connect: handle putty/plink also in GIT_SSH_COMMAND
[git/git.git] / connect.c
CommitLineData
731043fd 1#include "git-compat-util.h"
f7192598 2#include "cache.h"
41cb7488 3#include "pkt-line.h"
b10d0ec7 4#include "quote.h"
6abf5c0c 5#include "refs.h"
15a1c012 6#include "run-command.h"
6b62816c 7#include "remote.h"
47a59185 8#include "connect.h"
9d2e9420 9#include "url.h"
a45b5f05 10#include "string-list.h"
13eb4626 11#include "sha1-array.h"
a5adaced 12#include "transport.h"
f7192598 13
96f1e58f 14static char *server_capabilities;
5d54cffc 15static const char *parse_feature_value(const char *, const char *, int *);
211b5f9e 16
be0b3f82 17static int check_ref(const char *name, unsigned int flags)
2718ff09
LT
18{
19 if (!flags)
20 return 1;
21
be0b3f82 22 if (!skip_prefix(name, "refs/", &name))
2718ff09
LT
23 return 0;
24
2718ff09 25 /* REF_NORMAL means that we don't want the magic fake tag refs */
8d9c5010 26 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
2718ff09
LT
27 return 0;
28
29 /* REF_HEADS means that we want regular branch heads */
be0b3f82 30 if ((flags & REF_HEADS) && starts_with(name, "heads/"))
2718ff09
LT
31 return 1;
32
33 /* REF_TAGS means that we want tags */
be0b3f82 34 if ((flags & REF_TAGS) && starts_with(name, "tags/"))
2718ff09
LT
35 return 1;
36
37 /* All type bits clear means that we are ok with anything */
38 return !(flags & ~REF_NORMAL);
39}
40
4577370e
DB
41int check_ref_type(const struct ref *ref, int flags)
42{
be0b3f82 43 return check_ref(ref->name, flags);
4577370e
DB
44}
45
55e4f936 46static void die_initial_contact(int unexpected)
46284dd1 47{
55e4f936 48 if (unexpected)
f2b93b38 49 die(_("The remote end hung up upon initial contact"));
46284dd1 50 else
f2b93b38
VA
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."));
46284dd1
HV
54}
55
a45b5f05
JH
56static 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" */
5c0b13f8 64 sym = xmemdupz(val, len);
a45b5f05
JH
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;
77reject:
78 free(sym);
79 return;
80}
81
82static 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 }
3383e199 97 string_list_sort(&symref);
a45b5f05
JH
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
d1c133f5
LT
109/*
110 * Read all the refs from the other end
111 */
85edf4f5
JK
112struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
113 struct ref **list, unsigned int flags,
b06dcd7d
NTND
114 struct sha1_array *extra_have,
115 struct sha1_array *shallow_points)
d1c133f5 116{
a45b5f05 117 struct ref **orig_list = list;
55e4f936
JN
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;
eb398797 126 int got_dummy_ref_with_capabilities_declaration = 0;
46284dd1 127
d1c133f5 128 *list = NULL;
55e4f936 129 for (saw_response = 0; ; saw_response = 1) {
d1c133f5 130 struct ref *ref;
e96b16cc 131 struct object_id old_oid;
d1c133f5 132 char *name;
211b5f9e 133 int len, name_len;
74543a04 134 char *buffer = packet_buffer;
ae021d87 135 const char *arg;
d1c133f5 136
85edf4f5 137 len = packet_read(in, &src_buf, &src_len,
4981fe75 138 packet_buffer, sizeof(packet_buffer),
819b929d
JK
139 PACKET_READ_GENTLE_ON_EOF |
140 PACKET_READ_CHOMP_NEWLINE);
46284dd1 141 if (len < 0)
55e4f936 142 die_initial_contact(saw_response);
46284dd1 143
d1c133f5
LT
144 if (!len)
145 break;
d1c133f5 146
ae021d87
JK
147 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
148 die("remote error: %s", arg);
a8073289 149
e96b16cc 150 if (len == GIT_SHA1_HEXSZ + strlen("shallow ") &&
151 skip_prefix(buffer, "shallow ", &arg)) {
152 if (get_oid_hex(arg, &old_oid))
ae021d87 153 die("protocol error: expected shallow sha-1, got '%s'", arg);
b06dcd7d
NTND
154 if (!shallow_points)
155 die("repository on the other end cannot be shallow");
e96b16cc 156 sha1_array_append(shallow_points, old_oid.hash);
b06dcd7d
NTND
157 continue;
158 }
159
e96b16cc 160 if (len < GIT_SHA1_HEXSZ + 2 || get_oid_hex(buffer, &old_oid) ||
161 buffer[GIT_SHA1_HEXSZ] != ' ')
d1c133f5 162 die("protocol error: expected sha/ref, got '%s'", buffer);
e96b16cc 163 name = buffer + GIT_SHA1_HEXSZ + 1;
1a7141ff 164
211b5f9e 165 name_len = strlen(name);
e96b16cc 166 if (len != name_len + GIT_SHA1_HEXSZ + 1) {
8e0f7003 167 free(server_capabilities);
9befac47 168 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
169 }
170
2ae7f90f 171 if (extra_have && !strcmp(name, ".have")) {
e96b16cc 172 sha1_array_append(extra_have, old_oid.hash);
40c155ff
JH
173 continue;
174 }
175
eb398797
JT
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
be0b3f82 185 if (!check_ref(name, flags))
cfee10a7 186 continue;
eb398797
JT
187
188 if (got_dummy_ref_with_capabilities_declaration)
189 die("protocol error: unexpected ref after capabilities^{}");
190
e96b16cc 191 ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
192 oidcpy(&ref->old_oid, &old_oid);
d1c133f5
LT
193 *list = ref;
194 list = &ref->next;
195 }
a45b5f05
JH
196
197 annotate_refs_with_symref_info(*orig_list);
198
d1c133f5
LT
199 return list;
200}
201
5d54cffc 202static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
f47182c8
JH
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;
94427108
JK
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 }
f47182c8
JH
234 feature_list = found + 1;
235 }
236 return NULL;
211b5f9e
JS
237}
238
94427108
JK
239int parse_feature_request(const char *feature_list, const char *feature)
240{
241 return !!parse_feature_value(feature_list, feature, NULL);
242}
243
244const char *server_feature_value(const char *feature, int *len)
245{
246 return parse_feature_value(server_capabilities, feature, len);
247}
248
249int server_supports(const char *feature)
250{
251 return !!server_feature_value(feature, NULL);
252}
253
2386d658
LT
254enum protocol {
255 PROTO_LOCAL = 1,
c59ab2e5 256 PROTO_FILE,
2386d658 257 PROTO_SSH,
4b05548f 258 PROTO_GIT
2386d658
LT
259};
260
c59ab2e5
TB
261int 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
5610b7c0
TB
269static const char *prot_name(enum protocol protocol)
270{
271 switch (protocol) {
272 case PROTO_LOCAL:
c59ab2e5 273 case PROTO_FILE:
5610b7c0
TB
274 return "file";
275 case PROTO_SSH:
276 return "ssh";
277 case PROTO_GIT:
278 return "git";
279 default:
83e6bda3 280 return "unknown protocol";
5610b7c0
TB
281 }
282}
283
2386d658
LT
284static 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;
07c7782c 290 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
c05186cc 291 return PROTO_SSH;
07c7782c 292 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
c05186cc 293 return PROTO_SSH;
72a4f4b6 294 if (!strcmp(name, "file"))
c59ab2e5 295 return PROTO_FILE;
2386d658
LT
296 die("I don't handle protocol '%s'", name);
297}
298
86ceb337
TB
299static 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
5ba88448
YH
323#define STR_(s) # s
324#define STR(s) STR_(s)
2386d658 325
72a534da
ML
326static void get_host_and_port(char **host, const char **port)
327{
328 char *colon, *end;
86ceb337 329 end = host_end(host, 1);
72a534da 330 colon = strchr(end, ':');
72a534da 331 if (colon) {
86ceb337
TB
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;
6b6c5f7a
TB
336 } else if (!colon[1]) {
337 *colon = 0;
86ceb337 338 }
72a534da
ML
339 }
340}
341
e47a8583
EW
342static 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
49744d63 351#ifndef NO_IPV6
4c505f71 352
ba505322
AR
353static const char *ai_name(const struct addrinfo *ai)
354{
785a9857
BK
355 static char addr[NI_MAXHOST];
356 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
357 NI_NUMERICHOST) != 0)
5096d490 358 xsnprintf(addr, sizeof(addr), "(unknown)");
785a9857 359
ba505322
AR
360 return addr;
361}
362
5ad312be
JL
363/*
364 * Returns a connected socket() fd, or else die()s.
365 */
7841ce79 366static int git_tcp_connect_sock(char *host, int flags)
2386d658 367{
63a995b6
DZ
368 struct strbuf error_message = STRBUF_INIT;
369 int sockfd = -1;
554fe20d 370 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
371 struct addrinfo hints, *ai0, *ai;
372 int gai;
ba505322 373 int cnt = 0;
5ba88448 374
72a534da
ML
375 get_host_and_port(&host, &port);
376 if (!*port)
377 port = "<none>";
5ba88448
YH
378
379 memset(&hints, 0, sizeof(hints));
c915f11e
EW
380 if (flags & CONNECT_IPV4)
381 hints.ai_family = AF_INET;
382 else if (flags & CONNECT_IPV6)
383 hints.ai_family = AF_INET6;
5ba88448
YH
384 hints.ai_socktype = SOCK_STREAM;
385 hints.ai_protocol = IPPROTO_TCP;
386
7841ce79
MT
387 if (flags & CONNECT_VERBOSE)
388 fprintf(stderr, "Looking up %s ... ", host);
389
5ba88448
YH
390 gai = getaddrinfo(host, port, &hints, &ai);
391 if (gai)
608d48b2 392 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 393
7841ce79
MT
394 if (flags & CONNECT_VERBOSE)
395 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
396
e08afecd 397 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
398 sockfd = socket(ai->ai_family,
399 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
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);
5ba88448
YH
406 sockfd = -1;
407 continue;
2386d658 408 }
ba505322
AR
409 if (flags & CONNECT_VERBOSE)
410 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 411 break;
2386d658
LT
412 }
413
5ba88448 414 freeaddrinfo(ai0);
2386d658 415
2386d658 416 if (sockfd < 0)
63a995b6 417 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 418
e47a8583
EW
419 enable_keepalive(sockfd);
420
7841ce79
MT
421 if (flags & CONNECT_VERBOSE)
422 fprintf(stderr, "done.\n");
423
63a995b6
DZ
424 strbuf_release(&error_message);
425
5ad312be 426 return sockfd;
2386d658
LT
427}
428
49744d63 429#else /* NO_IPV6 */
4c505f71 430
5ad312be
JL
431/*
432 * Returns a connected socket() fd, or else die()s.
433 */
7841ce79 434static int git_tcp_connect_sock(char *host, int flags)
4c505f71 435{
7203a2d1
EFL
436 struct strbuf error_message = STRBUF_INIT;
437 int sockfd = -1;
72a534da
ML
438 const char *port = STR(DEFAULT_GIT_PORT);
439 char *ep;
4c505f71
PA
440 struct hostent *he;
441 struct sockaddr_in sa;
442 char **ap;
443 unsigned int nport;
ba505322 444 int cnt;
4c505f71 445
72a534da 446 get_host_and_port(&host, &port);
4c505f71 447
7841ce79
MT
448 if (flags & CONNECT_VERBOSE)
449 fprintf(stderr, "Looking up %s ... ", host);
450
4c505f71
PA
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 )
d7530708 459 die("Unknown port %s", port);
4c505f71
PA
460 nport = se->s_port;
461 }
462
7841ce79
MT
463 if (flags & CONNECT_VERBOSE)
464 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
465
ba505322 466 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
467 memset(&sa, 0, sizeof sa);
468 sa.sin_family = he->h_addrtype;
6573faff 469 sa.sin_port = htons(nport);
c6164218 470 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 471
7203a2d1
EFL
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",
ba505322
AR
476 host,
477 cnt,
478 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
479 strerror(errno));
480 if (0 <= sockfd)
481 close(sockfd);
4c505f71
PA
482 sockfd = -1;
483 continue;
484 }
ba505322
AR
485 if (flags & CONNECT_VERBOSE)
486 fprintf(stderr, "%s ",
487 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
488 break;
489 }
490
491 if (sockfd < 0)
7203a2d1 492 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 493
e47a8583
EW
494 enable_keepalive(sockfd);
495
7841ce79
MT
496 if (flags & CONNECT_VERBOSE)
497 fprintf(stderr, "done.\n");
498
5ad312be
JL
499 return sockfd;
500}
501
502#endif /* NO_IPV6 */
503
504
7841ce79 505static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 506{
7841ce79 507 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 508
4c505f71 509 fd[0] = sockfd;
ec587fde 510 fd[1] = dup(sockfd);
4c505f71
PA
511}
512
4c505f71 513
96f1e58f 514static char *git_proxy_command;
f8014776 515
ef90d6d4
JS
516static int git_proxy_command_options(const char *var, const char *value,
517 void *cb)
f8014776 518{
e814bc4d 519 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
520 const char *for_pos;
521 int matchlen = -1;
522 int hostlen;
15112c95
EFL
523 const char *rhost_name = cb;
524 int rhost_len = strlen(rhost_name);
c3df8568 525
e814bc4d 526 if (git_proxy_command)
f8014776 527 return 0;
c64b9ad0
JH
528 if (!value)
529 return config_error_nonbool(var);
e814bc4d
JH
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 */
c3df8568 536 for_pos = strstr(value, " for ");
e814bc4d
JH
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 */
a6080a0a 555 if (matchlen == 4 &&
e814bc4d
JH
556 !memcmp(value, "none", 4))
557 matchlen = 0;
182af834 558 git_proxy_command = xmemdupz(value, matchlen);
f8014776 559 }
e814bc4d 560 return 0;
f8014776
PC
561 }
562
ef90d6d4 563 return git_default_config(var, value, cb);
f8014776
PC
564}
565
e814bc4d 566static int git_use_proxy(const char *host)
f8014776
PC
567{
568 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 569 git_config(git_proxy_command_options, (void*)host);
e814bc4d 570 return (git_proxy_command && *git_proxy_command);
f8014776
PC
571}
572
5cbf8246 573static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 574{
554fe20d 575 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246 576 struct child_process *proxy;
f8014776 577
72a534da 578 get_host_and_port(&host, &port);
f8014776 579
483bbd4e
RS
580 proxy = xmalloc(sizeof(*proxy));
581 child_process_init(proxy);
1823bea1
JK
582 argv_array_push(&proxy->args, git_proxy_command);
583 argv_array_push(&proxy->args, host);
584 argv_array_push(&proxy->args, port);
5cbf8246
JK
585 proxy->in = -1;
586 proxy->out = -1;
587 if (start_command(proxy))
1823bea1 588 die("cannot start proxy %s", git_proxy_command);
5cbf8246
JK
589 fd[0] = proxy->out; /* read from proxy stdout */
590 fd[1] = proxy->in; /* write to proxy stdin */
591 return proxy;
f8014776
PC
592}
593
86ceb337 594static char *get_port(char *host)
2e776665
LT
595{
596 char *end;
86ceb337
TB
597 char *p = strchr(host, ':');
598
2e776665 599 if (p) {
8f148253
RS
600 long port = strtol(p + 1, &end, 10);
601 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
86ceb337
TB
602 *p = '\0';
603 return p+1;
2e776665
LT
604 }
605 }
606
607 return NULL;
608}
609
f7192598 610/*
cabc3c12
JS
611 * Extract protocol and relevant parts from the specified connection URL.
612 * The caller must free() the returned strings.
f7192598 613 */
cabc3c12 614static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
83b05875 615 char **ret_path)
f7192598 616{
9d2e9420 617 char *url;
8e76bf3f 618 char *host, *path;
356bece0 619 char *end;
c59ab2e5 620 int separator = '/';
faea9ccb 621 enum protocol protocol = PROTO_LOCAL;
f0b7367c 622
9d2e9420
JK
623 if (is_url(url_orig))
624 url = url_decode(url_orig);
625 else
626 url = xstrdup(url_orig);
627
faea9ccb 628 host = strstr(url, "://");
eeefa7c9 629 if (host) {
faea9ccb
AE
630 *host = '\0';
631 protocol = get_protocol(url);
632 host += 3;
356bece0 633 } else {
f7192598 634 host = url;
c59ab2e5
TB
635 if (!url_is_local_not_ssh(url)) {
636 protocol = PROTO_SSH;
637 separator = ':';
638 }
356bece0
YH
639 }
640
9aa5053d 641 /*
83b05875
TB
642 * Don't do destructive transforms as protocol code does
643 * '[]' unwrapping in get_host_and_port()
9aa5053d 644 */
86ceb337 645 end = host_end(&host, 0);
356bece0 646
c59ab2e5 647 if (protocol == PROTO_LOCAL)
72a4f4b6 648 path = end;
c59ab2e5
TB
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);
2386d658 653
faea9ccb
AE
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 */
c59ab2e5
TB
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) {
faea9ccb
AE
666 if (path[1] == '~')
667 path++;
faea9ccb
AE
668 }
669
c59ab2e5
TB
670 path = xstrdup(path);
671 *end = '\0';
672
cabc3c12 673 *ret_host = xstrdup(host);
c59ab2e5 674 *ret_path = path;
cabc3c12
JS
675 free(url);
676 return protocol;
677}
678
d3180279 679static struct child_process no_fork = CHILD_PROCESS_INIT;
cabc3c12 680
3c8ede3f
NTND
681static 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
cabc3c12
JS
694/*
695 * This returns a dummy child_process if the transport protocol does not
696 * need fork(2), or a struct child_process object if it does. Once done,
697 * finish the connection with finish_connect() with the value returned from
698 * this function (it is safe to call finish_connect() with NULL to support
699 * the former case).
700 *
701 * If it returns, the connect is successful; it just dies on errors (this
702 * will hopefully be changed in a libification effort, to return NULL when
703 * the connection failed).
704 */
705struct child_process *git_connect(int fd[2], const char *url,
706 const char *prog, int flags)
707{
a2036d7e 708 char *hostandport, *path;
cabc3c12
JS
709 struct child_process *conn = &no_fork;
710 enum protocol protocol;
cabc3c12
JS
711 struct strbuf cmd = STRBUF_INIT;
712
713 /* Without this we cannot rely on waitpid() to tell
714 * what happened to our children.
2e776665 715 */
cabc3c12 716 signal(SIGCHLD, SIG_DFL);
2e776665 717
a2036d7e 718 protocol = parse_connect_url(url, &hostandport, &path);
3f55ccab 719 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
5610b7c0
TB
720 printf("Diag: url=%s\n", url ? url : "NULL");
721 printf("Diag: protocol=%s\n", prot_name(protocol));
a2036d7e 722 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
5610b7c0 723 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e
TB
724 conn = NULL;
725 } else if (protocol == PROTO_GIT) {
94bc83c5
JK
726 /*
727 * Set up virtual host information based on where we will
728 * connect, unless the user has overridden us in
729 * the environment.
730 */
731 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
732 if (target_host)
733 target_host = xstrdup(target_host);
734 else
735 target_host = xstrdup(hostandport);
736
a5adaced
JK
737 transport_check_allowed("git");
738
5ad312be
JL
739 /* These underlying connection commands die() if they
740 * cannot connect.
741 */
a2036d7e
TB
742 if (git_use_proxy(hostandport))
743 conn = git_proxy_connect(fd, hostandport);
da2a95b2 744 else
a2036d7e 745 git_tcp_connect(fd, hostandport, flags);
5ad312be
JL
746 /*
747 * Separate original protocol components prog and path
73bb33a9
SP
748 * from extended host header with a NUL byte.
749 *
750 * Note: Do not add any other headers here! Doing so
751 * will cause older git-daemon servers to crash.
5ad312be 752 */
81c634e9 753 packet_write_fmt(fd[1],
5ad312be
JL
754 "%s %s%chost=%s%c",
755 prog, path, 0,
756 target_host, 0);
757 free(target_host);
a2036d7e 758 } else {
483bbd4e
RS
759 conn = xmalloc(sizeof(*conn));
760 child_process_init(conn);
a2036d7e
TB
761
762 strbuf_addstr(&cmd, prog);
763 strbuf_addch(&cmd, ' ');
764 sq_quote_buf(&cmd, path);
765
aab40438
JK
766 /* remove repo-local variables from the environment */
767 conn->env = local_repo_env;
a48b409f 768 conn->use_shell = 1;
a2036d7e 769 conn->in = conn->out = -1;
a2036d7e 770 if (protocol == PROTO_SSH) {
39942766 771 const char *ssh;
a48b409f 772 int putty = 0, tortoiseplink = 0;
a2036d7e
TB
773 char *ssh_host = hostandport;
774 const char *port = NULL;
e9d9a8a4 775 char *ssh_argv0 = NULL;
a5adaced 776 transport_check_allowed("ssh");
a2036d7e 777 get_host_and_port(&ssh_host, &port);
a2036d7e 778
86ceb337
TB
779 if (!port)
780 port = get_port(ssh_host);
42da4840 781
3f55ccab
TB
782 if (flags & CONNECT_DIAG_URL) {
783 printf("Diag: url=%s\n", url ? url : "NULL");
784 printf("Diag: protocol=%s\n", prot_name(protocol));
785 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
786 printf("Diag: port=%s\n", port ? port : "NONE");
787 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e 788
3f55ccab
TB
789 free(hostandport);
790 free(path);
04f20c04 791 free(conn);
3f55ccab 792 return NULL;
37ee646e 793 }
794
3c8ede3f 795 ssh = get_ssh_command();
e9d9a8a4
SF
796 if (ssh) {
797 char *split_ssh = xstrdup(ssh);
798 const char **ssh_argv;
799
800 if (split_cmdline(split_ssh, &ssh_argv))
801 ssh_argv0 = xstrdup(ssh_argv[0]);
802 free(split_ssh);
803 free((void *)ssh_argv);
804 } else {
a48b409f
JK
805 /*
806 * GIT_SSH is the no-shell version of
807 * GIT_SSH_COMMAND (and must remain so for
808 * historical compatibility).
809 */
810 conn->use_shell = 0;
811
37ee646e 812 ssh = getenv("GIT_SSH");
813 if (!ssh)
814 ssh = "ssh";
baaf2337 815
e9d9a8a4
SF
816 ssh_argv0 = xstrdup(ssh);
817 }
818
819 if (ssh_argv0) {
820 const char *base = basename(ssh_argv0);
baaf2337 821
822 tortoiseplink = !strcasecmp(base, "tortoiseplink") ||
823 !strcasecmp(base, "tortoiseplink.exe");
a48b409f
JK
824 putty = tortoiseplink ||
825 !strcasecmp(base, "plink") ||
826 !strcasecmp(base, "plink.exe");
baaf2337 827
e9d9a8a4 828 free(ssh_argv0);
37ee646e 829 }
830
831 argv_array_push(&conn->args, ssh);
c915f11e
EW
832 if (flags & CONNECT_IPV4)
833 argv_array_push(&conn->args, "-4");
834 else if (flags & CONNECT_IPV6)
835 argv_array_push(&conn->args, "-6");
baaf2337 836 if (tortoiseplink)
37ee646e 837 argv_array_push(&conn->args, "-batch");
838 if (port) {
839 /* P is for PuTTY, p is for OpenSSH */
840 argv_array_push(&conn->args, putty ? "-P" : "-p");
841 argv_array_push(&conn->args, port);
a2036d7e 842 }
37ee646e 843 argv_array_push(&conn->args, ssh_host);
c049b61d 844 } else {
a5adaced 845 transport_check_allowed("file");
4852f723 846 }
1823bea1 847 argv_array_push(&conn->args, cmd.buf);
f364cb88 848
a2036d7e
TB
849 if (start_command(conn))
850 die("unable to fork");
f364cb88 851
a2036d7e
TB
852 fd[0] = conn->out; /* read from child's stdout */
853 fd[1] = conn->in; /* write to child's stdin */
854 strbuf_release(&cmd);
855 }
856 free(hostandport);
cabc3c12 857 free(path);
98158e9c 858 return conn;
f7192598
LT
859}
860
7ffe853b
JK
861int git_connection_is_socket(struct child_process *conn)
862{
863 return conn == &no_fork;
864}
865
98158e9c 866int finish_connect(struct child_process *conn)
f7192598 867{
f364cb88 868 int code;
7ffe853b 869 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
870 return 0;
871
f364cb88 872 code = finish_command(conn);
98158e9c 873 free(conn);
f364cb88 874 return code;
f7192598 875}