my_gethwaddr() for linux/freebsd

UUID() function


BitKeeper/etc/ignore:
  Added mysys/test_gethwaddr to the ignore list
include/my_sys.h:
  my_gethwaddr()
mysys/Makefile.am:
  my_gethwaddr
sql/item_create.cc:
  UUID() function
sql/item_create.h:
  UUID() function
sql/item_strfunc.cc:
  UUID() function
sql/item_strfunc.h:
  UUID() function
sql/lex.h:
  UUID() function
sql/mysql_priv.h:
  UUID() function
sql/mysqld.cc:
  UUID() function
sql/sql_class.cc:
  cleanup

.bzrignore

@@ -646,3 +646,4 @@ vio/test-ssl
 vio/test-sslclient
 vio/test-sslserver
 vio/viotest-ssl
+mysys/test_gethwaddr

include/my_sys.h

@@ -739,6 +739,8 @@ extern ulong crc32(ulong crc, const uchar *buf, uint len);
 extern uint my_set_max_open_files(uint files);
 void my_free_open_file_info(void);
 
+my_bool my_gethwaddr(uchar *to);
+
 /* character sets */
 extern uint get_charset_number(const char *cs_name, uint cs_flags);
 extern uint get_collation_number(const char *name);

mysys/Makefile.am

@@ -39,7 +39,7 @@ libmysys_a_SOURCES =	my_init.c my_getwd.c mf_getdate.c \
 			mf_format.c mf_same.c mf_dirname.c mf_fn_ext.c \
 			my_symlink.c my_symlink2.c \
 			mf_pack.c mf_unixpath.c mf_strip.c \
-			mf_wcomp.c mf_wfile.c \
+			mf_wcomp.c mf_wfile.c my_gethwaddr.c \
 			mf_qsort.c mf_qsort2.c mf_sort.c \
 			ptr_cmp.c mf_radix.c queues.c \
 			tree.c list.c hash.c array.c string.c typelib.c \
@@ -110,5 +110,10 @@ charset2html$(EXEEXT): charset2html.c $(LIBRARIES)
 testhash$(EXEEXT): testhash.c $(LIBRARIES)
 	$(LINK) $(FLAGS) -DMAIN $(srcdir)/testhash.c $(LDADD) $(LIBS)
 
+test_gethwaddr$(EXEEXT): my_gethwaddr.c $(LIBRARIES)
+	$(CP) $(srcdir)/my_gethwaddr.c ./test_gethwaddr.c
+	$(LINK) $(FLAGS) -DMAIN  ./test_gethwaddr.c $(LDADD) $(LIBS)
+	$(RM) -f ./test_gethwaddr.c
+
 # Don't update the files from bitkeeper
 %::SCCS/s.%

mysys/my_gethwaddr.c

+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+/* get hardware address for an interface */
+/* if there are many available, any non-zero one can be used */
+
+#include "mysys_priv.h"
+#include <m_string.h>
+
+#ifndef MAIN
+static my_bool memcpy_and_test(uchar *to, uchar *from, uint len)
+{
+  uint i, res=1;
+
+  for (i=0; i < len; i++)
+    if ((*to++= *from++))
+      res=0;
+  return res;
+}
+
+#ifdef __FreeBSD__
+
+#include <net/ethernet.h>
+#include <sys/sysctl.h>
+#include <net/route.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+
+my_bool my_gethwaddr(uchar *to)
+{
+  size_t len;
+  uchar  *buf, *next, *end, *addr;
+  struct if_msghdr *ifm;
+  struct sockaddr_dl *sdl;
+  int i, res=1, mib[6]={CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0};
+
+  if (sysctl(mib, 6, NULL, &len, NULL, 0) == -1)
+    goto err;
+  if (!(buf = alloca(len)))
+    goto err;
+  if (sysctl(mib, 6, buf, &len, NULL, 0) < 0)
+    goto err;
+
+  end = buf + len;
+
+  for (next = buf ; res && next < end ; next += ifm->ifm_msglen)
+  {
+    ifm = (struct if_msghdr *)next;
+    if (ifm->ifm_type == RTM_IFINFO)
+    {
+      sdl = (struct sockaddr_dl *)(ifm + 1);
+      addr=LLADDR(sdl);
+      res=memcpy_and_test(to, addr, ETHER_ADDR_LEN);
+    }
+  }
+
+err:
+  return res;
+}
+
+#elif __linux__
+
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <net/ethernet.h>
+
+my_bool my_gethwaddr(uchar *to)
+{
+  int fd, res=1;
+  struct ifreq ifr;
+
+  fd = socket(AF_INET, SOCK_DGRAM, 0);
+  if (fd < 0)
+    goto err;
+
+  bzero(&ifr, sizeof(ifr));
+  strnmov(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
+
+  do {
+    if (ioctl(fd, SIOCGIFHWADDR, &ifr) >= 0)
+      res=memcpy_and_test(to, (uchar *)&ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
+  } while (res && (errno == 0 || errno == ENODEV) && ifr.ifr_name[3]++ < '6');
+
+  close(fd);
+err:
+  return res;
+}
+
+#else
+/* just fail */
+my_bool my_gethwaddr(uchar *to __attribute__((unused)))
+{
+  return 1;
+}
+#endif
+
+#else MAIN
+int main(int argc __attribute__((unused)),char **argv)
+{
+  uchar mac[6];
+  uint i;
+  MY_INIT(argv[0]);
+  if (my_gethwaddr(mac))
+  {
+    printf("my_gethwaddr failed with errno %d\n", errno);
+    exit(1);
+  }
+  for (i=0; i < sizeof(mac); i++)
+  {
+    if (i) printf(":");
+    printf("%02x", mac[i]);
+  }
+  printf("\n");
+  return 0;
+}
+#endif
+

sql/item_create.cc

@@ -426,6 +426,11 @@ Item *create_func_ucase(Item* a)
   return new Item_func_ucase(a);
 }
 
+Item *create_func_uuid(void)
+{
+  return new Item_func_uuid();
+}
+
 Item *create_func_version(void)
 {
   return new Item_string(NullS,server_version, 

sql/item_create.h

@@ -92,6 +92,7 @@ Item *create_func_time_format(Item *a, Item *b);
 Item *create_func_time_to_sec(Item* a);
 Item *create_func_to_days(Item* a);
 Item *create_func_ucase(Item* a);
+Item *create_func_uuid(void);
 Item *create_func_version(void);
 Item *create_func_weekday(Item* a);
 Item *create_load_file(Item* a);

sql/item_strfunc.cc

@@ -2632,3 +2632,112 @@ String *Item_func_uncompress::val_str(String *str)
   return 0;
 }
 #endif
+
+/*
+  UUID, as in
+    DCE 1.1: Remote Procedure Call,
+    Open Group Technical Standard Document Number C706, August 1997,
+    (supersedes C309 DCE: Remote Procedure Call 8/1994,
+    which was basis for ISO/IEC 11578:1996 specification)
+*/
+
+static struct rand_struct uuid_rand;
+static uint nanoseq;
+static ulonglong uuid_time=0;
+static char clock_seq_and_node_str[]="-0000-000000000000";
+
+/* we cannot use _dig_vec[] as letters should be lowercase */
+static const char hex[] = "0123456789abcdef";
+
+/* number of 100-nanosecond intervals between
+   1582-10-15 00:00:00.00 and 1970-01-01 00:00:00.00 */
+#define UUID_TIME_OFFSET ((ulonglong) 141427 * 24 * 60 * 60 * 1000 * 10 )
+
+#define UUID_VERSION      0x1000
+#define UUID_VARIANT      0x8000
+
+static ulonglong get_uuid_time()
+{
+  struct timeval tv;
+  gettimeofday(&tv,NULL);
+  return (ulonglong)tv.tv_sec*10000000 +
+         (ulonglong)tv.tv_usec*10   + UUID_TIME_OFFSET + nanoseq;
+}
+
+static void tohex(char *to, uint from, uint len)
+{
+  to+= len;
+  while (len--)
+  {
+    *--to= hex[from & 15];
+    from >>= 4;
+  }
+}
+
+static void set_clock_seq_str()
+{
+  uint16 clock_seq= ((uint)(my_rnd(&uuid_rand)*16383)) | UUID_VARIANT;
+  tohex(clock_seq_and_node_str+1, clock_seq, 4);
+  nanoseq= 0;
+}
+
+String *Item_func_uuid::val_str(String *str)
+{
+  char *s;
+  pthread_mutex_lock(&LOCK_uuid_generator);
+  if (! uuid_time) /* first UUID() call. initializing data */
+  {
+    ulong tmp=sql_rnd_with_mutex();
+    uchar mac[6];
+    int i;
+    if (my_gethwaddr(mac))
+    {
+      /*
+        generating random "hardware addr"
+        and because specs explicitly specify that it should NOT correlate
+        with a clock_seq value (initialized random below), we use a separate
+        randominit() here
+      */
+      randominit(&uuid_rand, tmp + (ulong)current_thd, tmp + query_id);
+      for (i=0; i < sizeof(mac); i++)
+        mac[i]=(uchar)(my_rnd(&uuid_rand)*255);
+    }
+    s=clock_seq_and_node_str+sizeof(clock_seq_and_node_str)-1;
+    for (i=sizeof(mac)-1 ; i>=0 ; i--)
+    {
+      *--s=hex[mac[i] & 15];
+      *--s=hex[mac[i] >> 4];
+    }
+    randominit(&uuid_rand, tmp + (ulong)start_time, tmp + bytes_sent);
+    set_clock_seq_str();
+  }
+
+  ulonglong tv=get_uuid_time();
+  if (unlikely(tv < uuid_time))
+    set_clock_seq_str();
+  else
+  if (unlikely(tv == uuid_time))
+  { /* special protection from low-res system clocks */
+    nanoseq++;
+    tv++;
+  }
+  else
+    nanoseq=0;
+  uuid_time=tv;
+  pthread_mutex_unlock(&LOCK_uuid_generator);
+
+  uint32 time_low=            tv & 0xFFFFFFFF;
+  uint16 time_mid=            (tv >> 32) & 0xFFFF;
+  uint16 time_hi_and_version= (tv >> 48) | UUID_VERSION;
+
+  str->realloc(UUID_LENGTH+1);
+  str->length(UUID_LENGTH);
+  s=(char *) str->ptr();
+  s[8]=s[13]='-';
+  tohex(s, time_low, 8);
+  tohex(s+9, time_mid, 4);
+  tohex(s+14, time_hi_and_version, 4);
+  strmov(s+18, clock_seq_and_node_str);
+  return str;
+}
+

sql/item_strfunc.h

@@ -691,3 +691,13 @@ class Item_func_uncompress: public Item_str_func
   String *val_str(String *) ZLIB_DEPENDED_FUNCTION
 };
 
+#define UUID_LENGTH (8+1+4+1+4+1+4+1+12)
+class Item_func_uuid: public Item_str_func
+{
+public:
+  Item_func_uuid(): Item_str_func() {}
+  void fix_length_and_dec() {max_length= UUID_LENGTH; }
+  const char *func_name() const{ return "uuid"; }
+  String *val_str(String *);
+};
+

sql/lex.h

@@ -674,6 +674,7 @@ static SYMBOL sql_functions[] = {
   { "UNIQUE_USERS",	SYM(UNIQUE_USERS)},
   { "UNIX_TIMESTAMP",	SYM(UNIX_TIMESTAMP)},
   { "UPPER",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ucase)},
+  { "UUID",		F_SYM(FUNC_ARG0),0,CREATE_FUNC(create_func_uuid)},
   { "VARIANCE",		SYM(VARIANCE_SYM)},
   { "VERSION",		F_SYM(FUNC_ARG0),0,CREATE_FUNC(create_func_version)},
   { "WEEK",		SYM(WEEK_SYM)},

sql/mysql_priv.h

@@ -802,7 +802,7 @@ extern char log_error_file[FN_REFLEN];
 extern double log_10[32];
 extern ulonglong keybuff_size;
 extern ulong refresh_version,flush_version, thread_id,query_id,opened_tables;
-extern ulong created_tmp_tables, created_tmp_disk_tables;
+extern ulong created_tmp_tables, created_tmp_disk_tables, bytes_sent;
 extern ulong aborted_threads,aborted_connects;
 extern ulong delayed_insert_timeout;
 extern ulong delayed_insert_limit, delayed_queue_size;
@@ -857,7 +857,7 @@ extern FILE *bootstrap_file;
 extern pthread_key(MEM_ROOT*,THR_MALLOC);
 extern pthread_mutex_t LOCK_mysql_create_db,LOCK_Acl,LOCK_open,
        LOCK_thread_count,LOCK_mapped_file,LOCK_user_locks, LOCK_status,
-       LOCK_error_log, LOCK_delayed_insert,
+       LOCK_error_log, LOCK_delayed_insert, LOCK_uuid_generator,
        LOCK_delayed_status, LOCK_delayed_create, LOCK_crypt, LOCK_timezone,
        LOCK_slave_list, LOCK_active_mi, LOCK_manager,
        LOCK_global_system_variables, LOCK_user_conn;
@@ -1085,6 +1085,14 @@ inline const char *table_case_name(HA_CREATE_INFO *info, const char *name)
   return ((lower_case_table_names == 2 && info->alias) ? info->alias : name);
 }
 
+inline ulong sql_rnd_with_mutex()
+{
+  pthread_mutex_lock(&LOCK_thread_count);
+  ulong tmp=(ulong) (my_rnd(&sql_rand) * 0xffffffff); /* make all bits random */
+  pthread_mutex_unlock(&LOCK_thread_count);
+  return tmp;
+}
+
 Comp_creator *comp_eq_creator(bool invert);
 Comp_creator *comp_ge_creator(bool invert);
 Comp_creator *comp_gt_creator(bool invert);

sql/mysqld.cc

@@ -369,7 +369,7 @@ pthread_key(MEM_ROOT*,THR_MALLOC);
 pthread_key(THD*, THR_THD);
 pthread_mutex_t LOCK_mysql_create_db, LOCK_Acl, LOCK_open, LOCK_thread_count,
 		LOCK_mapped_file, LOCK_status,
-		LOCK_error_log,
+		LOCK_error_log, LOCK_uuid_generator,
 		LOCK_delayed_insert, LOCK_delayed_status, LOCK_delayed_create,
 		LOCK_crypt, LOCK_bytes_sent, LOCK_bytes_received,
 	        LOCK_global_system_variables,
@@ -2206,6 +2206,7 @@ static int init_thread_environment()
   (void) pthread_mutex_init(&LOCK_user_conn, MY_MUTEX_INIT_FAST);
   (void) pthread_mutex_init(&LOCK_active_mi, MY_MUTEX_INIT_FAST);
   (void) pthread_mutex_init(&LOCK_global_system_variables, MY_MUTEX_INIT_FAST);
+  (void) pthread_mutex_init(&LOCK_uuid_generator, MY_MUTEX_INIT_FAST);
   (void) my_rwlock_init(&LOCK_sys_init_connect, NULL);
   (void) my_rwlock_init(&LOCK_sys_init_slave, NULL);
   (void) my_rwlock_init(&LOCK_grant, NULL);

sql/sql_class.cc

@@ -179,14 +179,8 @@ THD::THD():user_time(0), current_statement(0), is_fatal_error(0),
     transaction.trans_log.end_of_file= max_binlog_cache_size;
   }
 #endif
-  /*
-    We need good random number initialization for new thread
-    Just coping global one will not work
-  */
   {
-    pthread_mutex_lock(&LOCK_thread_count);
-    ulong tmp=(ulong) (my_rnd(&sql_rand) * 0xffffffff); /* make all bits random */
-    pthread_mutex_unlock(&LOCK_thread_count);
+    ulong tmp=sql_rnd_with_mutex();
     randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::query_id);
   }
 }