-/*
- * lxc: linux Container library
- *
- * (C) Copyright IBM Corp. 2007, 2008
- *
- * Authors:
- * Daniel Lezcano <daniel.lezcano at free.fr>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#define _GNU_SOURCE
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "config.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <limits.h>
#include <stdio.h>
-#undef _GNU_SOURCE
-#include <string.h>
#include <stdlib.h>
-#include <errno.h>
-#include <dirent.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/sendfile.h>
+#include "file_utils.h"
+#include "log.h"
+#include "macro.h"
#include "parse.h"
-#include "config.h"
+#include "syscall_wrappers.h"
#include "utils.h"
-#include "log.h"
-lxc_log_define(lxc_parse, lxc);
+lxc_log_define(parse, lxc);
+
+void *lxc_strmmap(void *addr, size_t length, int prot, int flags, int fd,
+ off_t offset)
+{
+ void *tmp = NULL, *overlap = NULL;
+
+ /* We establish an anonymous mapping that is one byte larger than the
+ * underlying file. The pages handed to us are zero filled. */
+ tmp = mmap(addr, length + 1, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (tmp == MAP_FAILED)
+ return tmp;
+
+ /* Now we establish a fixed-address mapping starting at the address we
+ * received from our anonymous mapping and replace all bytes excluding
+ * the additional \0-byte with the file. This allows us to use normal
+ * string-handling functions. */
+ overlap = mmap(tmp, length, prot, MAP_FIXED | flags, fd, offset);
+ if (overlap == MAP_FAILED)
+ munmap(tmp, length + 1);
+
+ return overlap;
+}
+
+int lxc_strmunmap(void *addr, size_t length)
+{
+ return munmap(addr, length + 1);
+}
+
+int lxc_file_for_each_line_mmap(const char *file, lxc_file_cb callback, void *data)
+{
+ __do_close int fd = -EBADF, memfd = -EBADF;
+ ssize_t ret = -1;
+ char *buf = NULL;
+ struct stat st = {};
+ ssize_t bytes;
+ char *line;
+
+ memfd = memfd_create(".lxc_config_file", MFD_CLOEXEC);
+ if (memfd < 0) {
+ char template[] = P_tmpdir "/.lxc_config_file_XXXXXX";
+
+ if (errno != ENOSYS) {
+ SYSERROR("Failed to create memory file");
+ goto on_error;
+ }
+
+ TRACE("Failed to create in-memory file. Falling back to temporary file");
+ memfd = lxc_make_tmpfile(template, true);
+ if (memfd < 0) {
+ SYSERROR("Failed to create temporary file \"%s\"", template);
+ goto on_error;
+ }
+ }
+
+ fd = open(file, O_RDONLY | O_CLOEXEC);
+ if (fd < 0) {
+ SYSERROR("Failed to open file \"%s\"", file);
+ goto on_error;
+ }
+
+ ret = fstat(fd, &st);
+ if (ret) {
+ SYSERROR("Failed to stat file \"%s\"", file);
+ goto on_error;
+ }
+
+ if (st.st_size > INT_MAX) {
+ SYSERROR("Excessively large config file \"%s\"", file);
+ goto on_error;
+ }
+
+
+ bytes = __fd_to_fd(fd, memfd);
+ if (bytes < 0) {
+ SYSERROR("Failed to copy config file \"%s\"", file);
+ goto on_error;
+ }
+
+ ret = lxc_write_nointr(memfd, "\0", 1);
+ if (ret < 0) {
+ SYSERROR("Failed to append zero byte");
+ goto on_error;
+ }
+ bytes++;
+
+ ret = lseek(memfd, 0, SEEK_SET);
+ if (ret < 0) {
+ SYSERROR("Failed to lseek");
+ goto on_error;
+ }
+
+ ret = -1;
+ buf = mmap(NULL, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_POPULATE, memfd, 0);
+ if (buf == MAP_FAILED) {
+ buf = NULL;
+ SYSERROR("Failed to mmap");
+ goto on_error;
+ }
+
+ ret = 0;
+ lxc_iterate_parts(line, buf, "\r\n\0") {
+ ret = callback(line, data);
+ if (ret) {
+ /* Callback rv > 0 means stop here callback rv < 0 means
+ * error.
+ */
+ if (ret < 0)
+ ERROR("Failed to parse config file \"%s\" at line \"%s\"",
+ file, line);
+ break;
+ }
+ }
+
+on_error:
+ if (buf && munmap(buf, bytes)) {
+ SYSERROR("Failed to unmap");
+ if (ret == 0)
+ ret = -1;
+ }
+
+ return ret;
+}
int lxc_file_for_each_line(const char *file, lxc_file_cb callback, void *data)
{
- FILE *f;
+ __do_fclose FILE *f = NULL;
+ __do_free char *line = NULL;
int err = 0;
- char *line = NULL;
size_t len = 0;
- f = fopen(file, "r");
+ f = fopen(file, "re");
if (!f) {
- SYSERROR("failed to open %s", file);
+ SYSERROR("Failed to open \"%s\"", file);
return -1;
}
* error.
*/
if (err < 0)
- ERROR("Failed to parse config: %s", line);
+ ERROR("Failed to parse config: \"%s\"", line);
break;
}
}
- free(line);
- fclose(f);
return err;
}
-
-int lxc_char_left_gc(const char *buffer, size_t len)
-{
- size_t i;
- for (i = 0; i < len; i++) {
- if (buffer[i] == ' ' ||
- buffer[i] == '\t')
- continue;
- return i;
- }
- return 0;
-}
-
-int lxc_char_right_gc(const char *buffer, size_t len)
-{
- int i;
- for (i = len - 1; i >= 0; i--) {
- if (buffer[i] == ' ' ||
- buffer[i] == '\t' ||
- buffer[i] == '\n' ||
- buffer[i] == '\0')
- continue;
- return i + 1;
- }
- return 0;
-}
-
-int lxc_is_line_empty(const char *line)
-{
- int i;
- size_t len = strlen(line);
-
- for (i = 0; i < len; i++)
- if (line[i] != ' ' && line[i] != '\t' &&
- line[i] != '\n' && line[i] != '\r' &&
- line[i] != '\f' && line[i] != '\0')
- return 0;
- return 1;
-}
projects / mirror_lxc.git / blobdiff