Change check_ref_format() to take a flags argument
[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,
2718ff09 56 int nr_match, char **match,
40c155ff
JH
57 unsigned int flags,
58 struct extra_have_objects *extra_have)
d1c133f5
LT
59{
60 *list = NULL;
61 for (;;) {
62 struct ref *ref;
63 unsigned char old_sha1[20];
64 static char buffer[1000];
65 char *name;
211b5f9e 66 int len, name_len;
d1c133f5
LT
67
68 len = packet_read_line(in, buffer, sizeof(buffer));
69 if (!len)
70 break;
71 if (buffer[len-1] == '\n')
72 buffer[--len] = 0;
73
a8073289
TPW
74 if (len > 4 && !prefixcmp(buffer, "ERR "))
75 die("remote error: %s", buffer + 4);
76
d1c133f5
LT
77 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
78 die("protocol error: expected sha/ref, got '%s'", buffer);
79 name = buffer + 41;
1a7141ff 80
211b5f9e
JS
81 name_len = strlen(name);
82 if (len != name_len + 41) {
8e0f7003 83 free(server_capabilities);
9befac47 84 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
85 }
86
40c155ff
JH
87 if (extra_have &&
88 name_len == 5 && !memcmp(".have", name, 5)) {
89 add_extra_have(extra_have, old_sha1);
90 continue;
91 }
92
2718ff09 93 if (!check_ref(name, name_len, flags))
cfee10a7 94 continue;
d1c133f5
LT
95 if (nr_match && !path_match(name, nr_match, match))
96 continue;
59c69c0c 97 ref = alloc_ref(buffer + 41);
e702496e 98 hashcpy(ref->old_sha1, old_sha1);
d1c133f5
LT
99 *list = ref;
100 list = &ref->next;
101 }
102 return list;
103}
104
211b5f9e
JS
105int server_supports(const char *feature)
106{
1f5881bb
JS
107 return server_capabilities &&
108 strstr(server_capabilities, feature) != NULL;
211b5f9e
JS
109}
110
013e7c7f
LT
111int path_match(const char *path, int nr, char **match)
112{
113 int i;
114 int pathlen = strlen(path);
115
116 for (i = 0; i < nr; i++) {
117 char *s = match[i];
118 int len = strlen(s);
119
120 if (!len || len > pathlen)
121 continue;
122 if (memcmp(path + pathlen - len, s, len))
123 continue;
124 if (pathlen > len && path[pathlen - len - 1] != '/')
125 continue;
126 *s = 0;
9546010b 127 return (i + 1);
013e7c7f
LT
128 }
129 return 0;
130}
131
2386d658
LT
132enum protocol {
133 PROTO_LOCAL = 1,
134 PROTO_SSH,
4b05548f 135 PROTO_GIT
2386d658
LT
136};
137
138static enum protocol get_protocol(const char *name)
139{
140 if (!strcmp(name, "ssh"))
141 return PROTO_SSH;
142 if (!strcmp(name, "git"))
143 return PROTO_GIT;
c05186cc
LT
144 if (!strcmp(name, "git+ssh"))
145 return PROTO_SSH;
146 if (!strcmp(name, "ssh+git"))
147 return PROTO_SSH;
72a4f4b6
LT
148 if (!strcmp(name, "file"))
149 return PROTO_LOCAL;
2386d658
LT
150 die("I don't handle protocol '%s'", name);
151}
152
5ba88448
YH
153#define STR_(s) # s
154#define STR(s) STR_(s)
2386d658 155
72a534da
ML
156static void get_host_and_port(char **host, const char **port)
157{
158 char *colon, *end;
159
160 if (*host[0] == '[') {
161 end = strchr(*host + 1, ']');
162 if (end) {
163 *end = 0;
164 end++;
165 (*host)++;
166 } else
167 end = *host;
168 } else
169 end = *host;
170 colon = strchr(end, ':');
171
172 if (colon) {
173 *colon = 0;
174 *port = colon + 1;
175 }
176}
177
49744d63 178#ifndef NO_IPV6
4c505f71 179
ba505322
AR
180static const char *ai_name(const struct addrinfo *ai)
181{
785a9857
BK
182 static char addr[NI_MAXHOST];
183 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
184 NI_NUMERICHOST) != 0)
ba505322 185 strcpy(addr, "(unknown)");
785a9857 186
ba505322
AR
187 return addr;
188}
189
5ad312be
JL
190/*
191 * Returns a connected socket() fd, or else die()s.
192 */
7841ce79 193static int git_tcp_connect_sock(char *host, int flags)
2386d658 194{
63a995b6
DZ
195 struct strbuf error_message = STRBUF_INIT;
196 int sockfd = -1;
554fe20d 197 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
198 struct addrinfo hints, *ai0, *ai;
199 int gai;
ba505322 200 int cnt = 0;
5ba88448 201
72a534da
ML
202 get_host_and_port(&host, &port);
203 if (!*port)
204 port = "<none>";
5ba88448
YH
205
206 memset(&hints, 0, sizeof(hints));
207 hints.ai_socktype = SOCK_STREAM;
208 hints.ai_protocol = IPPROTO_TCP;
209
7841ce79
MT
210 if (flags & CONNECT_VERBOSE)
211 fprintf(stderr, "Looking up %s ... ", host);
212
5ba88448
YH
213 gai = getaddrinfo(host, port, &hints, &ai);
214 if (gai)
608d48b2 215 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 216
7841ce79
MT
217 if (flags & CONNECT_VERBOSE)
218 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
219
e08afecd 220 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
5ad312be
JL
221 sockfd = socket(ai->ai_family,
222 ai->ai_socktype, ai->ai_protocol);
63a995b6
DZ
223 if ((sockfd < 0) ||
224 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
225 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
226 host, cnt, ai_name(ai), strerror(errno));
227 if (0 <= sockfd)
228 close(sockfd);
5ba88448
YH
229 sockfd = -1;
230 continue;
2386d658 231 }
ba505322
AR
232 if (flags & CONNECT_VERBOSE)
233 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 234 break;
2386d658
LT
235 }
236
5ba88448 237 freeaddrinfo(ai0);
2386d658 238
2386d658 239 if (sockfd < 0)
63a995b6 240 die("unable to connect to %s:\n%s", host, error_message.buf);
5ba88448 241
7841ce79
MT
242 if (flags & CONNECT_VERBOSE)
243 fprintf(stderr, "done.\n");
244
63a995b6
DZ
245 strbuf_release(&error_message);
246
5ad312be 247 return sockfd;
2386d658
LT
248}
249
49744d63 250#else /* NO_IPV6 */
4c505f71 251
5ad312be
JL
252/*
253 * Returns a connected socket() fd, or else die()s.
254 */
7841ce79 255static int git_tcp_connect_sock(char *host, int flags)
4c505f71 256{
7203a2d1
EFL
257 struct strbuf error_message = STRBUF_INIT;
258 int sockfd = -1;
72a534da
ML
259 const char *port = STR(DEFAULT_GIT_PORT);
260 char *ep;
4c505f71
PA
261 struct hostent *he;
262 struct sockaddr_in sa;
263 char **ap;
264 unsigned int nport;
ba505322 265 int cnt;
4c505f71 266
72a534da 267 get_host_and_port(&host, &port);
4c505f71 268
7841ce79
MT
269 if (flags & CONNECT_VERBOSE)
270 fprintf(stderr, "Looking up %s ... ", host);
271
4c505f71
PA
272 he = gethostbyname(host);
273 if (!he)
274 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
275 nport = strtoul(port, &ep, 10);
276 if ( ep == port || *ep ) {
277 /* Not numeric */
278 struct servent *se = getservbyname(port,"tcp");
279 if ( !se )
d7530708 280 die("Unknown port %s", port);
4c505f71
PA
281 nport = se->s_port;
282 }
283
7841ce79
MT
284 if (flags & CONNECT_VERBOSE)
285 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
286
ba505322 287 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71
PA
288 memset(&sa, 0, sizeof sa);
289 sa.sin_family = he->h_addrtype;
6573faff 290 sa.sin_port = htons(nport);
c6164218 291 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 292
7203a2d1
EFL
293 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
294 if ((sockfd < 0) ||
295 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
296 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
ba505322
AR
297 host,
298 cnt,
299 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
7203a2d1
EFL
300 strerror(errno));
301 if (0 <= sockfd)
302 close(sockfd);
4c505f71
PA
303 sockfd = -1;
304 continue;
305 }
ba505322
AR
306 if (flags & CONNECT_VERBOSE)
307 fprintf(stderr, "%s ",
308 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
309 break;
310 }
311
312 if (sockfd < 0)
7203a2d1 313 die("unable to connect to %s:\n%s", host, error_message.buf);
4c505f71 314
7841ce79
MT
315 if (flags & CONNECT_VERBOSE)
316 fprintf(stderr, "done.\n");
317
5ad312be
JL
318 return sockfd;
319}
320
321#endif /* NO_IPV6 */
322
323
7841ce79 324static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 325{
7841ce79 326 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 327
4c505f71 328 fd[0] = sockfd;
ec587fde 329 fd[1] = dup(sockfd);
4c505f71
PA
330}
331
4c505f71 332
96f1e58f 333static char *git_proxy_command;
f8014776 334
ef90d6d4
JS
335static int git_proxy_command_options(const char *var, const char *value,
336 void *cb)
f8014776 337{
e814bc4d 338 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
339 const char *for_pos;
340 int matchlen = -1;
341 int hostlen;
15112c95
EFL
342 const char *rhost_name = cb;
343 int rhost_len = strlen(rhost_name);
c3df8568 344
e814bc4d 345 if (git_proxy_command)
f8014776 346 return 0;
c64b9ad0
JH
347 if (!value)
348 return config_error_nonbool(var);
e814bc4d
JH
349 /* [core]
350 * ;# matches www.kernel.org as well
351 * gitproxy = netcatter-1 for kernel.org
352 * gitproxy = netcatter-2 for sample.xz
353 * gitproxy = netcatter-default
354 */
c3df8568 355 for_pos = strstr(value, " for ");
e814bc4d
JH
356 if (!for_pos)
357 /* matches everybody */
358 matchlen = strlen(value);
359 else {
360 hostlen = strlen(for_pos + 5);
361 if (rhost_len < hostlen)
362 matchlen = -1;
363 else if (!strncmp(for_pos + 5,
364 rhost_name + rhost_len - hostlen,
365 hostlen) &&
366 ((rhost_len == hostlen) ||
367 rhost_name[rhost_len - hostlen -1] == '.'))
368 matchlen = for_pos - value;
369 else
370 matchlen = -1;
371 }
372 if (0 <= matchlen) {
373 /* core.gitproxy = none for kernel.org */
a6080a0a 374 if (matchlen == 4 &&
e814bc4d
JH
375 !memcmp(value, "none", 4))
376 matchlen = 0;
182af834 377 git_proxy_command = xmemdupz(value, matchlen);
f8014776 378 }
e814bc4d 379 return 0;
f8014776
PC
380 }
381
ef90d6d4 382 return git_default_config(var, value, cb);
f8014776
PC
383}
384
e814bc4d 385static int git_use_proxy(const char *host)
f8014776
PC
386{
387 git_proxy_command = getenv("GIT_PROXY_COMMAND");
15112c95 388 git_config(git_proxy_command_options, (void*)host);
e814bc4d 389 return (git_proxy_command && *git_proxy_command);
f8014776
PC
390}
391
5cbf8246 392static struct child_process *git_proxy_connect(int fd[2], char *host)
f8014776 393{
554fe20d 394 const char *port = STR(DEFAULT_GIT_PORT);
5cbf8246
JK
395 const char **argv;
396 struct child_process *proxy;
f8014776 397
72a534da 398 get_host_and_port(&host, &port);
f8014776 399
5cbf8246 400 argv = xmalloc(sizeof(*argv) * 4);
15a1c012
SP
401 argv[0] = git_proxy_command;
402 argv[1] = host;
403 argv[2] = port;
404 argv[3] = NULL;
5cbf8246
JK
405 proxy = xcalloc(1, sizeof(*proxy));
406 proxy->argv = argv;
407 proxy->in = -1;
408 proxy->out = -1;
409 if (start_command(proxy))
15a1c012 410 die("cannot start proxy %s", argv[0]);
5cbf8246
JK
411 fd[0] = proxy->out; /* read from proxy stdout */
412 fd[1] = proxy->in; /* write to proxy stdin */
413 return proxy;
f8014776
PC
414}
415
0f503d77
CC
416#define MAX_CMD_LEN 1024
417
2af202be 418static char *get_port(char *host)
2e776665
LT
419{
420 char *end;
421 char *p = strchr(host, ':');
422
423 if (p) {
8f148253
RS
424 long port = strtol(p + 1, &end, 10);
425 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
2e776665
LT
426 *p = '\0';
427 return p+1;
428 }
429 }
430
431 return NULL;
432}
433
fb32c917
JS
434static struct child_process no_fork;
435
f7192598 436/*
fb32c917
JS
437 * This returns a dummy child_process if the transport protocol does not
438 * need fork(2), or a struct child_process object if it does. Once done,
439 * finish the connection with finish_connect() with the value returned from
440 * this function (it is safe to call finish_connect() with NULL to support
441 * the former case).
f42a5c4e 442 *
fb32c917
JS
443 * If it returns, the connect is successful; it just dies on errors (this
444 * will hopefully be changed in a libification effort, to return NULL when
445 * the connection failed).
f7192598 446 */
4577370e 447struct child_process *git_connect(int fd[2], const char *url_orig,
98158e9c 448 const char *prog, int flags)
f7192598 449{
9d2e9420 450 char *url;
8e76bf3f 451 char *host, *path;
356bece0
YH
452 char *end;
453 int c;
5cbf8246 454 struct child_process *conn = &no_fork;
faea9ccb 455 enum protocol protocol = PROTO_LOCAL;
da2a95b2 456 int free_path = 0;
2e776665 457 char *port = NULL;
f364cb88
JS
458 const char **arg;
459 struct strbuf cmd;
faea9ccb 460
f0b7367c
JH
461 /* Without this we cannot rely on waitpid() to tell
462 * what happened to our children.
463 */
464 signal(SIGCHLD, SIG_DFL);
465
9d2e9420
JK
466 if (is_url(url_orig))
467 url = url_decode(url_orig);
468 else
469 url = xstrdup(url_orig);
470
faea9ccb 471 host = strstr(url, "://");
eeefa7c9 472 if (host) {
faea9ccb
AE
473 *host = '\0';
474 protocol = get_protocol(url);
475 host += 3;
356bece0
YH
476 c = '/';
477 } else {
f7192598 478 host = url;
356bece0
YH
479 c = ':';
480 }
481
9aa5053d
IL
482 /*
483 * Don't do destructive transforms with git:// as that
9517e6b8 484 * protocol code does '[]' unwrapping of its own.
9aa5053d 485 */
356bece0
YH
486 if (host[0] == '[') {
487 end = strchr(host + 1, ']');
488 if (end) {
9aa5053d
IL
489 if (protocol != PROTO_GIT) {
490 *end = 0;
491 host++;
492 }
356bece0 493 end++;
356bece0
YH
494 } else
495 end = host;
496 } else
497 end = host;
498
499 path = strchr(end, c);
be501813 500 if (path && !has_dos_drive_prefix(end)) {
72a4f4b6 501 if (c == ':') {
faea9ccb 502 protocol = PROTO_SSH;
356bece0 503 *path++ = '\0';
72a4f4b6
LT
504 }
505 } else
506 path = end;
2386d658 507
faea9ccb
AE
508 if (!path || !*path)
509 die("No path specified. See 'man git-pull' for valid url syntax");
510
511 /*
512 * null-terminate hostname and point path to ~ for URL's like this:
513 * ssh://host.xz/~user/repo
514 */
515 if (protocol != PROTO_LOCAL && host != url) {
516 char *ptr = path;
517 if (path[1] == '~')
518 path++;
da2a95b2 519 else {
9befac47 520 path = xstrdup(ptr);
da2a95b2
SH
521 free_path = 1;
522 }
faea9ccb
AE
523
524 *ptr = '\0';
525 }
526
2e776665
LT
527 /*
528 * Add support for ssh port: ssh://host.xy:<port>/...
529 */
530 if (protocol == PROTO_SSH && host != url)
531 port = get_port(host);
532
f8014776 533 if (protocol == PROTO_GIT) {
5ad312be
JL
534 /* These underlying connection commands die() if they
535 * cannot connect.
536 */
9befac47 537 char *target_host = xstrdup(host);
e814bc4d 538 if (git_use_proxy(host))
5cbf8246 539 conn = git_proxy_connect(fd, host);
da2a95b2 540 else
7841ce79 541 git_tcp_connect(fd, host, flags);
5ad312be
JL
542 /*
543 * Separate original protocol components prog and path
73bb33a9
SP
544 * from extended host header with a NUL byte.
545 *
546 * Note: Do not add any other headers here! Doing so
547 * will cause older git-daemon servers to crash.
5ad312be
JL
548 */
549 packet_write(fd[1],
550 "%s %s%chost=%s%c",
551 prog, path, 0,
552 target_host, 0);
553 free(target_host);
4577370e 554 free(url);
da2a95b2
SH
555 if (free_path)
556 free(path);
5cbf8246 557 return conn;
f8014776 558 }
2386d658 559
98158e9c 560 conn = xcalloc(1, sizeof(*conn));
2e776665 561
f364cb88
JS
562 strbuf_init(&cmd, MAX_CMD_LEN);
563 strbuf_addstr(&cmd, prog);
564 strbuf_addch(&cmd, ' ');
565 sq_quote_buf(&cmd, path);
566 if (cmd.len >= MAX_CMD_LEN)
567 die("command line too long");
568
569 conn->in = conn->out = -1;
36ad53ff 570 conn->argv = arg = xcalloc(7, sizeof(*arg));
f364cb88
JS
571 if (protocol == PROTO_SSH) {
572 const char *ssh = getenv("GIT_SSH");
36ad53ff 573 int putty = ssh && strcasestr(ssh, "plink");
f364cb88
JS
574 if (!ssh) ssh = "ssh";
575
576 *arg++ = ssh;
36ad53ff
EY
577 if (putty && !strcasestr(ssh, "tortoiseplink"))
578 *arg++ = "-batch";
f364cb88 579 if (port) {
36ad53ff
EY
580 /* P is for PuTTY, p is for OpenSSH */
581 *arg++ = putty ? "-P" : "-p";
f364cb88 582 *arg++ = port;
4852f723 583 }
f364cb88
JS
584 *arg++ = host;
585 }
586 else {
48a7c1c4
GB
587 /* remove repo-local variables from the environment */
588 conn->env = local_repo_env;
4cfb2a44 589 conn->use_shell = 1;
016fb48b 590 }
f364cb88
JS
591 *arg++ = cmd.buf;
592 *arg = NULL;
593
594 if (start_command(conn))
595 die("unable to fork");
596
597 fd[0] = conn->out; /* read from child's stdout */
598 fd[1] = conn->in; /* write to child's stdin */
599 strbuf_release(&cmd);
4577370e 600 free(url);
da2a95b2
SH
601 if (free_path)
602 free(path);
98158e9c 603 return conn;
f7192598
LT
604}
605
7ffe853b
JK
606int git_connection_is_socket(struct child_process *conn)
607{
608 return conn == &no_fork;
609}
610
98158e9c 611int finish_connect(struct child_process *conn)
f7192598 612{
f364cb88 613 int code;
7ffe853b 614 if (!conn || git_connection_is_socket(conn))
f42a5c4e
FBH
615 return 0;
616
f364cb88
JS
617 code = finish_command(conn);
618 free(conn->argv);
98158e9c 619 free(conn);
f364cb88 620 return code;
f7192598 621}
f206063b
FL
622
623char *git_getpass(const char *prompt)
624{
d3e7da89 625 const char *askpass;
f206063b
FL
626 struct child_process pass;
627 const char *args[3];
628 static struct strbuf buffer = STRBUF_INIT;
629
630 askpass = getenv("GIT_ASKPASS");
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AK
631 if (!askpass)
632 askpass = askpass_program;
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KF
633 if (!askpass)
634 askpass = getenv("SSH_ASKPASS");
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JS
635 if (!askpass || !(*askpass)) {
636 char *result = getpass(prompt);
637 if (!result)
638 die_errno("Could not read password");
639 return result;
640 }
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FL
641
642 args[0] = askpass;
643 args[1] = prompt;
644 args[2] = NULL;
645
646 memset(&pass, 0, sizeof(pass));
647 pass.argv = args;
648 pass.out = -1;
649
650 if (start_command(&pass))
651 exit(1);
652
653 strbuf_reset(&buffer);
654 if (strbuf_read(&buffer, pass.out, 20) < 0)
655 die("failed to read password from %s\n", askpass);
656
657 close(pass.out);
658
659 if (finish_command(&pass))
660 exit(1);
661
662 strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
663
664 return buffer.buf;
665}