receive-pack: make it a builtin
[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"
f7192598 8
96f1e58f 9static char *server_capabilities;
211b5f9e 10
2718ff09
LT
11static int check_ref(const char *name, int len, unsigned int flags)
12{
13 if (!flags)
14 return 1;
15
c41e20b3 16 if (len < 5 || memcmp(name, "refs/", 5))
2718ff09
LT
17 return 0;
18
19 /* Skip the "refs/" part */
20 name += 5;
21 len -= 5;
22
23 /* REF_NORMAL means that we don't want the magic fake tag refs */
24 if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
25 return 0;
26
27 /* REF_HEADS means that we want regular branch heads */
28 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
29 return 1;
30
31 /* REF_TAGS means that we want tags */
32 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
33 return 1;
34
35 /* All type bits clear means that we are ok with anything */
36 return !(flags & ~REF_NORMAL);
37}
38
4577370e
DB
39int check_ref_type(const struct ref *ref, int flags)
40{
41 return check_ref(ref->name, strlen(ref->name), flags);
42}
43
d1c133f5
LT
44/*
45 * Read all the refs from the other end
46 */
1a7141ff 47struct ref **get_remote_heads(int in, struct ref **list,
2718ff09
LT
48 int nr_match, char **match,
49 unsigned int flags)
d1c133f5
LT
50{
51 *list = NULL;
52 for (;;) {
53 struct ref *ref;
54 unsigned char old_sha1[20];
55 static char buffer[1000];
56 char *name;
211b5f9e 57 int len, name_len;
d1c133f5
LT
58
59 len = packet_read_line(in, buffer, sizeof(buffer));
60 if (!len)
61 break;
62 if (buffer[len-1] == '\n')
63 buffer[--len] = 0;
64
65 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
66 die("protocol error: expected sha/ref, got '%s'", buffer);
67 name = buffer + 41;
1a7141ff 68
211b5f9e
JS
69 name_len = strlen(name);
70 if (len != name_len + 41) {
8e0f7003 71 free(server_capabilities);
9befac47 72 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
73 }
74
2718ff09 75 if (!check_ref(name, name_len, flags))
cfee10a7 76 continue;
d1c133f5
LT
77 if (nr_match && !path_match(name, nr_match, match))
78 continue;
90446a00 79 ref = alloc_ref(name_len + 1);
e702496e 80 hashcpy(ref->old_sha1, old_sha1);
90446a00 81 memcpy(ref->name, buffer + 41, name_len + 1);
d1c133f5
LT
82 *list = ref;
83 list = &ref->next;
84 }
85 return list;
86}
87
211b5f9e
JS
88int server_supports(const char *feature)
89{
1f5881bb
JS
90 return server_capabilities &&
91 strstr(server_capabilities, feature) != NULL;
211b5f9e
JS
92}
93
41cb7488
LT
94int get_ack(int fd, unsigned char *result_sha1)
95{
96 static char line[1000];
97 int len = packet_read_line(fd, line, sizeof(line));
98
99 if (!len)
7e44c935 100 die("git fetch-pack: expected ACK/NAK, got EOF");
41cb7488
LT
101 if (line[len-1] == '\n')
102 line[--len] = 0;
103 if (!strcmp(line, "NAK"))
104 return 0;
cc44c765 105 if (!prefixcmp(line, "ACK ")) {
c4c86f07
JS
106 if (!get_sha1_hex(line+4, result_sha1)) {
107 if (strstr(line+45, "continue"))
108 return 2;
41cb7488 109 return 1;
c4c86f07 110 }
41cb7488 111 }
7e44c935 112 die("git fetch_pack: expected ACK/NAK, got '%s'", line);
41cb7488
LT
113}
114
013e7c7f
LT
115int path_match(const char *path, int nr, char **match)
116{
117 int i;
118 int pathlen = strlen(path);
119
120 for (i = 0; i < nr; i++) {
121 char *s = match[i];
122 int len = strlen(s);
123
124 if (!len || len > pathlen)
125 continue;
126 if (memcmp(path + pathlen - len, s, len))
127 continue;
128 if (pathlen > len && path[pathlen - len - 1] != '/')
129 continue;
130 *s = 0;
9546010b 131 return (i + 1);
013e7c7f
LT
132 }
133 return 0;
134}
135
2386d658
LT
136enum protocol {
137 PROTO_LOCAL = 1,
138 PROTO_SSH,
139 PROTO_GIT,
140};
141
142static enum protocol get_protocol(const char *name)
143{
144 if (!strcmp(name, "ssh"))
145 return PROTO_SSH;
146 if (!strcmp(name, "git"))
147 return PROTO_GIT;
c05186cc
LT
148 if (!strcmp(name, "git+ssh"))
149 return PROTO_SSH;
150 if (!strcmp(name, "ssh+git"))
151 return PROTO_SSH;
72a4f4b6
LT
152 if (!strcmp(name, "file"))
153 return PROTO_LOCAL;
2386d658
LT
154 die("I don't handle protocol '%s'", name);
155}
156
5ba88448
YH
157#define STR_(s) # s
158#define STR(s) STR_(s)
2386d658 159
49744d63 160#ifndef NO_IPV6
4c505f71 161
ba505322
AR
162static const char *ai_name(const struct addrinfo *ai)
163{
164 static char addr[INET_ADDRSTRLEN];
165 if ( AF_INET == ai->ai_family ) {
166 struct sockaddr_in *in;
167 in = (struct sockaddr_in *)ai->ai_addr;
168 inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
169 } else if ( AF_INET6 == ai->ai_family ) {
170 struct sockaddr_in6 *in;
171 in = (struct sockaddr_in6 *)ai->ai_addr;
172 inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
173 } else {
174 strcpy(addr, "(unknown)");
175 }
176 return addr;
177}
178
5ad312be
JL
179/*
180 * Returns a connected socket() fd, or else die()s.
181 */
7841ce79 182static int git_tcp_connect_sock(char *host, int flags)
2386d658 183{
ac3bc6c1 184 int sockfd = -1, saved_errno = 0;
5ba88448 185 char *colon, *end;
554fe20d 186 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
187 struct addrinfo hints, *ai0, *ai;
188 int gai;
ba505322 189 int cnt = 0;
5ba88448
YH
190
191 if (host[0] == '[') {
192 end = strchr(host + 1, ']');
193 if (end) {
194 *end = 0;
195 end++;
196 host++;
197 } else
198 end = host;
199 } else
200 end = host;
201 colon = strchr(end, ':');
202
ce6f8e7e
LT
203 if (colon) {
204 *colon = 0;
5ba88448 205 port = colon + 1;
608d48b2
LT
206 if (!*port)
207 port = "<none>";
ce6f8e7e 208 }
5ba88448
YH
209
210 memset(&hints, 0, sizeof(hints));
211 hints.ai_socktype = SOCK_STREAM;
212 hints.ai_protocol = IPPROTO_TCP;
213
7841ce79
MT
214 if (flags & CONNECT_VERBOSE)
215 fprintf(stderr, "Looking up %s ... ", host);
216
5ba88448
YH
217 gai = getaddrinfo(host, port, &hints, &ai);
218 if (gai)
608d48b2 219 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 220
7841ce79
MT
221 if (flags & CONNECT_VERBOSE)
222 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
223
5ba88448 224 for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be
JL
225 sockfd = socket(ai->ai_family,
226 ai->ai_socktype, ai->ai_protocol);
ac3bc6c1
PB
227 if (sockfd < 0) {
228 saved_errno = errno;
5ba88448 229 continue;
ac3bc6c1 230 }
5ba88448 231 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
ac3bc6c1 232 saved_errno = errno;
7cbf2f24 233 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322
AR
234 host,
235 cnt,
236 ai_name(ai),
ba505322 237 strerror(saved_errno));
5ba88448
YH
238 close(sockfd);
239 sockfd = -1;
240 continue;
2386d658 241 }
ba505322
AR
242 if (flags & CONNECT_VERBOSE)
243 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 244 break;
2386d658
LT
245 }
246
5ba88448 247 freeaddrinfo(ai0);
2386d658 248
2386d658 249 if (sockfd < 0)
ac3bc6c1 250 die("unable to connect a socket (%s)", strerror(saved_errno));
5ba88448 251
7841ce79
MT
252 if (flags & CONNECT_VERBOSE)
253 fprintf(stderr, "done.\n");
254
5ad312be 255 return sockfd;
2386d658
LT
256}
257
49744d63 258#else /* NO_IPV6 */
4c505f71 259
5ad312be
JL
260/*
261 * Returns a connected socket() fd, or else die()s.
262 */
7841ce79 263static int git_tcp_connect_sock(char *host, int flags)
4c505f71 264{
ac3bc6c1 265 int sockfd = -1, saved_errno = 0;
4c505f71
PA
266 char *colon, *end;
267 char *port = STR(DEFAULT_GIT_PORT), *ep;
268 struct hostent *he;
269 struct sockaddr_in sa;
270 char **ap;
271 unsigned int nport;
ba505322 272 int cnt;
4c505f71
PA
273
274 if (host[0] == '[') {
275 end = strchr(host + 1, ']');
276 if (end) {
277 *end = 0;
278 end++;
279 host++;
280 } else
281 end = host;
282 } else
283 end = host;
284 colon = strchr(end, ':');
285
286 if (colon) {
287 *colon = 0;
288 port = colon + 1;
289 }
290
7841ce79
MT
291 if (flags & CONNECT_VERBOSE)
292 fprintf(stderr, "Looking up %s ... ", host);
293
4c505f71
PA
294 he = gethostbyname(host);
295 if (!he)
296 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
297 nport = strtoul(port, &ep, 10);
298 if ( ep == port || *ep ) {
299 /* Not numeric */
300 struct servent *se = getservbyname(port,"tcp");
301 if ( !se )
302 die("Unknown port %s\n", port);
303 nport = se->s_port;
304 }
305
7841ce79
MT
306 if (flags & CONNECT_VERBOSE)
307 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
308
ba505322 309 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71 310 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
ac3bc6c1
PB
311 if (sockfd < 0) {
312 saved_errno = errno;
4c505f71 313 continue;
ac3bc6c1 314 }
4c505f71
PA
315
316 memset(&sa, 0, sizeof sa);
317 sa.sin_family = he->h_addrtype;
6573faff 318 sa.sin_port = htons(nport);
c6164218 319 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71
PA
320
321 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
ac3bc6c1 322 saved_errno = errno;
7cbf2f24 323 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322
AR
324 host,
325 cnt,
326 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
ba505322 327 strerror(saved_errno));
4c505f71
PA
328 close(sockfd);
329 sockfd = -1;
330 continue;
331 }
ba505322
AR
332 if (flags & CONNECT_VERBOSE)
333 fprintf(stderr, "%s ",
334 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
335 break;
336 }
337
338 if (sockfd < 0)
ac3bc6c1 339 die("unable to connect a socket (%s)", strerror(saved_errno));
4c505f71 340
7841ce79
MT
341 if (flags & CONNECT_VERBOSE)
342 fprintf(stderr, "done.\n");
343
5ad312be
JL
344 return sockfd;
345}
346
347#endif /* NO_IPV6 */
348
349
7841ce79 350static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 351{
7841ce79 352 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 353
4c505f71 354 fd[0] = sockfd;
ec587fde 355 fd[1] = dup(sockfd);
4c505f71
PA
356}
357
4c505f71 358
96f1e58f
DR
359static char *git_proxy_command;
360static const char *rhost_name;
e814bc4d 361static int rhost_len;
f8014776 362
ef90d6d4
JS
363static int git_proxy_command_options(const char *var, const char *value,
364 void *cb)
f8014776 365{
e814bc4d 366 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
367 const char *for_pos;
368 int matchlen = -1;
369 int hostlen;
370
e814bc4d 371 if (git_proxy_command)
f8014776 372 return 0;
c64b9ad0
JH
373 if (!value)
374 return config_error_nonbool(var);
e814bc4d
JH
375 /* [core]
376 * ;# matches www.kernel.org as well
377 * gitproxy = netcatter-1 for kernel.org
378 * gitproxy = netcatter-2 for sample.xz
379 * gitproxy = netcatter-default
380 */
c3df8568 381 for_pos = strstr(value, " for ");
e814bc4d
JH
382 if (!for_pos)
383 /* matches everybody */
384 matchlen = strlen(value);
385 else {
386 hostlen = strlen(for_pos + 5);
387 if (rhost_len < hostlen)
388 matchlen = -1;
389 else if (!strncmp(for_pos + 5,
390 rhost_name + rhost_len - hostlen,
391 hostlen) &&
392 ((rhost_len == hostlen) ||
393 rhost_name[rhost_len - hostlen -1] == '.'))
394 matchlen = for_pos - value;
395 else
396 matchlen = -1;
397 }
398 if (0 <= matchlen) {
399 /* core.gitproxy = none for kernel.org */
a6080a0a 400 if (matchlen == 4 &&
e814bc4d
JH
401 !memcmp(value, "none", 4))
402 matchlen = 0;
182af834 403 git_proxy_command = xmemdupz(value, matchlen);
f8014776 404 }
e814bc4d 405 return 0;
f8014776
PC
406 }
407
ef90d6d4 408 return git_default_config(var, value, cb);
f8014776
PC
409}
410
e814bc4d 411static int git_use_proxy(const char *host)
f8014776 412{
e814bc4d
JH
413 rhost_name = host;
414 rhost_len = strlen(host);
f8014776 415 git_proxy_command = getenv("GIT_PROXY_COMMAND");
ef90d6d4 416 git_config(git_proxy_command_options, NULL);
e814bc4d
JH
417 rhost_name = NULL;
418 return (git_proxy_command && *git_proxy_command);
f8014776
PC
419}
420
c78963d2 421static void git_proxy_connect(int fd[2], char *host)
f8014776 422{
554fe20d 423 const char *port = STR(DEFAULT_GIT_PORT);
f8014776 424 char *colon, *end;
15a1c012
SP
425 const char *argv[4];
426 struct child_process proxy;
f8014776
PC
427
428 if (host[0] == '[') {
429 end = strchr(host + 1, ']');
430 if (end) {
431 *end = 0;
432 end++;
433 host++;
434 } else
435 end = host;
436 } else
437 end = host;
438 colon = strchr(end, ':');
439
440 if (colon) {
441 *colon = 0;
442 port = colon + 1;
443 }
444
15a1c012
SP
445 argv[0] = git_proxy_command;
446 argv[1] = host;
447 argv[2] = port;
448 argv[3] = NULL;
449 memset(&proxy, 0, sizeof(proxy));
450 proxy.argv = argv;
451 proxy.in = -1;
452 proxy.out = -1;
453 if (start_command(&proxy))
454 die("cannot start proxy %s", argv[0]);
455 fd[0] = proxy.out; /* read from proxy stdout */
456 fd[1] = proxy.in; /* write to proxy stdin */
f8014776
PC
457}
458
0f503d77
CC
459#define MAX_CMD_LEN 1024
460
2e776665
LT
461char *get_port(char *host)
462{
463 char *end;
464 char *p = strchr(host, ':');
465
466 if (p) {
467 strtol(p+1, &end, 10);
468 if (*end == '\0') {
469 *p = '\0';
470 return p+1;
471 }
472 }
473
474 return NULL;
475}
476
fb32c917
JS
477static struct child_process no_fork;
478
f7192598 479/*
fb32c917
JS
480 * This returns a dummy child_process if the transport protocol does not
481 * need fork(2), or a struct child_process object if it does. Once done,
482 * finish the connection with finish_connect() with the value returned from
483 * this function (it is safe to call finish_connect() with NULL to support
484 * the former case).
f42a5c4e 485 *
fb32c917
JS
486 * If it returns, the connect is successful; it just dies on errors (this
487 * will hopefully be changed in a libification effort, to return NULL when
488 * the connection failed).
f7192598 489 */
4577370e 490struct child_process *git_connect(int fd[2], const char *url_orig,
98158e9c 491 const char *prog, int flags)
f7192598 492{
4577370e 493 char *url = xstrdup(url_orig);
faea9ccb 494 char *host, *path = url;
356bece0
YH
495 char *end;
496 int c;
98158e9c 497 struct child_process *conn;
faea9ccb 498 enum protocol protocol = PROTO_LOCAL;
da2a95b2 499 int free_path = 0;
2e776665 500 char *port = NULL;
f364cb88
JS
501 const char **arg;
502 struct strbuf cmd;
faea9ccb 503
f0b7367c
JH
504 /* Without this we cannot rely on waitpid() to tell
505 * what happened to our children.
506 */
507 signal(SIGCHLD, SIG_DFL);
508
faea9ccb
AE
509 host = strstr(url, "://");
510 if(host) {
511 *host = '\0';
512 protocol = get_protocol(url);
513 host += 3;
356bece0
YH
514 c = '/';
515 } else {
f7192598 516 host = url;
356bece0
YH
517 c = ':';
518 }
519
520 if (host[0] == '[') {
521 end = strchr(host + 1, ']');
522 if (end) {
523 *end = 0;
524 end++;
525 host++;
526 } else
527 end = host;
528 } else
529 end = host;
530
531 path = strchr(end, c);
be501813 532 if (path && !has_dos_drive_prefix(end)) {
72a4f4b6 533 if (c == ':') {
faea9ccb 534 protocol = PROTO_SSH;
356bece0 535 *path++ = '\0';
72a4f4b6
LT
536 }
537 } else
538 path = end;
2386d658 539
faea9ccb
AE
540 if (!path || !*path)
541 die("No path specified. See 'man git-pull' for valid url syntax");
542
543 /*
544 * null-terminate hostname and point path to ~ for URL's like this:
545 * ssh://host.xz/~user/repo
546 */
547 if (protocol != PROTO_LOCAL && host != url) {
548 char *ptr = path;
549 if (path[1] == '~')
550 path++;
da2a95b2 551 else {
9befac47 552 path = xstrdup(ptr);
da2a95b2
SH
553 free_path = 1;
554 }
faea9ccb
AE
555
556 *ptr = '\0';
557 }
558
2e776665
LT
559 /*
560 * Add support for ssh port: ssh://host.xy:<port>/...
561 */
562 if (protocol == PROTO_SSH && host != url)
563 port = get_port(host);
564
f8014776 565 if (protocol == PROTO_GIT) {
5ad312be
JL
566 /* These underlying connection commands die() if they
567 * cannot connect.
568 */
9befac47 569 char *target_host = xstrdup(host);
e814bc4d 570 if (git_use_proxy(host))
c78963d2 571 git_proxy_connect(fd, host);
da2a95b2 572 else
7841ce79 573 git_tcp_connect(fd, host, flags);
5ad312be
JL
574 /*
575 * Separate original protocol components prog and path
576 * from extended components with a NUL byte.
577 */
578 packet_write(fd[1],
579 "%s %s%chost=%s%c",
580 prog, path, 0,
581 target_host, 0);
582 free(target_host);
4577370e 583 free(url);
da2a95b2
SH
584 if (free_path)
585 free(path);
fb32c917 586 return &no_fork;
f8014776 587 }
2386d658 588
98158e9c 589 conn = xcalloc(1, sizeof(*conn));
2e776665 590
f364cb88
JS
591 strbuf_init(&cmd, MAX_CMD_LEN);
592 strbuf_addstr(&cmd, prog);
593 strbuf_addch(&cmd, ' ');
594 sq_quote_buf(&cmd, path);
595 if (cmd.len >= MAX_CMD_LEN)
596 die("command line too long");
597
598 conn->in = conn->out = -1;
599 conn->argv = arg = xcalloc(6, sizeof(*arg));
600 if (protocol == PROTO_SSH) {
601 const char *ssh = getenv("GIT_SSH");
602 if (!ssh) ssh = "ssh";
603
604 *arg++ = ssh;
605 if (port) {
606 *arg++ = "-p";
607 *arg++ = port;
4852f723 608 }
f364cb88
JS
609 *arg++ = host;
610 }
611 else {
612 /* remove these from the environment */
613 const char *env[] = {
614 ALTERNATE_DB_ENVIRONMENT,
615 DB_ENVIRONMENT,
616 GIT_DIR_ENVIRONMENT,
617 GIT_WORK_TREE_ENVIRONMENT,
618 GRAFT_ENVIRONMENT,
619 INDEX_ENVIRONMENT,
620 NULL
621 };
622 conn->env = env;
623 *arg++ = "sh";
624 *arg++ = "-c";
016fb48b 625 }
f364cb88
JS
626 *arg++ = cmd.buf;
627 *arg = NULL;
628
629 if (start_command(conn))
630 die("unable to fork");
631
632 fd[0] = conn->out; /* read from child's stdout */
633 fd[1] = conn->in; /* write to child's stdin */
634 strbuf_release(&cmd);
4577370e 635 free(url);
da2a95b2
SH
636 if (free_path)
637 free(path);
98158e9c 638 return conn;
f7192598
LT
639}
640
98158e9c 641int finish_connect(struct child_process *conn)
f7192598 642{
f364cb88 643 int code;
fb32c917 644 if (!conn || conn == &no_fork)
f42a5c4e
FBH
645 return 0;
646
f364cb88
JS
647 code = finish_command(conn);
648 free(conn->argv);
98158e9c 649 free(conn);
f364cb88 650 return code;
f7192598 651}