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/* Copyright (C) 1992-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/socket.h>
/* Put the address of the peer connected to socket FD into *ADDR
(which is *LEN bytes long), and its actual length into *LEN. */
int
__getpeername (int fd, __SOCKADDR_ARG addrarg, socklen_t *len)
{
error_t err;
mach_msg_type_number_t buflen = *len;
int type;
struct sockaddr *addr = addrarg.__sockaddr__;
char *buf = (char *) addr;
addr_port_t aport;
if (err = HURD_DPORT_USE (fd, __socket_peername (port, &aport)))
return __hurd_dfail (fd, err);
err = __socket_whatis_address (aport, &type, &buf, &buflen);
__mach_port_deallocate (__mach_task_self (), aport);
if (err)
return __hurd_dfail (fd, err);
if (*len > buflen)
*len = buflen;
if (buf != (char *) addr)
{
memcpy (addr, buf, *len);
__vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
}
const sa_family_t family = type;
if (*len > offsetof (struct sockaddr, sa_family))
{
if (*len < (char *) (&addr->sa_family + 1) - (char *) addr)
memcpy (&addr->sa_family, &family,
*len - offsetof (struct sockaddr, sa_family));
else
addr->sa_family = family;
}
return 0;
}
weak_alias (__getpeername, getpeername)
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