Annotation of embedaddon/rsync/io.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Socket and pipe I/O utilities used in rsync.
! 3: *
! 4: * Copyright (C) 1996-2001 Andrew Tridgell
! 5: * Copyright (C) 1996 Paul Mackerras
! 6: * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
! 7: * Copyright (C) 2003-2009 Wayne Davison
! 8: *
! 9: * This program is free software; you can redistribute it and/or modify
! 10: * it under the terms of the GNU General Public License as published by
! 11: * the Free Software Foundation; either version 3 of the License, or
! 12: * (at your option) any later version.
! 13: *
! 14: * This program is distributed in the hope that it will be useful,
! 15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
! 16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 17: * GNU General Public License for more details.
! 18: *
! 19: * You should have received a copy of the GNU General Public License along
! 20: * with this program; if not, visit the http://fsf.org website.
! 21: */
! 22:
! 23: /* Rsync provides its own multiplexing system, which is used to send
! 24: * stderr and stdout over a single socket.
! 25: *
! 26: * For historical reasons this is off during the start of the
! 27: * connection, but it's switched on quite early using
! 28: * io_start_multiplex_out() and io_start_multiplex_in(). */
! 29:
! 30: #include "rsync.h"
! 31: #include "ifuncs.h"
! 32:
! 33: /** If no timeout is specified then use a 60 second select timeout */
! 34: #define SELECT_TIMEOUT 60
! 35:
! 36: extern int bwlimit;
! 37: extern size_t bwlimit_writemax;
! 38: extern int io_timeout;
! 39: extern int am_server;
! 40: extern int am_daemon;
! 41: extern int am_sender;
! 42: extern int am_generator;
! 43: extern int inc_recurse;
! 44: extern int io_error;
! 45: extern int eol_nulls;
! 46: extern int flist_eof;
! 47: extern int list_only;
! 48: extern int read_batch;
! 49: extern int compat_flags;
! 50: extern int protect_args;
! 51: extern int checksum_seed;
! 52: extern int protocol_version;
! 53: extern int remove_source_files;
! 54: extern int preserve_hard_links;
! 55: extern struct stats stats;
! 56: extern struct file_list *cur_flist;
! 57: #ifdef ICONV_OPTION
! 58: extern int filesfrom_convert;
! 59: extern iconv_t ic_send, ic_recv;
! 60: #endif
! 61:
! 62: int csum_length = SHORT_SUM_LENGTH; /* initial value */
! 63: int allowed_lull = 0;
! 64: int ignore_timeout = 0;
! 65: int batch_fd = -1;
! 66: int msgdone_cnt = 0;
! 67:
! 68: /* Ignore an EOF error if non-zero. See whine_about_eof(). */
! 69: int kluge_around_eof = 0;
! 70:
! 71: int msg_fd_in = -1;
! 72: int msg_fd_out = -1;
! 73: int sock_f_in = -1;
! 74: int sock_f_out = -1;
! 75:
! 76: static int iobuf_f_in = -1;
! 77: static char *iobuf_in;
! 78: static size_t iobuf_in_siz;
! 79: static size_t iobuf_in_ndx;
! 80: static size_t iobuf_in_remaining;
! 81:
! 82: static int iobuf_f_out = -1;
! 83: static char *iobuf_out;
! 84: static int iobuf_out_cnt;
! 85:
! 86: int flist_forward_from = -1;
! 87:
! 88: static int io_multiplexing_out;
! 89: static int io_multiplexing_in;
! 90: static time_t last_io_in;
! 91: static time_t last_io_out;
! 92: static int no_flush;
! 93:
! 94: static int write_batch_monitor_in = -1;
! 95: static int write_batch_monitor_out = -1;
! 96:
! 97: static int io_filesfrom_f_in = -1;
! 98: static int io_filesfrom_f_out = -1;
! 99: static xbuf ff_buf = EMPTY_XBUF;
! 100: static char ff_lastchar;
! 101: #ifdef ICONV_OPTION
! 102: static xbuf iconv_buf = EMPTY_XBUF;
! 103: #endif
! 104: static int defer_forwarding_messages = 0, keep_defer_forwarding = 0;
! 105: static int select_timeout = SELECT_TIMEOUT;
! 106: static int active_filecnt = 0;
! 107: static OFF_T active_bytecnt = 0;
! 108: static int first_message = 1;
! 109:
! 110: static char int_byte_extra[64] = {
! 111: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */
! 112: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */
! 113: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */
! 114: 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */
! 115: };
! 116:
! 117: #define REMOTE_OPTION_ERROR "rsync: on remote machine: -"
! 118: #define REMOTE_OPTION_ERROR2 ": unknown option"
! 119:
! 120: enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND };
! 121:
! 122: static void check_timeout(void)
! 123: {
! 124: time_t t, chk;
! 125:
! 126: if (!io_timeout || ignore_timeout)
! 127: return;
! 128:
! 129: t = time(NULL);
! 130:
! 131: if (!last_io_in)
! 132: last_io_in = t;
! 133:
! 134: chk = MAX(last_io_out, last_io_in);
! 135: if (t - chk >= io_timeout) {
! 136: if (am_server || am_daemon)
! 137: exit_cleanup(RERR_TIMEOUT);
! 138: rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n",
! 139: who_am_i(), (int)(t-chk));
! 140: exit_cleanup(RERR_TIMEOUT);
! 141: }
! 142: }
! 143:
! 144: static void readfd(int fd, char *buffer, size_t N);
! 145: static void writefd(int fd, const char *buf, size_t len);
! 146: static void writefd_unbuffered(int fd, const char *buf, size_t len);
! 147: static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert);
! 148:
! 149: static flist_ndx_list redo_list, hlink_list;
! 150:
! 151: struct msg_list_item {
! 152: struct msg_list_item *next;
! 153: char convert;
! 154: char buf[1];
! 155: };
! 156:
! 157: struct msg_list {
! 158: struct msg_list_item *head, *tail;
! 159: };
! 160:
! 161: static struct msg_list msg_queue;
! 162:
! 163: static void got_flist_entry_status(enum festatus status, const char *buf)
! 164: {
! 165: int ndx = IVAL(buf, 0);
! 166: struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status");
! 167:
! 168: if (remove_source_files) {
! 169: active_filecnt--;
! 170: active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]);
! 171: }
! 172:
! 173: if (inc_recurse)
! 174: flist->in_progress--;
! 175:
! 176: switch (status) {
! 177: case FES_SUCCESS:
! 178: if (remove_source_files)
! 179: send_msg(MSG_SUCCESS, buf, 4, 0);
! 180: /* FALL THROUGH */
! 181: case FES_NO_SEND:
! 182: #ifdef SUPPORT_HARD_LINKS
! 183: if (preserve_hard_links) {
! 184: struct file_struct *file = flist->files[ndx - flist->ndx_start];
! 185: if (F_IS_HLINKED(file)) {
! 186: if (status == FES_NO_SEND)
! 187: flist_ndx_push(&hlink_list, -2); /* indicates a failure follows */
! 188: flist_ndx_push(&hlink_list, ndx);
! 189: flist->in_progress++;
! 190: }
! 191: }
! 192: #endif
! 193: break;
! 194: case FES_REDO:
! 195: if (read_batch) {
! 196: if (inc_recurse)
! 197: flist->in_progress++;
! 198: break;
! 199: }
! 200: if (inc_recurse)
! 201: flist->to_redo++;
! 202: flist_ndx_push(&redo_list, ndx);
! 203: break;
! 204: }
! 205: }
! 206:
! 207: /* Note the fds used for the main socket (which might really be a pipe
! 208: * for a local transfer, but we can ignore that). */
! 209: void io_set_sock_fds(int f_in, int f_out)
! 210: {
! 211: sock_f_in = f_in;
! 212: sock_f_out = f_out;
! 213: }
! 214:
! 215: void set_io_timeout(int secs)
! 216: {
! 217: io_timeout = secs;
! 218: allowed_lull = (io_timeout + 1) / 2;
! 219:
! 220: if (!io_timeout || allowed_lull > SELECT_TIMEOUT)
! 221: select_timeout = SELECT_TIMEOUT;
! 222: else
! 223: select_timeout = allowed_lull;
! 224:
! 225: if (read_batch)
! 226: allowed_lull = 0;
! 227: }
! 228:
! 229: /* Setup the fd used to receive MSG_* messages. Only needed during the
! 230: * early stages of being a local sender (up through the sending of the
! 231: * file list) or when we're the generator (to fetch the messages from
! 232: * the receiver). */
! 233: void set_msg_fd_in(int fd)
! 234: {
! 235: msg_fd_in = fd;
! 236: }
! 237:
! 238: /* Setup the fd used to send our MSG_* messages. Only needed when
! 239: * we're the receiver (to send our messages to the generator). */
! 240: void set_msg_fd_out(int fd)
! 241: {
! 242: msg_fd_out = fd;
! 243: set_nonblocking(msg_fd_out);
! 244: }
! 245:
! 246: /* Add a message to the pending MSG_* list. */
! 247: static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert)
! 248: {
! 249: struct msg_list_item *m;
! 250: int sz = len + 4 + sizeof m[0] - 1;
! 251:
! 252: if (!(m = (struct msg_list_item *)new_array(char, sz)))
! 253: out_of_memory("msg_list_add");
! 254: m->next = NULL;
! 255: m->convert = convert;
! 256: SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len);
! 257: memcpy(m->buf + 4, buf, len);
! 258: if (lst->tail)
! 259: lst->tail->next = m;
! 260: else
! 261: lst->head = m;
! 262: lst->tail = m;
! 263: }
! 264:
! 265: static inline int flush_a_msg(int fd)
! 266: {
! 267: struct msg_list_item *m = msg_queue.head;
! 268: int len = IVAL(m->buf, 0) & 0xFFFFFF;
! 269: int tag = *((uchar*)m->buf+3) - MPLEX_BASE;
! 270:
! 271: if (!(msg_queue.head = m->next))
! 272: msg_queue.tail = NULL;
! 273:
! 274: defer_forwarding_messages++;
! 275: mplex_write(fd, tag, m->buf + 4, len, m->convert);
! 276: defer_forwarding_messages--;
! 277:
! 278: free(m);
! 279:
! 280: return len;
! 281: }
! 282:
! 283: static void msg_flush(void)
! 284: {
! 285: if (am_generator) {
! 286: while (msg_queue.head && io_multiplexing_out)
! 287: stats.total_written += flush_a_msg(sock_f_out) + 4;
! 288: } else {
! 289: while (msg_queue.head)
! 290: (void)flush_a_msg(msg_fd_out);
! 291: }
! 292: }
! 293:
! 294: static void check_for_d_option_error(const char *msg)
! 295: {
! 296: static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz";
! 297: char *colon;
! 298: int saw_d = 0;
! 299:
! 300: if (*msg != 'r'
! 301: || strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0)
! 302: return;
! 303:
! 304: msg += sizeof REMOTE_OPTION_ERROR - 1;
! 305: if (*msg == '-' || (colon = strchr(msg, ':')) == NULL
! 306: || strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0)
! 307: return;
! 308:
! 309: for ( ; *msg != ':'; msg++) {
! 310: if (*msg == 'd')
! 311: saw_d = 1;
! 312: else if (*msg == 'e')
! 313: break;
! 314: else if (strchr(rsync263_opts, *msg) == NULL)
! 315: return;
! 316: }
! 317:
! 318: if (saw_d) {
! 319: rprintf(FWARNING,
! 320: "*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n");
! 321: }
! 322: }
! 323:
! 324: /* Read a message from the MSG_* fd and handle it. This is called either
! 325: * during the early stages of being a local sender (up through the sending
! 326: * of the file list) or when we're the generator (to fetch the messages
! 327: * from the receiver). */
! 328: static void read_msg_fd(void)
! 329: {
! 330: char buf[2048];
! 331: size_t n;
! 332: struct file_list *flist;
! 333: int fd = msg_fd_in;
! 334: int tag, len;
! 335:
! 336: /* Temporarily disable msg_fd_in. This is needed to avoid looping back
! 337: * to this routine from writefd_unbuffered(). */
! 338: no_flush++;
! 339: msg_fd_in = -1;
! 340: defer_forwarding_messages++;
! 341:
! 342: readfd(fd, buf, 4);
! 343: tag = IVAL(buf, 0);
! 344:
! 345: len = tag & 0xFFFFFF;
! 346: tag = (tag >> 24) - MPLEX_BASE;
! 347:
! 348: switch (tag) {
! 349: case MSG_DONE:
! 350: if (len < 0 || len > 1 || !am_generator) {
! 351: invalid_msg:
! 352: rprintf(FERROR, "invalid message %d:%d [%s%s]\n",
! 353: tag, len, who_am_i(),
! 354: inc_recurse ? "/inc" : "");
! 355: exit_cleanup(RERR_STREAMIO);
! 356: }
! 357: if (len) {
! 358: readfd(fd, buf, len);
! 359: stats.total_read = read_varlong(fd, 3);
! 360: }
! 361: msgdone_cnt++;
! 362: break;
! 363: case MSG_REDO:
! 364: if (len != 4 || !am_generator)
! 365: goto invalid_msg;
! 366: readfd(fd, buf, 4);
! 367: got_flist_entry_status(FES_REDO, buf);
! 368: break;
! 369: case MSG_FLIST:
! 370: if (len != 4 || !am_generator || !inc_recurse)
! 371: goto invalid_msg;
! 372: readfd(fd, buf, 4);
! 373: /* Read extra file list from receiver. */
! 374: assert(iobuf_in != NULL);
! 375: assert(iobuf_f_in == fd);
! 376: if (verbose > 3) {
! 377: rprintf(FINFO, "[%s] receiving flist for dir %d\n",
! 378: who_am_i(), IVAL(buf,0));
! 379: }
! 380: flist = recv_file_list(fd);
! 381: flist->parent_ndx = IVAL(buf,0);
! 382: #ifdef SUPPORT_HARD_LINKS
! 383: if (preserve_hard_links)
! 384: match_hard_links(flist);
! 385: #endif
! 386: break;
! 387: case MSG_FLIST_EOF:
! 388: if (len != 0 || !am_generator || !inc_recurse)
! 389: goto invalid_msg;
! 390: flist_eof = 1;
! 391: break;
! 392: case MSG_IO_ERROR:
! 393: if (len != 4)
! 394: goto invalid_msg;
! 395: readfd(fd, buf, len);
! 396: io_error |= IVAL(buf, 0);
! 397: break;
! 398: case MSG_DELETED:
! 399: if (len >= (int)sizeof buf || !am_generator)
! 400: goto invalid_msg;
! 401: readfd(fd, buf, len);
! 402: send_msg(MSG_DELETED, buf, len, 1);
! 403: break;
! 404: case MSG_SUCCESS:
! 405: if (len != 4 || !am_generator)
! 406: goto invalid_msg;
! 407: readfd(fd, buf, 4);
! 408: got_flist_entry_status(FES_SUCCESS, buf);
! 409: break;
! 410: case MSG_NO_SEND:
! 411: if (len != 4 || !am_generator)
! 412: goto invalid_msg;
! 413: readfd(fd, buf, 4);
! 414: got_flist_entry_status(FES_NO_SEND, buf);
! 415: break;
! 416: case MSG_ERROR_SOCKET:
! 417: case MSG_ERROR_UTF8:
! 418: case MSG_CLIENT:
! 419: if (!am_generator)
! 420: goto invalid_msg;
! 421: if (tag == MSG_ERROR_SOCKET)
! 422: io_end_multiplex_out();
! 423: /* FALL THROUGH */
! 424: case MSG_INFO:
! 425: case MSG_ERROR:
! 426: case MSG_ERROR_XFER:
! 427: case MSG_WARNING:
! 428: case MSG_LOG:
! 429: while (len) {
! 430: n = len;
! 431: if (n >= sizeof buf)
! 432: n = sizeof buf - 1;
! 433: readfd(fd, buf, n);
! 434: rwrite((enum logcode)tag, buf, n, !am_generator);
! 435: len -= n;
! 436: }
! 437: break;
! 438: default:
! 439: rprintf(FERROR, "unknown message %d:%d [%s]\n",
! 440: tag, len, who_am_i());
! 441: exit_cleanup(RERR_STREAMIO);
! 442: }
! 443:
! 444: no_flush--;
! 445: msg_fd_in = fd;
! 446: if (!--defer_forwarding_messages && !no_flush)
! 447: msg_flush();
! 448: }
! 449:
! 450: /* This is used by the generator to limit how many file transfers can
! 451: * be active at once when --remove-source-files is specified. Without
! 452: * this, sender-side deletions were mostly happening at the end. */
! 453: void increment_active_files(int ndx, int itemizing, enum logcode code)
! 454: {
! 455: while (1) {
! 456: /* TODO: tune these limits? */
! 457: int limit = active_bytecnt >= 128*1024 ? 10 : 50;
! 458: if (active_filecnt < limit)
! 459: break;
! 460: check_for_finished_files(itemizing, code, 0);
! 461: if (active_filecnt < limit)
! 462: break;
! 463: if (iobuf_out_cnt)
! 464: io_flush(NORMAL_FLUSH);
! 465: else
! 466: read_msg_fd();
! 467: }
! 468:
! 469: active_filecnt++;
! 470: active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]);
! 471: }
! 472:
! 473: /* Write an message to a multiplexed stream. If this fails, rsync exits. */
! 474: static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert)
! 475: {
! 476: char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */
! 477: size_t n = len;
! 478:
! 479: #ifdef ICONV_OPTION
! 480: /* We need to convert buf before doing anything else so that we
! 481: * can include the (converted) byte length in the message header. */
! 482: if (convert && ic_send != (iconv_t)-1) {
! 483: xbuf outbuf, inbuf;
! 484:
! 485: INIT_XBUF(outbuf, buffer + 4, 0, sizeof buffer - 4);
! 486: INIT_XBUF(inbuf, (char*)buf, len, -1);
! 487:
! 488: iconvbufs(ic_send, &inbuf, &outbuf,
! 489: ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
! 490: if (inbuf.len > 0) {
! 491: rprintf(FERROR, "overflowed conversion buffer in mplex_write");
! 492: exit_cleanup(RERR_UNSUPPORTED);
! 493: }
! 494:
! 495: n = len = outbuf.len;
! 496: } else
! 497: #endif
! 498: if (n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */
! 499: n = 0; /* We'd rather do 2 writes than too much memcpy(). */
! 500: else
! 501: memcpy(buffer + 4, buf, n);
! 502:
! 503: SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
! 504:
! 505: keep_defer_forwarding++; /* defer_forwarding_messages++ on return */
! 506: writefd_unbuffered(fd, buffer, n+4);
! 507: keep_defer_forwarding--;
! 508:
! 509: if (len > n)
! 510: writefd_unbuffered(fd, buf+n, len-n);
! 511:
! 512: if (!--defer_forwarding_messages && !no_flush)
! 513: msg_flush();
! 514: }
! 515:
! 516: int send_msg(enum msgcode code, const char *buf, int len, int convert)
! 517: {
! 518: if (msg_fd_out < 0) {
! 519: if (!defer_forwarding_messages)
! 520: return io_multiplex_write(code, buf, len, convert);
! 521: if (!io_multiplexing_out)
! 522: return 0;
! 523: msg_list_add(&msg_queue, code, buf, len, convert);
! 524: return 1;
! 525: }
! 526: if (flist_forward_from >= 0)
! 527: msg_list_add(&msg_queue, code, buf, len, convert);
! 528: else
! 529: mplex_write(msg_fd_out, code, buf, len, convert);
! 530: return 1;
! 531: }
! 532:
! 533: void send_msg_int(enum msgcode code, int num)
! 534: {
! 535: char numbuf[4];
! 536: SIVAL(numbuf, 0, num);
! 537: send_msg(code, numbuf, 4, 0);
! 538: }
! 539:
! 540: void wait_for_receiver(void)
! 541: {
! 542: if (io_flush(NORMAL_FLUSH))
! 543: return;
! 544: read_msg_fd();
! 545: }
! 546:
! 547: int get_redo_num(void)
! 548: {
! 549: return flist_ndx_pop(&redo_list);
! 550: }
! 551:
! 552: int get_hlink_num(void)
! 553: {
! 554: return flist_ndx_pop(&hlink_list);
! 555: }
! 556:
! 557: /**
! 558: * When we're the receiver and we have a local --files-from list of names
! 559: * that needs to be sent over the socket to the sender, we have to do two
! 560: * things at the same time: send the sender a list of what files we're
! 561: * processing and read the incoming file+info list from the sender. We do
! 562: * this by augmenting the read_timeout() function to copy this data. It
! 563: * uses ff_buf to read a block of data from f_in (when it is ready, since
! 564: * it might be a pipe) and then blast it out f_out (when it is ready to
! 565: * receive more data).
! 566: */
! 567: void io_set_filesfrom_fds(int f_in, int f_out)
! 568: {
! 569: io_filesfrom_f_in = f_in;
! 570: io_filesfrom_f_out = f_out;
! 571: alloc_xbuf(&ff_buf, 2048);
! 572: #ifdef ICONV_OPTION
! 573: if (protect_args)
! 574: alloc_xbuf(&iconv_buf, 1024);
! 575: #endif
! 576: }
! 577:
! 578: /* It's almost always an error to get an EOF when we're trying to read from the
! 579: * network, because the protocol is (for the most part) self-terminating.
! 580: *
! 581: * There is one case for the receiver when it is at the end of the transfer
! 582: * (hanging around reading any keep-alive packets that might come its way): if
! 583: * the sender dies before the generator's kill-signal comes through, we can end
! 584: * up here needing to loop until the kill-signal arrives. In this situation,
! 585: * kluge_around_eof will be < 0.
! 586: *
! 587: * There is another case for older protocol versions (< 24) where the module
! 588: * listing was not terminated, so we must ignore an EOF error in that case and
! 589: * exit. In this situation, kluge_around_eof will be > 0. */
! 590: static void whine_about_eof(int fd)
! 591: {
! 592: if (kluge_around_eof && fd == sock_f_in) {
! 593: int i;
! 594: if (kluge_around_eof > 0)
! 595: exit_cleanup(0);
! 596: /* If we're still here after 10 seconds, exit with an error. */
! 597: for (i = 10*1000/20; i--; )
! 598: msleep(20);
! 599: }
! 600:
! 601: rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
! 602: "(%.0f bytes received so far) [%s]\n",
! 603: (double)stats.total_read, who_am_i());
! 604:
! 605: exit_cleanup(RERR_STREAMIO);
! 606: }
! 607:
! 608: /**
! 609: * Read from a socket with I/O timeout. return the number of bytes
! 610: * read. If no bytes can be read then exit, never return a number <= 0.
! 611: *
! 612: * TODO: If the remote shell connection fails, then current versions
! 613: * actually report an "unexpected EOF" error here. Since it's a
! 614: * fairly common mistake to try to use rsh when ssh is required, we
! 615: * should trap that: if we fail to read any data at all, we should
! 616: * give a better explanation. We can tell whether the connection has
! 617: * started by looking e.g. at whether the remote version is known yet.
! 618: */
! 619: static int read_timeout(int fd, char *buf, size_t len)
! 620: {
! 621: int n, cnt = 0;
! 622:
! 623: io_flush(FULL_FLUSH);
! 624:
! 625: while (cnt == 0) {
! 626: /* until we manage to read *something* */
! 627: fd_set r_fds, w_fds;
! 628: struct timeval tv;
! 629: int maxfd = fd;
! 630: int count;
! 631:
! 632: FD_ZERO(&r_fds);
! 633: FD_ZERO(&w_fds);
! 634: FD_SET(fd, &r_fds);
! 635: if (io_filesfrom_f_out >= 0) {
! 636: int new_fd;
! 637: if (ff_buf.len == 0) {
! 638: if (io_filesfrom_f_in >= 0) {
! 639: FD_SET(io_filesfrom_f_in, &r_fds);
! 640: new_fd = io_filesfrom_f_in;
! 641: } else {
! 642: io_filesfrom_f_out = -1;
! 643: new_fd = -1;
! 644: }
! 645: } else {
! 646: FD_SET(io_filesfrom_f_out, &w_fds);
! 647: new_fd = io_filesfrom_f_out;
! 648: }
! 649: if (new_fd > maxfd)
! 650: maxfd = new_fd;
! 651: }
! 652:
! 653: tv.tv_sec = select_timeout;
! 654: tv.tv_usec = 0;
! 655:
! 656: errno = 0;
! 657:
! 658: count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
! 659:
! 660: if (count <= 0) {
! 661: if (errno == EBADF) {
! 662: defer_forwarding_messages = 0;
! 663: exit_cleanup(RERR_SOCKETIO);
! 664: }
! 665: check_timeout();
! 666: continue;
! 667: }
! 668:
! 669: if (io_filesfrom_f_out >= 0) {
! 670: if (ff_buf.len) {
! 671: if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {
! 672: int l = write(io_filesfrom_f_out,
! 673: ff_buf.buf + ff_buf.pos,
! 674: ff_buf.len);
! 675: if (l > 0) {
! 676: if (!(ff_buf.len -= l))
! 677: ff_buf.pos = 0;
! 678: else
! 679: ff_buf.pos += l;
! 680: } else if (errno != EINTR) {
! 681: /* XXX should we complain? */
! 682: io_filesfrom_f_out = -1;
! 683: }
! 684: }
! 685: } else if (io_filesfrom_f_in >= 0) {
! 686: if (FD_ISSET(io_filesfrom_f_in, &r_fds)) {
! 687: #ifdef ICONV_OPTION
! 688: xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf;
! 689: #else
! 690: xbuf *ibuf = &ff_buf;
! 691: #endif
! 692: int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size);
! 693: if (l <= 0) {
! 694: if (l == 0 || errno != EINTR) {
! 695: /* Send end-of-file marker */
! 696: memcpy(ff_buf.buf, "\0\0", 2);
! 697: ff_buf.len = ff_lastchar? 2 : 1;
! 698: ff_buf.pos = 0;
! 699: io_filesfrom_f_in = -1;
! 700: }
! 701: } else {
! 702: #ifdef ICONV_OPTION
! 703: if (filesfrom_convert) {
! 704: iconv_buf.pos = 0;
! 705: iconv_buf.len = l;
! 706: iconvbufs(ic_send, &iconv_buf, &ff_buf,
! 707: ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE);
! 708: l = ff_buf.len;
! 709: }
! 710: #endif
! 711: if (!eol_nulls) {
! 712: char *s = ff_buf.buf + l;
! 713: /* Transform CR and/or LF into '\0' */
! 714: while (s-- > ff_buf.buf) {
! 715: if (*s == '\n' || *s == '\r')
! 716: *s = '\0';
! 717: }
! 718: }
! 719: if (!ff_lastchar) {
! 720: /* Last buf ended with a '\0', so don't
! 721: * let this buf start with one. */
! 722: while (l && ff_buf.buf[ff_buf.pos] == '\0')
! 723: ff_buf.pos++, l--;
! 724: }
! 725: if (!l)
! 726: ff_buf.pos = 0;
! 727: else {
! 728: char *f = ff_buf.buf + ff_buf.pos;
! 729: char *t = f;
! 730: char *eob = f + l;
! 731: /* Eliminate any multi-'\0' runs. */
! 732: while (f != eob) {
! 733: if (!(*t++ = *f++)) {
! 734: while (f != eob && !*f)
! 735: f++, l--;
! 736: }
! 737: }
! 738: ff_lastchar = f[-1];
! 739: }
! 740: ff_buf.len = l;
! 741: }
! 742: }
! 743: }
! 744: }
! 745:
! 746: if (!FD_ISSET(fd, &r_fds))
! 747: continue;
! 748:
! 749: n = read(fd, buf, len);
! 750:
! 751: if (n <= 0) {
! 752: if (n == 0)
! 753: whine_about_eof(fd); /* Doesn't return. */
! 754: if (errno == EINTR || errno == EWOULDBLOCK
! 755: || errno == EAGAIN)
! 756: continue;
! 757:
! 758: /* Don't write errors on a dead socket. */
! 759: if (fd == sock_f_in) {
! 760: io_end_multiplex_out();
! 761: rsyserr(FERROR_SOCKET, errno, "read error");
! 762: } else
! 763: rsyserr(FERROR, errno, "read error");
! 764: exit_cleanup(RERR_STREAMIO);
! 765: }
! 766:
! 767: buf += n;
! 768: len -= n;
! 769: cnt += n;
! 770:
! 771: if (fd == sock_f_in && io_timeout)
! 772: last_io_in = time(NULL);
! 773: }
! 774:
! 775: return cnt;
! 776: }
! 777:
! 778: /* Read a line into the "buf" buffer. */
! 779: int read_line(int fd, char *buf, size_t bufsiz, int flags)
! 780: {
! 781: char ch, *s, *eob;
! 782: int cnt;
! 783:
! 784: #ifdef ICONV_OPTION
! 785: if (flags & RL_CONVERT && iconv_buf.size < bufsiz)
! 786: realloc_xbuf(&iconv_buf, bufsiz + 1024);
! 787: #endif
! 788:
! 789: start:
! 790: #ifdef ICONV_OPTION
! 791: s = flags & RL_CONVERT ? iconv_buf.buf : buf;
! 792: #else
! 793: s = buf;
! 794: #endif
! 795: eob = s + bufsiz - 1;
! 796: while (1) {
! 797: cnt = read(fd, &ch, 1);
! 798: if (cnt < 0 && (errno == EWOULDBLOCK
! 799: || errno == EINTR || errno == EAGAIN)) {
! 800: struct timeval tv;
! 801: fd_set r_fds, e_fds;
! 802: FD_ZERO(&r_fds);
! 803: FD_SET(fd, &r_fds);
! 804: FD_ZERO(&e_fds);
! 805: FD_SET(fd, &e_fds);
! 806: tv.tv_sec = select_timeout;
! 807: tv.tv_usec = 0;
! 808: if (!select(fd+1, &r_fds, NULL, &e_fds, &tv))
! 809: check_timeout();
! 810: /*if (FD_ISSET(fd, &e_fds))
! 811: rprintf(FINFO, "select exception on fd %d\n", fd); */
! 812: continue;
! 813: }
! 814: if (cnt != 1)
! 815: break;
! 816: if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) {
! 817: /* Skip empty lines if dumping comments. */
! 818: if (flags & RL_DUMP_COMMENTS && s == buf)
! 819: continue;
! 820: break;
! 821: }
! 822: if (s < eob)
! 823: *s++ = ch;
! 824: }
! 825: *s = '\0';
! 826:
! 827: if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';'))
! 828: goto start;
! 829:
! 830: #ifdef ICONV_OPTION
! 831: if (flags & RL_CONVERT) {
! 832: xbuf outbuf;
! 833: INIT_XBUF(outbuf, buf, 0, bufsiz);
! 834: iconv_buf.pos = 0;
! 835: iconv_buf.len = s - iconv_buf.buf;
! 836: iconvbufs(ic_recv, &iconv_buf, &outbuf,
! 837: ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
! 838: outbuf.buf[outbuf.len] = '\0';
! 839: return outbuf.len;
! 840: }
! 841: #endif
! 842:
! 843: return s - buf;
! 844: }
! 845:
! 846: void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls,
! 847: char ***argv_p, int *argc_p, char **request_p)
! 848: {
! 849: int maxargs = MAX_ARGS;
! 850: int dot_pos = 0;
! 851: int argc = 0;
! 852: char **argv, *p;
! 853: int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0);
! 854:
! 855: #ifdef ICONV_OPTION
! 856: rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0);
! 857: #endif
! 858:
! 859: if (!(argv = new_array(char *, maxargs)))
! 860: out_of_memory("read_args");
! 861: if (mod_name && !protect_args)
! 862: argv[argc++] = "rsyncd";
! 863:
! 864: while (1) {
! 865: if (read_line(f_in, buf, bufsiz, rl_flags) == 0)
! 866: break;
! 867:
! 868: if (argc == maxargs-1) {
! 869: maxargs += MAX_ARGS;
! 870: if (!(argv = realloc_array(argv, char *, maxargs)))
! 871: out_of_memory("read_args");
! 872: }
! 873:
! 874: if (dot_pos) {
! 875: if (request_p) {
! 876: *request_p = strdup(buf);
! 877: request_p = NULL;
! 878: }
! 879: if (mod_name)
! 880: glob_expand_module(mod_name, buf, &argv, &argc, &maxargs);
! 881: else
! 882: glob_expand(buf, &argv, &argc, &maxargs);
! 883: } else {
! 884: if (!(p = strdup(buf)))
! 885: out_of_memory("read_args");
! 886: argv[argc++] = p;
! 887: if (*p == '.' && p[1] == '\0')
! 888: dot_pos = argc;
! 889: }
! 890: }
! 891: argv[argc] = NULL;
! 892:
! 893: glob_expand(NULL, NULL, NULL, NULL);
! 894:
! 895: *argc_p = argc;
! 896: *argv_p = argv;
! 897: }
! 898:
! 899: int io_start_buffering_out(int f_out)
! 900: {
! 901: if (iobuf_out) {
! 902: assert(f_out == iobuf_f_out);
! 903: return 0;
! 904: }
! 905: if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE)))
! 906: out_of_memory("io_start_buffering_out");
! 907: iobuf_out_cnt = 0;
! 908: iobuf_f_out = f_out;
! 909: return 1;
! 910: }
! 911:
! 912: int io_start_buffering_in(int f_in)
! 913: {
! 914: if (iobuf_in) {
! 915: assert(f_in == iobuf_f_in);
! 916: return 0;
! 917: }
! 918: iobuf_in_siz = 2 * IO_BUFFER_SIZE;
! 919: if (!(iobuf_in = new_array(char, iobuf_in_siz)))
! 920: out_of_memory("io_start_buffering_in");
! 921: iobuf_f_in = f_in;
! 922: return 1;
! 923: }
! 924:
! 925: void io_end_buffering_in(void)
! 926: {
! 927: if (!iobuf_in)
! 928: return;
! 929: free(iobuf_in);
! 930: iobuf_in = NULL;
! 931: iobuf_in_ndx = 0;
! 932: iobuf_in_remaining = 0;
! 933: iobuf_f_in = -1;
! 934: }
! 935:
! 936: void io_end_buffering_out(void)
! 937: {
! 938: if (!iobuf_out)
! 939: return;
! 940: io_flush(FULL_FLUSH);
! 941: free(iobuf_out);
! 942: iobuf_out = NULL;
! 943: iobuf_f_out = -1;
! 944: }
! 945:
! 946: void maybe_flush_socket(int important)
! 947: {
! 948: if (iobuf_out && iobuf_out_cnt
! 949: && (important || time(NULL) - last_io_out >= 5))
! 950: io_flush(NORMAL_FLUSH);
! 951: }
! 952:
! 953: void maybe_send_keepalive(void)
! 954: {
! 955: if (time(NULL) - last_io_out >= allowed_lull) {
! 956: if (!iobuf_out || !iobuf_out_cnt) {
! 957: if (protocol_version < 29)
! 958: send_msg(MSG_DATA, "", 0, 0);
! 959: else if (protocol_version >= 30)
! 960: send_msg(MSG_NOOP, "", 0, 0);
! 961: else {
! 962: write_int(sock_f_out, cur_flist->used);
! 963: write_shortint(sock_f_out, ITEM_IS_NEW);
! 964: }
! 965: }
! 966: if (iobuf_out)
! 967: io_flush(NORMAL_FLUSH);
! 968: }
! 969: }
! 970:
! 971: void start_flist_forward(int f_in)
! 972: {
! 973: assert(iobuf_out != NULL);
! 974: assert(iobuf_f_out == msg_fd_out);
! 975: flist_forward_from = f_in;
! 976: defer_forwarding_messages++;
! 977: }
! 978:
! 979: void stop_flist_forward(void)
! 980: {
! 981: flist_forward_from = -1;
! 982: defer_forwarding_messages--;
! 983: io_flush(FULL_FLUSH);
! 984: }
! 985:
! 986: /**
! 987: * Continue trying to read len bytes - don't return until len has been
! 988: * read.
! 989: **/
! 990: static void read_loop(int fd, char *buf, size_t len)
! 991: {
! 992: while (len) {
! 993: int n = read_timeout(fd, buf, len);
! 994:
! 995: buf += n;
! 996: len -= n;
! 997: }
! 998: }
! 999:
! 1000: /**
! 1001: * Read from the file descriptor handling multiplexing - return number
! 1002: * of bytes read.
! 1003: *
! 1004: * Never returns <= 0.
! 1005: */
! 1006: static int readfd_unbuffered(int fd, char *buf, size_t len)
! 1007: {
! 1008: size_t msg_bytes;
! 1009: int tag, cnt = 0;
! 1010: char line[BIGPATHBUFLEN];
! 1011:
! 1012: if (!iobuf_in || fd != iobuf_f_in)
! 1013: return read_timeout(fd, buf, len);
! 1014:
! 1015: if (!io_multiplexing_in && iobuf_in_remaining == 0) {
! 1016: iobuf_in_remaining = read_timeout(fd, iobuf_in, iobuf_in_siz);
! 1017: iobuf_in_ndx = 0;
! 1018: }
! 1019:
! 1020: while (cnt == 0) {
! 1021: if (iobuf_in_remaining) {
! 1022: len = MIN(len, iobuf_in_remaining);
! 1023: memcpy(buf, iobuf_in + iobuf_in_ndx, len);
! 1024: iobuf_in_ndx += len;
! 1025: iobuf_in_remaining -= len;
! 1026: cnt = len;
! 1027: break;
! 1028: }
! 1029:
! 1030: read_loop(fd, line, 4);
! 1031: tag = IVAL(line, 0);
! 1032:
! 1033: msg_bytes = tag & 0xFFFFFF;
! 1034: tag = (tag >> 24) - MPLEX_BASE;
! 1035:
! 1036: switch (tag) {
! 1037: case MSG_DATA:
! 1038: if (msg_bytes > iobuf_in_siz) {
! 1039: if (!(iobuf_in = realloc_array(iobuf_in, char,
! 1040: msg_bytes)))
! 1041: out_of_memory("readfd_unbuffered");
! 1042: iobuf_in_siz = msg_bytes;
! 1043: }
! 1044: read_loop(fd, iobuf_in, msg_bytes);
! 1045: iobuf_in_remaining = msg_bytes;
! 1046: iobuf_in_ndx = 0;
! 1047: break;
! 1048: case MSG_NOOP:
! 1049: if (msg_bytes != 0)
! 1050: goto invalid_msg;
! 1051: if (am_sender)
! 1052: maybe_send_keepalive();
! 1053: break;
! 1054: case MSG_IO_ERROR:
! 1055: if (msg_bytes != 4)
! 1056: goto invalid_msg;
! 1057: read_loop(fd, line, msg_bytes);
! 1058: send_msg_int(MSG_IO_ERROR, IVAL(line, 0));
! 1059: io_error |= IVAL(line, 0);
! 1060: break;
! 1061: case MSG_DELETED:
! 1062: if (msg_bytes >= sizeof line)
! 1063: goto overflow;
! 1064: #ifdef ICONV_OPTION
! 1065: if (ic_recv != (iconv_t)-1) {
! 1066: xbuf outbuf, inbuf;
! 1067: char ibuf[512];
! 1068: int add_null = 0;
! 1069:
! 1070: INIT_CONST_XBUF(outbuf, line);
! 1071: INIT_XBUF(inbuf, ibuf, 0, -1);
! 1072:
! 1073: while (msg_bytes) {
! 1074: inbuf.len = msg_bytes > sizeof ibuf
! 1075: ? sizeof ibuf : msg_bytes;
! 1076: read_loop(fd, inbuf.buf, inbuf.len);
! 1077: if (!(msg_bytes -= inbuf.len)
! 1078: && !ibuf[inbuf.len-1])
! 1079: inbuf.len--, add_null = 1;
! 1080: if (iconvbufs(ic_send, &inbuf, &outbuf,
! 1081: ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE) < 0)
! 1082: goto overflow;
! 1083: }
! 1084: if (add_null) {
! 1085: if (outbuf.len == outbuf.size)
! 1086: goto overflow;
! 1087: outbuf.buf[outbuf.len++] = '\0';
! 1088: }
! 1089: msg_bytes = outbuf.len;
! 1090: } else
! 1091: #endif
! 1092: read_loop(fd, line, msg_bytes);
! 1093: /* A directory name was sent with the trailing null */
! 1094: if (msg_bytes > 0 && !line[msg_bytes-1])
! 1095: log_delete(line, S_IFDIR);
! 1096: else {
! 1097: line[msg_bytes] = '\0';
! 1098: log_delete(line, S_IFREG);
! 1099: }
! 1100: break;
! 1101: case MSG_SUCCESS:
! 1102: if (msg_bytes != 4) {
! 1103: invalid_msg:
! 1104: rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n",
! 1105: tag, (long)msg_bytes, who_am_i());
! 1106: exit_cleanup(RERR_STREAMIO);
! 1107: }
! 1108: read_loop(fd, line, msg_bytes);
! 1109: successful_send(IVAL(line, 0));
! 1110: break;
! 1111: case MSG_NO_SEND:
! 1112: if (msg_bytes != 4)
! 1113: goto invalid_msg;
! 1114: read_loop(fd, line, msg_bytes);
! 1115: send_msg_int(MSG_NO_SEND, IVAL(line, 0));
! 1116: break;
! 1117: case MSG_INFO:
! 1118: case MSG_ERROR:
! 1119: case MSG_ERROR_XFER:
! 1120: case MSG_WARNING:
! 1121: if (msg_bytes >= sizeof line) {
! 1122: overflow:
! 1123: rprintf(FERROR,
! 1124: "multiplexing overflow %d:%ld [%s]\n",
! 1125: tag, (long)msg_bytes, who_am_i());
! 1126: exit_cleanup(RERR_STREAMIO);
! 1127: }
! 1128: read_loop(fd, line, msg_bytes);
! 1129: rwrite((enum logcode)tag, line, msg_bytes, 1);
! 1130: if (first_message) {
! 1131: if (list_only && !am_sender && tag == 1) {
! 1132: line[msg_bytes] = '\0';
! 1133: check_for_d_option_error(line);
! 1134: }
! 1135: first_message = 0;
! 1136: }
! 1137: break;
! 1138: default:
! 1139: rprintf(FERROR, "unexpected tag %d [%s]\n",
! 1140: tag, who_am_i());
! 1141: exit_cleanup(RERR_STREAMIO);
! 1142: }
! 1143: }
! 1144:
! 1145: if (iobuf_in_remaining == 0)
! 1146: io_flush(NORMAL_FLUSH);
! 1147:
! 1148: return cnt;
! 1149: }
! 1150:
! 1151: /* Do a buffered read from fd. Don't return until all N bytes have
! 1152: * been read. If all N can't be read then exit with an error. */
! 1153: static void readfd(int fd, char *buffer, size_t N)
! 1154: {
! 1155: int cnt;
! 1156: size_t total = 0;
! 1157:
! 1158: while (total < N) {
! 1159: cnt = readfd_unbuffered(fd, buffer + total, N-total);
! 1160: total += cnt;
! 1161: }
! 1162:
! 1163: if (fd == write_batch_monitor_in) {
! 1164: if ((size_t)write(batch_fd, buffer, total) != total)
! 1165: exit_cleanup(RERR_FILEIO);
! 1166: }
! 1167:
! 1168: if (fd == flist_forward_from)
! 1169: writefd(iobuf_f_out, buffer, total);
! 1170:
! 1171: if (fd == sock_f_in)
! 1172: stats.total_read += total;
! 1173: }
! 1174:
! 1175: unsigned short read_shortint(int f)
! 1176: {
! 1177: char b[2];
! 1178: readfd(f, b, 2);
! 1179: return (UVAL(b, 1) << 8) + UVAL(b, 0);
! 1180: }
! 1181:
! 1182: int32 read_int(int f)
! 1183: {
! 1184: char b[4];
! 1185: int32 num;
! 1186:
! 1187: readfd(f, b, 4);
! 1188: num = IVAL(b, 0);
! 1189: #if SIZEOF_INT32 > 4
! 1190: if (num & (int32)0x80000000)
! 1191: num |= ~(int32)0xffffffff;
! 1192: #endif
! 1193: return num;
! 1194: }
! 1195:
! 1196: int32 read_varint(int f)
! 1197: {
! 1198: union {
! 1199: char b[5];
! 1200: int32 x;
! 1201: } u;
! 1202: uchar ch;
! 1203: int extra;
! 1204:
! 1205: u.x = 0;
! 1206: readfd(f, (char*)&ch, 1);
! 1207: extra = int_byte_extra[ch / 4];
! 1208: if (extra) {
! 1209: uchar bit = ((uchar)1<<(8-extra));
! 1210: if (extra >= (int)sizeof u.b) {
! 1211: rprintf(FERROR, "Overflow in read_varint()\n");
! 1212: exit_cleanup(RERR_STREAMIO);
! 1213: }
! 1214: readfd(f, u.b, extra);
! 1215: u.b[extra] = ch & (bit-1);
! 1216: } else
! 1217: u.b[0] = ch;
! 1218: #if CAREFUL_ALIGNMENT
! 1219: u.x = IVAL(u.b,0);
! 1220: #endif
! 1221: #if SIZEOF_INT32 > 4
! 1222: if (u.x & (int32)0x80000000)
! 1223: u.x |= ~(int32)0xffffffff;
! 1224: #endif
! 1225: return u.x;
! 1226: }
! 1227:
! 1228: int64 read_varlong(int f, uchar min_bytes)
! 1229: {
! 1230: union {
! 1231: char b[9];
! 1232: int64 x;
! 1233: } u;
! 1234: char b2[8];
! 1235: int extra;
! 1236:
! 1237: #if SIZEOF_INT64 < 8
! 1238: memset(u.b, 0, 8);
! 1239: #else
! 1240: u.x = 0;
! 1241: #endif
! 1242: readfd(f, b2, min_bytes);
! 1243: memcpy(u.b, b2+1, min_bytes-1);
! 1244: extra = int_byte_extra[CVAL(b2, 0) / 4];
! 1245: if (extra) {
! 1246: uchar bit = ((uchar)1<<(8-extra));
! 1247: if (min_bytes + extra > (int)sizeof u.b) {
! 1248: rprintf(FERROR, "Overflow in read_varlong()\n");
! 1249: exit_cleanup(RERR_STREAMIO);
! 1250: }
! 1251: readfd(f, u.b + min_bytes - 1, extra);
! 1252: u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1);
! 1253: #if SIZEOF_INT64 < 8
! 1254: if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) {
! 1255: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
! 1256: exit_cleanup(RERR_UNSUPPORTED);
! 1257: }
! 1258: #endif
! 1259: } else
! 1260: u.b[min_bytes + extra - 1] = CVAL(b2, 0);
! 1261: #if SIZEOF_INT64 < 8
! 1262: u.x = IVAL(u.b,0);
! 1263: #elif CAREFUL_ALIGNMENT
! 1264: u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32);
! 1265: #endif
! 1266: return u.x;
! 1267: }
! 1268:
! 1269: int64 read_longint(int f)
! 1270: {
! 1271: #if SIZEOF_INT64 >= 8
! 1272: char b[9];
! 1273: #endif
! 1274: int32 num = read_int(f);
! 1275:
! 1276: if (num != (int32)0xffffffff)
! 1277: return num;
! 1278:
! 1279: #if SIZEOF_INT64 < 8
! 1280: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
! 1281: exit_cleanup(RERR_UNSUPPORTED);
! 1282: #else
! 1283: readfd(f, b, 8);
! 1284: return IVAL(b,0) | (((int64)IVAL(b,4))<<32);
! 1285: #endif
! 1286: }
! 1287:
! 1288: void read_buf(int f, char *buf, size_t len)
! 1289: {
! 1290: readfd(f,buf,len);
! 1291: }
! 1292:
! 1293: void read_sbuf(int f, char *buf, size_t len)
! 1294: {
! 1295: readfd(f, buf, len);
! 1296: buf[len] = '\0';
! 1297: }
! 1298:
! 1299: uchar read_byte(int f)
! 1300: {
! 1301: uchar c;
! 1302: readfd(f, (char *)&c, 1);
! 1303: return c;
! 1304: }
! 1305:
! 1306: int read_vstring(int f, char *buf, int bufsize)
! 1307: {
! 1308: int len = read_byte(f);
! 1309:
! 1310: if (len & 0x80)
! 1311: len = (len & ~0x80) * 0x100 + read_byte(f);
! 1312:
! 1313: if (len >= bufsize) {
! 1314: rprintf(FERROR, "over-long vstring received (%d > %d)\n",
! 1315: len, bufsize - 1);
! 1316: return -1;
! 1317: }
! 1318:
! 1319: if (len)
! 1320: readfd(f, buf, len);
! 1321: buf[len] = '\0';
! 1322: return len;
! 1323: }
! 1324:
! 1325: /* Populate a sum_struct with values from the socket. This is
! 1326: * called by both the sender and the receiver. */
! 1327: void read_sum_head(int f, struct sum_struct *sum)
! 1328: {
! 1329: int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE;
! 1330: sum->count = read_int(f);
! 1331: if (sum->count < 0) {
! 1332: rprintf(FERROR, "Invalid checksum count %ld [%s]\n",
! 1333: (long)sum->count, who_am_i());
! 1334: exit_cleanup(RERR_PROTOCOL);
! 1335: }
! 1336: sum->blength = read_int(f);
! 1337: if (sum->blength < 0 || sum->blength > max_blength) {
! 1338: rprintf(FERROR, "Invalid block length %ld [%s]\n",
! 1339: (long)sum->blength, who_am_i());
! 1340: exit_cleanup(RERR_PROTOCOL);
! 1341: }
! 1342: sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f);
! 1343: if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) {
! 1344: rprintf(FERROR, "Invalid checksum length %d [%s]\n",
! 1345: sum->s2length, who_am_i());
! 1346: exit_cleanup(RERR_PROTOCOL);
! 1347: }
! 1348: sum->remainder = read_int(f);
! 1349: if (sum->remainder < 0 || sum->remainder > sum->blength) {
! 1350: rprintf(FERROR, "Invalid remainder length %ld [%s]\n",
! 1351: (long)sum->remainder, who_am_i());
! 1352: exit_cleanup(RERR_PROTOCOL);
! 1353: }
! 1354: }
! 1355:
! 1356: /* Send the values from a sum_struct over the socket. Set sum to
! 1357: * NULL if there are no checksums to send. This is called by both
! 1358: * the generator and the sender. */
! 1359: void write_sum_head(int f, struct sum_struct *sum)
! 1360: {
! 1361: static struct sum_struct null_sum;
! 1362:
! 1363: if (sum == NULL)
! 1364: sum = &null_sum;
! 1365:
! 1366: write_int(f, sum->count);
! 1367: write_int(f, sum->blength);
! 1368: if (protocol_version >= 27)
! 1369: write_int(f, sum->s2length);
! 1370: write_int(f, sum->remainder);
! 1371: }
! 1372:
! 1373: /**
! 1374: * Sleep after writing to limit I/O bandwidth usage.
! 1375: *
! 1376: * @todo Rather than sleeping after each write, it might be better to
! 1377: * use some kind of averaging. The current algorithm seems to always
! 1378: * use a bit less bandwidth than specified, because it doesn't make up
! 1379: * for slow periods. But arguably this is a feature. In addition, we
! 1380: * ought to take the time used to write the data into account.
! 1381: *
! 1382: * During some phases of big transfers (file FOO is uptodate) this is
! 1383: * called with a small bytes_written every time. As the kernel has to
! 1384: * round small waits up to guarantee that we actually wait at least the
! 1385: * requested number of microseconds, this can become grossly inaccurate.
! 1386: * We therefore keep track of the bytes we've written over time and only
! 1387: * sleep when the accumulated delay is at least 1 tenth of a second.
! 1388: **/
! 1389: static void sleep_for_bwlimit(int bytes_written)
! 1390: {
! 1391: static struct timeval prior_tv;
! 1392: static long total_written = 0;
! 1393: struct timeval tv, start_tv;
! 1394: long elapsed_usec, sleep_usec;
! 1395:
! 1396: #define ONE_SEC 1000000L /* # of microseconds in a second */
! 1397:
! 1398: if (!bwlimit_writemax)
! 1399: return;
! 1400:
! 1401: total_written += bytes_written;
! 1402:
! 1403: gettimeofday(&start_tv, NULL);
! 1404: if (prior_tv.tv_sec) {
! 1405: elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC
! 1406: + (start_tv.tv_usec - prior_tv.tv_usec);
! 1407: total_written -= (int64)elapsed_usec * bwlimit / (ONE_SEC/1024);
! 1408: if (total_written < 0)
! 1409: total_written = 0;
! 1410: }
! 1411:
! 1412: sleep_usec = total_written * (ONE_SEC/1024) / bwlimit;
! 1413: if (sleep_usec < ONE_SEC / 10) {
! 1414: prior_tv = start_tv;
! 1415: return;
! 1416: }
! 1417:
! 1418: tv.tv_sec = sleep_usec / ONE_SEC;
! 1419: tv.tv_usec = sleep_usec % ONE_SEC;
! 1420: select(0, NULL, NULL, NULL, &tv);
! 1421:
! 1422: gettimeofday(&prior_tv, NULL);
! 1423: elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC
! 1424: + (prior_tv.tv_usec - start_tv.tv_usec);
! 1425: total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024);
! 1426: }
! 1427:
! 1428: static const char *what_fd_is(int fd)
! 1429: {
! 1430: static char buf[20];
! 1431:
! 1432: if (fd == sock_f_out)
! 1433: return "socket";
! 1434: else if (fd == msg_fd_out)
! 1435: return "message fd";
! 1436: else if (fd == batch_fd)
! 1437: return "batch file";
! 1438: else {
! 1439: snprintf(buf, sizeof buf, "fd %d", fd);
! 1440: return buf;
! 1441: }
! 1442: }
! 1443:
! 1444: /* Write len bytes to the file descriptor fd, looping as necessary to get
! 1445: * the job done and also (in certain circumstances) reading any data on
! 1446: * msg_fd_in to avoid deadlock.
! 1447: *
! 1448: * This function underlies the multiplexing system. The body of the
! 1449: * application never calls this function directly. */
! 1450: static void writefd_unbuffered(int fd, const char *buf, size_t len)
! 1451: {
! 1452: size_t n, total = 0;
! 1453: fd_set w_fds, r_fds, e_fds;
! 1454: int maxfd, count, cnt, using_r_fds;
! 1455: int defer_inc = 0;
! 1456: struct timeval tv;
! 1457:
! 1458: if (no_flush++)
! 1459: defer_forwarding_messages++, defer_inc++;
! 1460:
! 1461: while (total < len) {
! 1462: FD_ZERO(&w_fds);
! 1463: FD_SET(fd, &w_fds);
! 1464: FD_ZERO(&e_fds);
! 1465: FD_SET(fd, &e_fds);
! 1466: maxfd = fd;
! 1467:
! 1468: if (msg_fd_in >= 0) {
! 1469: FD_ZERO(&r_fds);
! 1470: FD_SET(msg_fd_in, &r_fds);
! 1471: if (msg_fd_in > maxfd)
! 1472: maxfd = msg_fd_in;
! 1473: using_r_fds = 1;
! 1474: } else
! 1475: using_r_fds = 0;
! 1476:
! 1477: tv.tv_sec = select_timeout;
! 1478: tv.tv_usec = 0;
! 1479:
! 1480: errno = 0;
! 1481: count = select(maxfd + 1, using_r_fds ? &r_fds : NULL,
! 1482: &w_fds, &e_fds, &tv);
! 1483:
! 1484: if (count <= 0) {
! 1485: if (count < 0 && errno == EBADF)
! 1486: exit_cleanup(RERR_SOCKETIO);
! 1487: check_timeout();
! 1488: continue;
! 1489: }
! 1490:
! 1491: /*if (FD_ISSET(fd, &e_fds))
! 1492: rprintf(FINFO, "select exception on fd %d\n", fd); */
! 1493:
! 1494: if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds))
! 1495: read_msg_fd();
! 1496:
! 1497: if (!FD_ISSET(fd, &w_fds))
! 1498: continue;
! 1499:
! 1500: n = len - total;
! 1501: if (bwlimit_writemax && n > bwlimit_writemax)
! 1502: n = bwlimit_writemax;
! 1503: cnt = write(fd, buf + total, n);
! 1504:
! 1505: if (cnt <= 0) {
! 1506: if (cnt < 0) {
! 1507: if (errno == EINTR)
! 1508: continue;
! 1509: if (errno == EWOULDBLOCK || errno == EAGAIN) {
! 1510: msleep(1);
! 1511: continue;
! 1512: }
! 1513: }
! 1514:
! 1515: /* Don't try to write errors back across the stream. */
! 1516: if (fd == sock_f_out)
! 1517: io_end_multiplex_out();
! 1518: /* Don't try to write errors down a failing msg pipe. */
! 1519: if (am_server && fd == msg_fd_out)
! 1520: exit_cleanup(RERR_STREAMIO);
! 1521: rsyserr(FERROR, errno,
! 1522: "writefd_unbuffered failed to write %ld bytes to %s [%s]",
! 1523: (long)len, what_fd_is(fd), who_am_i());
! 1524: /* If the other side is sending us error messages, try
! 1525: * to grab any messages they sent before they died. */
! 1526: while (!am_server && fd == sock_f_out && io_multiplexing_in) {
! 1527: char buf[1024];
! 1528: set_io_timeout(30);
! 1529: ignore_timeout = 0;
! 1530: readfd_unbuffered(sock_f_in, buf, sizeof buf);
! 1531: }
! 1532: exit_cleanup(RERR_STREAMIO);
! 1533: }
! 1534:
! 1535: total += cnt;
! 1536: defer_forwarding_messages++, defer_inc++;
! 1537:
! 1538: if (fd == sock_f_out) {
! 1539: if (io_timeout || am_generator)
! 1540: last_io_out = time(NULL);
! 1541: sleep_for_bwlimit(cnt);
! 1542: }
! 1543: }
! 1544:
! 1545: no_flush--;
! 1546: if (keep_defer_forwarding)
! 1547: defer_inc--;
! 1548: if (!(defer_forwarding_messages -= defer_inc) && !no_flush)
! 1549: msg_flush();
! 1550: }
! 1551:
! 1552: int io_flush(int flush_it_all)
! 1553: {
! 1554: int flushed_something = 0;
! 1555:
! 1556: if (no_flush)
! 1557: return 0;
! 1558:
! 1559: if (iobuf_out_cnt) {
! 1560: if (io_multiplexing_out)
! 1561: mplex_write(sock_f_out, MSG_DATA, iobuf_out, iobuf_out_cnt, 0);
! 1562: else
! 1563: writefd_unbuffered(iobuf_f_out, iobuf_out, iobuf_out_cnt);
! 1564: iobuf_out_cnt = 0;
! 1565: flushed_something = 1;
! 1566: }
! 1567:
! 1568: if (flush_it_all && !defer_forwarding_messages && msg_queue.head) {
! 1569: msg_flush();
! 1570: flushed_something = 1;
! 1571: }
! 1572:
! 1573: return flushed_something;
! 1574: }
! 1575:
! 1576: static void writefd(int fd, const char *buf, size_t len)
! 1577: {
! 1578: if (fd == sock_f_out)
! 1579: stats.total_written += len;
! 1580:
! 1581: if (fd == write_batch_monitor_out)
! 1582: writefd_unbuffered(batch_fd, buf, len);
! 1583:
! 1584: if (!iobuf_out || fd != iobuf_f_out) {
! 1585: writefd_unbuffered(fd, buf, len);
! 1586: return;
! 1587: }
! 1588:
! 1589: while (len) {
! 1590: int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt);
! 1591: if (n > 0) {
! 1592: memcpy(iobuf_out+iobuf_out_cnt, buf, n);
! 1593: buf += n;
! 1594: len -= n;
! 1595: iobuf_out_cnt += n;
! 1596: }
! 1597:
! 1598: if (iobuf_out_cnt == IO_BUFFER_SIZE)
! 1599: io_flush(NORMAL_FLUSH);
! 1600: }
! 1601: }
! 1602:
! 1603: void write_shortint(int f, unsigned short x)
! 1604: {
! 1605: char b[2];
! 1606: b[0] = (char)x;
! 1607: b[1] = (char)(x >> 8);
! 1608: writefd(f, b, 2);
! 1609: }
! 1610:
! 1611: void write_int(int f, int32 x)
! 1612: {
! 1613: char b[4];
! 1614: SIVAL(b, 0, x);
! 1615: writefd(f, b, 4);
! 1616: }
! 1617:
! 1618: void write_varint(int f, int32 x)
! 1619: {
! 1620: char b[5];
! 1621: uchar bit;
! 1622: int cnt = 4;
! 1623:
! 1624: SIVAL(b, 1, x);
! 1625:
! 1626: while (cnt > 1 && b[cnt] == 0)
! 1627: cnt--;
! 1628: bit = ((uchar)1<<(7-cnt+1));
! 1629: if (CVAL(b, cnt) >= bit) {
! 1630: cnt++;
! 1631: *b = ~(bit-1);
! 1632: } else if (cnt > 1)
! 1633: *b = b[cnt] | ~(bit*2-1);
! 1634: else
! 1635: *b = b[cnt];
! 1636:
! 1637: writefd(f, b, cnt);
! 1638: }
! 1639:
! 1640: void write_varlong(int f, int64 x, uchar min_bytes)
! 1641: {
! 1642: char b[9];
! 1643: uchar bit;
! 1644: int cnt = 8;
! 1645:
! 1646: SIVAL(b, 1, x);
! 1647: #if SIZEOF_INT64 >= 8
! 1648: SIVAL(b, 5, x >> 32);
! 1649: #else
! 1650: if (x <= 0x7FFFFFFF && x >= 0)
! 1651: memset(b + 5, 0, 4);
! 1652: else {
! 1653: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
! 1654: exit_cleanup(RERR_UNSUPPORTED);
! 1655: }
! 1656: #endif
! 1657:
! 1658: while (cnt > min_bytes && b[cnt] == 0)
! 1659: cnt--;
! 1660: bit = ((uchar)1<<(7-cnt+min_bytes));
! 1661: if (CVAL(b, cnt) >= bit) {
! 1662: cnt++;
! 1663: *b = ~(bit-1);
! 1664: } else if (cnt > min_bytes)
! 1665: *b = b[cnt] | ~(bit*2-1);
! 1666: else
! 1667: *b = b[cnt];
! 1668:
! 1669: writefd(f, b, cnt);
! 1670: }
! 1671:
! 1672: /*
! 1673: * Note: int64 may actually be a 32-bit type if ./configure couldn't find any
! 1674: * 64-bit types on this platform.
! 1675: */
! 1676: void write_longint(int f, int64 x)
! 1677: {
! 1678: char b[12], * const s = b+4;
! 1679:
! 1680: SIVAL(s, 0, x);
! 1681: if (x <= 0x7FFFFFFF && x >= 0) {
! 1682: writefd(f, s, 4);
! 1683: return;
! 1684: }
! 1685:
! 1686: #if SIZEOF_INT64 < 8
! 1687: rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n");
! 1688: exit_cleanup(RERR_UNSUPPORTED);
! 1689: #else
! 1690: memset(b, 0xFF, 4);
! 1691: SIVAL(s, 4, x >> 32);
! 1692: writefd(f, b, 12);
! 1693: #endif
! 1694: }
! 1695:
! 1696: void write_buf(int f, const char *buf, size_t len)
! 1697: {
! 1698: writefd(f,buf,len);
! 1699: }
! 1700:
! 1701: /** Write a string to the connection */
! 1702: void write_sbuf(int f, const char *buf)
! 1703: {
! 1704: writefd(f, buf, strlen(buf));
! 1705: }
! 1706:
! 1707: void write_byte(int f, uchar c)
! 1708: {
! 1709: writefd(f, (char *)&c, 1);
! 1710: }
! 1711:
! 1712: void write_vstring(int f, const char *str, int len)
! 1713: {
! 1714: uchar lenbuf[3], *lb = lenbuf;
! 1715:
! 1716: if (len > 0x7F) {
! 1717: if (len > 0x7FFF) {
! 1718: rprintf(FERROR,
! 1719: "attempting to send over-long vstring (%d > %d)\n",
! 1720: len, 0x7FFF);
! 1721: exit_cleanup(RERR_PROTOCOL);
! 1722: }
! 1723: *lb++ = len / 0x100 + 0x80;
! 1724: }
! 1725: *lb = len;
! 1726:
! 1727: writefd(f, (char*)lenbuf, lb - lenbuf + 1);
! 1728: if (len)
! 1729: writefd(f, str, len);
! 1730: }
! 1731:
! 1732: /* Send a file-list index using a byte-reduction method. */
! 1733: void write_ndx(int f, int32 ndx)
! 1734: {
! 1735: static int32 prev_positive = -1, prev_negative = 1;
! 1736: int32 diff, cnt = 0;
! 1737: char b[6];
! 1738:
! 1739: if (protocol_version < 30 || read_batch) {
! 1740: write_int(f, ndx);
! 1741: return;
! 1742: }
! 1743:
! 1744: /* Send NDX_DONE as a single-byte 0 with no side effects. Send
! 1745: * negative nums as a positive after sending a leading 0xFF. */
! 1746: if (ndx >= 0) {
! 1747: diff = ndx - prev_positive;
! 1748: prev_positive = ndx;
! 1749: } else if (ndx == NDX_DONE) {
! 1750: *b = 0;
! 1751: writefd(f, b, 1);
! 1752: return;
! 1753: } else {
! 1754: b[cnt++] = (char)0xFF;
! 1755: ndx = -ndx;
! 1756: diff = ndx - prev_negative;
! 1757: prev_negative = ndx;
! 1758: }
! 1759:
! 1760: /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767
! 1761: * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE
! 1762: * & all 4 bytes of the (non-negative) num with the high-bit set. */
! 1763: if (diff < 0xFE && diff > 0)
! 1764: b[cnt++] = (char)diff;
! 1765: else if (diff < 0 || diff > 0x7FFF) {
! 1766: b[cnt++] = (char)0xFE;
! 1767: b[cnt++] = (char)((ndx >> 24) | 0x80);
! 1768: b[cnt++] = (char)ndx;
! 1769: b[cnt++] = (char)(ndx >> 8);
! 1770: b[cnt++] = (char)(ndx >> 16);
! 1771: } else {
! 1772: b[cnt++] = (char)0xFE;
! 1773: b[cnt++] = (char)(diff >> 8);
! 1774: b[cnt++] = (char)diff;
! 1775: }
! 1776: writefd(f, b, cnt);
! 1777: }
! 1778:
! 1779: /* Receive a file-list index using a byte-reduction method. */
! 1780: int32 read_ndx(int f)
! 1781: {
! 1782: static int32 prev_positive = -1, prev_negative = 1;
! 1783: int32 *prev_ptr, num;
! 1784: char b[4];
! 1785:
! 1786: if (protocol_version < 30)
! 1787: return read_int(f);
! 1788:
! 1789: readfd(f, b, 1);
! 1790: if (CVAL(b, 0) == 0xFF) {
! 1791: readfd(f, b, 1);
! 1792: prev_ptr = &prev_negative;
! 1793: } else if (CVAL(b, 0) == 0)
! 1794: return NDX_DONE;
! 1795: else
! 1796: prev_ptr = &prev_positive;
! 1797: if (CVAL(b, 0) == 0xFE) {
! 1798: readfd(f, b, 2);
! 1799: if (CVAL(b, 0) & 0x80) {
! 1800: b[3] = CVAL(b, 0) & ~0x80;
! 1801: b[0] = b[1];
! 1802: readfd(f, b+1, 2);
! 1803: num = IVAL(b, 0);
! 1804: } else
! 1805: num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr;
! 1806: } else
! 1807: num = UVAL(b, 0) + *prev_ptr;
! 1808: *prev_ptr = num;
! 1809: if (prev_ptr == &prev_negative)
! 1810: num = -num;
! 1811: return num;
! 1812: }
! 1813:
! 1814: /* Read a line of up to bufsiz-1 characters into buf. Strips
! 1815: * the (required) trailing newline and all carriage returns.
! 1816: * Returns 1 for success; 0 for I/O error or truncation. */
! 1817: int read_line_old(int f, char *buf, size_t bufsiz)
! 1818: {
! 1819: bufsiz--; /* leave room for the null */
! 1820: while (bufsiz > 0) {
! 1821: buf[0] = 0;
! 1822: read_buf(f, buf, 1);
! 1823: if (buf[0] == 0)
! 1824: return 0;
! 1825: if (buf[0] == '\n')
! 1826: break;
! 1827: if (buf[0] != '\r') {
! 1828: buf++;
! 1829: bufsiz--;
! 1830: }
! 1831: }
! 1832: *buf = '\0';
! 1833: return bufsiz > 0;
! 1834: }
! 1835:
! 1836: void io_printf(int fd, const char *format, ...)
! 1837: {
! 1838: va_list ap;
! 1839: char buf[BIGPATHBUFLEN];
! 1840: int len;
! 1841:
! 1842: va_start(ap, format);
! 1843: len = vsnprintf(buf, sizeof buf, format, ap);
! 1844: va_end(ap);
! 1845:
! 1846: if (len < 0)
! 1847: exit_cleanup(RERR_STREAMIO);
! 1848:
! 1849: if (len > (int)sizeof buf) {
! 1850: rprintf(FERROR, "io_printf() was too long for the buffer.\n");
! 1851: exit_cleanup(RERR_STREAMIO);
! 1852: }
! 1853:
! 1854: write_sbuf(fd, buf);
! 1855: }
! 1856:
! 1857: /** Setup for multiplexing a MSG_* stream with the data stream. */
! 1858: void io_start_multiplex_out(void)
! 1859: {
! 1860: io_flush(NORMAL_FLUSH);
! 1861: io_start_buffering_out(sock_f_out);
! 1862: io_multiplexing_out = 1;
! 1863: }
! 1864:
! 1865: /** Setup for multiplexing a MSG_* stream with the data stream. */
! 1866: void io_start_multiplex_in(void)
! 1867: {
! 1868: io_flush(NORMAL_FLUSH);
! 1869: io_start_buffering_in(sock_f_in);
! 1870: io_multiplexing_in = 1;
! 1871: }
! 1872:
! 1873: /** Write an message to the multiplexed data stream. */
! 1874: int io_multiplex_write(enum msgcode code, const char *buf, size_t len, int convert)
! 1875: {
! 1876: if (!io_multiplexing_out)
! 1877: return 0;
! 1878: io_flush(NORMAL_FLUSH);
! 1879: stats.total_written += (len+4);
! 1880: mplex_write(sock_f_out, code, buf, len, convert);
! 1881: return 1;
! 1882: }
! 1883:
! 1884: void io_end_multiplex_in(void)
! 1885: {
! 1886: io_multiplexing_in = 0;
! 1887: io_end_buffering_in();
! 1888: }
! 1889:
! 1890: /** Stop output multiplexing. */
! 1891: void io_end_multiplex_out(void)
! 1892: {
! 1893: io_multiplexing_out = 0;
! 1894: io_end_buffering_out();
! 1895: }
! 1896:
! 1897: void start_write_batch(int fd)
! 1898: {
! 1899: /* Some communication has already taken place, but we don't
! 1900: * enable batch writing until here so that we can write a
! 1901: * canonical record of the communication even though the
! 1902: * actual communication so far depends on whether a daemon
! 1903: * is involved. */
! 1904: write_int(batch_fd, protocol_version);
! 1905: if (protocol_version >= 30)
! 1906: write_byte(batch_fd, compat_flags);
! 1907: write_int(batch_fd, checksum_seed);
! 1908:
! 1909: if (am_sender)
! 1910: write_batch_monitor_out = fd;
! 1911: else
! 1912: write_batch_monitor_in = fd;
! 1913: }
! 1914:
! 1915: void stop_write_batch(void)
! 1916: {
! 1917: write_batch_monitor_out = -1;
! 1918: write_batch_monitor_in = -1;
! 1919: }
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