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38e32d4ac1
A small test to see how is the nss module working. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
141 lines
3.7 KiB
C
141 lines
3.7 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 __linux__
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# include <stdio.h>
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# include <stdlib.h>
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# include <dlfcn.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 "configmake.h"
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# include "internal.h"
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# include "virstring.h"
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# include "viralloc.h"
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static int (*realopen)(const char *path, int flags, ...);
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static DIR * (*realopendir)(const char *name);
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# define LEASEDIR LOCALSTATEDIR "/lib/libvirt/dnsmasq/"
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# define STDERR(...) \
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fprintf(stderr, "%s %zu: ", __FUNCTION__, (size_t) __LINE__); \
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fprintf(stderr, __VA_ARGS__); \
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fprintf(stderr, "\n"); \
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# define ABORT(...) \
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do { \
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STDERR(__VA_ARGS__); \
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abort(); \
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} while (0)
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# define ABORT_OOM() \
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ABORT("Out of memory")
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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 (realopen)
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return;
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# define LOAD_SYM(name) \
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do { \
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if (!(real ## name = dlsym(RTLD_NEXT, #name))) \
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ABORT("Cannot find real '%s' symbol\n", #name); \
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} while (0)
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LOAD_SYM(open);
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LOAD_SYM(opendir);
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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, mode_t);
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va_end(ap);
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ret = realopen(newpath ? newpath : path, flags, mode);
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} else {
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ret = realopen(newpath ? newpath : path, flags);
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}
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VIR_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 = realopendir(newpath ? newpath : path);
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VIR_FREE(newpath);
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return ret;
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}
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#else
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/* Nothing to override on non-__linux__ platforms */
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#endif
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