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5af3fa9a5f
If compiled in for dual-stack use, test with feature_present(3) to see if we should register the IPv4/IPv6 address family related options. In case there is no "inet" support we would love to go with the usage() and make the address family mandatory (as it is for anything but inet in theory). Unfortunately people are used to ifconfig IF up/down etc. as well, so use a fallback of "link". Adjust the man page to reflect these minor details. Improve error handling printing a warning in addition to the usage telling that we do not know the given address family in two places. Reviewed by: hrs, rwatson Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems MFC after: 2 weeks
207 lines
5.7 KiB
C
207 lines
5.7 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. 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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <ctype.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ifaddrs.h>
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#include <netinet/in.h>
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#include <net/if_var.h> /* for struct ifaddr */
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#include <netinet/in_var.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "ifconfig.h"
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static struct in_aliasreq in_addreq;
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static struct ifreq in_ridreq;
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static void
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in_status(int s __unused, const struct ifaddrs *ifa)
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{
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struct sockaddr_in *sin, null_sin;
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memset(&null_sin, 0, sizeof(null_sin));
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sin = (struct sockaddr_in *)ifa->ifa_addr;
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if (sin == NULL)
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return;
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printf("\tinet %s ", inet_ntoa(sin->sin_addr));
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if (ifa->ifa_flags & IFF_POINTOPOINT) {
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sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
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if (sin == NULL)
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sin = &null_sin;
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printf("--> %s ", inet_ntoa(sin->sin_addr));
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}
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sin = (struct sockaddr_in *)ifa->ifa_netmask;
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if (sin == NULL)
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sin = &null_sin;
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printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
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if (ifa->ifa_flags & IFF_BROADCAST) {
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sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
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if (sin != NULL && sin->sin_addr.s_addr != 0)
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printf("broadcast %s", inet_ntoa(sin->sin_addr));
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}
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putchar('\n');
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}
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#define SIN(x) ((struct sockaddr_in *) &(x))
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static struct sockaddr_in *sintab[] = {
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SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
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SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
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};
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static void
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in_getaddr(const char *s, int which)
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{
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#define MIN(a,b) ((a)<(b)?(a):(b))
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struct sockaddr_in *sin = sintab[which];
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struct hostent *hp;
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struct netent *np;
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sin->sin_len = sizeof(*sin);
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if (which != MASK)
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sin->sin_family = AF_INET;
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if (which == ADDR) {
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char *p = NULL;
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if((p = strrchr(s, '/')) != NULL) {
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const char *errstr;
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/* address is `name/masklen' */
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int masklen;
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struct sockaddr_in *min = sintab[MASK];
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*p = '\0';
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if (!isdigit(*(p + 1)))
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errstr = "invalid";
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else
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masklen = (int)strtonum(p + 1, 0, 32, &errstr);
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if (errstr != NULL) {
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*p = '/';
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errx(1, "%s: bad value (width %s)", s, errstr);
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}
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min->sin_len = sizeof(*min);
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min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
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0xffffffff);
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}
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}
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if (inet_aton(s, &sin->sin_addr))
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return;
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if ((hp = gethostbyname(s)) != 0)
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bcopy(hp->h_addr, (char *)&sin->sin_addr,
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MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
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else if ((np = getnetbyname(s)) != 0)
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sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
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else
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errx(1, "%s: bad value", s);
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#undef MIN
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}
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static void
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in_status_tunnel(int s)
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{
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char src[NI_MAXHOST];
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char dst[NI_MAXHOST];
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struct ifreq ifr;
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const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, name, IFNAMSIZ);
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if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
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return;
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if (sa->sa_family != AF_INET)
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return;
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if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
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src[0] = '\0';
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if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
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return;
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if (sa->sa_family != AF_INET)
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return;
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if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
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dst[0] = '\0';
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printf("\ttunnel inet %s --> %s\n", src, dst);
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}
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static void
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in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
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{
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struct in_aliasreq addreq;
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memset(&addreq, 0, sizeof(addreq));
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strncpy(addreq.ifra_name, name, IFNAMSIZ);
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memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
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memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
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if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
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warn("SIOCSIFPHYADDR");
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}
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static struct afswtch af_inet = {
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.af_name = "inet",
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.af_af = AF_INET,
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.af_status = in_status,
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.af_getaddr = in_getaddr,
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.af_status_tunnel = in_status_tunnel,
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.af_settunnel = in_set_tunnel,
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.af_difaddr = SIOCDIFADDR,
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.af_aifaddr = SIOCAIFADDR,
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.af_ridreq = &in_ridreq,
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.af_addreq = &in_addreq,
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};
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static __constructor void
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inet_ctor(void)
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{
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if (!feature_present("inet"))
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return;
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af_register(&af_inet);
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}
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