Introduce receive.denyDeletes
[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
40c155ff
JH
44static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
45{
46 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
47 hashcpy(&(extra->array[extra->nr][0]), sha1);
48 extra->nr++;
49}
50
d1c133f5
LT
51/*
52 * Read all the refs from the other end
53 */
1a7141ff 54struct ref **get_remote_heads(int in, struct ref **list,
2718ff09 55 int nr_match, char **match,
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
73 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
74 die("protocol error: expected sha/ref, got '%s'", buffer);
75 name = buffer + 41;
1a7141ff 76
211b5f9e
JS
77 name_len = strlen(name);
78 if (len != name_len + 41) {
8e0f7003 79 free(server_capabilities);
9befac47 80 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
81 }
82
40c155ff
JH
83 if (extra_have &&
84 name_len == 5 && !memcmp(".have", name, 5)) {
85 add_extra_have(extra_have, old_sha1);
86 continue;
87 }
88
2718ff09 89 if (!check_ref(name, name_len, flags))
cfee10a7 90 continue;
d1c133f5
LT
91 if (nr_match && !path_match(name, nr_match, match))
92 continue;
59c69c0c 93 ref = alloc_ref(buffer + 41);
e702496e 94 hashcpy(ref->old_sha1, old_sha1);
d1c133f5
LT
95 *list = ref;
96 list = &ref->next;
97 }
98 return list;
99}
100
211b5f9e
JS
101int server_supports(const char *feature)
102{
1f5881bb
JS
103 return server_capabilities &&
104 strstr(server_capabilities, feature) != NULL;
211b5f9e
JS
105}
106
41cb7488
LT
107int get_ack(int fd, unsigned char *result_sha1)
108{
109 static char line[1000];
110 int len = packet_read_line(fd, line, sizeof(line));
111
112 if (!len)
7e44c935 113 die("git fetch-pack: expected ACK/NAK, got EOF");
41cb7488
LT
114 if (line[len-1] == '\n')
115 line[--len] = 0;
116 if (!strcmp(line, "NAK"))
117 return 0;
cc44c765 118 if (!prefixcmp(line, "ACK ")) {
c4c86f07
JS
119 if (!get_sha1_hex(line+4, result_sha1)) {
120 if (strstr(line+45, "continue"))
121 return 2;
41cb7488 122 return 1;
c4c86f07 123 }
41cb7488 124 }
7e44c935 125 die("git fetch_pack: expected ACK/NAK, got '%s'", line);
41cb7488
LT
126}
127
013e7c7f
LT
128int path_match(const char *path, int nr, char **match)
129{
130 int i;
131 int pathlen = strlen(path);
132
133 for (i = 0; i < nr; i++) {
134 char *s = match[i];
135 int len = strlen(s);
136
137 if (!len || len > pathlen)
138 continue;
139 if (memcmp(path + pathlen - len, s, len))
140 continue;
141 if (pathlen > len && path[pathlen - len - 1] != '/')
142 continue;
143 *s = 0;
9546010b 144 return (i + 1);
013e7c7f
LT
145 }
146 return 0;
147}
148
2386d658
LT
149enum protocol {
150 PROTO_LOCAL = 1,
151 PROTO_SSH,
152 PROTO_GIT,
153};
154
155static enum protocol get_protocol(const char *name)
156{
157 if (!strcmp(name, "ssh"))
158 return PROTO_SSH;
159 if (!strcmp(name, "git"))
160 return PROTO_GIT;
c05186cc
LT
161 if (!strcmp(name, "git+ssh"))
162 return PROTO_SSH;
163 if (!strcmp(name, "ssh+git"))
164 return PROTO_SSH;
72a4f4b6
LT
165 if (!strcmp(name, "file"))
166 return PROTO_LOCAL;
2386d658
LT
167 die("I don't handle protocol '%s'", name);
168}
169
5ba88448
YH
170#define STR_(s) # s
171#define STR(s) STR_(s)
2386d658 172
49744d63 173#ifndef NO_IPV6
4c505f71 174
ba505322
AR
175static const char *ai_name(const struct addrinfo *ai)
176{
177 static char addr[INET_ADDRSTRLEN];
178 if ( AF_INET == ai->ai_family ) {
179 struct sockaddr_in *in;
180 in = (struct sockaddr_in *)ai->ai_addr;
181 inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
182 } else if ( AF_INET6 == ai->ai_family ) {
183 struct sockaddr_in6 *in;
184 in = (struct sockaddr_in6 *)ai->ai_addr;
185 inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
186 } else {
187 strcpy(addr, "(unknown)");
188 }
189 return addr;
190}
191
5ad312be
JL
192/*
193 * Returns a connected socket() fd, or else die()s.
194 */
7841ce79 195static int git_tcp_connect_sock(char *host, int flags)
2386d658 196{
ac3bc6c1 197 int sockfd = -1, saved_errno = 0;
5ba88448 198 char *colon, *end;
554fe20d 199 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
200 struct addrinfo hints, *ai0, *ai;
201 int gai;
ba505322 202 int cnt = 0;
5ba88448
YH
203
204 if (host[0] == '[') {
205 end = strchr(host + 1, ']');
206 if (end) {
207 *end = 0;
208 end++;
209 host++;
210 } else
211 end = host;
212 } else
213 end = host;
214 colon = strchr(end, ':');
215
ce6f8e7e
LT
216 if (colon) {
217 *colon = 0;
5ba88448 218 port = colon + 1;
608d48b2
LT
219 if (!*port)
220 port = "<none>";
ce6f8e7e 221 }
5ba88448
YH
222
223 memset(&hints, 0, sizeof(hints));
224 hints.ai_socktype = SOCK_STREAM;
225 hints.ai_protocol = IPPROTO_TCP;
226
7841ce79
MT
227 if (flags & CONNECT_VERBOSE)
228 fprintf(stderr, "Looking up %s ... ", host);
229
5ba88448
YH
230 gai = getaddrinfo(host, port, &hints, &ai);
231 if (gai)
608d48b2 232 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 233
7841ce79
MT
234 if (flags & CONNECT_VERBOSE)
235 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
236
5ba88448 237 for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be
JL
238 sockfd = socket(ai->ai_family,
239 ai->ai_socktype, ai->ai_protocol);
ac3bc6c1
PB
240 if (sockfd < 0) {
241 saved_errno = errno;
5ba88448 242 continue;
ac3bc6c1 243 }
5ba88448 244 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
ac3bc6c1 245 saved_errno = errno;
7cbf2f24 246 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322
AR
247 host,
248 cnt,
249 ai_name(ai),
ba505322 250 strerror(saved_errno));
5ba88448
YH
251 close(sockfd);
252 sockfd = -1;
253 continue;
2386d658 254 }
ba505322
AR
255 if (flags & CONNECT_VERBOSE)
256 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 257 break;
2386d658
LT
258 }
259
5ba88448 260 freeaddrinfo(ai0);
2386d658 261
2386d658 262 if (sockfd < 0)
ac3bc6c1 263 die("unable to connect a socket (%s)", strerror(saved_errno));
5ba88448 264
7841ce79
MT
265 if (flags & CONNECT_VERBOSE)
266 fprintf(stderr, "done.\n");
267
5ad312be 268 return sockfd;
2386d658
LT
269}
270
49744d63 271#else /* NO_IPV6 */
4c505f71 272
5ad312be
JL
273/*
274 * Returns a connected socket() fd, or else die()s.
275 */
7841ce79 276static int git_tcp_connect_sock(char *host, int flags)
4c505f71 277{
ac3bc6c1 278 int sockfd = -1, saved_errno = 0;
4c505f71
PA
279 char *colon, *end;
280 char *port = STR(DEFAULT_GIT_PORT), *ep;
281 struct hostent *he;
282 struct sockaddr_in sa;
283 char **ap;
284 unsigned int nport;
ba505322 285 int cnt;
4c505f71
PA
286
287 if (host[0] == '[') {
288 end = strchr(host + 1, ']');
289 if (end) {
290 *end = 0;
291 end++;
292 host++;
293 } else
294 end = host;
295 } else
296 end = host;
297 colon = strchr(end, ':');
298
299 if (colon) {
300 *colon = 0;
301 port = colon + 1;
302 }
303
7841ce79
MT
304 if (flags & CONNECT_VERBOSE)
305 fprintf(stderr, "Looking up %s ... ", host);
306
4c505f71
PA
307 he = gethostbyname(host);
308 if (!he)
309 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
310 nport = strtoul(port, &ep, 10);
311 if ( ep == port || *ep ) {
312 /* Not numeric */
313 struct servent *se = getservbyname(port,"tcp");
314 if ( !se )
315 die("Unknown port %s\n", port);
316 nport = se->s_port;
317 }
318
7841ce79
MT
319 if (flags & CONNECT_VERBOSE)
320 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
321
ba505322 322 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71 323 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
ac3bc6c1
PB
324 if (sockfd < 0) {
325 saved_errno = errno;
4c505f71 326 continue;
ac3bc6c1 327 }
4c505f71
PA
328
329 memset(&sa, 0, sizeof sa);
330 sa.sin_family = he->h_addrtype;
6573faff 331 sa.sin_port = htons(nport);
c6164218 332 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71
PA
333
334 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
ac3bc6c1 335 saved_errno = errno;
7cbf2f24 336 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322
AR
337 host,
338 cnt,
339 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
ba505322 340 strerror(saved_errno));
4c505f71
PA
341 close(sockfd);
342 sockfd = -1;
343 continue;
344 }
ba505322
AR
345 if (flags & CONNECT_VERBOSE)
346 fprintf(stderr, "%s ",
347 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
348 break;
349 }
350
351 if (sockfd < 0)
ac3bc6c1 352 die("unable to connect a socket (%s)", strerror(saved_errno));
4c505f71 353
7841ce79
MT
354 if (flags & CONNECT_VERBOSE)
355 fprintf(stderr, "done.\n");
356
5ad312be
JL
357 return sockfd;
358}
359
360#endif /* NO_IPV6 */
361
362
7841ce79 363static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 364{
7841ce79 365 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 366
4c505f71 367 fd[0] = sockfd;
ec587fde 368 fd[1] = dup(sockfd);
4c505f71
PA
369}
370
4c505f71 371
96f1e58f
DR
372static char *git_proxy_command;
373static const char *rhost_name;
e814bc4d 374static int rhost_len;
f8014776 375
ef90d6d4
JS
376static int git_proxy_command_options(const char *var, const char *value,
377 void *cb)
f8014776 378{
e814bc4d 379 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
380 const char *for_pos;
381 int matchlen = -1;
382 int hostlen;
383
e814bc4d 384 if (git_proxy_command)
f8014776 385 return 0;
c64b9ad0
JH
386 if (!value)
387 return config_error_nonbool(var);
e814bc4d
JH
388 /* [core]
389 * ;# matches www.kernel.org as well
390 * gitproxy = netcatter-1 for kernel.org
391 * gitproxy = netcatter-2 for sample.xz
392 * gitproxy = netcatter-default
393 */
c3df8568 394 for_pos = strstr(value, " for ");
e814bc4d
JH
395 if (!for_pos)
396 /* matches everybody */
397 matchlen = strlen(value);
398 else {
399 hostlen = strlen(for_pos + 5);
400 if (rhost_len < hostlen)
401 matchlen = -1;
402 else if (!strncmp(for_pos + 5,
403 rhost_name + rhost_len - hostlen,
404 hostlen) &&
405 ((rhost_len == hostlen) ||
406 rhost_name[rhost_len - hostlen -1] == '.'))
407 matchlen = for_pos - value;
408 else
409 matchlen = -1;
410 }
411 if (0 <= matchlen) {
412 /* core.gitproxy = none for kernel.org */
a6080a0a 413 if (matchlen == 4 &&
e814bc4d
JH
414 !memcmp(value, "none", 4))
415 matchlen = 0;
182af834 416 git_proxy_command = xmemdupz(value, matchlen);
f8014776 417 }
e814bc4d 418 return 0;
f8014776
PC
419 }
420
ef90d6d4 421 return git_default_config(var, value, cb);
f8014776
PC
422}
423
e814bc4d 424static int git_use_proxy(const char *host)
f8014776 425{
e814bc4d
JH
426 rhost_name = host;
427 rhost_len = strlen(host);
f8014776 428 git_proxy_command = getenv("GIT_PROXY_COMMAND");
ef90d6d4 429 git_config(git_proxy_command_options, NULL);
e814bc4d
JH
430 rhost_name = NULL;
431 return (git_proxy_command && *git_proxy_command);
f8014776
PC
432}
433
c78963d2 434static void git_proxy_connect(int fd[2], char *host)
f8014776 435{
554fe20d 436 const char *port = STR(DEFAULT_GIT_PORT);
f8014776 437 char *colon, *end;
15a1c012
SP
438 const char *argv[4];
439 struct child_process proxy;
f8014776
PC
440
441 if (host[0] == '[') {
442 end = strchr(host + 1, ']');
443 if (end) {
444 *end = 0;
445 end++;
446 host++;
447 } else
448 end = host;
449 } else
450 end = host;
451 colon = strchr(end, ':');
452
453 if (colon) {
454 *colon = 0;
455 port = colon + 1;
456 }
457
15a1c012
SP
458 argv[0] = git_proxy_command;
459 argv[1] = host;
460 argv[2] = port;
461 argv[3] = NULL;
462 memset(&proxy, 0, sizeof(proxy));
463 proxy.argv = argv;
464 proxy.in = -1;
465 proxy.out = -1;
466 if (start_command(&proxy))
467 die("cannot start proxy %s", argv[0]);
468 fd[0] = proxy.out; /* read from proxy stdout */
469 fd[1] = proxy.in; /* write to proxy stdin */
f8014776
PC
470}
471
0f503d77
CC
472#define MAX_CMD_LEN 1024
473
2e776665
LT
474char *get_port(char *host)
475{
476 char *end;
477 char *p = strchr(host, ':');
478
479 if (p) {
480 strtol(p+1, &end, 10);
481 if (*end == '\0') {
482 *p = '\0';
483 return p+1;
484 }
485 }
486
487 return NULL;
488}
489
fb32c917
JS
490static struct child_process no_fork;
491
f7192598 492/*
fb32c917
JS
493 * This returns a dummy child_process if the transport protocol does not
494 * need fork(2), or a struct child_process object if it does. Once done,
495 * finish the connection with finish_connect() with the value returned from
496 * this function (it is safe to call finish_connect() with NULL to support
497 * the former case).
f42a5c4e 498 *
fb32c917
JS
499 * If it returns, the connect is successful; it just dies on errors (this
500 * will hopefully be changed in a libification effort, to return NULL when
501 * the connection failed).
f7192598 502 */
4577370e 503struct child_process *git_connect(int fd[2], const char *url_orig,
98158e9c 504 const char *prog, int flags)
f7192598 505{
4577370e 506 char *url = xstrdup(url_orig);
faea9ccb 507 char *host, *path = url;
356bece0
YH
508 char *end;
509 int c;
98158e9c 510 struct child_process *conn;
faea9ccb 511 enum protocol protocol = PROTO_LOCAL;
da2a95b2 512 int free_path = 0;
2e776665 513 char *port = NULL;
f364cb88
JS
514 const char **arg;
515 struct strbuf cmd;
faea9ccb 516
f0b7367c
JH
517 /* Without this we cannot rely on waitpid() to tell
518 * what happened to our children.
519 */
520 signal(SIGCHLD, SIG_DFL);
521
faea9ccb
AE
522 host = strstr(url, "://");
523 if(host) {
524 *host = '\0';
525 protocol = get_protocol(url);
526 host += 3;
356bece0
YH
527 c = '/';
528 } else {
f7192598 529 host = url;
356bece0
YH
530 c = ':';
531 }
532
533 if (host[0] == '[') {
534 end = strchr(host + 1, ']');
535 if (end) {
536 *end = 0;
537 end++;
538 host++;
539 } else
540 end = host;
541 } else
542 end = host;
543
544 path = strchr(end, c);
be501813 545 if (path && !has_dos_drive_prefix(end)) {
72a4f4b6 546 if (c == ':') {
faea9ccb 547 protocol = PROTO_SSH;
356bece0 548 *path++ = '\0';
72a4f4b6
LT
549 }
550 } else
551 path = end;
2386d658 552
faea9ccb
AE
553 if (!path || !*path)
554 die("No path specified. See 'man git-pull' for valid url syntax");
555
556 /*
557 * null-terminate hostname and point path to ~ for URL's like this:
558 * ssh://host.xz/~user/repo
559 */
560 if (protocol != PROTO_LOCAL && host != url) {
561 char *ptr = path;
562 if (path[1] == '~')
563 path++;
da2a95b2 564 else {
9befac47 565 path = xstrdup(ptr);
da2a95b2
SH
566 free_path = 1;
567 }
faea9ccb
AE
568
569 *ptr = '\0';
570 }
571
2e776665
LT
572 /*
573 * Add support for ssh port: ssh://host.xy:<port>/...
574 */
575 if (protocol == PROTO_SSH && host != url)
576 port = get_port(host);
577
f8014776 578 if (protocol == PROTO_GIT) {
5ad312be
JL
579 /* These underlying connection commands die() if they
580 * cannot connect.
581 */
9befac47 582 char *target_host = xstrdup(host);
e814bc4d 583 if (git_use_proxy(host))
c78963d2 584 git_proxy_connect(fd, host);
da2a95b2 585 else
7841ce79 586 git_tcp_connect(fd, host, flags);
5ad312be
JL
587 /*
588 * Separate original protocol components prog and path
589 * from extended components with a NUL byte.
590 */
591 packet_write(fd[1],
592 "%s %s%chost=%s%c",
593 prog, path, 0,
594 target_host, 0);
595 free(target_host);
4577370e 596 free(url);
da2a95b2
SH
597 if (free_path)
598 free(path);
fb32c917 599 return &no_fork;
f8014776 600 }
2386d658 601
98158e9c 602 conn = xcalloc(1, sizeof(*conn));
2e776665 603
f364cb88
JS
604 strbuf_init(&cmd, MAX_CMD_LEN);
605 strbuf_addstr(&cmd, prog);
606 strbuf_addch(&cmd, ' ');
607 sq_quote_buf(&cmd, path);
608 if (cmd.len >= MAX_CMD_LEN)
609 die("command line too long");
610
611 conn->in = conn->out = -1;
612 conn->argv = arg = xcalloc(6, sizeof(*arg));
613 if (protocol == PROTO_SSH) {
614 const char *ssh = getenv("GIT_SSH");
615 if (!ssh) ssh = "ssh";
616
617 *arg++ = ssh;
618 if (port) {
619 *arg++ = "-p";
620 *arg++ = port;
4852f723 621 }
f364cb88
JS
622 *arg++ = host;
623 }
624 else {
625 /* remove these from the environment */
626 const char *env[] = {
627 ALTERNATE_DB_ENVIRONMENT,
628 DB_ENVIRONMENT,
629 GIT_DIR_ENVIRONMENT,
630 GIT_WORK_TREE_ENVIRONMENT,
631 GRAFT_ENVIRONMENT,
632 INDEX_ENVIRONMENT,
633 NULL
634 };
635 conn->env = env;
636 *arg++ = "sh";
637 *arg++ = "-c";
016fb48b 638 }
f364cb88
JS
639 *arg++ = cmd.buf;
640 *arg = NULL;
641
642 if (start_command(conn))
643 die("unable to fork");
644
645 fd[0] = conn->out; /* read from child's stdout */
646 fd[1] = conn->in; /* write to child's stdin */
647 strbuf_release(&cmd);
4577370e 648 free(url);
da2a95b2
SH
649 if (free_path)
650 free(path);
98158e9c 651 return conn;
f7192598
LT
652}
653
98158e9c 654int finish_connect(struct child_process *conn)
f7192598 655{
f364cb88 656 int code;
fb32c917 657 if (!conn || conn == &no_fork)
f42a5c4e
FBH
658 return 0;
659
f364cb88
JS
660 code = finish_command(conn);
661 free(conn->argv);
98158e9c 662 free(conn);
f364cb88 663 return code;
f7192598 664}