Difference between revisions of "NCM services"
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=== IContentMetaDatabase === | === IContentMetaDatabase === | ||
This is "nn::ncm::IContentMetaDatabase". | This is "nn::ncm::IContentMetaDatabase". | ||
+ | |||
+ | Note the official name for Meta Record is "ContentMetaKey". | ||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
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| 4 || ReadEntryContentRecordEntries || Takes a type-6 buffer to write [[NCA#Content_records|Content Record]] entries to, a [[NCA#Meta_records|Meta Record]], and a u32 index into the Content Record entries to start copying from. Returns a u32 entries_read. | | 4 || ReadEntryContentRecordEntries || Takes a type-6 buffer to write [[NCA#Content_records|Content Record]] entries to, a [[NCA#Meta_records|Meta Record]], and a u32 index into the Content Record entries to start copying from. Returns a u32 entries_read. | ||
|- | |- | ||
− | | 5 || | + | | 5 || List || Takes a type-6 buffer to write [[NCA#Meta_records|Meta Record]]s to, a u32 [[#Title_Types|Title Type]], a u64 TID, a u64 TID_LOW, and u64 TID_HIGH. Writes into the buffer all Meta Records with low <= record->title_id <= high, and record->type == type. Additionally requires record->title_id == TID, if record->type is Application, Patch, Add-On, or Delta. |
|- | |- | ||
| 6 || GetMetaRecord || Takes a u64 title id, and returns the [[NCA#Meta_records|Meta Record]] with the highest version field for that title id. | | 6 || GetMetaRecord || Takes a u64 title id, and returns the [[NCA#Meta_records|Meta Record]] with the highest version field for that title id. | ||
|- | |- | ||
− | | 7 || [[# | + | | 7 || [[#ListApplication]] || |
|- | |- | ||
| 8 || IsEntryPresent || Takes a [[NCA#Meta_records|Meta Record]] and returns whether that record is present in the database. | | 8 || IsEntryPresent || Takes a [[NCA#Meta_records|Meta Record]] and returns whether that record is present in the database. | ||
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− | ==== | + | ==== ListApplication ==== |
− | Each 24-byte entry is as follows: | + | Each 24-byte entry (officially "ApplicationContentMetaKey") is as follows: |
[[NCA#Meta_records|meta_record]] meta_record; | [[NCA#Meta_records|meta_record]] meta_record; | ||
u64 base_title_id; | u64 base_title_id; |
Revision as of 07:04, 9 February 2018
NCM contains services for internal file path and content management.
Location Resolver services
lr
This is "nn::lr::ILocationResolverManager".
Cmd | Name | Arguments | Notes |
---|---|---|---|
0 | GetLocationResolver | StorageID | |
1 | GetRegisteredLocationResolver | None | |
2 | CheckStorage | StorageID | |
3 | GetAddOnContentLocationResolver | None |
The only sysmodules which use this service are FS, Loader, and NS. boot2 has access but doesn't use it.
ILocationResolver
This is "nn::lr::ILocationResolver".
Cmd | Name | Arguments | Notes |
---|---|---|---|
0 | GetProgramNcaPath | u64 TID + C descriptor | Used for NCA-type1. |
1 | SetProgramNcaPath | u64 TID + X descriptor ContentPath | Used for NCA-type1. |
2 | GetUserControlNcaPath | u64 TID + C descriptor | Used for NCA-type3 (gamecard only?). |
3 | GetDocHtmlNcaPath | u64 TID + C descriptor | Used for NCA-type4. |
4 | GetControlNcaPath | u64 TID + C descriptor | Used for NCA-type3. Stubbed, only returns error 0x608. |
5 | SetControlNcaPath | u64 TID + X descriptor ContentPath | Used for NCA-type3. |
6 | SetDocHtmlNcaPath | u64 TID + X descriptor ContentPath | Used for NCA-type4. |
7 | GetInfoHtmlNcaPath | u64 TID + C descriptor | Used for NCA-type5. |
8 | SetInfoHtmlNcaPath | u64 TID + X descriptor ContentPath | Used for NCA-type5. |
9 | ClearLocationResolver | None | Clears all NCA paths set. |
These get-commands load the ContentPath from linked-lists in memory using the input titleID. The set-commands add a new entry to the list, if a matching entry is found it's removed first. ClearLocationResolver frees all entries in all of these linked-lists. The ContentPath is only used with memcpy() here with size=0x300, nothing more.
The set commands always return 0. When the get-commands fail to find an entry for the specified titleID, 0x408 is returned for GetProgramNcaPath, while the rest of the commands return 0xA08.
IRegisteredLocationResolver
This is "nn::lr::IRegisteredLocationResolver".
This works like #ILocationResolver, but only two types of NCA paths can be gotten/set. In addition, each type has a fallback path that can be set for a single title ID at a time.
Cmd | Name | Arguments | Notes |
---|---|---|---|
0 | GetPatchType0NcaPath | u64 TID + C descriptor | Used for NCA-type1. |
1 | RegisterPatchType0FallbackPath | u64 TID + X descriptor ContentPath | Sets the Type 0 fallback TID and path to the provided arguments. |
2 | UnregisterPatchType0FallbackPath | u64 TID | If the Type 0 fallback TID is == argument TID, unregisters the fallback path. Otherwise, noop. |
3 | SetPatchType0NcaPath | u64 TID + X descriptor ContentPath | |
(2.0.0+) 4 | GetPatchType1NcaPath | u64 TID + C descriptor | |
(2.0.0+) 5 | RegisterPatchType1FallbackPath | u64 TID + X descriptor ContentPath | Sets the Type 1 fallback TID and path to the provided arguments. |
(2.0.0+) 6 | UnregisterPatchType1FallbackPath | u64 TID | If the Type 1 fallback TID is == argument TID, unregisters the fallback path. Otherwise, noop. |
(2.0.0+) 7 | SetPatchType1NcaPath | u64 TID + X descriptor ContentPath |
IAddOnContentLocationResolver
This is "nn::lr::IAddOnContentLocationResolver".
Cmd | Name | Arguments | Notes |
---|---|---|---|
0 | GetAddOnContentNcaPath | u64 TID + C descriptor | |
1 | RegisterAddOnContent | StorageID + u64 TID | |
2 | ClearAddOnContentLocationResolver | None | Clears all registered titles here. |
Content Manager services
ncm
This is "nn::ncm::IContentManager".
Cmd | Name | Notes |
---|---|---|
0 | CreatePlaceholderAndRegisteredDirectoriesForMediaId | Takes a StorageID. |
1 | CreateSaveDataDirectoryForMediaId | Takes a StorageID. |
2 | GetExistsPlaceholderAndRegisteredDirectoriesForMediaId | Takes a StorageID. |
3 | GetExistsSaveDataDirectoryForMediaId | Takes a StorageID. |
4 | GetIContentStorage | Takes a StorageID. |
5 | GetIContentMetaDatabase | Takes a StorageID. |
(1.0.0) 6 | CloseAndLockIContentStorage | Takes a StorageID. Calls IContentStorage->CloseAndFlushStorage(). |
(1.0.0) 7 | CloseAndLockIContentMetaDatabase | Takes a StorageID. Calls IContentMetaDatabase->CloseMetaDatabase(). |
8 | DeleteSaveDataForMediaId | Takes a StorageID, and deletes the associated savedata. |
(2.0.0+?) 9 | MountStorageForMediaId | |
(2.0.0+?) 10 | UnmountStorageForMediaId | |
(2.0.0+?) 11 | MountDatabaseForMediaId | |
(2.0.0+?) 12 | UnmountDatabaseForMediaId |
All of the above cmds takes a u8 as input.
IContentStorage
This is "nn::ncm::IContentStorage".
Cmd | Name | Notes |
---|---|---|
0 | #GetUUID | Returns a random UUID for the Content Storage. |
1 | CreatePlaceholderEntryAndRegisteredDirectoryEntry | Takes two #NcaIDs, and a u64 filesize. |
2 | DeletePlaceholderEntry | Takes a #NcaID. |
3 | DoesPlaceholderEntryExist | Takes a #NcaID. |
4 | WritePlaceholderEntry | Takes a #NcaID, a u64-offset, and type 5 buffer. Writes the buffer to the file for the NcaID's placeholder path at the specified offset. |
5 | MovePlaceholderToRegistered | Takes two #NcaIDs, moves the Placeholder NCA content to the registered NCA path. |
6 | DeleteRegisteredEntry | Takes a #NcaID. |
7 | DoesRegisteredEntryExist | Takes a #NcaID. |
8 | GetPathForRegisteredEntry | Takes a #NcaID. Returns a Content Path. |
9 | GetPathForPlaceholderEntry | Takes a #NcaID. Returns a Content Path. |
10 | CleanPlaceholderDirectory | Deletes and re-creates the Placeholder directory. |
11 | GetNumberOfRegisteredEntries | This is like #GetRegisteredEntries, but for the Placeholder directory. |
12 | #GetNumberOfRegisteredEntries | |
13 | #GetRegisteredEntries | |
14 | #GetRegisteredEntrySize | |
15 | CloseAndFlushStorage | Closes/Flushes all resources for the storage, and causes all future IPC commands to the current session to return error 0xC805. |
16 | Takes three 0x10-sized entries. | |
17 | SetPlaceholderEntrySize | Takes a #NcaID, and a u64 size |
18 | #ReadRegisteredEntryRaw | |
19 | GetPlaceholderEntryRightsID | Gets the Rights ID for the #NcaID's placeholder path. |
20 | GetRegisteredEntryRightsID | Gets the Rights ID for the #NcaID's registered path |
21 | WriteRegisteredPathForDebug | Takes a #NcaID, a u64 offset, and a type 5 buffer. On debug units, writes the buffer to the NCA's registered path. On retail units, this just aborts. |
22 | GetFreeSpace | Gets free space for the storage. |
23 | GetTotalSpace | Gets total space for the storage. |
24 | FlushStorage | Flushes resources for the storage without closing it. |
GetUUID
Calls nn::util::GenerateUuid(), which internally calls nn::os::GenerateRandomBytes(16);
GetNumberOfRegisteredEntries
Writes the total number of entries which can be read by GetEntries, to cmdreply <SFCO_offset>+0x10.
GetRegisteredEntries
Takes an output buffer, u32 offset and gets all entries starting at that offset. Returns number of entries read.
Each entry is a #NcaID.
The total read entries is exactly the same as the number of "<hex>.nca" directories in the storage FS(or at least under the "registered" directory?).
GetRegisteredEntrySize
Takes a #NcaID as input.
Returns the total size readable by ReadEntryRaw. This is the same as the size-field in the NAX0 "<NcaID>.nca/00" file.
ReadRegisteredEntryRaw
Takes an output buffer, a #NcaID as input, and a u64 file offset.
Returns encrypted looking data from the content in the NAX0. Doesn't match the encrypted raw data in the NAX0 "<NcaID>.nca/00" file. Seems to be at least one crypto layer below the initial NAX0 layer, since the data doesn't change after NAX0 recreation.
Manually modifying the content in the NAX0(starting at offset 0x4000) results in different output data being returned by this cmd. Changing any data within the first 0x10-bytes results in the entire 0x10-byte block changing. Likewise for offset 0x4010 size 0x1, entire 0x10-byte block at 0x4010 changes. Changing the first 0x20-bytes at 0x4000 to zeros has the same combined changed output, as when offset 0x4000 size 0x10 and offset 0x4010 size 0x10 were changed to zeros separately. Output BlockA and BlockB are completely different, where the raw NAX0 data for those blocks are all-zero.
Overwriting the entire raw NAX0 content with zeros results in output data which doesn't seem to have any duplicate blocks/data. When changing the previously mentioned raw content for the first 8 blocks to last-block-byte = 1<<i, where i is 0-7, none of the changed output blocks match any output blocks from the previously mentioned output(all-zero raw content).
This implies that that an AES mode is being used which isn't CTR, where changing data in one block doesn't affect other blocks.
See GetEntrySize for the total size readable with this.
IContentMetaDatabase
This is "nn::ncm::IContentMetaDatabase".
Note the official name for Meta Record is "ContentMetaKey".
Cmd | Name | Notes |
---|---|---|
0 | InsertEntryContentRecords | Takes a Meta Record, a type-5 Content Records buffer and a u64 size. |
1 | ReadEntryContentRecords | Takes a Meta Record, a type-6 buffer to write Content Records to and a u64 size. Returns the actual Content Records size read. |
2 | RemoveEntryContentRecords | Takes a Meta Record, and removes the associated record. |
3 | GetEntryContentNcaId | Takes a Meta Record and a u8 Title Type. Returns a #NcaID. |
4 | ReadEntryContentRecordEntries | Takes a type-6 buffer to write Content Record entries to, a Meta Record, and a u32 index into the Content Record entries to start copying from. Returns a u32 entries_read. |
5 | List | Takes a type-6 buffer to write Meta Records to, a u32 Title Type, a u64 TID, a u64 TID_LOW, and u64 TID_HIGH. Writes into the buffer all Meta Records with low <= record->title_id <= high, and record->type == type. Additionally requires record->title_id == TID, if record->type is Application, Patch, Add-On, or Delta. |
6 | GetMetaRecord | Takes a u64 title id, and returns the Meta Record with the highest version field for that title id. |
7 | #ListApplication | |
8 | IsEntryPresent | Takes a Meta Record and returns whether that record is present in the database. |
9 | AreEntriesPresent | Takes a type-5 buffer containing Meta Records (code assumes there are size/sizeof(meta_record) records in the buffer), and returns whether all of those records are present in the database. |
10 | GetEntryContentRecordsSize | Takes a Meta Record, and returns the size of the associated Content Records. |
11 | GetEntryUnknownRecordSize | Takes a Meta Record, and returns u32 from ContentRecords + 16 (only if the Meta record has type Application or Patch). |
12 | GetEntryUpdateTitleId | Takes a Meta Record, and returns the update title id for that record. |
13 | CloseMetaDatabase | Closes the meta database, and causes all future IPC commands to the current session to return error 0xDC05. |
14 | #CheckNcaIDsPresent | Takes a type-6 byte buffer, and a type-5 buffer of #NcaIDs. |
15 | SaveMetaDatabase | Flushes the in-memory database to savedata. |
16 | CheckEntryHasNcaId | Takes a Meta Record and an #NcaID. Returns whether the content records for that meta record contain the NcaID. |
17 | ReadEntryMetaRecords | Takes a type-6 Meta Record output buffer, a u32 eoffset into that buffer, and an input Meta Record. |
18 | Takes a 0x10-sized entry. Returns a bool/u8. | |
19 | Takes a 0x10-sized entry. Returns a u32. |
ListApplication
Each 24-byte entry (officially "ApplicationContentMetaKey") is as follows:
meta_record meta_record; u64 base_title_id;
This function takes in a type 6 buffer to write entries to, and a u8 "filter" type. If filter is zero, all update records will be copied to to the output buffer (space permitting). Otherwise, only titles with type == filter_type will be copied to the output buffer.
This func returns a u32 num_entries_written, and a u32 num_entries_total.
ReadEntryMetaRecords
Takes a type-6 Meta Record output buffer, a u32 eoffset into that buffer, and an input Meta Record entry. Returns a u32 for total_read_entries.
Reads the meta records stored in the entry's content records into the output buffer.
This is used, for example, with System Update title 0100000000000816, which contains Meta Records for all other systitles in its Content Records.
CheckEntryNcaIDsPresent
Takes a type-6 byte buffer, and a type-5 buffer containing #NcaIDs.
This function was stubbed to return 0xDC05 in 2.0.0.
On 1.0.0: Initialized the output buffer to all 1s. Then, for each #NcaID in the input buffer, it checks if that NcaID is present anywhere in the database, and if so writes 0 to the corresponding output byte.
In pseudocode, the function basically does the following:
for i in range(len(out_buf)):
out_buf[i] = 1
for i, NcaID in NcaIDs:
if is_present_in_database(NcaID): out_buf[i] = 0
NcaID
This is a 0x10-byte entry. This is originally from the hex portion of "<hex>.nca" directory-names from this storage FS(like SD).
The NcaID is the same as the first 0x10-bytes from the calculated SHA256 hash, from hashing the entire output from ReadEntryRaw.
Enums
Title Types
Value | Description |
---|---|
0x01 | System Programs (System Modules or System Applets) |
0x02 | System Data Archives |
0x03 | System Update |
0x04 | Firmware package A |
0x05 | Firmware package B |
0x80 | Regular application |
0x81 | Update title |
0x82 | Add-on content |
0x83 | Delta title |