2 * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
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.
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.
17 #include <sys/types.h>
18 #include <sys/queue.h>
32 #include "got_error.h"
33 #include "got_serve.h"
35 #include "got_version.h"
36 #include "got_reference.h"
37 #include "got_object.h"
39 #include "got_lib_pkt.h"
40 #include "got_lib_dial.h"
41 #include "got_lib_gitproto.h"
42 #include "got_lib_hash.h"
43 #include "got_lib_poll.h"
48 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
51 static const struct got_capability read_capabilities[] = {
52 { GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
53 { GOT_CAPA_OFS_DELTA, NULL },
54 { GOT_CAPA_SIDE_BAND_64K, NULL },
57 static const struct got_capability write_capabilities[] = {
58 { GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
59 { GOT_CAPA_OFS_DELTA, NULL },
60 { GOT_CAPA_REPORT_STATUS, NULL },
61 { GOT_CAPA_NO_THIN, NULL },
62 { GOT_CAPA_DELETE_REFS, NULL },
65 static const struct got_error *
66 append_read_capabilities(size_t *capalen, size_t len, const char *symrefstr,
67 uint8_t *buf, size_t bufsize)
69 struct got_capability capa[nitems(read_capabilities) + 1];
72 memcpy(&capa, read_capabilities, sizeof(read_capabilities));
74 capa[nitems(read_capabilities)].key = "symref";
75 capa[nitems(read_capabilities)].value = symrefstr;
78 ncapa = nitems(read_capabilities);
80 return got_gitproto_append_capabilities(capalen, buf, len,
81 bufsize, capa, ncapa);
84 static const struct got_error *
85 send_ref(int outfd, uint8_t *id, const char *refname, int send_capabilities,
86 int client_is_reading, const char *symrefstr, int chattygot)
88 const struct got_error *err = NULL;
89 char hex[SHA1_DIGEST_STRING_LENGTH];
90 char buf[GOT_PKT_MAX];
91 size_t len, capalen = 0;
93 if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
94 return got_error(GOT_ERR_BAD_OBJ_ID);
96 len = snprintf(buf, sizeof(buf), "%s %s", hex, refname);
97 if (len >= sizeof(buf))
98 return got_error(GOT_ERR_NO_SPACE);
100 if (send_capabilities) {
101 if (client_is_reading) {
102 err = append_read_capabilities(&capalen, len,
103 symrefstr, buf, sizeof(buf));
105 err = got_gitproto_append_capabilities(&capalen,
106 buf, len, sizeof(buf), write_capabilities,
107 nitems(write_capabilities));
114 if (len + 1 >= sizeof(buf))
115 return got_error(GOT_ERR_NO_SPACE);
120 return got_pkt_writepkt(outfd, buf, len, chattygot);
123 static const struct got_error *
124 send_zero_refs(int outfd, int client_is_reading, int chattygot)
126 const struct got_error *err = NULL;
127 const char *line = GOT_SHA1_STRING_ZERO " capabilities^{}";
128 char buf[GOT_PKT_MAX];
129 size_t len, capalen = 0;
131 len = strlcpy(buf, line, sizeof(buf));
132 if (len >= sizeof(buf))
133 return got_error(GOT_ERR_NO_SPACE);
135 if (client_is_reading) {
136 err = got_gitproto_append_capabilities(&capalen, buf, len,
137 sizeof(buf), read_capabilities, nitems(read_capabilities));
141 err = got_gitproto_append_capabilities(&capalen, buf, len,
142 sizeof(buf), write_capabilities,
143 nitems(write_capabilities));
148 return got_pkt_writepkt(outfd, buf, len + capalen, chattygot);
152 echo_error(const struct got_error *err, int outfd, int chattygot)
154 char buf[4 + GOT_ERR_MAX_MSG_SIZE];
158 * Echo the error to the client on a pkt-line.
159 * The client should then terminate its session.
161 buf[0] = 'E'; buf[1] = 'R'; buf[2] = 'R'; buf[3] = ' '; buf[4] = '\0';
162 len = strlcat(buf, err->msg, sizeof(buf));
163 got_pkt_writepkt(outfd, buf, len, chattygot);
166 static const struct got_error *
167 announce_refs(int outfd, struct imsgbuf *ibuf, int client_is_reading,
168 const char *repo_path, int chattygot)
170 const struct got_error *err = NULL;
173 struct gotd_imsg_list_refs lsref;
174 struct gotd_imsg_reflist ireflist;
175 struct gotd_imsg_ref iref;
176 struct gotd_imsg_symref isymref;
178 int have_nrefs = 0, sent_capabilities = 0;
179 char *symrefname = NULL, *symreftarget = NULL, *symrefstr = NULL;
180 char *refname = NULL;
182 memset(&imsg, 0, sizeof(imsg));
183 memset(&lsref, 0, sizeof(lsref));
185 if (strlcpy(lsref.repo_name, repo_path, sizeof(lsref.repo_name)) >=
186 sizeof(lsref.repo_name))
187 return got_error(GOT_ERR_NO_SPACE);
188 lsref.client_is_reading = client_is_reading;
190 if (imsg_compose(ibuf, GOTD_IMSG_LIST_REFS, 0, 0, -1,
191 &lsref, sizeof(lsref)) == -1)
192 return got_error_from_errno("imsg_compose LIST_REFS");
194 err = gotd_imsg_flush(ibuf);
198 while (!have_nrefs || nrefs > 0) {
199 err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
202 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
203 switch (imsg.hdr.type) {
204 case GOTD_IMSG_ERROR:
205 err = gotd_imsg_recv_error(NULL, &imsg);
207 case GOTD_IMSG_REFLIST:
208 if (have_nrefs || nrefs > 0) {
209 err = got_error(GOT_ERR_PRIVSEP_MSG);
212 if (datalen != sizeof(ireflist)) {
213 err = got_error(GOT_ERR_PRIVSEP_MSG);
216 memcpy(&ireflist, imsg.data, sizeof(ireflist));
217 nrefs = ireflist.nrefs;
220 err = send_zero_refs(outfd, client_is_reading,
224 if (!have_nrefs || nrefs == 0) {
225 err = got_error(GOT_ERR_PRIVSEP_MSG);
228 if (datalen < sizeof(iref)) {
229 err = got_error(GOT_ERR_PRIVSEP_MSG);
232 memcpy(&iref, imsg.data, sizeof(iref));
233 if (datalen != sizeof(iref) + iref.name_len) {
234 err = got_error(GOT_ERR_PRIVSEP_LEN);
237 refname = strndup(imsg.data + sizeof(iref),
239 if (refname == NULL) {
240 err = got_error_from_errno("strndup");
243 err = send_ref(outfd, iref.id, refname,
244 !sent_capabilities, client_is_reading,
250 sent_capabilities = 1;
254 case GOTD_IMSG_SYMREF:
255 if (!have_nrefs || nrefs == 0) {
256 err = got_error(GOT_ERR_PRIVSEP_MSG);
259 if (datalen < sizeof(isymref)) {
260 err = got_error(GOT_ERR_PRIVSEP_LEN);
263 memcpy(&isymref, imsg.data, sizeof(isymref));
264 if (datalen != sizeof(isymref) + isymref.name_len +
265 isymref.target_len) {
266 err = got_error(GOT_ERR_PRIVSEP_LEN);
271 * For now, we only announce one symbolic ref,
272 * as part of our capability advertisement.
274 if (sent_capabilities || symrefstr != NULL ||
275 symrefname != NULL || symreftarget != NULL)
278 symrefname = strndup(imsg.data + sizeof(isymref),
280 if (symrefname == NULL) {
281 err = got_error_from_errno("malloc");
285 symreftarget = strndup(
286 imsg.data + sizeof(isymref) + isymref.name_len,
288 if (symreftarget == NULL) {
289 err = got_error_from_errno("strndup");
293 if (asprintf(&symrefstr, "%s:%s", symrefname,
294 symreftarget) == -1) {
295 err = got_error_from_errno("asprintf");
298 err = send_ref(outfd, isymref.target_id, symrefname,
299 !sent_capabilities, client_is_reading, symrefstr,
305 sent_capabilities = 1;
310 err = got_error(GOT_ERR_PRIVSEP_MSG);
317 err = got_pkt_flushpkt(outfd, chattygot);
327 static const struct got_error *
328 parse_want_line(char **common_capabilities, uint8_t *id, char *buf, size_t len)
330 const struct got_error *err;
331 char *id_str = NULL, *client_capabilities = NULL;
333 err = got_gitproto_parse_want_line(&id_str,
334 &client_capabilities, buf, len);
338 if (!got_parse_hash_digest(id, id_str, GOT_HASH_SHA1)) {
339 err = got_error_msg(GOT_ERR_BAD_PACKET,
340 "want-line with bad object ID");
344 if (client_capabilities) {
345 err = got_gitproto_match_capabilities(common_capabilities,
346 NULL, client_capabilities, read_capabilities,
347 nitems(read_capabilities));
353 free(client_capabilities);
357 static const struct got_error *
358 parse_have_line(uint8_t *id, char *buf, size_t len)
360 const struct got_error *err;
363 err = got_gitproto_parse_have_line(&id_str, buf, len);
367 if (!got_parse_hash_digest(id, id_str, GOT_HASH_SHA1)) {
368 err = got_error_msg(GOT_ERR_BAD_PACKET,
369 "have-line with bad object ID");
377 static const struct got_error *
378 send_capability(struct got_capability *capa, struct imsgbuf *ibuf)
380 const struct got_error *err = NULL;
381 struct gotd_imsg_capability icapa;
385 memset(&icapa, 0, sizeof(icapa));
387 icapa.key_len = strlen(capa->key);
388 len = sizeof(icapa) + icapa.key_len;
390 icapa.value_len = strlen(capa->value);
391 len += icapa.value_len;
394 wbuf = imsg_create(ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
396 err = got_error_from_errno("imsg_create CAPABILITY");
400 if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
401 return got_error_from_errno("imsg_add CAPABILITY");
402 if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
403 return got_error_from_errno("imsg_add CAPABILITY");
405 if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
406 return got_error_from_errno("imsg_add CAPABILITY");
410 imsg_close(ibuf, wbuf);
415 static const struct got_error *
416 send_capabilities(int *use_sidebands, int *report_status,
417 char *capabilities_str, struct imsgbuf *ibuf)
419 const struct got_error *err = NULL;
420 struct gotd_imsg_capabilities icapas;
421 struct got_capability *capa = NULL;
424 err = got_gitproto_split_capabilities_str(&capa, &ncapa,
429 icapas.ncapabilities = ncapa;
430 if (imsg_compose(ibuf, GOTD_IMSG_CAPABILITIES, 0, 0, -1,
431 &icapas, sizeof(icapas)) == -1) {
432 err = got_error_from_errno("imsg_compose IMSG_CAPABILITIES");
436 for (i = 0; i < ncapa; i++) {
437 err = send_capability(&capa[i], ibuf);
441 strcmp(capa[i].key, GOT_CAPA_SIDE_BAND_64K) == 0)
444 strcmp(capa[i].key, GOT_CAPA_REPORT_STATUS) == 0)
452 static const struct got_error *
453 forward_flushpkt(struct imsgbuf *ibuf)
455 if (imsg_compose(ibuf, GOTD_IMSG_FLUSH, 0, 0, -1, NULL, 0) == -1)
456 return got_error_from_errno("imsg_compose FLUSH");
458 return gotd_imsg_flush(ibuf);
461 static const struct got_error *
462 recv_ack(struct imsg *imsg, uint8_t *expected_id)
464 struct gotd_imsg_ack iack;
467 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
468 if (datalen != sizeof(iack))
469 return got_error(GOT_ERR_PRIVSEP_LEN);
471 memcpy(&iack, imsg->data, sizeof(iack));
472 if (memcmp(iack.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
473 return got_error(GOT_ERR_BAD_OBJ_ID);
478 static const struct got_error *
479 recv_nak(struct imsg *imsg, uint8_t *expected_id)
481 struct gotd_imsg_ack inak;
484 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
485 if (datalen != sizeof(inak))
486 return got_error(GOT_ERR_PRIVSEP_LEN);
488 memcpy(&inak, imsg->data, sizeof(inak));
489 if (memcmp(inak.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
490 return got_error(GOT_ERR_BAD_OBJ_ID);
496 static const struct got_error *
497 recv_want(int *use_sidebands, int outfd, struct imsgbuf *ibuf,
498 char *buf, size_t len, int expect_capabilities, int chattygot)
500 const struct got_error *err;
501 struct gotd_imsg_want iwant;
502 char *capabilities_str;
506 memset(&iwant, 0, sizeof(iwant));
507 memset(&imsg, 0, sizeof(imsg));
509 err = parse_want_line(&capabilities_str, iwant.object_id, buf, len);
513 if (capabilities_str) {
514 if (!expect_capabilities) {
515 err = got_error_msg(GOT_ERR_BAD_PACKET,
516 "unexpected capability announcement received");
519 err = send_capabilities(use_sidebands, NULL, capabilities_str,
526 if (imsg_compose(ibuf, GOTD_IMSG_WANT, 0, 0, -1,
527 &iwant, sizeof(iwant)) == -1) {
528 err = got_error_from_errno("imsg_compose WANT");
532 err = gotd_imsg_flush(ibuf);
537 * Wait for an ACK, or an error in case the desired object
540 while (!done && err == NULL) {
541 err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
544 switch (imsg.hdr.type) {
545 case GOTD_IMSG_ERROR:
546 err = gotd_imsg_recv_error(NULL, &imsg);
549 err = recv_ack(&imsg, iwant.object_id);
555 err = got_error(GOT_ERR_PRIVSEP_MSG);
562 free(capabilities_str);
566 static const struct got_error *
567 send_ack(int outfd, uint8_t *id, int chattygot)
569 char hex[SHA1_DIGEST_STRING_LENGTH];
570 char buf[GOT_PKT_MAX];
573 if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
574 return got_error(GOT_ERR_BAD_OBJ_ID);
576 len = snprintf(buf, sizeof(buf), "ACK %s\n", hex);
577 if (len >= sizeof(buf))
578 return got_error(GOT_ERR_NO_SPACE);
580 return got_pkt_writepkt(outfd, buf, len, chattygot);
583 static const struct got_error *
584 send_nak(int outfd, int chattygot)
589 len = snprintf(buf, sizeof(buf), "NAK\n");
590 if (len >= sizeof(buf))
591 return got_error(GOT_ERR_NO_SPACE);
593 return got_pkt_writepkt(outfd, buf, len, chattygot);
596 static const struct got_error *
597 recv_have(int *have_ack, int outfd, struct imsgbuf *ibuf, char *buf,
598 size_t len, int chattygot)
600 const struct got_error *err;
601 struct gotd_imsg_have ihave;
605 memset(&ihave, 0, sizeof(ihave));
606 memset(&imsg, 0, sizeof(imsg));
608 err = parse_have_line(ihave.object_id, buf, len);
612 if (imsg_compose(ibuf, GOTD_IMSG_HAVE, 0, 0, -1,
613 &ihave, sizeof(ihave)) == -1)
614 return got_error_from_errno("imsg_compose HAVE");
616 err = gotd_imsg_flush(ibuf);
621 * Wait for an ACK or a NAK, indicating whether a common
622 * commit object has been found.
624 while (!done && err == NULL) {
625 err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
628 switch (imsg.hdr.type) {
629 case GOTD_IMSG_ERROR:
630 err = gotd_imsg_recv_error(NULL, &imsg);
633 err = recv_ack(&imsg, ihave.object_id);
637 err = send_ack(outfd, ihave.object_id,
646 err = recv_nak(&imsg, ihave.object_id);
652 err = got_error(GOT_ERR_PRIVSEP_MSG);
662 static const struct got_error *
663 recv_done(int *packfd, int outfd, struct imsgbuf *ibuf, int chattygot)
665 const struct got_error *err;
670 if (imsg_compose(ibuf, GOTD_IMSG_DONE, 0, 0, -1, NULL, 0) == -1)
671 return got_error_from_errno("imsg_compose DONE");
673 err = gotd_imsg_flush(ibuf);
677 while (*packfd == -1 && err == NULL) {
678 err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
682 switch (imsg.hdr.type) {
683 case GOTD_IMSG_ERROR:
684 err = gotd_imsg_recv_error(NULL, &imsg);
686 case GOTD_IMSG_PACKFILE_PIPE:
690 err = got_error(GOT_ERR_PRIVSEP_NO_FD);
693 err = got_error(GOT_ERR_PRIVSEP_MSG);
703 static const struct got_error *
704 relay_progress_reports(struct imsgbuf *ibuf, int outfd, int chattygot)
706 const struct got_error *err = NULL;
707 int pack_starting = 0;
708 struct gotd_imsg_packfile_progress iprog;
709 char buf[GOT_PKT_MAX];
712 int p_deltify = 0, n;
713 const char *eol = "\r";
715 memset(&imsg, 0, sizeof(imsg));
717 while (!pack_starting && err == NULL) {
718 err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
722 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
723 switch (imsg.hdr.type) {
724 case GOTD_IMSG_ERROR:
725 err = gotd_imsg_recv_error(NULL, &imsg);
727 case GOTD_IMSG_PACKFILE_READY:
731 case GOTD_IMSG_PACKFILE_PROGRESS:
732 if (datalen != sizeof(iprog)) {
733 err = got_error(GOT_ERR_PRIVSEP_LEN);
736 memcpy(&iprog, imsg.data, sizeof(iprog));
737 if (iprog.nobj_total > 0) {
738 p_deltify = (iprog.nobj_deltify * 100) /
741 buf[0] = GOT_SIDEBAND_PROGRESS_INFO;
742 n = snprintf(&buf[1], sizeof(buf) - 1,
743 "%d commits colored, "
749 if (n >= sizeof(buf) - 1)
751 err = got_pkt_writepkt(outfd, buf, 1 + n, chattygot);
754 err = got_error(GOT_ERR_PRIVSEP_MSG);
764 static const struct got_error *
765 serve_read(int infd, int outfd, int gotd_sock, const char *repo_path,
768 const struct got_error *err = NULL;
769 char buf[GOT_PKT_MAX];
773 STATE_EXPECT_MORE_WANT,
778 enum protostate curstate = STATE_EXPECT_WANT;
779 int have_ack = 0, use_sidebands = 0, seen_have = 0;
781 size_t pack_chunksize;
783 imsg_init(&ibuf, gotd_sock);
785 err = announce_refs(outfd, &ibuf, 1, repo_path, chattygot);
789 while (curstate != STATE_DONE) {
792 err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot);
796 if (curstate != STATE_EXPECT_WANT &&
797 curstate != STATE_EXPECT_MORE_WANT &&
798 curstate != STATE_EXPECT_HAVE &&
799 curstate != STATE_EXPECT_DONE) {
800 err = got_error_msg(GOT_ERR_BAD_PACKET,
801 "unexpected flush packet received");
805 if (curstate == STATE_EXPECT_WANT) {
808 * If the client does not want to fetch
809 * anything we should receive a flush
810 * packet followed by EOF.
812 r = read(infd, buf, sizeof(buf));
814 err = got_error_from_errno("read");
817 if (r == 0) /* EOF */
820 /* Zero-length field followed by payload. */
821 err = got_error_msg(GOT_ERR_BAD_PACKET,
822 "unexpected flush packet received");
826 if (curstate == STATE_EXPECT_WANT ||
827 curstate == STATE_EXPECT_MORE_WANT ||
828 curstate == STATE_EXPECT_HAVE) {
829 err = forward_flushpkt(&ibuf);
833 if (curstate == STATE_EXPECT_HAVE && !have_ack) {
834 err = send_nak(outfd, chattygot);
838 if (curstate == STATE_EXPECT_MORE_WANT)
839 curstate = STATE_EXPECT_HAVE;
841 curstate = STATE_EXPECT_DONE;
842 } else if (n >= 5 && strncmp(buf, "want ", 5) == 0) {
843 if (curstate != STATE_EXPECT_WANT &&
844 curstate != STATE_EXPECT_MORE_WANT) {
845 err = got_error_msg(GOT_ERR_BAD_PACKET,
846 "unexpected 'want' packet");
849 err = recv_want(&use_sidebands, outfd, &ibuf, buf, n,
850 curstate == STATE_EXPECT_WANT ? 1 : 0, chattygot);
853 if (curstate == STATE_EXPECT_WANT)
854 curstate = STATE_EXPECT_MORE_WANT;
855 } else if (n >= 5 && strncmp(buf, "have ", 5) == 0) {
856 if (curstate != STATE_EXPECT_HAVE &&
857 curstate != STATE_EXPECT_DONE) {
858 err = got_error_msg(GOT_ERR_BAD_PACKET,
859 "unexpected 'have' packet");
862 if (curstate == STATE_EXPECT_HAVE) {
863 err = recv_have(&have_ack, outfd, &ibuf,
869 } else if (n == 5 && strncmp(buf, "done\n", 5) == 0) {
870 if (curstate != STATE_EXPECT_HAVE &&
871 curstate != STATE_EXPECT_DONE) {
872 err = got_error_msg(GOT_ERR_BAD_PACKET,
873 "unexpected 'done' packet");
876 err = recv_done(&packfd, outfd, &ibuf, chattygot);
879 curstate = STATE_DONE;
882 err = got_error(GOT_ERR_BAD_PACKET);
888 err = send_nak(outfd, chattygot);
894 err = relay_progress_reports(&ibuf, outfd, chattygot);
897 pack_chunksize = GOT_SIDEBAND_64K_PACKFILE_DATA_MAX;
899 pack_chunksize = sizeof(buf);
904 r = read(packfd, use_sidebands ? &buf[1] : buf,
907 err = got_error_from_errno("read");
910 err = got_pkt_flushpkt(outfd, chattygot);
915 buf[0] = GOT_SIDEBAND_PACKFILE_DATA;
916 err = got_pkt_writepkt(outfd, buf, 1 + r, chattygot);
920 err = got_poll_write_full(outfd, buf, r);
922 if (err->code == GOT_ERR_EOF)
930 if (packfd != -1 && close(packfd) == -1 && err == NULL)
931 err = got_error_from_errno("close");
933 echo_error(err, outfd, chattygot);
937 static const struct got_error *
938 parse_ref_update_line(char **common_capabilities, char **refname,
939 uint8_t *old_id, uint8_t *new_id, char *buf, size_t len)
941 const struct got_error *err;
942 char *old_id_str = NULL, *new_id_str = NULL;
943 char *client_capabilities = NULL;
947 err = got_gitproto_parse_ref_update_line(&old_id_str, &new_id_str,
948 refname, &client_capabilities, buf, len);
952 if (!got_parse_hash_digest(old_id, old_id_str, GOT_HASH_SHA1) ||
953 !got_parse_hash_digest(new_id, new_id_str, GOT_HASH_SHA1)) {
954 err = got_error_msg(GOT_ERR_BAD_PACKET,
955 "ref-update with bad object ID");
958 if (!got_ref_name_is_valid(*refname)) {
959 err = got_error_msg(GOT_ERR_BAD_PACKET,
960 "ref-update with bad reference name");
964 if (client_capabilities) {
965 err = got_gitproto_match_capabilities(common_capabilities,
966 NULL, client_capabilities, write_capabilities,
967 nitems(write_capabilities));
974 free(client_capabilities);
982 static const struct got_error *
983 recv_ref_update(int *report_status, int outfd, struct imsgbuf *ibuf,
984 char *buf, size_t len, int expect_capabilities, int chattygot)
986 const struct got_error *err;
987 struct gotd_imsg_ref_update iref;
989 char *capabilities_str = NULL, *refname = NULL;
993 memset(&iref, 0, sizeof(iref));
994 memset(&imsg, 0, sizeof(imsg));
996 err = parse_ref_update_line(&capabilities_str, &refname,
997 iref.old_id, iref.new_id, buf, len);
1001 if (capabilities_str) {
1002 if (!expect_capabilities) {
1003 err = got_error_msg(GOT_ERR_BAD_PACKET,
1004 "unexpected capability announcement received");
1007 err = send_capabilities(NULL, report_status, capabilities_str,
1013 iref.name_len = strlen(refname);
1014 len = sizeof(iref) + iref.name_len;
1015 wbuf = imsg_create(ibuf, GOTD_IMSG_REF_UPDATE, 0, 0, len);
1017 err = got_error_from_errno("imsg_create REF_UPDATE");
1021 if (imsg_add(wbuf, &iref, sizeof(iref)) == -1)
1022 return got_error_from_errno("imsg_add REF_UPDATE");
1023 if (imsg_add(wbuf, refname, iref.name_len) == -1)
1024 return got_error_from_errno("imsg_add REF_UPDATE");
1026 imsg_close(ibuf, wbuf);
1028 err = gotd_imsg_flush(ibuf);
1032 /* Wait for ACK or an error. */
1033 while (!done && err == NULL) {
1034 err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
1037 switch (imsg.hdr.type) {
1038 case GOTD_IMSG_ERROR:
1039 err = gotd_imsg_recv_error(NULL, &imsg);
1042 err = recv_ack(&imsg, iref.new_id);
1048 err = got_error(GOT_ERR_PRIVSEP_MSG);
1055 free(capabilities_str);
1060 static const struct got_error *
1061 recv_packfile(struct imsg *imsg, int infd)
1063 const struct got_error *err = NULL;
1066 char buf[GOT_PKT_MAX];
1069 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1071 return got_error(GOT_ERR_PRIVSEP_MSG);
1074 return got_error(GOT_ERR_PRIVSEP_NO_FD);
1077 while (!pack_done) {
1080 err = got_poll_fd(infd, POLLIN, 1);
1082 if (err->code != GOT_ERR_TIMEOUT)
1086 r = read(infd, buf, sizeof(buf));
1088 err = got_error_from_errno("read");
1093 * Git clients hang up their side of the
1094 * connection after sending the pack file.
1103 /* Detect gotd(8) closing the pack pipe when done. */
1104 err = got_poll_fd(packfd, POLLOUT, 1);
1106 if (err->code != GOT_ERR_EOF)
1112 /* Write pack data and/or detect pipe being closed. */
1113 err = got_poll_write_full(packfd, buf, r);
1115 if (err->code == GOT_ERR_EOF)
1126 static const struct got_error *
1127 report_unpack_status(struct imsg *imsg, int outfd, int chattygot)
1129 const struct got_error *err = NULL;
1130 struct gotd_imsg_packfile_status istatus;
1131 char buf[GOT_PKT_MAX];
1132 size_t datalen, len;
1133 char *reason = NULL;
1135 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1136 if (datalen < sizeof(istatus))
1137 return got_error(GOT_ERR_PRIVSEP_LEN);
1138 memcpy(&istatus, imsg->data, sizeof(istatus));
1139 if (datalen != sizeof(istatus) + istatus.reason_len)
1140 return got_error(GOT_ERR_PRIVSEP_LEN);
1142 reason = strndup(imsg->data + sizeof(istatus), istatus.reason_len);
1143 if (reason == NULL) {
1144 err = got_error_from_errno("strndup");
1149 len = snprintf(buf, sizeof(buf), "unpack ok\n");
1151 len = snprintf(buf, sizeof(buf), "unpack %s\n", reason);
1152 if (len >= sizeof(buf)) {
1153 err = got_error(GOT_ERR_NO_SPACE);
1157 err = got_pkt_writepkt(outfd, buf, len, chattygot);
1163 static const struct got_error *
1164 recv_ref_update_ok(struct imsg *imsg, int outfd, int chattygot)
1166 const struct got_error *err = NULL;
1167 struct gotd_imsg_ref_update_ok iok;
1168 size_t datalen, len;
1169 char buf[GOT_PKT_MAX];
1170 char *refname = NULL;
1172 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1173 if (datalen < sizeof(iok))
1174 return got_error(GOT_ERR_PRIVSEP_LEN);
1175 memcpy(&iok, imsg->data, sizeof(iok));
1176 if (datalen != sizeof(iok) + iok.name_len)
1177 return got_error(GOT_ERR_PRIVSEP_LEN);
1179 memcpy(&iok, imsg->data, sizeof(iok));
1181 refname = strndup(imsg->data + sizeof(iok), iok.name_len);
1182 if (refname == NULL)
1183 return got_error_from_errno("strndup");
1185 len = snprintf(buf, sizeof(buf), "ok %s\n", refname);
1186 if (len >= sizeof(buf)) {
1187 err = got_error(GOT_ERR_NO_SPACE);
1191 err = got_pkt_writepkt(outfd, buf, len, chattygot);
1197 static const struct got_error *
1198 recv_ref_update_ng(struct imsg *imsg, int outfd, int chattygot)
1200 const struct got_error *err = NULL;
1201 struct gotd_imsg_ref_update_ng ing;
1202 size_t datalen, len;
1203 char buf[GOT_PKT_MAX];
1204 char *refname = NULL, *reason = NULL;
1206 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1207 if (datalen < sizeof(ing))
1208 return got_error(GOT_ERR_PRIVSEP_LEN);
1209 memcpy(&ing, imsg->data, sizeof(ing));
1210 if (datalen != sizeof(ing) + ing.name_len + ing.reason_len)
1211 return got_error(GOT_ERR_PRIVSEP_LEN);
1213 memcpy(&ing, imsg->data, sizeof(ing));
1215 refname = strndup(imsg->data + sizeof(ing), ing.name_len);
1216 if (refname == NULL)
1217 return got_error_from_errno("strndup");
1219 reason = strndup(imsg->data + sizeof(ing) + ing.name_len,
1221 if (reason == NULL) {
1222 err = got_error_from_errno("strndup");
1226 len = snprintf(buf, sizeof(buf), "ng %s %s\n", refname, reason);
1227 if (len >= sizeof(buf)) {
1228 err = got_error(GOT_ERR_NO_SPACE);
1232 err = got_pkt_writepkt(outfd, buf, len, chattygot);
1239 static const struct got_error *
1240 serve_write(int infd, int outfd, int gotd_sock, const char *repo_path,
1243 const struct got_error *err = NULL;
1244 char buf[GOT_PKT_MAX];
1245 struct imsgbuf ibuf;
1247 STATE_EXPECT_REF_UPDATE,
1248 STATE_EXPECT_MORE_REF_UPDATES,
1249 STATE_EXPECT_PACKFILE,
1250 STATE_PACKFILE_RECEIVED,
1253 enum protostate curstate = STATE_EXPECT_REF_UPDATE;
1255 int report_status = 0;
1257 imsg_init(&ibuf, gotd_sock);
1258 memset(&imsg, 0, sizeof(imsg));
1260 err = announce_refs(outfd, &ibuf, 0, repo_path, chattygot);
1264 while (curstate != STATE_EXPECT_PACKFILE) {
1267 err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot);
1271 if (curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1272 err = got_error_msg(GOT_ERR_BAD_PACKET,
1273 "unexpected flush packet received");
1276 err = forward_flushpkt(&ibuf);
1279 curstate = STATE_EXPECT_PACKFILE;
1280 } else if (n >= (SHA1_DIGEST_STRING_LENGTH * 2) + 2) {
1281 if (curstate != STATE_EXPECT_REF_UPDATE &&
1282 curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1283 err = got_error_msg(GOT_ERR_BAD_PACKET,
1284 "unexpected ref-update packet");
1287 if (curstate == STATE_EXPECT_REF_UPDATE) {
1288 err = recv_ref_update(&report_status,
1289 outfd, &ibuf, buf, n, 1, chattygot);
1291 err = recv_ref_update(NULL, outfd, &ibuf,
1292 buf, n, 0, chattygot);
1296 curstate = STATE_EXPECT_MORE_REF_UPDATES;
1298 err = got_error(GOT_ERR_BAD_PACKET);
1303 while (curstate != STATE_PACKFILE_RECEIVED) {
1304 err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1307 switch (imsg.hdr.type) {
1308 case GOTD_IMSG_ERROR:
1309 err = gotd_imsg_recv_error(NULL, &imsg);
1311 case GOTD_IMSG_RECV_PACKFILE:
1312 err = recv_packfile(&imsg, infd);
1314 if (err->code != GOT_ERR_EOF)
1317 * EOF is reported when the client hangs up,
1318 * which can happen with Git clients.
1319 * The socket should stay half-open so we
1320 * can still send our reports if requested.
1324 curstate = STATE_PACKFILE_RECEIVED;
1327 err = got_error(GOT_ERR_PRIVSEP_MSG);
1336 while (curstate != STATE_REFS_UPDATED && err == NULL) {
1337 err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1340 switch (imsg.hdr.type) {
1341 case GOTD_IMSG_ERROR:
1342 err = gotd_imsg_recv_error(NULL, &imsg);
1344 case GOTD_IMSG_PACKFILE_STATUS:
1347 err = report_unpack_status(&imsg, outfd, chattygot);
1349 case GOTD_IMSG_REF_UPDATE_OK:
1352 err = recv_ref_update_ok(&imsg, outfd, chattygot);
1354 case GOTD_IMSG_REF_UPDATE_NG:
1357 err = recv_ref_update_ng(&imsg, outfd, chattygot);
1359 case GOTD_IMSG_REFS_UPDATED:
1360 curstate = STATE_REFS_UPDATED;
1361 err = got_pkt_flushpkt(outfd, chattygot);
1364 err = got_error(GOT_ERR_PRIVSEP_MSG);
1373 echo_error(err, outfd, chattygot);
1377 const struct got_error *
1378 got_serve(int infd, int outfd, const char *command, const char *repo_path,
1379 int gotd_sock, int chattygot)
1381 const struct got_error *err = NULL;
1383 if (strcmp(command, GOT_DIAL_CMD_FETCH) == 0)
1384 err = serve_read(infd, outfd, gotd_sock, repo_path, chattygot);
1385 else if (strcmp(command, GOT_DIAL_CMD_SEND) == 0)
1386 err = serve_write(infd, outfd, gotd_sock, repo_path,
1389 err = got_error(GOT_ERR_BAD_PACKET);