git_connect: factor out discovery of the protocol and its parts
[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"
f7192598 11
96f1e58f 12static char *server_capabilities;
5d54cffc 13static const char *parse_feature_value(const char *, const char *, int *);
211b5f9e 14
2718ff09
LT
15static int check_ref(const char *name, int len, unsigned int flags)
16{
17 if (!flags)
18 return 1;
19
c41e20b3 20 if (len < 5 || memcmp(name, "refs/", 5))
2718ff09
LT
21 return 0;
22
23 /* Skip the "refs/" part */
24 name += 5;
25 len -= 5;
26
27 /* REF_NORMAL means that we don't want the magic fake tag refs */
8d9c5010 28 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
2718ff09
LT
29 return 0;
30
31 /* REF_HEADS means that we want regular branch heads */
32 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
33 return 1;
34
35 /* REF_TAGS means that we want tags */
36 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
37 return 1;
38
39 /* All type bits clear means that we are ok with anything */
40 return !(flags & ~REF_NORMAL);
41}
42
4577370e
DB
43int check_ref_type(const struct ref *ref, int flags)
44{
45 return check_ref(ref->name, strlen(ref->name), flags);
46}
47
40c155ff
JH
48static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
49{
50 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
51 hashcpy(&(extra->array[extra->nr][0]), sha1);
52 extra->nr++;
53}
54
46284dd1
HV
55static void die_initial_contact(int got_at_least_one_head)
56{
57 if (got_at_least_one_head)
58 die("The remote end hung up upon initial contact");
59 else
60 die("Could not read from remote repository.\n\n"
61 "Please make sure you have the correct access rights\n"
62 "and the repository exists.");
63}
64
a45b5f05
JH
65static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
66{
67 char *sym, *target;
68 struct string_list_item *item;
69
70 if (!len)
71 return; /* just "symref" */
72 /* e.g. "symref=HEAD:refs/heads/master" */
73 sym = xmalloc(len + 1);
74 memcpy(sym, val, len);
75 sym[len] = '\0';
76 target = strchr(sym, ':');
77 if (!target)
78 /* just "symref=something" */
79 goto reject;
80 *(target++) = '\0';
81 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
82 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
83 /* "symref=bogus:pair */
84 goto reject;
85 item = string_list_append(symref, sym);
86 item->util = target;
87 return;
88reject:
89 free(sym);
90 return;
91}
92
93static void annotate_refs_with_symref_info(struct ref *ref)
94{
95 struct string_list symref = STRING_LIST_INIT_DUP;
96 const char *feature_list = server_capabilities;
97
98 while (feature_list) {
99 int len;
100 const char *val;
101
102 val = parse_feature_value(feature_list, "symref", &len);
103 if (!val)
104 break;
105 parse_one_symref_info(&symref, val, len);
106 feature_list = val + 1;
107 }
108 sort_string_list(&symref);
109
110 for (; ref; ref = ref->next) {
111 struct string_list_item *item;
112 item = string_list_lookup(&symref, ref->name);
113 if (!item)
114 continue;
115 ref->symref = xstrdup((char *)item->util);
116 }
117 string_list_clear(&symref, 0);
118}
119
d1c133f5
LT
120/*
121 * Read all the refs from the other end
122 */
85edf4f5
JK
123struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
124 struct ref **list, unsigned int flags,
40c155ff 125 struct extra_have_objects *extra_have)
d1c133f5 126{
a45b5f05 127 struct ref **orig_list = list;
46284dd1
HV
128 int got_at_least_one_head = 0;
129
d1c133f5
LT
130 *list = NULL;
131 for (;;) {
132 struct ref *ref;
133 unsigned char old_sha1[20];
d1c133f5 134 char *name;
211b5f9e 135 int len, name_len;
74543a04 136 char *buffer = packet_buffer;
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
HV
142 if (len < 0)
143 die_initial_contact(got_at_least_one_head);
144
d1c133f5
LT
145 if (!len)
146 break;
d1c133f5 147
a8073289
TPW
148 if (len > 4 && !prefixcmp(buffer, "ERR "))
149 die("remote error: %s", buffer + 4);
150
d1c133f5
LT
151 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
152 die("protocol error: expected sha/ref, got '%s'", buffer);
153 name = buffer + 41;
1a7141ff 154
211b5f9e
JS
155 name_len = strlen(name);
156 if (len != name_len + 41) {
8e0f7003 157 free(server_capabilities);
9befac47 158 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
159 }
160
40c155ff
JH
161 if (extra_have &&
162 name_len == 5 && !memcmp(".have", name, 5)) {
163 add_extra_have(extra_have, old_sha1);
164 continue;
165 }
166
2718ff09 167 if (!check_ref(name, name_len, flags))
cfee10a7 168 continue;
59c69c0c 169 ref = alloc_ref(buffer + 41);
e702496e 170 hashcpy(ref->old_sha1, old_sha1);
d1c133f5
LT
171 *list = ref;
172 list = &ref->next;
46284dd1 173 got_at_least_one_head = 1;
d1c133f5 174 }
a45b5f05
JH
175
176 annotate_refs_with_symref_info(*orig_list);
177
d1c133f5
LT
178 return list;
179}
180
5d54cffc 181static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
f47182c8
JH
182{
183 int len;
184
185 if (!feature_list)
186 return NULL;
187
188 len = strlen(feature);
189 while (*feature_list) {
190 const char *found = strstr(feature_list, feature);
191 if (!found)
192 return NULL;
94427108
JK
193 if (feature_list == found || isspace(found[-1])) {
194 const char *value = found + len;
195 /* feature with no value (e.g., "thin-pack") */
196 if (!*value || isspace(*value)) {
197 if (lenp)
198 *lenp = 0;
199 return value;
200 }
201 /* feature with a value (e.g., "agent=git/1.2.3") */
202 else if (*value == '=') {
203 value++;
204 if (lenp)
205 *lenp = strcspn(value, " \t\n");
206 return value;
207 }
208 /*
209 * otherwise we matched a substring of another feature;
210 * keep looking
211 */
212 }
f47182c8
JH
213 feature_list = found + 1;
214 }
215 return NULL;
211b5f9e
JS
216}
217
94427108
JK
218int parse_feature_request(const char *feature_list, const char *feature)
219{
220 return !!parse_feature_value(feature_list, feature, NULL);
221}
222
223const char *server_feature_value(const char *feature, int *len)
224{
225 return parse_feature_value(server_capabilities, feature, len);
226}
227
228int server_supports(const char *feature)
229{
230 return !!server_feature_value(feature, NULL);
231}
232
2386d658
LT
233enum protocol {
234 PROTO_LOCAL = 1,
235 PROTO_SSH,
4b05548f 236 PROTO_GIT
2386d658
LT
237};
238
239static enum protocol get_protocol(const char *name)
240{
241 if (!strcmp(name, "ssh"))
242 return PROTO_SSH;
243 if (!strcmp(name, "git"))
244 return PROTO_GIT;
c05186cc
LT
245 if (!strcmp(name, "git+ssh"))
246 return PROTO_SSH;
247 if (!strcmp(name, "ssh+git"))
248 return PROTO_SSH;
72a4f4b6
LT
249 if (!strcmp(name, "file"))
250 return PROTO_LOCAL;
2386d658
LT
251 die("I don't handle protocol '%s'", name);
252}
253
5ba88448
YH
254#define STR_(s) # s
255#define STR(s) STR_(s)
2386d658 256
72a534da
ML
257static void get_host_and_port(char **host, const char **port)
258{
259 char *colon, *end;
260
261 if (*host[0] == '[') {
262 end = strchr(*host + 1, ']');
263 if (end) {
264 *end = 0;
265 end++;
266 (*host)++;
267 } else
268 end = *host;
269 } else
270 end = *host;
271 colon = strchr(end, ':');
272
273 if (colon) {
274 *colon = 0;
275 *port = colon + 1;
276 }
277}
278
e47a8583
EW
279static void enable_keepalive(int sockfd)
280{
281 int ka = 1;
282
283 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
284 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
285 strerror(errno));
286}
287
49744d63 288#ifndef NO_IPV6
4c505f71 289
ba505322
AR
290static const char *ai_name(const struct addrinfo *ai)
291{
785a9857
BK
292 static char addr[NI_MAXHOST];
293 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
294 NI_NUMERICHOST) != 0)
ba505322 295 strcpy(addr, "(unknown)");
785a9857 296
ba505322
AR
297 return addr;
298}
299
5ad312be
JL
300/*
301 * Returns a connected socket() fd, or else die()s.
302 */
7841ce79 303static int git_tcp_connect_sock(char *host, int flags)
2386d658 304{
63a995b6
DZ
305 struct strbuf error_message = STRBUF_INIT;
306 int sockfd = -1;
554fe20d 307 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
308 struct addrinfo hints, *ai0, *ai;
309 int gai;
ba505322 310 int cnt = 0;
5ba88448 311
72a534da
ML
312 get_host_and_port(&host, &port);
313 if (!*port)
314 port = "<none>";
5ba88448
YH
315
316 memset(&hints, 0, sizeof(hints));
317 hints.ai_socktype = SOCK_STREAM;
318 hints.ai_protocol = IPPROTO_TCP;
319
7841ce79
MT
320 if (flags & CONNECT_VERBOSE)
321 fprintf(stderr, "Looking up %s ... ", host);
322
5ba88448
YH
323 gai = getaddrinfo(host, port, &hints, &ai);
324 if (gai)
608d48b2 325 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 326
7841ce79
MT
327 if (flags & CONNECT_VERBOSE)
328 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
329
e08afecd 330 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
331 sockfd = socket(ai->ai_family,
332 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
333 if ((sockfd < 0) ||
334 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
335 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
336 host, cnt, ai_name(ai), strerror(errno));
337 if (0 <= sockfd)
338 close(sockfd);
5ba88448
YH
339 sockfd = -1;
340 continue;
2386d658 341 }
ba505322
AR
342 if (flags & CONNECT_VERBOSE)
343 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 344 break;
2386d658
LT
345 }
346
5ba88448 347 freeaddrinfo(ai0);
2386d658 348
2386d658 349 if (sockfd < 0)
63a995b6 350 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 351
e47a8583
EW
352 enable_keepalive(sockfd);
353
7841ce79
MT
354 if (flags & CONNECT_VERBOSE)
355 fprintf(stderr, "done.\n");
356
63a995b6
DZ
357 strbuf_release(&error_message);
358
5ad312be 359 return sockfd;
2386d658
LT
360}
361
49744d63 362#else /* NO_IPV6 */
4c505f71 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)
4c505f71 368{
7203a2d1
EFL
369 struct strbuf error_message = STRBUF_INIT;
370 int sockfd = -1;
72a534da
ML
371 const char *port = STR(DEFAULT_GIT_PORT);
372 char *ep;
4c505f71
PA
373 struct hostent *he;
374 struct sockaddr_in sa;
375 char **ap;
376 unsigned int nport;
ba505322 377 int cnt;
4c505f71 378
72a534da 379 get_host_and_port(&host, &port);
4c505f71 380
7841ce79
MT
381 if (flags & CONNECT_VERBOSE)
382 fprintf(stderr, "Looking up %s ... ", host);
383
4c505f71
PA
384 he = gethostbyname(host);
385 if (!he)
386 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
387 nport = strtoul(port, &ep, 10);
388 if ( ep == port || *ep ) {
389 /* Not numeric */
390 struct servent *se = getservbyname(port,"tcp");
391 if ( !se )
d7530708 392 die("Unknown port %s", port);
4c505f71
PA
393 nport = se->s_port;
394 }
395
7841ce79
MT
396 if (flags & CONNECT_VERBOSE)
397 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
398
ba505322 399 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
400 memset(&sa, 0, sizeof sa);
401 sa.sin_family = he->h_addrtype;
6573faff 402 sa.sin_port = htons(nport);
c6164218 403 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 404
7203a2d1
EFL
405 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
406 if ((sockfd < 0) ||
407 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
408 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
ba505322
AR
409 host,
410 cnt,
411 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
412 strerror(errno));
413 if (0 <= sockfd)
414 close(sockfd);
4c505f71
PA
415 sockfd = -1;
416 continue;
417 }
ba505322
AR
418 if (flags & CONNECT_VERBOSE)
419 fprintf(stderr, "%s ",
420 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
421 break;
422 }
423
424 if (sockfd < 0)
7203a2d1 425 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 426
e47a8583
EW
427 enable_keepalive(sockfd);
428
7841ce79
MT
429 if (flags & CONNECT_VERBOSE)
430 fprintf(stderr, "done.\n");
431
5ad312be
JL
432 return sockfd;
433}
434
435#endif /* NO_IPV6 */
436
437
7841ce79 438static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 439{
7841ce79 440 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 441
4c505f71 442 fd[0] = sockfd;
ec587fde 443 fd[1] = dup(sockfd);
4c505f71
PA
444}
445
4c505f71 446
96f1e58f 447static char *git_proxy_command;
f8014776 448
ef90d6d4
JS
449static int git_proxy_command_options(const char *var, const char *value,
450 void *cb)
f8014776 451{
e814bc4d 452 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
453 const char *for_pos;
454 int matchlen = -1;
455 int hostlen;
15112c95
EFL
456 const char *rhost_name = cb;
457 int rhost_len = strlen(rhost_name);
c3df8568 458
e814bc4d 459 if (git_proxy_command)
f8014776 460 return 0;
c64b9ad0
JH
461 if (!value)
462 return config_error_nonbool(var);
e814bc4d
JH
463 /* [core]
464 * ;# matches www.kernel.org as well
465 * gitproxy = netcatter-1 for kernel.org
466 * gitproxy = netcatter-2 for sample.xz
467 * gitproxy = netcatter-default
468 */
c3df8568 469 for_pos = strstr(value, " for ");
e814bc4d
JH
470 if (!for_pos)
471 /* matches everybody */
472 matchlen = strlen(value);
473 else {
474 hostlen = strlen(for_pos + 5);
475 if (rhost_len < hostlen)
476 matchlen = -1;
477 else if (!strncmp(for_pos + 5,
478 rhost_name + rhost_len - hostlen,
479 hostlen) &&
480 ((rhost_len == hostlen) ||
481 rhost_name[rhost_len - hostlen -1] == '.'))
482 matchlen = for_pos - value;
483 else
484 matchlen = -1;
485 }
486 if (0 <= matchlen) {
487 /* core.gitproxy = none for kernel.org */
a6080a0a 488 if (matchlen == 4 &&
e814bc4d
JH
489 !memcmp(value, "none", 4))
490 matchlen = 0;
182af834 491 git_proxy_command = xmemdupz(value, matchlen);
f8014776 492 }
e814bc4d 493 return 0;
f8014776
PC
494 }
495
ef90d6d4 496 return git_default_config(var, value, cb);
f8014776
PC
497}
498
e814bc4d 499static int git_use_proxy(const char *host)
f8014776
PC
500{
501 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 502 git_config(git_proxy_command_options, (void*)host);
e814bc4d 503 return (git_proxy_command && *git_proxy_command);
f8014776
PC
504}
505
5cbf8246 506static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 507{
554fe20d 508 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246
JK
509 const char **argv;
510 struct child_process *proxy;
f8014776 511
72a534da 512 get_host_and_port(&host, &port);
f8014776 513
5cbf8246 514 argv = xmalloc(sizeof(*argv) * 4);
15a1c012
SP
515 argv[0] = git_proxy_command;
516 argv[1] = host;
517 argv[2] = port;
518 argv[3] = NULL;
5cbf8246
JK
519 proxy = xcalloc(1, sizeof(*proxy));
520 proxy->argv = argv;
521 proxy->in = -1;
522 proxy->out = -1;
523 if (start_command(proxy))
15a1c012 524 die("cannot start proxy %s", argv[0]);
5cbf8246
JK
525 fd[0] = proxy->out; /* read from proxy stdout */
526 fd[1] = proxy->in; /* write to proxy stdin */
527 return proxy;
f8014776
PC
528}
529
2af202be 530static char *get_port(char *host)
2e776665
LT
531{
532 char *end;
533 char *p = strchr(host, ':');
534
535 if (p) {
8f148253
RS
536 long port = strtol(p + 1, &end, 10);
537 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
2e776665
LT
538 *p = '\0';
539 return p+1;
540 }
541 }
542
543 return NULL;
544}
545
f7192598 546/*
cabc3c12
JS
547 * Extract protocol and relevant parts from the specified connection URL.
548 * The caller must free() the returned strings.
f7192598 549 */
cabc3c12
JS
550static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
551 char **ret_port, char **ret_path)
f7192598 552{
9d2e9420 553 char *url;
8e76bf3f 554 char *host, *path;
356bece0
YH
555 char *end;
556 int c;
faea9ccb 557 enum protocol protocol = PROTO_LOCAL;
da2a95b2 558 int free_path = 0;
2e776665 559 char *port = NULL;
f0b7367c 560
9d2e9420
JK
561 if (is_url(url_orig))
562 url = url_decode(url_orig);
563 else
564 url = xstrdup(url_orig);
565
faea9ccb 566 host = strstr(url, "://");
eeefa7c9 567 if (host) {
faea9ccb
AE
568 *host = '\0';
569 protocol = get_protocol(url);
570 host += 3;
356bece0
YH
571 c = '/';
572 } else {
f7192598 573 host = url;
356bece0
YH
574 c = ':';
575 }
576
9aa5053d
IL
577 /*
578 * Don't do destructive transforms with git:// as that
9517e6b8 579 * protocol code does '[]' unwrapping of its own.
9aa5053d 580 */
356bece0
YH
581 if (host[0] == '[') {
582 end = strchr(host + 1, ']');
583 if (end) {
9aa5053d
IL
584 if (protocol != PROTO_GIT) {
585 *end = 0;
586 host++;
587 }
356bece0 588 end++;
356bece0
YH
589 } else
590 end = host;
591 } else
592 end = host;
593
594 path = strchr(end, c);
be501813 595 if (path && !has_dos_drive_prefix(end)) {
72a4f4b6 596 if (c == ':') {
8d3d28f5 597 if (host != url || path < strchrnul(host, '/')) {
60003340
NTND
598 protocol = PROTO_SSH;
599 *path++ = '\0';
600 } else /* '/' in the host part, assume local path */
601 path = end;
72a4f4b6
LT
602 }
603 } else
604 path = end;
2386d658 605
faea9ccb
AE
606 if (!path || !*path)
607 die("No path specified. See 'man git-pull' for valid url syntax");
608
609 /*
610 * null-terminate hostname and point path to ~ for URL's like this:
611 * ssh://host.xz/~user/repo
612 */
613 if (protocol != PROTO_LOCAL && host != url) {
614 char *ptr = path;
615 if (path[1] == '~')
616 path++;
da2a95b2 617 else {
9befac47 618 path = xstrdup(ptr);
da2a95b2
SH
619 free_path = 1;
620 }
faea9ccb
AE
621
622 *ptr = '\0';
623 }
624
2e776665
LT
625 /*
626 * Add support for ssh port: ssh://host.xy:<port>/...
627 */
628 if (protocol == PROTO_SSH && host != url)
7acf4382 629 port = get_port(end);
2e776665 630
cabc3c12
JS
631 *ret_host = xstrdup(host);
632 if (port)
633 *ret_port = xstrdup(port);
634 else
635 *ret_port = NULL;
636 if (free_path)
637 *ret_path = path;
638 else
639 *ret_path = xstrdup(path);
640 free(url);
641 return protocol;
642}
643
644static struct child_process no_fork;
645
646/*
647 * This returns a dummy child_process if the transport protocol does not
648 * need fork(2), or a struct child_process object if it does. Once done,
649 * finish the connection with finish_connect() with the value returned from
650 * this function (it is safe to call finish_connect() with NULL to support
651 * the former case).
652 *
653 * If it returns, the connect is successful; it just dies on errors (this
654 * will hopefully be changed in a libification effort, to return NULL when
655 * the connection failed).
656 */
657struct child_process *git_connect(int fd[2], const char *url,
658 const char *prog, int flags)
659{
660 char *host, *path;
661 struct child_process *conn = &no_fork;
662 enum protocol protocol;
663 char *port;
664 const char **arg;
665 struct strbuf cmd = STRBUF_INIT;
666
667 /* Without this we cannot rely on waitpid() to tell
668 * what happened to our children.
669 */
670 signal(SIGCHLD, SIG_DFL);
671
672 protocol = parse_connect_url(url, &host, &port, &path);
673
f8014776 674 if (protocol == PROTO_GIT) {
5ad312be
JL
675 /* These underlying connection commands die() if they
676 * cannot connect.
677 */
9befac47 678 char *target_host = xstrdup(host);
e814bc4d 679 if (git_use_proxy(host))
5cbf8246 680 conn = git_proxy_connect(fd, host);
da2a95b2 681 else
7841ce79 682 git_tcp_connect(fd, host, flags);
5ad312be
JL
683 /*
684 * Separate original protocol components prog and path
73bb33a9
SP
685 * from extended host header with a NUL byte.
686 *
687 * Note: Do not add any other headers here! Doing so
688 * will cause older git-daemon servers to crash.
5ad312be
JL
689 */
690 packet_write(fd[1],
691 "%s %s%chost=%s%c",
692 prog, path, 0,
693 target_host, 0);
694 free(target_host);
cabc3c12
JS
695 free(host);
696 free(port);
697 free(path);
5cbf8246 698 return conn;
f8014776 699 }
2386d658 700
98158e9c 701 conn = xcalloc(1, sizeof(*conn));
2e776665 702
f364cb88
JS
703 strbuf_addstr(&cmd, prog);
704 strbuf_addch(&cmd, ' ');
705 sq_quote_buf(&cmd, path);
f364cb88
JS
706
707 conn->in = conn->out = -1;
36ad53ff 708 conn->argv = arg = xcalloc(7, sizeof(*arg));
f364cb88
JS
709 if (protocol == PROTO_SSH) {
710 const char *ssh = getenv("GIT_SSH");
36ad53ff 711 int putty = ssh && strcasestr(ssh, "plink");
f364cb88
JS
712 if (!ssh) ssh = "ssh";
713
714 *arg++ = ssh;
36ad53ff
EY
715 if (putty && !strcasestr(ssh, "tortoiseplink"))
716 *arg++ = "-batch";
f364cb88 717 if (port) {
36ad53ff
EY
718 /* P is for PuTTY, p is for OpenSSH */
719 *arg++ = putty ? "-P" : "-p";
f364cb88 720 *arg++ = port;
4852f723 721 }
f364cb88
JS
722 *arg++ = host;
723 }
724 else {
48a7c1c4
GB
725 /* remove repo-local variables from the environment */
726 conn->env = local_repo_env;
4cfb2a44 727 conn->use_shell = 1;
016fb48b 728 }
f364cb88
JS
729 *arg++ = cmd.buf;
730 *arg = NULL;
731
732 if (start_command(conn))
733 die("unable to fork");
734
735 fd[0] = conn->out; /* read from child's stdout */
736 fd[1] = conn->in; /* write to child's stdin */
737 strbuf_release(&cmd);
cabc3c12
JS
738 free(host);
739 free(port);
740 free(path);
98158e9c 741 return conn;
f7192598
LT
742}
743
7ffe853b
JK
744int git_connection_is_socket(struct child_process *conn)
745{
746 return conn == &no_fork;
747}
748
98158e9c 749int finish_connect(struct child_process *conn)
f7192598 750{
f364cb88 751 int code;
7ffe853b 752 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
753 return 0;
754
f364cb88
JS
755 code = finish_command(conn);
756 free(conn->argv);
98158e9c 757 free(conn);
f364cb88 758 return code;
f7192598 759}