mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
58a575135b
Submitted by: Adrian Penisoara <ady@freebsd.ady.ro>
546 lines
15 KiB
C
546 lines
15 KiB
C
/*-
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* Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <arpa/inet.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <termios.h>
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#include <unistd.h>
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#include "layer.h"
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#include "defs.h"
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "id.h"
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#include "timer.h"
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#include "fsm.h"
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#include "iplist.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "throughput.h"
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#include "slcompress.h"
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#include "descriptor.h"
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#include "ipcp.h"
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#include "filter.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "mp.h"
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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "bundle.h"
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#include "prompt.h"
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#include "iface.h"
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static int
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bitsinmask(struct in_addr mask)
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{
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u_int32_t bitmask, maskaddr;
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int bits;
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bitmask = 0xffffffff;
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maskaddr = ntohl(mask.s_addr);
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for (bits = 32; bits >= 0; bits--) {
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if (maskaddr == bitmask)
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break;
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bitmask &= ~(1 << (32 - bits));
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}
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return bits;
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}
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struct iface *
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iface_Create(const char *name)
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{
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int mib[6], s;
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size_t needed, namelen;
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char *buf, *ptr, *end;
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struct if_msghdr *ifm;
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struct ifa_msghdr *ifam;
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struct sockaddr_dl *dl;
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struct sockaddr *sa[RTAX_MAX];
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struct iface *iface;
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struct iface_addr *addr;
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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fprintf(stderr, "iface_Create: socket(): %s\n", strerror(errno));
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return NULL;
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}
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_IFLIST;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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fprintf(stderr, "iface_Create: sysctl: estimate: %s\n",
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strerror(errno));
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close(s);
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return NULL;
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}
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if ((buf = (char *)malloc(needed)) == NULL) {
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fprintf(stderr, "iface_Create: malloc failed: %s\n", strerror(errno));
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close(s);
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return NULL;
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}
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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fprintf(stderr, "iface_Create: sysctl: %s\n", strerror(errno));
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free(buf);
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close(s);
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return NULL;
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}
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ptr = buf;
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end = buf + needed;
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iface = NULL;
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namelen = strlen(name);
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while (ptr < end && iface == NULL) {
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ifm = (struct if_msghdr *)ptr; /* On if_msghdr */
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if (ifm->ifm_type != RTM_IFINFO)
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break;
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dl = (struct sockaddr_dl *)(ifm + 1); /* Single _dl at end */
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if (dl->sdl_nlen == namelen && !strncmp(name, dl->sdl_data, namelen)) {
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iface = (struct iface *)malloc(sizeof *iface);
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if (iface == NULL) {
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fprintf(stderr, "iface_Create: malloc: %s\n", strerror(errno));
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return NULL;
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}
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iface->name = strdup(name);
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iface->flags = ifm->ifm_flags;
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iface->index = ifm->ifm_index;
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iface->in_addrs = 0;
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iface->in_addr = NULL;
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}
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ptr += ifm->ifm_msglen; /* First ifa_msghdr */
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for (; ptr < end; ptr += ifam->ifam_msglen) {
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ifam = (struct ifa_msghdr *)ptr; /* Next if address */
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if (ifam->ifam_type != RTM_NEWADDR) /* finished this if */
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break;
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if (iface != NULL && ifam->ifam_addrs & RTA_IFA) {
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/* Found a configured interface ! */
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iface_ParseHdr(ifam, sa);
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if (sa[RTAX_IFA] && sa[RTAX_IFA]->sa_family == AF_INET) {
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/* Record the address */
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addr = (struct iface_addr *)realloc
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(iface->in_addr, (iface->in_addrs + 1) * sizeof iface->in_addr[0]);
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if (addr == NULL)
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break;
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iface->in_addr = addr;
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addr += iface->in_addrs;
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iface->in_addrs++;
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addr->ifa = ((struct sockaddr_in *)sa[RTAX_IFA])->sin_addr;
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if (sa[RTAX_BRD])
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addr->brd = ((struct sockaddr_in *)sa[RTAX_BRD])->sin_addr;
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else
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addr->brd.s_addr = INADDR_ANY;
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if (sa[RTAX_NETMASK])
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addr->mask = ((struct sockaddr_in *)sa[RTAX_NETMASK])->sin_addr;
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else
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addr->mask.s_addr = INADDR_ANY;
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addr->bits = bitsinmask(addr->mask);
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}
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}
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}
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}
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free(buf);
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close(s);
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return iface;
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}
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static void
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iface_addr_Zap(const char *name, struct iface_addr *addr)
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{
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struct ifaliasreq ifra;
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struct sockaddr_in *me, *peer;
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int s;
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s = ID0socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0)
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log_Printf(LogERROR, "iface_addr_Zap: socket(): %s\n", strerror(errno));
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else {
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memset(&ifra, '\0', sizeof ifra);
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strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1);
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me = (struct sockaddr_in *)&ifra.ifra_addr;
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peer = (struct sockaddr_in *)&ifra.ifra_broadaddr;
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me->sin_family = peer->sin_family = AF_INET;
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me->sin_len = peer->sin_len = sizeof(struct sockaddr_in);
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me->sin_addr = addr->ifa;
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peer->sin_addr = addr->brd;
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log_Printf(LogDEBUG, "Delete %s\n", inet_ntoa(addr->ifa));
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if (ID0ioctl(s, SIOCDIFADDR, &ifra) < 0)
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log_Printf(LogWARN, "iface_addr_Zap: ioctl(SIOCDIFADDR, %s): %s\n",
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inet_ntoa(addr->ifa), strerror(errno));
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close(s);
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}
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}
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void
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iface_inClear(struct iface *iface, int how)
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{
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int n, addrs;
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if (iface->in_addrs) {
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addrs = n = how == IFACE_CLEAR_ALL ? 0 : 1;
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for (; n < iface->in_addrs; n++)
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iface_addr_Zap(iface->name, iface->in_addr + n);
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iface->in_addrs = addrs;
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/* Don't bother realloc()ing - we have little to gain */
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}
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}
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int
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iface_inAdd(struct iface *iface, struct in_addr ifa, struct in_addr mask,
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struct in_addr brd, int how)
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{
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int slot, s, chg;
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struct ifaliasreq ifra;
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struct sockaddr_in *me, *peer, *msk;
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struct iface_addr *addr;
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for (slot = 0; slot < iface->in_addrs; slot++)
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if (iface->in_addr[slot].ifa.s_addr == ifa.s_addr) {
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if (how & IFACE_FORCE_ADD)
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break;
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else
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/* errno = EEXIST; */
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return 0;
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}
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addr = (struct iface_addr *)realloc
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(iface->in_addr, (iface->in_addrs + 1) * sizeof iface->in_addr[0]);
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if (addr == NULL) {
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log_Printf(LogERROR, "iface_inAdd: realloc: %s\n", strerror(errno));
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return 0;
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}
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iface->in_addr = addr;
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s = ID0socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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log_Printf(LogERROR, "iface_inAdd: socket(): %s\n", strerror(errno));
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return 0;
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}
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/*
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* We've gotta be careful here. If we try to add an address with the
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* same destination as an existing interface, nothing will work.
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* Instead, we tweak all previous address entries that match the
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* to-be-added destination to 255.255.255.255 (w/ a similar netmask).
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* There *may* be more than one - if the user has ``iface add''ed
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* stuff previously.
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*/
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for (chg = 0; chg < iface->in_addrs; chg++) {
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if ((iface->in_addr[chg].brd.s_addr == brd.s_addr &&
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brd.s_addr != INADDR_BROADCAST) || chg == slot) {
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memset(&ifra, '\0', sizeof ifra);
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strncpy(ifra.ifra_name, iface->name, sizeof ifra.ifra_name - 1);
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me = (struct sockaddr_in *)&ifra.ifra_addr;
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msk = (struct sockaddr_in *)&ifra.ifra_mask;
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peer = (struct sockaddr_in *)&ifra.ifra_broadaddr;
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me->sin_family = msk->sin_family = peer->sin_family = AF_INET;
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me->sin_len = msk->sin_len = peer->sin_len = sizeof(struct sockaddr_in);
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me->sin_addr = iface->in_addr[chg].ifa;
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msk->sin_addr = iface->in_addr[chg].mask;
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peer->sin_addr = iface->in_addr[chg].brd;
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log_Printf(LogDEBUG, "Delete %s\n", inet_ntoa(me->sin_addr));
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ID0ioctl(s, SIOCDIFADDR, &ifra); /* Don't care if it fails... */
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if (chg != slot) {
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peer->sin_addr.s_addr = iface->in_addr[chg].brd.s_addr =
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msk->sin_addr.s_addr = iface->in_addr[chg].mask.s_addr =
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INADDR_BROADCAST;
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iface->in_addr[chg].bits = 32;
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log_Printf(LogDEBUG, "Add %s -> 255.255.255.255\n",
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inet_ntoa(me->sin_addr));
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if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0 && errno != EEXIST) {
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/* Oops - that's bad(ish) news ! We've lost an alias ! */
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log_Printf(LogERROR, "iface_inAdd: ioctl(SIOCAIFADDR): %s: %s\n",
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inet_ntoa(me->sin_addr), strerror(errno));
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iface->in_addrs--;
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bcopy(iface->in_addr + chg + 1, iface->in_addr + chg,
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(iface->in_addrs - chg) * sizeof iface->in_addr[0]);
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if (slot > chg)
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slot--;
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chg--;
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}
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}
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}
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}
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memset(&ifra, '\0', sizeof ifra);
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strncpy(ifra.ifra_name, iface->name, sizeof ifra.ifra_name - 1);
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me = (struct sockaddr_in *)&ifra.ifra_addr;
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msk = (struct sockaddr_in *)&ifra.ifra_mask;
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peer = (struct sockaddr_in *)&ifra.ifra_broadaddr;
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me->sin_family = msk->sin_family = peer->sin_family = AF_INET;
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me->sin_len = msk->sin_len = peer->sin_len = sizeof(struct sockaddr_in);
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me->sin_addr = ifa;
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msk->sin_addr = mask;
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peer->sin_addr = brd;
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if (log_IsKept(LogDEBUG)) {
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char buf[16];
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strncpy(buf, inet_ntoa(brd), sizeof buf-1);
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buf[sizeof buf - 1] = '\0';
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log_Printf(LogDEBUG, "Add %s -> %s\n", inet_ntoa(ifa), buf);
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}
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/* An EEXIST failure w/ brd == INADDR_BROADCAST is ok (and works!) */
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if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0 &&
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(brd.s_addr != INADDR_BROADCAST || errno != EEXIST)) {
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log_Printf(LogERROR, "iface_inAdd: ioctl(SIOCAIFADDR): %s: %s\n",
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inet_ntoa(ifa), strerror(errno));
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ID0ioctl(s, SIOCDIFADDR, &ifra); /* EEXIST ? */
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close(s);
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return 0;
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}
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close(s);
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if (slot == iface->in_addrs) {
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/* We're adding a new interface address */
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if (how & IFACE_ADD_FIRST) {
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/* Stuff it at the start of our list */
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slot = 0;
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bcopy(iface->in_addr, iface->in_addr + 1,
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iface->in_addrs * sizeof iface->in_addr[0]);
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}
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iface->in_addrs++;
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} else if (how & IFACE_ADD_FIRST) {
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/* Shift it up to the first slot */
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bcopy(iface->in_addr, iface->in_addr + 1, slot * sizeof iface->in_addr[0]);
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slot = 0;
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}
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iface->in_addr[slot].ifa = ifa;
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iface->in_addr[slot].mask = mask;
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iface->in_addr[slot].brd = brd;
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iface->in_addr[slot].bits = bitsinmask(iface->in_addr[slot].mask);
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return 1;
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}
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int
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iface_inDelete(struct iface *iface, struct in_addr ip)
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{
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int n;
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for (n = 0; n < iface->in_addrs; n++)
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if (iface->in_addr[n].ifa.s_addr == ip.s_addr) {
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iface_addr_Zap(iface->name, iface->in_addr + n);
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bcopy(iface->in_addr + n + 1, iface->in_addr + n,
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(iface->in_addrs - n - 1) * sizeof iface->in_addr[0]);
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iface->in_addrs--;
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return 1;
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}
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return 0;
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}
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#define IFACE_ADDFLAGS 1
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#define IFACE_DELFLAGS 2
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static int
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iface_ChangeFlags(struct iface *iface, int flags, int how)
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{
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struct ifreq ifrq;
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int s;
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s = ID0socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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log_Printf(LogERROR, "iface_ChangeFlags: socket: %s\n", strerror(errno));
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return 0;
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}
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memset(&ifrq, '\0', sizeof ifrq);
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strncpy(ifrq.ifr_name, iface->name, sizeof ifrq.ifr_name - 1);
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ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0';
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if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) {
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log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCGIFFLAGS): %s\n",
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strerror(errno));
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close(s);
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return 0;
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}
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if (how == IFACE_ADDFLAGS)
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ifrq.ifr_flags |= flags;
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else
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ifrq.ifr_flags &= ~flags;
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if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) {
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log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCSIFFLAGS): %s\n",
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strerror(errno));
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close(s);
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return 0;
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}
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close(s);
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return 1; /* Success */
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}
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int
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iface_SetFlags(struct iface *iface, int flags)
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{
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return iface_ChangeFlags(iface, flags, IFACE_ADDFLAGS);
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}
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int
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iface_ClearFlags(struct iface *iface, int flags)
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{
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return iface_ChangeFlags(iface, flags, IFACE_DELFLAGS);
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}
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void
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iface_Destroy(struct iface *iface)
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{
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/*
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* iface_Clear(iface, IFACE_CLEAR_ALL) must be called manually
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* if that's what the user wants. It's better to leave the interface
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* allocated so that existing connections can continue to work.
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*/
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if (iface != NULL) {
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free(iface->name);
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free(iface->in_addr);
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free(iface);
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}
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}
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#define if_entry(x) { IFF_##x, #x }
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struct {
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int flag;
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const char *value;
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} if_flags[] = {
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if_entry(UP),
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if_entry(BROADCAST),
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if_entry(DEBUG),
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if_entry(LOOPBACK),
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if_entry(POINTOPOINT),
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if_entry(RUNNING),
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if_entry(NOARP),
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if_entry(PROMISC),
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if_entry(ALLMULTI),
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if_entry(OACTIVE),
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if_entry(SIMPLEX),
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if_entry(LINK0),
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if_entry(LINK1),
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if_entry(LINK2),
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if_entry(MULTICAST),
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{ 0, "???" }
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};
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int
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iface_Show(struct cmdargs const *arg)
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{
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struct iface *iface = arg->bundle->iface, *current;
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int f, flags;
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current = iface_Create(iface->name);
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flags = iface->flags = current->flags;
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iface_Destroy(current);
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prompt_Printf(arg->prompt, "%s (idx %d) <", iface->name, iface->index);
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for (f = 0; f < sizeof if_flags / sizeof if_flags[0]; f++)
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if ((if_flags[f].flag & flags) || (!if_flags[f].flag && flags)) {
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prompt_Printf(arg->prompt, "%s%s", flags == iface->flags ? "" : ",",
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if_flags[f].value);
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flags &= ~if_flags[f].flag;
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}
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prompt_Printf(arg->prompt, "> has %d address%s:\n", iface->in_addrs,
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iface->in_addrs == 1 ? "" : "es");
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for (f = 0; f < iface->in_addrs; f++) {
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prompt_Printf(arg->prompt, " %s", inet_ntoa(iface->in_addr[f].ifa));
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if (iface->in_addr[f].bits >= 0)
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prompt_Printf(arg->prompt, "/%d", iface->in_addr[f].bits);
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if (iface->flags & IFF_POINTOPOINT)
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prompt_Printf(arg->prompt, " -> %s", inet_ntoa(iface->in_addr[f].brd));
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else if (iface->flags & IFF_BROADCAST)
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prompt_Printf(arg->prompt, " broadcast %s",
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inet_ntoa(iface->in_addr[f].brd));
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if (iface->in_addr[f].bits < 0)
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prompt_Printf(arg->prompt, " (mask %s)",
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inet_ntoa(iface->in_addr[f].mask));
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prompt_Printf(arg->prompt, "\n");
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}
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return 0;
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}
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void
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iface_ParseHdr(struct ifa_msghdr *ifam, struct sockaddr *sa[RTAX_MAX])
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{
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char *wp;
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int rtax;
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wp = (char *)(ifam + 1);
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for (rtax = 0; rtax < RTAX_MAX; rtax++)
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if (ifam->ifam_addrs & (1 << rtax)) {
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sa[rtax] = (struct sockaddr *)wp;
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wp += ROUNDUP(sa[rtax]->sa_len);
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} else
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sa[rtax] = NULL;
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}
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