Update messages in preparation for i18n
[git/git.git] / connect.c
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 "sha1-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 argv_array server_capabilities_v2 = ARGV_ARRAY_INIT;
21 static const char *parse_feature_value(const char *, const char *, int *);
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.argc; i++) {
74 const char *out;
75 if (skip_prefix(server_capabilities_v2.argv[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_supports_feature(const char *c, const char *feature,
87 int die_on_error)
88 {
89 int i;
90
91 for (i = 0; i < server_capabilities_v2.argc; i++) {
92 const char *out;
93 if (skip_prefix(server_capabilities_v2.argv[i], c, &out) &&
94 (!*out || *(out++) == '=')) {
95 if (parse_feature_request(out, feature))
96 return 1;
97 else
98 break;
99 }
100 }
101
102 if (die_on_error)
103 die("server doesn't support feature '%s'", feature);
104
105 return 0;
106 }
107
108 static void process_capabilities_v2(struct packet_reader *reader)
109 {
110 while (packet_reader_read(reader) == PACKET_READ_NORMAL)
111 argv_array_push(&server_capabilities_v2, reader->line);
112
113 if (reader->status != PACKET_READ_FLUSH)
114 die("expected flush after capabilities");
115 }
116
117 enum protocol_version discover_version(struct packet_reader *reader)
118 {
119 enum protocol_version version = protocol_unknown_version;
120
121 /*
122 * Peek the first line of the server's response to
123 * determine the protocol version the server is speaking.
124 */
125 switch (packet_reader_peek(reader)) {
126 case PACKET_READ_EOF:
127 die_initial_contact(0);
128 case PACKET_READ_FLUSH:
129 case PACKET_READ_DELIM:
130 version = protocol_v0;
131 break;
132 case PACKET_READ_NORMAL:
133 version = determine_protocol_version_client(reader->line);
134 break;
135 }
136
137 switch (version) {
138 case protocol_v2:
139 process_capabilities_v2(reader);
140 break;
141 case protocol_v1:
142 /* Read the peeked version line */
143 packet_reader_read(reader);
144 break;
145 case protocol_v0:
146 break;
147 case protocol_unknown_version:
148 BUG("unknown protocol version");
149 }
150
151 return version;
152 }
153
154 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
155 {
156 char *sym, *target;
157 struct string_list_item *item;
158
159 if (!len)
160 return; /* just "symref" */
161 /* e.g. "symref=HEAD:refs/heads/master" */
162 sym = xmemdupz(val, len);
163 target = strchr(sym, ':');
164 if (!target)
165 /* just "symref=something" */
166 goto reject;
167 *(target++) = '\0';
168 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
169 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
170 /* "symref=bogus:pair */
171 goto reject;
172 item = string_list_append_nodup(symref, sym);
173 item->util = target;
174 return;
175 reject:
176 free(sym);
177 return;
178 }
179
180 static void annotate_refs_with_symref_info(struct ref *ref)
181 {
182 struct string_list symref = STRING_LIST_INIT_DUP;
183 const char *feature_list = server_capabilities_v1;
184
185 while (feature_list) {
186 int len;
187 const char *val;
188
189 val = parse_feature_value(feature_list, "symref", &len);
190 if (!val)
191 break;
192 parse_one_symref_info(&symref, val, len);
193 feature_list = val + 1;
194 }
195 string_list_sort(&symref);
196
197 for (; ref; ref = ref->next) {
198 struct string_list_item *item;
199 item = string_list_lookup(&symref, ref->name);
200 if (!item)
201 continue;
202 ref->symref = xstrdup((char *)item->util);
203 }
204 string_list_clear(&symref, 0);
205 }
206
207 static void process_capabilities(const char *line, int *len)
208 {
209 int nul_location = strlen(line);
210 if (nul_location == *len)
211 return;
212 server_capabilities_v1 = xstrdup(line + nul_location + 1);
213 *len = nul_location;
214 }
215
216 static int process_dummy_ref(const char *line)
217 {
218 struct object_id oid;
219 const char *name;
220
221 if (parse_oid_hex(line, &oid, &name))
222 return 0;
223 if (*name != ' ')
224 return 0;
225 name++;
226
227 return !oidcmp(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
228 }
229
230 static void check_no_capabilities(const char *line, int len)
231 {
232 if (strlen(line) != len)
233 warning("ignoring capabilities after first line '%s'",
234 line + strlen(line));
235 }
236
237 static int process_ref(const char *line, int len, struct ref ***list,
238 unsigned int flags, struct oid_array *extra_have)
239 {
240 struct object_id old_oid;
241 const char *name;
242
243 if (parse_oid_hex(line, &old_oid, &name))
244 return 0;
245 if (*name != ' ')
246 return 0;
247 name++;
248
249 if (extra_have && !strcmp(name, ".have")) {
250 oid_array_append(extra_have, &old_oid);
251 } else if (!strcmp(name, "capabilities^{}")) {
252 die("protocol error: unexpected capabilities^{}");
253 } else if (check_ref(name, flags)) {
254 struct ref *ref = alloc_ref(name);
255 oidcpy(&ref->old_oid, &old_oid);
256 **list = ref;
257 *list = &ref->next;
258 }
259 check_no_capabilities(line, len);
260 return 1;
261 }
262
263 static int process_shallow(const char *line, int len,
264 struct oid_array *shallow_points)
265 {
266 const char *arg;
267 struct object_id old_oid;
268
269 if (!skip_prefix(line, "shallow ", &arg))
270 return 0;
271
272 if (get_oid_hex(arg, &old_oid))
273 die("protocol error: expected shallow sha-1, got '%s'", arg);
274 if (!shallow_points)
275 die("repository on the other end cannot be shallow");
276 oid_array_append(shallow_points, &old_oid);
277 check_no_capabilities(line, len);
278 return 1;
279 }
280
281 enum get_remote_heads_state {
282 EXPECTING_FIRST_REF = 0,
283 EXPECTING_REF,
284 EXPECTING_SHALLOW,
285 EXPECTING_DONE,
286 };
287
288 /*
289 * Read all the refs from the other end
290 */
291 struct ref **get_remote_heads(struct packet_reader *reader,
292 struct ref **list, unsigned int flags,
293 struct oid_array *extra_have,
294 struct oid_array *shallow_points)
295 {
296 struct ref **orig_list = list;
297 int len = 0;
298 enum get_remote_heads_state state = EXPECTING_FIRST_REF;
299 const char *arg;
300
301 *list = NULL;
302
303 while (state != EXPECTING_DONE) {
304 switch (packet_reader_read(reader)) {
305 case PACKET_READ_EOF:
306 die_initial_contact(1);
307 case PACKET_READ_NORMAL:
308 len = reader->pktlen;
309 if (len > 4 && skip_prefix(reader->line, "ERR ", &arg))
310 die("remote error: %s", arg);
311 break;
312 case PACKET_READ_FLUSH:
313 state = EXPECTING_DONE;
314 break;
315 case PACKET_READ_DELIM:
316 die("invalid packet");
317 }
318
319 switch (state) {
320 case EXPECTING_FIRST_REF:
321 process_capabilities(reader->line, &len);
322 if (process_dummy_ref(reader->line)) {
323 state = EXPECTING_SHALLOW;
324 break;
325 }
326 state = EXPECTING_REF;
327 /* fallthrough */
328 case EXPECTING_REF:
329 if (process_ref(reader->line, len, &list, flags, extra_have))
330 break;
331 state = EXPECTING_SHALLOW;
332 /* fallthrough */
333 case EXPECTING_SHALLOW:
334 if (process_shallow(reader->line, len, shallow_points))
335 break;
336 die("protocol error: unexpected '%s'", reader->line);
337 case EXPECTING_DONE:
338 break;
339 }
340 }
341
342 annotate_refs_with_symref_info(*orig_list);
343
344 return list;
345 }
346
347 /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */
348 static int process_ref_v2(const char *line, struct ref ***list)
349 {
350 int ret = 1;
351 int i = 0;
352 struct object_id old_oid;
353 struct ref *ref;
354 struct string_list line_sections = STRING_LIST_INIT_DUP;
355 const char *end;
356
357 /*
358 * Ref lines have a number of fields which are space deliminated. The
359 * first field is the OID of the ref. The second field is the ref
360 * name. Subsequent fields (symref-target and peeled) are optional and
361 * don't have a particular order.
362 */
363 if (string_list_split(&line_sections, line, ' ', -1) < 2) {
364 ret = 0;
365 goto out;
366 }
367
368 if (parse_oid_hex(line_sections.items[i++].string, &old_oid, &end) ||
369 *end) {
370 ret = 0;
371 goto out;
372 }
373
374 ref = alloc_ref(line_sections.items[i++].string);
375
376 oidcpy(&ref->old_oid, &old_oid);
377 **list = ref;
378 *list = &ref->next;
379
380 for (; i < line_sections.nr; i++) {
381 const char *arg = line_sections.items[i].string;
382 if (skip_prefix(arg, "symref-target:", &arg))
383 ref->symref = xstrdup(arg);
384
385 if (skip_prefix(arg, "peeled:", &arg)) {
386 struct object_id peeled_oid;
387 char *peeled_name;
388 struct ref *peeled;
389 if (parse_oid_hex(arg, &peeled_oid, &end) || *end) {
390 ret = 0;
391 goto out;
392 }
393
394 peeled_name = xstrfmt("%s^{}", ref->name);
395 peeled = alloc_ref(peeled_name);
396
397 oidcpy(&peeled->old_oid, &peeled_oid);
398 **list = peeled;
399 *list = &peeled->next;
400
401 free(peeled_name);
402 }
403 }
404
405 out:
406 string_list_clear(&line_sections, 0);
407 return ret;
408 }
409
410 struct ref **get_remote_refs(int fd_out, struct packet_reader *reader,
411 struct ref **list, int for_push,
412 const struct argv_array *ref_prefixes,
413 const struct string_list *server_options)
414 {
415 int i;
416 *list = NULL;
417
418 if (server_supports_v2("ls-refs", 1))
419 packet_write_fmt(fd_out, "command=ls-refs\n");
420
421 if (server_supports_v2("agent", 0))
422 packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized());
423
424 if (server_options && server_options->nr &&
425 server_supports_v2("server-option", 1))
426 for (i = 0; i < server_options->nr; i++)
427 packet_write_fmt(fd_out, "server-option=%s",
428 server_options->items[i].string);
429
430 packet_delim(fd_out);
431 /* When pushing we don't want to request the peeled tags */
432 if (!for_push)
433 packet_write_fmt(fd_out, "peel\n");
434 packet_write_fmt(fd_out, "symrefs\n");
435 for (i = 0; ref_prefixes && i < ref_prefixes->argc; i++) {
436 packet_write_fmt(fd_out, "ref-prefix %s\n",
437 ref_prefixes->argv[i]);
438 }
439 packet_flush(fd_out);
440
441 /* Process response from server */
442 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
443 if (!process_ref_v2(reader->line, &list))
444 die("invalid ls-refs response: %s", reader->line);
445 }
446
447 if (reader->status != PACKET_READ_FLUSH)
448 die("expected flush after ref listing");
449
450 return list;
451 }
452
453 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
454 {
455 int len;
456
457 if (!feature_list)
458 return NULL;
459
460 len = strlen(feature);
461 while (*feature_list) {
462 const char *found = strstr(feature_list, feature);
463 if (!found)
464 return NULL;
465 if (feature_list == found || isspace(found[-1])) {
466 const char *value = found + len;
467 /* feature with no value (e.g., "thin-pack") */
468 if (!*value || isspace(*value)) {
469 if (lenp)
470 *lenp = 0;
471 return value;
472 }
473 /* feature with a value (e.g., "agent=git/1.2.3") */
474 else if (*value == '=') {
475 value++;
476 if (lenp)
477 *lenp = strcspn(value, " \t\n");
478 return value;
479 }
480 /*
481 * otherwise we matched a substring of another feature;
482 * keep looking
483 */
484 }
485 feature_list = found + 1;
486 }
487 return NULL;
488 }
489
490 int parse_feature_request(const char *feature_list, const char *feature)
491 {
492 return !!parse_feature_value(feature_list, feature, NULL);
493 }
494
495 const char *server_feature_value(const char *feature, int *len)
496 {
497 return parse_feature_value(server_capabilities_v1, feature, len);
498 }
499
500 int server_supports(const char *feature)
501 {
502 return !!server_feature_value(feature, NULL);
503 }
504
505 enum protocol {
506 PROTO_LOCAL = 1,
507 PROTO_FILE,
508 PROTO_SSH,
509 PROTO_GIT
510 };
511
512 int url_is_local_not_ssh(const char *url)
513 {
514 const char *colon = strchr(url, ':');
515 const char *slash = strchr(url, '/');
516 return !colon || (slash && slash < colon) ||
517 has_dos_drive_prefix(url);
518 }
519
520 static const char *prot_name(enum protocol protocol)
521 {
522 switch (protocol) {
523 case PROTO_LOCAL:
524 case PROTO_FILE:
525 return "file";
526 case PROTO_SSH:
527 return "ssh";
528 case PROTO_GIT:
529 return "git";
530 default:
531 return "unknown protocol";
532 }
533 }
534
535 static enum protocol get_protocol(const char *name)
536 {
537 if (!strcmp(name, "ssh"))
538 return PROTO_SSH;
539 if (!strcmp(name, "git"))
540 return PROTO_GIT;
541 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
542 return PROTO_SSH;
543 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
544 return PROTO_SSH;
545 if (!strcmp(name, "file"))
546 return PROTO_FILE;
547 die("protocol '%s' is not supported", name);
548 }
549
550 static char *host_end(char **hoststart, int removebrackets)
551 {
552 char *host = *hoststart;
553 char *end;
554 char *start = strstr(host, "@[");
555 if (start)
556 start++; /* Jump over '@' */
557 else
558 start = host;
559 if (start[0] == '[') {
560 end = strchr(start + 1, ']');
561 if (end) {
562 if (removebrackets) {
563 *end = 0;
564 memmove(start, start + 1, end - start);
565 end++;
566 }
567 } else
568 end = host;
569 } else
570 end = host;
571 return end;
572 }
573
574 #define STR_(s) # s
575 #define STR(s) STR_(s)
576
577 static void get_host_and_port(char **host, const char **port)
578 {
579 char *colon, *end;
580 end = host_end(host, 1);
581 colon = strchr(end, ':');
582 if (colon) {
583 long portnr = strtol(colon + 1, &end, 10);
584 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
585 *colon = 0;
586 *port = colon + 1;
587 } else if (!colon[1]) {
588 *colon = 0;
589 }
590 }
591 }
592
593 static void enable_keepalive(int sockfd)
594 {
595 int ka = 1;
596
597 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
598 error_errno("unable to set SO_KEEPALIVE on socket");
599 }
600
601 #ifndef NO_IPV6
602
603 static const char *ai_name(const struct addrinfo *ai)
604 {
605 static char addr[NI_MAXHOST];
606 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
607 NI_NUMERICHOST) != 0)
608 xsnprintf(addr, sizeof(addr), "(unknown)");
609
610 return addr;
611 }
612
613 /*
614 * Returns a connected socket() fd, or else die()s.
615 */
616 static int git_tcp_connect_sock(char *host, int flags)
617 {
618 struct strbuf error_message = STRBUF_INIT;
619 int sockfd = -1;
620 const char *port = STR(DEFAULT_GIT_PORT);
621 struct addrinfo hints, *ai0, *ai;
622 int gai;
623 int cnt = 0;
624
625 get_host_and_port(&host, &port);
626 if (!*port)
627 port = "<none>";
628
629 memset(&hints, 0, sizeof(hints));
630 if (flags & CONNECT_IPV4)
631 hints.ai_family = AF_INET;
632 else if (flags & CONNECT_IPV6)
633 hints.ai_family = AF_INET6;
634 hints.ai_socktype = SOCK_STREAM;
635 hints.ai_protocol = IPPROTO_TCP;
636
637 if (flags & CONNECT_VERBOSE)
638 fprintf(stderr, "Looking up %s ... ", host);
639
640 gai = getaddrinfo(host, port, &hints, &ai);
641 if (gai)
642 die("unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
643
644 if (flags & CONNECT_VERBOSE)
645 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
646
647 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
648 sockfd = socket(ai->ai_family,
649 ai->ai_socktype, ai->ai_protocol);
650 if ((sockfd < 0) ||
651 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
652 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
653 host, cnt, ai_name(ai), strerror(errno));
654 if (0 <= sockfd)
655 close(sockfd);
656 sockfd = -1;
657 continue;
658 }
659 if (flags & CONNECT_VERBOSE)
660 fprintf(stderr, "%s ", ai_name(ai));
661 break;
662 }
663
664 freeaddrinfo(ai0);
665
666 if (sockfd < 0)
667 die("unable to connect to %s:\n%s", host, error_message.buf);
668
669 enable_keepalive(sockfd);
670
671 if (flags & CONNECT_VERBOSE)
672 fprintf_ln(stderr, "done.");
673
674 strbuf_release(&error_message);
675
676 return sockfd;
677 }
678
679 #else /* NO_IPV6 */
680
681 /*
682 * Returns a connected socket() fd, or else die()s.
683 */
684 static int git_tcp_connect_sock(char *host, int flags)
685 {
686 struct strbuf error_message = STRBUF_INIT;
687 int sockfd = -1;
688 const char *port = STR(DEFAULT_GIT_PORT);
689 char *ep;
690 struct hostent *he;
691 struct sockaddr_in sa;
692 char **ap;
693 unsigned int nport;
694 int cnt;
695
696 get_host_and_port(&host, &port);
697
698 if (flags & CONNECT_VERBOSE)
699 fprintf(stderr, "Looking up %s ... ", host);
700
701 he = gethostbyname(host);
702 if (!he)
703 die("unable to look up %s (%s)", host, hstrerror(h_errno));
704 nport = strtoul(port, &ep, 10);
705 if ( ep == port || *ep ) {
706 /* Not numeric */
707 struct servent *se = getservbyname(port,"tcp");
708 if ( !se )
709 die("unknown port %s", port);
710 nport = se->s_port;
711 }
712
713 if (flags & CONNECT_VERBOSE)
714 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
715
716 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
717 memset(&sa, 0, sizeof sa);
718 sa.sin_family = he->h_addrtype;
719 sa.sin_port = htons(nport);
720 memcpy(&sa.sin_addr, *ap, he->h_length);
721
722 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
723 if ((sockfd < 0) ||
724 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
725 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
726 host,
727 cnt,
728 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
729 strerror(errno));
730 if (0 <= sockfd)
731 close(sockfd);
732 sockfd = -1;
733 continue;
734 }
735 if (flags & CONNECT_VERBOSE)
736 fprintf(stderr, "%s ",
737 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
738 break;
739 }
740
741 if (sockfd < 0)
742 die("unable to connect to %s:\n%s", host, error_message.buf);
743
744 enable_keepalive(sockfd);
745
746 if (flags & CONNECT_VERBOSE)
747 fprintf_ln(stderr, "done.");
748
749 return sockfd;
750 }
751
752 #endif /* NO_IPV6 */
753
754
755 /*
756 * Dummy child_process returned by git_connect() if the transport protocol
757 * does not need fork(2).
758 */
759 static struct child_process no_fork = CHILD_PROCESS_INIT;
760
761 int git_connection_is_socket(struct child_process *conn)
762 {
763 return conn == &no_fork;
764 }
765
766 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
767 {
768 int sockfd = git_tcp_connect_sock(host, flags);
769
770 fd[0] = sockfd;
771 fd[1] = dup(sockfd);
772
773 return &no_fork;
774 }
775
776
777 static char *git_proxy_command;
778
779 static int git_proxy_command_options(const char *var, const char *value,
780 void *cb)
781 {
782 if (!strcmp(var, "core.gitproxy")) {
783 const char *for_pos;
784 int matchlen = -1;
785 int hostlen;
786 const char *rhost_name = cb;
787 int rhost_len = strlen(rhost_name);
788
789 if (git_proxy_command)
790 return 0;
791 if (!value)
792 return config_error_nonbool(var);
793 /* [core]
794 * ;# matches www.kernel.org as well
795 * gitproxy = netcatter-1 for kernel.org
796 * gitproxy = netcatter-2 for sample.xz
797 * gitproxy = netcatter-default
798 */
799 for_pos = strstr(value, " for ");
800 if (!for_pos)
801 /* matches everybody */
802 matchlen = strlen(value);
803 else {
804 hostlen = strlen(for_pos + 5);
805 if (rhost_len < hostlen)
806 matchlen = -1;
807 else if (!strncmp(for_pos + 5,
808 rhost_name + rhost_len - hostlen,
809 hostlen) &&
810 ((rhost_len == hostlen) ||
811 rhost_name[rhost_len - hostlen -1] == '.'))
812 matchlen = for_pos - value;
813 else
814 matchlen = -1;
815 }
816 if (0 <= matchlen) {
817 /* core.gitproxy = none for kernel.org */
818 if (matchlen == 4 &&
819 !memcmp(value, "none", 4))
820 matchlen = 0;
821 git_proxy_command = xmemdupz(value, matchlen);
822 }
823 return 0;
824 }
825
826 return git_default_config(var, value, cb);
827 }
828
829 static int git_use_proxy(const char *host)
830 {
831 git_proxy_command = getenv("GIT_PROXY_COMMAND");
832 git_config(git_proxy_command_options, (void*)host);
833 return (git_proxy_command && *git_proxy_command);
834 }
835
836 static struct child_process *git_proxy_connect(int fd[2], char *host)
837 {
838 const char *port = STR(DEFAULT_GIT_PORT);
839 struct child_process *proxy;
840
841 get_host_and_port(&host, &port);
842
843 if (looks_like_command_line_option(host))
844 die("strange hostname '%s' blocked", host);
845 if (looks_like_command_line_option(port))
846 die("strange port '%s' blocked", port);
847
848 proxy = xmalloc(sizeof(*proxy));
849 child_process_init(proxy);
850 argv_array_push(&proxy->args, git_proxy_command);
851 argv_array_push(&proxy->args, host);
852 argv_array_push(&proxy->args, port);
853 proxy->in = -1;
854 proxy->out = -1;
855 if (start_command(proxy))
856 die("cannot start proxy %s", git_proxy_command);
857 fd[0] = proxy->out; /* read from proxy stdout */
858 fd[1] = proxy->in; /* write to proxy stdin */
859 return proxy;
860 }
861
862 static char *get_port(char *host)
863 {
864 char *end;
865 char *p = strchr(host, ':');
866
867 if (p) {
868 long port = strtol(p + 1, &end, 10);
869 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
870 *p = '\0';
871 return p+1;
872 }
873 }
874
875 return NULL;
876 }
877
878 /*
879 * Extract protocol and relevant parts from the specified connection URL.
880 * The caller must free() the returned strings.
881 */
882 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
883 char **ret_path)
884 {
885 char *url;
886 char *host, *path;
887 char *end;
888 int separator = '/';
889 enum protocol protocol = PROTO_LOCAL;
890
891 if (is_url(url_orig))
892 url = url_decode(url_orig);
893 else
894 url = xstrdup(url_orig);
895
896 host = strstr(url, "://");
897 if (host) {
898 *host = '\0';
899 protocol = get_protocol(url);
900 host += 3;
901 } else {
902 host = url;
903 if (!url_is_local_not_ssh(url)) {
904 protocol = PROTO_SSH;
905 separator = ':';
906 }
907 }
908
909 /*
910 * Don't do destructive transforms as protocol code does
911 * '[]' unwrapping in get_host_and_port()
912 */
913 end = host_end(&host, 0);
914
915 if (protocol == PROTO_LOCAL)
916 path = end;
917 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
918 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
919 else
920 path = strchr(end, separator);
921
922 if (!path || !*path)
923 die("no path specified; see 'git help pull' for valid url syntax");
924
925 /*
926 * null-terminate hostname and point path to ~ for URL's like this:
927 * ssh://host.xz/~user/repo
928 */
929
930 end = path; /* Need to \0 terminate host here */
931 if (separator == ':')
932 path++; /* path starts after ':' */
933 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
934 if (path[1] == '~')
935 path++;
936 }
937
938 path = xstrdup(path);
939 *end = '\0';
940
941 *ret_host = xstrdup(host);
942 *ret_path = path;
943 free(url);
944 return protocol;
945 }
946
947 static const char *get_ssh_command(void)
948 {
949 const char *ssh;
950
951 if ((ssh = getenv("GIT_SSH_COMMAND")))
952 return ssh;
953
954 if (!git_config_get_string_const("core.sshcommand", &ssh))
955 return ssh;
956
957 return NULL;
958 }
959
960 enum ssh_variant {
961 VARIANT_AUTO,
962 VARIANT_SIMPLE,
963 VARIANT_SSH,
964 VARIANT_PLINK,
965 VARIANT_PUTTY,
966 VARIANT_TORTOISEPLINK,
967 };
968
969 static void override_ssh_variant(enum ssh_variant *ssh_variant)
970 {
971 const char *variant = getenv("GIT_SSH_VARIANT");
972
973 if (!variant && git_config_get_string_const("ssh.variant", &variant))
974 return;
975
976 if (!strcmp(variant, "auto"))
977 *ssh_variant = VARIANT_AUTO;
978 else if (!strcmp(variant, "plink"))
979 *ssh_variant = VARIANT_PLINK;
980 else if (!strcmp(variant, "putty"))
981 *ssh_variant = VARIANT_PUTTY;
982 else if (!strcmp(variant, "tortoiseplink"))
983 *ssh_variant = VARIANT_TORTOISEPLINK;
984 else if (!strcmp(variant, "simple"))
985 *ssh_variant = VARIANT_SIMPLE;
986 else
987 *ssh_variant = VARIANT_SSH;
988 }
989
990 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
991 int is_cmdline)
992 {
993 enum ssh_variant ssh_variant = VARIANT_AUTO;
994 const char *variant;
995 char *p = NULL;
996
997 override_ssh_variant(&ssh_variant);
998
999 if (ssh_variant != VARIANT_AUTO)
1000 return ssh_variant;
1001
1002 if (!is_cmdline) {
1003 p = xstrdup(ssh_command);
1004 variant = basename(p);
1005 } else {
1006 const char **ssh_argv;
1007
1008 p = xstrdup(ssh_command);
1009 if (split_cmdline(p, &ssh_argv) > 0) {
1010 variant = basename((char *)ssh_argv[0]);
1011 /*
1012 * At this point, variant points into the buffer
1013 * referenced by p, hence we do not need ssh_argv
1014 * any longer.
1015 */
1016 free(ssh_argv);
1017 } else {
1018 free(p);
1019 return ssh_variant;
1020 }
1021 }
1022
1023 if (!strcasecmp(variant, "ssh") ||
1024 !strcasecmp(variant, "ssh.exe"))
1025 ssh_variant = VARIANT_SSH;
1026 else if (!strcasecmp(variant, "plink") ||
1027 !strcasecmp(variant, "plink.exe"))
1028 ssh_variant = VARIANT_PLINK;
1029 else if (!strcasecmp(variant, "tortoiseplink") ||
1030 !strcasecmp(variant, "tortoiseplink.exe"))
1031 ssh_variant = VARIANT_TORTOISEPLINK;
1032
1033 free(p);
1034 return ssh_variant;
1035 }
1036
1037 /*
1038 * Open a connection using Git's native protocol.
1039 *
1040 * The caller is responsible for freeing hostandport, but this function may
1041 * modify it (for example, to truncate it to remove the port part).
1042 */
1043 static struct child_process *git_connect_git(int fd[2], char *hostandport,
1044 const char *path, const char *prog,
1045 enum protocol_version version,
1046 int flags)
1047 {
1048 struct child_process *conn;
1049 struct strbuf request = STRBUF_INIT;
1050 /*
1051 * Set up virtual host information based on where we will
1052 * connect, unless the user has overridden us in
1053 * the environment.
1054 */
1055 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
1056 if (target_host)
1057 target_host = xstrdup(target_host);
1058 else
1059 target_host = xstrdup(hostandport);
1060
1061 transport_check_allowed("git");
1062
1063 /*
1064 * These underlying connection commands die() if they
1065 * cannot connect.
1066 */
1067 if (git_use_proxy(hostandport))
1068 conn = git_proxy_connect(fd, hostandport);
1069 else
1070 conn = git_tcp_connect(fd, hostandport, flags);
1071 /*
1072 * Separate original protocol components prog and path
1073 * from extended host header with a NUL byte.
1074 *
1075 * Note: Do not add any other headers here! Doing so
1076 * will cause older git-daemon servers to crash.
1077 */
1078 strbuf_addf(&request,
1079 "%s %s%chost=%s%c",
1080 prog, path, 0,
1081 target_host, 0);
1082
1083 /* If using a new version put that stuff here after a second null byte */
1084 if (version > 0) {
1085 strbuf_addch(&request, '\0');
1086 strbuf_addf(&request, "version=%d%c",
1087 version, '\0');
1088 }
1089
1090 packet_write(fd[1], request.buf, request.len);
1091
1092 free(target_host);
1093 strbuf_release(&request);
1094 return conn;
1095 }
1096
1097 /*
1098 * Append the appropriate environment variables to `env` and options to
1099 * `args` for running ssh in Git's SSH-tunneled transport.
1100 */
1101 static void push_ssh_options(struct argv_array *args, struct argv_array *env,
1102 enum ssh_variant variant, const char *port,
1103 enum protocol_version version, int flags)
1104 {
1105 if (variant == VARIANT_SSH &&
1106 version > 0) {
1107 argv_array_push(args, "-o");
1108 argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
1109 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1110 version);
1111 }
1112
1113 if (flags & CONNECT_IPV4) {
1114 switch (variant) {
1115 case VARIANT_AUTO:
1116 BUG("VARIANT_AUTO passed to push_ssh_options");
1117 case VARIANT_SIMPLE:
1118 die("ssh variant 'simple' does not support -4");
1119 case VARIANT_SSH:
1120 case VARIANT_PLINK:
1121 case VARIANT_PUTTY:
1122 case VARIANT_TORTOISEPLINK:
1123 argv_array_push(args, "-4");
1124 }
1125 } else if (flags & CONNECT_IPV6) {
1126 switch (variant) {
1127 case VARIANT_AUTO:
1128 BUG("VARIANT_AUTO passed to push_ssh_options");
1129 case VARIANT_SIMPLE:
1130 die("ssh variant 'simple' does not support -6");
1131 case VARIANT_SSH:
1132 case VARIANT_PLINK:
1133 case VARIANT_PUTTY:
1134 case VARIANT_TORTOISEPLINK:
1135 argv_array_push(args, "-6");
1136 }
1137 }
1138
1139 if (variant == VARIANT_TORTOISEPLINK)
1140 argv_array_push(args, "-batch");
1141
1142 if (port) {
1143 switch (variant) {
1144 case VARIANT_AUTO:
1145 BUG("VARIANT_AUTO passed to push_ssh_options");
1146 case VARIANT_SIMPLE:
1147 die("ssh variant 'simple' does not support setting port");
1148 case VARIANT_SSH:
1149 argv_array_push(args, "-p");
1150 break;
1151 case VARIANT_PLINK:
1152 case VARIANT_PUTTY:
1153 case VARIANT_TORTOISEPLINK:
1154 argv_array_push(args, "-P");
1155 }
1156
1157 argv_array_push(args, port);
1158 }
1159 }
1160
1161 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
1162 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
1163 const char *port, enum protocol_version version,
1164 int flags)
1165 {
1166 const char *ssh;
1167 enum ssh_variant variant;
1168
1169 if (looks_like_command_line_option(ssh_host))
1170 die("strange hostname '%s' blocked", ssh_host);
1171
1172 ssh = get_ssh_command();
1173 if (ssh) {
1174 variant = determine_ssh_variant(ssh, 1);
1175 } else {
1176 /*
1177 * GIT_SSH is the no-shell version of
1178 * GIT_SSH_COMMAND (and must remain so for
1179 * historical compatibility).
1180 */
1181 conn->use_shell = 0;
1182
1183 ssh = getenv("GIT_SSH");
1184 if (!ssh)
1185 ssh = "ssh";
1186 variant = determine_ssh_variant(ssh, 0);
1187 }
1188
1189 if (variant == VARIANT_AUTO) {
1190 struct child_process detect = CHILD_PROCESS_INIT;
1191
1192 detect.use_shell = conn->use_shell;
1193 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1194
1195 argv_array_push(&detect.args, ssh);
1196 argv_array_push(&detect.args, "-G");
1197 push_ssh_options(&detect.args, &detect.env_array,
1198 VARIANT_SSH, port, version, flags);
1199 argv_array_push(&detect.args, ssh_host);
1200
1201 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1202 }
1203
1204 argv_array_push(&conn->args, ssh);
1205 push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
1206 argv_array_push(&conn->args, ssh_host);
1207 }
1208
1209 /*
1210 * This returns the dummy child_process `no_fork` if the transport protocol
1211 * does not need fork(2), or a struct child_process object if it does. Once
1212 * done, finish the connection with finish_connect() with the value returned
1213 * from this function (it is safe to call finish_connect() with NULL to
1214 * support the former case).
1215 *
1216 * If it returns, the connect is successful; it just dies on errors (this
1217 * will hopefully be changed in a libification effort, to return NULL when
1218 * the connection failed).
1219 */
1220 struct child_process *git_connect(int fd[2], const char *url,
1221 const char *prog, int flags)
1222 {
1223 char *hostandport, *path;
1224 struct child_process *conn;
1225 enum protocol protocol;
1226 enum protocol_version version = get_protocol_version_config();
1227
1228 /*
1229 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
1230 * to perform a push, then fallback to v0 since the client doesn't know
1231 * how to push yet using v2.
1232 */
1233 if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
1234 version = protocol_v0;
1235
1236 /* Without this we cannot rely on waitpid() to tell
1237 * what happened to our children.
1238 */
1239 signal(SIGCHLD, SIG_DFL);
1240
1241 protocol = parse_connect_url(url, &hostandport, &path);
1242 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1243 printf("Diag: url=%s\n", url ? url : "NULL");
1244 printf("Diag: protocol=%s\n", prot_name(protocol));
1245 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1246 printf("Diag: path=%s\n", path ? path : "NULL");
1247 conn = NULL;
1248 } else if (protocol == PROTO_GIT) {
1249 conn = git_connect_git(fd, hostandport, path, prog, version, flags);
1250 } else {
1251 struct strbuf cmd = STRBUF_INIT;
1252 const char *const *var;
1253
1254 conn = xmalloc(sizeof(*conn));
1255 child_process_init(conn);
1256
1257 if (looks_like_command_line_option(path))
1258 die("strange pathname '%s' blocked", path);
1259
1260 strbuf_addstr(&cmd, prog);
1261 strbuf_addch(&cmd, ' ');
1262 sq_quote_buf(&cmd, path);
1263
1264 /* remove repo-local variables from the environment */
1265 for (var = local_repo_env; *var; var++)
1266 argv_array_push(&conn->env_array, *var);
1267
1268 conn->use_shell = 1;
1269 conn->in = conn->out = -1;
1270 if (protocol == PROTO_SSH) {
1271 char *ssh_host = hostandport;
1272 const char *port = NULL;
1273 transport_check_allowed("ssh");
1274 get_host_and_port(&ssh_host, &port);
1275
1276 if (!port)
1277 port = get_port(ssh_host);
1278
1279 if (flags & CONNECT_DIAG_URL) {
1280 printf("Diag: url=%s\n", url ? url : "NULL");
1281 printf("Diag: protocol=%s\n", prot_name(protocol));
1282 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1283 printf("Diag: port=%s\n", port ? port : "NONE");
1284 printf("Diag: path=%s\n", path ? path : "NULL");
1285
1286 free(hostandport);
1287 free(path);
1288 free(conn);
1289 strbuf_release(&cmd);
1290 return NULL;
1291 }
1292 fill_ssh_args(conn, ssh_host, port, version, flags);
1293 } else {
1294 transport_check_allowed("file");
1295 if (version > 0) {
1296 argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1297 version);
1298 }
1299 }
1300 argv_array_push(&conn->args, cmd.buf);
1301
1302 if (start_command(conn))
1303 die("unable to fork");
1304
1305 fd[0] = conn->out; /* read from child's stdout */
1306 fd[1] = conn->in; /* write to child's stdin */
1307 strbuf_release(&cmd);
1308 }
1309 free(hostandport);
1310 free(path);
1311 return conn;
1312 }
1313
1314 int finish_connect(struct child_process *conn)
1315 {
1316 int code;
1317 if (!conn || git_connection_is_socket(conn))
1318 return 0;
1319
1320 code = finish_command(conn);
1321 free(conn);
1322 return code;
1323 }