(Objective-C) SSL Server Example

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit.

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#import <CkoSocket.h>
#import <CkoCertStore.h>
#import <CkoCert.h>
#import <NSString.h>

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoSocket *listenSslSocket = [[CkoSocket alloc] init];

// An SSL server needs a digital certificate.  This example loads it from a PFX file.

// Create an instance of a certificate store object, load a PFX file,
// locate the certificate we need, and use it.
// (a PFX file may contain more than one certificate.)
CkoCertStore *certStore = [[CkoCertStore alloc] init];
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
BOOL success = [certStore LoadPfxFile: @"chilkat.pfx" password: @"test"];
if (success != YES) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

// Find the certificate to be used for SSL:
CkoCert *cert = 0;
cert = [certStore FindCertBySubject: @"Chilkat Software, Inc."];
if (certStore.LastMethodSuccess == NO) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

// Use the certificate:
success = [listenSslSocket InitSslServer: cert];
if (success != YES) {

    NSLog(@"%@",listenSslSocket.LastErrorText);
    return;
}

// Bind and listen on a port:
int myPort = 8123;
// Allow for a max of 5 queued connect requests.
int backLog = 5;
success = [listenSslSocket BindAndListen: [NSNumber numberWithInt: myPort] backlog: [NSNumber numberWithInt: backLog]];
if (success != YES) {
    NSLog(@"%@",listenSslSocket.LastErrorText);
    return;
}

// If accepting an SSL/TLS connection, the SSL handshake is part of the connection
// establishment process. This involves a few back-and-forth messages between the 
// client and server to establish algorithms and a shared key to create the secure 
// channel. The sending and receiving of these messages are governed by the 
// MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
// (and this is the default unless changed by your application), then the 
// AcceptNextConnection can hang indefinitely during the SSL handshake process. 
// Make sure these properties are set to appropriate values before calling AcceptNextConnection.

// Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.MaxReadIdleMs = [NSNumber numberWithInt:10000];
listenSslSocket.MaxSendIdleMs = [NSNumber numberWithInt:10000];

// Accept a single client connection and establish the secure SSL/TLS channel:
CkoSocket *clientSock = 0;
int maxWaitMillisec = 20000;
clientSock = [listenSslSocket AcceptNextConnection: [NSNumber numberWithInt: maxWaitMillisec]];
if (listenSslSocket.LastMethodSuccess == NO) {
    NSLog(@"%@",listenSslSocket.LastErrorText);
    return;
}

// The client (in this example) is going to send a "Hello Server! -EOM-" 
// message.  Read it:
NSString *receivedMsg = [clientSock ReceiveUntilMatch: @"-EOM-"];
if (clientSock.LastMethodSuccess != YES) {
    NSLog(@"%@",clientSock.LastErrorText);
    return;
}

NSLog(@"%@",receivedMsg);

// Send a "Hello Client! -EOM-" message:
success = [clientSock SendString: @"Hello Client! -EOM-"];
if (success != YES) {
    NSLog(@"%@",clientSock.LastErrorText);
    return;
}

// Close the connection with the client
// Wait a max of 20 seconds (20000 millsec)
success = [clientSock Close: [NSNumber numberWithInt: 20000]];