Hello All,
I had written a simple client earlier which did a blocking read and
was able to retrieve the document from the server. Now, I am trying to
rewrite the code to do non-blocking read. But only part of the data is
showing. Can someone please show what's wrong? I am eliminating
variable declarations, error checks and includes to keep this short.
TIA
int main(int argc, char **argv) {
char request[] = "GET / HTTP/1.0\x0D\x0AHost:
www.google.com\x0D\x0A\x0D\x0A";
char response[4096];
char host[] = "www.google.com";
/* Set up the library */
SSL_library_init();
ERR_load_BIO_strings();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
/* Set up the SSL context */
ctx = SSL_CTX_new(SSLv23_client_method());
/* Load the trust store */
SSL_CTX_load_verify_locations(ctx, "mycert.pem", NULL);
/* Connect the TCP socket*/
hp = gethostbyname(host);
memset(&addr,0,sizeof(addr));
addr.sin_addr = *(struct in_addr*)hp->h_addr_list[0];
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
sock=socket(AF_INET,SOCK_STREAM, IPPROTO_TCP);
connect(sock,(struct sockaddr *)&addr, sizeof(addr));
/* Connect the SSL socket */
ssl = SSL_new(ctx);
sbio = BIO_new_socket(sock,BIO_NOCLOSE);
SSL_set_bio(ssl,sbio,sbio);
if(SSL_connect(ssl) <= 0) {
perror(NULL);
return 0;
}
/* Now make our HTTP request */
res = SSL_write(ssl,request,strlen(request));
switch(SSL_get_error(ssl,res)){
case SSL_ERROR_NONE:
write_complete = 1;
break;
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_READ:
/* Bit confused by what to do. */
default:
break;
}
if (!write_complete)
goto cleanup;
/* Add socket descriptor to epoll. */
s_epfd = epoll_create(EPOLL_INIT_SIZE);
ev.events = EPOLLIN;
ev.data.fd = sock;
res = epoll_ctl(s_epfd, EPOLL_CTL_ADD, sock, &ev);
num_fd = epoll_wait(s_epfd, events, MAXEVENTS, -1);
if (num_fd > 0) {
for (i=0; i<num_fd; i++) {
if ((events[i].events & EPOLLIN) && (events[i].data.fd
== sock)) {
/* HTTPS server has responded. */
do {
read_blocked_on_write = 0;
read_blocked = 0;
memset(response, 0, 4096);
res = SSL_read(ssl, response, 4096);
read_blocked = 0;
switch(SSL_get_error(ssl,res)) {
case SSL_ERROR_NONE:
printf("%s\n",
response);
break;
case SSL_ERROR_ZERO_RETURN:
/* End of data */
SSL_shutdown(ssl);
goto cleanup;
break;
case SSL_ERROR_WANT_READ:
read_blocked=1;
break;
case SSL_ERROR_WANT_WRITE:
goto cleanup;
break;
default:
goto cleanup;
}
} while (SSL_pending(ssl) && !read_blocked);
}
}
}
cleanup:
SSL_free(ssl);
SSL_CTX_free(ctx);
close(sock);
exit(0);
}
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