Merge branch 'maint-2.0' into maint-2.1
[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"
f7192598 12
96f1e58f 13static char *server_capabilities;
5d54cffc 14static const char *parse_feature_value(const char *, const char *, int *);
211b5f9e 15
2718ff09
LT
16static int check_ref(const char *name, int len, unsigned int flags)
17{
18 if (!flags)
19 return 1;
20
c41e20b3 21 if (len < 5 || memcmp(name, "refs/", 5))
2718ff09
LT
22 return 0;
23
24 /* Skip the "refs/" part */
25 name += 5;
26 len -= 5;
27
28 /* REF_NORMAL means that we don't want the magic fake tag refs */
8d9c5010 29 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
2718ff09
LT
30 return 0;
31
32 /* REF_HEADS means that we want regular branch heads */
33 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
34 return 1;
35
36 /* REF_TAGS means that we want tags */
37 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
38 return 1;
39
40 /* All type bits clear means that we are ok with anything */
41 return !(flags & ~REF_NORMAL);
42}
43
4577370e
DB
44int check_ref_type(const struct ref *ref, int flags)
45{
46 return check_ref(ref->name, strlen(ref->name), flags);
47}
48
46284dd1
HV
49static void die_initial_contact(int got_at_least_one_head)
50{
51 if (got_at_least_one_head)
52 die("The remote end hung up upon initial contact");
53 else
54 die("Could not read from remote repository.\n\n"
55 "Please make sure you have the correct access rights\n"
56 "and the repository exists.");
57}
58
a45b5f05
JH
59static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
60{
61 char *sym, *target;
62 struct string_list_item *item;
63
64 if (!len)
65 return; /* just "symref" */
66 /* e.g. "symref=HEAD:refs/heads/master" */
5c0b13f8 67 sym = xmemdupz(val, len);
a45b5f05
JH
68 target = strchr(sym, ':');
69 if (!target)
70 /* just "symref=something" */
71 goto reject;
72 *(target++) = '\0';
73 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
74 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
75 /* "symref=bogus:pair */
76 goto reject;
77 item = string_list_append(symref, sym);
78 item->util = target;
79 return;
80reject:
81 free(sym);
82 return;
83}
84
85static void annotate_refs_with_symref_info(struct ref *ref)
86{
87 struct string_list symref = STRING_LIST_INIT_DUP;
88 const char *feature_list = server_capabilities;
89
90 while (feature_list) {
91 int len;
92 const char *val;
93
94 val = parse_feature_value(feature_list, "symref", &len);
95 if (!val)
96 break;
97 parse_one_symref_info(&symref, val, len);
98 feature_list = val + 1;
99 }
100 sort_string_list(&symref);
101
102 for (; ref; ref = ref->next) {
103 struct string_list_item *item;
104 item = string_list_lookup(&symref, ref->name);
105 if (!item)
106 continue;
107 ref->symref = xstrdup((char *)item->util);
108 }
109 string_list_clear(&symref, 0);
110}
111
d1c133f5
LT
112/*
113 * Read all the refs from the other end
114 */
85edf4f5
JK
115struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
116 struct ref **list, unsigned int flags,
b06dcd7d
NTND
117 struct sha1_array *extra_have,
118 struct sha1_array *shallow_points)
d1c133f5 119{
a45b5f05 120 struct ref **orig_list = list;
46284dd1
HV
121 int got_at_least_one_head = 0;
122
d1c133f5
LT
123 *list = NULL;
124 for (;;) {
125 struct ref *ref;
126 unsigned char old_sha1[20];
d1c133f5 127 char *name;
211b5f9e 128 int len, name_len;
74543a04 129 char *buffer = packet_buffer;
ae021d87 130 const char *arg;
d1c133f5 131
85edf4f5 132 len = packet_read(in, &src_buf, &src_len,
4981fe75 133 packet_buffer, sizeof(packet_buffer),
819b929d
JK
134 PACKET_READ_GENTLE_ON_EOF |
135 PACKET_READ_CHOMP_NEWLINE);
46284dd1
HV
136 if (len < 0)
137 die_initial_contact(got_at_least_one_head);
138
d1c133f5
LT
139 if (!len)
140 break;
d1c133f5 141
ae021d87
JK
142 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
143 die("remote error: %s", arg);
a8073289 144
ae021d87
JK
145 if (len == 48 && skip_prefix(buffer, "shallow ", &arg)) {
146 if (get_sha1_hex(arg, old_sha1))
147 die("protocol error: expected shallow sha-1, got '%s'", arg);
b06dcd7d
NTND
148 if (!shallow_points)
149 die("repository on the other end cannot be shallow");
150 sha1_array_append(shallow_points, old_sha1);
151 continue;
152 }
153
d1c133f5
LT
154 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
155 die("protocol error: expected sha/ref, got '%s'", buffer);
156 name = buffer + 41;
1a7141ff 157
211b5f9e
JS
158 name_len = strlen(name);
159 if (len != name_len + 41) {
8e0f7003 160 free(server_capabilities);
9befac47 161 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
162 }
163
40c155ff
JH
164 if (extra_have &&
165 name_len == 5 && !memcmp(".have", name, 5)) {
13eb4626 166 sha1_array_append(extra_have, old_sha1);
40c155ff
JH
167 continue;
168 }
169
2718ff09 170 if (!check_ref(name, name_len, flags))
cfee10a7 171 continue;
59c69c0c 172 ref = alloc_ref(buffer + 41);
e702496e 173 hashcpy(ref->old_sha1, old_sha1);
d1c133f5
LT
174 *list = ref;
175 list = &ref->next;
46284dd1 176 got_at_least_one_head = 1;
d1c133f5 177 }
a45b5f05
JH
178
179 annotate_refs_with_symref_info(*orig_list);
180
d1c133f5
LT
181 return list;
182}
183
5d54cffc 184static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
f47182c8
JH
185{
186 int len;
187
188 if (!feature_list)
189 return NULL;
190
191 len = strlen(feature);
192 while (*feature_list) {
193 const char *found = strstr(feature_list, feature);
194 if (!found)
195 return NULL;
94427108
JK
196 if (feature_list == found || isspace(found[-1])) {
197 const char *value = found + len;
198 /* feature with no value (e.g., "thin-pack") */
199 if (!*value || isspace(*value)) {
200 if (lenp)
201 *lenp = 0;
202 return value;
203 }
204 /* feature with a value (e.g., "agent=git/1.2.3") */
205 else if (*value == '=') {
206 value++;
207 if (lenp)
208 *lenp = strcspn(value, " \t\n");
209 return value;
210 }
211 /*
212 * otherwise we matched a substring of another feature;
213 * keep looking
214 */
215 }
f47182c8
JH
216 feature_list = found + 1;
217 }
218 return NULL;
211b5f9e
JS
219}
220
94427108
JK
221int parse_feature_request(const char *feature_list, const char *feature)
222{
223 return !!parse_feature_value(feature_list, feature, NULL);
224}
225
226const char *server_feature_value(const char *feature, int *len)
227{
228 return parse_feature_value(server_capabilities, feature, len);
229}
230
231int server_supports(const char *feature)
232{
233 return !!server_feature_value(feature, NULL);
234}
235
2386d658
LT
236enum protocol {
237 PROTO_LOCAL = 1,
c59ab2e5 238 PROTO_FILE,
2386d658 239 PROTO_SSH,
4b05548f 240 PROTO_GIT
2386d658
LT
241};
242
c59ab2e5
TB
243int url_is_local_not_ssh(const char *url)
244{
245 const char *colon = strchr(url, ':');
246 const char *slash = strchr(url, '/');
247 return !colon || (slash && slash < colon) ||
248 has_dos_drive_prefix(url);
249}
250
5610b7c0
TB
251static const char *prot_name(enum protocol protocol)
252{
253 switch (protocol) {
254 case PROTO_LOCAL:
c59ab2e5 255 case PROTO_FILE:
5610b7c0
TB
256 return "file";
257 case PROTO_SSH:
258 return "ssh";
259 case PROTO_GIT:
260 return "git";
261 default:
262 return "unkown protocol";
263 }
264}
265
2386d658
LT
266static enum protocol get_protocol(const char *name)
267{
268 if (!strcmp(name, "ssh"))
269 return PROTO_SSH;
270 if (!strcmp(name, "git"))
271 return PROTO_GIT;
c05186cc
LT
272 if (!strcmp(name, "git+ssh"))
273 return PROTO_SSH;
274 if (!strcmp(name, "ssh+git"))
275 return PROTO_SSH;
72a4f4b6 276 if (!strcmp(name, "file"))
c59ab2e5 277 return PROTO_FILE;
2386d658
LT
278 die("I don't handle protocol '%s'", name);
279}
280
5ba88448
YH
281#define STR_(s) # s
282#define STR(s) STR_(s)
2386d658 283
72a534da
ML
284static void get_host_and_port(char **host, const char **port)
285{
286 char *colon, *end;
287
288 if (*host[0] == '[') {
289 end = strchr(*host + 1, ']');
290 if (end) {
291 *end = 0;
292 end++;
293 (*host)++;
294 } else
295 end = *host;
296 } else
297 end = *host;
298 colon = strchr(end, ':');
299
300 if (colon) {
301 *colon = 0;
302 *port = colon + 1;
303 }
304}
305
e47a8583
EW
306static void enable_keepalive(int sockfd)
307{
308 int ka = 1;
309
310 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
311 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
312 strerror(errno));
313}
314
49744d63 315#ifndef NO_IPV6
4c505f71 316
ba505322
AR
317static const char *ai_name(const struct addrinfo *ai)
318{
785a9857
BK
319 static char addr[NI_MAXHOST];
320 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
321 NI_NUMERICHOST) != 0)
ba505322 322 strcpy(addr, "(unknown)");
785a9857 323
ba505322
AR
324 return addr;
325}
326
5ad312be
JL
327/*
328 * Returns a connected socket() fd, or else die()s.
329 */
7841ce79 330static int git_tcp_connect_sock(char *host, int flags)
2386d658 331{
63a995b6
DZ
332 struct strbuf error_message = STRBUF_INIT;
333 int sockfd = -1;
554fe20d 334 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
335 struct addrinfo hints, *ai0, *ai;
336 int gai;
ba505322 337 int cnt = 0;
5ba88448 338
72a534da
ML
339 get_host_and_port(&host, &port);
340 if (!*port)
341 port = "<none>";
5ba88448
YH
342
343 memset(&hints, 0, sizeof(hints));
344 hints.ai_socktype = SOCK_STREAM;
345 hints.ai_protocol = IPPROTO_TCP;
346
7841ce79
MT
347 if (flags & CONNECT_VERBOSE)
348 fprintf(stderr, "Looking up %s ... ", host);
349
5ba88448
YH
350 gai = getaddrinfo(host, port, &hints, &ai);
351 if (gai)
608d48b2 352 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 353
7841ce79
MT
354 if (flags & CONNECT_VERBOSE)
355 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
356
e08afecd 357 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
358 sockfd = socket(ai->ai_family,
359 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
360 if ((sockfd < 0) ||
361 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
362 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
363 host, cnt, ai_name(ai), strerror(errno));
364 if (0 <= sockfd)
365 close(sockfd);
5ba88448
YH
366 sockfd = -1;
367 continue;
2386d658 368 }
ba505322
AR
369 if (flags & CONNECT_VERBOSE)
370 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 371 break;
2386d658
LT
372 }
373
5ba88448 374 freeaddrinfo(ai0);
2386d658 375
2386d658 376 if (sockfd < 0)
63a995b6 377 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 378
e47a8583
EW
379 enable_keepalive(sockfd);
380
7841ce79
MT
381 if (flags & CONNECT_VERBOSE)
382 fprintf(stderr, "done.\n");
383
63a995b6
DZ
384 strbuf_release(&error_message);
385
5ad312be 386 return sockfd;
2386d658
LT
387}
388
49744d63 389#else /* NO_IPV6 */
4c505f71 390
5ad312be
JL
391/*
392 * Returns a connected socket() fd, or else die()s.
393 */
7841ce79 394static int git_tcp_connect_sock(char *host, int flags)
4c505f71 395{
7203a2d1
EFL
396 struct strbuf error_message = STRBUF_INIT;
397 int sockfd = -1;
72a534da
ML
398 const char *port = STR(DEFAULT_GIT_PORT);
399 char *ep;
4c505f71
PA
400 struct hostent *he;
401 struct sockaddr_in sa;
402 char **ap;
403 unsigned int nport;
ba505322 404 int cnt;
4c505f71 405
72a534da 406 get_host_and_port(&host, &port);
4c505f71 407
7841ce79
MT
408 if (flags & CONNECT_VERBOSE)
409 fprintf(stderr, "Looking up %s ... ", host);
410
4c505f71
PA
411 he = gethostbyname(host);
412 if (!he)
413 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
414 nport = strtoul(port, &ep, 10);
415 if ( ep == port || *ep ) {
416 /* Not numeric */
417 struct servent *se = getservbyname(port,"tcp");
418 if ( !se )
d7530708 419 die("Unknown port %s", port);
4c505f71
PA
420 nport = se->s_port;
421 }
422
7841ce79
MT
423 if (flags & CONNECT_VERBOSE)
424 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
425
ba505322 426 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
427 memset(&sa, 0, sizeof sa);
428 sa.sin_family = he->h_addrtype;
6573faff 429 sa.sin_port = htons(nport);
c6164218 430 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 431
7203a2d1
EFL
432 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
433 if ((sockfd < 0) ||
434 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
435 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
ba505322
AR
436 host,
437 cnt,
438 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
439 strerror(errno));
440 if (0 <= sockfd)
441 close(sockfd);
4c505f71
PA
442 sockfd = -1;
443 continue;
444 }
ba505322
AR
445 if (flags & CONNECT_VERBOSE)
446 fprintf(stderr, "%s ",
447 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
448 break;
449 }
450
451 if (sockfd < 0)
7203a2d1 452 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 453
e47a8583
EW
454 enable_keepalive(sockfd);
455
7841ce79
MT
456 if (flags & CONNECT_VERBOSE)
457 fprintf(stderr, "done.\n");
458
5ad312be
JL
459 return sockfd;
460}
461
462#endif /* NO_IPV6 */
463
464
7841ce79 465static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 466{
7841ce79 467 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 468
4c505f71 469 fd[0] = sockfd;
ec587fde 470 fd[1] = dup(sockfd);
4c505f71
PA
471}
472
4c505f71 473
96f1e58f 474static char *git_proxy_command;
f8014776 475
ef90d6d4
JS
476static int git_proxy_command_options(const char *var, const char *value,
477 void *cb)
f8014776 478{
e814bc4d 479 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
480 const char *for_pos;
481 int matchlen = -1;
482 int hostlen;
15112c95
EFL
483 const char *rhost_name = cb;
484 int rhost_len = strlen(rhost_name);
c3df8568 485
e814bc4d 486 if (git_proxy_command)
f8014776 487 return 0;
c64b9ad0
JH
488 if (!value)
489 return config_error_nonbool(var);
e814bc4d
JH
490 /* [core]
491 * ;# matches www.kernel.org as well
492 * gitproxy = netcatter-1 for kernel.org
493 * gitproxy = netcatter-2 for sample.xz
494 * gitproxy = netcatter-default
495 */
c3df8568 496 for_pos = strstr(value, " for ");
e814bc4d
JH
497 if (!for_pos)
498 /* matches everybody */
499 matchlen = strlen(value);
500 else {
501 hostlen = strlen(for_pos + 5);
502 if (rhost_len < hostlen)
503 matchlen = -1;
504 else if (!strncmp(for_pos + 5,
505 rhost_name + rhost_len - hostlen,
506 hostlen) &&
507 ((rhost_len == hostlen) ||
508 rhost_name[rhost_len - hostlen -1] == '.'))
509 matchlen = for_pos - value;
510 else
511 matchlen = -1;
512 }
513 if (0 <= matchlen) {
514 /* core.gitproxy = none for kernel.org */
a6080a0a 515 if (matchlen == 4 &&
e814bc4d
JH
516 !memcmp(value, "none", 4))
517 matchlen = 0;
182af834 518 git_proxy_command = xmemdupz(value, matchlen);
f8014776 519 }
e814bc4d 520 return 0;
f8014776
PC
521 }
522
ef90d6d4 523 return git_default_config(var, value, cb);
f8014776
PC
524}
525
e814bc4d 526static int git_use_proxy(const char *host)
f8014776
PC
527{
528 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 529 git_config(git_proxy_command_options, (void*)host);
e814bc4d 530 return (git_proxy_command && *git_proxy_command);
f8014776
PC
531}
532
5cbf8246 533static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 534{
554fe20d 535 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246 536 struct child_process *proxy;
f8014776 537
72a534da 538 get_host_and_port(&host, &port);
f8014776 539
5cbf8246 540 proxy = xcalloc(1, sizeof(*proxy));
1823bea1
JK
541 argv_array_push(&proxy->args, git_proxy_command);
542 argv_array_push(&proxy->args, host);
543 argv_array_push(&proxy->args, port);
5cbf8246
JK
544 proxy->in = -1;
545 proxy->out = -1;
546 if (start_command(proxy))
1823bea1 547 die("cannot start proxy %s", git_proxy_command);
5cbf8246
JK
548 fd[0] = proxy->out; /* read from proxy stdout */
549 fd[1] = proxy->in; /* write to proxy stdin */
550 return proxy;
f8014776
PC
551}
552
83b05875 553static const char *get_port_numeric(const char *p)
2e776665
LT
554{
555 char *end;
2e776665 556 if (p) {
8f148253
RS
557 long port = strtol(p + 1, &end, 10);
558 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
83b05875 559 return p;
2e776665
LT
560 }
561 }
562
563 return NULL;
564}
565
f7192598 566/*
cabc3c12
JS
567 * Extract protocol and relevant parts from the specified connection URL.
568 * The caller must free() the returned strings.
f7192598 569 */
cabc3c12 570static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
83b05875 571 char **ret_path)
f7192598 572{
9d2e9420 573 char *url;
8e76bf3f 574 char *host, *path;
356bece0 575 char *end;
c59ab2e5 576 int separator = '/';
faea9ccb 577 enum protocol protocol = PROTO_LOCAL;
f0b7367c 578
9d2e9420
JK
579 if (is_url(url_orig))
580 url = url_decode(url_orig);
581 else
582 url = xstrdup(url_orig);
583
faea9ccb 584 host = strstr(url, "://");
eeefa7c9 585 if (host) {
faea9ccb
AE
586 *host = '\0';
587 protocol = get_protocol(url);
588 host += 3;
356bece0 589 } else {
f7192598 590 host = url;
c59ab2e5
TB
591 if (!url_is_local_not_ssh(url)) {
592 protocol = PROTO_SSH;
593 separator = ':';
594 }
356bece0
YH
595 }
596
9aa5053d 597 /*
83b05875
TB
598 * Don't do destructive transforms as protocol code does
599 * '[]' unwrapping in get_host_and_port()
9aa5053d 600 */
356bece0
YH
601 if (host[0] == '[') {
602 end = strchr(host + 1, ']');
603 if (end) {
356bece0 604 end++;
356bece0
YH
605 } else
606 end = host;
607 } else
608 end = host;
609
c59ab2e5 610 if (protocol == PROTO_LOCAL)
72a4f4b6 611 path = end;
c59ab2e5
TB
612 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
613 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
614 else
615 path = strchr(end, separator);
2386d658 616
faea9ccb
AE
617 if (!path || !*path)
618 die("No path specified. See 'man git-pull' for valid url syntax");
619
620 /*
621 * null-terminate hostname and point path to ~ for URL's like this:
622 * ssh://host.xz/~user/repo
623 */
c59ab2e5
TB
624
625 end = path; /* Need to \0 terminate host here */
626 if (separator == ':')
627 path++; /* path starts after ':' */
628 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
faea9ccb
AE
629 if (path[1] == '~')
630 path++;
faea9ccb
AE
631 }
632
c59ab2e5
TB
633 path = xstrdup(path);
634 *end = '\0';
635
cabc3c12 636 *ret_host = xstrdup(host);
c59ab2e5 637 *ret_path = path;
cabc3c12
JS
638 free(url);
639 return protocol;
640}
641
642static struct child_process no_fork;
643
644/*
645 * This returns a dummy child_process if the transport protocol does not
646 * need fork(2), or a struct child_process object if it does. Once done,
647 * finish the connection with finish_connect() with the value returned from
648 * this function (it is safe to call finish_connect() with NULL to support
649 * the former case).
650 *
651 * If it returns, the connect is successful; it just dies on errors (this
652 * will hopefully be changed in a libification effort, to return NULL when
653 * the connection failed).
654 */
655struct child_process *git_connect(int fd[2], const char *url,
656 const char *prog, int flags)
657{
a2036d7e 658 char *hostandport, *path;
cabc3c12
JS
659 struct child_process *conn = &no_fork;
660 enum protocol protocol;
cabc3c12
JS
661 struct strbuf cmd = STRBUF_INIT;
662
663 /* Without this we cannot rely on waitpid() to tell
664 * what happened to our children.
2e776665 665 */
cabc3c12 666 signal(SIGCHLD, SIG_DFL);
2e776665 667
a2036d7e 668 protocol = parse_connect_url(url, &hostandport, &path);
5610b7c0
TB
669 if (flags & CONNECT_DIAG_URL) {
670 printf("Diag: url=%s\n", url ? url : "NULL");
671 printf("Diag: protocol=%s\n", prot_name(protocol));
a2036d7e 672 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
5610b7c0 673 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e
TB
674 conn = NULL;
675 } else if (protocol == PROTO_GIT) {
5ad312be
JL
676 /* These underlying connection commands die() if they
677 * cannot connect.
678 */
a2036d7e
TB
679 char *target_host = xstrdup(hostandport);
680 if (git_use_proxy(hostandport))
681 conn = git_proxy_connect(fd, hostandport);
da2a95b2 682 else
a2036d7e 683 git_tcp_connect(fd, hostandport, flags);
5ad312be
JL
684 /*
685 * Separate original protocol components prog and path
73bb33a9
SP
686 * from extended host header with a NUL byte.
687 *
688 * Note: Do not add any other headers here! Doing so
689 * will cause older git-daemon servers to crash.
5ad312be
JL
690 */
691 packet_write(fd[1],
692 "%s %s%chost=%s%c",
693 prog, path, 0,
694 target_host, 0);
695 free(target_host);
a2036d7e
TB
696 } else {
697 conn = xcalloc(1, sizeof(*conn));
698
699 strbuf_addstr(&cmd, prog);
700 strbuf_addch(&cmd, ' ');
701 sq_quote_buf(&cmd, path);
702
703 conn->in = conn->out = -1;
a2036d7e
TB
704 if (protocol == PROTO_SSH) {
705 const char *ssh = getenv("GIT_SSH");
706 int putty = ssh && strcasestr(ssh, "plink");
707 char *ssh_host = hostandport;
708 const char *port = NULL;
709 get_host_and_port(&ssh_host, &port);
710 port = get_port_numeric(port);
711
712 if (!ssh) ssh = "ssh";
713
1823bea1 714 argv_array_push(&conn->args, ssh);
a2036d7e 715 if (putty && !strcasestr(ssh, "tortoiseplink"))
1823bea1 716 argv_array_push(&conn->args, "-batch");
a2036d7e
TB
717 if (port) {
718 /* P is for PuTTY, p is for OpenSSH */
1823bea1
JK
719 argv_array_push(&conn->args, putty ? "-P" : "-p");
720 argv_array_push(&conn->args, port);
a2036d7e 721 }
1823bea1 722 argv_array_push(&conn->args, ssh_host);
c049b61d 723 } else {
a2036d7e
TB
724 /* remove repo-local variables from the environment */
725 conn->env = local_repo_env;
726 conn->use_shell = 1;
4852f723 727 }
1823bea1 728 argv_array_push(&conn->args, cmd.buf);
f364cb88 729
a2036d7e
TB
730 if (start_command(conn))
731 die("unable to fork");
f364cb88 732
a2036d7e
TB
733 fd[0] = conn->out; /* read from child's stdout */
734 fd[1] = conn->in; /* write to child's stdin */
735 strbuf_release(&cmd);
736 }
737 free(hostandport);
cabc3c12 738 free(path);
98158e9c 739 return conn;
f7192598
LT
740}
741
7ffe853b
JK
742int git_connection_is_socket(struct child_process *conn)
743{
744 return conn == &no_fork;
745}
746
98158e9c 747int finish_connect(struct child_process *conn)
f7192598 748{
f364cb88 749 int code;
7ffe853b 750 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
751 return 0;
752
f364cb88 753 code = finish_command(conn);
98158e9c 754 free(conn);
f364cb88 755 return code;
f7192598 756}