Cannot connect to Oracle 19 with unixODBC - oracle

Question

I'm trying to connect to an Oracle 19 database using unixODBC 2.3.7.
I'm using the Oracle Developer Days VirtualBox VM.
When trying to troubleshoot via isql I always get this error:
# isql -v -3 oracledsn
[HY000][unixODBC][Oracle][ODBC][Ora]ORA-12545: Connect failed because target host or object does not exist
[ISQL]ERROR: Could not SQLConnect
Sadly I can't reproduce it now, but when last trying it I always had
[IM004][unixODBC][Driver Manager]Driver's SQLAllocHandle on SQL_HANDLE_HENV failed
[ISQL]ERROR: Could not SQLConnect
This is the same error message I get from my (proprietary) C++ code, so I'm pretty sure the problem is just the connection settings.
I have checked https://www.connectionstrings.com/oracle/ but none of the combinations work.
Here are all my config settings:
# odbcinst -j -130-
unixODBC 2.3.7
DRIVERS............: /usr/local/etc/odbcinst.ini
SYSTEM DATA SOURCES: /usr/local/etc/odbc.ini
FILE DATA SOURCES..: /usr/local/etc/ODBCDataSources
USER DATA SOURCES..: /home/florian/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8
# cat /usr/local/etc/odbcinst.ini
[oraclex]
Description = Oracle ODBC driver for Oracle 19
Driver = /mnt/libsqora.so.19.1
Setup =
FileUsage =
CPTimeout =
CPReuse =
Driver Logging = 7
[ODBC]
Trace = Yes
TraceFile = /tmp/odbc.log
ForceTrace = Yes
Pooling = No
DEBUG = 1
# cat ~/.odbc.ini
[oracledsn]
Driver = oraclex
Server = 10.1.6.19
Port = 1521
Uid = system
Pwd = oracle
Database = orclcdb/orcl/"<empty>"
ORA-12545: Connect failed because target host or object does not exist
I also tried ServerName
ServerName = //10.1.6.19/orclcdb or //10.1.6.19/orcl
[28000][unixODBC][Oracle][ODBC][Ora]ORA-01017: invalid username/password; logon denied
Here's the /tmp/odbc.log:
[ODBC][18832][1564563250.044774][__handles.c][460]
Exit:[SQL_SUCCESS]
Environment = 0x1fd7780
[ODBC][18832][1564563250.044854][SQLSetEnvAttr.c][189]
Entry:
Environment = 0x1fd7780
Attribute = SQL_ATTR_ODBC_VERSION
Value = 0x3
StrLen = 0
[ODBC][18832][1564563250.044886][SQLSetEnvAttr.c][381]
Exit:[SQL_SUCCESS]
[ODBC][18832][1564563250.044914][SQLAllocHandle.c][377]
Entry:
Handle Type = 2
Input Handle = 0x1fd7780
[ODBC][18832][1564563250.044944][SQLAllocHandle.c][493]
Exit:[SQL_SUCCESS]
Output Handle = 0x1fd8090
[ODBC][18832][1564563250.044983][SQLConnect.c][3721]
Entry:
Connection = 0x1fd8090
Server Name = [oracledsn][length = 9 (SQL_NTS)]
User Name = [NULL]
Authentication = [NULL]
UNICODE Using encoding ASCII 'ANSI_X3.4-1968' and UNICODE 'UCS-2LE'
DIAG [HY000] [Oracle][ODBC][Ora]ORA-12545: Connect failed because target host or object does not exist
[ODBC][18832][1564563250.082037][SQLConnect.c][4244]
Exit:[SQL_ERROR]
[ODBC][18832][1564563250.082070][SQLGetDiagRec.c][677]
Entry:
Connection = 0x1fd8090
Rec Number = 1
SQLState = 0x7fffeabcac60
Native = 0x7fffeabcac5c
Message Text = 0x7fffeabcac70
Buffer Length = 500
Text Len Ptr = 0x7fffeabcac5a
[ODBC][18832][1564563250.082092][SQLGetDiagRec.c][726]
Exit:[SQL_SUCCESS]
SQLState = HY000
Native = 0x7fffeabcac5c -> 12545
Message Text = [[unixODBC][Oracle][ODBC][Ora]ORA-12545: Connect failed because target host or object does not exist
I've also been trying out this C code from https://www.easysoft.com/developer/languages/c/odbc_tutorial.html#connect_full - basically the same result.
# cat test2.c
# compile with gcc -I ../include test2.c -o test2 -lodbc
#include <stdio.h>
#include <sql.h>
#include <sqlext.h>
/*
* see Retrieving ODBC Diagnostics
* for a definition of extract_error().
*/
static void extract_error(
char *fn,
SQLHANDLE handle,
SQLSMALLINT type);
main() {
SQLHENV env;
SQLHDBC dbc;
SQLHSTMT stmt;
SQLRETURN ret; /* ODBC API return status */
SQLCHAR outstr[1024];
SQLSMALLINT outstrlen;
/* Allocate an environment handle */
SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env);
/* We want ODBC 3 support */
SQLSetEnvAttr(env, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);
/* Allocate a connection handle */
SQLAllocHandle(SQL_HANDLE_DBC, env, &dbc);
/* Connect to the DSN mydsn */
ret = SQLDriverConnect(dbc, NULL, "DSN=oracledsn;", SQL_NTS,
outstr, sizeof(outstr), &outstrlen,
SQL_DRIVER_COMPLETE);
if (SQL_SUCCEEDED(ret)) {
printf("Connected\n");
printf("Returned connection string was:\n\t%s\n", outstr);
if (ret == SQL_SUCCESS_WITH_INFO) {
printf("Driver reported the following diagnostics\n");
//extract_error("SQLDriverConnect", dbc, SQL_HANDLE_DBC);
}
SQLDisconnect(dbc); /* disconnect from driver */
} else {
fprintf(stderr, "Failed to connect\n");
//extract_error("SQLDriverConnect", dbc, SQL_HANDLE_DBC);
}
/* free up allocated handles */
SQLFreeHandle(SQL_HANDLE_DBC, dbc);
SQLFreeHandle(SQL_HANDLE_ENV, env);
}
As another point reference I can connect to said Oracle Dev VM with sqlplus from another machine like this:
./sqlplus sys/oracle#10.1.6.19/orclcdb as sysdba
SQL>
./sqlplus system/oracle#10.1.6.19/orclcdb
SQL>
On the VM I have a file /u01/app/oracle/product/version/db_1/network/admin/tnsnames.ora but I am not completely sure if I also need one on the client?
ORCLCDB=localhost:1521/orclcdb
ORCL=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)

Answer 1

I finally found the solution, although this is for 12.2.0.1 and not 19
# cat .odbc.ini
[oracledsn]
Driver=oracle
UID=system
PWD=oracle
DBQ=192.168.178.32:1521/ORCLCDB
ServerName=//192.168.178.32:1521/ORCLCDB
cat /usr/local/etc/odbcinst.ini
[oracle]
Description = foo
Driver = /mnt/libsqora.so.19.1
Driver Logging = 7
UsageCount=1
FileUsage=1
[ODBC]
Trace = Yes
TraceFile = /tmp/odbc.log
ForceTrace = Yes
Pooling = No
# LD_LIBRARY_PATH=. isql -v oracledsn system oracle
+---------------------------------------+
| Connected! |
I have no Oracle-specific environment variables set, but if it works if I take the value of ServerName verbatim for TWO_TASK.

Answer 2

I had success with oracle 19c, with one minor change here - remove the "//" from ServerName i.e.
ServerName=192.168.178.32:1521/ORCLCDB