Commit | Line | Data |
---|---|---|
720b47f2 AT |
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 | ||
8cd9fd4e AT |
27 | /* if no timeout is specified then use a 60 second select timeout */ |
28 | #define SELECT_TIMEOUT 60 | |
29 | ||
8d9dc9f9 AT |
30 | static int io_multiplexing_out; |
31 | static int io_multiplexing_in; | |
679e7657 AT |
32 | static int multiplex_in_fd; |
33 | static int multiplex_out_fd; | |
8d9dc9f9 | 34 | static time_t last_io; |
528bfcd7 | 35 | static int eof_error=1; |
720b47f2 | 36 | extern int verbose; |
6ba9279f | 37 | extern int io_timeout; |
a800434a | 38 | extern struct stats stats; |
720b47f2 AT |
39 | |
40 | static int buffer_f_in = -1; | |
41 | ||
4c36ddbe | 42 | void setup_readbuffer(int f_in) |
720b47f2 | 43 | { |
22d6234e | 44 | buffer_f_in = f_in; |
720b47f2 AT |
45 | } |
46 | ||
8d9dc9f9 AT |
47 | static void check_timeout(void) |
48 | { | |
49 | time_t t; | |
50 | ||
51 | if (!io_timeout) return; | |
52 | ||
53 | if (!last_io) { | |
54 | last_io = time(NULL); | |
55 | return; | |
56 | } | |
57 | ||
58 | t = time(NULL); | |
59 | ||
86ffe37f AT |
60 | if (last_io && io_timeout && (t-last_io) >= io_timeout) { |
61 | rprintf(FERROR,"io timeout after %d second - exiting\n", | |
8d9dc9f9 AT |
62 | (int)(t-last_io)); |
63 | exit_cleanup(1); | |
64 | } | |
65 | } | |
66 | ||
720b47f2 | 67 | |
3a6a366f AT |
68 | static char *read_buffer; |
69 | static char *read_buffer_p; | |
70 | static int read_buffer_len; | |
71 | static int read_buffer_size; | |
e44f9a12 | 72 | static int no_flush; |
720b47f2 | 73 | |
4c36ddbe AT |
74 | /* read from a socket with IO timeout. return the number of |
75 | bytes read. If no bytes can be read then exit, never return | |
76 | a number <= 0 */ | |
77 | static int read_timeout(int fd, char *buf, int len) | |
8d9dc9f9 | 78 | { |
4c36ddbe AT |
79 | int n, ret=0; |
80 | ||
ea2111d1 AT |
81 | io_flush(); |
82 | ||
4c36ddbe AT |
83 | while (ret == 0) { |
84 | fd_set fds; | |
85 | struct timeval tv; | |
86 | ||
87 | FD_ZERO(&fds); | |
88 | FD_SET(fd, &fds); | |
8cd9fd4e | 89 | tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT; |
4c36ddbe AT |
90 | tv.tv_usec = 0; |
91 | ||
8cd9fd4e | 92 | if (select(fd+1, &fds, NULL, NULL, &tv) != 1) { |
4c36ddbe AT |
93 | check_timeout(); |
94 | continue; | |
95 | } | |
96 | ||
97 | n = read(fd, buf, len); | |
98 | ||
8d9dc9f9 | 99 | if (n > 0) { |
a800434a | 100 | stats.total_read += n; |
8d9dc9f9 AT |
101 | buf += n; |
102 | len -= n; | |
4c36ddbe AT |
103 | ret += n; |
104 | if (io_timeout) | |
105 | last_io = time(NULL); | |
106 | continue; | |
8d9dc9f9 | 107 | } |
4c36ddbe AT |
108 | |
109 | if (n == -1 && errno == EINTR) { | |
110 | continue; | |
111 | } | |
112 | ||
f7b93778 AT |
113 | if (n == -1 && |
114 | (errno == EAGAIN || errno == EWOULDBLOCK)) { | |
115 | /* this shouldn't happen, if it does then | |
116 | sleep for a short time to prevent us | |
117 | chewing too much CPU */ | |
118 | u_sleep(100); | |
119 | continue; | |
120 | } | |
121 | ||
8d9dc9f9 | 122 | if (n == 0) { |
528bfcd7 | 123 | if (eof_error) { |
ca8e9694 | 124 | rprintf(FERROR,"unexpected EOF in read_timeout\n"); |
528bfcd7 | 125 | } |
8d9dc9f9 AT |
126 | exit_cleanup(1); |
127 | } | |
8d9dc9f9 | 128 | |
4c36ddbe AT |
129 | rprintf(FERROR,"read error: %s\n", strerror(errno)); |
130 | exit_cleanup(1); | |
131 | } | |
8d9dc9f9 | 132 | |
4c36ddbe AT |
133 | return ret; |
134 | } | |
8d9dc9f9 | 135 | |
4c36ddbe AT |
136 | /* continue trying to read len bytes - don't return until len |
137 | has been read */ | |
138 | static void read_loop(int fd, char *buf, int len) | |
139 | { | |
140 | while (len) { | |
141 | int n = read_timeout(fd, buf, len); | |
142 | ||
143 | buf += n; | |
144 | len -= n; | |
8d9dc9f9 AT |
145 | } |
146 | } | |
147 | ||
cad2bba7 | 148 | /* read from the file descriptor handling multiplexing - |
4c36ddbe AT |
149 | return number of bytes read |
150 | never return <= 0 */ | |
8d9dc9f9 AT |
151 | static int read_unbuffered(int fd, char *buf, int len) |
152 | { | |
153 | static int remaining; | |
154 | char ibuf[4]; | |
155 | int tag, ret=0; | |
156 | char line[1024]; | |
157 | ||
679e7657 | 158 | if (!io_multiplexing_in || fd != multiplex_in_fd) |
4c36ddbe | 159 | return read_timeout(fd, buf, len); |
8d9dc9f9 AT |
160 | |
161 | while (ret == 0) { | |
162 | if (remaining) { | |
163 | len = MIN(len, remaining); | |
164 | read_loop(fd, buf, len); | |
165 | remaining -= len; | |
166 | ret = len; | |
167 | continue; | |
168 | } | |
169 | ||
170 | read_loop(fd, ibuf, 4); | |
171 | tag = IVAL(ibuf, 0); | |
679e7657 | 172 | |
8d9dc9f9 AT |
173 | remaining = tag & 0xFFFFFF; |
174 | tag = tag >> 24; | |
175 | ||
176 | if (tag == MPLEX_BASE) continue; | |
177 | ||
178 | tag -= MPLEX_BASE; | |
179 | ||
180 | if (tag != FERROR && tag != FINFO) { | |
181 | rprintf(FERROR,"unexpected tag %d\n", tag); | |
182 | exit_cleanup(1); | |
183 | } | |
184 | ||
185 | if (remaining > sizeof(line)-1) { | |
186 | rprintf(FERROR,"multiplexing overflow %d\n\n", | |
187 | remaining); | |
188 | exit_cleanup(1); | |
189 | } | |
190 | ||
191 | read_loop(fd, line, remaining); | |
192 | line[remaining] = 0; | |
193 | ||
194 | rprintf(tag,"%s", line); | |
195 | remaining = 0; | |
196 | } | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
201 | ||
4c36ddbe | 202 | |
720b47f2 AT |
203 | /* This function was added to overcome a deadlock problem when using |
204 | * ssh. It looks like we can't allow our receive queue to get full or | |
205 | * ssh will clag up. Uggh. */ | |
206 | static void read_check(int f) | |
207 | { | |
4c36ddbe | 208 | int n = 8192; |
720b47f2 | 209 | |
5dd7e031 | 210 | if (f == -1) return; |
05c629f7 | 211 | |
5dd7e031 AT |
212 | if (read_buffer_len == 0) { |
213 | read_buffer_p = read_buffer; | |
214 | } | |
720b47f2 | 215 | |
5dd7e031 AT |
216 | if (n > MAX_READ_BUFFER/4) |
217 | n = MAX_READ_BUFFER/4; | |
720b47f2 | 218 | |
5dd7e031 AT |
219 | if (read_buffer_p != read_buffer) { |
220 | memmove(read_buffer,read_buffer_p,read_buffer_len); | |
221 | read_buffer_p = read_buffer; | |
222 | } | |
720b47f2 | 223 | |
5dd7e031 AT |
224 | if (n > (read_buffer_size - read_buffer_len)) { |
225 | read_buffer_size += n; | |
fe8c0a98 | 226 | read_buffer = (char *)Realloc(read_buffer,read_buffer_size); |
5dd7e031 AT |
227 | if (!read_buffer) out_of_memory("read check"); |
228 | read_buffer_p = read_buffer; | |
229 | } | |
230 | ||
8d9dc9f9 | 231 | n = read_unbuffered(f,read_buffer+read_buffer_len,n); |
4c36ddbe | 232 | read_buffer_len += n; |
720b47f2 AT |
233 | } |
234 | ||
4c36ddbe AT |
235 | |
236 | /* do a buffered read from fd. don't return until all N bytes | |
237 | have been read. If all N can't be read then exit with an error */ | |
238 | static void readfd(int fd,char *buffer,int N) | |
720b47f2 | 239 | { |
6ba9279f AT |
240 | int ret; |
241 | int total=0; | |
6ba9279f | 242 | |
eb601ffe | 243 | if ((read_buffer_len < N) && (N < 1024)) { |
6ba9279f | 244 | read_check(buffer_f_in); |
4c36ddbe | 245 | } |
6ba9279f AT |
246 | |
247 | while (total < N) { | |
248 | if (read_buffer_len > 0 && buffer_f_in == fd) { | |
249 | ret = MIN(read_buffer_len,N-total); | |
250 | memcpy(buffer+total,read_buffer_p,ret); | |
251 | read_buffer_p += ret; | |
252 | read_buffer_len -= ret; | |
a070c37b | 253 | total += ret; |
6ba9279f AT |
254 | continue; |
255 | } | |
256 | ||
8d9dc9f9 AT |
257 | io_flush(); |
258 | ||
4c36ddbe | 259 | ret = read_unbuffered(fd,buffer + total,N-total); |
6ba9279f | 260 | total += ret; |
7f28dbee | 261 | } |
720b47f2 AT |
262 | } |
263 | ||
264 | ||
b7922338 | 265 | int32 read_int(int f) |
720b47f2 | 266 | { |
4c36ddbe AT |
267 | char b[4]; |
268 | readfd(f,b,4); | |
4c36ddbe | 269 | return IVAL(b,0); |
720b47f2 AT |
270 | } |
271 | ||
71c46176 | 272 | int64 read_longint(int f) |
3a6a366f AT |
273 | { |
274 | extern int remote_version; | |
71c46176 | 275 | int64 ret; |
3a6a366f AT |
276 | char b[8]; |
277 | ret = read_int(f); | |
71c46176 | 278 | |
b7922338 | 279 | if ((int32)ret != (int32)0xffffffff) return ret; |
71c46176 | 280 | |
3bee6733 | 281 | #ifdef NO_INT64 |
9486289c | 282 | rprintf(FERROR,"Integer overflow - attempted 64 bit offset\n"); |
71c46176 AT |
283 | exit_cleanup(1); |
284 | #else | |
285 | if (remote_version >= 16) { | |
4c36ddbe | 286 | readfd(f,b,8); |
71c46176 | 287 | ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); |
3a6a366f | 288 | } |
71c46176 AT |
289 | #endif |
290 | ||
3a6a366f AT |
291 | return ret; |
292 | } | |
293 | ||
720b47f2 AT |
294 | void read_buf(int f,char *buf,int len) |
295 | { | |
4c36ddbe | 296 | readfd(f,buf,len); |
720b47f2 AT |
297 | } |
298 | ||
575f2fca AT |
299 | void read_sbuf(int f,char *buf,int len) |
300 | { | |
301 | read_buf(f,buf,len); | |
302 | buf[len] = 0; | |
303 | } | |
304 | ||
182dca5c AT |
305 | unsigned char read_byte(int f) |
306 | { | |
4c36ddbe AT |
307 | unsigned char c; |
308 | read_buf(f,(char *)&c,1); | |
309 | return c; | |
182dca5c | 310 | } |
720b47f2 | 311 | |
7bec6a5c | 312 | |
7bec6a5c | 313 | |
4c36ddbe AT |
314 | /* write len bytes to fd, possibly reading from buffer_f_in if set |
315 | in order to unclog the pipe. don't return until all len | |
316 | bytes have been written */ | |
317 | static void writefd_unbuffered(int fd,char *buf,int len) | |
720b47f2 | 318 | { |
8d9dc9f9 AT |
319 | int total = 0; |
320 | fd_set w_fds, r_fds; | |
4c36ddbe | 321 | int fd_count, count; |
8d9dc9f9 | 322 | struct timeval tv; |
4c36ddbe | 323 | int reading; |
bf9f0168 | 324 | int blocked=0; |
720b47f2 | 325 | |
e44f9a12 AT |
326 | no_flush++; |
327 | ||
4c36ddbe | 328 | while (total < len) { |
8d9dc9f9 AT |
329 | FD_ZERO(&w_fds); |
330 | FD_ZERO(&r_fds); | |
331 | FD_SET(fd,&w_fds); | |
4c36ddbe AT |
332 | fd_count = fd+1; |
333 | ||
c95f1aa9 AT |
334 | reading = (buffer_f_in != -1 && |
335 | read_buffer_len < MAX_READ_BUFFER); | |
336 | ||
4c36ddbe | 337 | if (reading) { |
8d9dc9f9 AT |
338 | FD_SET(buffer_f_in,&r_fds); |
339 | if (buffer_f_in > fd) | |
340 | fd_count = buffer_f_in+1; | |
341 | } | |
342 | ||
8cd9fd4e | 343 | tv.tv_sec = io_timeout?io_timeout:SELECT_TIMEOUT; |
8d9dc9f9 | 344 | tv.tv_usec = 0; |
4c36ddbe AT |
345 | |
346 | count = select(fd_count, | |
347 | reading?&r_fds:NULL, | |
348 | &w_fds,NULL, | |
8cd9fd4e | 349 | &tv); |
4c36ddbe AT |
350 | |
351 | if (count <= 0) { | |
8d9dc9f9 AT |
352 | check_timeout(); |
353 | continue; | |
354 | } | |
4c36ddbe | 355 | |
c95f1aa9 AT |
356 | if (reading && FD_ISSET(buffer_f_in, &r_fds)) { |
357 | read_check(buffer_f_in); | |
358 | } | |
359 | ||
8d9dc9f9 | 360 | if (FD_ISSET(fd, &w_fds)) { |
bf9f0168 AT |
361 | int n = (len-total)>>blocked; |
362 | int ret = write(fd,buf+total,n?n:1); | |
4c36ddbe AT |
363 | |
364 | if (ret == -1 && errno == EINTR) { | |
365 | continue; | |
366 | } | |
367 | ||
f7b93778 AT |
368 | if (ret == -1 && |
369 | (errno == EAGAIN || errno == EWOULDBLOCK)) { | |
bf9f0168 | 370 | blocked++; |
f7b93778 AT |
371 | continue; |
372 | } | |
373 | ||
4c36ddbe AT |
374 | if (ret <= 0) { |
375 | rprintf(FERROR,"erroring writing %d bytes - exiting\n", len); | |
376 | exit_cleanup(1); | |
377 | } | |
378 | ||
bf9f0168 | 379 | blocked = 0; |
4c36ddbe | 380 | total += ret; |
a800434a AT |
381 | stats.total_written += ret; |
382 | ||
4c36ddbe AT |
383 | if (io_timeout) |
384 | last_io = time(NULL); | |
8d9dc9f9 | 385 | } |
4c36ddbe | 386 | } |
e44f9a12 AT |
387 | |
388 | no_flush--; | |
720b47f2 AT |
389 | } |
390 | ||
8d9dc9f9 | 391 | |
d6dead6b AT |
392 | static char *io_buffer; |
393 | static int io_buffer_count; | |
394 | ||
395 | void io_start_buffering(int fd) | |
396 | { | |
8d9dc9f9 | 397 | if (io_buffer) return; |
679e7657 | 398 | multiplex_out_fd = fd; |
8d9dc9f9 | 399 | io_buffer = (char *)malloc(IO_BUFFER_SIZE+4); |
d6dead6b AT |
400 | if (!io_buffer) out_of_memory("writefd"); |
401 | io_buffer_count = 0; | |
8d9dc9f9 AT |
402 | |
403 | /* leave room for the multiplex header in case it's needed */ | |
404 | io_buffer += 4; | |
d6dead6b AT |
405 | } |
406 | ||
8d9dc9f9 | 407 | void io_flush(void) |
d6dead6b | 408 | { |
679e7657 | 409 | int fd = multiplex_out_fd; |
e44f9a12 | 410 | if (!io_buffer_count || no_flush) return; |
8d9dc9f9 AT |
411 | |
412 | if (io_multiplexing_out) { | |
413 | SIVAL(io_buffer-4, 0, (MPLEX_BASE<<24) + io_buffer_count); | |
4c36ddbe | 414 | writefd_unbuffered(fd, io_buffer-4, io_buffer_count+4); |
8d9dc9f9 | 415 | } else { |
4c36ddbe | 416 | writefd_unbuffered(fd, io_buffer, io_buffer_count); |
d6dead6b | 417 | } |
8d9dc9f9 AT |
418 | io_buffer_count = 0; |
419 | } | |
420 | ||
421 | void io_end_buffering(int fd) | |
422 | { | |
423 | io_flush(); | |
424 | if (!io_multiplexing_out) { | |
425 | free(io_buffer-4); | |
426 | io_buffer = NULL; | |
427 | } | |
d6dead6b AT |
428 | } |
429 | ||
4c36ddbe | 430 | static void writefd(int fd,char *buf,int len) |
d6dead6b | 431 | { |
4c36ddbe AT |
432 | if (!io_buffer) { |
433 | writefd_unbuffered(fd, buf, len); | |
434 | return; | |
435 | } | |
d6dead6b AT |
436 | |
437 | while (len) { | |
438 | int n = MIN(len, IO_BUFFER_SIZE-io_buffer_count); | |
439 | if (n > 0) { | |
440 | memcpy(io_buffer+io_buffer_count, buf, n); | |
441 | buf += n; | |
442 | len -= n; | |
443 | io_buffer_count += n; | |
444 | } | |
445 | ||
8d9dc9f9 | 446 | if (io_buffer_count == IO_BUFFER_SIZE) io_flush(); |
d6dead6b | 447 | } |
d6dead6b | 448 | } |
720b47f2 AT |
449 | |
450 | ||
b7922338 | 451 | void write_int(int f,int32 x) |
720b47f2 | 452 | { |
8d9dc9f9 AT |
453 | char b[4]; |
454 | SIVAL(b,0,x); | |
4c36ddbe | 455 | writefd(f,b,4); |
720b47f2 AT |
456 | } |
457 | ||
71c46176 | 458 | void write_longint(int f, int64 x) |
3a6a366f AT |
459 | { |
460 | extern int remote_version; | |
461 | char b[8]; | |
3a6a366f AT |
462 | |
463 | if (remote_version < 16 || x <= 0x7FFFFFFF) { | |
464 | write_int(f, (int)x); | |
465 | return; | |
466 | } | |
467 | ||
468 | write_int(f, -1); | |
469 | SIVAL(b,0,(x&0xFFFFFFFF)); | |
470 | SIVAL(b,4,((x>>32)&0xFFFFFFFF)); | |
471 | ||
4c36ddbe | 472 | writefd(f,b,8); |
3a6a366f AT |
473 | } |
474 | ||
720b47f2 AT |
475 | void write_buf(int f,char *buf,int len) |
476 | { | |
4c36ddbe | 477 | writefd(f,buf,len); |
720b47f2 AT |
478 | } |
479 | ||
f0fca04e AT |
480 | /* write a string to the connection */ |
481 | void write_sbuf(int f,char *buf) | |
482 | { | |
483 | write_buf(f, buf, strlen(buf)); | |
484 | } | |
485 | ||
720b47f2 | 486 | |
182dca5c AT |
487 | void write_byte(int f,unsigned char c) |
488 | { | |
f0fca04e | 489 | write_buf(f,(char *)&c,1); |
182dca5c AT |
490 | } |
491 | ||
f0fca04e AT |
492 | int read_line(int f, char *buf, int maxlen) |
493 | { | |
528bfcd7 AT |
494 | eof_error = 0; |
495 | ||
f0fca04e | 496 | while (maxlen) { |
528bfcd7 | 497 | buf[0] = 0; |
f0fca04e | 498 | read_buf(f, buf, 1); |
528bfcd7 | 499 | if (buf[0] == 0) return 0; |
f0fca04e AT |
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 | } | |
528bfcd7 AT |
513 | |
514 | eof_error = 1; | |
515 | ||
f0fca04e AT |
516 | return 1; |
517 | } | |
518 | ||
519 | ||
520 | void io_printf(int fd, const char *format, ...) | |
521 | { | |
522 | va_list ap; | |
523 | char buf[1024]; | |
524 | int len; | |
525 | ||
526 | va_start(ap, format); | |
e42c9458 | 527 | len = vslprintf(buf, sizeof(buf)-1, format, ap); |
f0fca04e AT |
528 | va_end(ap); |
529 | ||
530 | if (len < 0) exit_cleanup(1); | |
531 | ||
532 | write_sbuf(fd, buf); | |
533 | } | |
8d9dc9f9 AT |
534 | |
535 | ||
536 | /* setup for multiplexing an error stream with the data stream */ | |
537 | void io_start_multiplex_out(int fd) | |
538 | { | |
679e7657 AT |
539 | multiplex_out_fd = fd; |
540 | io_flush(); | |
8d9dc9f9 AT |
541 | io_start_buffering(fd); |
542 | io_multiplexing_out = 1; | |
543 | } | |
544 | ||
545 | /* setup for multiplexing an error stream with the data stream */ | |
546 | void io_start_multiplex_in(int fd) | |
547 | { | |
679e7657 AT |
548 | multiplex_in_fd = fd; |
549 | io_flush(); | |
8d9dc9f9 AT |
550 | if (read_buffer_len) { |
551 | fprintf(stderr,"ERROR: data in read buffer at mplx start\n"); | |
552 | exit_cleanup(1); | |
553 | } | |
554 | ||
555 | io_multiplexing_in = 1; | |
556 | } | |
557 | ||
558 | /* write an message to the error stream */ | |
559 | int io_multiplex_write(int f, char *buf, int len) | |
560 | { | |
561 | if (!io_multiplexing_out) return 0; | |
562 | ||
563 | io_flush(); | |
564 | ||
565 | SIVAL(io_buffer-4, 0, ((MPLEX_BASE + f)<<24) + len); | |
566 | memcpy(io_buffer, buf, len); | |
567 | ||
679e7657 | 568 | writefd_unbuffered(multiplex_out_fd, io_buffer-4, len+4); |
8d9dc9f9 AT |
569 | return 1; |
570 | } | |
571 | ||
572 | void io_close_input(int fd) | |
573 | { | |
574 | buffer_f_in = -1; | |
575 | } |