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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [inet/] [if_nametoindex.c] - Rev 1771
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/* Copyright (C) 1997,98,99,2000,02 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, write to the Free * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA * 02111-1307 USA. * * Reworked Dec 2002 by Erik Andersen <andersen@codepoet.org> */ #define __FORCE_GLIBC #include <features.h> #include <string.h> #include <errno.h> #include <net/if.h> #include <sys/ioctl.h> #include <unistd.h> #include <stdlib.h> static int __opensock(void) { int fd; #ifdef __UCLIBC_HAS_IPV6__ fd=socket(AF_INET6,SOCK_DGRAM,0); if (fd<0) #endif /* __UCLIBC_HAS_IPV6__ */ fd=socket(AF_INET,SOCK_DGRAM,0); return(fd); } unsigned int if_nametoindex(const char* ifname) { #ifndef SIOCGIFINDEX __set_errno (ENOSYS); return 0; #else int fd; struct ifreq ifr; 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(fd); if (saved_errno == EINVAL) __set_errno(ENOSYS); return 0; } close(fd); return ifr.ifr_ifindex; #endif /* SIOCGIFINDEX */ } void if_freenameindex (struct if_nameindex *ifn) { struct if_nameindex *ptr = ifn; while (ptr->if_name || ptr->if_index) { if (ptr->if_name) { free (ptr->if_name); } ++ptr; } free (ifn); } struct if_nameindex * if_nameindex (void) { #ifndef SIOCGIFINDEX __set_errno (ENOSYS); return NULL; #else int fd; struct ifconf ifc; unsigned int nifs, i; int rq_len; struct if_nameindex *idx = NULL; # define RQ_IFS 4 fd = __opensock(); if (fd < 0) return 0; ifc.ifc_buf = NULL; /* Guess on the correct buffer size... */ rq_len = RQ_IFS * sizeof (struct ifreq); /* Read all the interfaces out of the kernel. */ do { ifc.ifc_buf = realloc(ifc.ifc_buf, ifc.ifc_len = rq_len); if (ifc.ifc_buf == NULL || ioctl(fd, SIOCGIFCONF, &ifc) < 0) { close(fd); return NULL; } rq_len *= 2; } while (ifc.ifc_len == rq_len); nifs = ifc.ifc_len / sizeof(struct ifreq); idx = malloc ((nifs + 1) * sizeof(struct if_nameindex)); if (idx == NULL) { close(fd); __set_errno(ENOBUFS); return NULL; } 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) { int saved_errno = errno; unsigned int j; for (j = 0; j < i; ++j) free (idx[j].if_name); free(idx); close(fd); if (saved_errno == EINVAL) saved_errno = ENOSYS; else if (saved_errno == ENOMEM) saved_errno = ENOBUFS; __set_errno (saved_errno); return NULL; } idx[i].if_index = ifr->ifr_ifindex; } idx[i].if_index = 0; idx[i].if_name = NULL; close(fd); return idx; #endif } char * if_indextoname (unsigned int ifindex, char *ifname) { struct if_nameindex *idx; struct if_nameindex *p; char *result = NULL; idx = if_nameindex(); if (idx != NULL) { for (p = idx; p->if_index || p->if_name; ++p) { if (p->if_index == ifindex) { result = strncpy (ifname, p->if_name, IFNAMSIZ); break; } } if_freenameindex (idx); } return result; }
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