| 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 | #include "inums.h" |
| 33 | |
| 34 | /** If no timeout is specified then use a 60 second select timeout */ |
| 35 | #define SELECT_TIMEOUT 60 |
| 36 | |
| 37 | extern int bwlimit; |
| 38 | extern size_t bwlimit_writemax; |
| 39 | extern int io_timeout; |
| 40 | extern int am_server; |
| 41 | extern int am_sender; |
| 42 | extern int am_receiver; |
| 43 | extern int am_generator; |
| 44 | extern int msgs2stderr; |
| 45 | extern int inc_recurse; |
| 46 | extern int io_error; |
| 47 | extern int eol_nulls; |
| 48 | extern int flist_eof; |
| 49 | extern int file_total; |
| 50 | extern int file_old_total; |
| 51 | extern int list_only; |
| 52 | extern int read_batch; |
| 53 | extern int compat_flags; |
| 54 | extern int protect_args; |
| 55 | extern int checksum_seed; |
| 56 | extern int protocol_version; |
| 57 | extern int remove_source_files; |
| 58 | extern int preserve_hard_links; |
| 59 | extern BOOL extra_flist_sending_enabled; |
| 60 | extern struct stats stats; |
| 61 | extern struct file_list *cur_flist; |
| 62 | #ifdef ICONV_OPTION |
| 63 | extern int filesfrom_convert; |
| 64 | extern iconv_t ic_send, ic_recv; |
| 65 | #endif |
| 66 | |
| 67 | int csum_length = SHORT_SUM_LENGTH; /* initial value */ |
| 68 | int allowed_lull = 0; |
| 69 | int batch_fd = -1; |
| 70 | int msgdone_cnt = 0; |
| 71 | int forward_flist_data = 0; |
| 72 | BOOL flist_receiving_enabled = False; |
| 73 | |
| 74 | /* Ignore an EOF error if non-zero. See whine_about_eof(). */ |
| 75 | int kluge_around_eof = 0; |
| 76 | |
| 77 | int sock_f_in = -1; |
| 78 | int sock_f_out = -1; |
| 79 | |
| 80 | int64 total_data_read = 0; |
| 81 | int64 total_data_written = 0; |
| 82 | |
| 83 | static struct { |
| 84 | xbuf in, out, msg; |
| 85 | int in_fd; |
| 86 | int out_fd; /* Both "out" and "msg" go to this fd. */ |
| 87 | int in_multiplexed; |
| 88 | unsigned out_empty_len; |
| 89 | size_t raw_data_header_pos; /* in the out xbuf */ |
| 90 | size_t raw_flushing_ends_before; /* in the out xbuf */ |
| 91 | size_t raw_input_ends_before; /* in the in xbuf */ |
| 92 | } iobuf = { .in_fd = -1, .out_fd = -1 }; |
| 93 | |
| 94 | static time_t last_io_in; |
| 95 | static time_t last_io_out; |
| 96 | |
| 97 | static int write_batch_monitor_in = -1; |
| 98 | static int write_batch_monitor_out = -1; |
| 99 | |
| 100 | static int ff_forward_fd = -1; |
| 101 | static int ff_reenable_multiplex = -1; |
| 102 | static char ff_lastchar = '\0'; |
| 103 | static xbuf ff_xb = EMPTY_XBUF; |
| 104 | #ifdef ICONV_OPTION |
| 105 | static xbuf iconv_buf = EMPTY_XBUF; |
| 106 | #endif |
| 107 | static int select_timeout = SELECT_TIMEOUT; |
| 108 | static int active_filecnt = 0; |
| 109 | static OFF_T active_bytecnt = 0; |
| 110 | static int first_message = 1; |
| 111 | |
| 112 | static char int_byte_extra[64] = { |
| 113 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */ |
| 114 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */ |
| 115 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */ |
| 116 | 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */ |
| 117 | }; |
| 118 | |
| 119 | /* Our I/O buffers are sized with no bits on in the lowest byte of the "size" |
| 120 | * (indeed, our rounding of sizes in 1024-byte units assures more than this). |
| 121 | * This allows the code that is storing bytes near the physical end of a |
| 122 | * circular buffer to temporarily reduce the buffer's size (in order to make |
| 123 | * some storing idioms easier), while also making it simple to restore the |
| 124 | * buffer's actual size when the buffer's "pos" wraps around to the start (we |
| 125 | * just round the buffer's size up again). */ |
| 126 | |
| 127 | #define IOBUF_WAS_REDUCED(siz) ((siz) & 0xFF) |
| 128 | #define IOBUF_RESTORE_SIZE(siz) (((siz) | 0xFF) + 1) |
| 129 | |
| 130 | #define IN_MULTIPLEXED (iobuf.in_multiplexed != 0) |
| 131 | #define IN_MULTIPLEXED_AND_READY (iobuf.in_multiplexed > 0) |
| 132 | #define OUT_MULTIPLEXED (iobuf.out_empty_len != 0) |
| 133 | |
| 134 | #define PIO_NEED_INPUT (1<<0) /* The *_NEED_* flags are mutually exclusive. */ |
| 135 | #define PIO_NEED_OUTROOM (1<<1) |
| 136 | #define PIO_NEED_MSGROOM (1<<2) |
| 137 | |
| 138 | #define PIO_CONSUME_INPUT (1<<4) /* Must becombined with PIO_NEED_INPUT. */ |
| 139 | |
| 140 | #define PIO_INPUT_AND_CONSUME (PIO_NEED_INPUT | PIO_CONSUME_INPUT) |
| 141 | #define PIO_NEED_FLAGS (PIO_NEED_INPUT | PIO_NEED_OUTROOM | PIO_NEED_MSGROOM) |
| 142 | |
| 143 | #define REMOTE_OPTION_ERROR "rsync: on remote machine: -" |
| 144 | #define REMOTE_OPTION_ERROR2 ": unknown option" |
| 145 | |
| 146 | #define FILESFROM_BUFLEN 2048 |
| 147 | |
| 148 | enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND }; |
| 149 | |
| 150 | static flist_ndx_list redo_list, hlink_list; |
| 151 | |
| 152 | static void read_a_msg(void); |
| 153 | static void drain_multiplex_messages(void); |
| 154 | static void sleep_for_bwlimit(int bytes_written); |
| 155 | |
| 156 | static void check_timeout(BOOL allow_keepalive) |
| 157 | { |
| 158 | time_t t, chk; |
| 159 | |
| 160 | /* On the receiving side, the generator is now the one that decides |
| 161 | * when a timeout has occurred. When it is sifting through a lot of |
| 162 | * files looking for work, it will be sending keep-alive messages to |
| 163 | * the sender, and even though the receiver won't be sending/receiving |
| 164 | * anything (not even keep-alive messages), the successful writes to |
| 165 | * the sender will keep things going. If the receiver is actively |
| 166 | * receiving data, it will ensure that the generator knows that it is |
| 167 | * not idle by sending the generator keep-alive messages (since the |
| 168 | * generator might be blocked trying to send checksums, it needs to |
| 169 | * know that the receiver is active). Thus, as long as one or the |
| 170 | * other is successfully doing work, the generator will not timeout. */ |
| 171 | if (!io_timeout) |
| 172 | return; |
| 173 | |
| 174 | t = time(NULL); |
| 175 | |
| 176 | if (allow_keepalive) { |
| 177 | /* This may put data into iobuf.msg w/o flushing. */ |
| 178 | maybe_send_keepalive(t, 0); |
| 179 | } |
| 180 | |
| 181 | if (!last_io_in) |
| 182 | last_io_in = t; |
| 183 | |
| 184 | if (am_receiver) |
| 185 | return; |
| 186 | |
| 187 | chk = MAX(last_io_out, last_io_in); |
| 188 | if (t - chk >= io_timeout) { |
| 189 | if (am_server) |
| 190 | msgs2stderr = 1; |
| 191 | rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n", |
| 192 | who_am_i(), (int)(t-chk)); |
| 193 | exit_cleanup(RERR_TIMEOUT); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /* It's almost always an error to get an EOF when we're trying to read from the |
| 198 | * network, because the protocol is (for the most part) self-terminating. |
| 199 | * |
| 200 | * There is one case for the receiver when it is at the end of the transfer |
| 201 | * (hanging around reading any keep-alive packets that might come its way): if |
| 202 | * the sender dies before the generator's kill-signal comes through, we can end |
| 203 | * up here needing to loop until the kill-signal arrives. In this situation, |
| 204 | * kluge_around_eof will be < 0. |
| 205 | * |
| 206 | * There is another case for older protocol versions (< 24) where the module |
| 207 | * listing was not terminated, so we must ignore an EOF error in that case and |
| 208 | * exit. In this situation, kluge_around_eof will be > 0. */ |
| 209 | static NORETURN void whine_about_eof(BOOL allow_kluge) |
| 210 | { |
| 211 | if (kluge_around_eof && allow_kluge) { |
| 212 | int i; |
| 213 | if (kluge_around_eof > 0) |
| 214 | exit_cleanup(0); |
| 215 | /* If we're still here after 10 seconds, exit with an error. */ |
| 216 | for (i = 10*1000/20; i--; ) |
| 217 | msleep(20); |
| 218 | } |
| 219 | |
| 220 | rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed " |
| 221 | "(%s bytes received so far) [%s]\n", |
| 222 | big_num(stats.total_read), who_am_i()); |
| 223 | |
| 224 | exit_cleanup(RERR_STREAMIO); |
| 225 | } |
| 226 | |
| 227 | /* Do a safe read, handling any needed looping and error handling. |
| 228 | * Returns the count of the bytes read, which will only be different |
| 229 | * from "len" if we encountered an EOF. This routine is not used on |
| 230 | * the socket except very early in the transfer. */ |
| 231 | static size_t safe_read(int fd, char *buf, size_t len) |
| 232 | { |
| 233 | size_t got; |
| 234 | int n; |
| 235 | |
| 236 | assert(fd != iobuf.in_fd); |
| 237 | |
| 238 | n = read(fd, buf, len); |
| 239 | if ((size_t)n == len || n == 0) { |
| 240 | if (DEBUG_GTE(IO, 2)) |
| 241 | rprintf(FINFO, "[%s] safe_read(%d)=%ld\n", who_am_i(), fd, (long)n); |
| 242 | return n; |
| 243 | } |
| 244 | if (n < 0) { |
| 245 | if (errno != EINTR && errno != EWOULDBLOCK && errno != EAGAIN) { |
| 246 | read_failed: |
| 247 | rsyserr(FERROR, errno, "safe_read failed to read %ld bytes [%s]", |
| 248 | (long)len, who_am_i()); |
| 249 | exit_cleanup(RERR_STREAMIO); |
| 250 | } |
| 251 | got = 0; |
| 252 | } else |
| 253 | got = n; |
| 254 | |
| 255 | while (1) { |
| 256 | struct timeval tv; |
| 257 | fd_set r_fds, e_fds; |
| 258 | int cnt; |
| 259 | |
| 260 | FD_ZERO(&r_fds); |
| 261 | FD_SET(fd, &r_fds); |
| 262 | FD_ZERO(&e_fds); |
| 263 | FD_SET(fd, &e_fds); |
| 264 | tv.tv_sec = select_timeout; |
| 265 | tv.tv_usec = 0; |
| 266 | |
| 267 | cnt = select(fd+1, &r_fds, NULL, &e_fds, &tv); |
| 268 | if (cnt <= 0) { |
| 269 | if (cnt < 0 && errno == EBADF) { |
| 270 | rsyserr(FERROR, errno, "safe_read select failed [%s]", |
| 271 | who_am_i()); |
| 272 | exit_cleanup(RERR_FILEIO); |
| 273 | } |
| 274 | if (io_timeout) |
| 275 | maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH); |
| 276 | continue; |
| 277 | } |
| 278 | |
| 279 | /*if (FD_ISSET(fd, &e_fds)) |
| 280 | rprintf(FINFO, "select exception on fd %d\n", fd); */ |
| 281 | |
| 282 | if (FD_ISSET(fd, &r_fds)) { |
| 283 | n = read(fd, buf + got, len - got); |
| 284 | if (DEBUG_GTE(IO, 2)) |
| 285 | rprintf(FINFO, "[%s] safe_read(%d)=%ld\n", who_am_i(), fd, (long)n); |
| 286 | if (n == 0) |
| 287 | break; |
| 288 | if (n < 0) { |
| 289 | if (errno == EINTR) |
| 290 | continue; |
| 291 | goto read_failed; |
| 292 | } |
| 293 | if ((got += (size_t)n) == len) |
| 294 | break; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | return got; |
| 299 | } |
| 300 | |
| 301 | static const char *what_fd_is(int fd) |
| 302 | { |
| 303 | static char buf[20]; |
| 304 | |
| 305 | if (fd == sock_f_out) |
| 306 | return "socket"; |
| 307 | else if (fd == iobuf.out_fd) |
| 308 | return "message fd"; |
| 309 | else if (fd == batch_fd) |
| 310 | return "batch file"; |
| 311 | else { |
| 312 | snprintf(buf, sizeof buf, "fd %d", fd); |
| 313 | return buf; |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | /* Do a safe write, handling any needed looping and error handling. |
| 318 | * Returns only if everything was successfully written. This routine |
| 319 | * is not used on the socket except very early in the transfer. */ |
| 320 | static void safe_write(int fd, const char *buf, size_t len) |
| 321 | { |
| 322 | int n; |
| 323 | |
| 324 | assert(fd != iobuf.out_fd); |
| 325 | |
| 326 | n = write(fd, buf, len); |
| 327 | if ((size_t)n == len) |
| 328 | return; |
| 329 | if (n < 0) { |
| 330 | if (errno != EINTR && errno != EWOULDBLOCK && errno != EAGAIN) { |
| 331 | write_failed: |
| 332 | rsyserr(FERROR, errno, |
| 333 | "safe_write failed to write %ld bytes to %s [%s]", |
| 334 | (long)len, what_fd_is(fd), who_am_i()); |
| 335 | exit_cleanup(RERR_STREAMIO); |
| 336 | } |
| 337 | } else { |
| 338 | buf += n; |
| 339 | len -= n; |
| 340 | } |
| 341 | |
| 342 | while (len) { |
| 343 | struct timeval tv; |
| 344 | fd_set w_fds; |
| 345 | int cnt; |
| 346 | |
| 347 | FD_ZERO(&w_fds); |
| 348 | FD_SET(fd, &w_fds); |
| 349 | tv.tv_sec = select_timeout; |
| 350 | tv.tv_usec = 0; |
| 351 | |
| 352 | cnt = select(fd + 1, NULL, &w_fds, NULL, &tv); |
| 353 | if (cnt <= 0) { |
| 354 | if (cnt < 0 && errno == EBADF) { |
| 355 | rsyserr(FERROR, errno, "safe_write select failed on %s [%s]", |
| 356 | what_fd_is(fd), who_am_i()); |
| 357 | exit_cleanup(RERR_FILEIO); |
| 358 | } |
| 359 | if (io_timeout) |
| 360 | maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH); |
| 361 | continue; |
| 362 | } |
| 363 | |
| 364 | if (FD_ISSET(fd, &w_fds)) { |
| 365 | n = write(fd, buf, len); |
| 366 | if (n < 0) { |
| 367 | if (errno == EINTR) |
| 368 | continue; |
| 369 | goto write_failed; |
| 370 | } |
| 371 | buf += n; |
| 372 | len -= n; |
| 373 | } |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | /* This is only called when files-from data is known to be available. We read |
| 378 | * a chunk of data and put it into the output buffer. */ |
| 379 | static void forward_filesfrom_data(void) |
| 380 | { |
| 381 | int len; |
| 382 | |
| 383 | len = read(ff_forward_fd, ff_xb.buf + ff_xb.len, ff_xb.size - ff_xb.len); |
| 384 | if (len <= 0) { |
| 385 | if (len == 0 || errno != EINTR) { |
| 386 | /* Send end-of-file marker */ |
| 387 | ff_forward_fd = -1; |
| 388 | write_buf(iobuf.out_fd, "\0\0", ff_lastchar ? 2 : 1); |
| 389 | free_xbuf(&ff_xb); |
| 390 | if (ff_reenable_multiplex >= 0) |
| 391 | io_start_multiplex_out(ff_reenable_multiplex); |
| 392 | } |
| 393 | return; |
| 394 | } |
| 395 | |
| 396 | if (DEBUG_GTE(IO, 2)) |
| 397 | rprintf(FINFO, "[%s] files-from read=%ld\n", who_am_i(), (long)len); |
| 398 | |
| 399 | #ifdef ICONV_OPTION |
| 400 | len += ff_xb.len; |
| 401 | #endif |
| 402 | |
| 403 | if (!eol_nulls) { |
| 404 | char *s = ff_xb.buf + len; |
| 405 | /* Transform CR and/or LF into '\0' */ |
| 406 | while (s-- > ff_xb.buf) { |
| 407 | if (*s == '\n' || *s == '\r') |
| 408 | *s = '\0'; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | if (ff_lastchar) |
| 413 | ff_xb.pos = 0; |
| 414 | else { |
| 415 | char *s = ff_xb.buf; |
| 416 | /* Last buf ended with a '\0', so don't let this buf start with one. */ |
| 417 | while (len && *s == '\0') |
| 418 | s++, len--; |
| 419 | ff_xb.pos = s - ff_xb.buf; |
| 420 | } |
| 421 | |
| 422 | #ifdef ICONV_OPTION |
| 423 | if (filesfrom_convert && len) { |
| 424 | char *sob = ff_xb.buf + ff_xb.pos, *s = sob; |
| 425 | char *eob = sob + len; |
| 426 | int flags = ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_CIRCULAR_OUT; |
| 427 | if (ff_lastchar == '\0') |
| 428 | flags |= ICB_INIT; |
| 429 | /* Convert/send each null-terminated string separately, skipping empties. */ |
| 430 | while (s != eob) { |
| 431 | if (*s++ == '\0') { |
| 432 | ff_xb.len = s - sob - 1; |
| 433 | if (iconvbufs(ic_send, &ff_xb, &iobuf.out, flags) < 0) |
| 434 | exit_cleanup(RERR_PROTOCOL); /* impossible? */ |
| 435 | write_buf(iobuf.out_fd, s-1, 1); /* Send the '\0'. */ |
| 436 | while (s != eob && *s == '\0') |
| 437 | s++; |
| 438 | sob = s; |
| 439 | ff_xb.pos = sob - ff_xb.buf; |
| 440 | flags |= ICB_INIT; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | if ((ff_xb.len = s - sob) == 0) |
| 445 | ff_lastchar = '\0'; |
| 446 | else { |
| 447 | /* Handle a partial string specially, saving any incomplete chars. */ |
| 448 | flags &= ~ICB_INCLUDE_INCOMPLETE; |
| 449 | if (iconvbufs(ic_send, &ff_xb, &iobuf.out, flags) < 0) { |
| 450 | if (errno == E2BIG) |
| 451 | exit_cleanup(RERR_PROTOCOL); /* impossible? */ |
| 452 | if (ff_xb.pos) |
| 453 | memmove(ff_xb.buf, ff_xb.buf + ff_xb.pos, ff_xb.len); |
| 454 | } |
| 455 | ff_lastchar = 'x'; /* Anything non-zero. */ |
| 456 | } |
| 457 | } else |
| 458 | #endif |
| 459 | |
| 460 | if (len) { |
| 461 | char *f = ff_xb.buf + ff_xb.pos; |
| 462 | char *t = ff_xb.buf; |
| 463 | char *eob = f + len; |
| 464 | /* Eliminate any multi-'\0' runs. */ |
| 465 | while (f != eob) { |
| 466 | if (!(*t++ = *f++)) { |
| 467 | while (f != eob && *f == '\0') |
| 468 | f++; |
| 469 | } |
| 470 | } |
| 471 | ff_lastchar = f[-1]; |
| 472 | if ((len = t - ff_xb.buf) != 0) { |
| 473 | /* This will not circle back to perform_io() because we only get |
| 474 | * called when there is plenty of room in the output buffer. */ |
| 475 | write_buf(iobuf.out_fd, ff_xb.buf, len); |
| 476 | } |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | void reduce_iobuf_size(xbuf *out, size_t new_size) |
| 481 | { |
| 482 | if (new_size < out->size) { |
| 483 | if (DEBUG_GTE(IO, 4)) { |
| 484 | const char *name = out == &iobuf.out ? "iobuf.out" |
| 485 | : out == &iobuf.msg ? "iobuf.msg" |
| 486 | : NULL; |
| 487 | if (name) { |
| 488 | rprintf(FINFO, "[%s] reduced size of %s (-%d)\n", |
| 489 | who_am_i(), name, (int)(out->size - new_size)); |
| 490 | } |
| 491 | } |
| 492 | out->size = new_size; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | void restore_iobuf_size(xbuf *out) |
| 497 | { |
| 498 | if (IOBUF_WAS_REDUCED(out->size)) { |
| 499 | size_t new_size = IOBUF_RESTORE_SIZE(out->size); |
| 500 | if (DEBUG_GTE(IO, 4)) { |
| 501 | const char *name = out == &iobuf.out ? "iobuf.out" |
| 502 | : out == &iobuf.msg ? "iobuf.msg" |
| 503 | : NULL; |
| 504 | if (name) { |
| 505 | rprintf(FINFO, "[%s] restored size of %s (+%d)\n", |
| 506 | who_am_i(), name, (int)(new_size - out->size)); |
| 507 | } |
| 508 | } |
| 509 | out->size = new_size; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | /* Perform buffered input and/or output until specified conditions are met. |
| 514 | * When given a "needed" read or write request, this returns without doing any |
| 515 | * I/O if the needed input bytes or write space is already available. Once I/O |
| 516 | * is needed, this will try to do whatever reading and/or writing is currently |
| 517 | * possible, up to the maximum buffer allowances, no matter if this is a read |
| 518 | * or write request. However, the I/O stops as soon as the required input |
| 519 | * bytes or output space is available. If this is not a read request, the |
| 520 | * routine may also do some advantageous reading of messages from a multiplexed |
| 521 | * input source (which ensures that we don't jam up with everyone in their |
| 522 | * "need to write" code and nobody reading the accumulated data that would make |
| 523 | * writing possible). |
| 524 | * |
| 525 | * The iobuf.in, .out and .msg buffers are all circular. Callers need to be |
| 526 | * aware that some data copies will need to be split when the bytes wrap around |
| 527 | * from the end to the start. In order to help make writing into the output |
| 528 | * buffers easier for some operations (such as the use of SIVAL() into the |
| 529 | * buffer) a buffer may be temporarily shortened by a small amount, but the |
| 530 | * original size will be automatically restored when the .pos wraps to the |
| 531 | * start. See also the 3 raw_* iobuf vars that are used in the handling of |
| 532 | * MSG_DATA bytes as they are read-from/written-into the buffers. |
| 533 | * |
| 534 | * When writing, we flush data in the following priority order: |
| 535 | * |
| 536 | * 1. Finish writing any in-progress MSG_DATA sequence from iobuf.out. |
| 537 | * |
| 538 | * 2. Write out all the messages from the message buf (if iobuf.msg is active). |
| 539 | * Yes, this means that a PIO_NEED_OUTROOM call will completely flush any |
| 540 | * messages before getting to the iobuf.out flushing (except for rule 1). |
| 541 | * |
| 542 | * 3. Write out the raw data from iobuf.out, possibly filling in the multiplexed |
| 543 | * MSG_DATA header that was pre-allocated (when output is multiplexed). |
| 544 | * |
| 545 | * TODO: items for possible future work: |
| 546 | * |
| 547 | * - Make this routine able to read the generator-to-receiver batch flow? |
| 548 | * |
| 549 | * Unlike the old routines that this replaces, it is OK to read ahead as far as |
| 550 | * we can because the read_a_msg() routine now reads its bytes out of the input |
| 551 | * buffer. In the old days, only raw data was in the input buffer, and any |
| 552 | * unused raw data in the buf would prevent the reading of socket data. */ |
| 553 | static char *perform_io(size_t needed, int flags) |
| 554 | { |
| 555 | fd_set r_fds, e_fds, w_fds; |
| 556 | struct timeval tv; |
| 557 | int cnt, max_fd; |
| 558 | size_t empty_buf_len = 0; |
| 559 | xbuf *out; |
| 560 | char *data; |
| 561 | |
| 562 | if (iobuf.in.len == 0 && iobuf.in.pos != 0) { |
| 563 | if (iobuf.raw_input_ends_before) |
| 564 | iobuf.raw_input_ends_before -= iobuf.in.pos; |
| 565 | iobuf.in.pos = 0; |
| 566 | } |
| 567 | |
| 568 | switch (flags & PIO_NEED_FLAGS) { |
| 569 | case PIO_NEED_INPUT: |
| 570 | /* We never resize the circular input buffer. */ |
| 571 | if (iobuf.in.size < needed) { |
| 572 | rprintf(FERROR, "need to read %ld bytes, iobuf.in.buf is only %ld bytes.\n", |
| 573 | (long)needed, (long)iobuf.in.size); |
| 574 | exit_cleanup(RERR_PROTOCOL); |
| 575 | } |
| 576 | |
| 577 | if (DEBUG_GTE(IO, 3)) { |
| 578 | rprintf(FINFO, "[%s] perform_io(%ld, %sinput)\n", |
| 579 | who_am_i(), (long)needed, flags & PIO_CONSUME_INPUT ? "consume&" : ""); |
| 580 | } |
| 581 | break; |
| 582 | |
| 583 | case PIO_NEED_OUTROOM: |
| 584 | /* We never resize the circular output buffer. */ |
| 585 | if (iobuf.out.size - iobuf.out_empty_len < needed) { |
| 586 | fprintf(stderr, "need to write %ld bytes, iobuf.out.buf is only %ld bytes.\n", |
| 587 | (long)needed, (long)(iobuf.out.size - iobuf.out_empty_len)); |
| 588 | exit_cleanup(RERR_PROTOCOL); |
| 589 | } |
| 590 | |
| 591 | if (DEBUG_GTE(IO, 3)) { |
| 592 | rprintf(FINFO, "[%s] perform_io(%ld, outroom) needs to flush %ld\n", |
| 593 | who_am_i(), (long)needed, |
| 594 | iobuf.out.len + needed > iobuf.out.size |
| 595 | ? (long)(iobuf.out.len + needed - iobuf.out.size) : 0L); |
| 596 | } |
| 597 | break; |
| 598 | |
| 599 | case PIO_NEED_MSGROOM: |
| 600 | /* We never resize the circular message buffer. */ |
| 601 | if (iobuf.msg.size < needed) { |
| 602 | fprintf(stderr, "need to write %ld bytes, iobuf.msg.buf is only %ld bytes.\n", |
| 603 | (long)needed, (long)iobuf.msg.size); |
| 604 | exit_cleanup(RERR_PROTOCOL); |
| 605 | } |
| 606 | |
| 607 | if (DEBUG_GTE(IO, 3)) { |
| 608 | rprintf(FINFO, "[%s] perform_io(%ld, msgroom) needs to flush %ld\n", |
| 609 | who_am_i(), (long)needed, |
| 610 | iobuf.msg.len + needed > iobuf.msg.size |
| 611 | ? (long)(iobuf.msg.len + needed - iobuf.msg.size) : 0L); |
| 612 | } |
| 613 | break; |
| 614 | |
| 615 | case 0: |
| 616 | if (DEBUG_GTE(IO, 3)) |
| 617 | rprintf(FINFO, "[%s] perform_io(%ld, %d)\n", who_am_i(), (long)needed, flags); |
| 618 | break; |
| 619 | |
| 620 | default: |
| 621 | exit_cleanup(RERR_UNSUPPORTED); |
| 622 | } |
| 623 | |
| 624 | while (1) { |
| 625 | switch (flags & PIO_NEED_FLAGS) { |
| 626 | case PIO_NEED_INPUT: |
| 627 | if (iobuf.in.len >= needed) |
| 628 | goto double_break; |
| 629 | break; |
| 630 | case PIO_NEED_OUTROOM: |
| 631 | /* Note that iobuf.out_empty_len doesn't factor into this check |
| 632 | * because iobuf.out.len already holds any needed header len. */ |
| 633 | if (iobuf.out.len + needed <= iobuf.out.size) |
| 634 | goto double_break; |
| 635 | break; |
| 636 | case PIO_NEED_MSGROOM: |
| 637 | if (iobuf.msg.len + needed <= iobuf.msg.size) |
| 638 | goto double_break; |
| 639 | break; |
| 640 | } |
| 641 | |
| 642 | max_fd = -1; |
| 643 | |
| 644 | FD_ZERO(&r_fds); |
| 645 | FD_ZERO(&e_fds); |
| 646 | if (iobuf.in_fd >= 0 && iobuf.in.size - iobuf.in.len) { |
| 647 | if (!read_batch || batch_fd >= 0) { |
| 648 | FD_SET(iobuf.in_fd, &r_fds); |
| 649 | FD_SET(iobuf.in_fd, &e_fds); |
| 650 | } |
| 651 | if (iobuf.in_fd > max_fd) |
| 652 | max_fd = iobuf.in_fd; |
| 653 | } |
| 654 | |
| 655 | /* Only do more filesfrom processing if there is enough room in the out buffer. */ |
| 656 | if (ff_forward_fd >= 0 && iobuf.out.size - iobuf.out.len > FILESFROM_BUFLEN*2) { |
| 657 | FD_SET(ff_forward_fd, &r_fds); |
| 658 | if (ff_forward_fd > max_fd) |
| 659 | max_fd = ff_forward_fd; |
| 660 | } |
| 661 | |
| 662 | FD_ZERO(&w_fds); |
| 663 | if (iobuf.out_fd >= 0) { |
| 664 | if (iobuf.raw_flushing_ends_before |
| 665 | || (!iobuf.msg.len && iobuf.out.len > iobuf.out_empty_len && !(flags & PIO_NEED_MSGROOM))) { |
| 666 | if (OUT_MULTIPLEXED && !iobuf.raw_flushing_ends_before) { |
| 667 | /* The iobuf.raw_flushing_ends_before value can point off the end |
| 668 | * of the iobuf.out buffer for a while, for easier subtracting. */ |
| 669 | iobuf.raw_flushing_ends_before = iobuf.out.pos + iobuf.out.len; |
| 670 | |
| 671 | SIVAL(iobuf.out.buf + iobuf.raw_data_header_pos, 0, |
| 672 | ((MPLEX_BASE + (int)MSG_DATA)<<24) + iobuf.out.len - 4); |
| 673 | |
| 674 | if (DEBUG_GTE(IO, 1)) { |
| 675 | rprintf(FINFO, "[%s] send_msg(%d, %ld)\n", |
| 676 | who_am_i(), (int)MSG_DATA, (long)iobuf.out.len - 4); |
| 677 | } |
| 678 | |
| 679 | /* reserve room for the next MSG_DATA header */ |
| 680 | iobuf.raw_data_header_pos = iobuf.raw_flushing_ends_before; |
| 681 | if (iobuf.raw_data_header_pos >= iobuf.out.size) |
| 682 | iobuf.raw_data_header_pos -= iobuf.out.size; |
| 683 | else if (iobuf.raw_data_header_pos + 4 > iobuf.out.size) { |
| 684 | /* The 4-byte header won't fit at the end of the buffer, |
| 685 | * so we'll temporarily reduce the output buffer's size |
| 686 | * and put the header at the start of the buffer. */ |
| 687 | reduce_iobuf_size(&iobuf.out, iobuf.raw_data_header_pos); |
| 688 | iobuf.raw_data_header_pos = 0; |
| 689 | } |
| 690 | /* Yes, it is possible for this to make len > size for a while. */ |
| 691 | iobuf.out.len += 4; |
| 692 | } |
| 693 | |
| 694 | empty_buf_len = iobuf.out_empty_len; |
| 695 | out = &iobuf.out; |
| 696 | } else if (iobuf.msg.len) { |
| 697 | empty_buf_len = 0; |
| 698 | out = &iobuf.msg; |
| 699 | } else |
| 700 | out = NULL; |
| 701 | if (out) { |
| 702 | FD_SET(iobuf.out_fd, &w_fds); |
| 703 | if (iobuf.out_fd > max_fd) |
| 704 | max_fd = iobuf.out_fd; |
| 705 | } |
| 706 | } else |
| 707 | out = NULL; |
| 708 | |
| 709 | if (max_fd < 0) { |
| 710 | switch (flags & PIO_NEED_FLAGS) { |
| 711 | case PIO_NEED_INPUT: |
| 712 | iobuf.in.len = 0; |
| 713 | if (kluge_around_eof == 2) |
| 714 | exit_cleanup(0); |
| 715 | if (iobuf.in_fd == -2) |
| 716 | whine_about_eof(True); |
| 717 | rprintf(FERROR, "error in perform_io: no fd for input.\n"); |
| 718 | exit_cleanup(RERR_PROTOCOL); |
| 719 | case PIO_NEED_OUTROOM: |
| 720 | case PIO_NEED_MSGROOM: |
| 721 | msgs2stderr = 1; |
| 722 | drain_multiplex_messages(); |
| 723 | if (iobuf.out_fd == -2) |
| 724 | whine_about_eof(True); |
| 725 | rprintf(FERROR, "error in perform_io: no fd for output.\n"); |
| 726 | exit_cleanup(RERR_PROTOCOL); |
| 727 | default: |
| 728 | /* No stated needs, so I guess this is OK. */ |
| 729 | break; |
| 730 | } |
| 731 | break; |
| 732 | } |
| 733 | |
| 734 | if (extra_flist_sending_enabled) { |
| 735 | if (file_total - file_old_total < MAX_FILECNT_LOOKAHEAD) |
| 736 | tv.tv_sec = 0; |
| 737 | else { |
| 738 | extra_flist_sending_enabled = False; |
| 739 | tv.tv_sec = select_timeout; |
| 740 | } |
| 741 | } else |
| 742 | tv.tv_sec = select_timeout; |
| 743 | tv.tv_usec = 0; |
| 744 | |
| 745 | cnt = select(max_fd + 1, &r_fds, &w_fds, &e_fds, &tv); |
| 746 | |
| 747 | if (cnt <= 0) { |
| 748 | if (cnt < 0 && errno == EBADF) { |
| 749 | msgs2stderr = 1; |
| 750 | exit_cleanup(RERR_SOCKETIO); |
| 751 | } |
| 752 | if (extra_flist_sending_enabled) { |
| 753 | extra_flist_sending_enabled = False; |
| 754 | send_extra_file_list(sock_f_out, -1); |
| 755 | extra_flist_sending_enabled = !flist_eof; |
| 756 | } else |
| 757 | check_timeout((flags & PIO_NEED_INPUT) != 0); |
| 758 | FD_ZERO(&r_fds); /* Just in case... */ |
| 759 | FD_ZERO(&w_fds); |
| 760 | } |
| 761 | |
| 762 | if (iobuf.in_fd >= 0 && FD_ISSET(iobuf.in_fd, &r_fds)) { |
| 763 | size_t len, pos = iobuf.in.pos + iobuf.in.len; |
| 764 | int n; |
| 765 | if (pos >= iobuf.in.size) { |
| 766 | pos -= iobuf.in.size; |
| 767 | len = iobuf.in.size - iobuf.in.len; |
| 768 | } else |
| 769 | len = iobuf.in.size - pos; |
| 770 | if ((n = read(iobuf.in_fd, iobuf.in.buf + pos, len)) <= 0) { |
| 771 | if (n == 0) { |
| 772 | /* Signal that input has become invalid. */ |
| 773 | if (!read_batch || batch_fd < 0 || am_generator) |
| 774 | iobuf.in_fd = -2; |
| 775 | batch_fd = -1; |
| 776 | continue; |
| 777 | } |
| 778 | if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) |
| 779 | n = 0; |
| 780 | else { |
| 781 | /* Don't write errors on a dead socket. */ |
| 782 | if (iobuf.in_fd == sock_f_in) { |
| 783 | if (am_sender) |
| 784 | msgs2stderr = 1; |
| 785 | rsyserr(FERROR_SOCKET, errno, "read error"); |
| 786 | } else |
| 787 | rsyserr(FERROR, errno, "read error"); |
| 788 | exit_cleanup(RERR_SOCKETIO); |
| 789 | } |
| 790 | } |
| 791 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 792 | rprintf(FINFO, "[%s] recv=%ld\n", who_am_i(), (long)n); |
| 793 | |
| 794 | if (io_timeout) { |
| 795 | last_io_in = time(NULL); |
| 796 | if (flags & PIO_NEED_INPUT) |
| 797 | maybe_send_keepalive(last_io_in, 0); |
| 798 | } |
| 799 | stats.total_read += n; |
| 800 | |
| 801 | iobuf.in.len += n; |
| 802 | } |
| 803 | |
| 804 | if (out && FD_ISSET(iobuf.out_fd, &w_fds)) { |
| 805 | size_t len = iobuf.raw_flushing_ends_before ? iobuf.raw_flushing_ends_before - out->pos : out->len; |
| 806 | int n; |
| 807 | |
| 808 | if (bwlimit_writemax && len > bwlimit_writemax) |
| 809 | len = bwlimit_writemax; |
| 810 | |
| 811 | if (out->pos + len > out->size) |
| 812 | len = out->size - out->pos; |
| 813 | if ((n = write(iobuf.out_fd, out->buf + out->pos, len)) <= 0) { |
| 814 | if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) |
| 815 | n = 0; |
| 816 | else { |
| 817 | /* Don't write errors on a dead socket. */ |
| 818 | msgs2stderr = 1; |
| 819 | iobuf.out_fd = -2; |
| 820 | iobuf.out.len = iobuf.msg.len = iobuf.raw_flushing_ends_before = 0; |
| 821 | rsyserr(FERROR_SOCKET, errno, "[%s] write error", who_am_i()); |
| 822 | drain_multiplex_messages(); |
| 823 | exit_cleanup(RERR_SOCKETIO); |
| 824 | } |
| 825 | } |
| 826 | if (msgs2stderr && DEBUG_GTE(IO, 2)) { |
| 827 | rprintf(FINFO, "[%s] %s sent=%ld\n", |
| 828 | who_am_i(), out == &iobuf.out ? "out" : "msg", (long)n); |
| 829 | } |
| 830 | |
| 831 | if (io_timeout) |
| 832 | last_io_out = time(NULL); |
| 833 | stats.total_written += n; |
| 834 | |
| 835 | if (bwlimit_writemax) |
| 836 | sleep_for_bwlimit(n); |
| 837 | |
| 838 | if ((out->pos += n) == out->size) { |
| 839 | if (iobuf.raw_flushing_ends_before) |
| 840 | iobuf.raw_flushing_ends_before -= out->size; |
| 841 | out->pos = 0; |
| 842 | restore_iobuf_size(out); |
| 843 | } else if (out->pos == iobuf.raw_flushing_ends_before) |
| 844 | iobuf.raw_flushing_ends_before = 0; |
| 845 | if ((out->len -= n) == empty_buf_len) { |
| 846 | out->pos = 0; |
| 847 | restore_iobuf_size(out); |
| 848 | if (empty_buf_len) |
| 849 | iobuf.raw_data_header_pos = 0; |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | /* We need to help prevent deadlock by doing what reading |
| 854 | * we can whenever we are here trying to write. */ |
| 855 | if (IN_MULTIPLEXED_AND_READY && !(flags & PIO_NEED_INPUT)) { |
| 856 | while (!iobuf.raw_input_ends_before && iobuf.in.len > 512) |
| 857 | read_a_msg(); |
| 858 | if (flist_receiving_enabled && iobuf.in.len > 512) |
| 859 | wait_for_receiver(); /* generator only */ |
| 860 | } |
| 861 | |
| 862 | if (ff_forward_fd >= 0 && FD_ISSET(ff_forward_fd, &r_fds)) { |
| 863 | /* This can potentially flush all output and enable |
| 864 | * multiplexed output, so keep this last in the loop |
| 865 | * and be sure to not cache anything that would break |
| 866 | * such a change. */ |
| 867 | forward_filesfrom_data(); |
| 868 | } |
| 869 | } |
| 870 | double_break: |
| 871 | |
| 872 | data = iobuf.in.buf + iobuf.in.pos; |
| 873 | |
| 874 | if (flags & PIO_CONSUME_INPUT) { |
| 875 | iobuf.in.len -= needed; |
| 876 | iobuf.in.pos += needed; |
| 877 | if (iobuf.in.pos == iobuf.raw_input_ends_before) |
| 878 | iobuf.raw_input_ends_before = 0; |
| 879 | if (iobuf.in.pos >= iobuf.in.size) { |
| 880 | iobuf.in.pos -= iobuf.in.size; |
| 881 | if (iobuf.raw_input_ends_before) |
| 882 | iobuf.raw_input_ends_before -= iobuf.in.size; |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | return data; |
| 887 | } |
| 888 | |
| 889 | static void raw_read_buf(char *buf, size_t len) |
| 890 | { |
| 891 | size_t pos = iobuf.in.pos; |
| 892 | char *data = perform_io(len, PIO_INPUT_AND_CONSUME); |
| 893 | if (iobuf.in.pos <= pos && len) { |
| 894 | size_t siz = len - iobuf.in.pos; |
| 895 | memcpy(buf, data, siz); |
| 896 | memcpy(buf + siz, iobuf.in.buf, iobuf.in.pos); |
| 897 | } else |
| 898 | memcpy(buf, data, len); |
| 899 | } |
| 900 | |
| 901 | static int32 raw_read_int(void) |
| 902 | { |
| 903 | char *data, buf[4]; |
| 904 | if (iobuf.in.size - iobuf.in.pos >= 4) |
| 905 | data = perform_io(4, PIO_INPUT_AND_CONSUME); |
| 906 | else |
| 907 | raw_read_buf(data = buf, 4); |
| 908 | return IVAL(data, 0); |
| 909 | } |
| 910 | |
| 911 | void noop_io_until_death(void) |
| 912 | { |
| 913 | char buf[1024]; |
| 914 | |
| 915 | kluge_around_eof = 2; |
| 916 | /* Setting an I/O timeout ensures that if something inexplicably weird |
| 917 | * happens, we won't hang around forever. */ |
| 918 | if (!io_timeout) |
| 919 | set_io_timeout(60); |
| 920 | |
| 921 | while (1) |
| 922 | read_buf(iobuf.in_fd, buf, sizeof buf); |
| 923 | } |
| 924 | |
| 925 | /* Buffer a message for the multiplexed output stream. Is not used for (normal) MSG_DATA. */ |
| 926 | int send_msg(enum msgcode code, const char *buf, size_t len, int convert) |
| 927 | { |
| 928 | char *hdr; |
| 929 | size_t needed, pos; |
| 930 | BOOL want_debug = DEBUG_GTE(IO, 1) && convert >= 0 && (msgs2stderr || code != MSG_INFO); |
| 931 | |
| 932 | if (!OUT_MULTIPLEXED) |
| 933 | return 0; |
| 934 | |
| 935 | if (want_debug) |
| 936 | rprintf(FINFO, "[%s] send_msg(%d, %ld)\n", who_am_i(), (int)code, (long)len); |
| 937 | |
| 938 | /* When checking for enough free space for this message, we need to |
| 939 | * make sure that there is space for the 4-byte header, plus we'll |
| 940 | * assume that we may waste up to 3 bytes (if the header doesn't fit |
| 941 | * at the physical end of the buffer). */ |
| 942 | #ifdef ICONV_OPTION |
| 943 | if (convert > 0 && ic_send == (iconv_t)-1) |
| 944 | convert = 0; |
| 945 | if (convert > 0) { |
| 946 | /* Ensuring double-size room leaves space for maximal conversion expansion. */ |
| 947 | needed = len*2 + 4 + 3; |
| 948 | } else |
| 949 | #endif |
| 950 | needed = len + 4 + 3; |
| 951 | if (iobuf.msg.len + needed > iobuf.msg.size) |
| 952 | perform_io(needed, PIO_NEED_MSGROOM); |
| 953 | |
| 954 | pos = iobuf.msg.pos + iobuf.msg.len; /* Must be set after any flushing. */ |
| 955 | if (pos >= iobuf.msg.size) |
| 956 | pos -= iobuf.msg.size; |
| 957 | else if (pos + 4 > iobuf.msg.size) { |
| 958 | /* The 4-byte header won't fit at the end of the buffer, |
| 959 | * so we'll temporarily reduce the message buffer's size |
| 960 | * and put the header at the start of the buffer. */ |
| 961 | reduce_iobuf_size(&iobuf.msg, pos); |
| 962 | pos = 0; |
| 963 | } |
| 964 | hdr = iobuf.msg.buf + pos; |
| 965 | |
| 966 | iobuf.msg.len += 4; /* Allocate room for the coming header bytes. */ |
| 967 | |
| 968 | #ifdef ICONV_OPTION |
| 969 | if (convert > 0) { |
| 970 | xbuf inbuf; |
| 971 | |
| 972 | INIT_XBUF(inbuf, (char*)buf, len, (size_t)-1); |
| 973 | |
| 974 | len = iobuf.msg.len; |
| 975 | iconvbufs(ic_send, &inbuf, &iobuf.msg, |
| 976 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_CIRCULAR_OUT | ICB_INIT); |
| 977 | if (inbuf.len > 0) { |
| 978 | rprintf(FERROR, "overflowed iobuf.msg buffer in send_msg"); |
| 979 | exit_cleanup(RERR_UNSUPPORTED); |
| 980 | } |
| 981 | len = iobuf.msg.len - len; |
| 982 | } else |
| 983 | #endif |
| 984 | { |
| 985 | size_t siz; |
| 986 | |
| 987 | if ((pos += 4) == iobuf.msg.size) |
| 988 | pos = 0; |
| 989 | |
| 990 | /* Handle a split copy if we wrap around the end of the circular buffer. */ |
| 991 | if (pos >= iobuf.msg.pos && (siz = iobuf.msg.size - pos) < len) { |
| 992 | memcpy(iobuf.msg.buf + pos, buf, siz); |
| 993 | memcpy(iobuf.msg.buf, buf + siz, len - siz); |
| 994 | } else |
| 995 | memcpy(iobuf.msg.buf + pos, buf, len); |
| 996 | |
| 997 | iobuf.msg.len += len; |
| 998 | } |
| 999 | |
| 1000 | SIVAL(hdr, 0, ((MPLEX_BASE + (int)code)<<24) + len); |
| 1001 | |
| 1002 | if (want_debug && convert > 0) |
| 1003 | rprintf(FINFO, "[%s] converted msg len=%ld\n", who_am_i(), (long)len); |
| 1004 | |
| 1005 | return 1; |
| 1006 | } |
| 1007 | |
| 1008 | void send_msg_int(enum msgcode code, int num) |
| 1009 | { |
| 1010 | char numbuf[4]; |
| 1011 | |
| 1012 | if (DEBUG_GTE(IO, 1)) |
| 1013 | rprintf(FINFO, "[%s] send_msg_int(%d, %d)\n", who_am_i(), (int)code, num); |
| 1014 | |
| 1015 | SIVAL(numbuf, 0, num); |
| 1016 | send_msg(code, numbuf, 4, -1); |
| 1017 | } |
| 1018 | |
| 1019 | static void got_flist_entry_status(enum festatus status, int ndx) |
| 1020 | { |
| 1021 | struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status"); |
| 1022 | |
| 1023 | if (remove_source_files) { |
| 1024 | active_filecnt--; |
| 1025 | active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]); |
| 1026 | } |
| 1027 | |
| 1028 | if (inc_recurse) |
| 1029 | flist->in_progress--; |
| 1030 | |
| 1031 | switch (status) { |
| 1032 | case FES_SUCCESS: |
| 1033 | if (remove_source_files) |
| 1034 | send_msg_int(MSG_SUCCESS, ndx); |
| 1035 | if (preserve_hard_links) { |
| 1036 | struct file_struct *file = flist->files[ndx - flist->ndx_start]; |
| 1037 | if (F_IS_HLINKED(file)) { |
| 1038 | flist_ndx_push(&hlink_list, ndx); |
| 1039 | flist->in_progress++; |
| 1040 | } |
| 1041 | } |
| 1042 | break; |
| 1043 | case FES_REDO: |
| 1044 | if (read_batch) { |
| 1045 | if (inc_recurse) |
| 1046 | flist->in_progress++; |
| 1047 | break; |
| 1048 | } |
| 1049 | if (inc_recurse) |
| 1050 | flist->to_redo++; |
| 1051 | flist_ndx_push(&redo_list, ndx); |
| 1052 | break; |
| 1053 | case FES_NO_SEND: |
| 1054 | break; |
| 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | /* Note the fds used for the main socket (which might really be a pipe |
| 1059 | * for a local transfer, but we can ignore that). */ |
| 1060 | void io_set_sock_fds(int f_in, int f_out) |
| 1061 | { |
| 1062 | sock_f_in = f_in; |
| 1063 | sock_f_out = f_out; |
| 1064 | } |
| 1065 | |
| 1066 | void set_io_timeout(int secs) |
| 1067 | { |
| 1068 | io_timeout = secs; |
| 1069 | allowed_lull = (io_timeout + 1) / 2; |
| 1070 | |
| 1071 | if (!io_timeout || allowed_lull > SELECT_TIMEOUT) |
| 1072 | select_timeout = SELECT_TIMEOUT; |
| 1073 | else |
| 1074 | select_timeout = allowed_lull; |
| 1075 | |
| 1076 | if (read_batch) |
| 1077 | allowed_lull = 0; |
| 1078 | } |
| 1079 | |
| 1080 | static void check_for_d_option_error(const char *msg) |
| 1081 | { |
| 1082 | static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz"; |
| 1083 | char *colon; |
| 1084 | int saw_d = 0; |
| 1085 | |
| 1086 | if (*msg != 'r' |
| 1087 | || strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0) |
| 1088 | return; |
| 1089 | |
| 1090 | msg += sizeof REMOTE_OPTION_ERROR - 1; |
| 1091 | if (*msg == '-' || (colon = strchr(msg, ':')) == NULL |
| 1092 | || strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0) |
| 1093 | return; |
| 1094 | |
| 1095 | for ( ; *msg != ':'; msg++) { |
| 1096 | if (*msg == 'd') |
| 1097 | saw_d = 1; |
| 1098 | else if (*msg == 'e') |
| 1099 | break; |
| 1100 | else if (strchr(rsync263_opts, *msg) == NULL) |
| 1101 | return; |
| 1102 | } |
| 1103 | |
| 1104 | if (saw_d) { |
| 1105 | rprintf(FWARNING, |
| 1106 | "*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n"); |
| 1107 | } |
| 1108 | } |
| 1109 | |
| 1110 | /* This is used by the generator to limit how many file transfers can |
| 1111 | * be active at once when --remove-source-files is specified. Without |
| 1112 | * this, sender-side deletions were mostly happening at the end. */ |
| 1113 | void increment_active_files(int ndx, int itemizing, enum logcode code) |
| 1114 | { |
| 1115 | while (1) { |
| 1116 | /* TODO: tune these limits? */ |
| 1117 | int limit = active_bytecnt >= 128*1024 ? 10 : 50; |
| 1118 | if (active_filecnt < limit) |
| 1119 | break; |
| 1120 | check_for_finished_files(itemizing, code, 0); |
| 1121 | if (active_filecnt < limit) |
| 1122 | break; |
| 1123 | wait_for_receiver(); |
| 1124 | } |
| 1125 | |
| 1126 | active_filecnt++; |
| 1127 | active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]); |
| 1128 | } |
| 1129 | |
| 1130 | int get_redo_num(void) |
| 1131 | { |
| 1132 | return flist_ndx_pop(&redo_list); |
| 1133 | } |
| 1134 | |
| 1135 | int get_hlink_num(void) |
| 1136 | { |
| 1137 | return flist_ndx_pop(&hlink_list); |
| 1138 | } |
| 1139 | |
| 1140 | /* When we're the receiver and we have a local --files-from list of names |
| 1141 | * that needs to be sent over the socket to the sender, we have to do two |
| 1142 | * things at the same time: send the sender a list of what files we're |
| 1143 | * processing and read the incoming file+info list from the sender. We do |
| 1144 | * this by making recv_file_list() call forward_filesfrom_data(), which |
| 1145 | * will ensure that we forward data to the sender until we get some data |
| 1146 | * for recv_file_list() to use. */ |
| 1147 | void start_filesfrom_forwarding(int fd) |
| 1148 | { |
| 1149 | if (protocol_version < 31 && OUT_MULTIPLEXED) { |
| 1150 | /* Older protocols send the files-from data w/o packaging |
| 1151 | * it in multiplexed I/O packets, so temporarily switch |
| 1152 | * to buffered I/O to match this behavior. */ |
| 1153 | iobuf.msg.pos = iobuf.msg.len = 0; /* Be extra sure no messages go out. */ |
| 1154 | ff_reenable_multiplex = io_end_multiplex_out(MPLX_TO_BUFFERED); |
| 1155 | } |
| 1156 | ff_forward_fd = fd; |
| 1157 | |
| 1158 | alloc_xbuf(&ff_xb, FILESFROM_BUFLEN); |
| 1159 | } |
| 1160 | |
| 1161 | /* Read a line into the "buf" buffer. */ |
| 1162 | int read_line(int fd, char *buf, size_t bufsiz, int flags) |
| 1163 | { |
| 1164 | char ch, *s, *eob; |
| 1165 | |
| 1166 | #ifdef ICONV_OPTION |
| 1167 | if (flags & RL_CONVERT && iconv_buf.size < bufsiz) |
| 1168 | realloc_xbuf(&iconv_buf, bufsiz + 1024); |
| 1169 | #endif |
| 1170 | |
| 1171 | start: |
| 1172 | #ifdef ICONV_OPTION |
| 1173 | s = flags & RL_CONVERT ? iconv_buf.buf : buf; |
| 1174 | #else |
| 1175 | s = buf; |
| 1176 | #endif |
| 1177 | eob = s + bufsiz - 1; |
| 1178 | while (1) { |
| 1179 | /* We avoid read_byte() for files because files can return an EOF. */ |
| 1180 | if (fd == iobuf.in_fd) |
| 1181 | ch = read_byte(fd); |
| 1182 | else if (safe_read(fd, &ch, 1) == 0) |
| 1183 | break; |
| 1184 | if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) { |
| 1185 | /* Skip empty lines if dumping comments. */ |
| 1186 | if (flags & RL_DUMP_COMMENTS && s == buf) |
| 1187 | continue; |
| 1188 | break; |
| 1189 | } |
| 1190 | if (s < eob) |
| 1191 | *s++ = ch; |
| 1192 | } |
| 1193 | *s = '\0'; |
| 1194 | |
| 1195 | if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';')) |
| 1196 | goto start; |
| 1197 | |
| 1198 | #ifdef ICONV_OPTION |
| 1199 | if (flags & RL_CONVERT) { |
| 1200 | xbuf outbuf; |
| 1201 | INIT_XBUF(outbuf, buf, 0, bufsiz); |
| 1202 | iconv_buf.pos = 0; |
| 1203 | iconv_buf.len = s - iconv_buf.buf; |
| 1204 | iconvbufs(ic_recv, &iconv_buf, &outbuf, |
| 1205 | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT); |
| 1206 | outbuf.buf[outbuf.len] = '\0'; |
| 1207 | return outbuf.len; |
| 1208 | } |
| 1209 | #endif |
| 1210 | |
| 1211 | return s - buf; |
| 1212 | } |
| 1213 | |
| 1214 | void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls, |
| 1215 | char ***argv_p, int *argc_p, char **request_p) |
| 1216 | { |
| 1217 | int maxargs = MAX_ARGS; |
| 1218 | int dot_pos = 0; |
| 1219 | int argc = 0; |
| 1220 | char **argv, *p; |
| 1221 | int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0); |
| 1222 | |
| 1223 | #ifdef ICONV_OPTION |
| 1224 | rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0); |
| 1225 | #endif |
| 1226 | |
| 1227 | if (!(argv = new_array(char *, maxargs))) |
| 1228 | out_of_memory("read_args"); |
| 1229 | if (mod_name && !protect_args) |
| 1230 | argv[argc++] = "rsyncd"; |
| 1231 | |
| 1232 | while (1) { |
| 1233 | if (read_line(f_in, buf, bufsiz, rl_flags) == 0) |
| 1234 | break; |
| 1235 | |
| 1236 | if (argc == maxargs-1) { |
| 1237 | maxargs += MAX_ARGS; |
| 1238 | if (!(argv = realloc_array(argv, char *, maxargs))) |
| 1239 | out_of_memory("read_args"); |
| 1240 | } |
| 1241 | |
| 1242 | if (dot_pos) { |
| 1243 | if (request_p) { |
| 1244 | *request_p = strdup(buf); |
| 1245 | request_p = NULL; |
| 1246 | } |
| 1247 | if (mod_name) |
| 1248 | glob_expand_module(mod_name, buf, &argv, &argc, &maxargs); |
| 1249 | else |
| 1250 | glob_expand(buf, &argv, &argc, &maxargs); |
| 1251 | } else { |
| 1252 | if (!(p = strdup(buf))) |
| 1253 | out_of_memory("read_args"); |
| 1254 | argv[argc++] = p; |
| 1255 | if (*p == '.' && p[1] == '\0') |
| 1256 | dot_pos = argc; |
| 1257 | } |
| 1258 | } |
| 1259 | argv[argc] = NULL; |
| 1260 | |
| 1261 | glob_expand(NULL, NULL, NULL, NULL); |
| 1262 | |
| 1263 | *argc_p = argc; |
| 1264 | *argv_p = argv; |
| 1265 | } |
| 1266 | |
| 1267 | BOOL io_start_buffering_out(int f_out) |
| 1268 | { |
| 1269 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 1270 | rprintf(FINFO, "[%s] io_start_buffering_out(%d)\n", who_am_i(), f_out); |
| 1271 | |
| 1272 | if (iobuf.out.buf) { |
| 1273 | if (iobuf.out_fd == -1) |
| 1274 | iobuf.out_fd = f_out; |
| 1275 | else |
| 1276 | assert(f_out == iobuf.out_fd); |
| 1277 | return False; |
| 1278 | } |
| 1279 | |
| 1280 | alloc_xbuf(&iobuf.out, ROUND_UP_1024(IO_BUFFER_SIZE * 2)); |
| 1281 | iobuf.out_fd = f_out; |
| 1282 | |
| 1283 | return True; |
| 1284 | } |
| 1285 | |
| 1286 | BOOL io_start_buffering_in(int f_in) |
| 1287 | { |
| 1288 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 1289 | rprintf(FINFO, "[%s] io_start_buffering_in(%d)\n", who_am_i(), f_in); |
| 1290 | |
| 1291 | if (iobuf.in.buf) { |
| 1292 | if (iobuf.in_fd == -1) |
| 1293 | iobuf.in_fd = f_in; |
| 1294 | else |
| 1295 | assert(f_in == iobuf.in_fd); |
| 1296 | return False; |
| 1297 | } |
| 1298 | |
| 1299 | alloc_xbuf(&iobuf.in, ROUND_UP_1024(IO_BUFFER_SIZE)); |
| 1300 | iobuf.in_fd = f_in; |
| 1301 | |
| 1302 | return True; |
| 1303 | } |
| 1304 | |
| 1305 | void io_end_buffering_in(BOOL free_buffers) |
| 1306 | { |
| 1307 | if (msgs2stderr && DEBUG_GTE(IO, 2)) { |
| 1308 | rprintf(FINFO, "[%s] io_end_buffering_in(IOBUF_%s_BUFS)\n", |
| 1309 | who_am_i(), free_buffers ? "FREE" : "KEEP"); |
| 1310 | } |
| 1311 | |
| 1312 | if (free_buffers) |
| 1313 | free_xbuf(&iobuf.in); |
| 1314 | else |
| 1315 | iobuf.in.pos = iobuf.in.len = 0; |
| 1316 | |
| 1317 | iobuf.in_fd = -1; |
| 1318 | } |
| 1319 | |
| 1320 | void io_end_buffering_out(BOOL free_buffers) |
| 1321 | { |
| 1322 | if (msgs2stderr && DEBUG_GTE(IO, 2)) { |
| 1323 | rprintf(FINFO, "[%s] io_end_buffering_out(IOBUF_%s_BUFS)\n", |
| 1324 | who_am_i(), free_buffers ? "FREE" : "KEEP"); |
| 1325 | } |
| 1326 | |
| 1327 | io_flush(FULL_FLUSH); |
| 1328 | |
| 1329 | if (free_buffers) { |
| 1330 | free_xbuf(&iobuf.out); |
| 1331 | free_xbuf(&iobuf.msg); |
| 1332 | } |
| 1333 | |
| 1334 | iobuf.out_fd = -1; |
| 1335 | } |
| 1336 | |
| 1337 | void maybe_flush_socket(int important) |
| 1338 | { |
| 1339 | if (flist_eof && iobuf.out.buf && iobuf.out.len > iobuf.out_empty_len |
| 1340 | && (important || time(NULL) - last_io_out >= 5)) |
| 1341 | io_flush(NORMAL_FLUSH); |
| 1342 | } |
| 1343 | |
| 1344 | /* Older rsync versions used to send either a MSG_NOOP (protocol 30) or a |
| 1345 | * raw-data-based keep-alive (protocol 29), both of which implied forwarding of |
| 1346 | * the message through the sender. Since the new timeout method does not need |
| 1347 | * any forwarding, we just send an empty MSG_DATA message, which works with all |
| 1348 | * rsync versions. This avoids any message forwarding, and leaves the raw-data |
| 1349 | * stream alone (since we can never be quite sure if that stream is in the |
| 1350 | * right state for a keep-alive message). */ |
| 1351 | void maybe_send_keepalive(time_t now, int flags) |
| 1352 | { |
| 1353 | if (flags & MSK_ACTIVE_RECEIVER) |
| 1354 | last_io_in = now; /* Fudge things when we're working hard on the files. */ |
| 1355 | |
| 1356 | if (now - last_io_out >= allowed_lull) { |
| 1357 | /* The receiver is special: it only sends keep-alive messages if it is |
| 1358 | * actively receiving data. Otherwise, it lets the generator timeout. */ |
| 1359 | if (am_receiver && now - last_io_in >= io_timeout) |
| 1360 | return; |
| 1361 | |
| 1362 | if (!iobuf.msg.len && iobuf.out.len == iobuf.out_empty_len) |
| 1363 | send_msg(MSG_DATA, "", 0, 0); |
| 1364 | if (!(flags & MSK_ALLOW_FLUSH)) { |
| 1365 | /* Let the caller worry about writing out the data. */ |
| 1366 | } else if (iobuf.msg.len) |
| 1367 | perform_io(iobuf.msg.size - iobuf.msg.len + 1, PIO_NEED_MSGROOM); |
| 1368 | else if (iobuf.out.len > iobuf.out_empty_len) |
| 1369 | io_flush(NORMAL_FLUSH); |
| 1370 | } |
| 1371 | } |
| 1372 | |
| 1373 | void start_flist_forward(int ndx) |
| 1374 | { |
| 1375 | write_int(iobuf.out_fd, ndx); |
| 1376 | forward_flist_data = 1; |
| 1377 | } |
| 1378 | |
| 1379 | void stop_flist_forward(void) |
| 1380 | { |
| 1381 | forward_flist_data = 0; |
| 1382 | } |
| 1383 | |
| 1384 | /* Read a message from a multiplexed source. */ |
| 1385 | static void read_a_msg(void) |
| 1386 | { |
| 1387 | char data[BIGPATHBUFLEN]; |
| 1388 | int tag, val; |
| 1389 | size_t msg_bytes; |
| 1390 | |
| 1391 | /* This ensures that perform_io() does not try to do any message reading |
| 1392 | * until we've read all of the data for this message. We should also |
| 1393 | * try to avoid calling things that will cause data to be written via |
| 1394 | * perform_io() prior to this being reset to 1. */ |
| 1395 | iobuf.in_multiplexed = -1; |
| 1396 | |
| 1397 | tag = raw_read_int(); |
| 1398 | |
| 1399 | msg_bytes = tag & 0xFFFFFF; |
| 1400 | tag = (tag >> 24) - MPLEX_BASE; |
| 1401 | |
| 1402 | if (DEBUG_GTE(IO, 1) && msgs2stderr) |
| 1403 | rprintf(FINFO, "[%s] got msg=%d, len=%ld\n", who_am_i(), (int)tag, (long)msg_bytes); |
| 1404 | |
| 1405 | switch (tag) { |
| 1406 | case MSG_DATA: |
| 1407 | assert(iobuf.raw_input_ends_before == 0); |
| 1408 | /* Though this does not yet read the data, we do mark where in |
| 1409 | * the buffer the msg data will end once it is read. It is |
| 1410 | * possible that this points off the end of the buffer, in |
| 1411 | * which case the gradual reading of the input stream will |
| 1412 | * cause this value to wrap around and eventually become real. */ |
| 1413 | if (msg_bytes) |
| 1414 | iobuf.raw_input_ends_before = iobuf.in.pos + msg_bytes; |
| 1415 | iobuf.in_multiplexed = 1; |
| 1416 | break; |
| 1417 | case MSG_STATS: |
| 1418 | if (msg_bytes != sizeof stats.total_read || !am_generator) |
| 1419 | goto invalid_msg; |
| 1420 | raw_read_buf((char*)&stats.total_read, sizeof stats.total_read); |
| 1421 | iobuf.in_multiplexed = 1; |
| 1422 | break; |
| 1423 | case MSG_REDO: |
| 1424 | if (msg_bytes != 4 || !am_generator) |
| 1425 | goto invalid_msg; |
| 1426 | val = raw_read_int(); |
| 1427 | iobuf.in_multiplexed = 1; |
| 1428 | got_flist_entry_status(FES_REDO, val); |
| 1429 | break; |
| 1430 | case MSG_IO_ERROR: |
| 1431 | if (msg_bytes != 4) |
| 1432 | goto invalid_msg; |
| 1433 | val = raw_read_int(); |
| 1434 | iobuf.in_multiplexed = 1; |
| 1435 | io_error |= val; |
| 1436 | if (am_receiver) |
| 1437 | send_msg_int(MSG_IO_ERROR, val); |
| 1438 | break; |
| 1439 | case MSG_IO_TIMEOUT: |
| 1440 | if (msg_bytes != 4 || am_server || am_generator) |
| 1441 | goto invalid_msg; |
| 1442 | val = raw_read_int(); |
| 1443 | iobuf.in_multiplexed = 1; |
| 1444 | if (!io_timeout || io_timeout > val) { |
| 1445 | if (INFO_GTE(MISC, 2)) |
| 1446 | rprintf(FINFO, "Setting --timeout=%d to match server\n", val); |
| 1447 | set_io_timeout(val); |
| 1448 | } |
| 1449 | break; |
| 1450 | case MSG_NOOP: |
| 1451 | /* Support protocol-30 keep-alive method. */ |
| 1452 | if (msg_bytes != 0) |
| 1453 | goto invalid_msg; |
| 1454 | iobuf.in_multiplexed = 1; |
| 1455 | if (am_sender) |
| 1456 | maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH); |
| 1457 | break; |
| 1458 | case MSG_DELETED: |
| 1459 | if (msg_bytes >= sizeof data) |
| 1460 | goto overflow; |
| 1461 | if (am_generator) { |
| 1462 | raw_read_buf(data, msg_bytes); |
| 1463 | iobuf.in_multiplexed = 1; |
| 1464 | send_msg(MSG_DELETED, data, msg_bytes, 1); |
| 1465 | break; |
| 1466 | } |
| 1467 | #ifdef ICONV_OPTION |
| 1468 | if (ic_recv != (iconv_t)-1) { |
| 1469 | xbuf outbuf, inbuf; |
| 1470 | char ibuf[512]; |
| 1471 | int add_null = 0; |
| 1472 | int flags = ICB_INCLUDE_BAD | ICB_INIT; |
| 1473 | |
| 1474 | INIT_CONST_XBUF(outbuf, data); |
| 1475 | INIT_XBUF(inbuf, ibuf, 0, (size_t)-1); |
| 1476 | |
| 1477 | while (msg_bytes) { |
| 1478 | size_t len = msg_bytes > sizeof ibuf - inbuf.len ? sizeof ibuf - inbuf.len : msg_bytes; |
| 1479 | raw_read_buf(ibuf + inbuf.len, len); |
| 1480 | inbuf.pos = 0; |
| 1481 | inbuf.len += len; |
| 1482 | if (!(msg_bytes -= len) && !ibuf[inbuf.len-1]) |
| 1483 | inbuf.len--, add_null = 1; |
| 1484 | if (iconvbufs(ic_send, &inbuf, &outbuf, flags) < 0) { |
| 1485 | if (errno == E2BIG) |
| 1486 | goto overflow; |
| 1487 | /* Buffer ended with an incomplete char, so move the |
| 1488 | * bytes to the start of the buffer and continue. */ |
| 1489 | memmove(ibuf, ibuf + inbuf.pos, inbuf.len); |
| 1490 | } |
| 1491 | flags &= ~ICB_INIT; |
| 1492 | } |
| 1493 | if (add_null) { |
| 1494 | if (outbuf.len == outbuf.size) |
| 1495 | goto overflow; |
| 1496 | outbuf.buf[outbuf.len++] = '\0'; |
| 1497 | } |
| 1498 | msg_bytes = outbuf.len; |
| 1499 | } else |
| 1500 | #endif |
| 1501 | raw_read_buf(data, msg_bytes); |
| 1502 | iobuf.in_multiplexed = 1; |
| 1503 | /* A directory name was sent with the trailing null */ |
| 1504 | if (msg_bytes > 0 && !data[msg_bytes-1]) |
| 1505 | log_delete(data, S_IFDIR); |
| 1506 | else { |
| 1507 | data[msg_bytes] = '\0'; |
| 1508 | log_delete(data, S_IFREG); |
| 1509 | } |
| 1510 | break; |
| 1511 | case MSG_SUCCESS: |
| 1512 | if (msg_bytes != 4) { |
| 1513 | invalid_msg: |
| 1514 | rprintf(FERROR, "invalid multi-message %d:%lu [%s%s]\n", |
| 1515 | tag, (unsigned long)msg_bytes, who_am_i(), |
| 1516 | inc_recurse ? "/inc" : ""); |
| 1517 | exit_cleanup(RERR_STREAMIO); |
| 1518 | } |
| 1519 | val = raw_read_int(); |
| 1520 | iobuf.in_multiplexed = 1; |
| 1521 | if (am_generator) |
| 1522 | got_flist_entry_status(FES_SUCCESS, val); |
| 1523 | else |
| 1524 | successful_send(val); |
| 1525 | break; |
| 1526 | case MSG_NO_SEND: |
| 1527 | if (msg_bytes != 4) |
| 1528 | goto invalid_msg; |
| 1529 | val = raw_read_int(); |
| 1530 | iobuf.in_multiplexed = 1; |
| 1531 | if (am_generator) |
| 1532 | got_flist_entry_status(FES_NO_SEND, val); |
| 1533 | else |
| 1534 | send_msg_int(MSG_NO_SEND, val); |
| 1535 | break; |
| 1536 | case MSG_ERROR_SOCKET: |
| 1537 | case MSG_ERROR_UTF8: |
| 1538 | case MSG_CLIENT: |
| 1539 | case MSG_LOG: |
| 1540 | if (!am_generator) |
| 1541 | goto invalid_msg; |
| 1542 | if (tag == MSG_ERROR_SOCKET) |
| 1543 | msgs2stderr = 1; |
| 1544 | /* FALL THROUGH */ |
| 1545 | case MSG_INFO: |
| 1546 | case MSG_ERROR: |
| 1547 | case MSG_ERROR_XFER: |
| 1548 | case MSG_WARNING: |
| 1549 | if (msg_bytes >= sizeof data) { |
| 1550 | overflow: |
| 1551 | rprintf(FERROR, |
| 1552 | "multiplexing overflow %d:%lu [%s%s]\n", |
| 1553 | tag, (unsigned long)msg_bytes, who_am_i(), |
| 1554 | inc_recurse ? "/inc" : ""); |
| 1555 | exit_cleanup(RERR_STREAMIO); |
| 1556 | } |
| 1557 | raw_read_buf(data, msg_bytes); |
| 1558 | iobuf.in_multiplexed = 1; |
| 1559 | rwrite((enum logcode)tag, data, msg_bytes, !am_generator); |
| 1560 | if (first_message) { |
| 1561 | if (list_only && !am_sender && tag == 1 && msg_bytes < sizeof data) { |
| 1562 | data[msg_bytes] = '\0'; |
| 1563 | check_for_d_option_error(data); |
| 1564 | } |
| 1565 | first_message = 0; |
| 1566 | } |
| 1567 | break; |
| 1568 | case MSG_ERROR_EXIT: |
| 1569 | if (msg_bytes == 4) |
| 1570 | val = raw_read_int(); |
| 1571 | else if (msg_bytes == 0) |
| 1572 | val = 0; |
| 1573 | else |
| 1574 | goto invalid_msg; |
| 1575 | iobuf.in_multiplexed = 1; |
| 1576 | if (DEBUG_GTE(EXIT, 3)) |
| 1577 | rprintf(FINFO, "[%s] got MSG_ERROR_EXIT with %ld bytes\n", who_am_i(), (long)msg_bytes); |
| 1578 | if (msg_bytes == 0) { |
| 1579 | if (!am_sender && !am_generator) { |
| 1580 | if (DEBUG_GTE(EXIT, 3)) { |
| 1581 | rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT (len 0)\n", |
| 1582 | who_am_i()); |
| 1583 | } |
| 1584 | send_msg(MSG_ERROR_EXIT, "", 0, 0); |
| 1585 | io_flush(FULL_FLUSH); |
| 1586 | } |
| 1587 | } else if (protocol_version >= 31) { |
| 1588 | if (am_generator) { |
| 1589 | if (DEBUG_GTE(EXIT, 3)) { |
| 1590 | rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT with exit_code %d\n", |
| 1591 | who_am_i(), val); |
| 1592 | } |
| 1593 | send_msg_int(MSG_ERROR_EXIT, val); |
| 1594 | } else { |
| 1595 | if (DEBUG_GTE(EXIT, 3)) { |
| 1596 | rprintf(FINFO, "[%s] sending MSG_ERROR_EXIT (len 0)\n", |
| 1597 | who_am_i()); |
| 1598 | } |
| 1599 | send_msg(MSG_ERROR_EXIT, "", 0, 0); |
| 1600 | } |
| 1601 | } |
| 1602 | /* Send a negative linenum so that we don't end up |
| 1603 | * with a duplicate exit message. */ |
| 1604 | _exit_cleanup(val, __FILE__, 0 - __LINE__); |
| 1605 | default: |
| 1606 | rprintf(FERROR, "unexpected tag %d [%s%s]\n", |
| 1607 | tag, who_am_i(), inc_recurse ? "/inc" : ""); |
| 1608 | exit_cleanup(RERR_STREAMIO); |
| 1609 | } |
| 1610 | |
| 1611 | assert(iobuf.in_multiplexed > 0); |
| 1612 | } |
| 1613 | |
| 1614 | static void drain_multiplex_messages(void) |
| 1615 | { |
| 1616 | while (IN_MULTIPLEXED_AND_READY && iobuf.in.len) { |
| 1617 | if (iobuf.raw_input_ends_before) { |
| 1618 | size_t raw_len = iobuf.raw_input_ends_before - iobuf.in.pos; |
| 1619 | iobuf.raw_input_ends_before = 0; |
| 1620 | if (raw_len >= iobuf.in.len) { |
| 1621 | iobuf.in.len = 0; |
| 1622 | break; |
| 1623 | } |
| 1624 | iobuf.in.len -= raw_len; |
| 1625 | if ((iobuf.in.pos += raw_len) >= iobuf.in.size) |
| 1626 | iobuf.in.pos -= iobuf.in.size; |
| 1627 | } |
| 1628 | read_a_msg(); |
| 1629 | } |
| 1630 | } |
| 1631 | |
| 1632 | void wait_for_receiver(void) |
| 1633 | { |
| 1634 | if (!iobuf.raw_input_ends_before) |
| 1635 | read_a_msg(); |
| 1636 | |
| 1637 | if (iobuf.raw_input_ends_before) { |
| 1638 | int ndx = read_int(iobuf.in_fd); |
| 1639 | if (ndx < 0) { |
| 1640 | switch (ndx) { |
| 1641 | case NDX_FLIST_EOF: |
| 1642 | flist_eof = 1; |
| 1643 | if (DEBUG_GTE(FLIST, 3)) |
| 1644 | rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i()); |
| 1645 | break; |
| 1646 | case NDX_DONE: |
| 1647 | msgdone_cnt++; |
| 1648 | break; |
| 1649 | default: |
| 1650 | exit_cleanup(RERR_STREAMIO); |
| 1651 | } |
| 1652 | } else { |
| 1653 | struct file_list *flist; |
| 1654 | flist_receiving_enabled = False; |
| 1655 | if (DEBUG_GTE(FLIST, 2)) { |
| 1656 | rprintf(FINFO, "[%s] receiving flist for dir %d\n", |
| 1657 | who_am_i(), ndx); |
| 1658 | } |
| 1659 | flist = recv_file_list(iobuf.in_fd); |
| 1660 | flist->parent_ndx = ndx; |
| 1661 | #ifdef SUPPORT_HARD_LINKS |
| 1662 | if (preserve_hard_links) |
| 1663 | match_hard_links(flist); |
| 1664 | #endif |
| 1665 | flist_receiving_enabled = True; |
| 1666 | } |
| 1667 | } |
| 1668 | } |
| 1669 | |
| 1670 | unsigned short read_shortint(int f) |
| 1671 | { |
| 1672 | char b[2]; |
| 1673 | read_buf(f, b, 2); |
| 1674 | return (UVAL(b, 1) << 8) + UVAL(b, 0); |
| 1675 | } |
| 1676 | |
| 1677 | int32 read_int(int f) |
| 1678 | { |
| 1679 | char b[4]; |
| 1680 | int32 num; |
| 1681 | |
| 1682 | read_buf(f, b, 4); |
| 1683 | num = IVAL(b, 0); |
| 1684 | #if SIZEOF_INT32 > 4 |
| 1685 | if (num & (int32)0x80000000) |
| 1686 | num |= ~(int32)0xffffffff; |
| 1687 | #endif |
| 1688 | return num; |
| 1689 | } |
| 1690 | |
| 1691 | int32 read_varint(int f) |
| 1692 | { |
| 1693 | union { |
| 1694 | char b[5]; |
| 1695 | int32 x; |
| 1696 | } u; |
| 1697 | uchar ch; |
| 1698 | int extra; |
| 1699 | |
| 1700 | u.x = 0; |
| 1701 | ch = read_byte(f); |
| 1702 | extra = int_byte_extra[ch / 4]; |
| 1703 | if (extra) { |
| 1704 | uchar bit = ((uchar)1<<(8-extra)); |
| 1705 | if (extra >= (int)sizeof u.b) { |
| 1706 | rprintf(FERROR, "Overflow in read_varint()\n"); |
| 1707 | exit_cleanup(RERR_STREAMIO); |
| 1708 | } |
| 1709 | read_buf(f, u.b, extra); |
| 1710 | u.b[extra] = ch & (bit-1); |
| 1711 | } else |
| 1712 | u.b[0] = ch; |
| 1713 | #if CAREFUL_ALIGNMENT |
| 1714 | u.x = IVAL(u.b,0); |
| 1715 | #endif |
| 1716 | #if SIZEOF_INT32 > 4 |
| 1717 | if (u.x & (int32)0x80000000) |
| 1718 | u.x |= ~(int32)0xffffffff; |
| 1719 | #endif |
| 1720 | return u.x; |
| 1721 | } |
| 1722 | |
| 1723 | int64 read_varlong(int f, uchar min_bytes) |
| 1724 | { |
| 1725 | union { |
| 1726 | char b[9]; |
| 1727 | int64 x; |
| 1728 | } u; |
| 1729 | char b2[8]; |
| 1730 | int extra; |
| 1731 | |
| 1732 | #if SIZEOF_INT64 < 8 |
| 1733 | memset(u.b, 0, 8); |
| 1734 | #else |
| 1735 | u.x = 0; |
| 1736 | #endif |
| 1737 | read_buf(f, b2, min_bytes); |
| 1738 | memcpy(u.b, b2+1, min_bytes-1); |
| 1739 | extra = int_byte_extra[CVAL(b2, 0) / 4]; |
| 1740 | if (extra) { |
| 1741 | uchar bit = ((uchar)1<<(8-extra)); |
| 1742 | if (min_bytes + extra > (int)sizeof u.b) { |
| 1743 | rprintf(FERROR, "Overflow in read_varlong()\n"); |
| 1744 | exit_cleanup(RERR_STREAMIO); |
| 1745 | } |
| 1746 | read_buf(f, u.b + min_bytes - 1, extra); |
| 1747 | u.b[min_bytes + extra - 1] = CVAL(b2, 0) & (bit-1); |
| 1748 | #if SIZEOF_INT64 < 8 |
| 1749 | if (min_bytes + extra > 5 || u.b[4] || CVAL(u.b,3) & 0x80) { |
| 1750 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
| 1751 | exit_cleanup(RERR_UNSUPPORTED); |
| 1752 | } |
| 1753 | #endif |
| 1754 | } else |
| 1755 | u.b[min_bytes + extra - 1] = CVAL(b2, 0); |
| 1756 | #if SIZEOF_INT64 < 8 |
| 1757 | u.x = IVAL(u.b,0); |
| 1758 | #elif CAREFUL_ALIGNMENT |
| 1759 | u.x = IVAL(u.b,0) | (((int64)IVAL(u.b,4))<<32); |
| 1760 | #endif |
| 1761 | return u.x; |
| 1762 | } |
| 1763 | |
| 1764 | int64 read_longint(int f) |
| 1765 | { |
| 1766 | #if SIZEOF_INT64 >= 8 |
| 1767 | char b[9]; |
| 1768 | #endif |
| 1769 | int32 num = read_int(f); |
| 1770 | |
| 1771 | if (num != (int32)0xffffffff) |
| 1772 | return num; |
| 1773 | |
| 1774 | #if SIZEOF_INT64 < 8 |
| 1775 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
| 1776 | exit_cleanup(RERR_UNSUPPORTED); |
| 1777 | #else |
| 1778 | read_buf(f, b, 8); |
| 1779 | return IVAL(b,0) | (((int64)IVAL(b,4))<<32); |
| 1780 | #endif |
| 1781 | } |
| 1782 | |
| 1783 | void read_buf(int f, char *buf, size_t len) |
| 1784 | { |
| 1785 | if (f != iobuf.in_fd) { |
| 1786 | if (safe_read(f, buf, len) != len) |
| 1787 | whine_about_eof(False); /* Doesn't return. */ |
| 1788 | goto batch_copy; |
| 1789 | } |
| 1790 | |
| 1791 | if (!IN_MULTIPLEXED) { |
| 1792 | raw_read_buf(buf, len); |
| 1793 | total_data_read += len; |
| 1794 | if (forward_flist_data) |
| 1795 | write_buf(iobuf.out_fd, buf, len); |
| 1796 | batch_copy: |
| 1797 | if (f == write_batch_monitor_in) |
| 1798 | safe_write(batch_fd, buf, len); |
| 1799 | return; |
| 1800 | } |
| 1801 | |
| 1802 | while (1) { |
| 1803 | size_t siz; |
| 1804 | |
| 1805 | while (!iobuf.raw_input_ends_before) |
| 1806 | read_a_msg(); |
| 1807 | |
| 1808 | siz = MIN(len, iobuf.raw_input_ends_before - iobuf.in.pos); |
| 1809 | if (siz >= iobuf.in.size) |
| 1810 | siz = iobuf.in.size; |
| 1811 | raw_read_buf(buf, siz); |
| 1812 | total_data_read += siz; |
| 1813 | |
| 1814 | if (forward_flist_data) |
| 1815 | write_buf(iobuf.out_fd, buf, siz); |
| 1816 | |
| 1817 | if (f == write_batch_monitor_in) |
| 1818 | safe_write(batch_fd, buf, siz); |
| 1819 | |
| 1820 | if ((len -= siz) == 0) |
| 1821 | break; |
| 1822 | buf += siz; |
| 1823 | } |
| 1824 | } |
| 1825 | |
| 1826 | void read_sbuf(int f, char *buf, size_t len) |
| 1827 | { |
| 1828 | read_buf(f, buf, len); |
| 1829 | buf[len] = '\0'; |
| 1830 | } |
| 1831 | |
| 1832 | uchar read_byte(int f) |
| 1833 | { |
| 1834 | uchar c; |
| 1835 | read_buf(f, (char*)&c, 1); |
| 1836 | return c; |
| 1837 | } |
| 1838 | |
| 1839 | int read_vstring(int f, char *buf, int bufsize) |
| 1840 | { |
| 1841 | int len = read_byte(f); |
| 1842 | |
| 1843 | if (len & 0x80) |
| 1844 | len = (len & ~0x80) * 0x100 + read_byte(f); |
| 1845 | |
| 1846 | if (len >= bufsize) { |
| 1847 | rprintf(FERROR, "over-long vstring received (%d > %d)\n", |
| 1848 | len, bufsize - 1); |
| 1849 | return -1; |
| 1850 | } |
| 1851 | |
| 1852 | if (len) |
| 1853 | read_buf(f, buf, len); |
| 1854 | buf[len] = '\0'; |
| 1855 | return len; |
| 1856 | } |
| 1857 | |
| 1858 | /* Populate a sum_struct with values from the socket. This is |
| 1859 | * called by both the sender and the receiver. */ |
| 1860 | void read_sum_head(int f, struct sum_struct *sum) |
| 1861 | { |
| 1862 | int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE; |
| 1863 | sum->count = read_int(f); |
| 1864 | if (sum->count < 0) { |
| 1865 | rprintf(FERROR, "Invalid checksum count %ld [%s]\n", |
| 1866 | (long)sum->count, who_am_i()); |
| 1867 | exit_cleanup(RERR_PROTOCOL); |
| 1868 | } |
| 1869 | sum->blength = read_int(f); |
| 1870 | if (sum->blength < 0 || sum->blength > max_blength) { |
| 1871 | rprintf(FERROR, "Invalid block length %ld [%s]\n", |
| 1872 | (long)sum->blength, who_am_i()); |
| 1873 | exit_cleanup(RERR_PROTOCOL); |
| 1874 | } |
| 1875 | sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); |
| 1876 | if (sum->s2length < 0 || sum->s2length > MAX_DIGEST_LEN) { |
| 1877 | rprintf(FERROR, "Invalid checksum length %d [%s]\n", |
| 1878 | sum->s2length, who_am_i()); |
| 1879 | exit_cleanup(RERR_PROTOCOL); |
| 1880 | } |
| 1881 | sum->remainder = read_int(f); |
| 1882 | if (sum->remainder < 0 || sum->remainder > sum->blength) { |
| 1883 | rprintf(FERROR, "Invalid remainder length %ld [%s]\n", |
| 1884 | (long)sum->remainder, who_am_i()); |
| 1885 | exit_cleanup(RERR_PROTOCOL); |
| 1886 | } |
| 1887 | } |
| 1888 | |
| 1889 | /* Send the values from a sum_struct over the socket. Set sum to |
| 1890 | * NULL if there are no checksums to send. This is called by both |
| 1891 | * the generator and the sender. */ |
| 1892 | void write_sum_head(int f, struct sum_struct *sum) |
| 1893 | { |
| 1894 | static struct sum_struct null_sum; |
| 1895 | |
| 1896 | if (sum == NULL) |
| 1897 | sum = &null_sum; |
| 1898 | |
| 1899 | write_int(f, sum->count); |
| 1900 | write_int(f, sum->blength); |
| 1901 | if (protocol_version >= 27) |
| 1902 | write_int(f, sum->s2length); |
| 1903 | write_int(f, sum->remainder); |
| 1904 | } |
| 1905 | |
| 1906 | /* Sleep after writing to limit I/O bandwidth usage. |
| 1907 | * |
| 1908 | * @todo Rather than sleeping after each write, it might be better to |
| 1909 | * use some kind of averaging. The current algorithm seems to always |
| 1910 | * use a bit less bandwidth than specified, because it doesn't make up |
| 1911 | * for slow periods. But arguably this is a feature. In addition, we |
| 1912 | * ought to take the time used to write the data into account. |
| 1913 | * |
| 1914 | * During some phases of big transfers (file FOO is uptodate) this is |
| 1915 | * called with a small bytes_written every time. As the kernel has to |
| 1916 | * round small waits up to guarantee that we actually wait at least the |
| 1917 | * requested number of microseconds, this can become grossly inaccurate. |
| 1918 | * We therefore keep track of the bytes we've written over time and only |
| 1919 | * sleep when the accumulated delay is at least 1 tenth of a second. */ |
| 1920 | static void sleep_for_bwlimit(int bytes_written) |
| 1921 | { |
| 1922 | static struct timeval prior_tv; |
| 1923 | static long total_written = 0; |
| 1924 | struct timeval tv, start_tv; |
| 1925 | long elapsed_usec, sleep_usec; |
| 1926 | |
| 1927 | #define ONE_SEC 1000000L /* # of microseconds in a second */ |
| 1928 | |
| 1929 | total_written += bytes_written; |
| 1930 | |
| 1931 | gettimeofday(&start_tv, NULL); |
| 1932 | if (prior_tv.tv_sec) { |
| 1933 | elapsed_usec = (start_tv.tv_sec - prior_tv.tv_sec) * ONE_SEC |
| 1934 | + (start_tv.tv_usec - prior_tv.tv_usec); |
| 1935 | total_written -= elapsed_usec * bwlimit / (ONE_SEC/1024); |
| 1936 | if (total_written < 0) |
| 1937 | total_written = 0; |
| 1938 | } |
| 1939 | |
| 1940 | sleep_usec = total_written * (ONE_SEC/1024) / bwlimit; |
| 1941 | if (sleep_usec < ONE_SEC / 10) { |
| 1942 | prior_tv = start_tv; |
| 1943 | return; |
| 1944 | } |
| 1945 | |
| 1946 | tv.tv_sec = sleep_usec / ONE_SEC; |
| 1947 | tv.tv_usec = sleep_usec % ONE_SEC; |
| 1948 | select(0, NULL, NULL, NULL, &tv); |
| 1949 | |
| 1950 | gettimeofday(&prior_tv, NULL); |
| 1951 | elapsed_usec = (prior_tv.tv_sec - start_tv.tv_sec) * ONE_SEC |
| 1952 | + (prior_tv.tv_usec - start_tv.tv_usec); |
| 1953 | total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); |
| 1954 | } |
| 1955 | |
| 1956 | void io_flush(int flush_it_all) |
| 1957 | { |
| 1958 | if (iobuf.out.len > iobuf.out_empty_len) { |
| 1959 | if (flush_it_all) /* FULL_FLUSH: flush everything in the output buffers */ |
| 1960 | perform_io(iobuf.out.size - iobuf.out_empty_len, PIO_NEED_OUTROOM); |
| 1961 | else /* NORMAL_FLUSH: flush at least 1 byte */ |
| 1962 | perform_io(iobuf.out.size - iobuf.out.len + 1, PIO_NEED_OUTROOM); |
| 1963 | } |
| 1964 | if (iobuf.msg.len) |
| 1965 | perform_io(iobuf.msg.size, PIO_NEED_MSGROOM); |
| 1966 | } |
| 1967 | |
| 1968 | void write_shortint(int f, unsigned short x) |
| 1969 | { |
| 1970 | char b[2]; |
| 1971 | b[0] = (char)x; |
| 1972 | b[1] = (char)(x >> 8); |
| 1973 | write_buf(f, b, 2); |
| 1974 | } |
| 1975 | |
| 1976 | void write_int(int f, int32 x) |
| 1977 | { |
| 1978 | char b[4]; |
| 1979 | SIVAL(b, 0, x); |
| 1980 | write_buf(f, b, 4); |
| 1981 | } |
| 1982 | |
| 1983 | void write_varint(int f, int32 x) |
| 1984 | { |
| 1985 | char b[5]; |
| 1986 | uchar bit; |
| 1987 | int cnt = 4; |
| 1988 | |
| 1989 | SIVAL(b, 1, x); |
| 1990 | |
| 1991 | while (cnt > 1 && b[cnt] == 0) |
| 1992 | cnt--; |
| 1993 | bit = ((uchar)1<<(7-cnt+1)); |
| 1994 | if (CVAL(b, cnt) >= bit) { |
| 1995 | cnt++; |
| 1996 | *b = ~(bit-1); |
| 1997 | } else if (cnt > 1) |
| 1998 | *b = b[cnt] | ~(bit*2-1); |
| 1999 | else |
| 2000 | *b = b[cnt]; |
| 2001 | |
| 2002 | write_buf(f, b, cnt); |
| 2003 | } |
| 2004 | |
| 2005 | void write_varlong(int f, int64 x, uchar min_bytes) |
| 2006 | { |
| 2007 | char b[9]; |
| 2008 | uchar bit; |
| 2009 | int cnt = 8; |
| 2010 | |
| 2011 | SIVAL(b, 1, x); |
| 2012 | #if SIZEOF_INT64 >= 8 |
| 2013 | SIVAL(b, 5, x >> 32); |
| 2014 | #else |
| 2015 | if (x <= 0x7FFFFFFF && x >= 0) |
| 2016 | memset(b + 5, 0, 4); |
| 2017 | else { |
| 2018 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
| 2019 | exit_cleanup(RERR_UNSUPPORTED); |
| 2020 | } |
| 2021 | #endif |
| 2022 | |
| 2023 | while (cnt > min_bytes && b[cnt] == 0) |
| 2024 | cnt--; |
| 2025 | bit = ((uchar)1<<(7-cnt+min_bytes)); |
| 2026 | if (CVAL(b, cnt) >= bit) { |
| 2027 | cnt++; |
| 2028 | *b = ~(bit-1); |
| 2029 | } else if (cnt > min_bytes) |
| 2030 | *b = b[cnt] | ~(bit*2-1); |
| 2031 | else |
| 2032 | *b = b[cnt]; |
| 2033 | |
| 2034 | write_buf(f, b, cnt); |
| 2035 | } |
| 2036 | |
| 2037 | /* |
| 2038 | * Note: int64 may actually be a 32-bit type if ./configure couldn't find any |
| 2039 | * 64-bit types on this platform. |
| 2040 | */ |
| 2041 | void write_longint(int f, int64 x) |
| 2042 | { |
| 2043 | char b[12], * const s = b+4; |
| 2044 | |
| 2045 | SIVAL(s, 0, x); |
| 2046 | if (x <= 0x7FFFFFFF && x >= 0) { |
| 2047 | write_buf(f, s, 4); |
| 2048 | return; |
| 2049 | } |
| 2050 | |
| 2051 | #if SIZEOF_INT64 < 8 |
| 2052 | rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); |
| 2053 | exit_cleanup(RERR_UNSUPPORTED); |
| 2054 | #else |
| 2055 | memset(b, 0xFF, 4); |
| 2056 | SIVAL(s, 4, x >> 32); |
| 2057 | write_buf(f, b, 12); |
| 2058 | #endif |
| 2059 | } |
| 2060 | |
| 2061 | void write_buf(int f, const char *buf, size_t len) |
| 2062 | { |
| 2063 | size_t pos, siz; |
| 2064 | |
| 2065 | if (f != iobuf.out_fd) { |
| 2066 | safe_write(f, buf, len); |
| 2067 | goto batch_copy; |
| 2068 | } |
| 2069 | |
| 2070 | if (iobuf.out.len + len > iobuf.out.size) |
| 2071 | perform_io(len, PIO_NEED_OUTROOM); |
| 2072 | |
| 2073 | pos = iobuf.out.pos + iobuf.out.len; /* Must be set after any flushing. */ |
| 2074 | if (pos >= iobuf.out.size) |
| 2075 | pos -= iobuf.out.size; |
| 2076 | |
| 2077 | /* Handle a split copy if we wrap around the end of the circular buffer. */ |
| 2078 | if (pos >= iobuf.out.pos && (siz = iobuf.out.size - pos) < len) { |
| 2079 | memcpy(iobuf.out.buf + pos, buf, siz); |
| 2080 | memcpy(iobuf.out.buf, buf + siz, len - siz); |
| 2081 | } else |
| 2082 | memcpy(iobuf.out.buf + pos, buf, len); |
| 2083 | |
| 2084 | iobuf.out.len += len; |
| 2085 | total_data_written += len; |
| 2086 | |
| 2087 | batch_copy: |
| 2088 | if (f == write_batch_monitor_out) |
| 2089 | safe_write(batch_fd, buf, len); |
| 2090 | } |
| 2091 | |
| 2092 | /* Write a string to the connection */ |
| 2093 | void write_sbuf(int f, const char *buf) |
| 2094 | { |
| 2095 | write_buf(f, buf, strlen(buf)); |
| 2096 | } |
| 2097 | |
| 2098 | void write_byte(int f, uchar c) |
| 2099 | { |
| 2100 | write_buf(f, (char *)&c, 1); |
| 2101 | } |
| 2102 | |
| 2103 | void write_vstring(int f, const char *str, int len) |
| 2104 | { |
| 2105 | uchar lenbuf[3], *lb = lenbuf; |
| 2106 | |
| 2107 | if (len > 0x7F) { |
| 2108 | if (len > 0x7FFF) { |
| 2109 | rprintf(FERROR, |
| 2110 | "attempting to send over-long vstring (%d > %d)\n", |
| 2111 | len, 0x7FFF); |
| 2112 | exit_cleanup(RERR_PROTOCOL); |
| 2113 | } |
| 2114 | *lb++ = len / 0x100 + 0x80; |
| 2115 | } |
| 2116 | *lb = len; |
| 2117 | |
| 2118 | write_buf(f, (char*)lenbuf, lb - lenbuf + 1); |
| 2119 | if (len) |
| 2120 | write_buf(f, str, len); |
| 2121 | } |
| 2122 | |
| 2123 | /* Send a file-list index using a byte-reduction method. */ |
| 2124 | void write_ndx(int f, int32 ndx) |
| 2125 | { |
| 2126 | static int32 prev_positive = -1, prev_negative = 1; |
| 2127 | int32 diff, cnt = 0; |
| 2128 | char b[6]; |
| 2129 | |
| 2130 | if (protocol_version < 30 || read_batch) { |
| 2131 | write_int(f, ndx); |
| 2132 | return; |
| 2133 | } |
| 2134 | |
| 2135 | /* Send NDX_DONE as a single-byte 0 with no side effects. Send |
| 2136 | * negative nums as a positive after sending a leading 0xFF. */ |
| 2137 | if (ndx >= 0) { |
| 2138 | diff = ndx - prev_positive; |
| 2139 | prev_positive = ndx; |
| 2140 | } else if (ndx == NDX_DONE) { |
| 2141 | *b = 0; |
| 2142 | write_buf(f, b, 1); |
| 2143 | return; |
| 2144 | } else { |
| 2145 | b[cnt++] = (char)0xFF; |
| 2146 | ndx = -ndx; |
| 2147 | diff = ndx - prev_negative; |
| 2148 | prev_negative = ndx; |
| 2149 | } |
| 2150 | |
| 2151 | /* A diff of 1 - 253 is sent as a one-byte diff; a diff of 254 - 32767 |
| 2152 | * or 0 is sent as a 0xFE + a two-byte diff; otherwise we send 0xFE |
| 2153 | * & all 4 bytes of the (non-negative) num with the high-bit set. */ |
| 2154 | if (diff < 0xFE && diff > 0) |
| 2155 | b[cnt++] = (char)diff; |
| 2156 | else if (diff < 0 || diff > 0x7FFF) { |
| 2157 | b[cnt++] = (char)0xFE; |
| 2158 | b[cnt++] = (char)((ndx >> 24) | 0x80); |
| 2159 | b[cnt++] = (char)ndx; |
| 2160 | b[cnt++] = (char)(ndx >> 8); |
| 2161 | b[cnt++] = (char)(ndx >> 16); |
| 2162 | } else { |
| 2163 | b[cnt++] = (char)0xFE; |
| 2164 | b[cnt++] = (char)(diff >> 8); |
| 2165 | b[cnt++] = (char)diff; |
| 2166 | } |
| 2167 | write_buf(f, b, cnt); |
| 2168 | } |
| 2169 | |
| 2170 | /* Receive a file-list index using a byte-reduction method. */ |
| 2171 | int32 read_ndx(int f) |
| 2172 | { |
| 2173 | static int32 prev_positive = -1, prev_negative = 1; |
| 2174 | int32 *prev_ptr, num; |
| 2175 | char b[4]; |
| 2176 | |
| 2177 | if (protocol_version < 30) |
| 2178 | return read_int(f); |
| 2179 | |
| 2180 | read_buf(f, b, 1); |
| 2181 | if (CVAL(b, 0) == 0xFF) { |
| 2182 | read_buf(f, b, 1); |
| 2183 | prev_ptr = &prev_negative; |
| 2184 | } else if (CVAL(b, 0) == 0) |
| 2185 | return NDX_DONE; |
| 2186 | else |
| 2187 | prev_ptr = &prev_positive; |
| 2188 | if (CVAL(b, 0) == 0xFE) { |
| 2189 | read_buf(f, b, 2); |
| 2190 | if (CVAL(b, 0) & 0x80) { |
| 2191 | b[3] = CVAL(b, 0) & ~0x80; |
| 2192 | b[0] = b[1]; |
| 2193 | read_buf(f, b+1, 2); |
| 2194 | num = IVAL(b, 0); |
| 2195 | } else |
| 2196 | num = (UVAL(b,0)<<8) + UVAL(b,1) + *prev_ptr; |
| 2197 | } else |
| 2198 | num = UVAL(b, 0) + *prev_ptr; |
| 2199 | *prev_ptr = num; |
| 2200 | if (prev_ptr == &prev_negative) |
| 2201 | num = -num; |
| 2202 | return num; |
| 2203 | } |
| 2204 | |
| 2205 | /* Read a line of up to bufsiz-1 characters into buf. Strips |
| 2206 | * the (required) trailing newline and all carriage returns. |
| 2207 | * Returns 1 for success; 0 for I/O error or truncation. */ |
| 2208 | int read_line_old(int fd, char *buf, size_t bufsiz) |
| 2209 | { |
| 2210 | bufsiz--; /* leave room for the null */ |
| 2211 | while (bufsiz > 0) { |
| 2212 | assert(fd != iobuf.in_fd); |
| 2213 | if (safe_read(fd, buf, 1) == 0) |
| 2214 | return 0; |
| 2215 | if (*buf == '\0') |
| 2216 | return 0; |
| 2217 | if (*buf == '\n') |
| 2218 | break; |
| 2219 | if (*buf != '\r') { |
| 2220 | buf++; |
| 2221 | bufsiz--; |
| 2222 | } |
| 2223 | } |
| 2224 | *buf = '\0'; |
| 2225 | return bufsiz > 0; |
| 2226 | } |
| 2227 | |
| 2228 | void io_printf(int fd, const char *format, ...) |
| 2229 | { |
| 2230 | va_list ap; |
| 2231 | char buf[BIGPATHBUFLEN]; |
| 2232 | int len; |
| 2233 | |
| 2234 | va_start(ap, format); |
| 2235 | len = vsnprintf(buf, sizeof buf, format, ap); |
| 2236 | va_end(ap); |
| 2237 | |
| 2238 | if (len < 0) |
| 2239 | exit_cleanup(RERR_PROTOCOL); |
| 2240 | |
| 2241 | if (len > (int)sizeof buf) { |
| 2242 | rprintf(FERROR, "io_printf() was too long for the buffer.\n"); |
| 2243 | exit_cleanup(RERR_PROTOCOL); |
| 2244 | } |
| 2245 | |
| 2246 | write_sbuf(fd, buf); |
| 2247 | } |
| 2248 | |
| 2249 | /* Setup for multiplexing a MSG_* stream with the data stream. */ |
| 2250 | void io_start_multiplex_out(int fd) |
| 2251 | { |
| 2252 | io_flush(FULL_FLUSH); |
| 2253 | |
| 2254 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 2255 | rprintf(FINFO, "[%s] io_start_multiplex_out(%d)\n", who_am_i(), fd); |
| 2256 | |
| 2257 | if (!iobuf.msg.buf) |
| 2258 | alloc_xbuf(&iobuf.msg, ROUND_UP_1024(IO_BUFFER_SIZE)); |
| 2259 | |
| 2260 | iobuf.out_empty_len = 4; /* See also OUT_MULTIPLEXED */ |
| 2261 | io_start_buffering_out(fd); |
| 2262 | |
| 2263 | iobuf.raw_data_header_pos = iobuf.out.pos + iobuf.out.len; |
| 2264 | iobuf.out.len += 4; |
| 2265 | } |
| 2266 | |
| 2267 | /* Setup for multiplexing a MSG_* stream with the data stream. */ |
| 2268 | void io_start_multiplex_in(int fd) |
| 2269 | { |
| 2270 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 2271 | rprintf(FINFO, "[%s] io_start_multiplex_in(%d)\n", who_am_i(), fd); |
| 2272 | |
| 2273 | iobuf.in_multiplexed = 1; /* See also IN_MULTIPLEXED */ |
| 2274 | io_start_buffering_in(fd); |
| 2275 | } |
| 2276 | |
| 2277 | int io_end_multiplex_in(int mode) |
| 2278 | { |
| 2279 | int ret = iobuf.in_multiplexed ? iobuf.in_fd : -1; |
| 2280 | |
| 2281 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 2282 | rprintf(FINFO, "[%s] io_end_multiplex_in(mode=%d)\n", who_am_i(), mode); |
| 2283 | |
| 2284 | iobuf.in_multiplexed = 0; |
| 2285 | if (mode == MPLX_SWITCHING) |
| 2286 | iobuf.raw_input_ends_before = 0; |
| 2287 | else |
| 2288 | assert(iobuf.raw_input_ends_before == 0); |
| 2289 | if (mode != MPLX_TO_BUFFERED) |
| 2290 | io_end_buffering_in(mode); |
| 2291 | |
| 2292 | return ret; |
| 2293 | } |
| 2294 | |
| 2295 | int io_end_multiplex_out(int mode) |
| 2296 | { |
| 2297 | int ret = iobuf.out_empty_len ? iobuf.out_fd : -1; |
| 2298 | |
| 2299 | if (msgs2stderr && DEBUG_GTE(IO, 2)) |
| 2300 | rprintf(FINFO, "[%s] io_end_multiplex_out(mode=%d)\n", who_am_i(), mode); |
| 2301 | |
| 2302 | if (mode != MPLX_TO_BUFFERED) |
| 2303 | io_end_buffering_out(mode); |
| 2304 | else |
| 2305 | io_flush(FULL_FLUSH); |
| 2306 | |
| 2307 | iobuf.out.len = 0; |
| 2308 | iobuf.out_empty_len = 0; |
| 2309 | |
| 2310 | return ret; |
| 2311 | } |
| 2312 | |
| 2313 | void start_write_batch(int fd) |
| 2314 | { |
| 2315 | /* Some communication has already taken place, but we don't |
| 2316 | * enable batch writing until here so that we can write a |
| 2317 | * canonical record of the communication even though the |
| 2318 | * actual communication so far depends on whether a daemon |
| 2319 | * is involved. */ |
| 2320 | write_int(batch_fd, protocol_version); |
| 2321 | if (protocol_version >= 30) |
| 2322 | write_byte(batch_fd, compat_flags); |
| 2323 | write_int(batch_fd, checksum_seed); |
| 2324 | |
| 2325 | if (am_sender) |
| 2326 | write_batch_monitor_out = fd; |
| 2327 | else |
| 2328 | write_batch_monitor_in = fd; |
| 2329 | } |
| 2330 | |
| 2331 | void stop_write_batch(void) |
| 2332 | { |
| 2333 | write_batch_monitor_out = -1; |
| 2334 | write_batch_monitor_in = -1; |
| 2335 | } |