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-rw-r--r--fsck/repair.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/fsck/repair.c b/fsck/repair.c
new file mode 100644
index 0000000..f983ee1
--- /dev/null
+++ b/fsck/repair.c
@@ -0,0 +1,295 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020 Hyunchul Lee <hyc.lee@gmail.com>
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "exfat_ondisk.h"
+#include "libexfat.h"
+#include "repair.h"
+#include "exfat_fs.h"
+#include "fsck.h"
+
+struct exfat_repair_problem {
+ er_problem_code_t prcode;
+ unsigned int flags;
+ unsigned int prompt_type;
+ unsigned int default_number;
+ unsigned int bypass_number;
+ unsigned int max_number;
+};
+
+/* Problem flags */
+#define ERF_PREEN_YES 0x00000001
+#define ERF_DEFAULT_YES 0x00000002
+#define ERF_DEFAULT_NO 0x00000004
+
+/* Prompt types */
+#define ERP_FIX 0x00000001
+#define ERP_TRUNCATE 0x00000002
+#define ERP_DELETE 0x00000003
+#define ERP_RENAME 0x00000004
+
+static const char *prompts[] = {
+ "Repair",
+ "Fix",
+ "Truncate",
+ "Delete",
+ "Select",
+};
+
+static struct exfat_repair_problem problems[] = {
+ {ER_BS_CHECKSUM, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
+ {ER_BS_BOOT_REGION, 0, ERP_FIX, 0, 0, 0},
+ {ER_DE_CHECKSUM, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
+ {ER_DE_UNKNOWN, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
+ {ER_DE_FILE, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
+ {ER_DE_SECONDARY_COUNT, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
+ {ER_DE_STREAM, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
+ {ER_DE_NAME, ERF_PREEN_YES, ERP_DELETE, 0, 0, 0},
+ {ER_DE_NAME_HASH, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
+ {ER_DE_NAME_LEN, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
+ {ER_DE_DOT_NAME, ERF_PREEN_YES, ERP_RENAME, 2, 3, 4},
+ {ER_DE_DUPLICATED_NAME, ERF_PREEN_YES, ERP_RENAME, 2, 3, 4},
+ {ER_FILE_VALID_SIZE, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
+ {ER_FILE_INVALID_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
+ {ER_FILE_FIRST_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
+ {ER_FILE_SMALLER_SIZE, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
+ {ER_FILE_LARGER_SIZE, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
+ {ER_FILE_DUPLICATED_CLUS, ERF_PREEN_YES, ERP_TRUNCATE, 0, 0, 0},
+ {ER_FILE_ZERO_NOFAT, ERF_PREEN_YES, ERP_FIX, 0, 0, 0},
+};
+
+static struct exfat_repair_problem *find_problem(er_problem_code_t prcode)
+{
+ unsigned int i;
+
+ for (i = 0; i < sizeof(problems)/sizeof(problems[0]); i++) {
+ if (problems[i].prcode == prcode) {
+ return &problems[i];
+ }
+ }
+ return NULL;
+}
+
+static int ask_repair(struct exfat_fsck *fsck, struct exfat_repair_problem *pr)
+{
+ int repair = 0;
+ char answer[8];
+
+ if (fsck->options & FSCK_OPTS_REPAIR_NO ||
+ pr->flags & ERF_DEFAULT_NO)
+ repair = 0;
+ else if (fsck->options & FSCK_OPTS_REPAIR_YES ||
+ pr->flags & ERF_DEFAULT_YES)
+ repair = 1;
+ else {
+ if (fsck->options & FSCK_OPTS_REPAIR_ASK) {
+ do {
+ if (pr->prompt_type & ERP_RENAME) {
+ printf("%s (Number: ?) ",
+ prompts[pr->prompt_type]);
+ } else {
+ printf(". %s (y/N)? ",
+ prompts[pr->prompt_type]);
+ }
+ fflush(stdout);
+
+ if (!fgets(answer, sizeof(answer), stdin))
+ continue;
+
+ if (pr->prompt_type & ERP_RENAME) {
+ unsigned int number = atoi(answer);
+
+ if (number > 0 && number < pr->max_number)
+ return number;
+ } else {
+ if (strcasecmp(answer, "Y\n") == 0)
+ return 1;
+ else if (strcasecmp(answer, "\n") == 0 ||
+ strcasecmp(answer, "N\n") == 0)
+ return 0;
+ }
+ } while (1);
+ } else if (fsck->options & FSCK_OPTS_REPAIR_AUTO &&
+ pr->flags & ERF_PREEN_YES)
+ repair = 1;
+ }
+
+ if (pr->prompt_type & ERP_RENAME) {
+ int print_num = repair ? pr->default_number : pr->bypass_number;
+
+ printf("%s (Number : %d)\n", prompts[pr->prompt_type],
+ print_num);
+ repair = print_num;
+ } else {
+ printf(". %s (y/N)? %c\n", prompts[pr->prompt_type],
+ repair ? 'y' : 'n');
+ }
+ return repair;
+}
+
+int exfat_repair_ask(struct exfat_fsck *fsck, er_problem_code_t prcode,
+ const char *desc, ...)
+{
+ struct exfat_repair_problem *pr = NULL;
+ va_list ap;
+ int repair;
+
+ pr = find_problem(prcode);
+ if (!pr) {
+ exfat_err("unknown problem code. %#x\n", prcode);
+ return 0;
+ }
+
+ va_start(ap, desc);
+ vprintf(desc, ap);
+ va_end(ap);
+
+ repair = ask_repair(fsck, pr);
+ if (repair) {
+ if (pr->prompt_type & ERP_TRUNCATE)
+ fsck->dirty_fat = true;
+ fsck->dirty = true;
+ }
+ return repair;
+}
+
+static int check_bad_char(char w)
+{
+ return (w < 0x0020) || (w == '*') || (w == '?') || (w == '<') ||
+ (w == '>') || (w == '|') || (w == '"') || (w == ':') ||
+ (w == '/') || (w == '\\');
+}
+
+static char *get_rename_from_user(struct exfat_de_iter *iter)
+{
+ char *rename = malloc(ENTRY_NAME_MAX + 2);
+
+ if (!rename)
+ return NULL;
+
+retry:
+ /* +2 means LF(Line Feed) and NULL terminator */
+ memset(rename, 0x1, ENTRY_NAME_MAX + 2);
+ printf("New name: ");
+ if (fgets(rename, ENTRY_NAME_MAX + 2, stdin)) {
+ int i, len, err;
+ struct exfat_lookup_filter filter;
+
+ len = strlen(rename);
+ /* Remove LF in filename */
+ rename[len - 1] = '\0';
+ for (i = 0; i < len - 1; i++) {
+ if (check_bad_char(rename[i])) {
+ printf("filename contain invalid character(%c)\n", rename[i]);
+ goto retry;
+ }
+ }
+
+ exfat_de_iter_flush(iter);
+ err = exfat_lookup_file(iter->exfat, iter->parent, rename, &filter);
+ if (!err) {
+ printf("file(%s) already exists, retry to insert name\n", rename);
+ goto retry;
+ }
+ }
+
+ return rename;
+}
+
+static char *generate_rename(struct exfat_de_iter *iter)
+{
+ char *rename;
+
+ if (iter->invalid_name_num > INVALID_NAME_NUM_MAX)
+ return NULL;
+
+ rename = malloc(ENTRY_NAME_MAX + 1);
+ if (!rename)
+ return NULL;
+
+ while (1) {
+ struct exfat_lookup_filter filter;
+ int err;
+
+ snprintf(rename, ENTRY_NAME_MAX + 1, "FILE%07d.CHK",
+ iter->invalid_name_num++);
+ err = exfat_lookup_file(iter->exfat, iter->parent, rename,
+ &filter);
+ if (!err)
+ continue;
+ break;
+ }
+
+ return rename;
+}
+
+int exfat_repair_rename_ask(struct exfat_fsck *fsck, struct exfat_de_iter *iter,
+ char *old_name, er_problem_code_t prcode, char *error_msg)
+{
+ int num;
+
+ask_again:
+ num = exfat_repair_ask(fsck, prcode, "ERROR: '%s' %s.\n%s",
+ old_name, error_msg,
+ " [1] Insert the name you want to rename.\n"
+ " [2] Automatically renames filename.\n"
+ " [3] Bypass this check(No repair)\n");
+ if (num) {
+ __le16 utf16_name[ENTRY_NAME_MAX];
+ char *rename = NULL;
+ __u16 hash;
+ struct exfat_dentry *dentry;
+ int ret, i;
+
+ switch (num) {
+ case 1:
+ rename = get_rename_from_user(iter);
+ break;
+ case 2:
+ rename = generate_rename(iter);
+ break;
+ case 3:
+ break;
+ default:
+ exfat_info("select 1 or 2 number instead of %d\n", num);
+ goto ask_again;
+ }
+
+ if (!rename)
+ return -EINVAL;
+
+ exfat_info("%s filename is renamed to %s\n", old_name, rename);
+
+ exfat_de_iter_get_dirty(iter, 2, &dentry);
+
+ memset(utf16_name, 0, sizeof(utf16_name));
+ ret = exfat_utf16_enc(rename, utf16_name, sizeof(utf16_name));
+ free(rename);
+ if (ret < 0)
+ return ret;
+
+ ret >>= 1;
+ memcpy(dentry->name_unicode, utf16_name, ENTRY_NAME_MAX * 2);
+ hash = exfat_calc_name_hash(iter->exfat, utf16_name, ret);
+ exfat_de_iter_get_dirty(iter, 1, &dentry);
+ dentry->stream_name_len = (__u8)ret;
+ dentry->stream_name_hash = cpu_to_le16(hash);
+
+ exfat_de_iter_get_dirty(iter, 0, &dentry);
+ i = dentry->file_num_ext;
+ dentry->file_num_ext = 2;
+
+ for (; i > 2; i--) {
+ exfat_de_iter_get_dirty(iter, i, &dentry);
+ dentry->type &= EXFAT_DELETE;
+ }
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-02 02:44:35 +0000