| 1 | /* |
| 2 | Copyright (C) Andrew Tridgell 1996 |
| 3 | Copyright (C) Paul Mackerras 1996 |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | Utilities used in rsync |
| 22 | |
| 23 | tridge, June 1996 |
| 24 | */ |
| 25 | #include "rsync.h" |
| 26 | |
| 27 | static int64 total_written; |
| 28 | static int64 total_read; |
| 29 | |
| 30 | extern int verbose; |
| 31 | extern int sparse_files; |
| 32 | extern int io_timeout; |
| 33 | |
| 34 | int64 write_total(void) |
| 35 | { |
| 36 | return total_written; |
| 37 | } |
| 38 | |
| 39 | int64 read_total(void) |
| 40 | { |
| 41 | return total_read; |
| 42 | } |
| 43 | |
| 44 | static int buffer_f_in = -1; |
| 45 | |
| 46 | void setup_nonblocking(int f_in,int f_out) |
| 47 | { |
| 48 | set_blocking(f_out,0); |
| 49 | buffer_f_in = f_in; |
| 50 | } |
| 51 | |
| 52 | |
| 53 | static char *read_buffer; |
| 54 | static char *read_buffer_p; |
| 55 | static int read_buffer_len; |
| 56 | static int read_buffer_size; |
| 57 | |
| 58 | |
| 59 | /* This function was added to overcome a deadlock problem when using |
| 60 | * ssh. It looks like we can't allow our receive queue to get full or |
| 61 | * ssh will clag up. Uggh. */ |
| 62 | static void read_check(int f) |
| 63 | { |
| 64 | int n; |
| 65 | |
| 66 | if (f == -1) return; |
| 67 | |
| 68 | if (read_buffer_len == 0) { |
| 69 | read_buffer_p = read_buffer; |
| 70 | } |
| 71 | |
| 72 | if ((n=num_waiting(f)) <= 0) |
| 73 | return; |
| 74 | |
| 75 | /* things could deteriorate if we read in really small chunks */ |
| 76 | if (n < 10) n = 1024; |
| 77 | |
| 78 | if (read_buffer_p != read_buffer) { |
| 79 | memmove(read_buffer,read_buffer_p,read_buffer_len); |
| 80 | read_buffer_p = read_buffer; |
| 81 | } |
| 82 | |
| 83 | if (n > (read_buffer_size - read_buffer_len)) { |
| 84 | read_buffer_size += n; |
| 85 | if (!read_buffer) |
| 86 | read_buffer = (char *)malloc(read_buffer_size); |
| 87 | else |
| 88 | read_buffer = (char *)realloc(read_buffer,read_buffer_size); |
| 89 | if (!read_buffer) out_of_memory("read check"); |
| 90 | read_buffer_p = read_buffer; |
| 91 | } |
| 92 | |
| 93 | n = read(f,read_buffer+read_buffer_len,n); |
| 94 | if (n > 0) { |
| 95 | read_buffer_len += n; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static time_t last_io; |
| 100 | |
| 101 | |
| 102 | static void check_timeout(void) |
| 103 | { |
| 104 | time_t t; |
| 105 | |
| 106 | if (!io_timeout) return; |
| 107 | |
| 108 | if (!last_io) { |
| 109 | last_io = time(NULL); |
| 110 | return; |
| 111 | } |
| 112 | |
| 113 | t = time(NULL); |
| 114 | |
| 115 | if (last_io && io_timeout && (t-last_io)>io_timeout) { |
| 116 | rprintf(FERROR,"read timeout after %d second - exiting\n", |
| 117 | (int)(t-last_io)); |
| 118 | exit_cleanup(1); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static int readfd(int fd,char *buffer,int N) |
| 123 | { |
| 124 | int ret; |
| 125 | int total=0; |
| 126 | struct timeval tv; |
| 127 | |
| 128 | if (read_buffer_len < N) |
| 129 | read_check(buffer_f_in); |
| 130 | |
| 131 | while (total < N) { |
| 132 | if (read_buffer_len > 0 && buffer_f_in == fd) { |
| 133 | ret = MIN(read_buffer_len,N-total); |
| 134 | memcpy(buffer+total,read_buffer_p,ret); |
| 135 | read_buffer_p += ret; |
| 136 | read_buffer_len -= ret; |
| 137 | total += ret; |
| 138 | continue; |
| 139 | } |
| 140 | |
| 141 | while ((ret = read(fd,buffer + total,N-total)) == -1) { |
| 142 | fd_set fds; |
| 143 | |
| 144 | if (errno != EAGAIN && errno != EWOULDBLOCK) |
| 145 | return -1; |
| 146 | FD_ZERO(&fds); |
| 147 | FD_SET(fd, &fds); |
| 148 | tv.tv_sec = io_timeout; |
| 149 | tv.tv_usec = 0; |
| 150 | |
| 151 | if (select(fd+1, &fds, NULL, NULL, |
| 152 | io_timeout?&tv:NULL) != 1) { |
| 153 | check_timeout(); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | if (ret <= 0) |
| 158 | return total; |
| 159 | total += ret; |
| 160 | } |
| 161 | |
| 162 | if (io_timeout) |
| 163 | last_io = time(NULL); |
| 164 | return total; |
| 165 | } |
| 166 | |
| 167 | |
| 168 | int32 read_int(int f) |
| 169 | { |
| 170 | int ret; |
| 171 | char b[4]; |
| 172 | if ((ret=readfd(f,b,4)) != 4) { |
| 173 | if (verbose > 1) |
| 174 | rprintf(FERROR,"(%d) Error reading %d bytes : %s\n", |
| 175 | getpid(),4,ret==-1?strerror(errno):"EOF"); |
| 176 | exit_cleanup(1); |
| 177 | } |
| 178 | total_read += 4; |
| 179 | return IVAL(b,0); |
| 180 | } |
| 181 | |
| 182 | int64 read_longint(int f) |
| 183 | { |
| 184 | extern int remote_version; |
| 185 | int64 ret; |
| 186 | char b[8]; |
| 187 | ret = read_int(f); |
| 188 | |
| 189 | if ((int32)ret != (int32)0xffffffff) return ret; |
| 190 | |
| 191 | #ifdef NO_INT64 |
| 192 | rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n"); |
| 193 | exit_cleanup(1); |
| 194 | #else |
| 195 | if (remote_version >= 16) { |
| 196 | if ((ret=readfd(f,b,8)) != 8) { |
| 197 | if (verbose > 1) |
| 198 | rprintf(FERROR,"(%d) Error reading %d bytes : %s\n", |
| 199 | getpid(),8,ret==-1?strerror(errno):"EOF"); |
| 200 | exit_cleanup(1); |
| 201 | } |
| 202 | total_read += 8; |
| 203 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); |
| 204 | } |
| 205 | #endif |
| 206 | |
| 207 | return ret; |
| 208 | } |
| 209 | |
| 210 | void read_buf(int f,char *buf,int len) |
| 211 | { |
| 212 | int ret; |
| 213 | if ((ret=readfd(f,buf,len)) != len) { |
| 214 | if (verbose > 1) |
| 215 | rprintf(FERROR,"(%d) Error reading %d bytes : %s\n", |
| 216 | getpid(),len,ret==-1?strerror(errno):"EOF"); |
| 217 | exit_cleanup(1); |
| 218 | } |
| 219 | total_read += len; |
| 220 | } |
| 221 | |
| 222 | void read_sbuf(int f,char *buf,int len) |
| 223 | { |
| 224 | read_buf(f,buf,len); |
| 225 | buf[len] = 0; |
| 226 | } |
| 227 | |
| 228 | unsigned char read_byte(int f) |
| 229 | { |
| 230 | unsigned char c; |
| 231 | read_buf(f,(char *)&c,1); |
| 232 | return c; |
| 233 | } |
| 234 | |
| 235 | |
| 236 | static char last_byte; |
| 237 | static int last_sparse; |
| 238 | |
| 239 | int sparse_end(int f) |
| 240 | { |
| 241 | if (last_sparse) { |
| 242 | do_lseek(f,-1,SEEK_CUR); |
| 243 | return (write(f,&last_byte,1) == 1 ? 0 : -1); |
| 244 | } |
| 245 | last_sparse = 0; |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | static int write_sparse(int f,char *buf,int len) |
| 251 | { |
| 252 | int l1=0,l2=0; |
| 253 | int ret; |
| 254 | |
| 255 | for (l1=0;l1<len && buf[l1]==0;l1++) ; |
| 256 | for (l2=0;l2<(len-l1) && buf[len-(l2+1)]==0;l2++) ; |
| 257 | |
| 258 | last_byte = buf[len-1]; |
| 259 | |
| 260 | if (l1 == len || l2 > 0) |
| 261 | last_sparse=1; |
| 262 | |
| 263 | if (l1 > 0) |
| 264 | do_lseek(f,l1,SEEK_CUR); |
| 265 | |
| 266 | if (l1 == len) |
| 267 | return len; |
| 268 | |
| 269 | if ((ret=write(f,buf+l1,len-(l1+l2))) != len-(l1+l2)) { |
| 270 | if (ret == -1 || ret == 0) return ret; |
| 271 | return (l1+ret); |
| 272 | } |
| 273 | |
| 274 | if (l2 > 0) |
| 275 | do_lseek(f,l2,SEEK_CUR); |
| 276 | |
| 277 | return len; |
| 278 | } |
| 279 | |
| 280 | |
| 281 | |
| 282 | int write_file(int f,char *buf,int len) |
| 283 | { |
| 284 | int ret = 0; |
| 285 | |
| 286 | if (!sparse_files) |
| 287 | return write(f,buf,len); |
| 288 | |
| 289 | while (len>0) { |
| 290 | int len1 = MIN(len, SPARSE_WRITE_SIZE); |
| 291 | int r1 = write_sparse(f, buf, len1); |
| 292 | if (r1 <= 0) { |
| 293 | if (ret > 0) return ret; |
| 294 | return r1; |
| 295 | } |
| 296 | len -= r1; |
| 297 | buf += r1; |
| 298 | ret += r1; |
| 299 | } |
| 300 | return ret; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | static int writefd_unbuffered(int fd,char *buf,int len) |
| 305 | { |
| 306 | int total = 0; |
| 307 | fd_set w_fds, r_fds; |
| 308 | int fd_count, count, got_select=0; |
| 309 | struct timeval tv; |
| 310 | |
| 311 | if (buffer_f_in == -1) |
| 312 | return write(fd,buf,len); |
| 313 | |
| 314 | while (total < len) { |
| 315 | int ret = write(fd,buf+total,len-total); |
| 316 | |
| 317 | if (ret == 0) return total; |
| 318 | |
| 319 | if (ret == -1 && !(errno == EWOULDBLOCK || errno == EAGAIN)) |
| 320 | return -1; |
| 321 | |
| 322 | if (ret == -1 && got_select) { |
| 323 | /* hmmm, we got a write select on the fd and then failed to write. |
| 324 | Why doesn't that mean that the fd is dead? It doesn't on some |
| 325 | systems it seems (eg. IRIX) */ |
| 326 | u_sleep(1000); |
| 327 | #if 0 |
| 328 | rprintf(FERROR,"write exception\n"); |
| 329 | exit_cleanup(1); |
| 330 | #endif |
| 331 | } |
| 332 | |
| 333 | got_select = 0; |
| 334 | |
| 335 | |
| 336 | if (ret == -1) { |
| 337 | read_check(buffer_f_in); |
| 338 | |
| 339 | fd_count = fd+1; |
| 340 | FD_ZERO(&w_fds); |
| 341 | FD_ZERO(&r_fds); |
| 342 | FD_SET(fd,&w_fds); |
| 343 | if (buffer_f_in != -1) { |
| 344 | FD_SET(buffer_f_in,&r_fds); |
| 345 | if (buffer_f_in > fd) |
| 346 | fd_count = buffer_f_in+1; |
| 347 | } |
| 348 | |
| 349 | tv.tv_sec = BLOCKING_TIMEOUT; |
| 350 | tv.tv_usec = 0; |
| 351 | count = select(fd_count,buffer_f_in == -1? NULL: &r_fds, |
| 352 | &w_fds,NULL,&tv); |
| 353 | if (count == -1 && errno != EINTR) { |
| 354 | if (verbose > 1) |
| 355 | rprintf(FERROR,"select error: %s\n", strerror(errno)); |
| 356 | exit_cleanup(1); |
| 357 | } |
| 358 | |
| 359 | if (count == 0) { |
| 360 | check_timeout(); |
| 361 | continue; |
| 362 | } |
| 363 | |
| 364 | if (FD_ISSET(fd, &w_fds)) { |
| 365 | got_select = 1; |
| 366 | } |
| 367 | } else { |
| 368 | total += ret; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | if (io_timeout) |
| 373 | last_io = time(NULL); |
| 374 | |
| 375 | return total; |
| 376 | } |
| 377 | |
| 378 | static char *io_buffer; |
| 379 | static int io_buffer_count; |
| 380 | |
| 381 | void io_start_buffering(int fd) |
| 382 | { |
| 383 | io_buffer = (char *)malloc(IO_BUFFER_SIZE); |
| 384 | if (!io_buffer) out_of_memory("writefd"); |
| 385 | io_buffer_count = 0; |
| 386 | } |
| 387 | |
| 388 | void io_end_buffering(int fd) |
| 389 | { |
| 390 | if (io_buffer_count) { |
| 391 | if (writefd_unbuffered(fd, io_buffer, |
| 392 | io_buffer_count) != |
| 393 | io_buffer_count) { |
| 394 | rprintf(FERROR,"write failed\n"); |
| 395 | exit_cleanup(1); |
| 396 | } |
| 397 | io_buffer_count = 0; |
| 398 | } |
| 399 | free(io_buffer); |
| 400 | io_buffer = NULL; |
| 401 | } |
| 402 | |
| 403 | static int writefd(int fd,char *buf,int len1) |
| 404 | { |
| 405 | int len = len1; |
| 406 | |
| 407 | if (!io_buffer) return writefd_unbuffered(fd, buf, len); |
| 408 | |
| 409 | while (len) { |
| 410 | int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count); |
| 411 | if (n > 0) { |
| 412 | memcpy(io_buffer+io_buffer_count, buf, n); |
| 413 | buf += n; |
| 414 | len -= n; |
| 415 | io_buffer_count += n; |
| 416 | } |
| 417 | |
| 418 | if (io_buffer_count == IO_BUFFER_SIZE) { |
| 419 | if (writefd_unbuffered(fd, io_buffer, |
| 420 | io_buffer_count) != |
| 421 | io_buffer_count) { |
| 422 | return -1; |
| 423 | } |
| 424 | io_buffer_count = 0; |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | return len1; |
| 429 | } |
| 430 | |
| 431 | |
| 432 | void write_int(int f,int32 x) |
| 433 | { |
| 434 | int ret; |
| 435 | char b[4]; |
| 436 | SIVAL(b,0,x); |
| 437 | if ((ret=writefd(f,b,4)) != 4) { |
| 438 | rprintf(FERROR,"write_int failed : %s\n", |
| 439 | ret==-1?strerror(errno):"EOF"); |
| 440 | exit_cleanup(1); |
| 441 | } |
| 442 | total_written += 4; |
| 443 | } |
| 444 | |
| 445 | void write_longint(int f, int64 x) |
| 446 | { |
| 447 | extern int remote_version; |
| 448 | char b[8]; |
| 449 | int ret; |
| 450 | |
| 451 | if (remote_version < 16 || x <= 0x7FFFFFFF) { |
| 452 | write_int(f, (int)x); |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | write_int(f, -1); |
| 457 | SIVAL(b,0,(x&0xFFFFFFFF)); |
| 458 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); |
| 459 | |
| 460 | if ((ret=writefd(f,b,8)) != 8) { |
| 461 | rprintf(FERROR,"write_longint failed : %s\n", |
| 462 | ret==-1?strerror(errno):"EOF"); |
| 463 | exit_cleanup(1); |
| 464 | } |
| 465 | total_written += 8; |
| 466 | } |
| 467 | |
| 468 | void write_buf(int f,char *buf,int len) |
| 469 | { |
| 470 | int ret; |
| 471 | if ((ret=writefd(f,buf,len)) != len) { |
| 472 | rprintf(FERROR,"write_buf failed : %s\n", |
| 473 | ret==-1?strerror(errno):"EOF"); |
| 474 | exit_cleanup(1); |
| 475 | } |
| 476 | total_written += len; |
| 477 | } |
| 478 | |
| 479 | /* write a string to the connection */ |
| 480 | void write_sbuf(int f,char *buf) |
| 481 | { |
| 482 | write_buf(f, buf, strlen(buf)); |
| 483 | } |
| 484 | |
| 485 | |
| 486 | void write_byte(int f,unsigned char c) |
| 487 | { |
| 488 | write_buf(f,(char *)&c,1); |
| 489 | } |
| 490 | |
| 491 | void write_flush(int f) |
| 492 | { |
| 493 | } |
| 494 | |
| 495 | |
| 496 | int read_line(int f, char *buf, int maxlen) |
| 497 | { |
| 498 | while (maxlen) { |
| 499 | read_buf(f, buf, 1); |
| 500 | if (buf[0] == '\n') { |
| 501 | buf[0] = 0; |
| 502 | break; |
| 503 | } |
| 504 | if (buf[0] != '\r') { |
| 505 | buf++; |
| 506 | maxlen--; |
| 507 | } |
| 508 | } |
| 509 | if (maxlen == 0) { |
| 510 | *buf = 0; |
| 511 | return 0; |
| 512 | } |
| 513 | return 1; |
| 514 | } |
| 515 | |
| 516 | |
| 517 | void io_printf(int fd, const char *format, ...) |
| 518 | { |
| 519 | va_list ap; |
| 520 | char buf[1024]; |
| 521 | int len; |
| 522 | |
| 523 | va_start(ap, format); |
| 524 | len = vslprintf(buf, sizeof(buf)-1, format, ap); |
| 525 | va_end(ap); |
| 526 | |
| 527 | if (len < 0) exit_cleanup(1); |
| 528 | |
| 529 | write_sbuf(fd, buf); |
| 530 | } |