253 lines
7.0 KiB
C
253 lines
7.0 KiB
C
/* $NetBSD: af_inet.c,v 1.24 2016/10/01 20:59:49 kre Exp $ */
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/*
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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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* 3. 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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: af_inet.c,v 1.24 2016/10/01 20:59:49 kre Exp $");
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#endif /* not lint */
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#include <sys/param.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 <netinet/in.h>
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#include <netinet/in_var.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <util.h>
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#include "env.h"
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#include "extern.h"
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#include "af_inetany.h"
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#include "prog_ops.h"
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static void in_constructor(void) __attribute__((constructor));
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static void in_status(prop_dictionary_t, prop_dictionary_t, bool);
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static void in_commit_address(prop_dictionary_t, prop_dictionary_t);
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static bool in_addr_tentative(struct ifaddrs *);
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static bool in_addr_tentative_or_detached(struct ifaddrs *);
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static in_addr_t in_netmask(struct sockaddr *);;
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static int in_prefixlen(struct sockaddr *);
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static void in_alias(struct ifaddrs *, prop_dictionary_t, prop_dictionary_t);
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static struct afswtch af = {
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.af_name = "inet", .af_af = AF_INET, .af_status = in_status,
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.af_addr_commit = in_commit_address,
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.af_addr_tentative = in_addr_tentative,
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.af_addr_tentative_or_detached = in_addr_tentative_or_detached
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};
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static in_addr_t
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in_netmask(struct sockaddr *sa)
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{
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struct sockaddr_in sin;
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memset(&sin, 0, sizeof(sin));
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memcpy(&sin, sa, sa->sa_len);
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return ntohl(sin.sin_addr.s_addr);
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}
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static int
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in_prefixlen(struct sockaddr *sa)
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{
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in_addr_t mask;
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int cidr;
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mask = in_netmask(sa);
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if (mask == 0) /* mask 0 ==> /0 */
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return 0;
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cidr = 33 - ffs(mask); /* 33 - (1 .. 32) -> 32 .. 1 */
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if (cidr < 32) { /* more than 1 bit in mask */
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/* check for non-contig netmask */
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if ((mask ^ (((1 << cidr) - 1) << (32 - cidr))) != 0)
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return -1; /* noncontig, no pfxlen */
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}
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return cidr;
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}
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static void
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in_alias(struct ifaddrs *ifa, prop_dictionary_t env, prop_dictionary_t oenv)
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{
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char hbuf[NI_MAXHOST];
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const int niflag = Nflag ? 0 : NI_NUMERICHOST;
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int pfxlen;
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char fbuf[1024];
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if (lflag)
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return;
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if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len,
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hbuf, sizeof(hbuf), NULL, 0, niflag))
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strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
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printf("\tinet %s", hbuf);
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pfxlen = in_prefixlen(ifa->ifa_netmask);
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if (pfxlen >= 0)
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printf("/%d", pfxlen);
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if (ifa->ifa_flags & IFF_POINTOPOINT) {
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if (getnameinfo(ifa->ifa_dstaddr, ifa->ifa_dstaddr->sa_len,
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hbuf, sizeof(hbuf), NULL, 0, niflag))
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strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
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printf(" -> %s", hbuf);
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}
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if (pfxlen < 0)
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printf(" netmask %#x", in_netmask(ifa->ifa_netmask));
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if (ifa->ifa_flags & IFF_BROADCAST) {
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if (getnameinfo(ifa->ifa_broadaddr, ifa->ifa_broadaddr->sa_len,
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hbuf, sizeof(hbuf), NULL, 0, niflag))
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strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
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printf(" broadcast %s", hbuf);
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}
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(void)snprintb(fbuf, sizeof(fbuf), IN_IFFBITS, ifa->ifa_addrflags);
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printf(" flags %s", fbuf);
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}
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static void
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in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
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{
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struct ifaddrs *ifap, *ifa;
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bool printprefs = false;
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const char *ifname;
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if ((ifname = getifname(env)) == NULL)
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err(EXIT_FAILURE, "%s: getifname", __func__);
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if (getifaddrs(&ifap) != 0)
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err(EXIT_FAILURE, "getifaddrs");
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printprefs = ifa_any_preferences(ifname, ifap, AF_INET);
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for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
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if (strcmp(ifname, ifa->ifa_name) != 0)
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continue;
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if (ifa->ifa_addr->sa_family != AF_INET)
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continue;
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/* The first address is not an alias. */
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in_alias(ifa, env, oenv);
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if (printprefs)
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ifa_print_preference(ifa->ifa_name, ifa->ifa_addr);
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printf("\n");
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}
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freeifaddrs(ifap);
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}
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static void
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in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
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{
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struct ifreq in_ifr;
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struct in_aliasreq in_ifra;
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struct afparam inparam = {
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.req = BUFPARAM(in_ifra)
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, .dgreq = BUFPARAM(in_ifr)
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, .name = {
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{.buf = in_ifr.ifr_name,
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.buflen = sizeof(in_ifr.ifr_name)}
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, {.buf = in_ifra.ifra_name,
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.buflen = sizeof(in_ifra.ifra_name)}
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}
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, .dgaddr = BUFPARAM(in_ifr.ifr_addr)
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, .addr = BUFPARAM(in_ifra.ifra_addr)
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, .dst = BUFPARAM(in_ifra.ifra_dstaddr)
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, .brd = BUFPARAM(in_ifra.ifra_broadaddr)
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, .mask = BUFPARAM(in_ifra.ifra_mask)
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, .aifaddr = IFADDR_PARAM(SIOCAIFADDR)
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, .difaddr = IFADDR_PARAM(SIOCDIFADDR)
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, .gifaddr = IFADDR_PARAM(SIOCGIFADDR)
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, .defmask = {.buf = NULL, .buflen = 0}
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};
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memset(&in_ifr, 0, sizeof(in_ifr));
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memset(&in_ifra, 0, sizeof(in_ifra));
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commit_address(env, oenv, &inparam);
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}
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#ifdef SIOCGIFAFLAG_IN
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static bool
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in_addr_flags(struct ifaddrs *ifa, int flags)
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{
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int s;
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
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ifr.ifr_addr = *ifa->ifa_addr;
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if ((s = getsock(AF_INET)) == -1)
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err(EXIT_FAILURE, "%s: getsock", __func__);
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if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1)
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err(EXIT_FAILURE, "SIOCGIFAFLAG_IN");
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return ifr.ifr_addrflags & flags ? true : false;
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return false;
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}
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#endif
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static bool
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in_addr_tentative(struct ifaddrs *ifa)
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{
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#ifdef SIOCGIFAFLAG_IN
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return in_addr_flags(ifa, IN_IFF_TENTATIVE);
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#else
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return false;
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#endif
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}
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static bool
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in_addr_tentative_or_detached(struct ifaddrs *ifa)
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{
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#ifdef SIOCGIFAFLAG_IN
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return in_addr_flags(ifa, IN_IFF_TENTATIVE | IN_IFF_DETACHED);
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#else
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return false;
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#endif
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}
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static void
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in_constructor(void)
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{
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register_family(&af);
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}
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