1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2020 Hyunchul Lee <hyc.lee@gmail.com>
4 */
5 #include <stdio.h>
6 #include <string.h>
7 #include <stdarg.h>
8 #include <stdlib.h>
9
10 #include "exfat_ondisk.h"
11 #include "libexfat.h"
12 #include "repair.h"
13 #include "exfat_fs.h"
14 #include "exfat_dir.h"
15 #include "fsck.h"
16
17 struct exfat_repair_problem {
18 er_problem_code_t prcode;
19 unsigned int flags;
20 unsigned int prompt_type;
21 unsigned int default_number;
22 unsigned int bypass_number;
23 unsigned int max_number;
24 };
25
26 /* Problem flags */
27 #define ERF_PREEN_YES 0x00000001
28 #define ERF_DEFAULT_YES 0x00000002
29 #define ERF_DEFAULT_NO 0x00000004
30
31 /* Prompt types */
32 #define ERP_FIX 0x00000001
33 #define ERP_TRUNCATE 0x00000002
34 #define ERP_DELETE 0x00000003
35 #define ERP_RENAME 0x00000004
36
37 static const char *prompts[] = {
38 "Repair",
39 "Fix",
40 "Truncate",
41 "Delete",
42 "Select",
43 };
44
45 static struct exfat_repair_problem problems[] = {
46 {ER_BS_CHECKSUM, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
47 {ER_BS_BOOT_REGION, 0, ERP_FIX, 0, 0, 0},
48 {ER_DE_CHECKSUM, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
49 {ER_DE_UNKNOWN, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
50 {ER_DE_FILE, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
51 {ER_DE_SECONDARY_COUNT, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
52 {ER_DE_STREAM, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
53 {ER_DE_NAME, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
54 {ER_DE_NAME_HASH, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
55 {ER_DE_NAME_LEN, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
56 {ER_DE_DOT_NAME, ERF_PREEN_YES, ERP_RENAME, 2, 3, 4},
57 {ER_FILE_VALID_SIZE, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
58 {ER_FILE_INVALID_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
59 {ER_FILE_FIRST_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
60 {ER_FILE_SMALLER_SIZE, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
61 {ER_FILE_LARGER_SIZE, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
62 {ER_FILE_DUPLICATED_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
63 {ER_FILE_ZERO_NOFAT, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
64 };
65
find_problem(er_problem_code_t prcode)66 static struct exfat_repair_problem *find_problem(er_problem_code_t prcode)
67 {
68 unsigned int i;
69
70 for (i = 0; i < sizeof(problems)/sizeof(problems[0]); i++) {
71 if (problems[i].prcode == prcode) {
72 return &problems[i];
73 }
74 }
75 return NULL;
76 }
77
ask_repair(struct exfat_fsck * fsck,struct exfat_repair_problem * pr)78 static int ask_repair(struct exfat_fsck *fsck, struct exfat_repair_problem *pr)
79 {
80 int repair = 0;
81 char answer[8];
82
83 if (fsck->options & FSCK_OPTS_REPAIR_NO ||
84 pr->flags & ERF_DEFAULT_NO)
85 repair = 0;
86 else if (fsck->options & FSCK_OPTS_REPAIR_YES ||
87 pr->flags & ERF_DEFAULT_YES)
88 repair = 1;
89 else {
90 if (fsck->options & FSCK_OPTS_REPAIR_ASK) {
91 do {
92 if (pr->prompt_type & ERP_RENAME) {
93 printf("%s (Number: ?) ",
94 prompts[pr->prompt_type]);
95 } else {
96 printf(". %s (y/N)? ",
97 prompts[pr->prompt_type]);
98 }
99 fflush(stdout);
100
101 if (!fgets(answer, sizeof(answer), stdin))
102 continue;
103
104 if (pr->prompt_type & ERP_RENAME) {
105 unsigned int number = atoi(answer);
106
107 if (number > 0 && number < pr->max_number)
108 return number;
109 } else {
110 if (strcasecmp(answer, "Y\n") == 0)
111 return 1;
112 else if (strcasecmp(answer, "\n") == 0 ||
113 strcasecmp(answer, "N\n") == 0)
114 return 0;
115 }
116 } while (1);
117 } else if (fsck->options & FSCK_OPTS_REPAIR_AUTO &&
118 pr->flags & ERF_PREEN_YES)
119 repair = 1;
120 }
121
122 if (pr->prompt_type & ERP_RENAME) {
123 int print_num = repair ? pr->default_number : pr->bypass_number;
124
125 printf("%s (Number : %d)\n", prompts[pr->prompt_type],
126 print_num);
127 repair = print_num;
128 } else {
129 printf(". %s (y/N)? %c\n", prompts[pr->prompt_type],
130 repair ? 'y' : 'n');
131 }
132 return repair;
133 }
134
exfat_repair_ask(struct exfat_fsck * fsck,er_problem_code_t prcode,const char * desc,...)135 int exfat_repair_ask(struct exfat_fsck *fsck, er_problem_code_t prcode,
136 const char *desc, ...)
137 {
138 struct exfat_repair_problem *pr = NULL;
139 va_list ap;
140 int repair;
141
142 pr = find_problem(prcode);
143 if (!pr) {
144 exfat_err("unknown problem code. %#x\n", prcode);
145 return 0;
146 }
147
148 va_start(ap, desc);
149 vprintf(desc, ap);
150 va_end(ap);
151
152 repair = ask_repair(fsck, pr);
153 if (repair) {
154 if (pr->prompt_type & ERP_TRUNCATE)
155 fsck->dirty_fat = true;
156 fsck->dirty = true;
157 }
158 return repair;
159 }
160