package.c

/*
* Copyright (c) 2018 Reisyukaku
*
* This program 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.
*
* This program 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 "hwinit.h"
#include "error.h"
#include "fs.h"
#include "package.h"
#include "kippatches/fs.inc"

u8 *ReadPackage1(sdmmc_storage_t *storage) {
    u8 *pk11 = malloc(0x40000);
    sdmmc_storage_read(storage, 0x100000 / NX_EMMC_BLOCKSIZE, 0x40000 / NX_EMMC_BLOCKSIZE, pk11);
    return pk11;
}

u8 *ReadPackage2(sdmmc_storage_t *storage) {
    // Read GPT partition.
    LIST_INIT(gpt);
    sdmmc_storage_set_mmc_partition(storage, 0);
    print("Parsing GPT...\n");
    nx_emmc_gpt_parse(&gpt, storage);
    emmc_part_t *pkg2_part = nx_emmc_part_find(&gpt, "BCPKG2-1-Normal-Main");
    nx_emmc_gpt_free(&gpt);
    if (!pkg2_part) {
        error("Failed to read GPT!\n");
        return 0;
    }

    // Read Package2.
    u8 *tmp = (u8 *)malloc(NX_EMMC_BLOCKSIZE);
    print("Reading Package2 size...\n");
    nx_emmc_part_read(storage, pkg2_part, 0x4000 / NX_EMMC_BLOCKSIZE, 1, tmp);
    u32 *hdr = (u32 *)(tmp + 0x100);
    u32 pkg2_size = hdr[0] ^ hdr[2] ^ hdr[3];
    free(tmp);
    u8 *pkg2 = malloc(ALIGN(pkg2_size, NX_EMMC_BLOCKSIZE));
    print("Reading Package2...\n");
    u32 ret = nx_emmc_part_read(storage, pkg2_part, 0x4000 / NX_EMMC_BLOCKSIZE, ALIGN(pkg2_size, NX_EMMC_BLOCKSIZE) / NX_EMMC_BLOCKSIZE, pkg2);
    sdmmc_storage_end(storage);
    if (!ret) {
        error("Failed to read Package2!\n");
        return 0;
    }
    return pkg2;
}

pkg2_hdr_t *unpackFirmwarePackage(u8 *data) {
    print("Unpacking firmware...\n");
    pkg2_hdr_t *hdr = (pkg2_hdr_t *)(data + 0x100);
    
    //Decrypt header.
    se_aes_crypt_ctr(8, hdr, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);

    if (hdr->magic != PKG2_MAGIC) {
        error("Package2 Magic invalid!\n");
        return NULL;
    }

    //Decrypt body
    data += (0x100 + sizeof(pkg2_hdr_t));
    
    for (u32 i = 0; i < 4; i++) {
        if (!hdr->sec_size[i])
            continue;

        se_aes_crypt_ctr(8, data, hdr->sec_size[i], data, hdr->sec_size[i], &hdr->sec_ctr[i * 0x10]);

        data += hdr->sec_size[i];
    }

    return hdr;
}

void pkg1_unpack(pk11_offs *offs, u8 *pkg1) {
    u8 ret = 0;
    u8 *extWb;
    u8 *extSec;
    
    pk11_header *hdr = (pk11_header *)(pkg1 + offs->pkg11_off + 0x20);

    u32 sec_size[3] = { hdr->wb_size, hdr->ldr_size, hdr->sm_size };
    u8 *pdata = (u8 *)hdr + sizeof(pk11_header);
    
    for (u32 i = 0; i < 3; i++) {
        if (offs->sec_map[i] == 0 && offs->warmboot_base) {
            u8 *extWb = NULL;
            if(fopen("/ReiNX/warmboot.bin", "rb") != 0) {
                extWb = malloc(fsize());
                fread(extWb, fsize(), 1);
                fclose();
            }
            memcpy((void *)offs->warmboot_base, extWb == NULL ? pdata : extWb, sec_size[offs->sec_map[i]]);
        } else if (offs->sec_map[i] == 2 && offs->secmon_base) {
            u8 *extSec = NULL;
            if(fopen("/ReiNX/secmon.bin", "rb") != 0) {
                extSec = malloc(fsize());
                fread(extSec, fsize(), 1);
                fclose();
            }
            memcpy((u8 *)offs->secmon_base, extSec == NULL ? pdata : extSec, sec_size[offs->sec_map[i]]);
        }
        pdata += sec_size[offs->sec_map[i]];
    }
    if(extWb != NULL) {
        free(extWb); 
        customWarmboot = 1;
    }
    if(extSec != NULL) {
        free(extSec); 
        customSecmon = 1;
    }
}

const pkg2_kernel_id_t *pkg2_identify(u32 id)
{
	for (u32 i = 0; _pkg2_kernel_ids[i].crc32c_id; i++)
		if (id == _pkg2_kernel_ids[i].crc32c_id)
			return &_pkg2_kernel_ids[i];
	return NULL;
}

void buildFirmwarePackage(u8 *kernel, u32 kernel_size, link_t *kips_info) {
    u8 *pdst = (u8 *)0xA9800000;

    // Signature.
    memset(pdst, 0, 0x100);
    pdst += 0x100;

    // Header.
    pkg2_hdr_t *hdr = (pkg2_hdr_t *)pdst;
    memset(hdr, 0, sizeof(pkg2_hdr_t));
    pdst += sizeof(pkg2_hdr_t);
    hdr->magic = PKG2_MAGIC;
    hdr->base = 0x10000000;
    print("kernel @ %08X (%08X)\n", (u32)kernel, kernel_size);

    // Kernel.
    u8 *extKern = NULL;
    if(fopen("/ReiNX/kernel.bin", "rb") != 0) {
        extKern = malloc(fsize());
        fread(extKern, fsize(), 1);
        fclose();
    }
    if(extKern != NULL) customKern = 1;
    memcpy(pdst, extKern == NULL ? kernel : extKern, kernel_size);
    hdr->sec_size[PKG2_SEC_KERNEL] = kernel_size;
    hdr->sec_off[PKG2_SEC_KERNEL] = 0x10000000;
    se_aes_crypt_ctr(8, pdst, kernel_size, pdst, kernel_size, &hdr->sec_ctr[PKG2_SEC_KERNEL * 0x10]);
    pdst += kernel_size;
    print("kernel encrypted\n");

    // INI1.
    u32 ini1_size = sizeof(pkg2_ini1_t);
    pkg2_ini1_t *ini1 = (pkg2_ini1_t *)pdst;
    memset(ini1, 0, sizeof(pkg2_ini1_t));
    ini1->magic = INI1_MAGIC;
    pdst += sizeof(pkg2_ini1_t);
    LIST_FOREACH_ENTRY(pkg2_kip1_info_t, ki, kips_info, link) {
        print("adding kip1 '%s' @ %08X (%08X)\n", ki->kip1->name, (u32)ki->kip1, ki->size);
        memcpy(pdst, ki->kip1, ki->size);
        pdst += ki->size;
        ini1_size += ki->size;
        ini1->num_procs++;
    }
    ini1->size = ini1_size;
    hdr->sec_size[PKG2_SEC_INI1] = ini1_size;
    hdr->sec_off[PKG2_SEC_INI1] = 0x14080000;
    se_aes_crypt_ctr(8, ini1, ini1_size, ini1, ini1_size, &hdr->sec_ctr[PKG2_SEC_INI1 * 0x10]);
    print("INI1 encrypted\n");

    // Encrypt header.
    *(u32 *)hdr->ctr = 0x100 + sizeof(pkg2_hdr_t) + kernel_size + ini1_size;
    se_aes_crypt_ctr(8, hdr, sizeof(pkg2_hdr_t), hdr, sizeof(pkg2_hdr_t), hdr);
    memset(hdr->ctr, 0 , 0x10);
    *(u32 *)hdr->ctr = 0x100 + sizeof(pkg2_hdr_t) + kernel_size + ini1_size;
}

size_t calcKipSize(pkg2_kip1_t *kip1) {
    u32 size = sizeof(pkg2_kip1_t);
    for (u32 j = 0; j < KIP1_NUM_SECTIONS; j++)
        size += kip1->sections[j].size_comp;
    return size;
}

void pkg2_parse_kips(link_t *info, pkg2_hdr_t *pkg2) {
    u8 *ptr = pkg2->data + pkg2->sec_size[PKG2_SEC_KERNEL];
    pkg2_ini1_t *ini1 = (pkg2_ini1_t *)ptr;
    ptr += sizeof(pkg2_ini1_t);

    for (u32 i = 0; i < ini1->num_procs; i++) {
        pkg2_kip1_t *kip1 = (pkg2_kip1_t *)ptr;
        pkg2_kip1_info_t *ki = (pkg2_kip1_info_t *)malloc(sizeof(pkg2_kip1_info_t));
        ki->kip1 = kip1;
        ki->size = calcKipSize(kip1);
        list_append(info, &ki->link);
        ptr += ki->size;
    }
}

void loadKip(link_t *info, char *path) {
    if(fopen(path, "rb") == 0) return;
    pkg2_kip1_t *ckip = malloc(fsize());
    fread(ckip, fsize(), 1);
    fclose();
    LIST_FOREACH_ENTRY(pkg2_kip1_info_t, ki, info, link) {
        if (ki->kip1->tid == ckip->tid) {
            ki->kip1 = ckip;
            ki->size = calcKipSize(ckip);
            return;
        }
    }
    pkg2_kip1_info_t *ki = malloc(sizeof(pkg2_kip1_info_t));
    ki->kip1 = ckip;
    ki->size = calcKipSize(ckip);
    list_append(info, &ki->link);
}

// TODO: get full hashes somewhere and not just the first 16 bytes
// every second one is the exfat version
kippatchset_t kip_patches[] = {
    { "FS", "\xde\x9f\xdd\xa4\x08\x5d\xd5\xfe\x68\xdc\xb2\x0b\x41\x09\x5b\xb4", fs_kip_patches_100 },
    { "FS", "\xfc\x3e\x80\x99\x1d\xca\x17\x96\x4a\x12\x1f\x04\xb6\x1b\x17\x5e", fs_kip_patches_100 },
    { "FS", "\xcd\x7b\xbe\x18\xd6\x13\x0b\x28\xf6\x2f\x19\xfa\x79\x45\x53\x5b", fs_kip_patches_200 },
    { "FS", "\xe7\x66\x92\xdf\xaa\x04\x20\xe9\xfd\xd6\x8e\x43\x63\x16\x18\x18", fs_kip_patches_200 },
    { "FS", "\x0d\x70\x05\x62\x7b\x07\x76\x7c\x0b\x96\x3f\x9a\xff\xdd\xe5\x66", fs_kip_patches_210 },
    { "FS", "\xdb\xd8\x5f\xca\xcc\x19\x3d\xa8\x30\x51\xc6\x64\xe6\x45\x2d\x32", fs_kip_patches_210 },
    { "FS", "\xa8\x6d\xa5\xe8\x7e\xf1\x09\x7b\x23\xda\xb5\xb4\xdb\xba\xef\xe7", fs_kip_patches_300 },
    { "FS", "\x98\x1c\x57\xe7\xf0\x2f\x70\xf7\xbc\xde\x75\x31\x81\xd9\x01\xa6", fs_kip_patches_300 },
    { "FS", "\x57\x39\x7c\x06\x3f\x10\xb6\x31\x3f\x4d\x83\x76\x53\xcc\xc3\x71", fs_kip_patches_301 },
    { "FS", "\x07\x30\x99\xd7\xc6\xad\x7d\x89\x83\xbc\x7a\xdd\x93\x2b\xe3\xd1", fs_kip_patches_301 },
    { "FS", "\x06\xe9\x07\x19\x59\x5a\x01\x0c\x62\x46\xff\x70\x94\x6f\x10\xfb", fs_kip_patches_401 },
    { "FS", "\x54\x9b\x0f\x8d\x6f\x72\xc4\xe9\xf3\xfd\x1f\x19\xea\xce\x4a\x5a", fs_kip_patches_401 },
    { "FS", "\x80\x96\xaf\x7c\x6a\x35\xaa\x82\x71\xf3\x91\x69\x95\x41\x3b\x0b", fs_kip_patches_410 },
    { "FS", "\x02\xd5\xab\xaa\xfd\x20\xc8\xb0\x63\x3a\xa0\xdb\xae\xe0\x37\x7e", fs_kip_patches_410 },
    { "FS", "\xa6\xf2\x7a\xd9\xac\x7c\x73\xad\x41\x9b\x63\xb2\x3e\x78\x5a\x0c", fs_kip_patches_500 },
    { "FS", "\xce\x3e\xcb\xa2\xf2\xf0\x62\xf5\x75\xf8\xf3\x60\x84\x2b\x32\xb4", fs_kip_patches_500 },
    { "FS", "\x76\xf8\x74\x02\xc9\x38\x7c\x0f\x0a\x2f\xab\x1b\x45\xce\xbb\x93", fs_kip_patches_510 },
    { "FS", "\x10\xb2\xd8\x16\x05\x48\x85\x99\xdf\x22\x42\xcb\x6b\xac\x2d\xf1", fs_kip_patches_510 },
    { "FS", "\x1b\x82\xcb\x22\x18\x67\xcb\x52\xc4\x4a\x86\x9e\xa9\x1a\x1a\xdd", fs_kip_patches_600 },
    { "FS", "\x96\x6a\xdd\x3d\x20\xb6\x27\x13\x2c\x5a\x8d\xa4\x9a\xc9\xd8\xdd", fs_kip_patches_600_exfat },
    { NULL, NULL, NULL },
};

int kippatch_apply(u8 *kipdata, u64 kipdata_len, kippatch_t *patch) {
    if (!patch || !patch->diffs) return -1;

    for (kipdiff_t *diff = patch->diffs; diff->len; ++diff) {
        if (!diff->len || diff->offset + diff->len > kipdata_len)
            return 1 + (int)(diff - patch->diffs);
        u8 *start = kipdata + diff->offset;
        if (memcmp(start, diff->orig_bytes, diff->len))
            continue;
        // TODO: maybe start copying after every diff has been verified?
        memcpy(start, diff->patch_bytes, diff->len);
    }

    return 0;
}


int nca_patch(u8 * kipdata, u64 kipdata_len) {
	char pattern[8] = {0xE5, 0x07, 0x00, 0x32, 0xE0, 0x03, 0x16, 0xAA};
	char buf[0x10];
	memcpy(buf, kipdata+0x1C450, 0x10);
	u32 * addr = memsearch(kipdata, kipdata_len, pattern, sizeof(pattern));
	int ret=0;
	int max_dist = 0x10;
	for(int i=0; i<max_dist; i++) {
		u32 op = addr[i];
		if((op & 0xFC000000)==0x94000000) { //is a BL op
			addr[i] = NOP;
			ret=1;
			break;
		}
	}
	return ret;
}

int kippatch_apply_set(u8 *kipdata, u64 kipdata_len, kippatchset_t *patchset) {
    char *patchFilter[] = { "nosigchk", "nocmac", "nogc", NULL };
    
    if (!fopen("/ReiNX/nogc", "rb")) {
        patchFilter[2] = NULL;
        fclose();
    }
    
    for (kippatch_t *p = patchset->patches; p && p->name; ++p) {
        int found = 0;
        for (char **filtname = patchFilter; filtname && *filtname; ++filtname) {
            if (!strcmp(p->name, *filtname)) {
                found = 1;
                break;
            }
        }

        if (patchFilter && !found) continue;

        int r = kippatch_apply(kipdata, kipdata_len, p);
        if (r) return r;
    }
	if(!strncmp("FS", patchset->kip_name, 2))
		nca_patch(kipdata, kipdata_len);
    return 0;
}

kippatchset_t *kippatch_find_set(u8 *kiphash, kippatchset_t *patchsets) {
    for (kippatchset_t *ps = patchsets; ps && ps->kip_name; ++ps) {
        if (!memcmp(kiphash, ps->kip_hash, 0x10)) return ps;
    }
    return NULL;
}