Test libmosquitto SSL against howsmyssl.com

compiling

cd mosquitto/lib
cp somewhere/hows.c .
gcc hows.c net_mosq.c logging_mosq.c memory_mosq.c messages_mosq.c mosquitto.c read_handle.c read_handle_client.c read_handle_shared.c send_mosq.c send_client_mosq.c time_mosq.c tls_mosq.c util_mosq.c will_mosq.c -I. -I.. -DWITH_TLS -lrt -lssl -lcrypto -o hows
./hows

hows.c

#include <sys/select.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include "mosquitto.h"
#include "mosquitto_internal.h"
#include "net_mosq.h"

int main(int argc, char *argv[])
{
    struct mosquitto *mosq;
    int sock;
    char outbuf[1024];
    char inbuf[4096];
    int pos = 0;
    int olen, len;
    struct timeval timeout;
    fd_set readfds, writefds;
    int fdcount;

    mosquitto_lib_init();

    mosq = mosquitto_new(NULL, 1, NULL);
    mosq->tls_insecure = true;
    mosquitto_tls_set(mosq, NULL, "/etc/ssl/certs", NULL, NULL, NULL);
    _mosquitto_socket_connect(mosq, "www.howsmyssl.com", 443, NULL, true);

    snprintf(outbuf, 1024, "GET https://www.howsmyssl.com/a/check HTTP/1.1\n\n");
    olen = strlen(outbuf);

    while(1){
        FD_ZERO(&readfds);
        FD_SET(mosq->sock, &readfds);
        FD_ZERO(&writefds);
        if(pos+1 < olen){
            FD_SET(mosq->sock, &writefds);
        }
        timeout.tv_sec = 1;
        timeout.tv_usec = 0;

        fdcount = select(mosq->sock+1, &readfds, &writefds, NULL, &timeout);

        if(fdcount <= 0){
            return 1;
        }else{
            if(FD_ISSET(mosq->sock, &readfds)){
                memset(inbuf, 0, 4096);
                len = _mosquitto_net_read(mosq, inbuf, 4096);
                if(len > 0){
                    printf("%s", inbuf);
                    fflush(stdout);
                }else if(pos == olen && len == 0){
                    return 0;
                }
            }
            if(FD_ISSET(mosq->sock, &writefds)){
                if(pos < olen){
                    len = _mosquitto_net_write(mosq, &outbuf[pos], strlen(outbuf)-pos);
                    if(len > 0){
                        pos += len;
                    }
                }
            }
        }
    }

    return 0;
}