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So far the NSS module looks up only hostnames as provided by guests themselves. However, there are some cases where this is not enough: e.g. when there's a fresh new guest being installed (with some generic hostname) say from a live ISO image; or some (older) systems don't advertise their hostname in DHCP transactions at all. In cases like that it would be helpful if we translate domain name as seen by libvirt too so that users can: # virsh start $dom && ssh $dom In order to achieve that new libvirt-guest module is introduced, while older libvirt module maintains its current behaviour (that is translating guest provided names into IP addresses). Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
209 lines
6.1 KiB
C
209 lines
6.1 KiB
C
/*
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* Copyright (C) 2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Author: Michal Privoznik <mprivozn@redhat.com>
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*/
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#include <config.h>
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#include "testutils.h"
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#ifdef NSS
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# include <stdbool.h>
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# include <arpa/inet.h>
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# include "libvirt_nss.h"
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# include "virsocketaddr.h"
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# define VIR_FROM_THIS VIR_FROM_NONE
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# define BUF_SIZE 1024
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struct testNSSData {
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const char *hostname;
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const char *const *ipAddr;
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int af;
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};
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static int
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testGetHostByName(const void *opaque)
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{
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const struct testNSSData *data = opaque;
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const bool existent = data->hostname && data->ipAddr && data->ipAddr[0];
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int ret = -1;
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struct hostent resolved;
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char buf[BUF_SIZE] = { 0 };
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char **addrList;
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int rv, tmp_errno = 0, tmp_herrno = 0;
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size_t i = 0, j = 0;
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memset(&resolved, 0, sizeof(resolved));
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rv = NSS_NAME(gethostbyname2)(data->hostname,
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data->af,
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&resolved,
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buf, sizeof(buf),
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&tmp_errno,
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&tmp_herrno);
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if (rv == NSS_STATUS_TRYAGAIN ||
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rv == NSS_STATUS_UNAVAIL ||
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rv == NSS_STATUS_RETURN) {
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/* Resolving failed in unexpected fashion. */
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Resolving of %s failed due to internal error",
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data->hostname);
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goto cleanup;
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} else if (rv == NSS_STATUS_NOTFOUND) {
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/* Resolving failed. Should it? */
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if (!existent)
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ret = 0;
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else
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Resolving of %s failed",
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data->hostname);
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goto cleanup;
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}
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/* Resolving succeeded. Should it? */
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if (!existent) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Resolving of %s succeeded but was expected to fail",
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data->hostname);
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goto cleanup;
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}
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/* Now lets see if resolved address match our expectations. */
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if (!resolved.h_name) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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"resolved.h_name empty");
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goto cleanup;
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}
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if (data->af != AF_UNSPEC &&
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resolved.h_addrtype != data->af) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Expected AF_INET (%d) got %d",
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data->af, resolved.h_addrtype);
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goto cleanup;
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}
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if ((resolved.h_addrtype == AF_INET && resolved.h_length != 4) ||
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(resolved.h_addrtype == AF_INET6 && resolved.h_length != 16)) {
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/* IPv4 addresses are encoded into 4 bytes */
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Expected %d bytes long address, got %d",
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resolved.h_addrtype == AF_INET ? 4 : 16,
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resolved.h_length);
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goto cleanup;
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}
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if (!resolved.h_addr_list) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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"resolved.h_addr_list empty");
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goto cleanup;
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}
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addrList = resolved.h_addr_list;
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while (*addrList) {
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virSocketAddr sa;
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char *ipAddr;
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void *address = *addrList;
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memset(&sa, 0, sizeof(sa));
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if (resolved.h_addrtype == AF_INET) {
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virSocketAddrSetIPv4AddrNetOrder(&sa, *((uint32_t *) address));
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} else {
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virSocketAddrSetIPv6AddrNetOrder(&sa, address);
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}
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if (!(ipAddr = virSocketAddrFormat(&sa))) {
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/* error reported by helper */
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goto cleanup;
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}
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for (j = 0; data->ipAddr[j]; j++) {
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if (STREQ(data->ipAddr[j], ipAddr))
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break;
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}
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if (!data->ipAddr[j]) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Unexpected address %s", ipAddr);
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VIR_FREE(ipAddr);
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goto cleanup;
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}
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VIR_FREE(ipAddr);
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addrList++;
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i++;
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}
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for (j = 0; data->ipAddr[j]; j++)
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;
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if (i != j) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"Expected %zu addresses, got %zu", j, i);
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goto cleanup;
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}
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ret = 0;
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cleanup:
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return ret;
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}
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static int
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mymain(void)
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{
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int ret = 0;
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# define DO_TEST(name, family, ...) \
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do { \
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const char *addr[] = { __VA_ARGS__, NULL}; \
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struct testNSSData data = { \
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.hostname = name, .ipAddr = addr, .af = family, \
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}; \
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if (virTestRun(name, testGetHostByName, &data) < 0) \
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ret = -1; \
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} while (0)
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# if !defined(LIBVIRT_NSS_GUEST)
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DO_TEST("fedora", AF_INET, "192.168.122.197", "192.168.122.198", "192.168.122.199");
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DO_TEST("gentoo", AF_INET, "192.168.122.254");
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DO_TEST("gentoo", AF_INET6, "2001:1234:dead:beef::2");
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DO_TEST("gentoo", AF_UNSPEC, "192.168.122.254");
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DO_TEST("non-existent", AF_UNSPEC, NULL);
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# else /* defined(LIBVIRT_NSS_GUEST) */
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DO_TEST("debian", AF_INET, "192.168.122.2");
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DO_TEST("suse", AF_INET, "192.168.122.3");
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# endif /* defined(LIBVIRT_NSS_GUEST) */
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return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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VIRT_TEST_MAIN_PRELOAD(mymain, abs_builddir "/.libs/nssmock.so")
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#else
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int
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main(void)
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{
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return EXIT_AM_SKIP;
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}
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#endif
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