1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2019, Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 /*
19  * All code runs under the same UID but sensitive code paths are
20  * run in a separate process with tighter pledge(2) promises.
21  * Data is communicated between processes via imsg_flush(3) and imsg_read(3).
22  * This behaviour is transparent to users of the library.
23  *
24  * We generally transmit data in imsg buffers, split across several messages
25  * if necessary. File descriptors are used in cases where this is impractical,
26  * such as when accessing pack files or when transferring large blobs.
27  *
28  * We exec(2) after a fork(2). Parts of our library functionality are
29  * accessible via separate executables in a libexec directory.
30  */
31 
32 #define GOT_IMSG_FD_CHILD (STDERR_FILENO + 1)
33 
34 #ifndef GOT_LIBEXECDIR
35 #define GOT_LIBEXECDIR /usr/libexec
36 #endif
37 
38 /* Names of helper programs in libexec directory */
39 #define GOT_PROG_READ_OBJECT	got-read-object
40 #define GOT_PROG_READ_TREE	got-read-tree
41 #define GOT_PROG_READ_COMMIT	got-read-commit
42 #define GOT_PROG_READ_BLOB	got-read-blob
43 #define GOT_PROG_READ_TAG	got-read-tag
44 #define GOT_PROG_READ_PACK	got-read-pack
45 #define GOT_PROG_READ_GITCONFIG	got-read-gitconfig
46 #define GOT_PROG_READ_GOTCONFIG	got-read-gotconfig
47 #define GOT_PROG_READ_PATCH	got-read-patch
48 #define GOT_PROG_FETCH_PACK	got-fetch-pack
49 #define GOT_PROG_INDEX_PACK	got-index-pack
50 #define GOT_PROG_SEND_PACK	got-send-pack
51 
52 #define GOT_STRINGIFY(x) #x
53 #define GOT_STRINGVAL(x) GOT_STRINGIFY(x)
54 
55 /* Paths to helper programs in libexec directory */
56 #define GOT_PATH_PROG_READ_OBJECT \
57 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_OBJECT)
58 #define GOT_PATH_PROG_READ_TREE \
59 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TREE)
60 #define GOT_PATH_PROG_READ_COMMIT \
61 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_COMMIT)
62 #define GOT_PATH_PROG_READ_BLOB \
63 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_BLOB)
64 #define GOT_PATH_PROG_READ_TAG \
65 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TAG)
66 #define GOT_PATH_PROG_READ_PACK \
67 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_PACK)
68 #define GOT_PATH_PROG_READ_GITCONFIG \
69 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GITCONFIG)
70 #define GOT_PATH_PROG_READ_GOTCONFIG \
71 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GOTCONFIG)
72 #define GOT_PATH_PROG_READ_PATCH \
73 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_PATCH)
74 #define GOT_PATH_PROG_FETCH_PACK \
75 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_FETCH_PACK)
76 #define GOT_PATH_PROG_SEND_PACK \
77 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_SEND_PACK)
78 #define GOT_PATH_PROG_INDEX_PACK \
79 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_INDEX_PACK)
80 
81 struct got_privsep_child {
82 	int imsg_fd;
83 	pid_t pid;
84 	struct imsgbuf *ibuf;
85 };
86 
87 enum got_imsg_type {
88 	/* An error occured while processing a request. */
89 	GOT_IMSG_ERROR,
90 
91 	/* Stop the child process. */
92 	GOT_IMSG_STOP,
93 
94 	/*
95 	 * Messages concerned with read access to objects in a repository.
96 	 * Object and pack files are opened by the main process, where
97 	 * data may be read as a byte string but without any interpretation.
98 	 * Decompression and parsing of object and pack files occurs in a
99 	 * separate process which runs under pledge("stdio recvfd").
100 	 * This sandboxes our own repository parsing code, as well as zlib.
101 	 */
102 	GOT_IMSG_OBJECT_REQUEST,
103 	GOT_IMSG_OBJECT,
104 	GOT_IMSG_COMMIT_REQUEST,
105 	GOT_IMSG_COMMIT,
106 	GOT_IMSG_COMMIT_LOGMSG,
107 	GOT_IMSG_TREE_REQUEST,
108 	GOT_IMSG_TREE,
109 	GOT_IMSG_TREE_ENTRIES,
110 	GOT_IMSG_BLOB_REQUEST,
111 	GOT_IMSG_BLOB_OUTFD,
112 	GOT_IMSG_BLOB,
113 	GOT_IMSG_TAG_REQUEST,
114 	GOT_IMSG_TAG,
115 	GOT_IMSG_TAG_TAGMSG,
116 
117 	/* Messages related to networking. */
118 	GOT_IMSG_FETCH_REQUEST,
119 	GOT_IMSG_FETCH_HAVE_REF,
120 	GOT_IMSG_FETCH_WANTED_BRANCH,
121 	GOT_IMSG_FETCH_WANTED_REF,
122 	GOT_IMSG_FETCH_OUTFD,
123 	GOT_IMSG_FETCH_SYMREFS,
124 	GOT_IMSG_FETCH_REF,
125 	GOT_IMSG_FETCH_SERVER_PROGRESS,
126 	GOT_IMSG_FETCH_DOWNLOAD_PROGRESS,
127 	GOT_IMSG_FETCH_DONE,
128 	GOT_IMSG_IDXPACK_REQUEST,
129 	GOT_IMSG_IDXPACK_OUTFD,
130 	GOT_IMSG_IDXPACK_PROGRESS,
131 	GOT_IMSG_IDXPACK_DONE,
132 	GOT_IMSG_SEND_REQUEST,
133 	GOT_IMSG_SEND_REF,
134 	GOT_IMSG_SEND_REMOTE_REF,
135 	GOT_IMSG_SEND_REF_STATUS,
136 	GOT_IMSG_SEND_PACK_REQUEST,
137 	GOT_IMSG_SEND_PACKFD,
138 	GOT_IMSG_SEND_UPLOAD_PROGRESS,
139 	GOT_IMSG_SEND_DONE,
140 
141 	/* Messages related to pack files. */
142 	GOT_IMSG_PACKIDX,
143 	GOT_IMSG_PACK,
144 	GOT_IMSG_PACKED_OBJECT_REQUEST,
145 	GOT_IMSG_COMMIT_TRAVERSAL_REQUEST,
146 	GOT_IMSG_TRAVERSED_COMMITS,
147 	GOT_IMSG_COMMIT_TRAVERSAL_DONE,
148 	GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
149 	GOT_IMSG_ENUMERATED_COMMIT,
150 	GOT_IMSG_ENUMERATED_TREE,
151 	GOT_IMSG_TREE_ENUMERATION_DONE,
152 	GOT_IMSG_OBJECT_ENUMERATION_DONE,
153 	GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
154 
155 	/* Message sending file descriptor to a temporary file. */
156 	GOT_IMSG_TMPFD,
157 
158 	/* Messages related to gitconfig files. */
159 	GOT_IMSG_GITCONFIG_PARSE_REQUEST,
160 	GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST,
161 	GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST,
162 	GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST,
163 	GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST,
164 	GOT_IMSG_GITCONFIG_REMOTES_REQUEST,
165 	GOT_IMSG_GITCONFIG_INT_VAL,
166 	GOT_IMSG_GITCONFIG_STR_VAL,
167 	GOT_IMSG_GITCONFIG_REMOTES,
168 	GOT_IMSG_GITCONFIG_REMOTE,
169 	GOT_IMSG_GITCONFIG_OWNER_REQUEST,
170 	GOT_IMSG_GITCONFIG_OWNER,
171 
172 	/* Messages related to gotconfig files. */
173 	GOT_IMSG_GOTCONFIG_PARSE_REQUEST,
174 	GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST,
175 	GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST,
176 	GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST,
177 	GOT_IMSG_GOTCONFIG_REMOTES_REQUEST,
178 	GOT_IMSG_GOTCONFIG_INT_VAL,
179 	GOT_IMSG_GOTCONFIG_STR_VAL,
180 	GOT_IMSG_GOTCONFIG_REMOTES,
181 	GOT_IMSG_GOTCONFIG_REMOTE,
182 
183 	/* Raw object access. Uncompress object data but do not parse it. */
184 	GOT_IMSG_RAW_OBJECT_REQUEST,
185 	GOT_IMSG_RAW_OBJECT_OUTFD,
186 	GOT_IMSG_PACKED_RAW_OBJECT_REQUEST,
187 	GOT_IMSG_RAW_OBJECT,
188 
189 	/* Read raw delta data from pack files. */
190 	GOT_IMSG_RAW_DELTA_OUTFD,
191 	GOT_IMSG_RAW_DELTA_REQUEST,
192 	GOT_IMSG_RAW_DELTA,
193 
194 	/* Re-use deltas found in a pack file. */
195 	GOT_IMSG_DELTA_REUSE_REQUEST,
196 	GOT_IMSG_REUSED_DELTAS,
197 	GOT_IMSG_DELTA_REUSE_DONE,
198 
199 	/* Commit coloring in got-read-pack. */
200 	GOT_IMSG_COMMIT_PAINTING_INIT,
201 	GOT_IMSG_COMMIT_PAINTING_REQUEST,
202 	GOT_IMSG_PAINTED_COMMITS,
203 	GOT_IMSG_COMMIT_PAINTING_DONE,
204 
205 	/* Transfer a list of object IDs. */
206 	GOT_IMSG_OBJ_ID_LIST,
207 	GOT_IMSG_OBJ_ID_LIST_DONE,
208 
209 	/* Messages related to patch files. */
210 	GOT_IMSG_PATCH_FILE,
211 	GOT_IMSG_PATCH_HUNK,
212 	GOT_IMSG_PATCH_DONE,
213 	GOT_IMSG_PATCH_LINE,
214 	GOT_IMSG_PATCH,
215 	GOT_IMSG_PATCH_EOF,
216 };
217 
218 /* Structure for GOT_IMSG_ERROR. */
219 struct got_imsg_error {
220 	int code; /* an error code from got_error.h */
221 	int errno_code; /* in case code equals GOT_ERR_ERRNO */
222 } __attribute__((__packed__));
223 
224 /*
225  * Structure for GOT_IMSG_TREE_REQUEST and GOT_IMSG_OBJECT data.
226  */
227 struct got_imsg_object {
228 	uint8_t id[SHA1_DIGEST_LENGTH];
229 
230 	/* These fields are the same as in struct got_object. */
231 	int type;
232 	int flags;
233 	size_t hdrlen;
234 	size_t size;
235 	off_t pack_offset;
236 	int pack_idx;
237 }  __attribute__((__packed__));
238 
239 /* Structure for GOT_IMSG_COMMIT data. */
240 struct got_imsg_commit_object {
241 	uint8_t tree_id[SHA1_DIGEST_LENGTH];
242 	size_t author_len;
243 	time_t author_time;
244 	time_t author_gmtoff;
245 	size_t committer_len;
246 	time_t committer_time;
247 	time_t committer_gmtoff;
248 	size_t logmsg_len;
249 	int nparents;
250 
251 	/*
252 	 * Followed by author_len + committer_len data bytes
253 	 */
254 
255 	/* Followed by 'nparents' SHA1_DIGEST_LENGTH length strings */
256 
257 	/*
258 	 * Followed by 'logmsg_len' bytes of commit log message data in
259 	 * one or more GOT_IMSG_COMMIT_LOGMSG messages.
260 	 */
261 } __attribute__((__packed__));
262 
263 struct got_imsg_tree_entry {
264 	char id[SHA1_DIGEST_LENGTH];
265 	mode_t mode;
266 	size_t namelen;
267 	/* Followed by namelen bytes of entry's name, not NUL-terminated. */
268 } __attribute__((__packed__));
269 
270 /* Structure for GOT_IMSG_TREE_ENTRIES. */
271 struct got_imsg_tree_entries {
272 	size_t nentries; /* Number of tree entries contained in this message. */
273 
274 	/* Followed by nentries * struct got_imsg_tree_entry */
275 };
276 
277 /* Structure for GOT_IMSG_TREE_OBJECT_REPLY data. */
278 struct got_imsg_tree_object {
279 	int nentries; /* This many tree entries follow. */
280 };
281 
282 /* Structure for GOT_IMSG_BLOB. */
283 struct got_imsg_blob {
284 	size_t size;
285 	size_t hdrlen;
286 
287 	/*
288 	 * If size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX, blob data follows
289 	 * in the imsg buffer. Otherwise, blob data has been written to a
290 	 * file descriptor passed via the GOT_IMSG_BLOB_OUTFD imsg.
291 	 */
292 #define GOT_PRIVSEP_INLINE_BLOB_DATA_MAX \
293 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_blob))
294 };
295 
296 /* Structure for GOT_IMSG_RAW_OBJECT. */
297 struct got_imsg_raw_obj {
298 	off_t size;
299 	size_t hdrlen;
300 
301 	/*
302 	 * If size <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX, object data follows
303 	 * in the imsg buffer. Otherwise, object data has been written to a
304 	 * file descriptor passed via the GOT_IMSG_RAW_OBJECT_OUTFD imsg.
305 	 */
306 #define GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX \
307 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_raw_obj))
308 };
309 
310 /* Structure for GOT_IMSG_RAW_DELTA. */
311 struct got_imsg_raw_delta {
312 	uint8_t base_id[SHA1_DIGEST_LENGTH];
313 	uint64_t base_size;
314 	uint64_t result_size;
315 	off_t delta_size;
316 	off_t delta_compressed_size;
317 	off_t delta_offset;
318 	off_t delta_out_offset;
319 
320 	/*
321 	 * Delta data has been written at delta_out_offset to the file
322 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
323 	 */
324 };
325 
326 /* Structures for GOT_IMSG_REUSED_DELTAS. */
327 struct got_imsg_reused_delta {
328 	struct got_object_id id;
329 	struct got_object_id base_id;
330 	uint64_t base_size;
331 	uint64_t result_size;
332 	off_t delta_size;
333 	off_t delta_compressed_size;
334 	off_t delta_offset;
335 	off_t delta_out_offset;
336 
337 	/*
338 	 * Delta data has been written at delta_out_offset to the file
339 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
340 	 */
341 };
342 struct got_imsg_reused_deltas {
343 	size_t ndeltas;
344 
345 	/*
346 	 * Followed by ndeltas * struct got_imsg_reused_delta.
347 	 */
348 
349 #define GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS \
350 	((MAX_IMSGSIZE - IMSG_HEADER_SIZE - \
351 	sizeof(struct got_imsg_reused_deltas)) \
352 	/ sizeof(struct got_imsg_reused_delta))
353 };
354 
355 /* Structure for GOT_IMSG_COMMIT_PAINTING_REQUEST. */
356 struct got_imsg_commit_painting_request {
357 	uint8_t id[SHA1_DIGEST_LENGTH];
358 	int idx;
359 	int color;
360 } __attribute__((__packed__));
361 
362 /* Structure for GOT_IMSG_PAINTED_COMMITS. */
363 struct got_imsg_painted_commit {
364 	uint8_t id[SHA1_DIGEST_LENGTH];
365 	intptr_t color;
366 } __attribute__((__packed__));
367 
368 struct got_imsg_painted_commits {
369 	int ncommits;
370 	int present_in_pack;
371 	/*
372 	 * Followed by ncommits * struct got_imsg_painted_commit.
373 	 */
374 } __attribute__((__packed__));
375 
376 /* Structure for GOT_IMSG_TAG data. */
377 struct got_imsg_tag_object {
378 	uint8_t id[SHA1_DIGEST_LENGTH];
379 	int obj_type;
380 	size_t tag_len;
381 	size_t tagger_len;
382 	time_t tagger_time;
383 	time_t tagger_gmtoff;
384 	size_t tagmsg_len;
385 
386 	/*
387 	 * Followed by tag_len + tagger_len data bytes
388 	 */
389 
390 	/*
391 	 * Followed by 'tagmsg_len' bytes of tag message data in
392 	 * one or more GOT_IMSG_TAG_TAGMSG messages.
393 	 */
394 } __attribute__((__packed__));
395 
396 /* Structure for GOT_IMSG_FETCH_HAVE_REF data. */
397 struct got_imsg_fetch_have_ref {
398 	uint8_t id[SHA1_DIGEST_LENGTH];
399 	size_t name_len;
400 	/* Followed by name_len data bytes. */
401 } __attribute__((__packed__));
402 
403 /* Structure for GOT_IMSG_FETCH_WANTED_BRANCH data. */
404 struct got_imsg_fetch_wanted_branch {
405 	size_t name_len;
406 	/* Followed by name_len data bytes. */
407 } __attribute__((__packed__));
408 
409 /* Structure for GOT_IMSG_FETCH_WANTED_REF data. */
410 struct got_imsg_fetch_wanted_ref {
411 	size_t name_len;
412 	/* Followed by name_len data bytes. */
413 } __attribute__((__packed__));
414 
415 /* Structure for GOT_IMSG_FETCH_REQUEST data. */
416 struct got_imsg_fetch_request {
417 	int fetch_all_branches;
418 	int list_refs_only;
419 	int verbosity;
420 	size_t n_have_refs;
421 	size_t n_wanted_branches;
422 	size_t n_wanted_refs;
423 	/* Followed by n_have_refs GOT_IMSG_FETCH_HAVE_REF messages. */
424 	/* Followed by n_wanted_branches times GOT_IMSG_FETCH_WANTED_BRANCH. */
425 	/* Followed by n_wanted_refs times GOT_IMSG_FETCH_WANTED_REF. */
426 } __attribute__((__packed__));
427 
428 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
429 struct got_imsg_fetch_symref {
430 	size_t name_len;
431 	size_t target_len;
432 
433 	/*
434 	 * Followed by name_len + target_len data bytes.
435 	 */
436 } __attribute__((__packed__));
437 
438 struct got_imsg_fetch_symrefs {
439 	size_t nsymrefs;
440 
441 	/* Followed by nsymrefs times of got_imsg_fetch_symref data. */
442 } __attribute__((__packed__));
443 
444 /* Structure for GOT_IMSG_FETCH_REF data. */
445 struct got_imsg_fetch_ref {
446 	/* Describes a reference which will be fetched. */
447 	uint8_t refid[SHA1_DIGEST_LENGTH];
448 	/* Followed by reference name in remaining data of imsg buffer. */
449 };
450 
451 /* Structure for GOT_IMSG_FETCH_DOWNLOAD_PROGRESS data. */
452 struct got_imsg_fetch_download_progress {
453 	/* Number of packfile data bytes downloaded so far. */
454 	off_t packfile_bytes;
455 };
456 
457 /* Structure for GOT_IMSG_SEND_REQUEST data. */
458 struct got_imsg_send_request {
459 	int verbosity;
460 	size_t nrefs;
461 	/* Followed by nrefs GOT_IMSG_SEND_REF messages. */
462 } __attribute__((__packed__));
463 
464 /* Structure for GOT_IMSG_SEND_UPLOAD_PROGRESS data. */
465 struct got_imsg_send_upload_progress {
466 	/* Number of packfile data bytes uploaded so far. */
467 	off_t packfile_bytes;
468 };
469 
470 /* Structure for GOT_IMSG_SEND_REF data. */
471 struct got_imsg_send_ref {
472 	uint8_t id[SHA1_DIGEST_LENGTH];
473 	int delete;
474 	size_t name_len;
475 	/* Followed by name_len data bytes. */
476 } __attribute__((__packed__));
477 
478 /* Structure for GOT_IMSG_SEND_REMOTE_REF data. */
479 struct got_imsg_send_remote_ref {
480 	uint8_t id[SHA1_DIGEST_LENGTH];
481 	size_t name_len;
482 	/* Followed by name_len data bytes. */
483 } __attribute__((__packed__));
484 
485 /* Structure for GOT_IMSG_SEND_REF_STATUS data. */
486 struct got_imsg_send_ref_status {
487 	int success;
488 	size_t name_len;
489 	/* Followed by name_len data bytes. */
490 } __attribute__((__packed__));
491 
492 /* Structure for GOT_IMSG_IDXPACK_REQUEST data. */
493 struct got_imsg_index_pack_request {
494 	uint8_t pack_hash[SHA1_DIGEST_LENGTH];
495 } __attribute__((__packed__));
496 
497 /* Structure for GOT_IMSG_IDXPACK_PROGRESS data. */
498 struct got_imsg_index_pack_progress {
499 	/* Total number of objects in pack file. */
500 	int nobj_total;
501 
502 	/* Number of objects indexed so far. */
503 	int nobj_indexed;
504 
505 	/* Number of non-deltified objects in pack file. */
506 	int nobj_loose;
507 
508 	/* Number of deltified objects resolved so far. */
509 	int nobj_resolved;
510 };
511 
512 /* Structure for GOT_IMSG_PACKIDX. */
513 struct got_imsg_packidx {
514 	size_t len;
515 	off_t packfile_size;
516 	/* Additionally, a file desciptor is passed via imsg. */
517 };
518 
519 /* Structure for GOT_IMSG_PACK. */
520 struct got_imsg_pack {
521 	char path_packfile[PATH_MAX];
522 	size_t filesize;
523 	/* Additionally, a file desciptor is passed via imsg. */
524 } __attribute__((__packed__));
525 
526 /*
527  * Structure for GOT_IMSG_OBJECT_REQUEST, GOT_IMSG_BLOB_REQUEST,
528  * GOT_IMSG_TREE_REQUEST, GOT_IMSG_COMMIT_REQUEST, and
529  * GOT_IMSG_TAG_REQUEST data.
530  */
531 struct got_object_id;
532 
533 /*
534  * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST and
535  * GOT_IMSG_PACKED_RAW_OBJECT_REQUEST data.
536  */
537 struct got_imsg_packed_object {
538 	uint8_t id[SHA1_DIGEST_LENGTH];
539 	int idx;
540 } __attribute__((__packed__));
541 
542 /*
543  * Structure for GOT_IMSG_DELTA data.
544  */
545 struct got_imsg_delta {
546 	/* These fields are the same as in struct got_delta. */
547 	off_t offset;
548 	size_t tslen;
549 	int type;
550 	size_t size;
551 	off_t data_offset;
552 };
553 
554 /*
555  * Structure for GOT_IMSG_RAW_DELTA_REQUEST data.
556  */
557 struct got_imsg_raw_delta_request {
558 	uint8_t id[SHA1_DIGEST_LENGTH];
559 	int idx;
560 };
561 
562 /*
563  * Structure for GOT_IMSG_OBJ_ID_LIST data.
564  * Multiple such messages may be sent back-to-back, where each message
565  * contains a chunk of IDs. The entire list must be terminated with a
566  * GOT_IMSG_OBJ_ID_LIST_DONE message.
567  */
568 struct got_imsg_object_idlist {
569 	size_t nids;
570 
571 	/*
572 	 * Followed by nids * struct got_object_id.
573 	 */
574 
575 #define GOT_IMSG_OBJ_ID_LIST_MAX_NIDS \
576 	((MAX_IMSGSIZE - IMSG_HEADER_SIZE - \
577 	sizeof(struct got_imsg_object_idlist)) / sizeof(struct got_object_id))
578 };
579 
580 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST  */
581 struct got_imsg_commit_traversal_request {
582 	uint8_t id[SHA1_DIGEST_LENGTH];
583 	int idx;
584 	size_t path_len;
585 	/* Followed by path_len bytes of path data */
586 } __attribute__((__packed__));
587 
588 /* Structure for GOT_IMSG_TRAVERSED_COMMITS  */
589 struct got_imsg_traversed_commits {
590 	size_t ncommits;
591 	/* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
592 } __attribute__((__packed__));
593 
594 /* Structure for GOT_IMSG_ENUMERATED_COMMIT  */
595 struct got_imsg_enumerated_commit {
596 	uint8_t id[SHA1_DIGEST_LENGTH];
597 	time_t mtime;
598 } __attribute__((__packed__));
599 
600 /* Structure for GOT_IMSG_ENUMERATED_TREE */
601 struct got_imsg_enumerated_tree {
602 	uint8_t id[SHA1_DIGEST_LENGTH]; /* tree ID */
603 	int nentries;			/* number of tree entries */
604 
605 	/* Followed by tree's path in remaining data of imsg buffer. */
606 
607 	/* Followed by nentries * GOT_IMSG_TREE_ENTRY messages. */
608 } __attribute__((__packed__));
609 
610 /*
611  * Structure for GOT_IMSG_GOTCONFIG_REMOTE and
612  * GOT_IMSG_GOTCONFIG_REMOTE data.
613  */
614 struct got_imsg_remote {
615 	size_t name_len;
616 	size_t fetch_url_len;
617 	size_t send_url_len;
618 	int mirror_references;
619 	int fetch_all_branches;
620 	int nfetch_branches;
621 	int nsend_branches;
622 	int nfetch_refs;
623 
624 	/* Followed by name_len data bytes. */
625 	/* Followed by fetch_url_len + send_url_len data bytes. */
626 	/* Followed by nfetch_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
627 	/* Followed by nsend_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
628 	/* Followed by nfetch_refs GOT_IMSG_GITCONFIG_STR_VAL messages. */
629 } __attribute__((__packed__));
630 
631 /*
632  * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
633  */
634 struct got_imsg_remotes {
635 	int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
636 };
637 
638 /*
639  * Structure for GOT_IMSG_PATCH data.
640  */
641 struct got_imsg_patch {
642 	int	git;
643 	char	old[PATH_MAX];
644 	char	new[PATH_MAX];
645 	char	cid[41];
646 	char	blob[41];
647 };
648 
649 /*
650  * Structure for GOT_IMSG_PATCH_HUNK data.
651  */
652 struct got_imsg_patch_hunk {
653 	int	oldfrom;
654 	int	oldlines;
655 	int	newfrom;
656 	int	newlines;
657 };
658 
659 struct got_remote_repo;
660 struct got_pack;
661 struct got_packidx;
662 struct got_pathlist_head;
663 
664 const struct got_error *got_send_ack(pid_t);
665 const struct got_error *got_privsep_wait_for_child(pid_t);
666 const struct got_error *got_privsep_flush_imsg(struct imsgbuf *);
667 const struct got_error *got_privsep_send_stop(int);
668 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
669     size_t);
670 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
671 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
672 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
673 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int,
674     struct got_object_id *);
675 const struct got_error *got_privsep_send_raw_obj_req(struct imsgbuf *, int,
676     struct got_object_id *);
677 const struct got_error *got_privsep_send_raw_obj_outfd(struct imsgbuf *, int);
678 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
679     struct got_object_id *, int);
680 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
681     struct got_object_id *, int);
682 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
683     struct got_object_id *, int);
684 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
685     struct got_object_id *, int);
686 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
687 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
688 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
689     struct got_object *);
690 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *,
691     uint8_t *, int);
692 const struct got_error *got_privsep_send_index_pack_outfd(struct imsgbuf *,
693     int);
694 const struct got_error *got_privsep_recv_index_progress(int *, int *, int *,
695     int *, int *, struct imsgbuf *ibuf);
696 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int,
697     struct got_pathlist_head *, int, struct got_pathlist_head *,
698     struct got_pathlist_head *, int, int);
699 const struct got_error *got_privsep_send_fetch_outfd(struct imsgbuf *, int);
700 const struct got_error *got_privsep_recv_fetch_progress(int *,
701     struct got_object_id **, char **, struct got_pathlist_head *, char **,
702     off_t *, uint8_t *, struct imsgbuf *);
703 const struct got_error *got_privsep_send_send_req(struct imsgbuf *, int,
704     struct got_pathlist_head *, struct got_pathlist_head *, int);
705 const struct got_error *got_privsep_recv_send_remote_refs(
706     struct got_pathlist_head *, struct imsgbuf *);
707 const struct got_error *got_privsep_send_packfd(struct imsgbuf *, int);
708 const struct got_error *got_privsep_recv_send_progress(int *, off_t *,
709     int *, char **, struct imsgbuf *);
710 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
711     struct imsg *, struct imsgbuf *);
712 const struct got_error *got_privsep_recv_obj(struct got_object **,
713     struct imsgbuf *);
714 const struct got_error *got_privsep_send_raw_obj(struct imsgbuf *, off_t,
715     size_t, uint8_t *);
716 const struct got_error *got_privsep_recv_raw_obj(uint8_t **, off_t *, size_t *,
717     struct imsgbuf *);
718 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
719     struct got_commit_object *);
720 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
721     struct imsgbuf *);
722 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
723     struct imsgbuf *);
724 struct got_parsed_tree_entry;
725 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
726     struct got_parsed_tree_entry *, int);
727 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
728     const uint8_t *);
729 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
730     struct imsgbuf *);
731 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
732     struct got_tag_object *);
733 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
734     struct imsgbuf *);
735 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
736     struct got_pack *, struct got_packidx *);
737 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
738     struct got_object_id *);
739 const struct got_error *got_privsep_send_packed_raw_obj_req(struct imsgbuf *,
740     int, struct got_object_id *);
741 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
742 
743 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
744     int);
745 const struct got_error *
746     got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
747 const struct got_error *got_privsep_send_gitconfig_repository_extensions_req(
748     struct imsgbuf *);
749 const struct got_error *got_privsep_send_gitconfig_author_name_req(
750     struct imsgbuf *);
751 const struct got_error *got_privsep_send_gitconfig_author_email_req(
752     struct imsgbuf *);
753 const struct got_error *got_privsep_send_gitconfig_remotes_req(
754     struct imsgbuf *);
755 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
756 const struct got_error *got_privsep_recv_gitconfig_str(char **,
757     struct imsgbuf *);
758 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
759 const struct got_error *got_privsep_recv_gitconfig_remotes(
760     struct got_remote_repo **, int *, struct imsgbuf *);
761 
762 const struct got_error *got_privsep_send_gotconfig_parse_req(struct imsgbuf *,
763     int);
764 const struct got_error *got_privsep_send_gotconfig_author_req(struct imsgbuf *);
765 const struct got_error *got_privsep_send_gotconfig_allowed_signers_req(
766     struct imsgbuf *);
767 const struct got_error *got_privsep_send_gotconfig_revoked_signers_req(
768     struct imsgbuf *);
769 const struct got_error *got_privsep_send_gotconfig_remotes_req(
770     struct imsgbuf *);
771 const struct got_error *got_privsep_recv_gotconfig_str(char **,
772     struct imsgbuf *);
773 const struct got_error *got_privsep_recv_gotconfig_remotes(
774     struct got_remote_repo **, int *, struct imsgbuf *);
775 
776 const struct got_error *got_privsep_send_commit_traversal_request(
777     struct imsgbuf *, struct got_object_id *, int, const char *);
778 const struct got_error *got_privsep_recv_traversed_commits(
779     struct got_commit_object **, struct got_object_id **,
780     struct got_object_id_queue *, struct imsgbuf *);
781 const struct got_error *got_privsep_send_enumerated_tree(size_t *,
782     struct imsgbuf *, struct got_object_id *, const char *,
783     struct got_parsed_tree_entry *, int);
784 const struct got_error *got_privsep_send_object_enumeration_request(
785     struct imsgbuf *);
786 const struct got_error *got_privsep_send_object_enumeration_done(
787     struct imsgbuf *);
788 const struct got_error *got_privsep_send_object_enumeration_incomplete(
789     struct imsgbuf *);
790 const struct got_error *got_privsep_send_enumerated_commit(struct imsgbuf *,
791     struct got_object_id *, time_t);
792 const struct got_error *got_privsep_recv_enumerated_objects(int *,
793     struct imsgbuf *, got_object_enumerate_commit_cb,
794     got_object_enumerate_tree_cb, void *, struct got_repository *);
795 
796 const struct got_error *got_privsep_send_raw_delta_req(struct imsgbuf *, int,
797     struct got_object_id *);
798 const struct got_error *got_privsep_send_raw_delta_outfd(struct imsgbuf *, int);
799 const struct got_error *got_privsep_send_raw_delta(struct imsgbuf *, uint64_t,
800     uint64_t,  off_t, off_t, off_t, off_t, struct got_object_id *);
801 const struct got_error *got_privsep_recv_raw_delta(uint64_t *, uint64_t *,
802     off_t *, off_t *, off_t *, off_t *, struct got_object_id **,
803     struct imsgbuf *);
804 
805 const struct got_error *got_privsep_send_object_idlist(struct imsgbuf *,
806     struct got_object_id **, size_t);
807 const struct got_error *got_privsep_send_object_idlist_done(struct imsgbuf *);
808 const struct got_error *got_privsep_recv_object_idlist(int *,
809     struct got_object_id **, size_t *, struct imsgbuf *);
810 
811 const struct got_error *got_privsep_send_delta_reuse_req(struct imsgbuf *);
812 const struct got_error *got_privsep_send_reused_deltas(struct imsgbuf *,
813     struct got_imsg_reused_delta *, size_t);
814 const struct got_error *got_privsep_send_reused_deltas_done(struct imsgbuf *);
815 const struct got_error *got_privsep_recv_reused_deltas(int *, 
816     struct got_imsg_reused_delta *, size_t *, struct imsgbuf *);
817 
818 const struct got_error *got_privsep_init_commit_painting(struct imsgbuf *);
819 const struct got_error *got_privsep_send_painting_request(struct imsgbuf *,
820     int, struct got_object_id *, intptr_t);
821 typedef const struct got_error *(*got_privsep_recv_painted_commit_cb)(void *,
822     struct got_object_id *, intptr_t);
823 const struct got_error *got_privsep_send_painted_commits(struct imsgbuf *,
824     struct got_object_id_queue *, int *, int, int);
825 const struct got_error *got_privsep_send_painting_commits_done(struct imsgbuf *);
826 const struct got_error *got_privsep_recv_painted_commits(
827     struct got_object_id_queue *, got_privsep_recv_painted_commit_cb, void *,
828     struct imsgbuf *);
829 
830 void got_privsep_exec_child(int[2], const char *, const char *);