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 
149 	/* Message sending file descriptor to a temporary file. */
150 	GOT_IMSG_TMPFD,
151 
152 	/* Messages related to gitconfig files. */
153 	GOT_IMSG_GITCONFIG_PARSE_REQUEST,
154 	GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST,
155 	GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST,
156 	GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST,
157 	GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST,
158 	GOT_IMSG_GITCONFIG_REMOTES_REQUEST,
159 	GOT_IMSG_GITCONFIG_INT_VAL,
160 	GOT_IMSG_GITCONFIG_STR_VAL,
161 	GOT_IMSG_GITCONFIG_REMOTES,
162 	GOT_IMSG_GITCONFIG_REMOTE,
163 	GOT_IMSG_GITCONFIG_OWNER_REQUEST,
164 	GOT_IMSG_GITCONFIG_OWNER,
165 
166 	/* Messages related to gotconfig files. */
167 	GOT_IMSG_GOTCONFIG_PARSE_REQUEST,
168 	GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST,
169 	GOT_IMSG_GOTCONFIG_REMOTES_REQUEST,
170 	GOT_IMSG_GOTCONFIG_INT_VAL,
171 	GOT_IMSG_GOTCONFIG_STR_VAL,
172 	GOT_IMSG_GOTCONFIG_REMOTES,
173 	GOT_IMSG_GOTCONFIG_REMOTE,
174 
175 	/* Raw object access. Uncompress object data but do not parse it. */
176 	GOT_IMSG_RAW_OBJECT_REQUEST,
177 	GOT_IMSG_RAW_OBJECT_OUTFD,
178 	GOT_IMSG_PACKED_RAW_OBJECT_REQUEST,
179 	GOT_IMSG_RAW_OBJECT,
180 
181 	/* Read raw delta data from pack files. */
182 	GOT_IMSG_RAW_DELTA_OUTFD,
183 	GOT_IMSG_RAW_DELTA_REQUEST,
184 	GOT_IMSG_RAW_DELTA,
185 
186 	/* Re-use deltas found in a pack file. */
187 	GOT_IMSG_DELTA_REUSE_REQUEST,
188 	GOT_IMSG_REUSED_DELTAS,
189 	GOT_IMSG_DELTA_REUSE_DONE,
190 
191 	/* Transfer a list of object IDs. */
192 	GOT_IMSG_OBJ_ID_LIST,
193 	GOT_IMSG_OBJ_ID_LIST_DONE,
194 
195 	/* Messages related to patch files. */
196 	GOT_IMSG_PATCH_FILE,
197 	GOT_IMSG_PATCH_HUNK,
198 	GOT_IMSG_PATCH_DONE,
199 	GOT_IMSG_PATCH_LINE,
200 	GOT_IMSG_PATCH,
201 	GOT_IMSG_PATCH_EOF,
202 };
203 
204 /* Structure for GOT_IMSG_ERROR. */
205 struct got_imsg_error {
206 	int code; /* an error code from got_error.h */
207 	int errno_code; /* in case code equals GOT_ERR_ERRNO */
208 } __attribute__((__packed__));
209 
210 /*
211  * Structure for GOT_IMSG_TREE_REQUEST and GOT_IMSG_OBJECT data.
212  */
213 struct got_imsg_object {
214 	uint8_t id[SHA1_DIGEST_LENGTH];
215 
216 	/* These fields are the same as in struct got_object. */
217 	int type;
218 	int flags;
219 	size_t hdrlen;
220 	size_t size;
221 	off_t pack_offset;
222 	int pack_idx;
223 }  __attribute__((__packed__));
224 
225 /* Structure for GOT_IMSG_COMMIT data. */
226 struct got_imsg_commit_object {
227 	uint8_t tree_id[SHA1_DIGEST_LENGTH];
228 	size_t author_len;
229 	time_t author_time;
230 	time_t author_gmtoff;
231 	size_t committer_len;
232 	time_t committer_time;
233 	time_t committer_gmtoff;
234 	size_t logmsg_len;
235 	int nparents;
236 
237 	/*
238 	 * Followed by author_len + committer_len data bytes
239 	 */
240 
241 	/* Followed by 'nparents' SHA1_DIGEST_LENGTH length strings */
242 
243 	/*
244 	 * Followed by 'logmsg_len' bytes of commit log message data in
245 	 * one or more GOT_IMSG_COMMIT_LOGMSG messages.
246 	 */
247 } __attribute__((__packed__));
248 
249 struct got_imsg_tree_entry {
250 	char id[SHA1_DIGEST_LENGTH];
251 	mode_t mode;
252 	size_t namelen;
253 	/* Followed by namelen bytes of entry's name, not NUL-terminated. */
254 } __attribute__((__packed__));
255 
256 /* Structure for GOT_IMSG_TREE_ENTRIES. */
257 struct got_imsg_tree_entries {
258 	size_t nentries; /* Number of tree entries contained in this message. */
259 
260 	/* Followed by nentries * struct got_imsg_tree_entry */
261 };
262 
263 /* Structure for GOT_IMSG_TREE_OBJECT_REPLY data. */
264 struct got_imsg_tree_object {
265 	int nentries; /* This many tree entries follow. */
266 };
267 
268 /* Structure for GOT_IMSG_BLOB. */
269 struct got_imsg_blob {
270 	size_t size;
271 	size_t hdrlen;
272 
273 	/*
274 	 * If size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX, blob data follows
275 	 * in the imsg buffer. Otherwise, blob data has been written to a
276 	 * file descriptor passed via the GOT_IMSG_BLOB_OUTFD imsg.
277 	 */
278 #define GOT_PRIVSEP_INLINE_BLOB_DATA_MAX \
279 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_blob))
280 };
281 
282 /* Structure for GOT_IMSG_RAW_OBJECT. */
283 struct got_imsg_raw_obj {
284 	off_t size;
285 	size_t hdrlen;
286 
287 	/*
288 	 * If size <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX, object data follows
289 	 * in the imsg buffer. Otherwise, object data has been written to a
290 	 * file descriptor passed via the GOT_IMSG_RAW_OBJECT_OUTFD imsg.
291 	 */
292 #define GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX \
293 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_raw_obj))
294 };
295 
296 /* Structure for GOT_IMSG_RAW_DELTA. */
297 struct got_imsg_raw_delta {
298 	uint8_t base_id[SHA1_DIGEST_LENGTH];
299 	uint64_t base_size;
300 	uint64_t result_size;
301 	off_t delta_size;
302 	off_t delta_compressed_size;
303 	off_t delta_offset;
304 	off_t delta_out_offset;
305 
306 	/*
307 	 * Delta data has been written at delta_out_offset to the file
308 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
309 	 */
310 };
311 
312 /* Structures for GOT_IMSG_REUSED_DELTAS. */
313 struct got_imsg_reused_delta {
314 	struct got_object_id id;
315 	struct got_object_id base_id;
316 	uint64_t base_size;
317 	uint64_t result_size;
318 	off_t delta_size;
319 	off_t delta_compressed_size;
320 	off_t delta_offset;
321 	off_t delta_out_offset;
322 
323 	/*
324 	 * Delta data has been written at delta_out_offset to the file
325 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
326 	 */
327 };
328 struct got_imsg_reused_deltas {
329 	size_t ndeltas;
330 
331 	/*
332 	 * Followed by ndeltas * struct got_imsg_reused_delta.
333 	 */
334 
335 #define GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS \
336 	((MAX_IMSGSIZE - IMSG_HEADER_SIZE - \
337 	sizeof(struct got_imsg_reused_deltas)) \
338 	/ sizeof(struct got_imsg_reused_delta))
339 };
340 
341 /* Structure for GOT_IMSG_TAG data. */
342 struct got_imsg_tag_object {
343 	uint8_t id[SHA1_DIGEST_LENGTH];
344 	int obj_type;
345 	size_t tag_len;
346 	size_t tagger_len;
347 	time_t tagger_time;
348 	time_t tagger_gmtoff;
349 	size_t tagmsg_len;
350 
351 	/*
352 	 * Followed by tag_len + tagger_len data bytes
353 	 */
354 
355 	/*
356 	 * Followed by 'tagmsg_len' bytes of tag message data in
357 	 * one or more GOT_IMSG_TAG_TAGMSG messages.
358 	 */
359 } __attribute__((__packed__));
360 
361 /* Structure for GOT_IMSG_FETCH_HAVE_REF data. */
362 struct got_imsg_fetch_have_ref {
363 	uint8_t id[SHA1_DIGEST_LENGTH];
364 	size_t name_len;
365 	/* Followed by name_len data bytes. */
366 } __attribute__((__packed__));
367 
368 /* Structure for GOT_IMSG_FETCH_WANTED_BRANCH data. */
369 struct got_imsg_fetch_wanted_branch {
370 	size_t name_len;
371 	/* Followed by name_len data bytes. */
372 } __attribute__((__packed__));
373 
374 /* Structure for GOT_IMSG_FETCH_WANTED_REF data. */
375 struct got_imsg_fetch_wanted_ref {
376 	size_t name_len;
377 	/* Followed by name_len data bytes. */
378 } __attribute__((__packed__));
379 
380 /* Structure for GOT_IMSG_FETCH_REQUEST data. */
381 struct got_imsg_fetch_request {
382 	int fetch_all_branches;
383 	int list_refs_only;
384 	int verbosity;
385 	size_t n_have_refs;
386 	size_t n_wanted_branches;
387 	size_t n_wanted_refs;
388 	/* Followed by n_have_refs GOT_IMSG_FETCH_HAVE_REF messages. */
389 	/* Followed by n_wanted_branches times GOT_IMSG_FETCH_WANTED_BRANCH. */
390 	/* Followed by n_wanted_refs times GOT_IMSG_FETCH_WANTED_REF. */
391 } __attribute__((__packed__));
392 
393 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
394 struct got_imsg_fetch_symref {
395 	size_t name_len;
396 	size_t target_len;
397 
398 	/*
399 	 * Followed by name_len + target_len data bytes.
400 	 */
401 } __attribute__((__packed__));
402 
403 struct got_imsg_fetch_symrefs {
404 	size_t nsymrefs;
405 
406 	/* Followed by nsymrefs times of got_imsg_fetch_symref data. */
407 } __attribute__((__packed__));
408 
409 /* Structure for GOT_IMSG_FETCH_REF data. */
410 struct got_imsg_fetch_ref {
411 	/* Describes a reference which will be fetched. */
412 	uint8_t refid[SHA1_DIGEST_LENGTH];
413 	/* Followed by reference name in remaining data of imsg buffer. */
414 };
415 
416 /* Structure for GOT_IMSG_FETCH_DOWNLOAD_PROGRESS data. */
417 struct got_imsg_fetch_download_progress {
418 	/* Number of packfile data bytes downloaded so far. */
419 	off_t packfile_bytes;
420 };
421 
422 /* Structure for GOT_IMSG_SEND_REQUEST data. */
423 struct got_imsg_send_request {
424 	int verbosity;
425 	size_t nrefs;
426 	/* Followed by nrefs GOT_IMSG_SEND_REF messages. */
427 } __attribute__((__packed__));
428 
429 /* Structure for GOT_IMSG_SEND_UPLOAD_PROGRESS data. */
430 struct got_imsg_send_upload_progress {
431 	/* Number of packfile data bytes uploaded so far. */
432 	off_t packfile_bytes;
433 };
434 
435 /* Structure for GOT_IMSG_SEND_REF data. */
436 struct got_imsg_send_ref {
437 	uint8_t id[SHA1_DIGEST_LENGTH];
438 	int delete;
439 	size_t name_len;
440 	/* Followed by name_len data bytes. */
441 } __attribute__((__packed__));
442 
443 /* Structure for GOT_IMSG_SEND_REMOTE_REF data. */
444 struct got_imsg_send_remote_ref {
445 	uint8_t id[SHA1_DIGEST_LENGTH];
446 	size_t name_len;
447 	/* Followed by name_len data bytes. */
448 } __attribute__((__packed__));
449 
450 /* Structure for GOT_IMSG_SEND_REF_STATUS data. */
451 struct got_imsg_send_ref_status {
452 	int success;
453 	size_t name_len;
454 	/* Followed by name_len data bytes. */
455 } __attribute__((__packed__));
456 
457 /* Structure for GOT_IMSG_IDXPACK_REQUEST data. */
458 struct got_imsg_index_pack_request {
459 	uint8_t pack_hash[SHA1_DIGEST_LENGTH];
460 } __attribute__((__packed__));
461 
462 /* Structure for GOT_IMSG_IDXPACK_PROGRESS data. */
463 struct got_imsg_index_pack_progress {
464 	/* Total number of objects in pack file. */
465 	int nobj_total;
466 
467 	/* Number of objects indexed so far. */
468 	int nobj_indexed;
469 
470 	/* Number of non-deltified objects in pack file. */
471 	int nobj_loose;
472 
473 	/* Number of deltified objects resolved so far. */
474 	int nobj_resolved;
475 };
476 
477 /* Structure for GOT_IMSG_PACKIDX. */
478 struct got_imsg_packidx {
479 	size_t len;
480 	off_t packfile_size;
481 	/* Additionally, a file desciptor is passed via imsg. */
482 };
483 
484 /* Structure for GOT_IMSG_PACK. */
485 struct got_imsg_pack {
486 	char path_packfile[PATH_MAX];
487 	size_t filesize;
488 	/* Additionally, a file desciptor is passed via imsg. */
489 } __attribute__((__packed__));
490 
491 /*
492  * Structure for GOT_IMSG_OBJECT_REQUEST, GOT_IMSG_BLOB_REQUEST,
493  * GOT_IMSG_TREE_REQUEST, GOT_IMSG_COMMIT_REQUEST, and
494  * GOT_IMSG_TAG_REQUEST data.
495  */
496 struct got_object_id;
497 
498 /*
499  * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST and
500  * GOT_IMSG_PACKED_RAW_OBJECT_REQUEST data.
501  */
502 struct got_imsg_packed_object {
503 	uint8_t id[SHA1_DIGEST_LENGTH];
504 	int idx;
505 } __attribute__((__packed__));
506 
507 /*
508  * Structure for GOT_IMSG_DELTA data.
509  */
510 struct got_imsg_delta {
511 	/* These fields are the same as in struct got_delta. */
512 	off_t offset;
513 	size_t tslen;
514 	int type;
515 	size_t size;
516 	off_t data_offset;
517 };
518 
519 /*
520  * Structure for GOT_IMSG_RAW_DELTA_REQUEST data.
521  */
522 struct got_imsg_raw_delta_request {
523 	uint8_t id[SHA1_DIGEST_LENGTH];
524 	int idx;
525 };
526 
527 /*
528  * Structure for GOT_IMSG_OBJ_ID_LIST data.
529  * Multiple such messages may be sent back-to-back, where each message
530  * contains a chunk of IDs. The entire list must be terminated with a
531  * GOT_IMSG_OBJ_ID_LIST_DONE message.
532  */
533 struct got_imsg_object_idlist {
534 	size_t nids;
535 
536 	/*
537 	 * Followed by nids * struct got_object_id.
538 	 */
539 
540 #define GOT_IMSG_OBJ_ID_LIST_MAX_NIDS \
541 	((MAX_IMSGSIZE - IMSG_HEADER_SIZE - \
542 	sizeof(struct got_imsg_object_idlist)) / sizeof(struct got_object_id))
543 };
544 
545 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST  */
546 struct got_imsg_commit_traversal_request {
547 	uint8_t id[SHA1_DIGEST_LENGTH];
548 	int idx;
549 	size_t path_len;
550 	/* Followed by path_len bytes of path data */
551 } __attribute__((__packed__));
552 
553 /* Structure for GOT_IMSG_TRAVERSED_COMMITS  */
554 struct got_imsg_traversed_commits {
555 	size_t ncommits;
556 	/* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
557 } __attribute__((__packed__));
558 
559 /*
560  * Structure for GOT_IMSG_GOTCONFIG_REMOTE and
561  * GOT_IMSG_GOTCONFIG_REMOTE data.
562  */
563 struct got_imsg_remote {
564 	size_t name_len;
565 	size_t fetch_url_len;
566 	size_t send_url_len;
567 	int mirror_references;
568 	int fetch_all_branches;
569 	int nfetch_branches;
570 	int nsend_branches;
571 	int nfetch_refs;
572 
573 	/* Followed by name_len data bytes. */
574 	/* Followed by fetch_url_len + send_url_len data bytes. */
575 	/* Followed by nfetch_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
576 	/* Followed by nsend_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
577 	/* Followed by nfetch_refs GOT_IMSG_GITCONFIG_STR_VAL messages. */
578 } __attribute__((__packed__));
579 
580 /*
581  * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
582  */
583 struct got_imsg_remotes {
584 	int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
585 };
586 
587 /*
588  * Structure for GOT_IMSG_PATCH data.
589  */
590 struct got_imsg_patch {
591 	int	git;
592 	char	old[PATH_MAX];
593 	char	new[PATH_MAX];
594 };
595 
596 /*
597  * Structure for GOT_IMSG_PATCH_HUNK data.
598  */
599 struct got_imsg_patch_hunk {
600 	long	oldfrom;
601 	long	oldlines;
602 	long	newfrom;
603 	long	newlines;
604 };
605 
606 struct got_remote_repo;
607 struct got_pack;
608 struct got_packidx;
609 struct got_pathlist_head;
610 
611 const struct got_error *got_send_ack(pid_t);
612 const struct got_error *got_privsep_wait_for_child(pid_t);
613 const struct got_error *got_privsep_flush_imsg(struct imsgbuf *);
614 const struct got_error *got_privsep_send_stop(int);
615 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
616     size_t);
617 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
618 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
619 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
620 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int,
621     struct got_object_id *);
622 const struct got_error *got_privsep_send_raw_obj_req(struct imsgbuf *, int,
623     struct got_object_id *);
624 const struct got_error *got_privsep_send_raw_obj_outfd(struct imsgbuf *, int);
625 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
626     struct got_object_id *, int);
627 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
628     struct got_object_id *, int);
629 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
630     struct got_object_id *, int);
631 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
632     struct got_object_id *, int);
633 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
634 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
635 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
636     struct got_object *);
637 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *,
638     uint8_t *, int);
639 const struct got_error *got_privsep_send_index_pack_outfd(struct imsgbuf *,
640     int);
641 const struct got_error *got_privsep_recv_index_progress(int *, int *, int *,
642     int *, int *, struct imsgbuf *ibuf);
643 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int,
644     struct got_pathlist_head *, int, struct got_pathlist_head *,
645     struct got_pathlist_head *, int, int);
646 const struct got_error *got_privsep_send_fetch_outfd(struct imsgbuf *, int);
647 const struct got_error *got_privsep_recv_fetch_progress(int *,
648     struct got_object_id **, char **, struct got_pathlist_head *, char **,
649     off_t *, uint8_t *, struct imsgbuf *);
650 const struct got_error *got_privsep_send_send_req(struct imsgbuf *, int,
651     struct got_pathlist_head *, struct got_pathlist_head *, int);
652 const struct got_error *got_privsep_recv_send_remote_refs(
653     struct got_pathlist_head *, struct imsgbuf *);
654 const struct got_error *got_privsep_send_packfd(struct imsgbuf *, int);
655 const struct got_error *got_privsep_recv_send_progress(int *, off_t *,
656     int *, char **, struct imsgbuf *);
657 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
658     struct imsg *, struct imsgbuf *);
659 const struct got_error *got_privsep_recv_obj(struct got_object **,
660     struct imsgbuf *);
661 const struct got_error *got_privsep_send_raw_obj(struct imsgbuf *, off_t,
662     size_t, uint8_t *);
663 const struct got_error *got_privsep_recv_raw_obj(uint8_t **, off_t *, size_t *,
664     struct imsgbuf *);
665 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
666     struct got_commit_object *);
667 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
668     struct imsgbuf *);
669 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
670     struct imsgbuf *);
671 struct got_parsed_tree_entry;
672 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
673     struct got_parsed_tree_entry *, int);
674 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
675     const uint8_t *);
676 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
677     struct imsgbuf *);
678 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
679     struct got_tag_object *);
680 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
681     struct imsgbuf *);
682 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
683     struct got_pack *, struct got_packidx *);
684 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
685     struct got_object_id *);
686 const struct got_error *got_privsep_send_packed_raw_obj_req(struct imsgbuf *,
687     int, struct got_object_id *);
688 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
689 
690 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
691     int);
692 const struct got_error *
693     got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
694 const struct got_error *got_privsep_send_gitconfig_repository_extensions_req(
695     struct imsgbuf *);
696 const struct got_error *got_privsep_send_gitconfig_author_name_req(
697     struct imsgbuf *);
698 const struct got_error *got_privsep_send_gitconfig_author_email_req(
699     struct imsgbuf *);
700 const struct got_error *got_privsep_send_gitconfig_remotes_req(
701     struct imsgbuf *);
702 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
703 const struct got_error *got_privsep_recv_gitconfig_str(char **,
704     struct imsgbuf *);
705 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
706 const struct got_error *got_privsep_recv_gitconfig_remotes(
707     struct got_remote_repo **, int *, struct imsgbuf *);
708 
709 const struct got_error *got_privsep_send_gotconfig_parse_req(struct imsgbuf *,
710     int);
711 const struct got_error *got_privsep_send_gotconfig_author_req(struct imsgbuf *);
712 const struct got_error *got_privsep_send_gotconfig_remotes_req(
713     struct imsgbuf *);
714 const struct got_error *got_privsep_recv_gotconfig_str(char **,
715     struct imsgbuf *);
716 const struct got_error *got_privsep_recv_gotconfig_remotes(
717     struct got_remote_repo **, int *, struct imsgbuf *);
718 
719 const struct got_error *got_privsep_send_commit_traversal_request(
720     struct imsgbuf *, struct got_object_id *, int, const char *);
721 const struct got_error *got_privsep_recv_traversed_commits(
722     struct got_commit_object **, struct got_object_id **,
723     struct got_object_id_queue *, struct imsgbuf *);
724 
725 const struct got_error *got_privsep_send_raw_delta_req(struct imsgbuf *, int,
726     struct got_object_id *);
727 const struct got_error *got_privsep_send_raw_delta_outfd(struct imsgbuf *, int);
728 const struct got_error *got_privsep_send_raw_delta(struct imsgbuf *, uint64_t,
729     uint64_t,  off_t, off_t, off_t, off_t, struct got_object_id *);
730 const struct got_error *got_privsep_recv_raw_delta(uint64_t *, uint64_t *,
731     off_t *, off_t *, off_t *, off_t *, struct got_object_id **,
732     struct imsgbuf *);
733 
734 const struct got_error *got_privsep_send_object_idlist(struct imsgbuf *,
735     struct got_object_id **, size_t);
736 const struct got_error *got_privsep_send_object_idlist_done(struct imsgbuf *);
737 const struct got_error *got_privsep_recv_object_idlist(int *,
738     struct got_object_id **, size_t *, struct imsgbuf *);
739 
740 const struct got_error *got_privsep_send_delta_reuse_req(struct imsgbuf *);
741 const struct got_error *got_privsep_send_reused_deltas(struct imsgbuf *,
742     struct got_imsg_reused_delta *, size_t);
743 const struct got_error *got_privsep_send_reused_deltas_done(struct imsgbuf *);
744 const struct got_error *got_privsep_recv_reused_deltas(int *, 
745     struct got_imsg_reused_delta *, size_t *, struct imsgbuf *);
746 
747 void got_privsep_exec_child(int[2], const char *, const char *);