On 8/11/05, David Schwartz <[EMAIL PROTECTED]> wrote:
<snip>
> > My code uses blocking sockets, has the SSL_CTX
> > SSL_MODE_ENABLE_PARTIAL_WRITE option set and loops on the ssl_read but
> > the socket is closed after the first 32k is sent.
> >
> > Why, if a message block size is 16k, does the first 32k of a message
> > get written/read, then the socket dropped?
<snip>
> Give us example code or more detailed information about what you mean
> by
> "the socket dropped" and how you determined that.
> My bet is simply that there's a bug in your code. With non-blocking
> sockets, you have to test the return value of SSL_read and properly handle
> partial or failed sends. You may get a failed send if there was insufficient
> space to fit a single block of protocol data (or if protocol data was sent
> that corresponds to zero bytes of application data!). You may get a partial
> send.
Thanks for your reply David - I think you're probably right about my code! ;-)
Upon your suggestion I added some more cases to test the return code
of ssl_write and found that I am getting a SSL_ERROR_SYSCALL after the
first 32 bytes.
Here is is the code. As mentioned before, I have the SSL_CTX set with
partial writes enabled, the main write loop is as follows (for
clarity,I've removed all the tests of ssl_write other than those that
get called).
--start------------
char error_str[BUFF_SIZE]
char out_buf[BUFFSIZE];
int sent_bytes=0;
int offset=0;
int bytes_to_send = <length of data in out_buf>
fprintf(stderr, "- Attempting to write %d bytes\n", bytes_to_send);
while(bytes_to_send){
sent_bytes = SSL_write(p_ssl, out_buf+offset, bytes_to_send);
switch(SSL_get_error(p_ssl, sent_bytes)) {
case SSL_ERROR_NONE:
bytes_to_send -= sent_bytes;
offset += sent_bytes;
fprintf(stderr, "- Written %d bytes\n", sent_bytes);
break;
case SSL_ERROR_SYSCALL:
error_str = Err_error_string(Err_get_error());
fprintf(stderr, "- SSL_ERROR_SYSCALL: %s\n", error_str);
return false; // exit routine
default:
fprintf(stderr, "- SSL_write reports %d\n", sent_bytes);
return false; // exit routine
}
}
--end--------------
When I try and write more than 32k I get the following messages...
- Attempting to write 59266 bytes
- Written 16384 bytes
- Written 16384 bytes
- SSL_ERROR_SYSCALL: error:00000000:lib(0):func(0):reason(0)
I have SSL_load_error_strings() earlier in my code, but don't get any
more information than this.
I'm still at a loss as to whats happening here, but many thanks for
your help in getting this far.
Michael.
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