Re: [mongodb-user] Authentication and C-Driver

[Jared Cottrell]

Hi Gary,

Below is a recent Stack Overflow thread that might help. Of course, feel free to contact us at any time at sup...@mongolab.com.

Cheers!

Jared

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http://stackoverflow.com/questions/11253337/mongodb-c-driver-authentication

---

Here's the function to call.

MONGO_EXPORT int mongo_cmd_authenticate     (

        mongo *         conn,

        const char *    db,

        const char *    user,

        const char *    pass

    )


Authenticate a user.


Parameters:

        conn    a mongo object.

        db      the database to authenticate against.

        user    the user name to authenticate.

        pass    the user's password.


Returns:

    MONGO_OK on sucess and MONGO_ERROR on failure.

Here's an excerpt from the test code as an example - mongo-c-driver/test/auth_test.c

if ( mongo_connect( conn , TEST_SERVER, 27017 ) ) {

    printf( "failed to connect\n" );

    exit( 1 );

}


ASSERT( mongo_cmd_authenticate( conn, db, "user", "password" ) == MONGO_OK );


...

Hope that this helps. Here are some links for futher information.

References:

MongoDB C Language Center - http://www.mongodb.org/display/DOCS/C+Language+Center

MongoDB C Driver Documentation - http://api.mongodb.org/c/current/

MongoDB C Driver API Docs - http://api.mongodb.org/c/current/api/index.html

mongo.h File Referenc - http://api.mongodb.org/c/current/api/mongo_8h.html

mongo_cmd_authenticate -http://api.mongodb.org/c/current/api/mongo_8h.html#a715aaa6b82e23486e6caad2b544f2ebf

MongoDB C Driver source code - https://github.com/mongodb/mongo-c-driver

test/auth_test.c - https://github.com/mongodb/mongo-c-driver/blob/master/test/auth_test.c

On Sat, Sep 29, 2012 at 10:01 AM, Gary Pickrell <lifeo...@gmail.com> wrote:

I'm using the C Driver to write an app to use with mongolab.com  I'm able to communicate with my local server which doesn't require authentication, but not with MongoLab which does.  I figure I need to use mongo_cmd_authenticate() but don't have any context for it.  Any recommendations?

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[Gary Pickrell]

Hi Jared,

Thanks for the information from Stack Overflow.  It is useful.  It shows how to use the authentication function but it doesn't put it in context, ie when to use it.

     -Gary

[Jared D. Cottrell]

Hi Gary,

You usually want to call authenticate right after you establish the basic connection. I'm not very familiar with the C driver myself, but it looks like the basic connection is established with a call to mongo_connect(). So, as in the example, you'll likely want to call mongo_cmd_authenticate() right after that so that anything later using the connection already has the privileges of your user.

if ( mongo_connect( conn , TEST_SERVER, 27017 ) ) {

    printf( "failed to connect\n" );

    exit( 1 );

}

ASSERT( mongo_cmd_authenticate( conn, db, "user", "password" ) == MONGO_OK );

Cheers!

Jared

[Gary Pickrell]

Hello Jared,

Thank you!  This is very helpful.  If I have more problems I will email mongolabs for help.

[Bruce Zhao]

This is a function in my project.

int CMongoClient::connect(const string &host, int port, const string &db, const string &user, const string &password)
{
int iStatus;
stringstream ss;

  //Check parameter
if (host.empty()) {
  m_lastError = "host is empty.";
return -1;
}
if (port == 0)
port = MONGO_DEFAULT_PORT; //27017
if (user.empty()) {
  m_lastError = "user is empty.";
return -1;
}
if (password.empty()) {
  m_lastError = "password is empty";
return -1;
}

  //connect
iStatus = mongo_connect(m_conn, host.c_str(), port);
if (iStatus == MONGO_ERROR) {
  //failure
iStatus = m_conn->err;

   ss << "Error code:" << iStatus << ", error message:" << MONGO_ERRORS[iStatus];

m_lastError = ss.str();
return -1;
}

//authenticate

iStatus = mongo_cmd_authenticate(m_conn, db.c_str(), user.c_str(), password.c_str());
if (iStatus == MONGO_ERROR) {
  ss << "User " << user << " authenticate fail，please check the username and password.";
m_lastError = ss.str();
return -1;
}

return MONGO_OK;
}

2012/10/2 Gary Pickrell <lifeo...@gmail.com>

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