parse_fetch: convert to use struct object_id
[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
46284dd1
HV
46static void die_initial_contact(int got_at_least_one_head)
47{
48 if (got_at_least_one_head)
49 die("The remote end hung up upon initial contact");
50 else
51 die("Could not read from remote repository.\n\n"
52 "Please make sure you have the correct access rights\n"
53 "and the repository exists.");
54}
55
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;
46284dd1
HV
118 int got_at_least_one_head = 0;
119
d1c133f5
LT
120 *list = NULL;
121 for (;;) {
122 struct ref *ref;
123 unsigned char old_sha1[20];
d1c133f5 124 char *name;
211b5f9e 125 int len, name_len;
74543a04 126 char *buffer = packet_buffer;
ae021d87 127 const char *arg;
d1c133f5 128
85edf4f5 129 len = packet_read(in, &src_buf, &src_len,
4981fe75 130 packet_buffer, sizeof(packet_buffer),
819b929d
JK
131 PACKET_READ_GENTLE_ON_EOF |
132 PACKET_READ_CHOMP_NEWLINE);
46284dd1
HV
133 if (len < 0)
134 die_initial_contact(got_at_least_one_head);
135
d1c133f5
LT
136 if (!len)
137 break;
d1c133f5 138
ae021d87
JK
139 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
140 die("remote error: %s", arg);
a8073289 141
ae021d87
JK
142 if (len == 48 && skip_prefix(buffer, "shallow ", &arg)) {
143 if (get_sha1_hex(arg, old_sha1))
144 die("protocol error: expected shallow sha-1, got '%s'", arg);
b06dcd7d
NTND
145 if (!shallow_points)
146 die("repository on the other end cannot be shallow");
147 sha1_array_append(shallow_points, old_sha1);
148 continue;
149 }
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
2ae7f90f 161 if (extra_have && !strcmp(name, ".have")) {
13eb4626 162 sha1_array_append(extra_have, old_sha1);
40c155ff
JH
163 continue;
164 }
165
be0b3f82 166 if (!check_ref(name, flags))
cfee10a7 167 continue;
59c69c0c 168 ref = alloc_ref(buffer + 41);
f4e54d02 169 hashcpy(ref->old_oid.hash, old_sha1);
d1c133f5
LT
170 *list = ref;
171 list = &ref->next;
46284dd1 172 got_at_least_one_head = 1;
d1c133f5 173 }
a45b5f05
JH
174
175 annotate_refs_with_symref_info(*orig_list);
176
d1c133f5
LT
177 return list;
178}
179
5d54cffc 180static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
f47182c8
JH
181{
182 int len;
183
184 if (!feature_list)
185 return NULL;
186
187 len = strlen(feature);
188 while (*feature_list) {
189 const char *found = strstr(feature_list, feature);
190 if (!found)
191 return NULL;
94427108
JK
192 if (feature_list == found || isspace(found[-1])) {
193 const char *value = found + len;
194 /* feature with no value (e.g., "thin-pack") */
195 if (!*value || isspace(*value)) {
196 if (lenp)
197 *lenp = 0;
198 return value;
199 }
200 /* feature with a value (e.g., "agent=git/1.2.3") */
201 else if (*value == '=') {
202 value++;
203 if (lenp)
204 *lenp = strcspn(value, " \t\n");
205 return value;
206 }
207 /*
208 * otherwise we matched a substring of another feature;
209 * keep looking
210 */
211 }
f47182c8
JH
212 feature_list = found + 1;
213 }
214 return NULL;
211b5f9e
JS
215}
216
94427108
JK
217int parse_feature_request(const char *feature_list, const char *feature)
218{
219 return !!parse_feature_value(feature_list, feature, NULL);
220}
221
222const char *server_feature_value(const char *feature, int *len)
223{
224 return parse_feature_value(server_capabilities, feature, len);
225}
226
227int server_supports(const char *feature)
228{
229 return !!server_feature_value(feature, NULL);
230}
231
2386d658
LT
232enum protocol {
233 PROTO_LOCAL = 1,
c59ab2e5 234 PROTO_FILE,
2386d658 235 PROTO_SSH,
4b05548f 236 PROTO_GIT
2386d658
LT
237};
238
c59ab2e5
TB
239int url_is_local_not_ssh(const char *url)
240{
241 const char *colon = strchr(url, ':');
242 const char *slash = strchr(url, '/');
243 return !colon || (slash && slash < colon) ||
244 has_dos_drive_prefix(url);
245}
246
5610b7c0
TB
247static const char *prot_name(enum protocol protocol)
248{
249 switch (protocol) {
250 case PROTO_LOCAL:
c59ab2e5 251 case PROTO_FILE:
5610b7c0
TB
252 return "file";
253 case PROTO_SSH:
254 return "ssh";
255 case PROTO_GIT:
256 return "git";
257 default:
83e6bda3 258 return "unknown protocol";
5610b7c0
TB
259 }
260}
261
2386d658
LT
262static enum protocol get_protocol(const char *name)
263{
264 if (!strcmp(name, "ssh"))
265 return PROTO_SSH;
266 if (!strcmp(name, "git"))
267 return PROTO_GIT;
c05186cc
LT
268 if (!strcmp(name, "git+ssh"))
269 return PROTO_SSH;
270 if (!strcmp(name, "ssh+git"))
271 return PROTO_SSH;
72a4f4b6 272 if (!strcmp(name, "file"))
c59ab2e5 273 return PROTO_FILE;
2386d658
LT
274 die("I don't handle protocol '%s'", name);
275}
276
86ceb337
TB
277static char *host_end(char **hoststart, int removebrackets)
278{
279 char *host = *hoststart;
280 char *end;
281 char *start = strstr(host, "@[");
282 if (start)
283 start++; /* Jump over '@' */
284 else
285 start = host;
286 if (start[0] == '[') {
287 end = strchr(start + 1, ']');
288 if (end) {
289 if (removebrackets) {
290 *end = 0;
291 memmove(start, start + 1, end - start);
292 end++;
293 }
294 } else
295 end = host;
296 } else
297 end = host;
298 return end;
299}
300
5ba88448
YH
301#define STR_(s) # s
302#define STR(s) STR_(s)
2386d658 303
72a534da
ML
304static void get_host_and_port(char **host, const char **port)
305{
306 char *colon, *end;
86ceb337 307 end = host_end(host, 1);
72a534da 308 colon = strchr(end, ':');
72a534da 309 if (colon) {
86ceb337
TB
310 long portnr = strtol(colon + 1, &end, 10);
311 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
312 *colon = 0;
313 *port = colon + 1;
6b6c5f7a
TB
314 } else if (!colon[1]) {
315 *colon = 0;
86ceb337 316 }
72a534da
ML
317 }
318}
319
e47a8583
EW
320static void enable_keepalive(int sockfd)
321{
322 int ka = 1;
323
324 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
325 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
326 strerror(errno));
327}
328
49744d63 329#ifndef NO_IPV6
4c505f71 330
ba505322
AR
331static const char *ai_name(const struct addrinfo *ai)
332{
785a9857
BK
333 static char addr[NI_MAXHOST];
334 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
335 NI_NUMERICHOST) != 0)
5096d490 336 xsnprintf(addr, sizeof(addr), "(unknown)");
785a9857 337
ba505322
AR
338 return addr;
339}
340
5ad312be
JL
341/*
342 * Returns a connected socket() fd, or else die()s.
343 */
7841ce79 344static int git_tcp_connect_sock(char *host, int flags)
2386d658 345{
63a995b6
DZ
346 struct strbuf error_message = STRBUF_INIT;
347 int sockfd = -1;
554fe20d 348 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
349 struct addrinfo hints, *ai0, *ai;
350 int gai;
ba505322 351 int cnt = 0;
5ba88448 352
72a534da
ML
353 get_host_and_port(&host, &port);
354 if (!*port)
355 port = "<none>";
5ba88448
YH
356
357 memset(&hints, 0, sizeof(hints));
358 hints.ai_socktype = SOCK_STREAM;
359 hints.ai_protocol = IPPROTO_TCP;
360
7841ce79
MT
361 if (flags & CONNECT_VERBOSE)
362 fprintf(stderr, "Looking up %s ... ", host);
363
5ba88448
YH
364 gai = getaddrinfo(host, port, &hints, &ai);
365 if (gai)
608d48b2 366 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 367
7841ce79
MT
368 if (flags & CONNECT_VERBOSE)
369 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
370
e08afecd 371 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
372 sockfd = socket(ai->ai_family,
373 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
374 if ((sockfd < 0) ||
375 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
376 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
377 host, cnt, ai_name(ai), strerror(errno));
378 if (0 <= sockfd)
379 close(sockfd);
5ba88448
YH
380 sockfd = -1;
381 continue;
2386d658 382 }
ba505322
AR
383 if (flags & CONNECT_VERBOSE)
384 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 385 break;
2386d658
LT
386 }
387
5ba88448 388 freeaddrinfo(ai0);
2386d658 389
2386d658 390 if (sockfd < 0)
63a995b6 391 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 392
e47a8583
EW
393 enable_keepalive(sockfd);
394
7841ce79
MT
395 if (flags & CONNECT_VERBOSE)
396 fprintf(stderr, "done.\n");
397
63a995b6
DZ
398 strbuf_release(&error_message);
399
5ad312be 400 return sockfd;
2386d658
LT
401}
402
49744d63 403#else /* NO_IPV6 */
4c505f71 404
5ad312be
JL
405/*
406 * Returns a connected socket() fd, or else die()s.
407 */
7841ce79 408static int git_tcp_connect_sock(char *host, int flags)
4c505f71 409{
7203a2d1
EFL
410 struct strbuf error_message = STRBUF_INIT;
411 int sockfd = -1;
72a534da
ML
412 const char *port = STR(DEFAULT_GIT_PORT);
413 char *ep;
4c505f71
PA
414 struct hostent *he;
415 struct sockaddr_in sa;
416 char **ap;
417 unsigned int nport;
ba505322 418 int cnt;
4c505f71 419
72a534da 420 get_host_and_port(&host, &port);
4c505f71 421
7841ce79
MT
422 if (flags & CONNECT_VERBOSE)
423 fprintf(stderr, "Looking up %s ... ", host);
424
4c505f71
PA
425 he = gethostbyname(host);
426 if (!he)
427 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
428 nport = strtoul(port, &ep, 10);
429 if ( ep == port || *ep ) {
430 /* Not numeric */
431 struct servent *se = getservbyname(port,"tcp");
432 if ( !se )
d7530708 433 die("Unknown port %s", port);
4c505f71
PA
434 nport = se->s_port;
435 }
436
7841ce79
MT
437 if (flags & CONNECT_VERBOSE)
438 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
439
ba505322 440 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
441 memset(&sa, 0, sizeof sa);
442 sa.sin_family = he->h_addrtype;
6573faff 443 sa.sin_port = htons(nport);
c6164218 444 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 445
7203a2d1
EFL
446 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
447 if ((sockfd < 0) ||
448 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
449 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
ba505322
AR
450 host,
451 cnt,
452 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
453 strerror(errno));
454 if (0 <= sockfd)
455 close(sockfd);
4c505f71
PA
456 sockfd = -1;
457 continue;
458 }
ba505322
AR
459 if (flags & CONNECT_VERBOSE)
460 fprintf(stderr, "%s ",
461 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
462 break;
463 }
464
465 if (sockfd < 0)
7203a2d1 466 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 467
e47a8583
EW
468 enable_keepalive(sockfd);
469
7841ce79
MT
470 if (flags & CONNECT_VERBOSE)
471 fprintf(stderr, "done.\n");
472
5ad312be
JL
473 return sockfd;
474}
475
476#endif /* NO_IPV6 */
477
478
7841ce79 479static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 480{
7841ce79 481 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 482
4c505f71 483 fd[0] = sockfd;
ec587fde 484 fd[1] = dup(sockfd);
4c505f71
PA
485}
486
4c505f71 487
96f1e58f 488static char *git_proxy_command;
f8014776 489
ef90d6d4
JS
490static int git_proxy_command_options(const char *var, const char *value,
491 void *cb)
f8014776 492{
e814bc4d 493 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
494 const char *for_pos;
495 int matchlen = -1;
496 int hostlen;
15112c95
EFL
497 const char *rhost_name = cb;
498 int rhost_len = strlen(rhost_name);
c3df8568 499
e814bc4d 500 if (git_proxy_command)
f8014776 501 return 0;
c64b9ad0
JH
502 if (!value)
503 return config_error_nonbool(var);
e814bc4d
JH
504 /* [core]
505 * ;# matches www.kernel.org as well
506 * gitproxy = netcatter-1 for kernel.org
507 * gitproxy = netcatter-2 for sample.xz
508 * gitproxy = netcatter-default
509 */
c3df8568 510 for_pos = strstr(value, " for ");
e814bc4d
JH
511 if (!for_pos)
512 /* matches everybody */
513 matchlen = strlen(value);
514 else {
515 hostlen = strlen(for_pos + 5);
516 if (rhost_len < hostlen)
517 matchlen = -1;
518 else if (!strncmp(for_pos + 5,
519 rhost_name + rhost_len - hostlen,
520 hostlen) &&
521 ((rhost_len == hostlen) ||
522 rhost_name[rhost_len - hostlen -1] == '.'))
523 matchlen = for_pos - value;
524 else
525 matchlen = -1;
526 }
527 if (0 <= matchlen) {
528 /* core.gitproxy = none for kernel.org */
a6080a0a 529 if (matchlen == 4 &&
e814bc4d
JH
530 !memcmp(value, "none", 4))
531 matchlen = 0;
182af834 532 git_proxy_command = xmemdupz(value, matchlen);
f8014776 533 }
e814bc4d 534 return 0;
f8014776
PC
535 }
536
ef90d6d4 537 return git_default_config(var, value, cb);
f8014776
PC
538}
539
e814bc4d 540static int git_use_proxy(const char *host)
f8014776
PC
541{
542 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 543 git_config(git_proxy_command_options, (void*)host);
e814bc4d 544 return (git_proxy_command && *git_proxy_command);
f8014776
PC
545}
546
5cbf8246 547static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 548{
554fe20d 549 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246 550 struct child_process *proxy;
f8014776 551
72a534da 552 get_host_and_port(&host, &port);
f8014776 553
483bbd4e
RS
554 proxy = xmalloc(sizeof(*proxy));
555 child_process_init(proxy);
1823bea1
JK
556 argv_array_push(&proxy->args, git_proxy_command);
557 argv_array_push(&proxy->args, host);
558 argv_array_push(&proxy->args, port);
5cbf8246
JK
559 proxy->in = -1;
560 proxy->out = -1;
561 if (start_command(proxy))
1823bea1 562 die("cannot start proxy %s", git_proxy_command);
5cbf8246
JK
563 fd[0] = proxy->out; /* read from proxy stdout */
564 fd[1] = proxy->in; /* write to proxy stdin */
565 return proxy;
f8014776
PC
566}
567
86ceb337 568static char *get_port(char *host)
2e776665
LT
569{
570 char *end;
86ceb337
TB
571 char *p = strchr(host, ':');
572
2e776665 573 if (p) {
8f148253
RS
574 long port = strtol(p + 1, &end, 10);
575 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
86ceb337
TB
576 *p = '\0';
577 return p+1;
2e776665
LT
578 }
579 }
580
581 return NULL;
582}
583
f7192598 584/*
cabc3c12
JS
585 * Extract protocol and relevant parts from the specified connection URL.
586 * The caller must free() the returned strings.
f7192598 587 */
cabc3c12 588static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
83b05875 589 char **ret_path)
f7192598 590{
9d2e9420 591 char *url;
8e76bf3f 592 char *host, *path;
356bece0 593 char *end;
c59ab2e5 594 int separator = '/';
faea9ccb 595 enum protocol protocol = PROTO_LOCAL;
f0b7367c 596
9d2e9420
JK
597 if (is_url(url_orig))
598 url = url_decode(url_orig);
599 else
600 url = xstrdup(url_orig);
601
faea9ccb 602 host = strstr(url, "://");
eeefa7c9 603 if (host) {
faea9ccb
AE
604 *host = '\0';
605 protocol = get_protocol(url);
606 host += 3;
356bece0 607 } else {
f7192598 608 host = url;
c59ab2e5
TB
609 if (!url_is_local_not_ssh(url)) {
610 protocol = PROTO_SSH;
611 separator = ':';
612 }
356bece0
YH
613 }
614
9aa5053d 615 /*
83b05875
TB
616 * Don't do destructive transforms as protocol code does
617 * '[]' unwrapping in get_host_and_port()
9aa5053d 618 */
86ceb337 619 end = host_end(&host, 0);
356bece0 620
c59ab2e5 621 if (protocol == PROTO_LOCAL)
72a4f4b6 622 path = end;
c59ab2e5
TB
623 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
624 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
625 else
626 path = strchr(end, separator);
2386d658 627
faea9ccb
AE
628 if (!path || !*path)
629 die("No path specified. See 'man git-pull' for valid url syntax");
630
631 /*
632 * null-terminate hostname and point path to ~ for URL's like this:
633 * ssh://host.xz/~user/repo
634 */
c59ab2e5
TB
635
636 end = path; /* Need to \0 terminate host here */
637 if (separator == ':')
638 path++; /* path starts after ':' */
639 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
faea9ccb
AE
640 if (path[1] == '~')
641 path++;
faea9ccb
AE
642 }
643
c59ab2e5
TB
644 path = xstrdup(path);
645 *end = '\0';
646
cabc3c12 647 *ret_host = xstrdup(host);
c59ab2e5 648 *ret_path = path;
cabc3c12
JS
649 free(url);
650 return protocol;
651}
652
d3180279 653static struct child_process no_fork = CHILD_PROCESS_INIT;
cabc3c12
JS
654
655/*
656 * This returns a dummy child_process if the transport protocol does not
657 * need fork(2), or a struct child_process object if it does. Once done,
658 * finish the connection with finish_connect() with the value returned from
659 * this function (it is safe to call finish_connect() with NULL to support
660 * the former case).
661 *
662 * If it returns, the connect is successful; it just dies on errors (this
663 * will hopefully be changed in a libification effort, to return NULL when
664 * the connection failed).
665 */
666struct child_process *git_connect(int fd[2], const char *url,
667 const char *prog, int flags)
668{
a2036d7e 669 char *hostandport, *path;
cabc3c12
JS
670 struct child_process *conn = &no_fork;
671 enum protocol protocol;
cabc3c12
JS
672 struct strbuf cmd = STRBUF_INIT;
673
674 /* Without this we cannot rely on waitpid() to tell
675 * what happened to our children.
2e776665 676 */
cabc3c12 677 signal(SIGCHLD, SIG_DFL);
2e776665 678
a2036d7e 679 protocol = parse_connect_url(url, &hostandport, &path);
3f55ccab 680 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
5610b7c0
TB
681 printf("Diag: url=%s\n", url ? url : "NULL");
682 printf("Diag: protocol=%s\n", prot_name(protocol));
a2036d7e 683 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
5610b7c0 684 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e
TB
685 conn = NULL;
686 } else if (protocol == PROTO_GIT) {
94bc83c5
JK
687 /*
688 * Set up virtual host information based on where we will
689 * connect, unless the user has overridden us in
690 * the environment.
691 */
692 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
693 if (target_host)
694 target_host = xstrdup(target_host);
695 else
696 target_host = xstrdup(hostandport);
697
a5adaced
JK
698 transport_check_allowed("git");
699
5ad312be
JL
700 /* These underlying connection commands die() if they
701 * cannot connect.
702 */
a2036d7e
TB
703 if (git_use_proxy(hostandport))
704 conn = git_proxy_connect(fd, hostandport);
da2a95b2 705 else
a2036d7e 706 git_tcp_connect(fd, hostandport, flags);
5ad312be
JL
707 /*
708 * Separate original protocol components prog and path
73bb33a9
SP
709 * from extended host header with a NUL byte.
710 *
711 * Note: Do not add any other headers here! Doing so
712 * will cause older git-daemon servers to crash.
5ad312be
JL
713 */
714 packet_write(fd[1],
715 "%s %s%chost=%s%c",
716 prog, path, 0,
717 target_host, 0);
718 free(target_host);
a2036d7e 719 } else {
483bbd4e
RS
720 conn = xmalloc(sizeof(*conn));
721 child_process_init(conn);
a2036d7e
TB
722
723 strbuf_addstr(&cmd, prog);
724 strbuf_addch(&cmd, ' ');
725 sq_quote_buf(&cmd, path);
726
aab40438
JK
727 /* remove repo-local variables from the environment */
728 conn->env = local_repo_env;
a48b409f 729 conn->use_shell = 1;
a2036d7e 730 conn->in = conn->out = -1;
a2036d7e 731 if (protocol == PROTO_SSH) {
39942766 732 const char *ssh;
a48b409f 733 int putty = 0, tortoiseplink = 0;
a2036d7e
TB
734 char *ssh_host = hostandport;
735 const char *port = NULL;
a5adaced 736 transport_check_allowed("ssh");
a2036d7e 737 get_host_and_port(&ssh_host, &port);
a2036d7e 738
86ceb337
TB
739 if (!port)
740 port = get_port(ssh_host);
42da4840 741
3f55ccab
TB
742 if (flags & CONNECT_DIAG_URL) {
743 printf("Diag: url=%s\n", url ? url : "NULL");
744 printf("Diag: protocol=%s\n", prot_name(protocol));
745 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
746 printf("Diag: port=%s\n", port ? port : "NONE");
747 printf("Diag: path=%s\n", path ? path : "NULL");
a2036d7e 748
3f55ccab
TB
749 free(hostandport);
750 free(path);
04f20c04 751 free(conn);
3f55ccab 752 return NULL;
37ee646e 753 }
754
755 ssh = getenv("GIT_SSH_COMMAND");
a48b409f 756 if (!ssh) {
baaf2337 757 const char *base;
758 char *ssh_dup;
759
a48b409f
JK
760 /*
761 * GIT_SSH is the no-shell version of
762 * GIT_SSH_COMMAND (and must remain so for
763 * historical compatibility).
764 */
765 conn->use_shell = 0;
766
37ee646e 767 ssh = getenv("GIT_SSH");
768 if (!ssh)
769 ssh = "ssh";
baaf2337 770
771 ssh_dup = xstrdup(ssh);
772 base = basename(ssh_dup);
773
774 tortoiseplink = !strcasecmp(base, "tortoiseplink") ||
775 !strcasecmp(base, "tortoiseplink.exe");
a48b409f
JK
776 putty = tortoiseplink ||
777 !strcasecmp(base, "plink") ||
778 !strcasecmp(base, "plink.exe");
baaf2337 779
780 free(ssh_dup);
37ee646e 781 }
782
783 argv_array_push(&conn->args, ssh);
baaf2337 784 if (tortoiseplink)
37ee646e 785 argv_array_push(&conn->args, "-batch");
786 if (port) {
787 /* P is for PuTTY, p is for OpenSSH */
788 argv_array_push(&conn->args, putty ? "-P" : "-p");
789 argv_array_push(&conn->args, port);
a2036d7e 790 }
37ee646e 791 argv_array_push(&conn->args, ssh_host);
c049b61d 792 } else {
a5adaced 793 transport_check_allowed("file");
4852f723 794 }
1823bea1 795 argv_array_push(&conn->args, cmd.buf);
f364cb88 796
a2036d7e
TB
797 if (start_command(conn))
798 die("unable to fork");
f364cb88 799
a2036d7e
TB
800 fd[0] = conn->out; /* read from child's stdout */
801 fd[1] = conn->in; /* write to child's stdin */
802 strbuf_release(&cmd);
803 }
804 free(hostandport);
cabc3c12 805 free(path);
98158e9c 806 return conn;
f7192598
LT
807}
808
7ffe853b
JK
809int git_connection_is_socket(struct child_process *conn)
810{
811 return conn == &no_fork;
812}
813
98158e9c 814int finish_connect(struct child_process *conn)
f7192598 815{
f364cb88 816 int code;
7ffe853b 817 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
818 return 0;
819
f364cb88 820 code = finish_command(conn);
98158e9c 821 free(conn);
f364cb88 822 return code;
f7192598 823}