Page MenuHomeClusterLabs Projects
Files F4624466

No OneTemporary
Actions

View Options

diff --git a/lib/common/io.c b/lib/common/io.c
index 0fd94a519d..6efaad3ed9 100644
--- a/lib/common/io.c
+++ b/lib/common/io.c
@@ -1,353 +1,432 @@
/*
* Copyright (C) 2004 Andrew Beekhof <andrew@beekhof.net>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <crm_internal.h>
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <dirent.h>
#include <pwd.h>
#include <grp.h>
#include <crm/crm.h>
#include <crm/common/util.h>
+/*!
+ * \brief Create a directory, including any parent directories needed
+ *
+ * \param[in] path_c Pathname of the directory to create
+ * \param[in] mode Permissions to be used (with current umask) when creating
+ *
+ * \note This logs errors but does not return them to the caller.
+ */
void
crm_build_path(const char *path_c, mode_t mode)
{
int offset = 1, len = 0;
char *path = strdup(path_c);
CRM_CHECK(path != NULL, return);
for (len = strlen(path); offset < len; offset++) {
if (path[offset] == '/') {
path[offset] = 0;
if (mkdir(path, mode) < 0 && errno != EEXIST) {
crm_perror(LOG_ERR, "Could not create directory '%s'", path);
break;
}
path[offset] = '/';
}
}
if (mkdir(path, mode) < 0 && errno != EEXIST) {
crm_perror(LOG_ERR, "Could not create directory '%s'", path);
}
free(path);
}
+/*!
+ * \internal
+ * \brief Allocate and create a file path using a sequence number
+ *
+ * \param[in] directory Directory that contains the file series
+ * \param[in] series Start of file name
+ * \param[in] sequence Sequence number (MUST be less than 33 digits)
+ * \param[in] bzip Whether to use ".bz2" instead of ".raw" as extension
+ *
+ * \return Newly allocated file path, or NULL on error
+ * \note Caller is responsible for freeing the returned memory
+ */
char *
generate_series_filename(const char *directory, const char *series, int sequence, gboolean bzip)
{
int len = 40;
char *filename = NULL;
const char *ext = "raw";
CRM_CHECK(directory != NULL, return NULL);
CRM_CHECK(series != NULL, return NULL);
#if !HAVE_BZLIB_H
bzip = FALSE;
#endif
len += strlen(directory);
len += strlen(series);
filename = malloc(len);
CRM_CHECK(filename != NULL, return NULL);
if (bzip) {
ext = "bz2";
}
sprintf(filename, "%s/%s-%d.%s", directory, series, sequence, ext);
return filename;
}
+/*!
+ * \internal
+ * \brief Read and return sequence number stored in a file series' .last file
+ *
+ * \param[in] directory Directory that contains the file series
+ * \param[in] series Start of file name
+ *
+ * \return The last sequence number, or 0 on error
+ */
int
get_last_sequence(const char *directory, const char *series)
{
FILE *file_strm = NULL;
int start = 0, length = 0, read_len = 0;
char *series_file = NULL;
char *buffer = NULL;
int seq = 0;
int len = 36;
CRM_CHECK(directory != NULL, return 0);
CRM_CHECK(series != NULL, return 0);
len += strlen(directory);
len += strlen(series);
series_file = malloc(len);
CRM_CHECK(series_file != NULL, return 0);
sprintf(series_file, "%s/%s.last", directory, series);
file_strm = fopen(series_file, "r");
if (file_strm == NULL) {
crm_debug("Series file %s does not exist", series_file);
free(series_file);
return 0;
}
/* see how big the file is */
start = ftell(file_strm);
fseek(file_strm, 0L, SEEK_END);
length = ftell(file_strm);
fseek(file_strm, 0L, start);
CRM_ASSERT(length >= 0);
CRM_ASSERT(start == ftell(file_strm));
if (length <= 0) {
crm_info("%s was not valid", series_file);
free(buffer);
buffer = NULL;
} else {
crm_trace("Reading %d bytes from file", length);
buffer = calloc(1, (length + 1));
read_len = fread(buffer, 1, length, file_strm);
if (read_len != length) {
crm_err("Calculated and read bytes differ: %d vs. %d", length, read_len);
free(buffer);
buffer = NULL;
}
}
seq = crm_parse_int(buffer, "0");
fclose(file_strm);
crm_trace("Found %d in %s", seq, series_file);
free(series_file);
free(buffer);
return seq;
}
+/*!
+ * \internal
+ * \brief Write sequence number to a file series' .last file
+ *
+ * \param[in] directory Directory that contains the file series
+ * \param[in] series Start of file name
+ * \param[in] sequence Sequence number to write
+ * \param[in] max Maximum sequence value, after which sequence is reset to 0
+ *
+ * \note This function logs some errors but does not return any to the caller
+ */
void
write_last_sequence(const char *directory, const char *series, int sequence, int max)
{
int rc = 0;
int len = 36;
FILE *file_strm = NULL;
char *series_file = NULL;
CRM_CHECK(directory != NULL, return);
CRM_CHECK(series != NULL, return);
if (max == 0) {
return;
}
if (max > 0 && sequence >= max) {
sequence = 0;
}
len += strlen(directory);
len += strlen(series);
series_file = malloc(len);
- if(series_file) {
+ if (series_file) {
sprintf(series_file, "%s/%s.last", directory, series);
file_strm = fopen(series_file, "w");
}
if (file_strm != NULL) {
rc = fprintf(file_strm, "%d", sequence);
if (rc < 0) {
crm_perror(LOG_ERR, "Cannot write to series file %s", series_file);
}
} else {
crm_err("Cannot open series file %s for writing", series_file);
}
if (file_strm != NULL) {
fflush(file_strm);
fclose(file_strm);
}
crm_trace("Wrote %d to %s", sequence, series_file);
free(series_file);
}
+/*!
+ * \internal
+ * \brief Return whether a directory or file is writable by a user/group
+ *
+ * \param[in] dir Directory to check or that contains file
+ * \param[in] file File name to check (or NULL to check directory)
+ * \param[in] user Name of user that should have write permission
+ * \param[in] group Name of group that should have write permission
+ * \param[in] need_both Whether both user and group must be able to write
+ *
+ * \return TRUE if permissions match, FALSE if they don't or on error
+ */
gboolean
crm_is_writable(const char *dir, const char *file,
const char *user, const char *group, gboolean need_both)
{
int s_res = -1;
struct stat buf;
char *full_file = NULL;
const char *target = NULL;
gboolean pass = TRUE;
gboolean readwritable = FALSE;
CRM_ASSERT(dir != NULL);
if (file != NULL) {
full_file = crm_concat(dir, file, '/');
target = full_file;
s_res = stat(full_file, &buf);
if (s_res == 0 && S_ISREG(buf.st_mode) == FALSE) {
crm_err("%s must be a regular file", target);
pass = FALSE;
goto out;
}
}
if (s_res != 0) {
target = dir;
s_res = stat(dir, &buf);
if (s_res != 0) {
crm_err("%s must exist and be a directory", dir);
pass = FALSE;
goto out;
} else if (S_ISDIR(buf.st_mode) == FALSE) {
crm_err("%s must be a directory", dir);
pass = FALSE;
}
}
if (user) {
struct passwd *sys_user = NULL;
sys_user = getpwnam(user);
readwritable = (sys_user != NULL
&& buf.st_uid == sys_user->pw_uid && (buf.st_mode & (S_IRUSR | S_IWUSR)));
if (readwritable == FALSE) {
crm_err("%s must be owned and r/w by user %s", target, user);
if (need_both) {
pass = FALSE;
}
}
}
if (group) {
struct group *sys_grp = getgrnam(group);
readwritable = (sys_grp != NULL
&& buf.st_gid == sys_grp->gr_gid && (buf.st_mode & (S_IRGRP | S_IWGRP)));
if (readwritable == FALSE) {
if (need_both || user == NULL) {
pass = FALSE;
crm_err("%s must be owned and r/w by group %s", target, group);
} else {
crm_warn("%s should be owned and r/w by group %s", target, group);
}
}
}
out:
free(full_file);
return pass;
}
+/*!
+ * \internal
+ * \brief Flush and sync a directory to disk
+ *
+ * \param[in] name Directory to flush and sync
+ * \note This function logs errors but does not return them to the caller
+ */
void
crm_sync_directory(const char *name)
{
int fd;
DIR *directory;
directory = opendir(name);
if (directory == NULL) {
crm_perror(LOG_ERR, "Could not open %s for syncing", name);
return;
}
fd = dirfd(directory);
if (fd < 0) {
crm_perror(LOG_ERR, "Could not obtain file descriptor for %s", name);
return;
}
if (fsync(fd) < 0) {
crm_perror(LOG_ERR, "Could not sync %s", name);
}
if (closedir(directory) < 0) {
crm_perror(LOG_ERR, "Could not close %s after fsync", name);
}
}
+/*!
+ * \internal
+ * \brief Allocate, read and return the contents of a file
+ *
+ * \param[in] filename Name of file to read
+ *
+ * \return Newly allocated memory with contents of file, or NULL on error
+ * \note On success, the caller is responsible for freeing the returned memory;
+ * on error, errno will be 0 (indicating file was nonexistent or empty)
+ * or one of the errno values set by fopen, ftell, or calloc
+ */
char *
crm_read_contents(const char *filename)
{
char *contents = NULL;
FILE *fp;
int length, read_len;
errno = 0; /* enable caller to distinguish error from empty file */
fp = fopen(filename, "r");
if (fp == NULL) {
return NULL;
}
fseek(fp, 0L, SEEK_END);
length = ftell(fp);
if (length > 0) {
contents = calloc(length + 1, sizeof(char));
if (contents == NULL) {
fclose(fp);
return NULL;
}
crm_trace("Reading %d bytes from %s", length, filename);
rewind(fp);
read_len = fread(contents, 1, length, fp); /* Coverity: False positive */
if (read_len != length) {
free(contents);
contents = NULL;
}
}
fclose(fp);
return contents;
}
+/*!
+ * \internal
+ * \brief Write text to a file, flush and sync it to disk, then close the file
+ *
+ * \param[in] fd File descriptor opened for writing
+ * \param[in] contents String to write to file
+ *
+ * \return 0 on success, -1 on error (in which case errno will be set)
+ */
int
crm_write_sync(int fd, const char *contents)
{
int rc = 0;
FILE *fp = fdopen(fd, "w");
if (fp == NULL) {
return -1;
}
if ((contents != NULL) && (fprintf(fp, "%s", contents) < 0)) {
rc = -1;
}
if (fflush(fp) != 0) {
rc = -1;
}
if (fsync(fileno(fp)) < 0) {
rc = -1;
}
fclose(fp);
return rc;
}

File Metadata

Mime Type
text/x-diff
Expires
Tue, Jul 8, 6:24 PM (7 h, 24 s)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
2002632
Default Alt Text
(11 KB)

Event Timeline