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
 */
 
/*! \li \ref cdr_adaptive_odbc.c uses the configuration file \ref cdr_adaptive_odbc.conf
 * \addtogroup configuration_file Configuration Files
 */
 
/*!
 * \page cdr_adaptive_odbc.conf cdr_adaptive_odbc.conf
 * \verbinclude cdr_adaptive_odbc.conf.sample
 */
 
/*** MODULEINFO
    <depend>res_odbc</depend>
    <depend>generic_odbc</depend>
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#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;
    char quoted_identifiers;
    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];
    char quoted_identifiers;
    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);
 
        if (ast_strlen_zero(tmp = ast_variable_retrieve(cfg, catg, "quoted_identifiers"))) {
            tmp = "";
        }
        quoted_identifiers = tmp[0];
        if (strlen(tmp) > 1) {
            ast_log(LOG_ERROR, "The quoted_identifiers setting only accepts a single character,"
                " while a value of '%s' was provided. This option has been disabled as a result.\n", tmp);
            quoted_identifiers = '\0';
        }
 
        res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt);
        if (!SQL_SUCCEEDED(res)) {
            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 (!SQL_SUCCEEDED(res)) {
            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 + 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);
        tableptr->quoted_identifiers = quoted_identifiers;
 
        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(4, "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;
}
 
#define LENGTHEN_BUF(size, var_sql)                                                     \
            do {                                                                \
                /* Lengthen buffer, if necessary */                             \
                if (ast_str_strlen(var_sql) + size + 1 > ast_str_size(var_sql)) {       \
                    if (ast_str_make_space(&var_sql, ((ast_str_size(var_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_BUF1(size) \
    LENGTHEN_BUF(size, sql);
#define LENGTHEN_BUF2(size) \
    LENGTHEN_BUF(size, sql2);
 
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;
    char *separator;
    int quoted = 0;
    int res;
 
    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) {
        separator = "";
 
        quoted = 0;
        if (tableptr->quoted_identifiers != '\0'){
            quoted = 1;
        }
 
        if (ast_strlen_zero(tableptr->schema)) {
            if (quoted) {
                ast_str_set(&sql, 0, "INSERT INTO %c%s%c (",
                    tableptr->quoted_identifiers, tableptr->table, tableptr->quoted_identifiers );
            }else{
                ast_str_set(&sql, 0, "INSERT INTO %s (", tableptr->table);
            }
        } else {
            if (quoted) {
                ast_str_set(&sql, 0, "INSERT INTO %c%s%c.%c%s%c (",
                        tableptr->quoted_identifiers, tableptr->schema, tableptr->quoted_identifiers,
                        tableptr->quoted_identifiers, tableptr->table,  tableptr->quoted_identifiers);
            }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_format_var(cdr, entry->cdrname, &colptr, colbuf, sizeof(colbuf), 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_format_var(cdr, entry->name, &colptr, colbuf, sizeof(colbuf), 0);
                    } else if (strcasecmp(entry->name, "amaflags") == 0) {
                        ast_cdr_format_var(cdr, entry->name, &colptr, colbuf, sizeof(colbuf), 0);
                    }
 
                    /* Truncate too-long fields */
                    if (entry->type != SQL_GUID) {
                        if (strlen(colptr) > entry->octetlen) {
                            colptr[entry->octetlen] = '\0';
                        }
                    }
 
                    LENGTHEN_BUF2(strlen(colptr));
 
                    /* Encode value, with escaping */
                    ast_str_append(&sql2, 0, "%s'", separator);
                    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;
                        }
 
                        LENGTHEN_BUF2(17);
                        ast_str_append(&sql2, 0, "%s{ d '%04d-%02d-%02d' }", separator, 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;
                        }
 
                        LENGTHEN_BUF2(15);
                        ast_str_append(&sql2, 0, "%s{ t '%02d:%02d:%02d' }", separator, hour, minute, second);
                    }
                    break;
                case SQL_TYPE_TIMESTAMP:
                case SQL_TIMESTAMP:
                case SQL_DATETIME:
                    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;
                        }
 
                        LENGTHEN_BUF2(26);
                        ast_str_append(&sql2, 0, "%s{ ts '%04d-%02d-%02d %02d:%02d:%02d' }", separator, 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;
                        }
 
                        LENGTHEN_BUF2(12);
                        ast_str_append(&sql2, 0, "%s%d", separator, 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;
                        }
 
                        LENGTHEN_BUF2(24);
                        ast_str_append(&sql2, 0, "%s%lld", separator, 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;
                        }
 
                        LENGTHEN_BUF2(6);
                        ast_str_append(&sql2, 0, "%s%d", separator, integer);
                    }
                    break;
                case SQL_TINYINT:
                    if (ast_strlen_zero(colptr)) {
                        continue;
                    } else {
                        signed char integer = 0;
                        if (sscanf(colptr, "%30hhd", &integer) != 1) {
                            ast_log(LOG_WARNING, "CDR variable %s is not an integer.\n", entry->name);
                            continue;
                        }
 
                        LENGTHEN_BUF2(4);
                        ast_str_append(&sql2, 0, "%s%d", separator, integer);
                    }
                    break;
                case SQL_BIT:
                    if (ast_strlen_zero(colptr)) {
                        continue;
                    } else {
                        signed 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;
 
                        LENGTHEN_BUF2(2);
                        ast_str_append(&sql2, 0, "%s%d", separator, 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;
                        }
 
                        LENGTHEN_BUF2(entry->decimals);
                        ast_str_append(&sql2, 0, "%s%*.*lf", separator, 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;
                        }
 
                        LENGTHEN_BUF2(entry->decimals);
                        ast_str_append(&sql2, 0, "%s%lf", separator, 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;
                }
                if (quoted) {
                    ast_str_append(&sql, 0, "%s%c%s%c", separator, tableptr->quoted_identifiers, entry->name, tableptr->quoted_identifiers);
                } else {
                    ast_str_append(&sql, 0, "%s%s", separator, entry->name);
                }
                separator = ", ";
            } 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_debug(3, "Executing [%s]\n", ast_str_buffer(sql));
 
        /* There is no benefit to prepared statements here as each generated
           INSERT statement is unique. Just execute our query directly. */
        res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt);
        if (!SQL_SUCCEEDED(res)) {
            ast_log(LOG_WARNING, "SQL Alloc Handle failed on connection '%s'!\n",
                tableptr->connection);
            goto early_release;
        }
 
        res = ast_odbc_execute_sql(obj, stmt, ast_str_buffer(sql));
        if (!SQL_SUCCEEDED(res)) {
            ast_log(LOG_WARNING, "cdr_adaptive_odbc: Insert failed on '%s:%s'.  CDR failed: %s\n", tableptr->connection, tableptr->table, ast_str_buffer(sql));
        }
 
        SQLFreeHandle(SQL_HANDLE_STMT, stmt);
 
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)
{
    if (ast_cdr_unregister(name)) {
        return -1;
    }
 
    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",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .reload = reload,
    .load_pri = AST_MODPRI_CDR_DRIVER,
    .requires = "cdr,res_odbc",
);