lib/util/server_id.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Bartlett 2011
   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 "replace.h"
  21 #include "lib/util/debug.h"
  22 #include "lib/util/fault.h"
  23 #include "lib/util/server_id.h"
  24 #include "lib/util/byteorder.h"
  25 #include "librpc/gen_ndr/server_id.h"
  26
  27 bool server_id_same_process(const struct server_id *p1,
  28                             const struct server_id *p2)
  29 {
  30         return ((p1->pid == p2->pid) && (p1->vnn == p2->vnn));
  31 }
  32
  33 bool server_id_equal(const struct server_id *p1, const struct server_id *p2)
  34 {
  35         if (!server_id_same_process(p1, p2)) {
  36                 return false;
  37         }
  38
  39         if (p1->task_id != p2->task_id) {
  40                 return false;
  41         }
  42
  43         if (p1->unique_id != p2->unique_id) {
  44                 return false;
  45         }
  46
  47         return true;
  48 }
  49
  50 char *server_id_str_buf(struct server_id id, struct server_id_buf *dst)
  51 {
  52         if (server_id_is_disconnected(&id)) {
  53                 strlcpy(dst->buf, "disconnected", sizeof(dst->buf));
  54         } else if ((id.vnn == NONCLUSTER_VNN) && (id.task_id == 0)) {
  55                 snprintf(dst->buf, sizeof(dst->buf), "%llu",
  56                          (unsigned long long)id.pid);
  57         } else if (id.vnn == NONCLUSTER_VNN) {
  58                 snprintf(dst->buf, sizeof(dst->buf), "%llu.%u",
  59                          (unsigned long long)id.pid, (unsigned)id.task_id);
  60         } else if (id.task_id == 0) {
  61                 snprintf(dst->buf, sizeof(dst->buf), "%u:%llu",
  62                          (unsigned)id.vnn, (unsigned long long)id.pid);
  63         } else {
  64                 snprintf(dst->buf, sizeof(dst->buf), "%u:%llu.%u",
  65                          (unsigned)id.vnn,
  66                          (unsigned long long)id.pid,
  67                          (unsigned)id.task_id);
  68         }
  69         return dst->buf;
  70 }
  71
  72 size_t server_id_str_buf_unique(struct server_id id, char *buf, size_t buflen)
  73 {
  74         struct server_id_buf idbuf;
  75         char unique_buf[21];    /* 2^64 is 18446744073709551616, 20 chars */
  76         size_t idlen, unique_len, needed;
  77
  78         server_id_str_buf(id, &idbuf);
  79
  80         idlen = strlen(idbuf.buf);
  81         unique_len = snprintf(unique_buf, sizeof(unique_buf), "%"PRIu64,
  82                               id.unique_id);
  83         needed = idlen + unique_len + 2;
  84
  85         if (buflen >= needed) {
  86                 memcpy(buf, idbuf.buf, idlen);
  87                 buf[idlen] = '/';
  88                 memcpy(buf + idlen + 1, unique_buf, unique_len+1);
  89         }
  90
  91         return needed;
  92 }
  93
  94 struct server_id server_id_from_string(uint32_t local_vnn,
  95                                        const char *pid_string)
  96 {
  97         struct server_id templ = {
  98                 .vnn = NONCLUSTER_VNN, .pid = UINT64_MAX
  99         };
 100         struct server_id result;
 101         int ret;
 102
 103         /*
 104          * We accept various forms with 1, 2 or 3 component forms
 105          * because the server_id_str_buf() can print different forms, and
 106          * we want backwards compatibility for scripts that may call
 107          * smbclient.
 108          */
 109
 110         result = templ;
 111         ret = sscanf(pid_string, "%"SCNu32":%"SCNu64".%"SCNu32"/%"SCNu64,
 112                      &result.vnn, &result.pid, &result.task_id,
 113                      &result.unique_id);
 114         if (ret == 4) {
 115                 return result;
 116         }
 117
 118         result = templ;
 119         ret = sscanf(pid_string, "%"SCNu32":%"SCNu64".%"SCNu32,
 120                      &result.vnn, &result.pid, &result.task_id);
 121         if (ret == 3) {
 122                 return result;
 123         }
 124
 125         result = templ;
 126         ret = sscanf(pid_string, "%"SCNu32":%"SCNu64"/%"SCNu64,
 127                      &result.vnn, &result.pid, &result.unique_id);
 128         if (ret == 3) {
 129                 return result;
 130         }
 131
 132         result = templ;
 133         ret = sscanf(pid_string, "%"SCNu32":%"SCNu64,
 134                      &result.vnn, &result.pid);
 135         if (ret == 2) {
 136                 return result;
 137         }
 138
 139         result = templ;
 140         ret = sscanf(pid_string, "%"SCNu64".%"SCNu32"/%"SCNu64,
 141                      &result.pid, &result.task_id, &result.unique_id);
 142         if (ret == 3) {
 143                 result.vnn = local_vnn;
 144                 return result;
 145         }
 146
 147         result = templ;
 148         ret = sscanf(pid_string, "%"SCNu64".%"SCNu32,
 149                      &result.pid, &result.task_id);
 150         if (ret == 2) {
 151                 result.vnn = local_vnn;
 152                 return result;
 153         }
 154
 155         result = templ;
 156         ret = sscanf(pid_string, "%"SCNu64"/%"SCNu64,
 157                      &result.pid, &result.unique_id);
 158         if (ret == 2) {
 159                 result.vnn = local_vnn;
 160                 return result;
 161         }
 162
 163         result = templ;
 164         ret = sscanf(pid_string, "%"SCNu64, &result.pid);
 165         if (ret == 1) {
 166                 result.vnn = local_vnn;
 167                 return result;
 168         }
 169
 170         if (strcmp(pid_string, "disconnected") == 0) {
 171                 server_id_set_disconnected(&result);
 172                 return result;
 173         }
 174
 175         return templ;
 176 }
 177
 178 /**
 179  * Set the serverid to the special value that represents a disconnected
 180  * client for (e.g.) durable handles.
 181  */
 182 void server_id_set_disconnected(struct server_id *id)
 183 {
 184         SMB_ASSERT(id != NULL);
 185
 186         id->pid = UINT64_MAX;
 187         id->task_id = UINT32_MAX;
 188         id->vnn = NONCLUSTER_VNN;
 189         id->unique_id = SERVERID_UNIQUE_ID_NOT_TO_VERIFY;
 190
 191         return;
 192 }
 193
 194 /**
 195  * check whether a serverid is the special placeholder for
 196  * a disconnected client
 197  */
 198 bool server_id_is_disconnected(const struct server_id *id)
 199 {
 200         struct server_id dis;
 201
 202         SMB_ASSERT(id != NULL);
 203
 204         server_id_set_disconnected(&dis);
 205
 206         return server_id_equal(id, &dis);
 207 }
 208
 209 void server_id_put(uint8_t buf[SERVER_ID_BUF_LENGTH],
 210                    const struct server_id id)
 211 {
 212         SBVAL(buf, 0,  id.pid);
 213         SIVAL(buf, 8,  id.task_id);
 214         SIVAL(buf, 12, id.vnn);
 215         SBVAL(buf, 16, id.unique_id);
 216 }
 217
 218 void server_id_get(struct server_id *id,
 219                    const uint8_t buf[SERVER_ID_BUF_LENGTH])
 220 {
 221         id->pid       = BVAL(buf, 0);
 222         id->task_id   = IVAL(buf, 8);
 223         id->vnn       = IVAL(buf, 12);
 224         id->unique_id = BVAL(buf, 16);
 225 }