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nxdumptool/source/cnmt.c
Pablo Curiel d385d40862 NACP parsing (part 1). 
God, I'm so tired. I'll go play some good old MGS3 and continue this stuff at a later time. It builds, though.
2020-10-03 13:09:29 -04:00

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/*
* cnmt.c
*
* Copyright (c) 2020, DarkMatterCore <pabloacurielz@gmail.com>.
*
* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
*
* nxdumptool is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* nxdumptool is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "utils.h"
#include "cnmt.h"
#include "title.h"
#define CNMT_MINIMUM_FILENAME_LENGTH 23 /* Content Meta Type + "_" + Title ID + ".cnmt". */
/* Function prototypes. */
static bool cnmtGetContentMetaTypeAndTitleIdFromFileName(const char *cnmt_filename, size_t cnmt_filename_len, u8 *out_content_meta_type, u64 *out_title_id);
static const char *cnmtGetRequiredTitleVersionString(u8 content_meta_type);
static const char *cnmtGetRequiredTitleTypeString(u8 content_meta_type);
bool cnmtInitializeContext(ContentMetaContext *out, NcaContext *nca_ctx)
{
if (!out || !nca_ctx || !strlen(nca_ctx->content_id_str) || nca_ctx->content_type != NcmContentType_Meta || nca_ctx->content_size < NCA_FULL_HEADER_LENGTH || \
(nca_ctx->storage_id != NcmStorageId_GameCard && !nca_ctx->ncm_storage) || (nca_ctx->storage_id == NcmStorageId_GameCard && !nca_ctx->gamecard_offset) || \
nca_ctx->header.content_type != NcaContentType_Meta || !out)
{
LOGFILE("Invalid parameters!");
return false;
}
u32 i = 0, pfs_entry_count = 0;
size_t cnmt_filename_len = 0;
u8 content_meta_type = 0;
u64 title_id = 0, cur_offset = 0;
bool success = false, invalid_ext_header_size = false, invalid_ext_data_size = false;
/* Free output context beforehand. */
cnmtFreeContext(out);
/* Initialize Partition FS context. */
if (!pfsInitializeContext(&(out->pfs_ctx), &(nca_ctx->fs_contexts[0])))
{
LOGFILE("Failed to initialize Partition FS context!");
goto end;
}
/* Get Partition FS entry count. */
if (!(pfs_entry_count = pfsGetEntryCount(&(out->pfs_ctx))))
{
LOGFILE("Partition FS has no file entries!");
goto end;
}
/* Look for the '.cnmt' file entry index. */
for(i = 0; i < pfs_entry_count; i++)
{
if ((out->cnmt_filename = pfsGetEntryNameByIndex(&(out->pfs_ctx), i)) && (cnmt_filename_len = strlen(out->cnmt_filename)) >= CNMT_MINIMUM_FILENAME_LENGTH && \
!strncasecmp(out->cnmt_filename + cnmt_filename_len - 5, ".cnmt", 5)) break;
}
if (i >= pfs_entry_count)
{
LOGFILE("'.cnmt' entry unavailable in Partition FS!");
goto end;
}
//LOGFILE("Found '.cnmt' entry \"%s\" in Meta NCA \"%s\".", out->cnmt_filename, nca_ctx->content_id_str);
/* Retrieve content meta type and title ID from the '.cnmt' filename. */
if (!cnmtGetContentMetaTypeAndTitleIdFromFileName(out->cnmt_filename, cnmt_filename_len, &content_meta_type, &title_id)) goto end;
/* Get '.cnmt' file entry. */
if (!(out->pfs_entry = pfsGetEntryByIndex(&(out->pfs_ctx), i)))
{
LOGFILE("Failed to get '.cnmt' entry from Partition FS!");
goto end;
}
/* Check raw CNMT size. */
if (!out->pfs_entry->size)
{
LOGFILE("Invalid raw CNMT size!");
goto end;
}
/* Allocate memory for the raw CNMT data. */
out->raw_data_size = out->pfs_entry->size;
out->raw_data = malloc(out->raw_data_size);
if (!out->raw_data)
{
LOGFILE("Failed to allocate memory for the raw CNMT data!");
goto end;
}
/* Read raw CNMT data into memory buffer. */
if (!pfsReadEntryData(&(out->pfs_ctx), out->pfs_entry, out->raw_data, out->raw_data_size, 0))
{
LOGFILE("Failed to read raw CNMT data!");
goto end;
}
/* Calculate SHA-256 checksum for the whole raw CNMT. */
sha256CalculateHash(out->raw_data_hash, out->raw_data, out->raw_data_size);
/* Save pointer to NCA context to the output CNMT context. */
out->nca_ctx = nca_ctx;
/* Verify packaged header. */
out->packaged_header = (ContentMetaPackagedContentMetaHeader*)out->raw_data;
cur_offset += sizeof(ContentMetaPackagedContentMetaHeader);
if (out->packaged_header->title_id != title_id)
{
LOGFILE("CNMT title ID mismatch! (%016lX != %016lX).", out->packaged_header->title_id, title_id);
goto end;
}
if (out->packaged_header->content_meta_type != content_meta_type)
{
LOGFILE("CNMT content meta type mismatch! (0x%02X != 0x%02X).", out->packaged_header->content_meta_type, content_meta_type);
goto end;
}
if (!out->packaged_header->content_count)
{
LOGFILE("Invalid content count!");
goto end;
}
if ((out->packaged_header->content_meta_type == NcmContentMetaType_SystemUpdate && !out->packaged_header->content_meta_count) || \
(out->packaged_header->content_meta_type != NcmContentMetaType_SystemUpdate && out->packaged_header->content_meta_count))
{
LOGFILE("Invalid content meta count!");
goto end;
}
/* Save pointer to extended header. */
if (out->packaged_header->extended_header_size)
{
out->extended_header = (out->raw_data + cur_offset);
cur_offset += out->packaged_header->extended_header_size;
switch(out->packaged_header->content_meta_type)
{
case NcmContentMetaType_SystemUpdate:
invalid_ext_header_size = (out->packaged_header->extended_header_size != (u16)sizeof(ContentMetaSystemUpdateMetaExtendedHeader));
out->extended_data_size = (!invalid_ext_header_size ? ((ContentMetaSystemUpdateMetaExtendedHeader*)out->extended_header)->extended_data_size : 0);
invalid_ext_data_size = (out->extended_data_size <= sizeof(ContentMetaSystemUpdateMetaExtendedDataHeader));
break;
case NcmContentMetaType_Application:
invalid_ext_header_size = (out->packaged_header->extended_header_size != (u16)sizeof(ContentMetaApplicationMetaExtendedHeader));
break;
case NcmContentMetaType_Patch:
invalid_ext_header_size = (out->packaged_header->extended_header_size != (u16)sizeof(ContentMetaPatchMetaExtendedHeader));
out->extended_data_size = (!invalid_ext_header_size ? ((ContentMetaPatchMetaExtendedHeader*)out->extended_header)->extended_data_size : 0);
invalid_ext_data_size = (out->extended_data_size <= sizeof(ContentMetaPatchMetaExtendedDataHeader));
break;
case NcmContentMetaType_AddOnContent:
invalid_ext_header_size = (out->packaged_header->extended_header_size != (u16)sizeof(ContentMetaAddOnContentMetaExtendedHeader));
break;
case NcmContentMetaType_Delta:
invalid_ext_header_size = (out->packaged_header->extended_header_size != (u16)sizeof(ContentMetaDeltaMetaExtendedHeader));
out->extended_data_size = (!invalid_ext_header_size ? ((ContentMetaDeltaMetaExtendedHeader*)out->extended_header)->extended_data_size : 0);
invalid_ext_data_size = (out->extended_data_size <= sizeof(ContentMetaDeltaMetaExtendedDataHeader));
break;
default:
invalid_ext_header_size = (out->packaged_header->extended_header_size > 0);
break;
}
if (invalid_ext_header_size)
{
LOGFILE("Invalid extended header size!");
goto end;
}
if (invalid_ext_data_size)
{
LOGFILE("Invalid extended data size!");
goto end;
}
}
/* Save pointer to packaged content infos. */
out->packaged_content_info = (NcmPackagedContentInfo*)(out->raw_data + cur_offset);
cur_offset += (out->packaged_header->content_count * sizeof(NcmPackagedContentInfo));
/* Save pointer to content meta infos. */
if (out->packaged_header->content_meta_count)
{
out->content_meta_info = (NcmContentMetaInfo*)(out->raw_data + cur_offset);
cur_offset += (out->packaged_header->content_meta_count * sizeof(NcmContentMetaInfo));
}
/* Save pointer to the extended data block. */
if (out->extended_data_size)
{
out->extended_data = (out->raw_data + cur_offset);
cur_offset += out->extended_data_size;
}
/* Save pointer to digest. */
out->digest = (out->raw_data + cur_offset);
cur_offset += CNMT_DIGEST_SIZE;
/* Safety check: verify raw CNMT size. */
if (cur_offset != out->raw_data_size)
{
LOGFILE("Raw CNMT size mismatch! (0x%X != 0x%X).", cur_offset, out->raw_data_size);
goto end;
}
success = true;
end:
if (!success) cnmtFreeContext(out);
return success;
}
bool cnmtGenerateAuthoringToolXml(ContentMetaContext *cnmt_ctx, NcaContext *nca_ctx, u32 nca_ctx_count)
{
if (!cnmtIsValidContext(cnmt_ctx) || !nca_ctx || nca_ctx_count != ((u32)cnmt_ctx->packaged_header->content_count + 1))
{
LOGFILE("Invalid parameters!");
return false;
}
u32 i, j;
char *xml_buf = NULL;
u64 xml_buf_size = 0;
char digest_str[0x41] = {0};
bool success = false, invalid_nca = false;
/* Free AuthoringTool-like XML data if needed. */
if (cnmt_ctx->authoring_tool_xml) free(cnmt_ctx->authoring_tool_xml);
cnmt_ctx->authoring_tool_xml = NULL;
cnmt_ctx->authoring_tool_xml_size = 0;
if (!utilsAppendFormattedStringToBuffer(&xml_buf, &xml_buf_size, \
"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" \
"<ContentMeta>\n" \
" <Type>%s</Type>\n" \
" <Id>0x%016lx</Id>\n" \
" <Version>%u</Version>\n" \
" <RequiredDownloadSystemVersion>%u</RequiredDownloadSystemVersion>\n", \
titleGetNcmContentMetaTypeName(cnmt_ctx->packaged_header->content_meta_type), \
cnmt_ctx->packaged_header->title_id, \
cnmtGetVersionInteger(&(cnmt_ctx->packaged_header->version)), \
cnmtGetVersionInteger(&(cnmt_ctx->packaged_header->required_download_system_version)))) goto end;
for(i = 0; i < nca_ctx_count; i++)
{
/* Check if this NCA is really referenced by our CNMT. */
if (nca_ctx[i].content_type != NcmContentType_Meta)
{
/* Non-Meta NCAs: check if their content IDs are part of the packaged content info entries from the CNMT. */
for(j = 0; j < cnmt_ctx->packaged_header->content_count; j++)
{
if (!memcmp(cnmt_ctx->packaged_content_info[j].info.content_id.c, nca_ctx[i].content_id.c, 0x10)) break;
}
invalid_nca = (j >= cnmt_ctx->packaged_header->content_count);
} else {
/* Meta NCAs: quick and dirty pointer comparison because why not. */
invalid_nca = (cnmt_ctx->nca_ctx != &(nca_ctx[i]));
}
if (invalid_nca)
{
LOGFILE("NCA \"%s\" isn't referenced by this CNMT!", nca_ctx[i].content_id_str);
goto end;
}
if (!utilsAppendFormattedStringToBuffer(&xml_buf, &xml_buf_size, \
" <Content>\n" \
" <Type>%s</Type>\n" \
" <Id>%s</Id>\n" \
" <Size>%lu</Size>\n" \
" <Hash>%s</Hash>\n" \
" <KeyGeneration>%u</KeyGeneration>\n" \
" <IdOffset>%u</IdOffset>\n" \
" </Content>\n", \
titleGetNcmContentTypeName(nca_ctx[i].content_type), \
nca_ctx[i].content_id_str, \
nca_ctx[i].content_size, \
nca_ctx[i].hash_str, \
nca_ctx[i].key_generation, \
nca_ctx[i].id_offset)) goto end;
}
utilsGenerateHexStringFromData(digest_str, sizeof(digest_str), cnmt_ctx->digest, CNMT_DIGEST_SIZE);
if (!utilsAppendFormattedStringToBuffer(&xml_buf, &xml_buf_size, \
" <Digest>%s</Digest>\n" \
" <KeyGenerationMin>%u</KeyGenerationMin>\n", \
digest_str, \
cnmt_ctx->nca_ctx->key_generation)) goto end;
if (cnmt_ctx->packaged_header->content_meta_type == NcmContentMetaType_Application || cnmt_ctx->packaged_header->content_meta_type == NcmContentMetaType_Patch || \
cnmt_ctx->packaged_header->content_meta_type == NcmContentMetaType_AddOnContent)
{
u32 required_title_version = cnmtGetVersionInteger((ContentMetaVersion*)(cnmt_ctx->extended_header + sizeof(u64)));
const char *required_title_version_str = cnmtGetRequiredTitleVersionString(cnmt_ctx->packaged_header->content_meta_type);
u64 required_title_id = *((u64*)cnmt_ctx->extended_header);
const char *required_title_type_str = cnmtGetRequiredTitleTypeString(cnmt_ctx->packaged_header->content_meta_type);
if (!utilsAppendFormattedStringToBuffer(&xml_buf, &xml_buf_size, \
" <%s>%u</%s>\n" \
" <%s>0x%016lx</%s>\n", \
required_title_version_str, \
required_title_version, \
required_title_version_str, \
required_title_type_str, \
required_title_id, \
required_title_type_str)) goto end;
}
if (cnmt_ctx->packaged_header->content_meta_type == NcmContentMetaType_Application)
{
if (!utilsAppendFormattedStringToBuffer(&xml_buf, &xml_buf_size, \
" <RequiredApplicationVersion>%u</RequiredApplicationVersion>\n", \
cnmtGetVersionInteger((ContentMetaVersion*)(cnmt_ctx->extended_header + sizeof(u64) + sizeof(u32))))) goto end;
}
if (!(success = utilsAppendFormattedStringToBuffer(&xml_buf, &xml_buf_size, "</ContentMeta>"))) goto end;
/* Update CNMT context. */
cnmt_ctx->authoring_tool_xml = xml_buf;
cnmt_ctx->authoring_tool_xml_size = strlen(xml_buf);
end:
if (!success)
{
if (xml_buf) free(xml_buf);
LOGFILE("Failed to generate CNMT AuthoringTool XML!");
}
return success;
}
static bool cnmtGetContentMetaTypeAndTitleIdFromFileName(const char *cnmt_filename, size_t cnmt_filename_len, u8 *out_content_meta_type, u64 *out_title_id)
{
if (!cnmt_filename || cnmt_filename_len < CNMT_MINIMUM_FILENAME_LENGTH || !out_content_meta_type || !out_title_id)
{
LOGFILE("Invalid parameters!");
return false;
}
u8 i = 0;
const char *pch1 = NULL, *pch2 = NULL;
size_t content_meta_type_str_len = 0;
pch1 = (const char*)strstr(cnmt_filename, "_");
pch2 = (cnmt_filename + cnmt_filename_len - 5);
if (!pch1 || !(content_meta_type_str_len = (pch1 - cnmt_filename)) || (pch2 - ++pch1) != 16)
{
LOGFILE("Invalid '.cnmt' filename in Partition FS!");
return false;
}
for(i = NcmContentMetaType_SystemProgram; i <= NcmContentMetaType_Delta; i++)
{
if (i > NcmContentMetaType_BootImagePackageSafe && i < NcmContentMetaType_Application)
{
i = (NcmContentMetaType_Application - 1);
continue;
}
if (!strncasecmp(cnmt_filename, titleGetNcmContentMetaTypeName(i), content_meta_type_str_len))
{
*out_content_meta_type = i;
break;
}
}
if (i > NcmContentMetaType_Delta)
{
LOGFILE("Invalid content meta type \"%.*s\" in '.cnmt' filename!", (int)content_meta_type_str_len, cnmt_filename);
return false;
}
if (!(*out_title_id = strtoull(pch1, NULL, 16)))
{
LOGFILE("Invalid title ID in '.cnmt' filename!");
return false;
}
return true;
}
static const char *cnmtGetRequiredTitleVersionString(u8 content_meta_type)
{
const char *str = NULL;
switch(content_meta_type)
{
case NcmContentMetaType_Application:
case NcmContentMetaType_Patch:
str = "RequiredSystemVersion";
break;
case NcmContentMetaType_AddOnContent:
str = "RequiredApplicationVersion";
break;
default:
str = "Unknown";
break;
}
return str;
}
static const char *cnmtGetRequiredTitleTypeString(u8 content_meta_type)
{
const char *str = NULL;
switch(content_meta_type)
{
case NcmContentMetaType_Application:
str = "PatchId";
break;
case NcmContentMetaType_Patch:
case NcmContentMetaType_AddOnContent:
str = "ApplicationId";
break;
default:
str = "Unknown";
break;
}
return str;
}
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