/* -*- c-file-style: "linux" -*-
- *
- * Copyright (C) 1996-2001 by Andrew Tridgell
+ *
+ * Copyright (C) 1996-2001 by Andrew Tridgell
* Copyright (C) Paul Mackerras 1996
* Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
- *
+ *
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
/**
* @file io.c
*
- * Socket and pipe IO utilities used in rsync.
+ * Socket and pipe I/O utilities used in rsync.
*
* rsync provides its own multiplexing system, which is used to send
* stderr and stdout over a single socket. We need this because
/** 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 io_timeout;
+extern int allowed_lull;
+extern int am_server;
+extern int am_daemon;
+extern int am_sender;
+extern int am_generator;
+extern int eol_nulls;
+extern int read_batch;
+extern int csum_length;
+extern int checksum_seed;
+extern int protocol_version;
+extern int remove_sent_files;
+extern int preserve_hard_links;
+extern char *filesfrom_host;
extern struct stats stats;
-
+extern struct file_list *the_file_list;
const char phase_unknown[] = "unknown";
+int ignore_timeout = 0;
+int batch_fd = -1;
+int batch_gen_fd = -1;
/**
* The connection might be dropped at some point; perhaps because the
* not very helpful. So instead we try to make io_phase_name point to
* something useful.
*
- * For buffered/multiplexed IO these names will be somewhat
+ * For buffered/multiplexed I/O these names will be somewhat
* approximate; perhaps for ease of support we would rather make the
- * buffer always flush when a single application-level IO finishes.
+ * buffer always flush when a single application-level I/O finishes.
*
* @todo Perhaps we want some simple stack functionality, but there's
* no need to overdo it.
const char *io_write_phase = phase_unknown;
const char *io_read_phase = phase_unknown;
-/** Ignore EOF errors while reading a module listing if the remote
- version is 24 or less. */
-int kludge_around_eof = False;
+/* 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 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_error_fd = -1;
static int io_filesfrom_f_in = -1;
static int io_filesfrom_f_out = -1;
static char io_filesfrom_buf[2048];
static char *io_filesfrom_bp;
static char io_filesfrom_lastchar;
static int io_filesfrom_buflen;
+static size_t contiguous_write_len = 0;
+static int select_timeout = SELECT_TIMEOUT;
static void read_loop(int fd, char *buf, size_t len);
+struct flist_ndx_item {
+ struct flist_ndx_item *next;
+ int ndx;
+};
+
+struct flist_ndx_list {
+ struct flist_ndx_item *head, *tail;
+};
+
+static struct flist_ndx_list redo_list, hlink_list;
+
+struct msg_list {
+ struct msg_list *next;
+ char *buf;
+ int len;
+};
+
+static struct msg_list *msg_list_head;
+static struct msg_list *msg_list_tail;
+
+static void flist_ndx_push(struct flist_ndx_list *lp, int ndx)
+{
+ struct flist_ndx_item *item;
+
+ if (!(item = new(struct flist_ndx_item)))
+ out_of_memory("flist_ndx_push");
+ item->next = NULL;
+ item->ndx = ndx;
+ if (lp->tail)
+ lp->tail->next = item;
+ else
+ lp->head = item;
+ lp->tail = item;
+}
+
+static int flist_ndx_pop(struct flist_ndx_list *lp)
+{
+ struct flist_ndx_item *next;
+ int ndx;
+
+ if (!lp->head)
+ return -1;
+
+ ndx = lp->head->ndx;
+ next = lp->head->next;
+ free(lp->head);
+ lp->head = next;
+ if (!next)
+ lp->tail = NULL;
+
+ return ndx;
+}
+
static void check_timeout(void)
{
- extern int am_server, am_daemon;
time_t t;
- err_list_push();
-
- if (!io_timeout) return;
+ if (!io_timeout || ignore_timeout)
+ return;
- if (!last_io) {
- last_io = time(NULL);
+ if (!last_io_in) {
+ last_io_in = time(NULL);
return;
}
t = time(NULL);
- if (last_io && io_timeout && (t-last_io) >= io_timeout) {
+ if (t - last_io_in >= io_timeout) {
if (!am_server && !am_daemon) {
- rprintf(FERROR,"io timeout after %d seconds - exiting\n",
- (int)(t-last_io));
+ rprintf(FERROR, "io timeout after %d seconds -- exiting\n",
+ (int)(t-last_io_in));
}
exit_cleanup(RERR_TIMEOUT);
}
}
-/** Setup the fd used to propagate errors */
-void io_set_error_fd(int fd)
+/* 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;
+
+ if (!io_timeout || io_timeout > SELECT_TIMEOUT)
+ select_timeout = SELECT_TIMEOUT;
+ else
+ select_timeout = io_timeout;
+
+ allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
+}
+
+/* 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)
{
- io_error_fd = fd;
+ msg_fd_out = fd;
+ set_nonblocking(msg_fd_out);
+}
+
+/* Add a message to the pending MSG_* list. */
+static void msg_list_add(int code, char *buf, int len)
+{
+ struct msg_list *ml;
+
+ if (!(ml = new(struct msg_list)))
+ out_of_memory("msg_list_add");
+ ml->next = NULL;
+ if (!(ml->buf = new_array(char, len+4)))
+ out_of_memory("msg_list_add");
+ SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len);
+ memcpy(ml->buf+4, buf, len);
+ ml->len = len+4;
+ if (msg_list_tail)
+ msg_list_tail->next = ml;
+ else
+ msg_list_head = ml;
+ msg_list_tail = ml;
+}
+
+void send_msg(enum msgcode code, char *buf, int len)
+{
+ if (msg_fd_out < 0) {
+ io_multiplex_write(code, buf, len);
+ return;
+ }
+ msg_list_add(code, buf, len);
+ msg_list_push(NORMAL_FLUSH);
}
-/** Read some data from the error fd and write it to the write log code */
-static void read_error_fd(void)
+/* 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[200];
+ char buf[2048];
size_t n;
- int fd = io_error_fd;
+ int fd = msg_fd_in;
int tag, len;
- /* io_error_fd is temporarily disabled -- is this meant to
- * prevent indefinite recursion? */
- io_error_fd = -1;
+ /* Temporarily disable msg_fd_in. This is needed to avoid looping back
+ * to this routine from writefd_unbuffered(). */
+ msg_fd_in = -1;
read_loop(fd, buf, 4);
tag = IVAL(buf, 0);
len = tag & 0xFFFFFF;
- tag = tag >> 24;
- tag -= MPLEX_BASE;
+ tag = (tag >> 24) - MPLEX_BASE;
- while (len) {
- n = len;
- if (n > (sizeof buf - 1))
- n = sizeof buf - 1;
- read_loop(fd, buf, n);
- rwrite((enum logcode)tag, buf, n);
- len -= n;
+ switch (tag) {
+ case MSG_DONE:
+ if (len != 0 || !am_generator) {
+ rprintf(FERROR, "invalid message %d:%d\n", tag, len);
+ exit_cleanup(RERR_STREAMIO);
+ }
+ flist_ndx_push(&redo_list, -1);
+ break;
+ case MSG_REDO:
+ if (len != 4 || !am_generator) {
+ rprintf(FERROR, "invalid message %d:%d\n", tag, len);
+ exit_cleanup(RERR_STREAMIO);
+ }
+ read_loop(fd, buf, 4);
+ flist_ndx_push(&redo_list, IVAL(buf,0));
+ break;
+ case MSG_DELETED:
+ if (len >= (int)sizeof buf || !am_generator) {
+ rprintf(FERROR, "invalid message %d:%d\n", tag, len);
+ exit_cleanup(RERR_STREAMIO);
+ }
+ read_loop(fd, buf, len);
+ io_multiplex_write(MSG_DELETED, buf, len);
+ break;
+ case MSG_SUCCESS:
+ if (len != 4 || !am_generator) {
+ rprintf(FERROR, "invalid message %d:%d\n", tag, len);
+ exit_cleanup(RERR_STREAMIO);
+ }
+ read_loop(fd, buf, len);
+ if (remove_sent_files)
+ io_multiplex_write(MSG_SUCCESS, buf, len);
+ if (preserve_hard_links)
+ flist_ndx_push(&hlink_list, IVAL(buf,0));
+ break;
+ case MSG_INFO:
+ case MSG_ERROR:
+ case MSG_LOG:
+ while (len) {
+ n = len;
+ if (n >= sizeof buf)
+ n = sizeof buf - 1;
+ read_loop(fd, buf, n);
+ rwrite((enum logcode)tag, buf, n);
+ len -= n;
+ }
+ break;
+ default:
+ rprintf(FERROR, "unknown message %d:%d\n", tag, len);
+ exit_cleanup(RERR_STREAMIO);
+ }
+
+ msg_fd_in = fd;
+}
+
+/* Try to push messages off the list onto the wire. If we leave with more
+ * to do, return 0. On error, return -1. If everything flushed, return 1.
+ * This is only active in the receiver. */
+int msg_list_push(int flush_it_all)
+{
+ static int written = 0;
+ struct timeval tv;
+ fd_set fds;
+
+ if (msg_fd_out < 0)
+ return -1;
+
+ while (msg_list_head) {
+ struct msg_list *ml = msg_list_head;
+ int n = write(msg_fd_out, ml->buf + written, ml->len - written);
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ if (errno != EWOULDBLOCK && errno != EAGAIN)
+ return -1;
+ if (!flush_it_all)
+ return 0;
+ FD_ZERO(&fds);
+ FD_SET(msg_fd_out, &fds);
+ tv.tv_sec = select_timeout;
+ tv.tv_usec = 0;
+ if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv))
+ check_timeout();
+ } else if ((written += n) == ml->len) {
+ free(ml->buf);
+ msg_list_head = ml->next;
+ if (!msg_list_head)
+ msg_list_tail = NULL;
+ free(ml);
+ written = 0;
+ }
+ }
+ return 1;
+}
+
+int get_redo_num(int itemizing, enum logcode code)
+{
+ while (1) {
+ if (hlink_list.head)
+ check_for_finished_hlinks(itemizing, code);
+ if (redo_list.head)
+ break;
+ read_msg_fd();
}
- io_error_fd = fd;
+ return flist_ndx_pop(&redo_list);
+}
+
+int get_hlink_num(void)
+{
+ return flist_ndx_pop(&hlink_list);
}
/**
io_filesfrom_buflen = 0;
}
-/**
- * It's almost always an error to get an EOF when we're trying to read
- * from the network, because the protocol is self-terminating.
+/* 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.
*
- * However, there is one unfortunate cases where it is not, which is
- * rsync <2.4.6 sending a list of modules on a server, since the list
- * is terminated by closing the socket. So, for the section of the
- * program where that is a problem (start_socket_client),
- * kludge_around_eof is True and we just exit.
- */
-static void whine_about_eof(void)
+ * 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 (kludge_around_eof)
- exit_cleanup(0);
- else {
- rprintf(FERROR,
- "%s: connection unexpectedly closed "
- "(%.0f bytes read so far)\n",
- RSYNC_NAME, (double)stats.total_read);
-
- exit_cleanup(RERR_STREAMIO);
+ 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);
}
-}
-
-static void die_from_readerr(int err)
-{
- /* this prevents us trying to write errors on a dead socket */
- io_multiplexing_close();
+ rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
+ "(%.0f bytes received so far) [%s]\n",
+ (double)stats.total_read, who_am_i());
- rprintf(FERROR, "%s: read error: %s\n",
- RSYNC_NAME, strerror(err));
exit_cleanup(RERR_STREAMIO);
}
/**
- * Read from a socket with IO timeout. return the number of bytes
+ * 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
*/
static int read_timeout(int fd, char *buf, size_t len)
{
- int n, ret=0;
+ int n, ret = 0;
- io_flush();
+ io_flush(NORMAL_FLUSH);
while (ret == 0) {
/* 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 (io_error_fd >= 0) {
- FD_SET(io_error_fd, &r_fds);
- if (io_error_fd >= fd_count) fd_count = io_error_fd+1;
+ if (msg_list_head) {
+ FD_SET(msg_fd_out, &w_fds);
+ 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 = io_timeout?io_timeout:SELECT_TIMEOUT;
+ tv.tv_sec = select_timeout;
tv.tv_usec = 0;
errno = 0;
- count = select(fd_count, &r_fds,
- io_filesfrom_buflen? &w_fds : NULL,
- NULL, &tv);
-
- if (count == 0) {
- check_timeout();
- }
+ count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
if (count <= 0) {
- if (errno == EBADF) {
+ if (errno == EBADF)
exit_cleanup(RERR_SOCKETIO);
- }
+ check_timeout();
continue;
}
- if (io_error_fd >= 0 && FD_ISSET(io_error_fd, &r_fds)) {
- read_error_fd();
- }
+ if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds))
+ msg_list_push(NORMAL_FLUSH);
if (io_filesfrom_f_out >= 0) {
if (io_filesfrom_buflen) {
io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1;
io_filesfrom_f_in = -1;
} else {
- extern int eol_nulls;
if (!eol_nulls) {
char *s = io_filesfrom_buf + l;
/* Transform CR and/or LF into '\0' */
}
}
- if (!FD_ISSET(fd, &r_fds)) continue;
+ if (!FD_ISSET(fd, &r_fds))
+ 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 (errno == EINTR || errno == EWOULDBLOCK ||
- errno == EAGAIN)
+ 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 (fd == sock_f_in && io_timeout)
+ last_io_in = time(NULL);
}
return ret;
{
char ch, *s, *eob = fname + MAXPATHLEN - 1;
int cnt;
- extern int io_timeout;
- extern int eol_nulls;
- extern char *remote_filesfrom_file;
- int reading_remotely = remote_filesfrom_file != NULL;
+ int reading_remotely = filesfrom_host != NULL;
int nulls = eol_nulls || reading_remotely;
start:
fd_set fds;
FD_ZERO(&fds);
FD_SET(fd, &fds);
- tv.tv_sec = io_timeout? io_timeout : SELECT_TIMEOUT;
+ tv.tv_sec = select_timeout;
tv.tv_usec = 0;
if (!select(fd+1, &fds, NULL, NULL, &tv))
check_timeout();
}
+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;
+ }
+}
+
+
+void maybe_flush_socket(void)
+{
+ if (iobuf_out && iobuf_out_cnt && 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)
+ return; /* there's nothing we can do */
+ write_int(sock_f_out, the_file_list->count);
+ write_shortint(sock_f_out, ITEM_IS_NEW);
+ }
+ if (iobuf_out)
+ io_flush(NORMAL_FLUSH);
+ }
+}
+
+
/**
* Continue trying to read len bytes - don't return until len has been
* read.
/**
* Read from the file descriptor handling multiplexing - return number
* of bytes read.
- *
- * Never returns <= 0.
+ *
+ * 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;
+ size_t msg_bytes;
int tag, ret = 0;
- char line[1024];
- static char *buffer;
- static size_t bufferIdx = 0;
- static size_t bufferSz;
+#if MAXPATHLEN < 4096
+ char line[4096+1024];
+#else
+ char line[MAXPATHLEN+1024];
+#endif
- 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;
read_loop(fd, line, 4);
tag = IVAL(line, 0);
- remaining = tag & 0xFFFFFF;
- tag = tag >> 24;
+ msg_bytes = tag & 0xFFFFFF;
+ tag = (tag >> 24) - MPLEX_BASE;
- if (tag == MPLEX_BASE) {
- if (!buffer || remaining > bufferSz) {
- buffer = realloc_array(buffer, char, remaining);
- if (!buffer) out_of_memory("read_unbuffered");
- bufferSz = remaining;
+ 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, buffer, remaining);
- bufferIdx = 0;
- continue;
- }
-
- tag -= MPLEX_BASE;
-
- if (tag != FERROR && tag != FINFO) {
- rprintf(FERROR, "unexpected tag %d\n", tag);
- exit_cleanup(RERR_STREAMIO);
- }
-
- if (remaining > sizeof line - 1) {
- rprintf(FERROR, "multiplexing overflow %ld\n\n",
- (long)remaining);
+ read_loop(fd, iobuf_in, msg_bytes);
+ remaining = msg_bytes;
+ iobuf_in_ndx = 0;
+ break;
+ case MSG_DELETED:
+ if (msg_bytes >= sizeof line)
+ goto overflow;
+ read_loop(fd, line, msg_bytes);
+ line[msg_bytes] = '\0';
+ /* A directory name was sent with the trailing null */
+ if (msg_bytes > 0 && !line[msg_bytes-1])
+ log_delete(line, S_IFDIR);
+ else
+ log_delete(line, S_IFREG);
+ break;
+ case MSG_SUCCESS:
+ if (msg_bytes != 4) {
+ 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_INFO:
+ case MSG_ERROR:
+ 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);
+ break;
+ default:
+ rprintf(FERROR, "unexpected tag %d [%s]\n",
+ tag, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
-
- read_loop(fd, line, remaining);
- line[remaining] = 0;
-
- rprintf((enum logcode) tag, "%s", line);
- remaining = 0;
}
if (remaining == 0)
- io_flush();
+ io_flush(NORMAL_FLUSH);
return ret;
}
static void readfd(int fd, char *buffer, size_t N)
{
int ret;
- size_t total=0;
+ 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;
+}
+
+
+int read_shortint(int f)
+{
+ uchar b[2];
+ readfd(f, (char *)b, 2);
+ return (b[1] << 8) + b[0];
}
readfd(f,b,4);
ret = IVAL(b,0);
- if (ret == (int32)0xffffffff) return -1;
+ if (ret == (int32)0xffffffff)
+ return -1;
return ret;
}
char b[8];
ret = read_int(f);
- if ((int32)ret != (int32)0xffffffff) {
+ 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);
- buf[len] = 0;
+ readfd(f, buf, len);
+ buf[len] = '\0';
}
-unsigned char read_byte(int f)
+uchar read_byte(int f)
{
- unsigned char c;
- read_buf(f, (char *)&c, 1);
+ 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)
+{
+ sum->count = read_int(f);
+ sum->blength = read_int(f);
+ if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) {
+ 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 > MD4_SUM_LENGTH) {
+ 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.
* 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)
{
- struct timeval tv;
+ 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)
return;
- assert(bytes_written > 0);
- assert(bwlimit > 0);
+ 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 -= elapsed_usec * bwlimit / (ONE_SEC/1024);
+ if (total_written < 0)
+ total_written = 0;
+ }
- tv.tv_usec = bytes_written * 1000 / bwlimit;
- tv.tv_sec = tv.tv_usec / 1000000;
- tv.tv_usec = tv.tv_usec % 1000000;
+ 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);
}
-/**
- * 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 certain circumstnces) 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, using_r_fds;
struct timeval tv;
- err_list_push();
-
no_flush++;
while (total < len) {
FD_ZERO(&w_fds);
FD_SET(fd,&w_fds);
- fd_count = fd;
+ maxfd = fd;
- if (io_error_fd >= 0) {
+ if (msg_fd_in >= 0 && len-total >= contiguous_write_len) {
FD_ZERO(&r_fds);
- FD_SET(io_error_fd,&r_fds);
- if (io_error_fd > fd_count)
- fd_count = io_error_fd;
- }
-
- tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT;
+ 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(fd_count+1,
- io_error_fd >= 0?&r_fds:NULL,
- &w_fds,NULL,
- &tv);
-
- if (count == 0) {
- check_timeout();
- }
+ count = select(maxfd + 1, using_r_fds ? &r_fds : NULL,
+ &w_fds, NULL, &tv);
if (count <= 0) {
- if (errno == EBADF) {
+ if (count < 0 && errno == EBADF)
exit_cleanup(RERR_SOCKETIO);
- }
+ check_timeout();
continue;
}
- if (io_error_fd >= 0 && FD_ISSET(io_error_fd, &r_fds)) {
- read_error_fd();
- }
+ if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds))
+ read_msg_fd();
+
+ if (!FD_ISSET(fd, &w_fds))
+ continue;
- if (FD_ISSET(fd, &w_fds)) {
- int ret;
- size_t n = len-total;
- ret = write(fd,buf+total,n);
+ 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();
- rprintf(FERROR, RSYNC_NAME
- ": writefd_unbuffered failed to write %ld bytes: phase \"%s\": %s\n",
- (long) len, io_write_phase,
- strerror(errno));
- 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) {
+ set_io_timeout(30);
+ ignore_timeout = 0;
+ 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 (io_timeout)
- last_io = time(NULL);
+ if (fd == sock_f_out) {
+ if (io_timeout || am_generator)
+ last_io_out = 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 logcode 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)) {
+ /* When the generator reads messages from the msg_fd_in pipe, it can
+ * cause output to occur down the socket. Setting contiguous_write_len
+ * prevents the reading of msg_fd_in once we actually start to write
+ * this sequence of data (though we might read it before the start). */
+ if (am_generator && msg_fd_in >= 0)
+ contiguous_write_len = len + 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);
+
+ if (am_generator && msg_fd_in >= 0)
+ contiguous_write_len = 0;
}
-void io_flush(void)
+void io_flush(int flush_it_all)
{
- int fd = multiplex_out_fd;
+ msg_list_push(flush_it_all);
- err_list_push();
-
- if (!io_buffer_count || no_flush) return;
+ if (!iobuf_out_cnt || no_flush)
+ return;
- if (io_multiplexing_out) {
- mplex_write(fd, FNONE, io_buffer, io_buffer_count);
- } else {
- writefd_unbuffered(fd, io_buffer, io_buffer_count);
- }
- io_buffer_count = 0;
+ if (io_multiplexing_out)
+ mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt);
+ else
+ writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt);
+ iobuf_out_cnt = 0;
}
-void io_end_buffering(void)
+static void writefd(int fd,char *buf,size_t len)
{
- io_flush();
- if (!io_multiplexing_out) {
- free(io_buffer);
- io_buffer = NULL;
+ if (fd == msg_fd_out) {
+ rprintf(FERROR, "Internal error: wrong write used in receiver.\n");
+ exit_cleanup(RERR_PROTOCOL);
}
-}
-static void writefd(int fd,char *buf,size_t len)
-{
- stats.total_written += len;
+ if (fd == sock_f_out)
+ stats.total_written += len;
- err_list_push();
+ if (fd == write_batch_monitor_out) {
+ if ((size_t)write(batch_fd, buf, len) != len)
+ exit_cleanup(RERR_FILEIO);
+ }
- if (!io_buffer || fd != multiplex_out_fd) {
+ 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) io_flush();
+ if (iobuf_out_cnt == IO_BUFFER_SIZE)
+ io_flush(NORMAL_FLUSH);
}
}
+void write_shortint(int f, int x)
+{
+ uchar b[2];
+ b[0] = x;
+ b[1] = x >> 8;
+ writefd(f, (char *)b, 2);
+}
+
+
void write_int(int f,int32 x)
{
char b[4];
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)
+void write_byte(int f, uchar c)
{
- write_buf(f,(char *)&c,1);
+ writefd(f, (char *)&c, 1);
}
+void write_vstring(int f, 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);
+}
/**
- * Read a line of up to @p maxlen characters into @p buf. Does not
- * contain a trailing newline or carriage return.
+ * Read a line of up to @p maxlen characters into @p buf (not counting
+ * the trailing null). Strips the (required) trailing newline and all
+ * carriage returns.
*
- * @return 1 for success; 0 for io error or truncation.
+ * @return 1 for success; 0 for I/O error or truncation.
**/
int read_line(int f, char *buf, size_t maxlen)
{
read_buf(f, buf, 1);
if (buf[0] == 0)
return 0;
- if (buf[0] == '\n') {
- buf[0] = 0;
+ if (buf[0] == '\n')
break;
- }
if (buf[0] != '\r') {
buf++;
maxlen--;
}
}
- if (maxlen == 0) {
- *buf = 0;
- return 0;
- }
-
- return 1;
+ *buf = '\0';
+ return maxlen > 0;
}
void io_printf(int fd, const char *format, ...)
{
- va_list ap;
+ va_list ap;
char buf[1024];
int len;
len = vsnprintf(buf, sizeof buf, format, ap);
va_end(ap);
- if (len < 0) exit_cleanup(RERR_STREAMIO);
+ if (len < 0)
+ exit_cleanup(RERR_STREAMIO);
write_sbuf(fd, buf);
}
-/** Setup for multiplexing an error stream with the data stream */
-void io_start_multiplex_out(int fd)
+/** Setup for multiplexing a MSG_* stream with the data stream. */
+void io_start_multiplex_out(void)
{
- multiplex_out_fd = fd;
- io_flush();
- io_start_buffering_out(fd);
+ io_flush(NORMAL_FLUSH);
+ io_start_buffering_out();
io_multiplexing_out = 1;
}
-/** Setup for multiplexing an error stream with the data stream */
-void io_start_multiplex_in(int fd)
+/** Setup for multiplexing a MSG_* stream with the data stream. */
+void io_start_multiplex_in(void)
{
- multiplex_in_fd = fd;
- io_flush();
+ io_flush(NORMAL_FLUSH);
+ io_start_buffering_in();
io_multiplexing_in = 1;
}
-/** Write an message to the multiplexed error stream */
-int io_multiplex_write(enum logcode code, char *buf, size_t len)
+/** Write an message to the multiplexed data stream. */
+int io_multiplex_write(enum msgcode code, char *buf, size_t len)
{
- if (!io_multiplexing_out) return 0;
+ if (!io_multiplexing_out)
+ return 0;
- io_flush();
+ io_flush(NORMAL_FLUSH);
stats.total_written += (len+4);
- mplex_write(multiplex_out_fd, code, buf, len);
+ mplex_write(code, buf, len);
return 1;
}
-/** Stop output multiplexing */
-void io_multiplexing_close(void)
+void close_multiplexing_in(void)
+{
+ io_multiplexing_in = 0;
+}
+
+/** Stop output multiplexing. */
+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