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1357 lines (1156 loc) · 39.7 KB
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/** Interface routines for ODBC server, nominally MS SQL Server */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include "common.h"
#ifndef DISCARDMICROSOFTSQL
#include "mssql_imp.h"
#include "ms_sql.h"
#include "zif.h"
#undef TRACE_ON // sqlext.h redefines TRACE_ON as 1
#include <sql.h>
#include <sqlext.h>
#ifdef LINUX
#include <syslog.h>
#endif
char mssqlUserFilename[MAX_WORD_SIZE]; // current topic file name for user
char mssqlparams[300]; // global variable storing params
static char mssqlhost[100];
static char mssqlport[100];
static char mssqluser[100];
static char mssqlpasswd[100];
static char mssqldatabase[100];
static const char* log_filename = "mssql_init_log.txt";
static void* z_buffer = nullptr; // for compress and uncomress operations
static int z_buffer_size = 0;
static int z_ref_count = 0;
// library init
static const size_t mssql_header_size = 4;
static bool already_entered_close = false;
// forward references
struct DbInterface_t;
static DbInterface_t* get_db(int id);
static bool is_db_initialized(ConnectionId c_id);
static void set_db_initialized(ConnectionId c_id, bool flag);
static void set_db_used(ConnectionId c_id, bool flag);
static void* init_z_buffer(int size);
static int uninit_z_buffer();
static void set_error_max(char* str);
static const char* get_error_max();
// useful mssql commands (to use from sqlcmd). Always follow with newline, and GO
// SELECT * FROM INFORMATION_SCHEMA.TABLES;
// -- lists all tables defined in db(looking to see if userState is defined yet)
// create database chatscript; -- create the database
// USE chatscript; --make this the current database
// CREATE TABLE userState (userid varchar(100) PRIMARY KEY, ustate VARBINARY(max), lastUpdateDate DATETIME DEFAULT CURRENT_TIMESTAMP)
// select * from information_schema.columns where table_name='userState'; -- lists names of fields and types.
// SELECT * from userState to show entries
// DELETE FROM userState WHERE DATE(lastUpdateDate) < DATE(NOW() - INTERVAL 1 DAY)
// Above deletes records 2 days or earlier. A user might converse just before midnight and then continue shortly thereafter, so we do not merely want a single day separator.
// DROP TABLE userState; --destroy the entire collection of saved entries. Then recreate it.
#ifndef DISCARD_MSSQL_INTERFACE_FOR_TEST
const char* MsSqlVersion()
{
static char version[MAX_WORD_SIZE] = "";
if (*version) return(version);
const char *data = "?";
sprintf(version,"MicrosoftSql %s", data);
return(version);
}
static void loadSingleSqlParam(char* params, char* name, char* destination)
{
char name_with_equals[300];
sprintf(name_with_equals, "%s=", name);
int namelen = strlen(name_with_equals);
char* p = strstr(params, name_with_equals);
if (p) {
ReadCompiledWord(p + namelen, destination);
}
else {
ReportBug("Warning: could not find %s in sql param string %s",
name_with_equals, params);
}
}
static void LoadMsSqlParams(char* params)
{
size_t len = strlen(params);
if (params[len - 1] == '"') params[len - 1] = 0;
loadSingleSqlParam(params, "host", mssqlhost);
loadSingleSqlParam(params, "port", mssqlport);
loadSingleSqlParam(params, "user", mssqluser);
loadSingleSqlParam(params, "password", mssqlpasswd);
loadSingleSqlParam(params, "database", mssqldatabase);
}
static FILE* GetUserFilenameFromName(const char* name)
{
const char* at = strrchr(name, '/');
if (at) strcpy(mssqlUserFilename, at + 1);
else strcpy(mssqlUserFilename,name);
return (FILE*)mssqlUserFilename;
}
// Declaration to prevent forward reference
static void SetUserFileSystemBlock(void);
////////////////////////////////////
// FILE SYSTEM REPLACEMENT FUNCTIONS
////////////////////////////////////
FILE* mssqlUserCreate(const char* name)
{ // unlike file system create, we dont create anything here, just note it
return (FILE*)GetUserFilenameFromName(name);
}
FILE* mssqlUserOpen(const char* name)
{ // unlike file system open, we dont open anything here, just note it
return (FILE*)GetUserFilenameFromName(name);
}
int mssqlUserClose(FILE*)
{ // since we never create or open anything, we dont have to close it
return 0;
}
static size_t mssqlUserRead(void* buf,size_t size, size_t count, FILE* key)
{ // read topic file record of user
set_error_max("WARN"); // failing read operations is not fatal
if (!is_db_initialized(User)) {
ReportBug( "%s: user mssql not initialized yet", get_error_max() );
return 0;
}
size_t z_size = z_buffer_size;
int rv = mssql_file_read(User, z_buffer, &z_size, (const char*) key);
if (rv) {
ReportBug( mssql_error() );
return 0;
}
size_t buf_size = size * count;
int rv_u = mssql_maybe_uncompress((char*)z_buffer,
z_size,
(char*)buf,
&buf_size);
if (rv_u) {
printf( "%s", mssql_error() );
ReportBug( mssql_error() );
return 0;
}
return buf_size;
}
static size_t mssqlUserWrite(const void* buf, size_t size, size_t count, FILE* key)
{
set_error_max("FATAL"); // failing write operations is fatal
if (!is_db_initialized(User)) {
ReportBug( "%s: user mssql not initialized yet", get_error_max() );
return 0;
}
size_t buf_size = size * count;
size_t z_size = z_buffer_size;
int rv_c = mssql_maybe_compress((char*)z_buffer,
&z_size,
(const char*)buf,
buf_size);
if (rv_c) {
ReportBug( mssql_error() );
return 0;
}
int rv_w = mssql_file_write(User, z_buffer, z_size, (const char*) key);
if (rv_w) {
ReportBug( mssql_error() );
return 0;
}
return buf_size;
}
static void save_info_string_to_mssql_syslog(const char* s)
{
#ifdef LINUX
syslog(LOG_INFO, "%s user: %s bot: %s msg %s",
syslogstr, loginID, computerID, s);
#endif
}
// initialize the user system
void MsSqlUserFilesCode(char* params)
{
set_error_max("FATAL");
int conn_id = mssql_init_db_struct(User);
if (conn_id < 0) ReportBug((char*) mssql_error());
LoadMsSqlParams(params);
int rv = mssql_init(User, mssqlhost, mssqlport,
mssqluser, mssqlpasswd, mssqldatabase);
if (rv) {
ReportBug((char*)"%s: mssql: Failed to connect to MSSQL: %s %s",
get_error_max(), params, mssql_error());
return;
}
SetUserFileSystemBlock();
save_info_string_to_mssql_syslog("init mssql");
already_entered_close = false;
}
void MsSqlFullCloseCode()
{
set_error_max("FATAL");
if (already_entered_close) return; // prevent infinite loop because of ReportBug
already_entered_close = true;
if (!is_db_initialized(User)) {
ReportBug((char*) "INFO: mssql: Closing uninitialized mssql db %s", mssql_error());
return; // closing maybe when failed to init and reported bug then
}
save_info_string_to_mssql_syslog("close mssql");
mssql_close(User);
if (is_db_initialized(Script)) {
mssql_close(Script);
}
}
static void SetUserFileSystemBlock(void)
{
// these are dynamically stored, so CS can be a DLL.
userFileSystem.userCreate = mssqlUserCreate;
userFileSystem.userOpen = mssqlUserOpen;
userFileSystem.userClose = mssqlUserClose;
userFileSystem.userRead = mssqlUserRead;
userFileSystem.userWrite = mssqlUserWrite;
userFileSystem.userDelete = NULL;
filesystemOverride = MICROSOFTSQLFILES;
}
////////////////////////////////////
// SCRIPT ACCESS FUNCTIONS
////////////////////////////////////
/** buffer contains the mssql init string. */
/** database params like in cs_init are passed as argument. */
FunctionResult MsSqlScriptInitCode(char* buffer)
{
set_error_max("WARN");
char* params = ARGUMENT(1);
LoadMsSqlParams(params);
int rv = mssql_init(Script, mssqlhost, mssqlport,
mssqluser, mssqlpasswd, mssqldatabase);
if (rv) {
ReportBug((char*)"%s: mssql: Failed to connect to MSSQL: %s %s",
get_error_max(), params, mssql_error());
return FAILRULE_BIT;
}
return NOPROBLEM_BIT;
}
FunctionResult MsSqlScriptCloseCode(char* buffer)
{
set_error_max("WARN");
if (!is_db_initialized(Script)) {
ReportBug((char*) "INFO: mssql: Closing uninitialized mssql db %s", mssql_error());
return FAILRULE_BIT; // closing maybe when failed to init and reported bug then
}
save_info_string_to_mssql_syslog("close mssql");
mssql_close(Script);
return NOPROBLEM_BIT;
}
/** key is passed as argument 1, value is a string passed as argument 2 */
FunctionResult MsSqlScriptWriteCode(char* buffer)
{
set_error_max("WARN");
char* key = ARGUMENT(1);
char* data = ARGUMENT(2);
size_t buf_size = strlen(data) + 1;
int rv_w = mssql_file_write(Script, data, buf_size, (const char*) key);
if (rv_w) {
ReportBug( mssql_error() );
return FAILRULE_BIT;
}
return NOPROBLEM_BIT;
}
/** key is passed as argument 1. */
FunctionResult MsSqlScriptReadCode(char* buffer)
{
set_error_max("WARN");
char* key = ARGUMENT(1);
size_t buf_size = currentOutputLimit - (buffer - currentOutputBase) - 1; // in case of extra null terminate
int rv_w = mssql_file_read(Script, buffer, &buf_size, (const char*) key);
if (rv_w) {
ReportBug( mssql_error() );
return FAILRULE_BIT;
}
return NOPROBLEM_BIT;
}
#endif // ifndef DISCARD_MSSQL_INTERFACE_FOR_TEST
/** Low level functions for interfacing to ODBC */
struct DbInterface_t {
int used;
SQLHENV henv; // Environment handle
SQLHDBC hdbc; // Connection handle
SQLHSTMT hstmt_w; // Write statement handle
SQLHSTMT hstmt_r; // Read statement handle
bool write_prepared;
bool write_parameters_bound;
bool read_prepared;
bool read_parameters_bound;
bool use_stored_procedures;
bool use_tracing;
bool verbose;
SQLLEN file_buf_len; // how much is used
void* key_buf; // storage for key
SQLLEN key_buf_size; // allocated size
SQLLEN key_buf_len; // how much is used
bool is_empty; // no data in result set
bool is_initialized; // has finished initialization
};
static struct DbInterface_t db_list[2]; // one for file, one for scripting.
static char error_buf[1024]; // stores error statements
static char error_max[10] = "WARN"; // maximum error_level
static char in_conn_str[300]; // connection string built by us
static char out_conn_str[300]; // connection string returned by MS
static char tracing_filename[100];
const char* get_mssql_in_conn_str(void)
{
return in_conn_str;
}
const char* get_mssql_out_conn_str(void)
{
return out_conn_str;
}
const char* mssql_error(void)
{
return error_buf;
}
static void set_error_max(char* str) {
strcpy(error_max, str);
}
static const char* get_error_max() {
return error_max;
}
static void replace_char(char* str, char find, char replace)
{
char *current_pos = strchr(str,find);
while (current_pos){
*current_pos = replace;
current_pos = strchr(current_pos,find);
}
}
static void extract_error(const char *fn, SQLHANDLE handle, SQLSMALLINT type)
{
SQLSMALLINT i = 0;
SQLINTEGER NativeError;
SQLCHAR SQLState[7];
SQLCHAR MessageText[256];
SQLSMALLINT TextLength;
SQLRETURN ret;
int safe = 10;
snprintf(error_buf, sizeof(error_buf) - safe ,
"%s: mssql: The driver reported the following error %s ",
get_error_max(), fn);
do
{
ret = SQLGetDiagRec(type, // SQLSMALLINT HandleType,
handle, // SQLHANDLE Handle
++i, // SQLSMALLINT RecNumber
SQLState, // SQLCHAR * SQLState
&NativeError, // SQLINTEGER * NativeErrorPtr
MessageText, // SQLCHAR * MessageText
sizeof(MessageText), // SQLSMALLINT BufferLength
&TextLength); // SQLSMALLINT * TextLengthPtr
if (SQL_SUCCEEDED(ret)) {
snprintf(error_buf + strlen(error_buf), sizeof(error_buf) - safe,
"%s:%ld:%ld:%s ",
SQLState, (long)i, (long)NativeError, MessageText);
}
} while (ret == SQL_SUCCESS);
replace_char(error_buf, '\n', '*'); // some scripts fail on new lines
replace_char(error_buf, '\r', '*');
strcat(error_buf, " bwend\r\n"); // safe reserved space for this
}
static bool is_error(SQLRETURN e, const char* s, SQLHANDLE h, SQLSMALLINT t)
{
if ((e == SQL_SUCCESS) || (e == SQL_SUCCESS_WITH_INFO)) {
error_buf[0] = '\0';
return false;
}
extract_error(s, h, t);
return true;
}
static void* getHeap(size_t size) {
return malloc(size);
}
static void releaseHeap(void* ptr) {
free(ptr);
}
int mssql_init_db_struct(ConnectionId c_id)
{
unsigned int max_id = sizeof(db_list) / sizeof(db_list[0]);
if ((c_id < 0) || (max_id <= (unsigned int)c_id)) {
return -1;
}
struct DbInterface_t* dbp = &db_list[c_id];
if (dbp->used) {
return c_id;
}
dbp->verbose = false;
dbp->key_buf_size = 100;
dbp->key_buf = nullptr;
dbp->henv = SQL_NULL_HENV; // Environment handle
dbp->hdbc = SQL_NULL_HDBC; // Connection handle
dbp->hstmt_w = SQL_NULL_HSTMT; // Write statement handle
dbp->hstmt_r = SQL_NULL_HSTMT; // Write statement handle
dbp->write_prepared = false;
dbp->write_parameters_bound = false;
dbp->read_prepared = false;
dbp->read_parameters_bound = false;
dbp->use_stored_procedures = true;
dbp->use_tracing = false;
dbp->used = 1;
dbp->is_initialized = false;
return c_id;
}
static DbInterface_t* get_db(int id)
{
int array_size = sizeof(db_list)/sizeof(db_list[0]);
if ((id < 0) || (array_size <= id)) return nullptr;
DbInterface_t* dbp = &db_list[id];
return dbp;
}
static bool is_db_initialized(ConnectionId c_id)
{
DbInterface_t* dbp = get_db(c_id);
bool is_ok = ((dbp != nullptr) && (dbp->is_initialized));
return is_ok;
}
static void set_db_initialized(ConnectionId c_id, bool flag) {
DbInterface_t* dbp = get_db(c_id);
dbp->is_initialized = flag;
}
static void set_db_used(ConnectionId c_id, bool flag) {
DbInterface_t* dbp = get_db(c_id);
dbp->used = flag;
}
int mssql_set_verbose(int id, bool flag)
{
DbInterface_t* dbp = get_db(id);
if (dbp != nullptr) {
dbp->verbose = flag;
return 0;
}
return -1;
}
int mssql_use_stored_procedures(int id, bool flag)
{
DbInterface_t* dbp = get_db(id);
if (dbp != nullptr) {
dbp->use_stored_procedures = flag;
return 0;
}
return -1;
}
static bool free_statement_handle(DbInterface_t* dbp)
{
SQLRETURN rv;
if (dbp->hstmt_w != SQL_NULL_HSTMT) {
rv = SQLFreeHandle(SQL_HANDLE_STMT, dbp->hstmt_w);
if (is_error(rv, "SQLFreeHandle", dbp->hstmt_w, SQL_HANDLE_STMT)) {
return false;
}
dbp->hstmt_w = nullptr;
}
if (dbp->hstmt_r != SQL_NULL_HSTMT) {
rv = SQLFreeHandle(SQL_HANDLE_STMT, dbp->hstmt_r);
if (is_error(rv, "SQLFreeHandle", dbp->hstmt_r, SQL_HANDLE_STMT)) {
return false;
}
dbp->hstmt_r = nullptr;
}
return true;
}
static bool free_connection_handle(DbInterface_t* dbp)
{
SQLRETURN rv;
if (dbp->hdbc != SQL_NULL_HDBC) {
rv = SQLDisconnect(dbp->hdbc);
if (is_error(rv, "SQLDisconnect", dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
rv = SQLFreeHandle(SQL_HANDLE_DBC, dbp->hdbc);
if (is_error(rv, "SQLFreeHandle", dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
dbp->hdbc = nullptr;
}
return true;
}
static bool free_environment_handle(DbInterface_t* dbp)
{
SQLRETURN rv;
if (dbp->henv != SQL_NULL_HENV) {
rv = SQLFreeHandle(SQL_HANDLE_ENV, dbp->henv);
if (is_error(rv, "SQLFreeHandle", dbp->henv, SQL_HANDLE_ENV)) {
return false;
}
dbp->henv = nullptr;
}
return true;
}
static bool deinit_database_interface_struct(DbInterface_t* dbp)
{
uninit_z_buffer();
releaseHeap(dbp->key_buf);
dbp->key_buf = nullptr;
dbp->key_buf_size = 0;
dbp->write_prepared = false;
dbp->write_parameters_bound = false;
dbp->read_prepared = false;
dbp->used = 0;
return true;
}
int mssql_close(int id)
{
DbInterface_t* dbp = get_db(id);
bool ok = (dbp != nullptr);
ok = ok & free_statement_handle(dbp);
ok = ok & free_connection_handle(dbp);
ok = ok & free_environment_handle(dbp);
ok = ok & deinit_database_interface_struct(dbp);
if (ok) {
set_db_initialized((ConnectionId)id, false);
}
int rv = (ok ? 0 : -1);
return rv;
}
static bool alloc_buffers(DbInterface_t* dbp)
{
init_z_buffer((SQLLEN)userCacheSize + OVERFLOW_SAFETY_MARGIN);
if (z_buffer == nullptr) {
snprintf(error_buf, sizeof(error_buf),
"%s: mssql: Unable to allocate %ld bytes for file buffer",
get_error_max(), (long) z_buffer_size);
return false;
}
dbp->key_buf = getHeap(dbp->key_buf_size);
if (dbp->key_buf == nullptr) {
snprintf(error_buf, sizeof(error_buf),
"%s: mssql: Unable to allocate %ld bytes for key buffer",
get_error_max(), (long) dbp->key_buf_size);
return false;
}
return true;
}
static bool alloc_environment_handle(DbInterface_t* dbp)
{
SQLRETURN retcode;
retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &dbp->henv);
if (is_error(retcode, "SQLAllocHandle(SQL_HANDLE_ENV)",
dbp->henv, SQL_HANDLE_ENV)) {
return false;
}
return true;
}
static bool set_ODBC_version(DbInterface_t* dbp)
{
SQLRETURN retcode;
retcode = SQLSetEnvAttr(dbp->henv, SQL_ATTR_ODBC_VERSION,
(SQLPOINTER*)SQL_OV_ODBC3, 0);
if (is_error(retcode, "SQLSetEnvAttr(SQL_ATTR_ODBC_VERSION)",
dbp->henv, SQL_HANDLE_ENV)) {
return false;
}
return true;
}
static bool alloc_connection_handle(DbInterface_t* dbp)
{
SQLRETURN retcode;
retcode = SQLAllocHandle(SQL_HANDLE_DBC, dbp->henv, &dbp->hdbc);
if (is_error(retcode, "SQLAllocHandle(SQL_HANDLE_DBC)",
dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
return true;
}
static bool set_login_timeout(DbInterface_t* dbp)
{
// I know the below does not make sense because
// a number is being used as a pointer,
// but it comes directly from this MS page:
// https://docs.microsoft.com/en-us/sql/odbc/reference/syntax/sqlconnect-function?view=sql-server-ver15
SQLRETURN retcode;
retcode = SQLSetConnectAttr(dbp->hdbc,
SQL_LOGIN_TIMEOUT,
(SQLPOINTER)5, // login time in s
0);
if (is_error(retcode, "SQLSetConnectAttr(SQL_LOGIN_TIMEOUT)",
dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
return true;
}
static bool set_tracing(DbInterface_t* dbp) {
SQLRETURN retcode;
if (dbp->use_tracing) {
retcode = SQLSetConnectAttr(dbp->hdbc,
SQL_ATTR_TRACEFILE,
tracing_filename,
SQL_NTS);
if (is_error(retcode, "SQLSetConnectAttr - SQL_ATTR_TRACEFILE",
dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
retcode = SQLSetConnectAttr(dbp->hdbc,
SQL_ATTR_TRACE,
(void*)SQL_OPT_TRACE_ON,
SQL_NTS);
if (is_error(retcode, "SQLSetConnectAttr - SQL_ATTR_TRACE",
dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
}
else {
retcode = SQLSetConnectAttr(dbp->hdbc,
SQL_ATTR_TRACE,
(void*)SQL_OPT_TRACE_OFF,
SQL_NTS);
if (is_error(retcode, "SQLSetConnectAttr - SQL_ATTR_TRACE",
dbp->hdbc, SQL_HANDLE_DBC)) {
return false;
}
}
return true;
}
static bool connect(DbInterface_t* dbp,
const char* host,
const char* host_port,
const char* user,
const char* pwd,
const char* database)
{
SQLRETURN retcode;
SQLSMALLINT outstrlen;
const char *driver = "ODBC Driver 17 for SQL Server";
snprintf(in_conn_str, sizeof(in_conn_str),
"DRIVER=%s; SERVER=%s,%s; DATABASE=%s; UID=%s; PWD=%s",
driver, host, host_port, database, user, pwd);
if (dbp->verbose) {
printf("in_conn_str %s\n", in_conn_str);
}
HWND dhandle = nullptr;
SQLSMALLINT in_len = (SQLSMALLINT) strlen(in_conn_str);
outstrlen = sizeof(out_conn_str);
retcode = SQLDriverConnect(dbp->hdbc, // SQLHDBC ConnectionHandle
dhandle, // SQLHWND WindowHandle
(SQLCHAR*)in_conn_str, // SQLCHAR * InConnectionString
in_len, // SQLSMALLINT StringLength1
(SQLCHAR*)out_conn_str, // SQLCHAR * OutConnectionString
outstrlen, // SQLSMALLINT BufferLength
&outstrlen, // SQLSMALLINT * StringLength2Ptr
SQL_DRIVER_COMPLETE); // SQLUSMALLINT DriverCompletion
if (dbp->verbose) {
printf("connect outstrlen %d\n", outstrlen);
if (0 < outstrlen) {
printf("outstr: %s\n", out_conn_str);
}
}
if (retcode == SQL_SUCCESS) {
if (dbp->verbose) {
printf("Connect: SQL_SUCCESS\n");
}
return true;
}
else if (retcode == SQL_SUCCESS_WITH_INFO) {
if (dbp->verbose) {
extract_error("SQLDriverConnect", dbp->hdbc, SQL_HANDLE_DBC);
printf("Got SQL_SUCCESS_WITH_INFO %s\n", error_buf);
}
return true;
}
is_error(retcode, "SQLDriverConnect", dbp->hdbc, SQL_HANDLE_DBC);
return false;
}
static bool alloc_statement_handles(DbInterface_t* dbp)
{
SQLRETURN retcode;
retcode = SQLAllocHandle(SQL_HANDLE_STMT, dbp->hdbc, &dbp->hstmt_w);
if (is_error(retcode, "SQLAllocHandle(SQL_HANDLE_STMT)",
dbp->hstmt_w, SQL_HANDLE_STMT)) {
return false;
}
retcode = SQLAllocHandle(SQL_HANDLE_STMT, dbp->hdbc, &dbp->hstmt_r);
if (is_error(retcode, "SQLAllocHandle(SQL_HANDLE_STMT)",
dbp->hstmt_r, SQL_HANDLE_STMT)) {
return false;
}
return true;
}
int mssql_init(int id,
const char* host,
const char* host_port,
const char* user,
const char* pwd,
const char* database)
{
if (is_db_initialized((ConnectionId)id)) {
return 0;
}
mssql_init_db_struct((ConnectionId)id);
DbInterface_t* dbp = get_db(id);
bool ok = (dbp != nullptr);
ok = ok && alloc_buffers(dbp);
ok = ok && alloc_environment_handle(dbp);
ok = ok && set_ODBC_version(dbp);
ok = ok && alloc_connection_handle(dbp);
ok = ok && set_login_timeout(dbp);
ok = ok && set_tracing(dbp);
ok = ok && connect(dbp, host, host_port, user, pwd, database);
ok = ok && alloc_statement_handles(dbp);
if (ok) {
set_db_initialized((ConnectionId)id, true);
}
return (ok ? 0 : -1);
}
static bool empty_result_set(SQLHSTMT hstmt)
{
while (SQLMoreResults(hstmt) == SQL_SUCCESS) {
;
}
return true;
}
static bool file_check_key_size(DbInterface_t* dbp, const char* key) {
size_t key_len = strlen(key) + 1;
bool ok = (key_len < (size_t)dbp->key_buf_size);
if (!ok) {
sprintf(error_buf, "ERROR: mssql: key too big. key size %zu", key_len);
return false;
}
return true;
}
static bool file_write_preformat_data(DbInterface_t* dbp, const void* buf, size_t buf_size)
{
size_t cushion = 20;
if (z_buffer_size < (SQLLEN)(buf_size + cushion)) {
sprintf(error_buf, "%s: mssql: file too big. file size %zu",
get_error_max(), buf_size);
return false;
}
if (buf != z_buffer) { // only copy if buffers are not the same
memcpy(z_buffer, buf, buf_size);
}
dbp->file_buf_len = buf_size;
if (dbp->verbose) {
printf("write size %ld\n", (long) dbp->file_buf_len);
}
return true;
}
static bool file_write_bind_params(DbInterface_t* dbp)
{
if (!dbp->write_parameters_bound) { // only bind once
SQLRETURN retcode;
SQLULEN p1_column_size = 100;
SQLSMALLINT p1_digits = 0;
dbp->key_buf_len = dbp->key_buf_size;
retcode = SQLBindParameter(dbp->hstmt_w, // StatementHandle
1, // ParameterNumber
SQL_PARAM_INPUT, // InputOutputType
SQL_C_CHAR, // ValueType
SQL_VARCHAR, // ParameterType
p1_column_size, // ColumnSize
p1_digits, // DecimalDigits
(SQLPOINTER) dbp->key_buf, // ParameterValuePtr
dbp->key_buf_size, // BufferLength
&dbp->key_buf_len); // StrLen_or_IndPtr
if (is_error(retcode, "SQLBindParameter", dbp->hstmt_w, SQL_HANDLE_STMT)) {
printf("%s\n", error_buf);
return false;
}
SQLULEN p2_column_size = z_buffer_size;
SQLSMALLINT p2_digits = 0;
retcode = SQLBindParameter(dbp->hstmt_w, // StatementHandle
2, // ParameterNumber
SQL_PARAM_INPUT, // InputOutputType
SQL_C_BINARY, // ValueType
SQL_LONGVARBINARY, // ParameterType
p2_column_size, // ColumnSize
p2_digits, // DecimalDigits
z_buffer, // ParameterValuePtr
dbp->file_buf_len, // BufferLength, ignored for writes
&dbp->file_buf_len); // StrLen_or_IndPtr
if (is_error(retcode, "SQLBindParameter", dbp->hstmt_w, SQL_HANDLE_STMT)) {
printf("%s\n", error_buf);
return false;
}
dbp->write_parameters_bound = true;
}
return true;
}
static bool file_write_copy_key(DbInterface_t* dbp, const char* key)
{
dbp->key_buf_len = strlen(key);
memcpy(dbp->key_buf, key, dbp->key_buf_len);
return true;
}
static bool file_write_prepare(DbInterface_t* dbp)
{
if (!dbp->write_prepared) { // only prepare once
const char* upsert_sql = ""
"MERGE INTO userState AS t "
" USING "
" (SELECT pk=?, f1= ?) AS s "
" ON t.userid = s.pk "
" WHEN MATCHED THEN "
" UPDATE SET userid=s.pk, ustate=s.f1 "
" WHEN NOT MATCHED THEN "
" INSERT (userid, ustate) "
" VALUES (s.pk, s.f1); "
"";
const char* upsert_sp= ""
"{ CALL spChatScript_UpsertByUserId( ?, ? ) }";
// "{ CALL uspSetUserData( ?, ? ) }";
const char* upsert = (dbp->use_stored_procedures ? upsert_sp : upsert_sql);
SQLRETURN retcode;
retcode = SQLPrepare(dbp->hstmt_w, (SQLCHAR*)upsert, SQL_NTS);
if (is_error(retcode, "SQLPrepare", dbp->hstmt_w, SQL_HANDLE_STMT)) {
printf("%s\n", error_buf);
return false;
}
SQLSMALLINT num_params;
SQLNumParams(dbp->hstmt_w, &num_params);
int expected_num_params = 2;
if (num_params != expected_num_params) {
return false;
}
dbp->write_prepared = true;
}
return true;
}
static bool file_write_execute(DbInterface_t* dbp)
{
SQLRETURN retcode;
retcode = SQLExecute(dbp->hstmt_w);
if (is_error(retcode, "SQLExecute", dbp->hstmt_w, SQL_HANDLE_STMT)) {
printf("%s\n", error_buf);
return false;
}
return true;
}
int mssql_file_write(int id, const void* buf, size_t buf_size, const char* key)
{
DbInterface_t* dbp = get_db(id);
bool ok = (dbp != nullptr);
ok = ok && file_check_key_size(dbp, key);
ok = ok && file_write_preformat_data(dbp, buf, buf_size);
ok = ok && file_write_prepare(dbp);
ok = ok && file_write_bind_params(dbp);
ok = ok && file_write_copy_key(dbp, key);
ok = ok && file_write_execute(dbp);
ok = ok && empty_result_set(dbp->hstmt_w);
int ret_val = (ok ? 0 : -1);
return ret_val;
}
static bool file_read_init(DbInterface_t* dbp, const char* key)
{
dbp->is_empty = false;
dbp->key_buf_len = strlen(key);
memcpy(dbp->key_buf, key, dbp->key_buf_len);
dbp->file_buf_len = z_buffer_size;
return true;
}
static bool file_read_bind(DbInterface_t* dbp, const char* key)
{
if (!dbp->read_parameters_bound) {
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