diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | README.md | 3 | ||||
| -rw-r--r-- | convert/convert.ha | 33 | ||||
| -rw-r--r-- | gpt/crc32.ha | 81 | ||||
| -rw-r--r-- | gpt/gpt.ha | 197 | ||||
| -rw-r--r-- | main.ha | 18 | ||||
| -rw-r--r-- | mbr/mbr.ha | 50 | ||||
| -rw-r--r-- | sector/sector.ha | 48 |
8 files changed, 431 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..178ff6e --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/gptman
\ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..6d142c0 --- /dev/null +++ b/README.md @@ -0,0 +1,3 @@ +# gptman + +gptman is an utility to manage GPT volumes.
\ No newline at end of file diff --git a/convert/convert.ha b/convert/convert.ha new file mode 100644 index 0000000..10f73c7 --- /dev/null +++ b/convert/convert.ha @@ -0,0 +1,33 @@ +use fmt; + +use mbr; +use gpt; +use sector; + +use os; +use io; +use fs; +use strings; +use errors; + + +export fn convert(args: []str) void = { + if (len(args) < 2) { + fmt::fatalf("gptman.convert: needs disk"); + }; + + fmt::println(args[1])!; + let file = os::open(args[1], fs::flags::RDWR)!; + defer io::close(file)!; + + let vol = gpt::from(file)!; + gpt::mkbackup(vol); + defer { + gpt::chksums(vol); + gpt::commit(vol); + gpt::finish(vol); + }; + + vol.primary.header.disk_guid[0] = 0xcafebabe; + vol.primary.header.disk_guid[1] = 0xabababababababab; +}; diff --git a/gpt/crc32.ha b/gpt/crc32.ha new file mode 100644 index 0000000..24318bd --- /dev/null +++ b/gpt/crc32.ha @@ -0,0 +1,81 @@ +// crc32 polynomial used by the gpt specification +const crc_table: [256]u32 = [ + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, + 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, + 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, + 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, + 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, + 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, + 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, + 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, + 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, + 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, + 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, + 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, + 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, + 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, + 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, + 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, + 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, + 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, + 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, + 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, + 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, + 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, + 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, + 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, + 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, + 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, + 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, + 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, + 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, + 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, + 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, + 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, + 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, + 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, + 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, + 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, + 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, + 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, + 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, + 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, + 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, + 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, + 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, + 0x2d02ef8d +]; + +// Calculates the crc32 header checksum +export fn header_crc32(self: *header) u32 = { + const data = self: *[*]u8; + + let crc: u32 = 0xffffffff; + for (let i = 0z; i < 0x5c; i += 1) { + let d: u8 = data[i]; + + // set current byte to 0 or skip them if it's the checksum + // or the reserved bytes + if (i >= 0x10 && i < 0x14) { + d = 0; + }; + if (i >= 0x14 && i < 0x18) { + d = 0; + }; + + + let lookup_index: u32 = (crc ^ d) & 0xff; + crc = (crc >> 8) ^ crc_table[lookup_index]; + }; + + crc ^= 0xffffffff; + return crc; +}; diff --git a/gpt/gpt.ha b/gpt/gpt.ha new file mode 100644 index 0000000..e1ebcfd --- /dev/null +++ b/gpt/gpt.ha @@ -0,0 +1,197 @@ +use errors; +use io; +use types; +use rt; +use fmt; + +use mbr; +use sector; + +export type nogpt = !void; + +export type gpt = struct { + mbr_sec: sector::sector, + mbr: *mbr::mbr, + primary: block, + backup: block +}; + +export type block = struct { + header_sec: sector::sector, + entries_sec: sector::sector, + header: *header, + entries: *[128]entry +}; + +fn block_getheader(self: *block) *header = { + return self.header_sec.buf: *[*]u8: *header; +}; + +fn block_getentries(self: *block) []entry = { + const e = types::slice { + data = self.entries_sec.buf: *[*]u8, + length = 128, + capacity = 128 + }; + + return *(&e: *const []entry); +}; + +fn block_commit(self: *block) void = { + sector::commit(&self.header_sec); + //sector::commit(&self.entries_sec); +}; + +fn block_fetch(self: *block) void = { + sector::fetch(&self.header_sec); + sector::fetch(&self.entries_sec); +}; + +fn block_drop(self: *block) void = { + sector::finish(&self.header_sec); + sector::finish(&self.entries_sec); +}; + +export type header = struct { + @offset(0) signature: u64, + @offset(8) revision: u32, + @offset(12) header_size: u32, + @offset(16) header_crc32: u32, + @offset(20) reserved0: u32, + @offset(24) header_lba: u64, + @offset(32) backup_header_lba: u64, + @offset(40) first_lba: u64, + @offset(48) last_lba: u64, + @offset(56) disk_guid: [2]u64, + @offset(72) entries_lba: u64, + @offset(80) entries_len: u32, + @offset(84) entry_size: u32, + @offset(88) entries_crc32: u32 +}; + +export type entry = struct { + @offset(0) part_type: [2]u64, + @offset(16) part: [2]u64, + @offset(32) lba_begin: u64, + @offset(40) lba_end: u64, + @offset(48) attributes: u64, + @offset(56) name: [72]u8 +}; + +export fn validate(self: *gpt) bool = { + if (getheader(self).signature != 0x5452415020494645) { + return false; + }; + + return true; +}; + +export fn from(fd: io::file) (*gpt | nogpt | errors::error) = { + const prim_header_sector = sector::map(fd, 1, 1); + sector::fetch(&prim_header_sector); + const prim_header = prim_header_sector.buf: *[*]u8: *header; + // XXX validate header + + const prim_table_sector = sector::map(fd, prim_header.entries_lba, prim_header.entries_lba + 128*128/512 - 1); + sector::fetch(&prim_table_sector); + + // Create the primary GPT copy + const primary = block { + header_sec = prim_header_sector, + entries_sec = prim_table_sector, + header = prim_header, + entries = prim_table_sector.buf: *[*]u8: *[128]entry + }; + + + const back_header_sector = sector::map(fd, prim_header.backup_header_lba, prim_header.backup_header_lba); + sector::fetch(&back_header_sector); + const back_header = back_header_sector.buf: *[*]u8: *header; + //XXX validate header + + const back_table_sector = sector::map(fd, back_header.entries_lba, back_header.entries_lba + 128*128/512 - 1); + + sector::fetch(&back_table_sector); + + // Create the backup block structure + let backup = block { + header_sec = back_header_sector, + entries_sec = back_table_sector, + header = back_header, + entries = back_table_sector.buf: *[*]u8: *[128]entry + }; + + + const mbr_sec = sector::map(fd, 0, 0); + + // Allocate the GPT structure + let self = alloc(gpt { + mbr_sec = mbr_sec, + mbr = mbr_sec.buf: *[*]u8: *mbr::mbr, + primary = primary, + backup = backup + }); + + // Fetch the MBR + sector::fetch(&self.mbr_sec); + + return self; +}; + +// Frees the resources associated with the GPT structure. +export fn finish(self: *gpt) void = { + sector::finish(&self.mbr_sec); + block_drop(&self.primary); + block_drop(&self.backup); + free(self); +}; + +// Updates the data structures from the disk +export fn fetch(self: *gpt) void = { + sector::fetch(&self.mbr_sec); + block_fetch(&self.primary); + block_fetch(&self.backup); +}; + +export fn mkbackup(self: *gpt) void = { + rt::memcpy(self.backup.header, self.primary.header, size(header)); + rt::memcpy(self.backup.entries, self.primary.entries, size([128]entry)); + + self.backup.header.header_lba = self.backup.header_sec.lba_begin; + self.backup.header.backup_header_lba = self.primary.header_sec.lba_begin; + self.backup.header.entries_lba = self.backup.entries_sec.lba_begin; +}; + +// Commits changed done on the data structure to the disk +export fn commit(self: *gpt) void = { + // XXX: CRC32 checksum + + sector::commit(&self.mbr_sec); + block_commit(&self.primary); + block_commit(&self.backup); + //const header = getheader(self); + + // XXX: update copy + //sector::commit_at(self.mbr, self.mbr.fd, header.backup_header_lba); +}; + +// Updates the CRC32 checksums of the different blocks +export fn chksums(self: *gpt) void = { + self.primary.header.header_crc32 = header_crc32(self.primary.header); + self.backup.header.header_crc32 = header_crc32(self.backup.header); +}; + +// Gets the MBR structure. Return value is borrowed from argument. +export fn getmbr(self: *gpt) *mbr::mbr = { + return self.mbr_sec.buf: *[*]u8: *mbr::mbr; +}; + +// Gets the GPT primary header structure. Return value is borrowed from argument. +export fn getheader(self: *gpt) *header = { + return block_getheader(&self.primary); +}; + +// Gets the GPT primary entries structures. Return value is borrowed from argument. +export fn getentries(self: *gpt) []entry = { + return block_getentries(&self.primary); +}; @@ -0,0 +1,18 @@ +use fmt; +use getopt; +use os; + +use convert; +use mbr; +use gpt; + +export fn main() void = { + if (len(os::args) < 2) { + fmt::fatalf("{}: expected command", os::args[0]); + }; + + switch (os::args[1]) { + case "convert" => convert::convert(os::args[1..]); + case => fmt::fatalf("{}: no such command {}", os::args[0], os::args[1]); + }; +}; diff --git a/mbr/mbr.ha b/mbr/mbr.ha new file mode 100644 index 0000000..ceb115f --- /dev/null +++ b/mbr/mbr.ha @@ -0,0 +1,50 @@ +use io; + +use sector; +use errors; + +def mbr_lba: size = 0; + +export type nombr = !void; + +export type mbr = struct { + @offset(0) bootstrap: [440]u8, + @offset(440) udid: u32, + @offset(444) reserved: u16, + @offset(446) entries: [4]mbr_entry, + @offset(510) magic: u16, +}; + +export type mbr_entry = struct { + @offset(0) attributes: u8, + @offset(4) part_type: u8, + @offset(8) lba_begin: u32, + @offset(12) lba_end: u32, +}; + +export fn validate(self: *mbr) bool = { + if (self.magic != 0xaa55) { + return false; + }; + + return true; +}; + +// Gets a handle to the MBR of a partition. +// Return value is returned to user. Resource should be freed with mbr::finish. +export fn from(fd: io::file) (*mbr | nombr | errors::error) = { + const self = io::mmap(null, sector::length, io::prot::READ | io::prot::WRITE, io::mflags::SHARED, fd, sector::lba(mbr_lba))!: *mbr; + + if (!validate(self)) { + io::munmap(self, sector::length)?; + return nombr; + }; + + return self; +}; + +// Frees the resources associated with the MBR partition. +// User revokes ownership. +export fn finish(self: *mbr) (void | errors::error) = { + io::munmap(self, sector::length)?; +}; diff --git a/sector/sector.ha b/sector/sector.ha new file mode 100644 index 0000000..50f417b --- /dev/null +++ b/sector/sector.ha @@ -0,0 +1,48 @@ +use io; +use types; + +use fmt; + +export const length: u64 = 512; + +export fn lba(no: u64) size = { + return no * length; +}; + +export type sector = struct { + buf: []u8, + fd: io::file, + lba_begin: u64, + lba_end: u64, +}; + +export fn map(fd: io::file, lba_begin: u64, lba_end: u64) sector = { + let self = sector { + buf = alloc([0...], (lba_end - lba_begin + 1)*length), + fd = fd, + lba_begin = lba_begin, + lba_end = lba_end + }; + + return self; +}; + +export fn finish(self: *sector) void = { + free(self.buf); +}; + +export fn fetch(self: *sector) void = { + // XXX proper error + io::seek(self.fd, (self.lba_begin * length): io::off, io::whence::SET)!; + io::read(self.fd, self.buf)!; +}; + +export fn commit(self: *sector) void = { + io::seek(self.fd, (self.lba_begin * length): io::off, io::whence::SET)!; + io::write(self.fd, self.buf)!; +}; + +export fn commit_at(self: *sector, fd: io::file, lba: u64) void = { + io::seek(fd, (lba * length): io::off, io::whence::SET)!; + io::write(fd, self.buf)!; +}; |