Minor documentation fixup.
[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"
f7192598 6#include <sys/wait.h>
2386d658
LT
7#include <sys/socket.h>
8#include <netinet/in.h>
9#include <arpa/inet.h>
10#include <netdb.h>
e898081d 11#include <signal.h>
f7192598 12
1f5881bb 13static char *server_capabilities = NULL;
211b5f9e 14
d1c133f5
LT
15/*
16 * Read all the refs from the other end
17 */
1a7141ff
JH
18struct ref **get_remote_heads(int in, struct ref **list,
19 int nr_match, char **match, int ignore_funny)
d1c133f5
LT
20{
21 *list = NULL;
22 for (;;) {
23 struct ref *ref;
24 unsigned char old_sha1[20];
25 static char buffer[1000];
26 char *name;
211b5f9e 27 int len, name_len;
d1c133f5
LT
28
29 len = packet_read_line(in, buffer, sizeof(buffer));
30 if (!len)
31 break;
32 if (buffer[len-1] == '\n')
33 buffer[--len] = 0;
34
35 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
36 die("protocol error: expected sha/ref, got '%s'", buffer);
37 name = buffer + 41;
1a7141ff 38
211b5f9e
JS
39 name_len = strlen(name);
40 if (len != name_len + 41) {
41 if (server_capabilities)
42 free(server_capabilities);
43 server_capabilities = strdup(name + name_len + 1);
44 }
45
cfee10a7
JH
46 if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
47 check_ref_format(name + 5))
48 continue;
49
d1c133f5
LT
50 if (nr_match && !path_match(name, nr_match, match))
51 continue;
f88395ac 52 ref = xcalloc(1, sizeof(*ref) + len - 40);
d1c133f5 53 memcpy(ref->old_sha1, old_sha1, 20);
d1c133f5 54 memcpy(ref->name, buffer + 41, len - 40);
d1c133f5
LT
55 *list = ref;
56 list = &ref->next;
57 }
58 return list;
59}
60
211b5f9e
JS
61int server_supports(const char *feature)
62{
1f5881bb
JS
63 return server_capabilities &&
64 strstr(server_capabilities, feature) != NULL;
211b5f9e
JS
65}
66
41cb7488
LT
67int get_ack(int fd, unsigned char *result_sha1)
68{
69 static char line[1000];
70 int len = packet_read_line(fd, line, sizeof(line));
71
72 if (!len)
73 die("git-fetch-pack: expected ACK/NAK, got EOF");
74 if (line[len-1] == '\n')
75 line[--len] = 0;
76 if (!strcmp(line, "NAK"))
77 return 0;
da2a95b2 78 if (!strncmp(line, "ACK ", 4)) {
c4c86f07
JS
79 if (!get_sha1_hex(line+4, result_sha1)) {
80 if (strstr(line+45, "continue"))
81 return 2;
41cb7488 82 return 1;
c4c86f07 83 }
41cb7488
LT
84 }
85 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
86}
87
013e7c7f
LT
88int path_match(const char *path, int nr, char **match)
89{
90 int i;
91 int pathlen = strlen(path);
92
93 for (i = 0; i < nr; i++) {
94 char *s = match[i];
95 int len = strlen(s);
96
97 if (!len || len > pathlen)
98 continue;
99 if (memcmp(path + pathlen - len, s, len))
100 continue;
101 if (pathlen > len && path[pathlen - len - 1] != '/')
102 continue;
103 *s = 0;
9546010b 104 return (i + 1);
013e7c7f
LT
105 }
106 return 0;
107}
108
f88395ac
JH
109struct refspec {
110 char *src;
111 char *dst;
ff27adf3 112 char force;
f88395ac
JH
113};
114
ff27adf3
JH
115/*
116 * A:B means fast forward remote B with local A.
117 * +A:B means overwrite remote B with local A.
118 * +A is a shorthand for +A:A.
119 * A is a shorthand for A:A.
120 */
f88395ac
JH
121static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
122{
123 int i;
ff27adf3 124 struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
f88395ac
JH
125 for (i = 0; i < nr_refspec; i++) {
126 char *sp, *dp, *ep;
127 sp = refspec[i];
ff27adf3
JH
128 if (*sp == '+') {
129 rs[i].force = 1;
130 sp++;
131 }
f88395ac
JH
132 ep = strchr(sp, ':');
133 if (ep) {
134 dp = ep + 1;
135 *ep = 0;
136 }
137 else
138 dp = sp;
139 rs[i].src = sp;
140 rs[i].dst = dp;
141 }
142 rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
143 return rs;
144}
145
146static int count_refspec_match(const char *pattern,
147 struct ref *refs,
148 struct ref **matched_ref)
149{
150 int match;
151 int patlen = strlen(pattern);
152
153 for (match = 0; refs; refs = refs->next) {
154 char *name = refs->name;
155 int namelen = strlen(name);
156 if (namelen < patlen ||
157 memcmp(name + namelen - patlen, pattern, patlen))
158 continue;
159 if (namelen != patlen && name[namelen - patlen - 1] != '/')
160 continue;
161 match++;
162 *matched_ref = refs;
163 }
164 return match;
165}
166
167static void link_dst_tail(struct ref *ref, struct ref ***tail)
168{
169 **tail = ref;
170 *tail = &ref->next;
171 **tail = NULL;
172}
173
15e02b37
JH
174static struct ref *try_explicit_object_name(const char *name)
175{
176 unsigned char sha1[20];
177 struct ref *ref;
178 int len;
179 if (get_sha1(name, sha1))
180 return NULL;
181 len = strlen(name) + 1;
182 ref = xcalloc(1, sizeof(*ref) + len);
183 memcpy(ref->name, name, len);
184 memcpy(ref->new_sha1, sha1, 20);
185 return ref;
186}
187
f88395ac
JH
188static int match_explicit_refs(struct ref *src, struct ref *dst,
189 struct ref ***dst_tail, struct refspec *rs)
190{
191 int i, errs;
192 for (i = errs = 0; rs[i].src; i++) {
193 struct ref *matched_src, *matched_dst;
194
195 matched_src = matched_dst = NULL;
196 switch (count_refspec_match(rs[i].src, src, &matched_src)) {
197 case 1:
198 break;
199 case 0:
15e02b37
JH
200 /* The source could be in the get_sha1() format
201 * not a reference name.
202 */
203 matched_src = try_explicit_object_name(rs[i].src);
204 if (matched_src)
205 break;
f88395ac 206 errs = 1;
4ec99bf0
TS
207 error("src refspec %s does not match any.",
208 rs[i].src);
f88395ac
JH
209 break;
210 default:
211 errs = 1;
212 error("src refspec %s matches more than one.",
213 rs[i].src);
214 break;
215 }
216 switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
217 case 1:
218 break;
219 case 0:
220 if (!memcmp(rs[i].dst, "refs/", 5)) {
221 int len = strlen(rs[i].dst) + 1;
222 matched_dst = xcalloc(1, sizeof(*dst) + len);
223 memcpy(matched_dst->name, rs[i].dst, len);
224 link_dst_tail(matched_dst, dst_tail);
225 }
226 else if (!strcmp(rs[i].src, rs[i].dst) &&
227 matched_src) {
228 /* pushing "master:master" when
229 * remote does not have master yet.
230 */
4fa1604f 231 int len = strlen(matched_src->name) + 1;
f88395ac
JH
232 matched_dst = xcalloc(1, sizeof(*dst) + len);
233 memcpy(matched_dst->name, matched_src->name,
234 len);
235 link_dst_tail(matched_dst, dst_tail);
236 }
237 else {
238 errs = 1;
239 error("dst refspec %s does not match any "
240 "existing ref on the remote and does "
241 "not start with refs/.", rs[i].dst);
242 }
243 break;
244 default:
245 errs = 1;
246 error("dst refspec %s matches more than one.",
247 rs[i].dst);
248 break;
249 }
250 if (errs)
251 continue;
f88395ac
JH
252 if (matched_dst->peer_ref) {
253 errs = 1;
254 error("dst ref %s receives from more than one src.",
255 matched_dst->name);
256 }
ff27adf3 257 else {
f88395ac 258 matched_dst->peer_ref = matched_src;
ff27adf3
JH
259 matched_dst->force = rs[i].force;
260 }
f88395ac
JH
261 }
262 return -errs;
263}
264
265static struct ref *find_ref_by_name(struct ref *list, const char *name)
266{
267 for ( ; list; list = list->next)
268 if (!strcmp(list->name, name))
269 return list;
270 return NULL;
271}
272
273int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
274 int nr_refspec, char **refspec, int all)
275{
276 struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
277
278 if (nr_refspec)
279 return match_explicit_refs(src, dst, dst_tail, rs);
280
281 /* pick the remainder */
282 for ( ; src; src = src->next) {
283 struct ref *dst_peer;
284 if (src->peer_ref)
285 continue;
286 dst_peer = find_ref_by_name(dst, src->name);
635d37af 287 if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
f88395ac
JH
288 continue;
289 if (!dst_peer) {
f88395ac
JH
290 /* Create a new one and link it */
291 int len = strlen(src->name) + 1;
292 dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
293 memcpy(dst_peer->name, src->name, len);
294 memcpy(dst_peer->new_sha1, src->new_sha1, 20);
295 link_dst_tail(dst_peer, dst_tail);
296 }
297 dst_peer->peer_ref = src;
298 }
299 return 0;
300}
301
2386d658
LT
302enum protocol {
303 PROTO_LOCAL = 1,
304 PROTO_SSH,
305 PROTO_GIT,
306};
307
308static enum protocol get_protocol(const char *name)
309{
310 if (!strcmp(name, "ssh"))
311 return PROTO_SSH;
312 if (!strcmp(name, "git"))
313 return PROTO_GIT;
c05186cc
LT
314 if (!strcmp(name, "git+ssh"))
315 return PROTO_SSH;
316 if (!strcmp(name, "ssh+git"))
317 return PROTO_SSH;
2386d658
LT
318 die("I don't handle protocol '%s'", name);
319}
320
5ba88448
YH
321#define STR_(s) # s
322#define STR(s) STR_(s)
2386d658 323
49744d63 324#ifndef NO_IPV6
4c505f71 325
5ad312be
JL
326/*
327 * Returns a connected socket() fd, or else die()s.
328 */
329static int git_tcp_connect_sock(char *host)
2386d658 330{
5ba88448
YH
331 int sockfd = -1;
332 char *colon, *end;
554fe20d 333 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
334 struct addrinfo hints, *ai0, *ai;
335 int gai;
336
337 if (host[0] == '[') {
338 end = strchr(host + 1, ']');
339 if (end) {
340 *end = 0;
341 end++;
342 host++;
343 } else
344 end = host;
345 } else
346 end = host;
347 colon = strchr(end, ':');
348
ce6f8e7e
LT
349 if (colon) {
350 *colon = 0;
5ba88448 351 port = colon + 1;
ce6f8e7e 352 }
5ba88448
YH
353
354 memset(&hints, 0, sizeof(hints));
355 hints.ai_socktype = SOCK_STREAM;
356 hints.ai_protocol = IPPROTO_TCP;
357
358 gai = getaddrinfo(host, port, &hints, &ai);
359 if (gai)
360 die("Unable to look up %s (%s)", host, gai_strerror(gai));
361
362 for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be
JL
363 sockfd = socket(ai->ai_family,
364 ai->ai_socktype, ai->ai_protocol);
5ba88448
YH
365 if (sockfd < 0)
366 continue;
367 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
368 close(sockfd);
369 sockfd = -1;
370 continue;
2386d658 371 }
5ba88448 372 break;
2386d658
LT
373 }
374
5ba88448 375 freeaddrinfo(ai0);
2386d658 376
2386d658 377 if (sockfd < 0)
5ba88448
YH
378 die("unable to connect a socket (%s)", strerror(errno));
379
5ad312be 380 return sockfd;
2386d658
LT
381}
382
49744d63 383#else /* NO_IPV6 */
4c505f71 384
5ad312be
JL
385/*
386 * Returns a connected socket() fd, or else die()s.
387 */
388static int git_tcp_connect_sock(char *host)
4c505f71
PA
389{
390 int sockfd = -1;
391 char *colon, *end;
392 char *port = STR(DEFAULT_GIT_PORT), *ep;
393 struct hostent *he;
394 struct sockaddr_in sa;
395 char **ap;
396 unsigned int nport;
397
398 if (host[0] == '[') {
399 end = strchr(host + 1, ']');
400 if (end) {
401 *end = 0;
402 end++;
403 host++;
404 } else
405 end = host;
406 } else
407 end = host;
408 colon = strchr(end, ':');
409
410 if (colon) {
411 *colon = 0;
412 port = colon + 1;
413 }
414
4c505f71
PA
415 he = gethostbyname(host);
416 if (!he)
417 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
418 nport = strtoul(port, &ep, 10);
419 if ( ep == port || *ep ) {
420 /* Not numeric */
421 struct servent *se = getservbyname(port,"tcp");
422 if ( !se )
423 die("Unknown port %s\n", port);
424 nport = se->s_port;
425 }
426
427 for (ap = he->h_addr_list; *ap; ap++) {
428 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
429 if (sockfd < 0)
430 continue;
431
432 memset(&sa, 0, sizeof sa);
433 sa.sin_family = he->h_addrtype;
6573faff 434 sa.sin_port = htons(nport);
c6164218 435 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71
PA
436
437 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
438 close(sockfd);
439 sockfd = -1;
440 continue;
441 }
442 break;
443 }
444
445 if (sockfd < 0)
446 die("unable to connect a socket (%s)", strerror(errno));
447
5ad312be
JL
448 return sockfd;
449}
450
451#endif /* NO_IPV6 */
452
453
c78963d2 454static void git_tcp_connect(int fd[2], char *host)
5ad312be
JL
455{
456 int sockfd = git_tcp_connect_sock(host);
457
4c505f71
PA
458 fd[0] = sockfd;
459 fd[1] = sockfd;
4c505f71
PA
460}
461
4c505f71 462
f8014776 463static char *git_proxy_command = NULL;
e814bc4d
JH
464static const char *rhost_name = NULL;
465static int rhost_len;
f8014776
PC
466
467static int git_proxy_command_options(const char *var, const char *value)
468{
e814bc4d 469 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
470 const char *for_pos;
471 int matchlen = -1;
472 int hostlen;
473
e814bc4d 474 if (git_proxy_command)
f8014776 475 return 0;
e814bc4d
JH
476 /* [core]
477 * ;# matches www.kernel.org as well
478 * gitproxy = netcatter-1 for kernel.org
479 * gitproxy = netcatter-2 for sample.xz
480 * gitproxy = netcatter-default
481 */
c3df8568 482 for_pos = strstr(value, " for ");
e814bc4d
JH
483 if (!for_pos)
484 /* matches everybody */
485 matchlen = strlen(value);
486 else {
487 hostlen = strlen(for_pos + 5);
488 if (rhost_len < hostlen)
489 matchlen = -1;
490 else if (!strncmp(for_pos + 5,
491 rhost_name + rhost_len - hostlen,
492 hostlen) &&
493 ((rhost_len == hostlen) ||
494 rhost_name[rhost_len - hostlen -1] == '.'))
495 matchlen = for_pos - value;
496 else
497 matchlen = -1;
498 }
499 if (0 <= matchlen) {
500 /* core.gitproxy = none for kernel.org */
501 if (matchlen == 4 &&
502 !memcmp(value, "none", 4))
503 matchlen = 0;
504 git_proxy_command = xmalloc(matchlen + 1);
505 memcpy(git_proxy_command, value, matchlen);
506 git_proxy_command[matchlen] = 0;
f8014776 507 }
e814bc4d 508 return 0;
f8014776
PC
509 }
510
511 return git_default_config(var, value);
512}
513
e814bc4d 514static int git_use_proxy(const char *host)
f8014776 515{
e814bc4d
JH
516 rhost_name = host;
517 rhost_len = strlen(host);
f8014776
PC
518 git_proxy_command = getenv("GIT_PROXY_COMMAND");
519 git_config(git_proxy_command_options);
e814bc4d
JH
520 rhost_name = NULL;
521 return (git_proxy_command && *git_proxy_command);
f8014776
PC
522}
523
c78963d2 524static void git_proxy_connect(int fd[2], char *host)
f8014776 525{
554fe20d 526 const char *port = STR(DEFAULT_GIT_PORT);
f8014776
PC
527 char *colon, *end;
528 int pipefd[2][2];
529 pid_t pid;
530
531 if (host[0] == '[') {
532 end = strchr(host + 1, ']');
533 if (end) {
534 *end = 0;
535 end++;
536 host++;
537 } else
538 end = host;
539 } else
540 end = host;
541 colon = strchr(end, ':');
542
543 if (colon) {
544 *colon = 0;
545 port = colon + 1;
546 }
547
548 if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
549 die("unable to create pipe pair for communication");
550 pid = fork();
551 if (!pid) {
552 dup2(pipefd[1][0], 0);
553 dup2(pipefd[0][1], 1);
554 close(pipefd[0][0]);
555 close(pipefd[0][1]);
556 close(pipefd[1][0]);
557 close(pipefd[1][1]);
558 execlp(git_proxy_command, git_proxy_command, host, port, NULL);
559 die("exec failed");
560 }
5ad312be
JL
561 if (pid < 0)
562 die("fork failed");
f8014776
PC
563 fd[0] = pipefd[0][0];
564 fd[1] = pipefd[1][1];
565 close(pipefd[0][1]);
566 close(pipefd[1][0]);
f8014776
PC
567}
568
f7192598
LT
569/*
570 * Yeah, yeah, fixme. Need to pass in the heads etc.
571 */
572int git_connect(int fd[2], char *url, const char *prog)
573{
574 char command[1024];
faea9ccb 575 char *host, *path = url;
356bece0
YH
576 char *end;
577 int c;
f7192598
LT
578 int pipefd[2][2];
579 pid_t pid;
faea9ccb 580 enum protocol protocol = PROTO_LOCAL;
da2a95b2 581 int free_path = 0;
faea9ccb 582
f0b7367c
JH
583 /* Without this we cannot rely on waitpid() to tell
584 * what happened to our children.
585 */
586 signal(SIGCHLD, SIG_DFL);
587
faea9ccb
AE
588 host = strstr(url, "://");
589 if(host) {
590 *host = '\0';
591 protocol = get_protocol(url);
592 host += 3;
356bece0
YH
593 c = '/';
594 } else {
f7192598 595 host = url;
356bece0
YH
596 c = ':';
597 }
598
599 if (host[0] == '[') {
600 end = strchr(host + 1, ']');
601 if (end) {
602 *end = 0;
603 end++;
604 host++;
605 } else
606 end = host;
607 } else
608 end = host;
609
610 path = strchr(end, c);
611 if (c == ':') {
612 if (path) {
faea9ccb 613 protocol = PROTO_SSH;
356bece0
YH
614 *path++ = '\0';
615 } else
616 path = host;
f7192598 617 }
2386d658 618
faea9ccb
AE
619 if (!path || !*path)
620 die("No path specified. See 'man git-pull' for valid url syntax");
621
622 /*
623 * null-terminate hostname and point path to ~ for URL's like this:
624 * ssh://host.xz/~user/repo
625 */
626 if (protocol != PROTO_LOCAL && host != url) {
627 char *ptr = path;
628 if (path[1] == '~')
629 path++;
da2a95b2 630 else {
faea9ccb 631 path = strdup(ptr);
da2a95b2
SH
632 free_path = 1;
633 }
faea9ccb
AE
634
635 *ptr = '\0';
636 }
637
f8014776 638 if (protocol == PROTO_GIT) {
5ad312be
JL
639 /* These underlying connection commands die() if they
640 * cannot connect.
641 */
642 char *target_host = strdup(host);
e814bc4d 643 if (git_use_proxy(host))
c78963d2 644 git_proxy_connect(fd, host);
da2a95b2 645 else
c78963d2 646 git_tcp_connect(fd, host);
5ad312be
JL
647 /*
648 * Separate original protocol components prog and path
649 * from extended components with a NUL byte.
650 */
651 packet_write(fd[1],
652 "%s %s%chost=%s%c",
653 prog, path, 0,
654 target_host, 0);
655 free(target_host);
da2a95b2
SH
656 if (free_path)
657 free(path);
5ad312be 658 return 0;
f8014776 659 }
2386d658 660
f7192598
LT
661 if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
662 die("unable to create pipe pair for communication");
663 pid = fork();
c9bc159d
PD
664 if (pid < 0)
665 die("unable to fork");
f7192598 666 if (!pid) {
b10d0ec7
JH
667 snprintf(command, sizeof(command), "%s %s", prog,
668 sq_quote(path));
f7192598
LT
669 dup2(pipefd[1][0], 0);
670 dup2(pipefd[0][1], 1);
671 close(pipefd[0][0]);
672 close(pipefd[0][1]);
673 close(pipefd[1][0]);
674 close(pipefd[1][1]);
4852f723 675 if (protocol == PROTO_SSH) {
c7c81b3a
JR
676 const char *ssh, *ssh_basename;
677 ssh = getenv("GIT_SSH");
678 if (!ssh) ssh = "ssh";
679 ssh_basename = strrchr(ssh, '/');
4852f723
MS
680 if (!ssh_basename)
681 ssh_basename = ssh;
682 else
683 ssh_basename++;
684 execlp(ssh, ssh_basename, host, command, NULL);
685 }
016fb48b
MD
686 else {
687 unsetenv(ALTERNATE_DB_ENVIRONMENT);
688 unsetenv(DB_ENVIRONMENT);
689 unsetenv(GIT_DIR_ENVIRONMENT);
690 unsetenv(GRAFT_ENVIRONMENT);
691 unsetenv(INDEX_ENVIRONMENT);
f7192598 692 execlp("sh", "sh", "-c", command, NULL);
016fb48b 693 }
f7192598 694 die("exec failed");
016fb48b 695 }
f7192598
LT
696 fd[0] = pipefd[0][0];
697 fd[1] = pipefd[1][1];
698 close(pipefd[0][1]);
699 close(pipefd[1][0]);
da2a95b2
SH
700 if (free_path)
701 free(path);
f7192598
LT
702 return pid;
703}
704
705int finish_connect(pid_t pid)
706{
707 int ret;
708
709 for (;;) {
710 ret = waitpid(pid, NULL, 0);
711 if (!ret)
712 break;
713 if (errno != EINTR)
714 break;
715 }
716 return ret;
717}