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gotd.conf: free STRINGS in all code paths
[got-portable.git] / gotd / session.c
blob22c03b9ec660bcf589b5ba045f5c6e3d68a9b5eb
1 /*
2 * Copyright (c) 2022, 2023 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/types.h>
18 #include <sys/queue.h>
19 #include <sys/socket.h>
20 #include <sys/stat.h>
21 #include <sys/uio.h>
22
23 #include <errno.h>
24 #include <event.h>
25 #include <limits.h>
26 #include <signal.h>
27 #include <stdint.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <imsg.h>
32 #include <unistd.h>
33
34 #include "got_error.h"
35 #include "got_repository.h"
36 #include "got_object.h"
37 #include "got_path.h"
38 #include "got_reference.h"
39 #include "got_opentemp.h"
40
41 #include "got_lib_hash.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_object.h"
44 #include "got_lib_object_cache.h"
45 #include "got_lib_pack.h"
46 #include "got_lib_repository.h"
47 #include "got_lib_gitproto.h"
48
49 #include "gotd.h"
50 #include "log.h"
51 #include "session.h"
52
53
54 static struct gotd_session {
55 pid_t pid;
56 const char *title;
57 struct got_repository *repo;
58 int *pack_fds;
59 int *temp_fds;
60 struct gotd_imsgev parent_iev;
61 struct timeval request_timeout;
62 } gotd_session;
63
64 static struct gotd_session_client {
65 enum gotd_session_state state;
66 int is_writing;
67 struct gotd_client_capability *capabilities;
68 size_t ncapa_alloc;
69 size_t ncapabilities;
70 uint32_t id;
71 int fd;
72 int delta_cache_fd;
73 struct gotd_imsgev iev;
74 struct gotd_imsgev repo_child_iev;
75 struct event tmo;
76 uid_t euid;
77 gid_t egid;
78 char *packfile_path;
79 char *packidx_path;
80 int nref_updates;
81 int accept_flush_pkt;
82 } gotd_session_client;
83
84 void gotd_session_sighdlr(int sig, short event, void *arg);
85 static void gotd_session_shutdown(void);
86
87 static void
88 disconnect(struct gotd_session_client *client)
89 {
90 log_debug("uid %d: disconnecting", client->euid);
91
92 if (gotd_imsg_compose_event(&gotd_session.parent_iev,
93 GOTD_IMSG_DISCONNECT, PROC_SESSION, -1, NULL, 0) == -1)
94 log_warn("imsg compose DISCONNECT");
95
96 imsg_clear(&client->repo_child_iev.ibuf);
97 event_del(&client->repo_child_iev.ev);
98 evtimer_del(&client->tmo);
99 close(client->fd);
100 if (client->delta_cache_fd != -1)
101 close(client->delta_cache_fd);
102 if (client->packfile_path) {
103 if (unlink(client->packfile_path) == -1 && errno != ENOENT)
104 log_warn("unlink %s: ", client->packfile_path);
105 free(client->packfile_path);
106 }
107 if (client->packidx_path) {
108 if (unlink(client->packidx_path) == -1 && errno != ENOENT)
109 log_warn("unlink %s: ", client->packidx_path);
110 free(client->packidx_path);
111 }
112 free(client->capabilities);
113
114 gotd_session_shutdown();
115 }
116
117 static void
118 disconnect_on_error(struct gotd_session_client *client,
119 const struct got_error *err)
120 {
121 struct imsgbuf ibuf;
122
123 log_warnx("uid %d: %s", client->euid, err->msg);
124 if (err->code != GOT_ERR_EOF) {
125 imsg_init(&ibuf, client->fd);
126 gotd_imsg_send_error(&ibuf, 0, PROC_SESSION, err);
127 imsg_clear(&ibuf);
128 }
129
130 disconnect(client);
131 }
132
133 static void
134 gotd_request_timeout(int fd, short events, void *arg)
135 {
136 struct gotd_session_client *client = arg;
137
138 log_debug("disconnecting uid %d due to timeout", client->euid);
139 disconnect(client);
140 }
141
142 void
143 gotd_session_sighdlr(int sig, short event, void *arg)
144 {
145 /*
146 * Normal signal handler rules don't apply because libevent
147 * decouples for us.
148 */
149
150 switch (sig) {
151 case SIGHUP:
152 log_info("%s: ignoring SIGHUP", __func__);
153 break;
154 case SIGUSR1:
155 log_info("%s: ignoring SIGUSR1", __func__);
156 break;
157 case SIGTERM:
158 case SIGINT:
159 gotd_session_shutdown();
160 /* NOTREACHED */
161 break;
162 default:
163 fatalx("unexpected signal");
164 }
165 }
166
167 static const struct got_error *
168 recv_packfile_done(uint32_t *client_id, struct imsg *imsg)
169 {
170 struct gotd_imsg_packfile_done idone;
171 size_t datalen;
172
173 log_debug("packfile-done received");
174
175 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
176 if (datalen != sizeof(idone))
177 return got_error(GOT_ERR_PRIVSEP_LEN);
178 memcpy(&idone, imsg->data, sizeof(idone));
179
180 *client_id = idone.client_id;
181 return NULL;
182 }
183
184 static const struct got_error *
185 recv_packfile_install(uint32_t *client_id, struct imsg *imsg)
186 {
187 struct gotd_imsg_packfile_install inst;
188 size_t datalen;
189
190 log_debug("packfile-install received");
191
192 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
193 if (datalen != sizeof(inst))
194 return got_error(GOT_ERR_PRIVSEP_LEN);
195 memcpy(&inst, imsg->data, sizeof(inst));
196
197 *client_id = inst.client_id;
198 return NULL;
199 }
200
201 static const struct got_error *
202 recv_ref_updates_start(uint32_t *client_id, struct imsg *imsg)
203 {
204 struct gotd_imsg_ref_updates_start istart;
205 size_t datalen;
206
207 log_debug("ref-updates-start received");
208
209 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
210 if (datalen != sizeof(istart))
211 return got_error(GOT_ERR_PRIVSEP_LEN);
212 memcpy(&istart, imsg->data, sizeof(istart));
213
214 *client_id = istart.client_id;
215 return NULL;
216 }
217
218 static const struct got_error *
219 recv_ref_update(uint32_t *client_id, struct imsg *imsg)
220 {
221 struct gotd_imsg_ref_update iref;
222 size_t datalen;
223
224 log_debug("ref-update received");
225
226 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
227 if (datalen < sizeof(iref))
228 return got_error(GOT_ERR_PRIVSEP_LEN);
229 memcpy(&iref, imsg->data, sizeof(iref));
230
231 *client_id = iref.client_id;
232 return NULL;
233 }
234
235 static const struct got_error *
236 send_ref_update_ok(struct gotd_session_client *client,
237 struct gotd_imsg_ref_update *iref, const char *refname)
238 {
239 struct gotd_imsg_ref_update_ok iok;
240 struct gotd_imsgev *iev = &client->iev;
241 struct ibuf *wbuf;
242 size_t len;
243
244 memset(&iok, 0, sizeof(iok));
245 iok.client_id = client->id;
246 memcpy(iok.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
247 memcpy(iok.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
248 iok.name_len = strlen(refname);
249
250 len = sizeof(iok) + iok.name_len;
251 wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_REF_UPDATE_OK,
252 PROC_SESSION, gotd_session.pid, len);
253 if (wbuf == NULL)
254 return got_error_from_errno("imsg_create REF_UPDATE_OK");
255
256 if (imsg_add(wbuf, &iok, sizeof(iok)) == -1)
257 return got_error_from_errno("imsg_add REF_UPDATE_OK");
258 if (imsg_add(wbuf, refname, iok.name_len) == -1)
259 return got_error_from_errno("imsg_add REF_UPDATE_OK");
260
261 wbuf->fd = -1;
262 imsg_close(&iev->ibuf, wbuf);
263 gotd_imsg_event_add(iev);
264 return NULL;
265 }
266
267 static void
268 send_refs_updated(struct gotd_session_client *client)
269 {
270 if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_REFS_UPDATED,
271 PROC_SESSION, -1, NULL, 0) == -1)
272 log_warn("imsg compose REFS_UPDATED");
273 }
274
275 static const struct got_error *
276 send_ref_update_ng(struct gotd_session_client *client,
277 struct gotd_imsg_ref_update *iref, const char *refname,
278 const char *reason)
279 {
280 const struct got_error *ng_err;
281 struct gotd_imsg_ref_update_ng ing;
282 struct gotd_imsgev *iev = &client->iev;
283 struct ibuf *wbuf;
284 size_t len;
285
286 memset(&ing, 0, sizeof(ing));
287 ing.client_id = client->id;
288 memcpy(ing.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
289 memcpy(ing.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
290 ing.name_len = strlen(refname);
291
292 ng_err = got_error_fmt(GOT_ERR_REF_BUSY, "%s", reason);
293 ing.reason_len = strlen(ng_err->msg);
294
295 len = sizeof(ing) + ing.name_len + ing.reason_len;
296 wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_REF_UPDATE_NG,
297 PROC_SESSION, gotd_session.pid, len);
298 if (wbuf == NULL)
299 return got_error_from_errno("imsg_create REF_UPDATE_NG");
300
301 if (imsg_add(wbuf, &ing, sizeof(ing)) == -1)
302 return got_error_from_errno("imsg_add REF_UPDATE_NG");
303 if (imsg_add(wbuf, refname, ing.name_len) == -1)
304 return got_error_from_errno("imsg_add REF_UPDATE_NG");
305 if (imsg_add(wbuf, ng_err->msg, ing.reason_len) == -1)
306 return got_error_from_errno("imsg_add REF_UPDATE_NG");
307
308 wbuf->fd = -1;
309 imsg_close(&iev->ibuf, wbuf);
310 gotd_imsg_event_add(iev);
311 return NULL;
312 }
313
314 static const struct got_error *
315 install_pack(struct gotd_session_client *client, const char *repo_path,
316 struct imsg *imsg)
317 {
318 const struct got_error *err = NULL;
319 struct gotd_imsg_packfile_install inst;
320 char hex[SHA1_DIGEST_STRING_LENGTH];
321 size_t datalen;
322 char *packfile_path = NULL, *packidx_path = NULL;
323
324 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
325 if (datalen != sizeof(inst))
326 return got_error(GOT_ERR_PRIVSEP_LEN);
327 memcpy(&inst, imsg->data, sizeof(inst));
328
329 if (client->packfile_path == NULL)
330 return got_error_msg(GOT_ERR_BAD_REQUEST,
331 "client has no pack file");
332 if (client->packidx_path == NULL)
333 return got_error_msg(GOT_ERR_BAD_REQUEST,
334 "client has no pack file index");
335
336 if (got_sha1_digest_to_str(inst.pack_sha1, hex, sizeof(hex)) == NULL)
337 return got_error_msg(GOT_ERR_NO_SPACE,
338 "could not convert pack file SHA1 to hex");
339
340 if (asprintf(&packfile_path, "/%s/%s/pack-%s.pack",
341 repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
342 err = got_error_from_errno("asprintf");
343 goto done;
344 }
345
346 if (asprintf(&packidx_path, "/%s/%s/pack-%s.idx",
347 repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
348 err = got_error_from_errno("asprintf");
349 goto done;
350 }
351
352 if (rename(client->packfile_path, packfile_path) == -1) {
353 err = got_error_from_errno3("rename", client->packfile_path,
354 packfile_path);
355 goto done;
356 }
357
358 free(client->packfile_path);
359 client->packfile_path = NULL;
360
361 if (rename(client->packidx_path, packidx_path) == -1) {
362 err = got_error_from_errno3("rename", client->packidx_path,
363 packidx_path);
364 goto done;
365 }
366
367 free(client->packidx_path);
368 client->packidx_path = NULL;
369 done:
370 free(packfile_path);
371 free(packidx_path);
372 return err;
373 }
374
375 static const struct got_error *
376 begin_ref_updates(struct gotd_session_client *client, struct imsg *imsg)
377 {
378 struct gotd_imsg_ref_updates_start istart;
379 size_t datalen;
380
381 if (client->nref_updates != -1)
382 return got_error(GOT_ERR_PRIVSEP_MSG);
383
384 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
385 if (datalen != sizeof(istart))
386 return got_error(GOT_ERR_PRIVSEP_LEN);
387 memcpy(&istart, imsg->data, sizeof(istart));
388
389 if (istart.nref_updates <= 0)
390 return got_error(GOT_ERR_PRIVSEP_MSG);
391
392 client->nref_updates = istart.nref_updates;
393 return NULL;
394 }
395
396 static const struct got_error *
397 update_ref(int *shut, struct gotd_session_client *client,
398 const char *repo_path, struct imsg *imsg)
399 {
400 const struct got_error *err = NULL;
401 struct got_repository *repo = NULL;
402 struct got_reference *ref = NULL;
403 struct gotd_imsg_ref_update iref;
404 struct got_object_id old_id, new_id;
405 struct got_object_id *id = NULL;
406 struct got_object *obj = NULL;
407 char *refname = NULL;
408 size_t datalen;
409 int locked = 0;
410
411 log_debug("update-ref from uid %d", client->euid);
412
413 if (client->nref_updates <= 0)
414 return got_error(GOT_ERR_PRIVSEP_MSG);
415
416 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
417 if (datalen < sizeof(iref))
418 return got_error(GOT_ERR_PRIVSEP_LEN);
419 memcpy(&iref, imsg->data, sizeof(iref));
420 if (datalen != sizeof(iref) + iref.name_len)
421 return got_error(GOT_ERR_PRIVSEP_LEN);
422 refname = strndup(imsg->data + sizeof(iref), iref.name_len);
423 if (refname == NULL)
424 return got_error_from_errno("strndup");
425
426 log_debug("updating ref %s for uid %d", refname, client->euid);
427
428 err = got_repo_open(&repo, repo_path, NULL, NULL);
429 if (err)
430 goto done;
431
432 memcpy(old_id.sha1, iref.old_id, SHA1_DIGEST_LENGTH);
433 memcpy(new_id.sha1, iref.new_id, SHA1_DIGEST_LENGTH);
434 err = got_object_open(&obj, repo,
435 iref.delete_ref ? &old_id : &new_id);
436 if (err)
437 goto done;
438
439 if (iref.ref_is_new) {
440 err = got_ref_open(&ref, repo, refname, 0);
441 if (err) {
442 if (err->code != GOT_ERR_NOT_REF)
443 goto done;
444 err = got_ref_alloc(&ref, refname, &new_id);
445 if (err)
446 goto done;
447 err = got_ref_write(ref, repo); /* will lock/unlock */
448 if (err)
449 goto done;
450 } else {
451 err = got_error_fmt(GOT_ERR_REF_BUSY,
452 "%s has been created by someone else "
453 "while transaction was in progress",
454 got_ref_get_name(ref));
455 goto done;
456 }
457 } else if (iref.delete_ref) {
458 err = got_ref_open(&ref, repo, refname, 1 /* lock */);
459 if (err)
460 goto done;
461 locked = 1;
462
463 err = got_ref_resolve(&id, repo, ref);
464 if (err)
465 goto done;
466
467 if (got_object_id_cmp(id, &old_id) != 0) {
468 err = got_error_fmt(GOT_ERR_REF_BUSY,
469 "%s has been modified by someone else "
470 "while transaction was in progress",
471 got_ref_get_name(ref));
472 goto done;
473 }
474
475 err = got_ref_delete(ref, repo);
476 if (err)
477 goto done;
478
479 free(id);
480 id = NULL;
481 } else {
482 err = got_ref_open(&ref, repo, refname, 1 /* lock */);
483 if (err)
484 goto done;
485 locked = 1;
486
487 err = got_ref_resolve(&id, repo, ref);
488 if (err)
489 goto done;
490
491 if (got_object_id_cmp(id, &old_id) != 0) {
492 err = got_error_fmt(GOT_ERR_REF_BUSY,
493 "%s has been modified by someone else "
494 "while transaction was in progress",
495 got_ref_get_name(ref));
496 goto done;
497 }
498
499 err = got_ref_change_ref(ref, &new_id);
500 if (err)
501 goto done;
502
503 err = got_ref_write(ref, repo);
504 if (err)
505 goto done;
506
507 free(id);
508 id = NULL;
509 }
510 done:
511 if (err) {
512 if (err->code == GOT_ERR_LOCKFILE_TIMEOUT) {
513 err = got_error_fmt(GOT_ERR_LOCKFILE_TIMEOUT,
514 "could not acquire exclusive file lock for %s",
515 refname);
516 }
517 send_ref_update_ng(client, &iref, refname, err->msg);
518 } else
519 send_ref_update_ok(client, &iref, refname);
520
521 if (client->nref_updates > 0) {
522 client->nref_updates--;
523 if (client->nref_updates == 0) {
524 send_refs_updated(client);
525 *shut = 1;
526 }
527
528 }
529 if (locked) {
530 const struct got_error *unlock_err;
531 unlock_err = got_ref_unlock(ref);
532 if (unlock_err && err == NULL)
533 err = unlock_err;
534 }
535 if (ref)
536 got_ref_close(ref);
537 if (obj)
538 got_object_close(obj);
539 if (repo)
540 got_repo_close(repo);
541 free(refname);
542 free(id);
543 return err;
544 }
545
546 static void
547 session_dispatch_repo_child(int fd, short event, void *arg)
548 {
549 struct gotd_imsgev *iev = arg;
550 struct imsgbuf *ibuf = &iev->ibuf;
551 struct gotd_session_client *client = &gotd_session_client;
552 ssize_t n;
553 int shut = 0;
554 struct imsg imsg;
555
556 if (event & EV_READ) {
557 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
558 fatal("imsg_read error");
559 if (n == 0) {
560 /* Connection closed. */
561 shut = 1;
562 goto done;
563 }
564 }
565
566 if (event & EV_WRITE) {
567 n = msgbuf_write(&ibuf->w);
568 if (n == -1 && errno != EAGAIN)
569 fatal("msgbuf_write");
570 if (n == 0) {
571 /* Connection closed. */
572 shut = 1;
573 goto done;
574 }
575 }
576
577 for (;;) {
578 const struct got_error *err = NULL;
579 uint32_t client_id = 0;
580 int do_disconnect = 0;
581 int do_ref_updates = 0, do_ref_update = 0;
582 int do_packfile_install = 0;
583
584 if ((n = imsg_get(ibuf, &imsg)) == -1)
585 fatal("%s: imsg_get error", __func__);
586 if (n == 0) /* No more messages. */
587 break;
588
589 switch (imsg.hdr.type) {
590 case GOTD_IMSG_ERROR:
591 do_disconnect = 1;
592 err = gotd_imsg_recv_error(&client_id, &imsg);
593 break;
594 case GOTD_IMSG_PACKFILE_DONE:
595 do_disconnect = 1;
596 err = recv_packfile_done(&client_id, &imsg);
597 break;
598 case GOTD_IMSG_PACKFILE_INSTALL:
599 err = recv_packfile_install(&client_id, &imsg);
600 if (err == NULL)
601 do_packfile_install = 1;
602 break;
603 case GOTD_IMSG_REF_UPDATES_START:
604 err = recv_ref_updates_start(&client_id, &imsg);
605 if (err == NULL)
606 do_ref_updates = 1;
607 break;
608 case GOTD_IMSG_REF_UPDATE:
609 err = recv_ref_update(&client_id, &imsg);
610 if (err == NULL)
611 do_ref_update = 1;
612 break;
613 default:
614 log_debug("unexpected imsg %d", imsg.hdr.type);
615 break;
616 }
617
618 if (do_disconnect) {
619 if (err)
620 disconnect_on_error(client, err);
621 else
622 disconnect(client);
623 } else {
624 if (do_packfile_install)
625 err = install_pack(client,
626 gotd_session.repo->path, &imsg);
627 else if (do_ref_updates)
628 err = begin_ref_updates(client, &imsg);
629 else if (do_ref_update)
630 err = update_ref(&shut, client,
631 gotd_session.repo->path, &imsg);
632 if (err)
633 log_warnx("uid %d: %s", client->euid, err->msg);
634 }
635 imsg_free(&imsg);
636 }
637 done:
638 if (!shut) {
639 gotd_imsg_event_add(iev);
640 } else {
641 /* This pipe is dead. Remove its event handler */
642 event_del(&iev->ev);
643 event_loopexit(NULL);
644 }
645 }
646
647 static const struct got_error *
648 recv_capabilities(struct gotd_session_client *client, struct imsg *imsg)
649 {
650 struct gotd_imsg_capabilities icapas;
651 size_t datalen;
652
653 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
654 if (datalen != sizeof(icapas))
655 return got_error(GOT_ERR_PRIVSEP_LEN);
656 memcpy(&icapas, imsg->data, sizeof(icapas));
657
658 client->ncapa_alloc = icapas.ncapabilities;
659 client->capabilities = calloc(client->ncapa_alloc,
660 sizeof(*client->capabilities));
661 if (client->capabilities == NULL) {
662 client->ncapa_alloc = 0;
663 return got_error_from_errno("calloc");
664 }
665
666 log_debug("expecting %zu capabilities from uid %d",
667 client->ncapa_alloc, client->euid);
668 return NULL;
669 }
670
671 static const struct got_error *
672 recv_capability(struct gotd_session_client *client, struct imsg *imsg)
673 {
674 struct gotd_imsg_capability icapa;
675 struct gotd_client_capability *capa;
676 size_t datalen;
677 char *key, *value = NULL;
678
679 if (client->capabilities == NULL ||
680 client->ncapabilities >= client->ncapa_alloc) {
681 return got_error_msg(GOT_ERR_BAD_REQUEST,
682 "unexpected capability received");
683 }
684
685 memset(&icapa, 0, sizeof(icapa));
686
687 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
688 if (datalen < sizeof(icapa))
689 return got_error(GOT_ERR_PRIVSEP_LEN);
690 memcpy(&icapa, imsg->data, sizeof(icapa));
691
692 if (datalen != sizeof(icapa) + icapa.key_len + icapa.value_len)
693 return got_error(GOT_ERR_PRIVSEP_LEN);
694
695 key = strndup(imsg->data + sizeof(icapa), icapa.key_len);
696 if (key == NULL)
697 return got_error_from_errno("strndup");
698 if (icapa.value_len > 0) {
699 value = strndup(imsg->data + sizeof(icapa) + icapa.key_len,
700 icapa.value_len);
701 if (value == NULL) {
702 free(key);
703 return got_error_from_errno("strndup");
704 }
705 }
706
707 capa = &client->capabilities[client->ncapabilities++];
708 capa->key = key;
709 capa->value = value;
710
711 if (value)
712 log_debug("uid %d: capability %s=%s", client->euid, key, value);
713 else
714 log_debug("uid %d: capability %s", client->euid, key);
715
716 return NULL;
717 }
718
719 static const struct got_error *
720 ensure_client_is_reading(struct gotd_session_client *client)
721 {
722 if (client->is_writing) {
723 return got_error_fmt(GOT_ERR_BAD_PACKET,
724 "uid %d made a read-request but is not reading from "
725 "a repository", client->euid);
726 }
727
728 return NULL;
729 }
730
731 static const struct got_error *
732 ensure_client_is_writing(struct gotd_session_client *client)
733 {
734 if (!client->is_writing) {
735 return got_error_fmt(GOT_ERR_BAD_PACKET,
736 "uid %d made a write-request but is not writing to "
737 "a repository", client->euid);
738 }
739
740 return NULL;
741 }
742
743 static const struct got_error *
744 forward_want(struct gotd_session_client *client, struct imsg *imsg)
745 {
746 struct gotd_imsg_want ireq;
747 struct gotd_imsg_want iwant;
748 size_t datalen;
749
750 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
751 if (datalen != sizeof(ireq))
752 return got_error(GOT_ERR_PRIVSEP_LEN);
753
754 memcpy(&ireq, imsg->data, datalen);
755
756 memset(&iwant, 0, sizeof(iwant));
757 memcpy(iwant.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
758 iwant.client_id = client->id;
759
760 if (gotd_imsg_compose_event(&client->repo_child_iev, GOTD_IMSG_WANT,
761 PROC_SESSION, -1, &iwant, sizeof(iwant)) == -1)
762 return got_error_from_errno("imsg compose WANT");
763
764 return NULL;
765 }
766
767 static const struct got_error *
768 forward_ref_update(struct gotd_session_client *client, struct imsg *imsg)
769 {
770 const struct got_error *err = NULL;
771 struct gotd_imsg_ref_update ireq;
772 struct gotd_imsg_ref_update *iref = NULL;
773 size_t datalen;
774
775 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
776 if (datalen < sizeof(ireq))
777 return got_error(GOT_ERR_PRIVSEP_LEN);
778 memcpy(&ireq, imsg->data, sizeof(ireq));
779 if (datalen != sizeof(ireq) + ireq.name_len)
780 return got_error(GOT_ERR_PRIVSEP_LEN);
781
782 iref = malloc(datalen);
783 if (iref == NULL)
784 return got_error_from_errno("malloc");
785 memcpy(iref, imsg->data, datalen);
786
787 iref->client_id = client->id;
788 if (gotd_imsg_compose_event(&client->repo_child_iev,
789 GOTD_IMSG_REF_UPDATE, PROC_SESSION, -1, iref, datalen) == -1)
790 err = got_error_from_errno("imsg compose REF_UPDATE");
791 free(iref);
792 return err;
793 }
794
795 static const struct got_error *
796 forward_have(struct gotd_session_client *client, struct imsg *imsg)
797 {
798 struct gotd_imsg_have ireq;
799 struct gotd_imsg_have ihave;
800 size_t datalen;
801
802 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
803 if (datalen != sizeof(ireq))
804 return got_error(GOT_ERR_PRIVSEP_LEN);
805
806 memcpy(&ireq, imsg->data, datalen);
807
808 memset(&ihave, 0, sizeof(ihave));
809 memcpy(ihave.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
810 ihave.client_id = client->id;
811
812 if (gotd_imsg_compose_event(&client->repo_child_iev, GOTD_IMSG_HAVE,
813 PROC_SESSION, -1, &ihave, sizeof(ihave)) == -1)
814 return got_error_from_errno("imsg compose HAVE");
815
816 return NULL;
817 }
818
819 static int
820 client_has_capability(struct gotd_session_client *client, const char *capastr)
821 {
822 struct gotd_client_capability *capa;
823 size_t i;
824
825 if (client->ncapabilities == 0)
826 return 0;
827
828 for (i = 0; i < client->ncapabilities; i++) {
829 capa = &client->capabilities[i];
830 if (strcmp(capa->key, capastr) == 0)
831 return 1;
832 }
833
834 return 0;
835 }
836
837 static const struct got_error *
838 recv_packfile(struct gotd_session_client *client)
839 {
840 const struct got_error *err = NULL;
841 struct gotd_imsg_recv_packfile ipack;
842 struct gotd_imsg_packfile_pipe ipipe;
843 struct gotd_imsg_packidx_file ifile;
844 char *basepath = NULL, *pack_path = NULL, *idx_path = NULL;
845 int packfd = -1, idxfd = -1;
846 int pipe[2] = { -1, -1 };
847
848 if (client->packfile_path) {
849 return got_error_fmt(GOT_ERR_PRIVSEP_MSG,
850 "uid %d already has a pack file", client->euid);
851 }
852
853 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
854 return got_error_from_errno("socketpair");
855
856 memset(&ipipe, 0, sizeof(ipipe));
857 ipipe.client_id = client->id;
858
859 /* Send pack pipe end 0 to repo child process. */
860 if (gotd_imsg_compose_event(&client->repo_child_iev,
861 GOTD_IMSG_PACKFILE_PIPE, PROC_SESSION, pipe[0],
862 &ipipe, sizeof(ipipe)) == -1) {
863 err = got_error_from_errno("imsg compose PACKFILE_PIPE");
864 pipe[0] = -1;
865 goto done;
866 }
867 pipe[0] = -1;
868
869 /* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
870 if (gotd_imsg_compose_event(&client->iev,
871 GOTD_IMSG_PACKFILE_PIPE, PROC_SESSION, pipe[1], NULL, 0) == -1)
872 err = got_error_from_errno("imsg compose PACKFILE_PIPE");
873 pipe[1] = -1;
874
875 if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.pack",
876 got_repo_get_path(gotd_session.repo), GOT_OBJECTS_PACK_DIR,
877 client->euid) == -1) {
878 err = got_error_from_errno("asprintf");
879 goto done;
880 }
881
882 err = got_opentemp_named_fd(&pack_path, &packfd, basepath, "");
883 if (err)
884 goto done;
885 if (fchmod(packfd, GOT_DEFAULT_PACK_MODE) == -1) {
886 err = got_error_from_errno2("fchmod", pack_path);
887 goto done;
888 }
889
890 free(basepath);
891 if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.idx",
892 got_repo_get_path(gotd_session.repo), GOT_OBJECTS_PACK_DIR,
893 client->euid) == -1) {
894 err = got_error_from_errno("asprintf");
895 basepath = NULL;
896 goto done;
897 }
898 err = got_opentemp_named_fd(&idx_path, &idxfd, basepath, "");
899 if (err)
900 goto done;
901 if (fchmod(idxfd, GOT_DEFAULT_PACK_MODE) == -1) {
902 err = got_error_from_errno2("fchmod", idx_path);
903 goto done;
904 }
905
906 memset(&ifile, 0, sizeof(ifile));
907 ifile.client_id = client->id;
908 if (gotd_imsg_compose_event(&client->repo_child_iev,
909 GOTD_IMSG_PACKIDX_FILE, PROC_SESSION,
910 idxfd, &ifile, sizeof(ifile)) == -1) {
911 err = got_error_from_errno("imsg compose PACKIDX_FILE");
912 idxfd = -1;
913 goto done;
914 }
915 idxfd = -1;
916
917 memset(&ipack, 0, sizeof(ipack));
918 ipack.client_id = client->id;
919 if (client_has_capability(client, GOT_CAPA_REPORT_STATUS))
920 ipack.report_status = 1;
921
922 if (gotd_imsg_compose_event(&client->repo_child_iev,
923 GOTD_IMSG_RECV_PACKFILE, PROC_SESSION, packfd,
924 &ipack, sizeof(ipack)) == -1) {
925 err = got_error_from_errno("imsg compose RECV_PACKFILE");
926 packfd = -1;
927 goto done;
928 }
929 packfd = -1;
930
931 done:
932 free(basepath);
933 if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
934 err = got_error_from_errno("close");
935 if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
936 err = got_error_from_errno("close");
937 if (packfd != -1 && close(packfd) == -1 && err == NULL)
938 err = got_error_from_errno("close");
939 if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
940 err = got_error_from_errno("close");
941 if (err) {
942 free(pack_path);
943 free(idx_path);
944 } else {
945 client->packfile_path = pack_path;
946 client->packidx_path = idx_path;
947 }
948 return err;
949 }
950
951 static const struct got_error *
952 send_packfile(struct gotd_session_client *client)
953 {
954 const struct got_error *err = NULL;
955 struct gotd_imsg_send_packfile ipack;
956 struct gotd_imsg_packfile_pipe ipipe;
957 int pipe[2];
958
959 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
960 return got_error_from_errno("socketpair");
961
962 memset(&ipack, 0, sizeof(ipack));
963 memset(&ipipe, 0, sizeof(ipipe));
964
965 ipack.client_id = client->id;
966 if (client_has_capability(client, GOT_CAPA_SIDE_BAND_64K))
967 ipack.report_progress = 1;
968
969 client->delta_cache_fd = got_opentempfd();
970 if (client->delta_cache_fd == -1)
971 return got_error_from_errno("got_opentempfd");
972
973 if (gotd_imsg_compose_event(&client->repo_child_iev,
974 GOTD_IMSG_SEND_PACKFILE, PROC_GOTD, client->delta_cache_fd,
975 &ipack, sizeof(ipack)) == -1) {
976 err = got_error_from_errno("imsg compose SEND_PACKFILE");
977 close(pipe[0]);
978 close(pipe[1]);
979 return err;
980 }
981
982 ipipe.client_id = client->id;
983
984 /* Send pack pipe end 0 to repo child process. */
985 if (gotd_imsg_compose_event(&client->repo_child_iev,
986 GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD,
987 pipe[0], &ipipe, sizeof(ipipe)) == -1) {
988 err = got_error_from_errno("imsg compose PACKFILE_PIPE");
989 close(pipe[1]);
990 return err;
991 }
992
993 /* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
994 if (gotd_imsg_compose_event(&client->iev,
995 GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
996 err = got_error_from_errno("imsg compose PACKFILE_PIPE");
997
998 return err;
999 }
1000
1001 static void
1002 session_dispatch_client(int fd, short events, void *arg)
1003 {
1004 struct gotd_imsgev *iev = arg;
1005 struct imsgbuf *ibuf = &iev->ibuf;
1006 struct gotd_session_client *client = &gotd_session_client;
1007 const struct got_error *err = NULL;
1008 struct imsg imsg;
1009 ssize_t n;
1010
1011 if (events & EV_WRITE) {
1012 while (ibuf->w.queued) {
1013 n = msgbuf_write(&ibuf->w);
1014 if (n == -1 && errno == EPIPE) {
1015 /*
1016 * The client has closed its socket.
1017 * This can happen when Git clients are
1018 * done sending pack file data.
1019 */
1020 msgbuf_clear(&ibuf->w);
1021 continue;
1022 } else if (n == -1 && errno != EAGAIN) {
1023 err = got_error_from_errno("imsg_flush");
1024 disconnect_on_error(client, err);
1025 return;
1026 }
1027 if (n == 0) {
1028 /* Connection closed. */
1029 err = got_error(GOT_ERR_EOF);
1030 disconnect_on_error(client, err);
1031 return;
1032 }
1033 }
1034 }
1035
1036 if ((events & EV_READ) == 0)
1037 return;
1038
1039 memset(&imsg, 0, sizeof(imsg));
1040
1041 while (err == NULL) {
1042 err = gotd_imsg_recv(&imsg, ibuf, 0);
1043 if (err) {
1044 if (err->code == GOT_ERR_PRIVSEP_READ)
1045 err = NULL;
1046 break;
1047 }
1048
1049 evtimer_del(&client->tmo);
1050
1051 switch (imsg.hdr.type) {
1052 case GOTD_IMSG_CAPABILITIES:
1053 if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1054 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1055 "unexpected capabilities received");
1056 break;
1057 }
1058 log_debug("receiving capabilities from uid %d",
1059 client->euid);
1060 err = recv_capabilities(client, &imsg);
1061 break;
1062 case GOTD_IMSG_CAPABILITY:
1063 if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1064 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1065 "unexpected capability received");
1066 break;
1067 }
1068 err = recv_capability(client, &imsg);
1069 if (err || client->ncapabilities < client->ncapa_alloc)
1070 break;
1071 if (!client->is_writing) {
1072 client->state = GOTD_STATE_EXPECT_WANT;
1073 client->accept_flush_pkt = 1;
1074 log_debug("uid %d: expecting want-lines",
1075 client->euid);
1076 } else if (client->is_writing) {
1077 client->state = GOTD_STATE_EXPECT_REF_UPDATE;
1078 client->accept_flush_pkt = 1;
1079 log_debug("uid %d: expecting ref-update-lines",
1080 client->euid);
1081 } else
1082 fatalx("client %d is both reading and writing",
1083 client->euid);
1084 break;
1085 case GOTD_IMSG_WANT:
1086 if (client->state != GOTD_STATE_EXPECT_WANT) {
1087 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1088 "unexpected want-line received");
1089 break;
1090 }
1091 log_debug("received want-line from uid %d",
1092 client->euid);
1093 err = ensure_client_is_reading(client);
1094 if (err)
1095 break;
1096 client->accept_flush_pkt = 1;
1097 err = forward_want(client, &imsg);
1098 break;
1099 case GOTD_IMSG_REF_UPDATE:
1100 if (client->state != GOTD_STATE_EXPECT_REF_UPDATE &&
1101 client->state !=
1102 GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1103 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1104 "unexpected ref-update-line received");
1105 break;
1106 }
1107 log_debug("received ref-update-line from uid %d",
1108 client->euid);
1109 err = ensure_client_is_writing(client);
1110 if (err)
1111 break;
1112 err = forward_ref_update(client, &imsg);
1113 if (err)
1114 break;
1115 client->state = GOTD_STATE_EXPECT_MORE_REF_UPDATES;
1116 client->accept_flush_pkt = 1;
1117 break;
1118 case GOTD_IMSG_HAVE:
1119 if (client->state != GOTD_STATE_EXPECT_HAVE) {
1120 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1121 "unexpected have-line received");
1122 break;
1123 }
1124 log_debug("received have-line from uid %d",
1125 client->euid);
1126 err = ensure_client_is_reading(client);
1127 if (err)
1128 break;
1129 err = forward_have(client, &imsg);
1130 if (err)
1131 break;
1132 client->accept_flush_pkt = 1;
1133 break;
1134 case GOTD_IMSG_FLUSH:
1135 if (client->state == GOTD_STATE_EXPECT_WANT ||
1136 client->state == GOTD_STATE_EXPECT_HAVE) {
1137 err = ensure_client_is_reading(client);
1138 if (err)
1139 break;
1140 } else if (client->state ==
1141 GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1142 err = ensure_client_is_writing(client);
1143 if (err)
1144 break;
1145 } else if (client->state != GOTD_STATE_EXPECT_DONE) {
1146 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1147 "unexpected flush-pkt received");
1148 break;
1149 }
1150 if (!client->accept_flush_pkt) {
1151 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1152 "unexpected flush-pkt received");
1153 break;
1154 }
1155
1156 /*
1157 * Accept just one flush packet at a time.
1158 * Future client state transitions will set this flag
1159 * again if another flush packet is expected.
1160 */
1161 client->accept_flush_pkt = 0;
1162
1163 log_debug("received flush-pkt from uid %d",
1164 client->euid);
1165 if (client->state == GOTD_STATE_EXPECT_WANT) {
1166 client->state = GOTD_STATE_EXPECT_HAVE;
1167 log_debug("uid %d: expecting have-lines",
1168 client->euid);
1169 } else if (client->state == GOTD_STATE_EXPECT_HAVE) {
1170 client->state = GOTD_STATE_EXPECT_DONE;
1171 client->accept_flush_pkt = 1;
1172 log_debug("uid %d: expecting 'done'",
1173 client->euid);
1174 } else if (client->state ==
1175 GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1176 client->state = GOTD_STATE_EXPECT_PACKFILE;
1177 log_debug("uid %d: expecting packfile",
1178 client->euid);
1179 err = recv_packfile(client);
1180 } else if (client->state != GOTD_STATE_EXPECT_DONE) {
1181 /* should not happen, see above */
1182 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1183 "unexpected client state");
1184 break;
1185 }
1186 break;
1187 case GOTD_IMSG_DONE:
1188 if (client->state != GOTD_STATE_EXPECT_HAVE &&
1189 client->state != GOTD_STATE_EXPECT_DONE) {
1190 err = got_error_msg(GOT_ERR_BAD_REQUEST,
1191 "unexpected flush-pkt received");
1192 break;
1193 }
1194 log_debug("received 'done' from uid %d", client->euid);
1195 err = ensure_client_is_reading(client);
1196 if (err)
1197 break;
1198 client->state = GOTD_STATE_DONE;
1199 client->accept_flush_pkt = 1;
1200 err = send_packfile(client);
1201 break;
1202 default:
1203 log_debug("unexpected imsg %d", imsg.hdr.type);
1204 err = got_error(GOT_ERR_PRIVSEP_MSG);
1205 break;
1206 }
1207
1208 imsg_free(&imsg);
1209 }
1210
1211 if (err) {
1212 if (err->code != GOT_ERR_EOF ||
1213 client->state != GOTD_STATE_EXPECT_PACKFILE)
1214 disconnect_on_error(client, err);
1215 } else {
1216 gotd_imsg_event_add(iev);
1217 evtimer_add(&client->tmo, &gotd_session.request_timeout);
1218 }
1219 }
1220
1221 static const struct got_error *
1222 list_refs_request(void)
1223 {
1224 static const struct got_error *err;
1225 struct gotd_session_client *client = &gotd_session_client;
1226 struct gotd_imsgev *iev = &client->repo_child_iev;
1227 struct gotd_imsg_list_refs_internal ilref;
1228 int fd;
1229
1230 if (client->state != GOTD_STATE_EXPECT_LIST_REFS)
1231 return got_error(GOT_ERR_PRIVSEP_MSG);
1232
1233 memset(&ilref, 0, sizeof(ilref));
1234 ilref.client_id = client->id;
1235
1236 fd = dup(client->fd);
1237 if (fd == -1)
1238 return got_error_from_errno("dup");
1239
1240 if (gotd_imsg_compose_event(iev, GOTD_IMSG_LIST_REFS_INTERNAL,
1241 PROC_SESSION, fd, &ilref, sizeof(ilref)) == -1) {
1242 err = got_error_from_errno("imsg compose LIST_REFS_INTERNAL");
1243 close(fd);
1244 return err;
1245 }
1246
1247 client->state = GOTD_STATE_EXPECT_CAPABILITIES;
1248 log_debug("uid %d: expecting capabilities", client->euid);
1249 return NULL;
1250 }
1251
1252 static const struct got_error *
1253 recv_connect(struct imsg *imsg)
1254 {
1255 struct gotd_session_client *client = &gotd_session_client;
1256 struct gotd_imsg_connect iconnect;
1257 size_t datalen;
1258
1259 if (client->state != GOTD_STATE_EXPECT_LIST_REFS)
1260 return got_error(GOT_ERR_PRIVSEP_MSG);
1261
1262 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1263 if (datalen != sizeof(iconnect))
1264 return got_error(GOT_ERR_PRIVSEP_LEN);
1265 memcpy(&iconnect, imsg->data, sizeof(iconnect));
1266
1267 if (imsg->fd == -1)
1268 return got_error(GOT_ERR_PRIVSEP_NO_FD);
1269
1270 client->fd = imsg->fd;
1271 client->euid = iconnect.euid;
1272 client->egid = iconnect.egid;
1273
1274 imsg_init(&client->iev.ibuf, client->fd);
1275 client->iev.handler = session_dispatch_client;
1276 client->iev.events = EV_READ;
1277 client->iev.handler_arg = NULL;
1278 event_set(&client->iev.ev, client->iev.ibuf.fd, EV_READ,
1279 session_dispatch_client, &client->iev);
1280 gotd_imsg_event_add(&client->iev);
1281 evtimer_set(&client->tmo, gotd_request_timeout, client);
1282
1283 return NULL;
1284 }
1285
1286 static const struct got_error *
1287 recv_repo_child(struct imsg *imsg)
1288 {
1289 struct gotd_imsg_connect_repo_child ichild;
1290 struct gotd_session_client *client = &gotd_session_client;
1291 size_t datalen;
1292
1293 if (client->state != GOTD_STATE_EXPECT_LIST_REFS)
1294 return got_error(GOT_ERR_PRIVSEP_MSG);
1295
1296 /* We should already have received a pipe to the listener. */
1297 if (client->fd == -1)
1298 return got_error(GOT_ERR_PRIVSEP_MSG);
1299
1300 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1301 if (datalen != sizeof(ichild))
1302 return got_error(GOT_ERR_PRIVSEP_LEN);
1303
1304 memcpy(&ichild, imsg->data, sizeof(ichild));
1305
1306 client->id = ichild.client_id;
1307 if (ichild.proc_id == PROC_REPO_WRITE)
1308 client->is_writing = 1;
1309 else if (ichild.proc_id == PROC_REPO_READ)
1310 client->is_writing = 0;
1311 else
1312 return got_error_msg(GOT_ERR_PRIVSEP_MSG,
1313 "bad child process type");
1314
1315 if (imsg->fd == -1)
1316 return got_error(GOT_ERR_PRIVSEP_NO_FD);
1317
1318 imsg_init(&client->repo_child_iev.ibuf, imsg->fd);
1319 client->repo_child_iev.handler = session_dispatch_repo_child;
1320 client->repo_child_iev.events = EV_READ;
1321 client->repo_child_iev.handler_arg = NULL;
1322 event_set(&client->repo_child_iev.ev, client->repo_child_iev.ibuf.fd,
1323 EV_READ, session_dispatch_repo_child, &client->repo_child_iev);
1324 gotd_imsg_event_add(&client->repo_child_iev);
1325
1326 /* The "recvfd" pledge promise is no longer needed. */
1327 if (pledge("stdio rpath wpath cpath sendfd fattr flock", NULL) == -1)
1328 fatal("pledge");
1329
1330 return NULL;
1331 }
1332
1333 static void
1334 session_dispatch(int fd, short event, void *arg)
1335 {
1336 struct gotd_imsgev *iev = arg;
1337 struct imsgbuf *ibuf = &iev->ibuf;
1338 struct gotd_session_client *client = &gotd_session_client;
1339 ssize_t n;
1340 int shut = 0;
1341 struct imsg imsg;
1342
1343 if (event & EV_READ) {
1344 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1345 fatal("imsg_read error");
1346 if (n == 0) {
1347 /* Connection closed. */
1348 shut = 1;
1349 goto done;
1350 }
1351 }
1352
1353 if (event & EV_WRITE) {
1354 n = msgbuf_write(&ibuf->w);
1355 if (n == -1 && errno != EAGAIN)
1356 fatal("msgbuf_write");
1357 if (n == 0) {
1358 /* Connection closed. */
1359 shut = 1;
1360 goto done;
1361 }
1362 }
1363
1364 for (;;) {
1365 const struct got_error *err = NULL;
1366 uint32_t client_id = 0;
1367 int do_disconnect = 0, do_list_refs = 0;
1368
1369 if ((n = imsg_get(ibuf, &imsg)) == -1)
1370 fatal("%s: imsg_get error", __func__);
1371 if (n == 0) /* No more messages. */
1372 break;
1373
1374 switch (imsg.hdr.type) {
1375 case GOTD_IMSG_ERROR:
1376 do_disconnect = 1;
1377 err = gotd_imsg_recv_error(&client_id, &imsg);
1378 break;
1379 case GOTD_IMSG_CONNECT:
1380 err = recv_connect(&imsg);
1381 break;
1382 case GOTD_IMSG_DISCONNECT:
1383 do_disconnect = 1;
1384 break;
1385 case GOTD_IMSG_CONNECT_REPO_CHILD:
1386 err = recv_repo_child(&imsg);
1387 if (err)
1388 break;
1389 do_list_refs = 1;
1390 break;
1391 default:
1392 log_debug("unexpected imsg %d", imsg.hdr.type);
1393 break;
1394 }
1395 imsg_free(&imsg);
1396
1397 if (do_disconnect) {
1398 if (err)
1399 disconnect_on_error(client, err);
1400 else
1401 disconnect(client);
1402 } else if (do_list_refs)
1403 err = list_refs_request();
1404
1405 if (err)
1406 log_warnx("uid %d: %s", client->euid, err->msg);
1407 }
1408 done:
1409 if (!shut) {
1410 gotd_imsg_event_add(iev);
1411 } else {
1412 /* This pipe is dead. Remove its event handler */
1413 event_del(&iev->ev);
1414 event_loopexit(NULL);
1415 }
1416 }
1417
1418 void
1419 session_main(const char *title, const char *repo_path,
1420 int *pack_fds, int *temp_fds, struct timeval *request_timeout)
1421 {
1422 const struct got_error *err = NULL;
1423 struct event evsigint, evsigterm, evsighup, evsigusr1;
1424
1425 gotd_session.title = title;
1426 gotd_session.pid = getpid();
1427 gotd_session.pack_fds = pack_fds;
1428 gotd_session.temp_fds = temp_fds;
1429 memcpy(&gotd_session.request_timeout, request_timeout,
1430 sizeof(gotd_session.request_timeout));
1431
1432 err = got_repo_open(&gotd_session.repo, repo_path, NULL, pack_fds);
1433 if (err)
1434 goto done;
1435 if (!got_repo_is_bare(gotd_session.repo)) {
1436 err = got_error_msg(GOT_ERR_NOT_GIT_REPO,
1437 "bare git repository required");
1438 goto done;
1439 }
1440
1441 got_repo_temp_fds_set(gotd_session.repo, temp_fds);
1442
1443 signal_set(&evsigint, SIGINT, gotd_session_sighdlr, NULL);
1444 signal_set(&evsigterm, SIGTERM, gotd_session_sighdlr, NULL);
1445 signal_set(&evsighup, SIGHUP, gotd_session_sighdlr, NULL);
1446 signal_set(&evsigusr1, SIGUSR1, gotd_session_sighdlr, NULL);
1447 signal(SIGPIPE, SIG_IGN);
1448
1449 signal_add(&evsigint, NULL);
1450 signal_add(&evsigterm, NULL);
1451 signal_add(&evsighup, NULL);
1452 signal_add(&evsigusr1, NULL);
1453
1454 gotd_session_client.state = GOTD_STATE_EXPECT_LIST_REFS;
1455 gotd_session_client.fd = -1;
1456 gotd_session_client.nref_updates = -1;
1457 gotd_session_client.delta_cache_fd = -1;
1458 gotd_session_client.accept_flush_pkt = 1;
1459
1460 imsg_init(&gotd_session.parent_iev.ibuf, GOTD_FILENO_MSG_PIPE);
1461 gotd_session.parent_iev.handler = session_dispatch;
1462 gotd_session.parent_iev.events = EV_READ;
1463 gotd_session.parent_iev.handler_arg = NULL;
1464 event_set(&gotd_session.parent_iev.ev, gotd_session.parent_iev.ibuf.fd,
1465 EV_READ, session_dispatch, &gotd_session.parent_iev);
1466 if (gotd_imsg_compose_event(&gotd_session.parent_iev,
1467 GOTD_IMSG_CLIENT_SESSION_READY, PROC_SESSION, -1, NULL, 0) == -1) {
1468 err = got_error_from_errno("imsg compose CLIENT_SESSION_READY");
1469 goto done;
1470 }
1471
1472 event_dispatch();
1473 done:
1474 if (err)
1475 log_warnx("%s: %s", title, err->msg);
1476 gotd_session_shutdown();
1477 }
1478
1479 void
1480 gotd_session_shutdown(void)
1481 {
1482 log_debug("shutting down");
1483 if (gotd_session.repo)
1484 got_repo_close(gotd_session.repo);
1485 got_repo_pack_fds_close(gotd_session.pack_fds);
1486 got_repo_temp_fds_close(gotd_session.temp_fds);
1487 exit(0);
1488 }
portable version of Game of Trees