xref: /kernel/liteos_a/fs/proc/src/proc_shellcmd.c (revision 0d163575) 
1/*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2022 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 *    conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 *    of conditions and the following disclaimer in the documentation and/or other materials
13 *    provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 *    to endorse or promote products derived from this software without specific prior written
17 *    permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36#include <fcntl.h>
37#include <sys/statfs.h>
38#include <errno.h>
39
40#include "los_config.h"
41
42#if defined(LOSCFG_SHELL_CMD_DEBUG) && defined(LOSCFG_FS_PROC)
43#include "los_typedef.h"
44#include "shell.h"
45#include "shcmd.h"
46#include "proc_file.h"
47#include "dirent.h"
48#include "proc_fs.h"
49
50#define WRITEPROC_ARGC  3
51
52int OsShellCmdWriteProc(int argc, char **argv)
53{
54    int i;
55    int ret;
56    const char *path = NULL;
57    const char *value = NULL;
58    unsigned int len;
59    struct ProcDirEntry *handle = NULL;
60    char realPath[PATH_MAX] = {'\0'};
61    const char *rootProcDir = "/proc/";
62
63    if (argc == WRITEPROC_ARGC) {
64        value = argv[0];
65        path = argv[2]; // 2: index of path
66        len = strlen(value) + 1;  /* + 1:add the \0 */
67        if (strncmp(argv[1], ">>", strlen(">>")) == 0) {
68            if ((realpath(path, realPath) == NULL) || (strncmp(realPath, rootProcDir, strlen(rootProcDir)) != 0)) {
69                PRINT_ERR("No such file or directory\n");
70                return PROC_ERROR;
71            }
72
73            handle = OpenProcFile(realPath, O_TRUNC);
74            if (handle == NULL) {
75                PRINT_ERR("No such file or directory\n");
76                return PROC_ERROR;
77            }
78
79            ret = WriteProcFile(handle, value, len);
80            if (ret < 0) {
81                (void)CloseProcFile(handle);
82                PRINT_ERR("write error\n");
83                return PROC_ERROR;
84            }
85            for (i = 0; i < argc; i++) {
86                PRINTK("%s%s", i > 0 ? " " : "", argv[i]);
87            }
88            PRINTK("\n");
89            (void)CloseProcFile(handle);
90            return LOS_OK;
91        }
92    }
93    PRINT_ERR("writeproc [data] [>>] [path]\n");
94    return PROC_ERROR;
95}
96
97SHELLCMD_ENTRY(writeproc_shellcmd, CMD_TYPE_EX, "writeproc", XARGS, (CmdCallBackFunc)OsShellCmdWriteProc);
98#endif
99