+/** 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 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;
+
+/* 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_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 int defer_forwarding_messages = 0;
+static int select_timeout = SELECT_TIMEOUT;
+static int active_filecnt = 0;
+static OFF_T active_bytecnt = 0;
+
+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_item {
+ struct msg_list_item *next;
+ int len;
+ char buf[1];
+};
+
+struct msg_list {
+ struct msg_list_item *head, *tail;
+};
+
+static struct msg_list msg2genr, msg2sndr;
+
+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)
+{
+ time_t t;
+
+ if (!io_timeout || ignore_timeout)
+ return;
+
+ if (!last_io_in) {
+ last_io_in = time(NULL);
+ return;
+ }
+
+ t = time(NULL);
+
+ 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_in));
+ }
+ exit_cleanup(RERR_TIMEOUT);
+ }
+}
+
+/* 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)
+{
+ 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, char *buf, int len)
+{
+ 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->len = len + 4;
+ 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;
+}
+
+/* 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;
+ 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(). */
+ msg_fd_in = -1;
+
+ read_loop(fd, buf, 4);
+ tag = IVAL(buf, 0);
+
+ len = tag & 0xFFFFFF;
+ tag = (tag >> 24) - MPLEX_BASE;
+
+ 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);
+ if (remove_sent_files)
+ decrement_active_files(IVAL(buf,0));
+ 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);
+ send_msg(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) {
+ decrement_active_files(IVAL(buf,0));
+ send_msg(MSG_SUCCESS, buf, len);
+ }
+ if (preserve_hard_links)
+ flist_ndx_push(&hlink_list, IVAL(buf,0));
+ break;
+ case MSG_SOCKERR:
+ if (!am_generator) {
+ rprintf(FERROR, "invalid message %d:%d\n", tag, len);
+ exit_cleanup(RERR_STREAMIO);
+ }
+ close_multiplexing_out();
+ /* FALL THROUGH */
+ 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(tag, buf, n);
+ len -= n;
+ }
+ break;
+ default:
+ rprintf(FERROR, "unknown message %d:%d [%s]\n",
+ tag, len, who_am_i());
+ exit_cleanup(RERR_STREAMIO);
+ }
+
+ msg_fd_in = fd;
+}
+
+/* This is used by the generator to limit how many file transfers can
+ * be active at once when --remove-sent-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)
+{
+ /* TODO: tune these limits? */
+ while (active_filecnt >= (active_bytecnt >= 128*1024 ? 10 : 50)) {
+ if (hlink_list.head)
+ check_for_finished_hlinks(itemizing, code);
+ read_msg_fd();
+ }
+
+ active_filecnt++;
+ active_bytecnt += the_file_list->files[ndx]->length;
+}
+
+void decrement_active_files(int ndx)
+{
+ active_filecnt--;
+ active_bytecnt -= the_file_list->files[ndx]->length;
+}
+
+/* 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. */
+static int msg2genr_flush(int flush_it_all)
+{
+ static int written = 0;
+ struct timeval tv;
+ fd_set fds;
+
+ if (msg_fd_out < 0)
+ return -1;
+
+ while (msg2genr.head) {
+ struct msg_list_item *m = msg2genr.head;
+ int n = write(msg_fd_out, m->buf + written, m->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) == m->len) {
+ msg2genr.head = m->next;
+ if (!msg2genr.head)
+ msg2genr.tail = NULL;
+ free(m);
+ written = 0;
+ }
+ }
+ return 1;
+}
+
+int send_msg(enum msgcode code, char *buf, int len)
+{
+ if (msg_fd_out < 0) {
+ if (!defer_forwarding_messages)
+ return io_multiplex_write(code, buf, len);
+ if (!io_multiplexing_out)
+ return 0;
+ msg_list_add(&msg2sndr, code, buf, len);
+ return 1;
+ }
+ msg_list_add(&msg2genr, code, buf, len);
+ msg2genr_flush(NORMAL_FLUSH);
+ 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();
+ }
+
+ 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 the io_filesfrom_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;
+ io_filesfrom_bp = io_filesfrom_buf;
+ io_filesfrom_lastchar = '\0';
+ 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 (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(NORMAL_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 (msg2genr.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;
+ if (io_filesfrom_buflen == 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)
+ exit_cleanup(RERR_SOCKETIO);
+ check_timeout();
+ continue;
+ }
+
+ if (msg2genr.head && FD_ISSET(msg_fd_out, &w_fds))
+ msg2genr_flush(NORMAL_FLUSH);
+
+ if (io_filesfrom_f_out >= 0) {
+ if (io_filesfrom_buflen) {
+ if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {
+ int l = write(io_filesfrom_f_out,
+ io_filesfrom_bp,
+ io_filesfrom_buflen);
+ if (l > 0) {
+ if (!(io_filesfrom_buflen -= l))
+ io_filesfrom_bp = io_filesfrom_buf;
+ else
+ io_filesfrom_bp += l;
+ } else {
+ /* 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)) {
+ int l = read(io_filesfrom_f_in,
+ io_filesfrom_buf,
+ sizeof io_filesfrom_buf);
+ if (l <= 0) {
+ /* Send end-of-file marker */
+ io_filesfrom_buf[0] = '\0';
+ io_filesfrom_buf[1] = '\0';
+ io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1;
+ io_filesfrom_f_in = -1;
+ } else {
+ if (!eol_nulls) {
+ char *s = io_filesfrom_buf + l;
+ /* Transform CR and/or LF into '\0' */
+ while (s-- > io_filesfrom_buf) {
+ if (*s == '\n' || *s == '\r')
+ *s = '\0';
+ }
+ }
+ if (!io_filesfrom_lastchar) {
+ /* Last buf ended with a '\0', so don't
+ * let this buf start with one. */
+ while (l && !*io_filesfrom_bp)
+ io_filesfrom_bp++, l--;
+ }
+ if (!l)
+ io_filesfrom_bp = io_filesfrom_buf;
+ else {
+ char *f = io_filesfrom_bp;
+ char *t = f;
+ char *eob = f + l;
+ /* Eliminate any multi-'\0' runs. */
+ while (f != eob) {
+ if (!(*t++ = *f++)) {
+ while (f != eob && !*f)
+ f++, l--;
+ }
+ }
+ io_filesfrom_lastchar = f[-1];
+ }
+ io_filesfrom_buflen = 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) {
+ close_multiplexing_out();
+ rsyserr(FSOCKERR, 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 "fname" buffer (which must be at least MAXPATHLEN
+ * characters long).
+ */
+int read_filesfrom_line(int fd, char *fname)
+{
+ char ch, *s, *eob = fname + MAXPATHLEN - 1;
+ int cnt;
+ int reading_remotely = filesfrom_host != NULL;
+ int nulls = eol_nulls || reading_remotely;
+
+ start:
+ s = fname;
+ while (1) {
+ cnt = read(fd, &ch, 1);
+ if (cnt < 0 && (errno == EWOULDBLOCK
+ || errno == EINTR || errno == EAGAIN)) {
+ struct timeval tv;
+ fd_set fds;
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ tv.tv_sec = select_timeout;
+ tv.tv_usec = 0;
+ if (!select(fd+1, &fds, NULL, NULL, &tv))
+ check_timeout();
+ continue;
+ }
+ if (cnt != 1)
+ break;
+ if (nulls? !ch : (ch == '\r' || ch == '\n')) {
+ /* Skip empty lines if reading locally. */
+ if (!reading_remotely && s == fname)
+ continue;
+ break;
+ }
+ if (s < eob)
+ *s++ = ch;
+ }
+ *s = '\0';
+
+ /* Dump comments. */
+ if (*fname == '#' || *fname == ';')
+ goto start;
+
+ return s - fname;
+}
+
+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");
+}