/** If no timeout is specified then use a 60 second select timeout */
#define SELECT_TIMEOUT 60
-static int io_multiplexing_out;
-static int io_multiplexing_in;
-static int multiplex_in_fd = -1;
-static int multiplex_out_fd = -1;
-static time_t last_io;
-static int no_flush;
-
extern int bwlimit;
extern size_t bwlimit_writemax;
extern int verbose;
extern int am_server;
extern int am_daemon;
extern int am_sender;
+extern int am_generator;
extern int eol_nulls;
+extern int csum_length;
+extern int checksum_seed;
+extern int protocol_version;
extern char *remote_filesfrom_file;
extern struct stats stats;
const char phase_unknown[] = "unknown";
int select_timeout = SELECT_TIMEOUT;
+int batch_fd = -1;
+int batch_gen_fd = -1;
/**
* The connection might be dropped at some point; perhaps because the
int msg_fd_in = -1;
int msg_fd_out = -1;
+static int io_multiplexing_out;
+static int io_multiplexing_in;
+static int sock_f_in = -1;
+static int sock_f_out = -1;
+static time_t last_io;
+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 char io_filesfrom_buf[2048];
t = time(NULL);
- if (last_io && io_timeout && (t-last_io) >= io_timeout) {
+ if (t - last_io >= io_timeout) {
if (!am_server && !am_daemon) {
- rprintf(FERROR, "io timeout after %d seconds - exiting\n",
+ rprintf(FERROR, "io timeout after %d seconds -- exiting\n",
(int)(t-last_io));
}
exit_cleanup(RERR_TIMEOUT);
}
}
-/** Setup the fd used to receive MSG_* messages. Only needed when
- * we're the generator because the sender and receiver both use the
- * multiplexed I/O setup. */
+/* 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;
+}
+
+/* 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 because the generator and the sender both use
- * the multiplexed I/O setup. */
+/* 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;
msg_list_push(NORMAL_FLUSH);
}
-/** Read a message from the MSG_* fd and dispatch it. This is only
- * called by the generator. */
+/* 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];
int fd = msg_fd_in;
int tag, len;
- /* Temporarily disable msg_fd_in. This is needed because we
- * may call a write routine that could try to call us back. */
+ /* Temporarily disable msg_fd_in. This is needed to avoid looping back
+ * to this routine from read_timeout() and writefd_unbuffered(). */
msg_fd_in = -1;
read_loop(fd, buf, 4);
switch (tag) {
case MSG_DONE:
- if (len != 0) {
+ if (len != 0 || !am_generator) {
rprintf(FERROR, "invalid message %d:%d\n", tag, len);
exit_cleanup(RERR_STREAMIO);
}
redo_list_add(-1);
break;
case MSG_REDO:
- if (len != 4) {
+ if (len != 4 || !am_generator) {
rprintf(FERROR, "invalid message %d:%d\n", tag, len);
exit_cleanup(RERR_STREAMIO);
}
* program where that is a problem (start_socket_client),
* kludge_around_eof is True and we just exit.
*/
-static void whine_about_eof(void)
+static void whine_about_eof(int fd)
{
- if (kludge_around_eof)
+ if (kludge_around_eof && fd == sock_f_in)
exit_cleanup(0);
- else {
- rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
- "(%.0f bytes read so far)\n",
- (double)stats.total_read);
-
- exit_cleanup(RERR_STREAMIO);
- }
-}
+ rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
+ "(%.0f bytes received so far) [%s]\n",
+ (double)stats.total_read, who_am_i());
-static void die_from_readerr(int err)
-{
- /* this prevents us trying to write errors on a dead socket */
- io_multiplexing_close();
-
- rsyserr(FERROR, err, "read error");
exit_cleanup(RERR_STREAMIO);
}
/* until we manage to read *something* */
fd_set r_fds, w_fds;
struct timeval tv;
- int fd_count = fd+1;
+ int maxfd = fd;
int count;
FD_ZERO(&r_fds);
+ FD_ZERO(&w_fds);
FD_SET(fd, &r_fds);
if (msg_fd_in >= 0) {
FD_SET(msg_fd_in, &r_fds);
- if (msg_fd_in >= fd_count)
- fd_count = msg_fd_in+1;
+ if (msg_fd_in > maxfd)
+ maxfd = msg_fd_in;
} else if (msg_list_head) {
FD_SET(msg_fd_out, &w_fds);
- if (msg_fd_out >= fd_count)
- fd_count = msg_fd_out+1;
+ if (msg_fd_out > maxfd)
+ maxfd = msg_fd_out;
}
if (io_filesfrom_f_out >= 0) {
int new_fd;
new_fd = -1;
}
} else {
- FD_ZERO(&w_fds);
FD_SET(io_filesfrom_f_out, &w_fds);
new_fd = io_filesfrom_f_out;
}
- if (new_fd >= fd_count)
- fd_count = new_fd+1;
+ if (new_fd > maxfd)
+ maxfd = new_fd;
}
tv.tv_sec = select_timeout;
errno = 0;
- count = select(fd_count, &r_fds,
- io_filesfrom_buflen? &w_fds : NULL,
- NULL, &tv);
+ count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
if (count <= 0) {
- check_timeout();
if (errno == EBADF)
exit_cleanup(RERR_SOCKETIO);
+ check_timeout();
continue;
}
n = read(fd, buf, len);
- if (n > 0) {
- buf += n;
- len -= n;
- ret += n;
- if (io_timeout)
- last_io = time(NULL);
- continue;
- } else if (n == 0) {
- whine_about_eof();
- return -1; /* doesn't return */
- } else if (n < 0) {
+ if (n <= 0) {
+ if (n == 0)
+ whine_about_eof(fd); /* Doesn't return. */
if (errno == EINTR || errno == EWOULDBLOCK
|| errno == EAGAIN)
continue;
- die_from_readerr(errno);
+
+ /* Don't write errors on a dead socket. */
+ if (fd == sock_f_in)
+ close_multiplexing_out();
+ rsyserr(FERROR, errno, "read error");
+ exit_cleanup(RERR_STREAMIO);
}
+
+ buf += n;
+ len -= n;
+ ret += n;
+
+ if (io_timeout && fd == sock_f_in)
+ last_io = time(NULL);
}
return ret;
}
+static char *iobuf_out;
+static int iobuf_out_cnt;
+
+void io_start_buffering_out(void)
+{
+ if (iobuf_out)
+ return;
+ if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE)))
+ out_of_memory("io_start_buffering_out");
+ iobuf_out_cnt = 0;
+}
+
+
+static char *iobuf_in;
+static size_t iobuf_in_siz;
+
+void io_start_buffering_in(void)
+{
+ if (iobuf_in)
+ return;
+ iobuf_in_siz = 2 * IO_BUFFER_SIZE;
+ if (!(iobuf_in = new_array(char, iobuf_in_siz)))
+ out_of_memory("io_start_buffering_in");
+}
+
+
+void io_end_buffering(void)
+{
+ io_flush(NORMAL_FLUSH);
+ if (!io_multiplexing_out) {
+ free(iobuf_out);
+ iobuf_out = NULL;
+ }
+}
+
+
/**
* Continue trying to read len bytes - don't return until len has been
* read.
*
* Never returns <= 0.
*/
-static int read_unbuffered(int fd, char *buf, size_t len)
+static int readfd_unbuffered(int fd, char *buf, size_t len)
{
static size_t remaining;
+ static size_t iobuf_in_ndx;
int tag, ret = 0;
char line[1024];
- static char *buffer;
- static size_t bufferIdx = 0;
- static size_t bufferSz;
- if (fd != multiplex_in_fd)
+ if (!iobuf_in || fd != sock_f_in)
return read_timeout(fd, buf, len);
if (!io_multiplexing_in && remaining == 0) {
- if (!buffer) {
- bufferSz = 2 * IO_BUFFER_SIZE;
- buffer = new_array(char, bufferSz);
- if (!buffer)
- out_of_memory("read_unbuffered");
- }
- remaining = read_timeout(fd, buffer, bufferSz);
- bufferIdx = 0;
+ remaining = read_timeout(fd, iobuf_in, iobuf_in_siz);
+ iobuf_in_ndx = 0;
}
while (ret == 0) {
if (remaining) {
len = MIN(len, remaining);
- memcpy(buf, buffer + bufferIdx, len);
- bufferIdx += len;
+ memcpy(buf, iobuf_in + iobuf_in_ndx, len);
+ iobuf_in_ndx += len;
remaining -= len;
ret = len;
break;
switch (tag) {
case MSG_DATA:
- if (!buffer || remaining > bufferSz) {
- buffer = realloc_array(buffer, char, remaining);
- if (!buffer)
- out_of_memory("read_unbuffered");
- bufferSz = remaining;
+ if (remaining > iobuf_in_siz) {
+ if (!(iobuf_in = realloc_array(iobuf_in, char,
+ remaining)))
+ out_of_memory("readfd_unbuffered");
+ iobuf_in_siz = remaining;
}
- read_loop(fd, buffer, remaining);
- bufferIdx = 0;
+ read_loop(fd, iobuf_in, remaining);
+ iobuf_in_ndx = 0;
break;
case MSG_INFO:
case MSG_ERROR:
if (remaining >= sizeof line) {
- rprintf(FERROR, "multiplexing overflow %d:%ld\n\n",
- tag, (long)remaining);
+ rprintf(FERROR,
+ "[%s] multiplexing overflow %d:%ld\n\n",
+ who_am_i(), tag, (long)remaining);
exit_cleanup(RERR_STREAMIO);
}
read_loop(fd, line, remaining);
remaining = 0;
break;
default:
- rprintf(FERROR, "unexpected tag %d\n", tag);
+ rprintf(FERROR, "[%s] unexpected tag %d\n",
+ who_am_i(), tag);
exit_cleanup(RERR_STREAMIO);
}
}
size_t total = 0;
while (total < N) {
- ret = read_unbuffered(fd, buffer + total, N-total);
+ ret = readfd_unbuffered(fd, buffer + total, N-total);
total += ret;
}
- stats.total_read += total;
+ if (fd == write_batch_monitor_in) {
+ if ((size_t)write(batch_fd, buffer, total) != total)
+ exit_cleanup(RERR_FILEIO);
+ }
+
+ if (fd == sock_f_in)
+ stats.total_read += total;
}
if ((int32)ret != (int32)0xffffffff)
return ret;
-#ifdef NO_INT64
- rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
+#if SIZEOF_INT64 < 8
+ rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
exit_cleanup(RERR_UNSUPPORTED);
#else
readfd(f,b,8);
void read_sbuf(int f,char *buf,size_t len)
{
- read_buf(f,buf,len);
+ readfd(f, buf, len);
buf[len] = 0;
}
unsigned char read_byte(int f)
{
unsigned char c;
- read_buf(f, (char *)&c, 1);
+ readfd(f, (char *)&c, 1);
return c;
}
+/* 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)
+{
+ sum->count = read_int(f);
+ sum->blength = read_int(f);
+ if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) {
+ rprintf(FERROR, "[%s] Invalid block length %ld\n",
+ who_am_i(), (long)sum->blength);
+ exit_cleanup(RERR_PROTOCOL);
+ }
+ sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f);
+ if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) {
+ rprintf(FERROR, "[%s] Invalid checksum length %d\n",
+ who_am_i(), sum->s2length);
+ exit_cleanup(RERR_PROTOCOL);
+ }
+ sum->remainder = read_int(f);
+ if (sum->remainder < 0 || sum->remainder > sum->blength) {
+ rprintf(FERROR, "[%s] Invalid remainder length %ld\n",
+ who_am_i(), (long)sum->remainder);
+ 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.
}
-/**
- * Write len bytes to the file descriptor @p fd.
+/* Write len bytes to the file descriptor fd, looping as necessary to get
+ * the job done and also (in the generator) 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.
- **/
+ * application never calls this function directly. */
static void writefd_unbuffered(int fd,char *buf,size_t len)
{
- size_t total = 0;
+ size_t n, total = 0;
fd_set w_fds, r_fds;
- int fd_count, count;
+ int maxfd, count, ret;
struct timeval tv;
- if (fd == msg_fd_out) {
- rprintf(FERROR, "Internal error: wrong write used in receiver.\n");
- exit_cleanup(RERR_PROTOCOL);
- }
-
no_flush++;
while (total < len) {
FD_ZERO(&w_fds);
FD_SET(fd,&w_fds);
- fd_count = fd;
+ maxfd = fd;
if (msg_fd_in >= 0) {
FD_ZERO(&r_fds);
FD_SET(msg_fd_in,&r_fds);
- if (msg_fd_in > fd_count)
- fd_count = msg_fd_in;
+ if (msg_fd_in > maxfd)
+ maxfd = msg_fd_in;
+ }
+ if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) {
+ FD_SET(sock_f_out, &w_fds);
+ if (sock_f_out > maxfd)
+ maxfd = sock_f_out;
}
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
errno = 0;
- count = select(fd_count+1, msg_fd_in >= 0 ? &r_fds : NULL,
+ count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL,
&w_fds, NULL, &tv);
if (count <= 0) {
- check_timeout();
- if (errno == EBADF)
+ if (count < 0 && errno == EBADF)
exit_cleanup(RERR_SOCKETIO);
+ check_timeout();
continue;
}
if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds))
read_msg_fd();
- if (FD_ISSET(fd, &w_fds)) {
- int ret;
- size_t n = len-total;
- if (bwlimit && n > bwlimit_writemax)
- n = bwlimit_writemax;
- ret = write(fd,buf+total,n);
+ if (!FD_ISSET(fd, &w_fds)) {
+ if (fd != sock_f_out && iobuf_out_cnt) {
+ no_flush--;
+ io_flush(NORMAL_FLUSH);
+ no_flush++;
+ }
+ continue;
+ }
+
+ n = len - total;
+ if (bwlimit && n > bwlimit_writemax)
+ n = bwlimit_writemax;
+ ret = write(fd, buf + total, n);
+ if (ret <= 0) {
if (ret < 0) {
if (errno == EINTR)
continue;
}
}
- if (ret <= 0) {
- /* Don't try to write errors back
- * across the stream */
- io_multiplexing_close();
- rsyserr(FERROR, errno,
- "writefd_unbuffered failed to write %ld bytes: phase \"%s\"",
- (long)len, io_write_phase);
- exit_cleanup(RERR_STREAMIO);
+ /* Don't try to write errors back across the stream. */
+ if (fd == sock_f_out)
+ close_multiplexing_out();
+ rsyserr(FERROR, errno,
+ "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]",
+ (long)len, io_write_phase, who_am_i());
+ /* If the other side is sending us error messages, try
+ * to grab any messages they sent before they died. */
+ while (fd == sock_f_out && io_multiplexing_in) {
+ io_timeout = select_timeout = 30;
+ readfd_unbuffered(sock_f_in, io_filesfrom_buf,
+ sizeof io_filesfrom_buf);
}
+ exit_cleanup(RERR_STREAMIO);
+ }
- sleep_for_bwlimit(ret);
-
- total += ret;
+ total += ret;
+ if (fd == sock_f_out) {
if (io_timeout)
last_io = time(NULL);
+ sleep_for_bwlimit(ret);
}
}
}
-static char *io_buffer;
-static int io_buffer_count;
-
-void io_start_buffering_out(int fd)
-{
- if (io_buffer)
- return;
- multiplex_out_fd = fd;
- io_buffer = new_array(char, IO_BUFFER_SIZE);
- if (!io_buffer)
- out_of_memory("writefd");
- io_buffer_count = 0;
-}
-
-void io_start_buffering_in(int fd)
-{
- multiplex_in_fd = fd;
-}
-
/**
* Write an message to a multiplexed stream. If this fails then rsync
* exits.
**/
-static void mplex_write(int fd, enum msgcode code, char *buf, size_t len)
+static void mplex_write(enum msgcode code, char *buf, size_t len)
{
char buffer[4096];
size_t n = len;
SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
- if (n > (sizeof buffer - 4)) {
+ if (n > sizeof buffer - 4)
n = sizeof buffer - 4;
- }
memcpy(&buffer[4], buf, n);
- writefd_unbuffered(fd, buffer, n+4);
+ writefd_unbuffered(sock_f_out, buffer, n+4);
len -= n;
buf += n;
- if (len) {
- writefd_unbuffered(fd, buf, len);
- }
+ if (len)
+ writefd_unbuffered(sock_f_out, buf, len);
}
void io_flush(int flush_it_all)
{
- int fd = multiplex_out_fd;
-
msg_list_push(flush_it_all);
- if (!io_buffer_count || no_flush)
+ if (!iobuf_out_cnt || no_flush)
return;
if (io_multiplexing_out)
- mplex_write(fd, MSG_DATA, io_buffer, io_buffer_count);
+ mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt);
else
- writefd_unbuffered(fd, io_buffer, io_buffer_count);
- io_buffer_count = 0;
+ writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt);
+ iobuf_out_cnt = 0;
}
-void io_end_buffering(void)
-{
- io_flush(NORMAL_FLUSH);
- if (!io_multiplexing_out) {
- free(io_buffer);
- io_buffer = NULL;
- }
-}
-
static void writefd(int fd,char *buf,size_t len)
{
- stats.total_written += len;
-
if (fd == msg_fd_out) {
rprintf(FERROR, "Internal error: wrong write used in receiver.\n");
exit_cleanup(RERR_PROTOCOL);
}
- if (!io_buffer || fd != multiplex_out_fd) {
+ if (fd == sock_f_out)
+ stats.total_written += len;
+
+ if (fd == write_batch_monitor_out) {
+ if ((size_t)write(batch_fd, buf, len) != len)
+ exit_cleanup(RERR_FILEIO);
+ }
+
+ if (!iobuf_out || fd != sock_f_out) {
writefd_unbuffered(fd, buf, len);
return;
}
while (len) {
- int n = MIN((int)len, IO_BUFFER_SIZE-io_buffer_count);
+ int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt);
if (n > 0) {
- memcpy(io_buffer+io_buffer_count, buf, n);
+ memcpy(iobuf_out+iobuf_out_cnt, buf, n);
buf += n;
len -= n;
- io_buffer_count += n;
+ iobuf_out_cnt += n;
}
- if (io_buffer_count == IO_BUFFER_SIZE)
+ if (iobuf_out_cnt == IO_BUFFER_SIZE)
io_flush(NORMAL_FLUSH);
}
}
return;
}
-#ifdef NO_INT64
- rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
+#if SIZEOF_INT64 < 8
+ rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
exit_cleanup(RERR_UNSUPPORTED);
#else
write_int(f, (int32)0xFFFFFFFF);
}
/** Write a string to the connection */
-static void write_sbuf(int f,char *buf)
+void write_sbuf(int f, char *buf)
{
- write_buf(f, buf, strlen(buf));
+ writefd(f, buf, strlen(buf));
}
-
void write_byte(int f,unsigned char c)
{
- write_buf(f,(char *)&c,1);
+ writefd(f, (char *)&c, 1);
}
/** Setup for multiplexing a MSG_* stream with the data stream. */
-void io_start_multiplex_out(int fd)
+void io_start_multiplex_out(void)
{
- multiplex_out_fd = fd;
io_flush(NORMAL_FLUSH);
- io_start_buffering_out(fd);
+ io_start_buffering_out();
io_multiplexing_out = 1;
}
/** Setup for multiplexing a MSG_* stream with the data stream. */
-void io_start_multiplex_in(int fd)
+void io_start_multiplex_in(void)
{
- multiplex_in_fd = fd;
io_flush(NORMAL_FLUSH);
+ io_start_buffering_in();
io_multiplexing_in = 1;
}
io_flush(NORMAL_FLUSH);
stats.total_written += (len+4);
- mplex_write(multiplex_out_fd, code, buf, len);
+ mplex_write(code, buf, len);
return 1;
}
+void close_multiplexing_in(void)
+{
+ io_multiplexing_in = 0;
+}
+
/** Stop output multiplexing. */
-void io_multiplexing_close(void)
+void close_multiplexing_out(void)
{
io_multiplexing_out = 0;
}
+void start_write_batch(int fd)
+{
+ write_stream_flags(batch_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);
+ 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;
+}
git.samba.org / rsync.git / blobdiff