cdr_adaptive_odbc.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2007, Tilghman Lesher
 *
 * Tilghman Lesher <cdr_adaptive_odbc__v1@the-tilghman.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file
 * \brief Adaptive ODBC CDR backend
 *
 * \author Tilghman Lesher <cdr_adaptive_odbc__v1@the-tilghman.com>
 * \ingroup cdr_drivers
 */

/*** MODULEINFO
   <depend>res_odbc</depend>
   <support_level>core</support_level>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 401579 $")

#include <sys/types.h>
#include <time.h>

#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>

#include "asterisk/config.h"
#include "asterisk/channel.h"
#include "asterisk/lock.h"
#include "asterisk/linkedlists.h"
#include "asterisk/res_odbc.h"
#include "asterisk/cdr.h"
#include "asterisk/module.h"

#define  CONFIG   "cdr_adaptive_odbc.conf"

static const char name[] = "Adaptive ODBC";
/* Optimization to reduce number of memory allocations */
static int maxsize = 512, maxsize2 = 512;

struct columns {
   char *name;
   char *cdrname;
   char *filtervalue;
   char *staticvalue;
   SQLSMALLINT type;
   SQLINTEGER size;
   SQLSMALLINT decimals;
   SQLSMALLINT radix;
   SQLSMALLINT nullable;
   SQLINTEGER octetlen;
   AST_LIST_ENTRY(columns) list;
   unsigned int negatefiltervalue:1;
};

struct tables {
   char *connection;
   char *table;
   char *schema;
   unsigned int usegmtime:1;
   AST_LIST_HEAD_NOLOCK(odbc_columns, columns) columns;
   AST_RWLIST_ENTRY(tables) list;
};

static AST_RWLIST_HEAD_STATIC(odbc_tables, tables);

static int load_config(void)
{
   struct ast_config *cfg;
   struct ast_variable *var;
   const char *tmp, *catg;
   struct tables *tableptr;
   struct columns *entry;
   struct odbc_obj *obj;
   char columnname[80];
   char connection[40];
   char table[40];
   char schema[40];
   int lenconnection, lentable, lenschema, usegmtime = 0;
   SQLLEN sqlptr;
   int res = 0;
   SQLHSTMT stmt = NULL;
   struct ast_flags config_flags = { 0 }; /* Part of our config comes from the database */

   cfg = ast_config_load(CONFIG, config_flags);
   if (!cfg || cfg == CONFIG_STATUS_FILEINVALID) {
      ast_log(LOG_WARNING, "Unable to load " CONFIG ".  No adaptive ODBC CDRs.\n");
      return -1;
   }

   for (catg = ast_category_browse(cfg, NULL); catg; catg = ast_category_browse(cfg, catg)) {
      var = ast_variable_browse(cfg, catg);
      if (!var)
         continue;

      if (ast_strlen_zero(tmp = ast_variable_retrieve(cfg, catg, "connection"))) {
         ast_log(LOG_WARNING, "No connection parameter found in '%s'.  Skipping.\n", catg);
         continue;
      }
      ast_copy_string(connection, tmp, sizeof(connection));
      lenconnection = strlen(connection);

      if (!ast_strlen_zero(tmp = ast_variable_retrieve(cfg, catg, "usegmtime"))) {
         usegmtime = ast_true(tmp);
      }

      /* When loading, we want to be sure we can connect. */
      obj = ast_odbc_request_obj(connection, 1);
      if (!obj) {
         ast_log(LOG_WARNING, "No such connection '%s' in the '%s' section of " CONFIG ".  Check res_odbc.conf.\n", connection, catg);
         continue;
      }

      if (ast_strlen_zero(tmp = ast_variable_retrieve(cfg, catg, "table"))) {
         ast_log(LOG_NOTICE, "No table name found.  Assuming 'cdr'.\n");
         tmp = "cdr";
      }
      ast_copy_string(table, tmp, sizeof(table));
      lentable = strlen(table);

      if (ast_strlen_zero(tmp = ast_variable_retrieve(cfg, catg, "schema"))) {
         tmp = "";
      }
      ast_copy_string(schema, tmp, sizeof(schema));
      lenschema = strlen(schema);

      res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt);
      if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
         ast_log(LOG_WARNING, "SQL Alloc Handle failed on connection '%s'!\n", connection);
         ast_odbc_release_obj(obj);
         continue;
      }

      res = SQLColumns(stmt, NULL, 0, lenschema == 0 ? NULL : (unsigned char *)schema, SQL_NTS, (unsigned char *)table, SQL_NTS, (unsigned char *)"%", SQL_NTS);
      if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
         ast_log(LOG_ERROR, "Unable to query database columns on connection '%s'.  Skipping.\n", connection);
         SQLFreeHandle(SQL_HANDLE_STMT, stmt);
         ast_odbc_release_obj(obj);
         continue;
      }

      tableptr = ast_calloc(sizeof(char), sizeof(*tableptr) + lenconnection + 1 + lentable + 1 + lenschema + 1);
      if (!tableptr) {
         ast_log(LOG_ERROR, "Out of memory creating entry for table '%s' on connection '%s'%s%s%s\n", table, connection,
            lenschema ? " (schema '" : "", lenschema ? schema : "", lenschema ? "')" : "");
         SQLFreeHandle(SQL_HANDLE_STMT, stmt);
         ast_odbc_release_obj(obj);
         res = -1;
         break;
      }

      tableptr->usegmtime = usegmtime;
      tableptr->connection = (char *)tableptr + sizeof(*tableptr);
      tableptr->table = (char *)tableptr + sizeof(*tableptr) + lenconnection + 1;
      tableptr->schema = (char *)tableptr + sizeof(*tableptr) + lenconnection + 1 + lentable + 1;
      ast_copy_string(tableptr->connection, connection, lenconnection + 1);
      ast_copy_string(tableptr->table, table, lentable + 1);
      ast_copy_string(tableptr->schema, schema, lenschema + 1);

      ast_verb(3, "Found adaptive CDR table %s@%s.\n", tableptr->table, tableptr->connection);

      /* Check for filters first */
      for (var = ast_variable_browse(cfg, catg); var; var = var->next) {
         if (strncmp(var->name, "filter", 6) == 0) {
            int negate = 0;
            char *cdrvar = ast_strdupa(var->name + 6);
            cdrvar = ast_strip(cdrvar);
            if (cdrvar[strlen(cdrvar) - 1] == '!') {
               negate = 1;
               cdrvar[strlen(cdrvar) - 1] = '\0';
               ast_trim_blanks(cdrvar);
            }

            ast_verb(3, "Found filter %s'%s' for cdr variable %s in %s@%s\n", negate ? "!" : "", var->value, cdrvar, tableptr->table, tableptr->connection);

            entry = ast_calloc(sizeof(char), sizeof(*entry) + strlen(cdrvar) + 1 + strlen(var->value) + 1);
            if (!entry) {
               ast_log(LOG_ERROR, "Out of memory creating filter entry for CDR variable '%s' in table '%s' on connection '%s'\n", cdrvar, table, connection);
               res = -1;
               break;
            }

            /* NULL column entry means this isn't a column in the database */
            entry->name = NULL;
            entry->cdrname = (char *)entry + sizeof(*entry);
            entry->filtervalue = (char *)entry + sizeof(*entry) + strlen(cdrvar) + 1;
            strcpy(entry->cdrname, cdrvar);
            strcpy(entry->filtervalue, var->value);
            entry->negatefiltervalue = negate;

            AST_LIST_INSERT_TAIL(&(tableptr->columns), entry, list);
         }
      }

      while ((res = SQLFetch(stmt)) != SQL_NO_DATA && res != SQL_ERROR) {
         char *cdrvar = "", *staticvalue = "";

         SQLGetData(stmt,  4, SQL_C_CHAR, columnname, sizeof(columnname), &sqlptr);

         /* Is there an alias for this column? */

         /* NOTE: This seems like a non-optimal parse method, but I'm going
          * for user configuration readability, rather than fast parsing. We
          * really don't parse this file all that often, anyway.
          */
         for (var = ast_variable_browse(cfg, catg); var; var = var->next) {
            if (strncmp(var->name, "alias", 5) == 0 && strcasecmp(var->value, columnname) == 0) {
               char *alias = ast_strdupa(var->name + 5);
               cdrvar = ast_strip(alias);
               ast_verb(3, "Found alias %s for column %s in %s@%s\n", cdrvar, columnname, tableptr->table, tableptr->connection);
               break;
            } else if (strncmp(var->name, "static", 6) == 0 && strcasecmp(var->value, columnname) == 0) {
               char *item = ast_strdupa(var->name + 6);
               item = ast_strip(item);
               if (item[0] == '"' && item[strlen(item) - 1] == '"') {
                  /* Remove surrounding quotes */
                  item[strlen(item) - 1] = '\0';
                  item++;
               }
               staticvalue = item;
            }
         }

         entry = ast_calloc(sizeof(char), sizeof(*entry) + strlen(columnname) + 1 + strlen(cdrvar) + 1 + strlen(staticvalue) + 1);
         if (!entry) {
            ast_log(LOG_ERROR, "Out of memory creating entry for column '%s' in table '%s' on connection '%s'\n", columnname, table, connection);
            res = -1;
            SQLFreeHandle(SQL_HANDLE_STMT, stmt);
            break;
         }
         entry->name = (char *)entry + sizeof(*entry);
         strcpy(entry->name, columnname);

         if (!ast_strlen_zero(cdrvar)) {
            entry->cdrname = entry->name + strlen(columnname) + 1;
            strcpy(entry->cdrname, cdrvar);
         } else { /* Point to same place as the column name */
            entry->cdrname = (char *)entry + sizeof(*entry);
         }

         if (!ast_strlen_zero(staticvalue)) {
            entry->staticvalue = entry->cdrname + strlen(entry->cdrname) + 1;
            strcpy(entry->staticvalue, staticvalue);
         }

         SQLGetData(stmt,  5, SQL_C_SHORT, &entry->type, sizeof(entry->type), NULL);
         SQLGetData(stmt,  7, SQL_C_LONG, &entry->size, sizeof(entry->size), NULL);
         SQLGetData(stmt,  9, SQL_C_SHORT, &entry->decimals, sizeof(entry->decimals), NULL);
         SQLGetData(stmt, 10, SQL_C_SHORT, &entry->radix, sizeof(entry->radix), NULL);
         SQLGetData(stmt, 11, SQL_C_SHORT, &entry->nullable, sizeof(entry->nullable), NULL);
         SQLGetData(stmt, 16, SQL_C_LONG, &entry->octetlen, sizeof(entry->octetlen), NULL);

         /* Specification states that the octenlen should be the maximum number of bytes
          * returned in a char or binary column, but it seems that some drivers just set
          * it to NULL. (Bad Postgres! No biscuit!) */
         if (entry->octetlen == 0)
            entry->octetlen = entry->size;

         ast_verb(10, "Found %s column with type %hd with len %ld, octetlen %ld, and numlen (%hd,%hd)\n", entry->name, entry->type, (long) entry->size, (long) entry->octetlen, entry->decimals, entry->radix);
         /* Insert column info into column list */
         AST_LIST_INSERT_TAIL(&(tableptr->columns), entry, list);
         res = 0;
      }

      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);

      if (AST_LIST_FIRST(&(tableptr->columns)))
         AST_RWLIST_INSERT_TAIL(&odbc_tables, tableptr, list);
      else
         ast_free(tableptr);
   }
   ast_config_destroy(cfg);
   return res;
}

static int free_config(void)
{
   struct tables *table;
   struct columns *entry;
   while ((table = AST_RWLIST_REMOVE_HEAD(&odbc_tables, list))) {
      while ((entry = AST_LIST_REMOVE_HEAD(&(table->columns), list))) {
         ast_free(entry);
      }
      ast_free(table);
   }
   return 0;
}

static SQLHSTMT generic_prepare(struct odbc_obj *obj, void *data)
{
   int res, i;
   SQLHSTMT stmt;
   SQLINTEGER nativeerror = 0, numfields = 0;
   SQLSMALLINT diagbytes = 0;
   unsigned char state[10], diagnostic[256];

   res = SQLAllocHandle (SQL_HANDLE_STMT, obj->con, &stmt);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Alloc Handle failed!\n");
      return NULL;
   }

   res = SQLPrepare(stmt, (unsigned char *) data, SQL_NTS);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Prepare failed![%s]\n", (char *) data);
      SQLGetDiagField(SQL_HANDLE_STMT, stmt, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
      for (i = 0; i < numfields; i++) {
         SQLGetDiagRec(SQL_HANDLE_STMT, stmt, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
         ast_log(LOG_WARNING, "SQL Execute returned an error %d: %s: %s (%d)\n", res, state, diagnostic, diagbytes);
         if (i > 10) {
            ast_log(LOG_WARNING, "Oh, that was good.  There are really %d diagnostics?\n", (int)numfields);
            break;
         }
      }
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      return NULL;
   }

   return stmt;
}

#define LENGTHEN_BUF1(size)                                          \
         do {                                               \
            /* Lengthen buffer, if necessary */                      \
            if (ast_str_strlen(sql) + size + 1 > ast_str_size(sql)) {      \
               if (ast_str_make_space(&sql, ((ast_str_size(sql) + size + 1) / 512 + 1) * 512) != 0) { \
                  ast_log(LOG_ERROR, "Unable to allocate sufficient memory.  Insert CDR '%s:%s' failed.\n", tableptr->connection, tableptr->table); \
                  ast_free(sql);                               \
                  ast_free(sql2);                                 \
                  AST_RWLIST_UNLOCK(&odbc_tables);                \
                  return -1;                                   \
               }                                            \
            }                                               \
         } while (0)

#define LENGTHEN_BUF2(size)                                          \
         do {                                               \
            if (ast_str_strlen(sql2) + size + 1 > ast_str_size(sql2)) {    \
               if (ast_str_make_space(&sql2, ((ast_str_size(sql2) + size + 3) / 512 + 1) * 512) != 0) { \
                  ast_log(LOG_ERROR, "Unable to allocate sufficient memory.  Insert CDR '%s:%s' failed.\n", tableptr->connection, tableptr->table); \
                  ast_free(sql);                               \
                  ast_free(sql2);                                 \
                  AST_RWLIST_UNLOCK(&odbc_tables);                \
                  return -1;                                   \
               }                                            \
            }                                               \
         } while (0)

static int odbc_log(struct ast_cdr *cdr)
{
   struct tables *tableptr;
   struct columns *entry;
   struct odbc_obj *obj;
   struct ast_str *sql = ast_str_create(maxsize), *sql2 = ast_str_create(maxsize2);
   char *tmp;
   char colbuf[1024], *colptr;
   SQLHSTMT stmt = NULL;
   SQLLEN rows = 0;

   if (!sql || !sql2) {
      if (sql)
         ast_free(sql);
      if (sql2)
         ast_free(sql2);
      return -1;
   }

   if (AST_RWLIST_RDLOCK(&odbc_tables)) {
      ast_log(LOG_ERROR, "Unable to lock table list.  Insert CDR(s) failed.\n");
      ast_free(sql);
      ast_free(sql2);
      return -1;
   }

   AST_LIST_TRAVERSE(&odbc_tables, tableptr, list) {
      int first = 1;
      if (ast_strlen_zero(tableptr->schema)) {
         ast_str_set(&sql, 0, "INSERT INTO %s (", tableptr->table);
      } else {
         ast_str_set(&sql, 0, "INSERT INTO %s.%s (", tableptr->schema, tableptr->table);
      }
      ast_str_set(&sql2, 0, " VALUES (");

      /* No need to check the connection now; we'll handle any failure in prepare_and_execute */
      if (!(obj = ast_odbc_request_obj(tableptr->connection, 0))) {
         ast_log(LOG_WARNING, "cdr_adaptive_odbc: Unable to retrieve database handle for '%s:%s'.  CDR failed: %s\n", tableptr->connection, tableptr->table, ast_str_buffer(sql));
         continue;
      }

      AST_LIST_TRAVERSE(&(tableptr->columns), entry, list) {
         int datefield = 0;
         if (strcasecmp(entry->cdrname, "start") == 0) {
            datefield = 1;
         } else if (strcasecmp(entry->cdrname, "answer") == 0) {
            datefield = 2;
         } else if (strcasecmp(entry->cdrname, "end") == 0) {
            datefield = 3;
         }

         /* Check if we have a similarly named variable */
         if (entry->staticvalue) {
            colptr = ast_strdupa(entry->staticvalue);
         } else if (datefield && tableptr->usegmtime) {
            struct timeval date_tv = (datefield == 1) ? cdr->start : (datefield == 2) ? cdr->answer : cdr->end;
            struct ast_tm tm = { 0, };
            ast_localtime(&date_tv, &tm, "UTC");
            ast_strftime(colbuf, sizeof(colbuf), "%Y-%m-%d %H:%M:%S", &tm);
            colptr = colbuf;
         } else {
            ast_cdr_getvar(cdr, entry->cdrname, &colptr, colbuf, sizeof(colbuf), 0, datefield ? 0 : 1);
         }

         if (colptr) {
            /* Check first if the column filters this entry.  Note that this
             * is very specifically NOT ast_strlen_zero(), because the filter
             * could legitimately specify that the field is blank, which is
             * different from the field being unspecified (NULL). */
            if ((entry->filtervalue && !entry->negatefiltervalue && strcasecmp(colptr, entry->filtervalue) != 0) ||
               (entry->filtervalue && entry->negatefiltervalue && strcasecmp(colptr, entry->filtervalue) == 0)) {
               ast_verb(4, "CDR column '%s' with value '%s' does not match filter of"
                  " %s'%s'.  Cancelling this CDR.\n",
                  entry->cdrname, colptr, entry->negatefiltervalue ? "!" : "", entry->filtervalue);
               goto early_release;
            }

            /* Only a filter? */
            if (ast_strlen_zero(entry->name))
               continue;

            LENGTHEN_BUF1(strlen(entry->name));

            switch (entry->type) {
            case SQL_CHAR:
            case SQL_VARCHAR:
            case SQL_LONGVARCHAR:
#ifdef HAVE_ODBC_WCHAR
            case SQL_WCHAR:
            case SQL_WVARCHAR:
            case SQL_WLONGVARCHAR:
#endif
            case SQL_BINARY:
            case SQL_VARBINARY:
            case SQL_LONGVARBINARY:
            case SQL_GUID:
               /* For these two field names, get the rendered form, instead of the raw
                * form (but only when we're dealing with a character-based field).
                */
               if (strcasecmp(entry->name, "disposition") == 0) {
                  ast_cdr_getvar(cdr, entry->name, &colptr, colbuf, sizeof(colbuf), 0, 0);
               } else if (strcasecmp(entry->name, "amaflags") == 0) {
                  ast_cdr_getvar(cdr, entry->name, &colptr, colbuf, sizeof(colbuf), 0, 0);
               }

               /* Truncate too-long fields */
               if (entry->type != SQL_GUID) {
                  if (strlen(colptr) > entry->octetlen) {
                     colptr[entry->octetlen] = '\0';
                  }
               }

               ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
               LENGTHEN_BUF2(strlen(colptr));

               /* Encode value, with escaping */
               ast_str_append(&sql2, 0, "%s'", first ? "" : ",");
               for (tmp = colptr; *tmp; tmp++) {
                  if (*tmp == '\'') {
                     ast_str_append(&sql2, 0, "''");
                  } else if (*tmp == '\\' && ast_odbc_backslash_is_escape(obj)) {
                     ast_str_append(&sql2, 0, "\\\\");
                  } else {
                     ast_str_append(&sql2, 0, "%c", *tmp);
                  }
               }
               ast_str_append(&sql2, 0, "'");
               break;
            case SQL_TYPE_DATE:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  int year = 0, month = 0, day = 0;
                  if (sscanf(colptr, "%4d-%2d-%2d", &year, &month, &day) != 3 || year <= 0 ||
                     month <= 0 || month > 12 || day < 0 || day > 31 ||
                     ((month == 4 || month == 6 || month == 9 || month == 11) && day == 31) ||
                     (month == 2 && year % 400 == 0 && day > 29) ||
                     (month == 2 && year % 100 == 0 && day > 28) ||
                     (month == 2 && year % 4 == 0 && day > 29) ||
                     (month == 2 && year % 4 != 0 && day > 28)) {
                     ast_log(LOG_WARNING, "CDR variable %s is not a valid date ('%s').\n", entry->name, colptr);
                     continue;
                  }

                  if (year > 0 && year < 100) {
                     year += 2000;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(17);
                  ast_str_append(&sql2, 0, "%s{ d '%04d-%02d-%02d' }", first ? "" : ",", year, month, day);
               }
               break;
            case SQL_TYPE_TIME:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  int hour = 0, minute = 0, second = 0;
                  int count = sscanf(colptr, "%2d:%2d:%2d", &hour, &minute, &second);

                  if ((count != 2 && count != 3) || hour < 0 || hour > 23 || minute < 0 || minute > 59 || second < 0 || second > 59) {
                     ast_log(LOG_WARNING, "CDR variable %s is not a valid time ('%s').\n", entry->name, colptr);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(15);
                  ast_str_append(&sql2, 0, "%s{ t '%02d:%02d:%02d' }", first ? "" : ",", hour, minute, second);
               }
               break;
            case SQL_TYPE_TIMESTAMP:
            case SQL_TIMESTAMP:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  int year = 0, month = 0, day = 0, hour = 0, minute = 0, second = 0;
                  int count = sscanf(colptr, "%4d-%2d-%2d %2d:%2d:%2d", &year, &month, &day, &hour, &minute, &second);

                  if ((count != 3 && count != 5 && count != 6) || year <= 0 ||
                     month <= 0 || month > 12 || day < 0 || day > 31 ||
                     ((month == 4 || month == 6 || month == 9 || month == 11) && day == 31) ||
                     (month == 2 && year % 400 == 0 && day > 29) ||
                     (month == 2 && year % 100 == 0 && day > 28) ||
                     (month == 2 && year % 4 == 0 && day > 29) ||
                     (month == 2 && year % 4 != 0 && day > 28) ||
                     hour > 23 || minute > 59 || second > 59 || hour < 0 || minute < 0 || second < 0) {
                     ast_log(LOG_WARNING, "CDR variable %s is not a valid timestamp ('%s').\n", entry->name, colptr);
                     continue;
                  }

                  if (year > 0 && year < 100) {
                     year += 2000;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(26);
                  ast_str_append(&sql2, 0, "%s{ ts '%04d-%02d-%02d %02d:%02d:%02d' }", first ? "" : ",", year, month, day, hour, minute, second);
               }
               break;
            case SQL_INTEGER:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  int integer = 0;
                  if (sscanf(colptr, "%30d", &integer) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an integer.\n", entry->name);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(12);
                  ast_str_append(&sql2, 0, "%s%d", first ? "" : ",", integer);
               }
               break;
            case SQL_BIGINT:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  long long integer = 0;
                  if (sscanf(colptr, "%30lld", &integer) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an integer.\n", entry->name);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(24);
                  ast_str_append(&sql2, 0, "%s%lld", first ? "" : ",", integer);
               }
               break;
            case SQL_SMALLINT:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  short integer = 0;
                  if (sscanf(colptr, "%30hd", &integer) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an integer.\n", entry->name);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(6);
                  ast_str_append(&sql2, 0, "%s%d", first ? "" : ",", integer);
               }
               break;
            case SQL_TINYINT:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  char integer = 0;
                  if (sscanf(colptr, "%30hhd", &integer) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an integer.\n", entry->name);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(4);
                  ast_str_append(&sql2, 0, "%s%d", first ? "" : ",", integer);
               }
               break;
            case SQL_BIT:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  char integer = 0;
                  if (sscanf(colptr, "%30hhd", &integer) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an integer.\n", entry->name);
                     continue;
                  }
                  if (integer != 0)
                     integer = 1;

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(2);
                  ast_str_append(&sql2, 0, "%s%d", first ? "" : ",", integer);
               }
               break;
            case SQL_NUMERIC:
            case SQL_DECIMAL:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  double number = 0.0;

                  if (!strcasecmp(entry->cdrname, "billsec")) {
                     if (!ast_tvzero(cdr->answer)) {
                        snprintf(colbuf, sizeof(colbuf), "%lf",
                                 (double) (ast_tvdiff_us(cdr->end, cdr->answer) / 1000000.0));
                     } else {
                        ast_copy_string(colbuf, "0", sizeof(colbuf));
                     }
                  } else if (!strcasecmp(entry->cdrname, "duration")) {
                     snprintf(colbuf, sizeof(colbuf), "%lf",
                              (double) (ast_tvdiff_us(cdr->end, cdr->start) / 1000000.0));

                     if (!ast_strlen_zero(colbuf)) {
                        colptr = colbuf;
                     }
                  }

                  if (sscanf(colptr, "%30lf", &number) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an numeric type.\n", entry->name);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(entry->decimals);
                  ast_str_append(&sql2, 0, "%s%*.*lf", first ? "" : ",", entry->decimals, entry->radix, number);
               }
               break;
            case SQL_FLOAT:
            case SQL_REAL:
            case SQL_DOUBLE:
               if (ast_strlen_zero(colptr)) {
                  continue;
               } else {
                  double number = 0.0;

                  if (!strcasecmp(entry->cdrname, "billsec")) {
                     if (!ast_tvzero(cdr->answer)) {
                        snprintf(colbuf, sizeof(colbuf), "%lf",
                                 (double) (ast_tvdiff_us(cdr->end, cdr->answer) / 1000000.0));
                     } else {
                        ast_copy_string(colbuf, "0", sizeof(colbuf));
                     }
                  } else if (!strcasecmp(entry->cdrname, "duration")) {
                     snprintf(colbuf, sizeof(colbuf), "%lf",
                              (double) (ast_tvdiff_us(cdr->end, cdr->start) / 1000000.0));

                     if (!ast_strlen_zero(colbuf)) {
                        colptr = colbuf;
                     }
                  }

                  if (sscanf(colptr, "%30lf", &number) != 1) {
                     ast_log(LOG_WARNING, "CDR variable %s is not an numeric type.\n", entry->name);
                     continue;
                  }

                  ast_str_append(&sql, 0, "%s%s", first ? "" : ",", entry->name);
                  LENGTHEN_BUF2(entry->decimals);
                  ast_str_append(&sql2, 0, "%s%lf", first ? "" : ",", number);
               }
               break;
            default:
               ast_log(LOG_WARNING, "Column type %d (field '%s:%s:%s') is unsupported at this time.\n", entry->type, tableptr->connection, tableptr->table, entry->name);
               continue;
            }
            first = 0;
         } else if (entry->filtervalue
            && ((!entry->negatefiltervalue && entry->filtervalue[0] != '\0')
               || (entry->negatefiltervalue && entry->filtervalue[0] == '\0'))) {
            ast_verb(4, "CDR column '%s' was not set and does not match filter of"
               " %s'%s'.  Cancelling this CDR.\n",
               entry->cdrname, entry->negatefiltervalue ? "!" : "",
               entry->filtervalue);
            goto early_release;
         }
      }

      /* Concatenate the two constructed buffers */
      LENGTHEN_BUF1(ast_str_strlen(sql2));
      ast_str_append(&sql, 0, ")");
      ast_str_append(&sql2, 0, ")");
      ast_str_append(&sql, 0, "%s", ast_str_buffer(sql2));

      ast_verb(11, "[%s]\n", ast_str_buffer(sql));

      stmt = ast_odbc_prepare_and_execute(obj, generic_prepare, ast_str_buffer(sql));
      if (stmt) {
         SQLRowCount(stmt, &rows);
         SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      }
      if (rows == 0) {
         ast_log(LOG_WARNING, "cdr_adaptive_odbc: Insert failed on '%s:%s'.  CDR failed: %s\n", tableptr->connection, tableptr->table, ast_str_buffer(sql));
      }
early_release:
      ast_odbc_release_obj(obj);
   }
   AST_RWLIST_UNLOCK(&odbc_tables);

   /* Next time, just allocate buffers that are that big to start with. */
   if (ast_str_strlen(sql) > maxsize) {
      maxsize = ast_str_strlen(sql);
   }
   if (ast_str_strlen(sql2) > maxsize2) {
      maxsize2 = ast_str_strlen(sql2);
   }

   ast_free(sql);
   ast_free(sql2);
   return 0;
}

static int unload_module(void)
{
   ast_cdr_unregister(name);
   if (AST_RWLIST_WRLOCK(&odbc_tables)) {
      ast_cdr_register(name, ast_module_info->description, odbc_log);
      ast_log(LOG_ERROR, "Unable to lock column list.  Unload failed.\n");
      return -1;
   }

   free_config();
   AST_RWLIST_UNLOCK(&odbc_tables);
   return 0;
}

static int load_module(void)
{
   if (AST_RWLIST_WRLOCK(&odbc_tables)) {
      ast_log(LOG_ERROR, "Unable to lock column list.  Load failed.\n");
      return 0;
   }

   load_config();
   AST_RWLIST_UNLOCK(&odbc_tables);
   ast_cdr_register(name, ast_module_info->description, odbc_log);
   return 0;
}

static int reload(void)
{
   if (AST_RWLIST_WRLOCK(&odbc_tables)) {
      ast_log(LOG_ERROR, "Unable to lock column list.  Reload failed.\n");
      return -1;
   }

   free_config();
   load_config();
   AST_RWLIST_UNLOCK(&odbc_tables);
   return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Adaptive ODBC CDR backend",
   .load = load_module,
   .unload = unload_module,
   .reload = reload,
   .load_pri = AST_MODPRI_CDR_DRIVER,
);