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glibc/sysdeps/mach/hurd/if_index.c
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/* Find network interface names and index numbers. Hurd version. | |
Copyright (C) 2000-2014 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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <error.h> | |
#include <net/if.h> | |
#include <string.h> | |
#include <sys/ioctl.h> | |
#include <unistd.h> | |
#include <hurd.h> | |
#include <hurd/ioctl.h> | |
#include <hurd/pfinet.h> | |
/* Return the interface index corresponding to interface IFNAME. | |
On error, return 0. */ | |
unsigned int | |
__if_nametoindex (const char *ifname) | |
{ | |
struct ifreq ifr; | |
int fd = __opensock (); | |
if (fd < 0) | |
return 0; | |
strncpy (ifr.ifr_name, ifname, IFNAMSIZ); | |
if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0) | |
{ | |
int saved_errno = errno; | |
__close (fd); | |
if (saved_errno == EINVAL || saved_errno == ENOTTY) | |
__set_errno (ENOSYS); | |
return 0; | |
} | |
__close (fd); | |
return ifr.ifr_ifindex; | |
} | |
libc_hidden_def (__if_nametoindex) | |
weak_alias (__if_nametoindex, if_nametoindex) | |
libc_hidden_weak (if_nametoindex) | |
/* Free the structure IFN returned by if_nameindex. */ | |
void | |
__if_freenameindex (struct if_nameindex *ifn) | |
{ | |
struct if_nameindex *ptr = ifn; | |
while (ptr->if_name || ptr->if_index) | |
{ | |
free (ptr->if_name); | |
++ptr; | |
} | |
free (ifn); | |
} | |
weak_alias (__if_freenameindex, if_freenameindex) | |
/* Return an array of if_nameindex structures, one for each network | |
interface present, plus one indicating the end of the array. On | |
error, return NULL. */ | |
struct if_nameindex * | |
__if_nameindex (void) | |
{ | |
error_t err = 0; | |
char data[2048]; | |
file_t server; | |
int fd = __opensock (); | |
struct ifconf ifc; | |
unsigned int nifs, i; | |
struct if_nameindex *idx = NULL; | |
ifc.ifc_buf = data; | |
if (fd < 0) | |
return NULL; | |
server = _hurd_socket_server (PF_INET, 0); | |
if (server == MACH_PORT_NULL) | |
nifs = 0; | |
else | |
{ | |
size_t len = sizeof data; | |
err = __pfinet_siocgifconf (server, -1, &ifc.ifc_buf, &len); | |
if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED) | |
{ | |
/* On the first use of the socket server during the operation, | |
allow for the old server port dying. */ | |
server = _hurd_socket_server (PF_INET, 1); | |
if (server == MACH_PORT_NULL) | |
goto out; | |
err = __pfinet_siocgifconf (server, -1, &ifc.ifc_buf, &len); | |
} | |
if (err) | |
goto out; | |
ifc.ifc_len = len; | |
nifs = len / sizeof (struct ifreq); | |
} | |
idx = malloc ((nifs + 1) * sizeof (struct if_nameindex)); | |
if (idx == NULL) | |
{ | |
err = ENOBUFS; | |
goto out; | |
} | |
for (i = 0; i < nifs; ++i) | |
{ | |
struct ifreq *ifr = &ifc.ifc_req[i]; | |
idx[i].if_name = __strdup (ifr->ifr_name); | |
if (idx[i].if_name == NULL | |
|| __ioctl (fd, SIOCGIFINDEX, ifr) < 0) | |
{ | |
unsigned int j; | |
err = errno; | |
for (j = 0; j < i; ++j) | |
free (idx[j].if_name); | |
free (idx); | |
idx = NULL; | |
if (err == EINVAL) | |
err = ENOSYS; | |
else if (err == ENOMEM) | |
err = ENOBUFS; | |
goto out; | |
} | |
idx[i].if_index = ifr->ifr_ifindex; | |
} | |
idx[i].if_index = 0; | |
idx[i].if_name = NULL; | |
out: | |
__close (fd); | |
if (data != ifc.ifc_buf) | |
__vm_deallocate (__mach_task_self (), (vm_address_t) ifc.ifc_buf, | |
ifc.ifc_len); | |
__set_errno (err); | |
return idx; | |
} | |
weak_alias (__if_nameindex, if_nameindex) | |
/* Store the name of the interface corresponding to index IFINDEX in | |
IFNAME (which has space for at least IFNAMSIZ characters). Return | |
IFNAME, or NULL on error. */ | |
char * | |
__if_indextoname (unsigned int ifindex, char *ifname) | |
{ | |
struct ifreq ifr; | |
int fd = __opensock (); | |
if (fd < 0) | |
return NULL; | |
ifr.ifr_ifindex = ifindex; | |
if (__ioctl (fd, SIOCGIFNAME, &ifr) < 0) | |
{ | |
int saved_errno = errno; | |
__close (fd); | |
if (saved_errno == EINVAL || saved_errno == ENOTTY) | |
__set_errno (ENOSYS); | |
else if (saved_errno == ENODEV) | |
__set_errno (ENXIO); | |
return NULL; | |
} | |
__close (fd); | |
return strncpy (ifname, ifr.ifr_name, IFNAMSIZ); | |
} | |
weak_alias (__if_indextoname, if_indextoname) | |
libc_hidden_weak (if_indextoname) | |
#if 0 | |
void | |
internal_function | |
__protocol_available (int *have_inet, int *have_inet6) | |
{ | |
*have_inet = _hurd_socket_server (PF_INET, 0) != MACH_PORT_NULL; | |
*have_inet6 = _hurd_socket_server (PF_INET6, 0) != MACH_PORT_NULL; | |
} | |
#endif |