diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/if_index.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/if_index.c | 241 |
1 files changed, 0 insertions, 241 deletions
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c deleted file mode 100644 index 8ba5eae781..0000000000 --- a/sysdeps/unix/sysv/linux/if_index.c +++ /dev/null @@ -1,241 +0,0 @@ -/* Copyright (C) 1997-2017 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 <alloca.h> -#include <errno.h> -#include <string.h> -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <net/if.h> -#include <sys/socket.h> -#include <sys/ioctl.h> -#include <libc-lock.h> -#include <not-cancel.h> - -#include "netlinkaccess.h" - - -unsigned int -__if_nametoindex (const char *ifname) -{ -#ifndef SIOCGIFINDEX - __set_errno (ENOSYS); - return 0; -#else - struct ifreq ifr; - int fd = __opensock (); - - if (fd < 0) - return 0; - - strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); - if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0) - { - int saved_errno = errno; - close_not_cancel_no_status (fd); - if (saved_errno == EINVAL) - __set_errno (ENOSYS); - return 0; - } - close_not_cancel_no_status (fd); - return ifr.ifr_ifindex; -#endif -} -libc_hidden_def (__if_nametoindex) -weak_alias (__if_nametoindex, if_nametoindex) -libc_hidden_weak (if_nametoindex) - - -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); -} -libc_hidden_def (__if_freenameindex) -weak_alias (__if_freenameindex, if_freenameindex) -libc_hidden_weak (if_freenameindex) - - -static struct if_nameindex * -if_nameindex_netlink (void) -{ - struct netlink_handle nh = { 0, 0, 0, NULL, NULL }; - struct if_nameindex *idx = NULL; - - if (__netlink_open (&nh) < 0) - return NULL; - - - /* Tell the kernel that we wish to get a list of all - active interfaces. Collect all data for every interface. */ - if (__netlink_request (&nh, RTM_GETLINK) < 0) - goto exit_free; - - /* Count the interfaces. */ - unsigned int nifs = 0; - for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next) - { - struct nlmsghdr *nlh; - size_t size = nlp->size; - - if (nlp->nlh == NULL) - continue; - - /* Walk through all entries we got from the kernel and look, which - message type they contain. */ - for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size)) - { - /* Check if the message is what we want. */ - if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) - continue; - - if (nlh->nlmsg_type == NLMSG_DONE) - break; /* ok */ - - if (nlh->nlmsg_type == RTM_NEWLINK) - ++nifs; - } - } - - idx = malloc ((nifs + 1) * sizeof (struct if_nameindex)); - if (idx == NULL) - { - nomem: - __set_errno (ENOBUFS); - goto exit_free; - } - - /* Add the interfaces. */ - nifs = 0; - for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next) - { - struct nlmsghdr *nlh; - size_t size = nlp->size; - - if (nlp->nlh == NULL) - continue; - - /* Walk through all entries we got from the kernel and look, which - message type they contain. */ - for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size)) - { - /* Check if the message is what we want. */ - if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) - continue; - - if (nlh->nlmsg_type == NLMSG_DONE) - break; /* ok */ - - if (nlh->nlmsg_type == RTM_NEWLINK) - { - struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh); - struct rtattr *rta = IFLA_RTA (ifim); - size_t rtasize = IFLA_PAYLOAD (nlh); - - idx[nifs].if_index = ifim->ifi_index; - - while (RTA_OK (rta, rtasize)) - { - char *rta_data = RTA_DATA (rta); - size_t rta_payload = RTA_PAYLOAD (rta); - - if (rta->rta_type == IFLA_IFNAME) - { - idx[nifs].if_name = __strndup (rta_data, rta_payload); - if (idx[nifs].if_name == NULL) - { - idx[nifs].if_index = 0; - __if_freenameindex (idx); - idx = NULL; - goto nomem; - } - break; - } - - rta = RTA_NEXT (rta, rtasize); - } - - ++nifs; - } - } - } - - idx[nifs].if_index = 0; - idx[nifs].if_name = NULL; - - exit_free: - __netlink_free_handle (&nh); - __netlink_close (&nh); - - return idx; -} - - -struct if_nameindex * -__if_nameindex (void) -{ -#ifndef SIOCGIFINDEX - __set_errno (ENOSYS); - return NULL; -#else - struct if_nameindex *result = if_nameindex_netlink (); - return result; -#endif -} -weak_alias (__if_nameindex, if_nameindex) -libc_hidden_weak (if_nameindex) - - -char * -__if_indextoname (unsigned int ifindex, char *ifname) -{ - /* We may be able to do the conversion directly, rather than searching a - list. This ioctl is not present in kernels before version 2.1.50. */ - struct ifreq ifr; - int fd; - int status; - - fd = __opensock (); - - if (fd < 0) - return NULL; - - ifr.ifr_ifindex = ifindex; - status = __ioctl (fd, SIOCGIFNAME, &ifr); - - close_not_cancel_no_status (fd); - - if (status < 0) - { - if (errno == ENODEV) - /* POSIX requires ENXIO. */ - __set_errno (ENXIO); - - return NULL; - } - else - return strncpy (ifname, ifr.ifr_name, IFNAMSIZ); -} -weak_alias (__if_indextoname, if_indextoname) -libc_hidden_weak (if_indextoname) |