/* * Socket and pipe I/O utilities used in rsync. * * Copyright (C) 1996-2001 Andrew Tridgell * Copyright (C) 1996 Paul Mackerras * Copyright (C) 2001, 2002 Martin Pool * 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 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 * 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, visit the http://fsf.org website. */ /* Rsync provides its own multiplexing system, which is used to send * stderr and stdout over a single socket. * * For historical reasons this is off during the start of the * connection, but it's switched on quite early using * io_start_multiplex_out() and io_start_multiplex_in(). */ #include "rsync.h" #include "ifuncs.h" /** If no timeout is specified then use a 60 second select timeout */ #define SELECT_TIMEOUT 60 extern int bwlimit; extern size_t bwlimit_writemax; extern int io_timeout; extern int am_server; extern int am_daemon; extern int am_sender; extern int am_generator; extern int inc_recurse; extern int io_error; extern int eol_nulls; extern int flist_eof; extern int list_only; extern int read_batch; extern int compat_flags; extern int protect_args; extern int checksum_seed; extern int protocol_version; extern int remove_source_files; extern int preserve_hard_links; extern struct stats stats; extern struct file_list *cur_flist; #ifdef ICONV_OPTION extern int filesfrom_convert; extern iconv_t ic_send, ic_recv; #endif int csum_length = SHORT_SUM_LENGTH; /* initial value */ int allowed_lull = 0; int ignore_timeout = 0; int batch_fd = -1; int msgdone_cnt = 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; static int iobuf_f_out = -1; static char *iobuf_out; static int iobuf_out_cnt; 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 xbuf ff_buf = EMPTY_XBUF; static char ff_lastchar; #ifdef ICONV_OPTION static xbuf iconv_buf = EMPTY_XBUF; #endif static int defer_forwarding_messages = 0, keep_defer_forwarding = 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 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */ 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */ }; #define REMOTE_OPTION_ERROR "rsync: on remote machine: -" #define REMOTE_OPTION_ERROR2 ": unknown option" enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND }; static void check_timeout(void) { time_t t, chk; if (!io_timeout || ignore_timeout) return; t = time(NULL); if (!last_io_in) last_io_in = t; chk = MAX(last_io_out, last_io_in); if (t - chk >= io_timeout) { if (am_server || am_daemon) exit_cleanup(RERR_TIMEOUT); rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n", who_am_i(), (int)(t-chk)); exit_cleanup(RERR_TIMEOUT); } } 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 mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert); static flist_ndx_list redo_list, hlink_list; struct msg_list_item { struct msg_list_item *next; char convert; char buf[1]; }; struct msg_list { struct msg_list_item *head, *tail; }; static struct msg_list msg_queue; static void got_flist_entry_status(enum festatus status, const char *buf) { int ndx = IVAL(buf, 0); struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status"); if (remove_source_files) { active_filecnt--; active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); } if (inc_recurse) flist->in_progress--; switch (status) { case FES_SUCCESS: if (remove_source_files) send_msg(MSG_SUCCESS, buf, 4, 0); 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; } } /* Note the fds used for the main socket (which might really be a pipe * for a local transfer, but we can ignore that). */ void io_set_sock_fds(int f_in, int f_out) { sock_f_in = f_in; sock_f_out = f_out; } void set_io_timeout(int secs) { io_timeout = secs; allowed_lull = (io_timeout + 1) / 2; if (!io_timeout || allowed_lull > SELECT_TIMEOUT) select_timeout = SELECT_TIMEOUT; else select_timeout = allowed_lull; if (read_batch) allowed_lull = 0; } /* Setup the fd used to receive MSG_* messages. Only needed during the * early stages of being a local sender (up through the sending of the * file list) or when we're the generator (to fetch the messages from * the receiver). */ void set_msg_fd_in(int fd) { msg_fd_in = fd; } /* Setup the fd used to send our MSG_* messages. Only needed when * we're the receiver (to send our messages to the generator). */ void set_msg_fd_out(int fd) { msg_fd_out = fd; set_nonblocking(msg_fd_out); } /* Add a message to the pending MSG_* list. */ static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert) { 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; } static inline int flush_a_msg(int fd) { 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(fd, tag, m->buf + 4, len, m->convert); defer_forwarding_messages--; free(m); return len; } static void msg_flush(void) { if (am_generator) { while (msg_queue.head && io_multiplexing_out) stats.total_written += flush_a_msg(sock_f_out) + 4; } else { while (msg_queue.head) (void)flush_a_msg(msg_fd_out); } } static void check_for_d_option_error(const char *msg) { static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz"; char *colon; int saw_d = 0; if (*msg != 'r' || strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0) return; msg += sizeof REMOTE_OPTION_ERROR - 1; if (*msg == '-' || (colon = strchr(msg, ':')) == NULL || strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0) return; for ( ; *msg != ':'; msg++) { if (*msg == 'd') saw_d = 1; else if (*msg == 'e') break; else if (strchr(rsync263_opts, *msg) == NULL) return; } if (saw_d) { rprintf(FWARNING, "*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n"); } } /* Read a message from the MSG_* fd and handle it. This is called either * during the early stages of being a local sender (up through the sending * of the file list) or when we're the generator (to fetch the messages * from the receiver). */ static void read_msg_fd(void) { char buf[2048]; size_t n; 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; 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); } if (len) { readfd(fd, buf, len); stats.total_read = read_varlong(fd, 3); } msgdone_cnt++; break; case MSG_REDO: if (len != 4 || !am_generator) goto invalid_msg; readfd(fd, buf, 4); got_flist_entry_status(FES_REDO, buf); 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)); } flist = recv_file_list(fd); flist->parent_ndx = IVAL(buf,0); #ifdef SUPPORT_HARD_LINKS if (preserve_hard_links) match_hard_links(flist); #endif break; case MSG_FLIST_EOF: if (len != 0 || !am_generator || !inc_recurse) goto invalid_msg; flist_eof = 1; break; case MSG_IO_ERROR: if (len != 4) goto invalid_msg; readfd(fd, buf, len); io_error |= IVAL(buf, 0); 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, 4); got_flist_entry_status(FES_SUCCESS, buf); break; case MSG_NO_SEND: if (len != 4 || !am_generator) goto invalid_msg; readfd(fd, buf, 4); got_flist_entry_status(FES_NO_SEND, buf); break; case MSG_ERROR_SOCKET: case MSG_ERROR_UTF8: case MSG_CLIENT: if (!am_generator) goto invalid_msg; if (tag == MSG_ERROR_SOCKET) io_end_multiplex_out(); /* FALL THROUGH */ case MSG_INFO: case MSG_ERROR: case MSG_ERROR_XFER: case MSG_WARNING: 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; } break; default: rprintf(FERROR, "unknown message %d:%d [%s]\n", tag, len, who_am_i()); exit_cleanup(RERR_STREAMIO); } no_flush--; msg_fd_in = fd; if (!--defer_forwarding_messages && !no_flush) msg_flush(); } /* 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; if (iobuf_out_cnt) io_flush(NORMAL_FLUSH); else read_msg_fd(); } active_filecnt++; active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]); } /* 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) { char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */ size_t n = len; #ifdef ICONV_OPTION /* We need to convert buf before doing anything else so that we * can include the (converted) byte length in the message header. */ if (convert && ic_send != (iconv_t)-1) { xbuf outbuf, inbuf; INIT_XBUF(outbuf, buffer + 4, 0, sizeof buffer - 4); INIT_XBUF(inbuf, (char*)buf, len, -1); iconvbufs(ic_send, &inbuf, &outbuf, ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE); if (inbuf.len > 0) { rprintf(FERROR, "overflowed conversion buffer in mplex_write"); exit_cleanup(RERR_UNSUPPORTED); } n = len = outbuf.len; } else #endif if (n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */ n = 0; /* We'd rather do 2 writes than too much memcpy(). */ else memcpy(buffer + 4, buf, n); SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); keep_defer_forwarding++; /* defer_forwarding_messages++ on return */ writefd_unbuffered(fd, buffer, n+4); keep_defer_forwarding--; if (len > n) writefd_unbuffered(fd, buf+n, len-n); if (!--defer_forwarding_messages && !no_flush) msg_flush(); } 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; } if (flist_forward_from >= 0) msg_list_add(&msg_queue, code, buf, len, convert); else mplex_write(msg_fd_out, code, buf, len, convert); return 1; } void send_msg_int(enum msgcode code, int num) { char numbuf[4]; SIVAL(numbuf, 0, num); send_msg(code, numbuf, 4, 0); } void wait_for_receiver(void) { if (io_flush(NORMAL_FLUSH)) return; read_msg_fd(); } int get_redo_num(void) { return flist_ndx_pop(&redo_list); } int get_hlink_num(void) { return flist_ndx_pop(&hlink_list); } /** * When we're the receiver and we have a local --files-from list of names * that needs to be sent over the socket to the sender, we have to do two * things at the same time: send the sender a list of what files we're * processing and read the incoming file+info list from the sender. We do * this by augmenting the read_timeout() function to copy this data. It * uses ff_buf to read a block of data from f_in (when it is ready, since * it might be a pipe) and then blast it out f_out (when it is ready to * receive more data). */ void io_set_filesfrom_fds(int f_in, int f_out) { io_filesfrom_f_in = f_in; io_filesfrom_f_out = f_out; alloc_xbuf(&ff_buf, 2048); #ifdef ICONV_OPTION if (protect_args) alloc_xbuf(&iconv_buf, 1024); #endif } /* It's almost always an error to get an EOF when we're trying to read from the * network, because the protocol is (for the most part) self-terminating. * * There is one case for the receiver when it is at the end of the transfer * (hanging around reading any keep-alive packets that might come its way): if * the sender dies before the generator's kill-signal comes through, we can end * up here needing to loop until the kill-signal arrives. In this situation, * kluge_around_eof will be < 0. * * There is another case for older protocol versions (< 24) where the module * listing was not terminated, so we must ignore an EOF error in that case and * exit. In this situation, kluge_around_eof will be > 0. */ static void whine_about_eof(int fd) { if (kluge_around_eof && fd == sock_f_in) { int i; if (kluge_around_eof > 0) exit_cleanup(0); /* If we're still here after 10 seconds, exit with an error. */ for (i = 10*1000/20; i--; ) msleep(20); } rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " "(%.0f bytes received so far) [%s]\n", (double)stats.total_read, who_am_i()); exit_cleanup(RERR_STREAMIO); } /** * Read from a socket with I/O timeout. return the number of bytes * read. If no bytes can be read then exit, never return a number <= 0. * * TODO: If the remote shell connection fails, then current versions * actually report an "unexpected EOF" error here. Since it's a * fairly common mistake to try to use rsh when ssh is required, we * should trap that: if we fail to read any data at all, we should * give a better explanation. We can tell whether the connection has * started by looking e.g. at whether the remote version is known yet. */ static int read_timeout(int fd, char *buf, size_t len) { int n, cnt = 0; io_flush(FULL_FLUSH); while (cnt == 0) { /* until we manage to read *something* */ fd_set r_fds, w_fds; struct timeval tv; int maxfd = fd; int count; FD_ZERO(&r_fds); FD_ZERO(&w_fds); FD_SET(fd, &r_fds); if (io_filesfrom_f_out >= 0) { int new_fd; if (ff_buf.len == 0) { if (io_filesfrom_f_in >= 0) { FD_SET(io_filesfrom_f_in, &r_fds); new_fd = io_filesfrom_f_in; } else { io_filesfrom_f_out = -1; new_fd = -1; } } else { FD_SET(io_filesfrom_f_out, &w_fds); new_fd = io_filesfrom_f_out; } if (new_fd > maxfd) maxfd = new_fd; } tv.tv_sec = select_timeout; tv.tv_usec = 0; errno = 0; count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); if (count <= 0) { if (errno == EBADF) { defer_forwarding_messages = 0; exit_cleanup(RERR_SOCKETIO); } check_timeout(); continue; } if (io_filesfrom_f_out >= 0) { if (ff_buf.len) { if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { int l = write(io_filesfrom_f_out, ff_buf.buf + ff_buf.pos, ff_buf.len); if (l > 0) { if (!(ff_buf.len -= l)) ff_buf.pos = 0; else ff_buf.pos += 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)) { #ifdef ICONV_OPTION xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf; #else xbuf *ibuf = &ff_buf; #endif int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size); if (l <= 0) { if (l == 0 || errno != EINTR) { /* Send end-of-file marker */ memcpy(ff_buf.buf, "\0\0", 2); ff_buf.len = ff_lastchar? 2 : 1; ff_buf.pos = 0; io_filesfrom_f_in = -1; } } else { #ifdef ICONV_OPTION if (filesfrom_convert) { iconv_buf.pos = 0; iconv_buf.len = l; iconvbufs(ic_send, &iconv_buf, &ff_buf, ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE); l = ff_buf.len; } #endif if (!eol_nulls) { char *s = ff_buf.buf + l; /* Transform CR and/or LF into '\0' */ while (s-- > ff_buf.buf) { if (*s == '\n' || *s == '\r') *s = '\0'; } } if (!ff_lastchar) { /* Last buf ended with a '\0', so don't * let this buf start with one. */ while (l && ff_buf.buf[ff_buf.pos] == '\0') ff_buf.pos++, l--; } if (!l) ff_buf.pos = 0; else { char *f = ff_buf.buf + ff_buf.pos; char *t = f; char *eob = f + l; /* Eliminate any multi-'\0' runs. */ while (f != eob) { if (!(*t++ = *f++)) { while (f != eob && !*f) f++, l--; } } ff_lastchar = f[-1]; } ff_buf.len = l; } } } } if (!FD_ISSET(fd, &r_fds)) continue; n = read(fd, buf, len); if (n <= 0) { if (n == 0) whine_about_eof(fd); /* Doesn't return. */ if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) continue; /* Don't write errors on a dead socket. */ if (fd == sock_f_in) { io_end_multiplex_out(); rsyserr(FERROR_SOCKET, errno, "read error"); } else rsyserr(FERROR, errno, "read error"); exit_cleanup(RERR_STREAMIO); } buf += n; len -= n; cnt += n; if (fd == sock_f_in && io_timeout) last_io_in = time(NULL); } return cnt; } /* Read a line into the "buf" buffer. */ int read_line(int fd, char *buf, size_t bufsiz, int flags) { char ch, *s, *eob; int cnt; #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) { 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)) rprintf(FINFO, "select exception on fd %d\n", fd); */ continue; } if (cnt != 1) 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'; if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';')) goto start; #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); outbuf.buf[outbuf.len] = '\0'; return outbuf.len; } #endif return s - buf; } 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) { 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"; while (1) { 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; } } argv[argc] = NULL; glob_expand(NULL, NULL, NULL, NULL); *argc_p = argc; *argv_p = argv; } int io_start_buffering_out(int f_out) { if (iobuf_out) { assert(f_out == iobuf_f_out); return 0; } if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) out_of_memory("io_start_buffering_out"); iobuf_out_cnt = 0; iobuf_f_out = f_out; return 1; } int io_start_buffering_in(int f_in) { if (iobuf_in) { assert(f_in == iobuf_f_in); return 0; } iobuf_in_siz = 2 * IO_BUFFER_SIZE; if (!(iobuf_in = new_array(char, iobuf_in_siz))) out_of_memory("io_start_buffering_in"); iobuf_f_in = f_in; return 1; } void io_end_buffering_in(void) { if (!iobuf_in) return; free(iobuf_in); iobuf_in = NULL; iobuf_in_ndx = 0; iobuf_in_remaining = 0; iobuf_f_in = -1; } void io_end_buffering_out(void) { if (!iobuf_out) return; io_flush(FULL_FLUSH); free(iobuf_out); iobuf_out = NULL; iobuf_f_out = -1; } void maybe_flush_socket(int important) { if (iobuf_out && iobuf_out_cnt && (important || time(NULL) - last_io_out >= 5)) io_flush(NORMAL_FLUSH); } void maybe_send_keepalive(void) { if (time(NULL) - last_io_out >= allowed_lull) { if (!iobuf_out || !iobuf_out_cnt) { if (protocol_version < 29) send_msg(MSG_DATA, "", 0, 0); else if (protocol_version >= 30) send_msg(MSG_NOOP, "", 0, 0); else { write_int(sock_f_out, cur_flist->used); write_shortint(sock_f_out, ITEM_IS_NEW); } } if (iobuf_out) 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; defer_forwarding_messages++; } void stop_flist_forward(void) { flist_forward_from = -1; defer_forwarding_messages--; io_flush(FULL_FLUSH); } /** * Continue trying to read len bytes - don't return until len has been * read. **/ static void read_loop(int fd, char *buf, size_t len) { while (len) { int n = read_timeout(fd, buf, len); buf += n; len -= n; } } /** * Read from the file descriptor handling multiplexing - return number * of bytes read. * * Never returns <= 0. */ static int readfd_unbuffered(int fd, char *buf, size_t len) { 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; } read_loop(fd, line, 4); tag = IVAL(line, 0); msg_bytes = tag & 0xFFFFFF; tag = (tag >> 24) - MPLEX_BASE; switch (tag) { case MSG_DATA: if (msg_bytes > iobuf_in_siz) { if (!(iobuf_in = realloc_array(iobuf_in, char, msg_bytes))) out_of_memory("readfd_unbuffered"); iobuf_in_siz = msg_bytes; } read_loop(fd, iobuf_in, msg_bytes); iobuf_in_remaining = msg_bytes; iobuf_in_ndx = 0; break; case MSG_NOOP: if (msg_bytes != 0) goto invalid_msg; if (am_sender) maybe_send_keepalive(); break; case MSG_IO_ERROR: if (msg_bytes != 4) goto invalid_msg; read_loop(fd, line, msg_bytes); send_msg_int(MSG_IO_ERROR, IVAL(line, 0)); io_error |= IVAL(line, 0); break; case MSG_DELETED: if (msg_bytes >= sizeof line) goto overflow; #ifdef ICONV_OPTION if (ic_recv != (iconv_t)-1) { xbuf outbuf, inbuf; char ibuf[512]; int add_null = 0; int pos = 0; INIT_CONST_XBUF(outbuf, line); INIT_XBUF(inbuf, ibuf, 0, -1); while (msg_bytes) { inbuf.len = msg_bytes > sizeof ibuf ? sizeof ibuf : msg_bytes; read_loop(fd, inbuf.buf, inbuf.len); if (!(msg_bytes -= inbuf.len) && !ibuf[inbuf.len-1]) inbuf.len--, add_null = 1; if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE) < 0) goto overflow; pos = -1; } 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 { 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:%ld [%s]\n", tag, (long)msg_bytes, who_am_i()); exit_cleanup(RERR_STREAMIO); } read_loop(fd, line, msg_bytes); successful_send(IVAL(line, 0)); break; case MSG_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: case MSG_ERROR_XFER: case MSG_WARNING: if (msg_bytes >= sizeof line) { overflow: rprintf(FERROR, "multiplexing overflow %d:%ld [%s]\n", tag, (long)msg_bytes, who_am_i()); exit_cleanup(RERR_STREAMIO); } read_loop(fd, line, msg_bytes); rwrite((enum logcode)tag, line, msg_bytes, 1); if (first_message) { if (list_only && !am_sender && tag == 1) { line[msg_bytes] = '\0'; check_for_d_option_error(line); } first_message = 0; } break; default: rprintf(FERROR, "unexpected tag %d [%s]\n", tag, who_am_i()); 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) { int cnt; size_t total = 0; while (total < N) { cnt = readfd_unbuffered(fd, buffer + total, N-total); total += cnt; } if (fd == write_batch_monitor_in) { if ((size_t)write(batch_fd, buffer, total) != total) exit_cleanup(RERR_FILEIO); } if (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); return (UVAL(b, 1) << 8) + UVAL(b, 0); } int32 read_int(int f) { char b[4]; int32 num; readfd(f, b, 4); num = IVAL(b, 0); #if SIZEOF_INT32 > 4 if (num & (int32)0x80000000) num |= ~(int32)0xffffffff; #endif return num; } int32 read_varint(int f) { union { char b[5]; int32 x; } u; uchar ch; int extra; u.x = 0; readfd(f, (char*)&ch, 1); extra = int_byte_extra[ch / 4]; if (extra) { uchar bit = ((uchar)1<<(8-extra)); if (extra >= (int)sizeof u.b) { rprintf(FERROR, "Overflow in read_varint()\n"); exit_cleanup(RERR_STREAMIO); } readfd(f, u.b, extra); u.b[extra] = ch & (bit-1); } else u.b[0] = ch; #if CAREFUL_ALIGNMENT u.x = IVAL(u.b,0); #endif #if SIZEOF_INT32 > 4 if (u.x & (int32)0x80000000) u.x |= ~(int32)0xffffffff; #endif return u.x; } int64 read_varlong(int f, uchar min_bytes) { union { char b[9]; int64 x; } u; char b2[8]; int extra; #if SIZEOF_INT64 < 8 memset(u.b, 0, 8); #else u.x = 0; #endif readfd(f, b2, min_bytes); memcpy(u.b, b2+1, min_bytes-1); extra = int_byte_extra[CVAL(b2, 0) / 4]; if (extra) { uchar bit = ((uchar)1<<(8-extra)); if (min_bytes + extra > (int)sizeof u.b) { rprintf(FERROR, "Overflow in read_varlong()\n"); exit_cleanup(RERR_STREAMIO); } readfd(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) { rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); exit_cleanup(RERR_UNSUPPORTED); } #endif } else u.b[min_bytes + extra - 1] = CVAL(b2, 0); #if SIZEOF_INT64 < 8 u.x = IVAL(u.b,0); #elif CAREFUL_ALIGNMENT u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32); #endif return u.x; } int64 read_longint(int f) { #if SIZEOF_INT64 >= 8 char b[9]; #endif int32 num = read_int(f); if (num != (int32)0xffffffff) return num; #if SIZEOF_INT64 < 8 rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); exit_cleanup(RERR_UNSUPPORTED); #else readfd(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); } void read_sbuf(int f, char *buf, size_t len) { readfd(f, buf, len); buf[len] = '\0'; } uchar read_byte(int f) { uchar c; readfd(f, (char *)&c, 1); return c; } int read_vstring(int f, char *buf, int bufsize) { int len = read_byte(f); if (len & 0x80) len = (len & ~0x80) * 0x100 + read_byte(f); if (len >= bufsize) { rprintf(FERROR, "over-long vstring received (%d > %d)\n", len, bufsize - 1); return -1; } if (len) readfd(f, buf, len); buf[len] = '\0'; return len; } /* Populate a sum_struct with values from the socket. This is * called by both the sender and the receiver. */ void read_sum_head(int f, struct sum_struct *sum) { 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", (long)sum->count, who_am_i()); exit_cleanup(RERR_PROTOCOL); } sum->blength = read_int(f); 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); } sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) { rprintf(FERROR, "Invalid checksum length %d [%s]\n", sum->s2length, who_am_i()); exit_cleanup(RERR_PROTOCOL); } sum->remainder = read_int(f); if (sum->remainder < 0 || sum->remainder > sum->blength) { rprintf(FERROR, "Invalid remainder length %ld [%s]\n", (long)sum->remainder, who_am_i()); exit_cleanup(RERR_PROTOCOL); } } /* Send the values from a sum_struct over the socket. Set sum to * NULL if there are no checksums to send. This is called by both * the generator and the sender. */ void write_sum_head(int f, struct sum_struct *sum) { static struct sum_struct null_sum; if (sum == NULL) sum = &null_sum; write_int(f, sum->count); write_int(f, sum->blength); if (protocol_version >= 27) write_int(f, sum->s2length); write_int(f, sum->remainder); } /** * Sleep after writing to limit I/O bandwidth usage. * * @todo Rather than sleeping after each write, it might be better to * use some kind of averaging. The current algorithm seems to always * use a bit less bandwidth than specified, because it doesn't make up * for slow periods. But arguably this is a feature. In addition, we * ought to take the time used to write the data into account. * * During some phases of big transfers (file FOO is uptodate) this is * called with a small bytes_written every time. As the kernel has to * round small waits up to guarantee that we actually wait at least the * requested number of microseconds, this can become grossly inaccurate. * We therefore keep track of the bytes we've written over time and only * sleep when the accumulated delay is at least 1 tenth of a second. **/ static void sleep_for_bwlimit(int bytes_written) { static struct timeval prior_tv; static long total_written = 0; struct timeval tv, start_tv; long elapsed_usec, sleep_usec; #define ONE_SEC 1000000L /* # of microseconds in a second */ if (!bwlimit_writemax) return; 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; } 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); } static const char *what_fd_is(int fd) { static char buf[20]; if (fd == sock_f_out) return "socket"; else if (fd == msg_fd_out) return "message fd"; else if (fd == batch_fd) return "batch file"; else { snprintf(buf, sizeof buf, "fd %d", fd); return buf; } } /* 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)) rprintf(FINFO, "select exception on fd %d\n", 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 to %s [%s]", (long)len, what_fd_is(fd), who_am_i()); /* If the other side is sending us error messages, try * to grab any messages they sent before they died. */ while (!am_server && fd == sock_f_out && io_multiplexing_in) { char buf[1024]; set_io_timeout(30); ignore_timeout = 0; readfd_unbuffered(sock_f_in, buf, sizeof 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 (keep_defer_forwarding) defer_inc--; if (!(defer_forwarding_messages -= defer_inc) && !no_flush) msg_flush(); } int io_flush(int flush_it_all) { int flushed_something = 0; if (no_flush) return 0; if (iobuf_out_cnt) { 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; flushed_something = 1; } if (flush_it_all && !defer_forwarding_messages && msg_queue.head) { msg_flush(); flushed_something = 1; } return flushed_something; } 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) writefd_unbuffered(batch_fd, buf, len); 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); } } void write_shortint(int f, unsigned short x) { char b[2]; b[0] = (char)x; b[1] = (char)(x >> 8); writefd(f, b, 2); } void write_int(int f, int32 x) { char b[4]; SIVAL(b, 0, x); writefd(f, b, 4); } void write_varint(int f, int32 x) { char b[5]; uchar bit; int cnt = 4; SIVAL(b, 1, x); while (cnt > 1 && b[cnt] == 0) cnt--; bit = ((uchar)1<<(7-cnt+1)); if (CVAL(b, cnt) >= bit) { cnt++; *b = ~(bit-1); } else if (cnt > 1) *b = b[cnt] | ~(bit*2-1); else *b = b[cnt]; writefd(f, b, cnt); } void write_varlong(int f, int64 x, uchar min_bytes) { char b[9]; uchar bit; int cnt = 8; SIVAL(b, 1, x); #if SIZEOF_INT64 >= 8 SIVAL(b, 5, x >> 32); #else if (x <= 0x7FFFFFFF && x >= 0) memset(b + 5, 0, 4); else { rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); exit_cleanup(RERR_UNSUPPORTED); } #endif while (cnt > min_bytes && b[cnt] == 0) cnt--; bit = ((uchar)1<<(7-cnt+min_bytes)); if (CVAL(b, cnt) >= bit) { cnt++; *b = ~(bit-1); } else if (cnt > min_bytes) *b = b[cnt] | ~(bit*2-1); else *b = b[cnt]; writefd(f, b, cnt); } /* * Note: int64 may actually be a 32-bit type if ./configure couldn't find any * 64-bit types on this platform. */ void write_longint(int f, int64 x) { char b[12], * const s = b+4; SIVAL(s, 0, x); if (x <= 0x7FFFFFFF && x >= 0) { writefd(f, s, 4); return; } #if SIZEOF_INT64 < 8 rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); exit_cleanup(RERR_UNSUPPORTED); #else memset(b, 0xFF, 4); SIVAL(s, 4, x >> 32); writefd(f, b, 12); #endif } void write_buf(int f, const char *buf, size_t len) { writefd(f,buf,len); } /** Write a string to the connection */ void write_sbuf(int f, const char *buf) { writefd(f, buf, strlen(buf)); } void write_byte(int f, uchar c) { writefd(f, (char *)&c, 1); } void write_vstring(int f, const char *str, int len) { uchar lenbuf[3], *lb = lenbuf; if (len > 0x7F) { if (len > 0x7FFF) { rprintf(FERROR, "attempting to send over-long vstring (%d > %d)\n", len, 0x7FFF); exit_cleanup(RERR_PROTOCOL); } *lb++ = len / 0x100 + 0x80; } *lb = len; writefd(f, (char*)lenbuf, lb - lenbuf + 1); if (len) writefd(f, str, len); } /* Send a file-list index using a byte-reduction method. */ void write_ndx(int f, int32 ndx) { static int32 prev_positive = -1, prev_negative = 1; int32 diff, cnt = 0; char b[6]; if (protocol_version < 30 || read_batch) { write_int(f, ndx); return; } /* Send NDX_DONE as a single-byte 0 with no side effects. Send * negative nums as a positive after sending a leading 0xFF. */ if (ndx >= 0) { diff = ndx - prev_positive; prev_positive = ndx; } else if (ndx == NDX_DONE) { *b = 0; writefd(f, b, 1); return; } else { b[cnt++] = (char)0xFF; ndx = -ndx; diff = ndx - prev_negative; prev_negative = ndx; } /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767 * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE * & all 4 bytes of the (non-negative) num with the high-bit set. */ if (diff < 0xFE && diff > 0) b[cnt++] = (char)diff; else if (diff < 0 || diff > 0x7FFF) { b[cnt++] = (char)0xFE; b[cnt++] = (char)((ndx >> 24) | 0x80); b[cnt++] = (char)ndx; b[cnt++] = (char)(ndx >> 8); b[cnt++] = (char)(ndx >> 16); } else { b[cnt++] = (char)0xFE; b[cnt++] = (char)(diff >> 8); b[cnt++] = (char)diff; } writefd(f, b, cnt); } /* Receive a file-list index using a byte-reduction method. */ int32 read_ndx(int f) { static int32 prev_positive = -1, prev_negative = 1; int32 *prev_ptr, num; char b[4]; if (protocol_version < 30) return read_int(f); readfd(f, b, 1); if (CVAL(b, 0) == 0xFF) { readfd(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); if (CVAL(b, 0) & 0x80) { b[3] = CVAL(b, 0) & ~0x80; b[0] = b[1]; readfd(f, b+1, 2); num = IVAL(b, 0); } else num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr; } else num = UVAL(b, 0) + *prev_ptr; *prev_ptr = num; if (prev_ptr == &prev_negative) num = -num; return num; } /* 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 f, char *buf, size_t bufsiz) { bufsiz--; /* leave room for the null */ while (bufsiz > 0) { buf[0] = 0; read_buf(f, buf, 1); if (buf[0] == 0) return 0; if (buf[0] == '\n') break; if (buf[0] != '\r') { buf++; bufsiz--; } } *buf = '\0'; return bufsiz > 0; } void io_printf(int fd, const char *format, ...) { va_list ap; char buf[BIGPATHBUFLEN]; int len; va_start(ap, format); len = vsnprintf(buf, sizeof buf, format, ap); va_end(ap); if (len < 0) exit_cleanup(RERR_STREAMIO); if (len > (int)sizeof buf) { rprintf(FERROR, "io_printf() was too long for the buffer.\n"); exit_cleanup(RERR_STREAMIO); } write_sbuf(fd, buf); } /** Setup for multiplexing a MSG_* stream with the data stream. */ void io_start_multiplex_out(void) { io_flush(NORMAL_FLUSH); io_start_buffering_out(sock_f_out); io_multiplexing_out = 1; } /** 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; } /** Write an message to the multiplexed data stream. */ int io_multiplex_write(enum msgcode code, const char *buf, size_t len, int convert) { 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; } void io_end_multiplex_in(void) { io_multiplexing_in = 0; io_end_buffering_in(); } /** Stop output multiplexing. */ void io_end_multiplex_out(void) { io_multiplexing_out = 0; io_end_buffering_out(); } void start_write_batch(int 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); if (protocol_version >= 30) write_byte(batch_fd, compat_flags); 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; }