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1 | #include "git-compat-util.h" | |
2 | #include "config.h" | |
3 | #include "environment.h" | |
4 | #include "gettext.h" | |
5 | #include "hex.h" | |
6 | #include "pkt-line.h" | |
7 | #include "quote.h" | |
8 | #include "refs.h" | |
9 | #include "run-command.h" | |
10 | #include "remote.h" | |
11 | #include "connect.h" | |
12 | #include "url.h" | |
13 | #include "string-list.h" | |
14 | #include "oid-array.h" | |
15 | #include "path.h" | |
16 | #include "transport.h" | |
17 | #include "trace2.h" | |
18 | #include "strbuf.h" | |
19 | #include "version.h" | |
20 | #include "protocol.h" | |
21 | #include "alias.h" | |
22 | #include "bundle-uri.h" | |
23 | ||
24 | static char *server_capabilities_v1; | |
25 | static struct strvec server_capabilities_v2 = STRVEC_INIT; | |
26 | static const char *next_server_feature_value(const char *feature, size_t *len, size_t *offset); | |
27 | ||
28 | static int check_ref(const char *name, unsigned int flags) | |
29 | { | |
30 | if (!flags) | |
31 | return 1; | |
32 | ||
33 | if (!skip_prefix(name, "refs/", &name)) | |
34 | return 0; | |
35 | ||
36 | /* REF_NORMAL means that we don't want the magic fake tag refs */ | |
37 | if ((flags & REF_NORMAL) && check_refname_format(name, | |
38 | REFNAME_ALLOW_ONELEVEL)) | |
39 | return 0; | |
40 | ||
41 | /* REF_HEADS means that we want regular branch heads */ | |
42 | if ((flags & REF_HEADS) && starts_with(name, "heads/")) | |
43 | return 1; | |
44 | ||
45 | /* REF_TAGS means that we want tags */ | |
46 | if ((flags & REF_TAGS) && starts_with(name, "tags/")) | |
47 | return 1; | |
48 | ||
49 | /* All type bits clear means that we are ok with anything */ | |
50 | return !(flags & ~REF_NORMAL); | |
51 | } | |
52 | ||
53 | int check_ref_type(const struct ref *ref, int flags) | |
54 | { | |
55 | return check_ref(ref->name, flags); | |
56 | } | |
57 | ||
58 | static NORETURN void die_initial_contact(int unexpected) | |
59 | { | |
60 | /* | |
61 | * A hang-up after seeing some response from the other end | |
62 | * means that it is unexpected, as we know the other end is | |
63 | * willing to talk to us. A hang-up before seeing any | |
64 | * response does not necessarily mean an ACL problem, though. | |
65 | */ | |
66 | if (unexpected) | |
67 | die(_("the remote end hung up upon initial contact")); | |
68 | else | |
69 | die(_("Could not read from remote repository.\n\n" | |
70 | "Please make sure you have the correct access rights\n" | |
71 | "and the repository exists.")); | |
72 | } | |
73 | ||
74 | /* Checks if the server supports the capability 'c' */ | |
75 | int server_supports_v2(const char *c) | |
76 | { | |
77 | int i; | |
78 | ||
79 | for (i = 0; i < server_capabilities_v2.nr; i++) { | |
80 | const char *out; | |
81 | if (skip_prefix(server_capabilities_v2.v[i], c, &out) && | |
82 | (!*out || *out == '=')) | |
83 | return 1; | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
88 | void ensure_server_supports_v2(const char *c) | |
89 | { | |
90 | if (!server_supports_v2(c)) | |
91 | die(_("server doesn't support '%s'"), c); | |
92 | } | |
93 | ||
94 | int server_feature_v2(const char *c, const char **v) | |
95 | { | |
96 | int i; | |
97 | ||
98 | for (i = 0; i < server_capabilities_v2.nr; i++) { | |
99 | const char *out; | |
100 | if (skip_prefix(server_capabilities_v2.v[i], c, &out) && | |
101 | (*out == '=')) { | |
102 | *v = out + 1; | |
103 | return 1; | |
104 | } | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
109 | int server_supports_feature(const char *c, const char *feature, | |
110 | int die_on_error) | |
111 | { | |
112 | int i; | |
113 | ||
114 | for (i = 0; i < server_capabilities_v2.nr; i++) { | |
115 | const char *out; | |
116 | if (skip_prefix(server_capabilities_v2.v[i], c, &out) && | |
117 | (!*out || *(out++) == '=')) { | |
118 | if (parse_feature_request(out, feature)) | |
119 | return 1; | |
120 | else | |
121 | break; | |
122 | } | |
123 | } | |
124 | ||
125 | if (die_on_error) | |
126 | die(_("server doesn't support feature '%s'"), feature); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static void process_capabilities_v2(struct packet_reader *reader) | |
132 | { | |
133 | while (packet_reader_read(reader) == PACKET_READ_NORMAL) | |
134 | strvec_push(&server_capabilities_v2, reader->line); | |
135 | ||
136 | if (reader->status != PACKET_READ_FLUSH) | |
137 | die(_("expected flush after capabilities")); | |
138 | } | |
139 | ||
140 | enum protocol_version discover_version(struct packet_reader *reader) | |
141 | { | |
142 | enum protocol_version version = protocol_unknown_version; | |
143 | ||
144 | /* | |
145 | * Peek the first line of the server's response to | |
146 | * determine the protocol version the server is speaking. | |
147 | */ | |
148 | switch (packet_reader_peek(reader)) { | |
149 | case PACKET_READ_EOF: | |
150 | die_initial_contact(0); | |
151 | case PACKET_READ_FLUSH: | |
152 | case PACKET_READ_DELIM: | |
153 | case PACKET_READ_RESPONSE_END: | |
154 | version = protocol_v0; | |
155 | break; | |
156 | case PACKET_READ_NORMAL: | |
157 | version = determine_protocol_version_client(reader->line); | |
158 | break; | |
159 | } | |
160 | ||
161 | switch (version) { | |
162 | case protocol_v2: | |
163 | process_capabilities_v2(reader); | |
164 | break; | |
165 | case protocol_v1: | |
166 | /* Read the peeked version line */ | |
167 | packet_reader_read(reader); | |
168 | break; | |
169 | case protocol_v0: | |
170 | break; | |
171 | case protocol_unknown_version: | |
172 | BUG("unknown protocol version"); | |
173 | } | |
174 | ||
175 | trace2_data_intmax("transfer", NULL, "negotiated-version", version); | |
176 | ||
177 | return version; | |
178 | } | |
179 | ||
180 | static void parse_one_symref_info(struct string_list *symref, const char *val, int len) | |
181 | { | |
182 | char *sym, *target; | |
183 | struct string_list_item *item; | |
184 | ||
185 | if (!len) | |
186 | return; /* just "symref" */ | |
187 | /* e.g. "symref=HEAD:refs/heads/master" */ | |
188 | sym = xmemdupz(val, len); | |
189 | target = strchr(sym, ':'); | |
190 | if (!target) | |
191 | /* just "symref=something" */ | |
192 | goto reject; | |
193 | *(target++) = '\0'; | |
194 | if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) || | |
195 | check_refname_format(target, REFNAME_ALLOW_ONELEVEL)) | |
196 | /* "symref=bogus:pair */ | |
197 | goto reject; | |
198 | item = string_list_append_nodup(symref, sym); | |
199 | item->util = target; | |
200 | return; | |
201 | reject: | |
202 | free(sym); | |
203 | return; | |
204 | } | |
205 | ||
206 | static void annotate_refs_with_symref_info(struct ref *ref) | |
207 | { | |
208 | struct string_list symref = STRING_LIST_INIT_DUP; | |
209 | size_t offset = 0; | |
210 | ||
211 | while (1) { | |
212 | size_t len; | |
213 | const char *val; | |
214 | ||
215 | val = next_server_feature_value("symref", &len, &offset); | |
216 | if (!val) | |
217 | break; | |
218 | parse_one_symref_info(&symref, val, len); | |
219 | } | |
220 | string_list_sort(&symref); | |
221 | ||
222 | for (; ref; ref = ref->next) { | |
223 | struct string_list_item *item; | |
224 | item = string_list_lookup(&symref, ref->name); | |
225 | if (!item) | |
226 | continue; | |
227 | ref->symref = xstrdup((char *)item->util); | |
228 | } | |
229 | string_list_clear(&symref, 0); | |
230 | } | |
231 | ||
232 | static void process_capabilities(struct packet_reader *reader, int *linelen) | |
233 | { | |
234 | const char *feat_val; | |
235 | size_t feat_len; | |
236 | const char *line = reader->line; | |
237 | int nul_location = strlen(line); | |
238 | if (nul_location == *linelen) | |
239 | return; | |
240 | server_capabilities_v1 = xstrdup(line + nul_location + 1); | |
241 | *linelen = nul_location; | |
242 | ||
243 | feat_val = server_feature_value("object-format", &feat_len); | |
244 | if (feat_val) { | |
245 | char *hash_name = xstrndup(feat_val, feat_len); | |
246 | int hash_algo = hash_algo_by_name(hash_name); | |
247 | if (hash_algo != GIT_HASH_UNKNOWN) | |
248 | reader->hash_algo = &hash_algos[hash_algo]; | |
249 | free(hash_name); | |
250 | } else { | |
251 | reader->hash_algo = &hash_algos[GIT_HASH_SHA1]; | |
252 | } | |
253 | } | |
254 | ||
255 | static int process_dummy_ref(const struct packet_reader *reader) | |
256 | { | |
257 | const char *line = reader->line; | |
258 | struct object_id oid; | |
259 | const char *name; | |
260 | ||
261 | if (parse_oid_hex_algop(line, &oid, &name, reader->hash_algo)) | |
262 | return 0; | |
263 | if (*name != ' ') | |
264 | return 0; | |
265 | name++; | |
266 | ||
267 | return oideq(reader->hash_algo->null_oid, &oid) && | |
268 | !strcmp(name, "capabilities^{}"); | |
269 | } | |
270 | ||
271 | static void check_no_capabilities(const char *line, int len) | |
272 | { | |
273 | if (strlen(line) != len) | |
274 | warning(_("ignoring capabilities after first line '%s'"), | |
275 | line + strlen(line)); | |
276 | } | |
277 | ||
278 | static int process_ref(const struct packet_reader *reader, int len, | |
279 | struct ref ***list, unsigned int flags, | |
280 | struct oid_array *extra_have) | |
281 | { | |
282 | const char *line = reader->line; | |
283 | struct object_id old_oid; | |
284 | const char *name; | |
285 | ||
286 | if (parse_oid_hex_algop(line, &old_oid, &name, reader->hash_algo)) | |
287 | return 0; | |
288 | if (*name != ' ') | |
289 | return 0; | |
290 | name++; | |
291 | ||
292 | if (extra_have && !strcmp(name, ".have")) { | |
293 | oid_array_append(extra_have, &old_oid); | |
294 | } else if (!strcmp(name, "capabilities^{}")) { | |
295 | die(_("protocol error: unexpected capabilities^{}")); | |
296 | } else if (check_ref(name, flags)) { | |
297 | struct ref *ref = alloc_ref(name); | |
298 | oidcpy(&ref->old_oid, &old_oid); | |
299 | **list = ref; | |
300 | *list = &ref->next; | |
301 | } | |
302 | check_no_capabilities(line, len); | |
303 | return 1; | |
304 | } | |
305 | ||
306 | static int process_shallow(const struct packet_reader *reader, int len, | |
307 | struct oid_array *shallow_points) | |
308 | { | |
309 | const char *line = reader->line; | |
310 | const char *arg; | |
311 | struct object_id old_oid; | |
312 | ||
313 | if (!skip_prefix(line, "shallow ", &arg)) | |
314 | return 0; | |
315 | ||
316 | if (get_oid_hex_algop(arg, &old_oid, reader->hash_algo)) | |
317 | die(_("protocol error: expected shallow sha-1, got '%s'"), arg); | |
318 | if (!shallow_points) | |
319 | die(_("repository on the other end cannot be shallow")); | |
320 | oid_array_append(shallow_points, &old_oid); | |
321 | check_no_capabilities(line, len); | |
322 | return 1; | |
323 | } | |
324 | ||
325 | enum get_remote_heads_state { | |
326 | EXPECTING_FIRST_REF = 0, | |
327 | EXPECTING_REF, | |
328 | EXPECTING_SHALLOW, | |
329 | EXPECTING_DONE, | |
330 | }; | |
331 | ||
332 | /* | |
333 | * Read all the refs from the other end | |
334 | */ | |
335 | struct ref **get_remote_heads(struct packet_reader *reader, | |
336 | struct ref **list, unsigned int flags, | |
337 | struct oid_array *extra_have, | |
338 | struct oid_array *shallow_points) | |
339 | { | |
340 | struct ref **orig_list = list; | |
341 | int len = 0; | |
342 | enum get_remote_heads_state state = EXPECTING_FIRST_REF; | |
343 | ||
344 | *list = NULL; | |
345 | ||
346 | while (state != EXPECTING_DONE) { | |
347 | switch (packet_reader_read(reader)) { | |
348 | case PACKET_READ_EOF: | |
349 | die_initial_contact(1); | |
350 | case PACKET_READ_NORMAL: | |
351 | len = reader->pktlen; | |
352 | break; | |
353 | case PACKET_READ_FLUSH: | |
354 | state = EXPECTING_DONE; | |
355 | break; | |
356 | case PACKET_READ_DELIM: | |
357 | case PACKET_READ_RESPONSE_END: | |
358 | die(_("invalid packet")); | |
359 | } | |
360 | ||
361 | switch (state) { | |
362 | case EXPECTING_FIRST_REF: | |
363 | process_capabilities(reader, &len); | |
364 | if (process_dummy_ref(reader)) { | |
365 | state = EXPECTING_SHALLOW; | |
366 | break; | |
367 | } | |
368 | state = EXPECTING_REF; | |
369 | /* fallthrough */ | |
370 | case EXPECTING_REF: | |
371 | if (process_ref(reader, len, &list, flags, extra_have)) | |
372 | break; | |
373 | state = EXPECTING_SHALLOW; | |
374 | /* fallthrough */ | |
375 | case EXPECTING_SHALLOW: | |
376 | if (process_shallow(reader, len, shallow_points)) | |
377 | break; | |
378 | die(_("protocol error: unexpected '%s'"), reader->line); | |
379 | case EXPECTING_DONE: | |
380 | break; | |
381 | } | |
382 | } | |
383 | ||
384 | annotate_refs_with_symref_info(*orig_list); | |
385 | ||
386 | return list; | |
387 | } | |
388 | ||
389 | /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */ | |
390 | static int process_ref_v2(struct packet_reader *reader, struct ref ***list, | |
391 | const char **unborn_head_target) | |
392 | { | |
393 | int ret = 1; | |
394 | int i = 0; | |
395 | struct object_id old_oid; | |
396 | struct ref *ref; | |
397 | struct string_list line_sections = STRING_LIST_INIT_DUP; | |
398 | const char *end; | |
399 | const char *line = reader->line; | |
400 | ||
401 | /* | |
402 | * Ref lines have a number of fields which are space deliminated. The | |
403 | * first field is the OID of the ref. The second field is the ref | |
404 | * name. Subsequent fields (symref-target and peeled) are optional and | |
405 | * don't have a particular order. | |
406 | */ | |
407 | if (string_list_split(&line_sections, line, ' ', -1) < 2) { | |
408 | ret = 0; | |
409 | goto out; | |
410 | } | |
411 | ||
412 | if (!strcmp("unborn", line_sections.items[i].string)) { | |
413 | i++; | |
414 | if (unborn_head_target && | |
415 | !strcmp("HEAD", line_sections.items[i++].string)) { | |
416 | /* | |
417 | * Look for the symref target (if any). If found, | |
418 | * return it to the caller. | |
419 | */ | |
420 | for (; i < line_sections.nr; i++) { | |
421 | const char *arg = line_sections.items[i].string; | |
422 | ||
423 | if (skip_prefix(arg, "symref-target:", &arg)) { | |
424 | *unborn_head_target = xstrdup(arg); | |
425 | break; | |
426 | } | |
427 | } | |
428 | } | |
429 | goto out; | |
430 | } | |
431 | if (parse_oid_hex_algop(line_sections.items[i++].string, &old_oid, &end, reader->hash_algo) || | |
432 | *end) { | |
433 | ret = 0; | |
434 | goto out; | |
435 | } | |
436 | ||
437 | ref = alloc_ref(line_sections.items[i++].string); | |
438 | ||
439 | memcpy(ref->old_oid.hash, old_oid.hash, reader->hash_algo->rawsz); | |
440 | **list = ref; | |
441 | *list = &ref->next; | |
442 | ||
443 | for (; i < line_sections.nr; i++) { | |
444 | const char *arg = line_sections.items[i].string; | |
445 | if (skip_prefix(arg, "symref-target:", &arg)) | |
446 | ref->symref = xstrdup(arg); | |
447 | ||
448 | if (skip_prefix(arg, "peeled:", &arg)) { | |
449 | struct object_id peeled_oid; | |
450 | char *peeled_name; | |
451 | struct ref *peeled; | |
452 | if (parse_oid_hex_algop(arg, &peeled_oid, &end, | |
453 | reader->hash_algo) || *end) { | |
454 | ret = 0; | |
455 | goto out; | |
456 | } | |
457 | ||
458 | peeled_name = xstrfmt("%s^{}", ref->name); | |
459 | peeled = alloc_ref(peeled_name); | |
460 | ||
461 | memcpy(peeled->old_oid.hash, peeled_oid.hash, | |
462 | reader->hash_algo->rawsz); | |
463 | **list = peeled; | |
464 | *list = &peeled->next; | |
465 | ||
466 | free(peeled_name); | |
467 | } | |
468 | } | |
469 | ||
470 | out: | |
471 | string_list_clear(&line_sections, 0); | |
472 | return ret; | |
473 | } | |
474 | ||
475 | void check_stateless_delimiter(int stateless_rpc, | |
476 | struct packet_reader *reader, | |
477 | const char *error) | |
478 | { | |
479 | if (!stateless_rpc) | |
480 | return; /* not in stateless mode, no delimiter expected */ | |
481 | if (packet_reader_read(reader) != PACKET_READ_RESPONSE_END) | |
482 | die("%s", error); | |
483 | } | |
484 | ||
485 | static void send_capabilities(int fd_out, struct packet_reader *reader) | |
486 | { | |
487 | const char *hash_name; | |
488 | ||
489 | if (server_supports_v2("agent")) | |
490 | packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized()); | |
491 | ||
492 | if (server_feature_v2("object-format", &hash_name)) { | |
493 | int hash_algo = hash_algo_by_name(hash_name); | |
494 | if (hash_algo == GIT_HASH_UNKNOWN) | |
495 | die(_("unknown object format '%s' specified by server"), hash_name); | |
496 | reader->hash_algo = &hash_algos[hash_algo]; | |
497 | packet_write_fmt(fd_out, "object-format=%s", reader->hash_algo->name); | |
498 | } else { | |
499 | reader->hash_algo = &hash_algos[GIT_HASH_SHA1]; | |
500 | } | |
501 | } | |
502 | ||
503 | int get_remote_bundle_uri(int fd_out, struct packet_reader *reader, | |
504 | struct bundle_list *bundles, int stateless_rpc) | |
505 | { | |
506 | int line_nr = 1; | |
507 | ||
508 | /* Assert bundle-uri support */ | |
509 | ensure_server_supports_v2("bundle-uri"); | |
510 | ||
511 | /* (Re-)send capabilities */ | |
512 | send_capabilities(fd_out, reader); | |
513 | ||
514 | /* Send command */ | |
515 | packet_write_fmt(fd_out, "command=bundle-uri\n"); | |
516 | packet_delim(fd_out); | |
517 | ||
518 | packet_flush(fd_out); | |
519 | ||
520 | /* Process response from server */ | |
521 | while (packet_reader_read(reader) == PACKET_READ_NORMAL) { | |
522 | const char *line = reader->line; | |
523 | line_nr++; | |
524 | ||
525 | if (!bundle_uri_parse_line(bundles, line)) | |
526 | continue; | |
527 | ||
528 | return error(_("error on bundle-uri response line %d: %s"), | |
529 | line_nr, line); | |
530 | } | |
531 | ||
532 | if (reader->status != PACKET_READ_FLUSH) | |
533 | return error(_("expected flush after bundle-uri listing")); | |
534 | ||
535 | /* | |
536 | * Might die(), but obscure enough that that's OK, e.g. in | |
537 | * serve.c we'll call BUG() on its equivalent (the | |
538 | * PACKET_READ_RESPONSE_END check). | |
539 | */ | |
540 | check_stateless_delimiter(stateless_rpc, reader, | |
541 | _("expected response end packet after ref listing")); | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
546 | struct ref **get_remote_refs(int fd_out, struct packet_reader *reader, | |
547 | struct ref **list, int for_push, | |
548 | struct transport_ls_refs_options *transport_options, | |
549 | const struct string_list *server_options, | |
550 | int stateless_rpc) | |
551 | { | |
552 | int i; | |
553 | struct strvec *ref_prefixes = transport_options ? | |
554 | &transport_options->ref_prefixes : NULL; | |
555 | const char **unborn_head_target = transport_options ? | |
556 | &transport_options->unborn_head_target : NULL; | |
557 | *list = NULL; | |
558 | ||
559 | ensure_server_supports_v2("ls-refs"); | |
560 | packet_write_fmt(fd_out, "command=ls-refs\n"); | |
561 | ||
562 | /* Send capabilities */ | |
563 | send_capabilities(fd_out, reader); | |
564 | ||
565 | if (server_options && server_options->nr) { | |
566 | ensure_server_supports_v2("server-option"); | |
567 | for (i = 0; i < server_options->nr; i++) | |
568 | packet_write_fmt(fd_out, "server-option=%s", | |
569 | server_options->items[i].string); | |
570 | } | |
571 | ||
572 | packet_delim(fd_out); | |
573 | /* When pushing we don't want to request the peeled tags */ | |
574 | if (!for_push) | |
575 | packet_write_fmt(fd_out, "peel\n"); | |
576 | packet_write_fmt(fd_out, "symrefs\n"); | |
577 | if (server_supports_feature("ls-refs", "unborn", 0)) | |
578 | packet_write_fmt(fd_out, "unborn\n"); | |
579 | for (i = 0; ref_prefixes && i < ref_prefixes->nr; i++) { | |
580 | packet_write_fmt(fd_out, "ref-prefix %s\n", | |
581 | ref_prefixes->v[i]); | |
582 | } | |
583 | packet_flush(fd_out); | |
584 | ||
585 | /* Process response from server */ | |
586 | while (packet_reader_read(reader) == PACKET_READ_NORMAL) { | |
587 | if (!process_ref_v2(reader, &list, unborn_head_target)) | |
588 | die(_("invalid ls-refs response: %s"), reader->line); | |
589 | } | |
590 | ||
591 | if (reader->status != PACKET_READ_FLUSH) | |
592 | die(_("expected flush after ref listing")); | |
593 | ||
594 | check_stateless_delimiter(stateless_rpc, reader, | |
595 | _("expected response end packet after ref listing")); | |
596 | ||
597 | return list; | |
598 | } | |
599 | ||
600 | const char *parse_feature_value(const char *feature_list, const char *feature, size_t *lenp, size_t *offset) | |
601 | { | |
602 | const char *orig_start = feature_list; | |
603 | size_t len; | |
604 | ||
605 | if (!feature_list) | |
606 | return NULL; | |
607 | ||
608 | len = strlen(feature); | |
609 | if (offset) | |
610 | feature_list += *offset; | |
611 | while (*feature_list) { | |
612 | const char *found = strstr(feature_list, feature); | |
613 | if (!found) | |
614 | return NULL; | |
615 | if (feature_list == found || isspace(found[-1])) { | |
616 | const char *value = found + len; | |
617 | /* feature with no value (e.g., "thin-pack") */ | |
618 | if (!*value || isspace(*value)) { | |
619 | if (lenp) | |
620 | *lenp = 0; | |
621 | if (offset) | |
622 | *offset = found + len - orig_start; | |
623 | return value; | |
624 | } | |
625 | /* feature with a value (e.g., "agent=git/1.2.3") */ | |
626 | else if (*value == '=') { | |
627 | size_t end; | |
628 | ||
629 | value++; | |
630 | end = strcspn(value, " \t\n"); | |
631 | if (lenp) | |
632 | *lenp = end; | |
633 | if (offset) | |
634 | *offset = value + end - orig_start; | |
635 | return value; | |
636 | } | |
637 | /* | |
638 | * otherwise we matched a substring of another feature; | |
639 | * keep looking | |
640 | */ | |
641 | } | |
642 | feature_list = found + 1; | |
643 | } | |
644 | return NULL; | |
645 | } | |
646 | ||
647 | int server_supports_hash(const char *desired, int *feature_supported) | |
648 | { | |
649 | size_t offset = 0; | |
650 | size_t len; | |
651 | const char *hash; | |
652 | ||
653 | hash = next_server_feature_value("object-format", &len, &offset); | |
654 | if (feature_supported) | |
655 | *feature_supported = !!hash; | |
656 | if (!hash) { | |
657 | hash = hash_algos[GIT_HASH_SHA1].name; | |
658 | len = strlen(hash); | |
659 | } | |
660 | while (hash) { | |
661 | if (!xstrncmpz(desired, hash, len)) | |
662 | return 1; | |
663 | ||
664 | hash = next_server_feature_value("object-format", &len, &offset); | |
665 | } | |
666 | return 0; | |
667 | } | |
668 | ||
669 | int parse_feature_request(const char *feature_list, const char *feature) | |
670 | { | |
671 | return !!parse_feature_value(feature_list, feature, NULL, NULL); | |
672 | } | |
673 | ||
674 | static const char *next_server_feature_value(const char *feature, size_t *len, size_t *offset) | |
675 | { | |
676 | return parse_feature_value(server_capabilities_v1, feature, len, offset); | |
677 | } | |
678 | ||
679 | const char *server_feature_value(const char *feature, size_t *len) | |
680 | { | |
681 | return parse_feature_value(server_capabilities_v1, feature, len, NULL); | |
682 | } | |
683 | ||
684 | int server_supports(const char *feature) | |
685 | { | |
686 | return !!server_feature_value(feature, NULL); | |
687 | } | |
688 | ||
689 | enum protocol { | |
690 | PROTO_LOCAL = 1, | |
691 | PROTO_FILE, | |
692 | PROTO_SSH, | |
693 | PROTO_GIT | |
694 | }; | |
695 | ||
696 | int url_is_local_not_ssh(const char *url) | |
697 | { | |
698 | const char *colon = strchr(url, ':'); | |
699 | const char *slash = strchr(url, '/'); | |
700 | return !colon || (slash && slash < colon) || | |
701 | (has_dos_drive_prefix(url) && is_valid_path(url)); | |
702 | } | |
703 | ||
704 | static const char *prot_name(enum protocol protocol) | |
705 | { | |
706 | switch (protocol) { | |
707 | case PROTO_LOCAL: | |
708 | case PROTO_FILE: | |
709 | return "file"; | |
710 | case PROTO_SSH: | |
711 | return "ssh"; | |
712 | case PROTO_GIT: | |
713 | return "git"; | |
714 | default: | |
715 | return "unknown protocol"; | |
716 | } | |
717 | } | |
718 | ||
719 | static enum protocol get_protocol(const char *name) | |
720 | { | |
721 | if (!strcmp(name, "ssh")) | |
722 | return PROTO_SSH; | |
723 | if (!strcmp(name, "git")) | |
724 | return PROTO_GIT; | |
725 | if (!strcmp(name, "git+ssh")) /* deprecated - do not use */ | |
726 | return PROTO_SSH; | |
727 | if (!strcmp(name, "ssh+git")) /* deprecated - do not use */ | |
728 | return PROTO_SSH; | |
729 | if (!strcmp(name, "file")) | |
730 | return PROTO_FILE; | |
731 | die(_("protocol '%s' is not supported"), name); | |
732 | } | |
733 | ||
734 | static char *host_end(char **hoststart, int removebrackets) | |
735 | { | |
736 | char *host = *hoststart; | |
737 | char *end; | |
738 | char *start = strstr(host, "@["); | |
739 | if (start) | |
740 | start++; /* Jump over '@' */ | |
741 | else | |
742 | start = host; | |
743 | if (start[0] == '[') { | |
744 | end = strchr(start + 1, ']'); | |
745 | if (end) { | |
746 | if (removebrackets) { | |
747 | *end = 0; | |
748 | memmove(start, start + 1, end - start); | |
749 | end++; | |
750 | } | |
751 | } else | |
752 | end = host; | |
753 | } else | |
754 | end = host; | |
755 | return end; | |
756 | } | |
757 | ||
758 | #define STR_(s) # s | |
759 | #define STR(s) STR_(s) | |
760 | ||
761 | static void get_host_and_port(char **host, const char **port) | |
762 | { | |
763 | char *colon, *end; | |
764 | end = host_end(host, 1); | |
765 | colon = strchr(end, ':'); | |
766 | if (colon) { | |
767 | long portnr = strtol(colon + 1, &end, 10); | |
768 | if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) { | |
769 | *colon = 0; | |
770 | *port = colon + 1; | |
771 | } else if (!colon[1]) { | |
772 | *colon = 0; | |
773 | } | |
774 | } | |
775 | } | |
776 | ||
777 | static void enable_keepalive(int sockfd) | |
778 | { | |
779 | int ka = 1; | |
780 | ||
781 | if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) | |
782 | error_errno(_("unable to set SO_KEEPALIVE on socket")); | |
783 | } | |
784 | ||
785 | #ifndef NO_IPV6 | |
786 | ||
787 | static const char *ai_name(const struct addrinfo *ai) | |
788 | { | |
789 | static char addr[NI_MAXHOST]; | |
790 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0, | |
791 | NI_NUMERICHOST) != 0) | |
792 | xsnprintf(addr, sizeof(addr), "(unknown)"); | |
793 | ||
794 | return addr; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Returns a connected socket() fd, or else die()s. | |
799 | */ | |
800 | static int git_tcp_connect_sock(char *host, int flags) | |
801 | { | |
802 | struct strbuf error_message = STRBUF_INIT; | |
803 | int sockfd = -1; | |
804 | const char *port = STR(DEFAULT_GIT_PORT); | |
805 | struct addrinfo hints, *ai0, *ai; | |
806 | int gai; | |
807 | int cnt = 0; | |
808 | ||
809 | get_host_and_port(&host, &port); | |
810 | if (!*port) | |
811 | port = "<none>"; | |
812 | ||
813 | memset(&hints, 0, sizeof(hints)); | |
814 | if (flags & CONNECT_IPV4) | |
815 | hints.ai_family = AF_INET; | |
816 | else if (flags & CONNECT_IPV6) | |
817 | hints.ai_family = AF_INET6; | |
818 | hints.ai_socktype = SOCK_STREAM; | |
819 | hints.ai_protocol = IPPROTO_TCP; | |
820 | ||
821 | if (flags & CONNECT_VERBOSE) | |
822 | fprintf(stderr, _("Looking up %s ... "), host); | |
823 | ||
824 | gai = getaddrinfo(host, port, &hints, &ai); | |
825 | if (gai) | |
826 | die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai)); | |
827 | ||
828 | if (flags & CONNECT_VERBOSE) | |
829 | /* TRANSLATORS: this is the end of "Looking up %s ... " */ | |
830 | fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port); | |
831 | ||
832 | for (ai0 = ai; ai; ai = ai->ai_next, cnt++) { | |
833 | sockfd = socket(ai->ai_family, | |
834 | ai->ai_socktype, ai->ai_protocol); | |
835 | if ((sockfd < 0) || | |
836 | (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) { | |
837 | strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n", | |
838 | host, cnt, ai_name(ai), strerror(errno)); | |
839 | if (0 <= sockfd) | |
840 | close(sockfd); | |
841 | sockfd = -1; | |
842 | continue; | |
843 | } | |
844 | if (flags & CONNECT_VERBOSE) | |
845 | fprintf(stderr, "%s ", ai_name(ai)); | |
846 | break; | |
847 | } | |
848 | ||
849 | freeaddrinfo(ai0); | |
850 | ||
851 | if (sockfd < 0) | |
852 | die(_("unable to connect to %s:\n%s"), host, error_message.buf); | |
853 | ||
854 | enable_keepalive(sockfd); | |
855 | ||
856 | if (flags & CONNECT_VERBOSE) | |
857 | /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */ | |
858 | fprintf_ln(stderr, _("done.")); | |
859 | ||
860 | strbuf_release(&error_message); | |
861 | ||
862 | return sockfd; | |
863 | } | |
864 | ||
865 | #else /* NO_IPV6 */ | |
866 | ||
867 | /* | |
868 | * Returns a connected socket() fd, or else die()s. | |
869 | */ | |
870 | static int git_tcp_connect_sock(char *host, int flags) | |
871 | { | |
872 | struct strbuf error_message = STRBUF_INIT; | |
873 | int sockfd = -1; | |
874 | const char *port = STR(DEFAULT_GIT_PORT); | |
875 | char *ep; | |
876 | struct hostent *he; | |
877 | struct sockaddr_in sa; | |
878 | char **ap; | |
879 | unsigned int nport; | |
880 | int cnt; | |
881 | ||
882 | get_host_and_port(&host, &port); | |
883 | ||
884 | if (flags & CONNECT_VERBOSE) | |
885 | fprintf(stderr, _("Looking up %s ... "), host); | |
886 | ||
887 | he = gethostbyname(host); | |
888 | if (!he) | |
889 | die(_("unable to look up %s (%s)"), host, hstrerror(h_errno)); | |
890 | nport = strtoul(port, &ep, 10); | |
891 | if ( ep == port || *ep ) { | |
892 | /* Not numeric */ | |
893 | struct servent *se = getservbyname(port,"tcp"); | |
894 | if ( !se ) | |
895 | die(_("unknown port %s"), port); | |
896 | nport = se->s_port; | |
897 | } | |
898 | ||
899 | if (flags & CONNECT_VERBOSE) | |
900 | /* TRANSLATORS: this is the end of "Looking up %s ... " */ | |
901 | fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port); | |
902 | ||
903 | for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) { | |
904 | memset(&sa, 0, sizeof sa); | |
905 | sa.sin_family = he->h_addrtype; | |
906 | sa.sin_port = htons(nport); | |
907 | memcpy(&sa.sin_addr, *ap, he->h_length); | |
908 | ||
909 | sockfd = socket(he->h_addrtype, SOCK_STREAM, 0); | |
910 | if ((sockfd < 0) || | |
911 | connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) { | |
912 | strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n", | |
913 | host, | |
914 | cnt, | |
915 | inet_ntoa(*(struct in_addr *)&sa.sin_addr), | |
916 | strerror(errno)); | |
917 | if (0 <= sockfd) | |
918 | close(sockfd); | |
919 | sockfd = -1; | |
920 | continue; | |
921 | } | |
922 | if (flags & CONNECT_VERBOSE) | |
923 | fprintf(stderr, "%s ", | |
924 | inet_ntoa(*(struct in_addr *)&sa.sin_addr)); | |
925 | break; | |
926 | } | |
927 | ||
928 | if (sockfd < 0) | |
929 | die(_("unable to connect to %s:\n%s"), host, error_message.buf); | |
930 | ||
931 | enable_keepalive(sockfd); | |
932 | ||
933 | if (flags & CONNECT_VERBOSE) | |
934 | /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */ | |
935 | fprintf_ln(stderr, _("done.")); | |
936 | ||
937 | return sockfd; | |
938 | } | |
939 | ||
940 | #endif /* NO_IPV6 */ | |
941 | ||
942 | ||
943 | /* | |
944 | * Dummy child_process returned by git_connect() if the transport protocol | |
945 | * does not need fork(2). | |
946 | */ | |
947 | static struct child_process no_fork = CHILD_PROCESS_INIT; | |
948 | ||
949 | int git_connection_is_socket(struct child_process *conn) | |
950 | { | |
951 | return conn == &no_fork; | |
952 | } | |
953 | ||
954 | static struct child_process *git_tcp_connect(int fd[2], char *host, int flags) | |
955 | { | |
956 | int sockfd = git_tcp_connect_sock(host, flags); | |
957 | ||
958 | fd[0] = sockfd; | |
959 | fd[1] = dup(sockfd); | |
960 | ||
961 | return &no_fork; | |
962 | } | |
963 | ||
964 | ||
965 | static char *git_proxy_command; | |
966 | ||
967 | static int git_proxy_command_options(const char *var, const char *value, | |
968 | const struct config_context *ctx, void *cb) | |
969 | { | |
970 | if (!strcmp(var, "core.gitproxy")) { | |
971 | const char *for_pos; | |
972 | int matchlen = -1; | |
973 | int hostlen; | |
974 | const char *rhost_name = cb; | |
975 | int rhost_len = strlen(rhost_name); | |
976 | ||
977 | if (git_proxy_command) | |
978 | return 0; | |
979 | if (!value) | |
980 | return config_error_nonbool(var); | |
981 | /* [core] | |
982 | * ;# matches www.kernel.org as well | |
983 | * gitproxy = netcatter-1 for kernel.org | |
984 | * gitproxy = netcatter-2 for sample.xz | |
985 | * gitproxy = netcatter-default | |
986 | */ | |
987 | for_pos = strstr(value, " for "); | |
988 | if (!for_pos) | |
989 | /* matches everybody */ | |
990 | matchlen = strlen(value); | |
991 | else { | |
992 | hostlen = strlen(for_pos + 5); | |
993 | if (rhost_len < hostlen) | |
994 | matchlen = -1; | |
995 | else if (!strncmp(for_pos + 5, | |
996 | rhost_name + rhost_len - hostlen, | |
997 | hostlen) && | |
998 | ((rhost_len == hostlen) || | |
999 | rhost_name[rhost_len - hostlen -1] == '.')) | |
1000 | matchlen = for_pos - value; | |
1001 | else | |
1002 | matchlen = -1; | |
1003 | } | |
1004 | if (0 <= matchlen) { | |
1005 | /* core.gitproxy = none for kernel.org */ | |
1006 | if (matchlen == 4 && | |
1007 | !memcmp(value, "none", 4)) | |
1008 | matchlen = 0; | |
1009 | git_proxy_command = xmemdupz(value, matchlen); | |
1010 | } | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | return git_default_config(var, value, ctx, cb); | |
1015 | } | |
1016 | ||
1017 | static int git_use_proxy(const char *host) | |
1018 | { | |
1019 | git_proxy_command = getenv("GIT_PROXY_COMMAND"); | |
1020 | git_config(git_proxy_command_options, (void*)host); | |
1021 | return (git_proxy_command && *git_proxy_command); | |
1022 | } | |
1023 | ||
1024 | static struct child_process *git_proxy_connect(int fd[2], char *host) | |
1025 | { | |
1026 | const char *port = STR(DEFAULT_GIT_PORT); | |
1027 | struct child_process *proxy; | |
1028 | ||
1029 | get_host_and_port(&host, &port); | |
1030 | ||
1031 | if (looks_like_command_line_option(host)) | |
1032 | die(_("strange hostname '%s' blocked"), host); | |
1033 | if (looks_like_command_line_option(port)) | |
1034 | die(_("strange port '%s' blocked"), port); | |
1035 | ||
1036 | proxy = xmalloc(sizeof(*proxy)); | |
1037 | child_process_init(proxy); | |
1038 | strvec_push(&proxy->args, git_proxy_command); | |
1039 | strvec_push(&proxy->args, host); | |
1040 | strvec_push(&proxy->args, port); | |
1041 | proxy->in = -1; | |
1042 | proxy->out = -1; | |
1043 | if (start_command(proxy)) | |
1044 | die(_("cannot start proxy %s"), git_proxy_command); | |
1045 | fd[0] = proxy->out; /* read from proxy stdout */ | |
1046 | fd[1] = proxy->in; /* write to proxy stdin */ | |
1047 | return proxy; | |
1048 | } | |
1049 | ||
1050 | static char *get_port(char *host) | |
1051 | { | |
1052 | char *end; | |
1053 | char *p = strchr(host, ':'); | |
1054 | ||
1055 | if (p) { | |
1056 | long port = strtol(p + 1, &end, 10); | |
1057 | if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) { | |
1058 | *p = '\0'; | |
1059 | return p+1; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | return NULL; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Extract protocol and relevant parts from the specified connection URL. | |
1068 | * The caller must free() the returned strings. | |
1069 | */ | |
1070 | static enum protocol parse_connect_url(const char *url_orig, char **ret_host, | |
1071 | char **ret_path) | |
1072 | { | |
1073 | char *url; | |
1074 | char *host, *path; | |
1075 | char *end; | |
1076 | int separator = '/'; | |
1077 | enum protocol protocol = PROTO_LOCAL; | |
1078 | ||
1079 | if (is_url(url_orig)) | |
1080 | url = url_decode(url_orig); | |
1081 | else | |
1082 | url = xstrdup(url_orig); | |
1083 | ||
1084 | host = strstr(url, "://"); | |
1085 | if (host) { | |
1086 | *host = '\0'; | |
1087 | protocol = get_protocol(url); | |
1088 | host += 3; | |
1089 | } else { | |
1090 | host = url; | |
1091 | if (!url_is_local_not_ssh(url)) { | |
1092 | protocol = PROTO_SSH; | |
1093 | separator = ':'; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * Don't do destructive transforms as protocol code does | |
1099 | * '[]' unwrapping in get_host_and_port() | |
1100 | */ | |
1101 | end = host_end(&host, 0); | |
1102 | ||
1103 | if (protocol == PROTO_LOCAL) | |
1104 | path = end; | |
1105 | else if (protocol == PROTO_FILE && *host != '/' && | |
1106 | !has_dos_drive_prefix(host) && | |
1107 | offset_1st_component(host - 2) > 1) | |
1108 | path = host - 2; /* include the leading "//" */ | |
1109 | else if (protocol == PROTO_FILE && has_dos_drive_prefix(end)) | |
1110 | path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */ | |
1111 | else | |
1112 | path = strchr(end, separator); | |
1113 | ||
1114 | if (!path || !*path) | |
1115 | die(_("no path specified; see 'git help pull' for valid url syntax")); | |
1116 | ||
1117 | /* | |
1118 | * null-terminate hostname and point path to ~ for URL's like this: | |
1119 | * ssh://host.xz/~user/repo | |
1120 | */ | |
1121 | ||
1122 | end = path; /* Need to \0 terminate host here */ | |
1123 | if (separator == ':') | |
1124 | path++; /* path starts after ':' */ | |
1125 | if (protocol == PROTO_GIT || protocol == PROTO_SSH) { | |
1126 | if (path[1] == '~') | |
1127 | path++; | |
1128 | } | |
1129 | ||
1130 | path = xstrdup(path); | |
1131 | *end = '\0'; | |
1132 | ||
1133 | *ret_host = xstrdup(host); | |
1134 | *ret_path = path; | |
1135 | free(url); | |
1136 | return protocol; | |
1137 | } | |
1138 | ||
1139 | static const char *get_ssh_command(void) | |
1140 | { | |
1141 | const char *ssh; | |
1142 | ||
1143 | if ((ssh = getenv("GIT_SSH_COMMAND"))) | |
1144 | return ssh; | |
1145 | ||
1146 | if (!git_config_get_string_tmp("core.sshcommand", &ssh)) | |
1147 | return ssh; | |
1148 | ||
1149 | return NULL; | |
1150 | } | |
1151 | ||
1152 | enum ssh_variant { | |
1153 | VARIANT_AUTO, | |
1154 | VARIANT_SIMPLE, | |
1155 | VARIANT_SSH, | |
1156 | VARIANT_PLINK, | |
1157 | VARIANT_PUTTY, | |
1158 | VARIANT_TORTOISEPLINK, | |
1159 | }; | |
1160 | ||
1161 | static void override_ssh_variant(enum ssh_variant *ssh_variant) | |
1162 | { | |
1163 | const char *variant = getenv("GIT_SSH_VARIANT"); | |
1164 | ||
1165 | if (!variant && git_config_get_string_tmp("ssh.variant", &variant)) | |
1166 | return; | |
1167 | ||
1168 | if (!strcmp(variant, "auto")) | |
1169 | *ssh_variant = VARIANT_AUTO; | |
1170 | else if (!strcmp(variant, "plink")) | |
1171 | *ssh_variant = VARIANT_PLINK; | |
1172 | else if (!strcmp(variant, "putty")) | |
1173 | *ssh_variant = VARIANT_PUTTY; | |
1174 | else if (!strcmp(variant, "tortoiseplink")) | |
1175 | *ssh_variant = VARIANT_TORTOISEPLINK; | |
1176 | else if (!strcmp(variant, "simple")) | |
1177 | *ssh_variant = VARIANT_SIMPLE; | |
1178 | else | |
1179 | *ssh_variant = VARIANT_SSH; | |
1180 | } | |
1181 | ||
1182 | static enum ssh_variant determine_ssh_variant(const char *ssh_command, | |
1183 | int is_cmdline) | |
1184 | { | |
1185 | enum ssh_variant ssh_variant = VARIANT_AUTO; | |
1186 | const char *variant; | |
1187 | char *p = NULL; | |
1188 | ||
1189 | override_ssh_variant(&ssh_variant); | |
1190 | ||
1191 | if (ssh_variant != VARIANT_AUTO) | |
1192 | return ssh_variant; | |
1193 | ||
1194 | if (!is_cmdline) { | |
1195 | p = xstrdup(ssh_command); | |
1196 | variant = basename(p); | |
1197 | } else { | |
1198 | const char **ssh_argv; | |
1199 | ||
1200 | p = xstrdup(ssh_command); | |
1201 | if (split_cmdline(p, &ssh_argv) > 0) { | |
1202 | variant = basename((char *)ssh_argv[0]); | |
1203 | /* | |
1204 | * At this point, variant points into the buffer | |
1205 | * referenced by p, hence we do not need ssh_argv | |
1206 | * any longer. | |
1207 | */ | |
1208 | free(ssh_argv); | |
1209 | } else { | |
1210 | free(p); | |
1211 | return ssh_variant; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | if (!strcasecmp(variant, "ssh") || | |
1216 | !strcasecmp(variant, "ssh.exe")) | |
1217 | ssh_variant = VARIANT_SSH; | |
1218 | else if (!strcasecmp(variant, "plink") || | |
1219 | !strcasecmp(variant, "plink.exe")) | |
1220 | ssh_variant = VARIANT_PLINK; | |
1221 | else if (!strcasecmp(variant, "tortoiseplink") || | |
1222 | !strcasecmp(variant, "tortoiseplink.exe")) | |
1223 | ssh_variant = VARIANT_TORTOISEPLINK; | |
1224 | ||
1225 | free(p); | |
1226 | return ssh_variant; | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * Open a connection using Git's native protocol. | |
1231 | * | |
1232 | * The caller is responsible for freeing hostandport, but this function may | |
1233 | * modify it (for example, to truncate it to remove the port part). | |
1234 | */ | |
1235 | static struct child_process *git_connect_git(int fd[2], char *hostandport, | |
1236 | const char *path, const char *prog, | |
1237 | enum protocol_version version, | |
1238 | int flags) | |
1239 | { | |
1240 | struct child_process *conn; | |
1241 | struct strbuf request = STRBUF_INIT; | |
1242 | /* | |
1243 | * Set up virtual host information based on where we will | |
1244 | * connect, unless the user has overridden us in | |
1245 | * the environment. | |
1246 | */ | |
1247 | char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST"); | |
1248 | if (target_host) | |
1249 | target_host = xstrdup(target_host); | |
1250 | else | |
1251 | target_host = xstrdup(hostandport); | |
1252 | ||
1253 | transport_check_allowed("git"); | |
1254 | if (strchr(target_host, '\n') || strchr(path, '\n')) | |
1255 | die(_("newline is forbidden in git:// hosts and repo paths")); | |
1256 | ||
1257 | /* | |
1258 | * These underlying connection commands die() if they | |
1259 | * cannot connect. | |
1260 | */ | |
1261 | if (git_use_proxy(hostandport)) | |
1262 | conn = git_proxy_connect(fd, hostandport); | |
1263 | else | |
1264 | conn = git_tcp_connect(fd, hostandport, flags); | |
1265 | /* | |
1266 | * Separate original protocol components prog and path | |
1267 | * from extended host header with a NUL byte. | |
1268 | * | |
1269 | * Note: Do not add any other headers here! Doing so | |
1270 | * will cause older git-daemon servers to crash. | |
1271 | */ | |
1272 | strbuf_addf(&request, | |
1273 | "%s %s%chost=%s%c", | |
1274 | prog, path, 0, | |
1275 | target_host, 0); | |
1276 | ||
1277 | /* If using a new version put that stuff here after a second null byte */ | |
1278 | if (version > 0) { | |
1279 | strbuf_addch(&request, '\0'); | |
1280 | strbuf_addf(&request, "version=%d%c", | |
1281 | version, '\0'); | |
1282 | } | |
1283 | ||
1284 | packet_write(fd[1], request.buf, request.len); | |
1285 | ||
1286 | free(target_host); | |
1287 | strbuf_release(&request); | |
1288 | return conn; | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Append the appropriate environment variables to `env` and options to | |
1293 | * `args` for running ssh in Git's SSH-tunneled transport. | |
1294 | */ | |
1295 | static void push_ssh_options(struct strvec *args, struct strvec *env, | |
1296 | enum ssh_variant variant, const char *port, | |
1297 | enum protocol_version version, int flags) | |
1298 | { | |
1299 | if (variant == VARIANT_SSH && | |
1300 | version > 0) { | |
1301 | strvec_push(args, "-o"); | |
1302 | strvec_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT); | |
1303 | strvec_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d", | |
1304 | version); | |
1305 | } | |
1306 | ||
1307 | if (flags & CONNECT_IPV4) { | |
1308 | switch (variant) { | |
1309 | case VARIANT_AUTO: | |
1310 | BUG("VARIANT_AUTO passed to push_ssh_options"); | |
1311 | case VARIANT_SIMPLE: | |
1312 | die(_("ssh variant 'simple' does not support -4")); | |
1313 | case VARIANT_SSH: | |
1314 | case VARIANT_PLINK: | |
1315 | case VARIANT_PUTTY: | |
1316 | case VARIANT_TORTOISEPLINK: | |
1317 | strvec_push(args, "-4"); | |
1318 | } | |
1319 | } else if (flags & CONNECT_IPV6) { | |
1320 | switch (variant) { | |
1321 | case VARIANT_AUTO: | |
1322 | BUG("VARIANT_AUTO passed to push_ssh_options"); | |
1323 | case VARIANT_SIMPLE: | |
1324 | die(_("ssh variant 'simple' does not support -6")); | |
1325 | case VARIANT_SSH: | |
1326 | case VARIANT_PLINK: | |
1327 | case VARIANT_PUTTY: | |
1328 | case VARIANT_TORTOISEPLINK: | |
1329 | strvec_push(args, "-6"); | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | if (variant == VARIANT_TORTOISEPLINK) | |
1334 | strvec_push(args, "-batch"); | |
1335 | ||
1336 | if (port) { | |
1337 | switch (variant) { | |
1338 | case VARIANT_AUTO: | |
1339 | BUG("VARIANT_AUTO passed to push_ssh_options"); | |
1340 | case VARIANT_SIMPLE: | |
1341 | die(_("ssh variant 'simple' does not support setting port")); | |
1342 | case VARIANT_SSH: | |
1343 | strvec_push(args, "-p"); | |
1344 | break; | |
1345 | case VARIANT_PLINK: | |
1346 | case VARIANT_PUTTY: | |
1347 | case VARIANT_TORTOISEPLINK: | |
1348 | strvec_push(args, "-P"); | |
1349 | } | |
1350 | ||
1351 | strvec_push(args, port); | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | /* Prepare a child_process for use by Git's SSH-tunneled transport. */ | |
1356 | static void fill_ssh_args(struct child_process *conn, const char *ssh_host, | |
1357 | const char *port, enum protocol_version version, | |
1358 | int flags) | |
1359 | { | |
1360 | const char *ssh; | |
1361 | enum ssh_variant variant; | |
1362 | ||
1363 | if (looks_like_command_line_option(ssh_host)) | |
1364 | die(_("strange hostname '%s' blocked"), ssh_host); | |
1365 | ||
1366 | ssh = get_ssh_command(); | |
1367 | if (ssh) { | |
1368 | variant = determine_ssh_variant(ssh, 1); | |
1369 | } else { | |
1370 | /* | |
1371 | * GIT_SSH is the no-shell version of | |
1372 | * GIT_SSH_COMMAND (and must remain so for | |
1373 | * historical compatibility). | |
1374 | */ | |
1375 | conn->use_shell = 0; | |
1376 | ||
1377 | ssh = getenv("GIT_SSH"); | |
1378 | if (!ssh) | |
1379 | ssh = "ssh"; | |
1380 | variant = determine_ssh_variant(ssh, 0); | |
1381 | } | |
1382 | ||
1383 | if (variant == VARIANT_AUTO) { | |
1384 | struct child_process detect = CHILD_PROCESS_INIT; | |
1385 | ||
1386 | detect.use_shell = conn->use_shell; | |
1387 | detect.no_stdin = detect.no_stdout = detect.no_stderr = 1; | |
1388 | ||
1389 | strvec_push(&detect.args, ssh); | |
1390 | strvec_push(&detect.args, "-G"); | |
1391 | push_ssh_options(&detect.args, &detect.env, | |
1392 | VARIANT_SSH, port, version, flags); | |
1393 | strvec_push(&detect.args, ssh_host); | |
1394 | ||
1395 | variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH; | |
1396 | } | |
1397 | ||
1398 | strvec_push(&conn->args, ssh); | |
1399 | push_ssh_options(&conn->args, &conn->env, variant, port, version, | |
1400 | flags); | |
1401 | strvec_push(&conn->args, ssh_host); | |
1402 | } | |
1403 | ||
1404 | /* | |
1405 | * This returns the dummy child_process `no_fork` if the transport protocol | |
1406 | * does not need fork(2), or a struct child_process object if it does. Once | |
1407 | * done, finish the connection with finish_connect() with the value returned | |
1408 | * from this function (it is safe to call finish_connect() with NULL to | |
1409 | * support the former case). | |
1410 | * | |
1411 | * If it returns, the connect is successful; it just dies on errors (this | |
1412 | * will hopefully be changed in a libification effort, to return NULL when | |
1413 | * the connection failed). | |
1414 | */ | |
1415 | struct child_process *git_connect(int fd[2], const char *url, | |
1416 | const char *name, | |
1417 | const char *prog, int flags) | |
1418 | { | |
1419 | char *hostandport, *path; | |
1420 | struct child_process *conn; | |
1421 | enum protocol protocol; | |
1422 | enum protocol_version version = get_protocol_version_config(); | |
1423 | ||
1424 | /* | |
1425 | * NEEDSWORK: If we are trying to use protocol v2 and we are planning | |
1426 | * to perform any operation that doesn't involve upload-pack (i.e., a | |
1427 | * fetch, ls-remote, etc), then fallback to v0 since we don't know how | |
1428 | * to do anything else (like push or remote archive) via v2. | |
1429 | */ | |
1430 | if (version == protocol_v2 && strcmp("git-upload-pack", name)) | |
1431 | version = protocol_v0; | |
1432 | ||
1433 | /* Without this we cannot rely on waitpid() to tell | |
1434 | * what happened to our children. | |
1435 | */ | |
1436 | signal(SIGCHLD, SIG_DFL); | |
1437 | ||
1438 | protocol = parse_connect_url(url, &hostandport, &path); | |
1439 | if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) { | |
1440 | printf("Diag: url=%s\n", url ? url : "NULL"); | |
1441 | printf("Diag: protocol=%s\n", prot_name(protocol)); | |
1442 | printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL"); | |
1443 | printf("Diag: path=%s\n", path ? path : "NULL"); | |
1444 | conn = NULL; | |
1445 | } else if (protocol == PROTO_GIT) { | |
1446 | conn = git_connect_git(fd, hostandport, path, prog, version, flags); | |
1447 | conn->trace2_child_class = "transport/git"; | |
1448 | } else { | |
1449 | struct strbuf cmd = STRBUF_INIT; | |
1450 | const char *const *var; | |
1451 | ||
1452 | conn = xmalloc(sizeof(*conn)); | |
1453 | child_process_init(conn); | |
1454 | ||
1455 | if (looks_like_command_line_option(path)) | |
1456 | die(_("strange pathname '%s' blocked"), path); | |
1457 | ||
1458 | strbuf_addstr(&cmd, prog); | |
1459 | strbuf_addch(&cmd, ' '); | |
1460 | sq_quote_buf(&cmd, path); | |
1461 | ||
1462 | /* remove repo-local variables from the environment */ | |
1463 | for (var = local_repo_env; *var; var++) | |
1464 | strvec_push(&conn->env, *var); | |
1465 | ||
1466 | conn->use_shell = 1; | |
1467 | conn->in = conn->out = -1; | |
1468 | if (protocol == PROTO_SSH) { | |
1469 | char *ssh_host = hostandport; | |
1470 | const char *port = NULL; | |
1471 | transport_check_allowed("ssh"); | |
1472 | get_host_and_port(&ssh_host, &port); | |
1473 | ||
1474 | if (!port) | |
1475 | port = get_port(ssh_host); | |
1476 | ||
1477 | if (flags & CONNECT_DIAG_URL) { | |
1478 | printf("Diag: url=%s\n", url ? url : "NULL"); | |
1479 | printf("Diag: protocol=%s\n", prot_name(protocol)); | |
1480 | printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL"); | |
1481 | printf("Diag: port=%s\n", port ? port : "NONE"); | |
1482 | printf("Diag: path=%s\n", path ? path : "NULL"); | |
1483 | ||
1484 | free(hostandport); | |
1485 | free(path); | |
1486 | free(conn); | |
1487 | strbuf_release(&cmd); | |
1488 | return NULL; | |
1489 | } | |
1490 | conn->trace2_child_class = "transport/ssh"; | |
1491 | fill_ssh_args(conn, ssh_host, port, version, flags); | |
1492 | } else { | |
1493 | transport_check_allowed("file"); | |
1494 | conn->trace2_child_class = "transport/file"; | |
1495 | if (version > 0) { | |
1496 | strvec_pushf(&conn->env, | |
1497 | GIT_PROTOCOL_ENVIRONMENT "=version=%d", | |
1498 | version); | |
1499 | } | |
1500 | } | |
1501 | strvec_push(&conn->args, cmd.buf); | |
1502 | ||
1503 | if (start_command(conn)) | |
1504 | die(_("unable to fork")); | |
1505 | ||
1506 | fd[0] = conn->out; /* read from child's stdout */ | |
1507 | fd[1] = conn->in; /* write to child's stdin */ | |
1508 | strbuf_release(&cmd); | |
1509 | } | |
1510 | free(hostandport); | |
1511 | free(path); | |
1512 | return conn; | |
1513 | } | |
1514 | ||
1515 | int finish_connect(struct child_process *conn) | |
1516 | { | |
1517 | int code; | |
1518 | if (!conn || git_connection_is_socket(conn)) | |
1519 | return 0; | |
1520 | ||
1521 | code = finish_command(conn); | |
1522 | free(conn); | |
1523 | return code; | |
1524 | } |