X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/4fd842f98df4970f6e49a0365dbed60774e56c09..e4c598c830234fe3def0bae6ba45ca54071a9ee5:/io.c diff --git a/io.c b/io.c index 7edc5628..4a6b95fb 100644 --- a/io.c +++ b/io.c @@ -4,11 +4,12 @@ * Copyright (C) 1996-2001 Andrew Tridgell * Copyright (C) 1996 Paul Mackerras * Copyright (C) 2001, 2002 Martin Pool - * Copyright (C) 2003-2007 Wayne Davison + * Copyright (C) 2003-2009 Wayne Davison * * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 3 as - * published by the Free Software Foundation. + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 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 @@ -27,6 +28,8 @@ * io_start_multiplex_out() and io_start_multiplex_in(). */ #include "rsync.h" +#include "ifuncs.h" +#include "inums.h" /** If no timeout is specified then use a 60 second select timeout */ #define SELECT_TIMEOUT 60 @@ -34,75 +37,76 @@ 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 msgs2stderr; extern int inc_recurse; extern int io_error; extern int eol_nulls; extern int flist_eof; +extern int file_total; +extern int file_old_total; +extern int list_only; extern int read_batch; -extern int csum_length; +extern int protect_args; extern int checksum_seed; extern int protocol_version; extern int remove_source_files; extern int preserve_hard_links; -extern char *filesfrom_host; +extern BOOL extra_flist_sending_enabled; extern struct stats stats; -extern struct file_list *cur_flist, *first_flist; +extern struct file_list *cur_flist; #ifdef ICONV_OPTION +extern int filesfrom_convert; extern iconv_t ic_send, ic_recv; #endif -const char phase_unknown[] = "unknown"; +int csum_length = SHORT_SUM_LENGTH; /* initial value */ +int allowed_lull = 0; int ignore_timeout = 0; int batch_fd = -1; int msgdone_cnt = 0; +int forward_flist_data = 0; /* 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 iobuf_f_in = -1; -static char *iobuf_in; -static size_t iobuf_in_siz; -static size_t iobuf_in_ndx; -static size_t iobuf_in_remaining; +int64 total_data_read = 0; +int64 total_data_written = 0; -static int iobuf_f_out = -1; -static char *iobuf_out; -static int iobuf_out_cnt; +static struct { + xbuf in, out, msg; + int in_fd; + int out_fd; /* Both "out" and "msg" go to this fd. */ + BOOL in_multiplexed; + unsigned out_empty_len; + size_t raw_data_header_pos; /* in the out xbuf */ + size_t raw_flushing_ends_before; /* in the out xbuf */ + size_t raw_input_ends_before; /* in the in xbuf */ +} iobuf = { .in_fd = -1, .out_fd = -1 }; -int flist_forward_from = -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 int ff_forward_fd = -1; +static int ff_reenable_multiplex = -1; +static char ff_lastchar = '\0'; +static xbuf ff_xb = EMPTY_XBUF; #ifdef ICONV_OPTION -static char iconv_buf[sizeof io_filesfrom_buf / 2]; +static xbuf iconv_buf = EMPTY_XBUF; #endif -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 int first_message = 1; static char int_byte_extra[64] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */ @@ -111,68 +115,29 @@ static char int_byte_extra[64] = { 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */ }; -static void readfd(int fd, char *buffer, size_t N); -static void writefd(int fd, const char *buf, size_t len); -static void writefd_unbuffered(int fd, const char *buf, size_t len); -static void decrement_active_files(int ndx); -static void decrement_flist_in_progress(int ndx, int redo); -static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert); +#define IN_MULTIPLEXED (iobuf.in_multiplexed) +#define OUT_MULTIPLEXED (iobuf.out_empty_len != 0) -struct flist_ndx_item { - struct flist_ndx_item *next; - int ndx; -}; +#define PIO_NEED_INPUT (1<<0) /* The *_NEED_* flags are mutually exclusive. */ +#define PIO_NEED_OUTROOM (1<<1) +#define PIO_NEED_MSGROOM (1<<2) -struct flist_ndx_list { - struct flist_ndx_item *head, *tail; -}; +#define PIO_CONSUME_INPUT (1<<4) /* Must becombined with PIO_NEED_INPUT. */ -static struct flist_ndx_list redo_list, hlink_list; +#define PIO_INPUT_AND_CONSUME (PIO_NEED_INPUT | PIO_CONSUME_INPUT) +#define PIO_NEED_FLAGS (PIO_NEED_INPUT | PIO_NEED_OUTROOM | PIO_NEED_MSGROOM) -struct msg_list_item { - struct msg_list_item *next; - char convert; - char buf[1]; -}; +#define REMOTE_OPTION_ERROR "rsync: on remote machine: -" +#define REMOTE_OPTION_ERROR2 ": unknown option" -struct msg_list { - struct msg_list_item *head, *tail; -}; +#define FILESFROM_BUFLEN 2048 -static struct msg_list msg_queue; +enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND }; -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 flist_ndx_list redo_list, hlink_list; -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 drain_multiplex_messages(void); +static void sleep_for_bwlimit(int bytes_written); static void check_timeout(void) { @@ -197,672 +162,1097 @@ static void check_timeout(void) } } -/* 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) +/* 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 NORETURN void whine_about_eof(BOOL allow_kluge) { - sock_f_in = f_in; - sock_f_out = f_out; + if (kluge_around_eof && allow_kluge) { + 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 " + "(%s bytes received so far) [%s]\n", + big_num(stats.total_read), who_am_i()); + + exit_cleanup(RERR_STREAMIO); } -void set_io_timeout(int secs) +/* Do a safe read, handling any needed looping and error handling. + * Returns the count of the bytes read, which will only be different + * from "len" if we encountered an EOF. This routine is not used on + * the socket except very early in the transfer. */ +static size_t safe_read(int fd, char *buf, size_t len) { - io_timeout = secs; + size_t got; + int n; - if (!io_timeout || io_timeout > SELECT_TIMEOUT) - select_timeout = SELECT_TIMEOUT; - else - select_timeout = io_timeout; + assert(fd != iobuf.in_fd); - allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; -} + n = read(fd, buf, len); + if ((size_t)n == len || n == 0) { + if (DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] safe_read(%d)=%ld\n", who_am_i(), fd, (long)n); + return n; + } + if (n < 0) { + if (errno != EINTR && errno != EWOULDBLOCK && errno != EAGAIN) { + read_failed: + rsyserr(FERROR, errno, "safe_read failed to read %ld bytes [%s]", + (long)len, who_am_i()); + exit_cleanup(RERR_STREAMIO); + } + got = 0; + } else + got = n; -/* 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; + while (1) { + struct timeval tv; + fd_set r_fds, e_fds; + int cnt; + + FD_ZERO(&r_fds); + FD_SET(fd, &r_fds); + FD_ZERO(&e_fds); + FD_SET(fd, &e_fds); + tv.tv_sec = select_timeout; + tv.tv_usec = 0; + + cnt = select(fd+1, &r_fds, NULL, &e_fds, &tv); + if (cnt <= 0) { + if (cnt < 0 && errno == EBADF) { + rsyserr(FERROR, errno, "safe_read select failed [%s]", + who_am_i()); + exit_cleanup(RERR_FILEIO); + } + check_timeout(); + continue; + } + + /*if (FD_ISSET(fd, &e_fds)) + rprintf(FINFO, "select exception on fd %d\n", fd); */ + + if (FD_ISSET(fd, &r_fds)) { + n = read(fd, buf + got, len - got); + if (DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] safe_read(%d)=%ld\n", who_am_i(), fd, (long)n); + if (n == 0) + break; + if (n < 0) { + if (errno == EINTR) + continue; + goto read_failed; + } + if ((got += (size_t)n) == len) + break; + } + } + + return got; } -/* 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) +static const char *what_fd_is(int fd) { - msg_fd_out = fd; - set_nonblocking(msg_fd_out); + static char buf[20]; + + if (fd == sock_f_out) + return "socket"; + else if (fd == iobuf.out_fd) + return "message fd"; + else if (fd == batch_fd) + return "batch file"; + else { + snprintf(buf, sizeof buf, "fd %d", fd); + return buf; + } } -/* Add a message to the pending MSG_* list. */ -static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert) +/* Do a safe write, handling any needed looping and error handling. + * Returns only if everything was successfully written. This routine + * is not used on the socket except very early in the transfer. */ +static void safe_write(int fd, const char *buf, size_t 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->convert = convert; - 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; + int n; + + assert(fd != iobuf.out_fd); + + n = write(fd, buf, len); + if ((size_t)n == len) + return; + if (n < 0) { + if (errno != EINTR && errno != EWOULDBLOCK && errno != EAGAIN) { + write_failed: + rsyserr(FERROR, errno, + "safe_write failed to write %ld bytes to %s [%s]", + (long)len, what_fd_is(fd), who_am_i()); + exit_cleanup(RERR_STREAMIO); + } + } else { + buf += n; + len -= n; + } + + while (len) { + struct timeval tv; + fd_set w_fds; + int cnt; + + FD_ZERO(&w_fds); + FD_SET(fd, &w_fds); + tv.tv_sec = select_timeout; + tv.tv_usec = 0; + + cnt = select(fd + 1, NULL, &w_fds, NULL, &tv); + if (cnt <= 0) { + if (cnt < 0 && errno == EBADF) { + rsyserr(FERROR, errno, "safe_write select failed on %s [%s]", + what_fd_is(fd), who_am_i()); + exit_cleanup(RERR_FILEIO); + } + check_timeout(); + continue; + } + + if (FD_ISSET(fd, &w_fds)) { + n = write(fd, buf, len); + if (n < 0) { + if (errno == EINTR) + continue; + goto write_failed; + } + buf += n; + len -= n; + } + } } -static void msg_flush(void) +/* This is only called when files-from data is known to be available. We read + * a chunk of data and put it into the output buffer. */ +static void forward_filesfrom_data(void) { - if (am_generator) { - while (msg_queue.head && io_multiplexing_out) { - struct msg_list_item *m = msg_queue.head; - int len = IVAL(m->buf, 0) & 0xFFFFFF; - int tag = *((uchar*)m->buf+3) - MPLEX_BASE; - if (!(msg_queue.head = m->next)) - msg_queue.tail = NULL; - stats.total_written += len + 4; - defer_forwarding_messages++; - mplex_write(sock_f_out, tag, m->buf + 4, len, m->convert); - defer_forwarding_messages--; - free(m); + int len; + + len = read(ff_forward_fd, ff_xb.buf + ff_xb.len, ff_xb.size - ff_xb.len); + if (len <= 0) { + if (len == 0 || errno != EINTR) { + /* Send end-of-file marker */ + ff_forward_fd = -1; + write_buf(iobuf.out_fd, "\0\0", ff_lastchar ? 2 : 1); + free_xbuf(&ff_xb); + if (ff_reenable_multiplex >= 0) + io_start_multiplex_out(ff_reenable_multiplex); } - } else { - while (msg_queue.head) { - struct msg_list_item *m = msg_queue.head; - int len = IVAL(m->buf, 0) & 0xFFFFFF; - int tag = *((uchar*)m->buf+3) - MPLEX_BASE; - if (!(msg_queue.head = m->next)) - msg_queue.tail = NULL; - defer_forwarding_messages++; - mplex_write(msg_fd_out, tag, m->buf + 4, len, m->convert); - defer_forwarding_messages--; - free(m); + return; + } + + if (DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] files-from read=%ld\n", who_am_i(), (long)len); + +#ifdef ICONV_OPTION + len += ff_xb.len; +#endif + + if (!eol_nulls) { + char *s = ff_xb.buf + len; + /* Transform CR and/or LF into '\0' */ + while (s-- > ff_xb.buf) { + if (*s == '\n' || *s == '\r') + *s = '\0'; + } + } + + if (ff_lastchar) + ff_xb.pos = 0; + else { + char *s = ff_xb.buf; + /* Last buf ended with a '\0', so don't let this buf start with one. */ + while (len && *s == '\0') + s++, len--; + ff_xb.pos = s - ff_xb.buf; + } + +#ifdef ICONV_OPTION + if (filesfrom_convert && len) { + char *sob = ff_xb.buf + ff_xb.pos, *s = sob; + char *eob = sob + len; + int flags = ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_CIRCULAR_OUT; + if (ff_lastchar == '\0') + flags |= ICB_INIT; + /* Convert/send each null-terminated string separately, skipping empties. */ + while (s != eob) { + if (*s++ == '\0') { + ff_xb.len = s - sob - 1; + if (iconvbufs(ic_send, &ff_xb, &iobuf.out, flags) < 0) + exit_cleanup(RERR_PROTOCOL); /* impossible? */ + write_buf(iobuf.out_fd, s-1, 1); /* Send the '\0'. */ + while (s != eob && *s == '\0') + s++; + sob = s; + ff_xb.pos = sob - ff_xb.buf; + flags |= ICB_INIT; + } + } + + if ((ff_xb.len = s - sob) == 0) + ff_lastchar = '\0'; + else { + /* Handle a partial string specially, saving any incomplete chars. */ + flags &= ~ICB_INCLUDE_INCOMPLETE; + if (iconvbufs(ic_send, &ff_xb, &iobuf.out, flags) < 0) { + if (errno == E2BIG) + exit_cleanup(RERR_PROTOCOL); /* impossible? */ + if (ff_xb.pos) + memmove(ff_xb.buf, ff_xb.buf + ff_xb.pos, ff_xb.len); + } + ff_lastchar = 'x'; /* Anything non-zero. */ + } + } else +#endif + + if (len) { + char *f = ff_xb.buf + ff_xb.pos; + char *t = ff_xb.buf; + char *eob = f + len; + /* Eliminate any multi-'\0' runs. */ + while (f != eob) { + if (!(*t++ = *f++)) { + while (f != eob && *f == '\0') + f++; + } + } + ff_lastchar = f[-1]; + if ((len = t - ff_xb.buf) != 0) { + /* This will not circle back to perform_io() because we only get + * called when there is plenty of room in the output buffer. */ + write_buf(iobuf.out_fd, ff_xb.buf, len); } } } -/* 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) +/* Perform buffered input and output until specified conditions are met. When + * given a "needed" read requirement, we'll return without doing any I/O if the + * iobuf.in bytes are already available. When reading, we'll read as many + * bytes as we can into the buffer, and return as soon as we meet the minimum + * read requirement. When given a "needed" write requirement, we'll return + * without doing any I/O if that many bytes will fit in the output buffer (we + * check either iobuf.out or iobuf.msg, depending on the flags). When writing, + * we write out as much as we can, and return as soon as the given free-space + * requirement is available. + * + * The iobuf.out and iobuf.msg buffers are circular, so some writes into them + * will need to be split when the data needs to wrap around to the start. In + * order to help make this easier for some operations (such as the use of + * SIVAL() into the buffer) the buffers MUST have 4 bytes of overflow space at + * the end that is not not counted in the "size". The iobuf.in buffer is not + * (currently) circular. To facilitate the handling of MSG_DATA bytes as they + * are read-from/written-into the buffers, see the three raw_* iobuf vars. + * + * When writing, we flush data in the following priority order: + * + * 1. Finish writing any in-progress MSG_DATA sequence from iobuf.out. + * + * 2. Write out all the messages from the message buf (if iobuf.msg is active). + * Yes, this means that a PIO_NEED_OUTROOM call will completely flush any + * messages before getting to the iobuf.out flushing (except for rule 1). + * + * 3. Write out the raw data from iobuf.out, possibly filling in the multiplexed + * MSG_DATA header that was pre-allocated (when output is multiplexed). + * + * TODO: items for possible future work: + * + * - Make this routine able to read the generator-to-receiver batch flow? + * + * - Make the input buffer circular? + * + * Unlike the old routines that this replaces, it is OK to read ahead as far as + * we can because the read_a_msg() routine now reads its bytes out of the input + * buffer. In the old days, only raw data was in the input buffer, and any + * unused raw data in the buf would prevent the reading of socket data. */ +static char *perform_io(size_t needed, int flags) { - char buf[2048]; - size_t n; - struct file_list *flist; - 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(). */ - no_flush++; - msg_fd_in = -1; - defer_forwarding_messages++; - - readfd(fd, buf, 4); - tag = IVAL(buf, 0); - - len = tag & 0xFFFFFF; - tag = (tag >> 24) - MPLEX_BASE; + fd_set r_fds, e_fds, w_fds; + struct timeval tv; + int cnt, max_fd; + size_t empty_buf_len = 0; + xbuf *out; + char *data; + + if (iobuf.in.len == 0 && iobuf.in.pos != 0) { + if (iobuf.raw_input_ends_before) + iobuf.raw_input_ends_before -= iobuf.in.pos; + iobuf.in.pos = 0; + } - switch (tag) { - case MSG_DONE: - if (len < 0 || len > 1 || !am_generator) { - invalid_msg: - rprintf(FERROR, "invalid message %d:%d [%s%s]\n", - tag, len, who_am_i(), - inc_recurse ? "/inc" : ""); - exit_cleanup(RERR_STREAMIO); + switch (flags & PIO_NEED_FLAGS) { + case PIO_NEED_INPUT: + if (DEBUG_GTE(IO, 3)) { + rprintf(FINFO, "[%s] perform_io(%ld, %sinput)\n", + who_am_i(), (long)needed, flags & PIO_CONSUME_INPUT ? "consume&" : ""); } - if (len) { - readfd(fd, buf, len); - stats.total_read = read_varlong(fd, 3); + + /* Make sure the input buffer is big enough to hold "needed" bytes. + * Also make sure it will fit in the free space at the end, or + * else we need to shift some bytes. */ + if (needed && iobuf.in.size < needed) { + if (!(iobuf.in.buf = realloc_array(iobuf.in.buf, char, needed))) + out_of_memory("perform_io"); + if (DEBUG_GTE(IO, 4)) { + rprintf(FINFO, "[%s] resized input buffer from %ld to %ld bytes.\n", + who_am_i(), (long)iobuf.in.size, (long)needed); + } + iobuf.in.size = needed; } - msgdone_cnt++; - break; - case MSG_REDO: - if (len != 4 || !am_generator) - goto invalid_msg; - readfd(fd, buf, 4); - if (remove_source_files) - decrement_active_files(IVAL(buf,0)); - flist_ndx_push(&redo_list, IVAL(buf,0)); - if (inc_recurse) - decrement_flist_in_progress(IVAL(buf,0), 1); - break; - case MSG_FLIST: - if (len != 4 || !am_generator || !inc_recurse) - goto invalid_msg; - readfd(fd, buf, 4); - /* Read extra file list from receiver. */ - assert(iobuf_in != NULL); - assert(iobuf_f_in == fd); - if (verbose > 3) { - rprintf(FINFO, "[%s] receiving flist for dir %d\n", - who_am_i(), IVAL(buf,0)); + if (iobuf.in.size - iobuf.in.pos < needed + || (iobuf.in.len < needed && iobuf.in.len < 1024 + && iobuf.in.size - (iobuf.in.pos + iobuf.in.len) < 1024)) { + memmove(iobuf.in.buf, iobuf.in.buf + iobuf.in.pos, iobuf.in.len); + if (DEBUG_GTE(IO, 4)) { + rprintf(FINFO, + "[%s] moved %ld bytes from %ld to 0 in the input buffer (size=%ld, needed=%ld).\n", + who_am_i(), (long)iobuf.in.len, (long)iobuf.in.pos, (long)iobuf.in.size, (long)needed); + } + if (iobuf.raw_input_ends_before) + iobuf.raw_input_ends_before -= iobuf.in.pos; + iobuf.in.pos = 0; } - flist = recv_file_list(fd); - flist->parent_ndx = IVAL(buf,0); - break; - case MSG_FLIST_EOF: - if (len != 0 || !am_generator || !inc_recurse) - goto invalid_msg; - flist_eof = 1; break; - case MSG_DELETED: - if (len >= (int)sizeof buf || !am_generator) - goto invalid_msg; - readfd(fd, buf, len); - send_msg(MSG_DELETED, buf, len, 1); - break; - case MSG_SUCCESS: - if (len != 4 || !am_generator) - goto invalid_msg; - readfd(fd, buf, len); - if (remove_source_files) { - decrement_active_files(IVAL(buf,0)); - send_msg(MSG_SUCCESS, buf, len, 0); + + case PIO_NEED_OUTROOM: + /* We never resize the circular output buffer. */ + if (iobuf.out.size - iobuf.out_empty_len < needed) { + fprintf(stderr, "need to write %ld bytes, iobuf.out.buf is only %ld bytes.\n", + (long)needed, (long)(iobuf.out.size - iobuf.out_empty_len)); + exit_cleanup(RERR_PROTOCOL); + } + + if (DEBUG_GTE(IO, 3)) { + rprintf(FINFO, "[%s] perform_io(%ld, outroom) needs to flush %ld\n", + who_am_i(), (long)needed, + iobuf.out.len + needed > iobuf.out.size + ? (long)(iobuf.out.len + needed - iobuf.out.size) : 0L); } - if (preserve_hard_links) - flist_ndx_push(&hlink_list, IVAL(buf,0)); - if (inc_recurse) - decrement_flist_in_progress(IVAL(buf,0), 0); - break; - case MSG_NO_SEND: - if (len != 4 || !am_generator) - goto invalid_msg; - readfd(fd, buf, len); - if (inc_recurse) - decrement_flist_in_progress(IVAL(buf,0), 0); break; - case MSG_SOCKERR: - case MSG_CLIENT: - if (!am_generator) - goto invalid_msg; - if (tag == MSG_SOCKERR) - io_end_multiplex_out(); - /* FALL THROUGH */ - case MSG_INFO: - case MSG_ERROR: - case MSG_LOG: - while (len) { - n = len; - if (n >= sizeof buf) - n = sizeof buf - 1; - readfd(fd, buf, n); - rwrite((enum logcode)tag, buf, n, !am_generator); - len -= n; + + case PIO_NEED_MSGROOM: + /* We never resize the circular message buffer. */ + if (iobuf.msg.size < needed) { + fprintf(stderr, "need to write %ld bytes, iobuf.msg.buf is only %ld bytes.\n", + (long)needed, (long)iobuf.msg.size); + exit_cleanup(RERR_PROTOCOL); + } + + if (DEBUG_GTE(IO, 3)) { + rprintf(FINFO, "[%s] perform_io(%ld, msgroom) needs to flush %ld\n", + who_am_i(), (long)needed, + iobuf.msg.len + needed > iobuf.msg.size + ? (long)(iobuf.msg.len + needed - iobuf.msg.size) : 0L); } break; + + case 0: + if (DEBUG_GTE(IO, 3)) + rprintf(FINFO, "[%s] perform_io(%ld, %d)\n", who_am_i(), (long)needed, flags); + break; + default: - rprintf(FERROR, "unknown message %d:%d [%s]\n", - tag, len, who_am_i()); - exit_cleanup(RERR_STREAMIO); + exit_cleanup(RERR_UNSUPPORTED); } - no_flush--; - msg_fd_in = fd; - if (!--defer_forwarding_messages) - msg_flush(); -} + while (1) { + switch (flags & PIO_NEED_FLAGS) { + case PIO_NEED_INPUT: + if (iobuf.in.len >= needed) + goto double_break; + break; + case PIO_NEED_OUTROOM: + /* Note that iobuf.out_empty_len doesn't factor into this check + * because iobuf.out.len already holds any needed header len. */ + if (iobuf.out.len + needed <= iobuf.out.size) + goto double_break; + break; + case PIO_NEED_MSGROOM: + if (iobuf.msg.len + needed <= iobuf.msg.size) + goto double_break; + break; + } -/* This is used by the generator to limit how many file transfers can - * be active at once when --remove-source-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)) { - check_for_finished_files(itemizing, code, 0); - if (iobuf_out_cnt) - io_flush(NORMAL_FLUSH); - else - read_msg_fd(); - } + max_fd = -1; - active_filecnt++; - active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]); -} + FD_ZERO(&r_fds); + FD_ZERO(&e_fds); + if (iobuf.in_fd >= 0 && iobuf.in.size - (iobuf.in.pos + iobuf.in.len)) { + if (!read_batch || batch_fd >= 0) { + FD_SET(iobuf.in_fd, &r_fds); + FD_SET(iobuf.in_fd, &e_fds); + } + if (iobuf.in_fd > max_fd) + max_fd = iobuf.in_fd; + } -static void decrement_active_files(int ndx) -{ - struct file_list *flist = flist_for_ndx(ndx); - assert(flist != NULL); - active_filecnt--; - active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); -} + /* Only do more filesfrom processing if there is enough room in the out buffer. */ + if (ff_forward_fd >= 0 && iobuf.out.size - iobuf.out.len > FILESFROM_BUFLEN*2) { + FD_SET(ff_forward_fd, &r_fds); + if (ff_forward_fd > max_fd) + max_fd = ff_forward_fd; + } -static void decrement_flist_in_progress(int ndx, int redo) -{ - struct file_list *flist = cur_flist ? cur_flist : first_flist; + FD_ZERO(&w_fds); + if (iobuf.out_fd >= 0) { + if (iobuf.raw_flushing_ends_before + || (!iobuf.msg.len && iobuf.out.len > iobuf.out_empty_len && !(flags & PIO_NEED_MSGROOM))) { + if (OUT_MULTIPLEXED && !iobuf.raw_flushing_ends_before) { + /* The iobuf.raw_flushing_ends_before value can point off the end + * of the iobuf.out buffer for a while, for easier subtracting. */ + iobuf.raw_flushing_ends_before = iobuf.out.pos + iobuf.out.len; + + SIVAL(iobuf.out.buf + iobuf.raw_data_header_pos, 0, + ((MPLEX_BASE + (int)MSG_DATA)<<24) + iobuf.out.len - 4); + if (iobuf.raw_data_header_pos + 4 > iobuf.out.size) { + int siz = (int)(iobuf.raw_data_header_pos + 4 - iobuf.out.size); + /* We used some of the overflow bytes, so move them. */ + if (DEBUG_GTE(IO, 4)) { + rprintf(FINFO, "[%s] wrap-bytes moved: %d (perform_io)\n", + who_am_i(), siz); + } + memcpy(iobuf.out.buf, iobuf.out.buf + iobuf.out.size, siz); + } - while (ndx < flist->ndx_start) { - if (flist == first_flist) { - invalid_ndx: - rprintf(FERROR, - "Invalid file index: %d (%d - %d) [%s]\n", - ndx, first_flist->ndx_start, - first_flist->prev->ndx_start + first_flist->prev->count - 1, - who_am_i()); - exit_cleanup(RERR_PROTOCOL); + if (DEBUG_GTE(IO, 1)) { + rprintf(FINFO, "[%s] send_msg(%d, %ld)\n", + who_am_i(), (int)MSG_DATA, (long)iobuf.out.len - 4); + } + + /* reserve room for the next MSG_DATA header */ + iobuf.raw_data_header_pos = iobuf.raw_flushing_ends_before; + if (iobuf.raw_data_header_pos >= iobuf.out.size) + iobuf.raw_data_header_pos -= iobuf.out.size; + /* Yes, it is possible for this to make len > size for a while. */ + iobuf.out.len += 4; + } + + empty_buf_len = iobuf.out_empty_len; + out = &iobuf.out; + } else if (iobuf.msg.len) { + empty_buf_len = 0; + out = &iobuf.msg; + } else + out = NULL; + if (out) { + FD_SET(iobuf.out_fd, &w_fds); + if (iobuf.out_fd > max_fd) + max_fd = iobuf.out_fd; + } + } else + out = NULL; + + if (max_fd < 0) { + switch (flags & PIO_NEED_FLAGS) { + case PIO_NEED_INPUT: + iobuf.in.len = 0; + if (kluge_around_eof == 2) + exit_cleanup(0); + if (iobuf.in_fd == -2) + whine_about_eof(True); + rprintf(FERROR, "error in perform_io: no fd for input.\n"); + exit_cleanup(RERR_PROTOCOL); + case PIO_NEED_OUTROOM: + case PIO_NEED_MSGROOM: + msgs2stderr = 1; + drain_multiplex_messages(); + if (iobuf.out_fd == -2) + whine_about_eof(True); + rprintf(FERROR, "error in perform_io: no fd for output.\n"); + exit_cleanup(RERR_PROTOCOL); + default: + /* No stated needs, so I guess this is OK. */ + break; + } + break; + } + + if (extra_flist_sending_enabled) { + if (file_total - file_old_total < MAX_FILECNT_LOOKAHEAD) + tv.tv_sec = 0; + else { + extra_flist_sending_enabled = False; + tv.tv_sec = select_timeout; + } + } else + tv.tv_sec = select_timeout; + tv.tv_usec = 0; + + cnt = select(max_fd + 1, &r_fds, &w_fds, &e_fds, &tv); + + if (cnt <= 0) { + if (cnt < 0 && errno == EBADF) { + msgs2stderr = 1; + exit_cleanup(RERR_SOCKETIO); + } + if (extra_flist_sending_enabled) { + extra_flist_sending_enabled = False; + send_extra_file_list(sock_f_out, -1); + extra_flist_sending_enabled = !flist_eof; + } else + check_timeout(); + FD_ZERO(&r_fds); /* Just in case... */ + FD_ZERO(&w_fds); + } + + if (iobuf.in_fd >= 0 && FD_ISSET(iobuf.in_fd, &r_fds)) { + size_t pos = iobuf.in.pos + iobuf.in.len; + size_t len = iobuf.in.size - pos; + int n; + if ((n = read(iobuf.in_fd, iobuf.in.buf + pos, len)) <= 0) { + if (n == 0) { + /* Signal that input has become invalid. */ + if (!read_batch || batch_fd < 0 || am_generator) + iobuf.in_fd = -2; + batch_fd = -1; + continue; + } + if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) + n = 0; + else { + /* Don't write errors on a dead socket. */ + if (iobuf.in_fd == sock_f_in) { + if (am_sender) + msgs2stderr = 1; + rsyserr(FERROR_SOCKET, errno, "read error"); + } else + rsyserr(FERROR, errno, "read error"); + exit_cleanup(RERR_SOCKETIO); + } + } + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] recv=%ld\n", who_am_i(), (long)n); + + if (io_timeout) + last_io_in = time(NULL); + stats.total_read += n; + + iobuf.in.len += n; + } + + if (iobuf.out_fd >= 0 && FD_ISSET(iobuf.out_fd, &w_fds)) { + size_t len = iobuf.raw_flushing_ends_before ? iobuf.raw_flushing_ends_before - out->pos : out->len; + int n; + + if (bwlimit_writemax && len > bwlimit_writemax) + len = bwlimit_writemax; + + if (out->pos + len > out->size) + len = out->size - out->pos; + if ((n = write(iobuf.out_fd, out->buf + out->pos, len)) <= 0) { + if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) + n = 0; + else { + /* Don't write errors on a dead socket. */ + msgs2stderr = 1; + iobuf.out_fd = -2; + iobuf.out.len = iobuf.msg.len = iobuf.raw_flushing_ends_before = 0; + rsyserr(FERROR_SOCKET, errno, "[%s] write error", who_am_i()); + drain_multiplex_messages(); + exit_cleanup(RERR_SOCKETIO); + } + } + if (msgs2stderr && DEBUG_GTE(IO, 2)) { + rprintf(FINFO, "[%s] %s sent=%ld\n", + who_am_i(), out == &iobuf.out ? "out" : "msg", (long)n); + } + + if (io_timeout) + last_io_out = time(NULL); + stats.total_written += n; + + if (bwlimit_writemax) + sleep_for_bwlimit(n); + + if ((out->pos += n) == out->size) { + if (iobuf.raw_flushing_ends_before) + iobuf.raw_flushing_ends_before -= out->size; + out->pos = 0; + } else if (out->pos == iobuf.raw_flushing_ends_before) + iobuf.raw_flushing_ends_before = 0; + if ((out->len -= n) == empty_buf_len) { + out->pos = 0; + if (empty_buf_len) + iobuf.raw_data_header_pos = 0; + } + } + + if (ff_forward_fd >= 0 && FD_ISSET(ff_forward_fd, &r_fds)) { + /* This can potentially flush all output and enable + * multiplexed output, so keep this last in the loop + * and be sure to not cache anything that would break + * such a change. */ + forward_filesfrom_data(); } - flist = flist->prev; } - while (ndx >= flist->ndx_start + flist->count) { - if (!(flist = flist->next)) - goto invalid_ndx; + double_break: + + data = iobuf.in.buf + iobuf.in.pos; + + if (flags & PIO_CONSUME_INPUT) { + iobuf.in.len -= needed; + iobuf.in.pos += needed; } - flist->in_progress--; - if (redo) - flist->to_redo++; + return data; } -/* Write an message to a multiplexed stream. If this fails, rsync exits. */ -static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert) +void noop_io_until_death(void) { - char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */ - size_t n = len; + char buf[1024]; - SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); + kluge_around_eof = 2; + /* Setting an I/O timeout ensures that if something inexplicably weird + * happens, we won't hang around forever. */ + if (!io_timeout) + set_io_timeout(60); + + while (1) + read_buf(iobuf.in_fd, buf, sizeof buf); +} + +/* Buffer a message for the multiplexed output stream. Is never used for MSG_DATA. */ +int send_msg(enum msgcode code, const char *buf, size_t len, int convert) +{ + char *hdr; + size_t pos; + BOOL want_debug = DEBUG_GTE(IO, 1) && convert >= 0 && (msgs2stderr || code != MSG_INFO); + + if (!OUT_MULTIPLEXED) + return 0; + + if (want_debug) + rprintf(FINFO, "[%s] send_msg(%d, %ld)\n", who_am_i(), (int)code, (long)len); #ifdef ICONV_OPTION - if (convert && ic_send == (iconv_t)-1) -#endif + if (convert > 0 && ic_send == (iconv_t)-1) convert = 0; + if (convert > 0) { + /* Ensuring double-size room leaves space for maximal conversion expansion. */ + if (iobuf.msg.len + len*2 + 4 > iobuf.msg.size) + perform_io(len*2 + 4, PIO_NEED_MSGROOM); + } else +#endif + if (iobuf.msg.len + len + 4 > iobuf.msg.size) + perform_io(len + 4, PIO_NEED_MSGROOM); - if (convert || n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */ - n = 0; - else - memcpy(buffer + 4, buf, n); - - writefd_unbuffered(fd, buffer, n+4); + pos = iobuf.msg.pos + iobuf.msg.len; /* Must be set after any flushing. */ + if (pos >= iobuf.msg.size) + pos -= iobuf.msg.size; + hdr = iobuf.msg.buf + pos; - len -= n; - buf += n; + iobuf.msg.len += 4; /* Allocate room for the coming header bytes. */ #ifdef ICONV_OPTION - if (convert) { - iconv(ic_send, NULL, 0, NULL, 0); - defer_forwarding_messages++; - while (len) { - ICONV_CONST char *ibuf = (ICONV_CONST char *)buf; - char *obuf = buffer; - size_t ocnt = sizeof buffer; - while (len && iconv(ic_send, &ibuf,&len, - &obuf,&ocnt) == (size_t)-1) { - if (errno == E2BIG || !ocnt) - break; - *obuf++ = *ibuf++; - ocnt--, len--; - } - n = obuf - buffer; - writefd_unbuffered(fd, buffer, n); + if (convert > 0) { + xbuf inbuf; + + INIT_XBUF(inbuf, (char*)buf, len, (size_t)-1); + + len = iobuf.msg.len; + iconvbufs(ic_send, &inbuf, &iobuf.msg, + ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_CIRCULAR_OUT | ICB_INIT); + if (inbuf.len > 0) { + rprintf(FERROR, "overflowed iobuf.msg buffer in send_msg"); + exit_cleanup(RERR_UNSUPPORTED); } - if (!--defer_forwarding_messages) - msg_flush(); + len = iobuf.msg.len - len; } else #endif - if (len) { - defer_forwarding_messages++; - writefd_unbuffered(fd, buf, len); - if (!--defer_forwarding_messages) - msg_flush(); + { + size_t siz; + + if ((pos += 4) >= iobuf.msg.size) + pos -= iobuf.msg.size; + + /* Handle a split copy if we wrap around the end of the circular buffer. */ + if (pos >= iobuf.msg.pos && (siz = iobuf.msg.size - pos) < len) { + memcpy(iobuf.msg.buf + pos, buf, siz); + memcpy(iobuf.msg.buf, buf + siz, len - siz); + } else + memcpy(iobuf.msg.buf + pos, buf, len); + + iobuf.msg.len += len; } -} -int send_msg(enum msgcode code, const char *buf, int len, int convert) -{ - if (msg_fd_out < 0) { - if (!defer_forwarding_messages) - return io_multiplex_write(code, buf, len, convert); - if (!io_multiplexing_out) - return 0; - msg_list_add(&msg_queue, code, buf, len, convert); - return 1; + SIVAL(hdr, 0, ((MPLEX_BASE + (int)code)<<24) + len); + /* If the header used any overflow bytes, move them to the start. */ + if ((pos = hdr+4 - iobuf.msg.buf) > iobuf.msg.size) { + int siz = (int)(pos - iobuf.msg.size); + if (DEBUG_GTE(IO, 4)) + rprintf(FINFO, "[%s] wrap-bytes moved: %d (send_msg)\n", who_am_i(), siz); + memcpy(iobuf.msg.buf, iobuf.msg.buf + iobuf.msg.size, siz); } - if (flist_forward_from >= 0) - msg_list_add(&msg_queue, code, buf, len, convert); - else - mplex_write(msg_fd_out, code, buf, len, convert); + + if (want_debug && convert > 0) + rprintf(FINFO, "[%s] converted msg len=%ld\n", who_am_i(), (long)len); + return 1; } void send_msg_int(enum msgcode code, int num) { char numbuf[4]; + + if (DEBUG_GTE(IO, 1)) + rprintf(FINFO, "[%s] send_msg_int(%d, %d)\n", who_am_i(), (int)code, num); + SIVAL(numbuf, 0, num); - send_msg(code, numbuf, 4, 0); + send_msg(code, numbuf, 4, -1); } -void wait_for_receiver(void) +static void got_flist_entry_status(enum festatus status, int ndx) { - if (iobuf_out_cnt) - io_flush(NORMAL_FLUSH); - else - read_msg_fd(); -} + struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status"); -int get_redo_num(void) -{ - return flist_ndx_pop(&redo_list); -} + if (remove_source_files) { + active_filecnt--; + active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); + } -int get_hlink_num(void) -{ - return flist_ndx_pop(&hlink_list); + if (inc_recurse) + flist->in_progress--; + + switch (status) { + case FES_SUCCESS: + if (remove_source_files) + send_msg_int(MSG_SUCCESS, ndx); + if (preserve_hard_links) { + struct file_struct *file = flist->files[ndx - flist->ndx_start]; + if (F_IS_HLINKED(file)) { + flist_ndx_push(&hlink_list, ndx); + flist->in_progress++; + } + } + break; + case FES_REDO: + if (read_batch) { + if (inc_recurse) + flist->in_progress++; + break; + } + if (inc_recurse) + flist->to_redo++; + flist_ndx_push(&redo_list, ndx); + break; + case FES_NO_SEND: + break; + } } -/** - * 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) +/* 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) { - 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; + sock_f_in = f_in; + sock_f_out = f_out; } -/* 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) +void set_io_timeout(int secs) { - 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); - } + io_timeout = secs; - rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " - "(%.0f bytes received so far) [%s]\n", - (double)stats.total_read, who_am_i()); + if (!io_timeout || io_timeout > SELECT_TIMEOUT) + select_timeout = SELECT_TIMEOUT; + else + select_timeout = io_timeout; - exit_cleanup(RERR_STREAMIO); + allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; } -/** - * 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) +static void check_for_d_option_error(const char *msg) { - int n, cnt = 0; + static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz"; + char *colon; + int saw_d = 0; - io_flush(FULL_FLUSH); + if (*msg != 'r' + || strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0) + return; - while (cnt == 0) { - /* until we manage to read *something* */ - fd_set r_fds, w_fds; - struct timeval tv; - int maxfd = fd; - int count; + msg += sizeof REMOTE_OPTION_ERROR - 1; + if (*msg == '-' || (colon = strchr(msg, ':')) == NULL + || strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0) + return; - FD_ZERO(&r_fds); - FD_ZERO(&w_fds); - FD_SET(fd, &r_fds); - 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; - } + for ( ; *msg != ':'; msg++) { + if (*msg == 'd') + saw_d = 1; + else if (*msg == 'e') + break; + else if (strchr(rsync263_opts, *msg) == NULL) + return; + } - tv.tv_sec = select_timeout; - tv.tv_usec = 0; + if (saw_d) { + rprintf(FWARNING, + "*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n"); + } +} - errno = 0; +/* This is used by the generator to limit how many file transfers can + * be active at once when --remove-source-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) +{ + while (1) { + /* TODO: tune these limits? */ + int limit = active_bytecnt >= 128*1024 ? 10 : 50; + if (active_filecnt < limit) + break; + check_for_finished_files(itemizing, code, 0); + if (active_filecnt < limit) + break; + wait_for_receiver(); + } - count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); + active_filecnt++; + active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]); +} - if (count <= 0) { - if (errno == EBADF) { - defer_forwarding_messages = 0; - exit_cleanup(RERR_SOCKETIO); - } - check_timeout(); - continue; - } +int get_redo_num(void) +{ + return flist_ndx_pop(&redo_list); +} - 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 if (errno != EINTR) { - /* 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) { - if (l == 0 || errno != EINTR) { - /* 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; - } - } - } - } +int get_hlink_num(void) +{ + return flist_ndx_pop(&hlink_list); +} - if (!FD_ISSET(fd, &r_fds)) - continue; +/* 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 making recv_file_list() call forward_filesfrom_data(), which + * will ensure that we forward data to the sender until we get some data + * for recv_file_list() to use. */ +void start_filesfrom_forwarding(int fd) +{ + if (protocol_version < 31 && OUT_MULTIPLEXED) { + /* Older protocols send the files-from data w/o packaging + * it in multiplexed I/O packets, so temporarily switch + * to buffered I/O to match this behavior. */ + iobuf.msg.pos = iobuf.msg.len = 0; /* Be extra sure no messages go out. */ + ff_reenable_multiplex = io_end_multiplex_out(MPLX_TO_BUFFERED); + } + ff_forward_fd = fd; - n = read(fd, buf, len); + alloc_xbuf(&ff_xb, FILESFROM_BUFLEN); +} - if (n <= 0) { - if (n == 0) - whine_about_eof(fd); /* Doesn't return. */ - if (errno == EINTR || errno == EWOULDBLOCK - || errno == EAGAIN) - continue; +/* Read a line into the "buf" buffer. */ +int read_line(int fd, char *buf, size_t bufsiz, int flags) +{ + char ch, *s, *eob; - /* Don't write errors on a dead socket. */ - if (fd == sock_f_in) { - io_end_multiplex_out(); - rsyserr(FSOCKERR, errno, "read error"); - } else - rsyserr(FERROR, errno, "read error"); - exit_cleanup(RERR_STREAMIO); +#ifdef ICONV_OPTION + if (flags & RL_CONVERT && iconv_buf.size < bufsiz) + realloc_xbuf(&iconv_buf, bufsiz + 1024); +#endif + + start: +#ifdef ICONV_OPTION + s = flags & RL_CONVERT ? iconv_buf.buf : buf; +#else + s = buf; +#endif + eob = s + bufsiz - 1; + while (1) { + /* We avoid read_byte() for files because files can return an EOF. */ + if (fd == iobuf.in_fd) + ch = read_byte(fd); + else if (safe_read(fd, &ch, 1) == 0) + break; + if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) { + /* Skip empty lines if dumping comments. */ + if (flags & RL_DUMP_COMMENTS && s == buf) + continue; + break; } + if (s < eob) + *s++ = ch; + } + *s = '\0'; - buf += n; - len -= n; - cnt += n; + if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';')) + goto start; - if (fd == sock_f_in && io_timeout) - last_io_in = time(NULL); +#ifdef ICONV_OPTION + if (flags & RL_CONVERT) { + xbuf outbuf; + INIT_XBUF(outbuf, buf, 0, bufsiz); + iconv_buf.pos = 0; + iconv_buf.len = s - iconv_buf.buf; + iconvbufs(ic_recv, &iconv_buf, &outbuf, + ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT); + outbuf.buf[outbuf.len] = '\0'; + return outbuf.len; } +#endif - return cnt; + return s - buf; } -/* Read a line into the "fname" buffer (which must be at least MAXPATHLEN - * characters long). */ -int read_filesfrom_line(int fd, char *fname) +void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls, + char ***argv_p, int *argc_p, char **request_p) { - char ch, *s, *eob = fname + MAXPATHLEN - 1; - int cnt; - int reading_remotely = filesfrom_host != NULL; - int nulls = eol_nulls || reading_remotely; + int maxargs = MAX_ARGS; + int dot_pos = 0; + int argc = 0; + char **argv, *p; + int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0); + +#ifdef ICONV_OPTION + rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0); +#endif + + if (!(argv = new_array(char *, maxargs))) + out_of_memory("read_args"); + if (mod_name && !protect_args) + argv[argc++] = "rsyncd"; - start: - s = fname; while (1) { - cnt = read(fd, &ch, 1); - if (cnt < 0 && (errno == EWOULDBLOCK - || errno == EINTR || errno == EAGAIN)) { - struct timeval tv; - fd_set r_fds, e_fds; - FD_ZERO(&r_fds); - FD_SET(fd, &r_fds); - FD_ZERO(&e_fds); - FD_SET(fd, &e_fds); - tv.tv_sec = select_timeout; - tv.tv_usec = 0; - if (!select(fd+1, &r_fds, NULL, &e_fds, &tv)) - check_timeout(); - if (FD_ISSET(fd, &e_fds)) { - rsyserr(FINFO, errno, - "select exception on fd %d", fd); - } - continue; - } - if (cnt != 1) - break; - if (nulls? !ch : (ch == '\r' || ch == '\n')) { - /* Skip empty lines if reading locally. */ - if (!reading_remotely && s == fname) - continue; + if (read_line(f_in, buf, bufsiz, rl_flags) == 0) break; + + if (argc == maxargs-1) { + maxargs += MAX_ARGS; + if (!(argv = realloc_array(argv, char *, maxargs))) + out_of_memory("read_args"); + } + + if (dot_pos) { + if (request_p) { + *request_p = strdup(buf); + request_p = NULL; + } + if (mod_name) + glob_expand_module(mod_name, buf, &argv, &argc, &maxargs); + else + glob_expand(buf, &argv, &argc, &maxargs); + } else { + if (!(p = strdup(buf))) + out_of_memory("read_args"); + argv[argc++] = p; + if (*p == '.' && p[1] == '\0') + dot_pos = argc; } - if (s < eob) - *s++ = ch; } - *s = '\0'; + argv[argc] = NULL; - /* Dump comments. */ - if (*fname == '#' || *fname == ';') - goto start; + glob_expand(NULL, NULL, NULL, NULL); - return s - fname; + *argc_p = argc; + *argv_p = argv; } -int io_start_buffering_out(int f_out) +BOOL io_start_buffering_out(int f_out) { - if (iobuf_out) { - assert(f_out == iobuf_f_out); - return 0; + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] io_start_buffering_out(%d)\n", who_am_i(), f_out); + + if (OUT_MULTIPLEXED && !iobuf.msg.buf) { + iobuf.msg.size = IO_BUFFER_SIZE - 4; + if (!(iobuf.msg.buf = new_array(char, iobuf.msg.size + 4))) + out_of_memory("io_start_buffering_out"); + iobuf.msg.pos = iobuf.msg.len = 0; + } + + if (iobuf.out.buf) { + if (iobuf.out_fd == -1) + iobuf.out_fd = f_out; + else + assert(f_out == iobuf.out_fd); + return False; } - if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) + + iobuf.out.size = IO_BUFFER_SIZE * 2 - 4; + /* The 4 overflow bytes makes some circular-buffer wrapping operations easier. */ + if (!(iobuf.out.buf = new_array(char, iobuf.out.size + 4))) out_of_memory("io_start_buffering_out"); - iobuf_out_cnt = 0; - iobuf_f_out = f_out; - return 1; + iobuf.out.pos = iobuf.out.len = 0; + iobuf.out_fd = f_out; + + return True; } -int io_start_buffering_in(int f_in) +BOOL io_start_buffering_in(int f_in) { - if (iobuf_in) { - assert(f_in == iobuf_f_in); - return 0; + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] io_start_buffering_in(%d)\n", who_am_i(), f_in); + + if (iobuf.in.buf) { + if (iobuf.in_fd == -1) + iobuf.in_fd = f_in; + else + assert(f_in == iobuf.in_fd); + return False; } - iobuf_in_siz = 2 * IO_BUFFER_SIZE; - if (!(iobuf_in = new_array(char, iobuf_in_siz))) + + iobuf.in.size = IO_BUFFER_SIZE; + if (!(iobuf.in.buf = new_array(char, iobuf.in.size))) out_of_memory("io_start_buffering_in"); - iobuf_f_in = f_in; - return 1; + + iobuf.in.pos = iobuf.in.len = 0; + + iobuf.in_fd = f_in; + + return True; } -void io_end_buffering_in(void) +void io_end_buffering_in(BOOL free_buffers) { - if (!iobuf_in) - return; - free(iobuf_in); - iobuf_in = NULL; - iobuf_in_ndx = 0; - iobuf_in_remaining = 0; - iobuf_f_in = -1; + if (msgs2stderr && DEBUG_GTE(IO, 2)) { + rprintf(FINFO, "[%s] io_end_buffering_in(IOBUF_%s_BUFS)\n", + who_am_i(), free_buffers ? "FREE" : "KEEP"); + } + + if (free_buffers) + free_xbuf(&iobuf.in); + else + iobuf.in.pos = iobuf.in.len = 0; + + iobuf.in_fd = -1; } -void io_end_buffering_out(void) +void io_end_buffering_out(BOOL free_buffers) { - if (!iobuf_out) - return; + if (msgs2stderr && DEBUG_GTE(IO, 2)) { + rprintf(FINFO, "[%s] io_end_buffering_out(IOBUF_%s_BUFS)\n", + who_am_i(), free_buffers ? "FREE" : "KEEP"); + } + io_flush(FULL_FLUSH); - free(iobuf_out); - iobuf_out = NULL; - iobuf_f_out = -1; + + if (free_buffers) { + free_xbuf(&iobuf.out); + free_xbuf(&iobuf.msg); + } + + iobuf.out_fd = -1; } void maybe_flush_socket(int important) { - if (iobuf_out && iobuf_out_cnt + if (flist_eof && iobuf.out.buf && iobuf.out.len > iobuf.out_empty_len && (important || time(NULL) - last_io_out >= 5)) io_flush(NORMAL_FLUSH); } @@ -870,210 +1260,288 @@ void maybe_flush_socket(int important) void maybe_send_keepalive(void) { if (time(NULL) - last_io_out >= allowed_lull) { - if (!iobuf_out || !iobuf_out_cnt) { + if (!iobuf.msg.len && iobuf.out.len == iobuf.out_empty_len) { if (protocol_version < 29) return; /* there's nothing we can do */ if (protocol_version >= 30) send_msg(MSG_NOOP, "", 0, 0); else { - write_int(sock_f_out, cur_flist->count); - write_shortint(sock_f_out, ITEM_IS_NEW); + write_int(iobuf.out_fd, cur_flist->used); + write_shortint(iobuf.out_fd, ITEM_IS_NEW); } } - if (iobuf_out) + if (iobuf.msg.len) + perform_io(iobuf.msg.size - iobuf.msg.len + 1, PIO_NEED_MSGROOM); + else if (iobuf.out.len > iobuf.out_empty_len) io_flush(NORMAL_FLUSH); } } -void start_flist_forward(int f_in) -{ - assert(iobuf_out != NULL); - assert(iobuf_f_out == msg_fd_out); - flist_forward_from = f_in; -} - -void stop_flist_forward() +void start_flist_forward(int ndx) { - flist_forward_from = -1; - io_flush(FULL_FLUSH); + write_int(iobuf.out_fd, ndx); + forward_flist_data = 1; } -/** - * 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) +void stop_flist_forward(void) { - while (len) { - int n = read_timeout(fd, buf, len); - - buf += n; - len -= n; - } + forward_flist_data = 0; } -/** - * 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) +/* Read a message from a multiplexed source. */ +static void read_a_msg(void) { + char *data, line[BIGPATHBUFLEN]; + int tag, val; size_t msg_bytes; - int tag, cnt = 0; - char line[BIGPATHBUFLEN]; - - if (!iobuf_in || fd != iobuf_f_in) - return read_timeout(fd, buf, len); - - if (!io_multiplexing_in && iobuf_in_remaining == 0) { - iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); - iobuf_in_ndx = 0; - } - while (cnt == 0) { - if (iobuf_in_remaining) { - len = MIN(len, iobuf_in_remaining); - memcpy(buf, iobuf_in + iobuf_in_ndx, len); - iobuf_in_ndx += len; - iobuf_in_remaining -= len; - cnt = len; - break; - } + data = perform_io(4, PIO_INPUT_AND_CONSUME); + tag = IVAL(data, 0); - read_loop(fd, line, 4); - tag = IVAL(line, 0); + msg_bytes = tag & 0xFFFFFF; + tag = (tag >> 24) - MPLEX_BASE; - msg_bytes = tag & 0xFFFFFF; - tag = (tag >> 24) - MPLEX_BASE; + if (DEBUG_GTE(IO, 1) && (msgs2stderr || tag != MSG_INFO)) + rprintf(FINFO, "[%s] got msg=%d, len=%ld\n", who_am_i(), (int)tag, (long)msg_bytes); - 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); - iobuf_in_remaining = msg_bytes; - iobuf_in_ndx = 0; - break; - case MSG_NOOP: - if (am_sender) - maybe_send_keepalive(); - break; - case MSG_IO_ERROR: - if (msg_bytes != 4) - goto invalid_msg; - read_loop(fd, line, msg_bytes); - io_error |= IVAL(line, 0); + switch (tag) { + case MSG_DATA: + assert(iobuf.raw_input_ends_before == 0); + /* Though this does not yet read the data, we do mark where in + * the buffer the msg data will end once it is read. It is + * possible that this points off the end of the buffer, in + * which case the gradual reading of the input stream will + * cause this value to decrease and eventually become real. */ + iobuf.raw_input_ends_before = iobuf.in.pos + msg_bytes; + break; + case MSG_STATS: + if (msg_bytes != sizeof stats.total_read || !am_generator) + goto invalid_msg; + data = perform_io(sizeof stats.total_read, PIO_INPUT_AND_CONSUME); + memcpy((char*)&stats.total_read, data, sizeof stats.total_read); + break; + case MSG_REDO: + if (msg_bytes != 4 || !am_generator) + goto invalid_msg; + data = perform_io(4, PIO_INPUT_AND_CONSUME); + got_flist_entry_status(FES_REDO, IVAL(data, 0)); + break; + case MSG_IO_ERROR: + if (msg_bytes != 4 || am_sender) + goto invalid_msg; + data = perform_io(4, PIO_INPUT_AND_CONSUME); + val = IVAL(data, 0); + io_error |= val; + if (!am_generator) + send_msg_int(MSG_IO_ERROR, val); + break; + case MSG_IO_TIMEOUT: + if (msg_bytes != 4 || am_server || am_generator) + goto invalid_msg; + data = perform_io(4, PIO_INPUT_AND_CONSUME); + val = IVAL(data, 0); + if (!io_timeout || io_timeout > val) { + if (INFO_GTE(MISC, 2)) + rprintf(FINFO, "Setting --timeout=%d to match server\n", val); + set_io_timeout(val); + } + break; + case MSG_NOOP: + if (am_sender) + maybe_send_keepalive(); + break; + case MSG_DELETED: + if (msg_bytes >= sizeof line) + goto overflow; + if (am_generator) { + memcpy(line, perform_io(msg_bytes, PIO_INPUT_AND_CONSUME), msg_bytes); + send_msg(MSG_DELETED, line, msg_bytes, 1); break; - case MSG_DELETED: - if (msg_bytes >= sizeof line) - goto overflow; + } #ifdef ICONV_OPTION - if (ic_recv != (iconv_t)-1) { - ICONV_CONST char *ibuf; - char *obuf = line; - size_t icnt, ocnt = sizeof line - 1; - int add_null = 0; - iconv(ic_send, NULL, 0, NULL, 0); - while (msg_bytes) { - icnt = msg_bytes > sizeof iconv_buf - ? sizeof iconv_buf : msg_bytes; - read_loop(fd, iconv_buf, icnt); - if (!(msg_bytes -= icnt) && !iconv_buf[icnt-1]) - icnt--, add_null = 1; - ibuf = (ICONV_CONST char *)iconv_buf; - if (iconv(ic_send, &ibuf,&icnt, - &obuf,&ocnt) == (size_t)-1) - goto overflow; // XXX + if (ic_recv != (iconv_t)-1) { + xbuf outbuf, inbuf; + char ibuf[512]; + int add_null = 0; + int flags = ICB_INCLUDE_BAD | ICB_INIT; + + INIT_CONST_XBUF(outbuf, line); + INIT_XBUF(inbuf, ibuf, 0, (size_t)-1); + + while (msg_bytes) { + size_t len = msg_bytes > sizeof ibuf - inbuf.len ? sizeof ibuf - inbuf.len : msg_bytes; + memcpy(ibuf + inbuf.len, perform_io(len, PIO_INPUT_AND_CONSUME), len); + inbuf.pos = 0; + inbuf.len += len; + if (!(msg_bytes -= len) && !ibuf[inbuf.len-1]) + inbuf.len--, add_null = 1; + if (iconvbufs(ic_send, &inbuf, &outbuf, flags) < 0) { + if (errno == E2BIG) + goto overflow; + /* Buffer ended with an incomplete char, so move the + * bytes to the start of the buffer and continue. */ + memmove(ibuf, ibuf + inbuf.pos, inbuf.len); } - if (add_null) - *obuf++ = '\0'; - msg_bytes = obuf - line; - } else + flags &= ~ICB_INIT; + } + if (add_null) { + if (outbuf.len == outbuf.size) + goto overflow; + outbuf.buf[outbuf.len++] = '\0'; + } + msg_bytes = outbuf.len; + } else #endif - 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 { + memcpy(line, perform_io(msg_bytes, PIO_INPUT_AND_CONSUME), 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) { + invalid_msg: + rprintf(FERROR, "invalid multi-message %d:%lu [%s%s]\n", + tag, (unsigned long)msg_bytes, who_am_i(), + inc_recurse ? "/inc" : ""); + exit_cleanup(RERR_STREAMIO); + } + data = perform_io(4, PIO_INPUT_AND_CONSUME); + val = IVAL(data, 0); + if (am_generator) + got_flist_entry_status(FES_SUCCESS, val); + else + successful_send(val); + break; + case MSG_NO_SEND: + if (msg_bytes != 4) + goto invalid_msg; + data = perform_io(4, PIO_INPUT_AND_CONSUME); + val = IVAL(data, 0); + if (am_generator) + got_flist_entry_status(FES_NO_SEND, val); + else + send_msg_int(MSG_NO_SEND, val); + break; + case MSG_ERROR_SOCKET: + case MSG_ERROR_UTF8: + case MSG_CLIENT: + case MSG_LOG: + if (!am_generator) + goto invalid_msg; + if (tag == MSG_ERROR_SOCKET) + msgs2stderr = 1; + /* FALL THROUGH */ + case MSG_INFO: + case MSG_ERROR: + case MSG_ERROR_XFER: + case MSG_WARNING: + if (msg_bytes >= sizeof line) { + overflow: + rprintf(FERROR, + "multiplexing overflow %d:%lu [%s%s]\n", + tag, (unsigned long)msg_bytes, who_am_i(), + inc_recurse ? "/inc" : ""); + exit_cleanup(RERR_STREAMIO); + } + memcpy(line, perform_io(msg_bytes, PIO_INPUT_AND_CONSUME), msg_bytes); + rwrite((enum logcode)tag, line, msg_bytes, !am_generator); + if (first_message) { + if (list_only && !am_sender && tag == 1 && msg_bytes < sizeof line) { line[msg_bytes] = '\0'; - log_delete(line, S_IFREG); + check_for_d_option_error(line); } - break; - case MSG_SUCCESS: - if (msg_bytes != 4) { - invalid_msg: - rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", - tag, (long)msg_bytes, who_am_i()); - exit_cleanup(RERR_STREAMIO); + first_message = 0; + } + break; + case MSG_ERROR_EXIT: + if (msg_bytes == 0) { + if (!am_sender && !am_generator) { + send_msg(MSG_ERROR_EXIT, "", 0, 0); + io_flush(FULL_FLUSH); } - read_loop(fd, line, msg_bytes); - successful_send(IVAL(line, 0)); - break; - case MSG_NO_SEND: - if (msg_bytes != 4) - goto invalid_msg; - read_loop(fd, line, msg_bytes); - send_msg_int(MSG_NO_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); + val = 0; + } else if (msg_bytes == 4) { + data = perform_io(4, PIO_INPUT_AND_CONSUME); + val = IVAL(data, 0); + if (protocol_version >= 31) { + if (am_generator) + send_msg_int(MSG_ERROR_EXIT, val); + else + send_msg(MSG_ERROR_EXIT, "", 0, 0); } - read_loop(fd, line, msg_bytes); - rwrite((enum logcode)tag, line, msg_bytes, 1); - break; - default: - rprintf(FERROR, "unexpected tag %d [%s]\n", - tag, who_am_i()); - exit_cleanup(RERR_STREAMIO); - } + } else + goto invalid_msg; + /* Send a negative linenum so that we don't end up + * with a duplicate exit message. */ + _exit_cleanup(val, __FILE__, 0 - __LINE__); + default: + rprintf(FERROR, "unexpected tag %d [%s%s]\n", + tag, who_am_i(), inc_recurse ? "/inc" : ""); + exit_cleanup(RERR_STREAMIO); } - - if (iobuf_in_remaining == 0) - io_flush(NORMAL_FLUSH); - - return cnt; } -/* Do a buffered read from fd. Don't return until all N bytes have - * been read. If all N can't be read then exit with an error. */ -static void readfd(int fd, char *buffer, size_t N) +static void drain_multiplex_messages(void) { - int cnt; - size_t total = 0; - - while (total < N) { - cnt = readfd_unbuffered(fd, buffer + total, N-total); - total += cnt; + while (IN_MULTIPLEXED && iobuf.in.len) { + if (iobuf.raw_input_ends_before) { + size_t raw_len = iobuf.raw_input_ends_before - iobuf.in.pos; + iobuf.raw_input_ends_before = 0; + if (raw_len >= iobuf.in.len) { + iobuf.in.len = 0; + break; + } + iobuf.in.pos += raw_len; + iobuf.in.len -= raw_len; + } + read_a_msg(); } +} - if (fd == write_batch_monitor_in) { - if ((size_t)write(batch_fd, buffer, total) != total) - exit_cleanup(RERR_FILEIO); +void wait_for_receiver(void) +{ + if (!iobuf.raw_input_ends_before) + read_a_msg(); + + if (iobuf.raw_input_ends_before) { + int ndx = read_int(iobuf.in_fd); + if (ndx < 0) { + switch (ndx) { + case NDX_FLIST_EOF: + flist_eof = 1; + if (DEBUG_GTE(FLIST, 3)) + rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i()); + break; + case NDX_DONE: + msgdone_cnt++; + break; + default: + exit_cleanup(RERR_STREAMIO); + } + } else { + struct file_list *flist; + if (DEBUG_GTE(FLIST, 2)) { + rprintf(FINFO, "[%s] receiving flist for dir %d\n", + who_am_i(), ndx); + } + flist = recv_file_list(iobuf.in_fd); + flist->parent_ndx = ndx; +#ifdef SUPPORT_HARD_LINKS + if (preserve_hard_links) + match_hard_links(flist); +#endif + } } - - if (fd == flist_forward_from) - writefd(iobuf_f_out, buffer, total); - - if (fd == sock_f_in) - stats.total_read += total; } unsigned short read_shortint(int f) { char b[2]; - readfd(f, b, 2); + read_buf(f, b, 2); return (UVAL(b, 1) << 8) + UVAL(b, 0); } @@ -1082,7 +1550,7 @@ int32 read_int(int f) char b[4]; int32 num; - readfd(f, b, 4); + read_buf(f, b, 4); num = IVAL(b, 0); #if SIZEOF_INT32 > 4 if (num & (int32)0x80000000) @@ -1094,14 +1562,14 @@ int32 read_int(int f) int32 read_varint(int f) { union { - char b[5]; - int32 x; + char b[5]; + int32 x; } u; uchar ch; int extra; u.x = 0; - readfd(f, (char*)&ch, 1); + ch = read_byte(f); extra = int_byte_extra[ch / 4]; if (extra) { uchar bit = ((uchar)1<<(8-extra)); @@ -1109,7 +1577,7 @@ int32 read_varint(int f) rprintf(FERROR, "Overflow in read_varint()\n"); exit_cleanup(RERR_STREAMIO); } - readfd(f, u.b, extra); + read_buf(f, u.b, extra); u.b[extra] = ch & (bit-1); } else u.b[0] = ch; @@ -1126,8 +1594,8 @@ int32 read_varint(int f) int64 read_varlong(int f, uchar min_bytes) { union { - char b[9]; - int64 x; + char b[9]; + int64 x; } u; char b2[8]; int extra; @@ -1137,7 +1605,7 @@ int64 read_varlong(int f, uchar min_bytes) #else u.x = 0; #endif - readfd(f, b2, min_bytes); + read_buf(f, b2, min_bytes); memcpy(u.b, b2+1, min_bytes-1); extra = int_byte_extra[CVAL(b2, 0) / 4]; if (extra) { @@ -1146,7 +1614,7 @@ int64 read_varlong(int f, uchar min_bytes) rprintf(FERROR, "Overflow in read_varlong()\n"); exit_cleanup(RERR_STREAMIO); } - readfd(f, u.b + min_bytes - 1, extra); + read_buf(f, u.b + min_bytes - 1, extra); u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1); #if SIZEOF_INT64 < 8 if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) { @@ -1178,26 +1646,69 @@ int64 read_longint(int f) rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); exit_cleanup(RERR_UNSUPPORTED); #else - readfd(f, b, 8); + read_buf(f, b, 8); return IVAL(b,0) | (((int64)IVAL(b,4))<<32); #endif } void read_buf(int f, char *buf, size_t len) { - readfd(f,buf,len); + if (f != iobuf.in_fd) { + if (safe_read(f, buf, len) != len) + whine_about_eof(False); /* Doesn't return. */ + goto batch_copy; + } + + if (!IN_MULTIPLEXED) { + memcpy(buf, perform_io(len, PIO_INPUT_AND_CONSUME), len); + total_data_read += len; + if (forward_flist_data) + write_buf(iobuf.out_fd, buf, len); + batch_copy: + if (f == write_batch_monitor_in) + safe_write(batch_fd, buf, len); + return; + } + + while (1) { + char *data; + size_t siz; + + while (!iobuf.raw_input_ends_before) + read_a_msg(); + + siz = MIN(len, iobuf.raw_input_ends_before - iobuf.in.pos); + data = perform_io(siz, PIO_INPUT_AND_CONSUME); + if (iobuf.in.pos == iobuf.raw_input_ends_before) + iobuf.raw_input_ends_before = 0; + + /* The bytes at the "data" pointer will survive long + * enough to make a copy, but not past future I/O. */ + memcpy(buf, data, siz); + total_data_read += siz; + + if (forward_flist_data) + write_buf(iobuf.out_fd, buf, siz); + + if (f == write_batch_monitor_in) + safe_write(batch_fd, buf, siz); + + if ((len -= siz) == 0) + break; + buf += siz; + } } void read_sbuf(int f, char *buf, size_t len) { - readfd(f, buf, len); + read_buf(f, buf, len); buf[len] = '\0'; } uchar read_byte(int f) { uchar c; - readfd(f, (char *)&c, 1); + read_buf(f, (char*)&c, 1); return c; } @@ -1215,7 +1726,7 @@ int read_vstring(int f, char *buf, int bufsize) } if (len) - readfd(f, buf, len); + read_buf(f, buf, len); buf[len] = '\0'; return len; } @@ -1224,6 +1735,7 @@ int read_vstring(int f, char *buf, int bufsize) * called by both the sender and the receiver. */ void read_sum_head(int f, struct sum_struct *sum) { + int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE; sum->count = read_int(f); if (sum->count < 0) { rprintf(FERROR, "Invalid checksum count %ld [%s]\n", @@ -1231,7 +1743,7 @@ void read_sum_head(int f, struct sum_struct *sum) exit_cleanup(RERR_PROTOCOL); } sum->blength = read_int(f); - if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { + if (sum->blength < 0 || sum->blength > max_blength) { rprintf(FERROR, "Invalid block length %ld [%s]\n", (long)sum->blength, who_am_i()); exit_cleanup(RERR_PROTOCOL); @@ -1267,8 +1779,7 @@ void write_sum_head(int f, struct sum_struct *sum) write_int(f, sum->remainder); } -/** - * Sleep after writing to limit I/O bandwidth usage. +/* 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 @@ -1281,8 +1792,7 @@ void write_sum_head(int f, struct sum_struct *sum) * 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. - **/ + * 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; @@ -1292,9 +1802,6 @@ static void sleep_for_bwlimit(int bytes_written) #define ONE_SEC 1000000L /* # of microseconds in a second */ - if (!bwlimit_writemax) - return; - total_written += bytes_written; gettimeofday(&start_tv, NULL); @@ -1322,156 +1829,16 @@ static void sleep_for_bwlimit(int bytes_written) 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, const char *buf, size_t len) -{ - size_t n, total = 0; - fd_set w_fds, r_fds, e_fds; - int maxfd, count, cnt, using_r_fds; - int defer_inc = 0; - struct timeval tv; - - if (no_flush++) - defer_forwarding_messages++, defer_inc++; - - while (total < len) { - FD_ZERO(&w_fds); - FD_SET(fd, &w_fds); - FD_ZERO(&e_fds); - FD_SET(fd, &e_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, &e_fds, &tv); - - if (count <= 0) { - if (count < 0 && errno == EBADF) - exit_cleanup(RERR_SOCKETIO); - check_timeout(); - continue; - } - - if (FD_ISSET(fd, &e_fds)) { - rsyserr(FINFO, errno, - "select exception on fd %d", fd); - } - - 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) - io_end_multiplex_out(); - /* Don't try to write errors down a failing msg pipe. */ - if (am_server && fd == msg_fd_out) - exit_cleanup(RERR_STREAMIO); - rsyserr(FERROR, errno, - "writefd_unbuffered failed to write %ld bytes [%s]", - (long)len, 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++, defer_inc++; - - if (fd == sock_f_out) { - if (io_timeout || am_generator) - last_io_out = time(NULL); - sleep_for_bwlimit(cnt); - } - } - - no_flush--; - if (!(defer_forwarding_messages -= defer_inc)) - msg_flush(); -} - void io_flush(int flush_it_all) { - if (!iobuf_out_cnt || no_flush) - return; - - if (io_multiplexing_out) - mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt, 0); - else - writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt); - iobuf_out_cnt = 0; - - if (flush_it_all && !defer_forwarding_messages) - msg_flush(); -} - -static void writefd(int fd, const char *buf, size_t len) -{ - if (fd == sock_f_out) - stats.total_written += len; - - if (fd == write_batch_monitor_out) { - if ((size_t)write(batch_fd, buf, len) != len) - exit_cleanup(RERR_FILEIO); - } - - if (!iobuf_out || fd != iobuf_f_out) { - writefd_unbuffered(fd, buf, len); - return; - } - - 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; - } - - if (iobuf_out_cnt == IO_BUFFER_SIZE) - io_flush(NORMAL_FLUSH); + if (iobuf.out.len > iobuf.out_empty_len) { + if (flush_it_all) /* FULL_FLUSH: flush everything in the output buffers */ + perform_io(iobuf.out.size - iobuf.out_empty_len, PIO_NEED_OUTROOM); + else /* NORMAL_FLUSH: flush at least 1 byte */ + perform_io(iobuf.out.size - iobuf.out.len + 1, PIO_NEED_OUTROOM); } + if (iobuf.msg.len) + perform_io(iobuf.msg.size, PIO_NEED_MSGROOM); } void write_shortint(int f, unsigned short x) @@ -1479,14 +1846,14 @@ void write_shortint(int f, unsigned short x) char b[2]; b[0] = (char)x; b[1] = (char)(x >> 8); - writefd(f, b, 2); + write_buf(f, b, 2); } void write_int(int f, int32 x) { char b[4]; SIVAL(b, 0, x); - writefd(f, b, 4); + write_buf(f, b, 4); } void write_varint(int f, int32 x) @@ -1508,7 +1875,7 @@ void write_varint(int f, int32 x) else *b = b[cnt]; - writefd(f, b, cnt); + write_buf(f, b, cnt); } void write_varlong(int f, int64 x, uchar min_bytes) @@ -1540,7 +1907,7 @@ void write_varlong(int f, int64 x, uchar min_bytes) else *b = b[cnt]; - writefd(f, b, cnt); + write_buf(f, b, cnt); } /* @@ -1553,7 +1920,7 @@ void write_longint(int f, int64 x) SIVAL(s, 0, x); if (x <= 0x7FFFFFFF && x >= 0) { - writefd(f, s, 4); + write_buf(f, s, 4); return; } @@ -1563,24 +1930,50 @@ void write_longint(int f, int64 x) #else memset(b, 0xFF, 4); SIVAL(s, 4, x >> 32); - writefd(f, b, 12); + write_buf(f, b, 12); #endif } void write_buf(int f, const char *buf, size_t len) { - writefd(f,buf,len); + size_t pos, siz; + + if (f != iobuf.out_fd) { + safe_write(f, buf, len); + goto batch_copy; + } + + if (iobuf.out.len + len > iobuf.out.size) + perform_io(len, PIO_NEED_OUTROOM); + + pos = iobuf.out.pos + iobuf.out.len; /* Must be set after any flushing. */ + if (pos >= iobuf.out.size) + pos -= iobuf.out.size; + + /* Handle a split copy if we wrap around the end of the circular buffer. */ + if (pos >= iobuf.out.pos && (siz = iobuf.out.size - pos) < len) { + memcpy(iobuf.out.buf + pos, buf, siz); + memcpy(iobuf.out.buf, buf + siz, len - siz); + } else + memcpy(iobuf.out.buf + pos, buf, len); + + iobuf.out.len += len; + total_data_written += len; + + batch_copy: + if (f == write_batch_monitor_out) + safe_write(batch_fd, buf, len); } -/** Write a string to the connection */ +/* Write a string to the connection */ void write_sbuf(int f, const char *buf) { - writefd(f, buf, strlen(buf)); + write_buf(f, buf, strlen(buf)); } void write_byte(int f, uchar c) { - writefd(f, (char *)&c, 1); + write_buf(f, (char *)&c, 1); } void write_vstring(int f, const char *str, int len) @@ -1598,9 +1991,9 @@ void write_vstring(int f, const char *str, int len) } *lb = len; - writefd(f, (char*)lenbuf, lb - lenbuf + 1); + write_buf(f, (char*)lenbuf, lb - lenbuf + 1); if (len) - writefd(f, str, len); + write_buf(f, str, len); } /* Send a file-list index using a byte-reduction method. */ @@ -1622,7 +2015,7 @@ void write_ndx(int f, int32 ndx) prev_positive = ndx; } else if (ndx == NDX_DONE) { *b = 0; - writefd(f, b, 1); + write_buf(f, b, 1); return; } else { b[cnt++] = (char)0xFF; @@ -1647,7 +2040,7 @@ void write_ndx(int f, int32 ndx) b[cnt++] = (char)(diff >> 8); b[cnt++] = (char)diff; } - writefd(f, b, cnt); + write_buf(f, b, cnt); } /* Receive a file-list index using a byte-reduction method. */ @@ -1660,20 +2053,20 @@ int32 read_ndx(int f) if (protocol_version < 30) return read_int(f); - readfd(f, b, 1); + read_buf(f, b, 1); if (CVAL(b, 0) == 0xFF) { - readfd(f, b, 1); + read_buf(f, b, 1); prev_ptr = &prev_negative; } else if (CVAL(b, 0) == 0) return NDX_DONE; else prev_ptr = &prev_positive; if (CVAL(b, 0) == 0xFE) { - readfd(f, b, 2); + read_buf(f, b, 2); if (CVAL(b, 0) & 0x80) { b[3] = CVAL(b, 0) & ~0x80; b[0] = b[1]; - readfd(f, b+1, 2); + read_buf(f, b+1, 2); num = IVAL(b, 0); } else num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr; @@ -1685,29 +2078,27 @@ int32 read_ndx(int f) return num; } -/** - * 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) +/* Read a line of up to bufsiz-1 characters into buf. Strips + * the (required) trailing newline and all carriage returns. + * Returns 1 for success; 0 for I/O error or truncation. */ +int read_line_old(int fd, char *buf, size_t bufsiz) { - while (maxlen) { - buf[0] = 0; - read_buf(f, buf, 1); - if (buf[0] == 0) + bufsiz--; /* leave room for the null */ + while (bufsiz > 0) { + assert(fd != iobuf.in_fd); + if (safe_read(fd, buf, 1) == 0) return 0; - if (buf[0] == '\n') + if (*buf == '\0') + return 0; + if (*buf == '\n') break; - if (buf[0] != '\r') { + if (*buf != '\r') { buf++; - maxlen--; + bufsiz--; } } *buf = '\0'; - return maxlen > 0; + return bufsiz > 0; } void io_printf(int fd, const char *format, ...) @@ -1721,54 +2112,75 @@ void io_printf(int fd, const char *format, ...) va_end(ap); if (len < 0) - exit_cleanup(RERR_STREAMIO); + exit_cleanup(RERR_PROTOCOL); if (len > (int)sizeof buf) { rprintf(FERROR, "io_printf() was too long for the buffer.\n"); - exit_cleanup(RERR_STREAMIO); + exit_cleanup(RERR_PROTOCOL); } write_sbuf(fd, buf); } -/** Setup for multiplexing a MSG_* stream with the data stream. */ -void io_start_multiplex_out(void) +/* Setup for multiplexing a MSG_* stream with the data stream. */ +void io_start_multiplex_out(int fd) { - io_flush(NORMAL_FLUSH); - io_start_buffering_out(sock_f_out); - io_multiplexing_out = 1; -} + io_flush(FULL_FLUSH); -/** Setup for multiplexing a MSG_* stream with the data stream. */ -void io_start_multiplex_in(void) -{ - io_flush(NORMAL_FLUSH); - io_start_buffering_in(sock_f_in); - io_multiplexing_in = 1; + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] io_start_multiplex_out(%d)\n", who_am_i(), fd); + + iobuf.out_empty_len = 4; /* See also OUT_MULTIPLEXED */ + io_start_buffering_out(fd); + + iobuf.raw_data_header_pos = iobuf.out.pos + iobuf.out.len; + iobuf.out.len += 4; } -/** Write an message to the multiplexed data stream. */ -int io_multiplex_write(enum msgcode code, const char *buf, size_t len, int convert) +/* Setup for multiplexing a MSG_* stream with the data stream. */ +void io_start_multiplex_in(int fd) { - if (!io_multiplexing_out) - return 0; - io_flush(NORMAL_FLUSH); - stats.total_written += (len+4); - mplex_write(sock_f_out, code, buf, len, convert); - return 1; + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] io_start_multiplex_in(%d)\n", who_am_i(), fd); + + iobuf.in_multiplexed = True; /* See also IN_MULTIPLEXED */ + io_start_buffering_in(fd); } -void io_end_multiplex_in(void) +int io_end_multiplex_in(int mode) { - io_multiplexing_in = 0; - io_end_buffering_in(); + int ret = iobuf.in_multiplexed ? iobuf.in_fd : -1; + + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] io_end_multiplex_in(mode=%d)\n", who_am_i(), mode); + + iobuf.in_multiplexed = False; + if (mode == MPLX_SWITCHING) + iobuf.raw_input_ends_before = 0; + else + assert(iobuf.raw_input_ends_before == 0); + if (mode != MPLX_TO_BUFFERED) + io_end_buffering_in(mode); + + return ret; } -/** Stop output multiplexing. */ -void io_end_multiplex_out(void) +int io_end_multiplex_out(int mode) { - io_multiplexing_out = 0; - io_end_buffering_out(); + int ret = iobuf.out_empty_len ? iobuf.out_fd : -1; + + if (msgs2stderr && DEBUG_GTE(IO, 2)) + rprintf(FINFO, "[%s] io_end_multiplex_out(mode=%d)\n", who_am_i(), mode); + + if (mode != MPLX_TO_BUFFERED) + io_end_buffering_out(mode); + else + io_flush(FULL_FLUSH); + + iobuf.out.len = 0; + iobuf.out_empty_len = 0; + + return ret; } void start_write_batch(int fd) @@ -1779,6 +2191,8 @@ void start_write_batch(int fd) * actual communication so far depends on whether a daemon * is involved. */ write_int(batch_fd, protocol_version); + if (protocol_version >= 30) + write_byte(batch_fd, inc_recurse); write_int(batch_fd, checksum_seed); if (am_sender)