source3/utils/net_g_lock.c

   1 /*
   2  * Samba Unix/Linux SMB client library
   3  * Interface to the g_lock facility
   4  * Copyright (C) Volker Lendecke 2009
   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 3 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "net.h"
  22 #include "g_lock.h"
  23
  24 static bool net_g_lock_init(TALLOC_CTX *mem_ctx,
  25                             struct tevent_context **pev,
  26                             struct messaging_context **pmsg,
  27                             struct g_lock_ctx **pg_ctx)
  28 {
  29         struct tevent_context *ev = NULL;
  30         struct messaging_context *msg = NULL;
  31         struct g_lock_ctx *g_ctx = NULL;
  32
  33         ev = tevent_context_init(talloc_tos());
  34         if (ev == NULL) {
  35                 d_fprintf(stderr, "ERROR: could not init event context\n");
  36                 goto fail;
  37         }
  38         msg = messaging_init(talloc_tos(), server_id_self(), ev);
  39         if (msg == NULL) {
  40                 d_fprintf(stderr, "ERROR: could not init messaging context\n");
  41                 goto fail;
  42         }
  43         g_ctx = g_lock_ctx_init(talloc_tos(), msg);
  44         if (g_ctx == NULL) {
  45                 d_fprintf(stderr, "ERROR: could not init g_lock context\n");
  46                 goto fail;
  47         }
  48
  49         *pev = ev;
  50         *pmsg = msg;
  51         *pg_ctx = g_ctx;
  52         return true;
  53 fail:
  54         TALLOC_FREE(g_ctx);
  55         TALLOC_FREE(msg);
  56         TALLOC_FREE(ev);
  57         return false;
  58 }
  59
  60
  61 static int net_g_lock_do(struct net_context *c, int argc, const char **argv)
  62 {
  63         struct tevent_context *ev = NULL;
  64         struct messaging_context *msg = NULL;
  65         struct g_lock_ctx *g_ctx = NULL;
  66         const char *name, *cmd;
  67         int timeout, res;
  68         bool locked = false;
  69         NTSTATUS status;
  70         int ret = -1;
  71
  72         if (argc != 3) {
  73                 d_printf("Usage: net g_lock do <lockname> <timeout> "
  74                          "<command>\n");
  75                 return -1;
  76         }
  77         name = argv[0];
  78         timeout = atoi(argv[1]);
  79         cmd = argv[2];
  80
  81         if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
  82                 goto done;
  83         }
  84
  85         status = g_lock_lock(g_ctx, name, G_LOCK_WRITE,
  86                              timeval_set(timeout / 1000, timeout % 1000));
  87         if (!NT_STATUS_IS_OK(status)) {
  88                 d_fprintf(stderr, "ERROR: Could not get lock: %s\n",
  89                           nt_errstr(status));
  90                 goto done;
  91         }
  92         locked = true;
  93
  94         res = system(cmd);
  95
  96         if (res == -1) {
  97                 d_fprintf(stderr, "ERROR: system() returned %s\n",
  98                           strerror(errno));
  99                 goto done;
 100         }
 101         d_fprintf(stderr, "command returned %d\n", res);
 102
 103         ret = 0;
 104
 105 done:
 106         if (locked) {
 107                 g_lock_unlock(g_ctx, name);
 108         }
 109         TALLOC_FREE(g_ctx);
 110         TALLOC_FREE(msg);
 111         TALLOC_FREE(ev);
 112         return ret;
 113 }
 114
 115 static int net_g_lock_dump_fn(struct server_id pid, enum g_lock_type lock_type,
 116                               void *private_data)
 117 {
 118         char *pidstr;
 119
 120         pidstr = procid_str(talloc_tos(), &pid);
 121         d_printf("%s: %s (%s)\n", pidstr,
 122                  (lock_type & 1) ? "WRITE" : "READ",
 123                  (lock_type & G_LOCK_PENDING) ? "pending" : "holder");
 124         TALLOC_FREE(pidstr);
 125         return 0;
 126 }
 127
 128 static int net_g_lock_dump(struct net_context *c, int argc, const char **argv)
 129 {
 130         struct tevent_context *ev = NULL;
 131         struct messaging_context *msg = NULL;
 132         struct g_lock_ctx *g_ctx = NULL;
 133         NTSTATUS status;
 134         int ret = -1;
 135
 136         if (argc != 1) {
 137                 d_printf("Usage: net g_lock dump <lockname>\n");
 138                 return -1;
 139         }
 140
 141         if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
 142                 goto done;
 143         }
 144
 145         status = g_lock_dump(g_ctx, argv[0], net_g_lock_dump_fn, NULL);
 146
 147         ret = 0;
 148 done:
 149         TALLOC_FREE(g_ctx);
 150         TALLOC_FREE(msg);
 151         TALLOC_FREE(ev);
 152         return ret;
 153 }
 154
 155 static int net_g_lock_locks_fn(const char *name, void *private_data)
 156 {
 157         d_printf("%s\n", name);
 158         return 0;
 159 }
 160
 161 static int net_g_lock_locks(struct net_context *c, int argc, const char **argv)
 162 {
 163         struct tevent_context *ev = NULL;
 164         struct messaging_context *msg = NULL;
 165         struct g_lock_ctx *g_ctx = NULL;
 166         int ret = -1;
 167
 168         if (argc != 0) {
 169                 d_printf("Usage: net g_lock locks\n");
 170                 return -1;
 171         }
 172
 173         if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
 174                 goto done;
 175         }
 176
 177         ret = g_lock_locks(g_ctx, net_g_lock_locks_fn, NULL);
 178 done:
 179         TALLOC_FREE(g_ctx);
 180         TALLOC_FREE(msg);
 181         TALLOC_FREE(ev);
 182         return ret;
 183 }
 184
 185 int net_g_lock(struct net_context *c, int argc, const char **argv)
 186 {
 187         struct functable func[] = {
 188                 {
 189                         "do",
 190                         net_g_lock_do,
 191                         NET_TRANSPORT_LOCAL,
 192                         N_("Execute a shell command under a lock"),
 193                         N_("net g_lock do <lock name> <timeout> <command>\n")
 194                 },
 195                 {
 196                         "locks",
 197                         net_g_lock_locks,
 198                         NET_TRANSPORT_LOCAL,
 199                         N_("List all locknames"),
 200                         N_("net g_lock locks\n")
 201                 },
 202                 {
 203                         "dump",
 204                         net_g_lock_dump,
 205                         NET_TRANSPORT_LOCAL,
 206                         N_("Dump a g_lock locking table"),
 207                         N_("net g_lock dump <lock name>\n")
 208                 },
 209                 {NULL, NULL, 0, NULL, NULL}
 210         };
 211
 212         return net_run_function(c, argc, argv, "net g_lock", func);
 213 }