BIO_s_accept (3)

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NAME

BIO_s_accept, BIO_set_accept_port, BIO_get_accept_port, BIO_new_accept, BIO_set_nbio_accept, BIO_set_accept_bios, BIO_set_bind_mode, BIO_get_bind_mode, BIO_do_accept - accept BIO

SYNOPSIS

 #include <openssl/bio.h>

 BIO_METHOD *BIO_s_accept(void);

 long BIO_set_accept_port(BIO *b, char *name);
 char *BIO_get_accept_port(BIO *b);

 BIO *BIO_new_accept(char *host_port);

 long BIO_set_nbio_accept(BIO *b, int n);
 long BIO_set_accept_bios(BIO *b, char *bio);

 long BIO_set_bind_mode(BIO *b, long mode);
 long BIO_get_bind_mode(BIO *b, long dummy);

 #define BIO_BIND_NORMAL                0
 #define BIO_BIND_REUSEADDR_IF_UNUSED   1
 #define BIO_BIND_REUSEADDR             2

 int BIO_do_accept(BIO *b);

DESCRIPTION

BIO_s_accept() returns the accept method. This is a wrapper round the platform's socket accept routines.

Using accept BIOs,

connections can be accepted and data transferred using only routines. In this way any platform specific operations are hidden by the abstraction.

Read and write operations on an accept

will perform I/O on the underlying connection. If no connection is established and the port (see below) is set up properly then the waits for an incoming connection.

Accept BIOs support BIO_puts() but not BIO_gets().

If the close flag is set on an accept

then any active connection on that chain is shutdown and the socket closed when the is freed.

Calling BIO_reset() on a accept

will close any active connection and reset the into a state where it awaits another incoming connection.

BIO_get_fd() and BIO_set_fd() can be called to retrieve or set the accept socket. See BIO_s_fd(3)

BIO_set_accept_port() uses the string name to set the accept port. The port is represented as a string of the form ``host:port'', where ``host'' is the interface to use and ``port'' is the port. The host can be can be ``*'' which is interpreted as meaning any interface; ``port'' has the same syntax as the port specified in BIO_set_conn_port() for connect BIOs, that is it can be a numerical port string or a string to lookup using getservbyname() and a string table.

BIO_new_accept() combines BIO_new() and BIO_set_accept_port() into a single call: that is it creates a new accept

with port host_port.

BIO_set_nbio_accept() sets the accept socket to blocking mode (the default) if n is 0 or non blocking mode if n is 1.

BIO_set_accept_bios() can be used to set a chain of BIOs which will be duplicated and prepended to the chain when an incoming connection is received. This is useful if, for example, a buffering or

is required for each connection. The chain of BIOs must not be freed after this call, they will be automatically freed when the accept is freed.

BIO_set_bind_mode() and BIO_get_bind_mode() set and retrieve the current bind mode. If

(the default) is set then another socket cannot be bound to the same port. If is set then other sockets can bind to the same port. If is set then and attempt is first made to use if this fails and the port is not in use then a second attempt is made using

BIO_do_accept() serves two functions. When it is first called, after the accept

has been setup, it will attempt to create the accept socket and bind an address to it. Second and subsequent calls to BIO_do_accept() will await an incoming connection, or request a retry in non blocking mode.

NOTES

When an accept is at the end of a chain it will await an incoming connection before processing I/O calls. When an accept is not at then end of a chain it passes I/O calls to the next in the chain.

When a connection is established a new socket

is created for the connection and appended to the chain. That is the chain is now accept->socket. This effectively means that attempting I/O on an initial accept socket will await an incoming connection then perform I/O on it.

If any additional BIOs have been set using BIO_set_accept_bios() then they are placed between the socket and the accept

that is the chain will be accept->otherbios->socket.

If a server wishes to process multiple connections (as is normally the case) then the accept

must be made available for further incoming connections. This can be done by waiting for a connection and then calling:

 connection = BIO_pop(accept);

After this call connection will contain a

for the recently established connection and accept will now be a single again which can be used to await further incoming connections. If no further connections will be accepted the accept can be freed using BIO_free().

If only a single connection will be processed it is possible to perform I/O using the accept

itself. This is often undesirable however because the accept will still accept additional incoming connections. This can be resolved by using BIO_pop() (see above) and freeing up the accept after the initial connection.

If the underlying accept socket is non-blocking and BIO_do_accept() is called to await an incoming connection it is possible for BIO_should_io_special() with the reason

If this happens then it is an indication that an accept attempt would block: the application should take appropriate action to wait until the underlying socket has accepted a connection and retry the call.

BIO_set_accept_port(), BIO_get_accept_port(), BIO_set_nbio_accept(), BIO_set_accept_bios(), BIO_set_bind_mode(), BIO_get_bind_mode() and BIO_do_accept() are macros.

RETURN VALUES

EXAMPLE

This example accepts two connections on port 4444, sends messages down each and finally closes both down.

 BIO *abio, *cbio, *cbio2;
 ERR_load_crypto_strings();
 abio = BIO_new_accept("4444");

 /* First call to BIO_accept() sets up accept BIO */
 if(BIO_do_accept(abio) <= 0) {
        fprintf(stderr, "Error setting up accept\n");
        ERR_print_errors_fp(stderr);
        exit(0);                
 }

 /* Wait for incoming connection */
 if(BIO_do_accept(abio) <= 0) {
        fprintf(stderr, "Error accepting connection\n");
        ERR_print_errors_fp(stderr);
        exit(0);                
 }
 fprintf(stderr, "Connection 1 established\n");
 /* Retrieve BIO for connection */
 cbio = BIO_pop(abio);
 BIO_puts(cbio, "Connection 1: Sending out Data on initial connection\n");
 fprintf(stderr, "Sent out data on connection 1\n");
 /* Wait for another connection */
 if(BIO_do_accept(abio) <= 0) {
        fprintf(stderr, "Error accepting connection\n");
        ERR_print_errors_fp(stderr);
        exit(0);                
 }
 fprintf(stderr, "Connection 2 established\n");
 /* Close accept BIO to refuse further connections */
 cbio2 = BIO_pop(abio);
 BIO_free(abio);
 BIO_puts(cbio2, "Connection 2: Sending out Data on second\n");
 fprintf(stderr, "Sent out data on connection 2\n");

 BIO_puts(cbio, "Connection 1: Second connection established\n");
 /* Close the two established connections */
 BIO_free(cbio);
 BIO_free(cbio2);

SEE ALSO