source: trunk/minix/lib/ip/getpeername.c@ 11

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_io.h>

#define DEBUG 0

static int _tcp_getpeername(int socket, struct sockaddr *_RESTRICT address,
        socklen_t *_RESTRICT address_len, nwio_tcpconf_t *tcpconfp);

int getpeername(int socket, struct sockaddr *_RESTRICT address,
        socklen_t *_RESTRICT address_len)
{
        int r;
        nwio_tcpconf_t tcpconf;

        r= ioctl(socket, NWIOGTCPCONF, &tcpconf);
        if (r != -1 || errno != ENOTTY)
        {
                if (r == -1)
                {
                        /* Bad file descriptor */
                        return -1;
                }
                return _tcp_getpeername(socket, address, address_len,
                        &tcpconf);
        }

#if DEBUG
        fprintf(stderr, "getpeername: not implemented for fd %d\n", socket);
#endif
        errno= ENOSYS;
        return -1;
}

static int _tcp_getpeername(int socket, struct sockaddr *_RESTRICT address,
        socklen_t *_RESTRICT address_len, nwio_tcpconf_t *tcpconfp)
{
        socklen_t len;
        struct sockaddr_in sin;

        if (tcpconfp->nwtc_remaddr == 0 ||
                tcpconfp->nwtc_remport == 0)
        {
                errno= ENOTCONN;
                return -1;
        }

        memset(&sin, '\0', sizeof(sin));
        sin.sin_family= AF_INET;
        sin.sin_addr.s_addr= tcpconfp->nwtc_remaddr;
        sin.sin_port= tcpconfp->nwtc_remport;

        len= *address_len;
        if (len > sizeof(sin))
                len= sizeof(sin);
        memcpy(address, &sin, len);
        *address_len= len;

        return 0;
}