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   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2010 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37 #include <libmemcached/common.h>
  38
  39 const char * memcached_lib_version(void)
  40 {
  41   return LIBMEMCACHED_VERSION_STRING;
  42 }
  43
  44 static inline memcached_return_t memcached_version_binary(memcached_st *ptr);
  45 static inline memcached_return_t memcached_version_textual(memcached_st *ptr);
  46
  47 memcached_return_t memcached_version(memcached_st *ptr)
  48 {
  49   memcached_return_t rc;
  50   if (memcached_failed(rc= initialize_query(ptr)))
  51   {
  52     return rc;
  53   }
  54
  55   if (ptr->flags.use_udp)
  56   {
  57     return MEMCACHED_NOT_SUPPORTED;
  58   }
  59
  60   if (ptr->flags.binary_protocol)
  61   {
  62     rc= memcached_version_binary(ptr);
  63   }
  64   else
  65   {
  66     rc= memcached_version_textual(ptr);
  67   }
  68
  69   return rc;
  70 }
  71
  72 static inline memcached_return_t memcached_version_textual(memcached_st *ptr)
  73 {
  74   memcached_return_t rc= MEMCACHED_SUCCESS;
  75   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
  76   {
  77     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
  78
  79     // Optimization, we only fetch version once.
  80     if (instance->major_version != UINT8_MAX)
  81     {
  82       continue;
  83     }
  84
  85     memcached_return_t rrc= memcached_do(instance, memcached_literal_param("version\r\n"), true);
  86     if (memcached_failed(rrc))
  87     {
  88       (void)memcached_set_error(*instance, rrc, MEMCACHED_AT);
  89       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
  90       rc= MEMCACHED_SOME_ERRORS;
  91       continue;
  92     }
  93
  94     char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  95     rrc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  96     if (memcached_failed(rrc))
  97     {
  98       memcached_set_error(*instance, rrc, MEMCACHED_AT);
  99       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 100       rc= MEMCACHED_SOME_ERRORS;
 101       continue;
 102     }
 103
 104     /* Find the space, and then move one past it to copy version */
 105     char *response_ptr= index(buffer, ' ');
 106     response_ptr++;
 107
 108     long int version= strtol(response_ptr, (char **)NULL, 10);
 109     if (version == LONG_MIN or version == LONG_MAX or errno == EINVAL or version > UINT8_MAX or version == 0)
 110     {
 111       memcached_set_error(*instance, MEMCACHED_PROTOCOL_ERROR, MEMCACHED_AT, memcached_literal_param("strtol() failed to parse major version"));
 112       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 113       rc= MEMCACHED_SOME_ERRORS;
 114       continue;
 115     }
 116     instance->major_version= uint8_t(version);
 117
 118     response_ptr= index(response_ptr, '.');
 119     response_ptr++;
 120
 121     version= strtol(response_ptr, (char **)NULL, 10);
 122     if (version == LONG_MIN or version == LONG_MAX or errno == EINVAL or version > UINT8_MAX)
 123     {
 124       memcached_set_error(*instance, MEMCACHED_PROTOCOL_ERROR, MEMCACHED_AT, memcached_literal_param("strtol() failed to parse minor version"));
 125       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 126       rc= MEMCACHED_SOME_ERRORS;
 127       continue;
 128     }
 129     instance->minor_version= uint8_t(version);
 130
 131     response_ptr= index(response_ptr, '.');
 132     response_ptr++;
 133
 134     version= strtol(response_ptr, (char **)NULL, 10);
 135     if (version == LONG_MIN or version == LONG_MAX or errno == EINVAL or version > UINT8_MAX)
 136     {
 137       memcached_set_error(*instance, MEMCACHED_PROTOCOL_ERROR, MEMCACHED_AT, memcached_literal_param("strtol() failed to parse micro version"));
 138       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 139       rc= MEMCACHED_SOME_ERRORS;
 140       continue;
 141     }
 142     instance->micro_version= uint8_t(version);
 143   }
 144
 145   return rc;
 146 }
 147
 148 static inline memcached_return_t memcached_version_binary(memcached_st *ptr)
 149 {
 150   protocol_binary_request_version request= {};
 151   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 152   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_VERSION;
 153   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 154
 155   memcached_return_t rc= MEMCACHED_SUCCESS;
 156   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 157   {
 158     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 159
 160     if (instance->major_version != UINT8_MAX)
 161     {
 162       continue;
 163     }
 164
 165     memcached_return_t rrc= memcached_do(instance, request.bytes, sizeof(request.bytes), true);
 166     if (memcached_failed(rrc))
 167     {
 168       memcached_io_reset(instance);
 169       rc= MEMCACHED_SOME_ERRORS;
 170       continue;
 171     }
 172   }
 173
 174   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 175   {
 176     memcached_server_write_instance_st instance=
 177       memcached_server_instance_fetch(ptr, x);
 178
 179     if (instance->major_version != UINT8_MAX)
 180     {
 181       continue;
 182     }
 183
 184     if (memcached_server_response_count(instance) > 0)
 185     {
 186       char buffer[32];
 187       char *p;
 188
 189       memcached_return_t rrc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 190       if (memcached_failed(rrc))
 191       {
 192         memcached_io_reset(instance);
 193         rc= MEMCACHED_SOME_ERRORS;
 194         continue;
 195       }
 196
 197       long int version= strtol(buffer, &p, 10);
 198       if (version == LONG_MIN or version == LONG_MAX or errno == EINVAL or version > UINT8_MAX or version == 0)
 199       {
 200         memcached_set_error(*instance, MEMCACHED_PROTOCOL_ERROR, MEMCACHED_AT, memcached_literal_param("strtol() failed to parse major version"));
 201         instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 202         rc= MEMCACHED_SOME_ERRORS;
 203         continue;
 204       }
 205       instance->major_version= uint8_t(version);
 206
 207       version= strtol(p +1, &p, 10);
 208       if (version == LONG_MIN or version == LONG_MAX or errno == EINVAL or version > UINT8_MAX)
 209       {
 210         memcached_set_error(*instance, MEMCACHED_PROTOCOL_ERROR, MEMCACHED_AT, memcached_literal_param("strtol() failed to parse micro version"));
 211         instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 212         rc= MEMCACHED_SOME_ERRORS;
 213         continue;
 214       }
 215       instance->minor_version= uint8_t(version);
 216
 217       version= strtol(p + 1, NULL, 10);
 218       if (errno == ERANGE)
 219       {
 220         memcached_set_error(*instance, MEMCACHED_PROTOCOL_ERROR, MEMCACHED_AT, memcached_literal_param("strtol() failed to parse micro version"));
 221         instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 222         rc= MEMCACHED_SOME_ERRORS;
 223         continue;
 224       }
 225       instance->micro_version= uint8_t(version);
 226     }
 227   }
 228
 229   return rc;
 230 }