NetBSD/sbin/ifconfig/af_inet.c

256 lines
7.6 KiB
C

/* $NetBSD: af_inet.c,v 1.13 2009/08/07 19:35:55 dyoung 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 1.13 2009/08/07 19:35:55 dyoung 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"
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 void in_alias(const char *, prop_dictionary_t, prop_dictionary_t,
struct in_aliasreq *);
static void in_preference(const char *, const struct sockaddr *);
static struct afswtch af = {
.af_name = "inet", .af_af = AF_INET, .af_status = in_status,
.af_addr_commit = in_commit_address
};
static void
in_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
struct in_aliasreq *creq)
{
struct ifreq ifr;
bool alias;
int s;
unsigned short flags;
struct in_aliasreq in_addreq;
const struct sockaddr_in * const asin = &in_addreq.ifra_addr;
const struct sockaddr_in * const dsin = &in_addreq.ifra_dstaddr;
const struct sockaddr_in * const bsin = &in_addreq.ifra_broadaddr;
char hbuf[NI_MAXHOST];
const int niflag = Nflag ? 0 : NI_NUMERICHOST;
if (lflag)
return;
alias = true;
/* Get the non-alias address for this interface. */
if ((s = getsock(AF_INET)) == -1) {
if (errno == EAFNOSUPPORT)
return;
err(EXIT_FAILURE, "socket");
}
memset(&ifr, 0, sizeof(ifr));
estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(s, SIOCGIFADDR, &ifr) == -1) {
if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
return;
warn("SIOCGIFADDR");
}
/* If creq and ifr are the same address, this is not an alias. */
if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0)
alias = false;
in_addreq = *creq;
if (ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) {
if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
return;
} else
warn("SIOCGIFALIAS");
}
if (getnameinfo((const struct sockaddr *)asin, asin->sin_len,
hbuf, sizeof(hbuf), NULL, 0, niflag))
strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
printf("\tinet %s%s", alias ? "alias " : "", hbuf);
if (getifflags(env, oenv, &flags) == -1)
err(EXIT_FAILURE, "%s: getifflags", __func__);
if (flags & IFF_POINTOPOINT) {
if (getnameinfo((const struct sockaddr *)dsin, dsin->sin_len,
hbuf, sizeof(hbuf), NULL, 0, niflag))
strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
printf(" -> %s", hbuf);
}
printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr));
if (flags & IFF_BROADCAST) {
if (getnameinfo((const struct sockaddr *)bsin, bsin->sin_len,
hbuf, sizeof(hbuf), NULL, 0, niflag))
strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
printf(" broadcast %s", hbuf);
}
}
static int16_t
in_get_preference(const char *ifname, const struct sockaddr *sa)
{
struct if_addrprefreq ifap;
int s;
if ((s = getsock(AF_INET)) == -1) {
if (errno == EPROTONOSUPPORT)
return 0;
err(EXIT_FAILURE, "socket");
}
memset(&ifap, 0, sizeof(ifap));
estrlcpy(ifap.ifap_name, ifname, sizeof(ifap.ifap_name));
memcpy(&ifap.ifap_addr, sa, MIN(sizeof(ifap.ifap_addr), sa->sa_len));
if (ioctl(s, SIOCGIFADDRPREF, &ifap) == -1) {
if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
return 0;
warn("SIOCGIFADDRPREF");
}
return ifap.ifap_preference;
}
static void
in_preference(const char *ifname, const struct sockaddr *sa)
{
int16_t preference;
if (lflag)
return;
preference = in_get_preference(ifname, sa);
printf(" preference %" PRId16, preference);
}
static void
in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
{
struct ifaddrs *ifap, *ifa;
struct in_aliasreq ifra;
int printprefs = 0;
const char *ifname;
if ((ifname = getifname(env)) == NULL)
err(EXIT_FAILURE, "%s: getifname", __func__);
if (getifaddrs(&ifap) != 0)
err(EXIT_FAILURE, "getifaddrs");
/* Print address preference numbers if any address has a non-zero
* preference assigned.
*/
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;
if (in_get_preference(ifa->ifa_name, ifa->ifa_addr) != 0) {
printprefs = 1;
break;
}
}
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;
if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len)
continue;
memset(&ifra, 0, sizeof(ifra));
estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name));
memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
in_alias(ifa->ifa_name, env, oenv, &ifra);
if (printprefs)
in_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);
}
static void
in_constructor(void)
{
register_family(&af);
}