50b503da0db608f2154dfdb5ff639643c2eebbc1
[git/git.git] / connect.c
1 #include "git-compat-util.h"
2 #include "cache.h"
3 #include "pkt-line.h"
4 #include "quote.h"
5 #include "refs.h"
6 #include "run-command.h"
7 #include "remote.h"
8 #include "connect.h"
9 #include "url.h"
10 #include "string-list.h"
11 #include "sha1-array.h"
12 #include "transport.h"
13
14 static char *server_capabilities;
15 static const char *parse_feature_value(const char *, const char *, int *);
16
17 static int check_ref(const char *name, unsigned int flags)
18 {
19 if (!flags)
20 return 1;
21
22 if (!skip_prefix(name, "refs/", &name))
23 return 0;
24
25 /* REF_NORMAL means that we don't want the magic fake tag refs */
26 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
27 return 0;
28
29 /* REF_HEADS means that we want regular branch heads */
30 if ((flags & REF_HEADS) && starts_with(name, "heads/"))
31 return 1;
32
33 /* REF_TAGS means that we want tags */
34 if ((flags & REF_TAGS) && starts_with(name, "tags/"))
35 return 1;
36
37 /* All type bits clear means that we are ok with anything */
38 return !(flags & ~REF_NORMAL);
39 }
40
41 int check_ref_type(const struct ref *ref, int flags)
42 {
43 return check_ref(ref->name, flags);
44 }
45
46 static void die_initial_contact(int unexpected)
47 {
48 if (unexpected)
49 die(_("The remote end hung up upon initial contact"));
50 else
51 die(_("Could not read from remote repository.\n\n"
52 "Please make sure you have the correct access rights\n"
53 "and the repository exists."));
54 }
55
56 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
57 {
58 char *sym, *target;
59 struct string_list_item *item;
60
61 if (!len)
62 return; /* just "symref" */
63 /* e.g. "symref=HEAD:refs/heads/master" */
64 sym = xmemdupz(val, len);
65 target = strchr(sym, ':');
66 if (!target)
67 /* just "symref=something" */
68 goto reject;
69 *(target++) = '\0';
70 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
71 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
72 /* "symref=bogus:pair */
73 goto reject;
74 item = string_list_append(symref, sym);
75 item->util = target;
76 return;
77 reject:
78 free(sym);
79 return;
80 }
81
82 static void annotate_refs_with_symref_info(struct ref *ref)
83 {
84 struct string_list symref = STRING_LIST_INIT_DUP;
85 const char *feature_list = server_capabilities;
86
87 while (feature_list) {
88 int len;
89 const char *val;
90
91 val = parse_feature_value(feature_list, "symref", &len);
92 if (!val)
93 break;
94 parse_one_symref_info(&symref, val, len);
95 feature_list = val + 1;
96 }
97 string_list_sort(&symref);
98
99 for (; ref; ref = ref->next) {
100 struct string_list_item *item;
101 item = string_list_lookup(&symref, ref->name);
102 if (!item)
103 continue;
104 ref->symref = xstrdup((char *)item->util);
105 }
106 string_list_clear(&symref, 0);
107 }
108
109 /*
110 * Read all the refs from the other end
111 */
112 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
113 struct ref **list, unsigned int flags,
114 struct sha1_array *extra_have,
115 struct sha1_array *shallow_points)
116 {
117 struct ref **orig_list = list;
118
119 /*
120 * A hang-up after seeing some response from the other end
121 * means that it is unexpected, as we know the other end is
122 * willing to talk to us. A hang-up before seeing any
123 * response does not necessarily mean an ACL problem, though.
124 */
125 int saw_response;
126 int got_dummy_ref_with_capabilities_declaration = 0;
127
128 *list = NULL;
129 for (saw_response = 0; ; saw_response = 1) {
130 struct ref *ref;
131 struct object_id old_oid;
132 char *name;
133 int len, name_len;
134 char *buffer = packet_buffer;
135 const char *arg;
136
137 len = packet_read(in, &src_buf, &src_len,
138 packet_buffer, sizeof(packet_buffer),
139 PACKET_READ_GENTLE_ON_EOF |
140 PACKET_READ_CHOMP_NEWLINE);
141 if (len < 0)
142 die_initial_contact(saw_response);
143
144 if (!len)
145 break;
146
147 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
148 die("remote error: %s", arg);
149
150 if (len == GIT_SHA1_HEXSZ + strlen("shallow ") &&
151 skip_prefix(buffer, "shallow ", &arg)) {
152 if (get_oid_hex(arg, &old_oid))
153 die("protocol error: expected shallow sha-1, got '%s'", arg);
154 if (!shallow_points)
155 die("repository on the other end cannot be shallow");
156 sha1_array_append(shallow_points, &old_oid);
157 continue;
158 }
159
160 if (len < GIT_SHA1_HEXSZ + 2 || get_oid_hex(buffer, &old_oid) ||
161 buffer[GIT_SHA1_HEXSZ] != ' ')
162 die("protocol error: expected sha/ref, got '%s'", buffer);
163 name = buffer + GIT_SHA1_HEXSZ + 1;
164
165 name_len = strlen(name);
166 if (len != name_len + GIT_SHA1_HEXSZ + 1) {
167 free(server_capabilities);
168 server_capabilities = xstrdup(name + name_len + 1);
169 }
170
171 if (extra_have && !strcmp(name, ".have")) {
172 sha1_array_append(extra_have, &old_oid);
173 continue;
174 }
175
176 if (!strcmp(name, "capabilities^{}")) {
177 if (saw_response)
178 die("protocol error: unexpected capabilities^{}");
179 if (got_dummy_ref_with_capabilities_declaration)
180 die("protocol error: multiple capabilities^{}");
181 got_dummy_ref_with_capabilities_declaration = 1;
182 continue;
183 }
184
185 if (!check_ref(name, flags))
186 continue;
187
188 if (got_dummy_ref_with_capabilities_declaration)
189 die("protocol error: unexpected ref after capabilities^{}");
190
191 ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
192 oidcpy(&ref->old_oid, &old_oid);
193 *list = ref;
194 list = &ref->next;
195 }
196
197 annotate_refs_with_symref_info(*orig_list);
198
199 return list;
200 }
201
202 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
203 {
204 int len;
205
206 if (!feature_list)
207 return NULL;
208
209 len = strlen(feature);
210 while (*feature_list) {
211 const char *found = strstr(feature_list, feature);
212 if (!found)
213 return NULL;
214 if (feature_list == found || isspace(found[-1])) {
215 const char *value = found + len;
216 /* feature with no value (e.g., "thin-pack") */
217 if (!*value || isspace(*value)) {
218 if (lenp)
219 *lenp = 0;
220 return value;
221 }
222 /* feature with a value (e.g., "agent=git/1.2.3") */
223 else if (*value == '=') {
224 value++;
225 if (lenp)
226 *lenp = strcspn(value, " \t\n");
227 return value;
228 }
229 /*
230 * otherwise we matched a substring of another feature;
231 * keep looking
232 */
233 }
234 feature_list = found + 1;
235 }
236 return NULL;
237 }
238
239 int parse_feature_request(const char *feature_list, const char *feature)
240 {
241 return !!parse_feature_value(feature_list, feature, NULL);
242 }
243
244 const char *server_feature_value(const char *feature, int *len)
245 {
246 return parse_feature_value(server_capabilities, feature, len);
247 }
248
249 int server_supports(const char *feature)
250 {
251 return !!server_feature_value(feature, NULL);
252 }
253
254 enum protocol {
255 PROTO_LOCAL = 1,
256 PROTO_FILE,
257 PROTO_SSH,
258 PROTO_GIT
259 };
260
261 int url_is_local_not_ssh(const char *url)
262 {
263 const char *colon = strchr(url, ':');
264 const char *slash = strchr(url, '/');
265 return !colon || (slash && slash < colon) ||
266 has_dos_drive_prefix(url);
267 }
268
269 static const char *prot_name(enum protocol protocol)
270 {
271 switch (protocol) {
272 case PROTO_LOCAL:
273 case PROTO_FILE:
274 return "file";
275 case PROTO_SSH:
276 return "ssh";
277 case PROTO_GIT:
278 return "git";
279 default:
280 return "unknown protocol";
281 }
282 }
283
284 static enum protocol get_protocol(const char *name)
285 {
286 if (!strcmp(name, "ssh"))
287 return PROTO_SSH;
288 if (!strcmp(name, "git"))
289 return PROTO_GIT;
290 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
291 return PROTO_SSH;
292 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
293 return PROTO_SSH;
294 if (!strcmp(name, "file"))
295 return PROTO_FILE;
296 die("I don't handle protocol '%s'", name);
297 }
298
299 static char *host_end(char **hoststart, int removebrackets)
300 {
301 char *host = *hoststart;
302 char *end;
303 char *start = strstr(host, "@[");
304 if (start)
305 start++; /* Jump over '@' */
306 else
307 start = host;
308 if (start[0] == '[') {
309 end = strchr(start + 1, ']');
310 if (end) {
311 if (removebrackets) {
312 *end = 0;
313 memmove(start, start + 1, end - start);
314 end++;
315 }
316 } else
317 end = host;
318 } else
319 end = host;
320 return end;
321 }
322
323 #define STR_(s) # s
324 #define STR(s) STR_(s)
325
326 static void get_host_and_port(char **host, const char **port)
327 {
328 char *colon, *end;
329 end = host_end(host, 1);
330 colon = strchr(end, ':');
331 if (colon) {
332 long portnr = strtol(colon + 1, &end, 10);
333 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
334 *colon = 0;
335 *port = colon + 1;
336 } else if (!colon[1]) {
337 *colon = 0;
338 }
339 }
340 }
341
342 static void enable_keepalive(int sockfd)
343 {
344 int ka = 1;
345
346 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
347 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
348 strerror(errno));
349 }
350
351 #ifndef NO_IPV6
352
353 static const char *ai_name(const struct addrinfo *ai)
354 {
355 static char addr[NI_MAXHOST];
356 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
357 NI_NUMERICHOST) != 0)
358 xsnprintf(addr, sizeof(addr), "(unknown)");
359
360 return addr;
361 }
362
363 /*
364 * Returns a connected socket() fd, or else die()s.
365 */
366 static int git_tcp_connect_sock(char *host, int flags)
367 {
368 struct strbuf error_message = STRBUF_INIT;
369 int sockfd = -1;
370 const char *port = STR(DEFAULT_GIT_PORT);
371 struct addrinfo hints, *ai0, *ai;
372 int gai;
373 int cnt = 0;
374
375 get_host_and_port(&host, &port);
376 if (!*port)
377 port = "<none>";
378
379 memset(&hints, 0, sizeof(hints));
380 if (flags & CONNECT_IPV4)
381 hints.ai_family = AF_INET;
382 else if (flags & CONNECT_IPV6)
383 hints.ai_family = AF_INET6;
384 hints.ai_socktype = SOCK_STREAM;
385 hints.ai_protocol = IPPROTO_TCP;
386
387 if (flags & CONNECT_VERBOSE)
388 fprintf(stderr, "Looking up %s ... ", host);
389
390 gai = getaddrinfo(host, port, &hints, &ai);
391 if (gai)
392 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
393
394 if (flags & CONNECT_VERBOSE)
395 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
396
397 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
398 sockfd = socket(ai->ai_family,
399 ai->ai_socktype, ai->ai_protocol);
400 if ((sockfd < 0) ||
401 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
402 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
403 host, cnt, ai_name(ai), strerror(errno));
404 if (0 <= sockfd)
405 close(sockfd);
406 sockfd = -1;
407 continue;
408 }
409 if (flags & CONNECT_VERBOSE)
410 fprintf(stderr, "%s ", ai_name(ai));
411 break;
412 }
413
414 freeaddrinfo(ai0);
415
416 if (sockfd < 0)
417 die("unable to connect to %s:\n%s", host, error_message.buf);
418
419 enable_keepalive(sockfd);
420
421 if (flags & CONNECT_VERBOSE)
422 fprintf(stderr, "done.\n");
423
424 strbuf_release(&error_message);
425
426 return sockfd;
427 }
428
429 #else /* NO_IPV6 */
430
431 /*
432 * Returns a connected socket() fd, or else die()s.
433 */
434 static int git_tcp_connect_sock(char *host, int flags)
435 {
436 struct strbuf error_message = STRBUF_INIT;
437 int sockfd = -1;
438 const char *port = STR(DEFAULT_GIT_PORT);
439 char *ep;
440 struct hostent *he;
441 struct sockaddr_in sa;
442 char **ap;
443 unsigned int nport;
444 int cnt;
445
446 get_host_and_port(&host, &port);
447
448 if (flags & CONNECT_VERBOSE)
449 fprintf(stderr, "Looking up %s ... ", host);
450
451 he = gethostbyname(host);
452 if (!he)
453 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
454 nport = strtoul(port, &ep, 10);
455 if ( ep == port || *ep ) {
456 /* Not numeric */
457 struct servent *se = getservbyname(port,"tcp");
458 if ( !se )
459 die("Unknown port %s", port);
460 nport = se->s_port;
461 }
462
463 if (flags & CONNECT_VERBOSE)
464 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
465
466 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
467 memset(&sa, 0, sizeof sa);
468 sa.sin_family = he->h_addrtype;
469 sa.sin_port = htons(nport);
470 memcpy(&sa.sin_addr, *ap, he->h_length);
471
472 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
473 if ((sockfd < 0) ||
474 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
475 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
476 host,
477 cnt,
478 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
479 strerror(errno));
480 if (0 <= sockfd)
481 close(sockfd);
482 sockfd = -1;
483 continue;
484 }
485 if (flags & CONNECT_VERBOSE)
486 fprintf(stderr, "%s ",
487 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
488 break;
489 }
490
491 if (sockfd < 0)
492 die("unable to connect to %s:\n%s", host, error_message.buf);
493
494 enable_keepalive(sockfd);
495
496 if (flags & CONNECT_VERBOSE)
497 fprintf(stderr, "done.\n");
498
499 return sockfd;
500 }
501
502 #endif /* NO_IPV6 */
503
504
505 static void git_tcp_connect(int fd[2], char *host, int flags)
506 {
507 int sockfd = git_tcp_connect_sock(host, flags);
508
509 fd[0] = sockfd;
510 fd[1] = dup(sockfd);
511 }
512
513
514 static char *git_proxy_command;
515
516 static int git_proxy_command_options(const char *var, const char *value,
517 void *cb)
518 {
519 if (!strcmp(var, "core.gitproxy")) {
520 const char *for_pos;
521 int matchlen = -1;
522 int hostlen;
523 const char *rhost_name = cb;
524 int rhost_len = strlen(rhost_name);
525
526 if (git_proxy_command)
527 return 0;
528 if (!value)
529 return config_error_nonbool(var);
530 /* [core]
531 * ;# matches www.kernel.org as well
532 * gitproxy = netcatter-1 for kernel.org
533 * gitproxy = netcatter-2 for sample.xz
534 * gitproxy = netcatter-default
535 */
536 for_pos = strstr(value, " for ");
537 if (!for_pos)
538 /* matches everybody */
539 matchlen = strlen(value);
540 else {
541 hostlen = strlen(for_pos + 5);
542 if (rhost_len < hostlen)
543 matchlen = -1;
544 else if (!strncmp(for_pos + 5,
545 rhost_name + rhost_len - hostlen,
546 hostlen) &&
547 ((rhost_len == hostlen) ||
548 rhost_name[rhost_len - hostlen -1] == '.'))
549 matchlen = for_pos - value;
550 else
551 matchlen = -1;
552 }
553 if (0 <= matchlen) {
554 /* core.gitproxy = none for kernel.org */
555 if (matchlen == 4 &&
556 !memcmp(value, "none", 4))
557 matchlen = 0;
558 git_proxy_command = xmemdupz(value, matchlen);
559 }
560 return 0;
561 }
562
563 return git_default_config(var, value, cb);
564 }
565
566 static int git_use_proxy(const char *host)
567 {
568 git_proxy_command = getenv("GIT_PROXY_COMMAND");
569 git_config(git_proxy_command_options, (void*)host);
570 return (git_proxy_command && *git_proxy_command);
571 }
572
573 static struct child_process *git_proxy_connect(int fd[2], char *host)
574 {
575 const char *port = STR(DEFAULT_GIT_PORT);
576 struct child_process *proxy;
577
578 get_host_and_port(&host, &port);
579
580 proxy = xmalloc(sizeof(*proxy));
581 child_process_init(proxy);
582 argv_array_push(&proxy->args, git_proxy_command);
583 argv_array_push(&proxy->args, host);
584 argv_array_push(&proxy->args, port);
585 proxy->in = -1;
586 proxy->out = -1;
587 if (start_command(proxy))
588 die("cannot start proxy %s", git_proxy_command);
589 fd[0] = proxy->out; /* read from proxy stdout */
590 fd[1] = proxy->in; /* write to proxy stdin */
591 return proxy;
592 }
593
594 static char *get_port(char *host)
595 {
596 char *end;
597 char *p = strchr(host, ':');
598
599 if (p) {
600 long port = strtol(p + 1, &end, 10);
601 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
602 *p = '\0';
603 return p+1;
604 }
605 }
606
607 return NULL;
608 }
609
610 /*
611 * Extract protocol and relevant parts from the specified connection URL.
612 * The caller must free() the returned strings.
613 */
614 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
615 char **ret_path)
616 {
617 char *url;
618 char *host, *path;
619 char *end;
620 int separator = '/';
621 enum protocol protocol = PROTO_LOCAL;
622
623 if (is_url(url_orig))
624 url = url_decode(url_orig);
625 else
626 url = xstrdup(url_orig);
627
628 host = strstr(url, "://");
629 if (host) {
630 *host = '\0';
631 protocol = get_protocol(url);
632 host += 3;
633 } else {
634 host = url;
635 if (!url_is_local_not_ssh(url)) {
636 protocol = PROTO_SSH;
637 separator = ':';
638 }
639 }
640
641 /*
642 * Don't do destructive transforms as protocol code does
643 * '[]' unwrapping in get_host_and_port()
644 */
645 end = host_end(&host, 0);
646
647 if (protocol == PROTO_LOCAL)
648 path = end;
649 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
650 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
651 else
652 path = strchr(end, separator);
653
654 if (!path || !*path)
655 die("No path specified. See 'man git-pull' for valid url syntax");
656
657 /*
658 * null-terminate hostname and point path to ~ for URL's like this:
659 * ssh://host.xz/~user/repo
660 */
661
662 end = path; /* Need to \0 terminate host here */
663 if (separator == ':')
664 path++; /* path starts after ':' */
665 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
666 if (path[1] == '~')
667 path++;
668 }
669
670 path = xstrdup(path);
671 *end = '\0';
672
673 *ret_host = xstrdup(host);
674 *ret_path = path;
675 free(url);
676 return protocol;
677 }
678
679 static struct child_process no_fork = CHILD_PROCESS_INIT;
680
681 static const char *get_ssh_command(void)
682 {
683 const char *ssh;
684
685 if ((ssh = getenv("GIT_SSH_COMMAND")))
686 return ssh;
687
688 if (!git_config_get_string_const("core.sshcommand", &ssh))
689 return ssh;
690
691 return NULL;
692 }
693
694 static int override_ssh_variant(int *port_option, int *needs_batch)
695 {
696 char *variant;
697
698 variant = xstrdup_or_null(getenv("GIT_SSH_VARIANT"));
699 if (!variant &&
700 git_config_get_string("ssh.variant", &variant))
701 return 0;
702
703 if (!strcmp(variant, "plink") || !strcmp(variant, "putty")) {
704 *port_option = 'P';
705 *needs_batch = 0;
706 } else if (!strcmp(variant, "tortoiseplink")) {
707 *port_option = 'P';
708 *needs_batch = 1;
709 } else {
710 *port_option = 'p';
711 *needs_batch = 0;
712 }
713 free(variant);
714 return 1;
715 }
716
717 static void handle_ssh_variant(const char *ssh_command, int is_cmdline,
718 int *port_option, int *needs_batch)
719 {
720 const char *variant;
721 char *p = NULL;
722
723 if (override_ssh_variant(port_option, needs_batch))
724 return;
725
726 if (!is_cmdline) {
727 p = xstrdup(ssh_command);
728 variant = basename(p);
729 } else {
730 const char **ssh_argv;
731
732 p = xstrdup(ssh_command);
733 if (split_cmdline(p, &ssh_argv)) {
734 variant = basename((char *)ssh_argv[0]);
735 /*
736 * At this point, variant points into the buffer
737 * referenced by p, hence we do not need ssh_argv
738 * any longer.
739 */
740 free(ssh_argv);
741 } else
742 return;
743 }
744
745 if (!strcasecmp(variant, "plink") ||
746 !strcasecmp(variant, "plink.exe"))
747 *port_option = 'P';
748 else if (!strcasecmp(variant, "tortoiseplink") ||
749 !strcasecmp(variant, "tortoiseplink.exe")) {
750 *port_option = 'P';
751 *needs_batch = 1;
752 }
753 free(p);
754 }
755
756 /*
757 * This returns a dummy child_process if the transport protocol does not
758 * need fork(2), or a struct child_process object if it does. Once done,
759 * finish the connection with finish_connect() with the value returned from
760 * this function (it is safe to call finish_connect() with NULL to support
761 * the former case).
762 *
763 * If it returns, the connect is successful; it just dies on errors (this
764 * will hopefully be changed in a libification effort, to return NULL when
765 * the connection failed).
766 */
767 struct child_process *git_connect(int fd[2], const char *url,
768 const char *prog, int flags)
769 {
770 char *hostandport, *path;
771 struct child_process *conn = &no_fork;
772 enum protocol protocol;
773 struct strbuf cmd = STRBUF_INIT;
774
775 /* Without this we cannot rely on waitpid() to tell
776 * what happened to our children.
777 */
778 signal(SIGCHLD, SIG_DFL);
779
780 protocol = parse_connect_url(url, &hostandport, &path);
781 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
782 printf("Diag: url=%s\n", url ? url : "NULL");
783 printf("Diag: protocol=%s\n", prot_name(protocol));
784 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
785 printf("Diag: path=%s\n", path ? path : "NULL");
786 conn = NULL;
787 } else if (protocol == PROTO_GIT) {
788 /*
789 * Set up virtual host information based on where we will
790 * connect, unless the user has overridden us in
791 * the environment.
792 */
793 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
794 if (target_host)
795 target_host = xstrdup(target_host);
796 else
797 target_host = xstrdup(hostandport);
798
799 transport_check_allowed("git");
800
801 /* These underlying connection commands die() if they
802 * cannot connect.
803 */
804 if (git_use_proxy(hostandport))
805 conn = git_proxy_connect(fd, hostandport);
806 else
807 git_tcp_connect(fd, hostandport, flags);
808 /*
809 * Separate original protocol components prog and path
810 * from extended host header with a NUL byte.
811 *
812 * Note: Do not add any other headers here! Doing so
813 * will cause older git-daemon servers to crash.
814 */
815 packet_write_fmt(fd[1],
816 "%s %s%chost=%s%c",
817 prog, path, 0,
818 target_host, 0);
819 free(target_host);
820 } else {
821 conn = xmalloc(sizeof(*conn));
822 child_process_init(conn);
823
824 strbuf_addstr(&cmd, prog);
825 strbuf_addch(&cmd, ' ');
826 sq_quote_buf(&cmd, path);
827
828 /* remove repo-local variables from the environment */
829 conn->env = local_repo_env;
830 conn->use_shell = 1;
831 conn->in = conn->out = -1;
832 if (protocol == PROTO_SSH) {
833 const char *ssh;
834 int needs_batch = 0;
835 int port_option = 'p';
836 char *ssh_host = hostandport;
837 const char *port = NULL;
838 transport_check_allowed("ssh");
839 get_host_and_port(&ssh_host, &port);
840
841 if (!port)
842 port = get_port(ssh_host);
843
844 if (flags & CONNECT_DIAG_URL) {
845 printf("Diag: url=%s\n", url ? url : "NULL");
846 printf("Diag: protocol=%s\n", prot_name(protocol));
847 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
848 printf("Diag: port=%s\n", port ? port : "NONE");
849 printf("Diag: path=%s\n", path ? path : "NULL");
850
851 free(hostandport);
852 free(path);
853 free(conn);
854 return NULL;
855 }
856
857 ssh = get_ssh_command();
858 if (ssh)
859 handle_ssh_variant(ssh, 1, &port_option,
860 &needs_batch);
861 else {
862 /*
863 * GIT_SSH is the no-shell version of
864 * GIT_SSH_COMMAND (and must remain so for
865 * historical compatibility).
866 */
867 conn->use_shell = 0;
868
869 ssh = getenv("GIT_SSH");
870 if (!ssh)
871 ssh = "ssh";
872 else
873 handle_ssh_variant(ssh, 0,
874 &port_option,
875 &needs_batch);
876 }
877
878 argv_array_push(&conn->args, ssh);
879 if (flags & CONNECT_IPV4)
880 argv_array_push(&conn->args, "-4");
881 else if (flags & CONNECT_IPV6)
882 argv_array_push(&conn->args, "-6");
883 if (needs_batch)
884 argv_array_push(&conn->args, "-batch");
885 if (port) {
886 argv_array_pushf(&conn->args,
887 "-%c", port_option);
888 argv_array_push(&conn->args, port);
889 }
890 argv_array_push(&conn->args, ssh_host);
891 } else {
892 transport_check_allowed("file");
893 }
894 argv_array_push(&conn->args, cmd.buf);
895
896 if (start_command(conn))
897 die("unable to fork");
898
899 fd[0] = conn->out; /* read from child's stdout */
900 fd[1] = conn->in; /* write to child's stdin */
901 strbuf_release(&cmd);
902 }
903 free(hostandport);
904 free(path);
905 return conn;
906 }
907
908 int git_connection_is_socket(struct child_process *conn)
909 {
910 return conn == &no_fork;
911 }
912
913 int finish_connect(struct child_process *conn)
914 {
915 int code;
916 if (!conn || git_connection_is_socket(conn))
917 return 0;
918
919 code = finish_command(conn);
920 free(conn);
921 return code;
922 }