Sync with 2.14.2
[git/git.git] / connect.c
CommitLineData
731043fd 1#include "git-compat-util.h"
f7192598 2#include "cache.h"
b2141fc1 3#include "config.h"
41cb7488 4#include "pkt-line.h"
b10d0ec7 5#include "quote.h"
6abf5c0c 6#include "refs.h"
15a1c012 7#include "run-command.h"
6b62816c 8#include "remote.h"
47a59185 9#include "connect.h"
9d2e9420 10#include "url.h"
a45b5f05 11#include "string-list.h"
13eb4626 12#include "sha1-array.h"
a5adaced 13#include "transport.h"
f7192598 14
96f1e58f 15static char *server_capabilities;
5d54cffc 16static const char *parse_feature_value(const char *, const char *, int *);
211b5f9e 17
be0b3f82 18static int check_ref(const char *name, unsigned int flags)
2718ff09
LT
19{
20 if (!flags)
21 return 1;
22
be0b3f82 23 if (!skip_prefix(name, "refs/", &name))
2718ff09
LT
24 return 0;
25
2718ff09 26 /* REF_NORMAL means that we don't want the magic fake tag refs */
8d9c5010 27 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
2718ff09
LT
28 return 0;
29
30 /* REF_HEADS means that we want regular branch heads */
be0b3f82 31 if ((flags & REF_HEADS) && starts_with(name, "heads/"))
2718ff09
LT
32 return 1;
33
34 /* REF_TAGS means that we want tags */
be0b3f82 35 if ((flags & REF_TAGS) && starts_with(name, "tags/"))
2718ff09
LT
36 return 1;
37
38 /* All type bits clear means that we are ok with anything */
39 return !(flags & ~REF_NORMAL);
40}
41
4577370e
DB
42int check_ref_type(const struct ref *ref, int flags)
43{
be0b3f82 44 return check_ref(ref->name, flags);
4577370e
DB
45}
46
55e4f936 47static void die_initial_contact(int unexpected)
46284dd1 48{
55e4f936 49 if (unexpected)
f2b93b38 50 die(_("The remote end hung up upon initial contact"));
46284dd1 51 else
f2b93b38
VA
52 die(_("Could not read from remote repository.\n\n"
53 "Please make sure you have the correct access rights\n"
54 "and the repository exists."));
46284dd1
HV
55}
56
a45b5f05
JH
57static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
58{
59 char *sym, *target;
60 struct string_list_item *item;
61
62 if (!len)
63 return; /* just "symref" */
64 /* e.g. "symref=HEAD:refs/heads/master" */
5c0b13f8 65 sym = xmemdupz(val, len);
a45b5f05
JH
66 target = strchr(sym, ':');
67 if (!target)
68 /* just "symref=something" */
69 goto reject;
70 *(target++) = '\0';
71 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
72 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
73 /* "symref=bogus:pair */
74 goto reject;
ef4fe561 75 item = string_list_append_nodup(symref, sym);
a45b5f05
JH
76 item->util = target;
77 return;
78reject:
79 free(sym);
80 return;
81}
82
83static void annotate_refs_with_symref_info(struct ref *ref)
84{
85 struct string_list symref = STRING_LIST_INIT_DUP;
86 const char *feature_list = server_capabilities;
87
88 while (feature_list) {
89 int len;
90 const char *val;
91
92 val = parse_feature_value(feature_list, "symref", &len);
93 if (!val)
94 break;
95 parse_one_symref_info(&symref, val, len);
96 feature_list = val + 1;
97 }
3383e199 98 string_list_sort(&symref);
a45b5f05
JH
99
100 for (; ref; ref = ref->next) {
101 struct string_list_item *item;
102 item = string_list_lookup(&symref, ref->name);
103 if (!item)
104 continue;
105 ref->symref = xstrdup((char *)item->util);
106 }
107 string_list_clear(&symref, 0);
108}
109
d1c133f5
LT
110/*
111 * Read all the refs from the other end
112 */
85edf4f5
JK
113struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
114 struct ref **list, unsigned int flags,
910650d2 115 struct oid_array *extra_have,
116 struct oid_array *shallow_points)
d1c133f5 117{
a45b5f05 118 struct ref **orig_list = list;
55e4f936
JN
119
120 /*
121 * A hang-up after seeing some response from the other end
122 * means that it is unexpected, as we know the other end is
123 * willing to talk to us. A hang-up before seeing any
124 * response does not necessarily mean an ACL problem, though.
125 */
126 int saw_response;
eb398797 127 int got_dummy_ref_with_capabilities_declaration = 0;
46284dd1 128
d1c133f5 129 *list = NULL;
55e4f936 130 for (saw_response = 0; ; saw_response = 1) {
d1c133f5 131 struct ref *ref;
e96b16cc 132 struct object_id old_oid;
d1c133f5 133 char *name;
211b5f9e 134 int len, name_len;
74543a04 135 char *buffer = packet_buffer;
ae021d87 136 const char *arg;
d1c133f5 137
85edf4f5 138 len = packet_read(in, &src_buf, &src_len,
4981fe75 139 packet_buffer, sizeof(packet_buffer),
819b929d
JK
140 PACKET_READ_GENTLE_ON_EOF |
141 PACKET_READ_CHOMP_NEWLINE);
46284dd1 142 if (len < 0)
55e4f936 143 die_initial_contact(saw_response);
46284dd1 144
d1c133f5
LT
145 if (!len)
146 break;
d1c133f5 147
ae021d87
JK
148 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
149 die("remote error: %s", arg);
a8073289 150
e96b16cc 151 if (len == GIT_SHA1_HEXSZ + strlen("shallow ") &&
152 skip_prefix(buffer, "shallow ", &arg)) {
153 if (get_oid_hex(arg, &old_oid))
ae021d87 154 die("protocol error: expected shallow sha-1, got '%s'", arg);
b06dcd7d
NTND
155 if (!shallow_points)
156 die("repository on the other end cannot be shallow");
910650d2 157 oid_array_append(shallow_points, &old_oid);
b06dcd7d
NTND
158 continue;
159 }
160
e96b16cc 161 if (len < GIT_SHA1_HEXSZ + 2 || get_oid_hex(buffer, &old_oid) ||
162 buffer[GIT_SHA1_HEXSZ] != ' ')
d1c133f5 163 die("protocol error: expected sha/ref, got '%s'", buffer);
e96b16cc 164 name = buffer + GIT_SHA1_HEXSZ + 1;
1a7141ff 165
211b5f9e 166 name_len = strlen(name);
e96b16cc 167 if (len != name_len + GIT_SHA1_HEXSZ + 1) {
8e0f7003 168 free(server_capabilities);
9befac47 169 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
170 }
171
2ae7f90f 172 if (extra_have && !strcmp(name, ".have")) {
910650d2 173 oid_array_append(extra_have, &old_oid);
40c155ff
JH
174 continue;
175 }
176
eb398797
JT
177 if (!strcmp(name, "capabilities^{}")) {
178 if (saw_response)
179 die("protocol error: unexpected capabilities^{}");
180 if (got_dummy_ref_with_capabilities_declaration)
181 die("protocol error: multiple capabilities^{}");
182 got_dummy_ref_with_capabilities_declaration = 1;
183 continue;
184 }
185
be0b3f82 186 if (!check_ref(name, flags))
cfee10a7 187 continue;
eb398797
JT
188
189 if (got_dummy_ref_with_capabilities_declaration)
190 die("protocol error: unexpected ref after capabilities^{}");
191
e96b16cc 192 ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
193 oidcpy(&ref->old_oid, &old_oid);
d1c133f5
LT
194 *list = ref;
195 list = &ref->next;
196 }
a45b5f05
JH
197
198 annotate_refs_with_symref_info(*orig_list);
199
d1c133f5
LT
200 return list;
201}
202
5d54cffc 203static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
f47182c8
JH
204{
205 int len;
206
207 if (!feature_list)
208 return NULL;
209
210 len = strlen(feature);
211 while (*feature_list) {
212 const char *found = strstr(feature_list, feature);
213 if (!found)
214 return NULL;
94427108
JK
215 if (feature_list == found || isspace(found[-1])) {
216 const char *value = found + len;
217 /* feature with no value (e.g., "thin-pack") */
218 if (!*value || isspace(*value)) {
219 if (lenp)
220 *lenp = 0;
221 return value;
222 }
223 /* feature with a value (e.g., "agent=git/1.2.3") */
224 else if (*value == '=') {
225 value++;
226 if (lenp)
227 *lenp = strcspn(value, " \t\n");
228 return value;
229 }
230 /*
231 * otherwise we matched a substring of another feature;
232 * keep looking
233 */
234 }
f47182c8
JH
235 feature_list = found + 1;
236 }
237 return NULL;
211b5f9e
JS
238}
239
94427108
JK
240int parse_feature_request(const char *feature_list, const char *feature)
241{
242 return !!parse_feature_value(feature_list, feature, NULL);
243}
244
245const char *server_feature_value(const char *feature, int *len)
246{
247 return parse_feature_value(server_capabilities, feature, len);
248}
249
250int server_supports(const char *feature)
251{
252 return !!server_feature_value(feature, NULL);
253}
254
2386d658
LT
255enum protocol {
256 PROTO_LOCAL = 1,
c59ab2e5 257 PROTO_FILE,
2386d658 258 PROTO_SSH,
4b05548f 259 PROTO_GIT
2386d658
LT
260};
261
c59ab2e5
TB
262int url_is_local_not_ssh(const char *url)
263{
264 const char *colon = strchr(url, ':');
265 const char *slash = strchr(url, '/');
266 return !colon || (slash && slash < colon) ||
267 has_dos_drive_prefix(url);
268}
269
5610b7c0
TB
270static const char *prot_name(enum protocol protocol)
271{
272 switch (protocol) {
273 case PROTO_LOCAL:
c59ab2e5 274 case PROTO_FILE:
5610b7c0
TB
275 return "file";
276 case PROTO_SSH:
277 return "ssh";
278 case PROTO_GIT:
279 return "git";
280 default:
83e6bda3 281 return "unknown protocol";
5610b7c0
TB
282 }
283}
284
2386d658
LT
285static enum protocol get_protocol(const char *name)
286{
287 if (!strcmp(name, "ssh"))
288 return PROTO_SSH;
289 if (!strcmp(name, "git"))
290 return PROTO_GIT;
07c7782c 291 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
c05186cc 292 return PROTO_SSH;
07c7782c 293 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
c05186cc 294 return PROTO_SSH;
72a4f4b6 295 if (!strcmp(name, "file"))
c59ab2e5 296 return PROTO_FILE;
2386d658
LT
297 die("I don't handle protocol '%s'", name);
298}
299
86ceb337
TB
300static char *host_end(char **hoststart, int removebrackets)
301{
302 char *host = *hoststart;
303 char *end;
304 char *start = strstr(host, "@[");
305 if (start)
306 start++; /* Jump over '@' */
307 else
308 start = host;
309 if (start[0] == '[') {
310 end = strchr(start + 1, ']');
311 if (end) {
312 if (removebrackets) {
313 *end = 0;
314 memmove(start, start + 1, end - start);
315 end++;
316 }
317 } else
318 end = host;
319 } else
320 end = host;
321 return end;
322}
323
5ba88448
YH
324#define STR_(s) # s
325#define STR(s) STR_(s)
2386d658 326
72a534da
ML
327static void get_host_and_port(char **host, const char **port)
328{
329 char *colon, *end;
86ceb337 330 end = host_end(host, 1);
72a534da 331 colon = strchr(end, ':');
72a534da 332 if (colon) {
86ceb337
TB
333 long portnr = strtol(colon + 1, &end, 10);
334 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
335 *colon = 0;
336 *port = colon + 1;
6b6c5f7a
TB
337 } else if (!colon[1]) {
338 *colon = 0;
86ceb337 339 }
72a534da
ML
340 }
341}
342
e47a8583
EW
343static void enable_keepalive(int sockfd)
344{
345 int ka = 1;
346
347 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
348 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
349 strerror(errno));
350}
351
49744d63 352#ifndef NO_IPV6
4c505f71 353
ba505322
AR
354static const char *ai_name(const struct addrinfo *ai)
355{
785a9857
BK
356 static char addr[NI_MAXHOST];
357 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
358 NI_NUMERICHOST) != 0)
5096d490 359 xsnprintf(addr, sizeof(addr), "(unknown)");
785a9857 360
ba505322
AR
361 return addr;
362}
363
5ad312be
JL
364/*
365 * Returns a connected socket() fd, or else die()s.
366 */
7841ce79 367static int git_tcp_connect_sock(char *host, int flags)
2386d658 368{
63a995b6
DZ
369 struct strbuf error_message = STRBUF_INIT;
370 int sockfd = -1;
554fe20d 371 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
372 struct addrinfo hints, *ai0, *ai;
373 int gai;
ba505322 374 int cnt = 0;
5ba88448 375
72a534da
ML
376 get_host_and_port(&host, &port);
377 if (!*port)
378 port = "<none>";
5ba88448
YH
379
380 memset(&hints, 0, sizeof(hints));
c915f11e
EW
381 if (flags & CONNECT_IPV4)
382 hints.ai_family = AF_INET;
383 else if (flags & CONNECT_IPV6)
384 hints.ai_family = AF_INET6;
5ba88448
YH
385 hints.ai_socktype = SOCK_STREAM;
386 hints.ai_protocol = IPPROTO_TCP;
387
7841ce79
MT
388 if (flags & CONNECT_VERBOSE)
389 fprintf(stderr, "Looking up %s ... ", host);
390
5ba88448
YH
391 gai = getaddrinfo(host, port, &hints, &ai);
392 if (gai)
608d48b2 393 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 394
7841ce79
MT
395 if (flags & CONNECT_VERBOSE)
396 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
397
e08afecd 398 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
399 sockfd = socket(ai->ai_family,
400 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
401 if ((sockfd < 0) ||
402 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
403 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
404 host, cnt, ai_name(ai), strerror(errno));
405 if (0 <= sockfd)
406 close(sockfd);
5ba88448
YH
407 sockfd = -1;
408 continue;
2386d658 409 }
ba505322
AR
410 if (flags & CONNECT_VERBOSE)
411 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 412 break;
2386d658
LT
413 }
414
5ba88448 415 freeaddrinfo(ai0);
2386d658 416
2386d658 417 if (sockfd < 0)
63a995b6 418 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 419
e47a8583
EW
420 enable_keepalive(sockfd);
421
7841ce79
MT
422 if (flags & CONNECT_VERBOSE)
423 fprintf(stderr, "done.\n");
424
63a995b6
DZ
425 strbuf_release(&error_message);
426
5ad312be 427 return sockfd;
2386d658
LT
428}
429
49744d63 430#else /* NO_IPV6 */
4c505f71 431
5ad312be
JL
432/*
433 * Returns a connected socket() fd, or else die()s.
434 */
7841ce79 435static int git_tcp_connect_sock(char *host, int flags)
4c505f71 436{
7203a2d1
EFL
437 struct strbuf error_message = STRBUF_INIT;
438 int sockfd = -1;
72a534da
ML
439 const char *port = STR(DEFAULT_GIT_PORT);
440 char *ep;
4c505f71
PA
441 struct hostent *he;
442 struct sockaddr_in sa;
443 char **ap;
444 unsigned int nport;
ba505322 445 int cnt;
4c505f71 446
72a534da 447 get_host_and_port(&host, &port);
4c505f71 448
7841ce79
MT
449 if (flags & CONNECT_VERBOSE)
450 fprintf(stderr, "Looking up %s ... ", host);
451
4c505f71
PA
452 he = gethostbyname(host);
453 if (!he)
454 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
455 nport = strtoul(port, &ep, 10);
456 if ( ep == port || *ep ) {
457 /* Not numeric */
458 struct servent *se = getservbyname(port,"tcp");
459 if ( !se )
d7530708 460 die("Unknown port %s", port);
4c505f71
PA
461 nport = se->s_port;
462 }
463
7841ce79
MT
464 if (flags & CONNECT_VERBOSE)
465 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
466
ba505322 467 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
468 memset(&sa, 0, sizeof sa);
469 sa.sin_family = he->h_addrtype;
6573faff 470 sa.sin_port = htons(nport);
c6164218 471 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 472
7203a2d1
EFL
473 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
474 if ((sockfd < 0) ||
475 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
476 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
ba505322
AR
477 host,
478 cnt,
479 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
480 strerror(errno));
481 if (0 <= sockfd)
482 close(sockfd);
4c505f71
PA
483 sockfd = -1;
484 continue;
485 }
ba505322
AR
486 if (flags & CONNECT_VERBOSE)
487 fprintf(stderr, "%s ",
488 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
489 break;
490 }
491
492 if (sockfd < 0)
7203a2d1 493 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 494
e47a8583
EW
495 enable_keepalive(sockfd);
496
7841ce79
MT
497 if (flags & CONNECT_VERBOSE)
498 fprintf(stderr, "done.\n");
499
5ad312be
JL
500 return sockfd;
501}
502
503#endif /* NO_IPV6 */
504
505
7841ce79 506static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 507{
7841ce79 508 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 509
4c505f71 510 fd[0] = sockfd;
ec587fde 511 fd[1] = dup(sockfd);
4c505f71
PA
512}
513
4c505f71 514
96f1e58f 515static char *git_proxy_command;
f8014776 516
ef90d6d4
JS
517static int git_proxy_command_options(const char *var, const char *value,
518 void *cb)
f8014776 519{
e814bc4d 520 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
521 const char *for_pos;
522 int matchlen = -1;
523 int hostlen;
15112c95
EFL
524 const char *rhost_name = cb;
525 int rhost_len = strlen(rhost_name);
c3df8568 526
e814bc4d 527 if (git_proxy_command)
f8014776 528 return 0;
c64b9ad0
JH
529 if (!value)
530 return config_error_nonbool(var);
e814bc4d
JH
531 /* [core]
532 * ;# matches www.kernel.org as well
533 * gitproxy = netcatter-1 for kernel.org
534 * gitproxy = netcatter-2 for sample.xz
535 * gitproxy = netcatter-default
536 */
c3df8568 537 for_pos = strstr(value, " for ");
e814bc4d
JH
538 if (!for_pos)
539 /* matches everybody */
540 matchlen = strlen(value);
541 else {
542 hostlen = strlen(for_pos + 5);
543 if (rhost_len < hostlen)
544 matchlen = -1;
545 else if (!strncmp(for_pos + 5,
546 rhost_name + rhost_len - hostlen,
547 hostlen) &&
548 ((rhost_len == hostlen) ||
549 rhost_name[rhost_len - hostlen -1] == '.'))
550 matchlen = for_pos - value;
551 else
552 matchlen = -1;
553 }
554 if (0 <= matchlen) {
555 /* core.gitproxy = none for kernel.org */
a6080a0a 556 if (matchlen == 4 &&
e814bc4d
JH
557 !memcmp(value, "none", 4))
558 matchlen = 0;
182af834 559 git_proxy_command = xmemdupz(value, matchlen);
f8014776 560 }
e814bc4d 561 return 0;
f8014776
PC
562 }
563
ef90d6d4 564 return git_default_config(var, value, cb);
f8014776
PC
565}
566
e814bc4d 567static int git_use_proxy(const char *host)
f8014776
PC
568{
569 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 570 git_config(git_proxy_command_options, (void*)host);
e814bc4d 571 return (git_proxy_command && *git_proxy_command);
f8014776
PC
572}
573
5cbf8246 574static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 575{
554fe20d 576 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246 577 struct child_process *proxy;
f8014776 578
72a534da 579 get_host_and_port(&host, &port);
f8014776 580
3be4cf09
JK
581 if (looks_like_command_line_option(host))
582 die("strange hostname '%s' blocked", host);
583 if (looks_like_command_line_option(port))
584 die("strange port '%s' blocked", port);
585
483bbd4e
RS
586 proxy = xmalloc(sizeof(*proxy));
587 child_process_init(proxy);
1823bea1
JK
588 argv_array_push(&proxy->args, git_proxy_command);
589 argv_array_push(&proxy->args, host);
590 argv_array_push(&proxy->args, port);
5cbf8246
JK
591 proxy->in = -1;
592 proxy->out = -1;
593 if (start_command(proxy))
1823bea1 594 die("cannot start proxy %s", git_proxy_command);
5cbf8246
JK
595 fd[0] = proxy->out; /* read from proxy stdout */
596 fd[1] = proxy->in; /* write to proxy stdin */
597 return proxy;
f8014776
PC
598}
599
86ceb337 600static char *get_port(char *host)
2e776665
LT
601{
602 char *end;
86ceb337
TB
603 char *p = strchr(host, ':');
604
2e776665 605 if (p) {
8f148253
RS
606 long port = strtol(p + 1, &end, 10);
607 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
86ceb337
TB
608 *p = '\0';
609 return p+1;
2e776665
LT
610 }
611 }
612
613 return NULL;
614}
615
f7192598 616/*
cabc3c12
JS
617 * Extract protocol and relevant parts from the specified connection URL.
618 * The caller must free() the returned strings.
f7192598 619 */
cabc3c12 620static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
83b05875 621 char **ret_path)
f7192598 622{
9d2e9420 623 char *url;
8e76bf3f 624 char *host, *path;
356bece0 625 char *end;
c59ab2e5 626 int separator = '/';
faea9ccb 627 enum protocol protocol = PROTO_LOCAL;
f0b7367c 628
9d2e9420
JK
629 if (is_url(url_orig))
630 url = url_decode(url_orig);
631 else
632 url = xstrdup(url_orig);
633
faea9ccb 634 host = strstr(url, "://");
eeefa7c9 635 if (host) {
faea9ccb
AE
636 *host = '\0';
637 protocol = get_protocol(url);
638 host += 3;
356bece0 639 } else {
f7192598 640 host = url;
c59ab2e5
TB
641 if (!url_is_local_not_ssh(url)) {
642 protocol = PROTO_SSH;
643 separator = ':';
644 }
356bece0
YH
645 }
646
9aa5053d 647 /*
83b05875
TB
648 * Don't do destructive transforms as protocol code does
649 * '[]' unwrapping in get_host_and_port()
9aa5053d 650 */
86ceb337 651 end = host_end(&host, 0);
356bece0 652
c59ab2e5 653 if (protocol == PROTO_LOCAL)
72a4f4b6 654 path = end;
c59ab2e5
TB
655 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
656 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
657 else
658 path = strchr(end, separator);
2386d658 659
faea9ccb
AE
660 if (!path || !*path)
661 die("No path specified. See 'man git-pull' for valid url syntax");
662
663 /*
664 * null-terminate hostname and point path to ~ for URL's like this:
665 * ssh://host.xz/~user/repo
666 */
c59ab2e5
TB
667
668 end = path; /* Need to \0 terminate host here */
669 if (separator == ':')
670 path++; /* path starts after ':' */
671 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
faea9ccb
AE
672 if (path[1] == '~')
673 path++;
faea9ccb
AE
674 }
675
c59ab2e5
TB
676 path = xstrdup(path);
677 *end = '\0';
678
cabc3c12 679 *ret_host = xstrdup(host);
c59ab2e5 680 *ret_path = path;
cabc3c12
JS
681 free(url);
682 return protocol;
683}
684
d3180279 685static struct child_process no_fork = CHILD_PROCESS_INIT;
cabc3c12 686
3c8ede3f
NTND
687static const char *get_ssh_command(void)
688{
689 const char *ssh;
690
691 if ((ssh = getenv("GIT_SSH_COMMAND")))
692 return ssh;
693
694 if (!git_config_get_string_const("core.sshcommand", &ssh))
695 return ssh;
696
697 return NULL;
698}
699
486c8e8c 700static int override_ssh_variant(int *port_option, int *needs_batch)
e2824e47 701{
486c8e8c
JH
702 char *variant;
703
704 variant = xstrdup_or_null(getenv("GIT_SSH_VARIANT"));
705 if (!variant &&
706 git_config_get_string("ssh.variant", &variant))
707 return 0;
708
709 if (!strcmp(variant, "plink") || !strcmp(variant, "putty")) {
710 *port_option = 'P';
711 *needs_batch = 0;
712 } else if (!strcmp(variant, "tortoiseplink")) {
713 *port_option = 'P';
714 *needs_batch = 1;
715 } else {
716 *port_option = 'p';
717 *needs_batch = 0;
718 }
719 free(variant);
720 return 1;
721}
722
723static void handle_ssh_variant(const char *ssh_command, int is_cmdline,
724 int *port_option, int *needs_batch)
725{
726 const char *variant;
e2824e47
JS
727 char *p = NULL;
728
486c8e8c
JH
729 if (override_ssh_variant(port_option, needs_batch))
730 return;
731
732 if (!is_cmdline) {
e2824e47
JS
733 p = xstrdup(ssh_command);
734 variant = basename(p);
735 } else {
736 const char **ssh_argv;
737
738 p = xstrdup(ssh_command);
22e5ae5c 739 if (split_cmdline(p, &ssh_argv) > 0) {
e2824e47
JS
740 variant = basename((char *)ssh_argv[0]);
741 /*
742 * At this point, variant points into the buffer
743 * referenced by p, hence we do not need ssh_argv
744 * any longer.
745 */
746 free(ssh_argv);
5d2993b6
JK
747 } else {
748 free(p);
486c8e8c 749 return;
5d2993b6 750 }
e2824e47
JS
751 }
752
753 if (!strcasecmp(variant, "plink") ||
486c8e8c 754 !strcasecmp(variant, "plink.exe"))
e2824e47
JS
755 *port_option = 'P';
756 else if (!strcasecmp(variant, "tortoiseplink") ||
757 !strcasecmp(variant, "tortoiseplink.exe")) {
758 *port_option = 'P';
759 *needs_batch = 1;
760 }
761 free(p);
e2824e47
JS
762}
763
cabc3c12
JS
764/*
765 * This returns a dummy child_process if the transport protocol does not
766 * need fork(2), or a struct child_process object if it does. Once done,
767 * finish the connection with finish_connect() with the value returned from
768 * this function (it is safe to call finish_connect() with NULL to support
769 * the former case).
770 *
771 * If it returns, the connect is successful; it just dies on errors (this
772 * will hopefully be changed in a libification effort, to return NULL when
773 * the connection failed).
774 */
775struct child_process *git_connect(int fd[2], const char *url,
776 const char *prog, int flags)
777{
a2036d7e 778 char *hostandport, *path;
cabc3c12
JS
779 struct child_process *conn = &no_fork;
780 enum protocol protocol;
cabc3c12
JS
781
782 /* Without this we cannot rely on waitpid() to tell
783 * what happened to our children.
2e776665 784 */
cabc3c12 785 signal(SIGCHLD, SIG_DFL);
2e776665 786
a2036d7e 787 protocol = parse_connect_url(url, &hostandport, &path);
3f55ccab 788 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
5610b7c0
TB
789 printf("Diag: url=%s\n", url ? url : "NULL");
790 printf("Diag: protocol=%s\n", prot_name(protocol));
a2036d7e 791 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
5610b7c0 792 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e
TB
793 conn = NULL;
794 } else if (protocol == PROTO_GIT) {
94bc83c5
JK
795 /*
796 * Set up virtual host information based on where we will
797 * connect, unless the user has overridden us in
798 * the environment.
799 */
800 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
801 if (target_host)
802 target_host = xstrdup(target_host);
803 else
804 target_host = xstrdup(hostandport);
805
a5adaced
JK
806 transport_check_allowed("git");
807
5ad312be
JL
808 /* These underlying connection commands die() if they
809 * cannot connect.
810 */
a2036d7e
TB
811 if (git_use_proxy(hostandport))
812 conn = git_proxy_connect(fd, hostandport);
da2a95b2 813 else
a2036d7e 814 git_tcp_connect(fd, hostandport, flags);
5ad312be
JL
815 /*
816 * Separate original protocol components prog and path
73bb33a9
SP
817 * from extended host header with a NUL byte.
818 *
819 * Note: Do not add any other headers here! Doing so
820 * will cause older git-daemon servers to crash.
5ad312be 821 */
81c634e9 822 packet_write_fmt(fd[1],
5ad312be
JL
823 "%s %s%chost=%s%c",
824 prog, path, 0,
825 target_host, 0);
826 free(target_host);
a2036d7e 827 } else {
f1399291
RS
828 struct strbuf cmd = STRBUF_INIT;
829
483bbd4e
RS
830 conn = xmalloc(sizeof(*conn));
831 child_process_init(conn);
a2036d7e 832
aeeb2d49
JK
833 if (looks_like_command_line_option(path))
834 die("strange pathname '%s' blocked", path);
835
a2036d7e
TB
836 strbuf_addstr(&cmd, prog);
837 strbuf_addch(&cmd, ' ');
838 sq_quote_buf(&cmd, path);
839
aab40438
JK
840 /* remove repo-local variables from the environment */
841 conn->env = local_repo_env;
a48b409f 842 conn->use_shell = 1;
a2036d7e 843 conn->in = conn->out = -1;
a2036d7e 844 if (protocol == PROTO_SSH) {
39942766 845 const char *ssh;
6a4f3a9e
JH
846 int needs_batch = 0;
847 int port_option = 'p';
a2036d7e
TB
848 char *ssh_host = hostandport;
849 const char *port = NULL;
a5adaced 850 transport_check_allowed("ssh");
a2036d7e 851 get_host_and_port(&ssh_host, &port);
a2036d7e 852
86ceb337
TB
853 if (!port)
854 port = get_port(ssh_host);
42da4840 855
3f55ccab
TB
856 if (flags & CONNECT_DIAG_URL) {
857 printf("Diag: url=%s\n", url ? url : "NULL");
858 printf("Diag: protocol=%s\n", prot_name(protocol));
859 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
860 printf("Diag: port=%s\n", port ? port : "NONE");
861 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e 862
3f55ccab
TB
863 free(hostandport);
864 free(path);
04f20c04 865 free(conn);
f1399291 866 strbuf_release(&cmd);
3f55ccab 867 return NULL;
37ee646e 868 }
869
2491f77b 870 if (looks_like_command_line_option(ssh_host))
820d7650
JH
871 die("strange hostname '%s' blocked", ssh_host);
872
3c8ede3f 873 ssh = get_ssh_command();
e2824e47
JS
874 if (ssh)
875 handle_ssh_variant(ssh, 1, &port_option,
876 &needs_batch);
877 else {
a48b409f
JK
878 /*
879 * GIT_SSH is the no-shell version of
880 * GIT_SSH_COMMAND (and must remain so for
881 * historical compatibility).
882 */
883 conn->use_shell = 0;
884
37ee646e 885 ssh = getenv("GIT_SSH");
886 if (!ssh)
887 ssh = "ssh";
e2824e47
JS
888 else
889 handle_ssh_variant(ssh, 0,
890 &port_option,
891 &needs_batch);
37ee646e 892 }
893
894 argv_array_push(&conn->args, ssh);
c915f11e
EW
895 if (flags & CONNECT_IPV4)
896 argv_array_push(&conn->args, "-4");
897 else if (flags & CONNECT_IPV6)
898 argv_array_push(&conn->args, "-6");
6a4f3a9e 899 if (needs_batch)
37ee646e 900 argv_array_push(&conn->args, "-batch");
901 if (port) {
6a4f3a9e
JH
902 argv_array_pushf(&conn->args,
903 "-%c", port_option);
37ee646e 904 argv_array_push(&conn->args, port);
a2036d7e 905 }
37ee646e 906 argv_array_push(&conn->args, ssh_host);
c049b61d 907 } else {
a5adaced 908 transport_check_allowed("file");
4852f723 909 }
1823bea1 910 argv_array_push(&conn->args, cmd.buf);
f364cb88 911
a2036d7e
TB
912 if (start_command(conn))
913 die("unable to fork");
f364cb88 914
a2036d7e
TB
915 fd[0] = conn->out; /* read from child's stdout */
916 fd[1] = conn->in; /* write to child's stdin */
917 strbuf_release(&cmd);
918 }
919 free(hostandport);
cabc3c12 920 free(path);
98158e9c 921 return conn;
f7192598
LT
922}
923
7ffe853b
JK
924int git_connection_is_socket(struct child_process *conn)
925{
926 return conn == &no_fork;
927}
928
98158e9c 929int finish_connect(struct child_process *conn)
f7192598 930{
f364cb88 931 int code;
7ffe853b 932 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
933 return 0;
934
f364cb88 935 code = finish_command(conn);
98158e9c 936 free(conn);
f364cb88 937 return code;
f7192598 938}