1 /*
2 * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification,
5 * are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice, this list of
8 * conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
11 * of conditions and the following disclaimer in the documentation and/or other materials
12 * provided with the distribution.
13 *
14 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific prior written
16 * permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "proc_fs.h"
32
33 #include <stdbool.h>
34 #include "fs/file.h"
35 #include "vfs_config.h"
36 #include "internal.h"
37
38 #include "fs/fd_table.h"
39 #include "los_process.h"
40 #include "capability_api.h"
41 #include "capability_type.h"
42
43
44 /*
45 * Template: Pid Fd [SysFd ] Name
46 */
FillFdInfo(struct SeqBuf * seqBuf,struct filelist * fileList,unsigned int pid,bool hasPrivilege)47 static void FillFdInfo(struct SeqBuf *seqBuf, struct filelist *fileList, unsigned int pid, bool hasPrivilege)
48 {
49 int fd;
50 int sysFd;
51 char *name = NULL;
52 struct file *filp = NULL;
53
54 struct fd_table_s *fdt = LOS_GetFdTable(pid);
55 if ((fdt == NULL) || (fdt->proc_fds == NULL)) {
56 return;
57 }
58
59 (void)sem_wait(&fdt->ft_sem);
60
61 for (fd = MIN_START_FD; fd < fdt->max_fds; fd++) {
62 if (FD_ISSET(fd, fdt->proc_fds)) {
63 sysFd = fdt->ft_fds[fd].sysFd;
64 if (sysFd < CONFIG_NFILE_DESCRIPTORS) {
65 filp = &fileList->fl_files[sysFd];
66 name = filp->f_path;
67 } else if (sysFd < (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)) {
68 name = "(socks)";
69 } else if (sysFd < (FD_SETSIZE + CONFIG_NTIME_DESCRIPTORS)) {
70 name = "(timer)";
71 } else if (sysFd < (MQUEUE_FD_OFFSET + CONFIG_NQUEUE_DESCRIPTORS)) {
72 name = "(mqueue)";
73 } else if (sysFd < (EPOLL_FD_OFFSET + CONFIG_EPOLL_DESCRIPTORS)) {
74 name = "(epoll)";
75 } else {
76 name = "(unknown)";
77 }
78
79 if (hasPrivilege) {
80 (void)LosBufPrintf(seqBuf, "%u\t%d\t%6d <%d>\t%s\n", pid, fd, sysFd, filp ? filp->f_refcount : 1, name);
81 } else {
82 (void)LosBufPrintf(seqBuf, "%u\t%d\t%s\n", pid, fd, name);
83 }
84 }
85 }
86
87 (void)sem_post(&fdt->ft_sem);
88 }
89
FdProcFill(struct SeqBuf * seqBuf,void * v)90 static int FdProcFill(struct SeqBuf *seqBuf, void *v)
91 {
92 int pidNum;
93 bool hasPrivilege;
94 unsigned int pidMaxNum;
95 unsigned int *pidList = NULL;
96
97 /* privilege user */
98 if (IsCapPermit(CAP_DAC_READ_SEARCH)) {
99 pidMaxNum = LOS_GetSystemProcessMaximum();
100 pidList = (unsigned int *)malloc(pidMaxNum * sizeof(unsigned int));
101 if (pidList == NULL) {
102 return -ENOMEM;
103 }
104 pidNum = LOS_GetUsedPIDList(pidList, pidMaxNum);
105 hasPrivilege = true;
106 (void)LosBufPrintf(seqBuf, "%s\t%s\t%6s %s\t%s\n", "Pid", "Fd", "SysFd", "<ref>", "Name");
107 } else {
108 pidNum = 1;
109 pidList = (unsigned int *)malloc(pidNum * sizeof(unsigned int));
110 if (pidList == NULL) {
111 return -ENOMEM;
112 }
113 pidList[0] = LOS_GetCurrProcessID();
114 hasPrivilege = false;
115 (void)LosBufPrintf(seqBuf, "Pid\tFd\tName\n");
116 }
117
118 struct filelist *fileList = &tg_filelist;
119 (void)sem_wait(&fileList->fl_sem);
120
121 for (int i = 0; i < pidNum; i++) {
122 FillFdInfo(seqBuf, fileList, pidList[i], hasPrivilege);
123 }
124
125 free(pidList);
126 (void)sem_post(&fileList->fl_sem);
127 return 0;
128 }
129
130 static const struct ProcFileOperations FD_PROC_FOPS = {
131 .read = FdProcFill,
132 };
133
ProcFdInit(void)134 void ProcFdInit(void)
135 {
136 struct ProcDirEntry *pde = CreateProcEntry("fd", 0, NULL);
137 if (pde == NULL) {
138 PRINT_ERR("create /proc/fd error.\n");
139 return;
140 }
141
142 pde->procFileOps = &FD_PROC_FOPS;
143 }
144
145