X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/13c7bcbb2be2fc580af0ade159c2b85c4e3cd3b0..7448177753f8a69cb0edf396e05094642b9bcbc8:/io.c diff --git a/io.c b/io.c index 38386b69..e5574025 100644 --- a/io.c +++ b/io.c @@ -1,19 +1,19 @@ /* -*- 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 - * + * * 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. @@ -22,7 +22,7 @@ /** * @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 @@ -39,23 +39,25 @@ /** 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 am_server; extern int am_daemon; extern int am_sender; +extern int am_generator; +extern int eol_nulls; +extern int csum_length; +extern int checksum_seed; +extern int protocol_version; +extern char *remote_filesfrom_file; extern struct stats stats; - const char phase_unknown[] = "unknown"; +int select_timeout = SELECT_TIMEOUT; +int batch_fd = -1; +int batch_gen_fd = -1; /** * The connection might be dropped at some point; perhaps because the @@ -63,9 +65,9 @@ const char phase_unknown[] = "unknown"; * 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. @@ -80,6 +82,16 @@ int kludge_around_eof = False; int msg_fd_in = -1; int msg_fd_out = -1; +static int io_multiplexing_out; +static int io_multiplexing_in; +static int sock_f_in = -1; +static int sock_f_out = -1; +static time_t last_io; +static int no_flush; + +static int write_batch_monitor_in = -1; +static int write_batch_monitor_out = -1; + static int io_filesfrom_f_in = -1; static int io_filesfrom_f_out = -1; static char io_filesfrom_buf[2048]; @@ -135,26 +147,34 @@ static void check_timeout(void) t = time(NULL); - if (last_io && io_timeout && (t-last_io) >= io_timeout) { + if (t - last_io >= io_timeout) { if (!am_server && !am_daemon) { - rprintf(FERROR,"io timeout after %d seconds - exiting\n", + rprintf(FERROR, "io timeout after %d seconds -- exiting\n", (int)(t-last_io)); } exit_cleanup(RERR_TIMEOUT); } } -/** Setup the fd used to receive MSG_* messages. Only needed when - * we're the generator because the sender and receiver both use the - * multiplexed IO setup. */ +/* Note the fds used for the main socket (which might really be a pipe + * for a local transfer, but we can ignore that). */ +void io_set_sock_fds(int f_in, int f_out) +{ + sock_f_in = f_in; + sock_f_out = f_out; +} + +/* Setup the fd used to receive MSG_* messages. Only needed during the + * early stages of being a local sender (up through the sending of the + * file list) or when we're the generator (to fetch the messages from + * the receiver). */ void set_msg_fd_in(int fd) { msg_fd_in = fd; } -/** Setup the fd used to send our MSG_* messages. Only needed when - * we're the receiver because the generator and the sender both use - * the multiplexed IO setup. */ +/* Setup the fd used to send our MSG_* messages. Only needed when + * we're the receiver (to send our messages to the generator). */ void set_msg_fd_out(int fd) { msg_fd_out = fd; @@ -187,17 +207,19 @@ void send_msg(enum msgcode code, char *buf, int len) msg_list_push(NORMAL_FLUSH); } -/** Read a message from the MSG_* fd and dispatch it. This is only - * called by the generator. */ +/* Read a message from the MSG_* fd and handle it. This is called either + * during the early stages of being a local sender (up through the sending + * of the file list) or when we're the generator (to fetch the messages + * from the receiver). */ static void read_msg_fd(void) { - char buf[200]; + char buf[2048]; size_t n; int fd = msg_fd_in; int tag, len; - /* Temporarily disable msg_fd_in. This is needed because we - * may call a write routine that could try to call us back. */ + /* Temporarily disable msg_fd_in. This is needed to avoid looping back + * to this routine from read_timeout() and writefd_unbuffered(). */ msg_fd_in = -1; read_loop(fd, buf, 4); @@ -208,14 +230,14 @@ static void read_msg_fd(void) switch (tag) { case MSG_DONE: - if (len != 0) { + if (len != 0 || !am_generator) { rprintf(FERROR, "invalid message %d:%d\n", tag, len); exit_cleanup(RERR_STREAMIO); } redo_list_add(-1); break; case MSG_REDO: - if (len != 4) { + if (len != 4 || !am_generator) { rprintf(FERROR, "invalid message %d:%d\n", tag, len); exit_cleanup(RERR_STREAMIO); } @@ -244,7 +266,7 @@ static void read_msg_fd(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 called by the receiver. */ + * This is only active in the receiver. */ int msg_list_push(int flush_it_all) { static int written = 0; @@ -266,7 +288,7 @@ int msg_list_push(int flush_it_all) return 0; FD_ZERO(&fds); FD_SET(msg_fd_out, &fds); - tv.tv_sec = io_timeout ? io_timeout : SELECT_TIMEOUT; + tv.tv_sec = select_timeout; tv.tv_usec = 0; if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) check_timeout(); @@ -329,34 +351,21 @@ void io_set_filesfrom_fds(int f_in, int f_out) * program where that is a problem (start_socket_client), * kludge_around_eof is True and we just exit. */ -static void whine_about_eof(void) +static void whine_about_eof(int fd) { - if (kludge_around_eof) + if (kludge_around_eof && fd == sock_f_in) exit_cleanup(0); - else { - rprintf(FERROR, - "%s: connection unexpectedly closed " - "(%.0f bytes read so far)\n", - RSYNC_NAME, (double)stats.total_read); - - exit_cleanup(RERR_STREAMIO); - } -} + rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " + "(%.0f bytes received so far) [%s]\n", + (double)stats.total_read, who_am_i()); -static void die_from_readerr(int err) -{ - /* this prevents us trying to write errors on a dead socket */ - io_multiplexing_close(); - - 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 @@ -368,7 +377,7 @@ static void die_from_readerr(int err) */ static int read_timeout(int fd, char *buf, size_t len) { - int n, ret=0; + int n, ret = 0; io_flush(NORMAL_FLUSH); @@ -376,15 +385,20 @@ static int read_timeout(int fd, char *buf, size_t len) /* until we manage to read *something* */ fd_set r_fds, w_fds; struct timeval tv; - int fd_count = fd+1; + int maxfd = fd; int count; FD_ZERO(&r_fds); + FD_ZERO(&w_fds); FD_SET(fd, &r_fds); if (msg_fd_in >= 0) { FD_SET(msg_fd_in, &r_fds); - if (msg_fd_in >= fd_count) - fd_count = msg_fd_in+1; + if (msg_fd_in > maxfd) + maxfd = msg_fd_in; + } else if (msg_list_head) { + FD_SET(msg_fd_out, &w_fds); + if (msg_fd_out > maxfd) + maxfd = msg_fd_out; } if (io_filesfrom_f_out >= 0) { int new_fd; @@ -397,37 +411,31 @@ static int read_timeout(int fd, char *buf, size_t len) 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) { - msg_list_push(NORMAL_FLUSH); - 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 (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) read_msg_fd(); + else 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) { @@ -457,7 +465,6 @@ static int read_timeout(int fd, char *buf, size_t len) 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' */ @@ -493,26 +500,31 @@ static int read_timeout(int fd, char *buf, size_t len) } } - 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 (io_timeout && fd == sock_f_in) + last_io = time(NULL); } return ret; @@ -526,9 +538,6 @@ int read_filesfrom_line(int fd, char *fname) { 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 nulls = eol_nulls || reading_remotely; @@ -542,7 +551,7 @@ int read_filesfrom_line(int fd, char *fname) 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(); @@ -569,6 +578,42 @@ int read_filesfrom_line(int fd, char *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; + } +} + + /** * Continue trying to read len bytes - don't return until len has been * read. @@ -587,36 +632,29 @@ static void read_loop(int fd, char *buf, size_t len) /** * 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; int tag, ret = 0; char line[1024]; - static char *buffer; - static size_t bufferIdx = 0; - static size_t bufferSz; - if (fd != multiplex_in_fd) + if (!iobuf_in || fd != sock_f_in) return read_timeout(fd, buf, len); if (!io_multiplexing_in && remaining == 0) { - if (!buffer) { - bufferSz = 2 * IO_BUFFER_SIZE; - buffer = new_array(char, bufferSz); - if (!buffer) out_of_memory("read_unbuffered"); - } - remaining = read_timeout(fd, buffer, bufferSz); - bufferIdx = 0; + remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); + iobuf_in_ndx = 0; } while (ret == 0) { if (remaining) { len = MIN(len, remaining); - memcpy(buf, buffer + bufferIdx, len); - bufferIdx += len; + memcpy(buf, iobuf_in + iobuf_in_ndx, len); + iobuf_in_ndx += len; remaining -= len; ret = len; break; @@ -630,19 +668,21 @@ static int read_unbuffered(int fd, char *buf, size_t len) switch (tag) { case MSG_DATA: - if (!buffer || remaining > bufferSz) { - buffer = realloc_array(buffer, char, remaining); - if (!buffer) out_of_memory("read_unbuffered"); - bufferSz = remaining; + if (remaining > iobuf_in_siz) { + if (!(iobuf_in = realloc_array(iobuf_in, char, + remaining))) + out_of_memory("readfd_unbuffered"); + iobuf_in_siz = remaining; } - read_loop(fd, buffer, remaining); - bufferIdx = 0; + read_loop(fd, iobuf_in, remaining); + iobuf_in_ndx = 0; break; case MSG_INFO: case MSG_ERROR: if (remaining >= sizeof line) { - rprintf(FERROR, "multiplexing overflow %d:%ld\n\n", - tag, (long)remaining); + rprintf(FERROR, + "[%s] multiplexing overflow %d:%ld\n\n", + who_am_i(), tag, (long)remaining); exit_cleanup(RERR_STREAMIO); } read_loop(fd, line, remaining); @@ -650,7 +690,8 @@ static int read_unbuffered(int fd, char *buf, size_t len) remaining = 0; break; default: - rprintf(FERROR, "unexpected tag %d\n", tag); + rprintf(FERROR, "[%s] unexpected tag %d\n", + who_am_i(), tag); exit_cleanup(RERR_STREAMIO); } } @@ -671,14 +712,28 @@ static int read_unbuffered(int fd, char *buf, size_t len) 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; +} + + +unsigned short read_short(int f) +{ + uchar b[2]; + readfd(f, (char *)b, 2); + return (b[1] << 8) + b[0]; } @@ -689,7 +744,8 @@ int32 read_int(int f) readfd(f,b,4); ret = IVAL(b,0); - if (ret == (int32)0xffffffff) return -1; + if (ret == (int32)0xffffffff) + return -1; return ret; } @@ -699,12 +755,11 @@ int64 read_longint(int f) 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); @@ -721,17 +776,59 @@ void read_buf(int f,char *buf,size_t len) void read_sbuf(int f,char *buf,size_t len) { - read_buf(f,buf,len); + readfd(f, buf, len); buf[len] = 0; } -unsigned char read_byte(int f) +uchar read_byte(int f) { - unsigned char c; - read_buf(f, (char *)&c, 1); + uchar c; + readfd(f, (char *)&c, 1); return c; } +/* Populate a sum_struct with values from the socket. This is + * called by both the sender and the receiver. */ +void read_sum_head(int f, struct sum_struct *sum) +{ + sum->count = read_int(f); + sum->blength = read_int(f); + if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { + rprintf(FERROR, "[%s] Invalid block length %ld\n", + who_am_i(), (long)sum->blength); + exit_cleanup(RERR_PROTOCOL); + } + sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); + if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { + rprintf(FERROR, "[%s] Invalid checksum length %d\n", + who_am_i(), sum->s2length); + exit_cleanup(RERR_PROTOCOL); + } + sum->remainder = read_int(f); + if (sum->remainder < 0 || sum->remainder > sum->blength) { + rprintf(FERROR, "[%s] Invalid remainder length %ld\n", + who_am_i(), (long)sum->remainder); + exit_cleanup(RERR_PROTOCOL); + } +} + +/* Send the values from a sum_struct over the socket. Set sum to + * NULL if there are no checksums to send. This is called by both + * the generator and the sender. */ +void write_sum_head(int f, struct sum_struct *sum) +{ + static struct sum_struct null_sum; + + if (sum == NULL) + sum = &null_sum; + + write_int(f, sum->count); + write_int(f, sum->blength); + if (protocol_version >= 27) + write_int(f, sum->s2length); + write_int(f, sum->remainder); +} + /** * Sleep after writing to limit I/O bandwidth usage. @@ -741,81 +838,118 @@ unsigned char read_byte(int f) * 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 the generator) reading any data on msg_fd_in + * (to avoid deadlock). * * This function underlies the multiplexing system. The body of the - * application never calls this function directly. - **/ + * application never calls this function directly. */ static void writefd_unbuffered(int fd,char *buf,size_t len) { - size_t total = 0; + size_t n, total = 0; fd_set w_fds, r_fds; - int fd_count, count; + int maxfd, count, ret; struct timeval tv; - msg_list_push(NORMAL_FLUSH); - no_flush++; while (total < len) { FD_ZERO(&w_fds); FD_SET(fd,&w_fds); - fd_count = fd; + maxfd = fd; if (msg_fd_in >= 0) { FD_ZERO(&r_fds); FD_SET(msg_fd_in,&r_fds); - if (msg_fd_in > fd_count) - fd_count = msg_fd_in; + if (msg_fd_in > maxfd) + maxfd = msg_fd_in; + } + if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) { + FD_SET(sock_f_out, &w_fds); + if (sock_f_out > maxfd) + maxfd = sock_f_out; } - tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT; + tv.tv_sec = select_timeout; tv.tv_usec = 0; errno = 0; - count = select(fd_count+1, msg_fd_in >= 0 ? &r_fds : NULL, + count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL, &w_fds, NULL, &tv); - if (count == 0) { - msg_list_push(NORMAL_FLUSH); - check_timeout(); - } - if (count <= 0) { - if (errno == EBADF) { + if (count < 0 && errno == EBADF) exit_cleanup(RERR_SOCKETIO); - } + check_timeout(); continue; } if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) read_msg_fd(); - if (FD_ISSET(fd, &w_fds)) { - int ret; - size_t n = len-total; - ret = write(fd,buf+total,n); + if (!FD_ISSET(fd, &w_fds)) { + if (fd != sock_f_out && iobuf_out_cnt) { + no_flush--; + io_flush(NORMAL_FLUSH); + no_flush++; + } + continue; + } + + n = len - total; + if (bwlimit && n > bwlimit_writemax) + n = bwlimit_writemax; + ret = write(fd, buf + total, n); + if (ret <= 0) { if (ret < 0) { if (errno == EINTR) continue; @@ -825,23 +959,28 @@ static void writefd_unbuffered(int fd,char *buf,size_t len) } } - 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) { + io_timeout = select_timeout = 30; + readfd_unbuffered(sock_f_in, io_filesfrom_buf, + sizeof io_filesfrom_buf); } + exit_cleanup(RERR_STREAMIO); + } - sleep_for_bwlimit(ret); - - total += ret; + total += ret; + if (fd == sock_f_out) { if (io_timeout) last_io = time(NULL); + sleep_for_bwlimit(ret); } } @@ -849,102 +988,90 @@ static void writefd_unbuffered(int fd,char *buf,size_t len) } -static char *io_buffer; -static int io_buffer_count; - -void io_start_buffering_out(int fd) -{ - if (io_buffer) return; - multiplex_out_fd = fd; - io_buffer = new_array(char, IO_BUFFER_SIZE); - if (!io_buffer) out_of_memory("writefd"); - io_buffer_count = 0; -} - -void io_start_buffering_in(int fd) -{ - multiplex_in_fd = fd; -} - /** * Write an message to a multiplexed stream. If this fails then rsync * exits. **/ -static void mplex_write(int fd, enum msgcode code, char *buf, size_t len) +static void mplex_write(enum msgcode code, char *buf, size_t len) { char buffer[4096]; size_t n = len; SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); - if (n > (sizeof buffer - 4)) { + if (n > sizeof buffer - 4) n = sizeof buffer - 4; - } memcpy(&buffer[4], buf, n); - writefd_unbuffered(fd, buffer, n+4); + writefd_unbuffered(sock_f_out, buffer, n+4); len -= n; buf += n; - if (len) { - writefd_unbuffered(fd, buf, len); - } + if (len) + writefd_unbuffered(sock_f_out, buf, len); } void io_flush(int flush_it_all) { - int fd = multiplex_out_fd; - msg_list_push(flush_it_all); - if (!io_buffer_count || no_flush) + if (!iobuf_out_cnt || no_flush) return; if (io_multiplexing_out) - mplex_write(fd, MSG_DATA, io_buffer, io_buffer_count); + mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); else - writefd_unbuffered(fd, io_buffer, io_buffer_count); - io_buffer_count = 0; + writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); + iobuf_out_cnt = 0; } -void io_end_buffering(void) +static void writefd(int fd,char *buf,size_t len) { - io_flush(NORMAL_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; - msg_list_push(NORMAL_FLUSH); + 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) + if (iobuf_out_cnt == IO_BUFFER_SIZE) io_flush(NORMAL_FLUSH); } } +void write_short(int f, unsigned short 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]; @@ -974,8 +1101,8 @@ void write_longint(int f, int64 x) 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); @@ -991,25 +1118,26 @@ void write_buf(int f,char *buf,size_t len) writefd(f,buf,len); } + /** 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); } - /** - * 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) { @@ -1018,27 +1146,21 @@ 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; @@ -1046,43 +1168,72 @@ void io_printf(int fd, const char *format, ...) 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 a MSG_* stream with the data stream. */ -void io_start_multiplex_out(int fd) +void io_start_multiplex_out(void) { - multiplex_out_fd = fd; io_flush(NORMAL_FLUSH); - io_start_buffering_out(fd); + io_start_buffering_out(); io_multiplexing_out = 1; } /** Setup for multiplexing a MSG_* stream with the data stream. */ -void io_start_multiplex_in(int fd) +void io_start_multiplex_in(void) { - multiplex_in_fd = fd; io_flush(NORMAL_FLUSH); + io_start_buffering_in(); io_multiplexing_in = 1; } /** 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(NORMAL_FLUSH); stats.total_written += (len+4); - mplex_write(multiplex_out_fd, code, buf, len); + mplex_write(code, buf, len); return 1; } +void close_multiplexing_in(void) +{ + io_multiplexing_in = 0; +} + /** Stop output multiplexing. */ -void io_multiplexing_close(void) +void close_multiplexing_out(void) { io_multiplexing_out = 0; } +void start_write_batch(int fd) +{ + write_stream_flags(batch_fd); + + /* Some communication has already taken place, but we don't + * enable batch writing until here so that we can write a + * canonical record of the communication even though the + * actual communication so far depends on whether a daemon + * is involved. */ + write_int(batch_fd, protocol_version); + write_int(batch_fd, checksum_seed); + + if (am_sender) + write_batch_monitor_out = fd; + else + write_batch_monitor_in = fd; +} + +void stop_write_batch(void) +{ + write_batch_monitor_out = -1; + write_batch_monitor_in = -1; +}