libcurl_cacertinmem.hpp

#ifndef LIBCURL_CACERTINMEM_HPP
#define LIBCURL_CACERTINMEM_HPP

#include<openssl/err.h>
#include<openssl/ssl.h>
#include<curl/curl.h>
#include<stdio.h>


static size_t writefunction(void* ptr,size_t size,size_t nmemb,void *stream){
    fwrite(ptr,size,nmemb,(FILE*)stream);
    return (nmemb*size);
}

static CURLcode sslctx_function(CURL *curl,void *sslctx,void *param){
    CURLcode rv = CURLE_ABORTED_BY_CALLBACK;
    static const char mypem[] =
            "-----BEGIN CERTIFICATE-----\n"
                "MIIH0zCCBbugAwIBAgIIXsO3pkN/pOAwDQYJKoZIhvcNAQEFBQAwQjESMBAGA1UE\n"
                "AwwJQUNDVlJBSVoxMRAwDgYDVQQLDAdQS0lBQ0NWMQ0wCwYDVQQKDARBQ0NWMQsw\n"
                "CQYDVQQGEwJFUzAeFw0xMTA1MDUwOTM3MzdaFw0zMDEyMzEwOTM3MzdaMEIxEjAQ\n"
                "BgNVBAMMCUFDQ1ZSQUlaMTEQMA4GA1UECwwHUEtJQUNDVjENMAsGA1UECgwEQUND\n"
                "VjELMAkGA1UEBhMCRVMwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCb\n"
                "qau/YUqXry+XZpp0X9DZlv3P4uRm7x8fRzPCRKPfmt4ftVTdFXxpNRFvu8gMjmoY\n"
                "HtiP2Ra8EEg2XPBjs5BaXCQ316PWywlxufEBcoSwfdtNgM3802/J+Nq2DoLSRYWo\n"
                "G2ioPej0RGy9ocLLA76MPhMAhN9KSMDjIgro6TenGEyxCQ0jVn8ETdkXhBilyNpA\n"
                "0KIV9VMJcRz/RROE5iZe+OCIHAr8Fraocwa48GOEAqDGWuzndN9wrqODJerWx5eH\n"
                "k6fGioozl2A3ED6XPm4pFdahD9GILBKfb6qkxkLrQaLjlUPTAYVtjrs78yM2x/47\n"
                "JyCpZET/LtZ1qmxNYEAZSUNUY9rizLpm5U9EelvZaoErQNV/+QEnWCzI7UiRfD+m\n"
                "AM/EKXMRNt6GGT6d7hmKG9Ww7Y49nCrADdg9ZuM8Db3VlFzi4qc1GwQA9j9ajepD\n"
                "vV+JHanBsMyZ4k0ACtrJJ1vnE5Bc5PUzolVt3OAJTS+xJlsndQAJxGJ3KQhfnlms\n"
                "tn6tn1QwIgPBHnFk/vk4CpYY3QIUrCPLBhwepH2NDd4nQeit2hW3sCPdK6jT2iWH\n"
                "7ehVRE2I9DZ+hJp4rPcOVkkO1jMl1oRQQmwgEh0q1b688nCBpHBgvgW1m54ERL5h\n"
                "I6zppSSMEYCUWqKiuUnSwdzRp+0xESyeGabu4VXhwOrPDYTkF7eifKXeVSUG7szA\n"
                "h1xA2syVP1XgNce4hL60Xc16gwFy7ofmXx2utYXGJt/mwZrpHgJHnyqobalbz+xF\n"
                "d3+YJ5oyXSrjhO7FmGYvliAd3djDJ9ew+f7Zfc3Qn48LFFhRny+Lwzgt3uiP1o2H\n"
                "pPVWQxaZLPSkVrQ0uGE3ycJYgBugl6H8WY3pEfbRD0tVNEYqi4Y7\n"
                "-----END CERTIFICATE-----\n"
                "-----BEGIN CERTIFICATE-----\n"
                "MIIFtTCCA52gAwIBAgIIYY3HhjsBggUwDQYJKoZIhvcNAQEFBQAwRDEWMBQGA1UE\n"
                "AwwNQUNFRElDT00gUm9vdDEMMAoGA1UECwwDUEtJMQ8wDQYDVQQKDAZFRElDT00x\n"
                "CzAJBgNVBAYTAkVTMB4XDTA4MDQxODE2MjQyMloXDTI4MDQxMzE2MjQyMlowRDEW\n"
                "MBQGA1UEAwwNQUNFRElDT00gUm9vdDEMMAoGA1UECwwDUEtJMQ8wDQYDVQQKDAZF\n"
                "RElDT00xCzAJBgNVBAYTAkVTMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKC\n"
                "AgEA/5KV4WgGdrQsyFhIyv2AVClVYyT/kGWbEHV7w2rbYgIB8hiGtXxaOLHkWLn7\n"
                "09gtn70yN78sFW2+tfQh0hOR2QetAQXW8713zl9CgQr5auODAKgrLlUTY4HKRxx7\n"
                "XBZXehuDYAQ6PmXDzQHe3qTWDLqO3tkE7hdWIpuPY/1NFgu3e3eM+SW10W2ZEi5P\n"
                "gvoFNTPhNahXwOf9jU8/kzJPeGYDdwdY6ZXIfj7QeQCM8htRM5u8lOk6e25SLTKe\n"
                "I6RF+7YuE7CLGLHdztUdp0J/Vb77W7tH1PwkzQSulgUV1qzOMPPKC8W64iLgpq0i\n"
                "5ALudBF/TP94HTXa5gI06xgSYXcGCRZj6hitoocf8seACQl1ThCojz2GuHURwCRi\n"
                "ipZ7SkXp7FnFvmuD5uHorLUwHv4FB4D54SMNUI8FmP8sX+g7tq3PgbUhh8oIKiMn\n"
                "MCArz+2UW6yyetLHKKGKC5tNSixthT8Jcjxn4tncB7rrZXtaAWPWkFtPF2Y9fwsZ\n"
                "o5NjEFIqnxQWWOLcpfShFosOkYuByptZ+thrkQdlVV9SH686+5DdaaVbnG0OLLb6\n"
                "zqylfDJKZ0DcMDQj3dcEI2bw/FWAp/tmGYI1Z2JwOV5vx+qQQEQIHriy1tvuWacN\n"
                "GHk0vFQYXlPKNFHtRQrmjseCNj6nOGOpMCwXEGCSn1WHElkQwg9naRHMTh5+Spqt\n"
                "r0CodaxWkHS4oJyleW/c6RrIaQXpuvoDs3zk4E7Czp3otkYNbn5XOmeUwssfnHdK\n"
                "Z05phkOTOPu220+DkdRgfks+KzgHVZhepA==\n"
                "-----END CERTIFICATE-----\n";

    BIO *cbio = BIO_new_mem_buf(mypem,sizeof(mypem));
    X509_STORE *pCts = SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
    int i;
    STACK_OF(X509_INFO) *pInfo;
    (void)curl;
    (void)param;

    if(!pCts ||!cbio){
        return rv;
    }

    pInfo = PEM_X509_INFO_read_bio(cbio,NULL,NULL,NULL);

    if(!pInfo){
        BIO_free(cbio);
        return rv;
    }

    for(i=0;i<sk_X509_INFO_num(pInfo);i++){
        X509_INFO *pItmp = sk_X509_INFO_value(pInfo,i);
        if(pItmp->x509){
            X509_STORE_add_cert(pCts,pItmp->x509);
        }
        if(pItmp->crl){
            X509_STORE_add_crl(pCts,pItmp->crl);
        }
    }

    sk_X509_INFO_pop_free(pInfo,X509_INFO_free);
    BIO_free(cbio);

    rv = CURLE_OK;
    return rv;
}

int test_cacertinmem(){
    CURL *ch;
    CURLcode rv;

    curl_global_init(CURL_GLOBAL_ALL);
    ch = curl_easy_init();
    curl_easy_setopt(ch,CURLOPT_VERBOSE,0L);
    curl_easy_setopt(ch,CURLOPT_HEADER,0L);
    curl_easy_setopt(ch,CURLOPT_NOPROGRESS,0L);
    curl_easy_setopt(ch,CURLOPT_NOSIGNAL,1L);
    curl_easy_setopt(ch,CURLOPT_WRITEFUNCTION,writefunction);
    curl_easy_setopt(ch,CURLOPT_WRITEDATA,stdout);
    curl_easy_setopt(ch,CURLOPT_HEADERFUNCTION,*writefunction);
    curl_easy_setopt(ch,CURLOPT_HEADERDATA,stderr);
    curl_easy_setopt(ch,CURLOPT_SSLCERTTYPE,"PEM");
    curl_easy_setopt(ch,CURLOPT_SSL_VERIFYPEER,1L);
    curl_easy_setopt(ch,CURLOPT_URL,"https://www.example.com/");

    //turn off the default CA locations,otherswise libcurl will load CA certificates from the locations that were detected /specified at build-time
    curl_easy_setopt(ch,CURLOPT_CAINFO,NULL);
    curl_easy_setopt(ch,CURLOPT_CAPATH,NULL);

    //first try: retrieve page without ca certificates-> should fail unless libcurl was buiilt  --with-ca-fallback enabeld at build-time
    rv = curl_easy_perform(ch);
    if(CURLE_OK == rv){
        printf("*** transfer succeeded ***\n");
    }else{
       printf("***transfer failed***\n");
    }

    /**use a fresh connection (optional)
     * this option seriously impacts performance of multiple transfers but
     * it is necessary order to demonstrate this example .recall that the ssl ctx callback is oly called _before_ an SSL connection is established, therefore it will not
     * affect existing verified SSL connections already in the connection cache associated with this handle. normally your would set the ssl ctx function before making any transfers,and not
     * use this option.
    **/
    curl_easy_setopt(ch,CURLOPT_FRESH_CONNECT,1L);
   /**second try: retrieve page using cacert's certificate -> will succedd
    * load the certificate by installing a frunction doing the necessary
    * 'modifications' to the SSL CONTEXT just before link init
    **/

    curl_easy_setopt(ch,CURLOPT_SSL_CTX_FUNCTION,sslctx_function);
    rv  = curl_easy_perform(ch);
    if(CURLE_OK == rv){
        printf("*** transfer succeeded ***\n");
    }else{
        printf("*** transfer failed***\n");
    }
    curl_easy_cleanup(ch);
    curl_global_cleanup();
    return rv;

}


#endif // LIBCURL_CACERTINMEM_HPP

庫文件鏈接

/3rd/sdk/x86/libcurl/lib  -lcurl

LIBS += -L /usr/lib/x86_64-linux-gnu -lssl -lcrypto

不做如上配置則會報錯如下

g++  -o test_libcurl_rtsp main.o   -L/home/damon/dev/3rd/sdk/x86/libcurl/lib -lcurl   
/usr/bin/ld: main.o: undefined reference to symbol 'SSL_CTX_get_cert_store@@OPENSSL_1_1_0'
/usr/bin/ld: /lib/x86_64-linux-gnu/libssl.so.1.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make: *** [Makefile:276: test_libcurl_rtsp] Error 1
20:20:07: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project test_libcurl_rtsp (kit: Desktop Qt 5.14.2 GCC 64bit)
When executing step "Make"
20:20:07: Elapsed time: 00:00.

執行報錯

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
***transfer failed***
*** transfer failed***
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