| 1 | /* -*- c-file-style: "linux" -*- |
| 2 | * |
| 3 | * Copyright (C) 1996-2001 by Andrew Tridgell |
| 4 | * Copyright (C) Paul Mackerras 1996 |
| 5 | * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file io.c |
| 24 | * |
| 25 | * Socket and pipe I/O utilities used in rsync. |
| 26 | * |
| 27 | * rsync provides its own multiplexing system, which is used to send |
| 28 | * stderr and stdout over a single socket. We need this because |
| 29 | * stdout normally carries the binary data stream, and stderr all our |
| 30 | * error messages. |
| 31 | * |
| 32 | * For historical reasons this is off during the start of the |
| 33 | * connection, but it's switched on quite early using |
| 34 | * io_start_multiplex_out() and io_start_multiplex_in(). |
| 35 | **/ |
| 36 | |
| 37 | #include "rsync.h" |
| 38 | |
| 39 | /** If no timeout is specified then use a 60 second select timeout */ |
| 40 | #define SELECT_TIMEOUT 60 |
| 41 | |
| 42 | extern int bwlimit; |
| 43 | extern size_t bwlimit_writemax; |
| 44 | extern int verbose; |
| 45 | extern int io_timeout; |
| 46 | extern int allowed_lull; |
| 47 | extern int am_server; |
| 48 | extern int am_daemon; |
| 49 | extern int am_sender; |
| 50 | extern int am_generator; |
| 51 | extern int eol_nulls; |
| 52 | extern int read_batch; |
| 53 | extern int csum_length; |
| 54 | extern int checksum_seed; |
| 55 | extern int protocol_version; |
| 56 | extern int remove_sent_files; |
| 57 | extern int preserve_hard_links; |
| 58 | extern char *filesfrom_host; |
| 59 | extern struct stats stats; |
| 60 | extern struct file_list *the_file_list; |
| 61 | |
| 62 | const char phase_unknown[] = "unknown"; |
| 63 | int ignore_timeout = 0; |
| 64 | int batch_fd = -1; |
| 65 | int batch_gen_fd = -1; |
| 66 | |
| 67 | /** |
| 68 | * The connection might be dropped at some point; perhaps because the |
| 69 | * remote instance crashed. Just giving the offset on the stream is |
| 70 | * not very helpful. So instead we try to make io_phase_name point to |
| 71 | * something useful. |
| 72 | * |
| 73 | * For buffered/multiplexed I/O these names will be somewhat |
| 74 | * approximate; perhaps for ease of support we would rather make the |
| 75 | * buffer always flush when a single application-level I/O finishes. |
| 76 | * |
| 77 | * @todo Perhaps we want some simple stack functionality, but there's |
| 78 | * no need to overdo it. |
| 79 | **/ |
| 80 | const char *io_write_phase = phase_unknown; |
| 81 | const char *io_read_phase = phase_unknown; |
| 82 | |
| 83 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
| 84 | int kluge_around_eof = 0; |
| 85 | |
| 86 | int msg_fd_in = -1; |
| 87 | int msg_fd_out = -1; |
| 88 | int sock_f_in = -1; |
| 89 | int sock_f_out = -1; |
| 90 | |
| 91 | static int io_multiplexing_out; |
| 92 | static int io_multiplexing_in; |
| 93 | static time_t last_io_in; |
| 94 | static time_t last_io_out; |
| 95 | static int no_flush; |
| 96 | |
| 97 | static int write_batch_monitor_in = -1; |
| 98 | static int write_batch_monitor_out = -1; |
| 99 | |
| 100 | static int io_filesfrom_f_in = -1; |
| 101 | static int io_filesfrom_f_out = -1; |
| 102 | static char io_filesfrom_buf[2048]; |
| 103 | static char *io_filesfrom_bp; |
| 104 | static char io_filesfrom_lastchar; |
| 105 | static int io_filesfrom_buflen; |
| 106 | static size_t contiguous_write_len = 0; |
| 107 | static int select_timeout = SELECT_TIMEOUT; |
| 108 | |
| 109 | static void read_loop(int fd, char *buf, size_t len); |
| 110 | |
| 111 | struct flist_ndx_item { |
| 112 | struct flist_ndx_item *next; |
| 113 | int ndx; |
| 114 | }; |
| 115 | |
| 116 | struct flist_ndx_list { |
| 117 | struct flist_ndx_item *head, *tail; |
| 118 | }; |
| 119 | |
| 120 | static struct flist_ndx_list redo_list, hlink_list; |
| 121 | |
| 122 | struct msg_list_item { |
| 123 | struct msg_list_item *next; |
| 124 | char *buf; |
| 125 | int len; |
| 126 | }; |
| 127 | |
| 128 | struct msg_list { |
| 129 | struct msg_list_item *head, *tail; |
| 130 | }; |
| 131 | |
| 132 | static struct msg_list msg_list; |
| 133 | |
| 134 | static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) |
| 135 | { |
| 136 | struct flist_ndx_item *item; |
| 137 | |
| 138 | if (!(item = new(struct flist_ndx_item))) |
| 139 | out_of_memory("flist_ndx_push"); |
| 140 | item->next = NULL; |
| 141 | item->ndx = ndx; |
| 142 | if (lp->tail) |
| 143 | lp->tail->next = item; |
| 144 | else |
| 145 | lp->head = item; |
| 146 | lp->tail = item; |
| 147 | } |
| 148 | |
| 149 | static int flist_ndx_pop(struct flist_ndx_list *lp) |
| 150 | { |
| 151 | struct flist_ndx_item *next; |
| 152 | int ndx; |
| 153 | |
| 154 | if (!lp->head) |
| 155 | return -1; |
| 156 | |
| 157 | ndx = lp->head->ndx; |
| 158 | next = lp->head->next; |
| 159 | free(lp->head); |
| 160 | lp->head = next; |
| 161 | if (!next) |
| 162 | lp->tail = NULL; |
| 163 | |
| 164 | return ndx; |
| 165 | } |
| 166 | |
| 167 | static void check_timeout(void) |
| 168 | { |
| 169 | time_t t; |
| 170 | |
| 171 | if (!io_timeout || ignore_timeout) |
| 172 | return; |
| 173 | |
| 174 | if (!last_io_in) { |
| 175 | last_io_in = time(NULL); |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | t = time(NULL); |
| 180 | |
| 181 | if (t - last_io_in >= io_timeout) { |
| 182 | if (!am_server && !am_daemon) { |
| 183 | rprintf(FERROR, "io timeout after %d seconds -- exiting\n", |
| 184 | (int)(t-last_io_in)); |
| 185 | } |
| 186 | exit_cleanup(RERR_TIMEOUT); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /* Note the fds used for the main socket (which might really be a pipe |
| 191 | * for a local transfer, but we can ignore that). */ |
| 192 | void io_set_sock_fds(int f_in, int f_out) |
| 193 | { |
| 194 | sock_f_in = f_in; |
| 195 | sock_f_out = f_out; |
| 196 | } |
| 197 | |
| 198 | void set_io_timeout(int secs) |
| 199 | { |
| 200 | io_timeout = secs; |
| 201 | |
| 202 | if (!io_timeout || io_timeout > SELECT_TIMEOUT) |
| 203 | select_timeout = SELECT_TIMEOUT; |
| 204 | else |
| 205 | select_timeout = io_timeout; |
| 206 | |
| 207 | allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; |
| 208 | } |
| 209 | |
| 210 | /* Setup the fd used to receive MSG_* messages. Only needed during the |
| 211 | * early stages of being a local sender (up through the sending of the |
| 212 | * file list) or when we're the generator (to fetch the messages from |
| 213 | * the receiver). */ |
| 214 | void set_msg_fd_in(int fd) |
| 215 | { |
| 216 | msg_fd_in = fd; |
| 217 | } |
| 218 | |
| 219 | /* Setup the fd used to send our MSG_* messages. Only needed when |
| 220 | * we're the receiver (to send our messages to the generator). */ |
| 221 | void set_msg_fd_out(int fd) |
| 222 | { |
| 223 | msg_fd_out = fd; |
| 224 | set_nonblocking(msg_fd_out); |
| 225 | } |
| 226 | |
| 227 | /* Add a message to the pending MSG_* list. */ |
| 228 | static void msg_list_add(int code, char *buf, int len) |
| 229 | { |
| 230 | struct msg_list_item *ml; |
| 231 | |
| 232 | if (!(ml = new(struct msg_list_item))) |
| 233 | out_of_memory("msg_list_add"); |
| 234 | ml->next = NULL; |
| 235 | if (!(ml->buf = new_array(char, len+4))) |
| 236 | out_of_memory("msg_list_add"); |
| 237 | SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); |
| 238 | memcpy(ml->buf+4, buf, len); |
| 239 | ml->len = len+4; |
| 240 | if (msg_list.tail) |
| 241 | msg_list.tail->next = ml; |
| 242 | else |
| 243 | msg_list.head = ml; |
| 244 | msg_list.tail = ml; |
| 245 | } |
| 246 | |
| 247 | /* Read a message from the MSG_* fd and handle it. This is called either |
| 248 | * during the early stages of being a local sender (up through the sending |
| 249 | * of the file list) or when we're the generator (to fetch the messages |
| 250 | * from the receiver). */ |
| 251 | static void read_msg_fd(void) |
| 252 | { |
| 253 | char buf[2048]; |
| 254 | size_t n; |
| 255 | int fd = msg_fd_in; |
| 256 | int tag, len; |
| 257 | |
| 258 | /* Temporarily disable msg_fd_in. This is needed to avoid looping back |
| 259 | * to this routine from writefd_unbuffered(). */ |
| 260 | msg_fd_in = -1; |
| 261 | |
| 262 | read_loop(fd, buf, 4); |
| 263 | tag = IVAL(buf, 0); |
| 264 | |
| 265 | len = tag & 0xFFFFFF; |
| 266 | tag = (tag >> 24) - MPLEX_BASE; |
| 267 | |
| 268 | switch (tag) { |
| 269 | case MSG_DONE: |
| 270 | if (len != 0 || !am_generator) { |
| 271 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
| 272 | exit_cleanup(RERR_STREAMIO); |
| 273 | } |
| 274 | flist_ndx_push(&redo_list, -1); |
| 275 | break; |
| 276 | case MSG_REDO: |
| 277 | if (len != 4 || !am_generator) { |
| 278 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
| 279 | exit_cleanup(RERR_STREAMIO); |
| 280 | } |
| 281 | read_loop(fd, buf, 4); |
| 282 | flist_ndx_push(&redo_list, IVAL(buf,0)); |
| 283 | break; |
| 284 | case MSG_DELETED: |
| 285 | if (len >= (int)sizeof buf || !am_generator) { |
| 286 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
| 287 | exit_cleanup(RERR_STREAMIO); |
| 288 | } |
| 289 | read_loop(fd, buf, len); |
| 290 | io_multiplex_write(MSG_DELETED, buf, len); |
| 291 | break; |
| 292 | case MSG_SUCCESS: |
| 293 | if (len != 4 || !am_generator) { |
| 294 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
| 295 | exit_cleanup(RERR_STREAMIO); |
| 296 | } |
| 297 | read_loop(fd, buf, len); |
| 298 | if (remove_sent_files) |
| 299 | io_multiplex_write(MSG_SUCCESS, buf, len); |
| 300 | if (preserve_hard_links) |
| 301 | flist_ndx_push(&hlink_list, IVAL(buf,0)); |
| 302 | break; |
| 303 | case MSG_SOCKERR: |
| 304 | if (!am_generator) { |
| 305 | rprintf(FERROR, "invalid message %d:%d\n", tag, len); |
| 306 | exit_cleanup(RERR_STREAMIO); |
| 307 | } |
| 308 | close_multiplexing_out(); |
| 309 | /* FALL THROUGH */ |
| 310 | case MSG_INFO: |
| 311 | case MSG_ERROR: |
| 312 | case MSG_LOG: |
| 313 | while (len) { |
| 314 | n = len; |
| 315 | if (n >= sizeof buf) |
| 316 | n = sizeof buf - 1; |
| 317 | read_loop(fd, buf, n); |
| 318 | rwrite((enum logcode)tag, buf, n); |
| 319 | len -= n; |
| 320 | } |
| 321 | break; |
| 322 | default: |
| 323 | rprintf(FERROR, "unknown message %d:%d\n", tag, len); |
| 324 | exit_cleanup(RERR_STREAMIO); |
| 325 | } |
| 326 | |
| 327 | msg_fd_in = fd; |
| 328 | } |
| 329 | |
| 330 | /* Try to push messages off the list onto the wire. If we leave with more |
| 331 | * to do, return 0. On error, return -1. If everything flushed, return 1. |
| 332 | * This is only active in the receiver. */ |
| 333 | static int msg_list_flush(int flush_it_all) |
| 334 | { |
| 335 | static int written = 0; |
| 336 | struct timeval tv; |
| 337 | fd_set fds; |
| 338 | |
| 339 | if (msg_fd_out < 0) |
| 340 | return -1; |
| 341 | |
| 342 | while (msg_list.head) { |
| 343 | struct msg_list_item *ml = msg_list.head; |
| 344 | int n = write(msg_fd_out, ml->buf + written, ml->len - written); |
| 345 | if (n < 0) { |
| 346 | if (errno == EINTR) |
| 347 | continue; |
| 348 | if (errno != EWOULDBLOCK && errno != EAGAIN) |
| 349 | return -1; |
| 350 | if (!flush_it_all) |
| 351 | return 0; |
| 352 | FD_ZERO(&fds); |
| 353 | FD_SET(msg_fd_out, &fds); |
| 354 | tv.tv_sec = select_timeout; |
| 355 | tv.tv_usec = 0; |
| 356 | if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) |
| 357 | check_timeout(); |
| 358 | } else if ((written += n) == ml->len) { |
| 359 | free(ml->buf); |
| 360 | msg_list.head = ml->next; |
| 361 | if (!msg_list.head) |
| 362 | msg_list.tail = NULL; |
| 363 | free(ml); |
| 364 | written = 0; |
| 365 | } |
| 366 | } |
| 367 | return 1; |
| 368 | } |
| 369 | |
| 370 | void send_msg(enum msgcode code, char *buf, int len) |
| 371 | { |
| 372 | if (msg_fd_out < 0) { |
| 373 | io_multiplex_write(code, buf, len); |
| 374 | return; |
| 375 | } |
| 376 | msg_list_add(code, buf, len); |
| 377 | msg_list_flush(NORMAL_FLUSH); |
| 378 | } |
| 379 | |
| 380 | int get_redo_num(int itemizing, enum logcode code) |
| 381 | { |
| 382 | while (1) { |
| 383 | if (hlink_list.head) |
| 384 | check_for_finished_hlinks(itemizing, code); |
| 385 | if (redo_list.head) |
| 386 | break; |
| 387 | read_msg_fd(); |
| 388 | } |
| 389 | |
| 390 | return flist_ndx_pop(&redo_list); |
| 391 | } |
| 392 | |
| 393 | int get_hlink_num(void) |
| 394 | { |
| 395 | return flist_ndx_pop(&hlink_list); |
| 396 | } |
| 397 | |
| 398 | /** |
| 399 | * When we're the receiver and we have a local --files-from list of names |
| 400 | * that needs to be sent over the socket to the sender, we have to do two |
| 401 | * things at the same time: send the sender a list of what files we're |
| 402 | * processing and read the incoming file+info list from the sender. We do |
| 403 | * this by augmenting the read_timeout() function to copy this data. It |
| 404 | * uses the io_filesfrom_buf to read a block of data from f_in (when it is |
| 405 | * ready, since it might be a pipe) and then blast it out f_out (when it |
| 406 | * is ready to receive more data). |
| 407 | */ |
| 408 | void io_set_filesfrom_fds(int f_in, int f_out) |
| 409 | { |
| 410 | io_filesfrom_f_in = f_in; |
| 411 | io_filesfrom_f_out = f_out; |
| 412 | io_filesfrom_bp = io_filesfrom_buf; |
| 413 | io_filesfrom_lastchar = '\0'; |
| 414 | io_filesfrom_buflen = 0; |
| 415 | } |
| 416 | |
| 417 | /* It's almost always an error to get an EOF when we're trying to read from the |
| 418 | * network, because the protocol is (for the most part) self-terminating. |
| 419 | * |
| 420 | * There is one case for the receiver when it is at the end of the transfer |
| 421 | * (hanging around reading any keep-alive packets that might come its way): if |
| 422 | * the sender dies before the generator's kill-signal comes through, we can end |
| 423 | * up here needing to loop until the kill-signal arrives. In this situation, |
| 424 | * kluge_around_eof will be < 0. |
| 425 | * |
| 426 | * There is another case for older protocol versions (< 24) where the module |
| 427 | * listing was not terminated, so we must ignore an EOF error in that case and |
| 428 | * exit. In this situation, kluge_around_eof will be > 0. */ |
| 429 | static void whine_about_eof(int fd) |
| 430 | { |
| 431 | if (kluge_around_eof && fd == sock_f_in) { |
| 432 | int i; |
| 433 | if (kluge_around_eof > 0) |
| 434 | exit_cleanup(0); |
| 435 | /* If we're still here after 10 seconds, exit with an error. */ |
| 436 | for (i = 10*1000/20; i--; ) |
| 437 | msleep(20); |
| 438 | } |
| 439 | |
| 440 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
| 441 | "(%.0f bytes received so far) [%s]\n", |
| 442 | (double)stats.total_read, who_am_i()); |
| 443 | |
| 444 | exit_cleanup(RERR_STREAMIO); |
| 445 | } |
| 446 | |
| 447 | /** |
| 448 | * Read from a socket with I/O timeout. return the number of bytes |
| 449 | * read. If no bytes can be read then exit, never return a number <= 0. |
| 450 | * |
| 451 | * TODO: If the remote shell connection fails, then current versions |
| 452 | * actually report an "unexpected EOF" error here. Since it's a |
| 453 | * fairly common mistake to try to use rsh when ssh is required, we |
| 454 | * should trap that: if we fail to read any data at all, we should |
| 455 | * give a better explanation. We can tell whether the connection has |
| 456 | * started by looking e.g. at whether the remote version is known yet. |
| 457 | */ |
| 458 | static int read_timeout(int fd, char *buf, size_t len) |
| 459 | { |
| 460 | int n, cnt = 0; |
| 461 | |
| 462 | io_flush(NORMAL_FLUSH); |
| 463 | |
| 464 | while (cnt == 0) { |
| 465 | /* until we manage to read *something* */ |
| 466 | fd_set r_fds, w_fds; |
| 467 | struct timeval tv; |
| 468 | int maxfd = fd; |
| 469 | int count; |
| 470 | |
| 471 | FD_ZERO(&r_fds); |
| 472 | FD_ZERO(&w_fds); |
| 473 | FD_SET(fd, &r_fds); |
| 474 | if (msg_list.head) { |
| 475 | FD_SET(msg_fd_out, &w_fds); |
| 476 | if (msg_fd_out > maxfd) |
| 477 | maxfd = msg_fd_out; |
| 478 | } |
| 479 | if (io_filesfrom_f_out >= 0) { |
| 480 | int new_fd; |
| 481 | if (io_filesfrom_buflen == 0) { |
| 482 | if (io_filesfrom_f_in >= 0) { |
| 483 | FD_SET(io_filesfrom_f_in, &r_fds); |
| 484 | new_fd = io_filesfrom_f_in; |
| 485 | } else { |
| 486 | io_filesfrom_f_out = -1; |
| 487 | new_fd = -1; |
| 488 | } |
| 489 | } else { |
| 490 | FD_SET(io_filesfrom_f_out, &w_fds); |
| 491 | new_fd = io_filesfrom_f_out; |
| 492 | } |
| 493 | if (new_fd > maxfd) |
| 494 | maxfd = new_fd; |
| 495 | } |
| 496 | |
| 497 | tv.tv_sec = select_timeout; |
| 498 | tv.tv_usec = 0; |
| 499 | |
| 500 | errno = 0; |
| 501 | |
| 502 | count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv); |
| 503 | |
| 504 | if (count <= 0) { |
| 505 | if (errno == EBADF) |
| 506 | exit_cleanup(RERR_SOCKETIO); |
| 507 | check_timeout(); |
| 508 | continue; |
| 509 | } |
| 510 | |
| 511 | if (msg_list.head && FD_ISSET(msg_fd_out, &w_fds)) |
| 512 | msg_list_flush(NORMAL_FLUSH); |
| 513 | |
| 514 | if (io_filesfrom_f_out >= 0) { |
| 515 | if (io_filesfrom_buflen) { |
| 516 | if (FD_ISSET(io_filesfrom_f_out, &w_fds)) { |
| 517 | int l = write(io_filesfrom_f_out, |
| 518 | io_filesfrom_bp, |
| 519 | io_filesfrom_buflen); |
| 520 | if (l > 0) { |
| 521 | if (!(io_filesfrom_buflen -= l)) |
| 522 | io_filesfrom_bp = io_filesfrom_buf; |
| 523 | else |
| 524 | io_filesfrom_bp += l; |
| 525 | } else { |
| 526 | /* XXX should we complain? */ |
| 527 | io_filesfrom_f_out = -1; |
| 528 | } |
| 529 | } |
| 530 | } else if (io_filesfrom_f_in >= 0) { |
| 531 | if (FD_ISSET(io_filesfrom_f_in, &r_fds)) { |
| 532 | int l = read(io_filesfrom_f_in, |
| 533 | io_filesfrom_buf, |
| 534 | sizeof io_filesfrom_buf); |
| 535 | if (l <= 0) { |
| 536 | /* Send end-of-file marker */ |
| 537 | io_filesfrom_buf[0] = '\0'; |
| 538 | io_filesfrom_buf[1] = '\0'; |
| 539 | io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1; |
| 540 | io_filesfrom_f_in = -1; |
| 541 | } else { |
| 542 | if (!eol_nulls) { |
| 543 | char *s = io_filesfrom_buf + l; |
| 544 | /* Transform CR and/or LF into '\0' */ |
| 545 | while (s-- > io_filesfrom_buf) { |
| 546 | if (*s == '\n' || *s == '\r') |
| 547 | *s = '\0'; |
| 548 | } |
| 549 | } |
| 550 | if (!io_filesfrom_lastchar) { |
| 551 | /* Last buf ended with a '\0', so don't |
| 552 | * let this buf start with one. */ |
| 553 | while (l && !*io_filesfrom_bp) |
| 554 | io_filesfrom_bp++, l--; |
| 555 | } |
| 556 | if (!l) |
| 557 | io_filesfrom_bp = io_filesfrom_buf; |
| 558 | else { |
| 559 | char *f = io_filesfrom_bp; |
| 560 | char *t = f; |
| 561 | char *eob = f + l; |
| 562 | /* Eliminate any multi-'\0' runs. */ |
| 563 | while (f != eob) { |
| 564 | if (!(*t++ = *f++)) { |
| 565 | while (f != eob && !*f) |
| 566 | f++, l--; |
| 567 | } |
| 568 | } |
| 569 | io_filesfrom_lastchar = f[-1]; |
| 570 | } |
| 571 | io_filesfrom_buflen = l; |
| 572 | } |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | if (!FD_ISSET(fd, &r_fds)) |
| 578 | continue; |
| 579 | |
| 580 | n = read(fd, buf, len); |
| 581 | |
| 582 | if (n <= 0) { |
| 583 | if (n == 0) |
| 584 | whine_about_eof(fd); /* Doesn't return. */ |
| 585 | if (errno == EINTR || errno == EWOULDBLOCK |
| 586 | || errno == EAGAIN) |
| 587 | continue; |
| 588 | |
| 589 | /* Don't write errors on a dead socket. */ |
| 590 | if (fd == sock_f_in) { |
| 591 | close_multiplexing_out(); |
| 592 | rsyserr(FSOCKERR, errno, "read error"); |
| 593 | } else |
| 594 | rsyserr(FERROR, errno, "read error"); |
| 595 | exit_cleanup(RERR_STREAMIO); |
| 596 | } |
| 597 | |
| 598 | buf += n; |
| 599 | len -= n; |
| 600 | cnt += n; |
| 601 | |
| 602 | if (fd == sock_f_in && io_timeout) |
| 603 | last_io_in = time(NULL); |
| 604 | } |
| 605 | |
| 606 | return cnt; |
| 607 | } |
| 608 | |
| 609 | /** |
| 610 | * Read a line into the "fname" buffer (which must be at least MAXPATHLEN |
| 611 | * characters long). |
| 612 | */ |
| 613 | int read_filesfrom_line(int fd, char *fname) |
| 614 | { |
| 615 | char ch, *s, *eob = fname + MAXPATHLEN - 1; |
| 616 | int cnt; |
| 617 | int reading_remotely = filesfrom_host != NULL; |
| 618 | int nulls = eol_nulls || reading_remotely; |
| 619 | |
| 620 | start: |
| 621 | s = fname; |
| 622 | while (1) { |
| 623 | cnt = read(fd, &ch, 1); |
| 624 | if (cnt < 0 && (errno == EWOULDBLOCK |
| 625 | || errno == EINTR || errno == EAGAIN)) { |
| 626 | struct timeval tv; |
| 627 | fd_set fds; |
| 628 | FD_ZERO(&fds); |
| 629 | FD_SET(fd, &fds); |
| 630 | tv.tv_sec = select_timeout; |
| 631 | tv.tv_usec = 0; |
| 632 | if (!select(fd+1, &fds, NULL, NULL, &tv)) |
| 633 | check_timeout(); |
| 634 | continue; |
| 635 | } |
| 636 | if (cnt != 1) |
| 637 | break; |
| 638 | if (nulls? !ch : (ch == '\r' || ch == '\n')) { |
| 639 | /* Skip empty lines if reading locally. */ |
| 640 | if (!reading_remotely && s == fname) |
| 641 | continue; |
| 642 | break; |
| 643 | } |
| 644 | if (s < eob) |
| 645 | *s++ = ch; |
| 646 | } |
| 647 | *s = '\0'; |
| 648 | |
| 649 | /* Dump comments. */ |
| 650 | if (*fname == '#' || *fname == ';') |
| 651 | goto start; |
| 652 | |
| 653 | return s - fname; |
| 654 | } |
| 655 | |
| 656 | static char *iobuf_out; |
| 657 | static int iobuf_out_cnt; |
| 658 | |
| 659 | void io_start_buffering_out(void) |
| 660 | { |
| 661 | if (iobuf_out) |
| 662 | return; |
| 663 | if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE))) |
| 664 | out_of_memory("io_start_buffering_out"); |
| 665 | iobuf_out_cnt = 0; |
| 666 | } |
| 667 | |
| 668 | static char *iobuf_in; |
| 669 | static size_t iobuf_in_siz; |
| 670 | |
| 671 | void io_start_buffering_in(void) |
| 672 | { |
| 673 | if (iobuf_in) |
| 674 | return; |
| 675 | iobuf_in_siz = 2 * IO_BUFFER_SIZE; |
| 676 | if (!(iobuf_in = new_array(char, iobuf_in_siz))) |
| 677 | out_of_memory("io_start_buffering_in"); |
| 678 | } |
| 679 | |
| 680 | void io_end_buffering(void) |
| 681 | { |
| 682 | io_flush(NORMAL_FLUSH); |
| 683 | if (!io_multiplexing_out) { |
| 684 | free(iobuf_out); |
| 685 | iobuf_out = NULL; |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | void maybe_flush_socket(void) |
| 690 | { |
| 691 | if (iobuf_out && iobuf_out_cnt && time(NULL) - last_io_out >= 5) |
| 692 | io_flush(NORMAL_FLUSH); |
| 693 | } |
| 694 | |
| 695 | void maybe_send_keepalive(void) |
| 696 | { |
| 697 | if (time(NULL) - last_io_out >= allowed_lull) { |
| 698 | if (!iobuf_out || !iobuf_out_cnt) { |
| 699 | if (protocol_version < 29) |
| 700 | return; /* there's nothing we can do */ |
| 701 | write_int(sock_f_out, the_file_list->count); |
| 702 | write_shortint(sock_f_out, ITEM_IS_NEW); |
| 703 | } |
| 704 | if (iobuf_out) |
| 705 | io_flush(NORMAL_FLUSH); |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | /** |
| 710 | * Continue trying to read len bytes - don't return until len has been |
| 711 | * read. |
| 712 | **/ |
| 713 | static void read_loop(int fd, char *buf, size_t len) |
| 714 | { |
| 715 | while (len) { |
| 716 | int n = read_timeout(fd, buf, len); |
| 717 | |
| 718 | buf += n; |
| 719 | len -= n; |
| 720 | } |
| 721 | } |
| 722 | |
| 723 | /** |
| 724 | * Read from the file descriptor handling multiplexing - return number |
| 725 | * of bytes read. |
| 726 | * |
| 727 | * Never returns <= 0. |
| 728 | */ |
| 729 | static int readfd_unbuffered(int fd, char *buf, size_t len) |
| 730 | { |
| 731 | static size_t remaining; |
| 732 | static size_t iobuf_in_ndx; |
| 733 | size_t msg_bytes; |
| 734 | int tag, cnt = 0; |
| 735 | char line[BIGPATHBUFLEN]; |
| 736 | |
| 737 | if (!iobuf_in || fd != sock_f_in) |
| 738 | return read_timeout(fd, buf, len); |
| 739 | |
| 740 | if (!io_multiplexing_in && remaining == 0) { |
| 741 | remaining = read_timeout(fd, iobuf_in, iobuf_in_siz); |
| 742 | iobuf_in_ndx = 0; |
| 743 | } |
| 744 | |
| 745 | while (cnt == 0) { |
| 746 | if (remaining) { |
| 747 | len = MIN(len, remaining); |
| 748 | memcpy(buf, iobuf_in + iobuf_in_ndx, len); |
| 749 | iobuf_in_ndx += len; |
| 750 | remaining -= len; |
| 751 | cnt = len; |
| 752 | break; |
| 753 | } |
| 754 | |
| 755 | read_loop(fd, line, 4); |
| 756 | tag = IVAL(line, 0); |
| 757 | |
| 758 | msg_bytes = tag & 0xFFFFFF; |
| 759 | tag = (tag >> 24) - MPLEX_BASE; |
| 760 | |
| 761 | switch (tag) { |
| 762 | case MSG_DATA: |
| 763 | if (msg_bytes > iobuf_in_siz) { |
| 764 | if (!(iobuf_in = realloc_array(iobuf_in, char, |
| 765 | msg_bytes))) |
| 766 | out_of_memory("readfd_unbuffered"); |
| 767 | iobuf_in_siz = msg_bytes; |
| 768 | } |
| 769 | read_loop(fd, iobuf_in, msg_bytes); |
| 770 | remaining = msg_bytes; |
| 771 | iobuf_in_ndx = 0; |
| 772 | break; |
| 773 | case MSG_DELETED: |
| 774 | if (msg_bytes >= sizeof line) |
| 775 | goto overflow; |
| 776 | read_loop(fd, line, msg_bytes); |
| 777 | line[msg_bytes] = '\0'; |
| 778 | /* A directory name was sent with the trailing null */ |
| 779 | if (msg_bytes > 0 && !line[msg_bytes-1]) |
| 780 | log_delete(line, S_IFDIR); |
| 781 | else |
| 782 | log_delete(line, S_IFREG); |
| 783 | break; |
| 784 | case MSG_SUCCESS: |
| 785 | if (msg_bytes != 4) { |
| 786 | rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", |
| 787 | tag, (long)msg_bytes, who_am_i()); |
| 788 | exit_cleanup(RERR_STREAMIO); |
| 789 | } |
| 790 | read_loop(fd, line, msg_bytes); |
| 791 | successful_send(IVAL(line, 0)); |
| 792 | break; |
| 793 | case MSG_INFO: |
| 794 | case MSG_ERROR: |
| 795 | if (msg_bytes >= sizeof line) { |
| 796 | overflow: |
| 797 | rprintf(FERROR, |
| 798 | "multiplexing overflow %d:%ld [%s]\n", |
| 799 | tag, (long)msg_bytes, who_am_i()); |
| 800 | exit_cleanup(RERR_STREAMIO); |
| 801 | } |
| 802 | read_loop(fd, line, msg_bytes); |
| 803 | rwrite((enum logcode)tag, line, msg_bytes); |
| 804 | break; |
| 805 | default: |
| 806 | rprintf(FERROR, "unexpected tag %d [%s]\n", |
| 807 | tag, who_am_i()); |
| 808 | exit_cleanup(RERR_STREAMIO); |
| 809 | } |
| 810 | } |
| 811 | |
| 812 | if (remaining == 0) |
| 813 | io_flush(NORMAL_FLUSH); |
| 814 | |
| 815 | return cnt; |
| 816 | } |
| 817 | |
| 818 | /** |
| 819 | * Do a buffered read from @p fd. Don't return until all @p n bytes |
| 820 | * have been read. If all @p n can't be read then exit with an |
| 821 | * error. |
| 822 | **/ |
| 823 | static void readfd(int fd, char *buffer, size_t N) |
| 824 | { |
| 825 | int cnt; |
| 826 | size_t total = 0; |
| 827 | |
| 828 | while (total < N) { |
| 829 | cnt = readfd_unbuffered(fd, buffer + total, N-total); |
| 830 | total += cnt; |
| 831 | } |
| 832 | |
| 833 | if (fd == write_batch_monitor_in) { |
| 834 | if ((size_t)write(batch_fd, buffer, total) != total) |
| 835 | exit_cleanup(RERR_FILEIO); |
| 836 | } |
| 837 | |
| 838 | if (fd == sock_f_in) |
| 839 | stats.total_read += total; |
| 840 | } |
| 841 | |
| 842 | int read_shortint(int f) |
| 843 | { |
| 844 | uchar b[2]; |
| 845 | readfd(f, (char *)b, 2); |
| 846 | return (b[1] << 8) + b[0]; |
| 847 | } |
| 848 | |
| 849 | int32 read_int(int f) |
| 850 | { |
| 851 | char b[4]; |
| 852 | int32 num; |
| 853 | |
| 854 | readfd(f,b,4); |
| 855 | num = IVAL(b,0); |
| 856 | if (num == (int32)0xffffffff) |
| 857 | return -1; |
| 858 | return num; |
| 859 | } |
| 860 | |
| 861 | int64 read_longint(int f) |
| 862 | { |
| 863 | int64 num; |
| 864 | char b[8]; |
| 865 | num = read_int(f); |
| 866 | |
| 867 | if ((int32)num != (int32)0xffffffff) |
| 868 | return num; |
| 869 | |
| 870 | #if SIZEOF_INT64 < 8 |
| 871 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
| 872 | exit_cleanup(RERR_UNSUPPORTED); |
| 873 | #else |
| 874 | readfd(f,b,8); |
| 875 | num = IVAL(b,0) | (((int64)IVAL(b,4))<<32); |
| 876 | #endif |
| 877 | |
| 878 | return num; |
| 879 | } |
| 880 | |
| 881 | void read_buf(int f,char *buf,size_t len) |
| 882 | { |
| 883 | readfd(f,buf,len); |
| 884 | } |
| 885 | |
| 886 | void read_sbuf(int f,char *buf,size_t len) |
| 887 | { |
| 888 | readfd(f, buf, len); |
| 889 | buf[len] = '\0'; |
| 890 | } |
| 891 | |
| 892 | uchar read_byte(int f) |
| 893 | { |
| 894 | uchar c; |
| 895 | readfd(f, (char *)&c, 1); |
| 896 | return c; |
| 897 | } |
| 898 | |
| 899 | int read_vstring(int f, char *buf, int bufsize) |
| 900 | { |
| 901 | int len = read_byte(f); |
| 902 | |
| 903 | if (len & 0x80) |
| 904 | len = (len & ~0x80) * 0x100 + read_byte(f); |
| 905 | |
| 906 | if (len >= bufsize) { |
| 907 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", |
| 908 | len, bufsize - 1); |
| 909 | return -1; |
| 910 | } |
| 911 | |
| 912 | if (len) |
| 913 | readfd(f, buf, len); |
| 914 | buf[len] = '\0'; |
| 915 | return len; |
| 916 | } |
| 917 | |
| 918 | /* Populate a sum_struct with values from the socket. This is |
| 919 | * called by both the sender and the receiver. */ |
| 920 | void read_sum_head(int f, struct sum_struct *sum) |
| 921 | { |
| 922 | sum->count = read_int(f); |
| 923 | sum->blength = read_int(f); |
| 924 | if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { |
| 925 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
| 926 | (long)sum->blength, who_am_i()); |
| 927 | exit_cleanup(RERR_PROTOCOL); |
| 928 | } |
| 929 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); |
| 930 | if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { |
| 931 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
| 932 | sum->s2length, who_am_i()); |
| 933 | exit_cleanup(RERR_PROTOCOL); |
| 934 | } |
| 935 | sum->remainder = read_int(f); |
| 936 | if (sum->remainder < 0 || sum->remainder > sum->blength) { |
| 937 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
| 938 | (long)sum->remainder, who_am_i()); |
| 939 | exit_cleanup(RERR_PROTOCOL); |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | /* Send the values from a sum_struct over the socket. Set sum to |
| 944 | * NULL if there are no checksums to send. This is called by both |
| 945 | * the generator and the sender. */ |
| 946 | void write_sum_head(int f, struct sum_struct *sum) |
| 947 | { |
| 948 | static struct sum_struct null_sum; |
| 949 | |
| 950 | if (sum == NULL) |
| 951 | sum = &null_sum; |
| 952 | |
| 953 | write_int(f, sum->count); |
| 954 | write_int(f, sum->blength); |
| 955 | if (protocol_version >= 27) |
| 956 | write_int(f, sum->s2length); |
| 957 | write_int(f, sum->remainder); |
| 958 | } |
| 959 | |
| 960 | /** |
| 961 | * Sleep after writing to limit I/O bandwidth usage. |
| 962 | * |
| 963 | * @todo Rather than sleeping after each write, it might be better to |
| 964 | * use some kind of averaging. The current algorithm seems to always |
| 965 | * use a bit less bandwidth than specified, because it doesn't make up |
| 966 | * for slow periods. But arguably this is a feature. In addition, we |
| 967 | * ought to take the time used to write the data into account. |
| 968 | * |
| 969 | * During some phases of big transfers (file FOO is uptodate) this is |
| 970 | * called with a small bytes_written every time. As the kernel has to |
| 971 | * round small waits up to guarantee that we actually wait at least the |
| 972 | * requested number of microseconds, this can become grossly inaccurate. |
| 973 | * We therefore keep track of the bytes we've written over time and only |
| 974 | * sleep when the accumulated delay is at least 1 tenth of a second. |
| 975 | **/ |
| 976 | static void sleep_for_bwlimit(int bytes_written) |
| 977 | { |
| 978 | static struct timeval prior_tv; |
| 979 | static long total_written = 0; |
| 980 | struct timeval tv, start_tv; |
| 981 | long elapsed_usec, sleep_usec; |
| 982 | |
| 983 | #define ONE_SEC 1000000L /* # of microseconds in a second */ |
| 984 | |
| 985 | if (!bwlimit) |
| 986 | return; |
| 987 | |
| 988 | total_written += bytes_written; |
| 989 | |
| 990 | gettimeofday(&start_tv, NULL); |
| 991 | if (prior_tv.tv_sec) { |
| 992 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC |
| 993 | + (start_tv.tv_usec - prior_tv.tv_usec); |
| 994 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); |
| 995 | if (total_written < 0) |
| 996 | total_written = 0; |
| 997 | } |
| 998 | |
| 999 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
| 1000 | if (sleep_usec < ONE_SEC / 10) { |
| 1001 | prior_tv = start_tv; |
| 1002 | return; |
| 1003 | } |
| 1004 | |
| 1005 | tv.tv_sec = sleep_usec / ONE_SEC; |
| 1006 | tv.tv_usec = sleep_usec % ONE_SEC; |
| 1007 | select(0, NULL, NULL, NULL, &tv); |
| 1008 | |
| 1009 | gettimeofday(&prior_tv, NULL); |
| 1010 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC |
| 1011 | + (prior_tv.tv_usec - start_tv.tv_usec); |
| 1012 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); |
| 1013 | } |
| 1014 | |
| 1015 | /* Write len bytes to the file descriptor fd, looping as necessary to get |
| 1016 | * the job done and also (in certain circumstances) reading any data on |
| 1017 | * msg_fd_in to avoid deadlock. |
| 1018 | * |
| 1019 | * This function underlies the multiplexing system. The body of the |
| 1020 | * application never calls this function directly. */ |
| 1021 | static void writefd_unbuffered(int fd,char *buf,size_t len) |
| 1022 | { |
| 1023 | size_t n, total = 0; |
| 1024 | fd_set w_fds, r_fds; |
| 1025 | int maxfd, count, cnt, using_r_fds; |
| 1026 | struct timeval tv; |
| 1027 | |
| 1028 | no_flush++; |
| 1029 | |
| 1030 | while (total < len) { |
| 1031 | FD_ZERO(&w_fds); |
| 1032 | FD_SET(fd,&w_fds); |
| 1033 | maxfd = fd; |
| 1034 | |
| 1035 | if (msg_fd_in >= 0 && len-total >= contiguous_write_len) { |
| 1036 | FD_ZERO(&r_fds); |
| 1037 | FD_SET(msg_fd_in,&r_fds); |
| 1038 | if (msg_fd_in > maxfd) |
| 1039 | maxfd = msg_fd_in; |
| 1040 | using_r_fds = 1; |
| 1041 | } else |
| 1042 | using_r_fds = 0; |
| 1043 | |
| 1044 | tv.tv_sec = select_timeout; |
| 1045 | tv.tv_usec = 0; |
| 1046 | |
| 1047 | errno = 0; |
| 1048 | count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, |
| 1049 | &w_fds, NULL, &tv); |
| 1050 | |
| 1051 | if (count <= 0) { |
| 1052 | if (count < 0 && errno == EBADF) |
| 1053 | exit_cleanup(RERR_SOCKETIO); |
| 1054 | check_timeout(); |
| 1055 | continue; |
| 1056 | } |
| 1057 | |
| 1058 | if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) |
| 1059 | read_msg_fd(); |
| 1060 | |
| 1061 | if (!FD_ISSET(fd, &w_fds)) |
| 1062 | continue; |
| 1063 | |
| 1064 | n = len - total; |
| 1065 | if (bwlimit && n > bwlimit_writemax) |
| 1066 | n = bwlimit_writemax; |
| 1067 | cnt = write(fd, buf + total, n); |
| 1068 | |
| 1069 | if (cnt <= 0) { |
| 1070 | if (cnt < 0) { |
| 1071 | if (errno == EINTR) |
| 1072 | continue; |
| 1073 | if (errno == EWOULDBLOCK || errno == EAGAIN) { |
| 1074 | msleep(1); |
| 1075 | continue; |
| 1076 | } |
| 1077 | } |
| 1078 | |
| 1079 | /* Don't try to write errors back across the stream. */ |
| 1080 | if (fd == sock_f_out) |
| 1081 | close_multiplexing_out(); |
| 1082 | rsyserr(FERROR, errno, |
| 1083 | "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]", |
| 1084 | (long)len, io_write_phase, who_am_i()); |
| 1085 | /* If the other side is sending us error messages, try |
| 1086 | * to grab any messages they sent before they died. */ |
| 1087 | while (fd == sock_f_out && io_multiplexing_in) { |
| 1088 | set_io_timeout(30); |
| 1089 | ignore_timeout = 0; |
| 1090 | readfd_unbuffered(sock_f_in, io_filesfrom_buf, |
| 1091 | sizeof io_filesfrom_buf); |
| 1092 | } |
| 1093 | exit_cleanup(RERR_STREAMIO); |
| 1094 | } |
| 1095 | |
| 1096 | total += cnt; |
| 1097 | |
| 1098 | if (fd == sock_f_out) { |
| 1099 | if (io_timeout || am_generator) |
| 1100 | last_io_out = time(NULL); |
| 1101 | sleep_for_bwlimit(cnt); |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | no_flush--; |
| 1106 | } |
| 1107 | |
| 1108 | /** |
| 1109 | * Write an message to a multiplexed stream. If this fails then rsync |
| 1110 | * exits. |
| 1111 | **/ |
| 1112 | static void mplex_write(enum msgcode code, char *buf, size_t len) |
| 1113 | { |
| 1114 | char buffer[BIGPATHBUFLEN]; |
| 1115 | size_t n = len; |
| 1116 | |
| 1117 | SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
| 1118 | |
| 1119 | /* When the generator reads messages from the msg_fd_in pipe, it can |
| 1120 | * cause output to occur down the socket. Setting contiguous_write_len |
| 1121 | * prevents the reading of msg_fd_in once we actually start to write |
| 1122 | * this sequence of data (though we might read it before the start). */ |
| 1123 | if (am_generator && msg_fd_in >= 0) |
| 1124 | contiguous_write_len = len + 4; |
| 1125 | |
| 1126 | if (n > sizeof buffer - 4) |
| 1127 | n = sizeof buffer - 4; |
| 1128 | |
| 1129 | memcpy(&buffer[4], buf, n); |
| 1130 | writefd_unbuffered(sock_f_out, buffer, n+4); |
| 1131 | |
| 1132 | len -= n; |
| 1133 | buf += n; |
| 1134 | |
| 1135 | if (len) |
| 1136 | writefd_unbuffered(sock_f_out, buf, len); |
| 1137 | |
| 1138 | if (am_generator && msg_fd_in >= 0) |
| 1139 | contiguous_write_len = 0; |
| 1140 | } |
| 1141 | |
| 1142 | void io_flush(int flush_it_all) |
| 1143 | { |
| 1144 | msg_list_flush(flush_it_all); |
| 1145 | |
| 1146 | if (!iobuf_out_cnt || no_flush) |
| 1147 | return; |
| 1148 | |
| 1149 | if (io_multiplexing_out) |
| 1150 | mplex_write(MSG_DATA, iobuf_out, iobuf_out_cnt); |
| 1151 | else |
| 1152 | writefd_unbuffered(sock_f_out, iobuf_out, iobuf_out_cnt); |
| 1153 | iobuf_out_cnt = 0; |
| 1154 | } |
| 1155 | |
| 1156 | static void writefd(int fd,char *buf,size_t len) |
| 1157 | { |
| 1158 | if (fd == msg_fd_out) { |
| 1159 | rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); |
| 1160 | exit_cleanup(RERR_PROTOCOL); |
| 1161 | } |
| 1162 | |
| 1163 | if (fd == sock_f_out) |
| 1164 | stats.total_written += len; |
| 1165 | |
| 1166 | if (fd == write_batch_monitor_out) { |
| 1167 | if ((size_t)write(batch_fd, buf, len) != len) |
| 1168 | exit_cleanup(RERR_FILEIO); |
| 1169 | } |
| 1170 | |
| 1171 | if (!iobuf_out || fd != sock_f_out) { |
| 1172 | writefd_unbuffered(fd, buf, len); |
| 1173 | return; |
| 1174 | } |
| 1175 | |
| 1176 | while (len) { |
| 1177 | int n = MIN((int)len, IO_BUFFER_SIZE - iobuf_out_cnt); |
| 1178 | if (n > 0) { |
| 1179 | memcpy(iobuf_out+iobuf_out_cnt, buf, n); |
| 1180 | buf += n; |
| 1181 | len -= n; |
| 1182 | iobuf_out_cnt += n; |
| 1183 | } |
| 1184 | |
| 1185 | if (iobuf_out_cnt == IO_BUFFER_SIZE) |
| 1186 | io_flush(NORMAL_FLUSH); |
| 1187 | } |
| 1188 | } |
| 1189 | |
| 1190 | void write_shortint(int f, int x) |
| 1191 | { |
| 1192 | uchar b[2]; |
| 1193 | b[0] = x; |
| 1194 | b[1] = x >> 8; |
| 1195 | writefd(f, (char *)b, 2); |
| 1196 | } |
| 1197 | |
| 1198 | void write_int(int f,int32 x) |
| 1199 | { |
| 1200 | char b[4]; |
| 1201 | SIVAL(b,0,x); |
| 1202 | writefd(f,b,4); |
| 1203 | } |
| 1204 | |
| 1205 | void write_int_named(int f, int32 x, const char *phase) |
| 1206 | { |
| 1207 | io_write_phase = phase; |
| 1208 | write_int(f, x); |
| 1209 | io_write_phase = phase_unknown; |
| 1210 | } |
| 1211 | |
| 1212 | /* |
| 1213 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any |
| 1214 | * 64-bit types on this platform. |
| 1215 | */ |
| 1216 | void write_longint(int f, int64 x) |
| 1217 | { |
| 1218 | char b[8]; |
| 1219 | |
| 1220 | if (x <= 0x7FFFFFFF) { |
| 1221 | write_int(f, (int)x); |
| 1222 | return; |
| 1223 | } |
| 1224 | |
| 1225 | #if SIZEOF_INT64 < 8 |
| 1226 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
| 1227 | exit_cleanup(RERR_UNSUPPORTED); |
| 1228 | #else |
| 1229 | write_int(f, (int32)0xFFFFFFFF); |
| 1230 | SIVAL(b,0,(x&0xFFFFFFFF)); |
| 1231 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); |
| 1232 | |
| 1233 | writefd(f,b,8); |
| 1234 | #endif |
| 1235 | } |
| 1236 | |
| 1237 | void write_buf(int f,char *buf,size_t len) |
| 1238 | { |
| 1239 | writefd(f,buf,len); |
| 1240 | } |
| 1241 | |
| 1242 | /** Write a string to the connection */ |
| 1243 | void write_sbuf(int f, char *buf) |
| 1244 | { |
| 1245 | writefd(f, buf, strlen(buf)); |
| 1246 | } |
| 1247 | |
| 1248 | void write_byte(int f, uchar c) |
| 1249 | { |
| 1250 | writefd(f, (char *)&c, 1); |
| 1251 | } |
| 1252 | |
| 1253 | void write_vstring(int f, char *str, int len) |
| 1254 | { |
| 1255 | uchar lenbuf[3], *lb = lenbuf; |
| 1256 | |
| 1257 | if (len > 0x7F) { |
| 1258 | if (len > 0x7FFF) { |
| 1259 | rprintf(FERROR, |
| 1260 | "attempting to send over-long vstring (%d > %d)\n", |
| 1261 | len, 0x7FFF); |
| 1262 | exit_cleanup(RERR_PROTOCOL); |
| 1263 | } |
| 1264 | *lb++ = len / 0x100 + 0x80; |
| 1265 | } |
| 1266 | *lb = len; |
| 1267 | |
| 1268 | writefd(f, (char*)lenbuf, lb - lenbuf + 1); |
| 1269 | if (len) |
| 1270 | writefd(f, str, len); |
| 1271 | } |
| 1272 | |
| 1273 | /** |
| 1274 | * Read a line of up to @p maxlen characters into @p buf (not counting |
| 1275 | * the trailing null). Strips the (required) trailing newline and all |
| 1276 | * carriage returns. |
| 1277 | * |
| 1278 | * @return 1 for success; 0 for I/O error or truncation. |
| 1279 | **/ |
| 1280 | int read_line(int f, char *buf, size_t maxlen) |
| 1281 | { |
| 1282 | while (maxlen) { |
| 1283 | buf[0] = 0; |
| 1284 | read_buf(f, buf, 1); |
| 1285 | if (buf[0] == 0) |
| 1286 | return 0; |
| 1287 | if (buf[0] == '\n') |
| 1288 | break; |
| 1289 | if (buf[0] != '\r') { |
| 1290 | buf++; |
| 1291 | maxlen--; |
| 1292 | } |
| 1293 | } |
| 1294 | *buf = '\0'; |
| 1295 | return maxlen > 0; |
| 1296 | } |
| 1297 | |
| 1298 | void io_printf(int fd, const char *format, ...) |
| 1299 | { |
| 1300 | va_list ap; |
| 1301 | char buf[BIGPATHBUFLEN]; |
| 1302 | int len; |
| 1303 | |
| 1304 | va_start(ap, format); |
| 1305 | len = vsnprintf(buf, sizeof buf, format, ap); |
| 1306 | va_end(ap); |
| 1307 | |
| 1308 | if (len < 0) |
| 1309 | exit_cleanup(RERR_STREAMIO); |
| 1310 | |
| 1311 | if (len > (int)sizeof buf) { |
| 1312 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); |
| 1313 | exit_cleanup(RERR_STREAMIO); |
| 1314 | } |
| 1315 | |
| 1316 | write_sbuf(fd, buf); |
| 1317 | } |
| 1318 | |
| 1319 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
| 1320 | void io_start_multiplex_out(void) |
| 1321 | { |
| 1322 | io_flush(NORMAL_FLUSH); |
| 1323 | io_start_buffering_out(); |
| 1324 | io_multiplexing_out = 1; |
| 1325 | } |
| 1326 | |
| 1327 | /** Setup for multiplexing a MSG_* stream with the data stream. */ |
| 1328 | void io_start_multiplex_in(void) |
| 1329 | { |
| 1330 | io_flush(NORMAL_FLUSH); |
| 1331 | io_start_buffering_in(); |
| 1332 | io_multiplexing_in = 1; |
| 1333 | } |
| 1334 | |
| 1335 | /** Write an message to the multiplexed data stream. */ |
| 1336 | int io_multiplex_write(enum msgcode code, char *buf, size_t len) |
| 1337 | { |
| 1338 | if (!io_multiplexing_out) |
| 1339 | return 0; |
| 1340 | |
| 1341 | io_flush(NORMAL_FLUSH); |
| 1342 | stats.total_written += (len+4); |
| 1343 | mplex_write(code, buf, len); |
| 1344 | return 1; |
| 1345 | } |
| 1346 | |
| 1347 | void close_multiplexing_in(void) |
| 1348 | { |
| 1349 | io_multiplexing_in = 0; |
| 1350 | } |
| 1351 | |
| 1352 | /** Stop output multiplexing. */ |
| 1353 | void close_multiplexing_out(void) |
| 1354 | { |
| 1355 | io_multiplexing_out = 0; |
| 1356 | } |
| 1357 | |
| 1358 | void start_write_batch(int fd) |
| 1359 | { |
| 1360 | write_stream_flags(batch_fd); |
| 1361 | |
| 1362 | /* Some communication has already taken place, but we don't |
| 1363 | * enable batch writing until here so that we can write a |
| 1364 | * canonical record of the communication even though the |
| 1365 | * actual communication so far depends on whether a daemon |
| 1366 | * is involved. */ |
| 1367 | write_int(batch_fd, protocol_version); |
| 1368 | write_int(batch_fd, checksum_seed); |
| 1369 | |
| 1370 | if (am_sender) |
| 1371 | write_batch_monitor_out = fd; |
| 1372 | else |
| 1373 | write_batch_monitor_in = fd; |
| 1374 | } |
| 1375 | |
| 1376 | void stop_write_batch(void) |
| 1377 | { |
| 1378 | write_batch_monitor_out = -1; |
| 1379 | write_batch_monitor_in = -1; |
| 1380 | } |