Merge branch 'cb/do-not-use-test-cmp-with-a'
[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 oideq(&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
300 *list = NULL;
301
302 while (state != EXPECTING_DONE) {
303 switch (packet_reader_read(reader)) {
304 case PACKET_READ_EOF:
305 die_initial_contact(1);
306 case PACKET_READ_NORMAL:
307 len = reader->pktlen;
308 break;
309 case PACKET_READ_FLUSH:
310 state = EXPECTING_DONE;
311 break;
312 case PACKET_READ_DELIM:
313 die(_("invalid packet"));
314 }
315
316 switch (state) {
317 case EXPECTING_FIRST_REF:
318 process_capabilities(reader->line, &len);
319 if (process_dummy_ref(reader->line)) {
320 state = EXPECTING_SHALLOW;
321 break;
322 }
323 state = EXPECTING_REF;
324 /* fallthrough */
325 case EXPECTING_REF:
326 if (process_ref(reader->line, len, &list, flags, extra_have))
327 break;
328 state = EXPECTING_SHALLOW;
329 /* fallthrough */
330 case EXPECTING_SHALLOW:
331 if (process_shallow(reader->line, len, shallow_points))
332 break;
333 die(_("protocol error: unexpected '%s'"), reader->line);
334 case EXPECTING_DONE:
335 break;
336 }
337 }
338
339 annotate_refs_with_symref_info(*orig_list);
340
341 return list;
342 }
343
344 /* Returns 1 when a valid ref has been added to `list`, 0 otherwise */
345 static int process_ref_v2(const char *line, struct ref ***list)
346 {
347 int ret = 1;
348 int i = 0;
349 struct object_id old_oid;
350 struct ref *ref;
351 struct string_list line_sections = STRING_LIST_INIT_DUP;
352 const char *end;
353
354 /*
355 * Ref lines have a number of fields which are space deliminated. The
356 * first field is the OID of the ref. The second field is the ref
357 * name. Subsequent fields (symref-target and peeled) are optional and
358 * don't have a particular order.
359 */
360 if (string_list_split(&line_sections, line, ' ', -1) < 2) {
361 ret = 0;
362 goto out;
363 }
364
365 if (parse_oid_hex(line_sections.items[i++].string, &old_oid, &end) ||
366 *end) {
367 ret = 0;
368 goto out;
369 }
370
371 ref = alloc_ref(line_sections.items[i++].string);
372
373 oidcpy(&ref->old_oid, &old_oid);
374 **list = ref;
375 *list = &ref->next;
376
377 for (; i < line_sections.nr; i++) {
378 const char *arg = line_sections.items[i].string;
379 if (skip_prefix(arg, "symref-target:", &arg))
380 ref->symref = xstrdup(arg);
381
382 if (skip_prefix(arg, "peeled:", &arg)) {
383 struct object_id peeled_oid;
384 char *peeled_name;
385 struct ref *peeled;
386 if (parse_oid_hex(arg, &peeled_oid, &end) || *end) {
387 ret = 0;
388 goto out;
389 }
390
391 peeled_name = xstrfmt("%s^{}", ref->name);
392 peeled = alloc_ref(peeled_name);
393
394 oidcpy(&peeled->old_oid, &peeled_oid);
395 **list = peeled;
396 *list = &peeled->next;
397
398 free(peeled_name);
399 }
400 }
401
402 out:
403 string_list_clear(&line_sections, 0);
404 return ret;
405 }
406
407 struct ref **get_remote_refs(int fd_out, struct packet_reader *reader,
408 struct ref **list, int for_push,
409 const struct argv_array *ref_prefixes,
410 const struct string_list *server_options)
411 {
412 int i;
413 *list = NULL;
414
415 if (server_supports_v2("ls-refs", 1))
416 packet_write_fmt(fd_out, "command=ls-refs\n");
417
418 if (server_supports_v2("agent", 0))
419 packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized());
420
421 if (server_options && server_options->nr &&
422 server_supports_v2("server-option", 1))
423 for (i = 0; i < server_options->nr; i++)
424 packet_write_fmt(fd_out, "server-option=%s",
425 server_options->items[i].string);
426
427 packet_delim(fd_out);
428 /* When pushing we don't want to request the peeled tags */
429 if (!for_push)
430 packet_write_fmt(fd_out, "peel\n");
431 packet_write_fmt(fd_out, "symrefs\n");
432 for (i = 0; ref_prefixes && i < ref_prefixes->argc; i++) {
433 packet_write_fmt(fd_out, "ref-prefix %s\n",
434 ref_prefixes->argv[i]);
435 }
436 packet_flush(fd_out);
437
438 /* Process response from server */
439 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
440 if (!process_ref_v2(reader->line, &list))
441 die(_("invalid ls-refs response: %s"), reader->line);
442 }
443
444 if (reader->status != PACKET_READ_FLUSH)
445 die(_("expected flush after ref listing"));
446
447 return list;
448 }
449
450 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
451 {
452 int len;
453
454 if (!feature_list)
455 return NULL;
456
457 len = strlen(feature);
458 while (*feature_list) {
459 const char *found = strstr(feature_list, feature);
460 if (!found)
461 return NULL;
462 if (feature_list == found || isspace(found[-1])) {
463 const char *value = found + len;
464 /* feature with no value (e.g., "thin-pack") */
465 if (!*value || isspace(*value)) {
466 if (lenp)
467 *lenp = 0;
468 return value;
469 }
470 /* feature with a value (e.g., "agent=git/1.2.3") */
471 else if (*value == '=') {
472 value++;
473 if (lenp)
474 *lenp = strcspn(value, " \t\n");
475 return value;
476 }
477 /*
478 * otherwise we matched a substring of another feature;
479 * keep looking
480 */
481 }
482 feature_list = found + 1;
483 }
484 return NULL;
485 }
486
487 int parse_feature_request(const char *feature_list, const char *feature)
488 {
489 return !!parse_feature_value(feature_list, feature, NULL);
490 }
491
492 const char *server_feature_value(const char *feature, int *len)
493 {
494 return parse_feature_value(server_capabilities_v1, feature, len);
495 }
496
497 int server_supports(const char *feature)
498 {
499 return !!server_feature_value(feature, NULL);
500 }
501
502 enum protocol {
503 PROTO_LOCAL = 1,
504 PROTO_FILE,
505 PROTO_SSH,
506 PROTO_GIT
507 };
508
509 int url_is_local_not_ssh(const char *url)
510 {
511 const char *colon = strchr(url, ':');
512 const char *slash = strchr(url, '/');
513 return !colon || (slash && slash < colon) ||
514 has_dos_drive_prefix(url);
515 }
516
517 static const char *prot_name(enum protocol protocol)
518 {
519 switch (protocol) {
520 case PROTO_LOCAL:
521 case PROTO_FILE:
522 return "file";
523 case PROTO_SSH:
524 return "ssh";
525 case PROTO_GIT:
526 return "git";
527 default:
528 return "unknown protocol";
529 }
530 }
531
532 static enum protocol get_protocol(const char *name)
533 {
534 if (!strcmp(name, "ssh"))
535 return PROTO_SSH;
536 if (!strcmp(name, "git"))
537 return PROTO_GIT;
538 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
539 return PROTO_SSH;
540 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
541 return PROTO_SSH;
542 if (!strcmp(name, "file"))
543 return PROTO_FILE;
544 die(_("protocol '%s' is not supported"), name);
545 }
546
547 static char *host_end(char **hoststart, int removebrackets)
548 {
549 char *host = *hoststart;
550 char *end;
551 char *start = strstr(host, "@[");
552 if (start)
553 start++; /* Jump over '@' */
554 else
555 start = host;
556 if (start[0] == '[') {
557 end = strchr(start + 1, ']');
558 if (end) {
559 if (removebrackets) {
560 *end = 0;
561 memmove(start, start + 1, end - start);
562 end++;
563 }
564 } else
565 end = host;
566 } else
567 end = host;
568 return end;
569 }
570
571 #define STR_(s) # s
572 #define STR(s) STR_(s)
573
574 static void get_host_and_port(char **host, const char **port)
575 {
576 char *colon, *end;
577 end = host_end(host, 1);
578 colon = strchr(end, ':');
579 if (colon) {
580 long portnr = strtol(colon + 1, &end, 10);
581 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
582 *colon = 0;
583 *port = colon + 1;
584 } else if (!colon[1]) {
585 *colon = 0;
586 }
587 }
588 }
589
590 static void enable_keepalive(int sockfd)
591 {
592 int ka = 1;
593
594 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
595 error_errno(_("unable to set SO_KEEPALIVE on socket"));
596 }
597
598 #ifndef NO_IPV6
599
600 static const char *ai_name(const struct addrinfo *ai)
601 {
602 static char addr[NI_MAXHOST];
603 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
604 NI_NUMERICHOST) != 0)
605 xsnprintf(addr, sizeof(addr), "(unknown)");
606
607 return addr;
608 }
609
610 /*
611 * Returns a connected socket() fd, or else die()s.
612 */
613 static int git_tcp_connect_sock(char *host, int flags)
614 {
615 struct strbuf error_message = STRBUF_INIT;
616 int sockfd = -1;
617 const char *port = STR(DEFAULT_GIT_PORT);
618 struct addrinfo hints, *ai0, *ai;
619 int gai;
620 int cnt = 0;
621
622 get_host_and_port(&host, &port);
623 if (!*port)
624 port = "<none>";
625
626 memset(&hints, 0, sizeof(hints));
627 if (flags & CONNECT_IPV4)
628 hints.ai_family = AF_INET;
629 else if (flags & CONNECT_IPV6)
630 hints.ai_family = AF_INET6;
631 hints.ai_socktype = SOCK_STREAM;
632 hints.ai_protocol = IPPROTO_TCP;
633
634 if (flags & CONNECT_VERBOSE)
635 fprintf(stderr, _("Looking up %s ... "), host);
636
637 gai = getaddrinfo(host, port, &hints, &ai);
638 if (gai)
639 die(_("unable to look up %s (port %s) (%s)"), host, port, gai_strerror(gai));
640
641 if (flags & CONNECT_VERBOSE)
642 /* TRANSLATORS: this is the end of "Looking up %s ... " */
643 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
644
645 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
646 sockfd = socket(ai->ai_family,
647 ai->ai_socktype, ai->ai_protocol);
648 if ((sockfd < 0) ||
649 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
650 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
651 host, cnt, ai_name(ai), strerror(errno));
652 if (0 <= sockfd)
653 close(sockfd);
654 sockfd = -1;
655 continue;
656 }
657 if (flags & CONNECT_VERBOSE)
658 fprintf(stderr, "%s ", ai_name(ai));
659 break;
660 }
661
662 freeaddrinfo(ai0);
663
664 if (sockfd < 0)
665 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
666
667 enable_keepalive(sockfd);
668
669 if (flags & CONNECT_VERBOSE)
670 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
671 fprintf_ln(stderr, _("done."));
672
673 strbuf_release(&error_message);
674
675 return sockfd;
676 }
677
678 #else /* NO_IPV6 */
679
680 /*
681 * Returns a connected socket() fd, or else die()s.
682 */
683 static int git_tcp_connect_sock(char *host, int flags)
684 {
685 struct strbuf error_message = STRBUF_INIT;
686 int sockfd = -1;
687 const char *port = STR(DEFAULT_GIT_PORT);
688 char *ep;
689 struct hostent *he;
690 struct sockaddr_in sa;
691 char **ap;
692 unsigned int nport;
693 int cnt;
694
695 get_host_and_port(&host, &port);
696
697 if (flags & CONNECT_VERBOSE)
698 fprintf(stderr, _("Looking up %s ... "), host);
699
700 he = gethostbyname(host);
701 if (!he)
702 die(_("unable to look up %s (%s)"), host, hstrerror(h_errno));
703 nport = strtoul(port, &ep, 10);
704 if ( ep == port || *ep ) {
705 /* Not numeric */
706 struct servent *se = getservbyname(port,"tcp");
707 if ( !se )
708 die(_("unknown port %s"), port);
709 nport = se->s_port;
710 }
711
712 if (flags & CONNECT_VERBOSE)
713 /* TRANSLATORS: this is the end of "Looking up %s ... " */
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 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
748 fprintf_ln(stderr, _("done."));
749
750 return sockfd;
751 }
752
753 #endif /* NO_IPV6 */
754
755
756 /*
757 * Dummy child_process returned by git_connect() if the transport protocol
758 * does not need fork(2).
759 */
760 static struct child_process no_fork = CHILD_PROCESS_INIT;
761
762 int git_connection_is_socket(struct child_process *conn)
763 {
764 return conn == &no_fork;
765 }
766
767 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
768 {
769 int sockfd = git_tcp_connect_sock(host, flags);
770
771 fd[0] = sockfd;
772 fd[1] = dup(sockfd);
773
774 return &no_fork;
775 }
776
777
778 static char *git_proxy_command;
779
780 static int git_proxy_command_options(const char *var, const char *value,
781 void *cb)
782 {
783 if (!strcmp(var, "core.gitproxy")) {
784 const char *for_pos;
785 int matchlen = -1;
786 int hostlen;
787 const char *rhost_name = cb;
788 int rhost_len = strlen(rhost_name);
789
790 if (git_proxy_command)
791 return 0;
792 if (!value)
793 return config_error_nonbool(var);
794 /* [core]
795 * ;# matches www.kernel.org as well
796 * gitproxy = netcatter-1 for kernel.org
797 * gitproxy = netcatter-2 for sample.xz
798 * gitproxy = netcatter-default
799 */
800 for_pos = strstr(value, " for ");
801 if (!for_pos)
802 /* matches everybody */
803 matchlen = strlen(value);
804 else {
805 hostlen = strlen(for_pos + 5);
806 if (rhost_len < hostlen)
807 matchlen = -1;
808 else if (!strncmp(for_pos + 5,
809 rhost_name + rhost_len - hostlen,
810 hostlen) &&
811 ((rhost_len == hostlen) ||
812 rhost_name[rhost_len - hostlen -1] == '.'))
813 matchlen = for_pos - value;
814 else
815 matchlen = -1;
816 }
817 if (0 <= matchlen) {
818 /* core.gitproxy = none for kernel.org */
819 if (matchlen == 4 &&
820 !memcmp(value, "none", 4))
821 matchlen = 0;
822 git_proxy_command = xmemdupz(value, matchlen);
823 }
824 return 0;
825 }
826
827 return git_default_config(var, value, cb);
828 }
829
830 static int git_use_proxy(const char *host)
831 {
832 git_proxy_command = getenv("GIT_PROXY_COMMAND");
833 git_config(git_proxy_command_options, (void*)host);
834 return (git_proxy_command && *git_proxy_command);
835 }
836
837 static struct child_process *git_proxy_connect(int fd[2], char *host)
838 {
839 const char *port = STR(DEFAULT_GIT_PORT);
840 struct child_process *proxy;
841
842 get_host_and_port(&host, &port);
843
844 if (looks_like_command_line_option(host))
845 die(_("strange hostname '%s' blocked"), host);
846 if (looks_like_command_line_option(port))
847 die(_("strange port '%s' blocked"), port);
848
849 proxy = xmalloc(sizeof(*proxy));
850 child_process_init(proxy);
851 argv_array_push(&proxy->args, git_proxy_command);
852 argv_array_push(&proxy->args, host);
853 argv_array_push(&proxy->args, port);
854 proxy->in = -1;
855 proxy->out = -1;
856 if (start_command(proxy))
857 die(_("cannot start proxy %s"), git_proxy_command);
858 fd[0] = proxy->out; /* read from proxy stdout */
859 fd[1] = proxy->in; /* write to proxy stdin */
860 return proxy;
861 }
862
863 static char *get_port(char *host)
864 {
865 char *end;
866 char *p = strchr(host, ':');
867
868 if (p) {
869 long port = strtol(p + 1, &end, 10);
870 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
871 *p = '\0';
872 return p+1;
873 }
874 }
875
876 return NULL;
877 }
878
879 /*
880 * Extract protocol and relevant parts from the specified connection URL.
881 * The caller must free() the returned strings.
882 */
883 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
884 char **ret_path)
885 {
886 char *url;
887 char *host, *path;
888 char *end;
889 int separator = '/';
890 enum protocol protocol = PROTO_LOCAL;
891
892 if (is_url(url_orig))
893 url = url_decode(url_orig);
894 else
895 url = xstrdup(url_orig);
896
897 host = strstr(url, "://");
898 if (host) {
899 *host = '\0';
900 protocol = get_protocol(url);
901 host += 3;
902 } else {
903 host = url;
904 if (!url_is_local_not_ssh(url)) {
905 protocol = PROTO_SSH;
906 separator = ':';
907 }
908 }
909
910 /*
911 * Don't do destructive transforms as protocol code does
912 * '[]' unwrapping in get_host_and_port()
913 */
914 end = host_end(&host, 0);
915
916 if (protocol == PROTO_LOCAL)
917 path = end;
918 else if (protocol == PROTO_FILE && *host != '/' &&
919 !has_dos_drive_prefix(host) &&
920 offset_1st_component(host - 2) > 1)
921 path = host - 2; /* include the leading "//" */
922 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
923 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
924 else
925 path = strchr(end, separator);
926
927 if (!path || !*path)
928 die(_("no path specified; see 'git help pull' for valid url syntax"));
929
930 /*
931 * null-terminate hostname and point path to ~ for URL's like this:
932 * ssh://host.xz/~user/repo
933 */
934
935 end = path; /* Need to \0 terminate host here */
936 if (separator == ':')
937 path++; /* path starts after ':' */
938 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
939 if (path[1] == '~')
940 path++;
941 }
942
943 path = xstrdup(path);
944 *end = '\0';
945
946 *ret_host = xstrdup(host);
947 *ret_path = path;
948 free(url);
949 return protocol;
950 }
951
952 static const char *get_ssh_command(void)
953 {
954 const char *ssh;
955
956 if ((ssh = getenv("GIT_SSH_COMMAND")))
957 return ssh;
958
959 if (!git_config_get_string_const("core.sshcommand", &ssh))
960 return ssh;
961
962 return NULL;
963 }
964
965 enum ssh_variant {
966 VARIANT_AUTO,
967 VARIANT_SIMPLE,
968 VARIANT_SSH,
969 VARIANT_PLINK,
970 VARIANT_PUTTY,
971 VARIANT_TORTOISEPLINK,
972 };
973
974 static void override_ssh_variant(enum ssh_variant *ssh_variant)
975 {
976 const char *variant = getenv("GIT_SSH_VARIANT");
977
978 if (!variant && git_config_get_string_const("ssh.variant", &variant))
979 return;
980
981 if (!strcmp(variant, "auto"))
982 *ssh_variant = VARIANT_AUTO;
983 else if (!strcmp(variant, "plink"))
984 *ssh_variant = VARIANT_PLINK;
985 else if (!strcmp(variant, "putty"))
986 *ssh_variant = VARIANT_PUTTY;
987 else if (!strcmp(variant, "tortoiseplink"))
988 *ssh_variant = VARIANT_TORTOISEPLINK;
989 else if (!strcmp(variant, "simple"))
990 *ssh_variant = VARIANT_SIMPLE;
991 else
992 *ssh_variant = VARIANT_SSH;
993 }
994
995 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
996 int is_cmdline)
997 {
998 enum ssh_variant ssh_variant = VARIANT_AUTO;
999 const char *variant;
1000 char *p = NULL;
1001
1002 override_ssh_variant(&ssh_variant);
1003
1004 if (ssh_variant != VARIANT_AUTO)
1005 return ssh_variant;
1006
1007 if (!is_cmdline) {
1008 p = xstrdup(ssh_command);
1009 variant = basename(p);
1010 } else {
1011 const char **ssh_argv;
1012
1013 p = xstrdup(ssh_command);
1014 if (split_cmdline(p, &ssh_argv) > 0) {
1015 variant = basename((char *)ssh_argv[0]);
1016 /*
1017 * At this point, variant points into the buffer
1018 * referenced by p, hence we do not need ssh_argv
1019 * any longer.
1020 */
1021 free(ssh_argv);
1022 } else {
1023 free(p);
1024 return ssh_variant;
1025 }
1026 }
1027
1028 if (!strcasecmp(variant, "ssh") ||
1029 !strcasecmp(variant, "ssh.exe"))
1030 ssh_variant = VARIANT_SSH;
1031 else if (!strcasecmp(variant, "plink") ||
1032 !strcasecmp(variant, "plink.exe"))
1033 ssh_variant = VARIANT_PLINK;
1034 else if (!strcasecmp(variant, "tortoiseplink") ||
1035 !strcasecmp(variant, "tortoiseplink.exe"))
1036 ssh_variant = VARIANT_TORTOISEPLINK;
1037
1038 free(p);
1039 return ssh_variant;
1040 }
1041
1042 /*
1043 * Open a connection using Git's native protocol.
1044 *
1045 * The caller is responsible for freeing hostandport, but this function may
1046 * modify it (for example, to truncate it to remove the port part).
1047 */
1048 static struct child_process *git_connect_git(int fd[2], char *hostandport,
1049 const char *path, const char *prog,
1050 enum protocol_version version,
1051 int flags)
1052 {
1053 struct child_process *conn;
1054 struct strbuf request = STRBUF_INIT;
1055 /*
1056 * Set up virtual host information based on where we will
1057 * connect, unless the user has overridden us in
1058 * the environment.
1059 */
1060 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
1061 if (target_host)
1062 target_host = xstrdup(target_host);
1063 else
1064 target_host = xstrdup(hostandport);
1065
1066 transport_check_allowed("git");
1067
1068 /*
1069 * These underlying connection commands die() if they
1070 * cannot connect.
1071 */
1072 if (git_use_proxy(hostandport))
1073 conn = git_proxy_connect(fd, hostandport);
1074 else
1075 conn = git_tcp_connect(fd, hostandport, flags);
1076 /*
1077 * Separate original protocol components prog and path
1078 * from extended host header with a NUL byte.
1079 *
1080 * Note: Do not add any other headers here! Doing so
1081 * will cause older git-daemon servers to crash.
1082 */
1083 strbuf_addf(&request,
1084 "%s %s%chost=%s%c",
1085 prog, path, 0,
1086 target_host, 0);
1087
1088 /* If using a new version put that stuff here after a second null byte */
1089 if (version > 0) {
1090 strbuf_addch(&request, '\0');
1091 strbuf_addf(&request, "version=%d%c",
1092 version, '\0');
1093 }
1094
1095 packet_write(fd[1], request.buf, request.len);
1096
1097 free(target_host);
1098 strbuf_release(&request);
1099 return conn;
1100 }
1101
1102 /*
1103 * Append the appropriate environment variables to `env` and options to
1104 * `args` for running ssh in Git's SSH-tunneled transport.
1105 */
1106 static void push_ssh_options(struct argv_array *args, struct argv_array *env,
1107 enum ssh_variant variant, const char *port,
1108 enum protocol_version version, int flags)
1109 {
1110 if (variant == VARIANT_SSH &&
1111 version > 0) {
1112 argv_array_push(args, "-o");
1113 argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
1114 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1115 version);
1116 }
1117
1118 if (flags & CONNECT_IPV4) {
1119 switch (variant) {
1120 case VARIANT_AUTO:
1121 BUG("VARIANT_AUTO passed to push_ssh_options");
1122 case VARIANT_SIMPLE:
1123 die(_("ssh variant 'simple' does not support -4"));
1124 case VARIANT_SSH:
1125 case VARIANT_PLINK:
1126 case VARIANT_PUTTY:
1127 case VARIANT_TORTOISEPLINK:
1128 argv_array_push(args, "-4");
1129 }
1130 } else if (flags & CONNECT_IPV6) {
1131 switch (variant) {
1132 case VARIANT_AUTO:
1133 BUG("VARIANT_AUTO passed to push_ssh_options");
1134 case VARIANT_SIMPLE:
1135 die(_("ssh variant 'simple' does not support -6"));
1136 case VARIANT_SSH:
1137 case VARIANT_PLINK:
1138 case VARIANT_PUTTY:
1139 case VARIANT_TORTOISEPLINK:
1140 argv_array_push(args, "-6");
1141 }
1142 }
1143
1144 if (variant == VARIANT_TORTOISEPLINK)
1145 argv_array_push(args, "-batch");
1146
1147 if (port) {
1148 switch (variant) {
1149 case VARIANT_AUTO:
1150 BUG("VARIANT_AUTO passed to push_ssh_options");
1151 case VARIANT_SIMPLE:
1152 die(_("ssh variant 'simple' does not support setting port"));
1153 case VARIANT_SSH:
1154 argv_array_push(args, "-p");
1155 break;
1156 case VARIANT_PLINK:
1157 case VARIANT_PUTTY:
1158 case VARIANT_TORTOISEPLINK:
1159 argv_array_push(args, "-P");
1160 }
1161
1162 argv_array_push(args, port);
1163 }
1164 }
1165
1166 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
1167 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
1168 const char *port, enum protocol_version version,
1169 int flags)
1170 {
1171 const char *ssh;
1172 enum ssh_variant variant;
1173
1174 if (looks_like_command_line_option(ssh_host))
1175 die(_("strange hostname '%s' blocked"), ssh_host);
1176
1177 ssh = get_ssh_command();
1178 if (ssh) {
1179 variant = determine_ssh_variant(ssh, 1);
1180 } else {
1181 /*
1182 * GIT_SSH is the no-shell version of
1183 * GIT_SSH_COMMAND (and must remain so for
1184 * historical compatibility).
1185 */
1186 conn->use_shell = 0;
1187
1188 ssh = getenv("GIT_SSH");
1189 if (!ssh)
1190 ssh = "ssh";
1191 variant = determine_ssh_variant(ssh, 0);
1192 }
1193
1194 if (variant == VARIANT_AUTO) {
1195 struct child_process detect = CHILD_PROCESS_INIT;
1196
1197 detect.use_shell = conn->use_shell;
1198 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1199
1200 argv_array_push(&detect.args, ssh);
1201 argv_array_push(&detect.args, "-G");
1202 push_ssh_options(&detect.args, &detect.env_array,
1203 VARIANT_SSH, port, version, flags);
1204 argv_array_push(&detect.args, ssh_host);
1205
1206 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1207 }
1208
1209 argv_array_push(&conn->args, ssh);
1210 push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
1211 argv_array_push(&conn->args, ssh_host);
1212 }
1213
1214 /*
1215 * This returns the dummy child_process `no_fork` if the transport protocol
1216 * does not need fork(2), or a struct child_process object if it does. Once
1217 * done, finish the connection with finish_connect() with the value returned
1218 * from this function (it is safe to call finish_connect() with NULL to
1219 * support the former case).
1220 *
1221 * If it returns, the connect is successful; it just dies on errors (this
1222 * will hopefully be changed in a libification effort, to return NULL when
1223 * the connection failed).
1224 */
1225 struct child_process *git_connect(int fd[2], const char *url,
1226 const char *prog, int flags)
1227 {
1228 char *hostandport, *path;
1229 struct child_process *conn;
1230 enum protocol protocol;
1231 enum protocol_version version = get_protocol_version_config();
1232
1233 /*
1234 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
1235 * to perform a push, then fallback to v0 since the client doesn't know
1236 * how to push yet using v2.
1237 */
1238 if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
1239 version = protocol_v0;
1240
1241 /* Without this we cannot rely on waitpid() to tell
1242 * what happened to our children.
1243 */
1244 signal(SIGCHLD, SIG_DFL);
1245
1246 protocol = parse_connect_url(url, &hostandport, &path);
1247 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1248 printf("Diag: url=%s\n", url ? url : "NULL");
1249 printf("Diag: protocol=%s\n", prot_name(protocol));
1250 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1251 printf("Diag: path=%s\n", path ? path : "NULL");
1252 conn = NULL;
1253 } else if (protocol == PROTO_GIT) {
1254 conn = git_connect_git(fd, hostandport, path, prog, version, flags);
1255 conn->trace2_child_class = "transport/git";
1256 } else {
1257 struct strbuf cmd = STRBUF_INIT;
1258 const char *const *var;
1259
1260 conn = xmalloc(sizeof(*conn));
1261 child_process_init(conn);
1262
1263 if (looks_like_command_line_option(path))
1264 die(_("strange pathname '%s' blocked"), path);
1265
1266 strbuf_addstr(&cmd, prog);
1267 strbuf_addch(&cmd, ' ');
1268 sq_quote_buf(&cmd, path);
1269
1270 /* remove repo-local variables from the environment */
1271 for (var = local_repo_env; *var; var++)
1272 argv_array_push(&conn->env_array, *var);
1273
1274 conn->use_shell = 1;
1275 conn->in = conn->out = -1;
1276 if (protocol == PROTO_SSH) {
1277 char *ssh_host = hostandport;
1278 const char *port = NULL;
1279 transport_check_allowed("ssh");
1280 get_host_and_port(&ssh_host, &port);
1281
1282 if (!port)
1283 port = get_port(ssh_host);
1284
1285 if (flags & CONNECT_DIAG_URL) {
1286 printf("Diag: url=%s\n", url ? url : "NULL");
1287 printf("Diag: protocol=%s\n", prot_name(protocol));
1288 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1289 printf("Diag: port=%s\n", port ? port : "NONE");
1290 printf("Diag: path=%s\n", path ? path : "NULL");
1291
1292 free(hostandport);
1293 free(path);
1294 free(conn);
1295 strbuf_release(&cmd);
1296 return NULL;
1297 }
1298 conn->trace2_child_class = "transport/ssh";
1299 fill_ssh_args(conn, ssh_host, port, version, flags);
1300 } else {
1301 transport_check_allowed("file");
1302 conn->trace2_child_class = "transport/file";
1303 if (version > 0) {
1304 argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1305 version);
1306 }
1307 }
1308 argv_array_push(&conn->args, cmd.buf);
1309
1310 if (start_command(conn))
1311 die(_("unable to fork"));
1312
1313 fd[0] = conn->out; /* read from child's stdout */
1314 fd[1] = conn->in; /* write to child's stdin */
1315 strbuf_release(&cmd);
1316 }
1317 free(hostandport);
1318 free(path);
1319 return conn;
1320 }
1321
1322 int finish_connect(struct child_process *conn)
1323 {
1324 int code;
1325 if (!conn || git_connection_is_socket(conn))
1326 return 0;
1327
1328 code = finish_command(conn);
1329 free(conn);
1330 return code;
1331 }