NetBSD/sbin/ifconfig/af_inet.c

252 lines
7.0 KiB
C

/* $NetBSD: af_inet.c,v 1.28 2020/05/14 08:34:17 msaitoh Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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>
#ifndef lint
__RCSID("$NetBSD: af_inet.c,v 1.28 2020/05/14 08:34:17 msaitoh Exp $");
#endif /* not lint */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <util.h>
#include "env.h"
#include "extern.h"
#include "af_inetany.h"
#include "prog_ops.h"
static void in_constructor(void) __attribute__((constructor));
static void in_status(prop_dictionary_t, prop_dictionary_t, bool);
static void in_commit_address(prop_dictionary_t, prop_dictionary_t);
static bool in_addr_tentative(struct ifaddrs *);
static bool in_addr_tentative_or_detached(struct ifaddrs *);
static in_addr_t in_netmask(struct sockaddr *);
static int in_prefixlen(struct sockaddr *);
static void in_alias(struct ifaddrs *, prop_dictionary_t, prop_dictionary_t);
static struct afswtch af = {
.af_name = "inet", .af_af = AF_INET, .af_status = in_status,
.af_addr_commit = in_commit_address,
.af_addr_tentative = in_addr_tentative,
.af_addr_tentative_or_detached = in_addr_tentative_or_detached
};
static in_addr_t
in_netmask(struct sockaddr *sa)
{
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
memcpy(&sin, sa, sa->sa_len);
return ntohl(sin.sin_addr.s_addr);
}
static int
in_prefixlen(struct sockaddr *sa)
{
in_addr_t mask;
int cidr;
mask = in_netmask(sa);
if (mask == 0) /* mask 0 ==> /0 */
return 0;
cidr = 33 - ffs(mask); /* 33 - (1 .. 32) -> 32 .. 1 */
if (cidr < 32) { /* more than 1 bit in mask */
/* check for non-contig netmask */
if ((mask ^ (((1U << cidr) - 1) << (32 - cidr))) != 0)
return -1; /* noncontig, no pfxlen */
}
return cidr;
}
static void
in_alias(struct ifaddrs *ifa, prop_dictionary_t env, prop_dictionary_t oenv)
{
char hbuf[NI_MAXHOST];
const int niflag = Nflag ? 0 : NI_NUMERICHOST;
int pfxlen;
char fbuf[1024];
if (lflag)
return;
if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len,
hbuf, sizeof(hbuf), NULL, 0, niflag))
strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
printf("\tinet %s", hbuf);
pfxlen = in_prefixlen(ifa->ifa_netmask);
if (pfxlen >= 0)
printf("/%d", pfxlen);
if (ifa->ifa_flags & IFF_POINTOPOINT) {
if (getnameinfo(ifa->ifa_dstaddr, ifa->ifa_dstaddr->sa_len,
hbuf, sizeof(hbuf), NULL, 0, niflag))
strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
printf(" -> %s", hbuf);
}
if (pfxlen < 0)
printf(" netmask %#x", in_netmask(ifa->ifa_netmask));
if (ifa->ifa_flags & IFF_BROADCAST) {
if (getnameinfo(ifa->ifa_broadaddr, ifa->ifa_broadaddr->sa_len,
hbuf, sizeof(hbuf), NULL, 0, niflag))
strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
printf(" broadcast %s", hbuf);
}
(void)snprintb(fbuf, sizeof(fbuf), IN_IFFBITS, ifa->ifa_addrflags);
printf(" flags %s", fbuf);
}
static void
in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
{
struct ifaddrs *ifap, *ifa;
bool printprefs = false;
const char *ifname;
if ((ifname = getifname(env)) == NULL)
err(EXIT_FAILURE, "%s: getifname", __func__);
if (getifaddrs(&ifap) != 0)
err(EXIT_FAILURE, "getifaddrs");
printprefs = ifa_any_preferences(ifname, ifap, AF_INET);
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(ifname, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/* The first address is not an alias. */
in_alias(ifa, env, oenv);
if (printprefs)
ifa_print_preference(ifa->ifa_name, ifa->ifa_addr);
printf("\n");
}
freeifaddrs(ifap);
}
static void
in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
{
struct ifreq in_ifr;
struct in_aliasreq in_ifra;
struct afparam inparam = {
.req = BUFPARAM(in_ifra)
, .dgreq = BUFPARAM(in_ifr)
, .name = {
{.buf = in_ifr.ifr_name,
.buflen = sizeof(in_ifr.ifr_name)}
, {.buf = in_ifra.ifra_name,
.buflen = sizeof(in_ifra.ifra_name)}
}
, .dgaddr = BUFPARAM(in_ifr.ifr_addr)
, .addr = BUFPARAM(in_ifra.ifra_addr)
, .dst = BUFPARAM(in_ifra.ifra_dstaddr)
, .brd = BUFPARAM(in_ifra.ifra_broadaddr)
, .mask = BUFPARAM(in_ifra.ifra_mask)
, .aifaddr = IFADDR_PARAM(SIOCAIFADDR)
, .difaddr = IFADDR_PARAM(SIOCDIFADDR)
, .gifaddr = IFADDR_PARAM(SIOCGIFADDR)
, .defmask = {.buf = NULL, .buflen = 0}
};
memset(&in_ifr, 0, sizeof(in_ifr));
memset(&in_ifra, 0, sizeof(in_ifra));
commit_address(env, oenv, &inparam);
}
#ifdef SIOCGIFAFLAG_IN
static bool
in_addr_flags(struct ifaddrs *ifa, int flags)
{
int s;
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
ifr.ifr_addr = *ifa->ifa_addr;
if ((s = getsock(AF_INET)) == -1)
err(EXIT_FAILURE, "%s: getsock", __func__);
if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1)
err(EXIT_FAILURE, "SIOCGIFAFLAG_IN");
return ifr.ifr_addrflags & flags ? true : false;
}
#endif
static bool
in_addr_tentative(struct ifaddrs *ifa)
{
#ifdef SIOCGIFAFLAG_IN
return in_addr_flags(ifa, IN_IFF_TENTATIVE);
#else
return false;
#endif
}
static bool
in_addr_tentative_or_detached(struct ifaddrs *ifa)
{
#ifdef SIOCGIFAFLAG_IN
return in_addr_flags(ifa, IN_IFF_TENTATIVE | IN_IFF_DETACHED);
#else
return false;
#endif
}
static void
in_constructor(void)
{
register_family(&af);
}