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/* $KAME: ifname.c,v 1.4 2001/08/20 02:32:40 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #include <sys/types.h> #include <sys/types.h> /* * TODO: * - prototype defs into arpa/inet.h, not net/if.h (bsd-api-new-02) */ #include <sys/param.h> #include <sys/socket.h> #include <sys/sockio.h> #include <sys/sysctl.h> #include <net/if.h> #include <net/route.h> #include <net/if_dl.h> #include <unistd.h> #include <errno.h> #include <stdlib.h> #include <string.h> #define ROUNDUP(a) \ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) #define ADVANCE(x, n) static unsigned int if_onametoindex(ifname) const char *ifname; { struct if_nameindex *iff = if_nameindex(), *ifx; int ret; if (iff == NULL) return 0; ifx = iff; while (ifx->if_name != NULL) { if (strcmp(ifx->if_name, ifname) == 0) { ret = ifx->if_index; if_freenameindex(iff); return ret; } ifx++; } if_freenameindex(iff); errno = ENXIO; return 0; } unsigned int if_nametoindex(ifname) const char *ifname; { int s; struct ifreq ifr; s = socket(AF_INET, SOCK_DGRAM, 0); if (s == -1) return (0); strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) { close (s); return (if_onametoindex(ifname)); } close(s); return (ifr.ifr_index); } char * if_indextoname(ifindex, ifname) unsigned int ifindex; char *ifname; /* at least IF_NAMESIZE */ { struct if_nameindex *iff = if_nameindex(), *ifx; char *cp, *dp; if (iff == NULL) return NULL; ifx = iff; while (ifx->if_index != 0) { if (ifx->if_index == ifindex) { cp = ifname; dp = ifx->if_name; while ((*cp++ = *dp++)) ; if_freenameindex(iff); return (ifname); } ifx++; } if_freenameindex(iff); errno = ENXIO; return NULL; } struct if_nameindex * if_nameindex() { size_t needed; int mib[6], i, ifn = 0, off = 0, hlen; char *buf = NULL, *lim, *next, *cp, *ifbuf = NULL; struct rt_msghdr *rtm; struct if_msghdr *ifm; struct sockaddr *sa; struct if_nameindex *ret = NULL; static int ifxs = 64; /* initial upper limit */ struct _ifx { int if_index; int if_off; } *ifx = NULL; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; /* protocol */ mib[3] = 0; /* wildcard address family */ mib[4] = 0; mib[5] = 0; /* no flags */ if (__sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) return NULL; if ((buf = malloc(needed)) == NULL) { errno = ENOMEM; goto end; } /* XXX: we may have allocated too much than necessary */ if ((ifbuf = malloc(needed)) == NULL) { errno = ENOMEM; goto end; } if ((ifx = (struct _ifx *)malloc(sizeof(*ifx) * ifxs)) == NULL) { errno = ENOMEM; goto end; } if (__sysctl(mib, 6, buf, &needed, NULL, 0) < 0) { /* sysctl has set errno */ goto end; } lim = buf + needed; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; if (rtm->rtm_version != RTM_VERSION) { errno = EPROTONOSUPPORT; goto end; } switch (rtm->rtm_type) { case RTM_IFINFO: ifm = (struct if_msghdr *)rtm; ifx[ifn].if_index = ifm->ifm_index; ifx[ifn].if_off = off; cp = (char *)(ifm + 1); for (i = 1; i; i <<= 1) { if (i & ifm->ifm_addrs) { sa = (struct sockaddr *)cp; ADVANCE(cp, sa); } } if (++ifn == ifxs) { /* we need more memory */ struct _ifx *newifx; ifxs *= 2; if ((newifx = (struct _ifx *)malloc(sizeof(*newifx) * ifxs)) == NULL) { errno = ENOMEM; goto end; } /* copy and free old data */ memcpy(newifx, ifx, (sizeof(*ifx) * ifxs) / 2); free(ifx); ifx = newifx; } } } hlen = sizeof(struct if_nameindex) * (ifn + 1); if ((cp = (char *)malloc(hlen + off)) == NULL) { errno = ENOMEM; goto end; } bcopy(ifbuf, cp + hlen, off); ret = (struct if_nameindex *)cp; for (i = 0; i < ifn; i++) { ret[i].if_index = ifx[i].if_index; ret[i].if_name = cp + hlen + ifx[i].if_off; } ret[ifn].if_index = 0; ret[ifn].if_name = NULL; end: if (buf) free(buf); if (ifbuf) free(ifbuf); if (ifx) free(ifx); return ret; } void if_freenameindex(ptr) struct if_nameindex *ptr; { free(ptr); }