1024 * 1024);
 222         if (rc != 0) {
 223                 CERROR("libcfs_debug_init() failed: %d\n", rc);
 224                 RETURN (-ENXIO);
 225         }
 226
 227         rc = LNetInit();
 228         if (rc != 0) {
 229                 CERROR("LNetInit() failed: %d\n", rc);
 230                 RETURN (-ENXIO);
 231         }
 232         RETURN(0);
 233 }
 234
 235 extern void ptlrpc_exit_portals(void);
 236 void cleanup_lib_portals()
 237 {
 238         libcfs_debug_cleanup();
 239         ptlrpc_exit_portals();
 240 }