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Last updated: Sat Feb 3 05:00:53 2007

Asterisk developer's documentation :: Codename Pineapple

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res_config_odbc.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * Copyright (C) 2004 - 2005 Anthony Minessale II <anthmct@yahoo.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 odbc+odbc plugin for portable configuration engine
 *
 * \author Mark Spencer <markster@digium.com>
 * \author Anthony Minessale II <anthmct@yahoo.com>
 *
 * \arg http://www.unixodbc.org
 */

/*** MODULEINFO
   <depend>unixodbc</depend>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 49808 $")

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/lock.h"
#include "asterisk/options.h"
#include "asterisk/res_odbc.h"
#include "asterisk/utils.h"

static struct ast_variable *realtime_odbc(const char *database, const char *table, va_list ap)
{
   struct odbc_obj *obj;
   SQLHSTMT stmt;
   char sql[1024];
   char coltitle[256];
   char rowdata[2048];
   char *op;
   const char *newparam, *newval;
   char *stringp;
   char *chunk;
   SQLSMALLINT collen;
   int res;
   int x;
   struct ast_variable *var=NULL, *prev=NULL;
   SQLULEN colsize;
   SQLSMALLINT colcount=0;
   SQLSMALLINT datatype;
   SQLSMALLINT decimaldigits;
   SQLSMALLINT nullable;
   SQLLEN indicator;
   va_list aq;
   
   va_copy(aq, ap);
   
   
   if (!table)
      return NULL;

   obj = ast_odbc_request_obj(database, 0);
   if (!obj)
      return NULL;

   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");
      ast_odbc_release_obj(obj);
      return NULL;
   }

   newparam = va_arg(aq, const char *);
   if (!newparam)  {
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }
   newval = va_arg(aq, const char *);
   if (!strchr(newparam, ' ')) op = " ="; else op = "";
   snprintf(sql, sizeof(sql), "SELECT * FROM %s WHERE %s%s ?", table, newparam, op);
   while((newparam = va_arg(aq, const char *))) {
      if (!strchr(newparam, ' ')) op = " ="; else op = "";
      snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " AND %s%s ?", newparam, op);
      newval = va_arg(aq, const char *);
   }
   va_end(aq);
   res = SQLPrepare(stmt, (unsigned char *)sql, SQL_NTS);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Prepare failed![%s]\n", sql);
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }
   
   /* Now bind the parameters */
   x = 1;

   while((newparam = va_arg(ap, const char *))) {
      newval = va_arg(ap, const char *);
      SQLBindParameter(stmt, x++, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, strlen(newval), 0, (void *)newval, 0, NULL);
   }
   
   res = ast_odbc_smart_execute(obj, stmt);

   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Execute error!\n[%s]\n\n", sql);
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   res = SQLNumResultCols(stmt, &colcount);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Column Count error!\n[%s]\n\n", sql);
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   res = SQLFetch(stmt);
   if (res == SQL_NO_DATA) {
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
                return NULL;
   }
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Fetch error!\n[%s]\n\n", sql);
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }
   for (x = 0; x < colcount; x++) {
      rowdata[0] = '\0';
      collen = sizeof(coltitle);
      res = SQLDescribeCol(stmt, x + 1, (unsigned char *)coltitle, sizeof(coltitle), &collen, 
               &datatype, &colsize, &decimaldigits, &nullable);
      if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
         ast_log(LOG_WARNING, "SQL Describe Column error!\n[%s]\n\n", sql);
         if (var)
            ast_variables_destroy(var);
         ast_odbc_release_obj(obj);
         return NULL;
      }

      indicator = 0;
      res = SQLGetData(stmt, x + 1, SQL_CHAR, rowdata, sizeof(rowdata), &indicator);
      if (indicator == SQL_NULL_DATA)
         rowdata[0] = '\0';
      else if (ast_strlen_zero(rowdata)) {
         /* Because we encode the empty string for a NULL, we will encode
          * actual empty strings as a string containing a single whitespace. */
         ast_copy_string(rowdata, " ", sizeof(rowdata));
      }

      if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
         ast_log(LOG_WARNING, "SQL Get Data error!\n[%s]\n\n", sql);
         if (var)
            ast_variables_destroy(var);
         ast_odbc_release_obj(obj);
         return NULL;
      }
      stringp = rowdata;
      while(stringp) {
         chunk = strsep(&stringp, ";");
         if (prev) {
            prev->next = ast_variable_new(coltitle, chunk);
            if (prev->next)
               prev = prev->next;
         } else 
            prev = var = ast_variable_new(coltitle, chunk);
      }
   }


   SQLFreeHandle (SQL_HANDLE_STMT, stmt);
   ast_odbc_release_obj(obj);
   return var;
}

static struct ast_config *realtime_multi_odbc(const char *database, const char *table, va_list ap)
{
   struct odbc_obj *obj;
   SQLHSTMT stmt;
   char sql[1024];
   char coltitle[256];
   char rowdata[2048];
   const char *initfield=NULL;
   char *op;
   const char *newparam, *newval;
   char *stringp;
   char *chunk;
   SQLSMALLINT collen;
   int res;
   int x;
   struct ast_variable *var=NULL;
   struct ast_config *cfg=NULL;
   struct ast_category *cat=NULL;
   struct ast_realloca ra;
   SQLULEN colsize;
   SQLSMALLINT colcount=0;
   SQLSMALLINT datatype;
   SQLSMALLINT decimaldigits;
   SQLSMALLINT nullable;
   SQLLEN indicator;

   va_list aq;
   va_copy(aq, ap);
   
   
   if (!table)
      return NULL;
   memset(&ra, 0, sizeof(ra));

   obj = ast_odbc_request_obj(database, 0);
   if (!obj)
      return NULL;

   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");
      ast_odbc_release_obj(obj);
      return NULL;
   }

   newparam = va_arg(aq, const char *);
   if (!newparam)  {
      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }
   initfield = ast_strdupa(newparam);
   if ((op = strchr(initfield, ' '))) 
      *op = '\0';
   newval = va_arg(aq, const char *);
   if (!strchr(newparam, ' ')) op = " ="; else op = "";
   snprintf(sql, sizeof(sql), "SELECT * FROM %s WHERE %s%s ?", table, newparam, op);
   while((newparam = va_arg(aq, const char *))) {
      if (!strchr(newparam, ' ')) op = " ="; else op = "";
      snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " AND %s%s ?", newparam, op);
      newval = va_arg(aq, const char *);
   }
   if (initfield)
      snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " ORDER BY %s", initfield);
   va_end(aq);
   res = SQLPrepare(stmt, (unsigned char *)sql, SQL_NTS);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Prepare failed![%s]\n", sql);
      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }
   
   /* Now bind the parameters */
   x = 1;

   while((newparam = va_arg(ap, const char *))) {
      newval = va_arg(ap, const char *);
      SQLBindParameter(stmt, x++, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, strlen(newval), 0, (void *)newval, 0, NULL);
   }
      
   res = ast_odbc_smart_execute(obj, stmt);

   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Execute error!\n[%s]\n\n", sql);
      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   res = SQLNumResultCols(stmt, &colcount);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Column Count error!\n[%s]\n\n", sql);
      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   cfg = ast_config_new();
   if (!cfg) {
      ast_log(LOG_WARNING, "Out of memory!\n");
      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   while ((res=SQLFetch(stmt)) != SQL_NO_DATA) {
      var = NULL;
      if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
         ast_log(LOG_WARNING, "SQL Fetch error!\n[%s]\n\n", sql);
         continue;
      }
      cat = ast_category_new("");
      if (!cat) {
         ast_log(LOG_WARNING, "Out of memory!\n");
         continue;
      }
      for (x=0;x<colcount;x++) {
         rowdata[0] = '\0';
         collen = sizeof(coltitle);
         res = SQLDescribeCol(stmt, x + 1, (unsigned char *)coltitle, sizeof(coltitle), &collen, 
                  &datatype, &colsize, &decimaldigits, &nullable);
         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
            ast_log(LOG_WARNING, "SQL Describe Column error!\n[%s]\n\n", sql);
            ast_category_destroy(cat);
            continue;
         }

         indicator = 0;
         res = SQLGetData(stmt, x + 1, SQL_CHAR, rowdata, sizeof(rowdata), &indicator);
         if (indicator == SQL_NULL_DATA)
            continue;

         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
            ast_log(LOG_WARNING, "SQL Get Data error!\n[%s]\n\n", sql);
            ast_category_destroy(cat);
            continue;
         }
         stringp = rowdata;
         while(stringp) {
            chunk = strsep(&stringp, ";");
            if (!ast_strlen_zero(ast_strip(chunk))) {
               if (initfield && !strcmp(initfield, coltitle))
                  ast_category_rename(cat, chunk);
               var = ast_variable_new(coltitle, chunk);
               ast_variable_append(cat, var);
            }
         }
      }
      ast_category_append(cfg, cat);
   }

   SQLFreeHandle(SQL_HANDLE_STMT, stmt);
   ast_odbc_release_obj(obj);
   return cfg;
}

static int update_odbc(const char *database, const char *table, const char *keyfield, const char *lookup, va_list ap)
{
   struct odbc_obj *obj;
   SQLHSTMT stmt;
   char sql[256];
   SQLLEN rowcount=0;
   const char *newparam, *newval;
   int res;
   int x;
   va_list aq;
   
   va_copy(aq, ap);
   
   if (!table)
      return -1;

   obj = ast_odbc_request_obj(database, 0);
   if (!obj)
      return -1;

   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");
      ast_odbc_release_obj(obj);
      return -1;
   }

   newparam = va_arg(aq, const char *);
   if (!newparam)  {
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return -1;
   }
   newval = va_arg(aq, const char *);
   snprintf(sql, sizeof(sql), "UPDATE %s SET %s=?", table, newparam);
   while((newparam = va_arg(aq, const char *))) {
      snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), ", %s=?", newparam);
      newval = va_arg(aq, const char *);
   }
   va_end(aq);
   snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), " WHERE %s=?", keyfield);
   
   res = SQLPrepare(stmt, (unsigned char *)sql, SQL_NTS);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Prepare failed![%s]\n", sql);
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return -1;
   }
   
   /* Now bind the parameters */
   x = 1;

   while((newparam = va_arg(ap, const char *))) {
      newval = va_arg(ap, const char *);
      SQLBindParameter(stmt, x++, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, strlen(newval), 0, (void *)newval, 0, NULL);
   }
      
   SQLBindParameter(stmt, x++, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, strlen(lookup), 0, (void *)lookup, 0, NULL);

   res = ast_odbc_smart_execute(obj, stmt);

   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Execute error!\n[%s]\n\n", sql);
      SQLFreeHandle (SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return -1;
   }

   res = SQLRowCount(stmt, &rowcount);
   SQLFreeHandle (SQL_HANDLE_STMT, stmt);
   ast_odbc_release_obj(obj);

   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL Row Count error!\n[%s]\n\n", sql);
      return -1;
   }

   if (rowcount >= 0)
      return (int)rowcount;

   return -1;
}

struct config_odbc_obj {
   char *sql;
   unsigned long id;
   unsigned long cat_metric;
   unsigned long var_metric;
   unsigned long commented;
   char filename[128];
   char category[128];
   char var_name[128];
   char var_val[1024]; /* changed from 128 to 1024 via bug 8251 */
   SQLLEN err;
};

static SQLHSTMT config_odbc_prepare(struct odbc_obj *obj, void *data)
{
   struct config_odbc_obj *q = data;
   SQLHSTMT sth;
   int res;

   res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &sth);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      if (option_verbose > 3)
         ast_verbose( VERBOSE_PREFIX_4 "Failure in AllocStatement %d\n", res);
      return NULL;
   }

   res = SQLPrepare(sth, (unsigned char *)q->sql, SQL_NTS);
   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      if (option_verbose > 3)
         ast_verbose( VERBOSE_PREFIX_4 "Error in PREPARE %d\n", res);
      SQLFreeHandle(SQL_HANDLE_STMT, sth);
      return NULL;
   }

   SQLBindCol(sth, 1, SQL_C_ULONG, &q->id, sizeof(q->id), &q->err);
   SQLBindCol(sth, 2, SQL_C_ULONG, &q->cat_metric, sizeof(q->cat_metric), &q->err);
   SQLBindCol(sth, 3, SQL_C_ULONG, &q->var_metric, sizeof(q->var_metric), &q->err);
   SQLBindCol(sth, 4, SQL_C_ULONG, &q->commented, sizeof(q->commented), &q->err);
   SQLBindCol(sth, 5, SQL_C_CHAR, q->filename, sizeof(q->filename), &q->err);
   SQLBindCol(sth, 6, SQL_C_CHAR, q->category, sizeof(q->category), &q->err);
   SQLBindCol(sth, 7, SQL_C_CHAR, q->var_name, sizeof(q->var_name), &q->err);
   SQLBindCol(sth, 8, SQL_C_CHAR, q->var_val, sizeof(q->var_val), &q->err);

   return sth;
}

static struct ast_config *config_odbc(const char *database, const char *table, const char *file, struct ast_config *cfg, int withcomments)
{
   struct ast_variable *new_v;
   struct ast_category *cur_cat;
   int res = 0;
   struct odbc_obj *obj;
   char sql[255] = "";
   unsigned int last_cat_metric = 0;
   SQLSMALLINT rowcount=0;
   SQLHSTMT stmt;
   char last[128] = "";
   struct config_odbc_obj q;

   memset(&q, 0, sizeof(q));

   if (!file || !strcmp (file, "res_config_odbc.conf"))
      return NULL;      /* cant configure myself with myself ! */

   obj = ast_odbc_request_obj(database, 0);
   if (!obj)
      return NULL;

   snprintf(sql, sizeof(sql), "SELECT * FROM %s WHERE filename='%s' and commented=0 ORDER BY filename,cat_metric desc,var_metric asc,category,var_name,var_val,id", table, file);
   q.sql = sql;

   stmt = ast_odbc_prepare_and_execute(obj, config_odbc_prepare, &q);

   if (!stmt) {
      ast_log(LOG_WARNING, "SQL select error!\n[%s]\n\n", sql);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   res = SQLNumResultCols(stmt, &rowcount);

   if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
      ast_log(LOG_WARNING, "SQL NumResultCols error!\n[%s]\n\n", sql);
      SQLFreeHandle(SQL_HANDLE_STMT, stmt);
      ast_odbc_release_obj(obj);
      return NULL;
   }

   if (!rowcount) {
      ast_log(LOG_NOTICE, "found nothing\n");
      ast_odbc_release_obj(obj);
      return cfg;
   }

   cur_cat = ast_config_get_current_category(cfg);

   while ((res = SQLFetch(stmt)) != SQL_NO_DATA) {
      if (!strcmp (q.var_name, "#include")) {
         if (!ast_config_internal_load(q.var_val, cfg, 0)) {
            SQLFreeHandle(SQL_HANDLE_STMT, stmt);
            ast_odbc_release_obj(obj);
            return NULL;
         }
         continue;
      } 
      if (strcmp(last, q.category) || last_cat_metric != q.cat_metric) {
         cur_cat = ast_category_new(q.category);
         if (!cur_cat) {
            ast_log(LOG_WARNING, "Out of memory!\n");
            break;
         }
         strcpy(last, q.category);
         last_cat_metric   = q.cat_metric;
         ast_category_append(cfg, cur_cat);
      }

      new_v = ast_variable_new(q.var_name, q.var_val);
      ast_variable_append(cur_cat, new_v);
   }

   SQLFreeHandle(SQL_HANDLE_STMT, stmt);
   ast_odbc_release_obj(obj);
   return cfg;
}

static struct ast_config_engine odbc_engine = {
   .name = "odbc",
   .load_func = config_odbc,
   .realtime_func = realtime_odbc,
   .realtime_multi_func = realtime_multi_odbc,
   .update_func = update_odbc
};

static int unload_module (void)
{
   ast_module_user_hangup_all();
   ast_config_engine_deregister(&odbc_engine);
   if (option_verbose)
      ast_verbose("res_config_odbc unloaded.\n");
   return 0;
}

static int load_module (void)
{
   ast_config_engine_register(&odbc_engine);
   if (option_verbose)
      ast_verbose("res_config_odbc loaded.\n");
   return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "ODBC Configuration",
      .load = load_module,
      .unload = unload_module,
      );

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