From: Arne Jansen <sensille@gmx.net>
To: Andrey Kuzmin <andrey.v.kuzmin@gmail.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] Fits: tool to parse stream
Date: Fri, 12 Oct 2012 17:22:29 +0200 [thread overview]
Message-ID: <507835B5.5000304@gmx.net> (raw)
In-Reply-To: <CANvN+e=YQ2HG2sDrhy-WqfsnSXbT=LFA18Wj-FZK6NC-gMyeAA@mail.gmail.com>
On 12.10.2012 17:19, Andrey Kuzmin wrote:
> Besides already occupied name discussed in a separate thread, I'd suggest to
> check if libcrc32 may be linked directly instead of copying. Formats for various
> types may be also declared static instead of conditionals in the code.
>
The code is completely self contained. The idea was that it just builds on every
platform.
-Arne
> Regards,
> Andrey
>
> 12.10.2012 17:33 пользователь "Arne Jansen" <sensille@gmx.net
> <mailto:sensille@gmx.net>> написал:
>
> Simple tool to parse a fits-stream from stdout.
>
> Signed-off-by: Arne Jansen <sensille@gmx.net <mailto:sensille@gmx.net>>
> ---
>
> The idea of the btrfs send stream format was to generate it in a way that
> it is easy to receive on different platforms. Thus the proposed name FITS, for
> Filesystem Incremental Backup Stream. We should also build the tools to
> receive the stream on different platforms.
> As a place to collect those I created at git at
>
> git://git.kernel.org/pub/scm/linux/kernel/git/arne/fits-progs.git
> <http://git.kernel.org/pub/scm/linux/kernel/git/arne/fits-progs.git>
> ---
>
> Makefile | 4 +
> fitsparse.c | 402 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 406 insertions(+), 0 deletions(-)
> create mode 100644 Makefile
> create mode 100644 fitsparse.c
>
> diff --git a/Makefile b/Makefile
> new file mode 100644
> index 0000000..1c56476
> --- /dev/null
> +++ b/Makefile
> @@ -0,0 +1,4 @@
> +all: fitsparse
> +
> +fitsparse: fitsparse.c
> + gcc -Wall fitsparse.c -o fitsparse
> diff --git a/fitsparse.c b/fitsparse.c
> new file mode 100644
> index 0000000..3a52250
> --- /dev/null
> +++ b/fitsparse.c
> @@ -0,0 +1,402 @@
> +/*
> + * Copyright (C) 2012 STRATO. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public
> + * License v2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that 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, write to the
> + * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
> + * Boston, MA 021110-1307, USA.
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <string.h>
> +#include <errno.h>
> +#include <time.h>
> +
> +int print_binary = 0;
> +
> +/*
> + * stream definitions taken from send.h, (C) Alexander Block
> + */
> +#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
> +#define BTRFS_SEND_STREAM_VERSION 1
> +#define BTRFS_SEND_BUF_SIZE (1024 * 64)
> +
> +struct btrfs_stream_header {
> + char magic[sizeof(BTRFS_SEND_STREAM_MAGIC)];
> + uint32_t version;
> +} __attribute__ ((__packed__));
> +
> +struct btrfs_cmd_header {
> + /* len excluding the header */
> + uint32_t len;
> + uint16_t cmd;
> + /* crc including the header with zero crc field */
> + uint32_t crc;
> +} __attribute__ ((__packed__));
> +
> +struct btrfs_tlv_header {
> + uint16_t tlv_type;
> + /* len excluding the header */
> + uint16_t tlv_len;
> +} __attribute__ ((__packed__));
> +
> +char *cmd_names[] = {
> + "UNSPEC",
> + "SUBVOL",
> + "SNAPSHOT",
> + "MKFILE",
> + "MKDIR",
> + "MKNOD",
> + "MKFIFO",
> + "MKSOCK",
> + "SYMLINK",
> + "RENAME",
> + "LINK",
> + "UNLINK",
> + "RMDIR",
> + "SET_XATTR",
> + "REMOVE_XATTR",
> + "WRITE",
> + "CLONE",
> + "TRUNCATE",
> + "CHMOD",
> + "CHOWN",
> + "UTIMES",
> + "END"
> +};
> +#define MAX_CMDS (sizeof(cmd_names) / sizeof(char *))
> +
> +#define TYPE_UNDEF 0
> +#define TYPE_INT 1
> +#define TYPE_STRING 2
> +#define TYPE_BINARY 3
> +#define TYPE_TIME 4
> +#define TYPE_HEX 5
> +#define TYPE_OCTAL 6
> +#define TYPE_LEN_ONLY 7
> +
> +struct attr_types {
> + const char *name;
> + int type;
> +} attrs[] = {
> + { "UNSPEC", TYPE_UNDEF },
> + { "UUID", TYPE_BINARY },
> + { "CTRANSID", TYPE_INT },
> + { "INO", TYPE_INT },
> + { "SIZE", TYPE_INT },
> + { "MODE", TYPE_OCTAL },
> + { "UID", TYPE_INT },
> + { "GID", TYPE_INT },
> + { "RDEV", TYPE_HEX },
> + { "CTIME", TYPE_TIME },
> + { "MTIME", TYPE_TIME },
> + { "ATIME", TYPE_TIME },
> + { "OTIME", TYPE_TIME },
> + { "XATTR_NAME", TYPE_STRING },
> + { "XATTR_DATA", TYPE_BINARY },
> + { "PATH", TYPE_STRING },
> + { "PATH_TO", TYPE_STRING },
> + { "PATH_LINK", TYPE_STRING },
> + { "FILE_OFFSET", TYPE_INT },
> + { "DATA", TYPE_LEN_ONLY },
> + { "CLONE_UUID", TYPE_BINARY },
> + { "CLONE_CTRANSID", TYPE_INT },
> + { "CLONE_PATH", TYPE_STRING },
> + { "CLONE_OFFSET", TYPE_INT },
> + { "CLONE_LEN", TYPE_INT }
> +};
> +#define MAX_ATTRS (sizeof(attrs) / sizeof(struct attr_types))
> +
> +uint16_t
> +read16(const void *d)
> +{
> + const uint8_t *data = d;
> +
> + return data[0] + (1 << 8) * (uint16_t)data[1];
> +}
> +
> +uint32_t
> +read32(const void *d)
> +{
> + const uint8_t *data = d;
> +
> + return read16(data) + (1 << 16) * (uint32_t)read16(data + 2);
> +}
> +
> +uint64_t
> +read64(const void *d)
> +{
> + const uint8_t *data = d;
> +
> + return read32(data) + (1ull << 32) * (uint64_t)read32(data + 2);
> +}
> +
> +/*
> + * Extracted from the linux kernel source code, lib/libcrc32c.c.
> + *
> + */
> +static const uint32_t crc32c_table[256] = {
> + 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
> + 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
> + 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
> + 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
> + 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
> + 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
> + 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
> + 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
> + 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
> + 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
> + 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
> + 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
> + 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
> + 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
> + 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
> + 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
> + 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
> + 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
> + 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
> + 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
> + 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
> + 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
> + 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
> + 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
> + 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
> + 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
> + 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
> + 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
> + 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
> + 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
> + 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
> + 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
> + 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
> + 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
> + 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
> + 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
> + 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
> + 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
> + 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
> + 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
> + 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
> + 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
> + 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
> + 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
> + 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
> + 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
> + 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
> + 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
> + 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
> + 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
> + 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
> + 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
> + 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
> + 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
> + 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
> + 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
> + 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
> + 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
> + 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
> + 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
> + 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
> + 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
> + 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
> + 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
> +};
> +
> +uint32_t crc32c(uint32_t crc, unsigned char const *data, int size)
> +{
> + while (size--)
> + crc = crc32c_table[(crc ^ *data++) & 0xffl] ^ (crc >> 8);
> + return crc;
> +}
> +
> +int
> +print_attr(int type, char *buf, int len)
> +{
> + switch (type) {
> + case TYPE_UNDEF:
> + break;
> + case TYPE_INT:
> + case TYPE_HEX:
> + case TYPE_OCTAL:;
> + uint64_t v;
> + char *format;
> +
> + if (len != 8) {
> + printf("invalid length for integer type attribute\n");
> + return -1;
> + }
> + if (type == TYPE_INT)
> + format = "%lld";
> + else if (type == TYPE_HEX)
> + format = "%llx";
> + else if (type == TYPE_OCTAL)
> + format = "%llo";
> + v = read64(buf);
> + printf(format, v);
> + break;
> + case TYPE_STRING:
> + printf("%.*s", len, buf);
> + break;
> + case TYPE_BINARY:;
> + int i;
> + if (print_binary)
> + for (i = 0; i < len; ++i)
> + printf("%02x", (unsigned char)buf[i]);
> + else
> + printf("<blob len %d>", len);
> + break;
> + case TYPE_TIME:;
> + uint64_t sec;
> + uint32_t nsec;
> + struct tm *t;
> + time_t tim;
> +
> + if (len != 12) {
> + printf("invalid length for timespec attribute\n");
> + return -1;
> + }
> + sec = read64(buf);
> + nsec = read32(buf + 8);
> + tim = sec; /* XXX lossy */
> + t = localtime(&tim);
> + printf("%04d-%02d-%02d %02d:%02d:%02d.%09d",
> + t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
> + t->tm_hour, t->tm_min, t->tm_sec, nsec);
> + break;
> + case TYPE_LEN_ONLY:
> + printf("length %d", len);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +int
> +do_read(void *buf, int len)
> +{
> + int ret;
> +
> + if (len == 0)
> + return 0;
> +
> + ret = fread(buf, 1, len, stdin);
> + if (ret == 0)
> + return 1;
> +
> + if (ret != len) {
> + printf("read error on stdin: %d=%s\n", errno, strerror(errno));
> + return -1;
> + }
> + return 0;
> +}
> +
> +int
> +main(int argc, char **argv)
> +{
> + int ret;
> + unsigned char buf[BTRFS_SEND_BUF_SIZE];
> + struct btrfs_stream_header h;
> + struct btrfs_cmd_header cmd;
> + unsigned char *p;
> +
> + if (argc == 2 && strcmp(argv[1], "-v") == 0)
> + print_binary = 1;
> +
> + ret = do_read(&h, sizeof(h));
> + if (ret) {
> + printf("failed to read header\n");
> + goto out;
> + }
> + if (strncmp(h.magic, BTRFS_SEND_STREAM_MAGIC, sizeof(h.magic))) {
> + printf("bad magic\n");
> + goto out;
> + }
> + if (read32(&h.version) != BTRFS_SEND_STREAM_VERSION) {
> + printf("invalid version %d\n", read32(&h.version));
> + goto out;
> + }
> + printf("stream header, version %d\n", read32(&h.version));
> +
> + while (1) {
> + uint32_t clen;
> + uint32_t crc_is;
> + uint32_t crc_should;
> + uint32_t c;
> +
> + ret = do_read(&cmd, sizeof(cmd));
> + if (ret == 1)
> + break;
> + if (ret) {
> + printf("failed to read command header\n");
> + goto out;
> + }
> + clen = read32(&cmd.len);
> + if (clen > sizeof(buf)) {
> + printf("cmd too long for buf, clen=%d\n", clen);
> + goto out;
> + }
> + ret = do_read(buf, clen);
> + if (ret) {
> + printf("failed to read command contents\n");
> + goto out;
> + }
> + crc_is = read32(&cmd.crc);
> + cmd.crc = 0;
> + crc_should = crc32c(0, (unsigned char *)&cmd, sizeof(cmd));
> + crc_should = crc32c(crc_should, buf, clen);
> + if (crc_is != crc_should) {
> + printf("crcs don't match, 0x%x != 0x%x\n",
> + crc_is, crc_should);
> + goto out;
> + }
> + c = read16(&cmd.cmd);
> + if (c < 1 || c >= MAX_CMDS) {
> + printf("cmd %d out of range\n", c);
> + goto out;
> + }
> + printf("%s: ", cmd_names[c]);
> + p = buf;
> + int first = 1;
> + while (clen) {
> + struct btrfs_tlv_header *tlv;
> + uint16_t type;
> + uint16_t len;
> +
> + tlv = (struct btrfs_tlv_header *)p;
> + type = read16(&tlv->tlv_type);
> + len = read16(&tlv->tlv_len);
> +
> + if (type < 1 || type >= MAX_ATTRS) {
> + printf("attr %d out of range\n", type);
> + goto out;
> + }
> + if (!first)
> + printf(", ");
> + first = 0;
> +
> + printf("%s ", attrs[type].name);
> + ret = print_attr(attrs[type].type,
> + (void *)(tlv + 1), len);
> + if (ret)
> + goto out;
> +
> + p += sizeof(*tlv) + len;
> + clen -= sizeof(*tlv) + len;
> + }
> + printf("\n");
> + }
> +
> +out:
> + exit(0);
> +}
> --
> 1.7.7
>
> --
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>
next prev parent reply other threads:[~2012-10-12 15:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-12 13:32 [PATCH] Fits: tool to parse stream Arne Jansen
[not found] ` <CANvN+e=YQ2HG2sDrhy-WqfsnSXbT=LFA18Wj-FZK6NC-gMyeAA@mail.gmail.com>
2012-10-12 15:22 ` Arne Jansen [this message]
2012-10-13 7:02 ` Arne Jansen
2012-10-13 8:08 ` Rory Campbell-Lange
2012-10-13 15:41 ` David Sterba
2012-10-15 14:32 ` Chris Mason
2012-10-15 20:11 ` Alex Lyakas
2012-10-22 6:41 ` Arne Jansen
2012-10-22 16:21 ` Chris Mason
2012-10-13 11:23 ` Hugo Mills
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