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btrfs-progs/tests/fssum.c

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/*
* Copyright (C) 2012 STRATO AG. 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 "kerncompat.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <sys/sysmacros.h>
#include <sys/stat.h>
#include <sys/xattr.h>
#include <assert.h>
#include <time.h>
#include <stdint.h>
#include "crypto/sha.h"
#define CS_SIZE 32
#define CHUNKS 128
#ifndef SEEK_DATA
#define SEEK_DATA 3
#define SEEK_HOLE 4
#endif
/* TODO: add hardlink recognition */
struct excludes {
char *path;
int len;
};
typedef struct _sum {
SHA256Context sha;
unsigned char out[CS_SIZE];
} sum_t;
typedef int (*sum_file_data_t)(int fd, sum_t *dst);
int gen_manifest = 0;
int in_manifest = 0;
char *checksum = NULL;
struct excludes *excludes;
int n_excludes = 0;
int verbose = 0;
FILE *out_fp;
FILE *in_fp;
enum _flags {
FLAG_UID,
FLAG_GID,
FLAG_MODE,
FLAG_ATIME,
FLAG_MTIME,
FLAG_CTIME,
FLAG_DATA,
FLAG_XATTRS,
FLAG_OPEN_ERROR,
FLAG_STRUCTURE,
NUM_FLAGS
};
const char flchar[] = "ugoamcdtes";
char line[65536];
int flags[NUM_FLAGS] = {1, 1, 1, 1, 1, 0, 1, 1, 0, 0};
char *
getln(char *buf, int size, FILE *fp)
{
char *p;
int l;
p = fgets(buf, size, fp);
if (!p)
return NULL;
l = strlen(p);
while(l > 0 && (p[l - 1] == '\n' || p[l - 1] == '\r'))
p[--l] = 0;
return p;
}
void
parse_flag(int c)
{
int i;
int is_upper = 0;
if (c >= 'A' && c <= 'Z') {
is_upper = 1;
c += 'a' - 'A';
}
for (i = 0; flchar[i]; ++i) {
if (flchar[i] == c) {
flags[i] = is_upper ? 0 : 1;
return;
}
}
fprintf(stderr, "unrecognized flag %c\n", c);
exit(-1);
}
void
parse_flags(char *p)
{
while (*p)
parse_flag(*p++);
}
void
usage(void)
{
fprintf(stderr, "usage: fssum <options> <path>\n");
fprintf(stderr, " options:\n");
fprintf(stderr, " -f : write out a full manifest file\n");
fprintf(stderr, " -w <file> : send output to file\n");
fprintf(stderr, " -v : verbose mode (debugging only)\n");
fprintf(stderr, " -r <file> : read checksum or manifest from file\n");
fprintf(stderr, " -[ugoamcdtes]: specify which fields to include in checksum calculation.\n");
fprintf(stderr, " u : include uid\n");
fprintf(stderr, " g : include gid\n");
fprintf(stderr, " o : include mode\n");
fprintf(stderr, " m : include mtime\n");
fprintf(stderr, " a : include atime\n");
fprintf(stderr, " c : include ctime\n");
fprintf(stderr, " d : include file data\n");
fprintf(stderr, " t : include xattrs\n");
fprintf(stderr, " e : include open errors (aborts otherwise)\n");
fprintf(stderr, " s : include block structure (holes)\n");
fprintf(stderr, " -[UGOAMCDTES]: exclude respective field from calculation\n");
fprintf(stderr, " -n : reset all flags\n");
fprintf(stderr, " -N : set all flags\n");
fprintf(stderr, " -x path : exclude path when building checksum (multiple ok)\n");
fprintf(stderr, " -h : this help\n\n");
fprintf(stderr, "The default field mask is ugoamCdtES. If the checksum/manifest is read from a\n");
fprintf(stderr, "file, the mask is taken from there and the values given on the command line\n");
fprintf(stderr, "are ignored.\n");
exit(-1);
}
static char buf[65536];
void *
alloc(size_t sz)
{
void *p = malloc(sz);
if (!p) {
fprintf(stderr, "malloc failed\n");
exit(-1);
}
return p;
}
void
sum_init(sum_t *cs)
{
SHA256Reset(&cs->sha);
}
void
sum_fini(sum_t *cs)
{
SHA256Result(&cs->sha, cs->out);
}
void
sum_add(sum_t *cs, void *buf, int size)
{
SHA256Input(&cs->sha, buf, size);
}
void
sum_add_sum(sum_t *dst, sum_t *src)
{
sum_add(dst, src->out, sizeof(src->out));
}
void
sum_add_u64(sum_t *dst, uint64_t val)
{
uint64_t v = cpu_to_le64(val);
sum_add(dst, &v, sizeof(v));
}
void
sum_add_time(sum_t *dst, time_t t)
{
sum_add_u64(dst, t);
}
char *
sum_to_string(sum_t *dst)
{
int i;
char *s = alloc(CS_SIZE * 2 + 1);
for (i = 0; i < CS_SIZE; ++i)
sprintf(s + i * 2, "%02x", dst->out[i]);
return s;
}
int
namecmp(const void *aa, const void *bb)
{
char * const *a = aa;
char * const *b = bb;
return strcmp(*a, *b);
}
int
sum_xattrs(int fd, sum_t *dst)
{
ssize_t buflen;
ssize_t len;
char *buf;
char *p;
char **names = NULL;
int num_xattrs = 0;
int ret = 0;
int i;
buflen = flistxattr(fd, NULL, 0);
if (buflen < 0)
return -errno;
/* no xattrs exist */
if (buflen == 0)
return 0;
buf = malloc(buflen);
if (!buf)
return -ENOMEM;
buflen = flistxattr(fd, buf, buflen);
if (buflen < 0) {
ret = -errno;
goto out;
}
/*
* Keep the list of xattrs sorted, because the order in which they are
* listed is filesystem dependent, so we want to get the same checksum
* on different filesystems.
*/
p = buf;
len = buflen;
while (len > 0) {
int keylen;
keylen = strlen(p) + 1; /* +1 for NULL terminator */
len -= keylen;
p += keylen;
num_xattrs++;
}
names = malloc(sizeof(char *) * num_xattrs);
if (!names) {
ret = -ENOMEM;
goto out;
}
p = buf;
for (i = 0; i < num_xattrs; i++) {
names[i] = p;
p += strlen(p) + 1; /* +1 for NULL terminator */
}
qsort(names, num_xattrs, sizeof(char *), namecmp);
for (i = 0; i < num_xattrs; i++) {
len = fgetxattr(fd, names[i], NULL, 0);
if (len < 0) {
ret = -errno;
goto out;
}
sum_add(dst, names[i], strlen(names[i]));
/* no value */
if (len == 0)
continue;
p = malloc(len);
if (!p) {
ret = -ENOMEM;
goto out;
}
len = fgetxattr(fd, names[i], p, len);
if (len < 0) {
ret = -errno;
free(p);
goto out;
}
sum_add(dst, p, len);
free(p);
}
out:
free(buf);
free(names);
return ret;
}
int
sum_file_data_permissive(int fd, sum_t *dst)
{
int ret;
while (1) {
ret = read(fd, buf, sizeof(buf));
if (ret < 0)
return -errno;
sum_add(dst, buf, ret);
if (ret < sizeof(buf))
break;
}
return 0;
}
int
sum_file_data_strict(int fd, sum_t *dst)
{
int ret;
off_t pos;
pos = lseek(fd, 0, SEEK_CUR);
if (pos == (off_t)-1)
return errno == ENXIO ? 0 : -2;
while (1) {
pos = lseek(fd, pos, SEEK_DATA);
if (pos == (off_t)-1)
return errno == ENXIO ? 0 : -2;
ret = read(fd, buf, sizeof(buf));
assert(ret); /* eof found by lseek */
if (ret <= 0)
return ret;
if (verbose >= 2)
fprintf(stderr,
"adding to sum at file offset %llu, %d bytes\n",
(unsigned long long)pos, ret);
sum_add_u64(dst, (uint64_t)pos);
sum_add(dst, buf, ret);
pos += ret;
}
}
char *
escape(char *in)
{
char *out = alloc(strlen(in) * 3 + 1);
char *src = in;
char *dst = out;
for (; *src; ++src) {
if (*src >= 32 && *src < 127 && *src != '\\') {
*dst++ = *src;
} else {
sprintf(dst, "\\%02x", (unsigned char)*src);
dst += 3;
}
}
*dst = 0;
return out;
}
void
excess_file(const char *fn)
{
printf("only in local fs: %s\n", fn);
}
void
missing_file(const char *fn)
{
printf("only in remote fs: %s\n", fn);
}
int
pathcmp(const char *a, const char *b)
{
int len_a = strlen(a);
int len_b = strlen(b);
/*
* as the containing directory is sent after the files, it has to
* come out bigger in the comparison.
*/
if (len_a < len_b && a[len_a - 1] == '/' && strncmp(a, b, len_a) == 0)
return 1;
if (len_a > len_b && b[len_b - 1] == '/' && strncmp(a, b, len_b) == 0)
return -1;
return strcmp(a, b);
}
void
check_match(char *fn, char *local_m, char *remote_m,
char *local_c, char *remote_c)
{
int match_m = !strcmp(local_m, remote_m);
int match_c = !strcmp(local_c, remote_c);
if (match_m && !match_c) {
printf("data mismatch in %s\n", fn);
} else if (!match_m && match_c) {
printf("metadata mismatch in %s\n", fn);
} else if (!match_m && !match_c) {
printf("metadata and data mismatch in %s\n", fn);
}
}
char *prev_fn;
char *prev_m;
char *prev_c;
void
check_manifest(char *fn, char *m, char *c, int last_call)
{
char *rem_m;
char *rem_c;
char *l;
int cmp;
if (prev_fn) {
if (last_call)
cmp = -1;
else
cmp = pathcmp(prev_fn, fn);
if (cmp > 0) {
excess_file(fn);
return;
} else if (cmp < 0) {
missing_file(prev_fn);
} else {
check_match(fn, m, prev_m, c, prev_c);
}
free(prev_fn);
free(prev_m);
free(prev_c);
prev_fn = NULL;
prev_m = NULL;
prev_c = NULL;
if (cmp == 0)
return;
}
while ((l = getln(line, sizeof(line), in_fp))) {
rem_c = strrchr(l, ' ');
if (!rem_c) {
if (checksum)
free(checksum);
/* final cs */
checksum = strdup(l);
break;
}
if (rem_c == l) {
malformed:
fprintf(stderr, "malformed input\n");
exit(-1);
}
*rem_c++ = 0;
rem_m = strrchr(l, ' ');
if (!rem_m)
goto malformed;
*rem_m++ = 0;
if (last_call)
cmp = -1;
else
cmp = pathcmp(l, fn);
if (cmp == 0) {
check_match(fn, m, rem_m, c, rem_c);
return;
} else if (cmp > 0) {
excess_file(fn);
prev_fn = strdup(l);
prev_m = strdup(rem_m);
prev_c = strdup(rem_c);
return;
}
missing_file(l);
}
if (!last_call)
excess_file(fn);
}
void
sum(int dirfd, int level, sum_t *dircs, char *path_prefix, char *path_in)
{
DIR *d;
struct dirent *de;
char **namelist = NULL;
int alloclen = 0;
int entries = 0;
int i;
int ret;
int fd;
int excl;
sum_file_data_t sum_file_data = flags[FLAG_STRUCTURE] ?
sum_file_data_strict : sum_file_data_permissive;
struct stat64 dir_st;
if (fstat64(dirfd, &dir_st)) {
perror("fstat");
exit(-1);
}
d = fdopendir(dirfd);
if (!d) {
perror("opendir");
exit(-1);
}
while((de = readdir(d))) {
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
continue;
if (entries == alloclen) {
alloclen += CHUNKS;
namelist = realloc(namelist,
alloclen * sizeof(*namelist));
if (!namelist) {
fprintf(stderr, "malloc failed\n");
exit(-1);
}
}
namelist[entries] = strdup(de->d_name);
if (!namelist[entries]) {
fprintf(stderr, "malloc failed\n");
exit(-1);
}
++entries;
}
qsort(namelist, entries, sizeof(*namelist), namecmp);
for (i = 0; i < entries; ++i) {
struct stat64 st;
sum_t cs;
sum_t meta;
char *path;
sum_init(&cs);
sum_init(&meta);
path = alloc(strlen(path_in) + strlen(namelist[i]) + 3);
sprintf(path, "%s/%s", path_in, namelist[i]);
for (excl = 0; excl < n_excludes; ++excl) {
if (strncmp(excludes[excl].path, path,
excludes[excl].len) == 0)
goto next;
}
ret = fchdir(dirfd);
if (ret == -1) {
perror("fchdir");
exit(-1);
}
ret = lstat64(namelist[i], &st);
if (ret) {
fprintf(stderr, "stat failed for %s/%s: %m\n",
path_prefix, path);
exit(-1);
}
/* We are crossing into a different subvol, skip this subtree. */
if (st.st_dev != dir_st.st_dev)
goto next;
sum_add_u64(&meta, level);
sum_add(&meta, namelist[i], strlen(namelist[i]));
if (!S_ISDIR(st.st_mode))
sum_add_u64(&meta, st.st_nlink);
if (flags[FLAG_UID])
sum_add_u64(&meta, st.st_uid);
if (flags[FLAG_GID])
sum_add_u64(&meta, st.st_gid);
if (flags[FLAG_MODE])
sum_add_u64(&meta, st.st_mode);
if (flags[FLAG_ATIME])
sum_add_time(&meta, st.st_atime);
if (flags[FLAG_MTIME])
sum_add_time(&meta, st.st_mtime);
if (flags[FLAG_CTIME])
sum_add_time(&meta, st.st_ctime);
if (flags[FLAG_XATTRS] &&
(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
fd = openat(dirfd, namelist[i], 0);
if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
sum_add_u64(&meta, errno);
} else if (fd == -1) {
fprintf(stderr, "open failed for %s/%s: %m\n",
path_prefix, path);
exit(-1);
} else {
ret = sum_xattrs(fd, &meta);
close(fd);
if (ret < 0) {
errno = -ret;
fprintf(stderr,
"failed to read xattrs from "
"%s/%s: %m\n",
path_prefix, path);
exit(-1);
}
}
}
if (S_ISDIR(st.st_mode)) {
fd = openat(dirfd, namelist[i], 0);
if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
sum_add_u64(&meta, errno);
} else if (fd == -1) {
fprintf(stderr, "open failed for %s/%s: %m\n",
path_prefix, path);
exit(-1);
} else {
sum(fd, level + 1, &cs, path_prefix, path);
close(fd);
}
} else if (S_ISREG(st.st_mode)) {
sum_add_u64(&meta, st.st_size);
if (flags[FLAG_DATA]) {
if (verbose)
fprintf(stderr, "file %s\n",
namelist[i]);
fd = openat(dirfd, namelist[i], 0);
if (fd == -1 && flags[FLAG_OPEN_ERROR]) {
sum_add_u64(&meta, errno);
} else if (fd == -1) {
fprintf(stderr,
"open failed for %s/%s: %m\n",
path_prefix, path);
exit(-1);
}
if (fd != -1) {
ret = sum_file_data(fd, &cs);
if (ret < 0) {
fprintf(stderr,
"read failed for "
"%s/%s: %m\n",
path_prefix, path);
exit(-1);
}
close(fd);
}
}
} else if (S_ISLNK(st.st_mode)) {
ret = readlink(namelist[i], buf, sizeof(buf));
if (ret == -1) {
perror("readlink");
exit(-1);
}
sum_add(&cs, buf, ret);
} else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
sum_add_u64(&cs, major(st.st_rdev));
sum_add_u64(&cs, minor(st.st_rdev));
}
sum_fini(&cs);
sum_fini(&meta);
if (gen_manifest || in_manifest) {
char *fn;
char *m;
char *c;
if (S_ISDIR(st.st_mode))
strcat(path, "/");
fn = escape(path);
m = sum_to_string(&meta);
c = sum_to_string(&cs);
if (gen_manifest)
fprintf(out_fp, "%s %s %s\n", fn, m, c);
if (in_manifest)
check_manifest(fn, m, c, 0);
free(c);
free(m);
free(fn);
}
sum_add_sum(dircs, &cs);
sum_add_sum(dircs, &meta);
next:
free(path);
}
}
int
main(int argc, char *argv[])
{
extern char *optarg;
extern int optind;
int c;
char *path;
int fd;
sum_t cs;
char *sumstring;
char flagstring[sizeof(flchar)];
int ret = 0;
int i;
int plen;
int elen;
int n_flags = 0;
const char *allopts = "heEfuUgGoOaAmMcCdDtTsSnNw:r:vx:";
out_fp = stdout;
while ((c = getopt(argc, argv, allopts)) != EOF) {
switch(c) {
case 'f':
gen_manifest = 1;
break;
case 'u':
case 'U':
case 'g':
case 'G':
case 'o':
case 'O':
case 'a':
case 'A':
case 'm':
case 'M':
case 'c':
case 'C':
case 'd':
case 'D':
case 'T':
case 't':
case 'e':
case 'E':
case 's':
case 'S':
++n_flags;
parse_flag(c);
break;
case 'n':
for (i = 0; i < NUM_FLAGS; ++i)
flags[i] = 0;
break;
case 'N':
for (i = 0; i < NUM_FLAGS; ++i)
flags[i] = 1;
break;
case 'w':
out_fp = fopen(optarg, "w");
if (!out_fp) {
fprintf(stderr,
"failed to open output file: %m\n");
exit(-1);
}
break;
case 'r':
in_fp = fopen(optarg, "r");
if (!in_fp) {
fprintf(stderr,
"failed to open input file: %m\n");
exit(-1);
}
break;
case 'x':
++n_excludes;
excludes = realloc(excludes,
sizeof(*excludes) * n_excludes);
if (!excludes) {
fprintf(stderr,
"failed to alloc exclude space\n");
exit(-1);
}
excludes[n_excludes - 1].path = optarg;
break;
case 'v':
++verbose;
break;
case 'h':
case '?':
usage();
}
}
if (optind + 1 != argc) {
fprintf(stderr, "missing path\n");
usage();
}
if (in_fp) {
char *l = getln(line, sizeof(line), in_fp);
char *p;
if (l == NULL) {
fprintf(stderr, "failed to read line from input\n");
exit(-1);
}
if (strncmp(l, "Flags: ", 7) == 0) {
l += 7;
in_manifest = 1;
parse_flags(l);
} else if ((p = strchr(l, ':'))) {
*p++ = 0;
parse_flags(l);
if (checksum)
free(checksum);
checksum = strdup(p);
} else {
fprintf(stderr, "invalid input file format\n");
exit(-1);
}
if (n_flags)
fprintf(stderr, "warning: "
"command line flags ignored in -r mode\n");
}
strcpy(flagstring, flchar);
for (i = 0; i < NUM_FLAGS; ++i) {
if (flags[i] == 0)
flagstring[i] -= 'a' - 'A';
}
path = argv[optind];
plen = strlen(path);
if (path[plen - 1] == '/') {
--plen;
path[plen] = '\0';
}
for (i = 0; i < n_excludes; ++i) {
if (strncmp(path, excludes[i].path, plen) != 0)
fprintf(stderr,
"warning: exclude %s outside of path %s\n",
excludes[i].path, path);
else
excludes[i].path += plen;
elen = strlen(excludes[i].path);
if (excludes[i].path[elen - 1] == '/')
--elen;
excludes[i].path[elen] = '\0';
excludes[i].len = elen;
}
fd = open(path, O_RDONLY);
if (fd == -1) {
fprintf(stderr, "failed to open %s: %m\n", path);
exit(-1);
}
if (gen_manifest)
fprintf(out_fp, "Flags: %s\n", flagstring);
sum_init(&cs);
sum(fd, 1, &cs, path, "");
sum_fini(&cs);
close(fd);
if (in_manifest)
check_manifest("", "", "", 1);
if (!checksum) {
if (in_manifest) {
fprintf(stderr, "malformed input\n");
exit(-1);
}
if (!gen_manifest)
fprintf(out_fp, "%s:", flagstring);
sumstring = sum_to_string(&cs);
fprintf(out_fp, "%s\n", sumstring);
free(sumstring);
} else {
sumstring = sum_to_string(&cs);
if (strcmp(checksum, sumstring) == 0) {
printf("OK\n");
ret = 0;
} else {
printf("FAIL\n");
ret = 1;
}
free(checksum);
free(sumstring);
}
if (in_fp)
fclose(in_fp);
if (out_fp != stdout)
fclose(out_fp);
exit(ret);
}
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