Git 1.7.9-rc0
[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"
9d2e9420 8#include "url.h"
f7192598 9
96f1e58f 10static char *server_capabilities;
211b5f9e 11
2718ff09
LT
12static int check_ref(const char *name, int len, unsigned int flags)
13{
14 if (!flags)
15 return 1;
16
c41e20b3 17 if (len < 5 || memcmp(name, "refs/", 5))
2718ff09
LT
18 return 0;
19
20 /* Skip the "refs/" part */
21 name += 5;
22 len -= 5;
23
24 /* REF_NORMAL means that we don't want the magic fake tag refs */
8d9c5010 25 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
2718ff09
LT
26 return 0;
27
28 /* REF_HEADS means that we want regular branch heads */
29 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
30 return 1;
31
32 /* REF_TAGS means that we want tags */
33 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
34 return 1;
35
36 /* All type bits clear means that we are ok with anything */
37 return !(flags & ~REF_NORMAL);
38}
39
4577370e
DB
40int check_ref_type(const struct ref *ref, int flags)
41{
42 return check_ref(ref->name, strlen(ref->name), flags);
43}
44
40c155ff
JH
45static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
46{
47 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
48 hashcpy(&(extra->array[extra->nr][0]), sha1);
49 extra->nr++;
50}
51
d1c133f5
LT
52/*
53 * Read all the refs from the other end
54 */
1a7141ff 55struct ref **get_remote_heads(int in, struct ref **list,
40c155ff
JH
56 unsigned int flags,
57 struct extra_have_objects *extra_have)
d1c133f5
LT
58{
59 *list = NULL;
60 for (;;) {
61 struct ref *ref;
62 unsigned char old_sha1[20];
63 static char buffer[1000];
64 char *name;
211b5f9e 65 int len, name_len;
d1c133f5
LT
66
67 len = packet_read_line(in, buffer, sizeof(buffer));
68 if (!len)
69 break;
70 if (buffer[len-1] == '\n')
71 buffer[--len] = 0;
72
a8073289
TPW
73 if (len > 4 && !prefixcmp(buffer, "ERR "))
74 die("remote error: %s", buffer + 4);
75
d1c133f5
LT
76 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
77 die("protocol error: expected sha/ref, got '%s'", buffer);
78 name = buffer + 41;
1a7141ff 79
211b5f9e
JS
80 name_len = strlen(name);
81 if (len != name_len + 41) {
8e0f7003 82 free(server_capabilities);
9befac47 83 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
84 }
85
40c155ff
JH
86 if (extra_have &&
87 name_len == 5 && !memcmp(".have", name, 5)) {
88 add_extra_have(extra_have, old_sha1);
89 continue;
90 }
91
2718ff09 92 if (!check_ref(name, name_len, flags))
cfee10a7 93 continue;
59c69c0c 94 ref = alloc_ref(buffer + 41);
e702496e 95 hashcpy(ref->old_sha1, old_sha1);
d1c133f5
LT
96 *list = ref;
97 list = &ref->next;
98 }
99 return list;
100}
101
211b5f9e
JS
102int server_supports(const char *feature)
103{
1f5881bb
JS
104 return server_capabilities &&
105 strstr(server_capabilities, feature) != NULL;
211b5f9e
JS
106}
107
2386d658
LT
108enum protocol {
109 PROTO_LOCAL = 1,
110 PROTO_SSH,
4b05548f 111 PROTO_GIT
2386d658
LT
112};
113
114static enum protocol get_protocol(const char *name)
115{
116 if (!strcmp(name, "ssh"))
117 return PROTO_SSH;
118 if (!strcmp(name, "git"))
119 return PROTO_GIT;
c05186cc
LT
120 if (!strcmp(name, "git+ssh"))
121 return PROTO_SSH;
122 if (!strcmp(name, "ssh+git"))
123 return PROTO_SSH;
72a4f4b6
LT
124 if (!strcmp(name, "file"))
125 return PROTO_LOCAL;
2386d658
LT
126 die("I don't handle protocol '%s'", name);
127}
128
5ba88448
YH
129#define STR_(s) # s
130#define STR(s) STR_(s)
2386d658 131
72a534da
ML
132static void get_host_and_port(char **host, const char **port)
133{
134 char *colon, *end;
135
136 if (*host[0] == '[') {
137 end = strchr(*host + 1, ']');
138 if (end) {
139 *end = 0;
140 end++;
141 (*host)++;
142 } else
143 end = *host;
144 } else
145 end = *host;
146 colon = strchr(end, ':');
147
148 if (colon) {
149 *colon = 0;
150 *port = colon + 1;
151 }
152}
153
e47a8583
EW
154static void enable_keepalive(int sockfd)
155{
156 int ka = 1;
157
158 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
159 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
160 strerror(errno));
161}
162
49744d63 163#ifndef NO_IPV6
4c505f71 164
ba505322
AR
165static const char *ai_name(const struct addrinfo *ai)
166{
785a9857
BK
167 static char addr[NI_MAXHOST];
168 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
169 NI_NUMERICHOST) != 0)
ba505322 170 strcpy(addr, "(unknown)");
785a9857 171
ba505322
AR
172 return addr;
173}
174
5ad312be
JL
175/*
176 * Returns a connected socket() fd, or else die()s.
177 */
7841ce79 178static int git_tcp_connect_sock(char *host, int flags)
2386d658 179{
63a995b6
DZ
180 struct strbuf error_message = STRBUF_INIT;
181 int sockfd = -1;
554fe20d 182 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
183 struct addrinfo hints, *ai0, *ai;
184 int gai;
ba505322 185 int cnt = 0;
5ba88448 186
72a534da
ML
187 get_host_and_port(&host, &port);
188 if (!*port)
189 port = "<none>";
5ba88448
YH
190
191 memset(&hints, 0, sizeof(hints));
192 hints.ai_socktype = SOCK_STREAM;
193 hints.ai_protocol = IPPROTO_TCP;
194
7841ce79
MT
195 if (flags & CONNECT_VERBOSE)
196 fprintf(stderr, "Looking up %s ... ", host);
197
5ba88448
YH
198 gai = getaddrinfo(host, port, &hints, &ai);
199 if (gai)
608d48b2 200 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 201
7841ce79
MT
202 if (flags & CONNECT_VERBOSE)
203 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
204
e08afecd 205 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
206 sockfd = socket(ai->ai_family,
207 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
208 if ((sockfd < 0) ||
209 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
210 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
211 host, cnt, ai_name(ai), strerror(errno));
212 if (0 <= sockfd)
213 close(sockfd);
5ba88448
YH
214 sockfd = -1;
215 continue;
2386d658 216 }
ba505322
AR
217 if (flags & CONNECT_VERBOSE)
218 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 219 break;
2386d658
LT
220 }
221
5ba88448 222 freeaddrinfo(ai0);
2386d658 223
2386d658 224 if (sockfd < 0)
63a995b6 225 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 226
e47a8583
EW
227 enable_keepalive(sockfd);
228
7841ce79
MT
229 if (flags & CONNECT_VERBOSE)
230 fprintf(stderr, "done.\n");
231
63a995b6
DZ
232 strbuf_release(&error_message);
233
5ad312be 234 return sockfd;
2386d658
LT
235}
236
49744d63 237#else /* NO_IPV6 */
4c505f71 238
5ad312be
JL
239/*
240 * Returns a connected socket() fd, or else die()s.
241 */
7841ce79 242static int git_tcp_connect_sock(char *host, int flags)
4c505f71 243{
7203a2d1
EFL
244 struct strbuf error_message = STRBUF_INIT;
245 int sockfd = -1;
72a534da
ML
246 const char *port = STR(DEFAULT_GIT_PORT);
247 char *ep;
4c505f71
PA
248 struct hostent *he;
249 struct sockaddr_in sa;
250 char **ap;
251 unsigned int nport;
ba505322 252 int cnt;
4c505f71 253
72a534da 254 get_host_and_port(&host, &port);
4c505f71 255
7841ce79
MT
256 if (flags & CONNECT_VERBOSE)
257 fprintf(stderr, "Looking up %s ... ", host);
258
4c505f71
PA
259 he = gethostbyname(host);
260 if (!he)
261 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
262 nport = strtoul(port, &ep, 10);
263 if ( ep == port || *ep ) {
264 /* Not numeric */
265 struct servent *se = getservbyname(port,"tcp");
266 if ( !se )
d7530708 267 die("Unknown port %s", port);
4c505f71
PA
268 nport = se->s_port;
269 }
270
7841ce79
MT
271 if (flags & CONNECT_VERBOSE)
272 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
273
ba505322 274 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
275 memset(&sa, 0, sizeof sa);
276 sa.sin_family = he->h_addrtype;
6573faff 277 sa.sin_port = htons(nport);
c6164218 278 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 279
7203a2d1
EFL
280 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
281 if ((sockfd < 0) ||
282 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
283 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
ba505322
AR
284 host,
285 cnt,
286 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
287 strerror(errno));
288 if (0 <= sockfd)
289 close(sockfd);
4c505f71
PA
290 sockfd = -1;
291 continue;
292 }
ba505322
AR
293 if (flags & CONNECT_VERBOSE)
294 fprintf(stderr, "%s ",
295 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
296 break;
297 }
298
299 if (sockfd < 0)
7203a2d1 300 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 301
e47a8583
EW
302 enable_keepalive(sockfd);
303
7841ce79
MT
304 if (flags & CONNECT_VERBOSE)
305 fprintf(stderr, "done.\n");
306
5ad312be
JL
307 return sockfd;
308}
309
310#endif /* NO_IPV6 */
311
312
7841ce79 313static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 314{
7841ce79 315 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 316
4c505f71 317 fd[0] = sockfd;
ec587fde 318 fd[1] = dup(sockfd);
4c505f71
PA
319}
320
4c505f71 321
96f1e58f 322static char *git_proxy_command;
f8014776 323
ef90d6d4
JS
324static int git_proxy_command_options(const char *var, const char *value,
325 void *cb)
f8014776 326{
e814bc4d 327 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
328 const char *for_pos;
329 int matchlen = -1;
330 int hostlen;
15112c95
EFL
331 const char *rhost_name = cb;
332 int rhost_len = strlen(rhost_name);
c3df8568 333
e814bc4d 334 if (git_proxy_command)
f8014776 335 return 0;
c64b9ad0
JH
336 if (!value)
337 return config_error_nonbool(var);
e814bc4d
JH
338 /* [core]
339 * ;# matches www.kernel.org as well
340 * gitproxy = netcatter-1 for kernel.org
341 * gitproxy = netcatter-2 for sample.xz
342 * gitproxy = netcatter-default
343 */
c3df8568 344 for_pos = strstr(value, " for ");
e814bc4d
JH
345 if (!for_pos)
346 /* matches everybody */
347 matchlen = strlen(value);
348 else {
349 hostlen = strlen(for_pos + 5);
350 if (rhost_len < hostlen)
351 matchlen = -1;
352 else if (!strncmp(for_pos + 5,
353 rhost_name + rhost_len - hostlen,
354 hostlen) &&
355 ((rhost_len == hostlen) ||
356 rhost_name[rhost_len - hostlen -1] == '.'))
357 matchlen = for_pos - value;
358 else
359 matchlen = -1;
360 }
361 if (0 <= matchlen) {
362 /* core.gitproxy = none for kernel.org */
a6080a0a 363 if (matchlen == 4 &&
e814bc4d
JH
364 !memcmp(value, "none", 4))
365 matchlen = 0;
182af834 366 git_proxy_command = xmemdupz(value, matchlen);
f8014776 367 }
e814bc4d 368 return 0;
f8014776
PC
369 }
370
ef90d6d4 371 return git_default_config(var, value, cb);
f8014776
PC
372}
373
e814bc4d 374static int git_use_proxy(const char *host)
f8014776
PC
375{
376 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 377 git_config(git_proxy_command_options, (void*)host);
e814bc4d 378 return (git_proxy_command && *git_proxy_command);
f8014776
PC
379}
380
5cbf8246 381static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 382{
554fe20d 383 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246
JK
384 const char **argv;
385 struct child_process *proxy;
f8014776 386
72a534da 387 get_host_and_port(&host, &port);
f8014776 388
5cbf8246 389 argv = xmalloc(sizeof(*argv) * 4);
15a1c012
SP
390 argv[0] = git_proxy_command;
391 argv[1] = host;
392 argv[2] = port;
393 argv[3] = NULL;
5cbf8246
JK
394 proxy = xcalloc(1, sizeof(*proxy));
395 proxy->argv = argv;
396 proxy->in = -1;
397 proxy->out = -1;
398 if (start_command(proxy))
15a1c012 399 die("cannot start proxy %s", argv[0]);
5cbf8246
JK
400 fd[0] = proxy->out; /* read from proxy stdout */
401 fd[1] = proxy->in; /* write to proxy stdin */
402 return proxy;
f8014776
PC
403}
404
0f503d77
CC
405#define MAX_CMD_LEN 1024
406
2af202be 407static char *get_port(char *host)
2e776665
LT
408{
409 char *end;
410 char *p = strchr(host, ':');
411
412 if (p) {
8f148253
RS
413 long port = strtol(p + 1, &end, 10);
414 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
2e776665
LT
415 *p = '\0';
416 return p+1;
417 }
418 }
419
420 return NULL;
421}
422
fb32c917
JS
423static struct child_process no_fork;
424
f7192598 425/*
fb32c917
JS
426 * This returns a dummy child_process if the transport protocol does not
427 * need fork(2), or a struct child_process object if it does. Once done,
428 * finish the connection with finish_connect() with the value returned from
429 * this function (it is safe to call finish_connect() with NULL to support
430 * the former case).
f42a5c4e 431 *
fb32c917
JS
432 * If it returns, the connect is successful; it just dies on errors (this
433 * will hopefully be changed in a libification effort, to return NULL when
434 * the connection failed).
f7192598 435 */
4577370e 436struct child_process *git_connect(int fd[2], const char *url_orig,
98158e9c 437 const char *prog, int flags)
f7192598 438{
9d2e9420 439 char *url;
8e76bf3f 440 char *host, *path;
356bece0
YH
441 char *end;
442 int c;
5cbf8246 443 struct child_process *conn = &no_fork;
faea9ccb 444 enum protocol protocol = PROTO_LOCAL;
da2a95b2 445 int free_path = 0;
2e776665 446 char *port = NULL;
f364cb88
JS
447 const char **arg;
448 struct strbuf cmd;
faea9ccb 449
f0b7367c
JH
450 /* Without this we cannot rely on waitpid() to tell
451 * what happened to our children.
452 */
453 signal(SIGCHLD, SIG_DFL);
454
9d2e9420
JK
455 if (is_url(url_orig))
456 url = url_decode(url_orig);
457 else
458 url = xstrdup(url_orig);
459
faea9ccb 460 host = strstr(url, "://");
eeefa7c9 461 if (host) {
faea9ccb
AE
462 *host = '\0';
463 protocol = get_protocol(url);
464 host += 3;
356bece0
YH
465 c = '/';
466 } else {
f7192598 467 host = url;
356bece0
YH
468 c = ':';
469 }
470
9aa5053d
IL
471 /*
472 * Don't do destructive transforms with git:// as that
9517e6b8 473 * protocol code does '[]' unwrapping of its own.
9aa5053d 474 */
356bece0
YH
475 if (host[0] == '[') {
476 end = strchr(host + 1, ']');
477 if (end) {
9aa5053d
IL
478 if (protocol != PROTO_GIT) {
479 *end = 0;
480 host++;
481 }
356bece0 482 end++;
356bece0
YH
483 } else
484 end = host;
485 } else
486 end = host;
487
488 path = strchr(end, c);
be501813 489 if (path && !has_dos_drive_prefix(end)) {
72a4f4b6 490 if (c == ':') {
faea9ccb 491 protocol = PROTO_SSH;
356bece0 492 *path++ = '\0';
72a4f4b6
LT
493 }
494 } else
495 path = end;
2386d658 496
faea9ccb
AE
497 if (!path || !*path)
498 die("No path specified. See 'man git-pull' for valid url syntax");
499
500 /*
501 * null-terminate hostname and point path to ~ for URL's like this:
502 * ssh://host.xz/~user/repo
503 */
504 if (protocol != PROTO_LOCAL && host != url) {
505 char *ptr = path;
506 if (path[1] == '~')
507 path++;
da2a95b2 508 else {
9befac47 509 path = xstrdup(ptr);
da2a95b2
SH
510 free_path = 1;
511 }
faea9ccb
AE
512
513 *ptr = '\0';
514 }
515
2e776665
LT
516 /*
517 * Add support for ssh port: ssh://host.xy:<port>/...
518 */
519 if (protocol == PROTO_SSH && host != url)
520 port = get_port(host);
521
f8014776 522 if (protocol == PROTO_GIT) {
5ad312be
JL
523 /* These underlying connection commands die() if they
524 * cannot connect.
525 */
9befac47 526 char *target_host = xstrdup(host);
e814bc4d 527 if (git_use_proxy(host))
5cbf8246 528 conn = git_proxy_connect(fd, host);
da2a95b2 529 else
7841ce79 530 git_tcp_connect(fd, host, flags);
5ad312be
JL
531 /*
532 * Separate original protocol components prog and path
73bb33a9
SP
533 * from extended host header with a NUL byte.
534 *
535 * Note: Do not add any other headers here! Doing so
536 * will cause older git-daemon servers to crash.
5ad312be
JL
537 */
538 packet_write(fd[1],
539 "%s %s%chost=%s%c",
540 prog, path, 0,
541 target_host, 0);
542 free(target_host);
4577370e 543 free(url);
da2a95b2
SH
544 if (free_path)
545 free(path);
5cbf8246 546 return conn;
f8014776 547 }
2386d658 548
98158e9c 549 conn = xcalloc(1, sizeof(*conn));
2e776665 550
f364cb88
JS
551 strbuf_init(&cmd, MAX_CMD_LEN);
552 strbuf_addstr(&cmd, prog);
553 strbuf_addch(&cmd, ' ');
554 sq_quote_buf(&cmd, path);
555 if (cmd.len >= MAX_CMD_LEN)
556 die("command line too long");
557
558 conn->in = conn->out = -1;
36ad53ff 559 conn->argv = arg = xcalloc(7, sizeof(*arg));
f364cb88
JS
560 if (protocol == PROTO_SSH) {
561 const char *ssh = getenv("GIT_SSH");
36ad53ff 562 int putty = ssh && strcasestr(ssh, "plink");
f364cb88
JS
563 if (!ssh) ssh = "ssh";
564
565 *arg++ = ssh;
36ad53ff
EY
566 if (putty && !strcasestr(ssh, "tortoiseplink"))
567 *arg++ = "-batch";
f364cb88 568 if (port) {
36ad53ff
EY
569 /* P is for PuTTY, p is for OpenSSH */
570 *arg++ = putty ? "-P" : "-p";
f364cb88 571 *arg++ = port;
4852f723 572 }
f364cb88
JS
573 *arg++ = host;
574 }
575 else {
48a7c1c4
GB
576 /* remove repo-local variables from the environment */
577 conn->env = local_repo_env;
4cfb2a44 578 conn->use_shell = 1;
016fb48b 579 }
f364cb88
JS
580 *arg++ = cmd.buf;
581 *arg = NULL;
582
583 if (start_command(conn))
584 die("unable to fork");
585
586 fd[0] = conn->out; /* read from child's stdout */
587 fd[1] = conn->in; /* write to child's stdin */
588 strbuf_release(&cmd);
4577370e 589 free(url);
da2a95b2
SH
590 if (free_path)
591 free(path);
98158e9c 592 return conn;
f7192598
LT
593}
594
7ffe853b
JK
595int git_connection_is_socket(struct child_process *conn)
596{
597 return conn == &no_fork;
598}
599
98158e9c 600int finish_connect(struct child_process *conn)
f7192598 601{
f364cb88 602 int code;
7ffe853b 603 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
604 return 0;
605
f364cb88
JS
606 code = finish_command(conn);
607 free(conn->argv);
98158e9c 608 free(conn);
f364cb88 609 return code;
f7192598 610}