(C) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

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#include <C_CkHttp.h>
#include <C_CkCert.h>
#include <C_CkCertChain.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    HCkCert sslCert;
    HCkCertChain certChain;
    int i;
    int numCerts;
    HCkCert cert;
    HCkCert caCert;

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

    http = CkHttp_Create();

    // We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
    sslCert = CkHttp_GetServerSslCert(http,"nationalgeographic.com",443);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        return;
    }

    // Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
    // be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
    // will be returned.  The certificate chain's ReachesRoot property can be examined to 
    // see if the chain was completed to the root.
    certChain = CkCert_GetCertChain(sslCert);
    if (CkCert_getLastMethodSuccess(sslCert) == FALSE) {
        printf("%s\n",CkCert_lastErrorText(sslCert));
        CkCert_Dispose(sslCert);
        CkHttp_Dispose(http);
        return;
    }

    i = 0;
    numCerts = CkCertChain_getNumCerts(certChain);
    while (i < numCerts) {
        cert = CkCertChain_GetCert(certChain,i);
        printf("SubjectDN %d: %s\n",i,CkCert_subjectDN(cert));
        printf("IssuerDN %d: %s\n",i,CkCert_issuerDN(cert));
        CkCert_Dispose(cert);
        i = i + 1;
    }

    // If the certificate chain reaches the root CA cert, then the last cert in the chain
    // is the root CA cert.
    if (CkCertChain_getReachesRoot(certChain) == TRUE) {
        caCert = CkCertChain_GetCert(certChain,numCerts - 1);
        printf("CA Root Cert: %s\n",CkCert_subjectDN(caCert));
        CkCert_Dispose(caCert);
    }

    CkCert_Dispose(sslCert);
    CkCertChain_Dispose(certChain);


    CkHttp_Dispose(http);

    }