Maybe my original question is to broad. I guess I will
just describe a path that i headed down and hopefully
get some input as to if it is the best way to go. Any
input would be greatly appreciated.
The problem is that I need to create a typical I/O
callback for OpenSSL. During the handshake I have a
pointer to a read and write function, and during
normal data transfer, I have a pointer to a buffer and
len that i can read from and write from. So, in trying
to solve this problem, here is what i have come up
with.
First, i created my own sink objects (for brevity, i
have listed only one, but in reality, i will have a
foo object for the handshake and a bar object for
encrypted data transfers - see code below).
#define BIO_TYPE_FOO (46|0x0400|0x0100)
BIO_METHOD * BIO_s_foo(void) {
return (&methods_foo);
}
BIO_METHOD methods_foo ={
BIO_TYPE_FOO, "foo",
foo_write, foo_read, NULL, NULL,
foo_ctrl, foo_new, foo_free, NULL };
int foo_read(...) { reading by using the funkyCtx set
in ctrl() }
int foo_write(...) { same as write }
int foo_ctrl(...) { setting my funkyCtx with
BIO_C_SET_FD )
int foo_new(...) { allocating space for my funkyCtx }
int foo_free(...)
The interesting function is the ctrl function that I
enable the passing
of my special context when i create the method (much
like you pass a socket
into a BIO_s_socket() method).
So, then, I can make the following calls:
FOO_CTX *funkyFooCtx = (pointer to all of my needed
i/o info);
FOO_CTX *funkyBarCtx = (pointer to all of my needed
i/o info);
BIO * fooBio = BIO_new(BIO_s_foo());
BIO * barBio = BIO_new(BIO_s_bar());
BIO_set_fd(fooBio, funkyFooCtx, close_flag);
BIO_set_fd(barBio, funkyBarCtx, close_flag);
SSL_set_bio(conn, fooBio, fooBio);
SSL_accept(conn);
SSL_set_bio(conn, barBio, barBio);
SSL_read(conn, ..., ...);
SSL_write(conn, ..., ...);
Does this make sense, or is there some easier way to
do this that i am just not seeing?
Thank you for any help,
-z
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