minix3/lib/libc/sys/getpeername.c

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2020-02-21 00:59:27 +05:30
#include <sys/cdefs.h>
#include "namespace.h"
#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>
#include <sys/un.h>
#define DEBUG 0
static int _tcp_getpeername(int sock, struct sockaddr *__restrict address,
socklen_t *__restrict address_len, nwio_tcpconf_t *tcpconfp);
static int _udp_getpeername(int sock, struct sockaddr *__restrict address,
socklen_t *__restrict address_len, nwio_udpopt_t *tcpconfp);
static int _uds_getpeername(int sock, struct sockaddr *__restrict address,
socklen_t *__restrict address_len, struct sockaddr_un *uds_addr);
int getpeername(int sock, struct sockaddr *__restrict address,
socklen_t *__restrict address_len)
{
int r;
nwio_tcpconf_t tcpconf;
nwio_udpopt_t udpopt;
struct sockaddr_un uds_addr;
r= ioctl(sock, NWIOGTCPCONF, &tcpconf);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _tcp_getpeername(sock, address, address_len,
&tcpconf);
}
r= ioctl(sock, NWIOGUDPOPT, &udpopt);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _udp_getpeername(sock, address, address_len,
&udpopt);
}
r= ioctl(sock, NWIOGUDSPADDR, &uds_addr);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _uds_getpeername(sock, address, address_len,
&uds_addr);
}
#if DEBUG
fprintf(stderr, "getpeername: not implemented for fd %d\n", sock);
#endif
errno= ENOSYS;
return -1;
}
static int _tcp_getpeername(int sock, 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;
sin.sin_len = sizeof(sin);
len= *address_len;
if (len > sizeof(sin))
len= sizeof(sin);
memcpy(address, &sin, len);
*address_len= len;
return 0;
}
static int _udp_getpeername(int sock, struct sockaddr *__restrict address,
socklen_t *__restrict address_len, nwio_udpopt_t *udpopt)
{
socklen_t len;
struct sockaddr_in sin;
if (udpopt->nwuo_remaddr == 0 ||
udpopt->nwuo_remport == 0)
{
errno= ENOTCONN;
return -1;
}
memset(&sin, '\0', sizeof(sin));
sin.sin_family= AF_INET;
sin.sin_addr.s_addr= udpopt->nwuo_remaddr;
sin.sin_port= udpopt->nwuo_remport;
sin.sin_len = sizeof(sin);
len= *address_len;
if (len > sizeof(sin))
len= sizeof(sin);
memcpy(address, &sin, len);
*address_len= len;
return 0;
}
static int _uds_getpeername(int sock, struct sockaddr *__restrict address,
socklen_t *__restrict address_len, struct sockaddr_un *uds_addr)
{
socklen_t len;
if (uds_addr->sun_family != AF_UNIX)
{
errno= ENOTCONN;
return -1;
}
len= *address_len;
if (len > sizeof(struct sockaddr_un))
len = sizeof(struct sockaddr_un);
memcpy(address, uds_addr, len);
*address_len= len;
return 0;
}