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22f7ceb695
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>
139 lines
3.0 KiB
C
139 lines
3.0 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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#ifdef NSS
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# include "virmock.h"
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# include <sys/types.h>
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# include <dirent.h>
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# include <sys/stat.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include "configmake.h"
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# include "virstring.h"
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# include "viralloc.h"
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static int (*real_open)(const char *path, int flags, ...);
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static DIR * (*real_opendir)(const char *name);
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static int (*real_access)(const char *path, int mode);
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# define LEASEDIR LOCALSTATEDIR "/lib/libvirt/dnsmasq/"
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/*
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* Functions to load the symbols and init the environment
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*/
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static void
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init_syms(void)
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{
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if (real_open)
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return;
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VIR_MOCK_REAL_INIT(open);
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VIR_MOCK_REAL_INIT(opendir);
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VIR_MOCK_REAL_INIT(access);
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}
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static int
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getrealpath(char **newpath,
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const char *path)
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{
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if (STRPREFIX(path, LEASEDIR)) {
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if (virAsprintfQuiet(newpath, "%s/nssdata/%s",
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abs_srcdir,
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path + strlen(LEASEDIR)) < 0) {
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errno = ENOMEM;
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return -1;
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}
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} else {
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if (VIR_STRDUP_QUIET(*newpath, path) < 0)
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return -1;
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}
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return 0;
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}
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int
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open(const char *path, int flags, ...)
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{
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int ret;
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char *newpath = NULL;
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init_syms();
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if (STRPREFIX(path, LEASEDIR) &&
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getrealpath(&newpath, path) < 0)
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return -1;
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if (flags & O_CREAT) {
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va_list ap;
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mode_t mode;
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va_start(ap, flags);
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mode = va_arg(ap, int);
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va_end(ap);
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ret = real_open(newpath ? newpath : path, flags, mode);
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} else {
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ret = real_open(newpath ? newpath : path, flags);
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}
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free(newpath);
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return ret;
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}
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DIR *
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opendir(const char *path)
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{
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DIR *ret;
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char *newpath = NULL;
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init_syms();
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if (STRPREFIX(path, LEASEDIR) &&
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getrealpath(&newpath, path) < 0)
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return NULL;
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ret = real_opendir(newpath ? newpath : path);
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free(newpath);
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return ret;
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}
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int
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access(const char *path, int mode)
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{
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int ret;
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char *newpath = NULL;
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init_syms();
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if (STRPREFIX(path, LEASEDIR) &&
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getrealpath(&newpath, path) < 0)
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return -1;
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ret = real_access(newpath ? newpath : path, mode);
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free(newpath);
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return ret;
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}
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#else
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/* Nothing to override if NSS plugin is not enabled */
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#endif
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