/*
* Socket and pipe I/O utilities used in rsync.
*
* Copyright (C) 1996-2001 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2009 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.
*/
/* Rsync provides its own multiplexing system, which is used to send
* stderr and stdout over a single socket.
*
* For historical reasons this is off during the start of the
* connection, but it's switched on quite early using
* io_start_multiplex_out() and io_start_multiplex_in(). */
#include "rsync.h"
#include "ifuncs.h"
/** If no timeout is specified then use a 60 second select timeout */
#define SELECT_TIMEOUT 60
extern int bwlimit;
extern size_t bwlimit_writemax;
extern int io_timeout;
extern int am_server;
extern int am_daemon;
extern int am_sender;
extern int am_generator;
extern int inc_recurse;
extern int io_error;
extern int eol_nulls;
extern int flist_eof;
extern int list_only;
extern int read_batch;
extern int compat_flags;
extern int protect_args;
extern int checksum_seed;
extern int protocol_version;
extern int remove_source_files;
extern int preserve_hard_links;
extern struct stats stats;
extern struct file_list *cur_flist;
#ifdef ICONV_OPTION
extern int filesfrom_convert;
extern iconv_t ic_send, ic_recv;
#endif
int csum_length = SHORT_SUM_LENGTH; /* initial value */
int allowed_lull = 0;
int ignore_timeout = 0;
int batch_fd = -1;
int msgdone_cnt = 0;
/* Ignore an EOF error if non-zero. See whine_about_eof(). */
int kluge_around_eof = 0;
int msg_fd_in = -1;
int msg_fd_out = -1;
int sock_f_in = -1;
int sock_f_out = -1;
static int iobuf_f_in = -1;
static char *iobuf_in;
static size_t iobuf_in_siz;
static size_t iobuf_in_ndx;
static size_t iobuf_in_remaining;
static int iobuf_f_out = -1;
static char *iobuf_out;
static int iobuf_out_cnt;
int flist_forward_from = -1;
static int io_multiplexing_out;
static int io_multiplexing_in;
static time_t last_io_in;
static time_t last_io_out;
static int no_flush;
static int write_batch_monitor_in = -1;
static int write_batch_monitor_out = -1;
static int io_filesfrom_f_in = -1;
static int io_filesfrom_f_out = -1;
static xbuf ff_buf = EMPTY_XBUF;
static char ff_lastchar;
#ifdef ICONV_OPTION
static xbuf iconv_buf = EMPTY_XBUF;
#endif
static int defer_forwarding_messages = 0, keep_defer_forwarding = 0;
static int select_timeout = SELECT_TIMEOUT;
static int active_filecnt = 0;
static OFF_T active_bytecnt = 0;
static int first_message = 1;
static char int_byte_extra[64] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */
};
#define REMOTE_OPTION_ERROR "rsync: on remote machine: -"
#define REMOTE_OPTION_ERROR2 ": unknown option"
enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND };
static void check_timeout(void)
{
time_t t, chk;
if (!io_timeout || ignore_timeout)
return;
t = time(NULL);
if (!last_io_in)
last_io_in = t;
chk = MAX(last_io_out, last_io_in);
if (t - chk >= io_timeout) {
if (am_server || am_daemon)
exit_cleanup(RERR_TIMEOUT);
rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n",
who_am_i(), (int)(t-chk));
exit_cleanup(RERR_TIMEOUT);
}
}
static void readfd(int fd, char *buffer, size_t N);
static void writefd(int fd, const char *buf, size_t len);
static void writefd_unbuffered(int fd, const char *buf, size_t len);
static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert);
static flist_ndx_list redo_list, hlink_list;
struct msg_list_item {
struct msg_list_item *next;
char convert;
char buf[1];
};
struct msg_list {
struct msg_list_item *head, *tail;
};
static struct msg_list msg_queue;
static void got_flist_entry_status(enum festatus status, const char *buf)
{
int ndx = IVAL(buf, 0);
struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status");
if (remove_source_files) {
active_filecnt--;
active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]);
}
if (inc_recurse)
flist->in_progress--;
switch (status) {
case FES_SUCCESS:
if (remove_source_files)
send_msg(MSG_SUCCESS, buf, 4, 0);
/* FALL THROUGH */
case FES_NO_SEND:
#ifdef SUPPORT_HARD_LINKS
if (preserve_hard_links) {
struct file_struct *file = flist->files[ndx - flist->ndx_start];
if (F_IS_HLINKED(file)) {
if (status == FES_NO_SEND)
flist_ndx_push(&hlink_list, -2); /* indicates a failure follows */
flist_ndx_push(&hlink_list, ndx);
flist->in_progress++;
}
}
#endif
break;
case FES_REDO:
if (read_batch) {
if (inc_recurse)
flist->in_progress++;
break;
}
if (inc_recurse)
flist->to_redo++;
flist_ndx_push(&redo_list, ndx);
break;
}
}
/* Note the fds used for the main socket (which might really be a pipe
* for a local transfer, but we can ignore that). */
void io_set_sock_fds(int f_in, int f_out)
{
sock_f_in = f_in;
sock_f_out = f_out;
}
void set_io_timeout(int secs)
{
io_timeout = secs;
allowed_lull = (io_timeout + 1) / 2;
if (!io_timeout || allowed_lull > SELECT_TIMEOUT)
select_timeout = SELECT_TIMEOUT;
else
select_timeout = allowed_lull;
if (read_batch)
allowed_lull = 0;
}
/* Setup the fd used to receive MSG_* messages. Only needed during the
* early stages of being a local sender (up through the sending of the
* file list) or when we're the generator (to fetch the messages from
* the receiver). */
void set_msg_fd_in(int fd)
{
msg_fd_in = fd;
}
/* Setup the fd used to send our MSG_* messages. Only needed when
* we're the receiver (to send our messages to the generator). */
void set_msg_fd_out(int fd)
{
msg_fd_out = fd;
set_nonblocking(msg_fd_out);
}
/* Add a message to the pending MSG_* list. */
static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert)
{
struct msg_list_item *m;
int sz = len + 4 + sizeof m[0] - 1;
if (!(m = (struct msg_list_item *)new_array(char, sz)))
out_of_memory("msg_list_add");
m->next = NULL;
m->convert = convert;
SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len);
memcpy(m->buf + 4, buf, len);
if (lst->tail)
lst->tail->next = m;
else
lst->head = m;
lst->tail = m;
}
static inline int flush_a_msg(int fd)
{
struct msg_list_item *m = msg_queue.head;
int len = IVAL(m->buf, 0) & 0xFFFFFF;
int tag = *((uchar*)m->buf+3) - MPLEX_BASE;
if (!(msg_queue.head = m->next))
msg_queue.tail = NULL;
defer_forwarding_messages++;
mplex_write(fd, tag, m->buf + 4, len, m->convert);
defer_forwarding_messages--;
free(m);
return len;
}
static void msg_flush(void)
{
if (am_generator) {
while (msg_queue.head && io_multiplexing_out)
stats.total_written += flush_a_msg(sock_f_out) + 4;
} else {
while (msg_queue.head)
(void)flush_a_msg(msg_fd_out);
}
}
static void check_for_d_option_error(const char *msg)
{
static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz";
char *colon;
int saw_d = 0;
if (*msg != 'r'
|| strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0)
return;
msg += sizeof REMOTE_OPTION_ERROR - 1;
if (*msg == '-' || (colon = strchr(msg, ':')) == NULL
|| strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0)
return;
for ( ; *msg != ':'; msg++) {
if (*msg == 'd')
saw_d = 1;
else if (*msg == 'e')
break;
else if (strchr(rsync263_opts, *msg) == NULL)
return;
}
if (saw_d) {
rprintf(FWARNING,
"*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n");
}
}
/* Read a message from the MSG_* fd and handle it. This is called either
* during the early stages of being a local sender (up through the sending
* of the file list) or when we're the generator (to fetch the messages
* from the receiver). */
static void read_msg_fd(void)
{
char buf[2048];
size_t n;
struct file_list *flist;
int fd = msg_fd_in;
int tag, len;
/* Temporarily disable msg_fd_in. This is needed to avoid looping back
* to this routine from writefd_unbuffered(). */
no_flush++;
msg_fd_in = -1;
defer_forwarding_messages++;
readfd(fd, buf, 4);
tag = IVAL(buf, 0);
len = tag & 0xFFFFFF;
tag = (tag >> 24) - MPLEX_BASE;
switch (tag) {
case MSG_DONE:
if (len < 0 || len > 1 || !am_generator) {
invalid_msg:
rprintf(FERROR, "invalid message %d:%d [%s%s]\n",
tag, len, who_am_i(),
inc_recurse ? "/inc" : "");
exit_cleanup(RERR_STREAMIO);
}
if (len) {
readfd(fd, buf, len);
stats.total_read = read_varlong(fd, 3);
}
msgdone_cnt++;
break;
case MSG_REDO:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_REDO, buf);
break;
case MSG_FLIST:
if (len != 4 || !am_generator || !inc_recurse)
goto invalid_msg;
readfd(fd, buf, 4);
/* Read extra file list from receiver. */
assert(iobuf_in != NULL);
assert(iobuf_f_in == fd);
if (verbose > 3) {
rprintf(FINFO, "[%s] receiving flist for dir %d\n",
who_am_i(), IVAL(buf,0));
}
flist = recv_file_list(fd);
flist->parent_ndx = IVAL(buf,0);
#ifdef SUPPORT_HARD_LINKS
if (preserve_hard_links)
match_hard_links(flist);
#endif
break;
case MSG_FLIST_EOF:
if (len != 0 || !am_generator || !inc_recurse)
goto invalid_msg;
flist_eof = 1;
break;
case MSG_IO_ERROR:
if (len != 4)
goto invalid_msg;
readfd(fd, buf, len);
io_error |= IVAL(buf, 0);
break;
case MSG_DELETED:
if (len >= (int)sizeof buf || !am_generator)
goto invalid_msg;
readfd(fd, buf, len);
send_msg(MSG_DELETED, buf, len, 1);
break;
case MSG_SUCCESS:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_SUCCESS, buf);
break;
case MSG_NO_SEND:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_NO_SEND, buf);
break;
case MSG_ERROR_SOCKET:
case MSG_ERROR_UTF8:
case MSG_CLIENT:
if (!am_generator)
goto invalid_msg;
if (tag == MSG_ERROR_SOCKET)
io_end_multiplex_out();
/* FALL THROUGH */
case MSG_INFO:
case MSG_ERROR:
case MSG_ERROR_XFER:
case MSG_WARNING:
case MSG_LOG:
while (len) {
n = len;
if (n >= sizeof buf)
n = sizeof buf - 1;
readfd(fd, buf, n);
rwrite((enum logcode)tag, buf, n, !am_generator);
len -= n;
}
break;
default:
rprintf(FERROR, "unknown message %d:%d [%s]\n",
tag, len, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
no_flush--;
msg_fd_in = fd;
if (!--defer_forwarding_messages && !no_flush)
msg_flush();
}
/* This is used by the generator to limit how many file transfers can
* be active at once when --remove-source-files is specified. Without
* this, sender-side deletions were mostly happening at the end. */
void increment_active_files(int ndx, int itemizing, enum logcode code)
{
while (1) {
/* TODO: tune these limits? */
int limit = active_bytecnt >= 128*1024 ? 10 : 50;
if (active_filecnt < limit)
break;
check_for_finished_files(itemizing, code, 0);
if (active_filecnt < limit)
break;
if (iobuf_out_cnt)
io_flush(NORMAL_FLUSH);
else
read_msg_fd();
}
active_filecnt++;
active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]);
}
/* Write an message to a multiplexed stream. If this fails, rsync exits. */
static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert)
{
char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */
size_t n = len;
#ifdef ICONV_OPTION
/* We need to convert buf before doing anything else so that we
* can include the (converted) byte length in the message header. */
if (convert && ic_send != (iconv_t)-1) {
xbuf outbuf, inbuf;
INIT_XBUF(outbuf, buffer + 4, 0, sizeof buffer - 4);
INIT_XBUF(inbuf, (char*)buf, len, -1);
iconvbufs(ic_send, &inbuf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
if (inbuf.len > 0) {
rprintf(FERROR, "overflowed conversion buffer in mplex_write");
exit_cleanup(RERR_UNSUPPORTED);
}
n = len = outbuf.len;
} else
#endif
if (n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */
n = 0; /* We'd rather do 2 writes than too much memcpy(). */
else
memcpy(buffer + 4, buf, n);
SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
keep_defer_forwarding++; /* defer_forwarding_messages++ on return */
writefd_unbuffered(fd, buffer, n+4);
keep_defer_forwarding--;
if (len > n)
writefd_unbuffered(fd, buf+n, len-n);
if (!--defer_forwarding_messages && !no_flush)
msg_flush();
}
int send_msg(enum msgcode code, const char *buf, int len, int convert)
{
if (msg_fd_out < 0) {
if (!defer_forwarding_messages)
return io_multiplex_write(code, buf, len, convert);
if (!io_multiplexing_out)
return 0;
msg_list_add(&msg_queue, code, buf, len, convert);
return 1;
}
if (flist_forward_from >= 0)
msg_list_add(&msg_queue, code, buf, len, convert);
else
mplex_write(msg_fd_out, code, buf, len, convert);
return 1;
}
void send_msg_int(enum msgcode code, int num)
{
char numbuf[4];
SIVAL(numbuf, 0, num);
send_msg(code, numbuf, 4, 0);
}
void wait_for_receiver(void)
{
if (io_flush(NORMAL_FLUSH))
return;
read_msg_fd();
}
int get_redo_num(void)
{
return flist_ndx_pop(&redo_list);
}
int get_hlink_num(void)
{
return flist_ndx_pop(&hlink_list);
}
/**
* When we're the receiver and we have a local --files-from list of names
* that needs to be sent over the socket to the sender, we have to do two
* things at the same time: send the sender a list of what files we're
* processing and read the incoming file+info list from the sender. We do
* this by augmenting the read_timeout() function to copy this data. It
* uses ff_buf to read a block of data from f_in (when it is ready, since
* it might be a pipe) and then blast it out f_out (when it is ready to
* receive more data).
*/
void io_set_filesfrom_fds(int f_in, int f_out)
{
io_filesfrom_f_in = f_in;
io_filesfrom_f_out = f_out;
alloc_xbuf(&ff_buf, 2048);
#ifdef ICONV_OPTION
if (protect_args)
alloc_xbuf(&iconv_buf, 1024);
#endif
}
/* It's almost always an error to get an EOF when we're trying to read from the
* network, because the protocol is (for the most part) self-terminating.
*
* There is one case for the receiver when it is at the end of the transfer
* (hanging around reading any keep-alive packets that might come its way): if
* the sender dies before the generator's kill-signal comes through, we can end
* up here needing to loop until the kill-signal arrives. In this situation,
* kluge_around_eof will be < 0.
*
* There is another case for older protocol versions (< 24) where the module
* listing was not terminated, so we must ignore an EOF error in that case and
* exit. In this situation, kluge_around_eof will be > 0. */
static void whine_about_eof(int fd)
{
if (kluge_around_eof && fd == sock_f_in) {
int i;
if (kluge_around_eof > 0)
exit_cleanup(0);
/* If we're still here after 10 seconds, exit with an error. */
for (i = 10*1000/20; i--; )
msleep(20);
}
rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
"(%.0f bytes received so far) [%s]\n",
(double)stats.total_read, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
/**
* Read from a socket with I/O timeout. return the number of bytes
* read. If no bytes can be read then exit, never return a number <= 0.
*
* TODO: If the remote shell connection fails, then current versions
* actually report an "unexpected EOF" error here. Since it's a
* fairly common mistake to try to use rsh when ssh is required, we
* should trap that: if we fail to read any data at all, we should
* give a better explanation. We can tell whether the connection has
* started by looking e.g. at whether the remote version is known yet.
*/
static int read_timeout(int fd, char *buf, size_t len)
{
int n, cnt = 0;
io_flush(FULL_FLUSH);
while (cnt == 0) {
/* until we manage to read *something* */
fd_set r_fds, w_fds;
struct timeval tv;
int maxfd = fd;
int count;
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
FD_SET(fd, &r_fds);
if (io_filesfrom_f_out >= 0) {
int new_fd;
if (ff_buf.len == 0) {
if (io_filesfrom_f_in >= 0) {
FD_SET(io_filesfrom_f_in, &r_fds);
new_fd = io_filesfrom_f_in;
} else {
io_filesfrom_f_out = -1;
new_fd = -1;
}
} else {
FD_SET(io_filesfrom_f_out, &w_fds);
new_fd = io_filesfrom_f_out;
}
if (new_fd > maxfd)
maxfd = new_fd;
}
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
errno = 0;
count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
if (count <= 0) {
if (errno == EBADF) {
defer_forwarding_messages = 0;
exit_cleanup(RERR_SOCKETIO);
}
check_timeout();
continue;
}
if (io_filesfrom_f_out >= 0) {
if (ff_buf.len) {
if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {
int l = write(io_filesfrom_f_out,
ff_buf.buf + ff_buf.pos,
ff_buf.len);
if (l > 0) {
if (!(ff_buf.len -= l))
ff_buf.pos = 0;
else
ff_buf.pos += l;
} else if (errno != EINTR) {
/* XXX should we complain? */
io_filesfrom_f_out = -1;
}
}
} else if (io_filesfrom_f_in >= 0) {
if (FD_ISSET(io_filesfrom_f_in, &r_fds)) {
#ifdef ICONV_OPTION
xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf;
#else
xbuf *ibuf = &ff_buf;
#endif
int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size);
if (l <= 0) {
if (l == 0 || errno != EINTR) {
/* Send end-of-file marker */
memcpy(ff_buf.buf, "\0\0", 2);
ff_buf.len = ff_lastchar? 2 : 1;
ff_buf.pos = 0;
io_filesfrom_f_in = -1;
}
} else {
#ifdef ICONV_OPTION
if (filesfrom_convert) {
iconv_buf.pos = 0;
iconv_buf.len = l;
iconvbufs(ic_send, &iconv_buf, &ff_buf,
ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE);
l = ff_buf.len;
}
#endif
if (!eol_nulls) {
char *s = ff_buf.buf + l;
/* Transform CR and/or LF into '\0' */
while (s-- > ff_buf.buf) {
if (*s == '\n' || *s == '\r')
*s = '\0';
}
}
if (!ff_lastchar) {
/* Last buf ended with a '\0', so don't
* let this buf start with one. */
while (l && ff_buf.buf[ff_buf.pos] == '\0')
ff_buf.pos++, l--;
}
if (!l)
ff_buf.pos = 0;
else {
char *f = ff_buf.buf + ff_buf.pos;
char *t = f;
char *eob = f + l;
/* Eliminate any multi-'\0' runs. */
while (f != eob) {
if (!(*t++ = *f++)) {
while (f != eob && !*f)
f++, l--;
}
}
ff_lastchar = f[-1];
}
ff_buf.len = l;
}
}
}
}
if (!FD_ISSET(fd, &r_fds))
continue;
n = read(fd, buf, len);
if (n <= 0) {
if (n == 0)
whine_about_eof(fd); /* Doesn't return. */
if (errno == EINTR || errno == EWOULDBLOCK
|| errno == EAGAIN)
continue;
/* Don't write errors on a dead socket. */
if (fd == sock_f_in) {
io_end_multiplex_out();
rsyserr(FERROR_SOCKET, errno, "read error");
} else
rsyserr(FERROR, errno, "read error");
exit_cleanup(RERR_STREAMIO);
}
buf += n;
len -= n;
cnt += n;
if (fd == sock_f_in && io_timeout)
last_io_in = time(NULL);
}
return cnt;
}
/* Read a line into the "buf" buffer. */
int read_line(int fd, char *buf, size_t bufsiz, int flags)
{
char ch, *s, *eob;
int cnt;
#ifdef ICONV_OPTION
if (flags & RL_CONVERT && iconv_buf.size < bufsiz)
realloc_xbuf(&iconv_buf, bufsiz + 1024);
#endif
start:
#ifdef ICONV_OPTION
s = flags & RL_CONVERT ? iconv_buf.buf : buf;
#else
s = buf;
#endif
eob = s + bufsiz - 1;
while (1) {
cnt = read(fd, &ch, 1);
if (cnt < 0 && (errno == EWOULDBLOCK
|| errno == EINTR || errno == EAGAIN)) {
struct timeval tv;
fd_set r_fds, e_fds;
FD_ZERO(&r_fds);
FD_SET(fd, &r_fds);
FD_ZERO(&e_fds);
FD_SET(fd, &e_fds);
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
if (!select(fd+1, &r_fds, NULL, &e_fds, &tv))
check_timeout();
/*if (FD_ISSET(fd, &e_fds))
rprintf(FINFO, "select exception on fd %d\n", fd); */
continue;
}
if (cnt != 1)
break;
if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) {
/* Skip empty lines if dumping comments. */
if (flags & RL_DUMP_COMMENTS && s == buf)
continue;
break;
}
if (s < eob)
*s++ = ch;
}
*s = '\0';
if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';'))
goto start;
#ifdef ICONV_OPTION
if (flags & RL_CONVERT) {
xbuf outbuf;
INIT_XBUF(outbuf, buf, 0, bufsiz);
iconv_buf.pos = 0;
iconv_buf.len = s - iconv_buf.buf;
iconvbufs(ic_recv, &iconv_buf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
outbuf.buf[outbuf.len] = '\0';
return outbuf.len;
}
#endif
return s - buf;
}
void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls,
char ***argv_p, int *argc_p, char **request_p)
{
int maxargs = MAX_ARGS;
int dot_pos = 0;
int argc = 0;
char **argv, *p;
int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0);
#ifdef ICONV_OPTION
rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0);
#endif
if (!(argv = new_array(char *, maxargs)))
out_of_memory("read_args");
if (mod_name && !protect_args)
argv[argc++] = "rsyncd";
while (1) {
if (read_line(f_in, buf, bufsiz, rl_flags) == 0)
break;
if (argc == maxargs-1) {
maxargs += MAX_ARGS;
if (!(argv = realloc_array(argv, char *, maxargs)))
out_of_memory("read_args");
}
if (dot_pos) {
if (request_p) {
*request_p = strdup(buf);
request_p = NULL;
}
if (mod_name)
glob_expand_module(mod_name, buf, &argv, &argc, &maxargs);
else
glob_expand(buf, &argv, &argc, &maxargs);
} else {
if (!(p = strdup(buf)))
out_of_memory("read_args");
argv[argc++] = p;
if (*p == '.' && p[1] == '\0')
dot_pos = argc;
}
}
argv[argc] = NULL;
glob_expand(NULL, NULL, NULL, NULL);
*argc_p = argc;
*argv_p = argv;
}
int io_start_buffering_out(int f_out)
{
if (iobuf_out) {
assert(f_out == iobuf_f_out);
return 0;
}
if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE)))
out_of_memory("io_start_buffering_out");
iobuf_out_cnt = 0;
iobuf_f_out = f_out;
return 1;
}
int io_start_buffering_in(int f_in)
{
if (iobuf_in) {
assert(f_in == iobuf_f_in);
return 0;
}
iobuf_in_siz = 2 * IO_BUFFER_SIZE;
if (!(iobuf_in = new_array(char, iobuf_in_siz)))
out_of_memory("io_start_buffering_in");
iobuf_f_in = f_in;
return 1;
}
void io_end_buffering_in(void)
{
if (!iobuf_in)
return;
free(iobuf_in);
iobuf_in = NULL;
iobuf_in_ndx = 0;
iobuf_in_remaining = 0;
iobuf_f_in = -1;
}
void io_end_buffering_out(void)
{
if (!iobuf_out)
return;
io_flush(FULL_FLUSH);
free(iobuf_out);
iobuf_out = NULL;
iobuf_f_out = -1;
}
void maybe_flush_socket(int important)
{
if (iobuf_out && iobuf_out_cnt
&& (important || time(NULL) - last_io_out >= 5))
io_flush(NORMAL_FLUSH);
}
void maybe_send_keepalive(void)
{
if (time(NULL) - last_io_out >= allowed_lull) {
if (!iobuf_out || !iobuf_out_cnt) {
if (protocol_version < 29)
send_msg(MSG_DATA, "", 0, 0);
else if (protocol_version >= 30)
send_msg(MSG_NOOP, "", 0, 0);
else {
write_int(sock_f_out, cur_flist->used);
write_shortint(sock_f_out, ITEM_IS_NEW);
}
}
if (iobuf_out)
io_flush(NORMAL_FLUSH);
}
}
void start_flist_forward(int f_in)
{
assert(iobuf_out != NULL);
assert(iobuf_f_out == msg_fd_out);
flist_forward_from = f_in;
defer_forwarding_messages++;
}
void stop_flist_forward(void)
{
flist_forward_from = -1;
defer_forwarding_messages--;
io_flush(FULL_FLUSH);
}
/**
* Continue trying to read len bytes - don't return until len has been
* read.
**/
static void read_loop(int fd, char *buf, size_t len)
{
while (len) {
int n = read_timeout(fd, buf, len);
buf += n;
len -= n;
}
}
/**
* Read from the file descriptor handling multiplexing - return number
* of bytes read.
*
* Never returns <= 0.
*/
static int readfd_unbuffered(int fd, char *buf, size_t len)
{
size_t msg_bytes;
int tag, cnt = 0;
char line[BIGPATHBUFLEN];
if (!iobuf_in || fd != iobuf_f_in)
return read_timeout(fd, buf, len);
if (!io_multiplexing_in && iobuf_in_remaining == 0) {
iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz);
iobuf_in_ndx = 0;
}
while (cnt == 0) {
if (iobuf_in_remaining) {
len = MIN(len, iobuf_in_remaining);
memcpy(buf, iobuf_in + iobuf_in_ndx, len);
iobuf_in_ndx += len;
iobuf_in_remaining -= len;
cnt = len;
break;
}
read_loop(fd, line, 4);
tag = IVAL(line, 0);
msg_bytes = tag & 0xFFFFFF;
tag = (tag >> 24) - MPLEX_BASE;
switch (tag) {
case MSG_DATA:
if (msg_bytes > iobuf_in_siz) {
if (!(iobuf_in = realloc_array(iobuf_in, char,
msg_bytes)))
out_of_memory("readfd_unbuffered");
iobuf_in_siz = msg_bytes;
}
read_loop(fd, iobuf_in, msg_bytes);
iobuf_in_remaining = msg_bytes;
iobuf_in_ndx = 0;
break;
case MSG_NOOP:
if (msg_bytes != 0)
goto invalid_msg;
if (am_sender)
maybe_send_keepalive();
break;
case MSG_IO_ERROR:
if (msg_bytes != 4)
goto invalid_msg;
read_loop(fd, line, msg_bytes);
send_msg_int(MSG_IO_ERROR, IVAL(line, 0));
io_error |= IVAL(line, 0);
break;
case MSG_DELETED:
if (msg_bytes >= sizeof line)
goto overflow;
#ifdef ICONV_OPTION
if (ic_recv != (iconv_t)-1) {
xbuf outbuf, inbuf;
char ibuf[512];
int add_null = 0;
INIT_CONST_XBUF(outbuf, line);
INIT_XBUF(inbuf, ibuf, 0, -1);
while (msg_bytes) {
inbuf.len = msg_bytes > sizeof ibuf
? sizeof ibuf : msg_bytes;
read_loop(fd, inbuf.buf, inbuf.len);
if (!(msg_bytes -= inbuf.len)
&& !ibuf[inbuf.len-1])
inbuf.len--, add_null = 1;
if (iconvbufs(ic_send, &inbuf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE) < 0)
goto overflow;
}
if (add_null) {
if (outbuf.len == outbuf.size)
goto overflow;
outbuf.buf[outbuf.len++] = '\0';
}
msg_bytes = outbuf.len;
} else
#endif
read_loop(fd, line, msg_bytes);
/* A directory name was sent with the trailing null */
if (msg_bytes > 0 && !line[msg_bytes-1])
log_delete(line, S_IFDIR);
else {
line[msg_bytes] = '\0';
log_delete(line, S_IFREG);
}
break;
case MSG_SUCCESS:
if (msg_bytes != 4) {
invalid_msg:
rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n",
tag, (long)msg_bytes, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, line, msg_bytes);
successful_send(IVAL(line, 0));
break;
case MSG_NO_SEND:
if (msg_bytes != 4)
goto invalid_msg;
read_loop(fd, line, msg_bytes);
send_msg_int(MSG_NO_SEND, IVAL(line, 0));
break;
case MSG_INFO:
case MSG_ERROR:
case MSG_ERROR_XFER:
case MSG_WARNING:
if (msg_bytes >= sizeof line) {
overflow:
rprintf(FERROR,
"multiplexing overflow %d:%ld [%s]\n",
tag, (long)msg_bytes, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, line, msg_bytes);
rwrite((enum logcode)tag, line, msg_bytes, 1);
if (first_message) {
if (list_only && !am_sender && tag == 1) {
line[msg_bytes] = '\0';
check_for_d_option_error(line);
}
first_message = 0;
}
break;
default:
rprintf(FERROR, "unexpected tag %d [%s]\n",
tag, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
}
if (iobuf_in_remaining == 0)
io_flush(NORMAL_FLUSH);
return cnt;
}
/* Do a buffered read from fd. Don't return until all N bytes have
* been read. If all N can't be read then exit with an error. */
static void readfd(int fd, char *buffer, size_t N)
{
int cnt;
size_t total = 0;
while (total < N) {
cnt = readfd_unbuffered(fd, buffer + total, N-total);
total += cnt;
}
if (fd == write_batch_monitor_in) {
if ((size_t)write(batch_fd, buffer, total) != total)
exit_cleanup(RERR_FILEIO);
}
if (fd == flist_forward_from)
writefd(iobuf_f_out, buffer, total);
if (fd == sock_f_in)
stats.total_read += total;
}
unsigned short read_shortint(int f)
{
char b[2];
readfd(f, b, 2);
return (UVAL(b, 1) << 8) + UVAL(b, 0);
}
int32 read_int(int f)
{
char b[4];
int32 num;
readfd(f, b, 4);
num = IVAL(b, 0);
#if SIZEOF_INT32 > 4
if (num & (int32)0x80000000)
num |= ~(int32)0xffffffff;
#endif
return num;
}
int32 read_varint(int f)
{
union {
char b[5];
int32 x;
} u;
uchar ch;
int extra;
u.x = 0;
readfd(f, (char*)&ch, 1);
extra = int_byte_extra[ch / 4];
if (extra) {
uchar bit = ((uchar)1<<(8-extra));
if (extra >= (int)sizeof u.b) {
rprintf(FERROR, "Overflow in read_varint()\n");
exit_cleanup(RERR_STREAMIO);
}
readfd(f, u.b, extra);
u.b[extra] = ch & (bit-1);
} else
u.b[0] = ch;
#if CAREFUL_ALIGNMENT
u.x = IVAL(u.b,0);
#endif
#if SIZEOF_INT32 > 4
if (u.x & (int32)0x80000000)
u.x |= ~(int32)0xffffffff;
#endif
return u.x;
}
int64 read_varlong(int f, uchar min_bytes)
{
union {
char b[9];
int64 x;
} u;
char b2[8];
int extra;
#if SIZEOF_INT64 < 8
memset(u.b, 0, 8);
#else
u.x = 0;
#endif
readfd(f, b2, min_bytes);
memcpy(u.b, b2+1, min_bytes-1);
extra = int_byte_extra[CVAL(b2, 0) / 4];
if (extra) {
uchar bit = ((uchar)1<<(8-extra));
if (min_bytes + extra > (int)sizeof u.b) {
rprintf(FERROR, "Overflow in read_varlong()\n");
exit_cleanup(RERR_STREAMIO);
}
readfd(f, u.b + min_bytes - 1, extra);
u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1);
#if SIZEOF_INT64 < 8
if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) {
rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
exit_cleanup(RERR_UNSUPPORTED);
}
#endif
} else
u.b[min_bytes + extra - 1] = CVAL(b2, 0);
#if SIZEOF_INT64 < 8
u.x = IVAL(u.b,0);
#elif CAREFUL_ALIGNMENT
u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32);
#endif
return u.x;
}
int64 read_longint(int f)
{
#if SIZEOF_INT64 >= 8
char b[9];
#endif
int32 num = read_int(f);
if (num != (int32)0xffffffff)
return num;
#if SIZEOF_INT64 < 8
rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
exit_cleanup(RERR_UNSUPPORTED);
#else
readfd(f, b, 8);
return IVAL(b,0) | (((int64)IVAL(b,4))<<32);
#endif
}
void read_buf(int f, char *buf, size_t len)
{
readfd(f,buf,len);
}
void read_sbuf(int f, char *buf, size_t len)
{
readfd(f, buf, len);
buf[len] = '\0';
}
uchar read_byte(int f)
{
uchar c;
readfd(f, (char *)&c, 1);
return c;
}
int read_vstring(int f, char *buf, int bufsize)
{
int len = read_byte(f);
if (len & 0x80)
len = (len & ~0x80) * 0x100 + read_byte(f);
if (len >= bufsize) {
rprintf(FERROR, "over-long vstring received (%d > %d)\n",
len, bufsize - 1);
return -1;
}
if (len)
readfd(f, buf, len);
buf[len] = '\0';
return len;
}
/* Populate a sum_struct with values from the socket. This is
* called by both the sender and the receiver. */
void read_sum_head(int f, struct sum_struct *sum)
{
int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE;
sum->count = read_int(f);
if (sum->count < 0) {
rprintf(FERROR, "Invalid checksum count %ld [%s]\n",
(long)sum->count, who_am_i());
exit_cleanup(RERR_PROTOCOL);
}
sum->blength = read_int(f);
if (sum->blength < 0 || sum->blength > max_blength) {
rprintf(FERROR, "Invalid block length %ld [%s]\n",
(long)sum->blength, who_am_i());
exit_cleanup(RERR_PROTOCOL);
}
sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f);
if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) {
rprintf(FERROR, "Invalid checksum length %d [%s]\n",
sum->s2length, who_am_i());
exit_cleanup(RERR_PROTOCOL);
}
sum->remainder = read_int(f);
if (sum->remainder < 0 || sum->remainder > sum->blength) {
rprintf(FERROR, "Invalid remainder length %ld [%s]\n",
(long)sum->remainder, who_am_i());
exit_cleanup(RERR_PROTOCOL);
}
}
/* Send the values from a sum_struct over the socket. Set sum to
* NULL if there are no checksums to send. This is called by both
* the generator and the sender. */
void write_sum_head(int f, struct sum_struct *sum)
{
static struct sum_struct null_sum;
if (sum == NULL)
sum = &null_sum;
write_int(f, sum->count);
write_int(f, sum->blength);
if (protocol_version >= 27)
write_int(f, sum->s2length);
write_int(f, sum->remainder);
}
/**
* Sleep after writing to limit I/O bandwidth usage.
*
* @todo Rather than sleeping after each write, it might be better to
* use some kind of averaging. The current algorithm seems to always
* use a bit less bandwidth than specified, because it doesn't make up
* for slow periods. But arguably this is a feature. In addition, we
* ought to take the time used to write the data into account.
*
* During some phases of big transfers (file FOO is uptodate) this is
* called with a small bytes_written every time. As the kernel has to
* round small waits up to guarantee that we actually wait at least the
* requested number of microseconds, this can become grossly inaccurate.
* We therefore keep track of the bytes we've written over time and only
* sleep when the accumulated delay is at least 1 tenth of a second.
**/
static void sleep_for_bwlimit(int bytes_written)
{
static struct timeval prior_tv;
static long total_written = 0;
struct timeval tv, start_tv;
long elapsed_usec, sleep_usec;
#define ONE_SEC 1000000L /* # of microseconds in a second */
if (!bwlimit_writemax)
return;
total_written += bytes_written;
gettimeofday(&start_tv, NULL);
if (prior_tv.tv_sec) {
elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC
+ (start_tv.tv_usec - prior_tv.tv_usec);
total_written -= (int64)elapsed_usec * bwlimit / (ONE_SEC/1024);
if (total_written < 0)
total_written = 0;
}
sleep_usec = total_written * (ONE_SEC/1024) / bwlimit;
if (sleep_usec < ONE_SEC / 10) {
prior_tv = start_tv;
return;
}
tv.tv_sec = sleep_usec / ONE_SEC;
tv.tv_usec = sleep_usec % ONE_SEC;
select(0, NULL, NULL, NULL, &tv);
gettimeofday(&prior_tv, NULL);
elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC
+ (prior_tv.tv_usec - start_tv.tv_usec);
total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024);
}
static const char *what_fd_is(int fd)
{
static char buf[20];
if (fd == sock_f_out)
return "socket";
else if (fd == msg_fd_out)
return "message fd";
else if (fd == batch_fd)
return "batch file";
else {
snprintf(buf, sizeof buf, "fd %d", fd);
return buf;
}
}
/* Write len bytes to the file descriptor fd, looping as necessary to get
* the job done and also (in certain circumstances) reading any data on
* msg_fd_in to avoid deadlock.
*
* This function underlies the multiplexing system. The body of the
* application never calls this function directly. */
static void writefd_unbuffered(int fd, const char *buf, size_t len)
{
size_t n, total = 0;
fd_set w_fds, r_fds, e_fds;
int maxfd, count, cnt, using_r_fds;
int defer_inc = 0;
struct timeval tv;
if (no_flush++)
defer_forwarding_messages++, defer_inc++;
while (total < len) {
FD_ZERO(&w_fds);
FD_SET(fd, &w_fds);
FD_ZERO(&e_fds);
FD_SET(fd, &e_fds);
maxfd = fd;
if (msg_fd_in >= 0) {
FD_ZERO(&r_fds);
FD_SET(msg_fd_in, &r_fds);
if (msg_fd_in > maxfd)
maxfd = msg_fd_in;
using_r_fds = 1;
} else
using_r_fds = 0;
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
errno = 0;
count = select(maxfd + 1, using_r_fds ? &r_fds : NULL,
&w_fds, &e_fds, &tv);
if (count <= 0) {
if (count < 0 && errno == EBADF)
exit_cleanup(RERR_SOCKETIO);
check_timeout();
continue;
}
/*if (FD_ISSET(fd, &e_fds))
rprintf(FINFO, "select exception on fd %d\n", fd); */
if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds))
read_msg_fd();
if (!FD_ISSET(fd, &w_fds))
continue;
n = len - total;
if (bwlimit_writemax && n > bwlimit_writemax)
n = bwlimit_writemax;
cnt = write(fd, buf + total, n);
if (cnt <= 0) {
if (cnt < 0) {
if (errno == EINTR)
continue;
if (errno == EWOULDBLOCK || errno == EAGAIN) {
msleep(1);
continue;
}
}
/* Don't try to write errors back across the stream. */
if (fd == sock_f_out)
io_end_multiplex_out();
/* Don't try to write errors down a failing msg pipe. */
if (am_server && fd == msg_fd_out)
exit_cleanup(RERR_STREAMIO);
rsyserr(FERROR, errno,
"writefd_unbuffered failed to write %ld bytes to %s [%s]",
(long)len, what_fd_is(fd), who_am_i());
/* If the other side is sending us error messages, try
* to grab any messages they sent before they died. */
while (!am_server && fd == sock_f_out && io_multiplexing_in) {
char buf[1024];
set_io_timeout(30);
ignore_timeout = 0;
readfd_unbuffered(sock_f_in, buf, sizeof buf);
}
exit_cleanup(RERR_STREAMIO);
}
total += cnt;
defer_forwarding_messages++, defer_inc++;
if (fd == sock_f_out) {
if (io_timeout || am_generator)
last_io_out = time(NULL);
sleep_for_bwlimit(cnt);
}
}
no_flush--;
if (keep_defer_forwarding)
defer_inc--;
if (!(defer_forwarding_messages -= defer_inc) && !no_flush)
msg_flush();
}
int io_flush(int flush_it_all)
{
int flushed_something = 0;
if (no_flush)
return 0;
if (iobuf_out_cnt) {
if (io_multiplexing_out)
mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt, 0);
else
writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt);
iobuf_out_cnt = 0;
flushed_something = 1;
}
if (flush_it_all && !defer_forwarding_messages && msg_queue.head) {
msg_flush();
flushed_something = 1;
}
return flushed_something;
}
static void writefd(int fd, const char *buf, size_t len)
{
if (fd == sock_f_out)
stats.total_written += len;
if (fd == write_batch_monitor_out)
writefd_unbuffered(batch_fd, buf, len);
if (!iobuf_out || fd != iobuf_f_out) {
writefd_unbuffered(fd, buf, len);
return;
}
while (len) {
int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt);
if (n > 0) {
memcpy(iobuf_out+iobuf_out_cnt, buf, n);
buf += n;
len -= n;
iobuf_out_cnt += n;
}
if (iobuf_out_cnt == IO_BUFFER_SIZE)
io_flush(NORMAL_FLUSH);
}
}
void write_shortint(int f, unsigned short x)
{
char b[2];
b[0] = (char)x;
b[1] = (char)(x >> 8);
writefd(f, b, 2);
}
void write_int(int f, int32 x)
{
char b[4];
SIVAL(b, 0, x);
writefd(f, b, 4);
}
void write_varint(int f, int32 x)
{
char b[5];
uchar bit;
int cnt = 4;
SIVAL(b, 1, x);
while (cnt > 1 && b[cnt] == 0)
cnt--;
bit = ((uchar)1<<(7-cnt+1));
if (CVAL(b, cnt) >= bit) {
cnt++;
*b = ~(bit-1);
} else if (cnt > 1)
*b = b[cnt] | ~(bit*2-1);
else
*b = b[cnt];
writefd(f, b, cnt);
}
void write_varlong(int f, int64 x, uchar min_bytes)
{
char b[9];
uchar bit;
int cnt = 8;
SIVAL(b, 1, x);
#if SIZEOF_INT64 >= 8
SIVAL(b, 5, x >> 32);
#else
if (x <= 0x7FFFFFFF && x >= 0)
memset(b + 5, 0, 4);
else {
rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
exit_cleanup(RERR_UNSUPPORTED);
}
#endif
while (cnt > min_bytes && b[cnt] == 0)
cnt--;
bit = ((uchar)1<<(7-cnt+min_bytes));
if (CVAL(b, cnt) >= bit) {
cnt++;
*b = ~(bit-1);
} else if (cnt > min_bytes)
*b = b[cnt] | ~(bit*2-1);
else
*b = b[cnt];
writefd(f, b, cnt);
}
/*
* Note: int64 may actually be a 32-bit type if ./configure couldn't find any
* 64-bit types on this platform.
*/
void write_longint(int f, int64 x)
{
char b[12], * const s = b+4;
SIVAL(s, 0, x);
if (x <= 0x7FFFFFFF && x >= 0) {
writefd(f, s, 4);
return;
}
#if SIZEOF_INT64 < 8
rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
exit_cleanup(RERR_UNSUPPORTED);
#else
memset(b, 0xFF, 4);
SIVAL(s, 4, x >> 32);
writefd(f, b, 12);
#endif
}
void write_buf(int f, const char *buf, size_t len)
{
writefd(f,buf,len);
}
/** Write a string to the connection */
void write_sbuf(int f, const char *buf)
{
writefd(f, buf, strlen(buf));
}
void write_byte(int f, uchar c)
{
writefd(f, (char *)&c, 1);
}
void write_vstring(int f, const char *str, int len)
{
uchar lenbuf[3], *lb = lenbuf;
if (len > 0x7F) {
if (len > 0x7FFF) {
rprintf(FERROR,
"attempting to send over-long vstring (%d > %d)\n",
len, 0x7FFF);
exit_cleanup(RERR_PROTOCOL);
}
*lb++ = len / 0x100 + 0x80;
}
*lb = len;
writefd(f, (char*)lenbuf, lb - lenbuf + 1);
if (len)
writefd(f, str, len);
}
/* Send a file-list index using a byte-reduction method. */
void write_ndx(int f, int32 ndx)
{
static int32 prev_positive = -1, prev_negative = 1;
int32 diff, cnt = 0;
char b[6];
if (protocol_version < 30 || read_batch) {
write_int(f, ndx);
return;
}
/* Send NDX_DONE as a single-byte 0 with no side effects. Send
* negative nums as a positive after sending a leading 0xFF. */
if (ndx >= 0) {
diff = ndx - prev_positive;
prev_positive = ndx;
} else if (ndx == NDX_DONE) {
*b = 0;
writefd(f, b, 1);
return;
} else {
b[cnt++] = (char)0xFF;
ndx = -ndx;
diff = ndx - prev_negative;
prev_negative = ndx;
}
/* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767
* or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE
* & all 4 bytes of the (non-negative) num with the high-bit set. */
if (diff < 0xFE && diff > 0)
b[cnt++] = (char)diff;
else if (diff < 0 || diff > 0x7FFF) {
b[cnt++] = (char)0xFE;
b[cnt++] = (char)((ndx >> 24) | 0x80);
b[cnt++] = (char)ndx;
b[cnt++] = (char)(ndx >> 8);
b[cnt++] = (char)(ndx >> 16);
} else {
b[cnt++] = (char)0xFE;
b[cnt++] = (char)(diff >> 8);
b[cnt++] = (char)diff;
}
writefd(f, b, cnt);
}
/* Receive a file-list index using a byte-reduction method. */
int32 read_ndx(int f)
{
static int32 prev_positive = -1, prev_negative = 1;
int32 *prev_ptr, num;
char b[4];
if (protocol_version < 30)
return read_int(f);
readfd(f, b, 1);
if (CVAL(b, 0) == 0xFF) {
readfd(f, b, 1);
prev_ptr = &prev_negative;
} else if (CVAL(b, 0) == 0)
return NDX_DONE;
else
prev_ptr = &prev_positive;
if (CVAL(b, 0) == 0xFE) {
readfd(f, b, 2);
if (CVAL(b, 0) & 0x80) {
b[3] = CVAL(b, 0) & ~0x80;
b[0] = b[1];
readfd(f, b+1, 2);
num = IVAL(b, 0);
} else
num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr;
} else
num = UVAL(b, 0) + *prev_ptr;
*prev_ptr = num;
if (prev_ptr == &prev_negative)
num = -num;
return num;
}
/* Read a line of up to bufsiz-1 characters into buf. Strips
* the (required) trailing newline and all carriage returns.
* Returns 1 for success; 0 for I/O error or truncation. */
int read_line_old(int f, char *buf, size_t bufsiz)
{
bufsiz--; /* leave room for the null */
while (bufsiz > 0) {
buf[0] = 0;
read_buf(f, buf, 1);
if (buf[0] == 0)
return 0;
if (buf[0] == '\n')
break;
if (buf[0] != '\r') {
buf++;
bufsiz--;
}
}
*buf = '\0';
return bufsiz > 0;
}
void io_printf(int fd, const char *format, ...)
{
va_list ap;
char buf[BIGPATHBUFLEN];
int len;
va_start(ap, format);
len = vsnprintf(buf, sizeof buf, format, ap);
va_end(ap);
if (len < 0)
exit_cleanup(RERR_STREAMIO);
if (len > (int)sizeof buf) {
rprintf(FERROR, "io_printf() was too long for the buffer.\n");
exit_cleanup(RERR_STREAMIO);
}
write_sbuf(fd, buf);
}
/** Setup for multiplexing a MSG_* stream with the data stream. */
void io_start_multiplex_out(void)
{
io_flush(NORMAL_FLUSH);
io_start_buffering_out(sock_f_out);
io_multiplexing_out = 1;
}
/** Setup for multiplexing a MSG_* stream with the data stream. */
void io_start_multiplex_in(void)
{
io_flush(NORMAL_FLUSH);
io_start_buffering_in(sock_f_in);
io_multiplexing_in = 1;
}
/** Write an message to the multiplexed data stream. */
int io_multiplex_write(enum msgcode code, const char *buf, size_t len, int convert)
{
if (!io_multiplexing_out)
return 0;
io_flush(NORMAL_FLUSH);
stats.total_written += (len+4);
mplex_write(sock_f_out, code, buf, len, convert);
return 1;
}
void io_end_multiplex_in(void)
{
io_multiplexing_in = 0;
io_end_buffering_in();
}
/** Stop output multiplexing. */
void io_end_multiplex_out(void)
{
io_multiplexing_out = 0;
io_end_buffering_out();
}
void start_write_batch(int fd)
{
/* Some communication has already taken place, but we don't
* enable batch writing until here so that we can write a
* canonical record of the communication even though the
* actual communication so far depends on whether a daemon
* is involved. */
write_int(batch_fd, protocol_version);
if (protocol_version >= 30)
write_byte(batch_fd, compat_flags);
write_int(batch_fd, checksum_seed);
if (am_sender)
write_batch_monitor_out = fd;
else
write_batch_monitor_in = fd;
}
void stop_write_batch(void)
{
write_batch_monitor_out = -1;
write_batch_monitor_in = -1;
}
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