Gotweb

Blob

Date:: Wed Mar 18 16:10:30 2020 UTC
Message:: Add initial support for network protocol. Ported from git9 by Ori Bernstein.
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 
19 #include <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sha1.h>
24 #include <zlib.h>
25 #include <time.h>
26 
27 #include "got_error.h"
28 #include "got_object.h"
29 #include "got_path.h"
30 
31 #include "got_lib_inflate.h"
32 
33 #ifndef MIN
34 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
35 #endif
36 
37 const struct got_error *
38 got_inflate_init(struct got_inflate_buf *zb, uint8_t *outbuf, size_t bufsize)
39 {
40 	const struct got_error *err = NULL;
41 	int zerr;
42 
43 	memset(&zb->z, 0, sizeof(zb->z));
44 
45 	zb->z.zalloc = Z_NULL;
46 	zb->z.zfree = Z_NULL;
47 	zerr = inflateInit(&zb->z);
48 	if (zerr != Z_OK) {
49 		if  (zerr == Z_ERRNO)
50 			return got_error_from_errno("inflateInit");
51 		if  (zerr == Z_MEM_ERROR) {
52 			errno = ENOMEM;
53 			return got_error_from_errno("inflateInit");
54 		}
55 		return got_error(GOT_ERR_DECOMPRESSION);
56 	}
57 
58 	zb->inlen = zb->outlen = bufsize;
59 
60 	zb->inbuf = calloc(1, zb->inlen);
61 	if (zb->inbuf == NULL) {
62 		err = got_error_from_errno("calloc");
63 		goto done;
64 	}
65 
66 	zb->flags = 0;
67 	if (outbuf == NULL) {
68 		zb->outbuf = calloc(1, zb->outlen);
69 		if (zb->outbuf == NULL) {
70 			err = got_error_from_errno("calloc");
71 			goto done;
72 		}
73 		zb->flags |= GOT_INFLATE_F_OWN_OUTBUF;
74 	} else
75 		zb->outbuf = outbuf;
76 
77 done:
78 	if (err)
79 		got_inflate_end(zb);
80 	return err;
81 }
82 
83 const struct got_error *
84 got_inflate_read(struct got_inflate_buf *zb, FILE *f, size_t *outlenp)
85 {
86 	size_t last_total_out = zb->z.total_out;
87 	z_stream *z = &zb->z;
88 	int ret = Z_ERRNO;
89 	off_t off, consumed;
90 
91 	z->next_out = zb->outbuf;
92 	z->avail_out = zb->outlen;
93 
94 	*outlenp = 0;
95 	off = ftello(f);
96 	consumed = 0;
97 	do {
98 		size_t last_total_in = zb->z.total_in;
99 		if (z->avail_in == 0) {
100 			size_t n = fread(zb->inbuf, 1, zb->inlen, f);
101 			if (n == 0) {
102 				if (ferror(f))
103 					return got_ferror(f, GOT_ERR_IO);
104 				/* EOF */
105 				ret = Z_STREAM_END;
106 				break;
107 			}
108 			z->next_in = zb->inbuf;
109 			z->avail_in = n;
110 		}
111 		ret = inflate(z, Z_SYNC_FLUSH);
112 		consumed += z->total_in - last_total_in;
113 	} while (ret == Z_OK && z->avail_out > 0);
114 
115 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
116 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
117 	} else {
118 		if (ret != Z_STREAM_END)
119 			return got_error(GOT_ERR_DECOMPRESSION);
120 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
121 	}
122 
123 	*outlenp = z->total_out - last_total_out;
124 	fseek(f, off + consumed, SEEK_SET);
125 	return NULL;
126 }
127 
128 const struct got_error *
129 got_inflate_read_fd(struct got_inflate_buf *zb, int fd, size_t *outlenp)
130 {
131 	size_t last_total_out = zb->z.total_out;
132 	z_stream *z = &zb->z;
133 	int ret = Z_ERRNO;
134 
135 	z->next_out = zb->outbuf;
136 	z->avail_out = zb->outlen;
137 
138 	*outlenp = 0;
139 	do {
140 		if (z->avail_in == 0) {
141 			ssize_t n = read(fd, zb->inbuf, zb->inlen);
142 			if (n < 0)
143 				return got_error_from_errno("read");
144 			else if (n == 0) {
145 				/* EOF */
146 				ret = Z_STREAM_END;
147 				break;
148 			}
149 			z->next_in = zb->inbuf;
150 			z->avail_in = n;
151 		}
152 		ret = inflate(z, Z_SYNC_FLUSH);
153 	} while (ret == Z_OK && z->avail_out > 0);
154 
155 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
156 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
157 	} else {
158 		if (ret != Z_STREAM_END)
159 			return got_error(GOT_ERR_DECOMPRESSION);
160 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
161 	}
162 
163 	*outlenp = z->total_out - last_total_out;
164 	return NULL;
165 }
166 
167 const struct got_error *
168 got_inflate_read_mmap(struct got_inflate_buf *zb, uint8_t *map, size_t offset,
169     size_t len, size_t *outlenp, size_t *consumed)
170 {
171 	size_t last_total_out = zb->z.total_out;
172 	z_stream *z = &zb->z;
173 	int ret = Z_ERRNO;
174 
175 	z->next_out = zb->outbuf;
176 	z->avail_out = zb->outlen;
177 
178 	*outlenp = 0;
179 	*consumed = 0;
180 
181 	do {
182 		size_t last_total_in = zb->z.total_in;
183 		if (z->avail_in == 0) {
184 			if (len == 0) {
185 				/* EOF */
186 				ret = Z_STREAM_END;
187 				break;
188 			}
189 			z->next_in = map + offset + *consumed;
190 			z->avail_in = len - *consumed;
191 		}
192 		ret = inflate(z, Z_SYNC_FLUSH);
193 		*consumed += z->total_in - last_total_in;
194 	} while (ret == Z_OK && z->avail_out > 0);
195 
196 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
197 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
198 	} else {
199 		if (ret != Z_STREAM_END)
200 			return got_error(GOT_ERR_DECOMPRESSION);
201 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
202 	}
203 
204 	*outlenp = z->total_out - last_total_out;
205 	return NULL;
206 }
207 
208 void
209 got_inflate_end(struct got_inflate_buf *zb)
210 {
211 	free(zb->inbuf);
212 	if (zb->flags & GOT_INFLATE_F_OWN_OUTBUF)
213 		free(zb->outbuf);
214 	inflateEnd(&zb->z);
215 }
216 
217 const struct got_error *
218 got_inflate_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
219 {
220 	const struct got_error *err;
221 	size_t avail;
222 	struct got_inflate_buf zb;
223 	void *newbuf;
224 	int nbuf = 1;
225 
226 	*outbuf = malloc(GOT_INFLATE_BUFSIZE);
227 	if (*outbuf == NULL)
228 		return got_error_from_errno("malloc");
229 	err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE);
230 	if (err)
231 		return err;
232 
233 	*outlen = 0;
234 
235 	do {
236 		err = got_inflate_read(&zb, f, &avail);
237 		if (err)
238 			goto done;
239 		*outlen += avail;
240 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
241 			newbuf = reallocarray(*outbuf, ++nbuf,
242 			   GOT_INFLATE_BUFSIZE);
243 			if (newbuf == NULL) {
244 				err = got_error_from_errno("reallocarray");
245 				free(*outbuf);
246 				*outbuf = NULL;
247 				*outlen = 0;
248 				goto done;
249 			}
250 			*outbuf = newbuf;
251 			zb.outbuf = newbuf + *outlen;
252 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
253 		}
254 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
255 
256 done:
257 	got_inflate_end(&zb);
258 	return err;
259 }
260 
261 const struct got_error *
262 got_inflate_to_mem_fd(uint8_t **outbuf, size_t *outlen, int infd)
263 {
264 	const struct got_error *err;
265 	size_t avail;
266 	struct got_inflate_buf zb;
267 	void *newbuf;
268 	int nbuf = 1;
269 
270 	*outbuf = malloc(GOT_INFLATE_BUFSIZE);
271 	if (*outbuf == NULL)
272 		return got_error_from_errno("malloc");
273 	err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE);
274 	if (err)
275 		goto done;
276 
277 	*outlen = 0;
278 
279 	do {
280 		err = got_inflate_read_fd(&zb, infd, &avail);
281 		if (err)
282 			goto done;
283 		*outlen += avail;
284 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
285 			newbuf = reallocarray(*outbuf, ++nbuf,
286 			    GOT_INFLATE_BUFSIZE);
287 			if (newbuf == NULL) {
288 				err = got_error_from_errno("reallocarray");
289 				free(*outbuf);
290 				*outbuf = NULL;
291 				*outlen = 0;
292 				goto done;
293 			}
294 			*outbuf = newbuf;
295 			zb.outbuf = newbuf + *outlen;
296 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
297 		}
298 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
299 
300 done:
301 	got_inflate_end(&zb);
302 	return err;
303 }
304 
305 const struct got_error *
306 got_inflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen, uint8_t *map,
307     size_t offset, size_t len)
308 {
309 	const struct got_error *err;
310 	size_t avail, consumed;
311 	struct got_inflate_buf zb;
312 	void *newbuf;
313 	int nbuf = 1;
314 
315 	*outbuf = malloc(GOT_INFLATE_BUFSIZE);
316 	if (*outbuf == NULL)
317 		return got_error_from_errno("malloc");
318 	err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE);
319 	if (err) {
320 		free(*outbuf);
321 		*outbuf = NULL;
322 		return err;
323 	}
324 
325 	*outlen = 0;
326 
327 	do {
328 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
329 		    &consumed);
330 		if (err)
331 			goto done;
332 		offset += consumed;
333 		len -= consumed;
334 		*outlen += avail;
335 		if (len == 0)
336 			break;
337 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
338 			newbuf = reallocarray(*outbuf, ++nbuf,
339 			    GOT_INFLATE_BUFSIZE);
340 			if (newbuf == NULL) {
341 				err = got_error_from_errno("reallocarray");
342 				free(*outbuf);
343 				*outbuf = NULL;
344 				*outlen = 0;
345 				goto done;
346 			}
347 			*outbuf = newbuf;
348 			zb.outbuf = newbuf + *outlen;
349 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
350 		}
351 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
352 done:
353 	got_inflate_end(&zb);
354 	return err;
355 }
356 
357 const struct got_error *
358 got_inflate_to_fd(size_t *outlen, FILE *infile, int outfd)
359 {
360 	const struct got_error *err = NULL;
361 	size_t avail;
362 	struct got_inflate_buf zb;
363 
364 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
365 	if (err)
366 		goto done;
367 
368 	*outlen = 0;
369 
370 	do {
371 		err = got_inflate_read(&zb, infile, &avail);
372 		if (err)
373 			goto done;
374 		if (avail > 0) {
375 			ssize_t n;
376 			n = write(outfd, zb.outbuf, avail);
377 			if (n != avail) {
378 				err = got_error_from_errno("write");
379 				goto done;
380 			}
381 			*outlen += avail;
382 		}
383 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
384 
385 done:
386 	if (err == NULL) {
387 		if (lseek(outfd, SEEK_SET, 0) == -1)
388 			err = got_error_from_errno("lseek");
389 	}
390 	got_inflate_end(&zb);
391 	return err;
392 }
393 
394 const struct got_error *
395 got_inflate_to_file(size_t *outlen, FILE *infile, FILE *outfile)
396 {
397 	const struct got_error *err;
398 	size_t avail;
399 	struct got_inflate_buf zb;
400 
401 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
402 	if (err)
403 		goto done;
404 
405 	*outlen = 0;
406 
407 	do {
408 		err = got_inflate_read(&zb, infile, &avail);
409 		if (err)
410 			goto done;
411 		if (avail > 0) {
412 			size_t n;
413 			n = fwrite(zb.outbuf, avail, 1, outfile);
414 			if (n != 1) {
415 				err = got_ferror(outfile, GOT_ERR_IO);
416 				goto done;
417 			}
418 			*outlen += avail;
419 		}
420 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
421 
422 done:
423 	if (err == NULL)
424 		rewind(outfile);
425 	got_inflate_end(&zb);
426 	return err;
427 }
428 
429 const struct got_error *
430 got_inflate_to_file_fd(size_t *outlen, int infd, FILE *outfile)
431 {
432 	const struct got_error *err;
433 	size_t avail;
434 	struct got_inflate_buf zb;
435 
436 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
437 	if (err)
438 		goto done;
439 
440 	*outlen = 0;
441 
442 	do {
443 		err = got_inflate_read_fd(&zb, infd, &avail);
444 		if (err)
445 			goto done;
446 		if (avail > 0) {
447 			size_t n;
448 			n = fwrite(zb.outbuf, avail, 1, outfile);
449 			if (n != 1) {
450 				err = got_ferror(outfile, GOT_ERR_IO);
451 				goto done;
452 			}
453 			*outlen += avail;
454 		}
455 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
456 
457 done:
458 	if (err == NULL)
459 		rewind(outfile);
460 	got_inflate_end(&zb);
461 	return err;
462 }
463 
464 const struct got_error *
465 got_inflate_to_file_mmap(size_t *outlen, uint8_t *map, size_t offset,
466     size_t len, FILE *outfile)
467 {
468 	const struct got_error *err;
469 	size_t avail;
470 	struct got_inflate_buf zb;
471 	size_t consumed;
472 
473 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
474 	if (err)
475 		goto done;
476 
477 	*outlen = 0;
478 
479 	do {
480 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
481 		    &consumed);
482 		if (err)
483 			goto done;
484 		offset += consumed;
485 		len -= consumed;
486 		if (avail > 0) {
487 			size_t n;
488 			n = fwrite(zb.outbuf, avail, 1, outfile);
489 			if (n != 1) {
490 				err = got_ferror(outfile, GOT_ERR_IO);
491 				goto done;
492 			}
493 			*outlen += avail;
494 		}
495 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
496 
497 done:
498 	if (err == NULL)
499 		rewind(outfile);
500 	got_inflate_end(&zb);
501 	return err;
502 }