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Old 08-20-2010
Question Puzzle about sctp_bindx in UNP
It writes in Section 9.3 in Unix Network programming about SCTP:
"The sctp_bindx call can be used on a bound or unbound socket."
And then it writes:
"The port number in all the socket address structures must be the same and must match any port number that is already bound; if it doesn't, then sctp_bindx will fail, returning the error code EINVAL."

It is easy to understand that the port number must be the same. What confuses me is that the port number must match any port number that is already bound. But previously it says that the sctp_bindx can be used on a unbound socket. I think that if the socket is unbound, the port number the socket will use must be unused as well. For example, assuming that a SCTP server wants to use port 123 to receive requests, the unbound SCTP socket will call sctp_bindx to bind itself to the port 123. Can it be done?
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LEARN ABOUT FREEBSD

sctp_bindx

SCTP_BINDX(3)						   BSD Library Functions Manual 					     SCTP_BINDX(3)

NAME

     sctp_bindx -- bind or unbind an SCTP socket to a list of addresses.

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <sys/socket.h>
     #include <netinet/sctp.h>

     int
     sctp_bindx(int s, struct sockaddr *addrs, int num, int type);

DESCRIPTION

     The sctp_bindx() call binds or unbinds a address or a list of addresses to an SCTP endpoint.  This allows a user to bind a subset of
     addresses.  The sctp_bindx() call operates similarly to bind() but allows a list of addresses and also allows a bind or an unbind.  The argu-
     ment s must be a valid SCTP socket descriptor.  The argument addrs is a list of addresses (where the list may be only 1 in length) that the
     user wishes to bind or unbind to the socket.  The argument type must be one of the following values.

     SCTP_BINDX_ADD_ADDR This value indicates that the listed address(es) need to be added to the endpoint.

     SCTP_BINDX_DEL_ADDR This value indicates that the listed address(es) need to be removed from the endpoint.

     Note that when a user adds or deletes an address to an association if the dynamic address flag net.inet.sctp.auto_asconf is enabled any asso-
     ciations in the endpoint will attempt to have the address(es) added dynamically to the existing association.

RETURN VALUES

     The call returns 0 on success and -1 upon failure.

ERRORS

     The sctp_bindx() function can return the following errors:

     [EINVAL]		This value is returned if the type field is not one of the allowed values (see above).

     [ENOMEM]		This value is returned if the number of addresses being added causes a memory allocation failure in the call.

     [EBADF]		The argument s is not a valid descriptor.

     [ENOTSOCK] 	The argument s is not a socket.

SEE ALSO

     bind(2), sctp(4)

BSD
								 December 15, 2006							       BSD