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/*-*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Monkey HTTP Server
* ==================
* Copyright 2001-2017 Eduardo Silva <eduardo@monkey.io>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "mk_core.h"
#ifdef _WIN32
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#define S_ISLNK(m) (0)
#define O_NONBLOCK (0)
#define lstat stat
#endif
int mk_file_get_info(const char *path, struct file_info *f_info, int mode)
{
struct stat f, target;
f_info->exists = MK_FALSE;
/* Stat right resource */
if (lstat(path, &f) == -1) {
if (errno == EACCES) {
f_info->exists = MK_TRUE;
}
return -1;
}
f_info->exists = MK_TRUE;
f_info->is_file = MK_TRUE;
f_info->is_link = MK_FALSE;
f_info->is_directory = MK_FALSE;
f_info->exec_access = MK_FALSE;
f_info->read_access = MK_FALSE;
if (S_ISLNK(f.st_mode)) {
f_info->is_link = MK_TRUE;
f_info->is_file = MK_FALSE;
if (stat(path, &target) == -1) {
return -1;
}
}
else {
target = f;
}
f_info->size = target.st_size;
f_info->last_modification = target.st_mtime;
if (S_ISDIR(target.st_mode)) {
f_info->is_directory = MK_TRUE;
f_info->is_file = MK_FALSE;
}
#ifndef _WIN32
gid_t EGID = getegid();
gid_t EUID = geteuid();
/* Check read access */
if (mode & MK_FILE_READ) {
if (((target.st_mode & S_IRUSR) && target.st_uid == EUID) ||
((target.st_mode & S_IRGRP) && target.st_gid == EGID) ||
(target.st_mode & S_IROTH)) {
f_info->read_access = MK_TRUE;
}
}
/* Checking execution */
if (mode & MK_FILE_EXEC) {
if ((target.st_mode & S_IXUSR && target.st_uid == EUID) ||
(target.st_mode & S_IXGRP && target.st_gid == EGID) ||
(target.st_mode & S_IXOTH)) {
f_info->exec_access = MK_TRUE;
}
}
#endif
/* Suggest open(2) flags */
f_info->flags_read_only = O_RDONLY | O_NONBLOCK;
#if defined(__linux__)
/*
* If the user is the owner of the file or the user is root, it
* can set the O_NOATIME flag for open(2) operations to avoid
* inode updates about last accessed time
*/
if (target.st_uid == EUID || EUID == 0) {
f_info->flags_read_only |= O_NOATIME;
}
#endif
return 0;
}
/* Read file content to a memory buffer,
* Use this function just for really SMALL files
*/
char *mk_file_to_buffer(const char *path)
{
FILE *fp;
char *buffer;
long bytes;
struct file_info finfo;
if (mk_file_get_info(path, &finfo, MK_FILE_READ) != 0) {
return NULL;
}
if (!(fp = fopen(path, "rb"))) {
return NULL;
}
buffer = mk_mem_alloc_z(finfo.size + 1);
if (!buffer) {
fclose(fp);
return NULL;
}
bytes = fread(buffer, finfo.size, 1, fp);
if (bytes < 1) {
mk_mem_free(buffer);
fclose(fp);
return NULL;
}
fclose(fp);
return (char *) buffer;
}
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