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Full Discussion: Can't I Cast sockaddr to sockaddr_in?!
Top Forums Programming Can't I Cast sockaddr to sockaddr_in?! Post 302253502 by f.ben.isaac on Friday 31st of October 2008 07:38:25 PM
Old 10-31-2008
Can't I Cast sockaddr to sockaddr_in?!
I'm trying to grab client's port number, by doing the following code:

Code:
//get client's port number - here we are not dealing with pointers
//because the returned value will be passed as a parameter to htons()
//htons() takes u_short, which is similar to short, parameter
short get_client_port(struct sockaddr clientInformation)
{
    //carries the port number that client connected from
    short portNumber;
    
    //check the family version of client IP address, so you
    //can know where to cast, either to sockaddr_in or sockaddr_in6
    //and then grab the port after casting
    if (clientInformation.sa_family == AF_INET) {
        struct sockaddr_in ipv4 = (struct sockaddr_in)clientInformation;
        portNumber = ipv4.sin_port;
        return portNumber;
    }else{
        struct sockaddr_in6 ipv6 = (struct sockaddr_in6)clientInformation;
        portNumber = ipv6.sin6_port;
        return portNumber;
       }
}

In some point i did this:

Code:
short portNum =  get_client_port(clientInfo);
short portHostByte = ntohs(portNum);
//put portHostByte in a printf()

Why do i get the following errors?

Code:
echo_server.cpp: In function ‘short int get_client_port(sockaddr)':
echo_server.cpp:53: error: no matching function for call to ‘sockaddr_in::sockaddr_in(sockaddr&)'
/usr/include/netinet/in.h:218: note: candidates are: sockaddr_in::sockaddr_in()
/usr/include/netinet/in.h:218: note:                 sockaddr_in::sockaddr_in(const sockaddr_in&)
echo_server.cpp:57: error: no matching function for call to ‘sockaddr_in6::sockaddr_in6(sockaddr&)'
/usr/include/netinet/in.h:232: note: candidates are: sockaddr_in6::sockaddr_in6()
/usr/include/netinet/in.h:232: note:                 sockaddr_in6::sockaddr_in6(const sockaddr_in6&)

Any idea?
 

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LEARN ABOUT OPENSOLARIS

sctp_getpaddrs

sctp_getpaddrs(3SOCKET) 				     Sockets Library Functions					   sctp_getpaddrs(3SOCKET)

NAME

       sctp_getpaddrs, sctp_freepaddrs - returns all peer addresses on an SCTP association

SYNOPSIS

       cc [ flag... ] file... -lsocket	-lnsl	-lsctp	[ library... ]
       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/sctp.h>

       int sctp_getpaddrs(int sock, sctp_assoc_t id, void **addrs);

       void sctp_freepaddrs(void *addrs);

DESCRIPTION

       The  sctp_getpaddrs()  queries  the peer addresses in an SCTP association. The sctp_freepaddrs() function releases resources that are allo-
       cated to hold the addresses.

       The sctp_getpaddrs() function returns all the peer addresses in the SCTP association identified by sock. On completion addrs  points  to  a
       dynamically  allocated array of sockaddr_in structures for an Internet Protocol (IPv4) socket or an array of sockaddr_in6 structures for an
       Internet Protocol Version 6 (IPv6) socket. The addrs parameter must not be NULL. For an IPv4 SCTP socket, the  addresses  returned  in  the
       sockaddr_in  structures	are IPv4 addresses. For an IPv6 SCTP socket, the addresses in the sockaddr_in6 structures can be IPv6 addresses or
       IPv4-mapped IPv6 addresses.

       If sock is a one-to-many style SCTP socket, id specifies the association of interest. If sock is a one-to-one  style  SCTP  socket,  id	is
       ignored.

       The  sctp_freepaddrs()  function frees the resources allocated by sctp_getpaddrs(). The addrs parameter is the array of addresses allocated
       by sctp_getpaddrs().

RETURN VALUES

       Upon successful completion, the sctp_getpaddrs() function returns the number of addresses in  the  addrs  array.  Otherwise,  the  function
       returns -1 and sets errno to indicate the error.

ERRORS

       The sctp_getpaddrs() succeeds unless one of the following conditions exist.

       EBADF	   The sock argument is an invalid file descriptor.

       ENOTSOCK    The sock argument is not a socket.

       EINVAL	   The addrs argument is NULL.

       EINVAL	   The id argument is an invalid association identifier for a one-to-many style STP socket.

       ENOTCONN    The specified socket is not connected.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       bind(3SOCKET),  in.h(3HEAD),  libsctp(3LIB),  sctp_freeladdrs(3SOCKET),	sctp_getladdrs(3SOCKET), socket(3SOCKET), attributes(5), inet(7P),
       inet6(7P), ip(7P), ip6(7P), sctp(7P)

SunOS 5.11							    23 Jan 2008 					   sctp_getpaddrs(3SOCKET)
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