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(mem_ctx);
  34         if (ev == NULL) {
  35                 d_fprintf(stderr, "ERROR: could not init event context\n");
  36                 goto fail;
  37         }
  38         msg = messaging_init(mem_ctx, procid_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(mem_ctx, 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 struct net_g_lock_do_state {
  61         const char *cmd;
  62         int result;
  63 };
  64
  65 static void net_g_lock_do_fn(void *private_data)
  66 {
  67         struct net_g_lock_do_state *state =
  68                 (struct net_g_lock_do_state *)private_data;
  69         state->result = system(state->cmd);
  70 }
  71
  72 static int net_g_lock_do(struct net_context *c, int argc, const char **argv)
  73 {
  74         struct net_g_lock_do_state state;
  75         const char *name, *cmd;
  76         int timeout;
  77         NTSTATUS status;
  78
  79         if (argc != 3) {
  80                 d_printf("Usage: net g_lock do <lockname> <timeout> "
  81                          "<command>\n");
  82                 return -1;
  83         }
  84         name = argv[0];
  85         timeout = atoi(argv[1]);
  86         cmd = argv[2];
  87
  88         state.cmd = cmd;
  89         state.result = -1;
  90
  91         status = g_lock_do(name, G_LOCK_WRITE,
  92                            timeval_set(timeout / 1000, timeout % 1000),
  93                            procid_self(), net_g_lock_do_fn, &state);
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 d_fprintf(stderr, "ERROR: g_lock_do failed: %s\n",
  96                           nt_errstr(status));
  97                 goto done;
  98         }
  99         if (state.result == -1) {
 100                 d_fprintf(stderr, "ERROR: system() returned %s\n",
 101                           strerror(errno));
 102                 goto done;
 103         }
 104         d_fprintf(stderr, "command returned %d\n", state.result);
 105
 106 done:
 107         return state.result;
 108 }
 109
 110 static int net_g_lock_dump_fn(struct server_id pid, enum g_lock_type lock_type,
 111                               void *private_data)
 112 {
 113         char *pidstr;
 114
 115         pidstr = procid_str(talloc_tos(), &pid);
 116         d_printf("%s: %s (%s)\n", pidstr,
 117                  (lock_type & 1) ? "WRITE" : "READ",
 118                  (lock_type & G_LOCK_PENDING) ? "pending" : "holder");
 119         TALLOC_FREE(pidstr);
 120         return 0;
 121 }
 122
 123 static int net_g_lock_dump(struct net_context *c, int argc, const char **argv)
 124 {
 125         struct tevent_context *ev = NULL;
 126         struct messaging_context *msg = NULL;
 127         struct g_lock_ctx *g_ctx = NULL;
 128         NTSTATUS status;
 129         int ret = -1;
 130
 131         if (argc != 1) {
 132                 d_printf("Usage: net g_lock dump <lockname>\n");
 133                 return -1;
 134         }
 135
 136         if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
 137                 goto done;
 138         }
 139
 140         status = g_lock_dump(g_ctx, argv[0], net_g_lock_dump_fn, NULL);
 141
 142         ret = 0;
 143 done:
 144         TALLOC_FREE(g_ctx);
 145         TALLOC_FREE(msg);
 146         TALLOC_FREE(ev);
 147         return ret;
 148 }
 149
 150 static int net_g_lock_locks_fn(const char *name, void *private_data)
 151 {
 152         d_printf("%s\n", name);
 153         return 0;
 154 }
 155
 156 static int net_g_lock_locks(struct net_context *c, int argc, const char **argv)
 157 {
 158         struct tevent_context *ev = NULL;
 159         struct messaging_context *msg = NULL;
 160         struct g_lock_ctx *g_ctx = NULL;
 161         int ret = -1;
 162
 163         if (argc != 0) {
 164                 d_printf("Usage: net g_lock locks\n");
 165                 return -1;
 166         }
 167
 168         if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
 169                 goto done;
 170         }
 171
 172         ret = g_lock_locks(g_ctx, net_g_lock_locks_fn, NULL);
 173 done:
 174         TALLOC_FREE(g_ctx);
 175         TALLOC_FREE(msg);
 176         TALLOC_FREE(ev);
 177         return ret;
 178 }
 179
 180 int net_g_lock(struct net_context *c, int argc, const char **argv)
 181 {
 182         struct functable func[] = {
 183                 {
 184                         "do",
 185                         net_g_lock_do,
 186                         NET_TRANSPORT_LOCAL,
 187                         N_("Execute a shell command under a lock"),
 188                         N_("net g_lock do <lock name> <timeout> <command>\n")
 189                 },
 190                 {
 191                         "locks",
 192                         net_g_lock_locks,
 193                         NET_TRANSPORT_LOCAL,
 194                         N_("List all locknames"),
 195                         N_("net g_lock locks\n")
 196                 },
 197                 {
 198                         "dump",
 199                         net_g_lock_dump,
 200                         NET_TRANSPORT_LOCAL,
 201                         N_("Dump a g_lock locking table"),
 202                         N_("net g_lock dump <lock name>\n")
 203                 },
 204                 {NULL, NULL, 0, NULL, NULL}
 205         };
 206
 207         return net_run_function(c, argc, argv, "net g_lock", func);
 208 }