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/*
* Routines used by the file-transfer code.
*
* Copyright (C) 1996 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2003-2014 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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, visit the http://fsf.org website.
*/
#include "rsync.h"
#include "itypes.h"
#include <zlib.h>
extern int do_compression;
extern int protocol_version;
extern int module_id;
extern int def_compress_level;
extern char *skip_compress;
static int compression_level, per_file_default_level;
struct suffix_tree {
struct suffix_tree *sibling;
struct suffix_tree *child;
char letter, word_end;
};
static char *match_list;
static struct suffix_tree *suftree;
static void add_suffix(struct suffix_tree **prior, char ltr, const char *str)
{
struct suffix_tree *node, *newnode;
if (ltr == '[') {
const char *after = strchr(str, ']');
/* Treat "[foo" and "[]" as having a literal '['. */
if (after && after++ != str+1) {
while ((ltr = *str++) != ']')
add_suffix(prior, ltr, after);
return;
}
}
for (node = *prior; node; prior = &node->sibling, node = node->sibling) {
if (node->letter == ltr) {
if (*str)
add_suffix(&node->child, *str, str+1);
else
node->word_end = 1;
return;
}
if (node->letter > ltr)
break;
}
if (!(newnode = new(struct suffix_tree)))
out_of_memory("add_suffix");
newnode->sibling = node;
newnode->child = NULL;
newnode->letter = ltr;
*prior = newnode;
if (*str) {
add_suffix(&newnode->child, *str, str+1);
newnode->word_end = 0;
} else
newnode->word_end = 1;
}
static void add_nocompress_suffixes(const char *str)
{
char *buf, *t;
const char *f = str;
if (!(buf = new_array(char, strlen(f) + 1)))
out_of_memory("add_nocompress_suffixes");
while (*f) {
if (*f == '/') {
f++;
continue;
}
t = buf;
do {
if (isUpper(f))
*t++ = toLower(f);
else
*t++ = *f;
} while (*++f != '/' && *f);
*t++ = '\0';
add_suffix(&suftree, *buf, buf+1);
}
free(buf);
}
static void init_set_compression(void)
{
const char *f;
char *t, *start;
if (skip_compress)
add_nocompress_suffixes(skip_compress);
/* A non-daemon transfer skips the default suffix list if the
* user specified --skip-compress. */
if (skip_compress && module_id < 0)
f = "";
else
f = lp_dont_compress(module_id);
if (!(match_list = t = new_array(char, strlen(f) + 2)))
out_of_memory("set_compression");
per_file_default_level = def_compress_level;
while (*f) {
if (*f == ' ') {
f++;
continue;
}
start = t;
do {
if (isUpper(f))
*t++ = toLower(f);
else
*t++ = *f;
} while (*++f != ' ' && *f);
*t++ = '\0';
if (t - start == 1+1 && *start == '*') {
/* Optimize a match-string of "*". */
*match_list = '\0';
suftree = NULL;
per_file_default_level = 0;
break;
}
/* Move *.foo items into the stuffix tree. */
if (*start == '*' && start[1] == '.' && start[2]
&& !strpbrk(start+2, ".?*")) {
add_suffix(&suftree, start[2], start+3);
t = start;
}
}
*t++ = '\0';
}
/* determine the compression level based on a wildcard filename list */
void set_compression(const char *fname)
{
const struct suffix_tree *node;
const char *s;
char ltr;
if (!do_compression)
return;
if (!match_list)
init_set_compression();
compression_level = per_file_default_level;
if (!*match_list && !suftree)
return;
if ((s = strrchr(fname, '/')) != NULL)
fname = s + 1;
for (s = match_list; *s; s += strlen(s) + 1) {
if (iwildmatch(s, fname)) {
compression_level = 0;
return;
}
}
if (!(node = suftree) || !(s = strrchr(fname, '.'))
|| s == fname || !(ltr = *++s))
return;
while (1) {
if (isUpper(&ltr))
ltr = toLower(&ltr);
while (node->letter != ltr) {
if (node->letter > ltr)
return;
if (!(node = node->sibling))
return;
}
if ((ltr = *++s) == '\0') {
if (node->word_end)
compression_level = 0;
return;
}
if (!(node = node->child))
return;
}
}
/* non-compressing recv token */
static int32 simple_recv_token(int f, char **data)
{
static int32 residue;
static char *buf;
int32 n;
if (!buf) {
buf = new_array(char, CHUNK_SIZE);
if (!buf)
out_of_memory("simple_recv_token");
}
if (residue == 0) {
int32 i = read_int(f);
if (i <= 0)
return i;
residue = i;
}
*data = buf;
n = MIN(CHUNK_SIZE,residue);
residue -= n;
read_buf(f,buf,n);
return n;
}
/* non-compressing send token */
static void simple_send_token(int f, int32 token, struct map_struct *buf,
OFF_T offset, int32 n)
{
if (n > 0) {
int32 len = 0;
while (len < n) {
int32 n1 = MIN(CHUNK_SIZE, n-len);
write_int(f, n1);
write_buf(f, map_ptr(buf, offset+len, n1), n1);
len += n1;
}
}
/* a -2 token means to send data only and no token */
if (token != -2)
write_int(f, -(token+1));
}
/* Flag bytes in compressed stream are encoded as follows: */
#define END_FLAG 0 /* that's all folks */
#define TOKEN_LONG 0x20 /* followed by 32-bit token number */
#define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
#define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
#define TOKEN_REL 0x80 /* + 6-bit relative token number */
#define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
#define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
/* zlib.h says that if we want to be able to compress something in a single
* call, avail_out must be at least 0.1% larger than avail_in plus 12 bytes.
* We'll add in 0.1%+16, just to be safe (and we'll avoid floating point,
* to ensure that this is a compile-time value). */
#define AVAIL_OUT_SIZE(avail_in_size) ((avail_in_size)*1001/1000+16)
/* For coding runs of tokens */
static int32 last_token = -1;
static int32 run_start;
static int32 last_run_end;
/* Deflation state */
static z_stream tx_strm;
/* Output buffer */
static char *obuf;
/* We want obuf to be able to hold both MAX_DATA_COUNT+2 bytes as well as
* AVAIL_OUT_SIZE(CHUNK_SIZE) bytes, so make sure that it's large enough. */
#if MAX_DATA_COUNT+2 > AVAIL_OUT_SIZE(CHUNK_SIZE)
#define OBUF_SIZE (MAX_DATA_COUNT+2)
#else
#define OBUF_SIZE AVAIL_OUT_SIZE(CHUNK_SIZE)
#endif
/* Send a deflated token */
static void
send_deflated_token(int f, int32 token, struct map_struct *buf, OFF_T offset,
int32 nb, int32 toklen)
{
int32 n, r;
static int init_done, flush_pending;
if (last_token == -1) {
/* initialization */
if (!init_done) {
tx_strm.next_in = NULL;
tx_strm.zalloc = NULL;
tx_strm.zfree = NULL;
if (deflateInit2(&tx_strm, compression_level,
Z_DEFLATED, -15, 8,
Z_DEFAULT_STRATEGY) != Z_OK) {
rprintf(FERROR, "compression init failed\n");
exit_cleanup(RERR_PROTOCOL);
}
if ((obuf = new_array(char, OBUF_SIZE)) == NULL)
out_of_memory("send_deflated_token");
init_done = 1;
} else
deflateReset(&tx_strm);
last_run_end = 0;
run_start = token;
flush_pending = 0;
} else if (last_token == -2) {
run_start = token;
} else if (nb != 0 || token != last_token + 1
|| token >= run_start + 65536) {
/* output previous run */
r = run_start - last_run_end;
n = last_token - run_start;
if (r >= 0 && r <= 63) {
write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
} else {
write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
write_int(f, run_start);
}
if (n != 0) {
write_byte(f, n);
write_byte(f, n >> 8);
}
last_run_end = last_token;
run_start = token;
}
last_token = token;
if (nb != 0 || flush_pending) {
/* deflate the data starting at offset */
int flush = Z_NO_FLUSH;
tx_strm.avail_in = 0;
tx_strm.avail_out = 0;
do {
if (tx_strm.avail_in == 0 && nb != 0) {
/* give it some more input */
n = MIN(nb, CHUNK_SIZE);
tx_strm.next_in = (Bytef *)
map_ptr(buf, offset, n);
tx_strm.avail_in = n;
nb -= n;
offset += n;
}
if (tx_strm.avail_out == 0) {
tx_strm.next_out = (Bytef *)(obuf + 2);
tx_strm.avail_out = MAX_DATA_COUNT;
if (flush != Z_NO_FLUSH) {
/*
* We left the last 4 bytes in the
* buffer, in case they are the
* last 4. Move them to the front.
*/
memcpy(tx_strm.next_out,
obuf+MAX_DATA_COUNT-2, 4);
tx_strm.next_out += 4;
tx_strm.avail_out -= 4;
}
}
if (nb == 0 && token != -2)
flush = Z_SYNC_FLUSH;
r = deflate(&tx_strm, flush);
if (r != Z_OK) {
rprintf(FERROR, "deflate returned %d\n", r);
exit_cleanup(RERR_STREAMIO);
}
if (nb == 0 || tx_strm.avail_out == 0) {
n = MAX_DATA_COUNT - tx_strm.avail_out;
if (flush != Z_NO_FLUSH) {
/*
* We have to trim off the last 4
* bytes of output when flushing
* (they are just 0, 0, ff, ff).
*/
n -= 4;
}
if (n > 0) {
obuf[0] = DEFLATED_DATA + (n >> 8);
obuf[1] = n;
write_buf(f, obuf, n+2);
}
}
} while (nb != 0 || tx_strm.avail_out == 0);
flush_pending = token == -2;
}
if (token == -1) {
/* end of file - clean up */
write_byte(f, END_FLAG);
} else if (token != -2 && do_compression == 1) {
/* Add the data in the current block to the compressor's
* history and hash table. */
#ifndef EXTERNAL_ZLIB
do {
/* Break up long sections in the same way that
* see_deflate_token() does. */
int32 n1 = toklen > 0xffff ? 0xffff : toklen;
toklen -= n1;
tx_strm.next_in = (Bytef *)map_ptr(buf, offset, n1);
tx_strm.avail_in = n1;
if (protocol_version >= 31) /* Newer protocols avoid a data-duplicating bug */
offset += n1;
tx_strm.next_out = (Bytef *) obuf;
tx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
r = deflate(&tx_strm, Z_INSERT_ONLY);
if (r != Z_OK || tx_strm.avail_in != 0) {
rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
r, tx_strm.avail_in);
exit_cleanup(RERR_STREAMIO);
}
} while (toklen > 0);
#else
toklen++;
rprintf(FERROR, "Impossible error in external-zlib code (1).\n");
exit_cleanup(RERR_STREAMIO);
#endif
}
}
/* tells us what the receiver is in the middle of doing */
static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
/* for inflating stuff */
static z_stream rx_strm;
static char *cbuf;
static char *dbuf;
/* for decoding runs of tokens */
static int32 rx_token;
static int32 rx_run;
/* Receive a deflated token and inflate it */
static int32 recv_deflated_token(int f, char **data)
{
static int init_done;
static int32 saved_flag;
int32 n, flag;
int r;
for (;;) {
switch (recv_state) {
case r_init:
if (!init_done) {
rx_strm.next_out = NULL;
rx_strm.zalloc = NULL;
rx_strm.zfree = NULL;
if (inflateInit2(&rx_strm, -15) != Z_OK) {
rprintf(FERROR, "inflate init failed\n");
exit_cleanup(RERR_PROTOCOL);
}
if (!(cbuf = new_array(char, MAX_DATA_COUNT))
|| !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE))))
out_of_memory("recv_deflated_token");
init_done = 1;
} else {
inflateReset(&rx_strm);
}
recv_state = r_idle;
rx_token = 0;
break;
case r_idle:
case r_inflated:
if (saved_flag) {
flag = saved_flag & 0xff;
saved_flag = 0;
} else
flag = read_byte(f);
if ((flag & 0xC0) == DEFLATED_DATA) {
n = ((flag & 0x3f) << 8) + read_byte(f);
read_buf(f, cbuf, n);
rx_strm.next_in = (Bytef *)cbuf;
rx_strm.avail_in = n;
recv_state = r_inflating;
break;
}
if (recv_state == r_inflated) {
/* check previous inflated stuff ended correctly */
rx_strm.avail_in = 0;
rx_strm.next_out = (Bytef *)dbuf;
rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
r = inflate(&rx_strm, Z_SYNC_FLUSH);
n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
/*
* Z_BUF_ERROR just means no progress was
* made, i.e. the decompressor didn't have
* any pending output for us.
*/
if (r != Z_OK && r != Z_BUF_ERROR) {
rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
r, n);
exit_cleanup(RERR_STREAMIO);
}
if (n != 0 && r != Z_BUF_ERROR) {
/* have to return some more data and
save the flag for later. */
saved_flag = flag + 0x10000;
*data = dbuf;
return n;
}
/*
* At this point the decompressor should
* be expecting to see the 0, 0, ff, ff bytes.
*/
if (!inflateSyncPoint(&rx_strm)) {
rprintf(FERROR, "decompressor lost sync!\n");
exit_cleanup(RERR_STREAMIO);
}
rx_strm.avail_in = 4;
rx_strm.next_in = (Bytef *)cbuf;
cbuf[0] = cbuf[1] = 0;
cbuf[2] = cbuf[3] = 0xff;
inflate(&rx_strm, Z_SYNC_FLUSH);
recv_state = r_idle;
}
if (flag == END_FLAG) {
/* that's all folks */
recv_state = r_init;
return 0;
}
/* here we have a token of some kind */
if (flag & TOKEN_REL) {
rx_token += flag & 0x3f;
flag >>= 6;
} else
rx_token = read_int(f);
if (flag & 1) {
rx_run = read_byte(f);
rx_run += read_byte(f) << 8;
recv_state = r_running;
}
return -1 - rx_token;
case r_inflating:
rx_strm.next_out = (Bytef *)dbuf;
rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
r = inflate(&rx_strm, Z_NO_FLUSH);
n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
if (r != Z_OK) {
rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
exit_cleanup(RERR_STREAMIO);
}
if (rx_strm.avail_in == 0)
recv_state = r_inflated;
if (n != 0) {
*data = dbuf;
return n;
}
break;
case r_running:
++rx_token;
if (--rx_run == 0)
recv_state = r_idle;
return -1 - rx_token;
}
}
}
/*
* put the data corresponding to a token that we've just returned
* from recv_deflated_token into the decompressor's history buffer.
*/
static void see_deflate_token(char *buf, int32 len)
{
#ifndef EXTERNAL_ZLIB
int r;
int32 blklen;
unsigned char hdr[5];
rx_strm.avail_in = 0;
blklen = 0;
hdr[0] = 0;
do {
if (rx_strm.avail_in == 0 && len != 0) {
if (blklen == 0) {
/* Give it a fake stored-block header. */
rx_strm.next_in = (Bytef *)hdr;
rx_strm.avail_in = 5;
blklen = len;
if (blklen > 0xffff)
blklen = 0xffff;
hdr[1] = blklen;
hdr[2] = blklen >> 8;
hdr[3] = ~hdr[1];
hdr[4] = ~hdr[2];
} else {
rx_strm.next_in = (Bytef *)buf;
rx_strm.avail_in = blklen;
if (protocol_version >= 31) /* Newer protocols avoid a data-duplicating bug */
buf += blklen;
len -= blklen;
blklen = 0;
}
}
rx_strm.next_out = (Bytef *)dbuf;
rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
r = inflate(&rx_strm, Z_SYNC_FLUSH);
if (r != Z_OK && r != Z_BUF_ERROR) {
rprintf(FERROR, "inflate (token) returned %d\n", r);
exit_cleanup(RERR_STREAMIO);
}
} while (len || rx_strm.avail_out == 0);
#else
buf++; len++;
rprintf(FERROR, "Impossible error in external-zlib code (2).\n");
exit_cleanup(RERR_STREAMIO);
#endif
}
/**
* Transmit a verbatim buffer of length @p n followed by a token.
* If token == -1 then we have reached EOF
* If n == 0 then don't send a buffer
*/
void send_token(int f, int32 token, struct map_struct *buf, OFF_T offset,
int32 n, int32 toklen)
{
if (!do_compression)
simple_send_token(f, token, buf, offset, n);
else
send_deflated_token(f, token, buf, offset, n, toklen);
}
/*
* receive a token or buffer from the other end. If the reurn value is >0 then
* it is a data buffer of that length, and *data will point at the data.
* if the return value is -i then it represents token i-1
* if the return value is 0 then the end has been reached
*/
int32 recv_token(int f, char **data)
{
int tok;
if (!do_compression) {
tok = simple_recv_token(f,data);
} else {
tok = recv_deflated_token(f, data);
}
return tok;
}
/*
* look at the data corresponding to a token, if necessary
*/
void see_token(char *data, int32 toklen)
{
if (do_compression == 1)
see_deflate_token(data, toklen);
}