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