ls-refs: filter refs using namespace-stripped name
[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 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 /* TRANSLATORS: this is the end of "Looking up %s ... " */
646 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
647
648 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
649 sockfd = socket(ai->ai_family,
650 ai->ai_socktype, ai->ai_protocol);
651 if ((sockfd < 0) ||
652 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
653 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
654 host, cnt, ai_name(ai), strerror(errno));
655 if (0 <= sockfd)
656 close(sockfd);
657 sockfd = -1;
658 continue;
659 }
660 if (flags & CONNECT_VERBOSE)
661 fprintf(stderr, "%s ", ai_name(ai));
662 break;
663 }
664
665 freeaddrinfo(ai0);
666
667 if (sockfd < 0)
668 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
669
670 enable_keepalive(sockfd);
671
672 if (flags & CONNECT_VERBOSE)
673 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
674 fprintf_ln(stderr, _("done."));
675
676 strbuf_release(&error_message);
677
678 return sockfd;
679 }
680
681 #else /* NO_IPV6 */
682
683 /*
684 * Returns a connected socket() fd, or else die()s.
685 */
686 static int git_tcp_connect_sock(char *host, int flags)
687 {
688 struct strbuf error_message = STRBUF_INIT;
689 int sockfd = -1;
690 const char *port = STR(DEFAULT_GIT_PORT);
691 char *ep;
692 struct hostent *he;
693 struct sockaddr_in sa;
694 char **ap;
695 unsigned int nport;
696 int cnt;
697
698 get_host_and_port(&host, &port);
699
700 if (flags & CONNECT_VERBOSE)
701 fprintf(stderr, _("Looking up %s ... "), host);
702
703 he = gethostbyname(host);
704 if (!he)
705 die(_("unable to look up %s (%s)"), host, hstrerror(h_errno));
706 nport = strtoul(port, &ep, 10);
707 if ( ep == port || *ep ) {
708 /* Not numeric */
709 struct servent *se = getservbyname(port,"tcp");
710 if ( !se )
711 die(_("unknown port %s"), port);
712 nport = se->s_port;
713 }
714
715 if (flags & CONNECT_VERBOSE)
716 /* TRANSLATORS: this is the end of "Looking up %s ... " */
717 fprintf(stderr, _("done.\nConnecting to %s (port %s) ... "), host, port);
718
719 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
720 memset(&sa, 0, sizeof sa);
721 sa.sin_family = he->h_addrtype;
722 sa.sin_port = htons(nport);
723 memcpy(&sa.sin_addr, *ap, he->h_length);
724
725 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
726 if ((sockfd < 0) ||
727 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
728 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
729 host,
730 cnt,
731 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
732 strerror(errno));
733 if (0 <= sockfd)
734 close(sockfd);
735 sockfd = -1;
736 continue;
737 }
738 if (flags & CONNECT_VERBOSE)
739 fprintf(stderr, "%s ",
740 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
741 break;
742 }
743
744 if (sockfd < 0)
745 die(_("unable to connect to %s:\n%s"), host, error_message.buf);
746
747 enable_keepalive(sockfd);
748
749 if (flags & CONNECT_VERBOSE)
750 /* TRANSLATORS: this is the end of "Connecting to %s (port %s) ... " */
751 fprintf_ln(stderr, _("done."));
752
753 return sockfd;
754 }
755
756 #endif /* NO_IPV6 */
757
758
759 /*
760 * Dummy child_process returned by git_connect() if the transport protocol
761 * does not need fork(2).
762 */
763 static struct child_process no_fork = CHILD_PROCESS_INIT;
764
765 int git_connection_is_socket(struct child_process *conn)
766 {
767 return conn == &no_fork;
768 }
769
770 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
771 {
772 int sockfd = git_tcp_connect_sock(host, flags);
773
774 fd[0] = sockfd;
775 fd[1] = dup(sockfd);
776
777 return &no_fork;
778 }
779
780
781 static char *git_proxy_command;
782
783 static int git_proxy_command_options(const char *var, const char *value,
784 void *cb)
785 {
786 if (!strcmp(var, "core.gitproxy")) {
787 const char *for_pos;
788 int matchlen = -1;
789 int hostlen;
790 const char *rhost_name = cb;
791 int rhost_len = strlen(rhost_name);
792
793 if (git_proxy_command)
794 return 0;
795 if (!value)
796 return config_error_nonbool(var);
797 /* [core]
798 * ;# matches www.kernel.org as well
799 * gitproxy = netcatter-1 for kernel.org
800 * gitproxy = netcatter-2 for sample.xz
801 * gitproxy = netcatter-default
802 */
803 for_pos = strstr(value, " for ");
804 if (!for_pos)
805 /* matches everybody */
806 matchlen = strlen(value);
807 else {
808 hostlen = strlen(for_pos + 5);
809 if (rhost_len < hostlen)
810 matchlen = -1;
811 else if (!strncmp(for_pos + 5,
812 rhost_name + rhost_len - hostlen,
813 hostlen) &&
814 ((rhost_len == hostlen) ||
815 rhost_name[rhost_len - hostlen -1] == '.'))
816 matchlen = for_pos - value;
817 else
818 matchlen = -1;
819 }
820 if (0 <= matchlen) {
821 /* core.gitproxy = none for kernel.org */
822 if (matchlen == 4 &&
823 !memcmp(value, "none", 4))
824 matchlen = 0;
825 git_proxy_command = xmemdupz(value, matchlen);
826 }
827 return 0;
828 }
829
830 return git_default_config(var, value, cb);
831 }
832
833 static int git_use_proxy(const char *host)
834 {
835 git_proxy_command = getenv("GIT_PROXY_COMMAND");
836 git_config(git_proxy_command_options, (void*)host);
837 return (git_proxy_command && *git_proxy_command);
838 }
839
840 static struct child_process *git_proxy_connect(int fd[2], char *host)
841 {
842 const char *port = STR(DEFAULT_GIT_PORT);
843 struct child_process *proxy;
844
845 get_host_and_port(&host, &port);
846
847 if (looks_like_command_line_option(host))
848 die(_("strange hostname '%s' blocked"), host);
849 if (looks_like_command_line_option(port))
850 die(_("strange port '%s' blocked"), port);
851
852 proxy = xmalloc(sizeof(*proxy));
853 child_process_init(proxy);
854 argv_array_push(&proxy->args, git_proxy_command);
855 argv_array_push(&proxy->args, host);
856 argv_array_push(&proxy->args, port);
857 proxy->in = -1;
858 proxy->out = -1;
859 if (start_command(proxy))
860 die(_("cannot start proxy %s"), git_proxy_command);
861 fd[0] = proxy->out; /* read from proxy stdout */
862 fd[1] = proxy->in; /* write to proxy stdin */
863 return proxy;
864 }
865
866 static char *get_port(char *host)
867 {
868 char *end;
869 char *p = strchr(host, ':');
870
871 if (p) {
872 long port = strtol(p + 1, &end, 10);
873 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
874 *p = '\0';
875 return p+1;
876 }
877 }
878
879 return NULL;
880 }
881
882 /*
883 * Extract protocol and relevant parts from the specified connection URL.
884 * The caller must free() the returned strings.
885 */
886 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
887 char **ret_path)
888 {
889 char *url;
890 char *host, *path;
891 char *end;
892 int separator = '/';
893 enum protocol protocol = PROTO_LOCAL;
894
895 if (is_url(url_orig))
896 url = url_decode(url_orig);
897 else
898 url = xstrdup(url_orig);
899
900 host = strstr(url, "://");
901 if (host) {
902 *host = '\0';
903 protocol = get_protocol(url);
904 host += 3;
905 } else {
906 host = url;
907 if (!url_is_local_not_ssh(url)) {
908 protocol = PROTO_SSH;
909 separator = ':';
910 }
911 }
912
913 /*
914 * Don't do destructive transforms as protocol code does
915 * '[]' unwrapping in get_host_and_port()
916 */
917 end = host_end(&host, 0);
918
919 if (protocol == PROTO_LOCAL)
920 path = end;
921 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
922 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
923 else
924 path = strchr(end, separator);
925
926 if (!path || !*path)
927 die(_("no path specified; see 'git help pull' for valid url syntax"));
928
929 /*
930 * null-terminate hostname and point path to ~ for URL's like this:
931 * ssh://host.xz/~user/repo
932 */
933
934 end = path; /* Need to \0 terminate host here */
935 if (separator == ':')
936 path++; /* path starts after ':' */
937 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
938 if (path[1] == '~')
939 path++;
940 }
941
942 path = xstrdup(path);
943 *end = '\0';
944
945 *ret_host = xstrdup(host);
946 *ret_path = path;
947 free(url);
948 return protocol;
949 }
950
951 static const char *get_ssh_command(void)
952 {
953 const char *ssh;
954
955 if ((ssh = getenv("GIT_SSH_COMMAND")))
956 return ssh;
957
958 if (!git_config_get_string_const("core.sshcommand", &ssh))
959 return ssh;
960
961 return NULL;
962 }
963
964 enum ssh_variant {
965 VARIANT_AUTO,
966 VARIANT_SIMPLE,
967 VARIANT_SSH,
968 VARIANT_PLINK,
969 VARIANT_PUTTY,
970 VARIANT_TORTOISEPLINK,
971 };
972
973 static void override_ssh_variant(enum ssh_variant *ssh_variant)
974 {
975 const char *variant = getenv("GIT_SSH_VARIANT");
976
977 if (!variant && git_config_get_string_const("ssh.variant", &variant))
978 return;
979
980 if (!strcmp(variant, "auto"))
981 *ssh_variant = VARIANT_AUTO;
982 else if (!strcmp(variant, "plink"))
983 *ssh_variant = VARIANT_PLINK;
984 else if (!strcmp(variant, "putty"))
985 *ssh_variant = VARIANT_PUTTY;
986 else if (!strcmp(variant, "tortoiseplink"))
987 *ssh_variant = VARIANT_TORTOISEPLINK;
988 else if (!strcmp(variant, "simple"))
989 *ssh_variant = VARIANT_SIMPLE;
990 else
991 *ssh_variant = VARIANT_SSH;
992 }
993
994 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
995 int is_cmdline)
996 {
997 enum ssh_variant ssh_variant = VARIANT_AUTO;
998 const char *variant;
999 char *p = NULL;
1000
1001 override_ssh_variant(&ssh_variant);
1002
1003 if (ssh_variant != VARIANT_AUTO)
1004 return ssh_variant;
1005
1006 if (!is_cmdline) {
1007 p = xstrdup(ssh_command);
1008 variant = basename(p);
1009 } else {
1010 const char **ssh_argv;
1011
1012 p = xstrdup(ssh_command);
1013 if (split_cmdline(p, &ssh_argv) > 0) {
1014 variant = basename((char *)ssh_argv[0]);
1015 /*
1016 * At this point, variant points into the buffer
1017 * referenced by p, hence we do not need ssh_argv
1018 * any longer.
1019 */
1020 free(ssh_argv);
1021 } else {
1022 free(p);
1023 return ssh_variant;
1024 }
1025 }
1026
1027 if (!strcasecmp(variant, "ssh") ||
1028 !strcasecmp(variant, "ssh.exe"))
1029 ssh_variant = VARIANT_SSH;
1030 else if (!strcasecmp(variant, "plink") ||
1031 !strcasecmp(variant, "plink.exe"))
1032 ssh_variant = VARIANT_PLINK;
1033 else if (!strcasecmp(variant, "tortoiseplink") ||
1034 !strcasecmp(variant, "tortoiseplink.exe"))
1035 ssh_variant = VARIANT_TORTOISEPLINK;
1036
1037 free(p);
1038 return ssh_variant;
1039 }
1040
1041 /*
1042 * Open a connection using Git's native protocol.
1043 *
1044 * The caller is responsible for freeing hostandport, but this function may
1045 * modify it (for example, to truncate it to remove the port part).
1046 */
1047 static struct child_process *git_connect_git(int fd[2], char *hostandport,
1048 const char *path, const char *prog,
1049 enum protocol_version version,
1050 int flags)
1051 {
1052 struct child_process *conn;
1053 struct strbuf request = STRBUF_INIT;
1054 /*
1055 * Set up virtual host information based on where we will
1056 * connect, unless the user has overridden us in
1057 * the environment.
1058 */
1059 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
1060 if (target_host)
1061 target_host = xstrdup(target_host);
1062 else
1063 target_host = xstrdup(hostandport);
1064
1065 transport_check_allowed("git");
1066
1067 /*
1068 * These underlying connection commands die() if they
1069 * cannot connect.
1070 */
1071 if (git_use_proxy(hostandport))
1072 conn = git_proxy_connect(fd, hostandport);
1073 else
1074 conn = git_tcp_connect(fd, hostandport, flags);
1075 /*
1076 * Separate original protocol components prog and path
1077 * from extended host header with a NUL byte.
1078 *
1079 * Note: Do not add any other headers here! Doing so
1080 * will cause older git-daemon servers to crash.
1081 */
1082 strbuf_addf(&request,
1083 "%s %s%chost=%s%c",
1084 prog, path, 0,
1085 target_host, 0);
1086
1087 /* If using a new version put that stuff here after a second null byte */
1088 if (version > 0) {
1089 strbuf_addch(&request, '\0');
1090 strbuf_addf(&request, "version=%d%c",
1091 version, '\0');
1092 }
1093
1094 packet_write(fd[1], request.buf, request.len);
1095
1096 free(target_host);
1097 strbuf_release(&request);
1098 return conn;
1099 }
1100
1101 /*
1102 * Append the appropriate environment variables to `env` and options to
1103 * `args` for running ssh in Git's SSH-tunneled transport.
1104 */
1105 static void push_ssh_options(struct argv_array *args, struct argv_array *env,
1106 enum ssh_variant variant, const char *port,
1107 enum protocol_version version, int flags)
1108 {
1109 if (variant == VARIANT_SSH &&
1110 version > 0) {
1111 argv_array_push(args, "-o");
1112 argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
1113 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1114 version);
1115 }
1116
1117 if (flags & CONNECT_IPV4) {
1118 switch (variant) {
1119 case VARIANT_AUTO:
1120 BUG("VARIANT_AUTO passed to push_ssh_options");
1121 case VARIANT_SIMPLE:
1122 die(_("ssh variant 'simple' does not support -4"));
1123 case VARIANT_SSH:
1124 case VARIANT_PLINK:
1125 case VARIANT_PUTTY:
1126 case VARIANT_TORTOISEPLINK:
1127 argv_array_push(args, "-4");
1128 }
1129 } else if (flags & CONNECT_IPV6) {
1130 switch (variant) {
1131 case VARIANT_AUTO:
1132 BUG("VARIANT_AUTO passed to push_ssh_options");
1133 case VARIANT_SIMPLE:
1134 die(_("ssh variant 'simple' does not support -6"));
1135 case VARIANT_SSH:
1136 case VARIANT_PLINK:
1137 case VARIANT_PUTTY:
1138 case VARIANT_TORTOISEPLINK:
1139 argv_array_push(args, "-6");
1140 }
1141 }
1142
1143 if (variant == VARIANT_TORTOISEPLINK)
1144 argv_array_push(args, "-batch");
1145
1146 if (port) {
1147 switch (variant) {
1148 case VARIANT_AUTO:
1149 BUG("VARIANT_AUTO passed to push_ssh_options");
1150 case VARIANT_SIMPLE:
1151 die(_("ssh variant 'simple' does not support setting port"));
1152 case VARIANT_SSH:
1153 argv_array_push(args, "-p");
1154 break;
1155 case VARIANT_PLINK:
1156 case VARIANT_PUTTY:
1157 case VARIANT_TORTOISEPLINK:
1158 argv_array_push(args, "-P");
1159 }
1160
1161 argv_array_push(args, port);
1162 }
1163 }
1164
1165 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
1166 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
1167 const char *port, enum protocol_version version,
1168 int flags)
1169 {
1170 const char *ssh;
1171 enum ssh_variant variant;
1172
1173 if (looks_like_command_line_option(ssh_host))
1174 die(_("strange hostname '%s' blocked"), ssh_host);
1175
1176 ssh = get_ssh_command();
1177 if (ssh) {
1178 variant = determine_ssh_variant(ssh, 1);
1179 } else {
1180 /*
1181 * GIT_SSH is the no-shell version of
1182 * GIT_SSH_COMMAND (and must remain so for
1183 * historical compatibility).
1184 */
1185 conn->use_shell = 0;
1186
1187 ssh = getenv("GIT_SSH");
1188 if (!ssh)
1189 ssh = "ssh";
1190 variant = determine_ssh_variant(ssh, 0);
1191 }
1192
1193 if (variant == VARIANT_AUTO) {
1194 struct child_process detect = CHILD_PROCESS_INIT;
1195
1196 detect.use_shell = conn->use_shell;
1197 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1198
1199 argv_array_push(&detect.args, ssh);
1200 argv_array_push(&detect.args, "-G");
1201 push_ssh_options(&detect.args, &detect.env_array,
1202 VARIANT_SSH, port, version, flags);
1203 argv_array_push(&detect.args, ssh_host);
1204
1205 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1206 }
1207
1208 argv_array_push(&conn->args, ssh);
1209 push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
1210 argv_array_push(&conn->args, ssh_host);
1211 }
1212
1213 /*
1214 * This returns the dummy child_process `no_fork` if the transport protocol
1215 * does not need fork(2), or a struct child_process object if it does. Once
1216 * done, finish the connection with finish_connect() with the value returned
1217 * from this function (it is safe to call finish_connect() with NULL to
1218 * support the former case).
1219 *
1220 * If it returns, the connect is successful; it just dies on errors (this
1221 * will hopefully be changed in a libification effort, to return NULL when
1222 * the connection failed).
1223 */
1224 struct child_process *git_connect(int fd[2], const char *url,
1225 const char *prog, int flags)
1226 {
1227 char *hostandport, *path;
1228 struct child_process *conn;
1229 enum protocol protocol;
1230 enum protocol_version version = get_protocol_version_config();
1231
1232 /*
1233 * NEEDSWORK: If we are trying to use protocol v2 and we are planning
1234 * to perform a push, then fallback to v0 since the client doesn't know
1235 * how to push yet using v2.
1236 */
1237 if (version == protocol_v2 && !strcmp("git-receive-pack", prog))
1238 version = protocol_v0;
1239
1240 /* Without this we cannot rely on waitpid() to tell
1241 * what happened to our children.
1242 */
1243 signal(SIGCHLD, SIG_DFL);
1244
1245 protocol = parse_connect_url(url, &hostandport, &path);
1246 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1247 printf("Diag: url=%s\n", url ? url : "NULL");
1248 printf("Diag: protocol=%s\n", prot_name(protocol));
1249 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1250 printf("Diag: path=%s\n", path ? path : "NULL");
1251 conn = NULL;
1252 } else if (protocol == PROTO_GIT) {
1253 conn = git_connect_git(fd, hostandport, path, prog, version, flags);
1254 } else {
1255 struct strbuf cmd = STRBUF_INIT;
1256 const char *const *var;
1257
1258 conn = xmalloc(sizeof(*conn));
1259 child_process_init(conn);
1260
1261 if (looks_like_command_line_option(path))
1262 die(_("strange pathname '%s' blocked"), path);
1263
1264 strbuf_addstr(&cmd, prog);
1265 strbuf_addch(&cmd, ' ');
1266 sq_quote_buf(&cmd, path);
1267
1268 /* remove repo-local variables from the environment */
1269 for (var = local_repo_env; *var; var++)
1270 argv_array_push(&conn->env_array, *var);
1271
1272 conn->use_shell = 1;
1273 conn->in = conn->out = -1;
1274 if (protocol == PROTO_SSH) {
1275 char *ssh_host = hostandport;
1276 const char *port = NULL;
1277 transport_check_allowed("ssh");
1278 get_host_and_port(&ssh_host, &port);
1279
1280 if (!port)
1281 port = get_port(ssh_host);
1282
1283 if (flags & CONNECT_DIAG_URL) {
1284 printf("Diag: url=%s\n", url ? url : "NULL");
1285 printf("Diag: protocol=%s\n", prot_name(protocol));
1286 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1287 printf("Diag: port=%s\n", port ? port : "NONE");
1288 printf("Diag: path=%s\n", path ? path : "NULL");
1289
1290 free(hostandport);
1291 free(path);
1292 free(conn);
1293 strbuf_release(&cmd);
1294 return NULL;
1295 }
1296 fill_ssh_args(conn, ssh_host, port, version, flags);
1297 } else {
1298 transport_check_allowed("file");
1299 if (version > 0) {
1300 argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1301 version);
1302 }
1303 }
1304 argv_array_push(&conn->args, cmd.buf);
1305
1306 if (start_command(conn))
1307 die(_("unable to fork"));
1308
1309 fd[0] = conn->out; /* read from child's stdout */
1310 fd[1] = conn->in; /* write to child's stdin */
1311 strbuf_release(&cmd);
1312 }
1313 free(hostandport);
1314 free(path);
1315 return conn;
1316 }
1317
1318 int finish_connect(struct child_process *conn)
1319 {
1320 int code;
1321 if (!conn || git_connection_is_socket(conn))
1322 return 0;
1323
1324 code = finish_command(conn);
1325 free(conn);
1326 return code;
1327 }