-/*
- Copyright (C) Andrew Tridgell 1996
- Copyright (C) Paul Mackerras 1996
-
- 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.
-*/
+/* -*- c-file-style: "linux" -*-
+ *
+ * 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 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
+ * stdout normally carries the binary data stream, and stderr all our
+ * error messages.
+ *
+ * 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().
+ **/
-/*
- Utilities used in rsync
-
- tridge, June 1996
- */
#include "rsync.h"
-static int64 total_written;
-static int64 total_read;
+/** If no timeout is specified then use a 60 second select timeout */
+#define SELECT_TIMEOUT 60
-extern int verbose;
-extern int sparse_files;
+extern int bwlimit;
+extern size_t bwlimit_writemax;
extern int io_timeout;
-
-int64 write_total(void)
+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
+ * remote instance crashed. Just giving the offset on the stream is
+ * not very helpful. So instead we try to make io_phase_name point to
+ * something useful.
+ *
+ * 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 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 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)
{
- return total_written;
+ 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;
}
-int64 read_total(void)
+static int flist_ndx_pop(struct flist_ndx_list *lp)
{
- return total_read;
-}
+ struct flist_ndx_item *next;
+ int ndx;
-static int buffer_f_in = -1;
+ if (!lp->head)
+ return -1;
-void setup_nonblocking(int f_in,int f_out)
-{
- set_blocking(f_out,0);
- buffer_f_in = f_in;
+ 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);
-static char *read_buffer;
-static char *read_buffer_p;
-static int read_buffer_len;
-static int read_buffer_size;
+ 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;
+}
-/* This function was added to overcome a deadlock problem when using
- * ssh. It looks like we can't allow our receive queue to get full or
- * ssh will clag up. Uggh. */
-static void read_check(int f)
+void set_io_timeout(int secs)
{
- int n;
+ io_timeout = secs;
- if (f == -1) return;
+ if (!io_timeout || io_timeout > SELECT_TIMEOUT)
+ select_timeout = SELECT_TIMEOUT;
+ else
+ select_timeout = io_timeout;
- if (read_buffer_len == 0) {
- read_buffer_p = read_buffer;
- }
+ allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2;
+}
- if ((n=num_waiting(f)) <= 0)
- return;
+/* 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;
+}
- /* things could deteriorate if we read in really small chunks */
- if (n < 10) n = 1024;
+/* 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);
+}
- if (read_buffer_p != read_buffer) {
- memmove(read_buffer,read_buffer_p,read_buffer_len);
- read_buffer_p = read_buffer;
- }
+/* 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;
+}
- if (n > (read_buffer_size - read_buffer_len)) {
- read_buffer_size += n;
- if (!read_buffer)
- read_buffer = (char *)malloc(read_buffer_size);
- else
- read_buffer = (char *)realloc(read_buffer,read_buffer_size);
- if (!read_buffer) out_of_memory("read check");
- read_buffer_p = read_buffer;
- }
+/* 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);
+ if (defer_forwarding_messages)
+ msg_list_add(&msg2sndr, MSG_DELETED, buf, len);
+ else
+ 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) {
+ decrement_active_files(IVAL(buf,0));
+ if (defer_forwarding_messages)
+ msg_list_add(&msg2sndr, MSG_SUCCESS, buf, len);
+ else
+ io_multiplex_write(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);
+ if (am_generator && am_server && defer_forwarding_messages)
+ msg_list_add(&msg2sndr, tag, buf, n);
+ else
+ rwrite((enum logcode)tag, buf, n);
+ len -= n;
+ }
+ break;
+ default:
+ rprintf(FERROR, "unknown message %d:%d [%s]\n",
+ tag, len, who_am_i());
+ exit_cleanup(RERR_STREAMIO);
+ }
- n = read(f,read_buffer+read_buffer_len,n);
- if (n > 0) {
- read_buffer_len += n;
- }
+ msg_fd_in = fd;
}
-static time_t last_io;
+/* 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;
+}
-static void check_timeout(void)
+/* 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)
{
- time_t t;
-
- if (!io_timeout) return;
+ 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;
+}
- if (!last_io) {
- last_io = time(NULL);
+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(&msg2genr, code, buf, len);
+ msg2genr_flush(NORMAL_FLUSH);
+}
- t = time(NULL);
+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;
+}
- if (last_io && io_timeout && (t-last_io)>io_timeout) {
- fprintf(FERROR,"read timeout after %d second - exiting\n",
- (int)(t-last_io));
- exit_cleanup(1);
+/* 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);
}
-static int readfd(int fd,char *buffer,int N)
+/**
+ * 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 ret;
- int total=0;
- struct timeval tv;
-
- if (read_buffer_len < N)
- read_check(buffer_f_in);
-
- while (total < N) {
- if (read_buffer_len > 0 && buffer_f_in == fd) {
- ret = MIN(read_buffer_len,N-total);
- memcpy(buffer+total,read_buffer_p,ret);
- read_buffer_p += ret;
- read_buffer_len -= ret;
+ 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;
- }
+ }
- while ((ret = read(fd,buffer + total,N-total)) == -1) {
- fd_set fds;
+ 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 (errno != EAGAIN && errno != EWOULDBLOCK)
- return -1;
+ 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 = io_timeout;
+ tv.tv_sec = select_timeout;
tv.tv_usec = 0;
-
- if (select(fd+1, &fds, NULL, NULL, &tv) != 1) {
+ 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");
+}
+
+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.
+ **/
+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)
+{
+ static size_t remaining;
+ static size_t iobuf_in_ndx;
+ size_t msg_bytes;
+ int tag, cnt = 0;
+ char line[BIGPATHBUFLEN];
+
+ if (!iobuf_in || fd != sock_f_in)
+ return read_timeout(fd, buf, len);
+
+ if (!io_multiplexing_in && remaining == 0) {
+ remaining = read_timeout(fd, iobuf_in, iobuf_in_siz);
+ iobuf_in_ndx = 0;
+ }
+
+ while (cnt == 0) {
+ if (remaining) {
+ len = MIN(len, remaining);
+ memcpy(buf, iobuf_in + iobuf_in_ndx, len);
+ iobuf_in_ndx += len;
+ 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);
+ remaining = msg_bytes;
+ iobuf_in_ndx = 0;
+ break;
+ case MSG_DELETED:
+ if (msg_bytes >= sizeof line)
+ goto overflow;
+ 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) {
+ 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);
}
+ }
+
+ if (remaining == 0)
+ io_flush(NORMAL_FLUSH);
+
+ return cnt;
+}
- if (ret <= 0)
- return total;
- total += ret;
+/**
+ * Do a buffered read from @p fd. Don't return until all @p n bytes
+ * have been read. If all @p 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 (io_timeout)
- last_io = time(NULL);
- return total;
+ 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];
+}
-int read_int(int f)
+int32 read_int(int f)
{
- int ret;
- char b[4];
- if ((ret=readfd(f,b,4)) != 4) {
- if (verbose > 1)
- fprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
- getpid(),4,ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_read += 4;
- return IVAL(b,0);
+ char b[4];
+ int32 num;
+
+ readfd(f,b,4);
+ num = IVAL(b,0);
+ if (num == (int32)0xffffffff)
+ return -1;
+ return num;
}
int64 read_longint(int f)
{
- extern int remote_version;
- int64 ret;
+ int64 num;
char b[8];
- ret = read_int(f);
+ num = read_int(f);
- if (ret != -1) return ret;
+ if ((int32)num != (int32)0xffffffff)
+ return num;
-#ifndef HAVE_LONGLONG
- fprintf(FERROR,"Integer overflow - attempted 64 bit offset\n");
- exit_cleanup(1);
+#if SIZEOF_INT64 < 8
+ rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
+ exit_cleanup(RERR_UNSUPPORTED);
#else
- if (remote_version >= 16) {
- if ((ret=readfd(f,b,8)) != 8) {
- if (verbose > 1)
- fprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
- getpid(),8,ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_read += 8;
- ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
- }
+ readfd(f,b,8);
+ num = IVAL(b,0) | (((int64)IVAL(b,4))<<32);
#endif
- return ret;
+ return num;
+}
+
+void read_buf(int f,char *buf,size_t len)
+{
+ readfd(f,buf,len);
}
-void read_buf(int f,char *buf,int len)
+void read_sbuf(int f,char *buf,size_t len)
{
- int ret;
- if ((ret=readfd(f,buf,len)) != len) {
- if (verbose > 1)
- fprintf(FERROR,"(%d) Error reading %d bytes : %s\n",
- getpid(),len,ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_read += len;
+ 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);
- return c;
+ 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;
+ }
-static char last_byte;
-static int last_sparse;
+ if (len)
+ readfd(f, buf, len);
+ buf[len] = '\0';
+ return len;
+}
-int sparse_end(int f)
+/* 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)
{
- if (last_sparse) {
- lseek(f,-1,SEEK_CUR);
- return (write(f,&last_byte,1) == 1 ? 0 : -1);
- }
- last_sparse = 0;
- return 0;
+ 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_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);
+ }
}
-int write_sparse(int f,char *buf,int len)
+/* 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)
{
- int l1=0,l2=0;
- int ret;
+ static struct sum_struct null_sum;
+
+ if (sum == NULL)
+ sum = &null_sum;
- if (!sparse_files)
- return write(f,buf,len);
+ write_int(f, sum->count);
+ write_int(f, sum->blength);
+ if (protocol_version >= 27)
+ write_int(f, sum->s2length);
+ write_int(f, sum->remainder);
+}
- for (l1=0;l1<len && buf[l1]==0;l1++) ;
- for (l2=0;l2<(len-l1) && buf[len-(l2+1)]==0;l2++) ;
+/**
+ * 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;
- last_byte = buf[len-1];
+#define ONE_SEC 1000000L /* # of microseconds in a second */
- if (l1 == len || l2 > 0)
- last_sparse=1;
+ if (!bwlimit_writemax)
+ return;
- if (l1 > 0)
- lseek(f,l1,SEEK_CUR);
+ total_written += bytes_written;
- if (l1 == len)
- return len;
+ 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;
+ }
- if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) {
- if (ret == -1 || ret == 0) return ret;
- return (l1+ret);
- }
+ sleep_usec = total_written * (ONE_SEC/1024) / bwlimit;
+ if (sleep_usec < ONE_SEC / 10) {
+ prior_tv = start_tv;
+ return;
+ }
- if (l2 > 0)
- lseek(f,l2,SEEK_CUR);
+ tv.tv_sec = sleep_usec / ONE_SEC;
+ tv.tv_usec = sleep_usec % ONE_SEC;
+ select(0, NULL, NULL, NULL, &tv);
- return len;
+ 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 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,char *buf,size_t len)
+{
+ size_t n, total = 0;
+ fd_set w_fds, r_fds;
+ int maxfd, count, cnt, using_r_fds;
+ int defer_save = defer_forwarding_messages;
+ struct timeval tv;
+
+ no_flush++;
+
+ while (total < len) {
+ FD_ZERO(&w_fds);
+ FD_SET(fd,&w_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, NULL, &tv);
+
+ if (count <= 0) {
+ if (count < 0 && errno == EBADF)
+ exit_cleanup(RERR_SOCKETIO);
+ check_timeout();
+ continue;
+ }
+
+ 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)
+ 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);
+ }
+
+ total += cnt;
+ defer_forwarding_messages = 1;
+
+ if (fd == sock_f_out) {
+ if (io_timeout || am_generator)
+ last_io_out = time(NULL);
+ sleep_for_bwlimit(cnt);
+ }
+ }
+
+ defer_forwarding_messages = defer_save;
+ no_flush--;
+}
-static int writefd(int fd,char *buf,int len)
+static void msg2sndr_flush(void)
{
- int total = 0;
- fd_set w_fds, r_fds;
- int fd_count, count, got_select=0;
- struct timeval tv;
+ if (defer_forwarding_messages)
+ return;
- if (buffer_f_in == -1)
- return write(fd,buf,len);
+ while (msg2sndr.head && io_multiplexing_out) {
+ struct msg_list_item *m = msg2sndr.head;
+ if (!(msg2sndr.head = m->next))
+ msg2sndr.tail = NULL;
+ stats.total_written += m->len;
+ defer_forwarding_messages = 1;
+ writefd_unbuffered(sock_f_out, m->buf, m->len);
+ defer_forwarding_messages = 0;
+ free(m);
+ }
+}
- while (total < len) {
- int ret = write(fd,buf+total,len-total);
+/**
+ * Write an message to a multiplexed stream. If this fails then rsync
+ * exits.
+ **/
+static void mplex_write(enum msgcode code, char *buf, size_t len)
+{
+ char buffer[1024];
+ size_t n = len;
- if (ret == 0) return total;
+ SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
- if (ret == -1 && !(errno == EWOULDBLOCK || errno == EAGAIN))
- return -1;
+ if (n > sizeof buffer - 4)
+ n = 0;
+ else
+ memcpy(buffer + 4, buf, n);
- if (ret == -1 && got_select) {
- /* hmmm, we got a write select on the fd and then failed to write.
- Why doesn't that mean that the fd is dead? It doesn't on some
- systems it seems (eg. IRIX) */
- u_sleep(1000);
-#if 0
- fprintf(FERROR,"write exception\n");
- exit_cleanup(1);
-#endif
- }
+ writefd_unbuffered(sock_f_out, buffer, n+4);
+
+ len -= n;
+ buf += n;
+
+ if (len) {
+ defer_forwarding_messages = 1;
+ writefd_unbuffered(sock_f_out, buf, len);
+ defer_forwarding_messages = 0;
+ msg2sndr_flush();
+ }
+}
- got_select = 0;
+void io_flush(int flush_it_all)
+{
+ msg2genr_flush(flush_it_all);
+ msg2sndr_flush();
+
+ if (!iobuf_out_cnt || no_flush)
+ return;
+ 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;
+}
- if (ret == -1) {
- read_check(buffer_f_in);
+static void writefd(int fd,char *buf,size_t len)
+{
+ if (fd == msg_fd_out) {
+ rprintf(FERROR, "Internal error: wrong write used in receiver.\n");
+ exit_cleanup(RERR_PROTOCOL);
+ }
- fd_count = fd+1;
- FD_ZERO(&w_fds);
- FD_ZERO(&r_fds);
- FD_SET(fd,&w_fds);
- if (buffer_f_in != -1) {
- FD_SET(buffer_f_in,&r_fds);
- if (buffer_f_in > fd)
- fd_count = buffer_f_in+1;
- }
+ if (fd == sock_f_out)
+ stats.total_written += len;
- tv.tv_sec = BLOCKING_TIMEOUT;
- tv.tv_usec = 0;
- count = select(fd_count,buffer_f_in == -1? NULL: &r_fds,
- &w_fds,NULL,&tv);
- if (count == -1 && errno != EINTR) {
- if (verbose > 1)
- fprintf(FERROR,"select error: %s\n", strerror(errno));
- exit_cleanup(1);
- }
+ if (fd == write_batch_monitor_out) {
+ if ((size_t)write(batch_fd, buf, len) != len)
+ exit_cleanup(RERR_FILEIO);
+ }
- if (count == 0) {
- check_timeout();
- continue;
- }
-
- if (FD_ISSET(fd, &w_fds)) {
- got_select = 1;
- }
- } else {
- total += ret;
- }
- }
+ if (!iobuf_out || fd != sock_f_out) {
+ writefd_unbuffered(fd, buf, len);
+ return;
+ }
- if (io_timeout)
- last_io = time(NULL);
+ 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;
+ }
- return total;
+ 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];
+ SIVAL(b,0,x);
+ writefd(f,b,4);
+}
-void write_int(int f,int x)
+void write_int_named(int f, int32 x, const char *phase)
{
- int ret;
- char b[4];
- SIVAL(b,0,x);
- if ((ret=writefd(f,b,4)) != 4) {
- fprintf(FERROR,"write_int failed : %s\n",
- ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_written += 4;
+ io_write_phase = phase;
+ write_int(f, x);
+ io_write_phase = phase_unknown;
}
+/*
+ * 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)
{
- extern int remote_version;
char b[8];
- int ret;
- if (remote_version < 16 || x <= 0x7FFFFFFF) {
+ if (x <= 0x7FFFFFFF) {
write_int(f, (int)x);
return;
}
- write_int(f, -1);
+#if SIZEOF_INT64 < 8
+ rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
+ exit_cleanup(RERR_UNSUPPORTED);
+#else
+ write_int(f, (int32)0xFFFFFFFF);
SIVAL(b,0,(x&0xFFFFFFFF));
SIVAL(b,4,((x>>32)&0xFFFFFFFF));
- if ((ret=writefd(f,b,8)) != 8) {
- fprintf(FERROR,"write_longint failed : %s\n",
- ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
+ writefd(f,b,8);
+#endif
+}
+
+void write_buf(int f,char *buf,size_t len)
+{
+ writefd(f,buf,len);
+}
+
+/** Write a string to the connection */
+void write_sbuf(int f, char *buf)
+{
+ writefd(f, buf, strlen(buf));
+}
+
+void write_byte(int f, uchar c)
+{
+ 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;
}
- total_written += 8;
+ *lb = len;
+
+ writefd(f, (char*)lenbuf, lb - lenbuf + 1);
+ if (len)
+ writefd(f, str, len);
}
-void write_buf(int f,char *buf,int len)
+/**
+ * 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 I/O error or truncation.
+ **/
+int read_line(int f, char *buf, size_t maxlen)
{
- int ret;
- if ((ret=writefd(f,buf,len)) != len) {
- fprintf(FERROR,"write_buf failed : %s\n",
- ret==-1?strerror(errno):"EOF");
- exit_cleanup(1);
- }
- total_written += len;
+ while (maxlen) {
+ buf[0] = 0;
+ read_buf(f, buf, 1);
+ if (buf[0] == 0)
+ return 0;
+ if (buf[0] == '\n')
+ break;
+ if (buf[0] != '\r') {
+ buf++;
+ maxlen--;
+ }
+ }
+ *buf = '\0';
+ return maxlen > 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);
-void write_byte(int f,unsigned char c)
+ 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();
+ io_multiplexing_out = 1;
+}
+
+/** Setup for multiplexing a MSG_* stream with the data stream. */
+void io_start_multiplex_in(void)
{
- write_buf(f,(char *)&c,1);
+ io_flush(NORMAL_FLUSH);
+ io_start_buffering_in();
+ io_multiplexing_in = 1;
}
-void write_flush(int f)
+/** 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;
+
+ io_flush(NORMAL_FLUSH);
+ stats.total_written += (len+4);
+ mplex_write(code, buf, len);
+ return 1;
}
+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;
+}