Merge commit 'git/master'
[git/git-bigfiles.git] / connect.c
blob7636bf976e78a6622281501af2dcc0135781f60a
1 #include "git-compat-util.h"
2 #include "cache.h"
3 #include "pkt-line.h"
4 #include "quote.h"
5 #include "refs.h"
6 #include "run-command.h"
7 #include "remote.h"
9 static char *server_capabilities;
11 static int check_ref(const char *name, int len, unsigned int flags)
13 if (!flags)
14 return 1;
16 if (len < 5 || memcmp(name, "refs/", 5))
17 return 0;
19 /* Skip the "refs/" part */
20 name += 5;
21 len -= 5;
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;
27 /* REF_HEADS means that we want regular branch heads */
28 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
29 return 1;
31 /* REF_TAGS means that we want tags */
32 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
33 return 1;
35 /* All type bits clear means that we are ok with anything */
36 return !(flags & ~REF_NORMAL);
39 int check_ref_type(const struct ref *ref, int flags)
41 return check_ref(ref->name, strlen(ref->name), flags);
44 static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
46 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
47 hashcpy(&(extra->array[extra->nr][0]), sha1);
48 extra->nr++;
52 * Read all the refs from the other end
54 struct ref **get_remote_heads(int in, struct ref **list,
55 int nr_match, char **match,
56 unsigned int flags,
57 struct extra_have_objects *extra_have)
59 *list = NULL;
60 for (;;) {
61 struct ref *ref;
62 unsigned char old_sha1[20];
63 static char buffer[1000];
64 char *name;
65 int len, name_len;
67 len = packet_read_line(in, buffer, sizeof(buffer));
68 if (!len)
69 break;
70 if (buffer[len-1] == '\n')
71 buffer[--len] = 0;
73 if (len > 4 && !prefixcmp(buffer, "ERR "))
74 die("remote error: %s", buffer + 4);
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;
80 name_len = strlen(name);
81 if (len != name_len + 41) {
82 free(server_capabilities);
83 server_capabilities = xstrdup(name + name_len + 1);
86 if (extra_have &&
87 name_len == 5 && !memcmp(".have", name, 5)) {
88 add_extra_have(extra_have, old_sha1);
89 continue;
92 if (!check_ref(name, name_len, flags))
93 continue;
94 if (nr_match && !path_match(name, nr_match, match))
95 continue;
96 ref = alloc_ref(buffer + 41);
97 hashcpy(ref->old_sha1, old_sha1);
98 *list = ref;
99 list = &ref->next;
101 return list;
104 int server_supports(const char *feature)
106 return server_capabilities &&
107 strstr(server_capabilities, feature) != NULL;
110 int get_ack(int fd, unsigned char *result_sha1)
112 static char line[1000];
113 int len = packet_read_line(fd, line, sizeof(line));
115 if (!len)
116 die("git fetch-pack: expected ACK/NAK, got EOF");
117 if (line[len-1] == '\n')
118 line[--len] = 0;
119 if (!strcmp(line, "NAK"))
120 return 0;
121 if (!prefixcmp(line, "ACK ")) {
122 if (!get_sha1_hex(line+4, result_sha1)) {
123 if (strstr(line+45, "continue"))
124 return 2;
125 return 1;
128 die("git fetch_pack: expected ACK/NAK, got '%s'", line);
131 int path_match(const char *path, int nr, char **match)
133 int i;
134 int pathlen = strlen(path);
136 for (i = 0; i < nr; i++) {
137 char *s = match[i];
138 int len = strlen(s);
140 if (!len || len > pathlen)
141 continue;
142 if (memcmp(path + pathlen - len, s, len))
143 continue;
144 if (pathlen > len && path[pathlen - len - 1] != '/')
145 continue;
146 *s = 0;
147 return (i + 1);
149 return 0;
152 enum protocol {
153 PROTO_LOCAL = 1,
154 PROTO_SSH,
155 PROTO_GIT,
158 static enum protocol get_protocol(const char *name)
160 if (!strcmp(name, "ssh"))
161 return PROTO_SSH;
162 if (!strcmp(name, "git"))
163 return PROTO_GIT;
164 if (!strcmp(name, "git+ssh"))
165 return PROTO_SSH;
166 if (!strcmp(name, "ssh+git"))
167 return PROTO_SSH;
168 if (!strcmp(name, "file"))
169 return PROTO_LOCAL;
170 die("I don't handle protocol '%s'", name);
173 #define STR_(s) # s
174 #define STR(s) STR_(s)
176 #ifndef NO_IPV6
178 static const char *ai_name(const struct addrinfo *ai)
180 static char addr[INET_ADDRSTRLEN];
181 if ( AF_INET == ai->ai_family ) {
182 struct sockaddr_in *in;
183 in = (struct sockaddr_in *)ai->ai_addr;
184 inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
185 } else if ( AF_INET6 == ai->ai_family ) {
186 struct sockaddr_in6 *in;
187 in = (struct sockaddr_in6 *)ai->ai_addr;
188 inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
189 } else {
190 strcpy(addr, "(unknown)");
192 return addr;
196 * Returns a connected socket() fd, or else die()s.
198 static int git_tcp_connect_sock(char *host, int flags)
200 int sockfd = -1, saved_errno = 0;
201 char *colon, *end;
202 const char *port = STR(DEFAULT_GIT_PORT);
203 struct addrinfo hints, *ai0, *ai;
204 int gai;
205 int cnt = 0;
207 if (host[0] == '[') {
208 end = strchr(host + 1, ']');
209 if (end) {
210 *end = 0;
211 end++;
212 host++;
213 } else
214 end = host;
215 } else
216 end = host;
217 colon = strchr(end, ':');
219 if (colon) {
220 *colon = 0;
221 port = colon + 1;
222 if (!*port)
223 port = "<none>";
226 memset(&hints, 0, sizeof(hints));
227 hints.ai_socktype = SOCK_STREAM;
228 hints.ai_protocol = IPPROTO_TCP;
230 if (flags & CONNECT_VERBOSE)
231 fprintf(stderr, "Looking up %s ... ", host);
233 gai = getaddrinfo(host, port, &hints, &ai);
234 if (gai)
235 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
237 if (flags & CONNECT_VERBOSE)
238 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
240 for (ai0 = ai; ai; ai = ai->ai_next) {
241 sockfd = socket(ai->ai_family,
242 ai->ai_socktype, ai->ai_protocol);
243 if (sockfd < 0) {
244 saved_errno = errno;
245 continue;
247 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
248 saved_errno = errno;
249 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
250 host,
251 cnt,
252 ai_name(ai),
253 strerror(saved_errno));
254 close(sockfd);
255 sockfd = -1;
256 continue;
258 if (flags & CONNECT_VERBOSE)
259 fprintf(stderr, "%s ", ai_name(ai));
260 break;
263 freeaddrinfo(ai0);
265 if (sockfd < 0)
266 die("unable to connect a socket (%s)", strerror(saved_errno));
268 if (flags & CONNECT_VERBOSE)
269 fprintf(stderr, "done.\n");
271 return sockfd;
274 #else /* NO_IPV6 */
277 * Returns a connected socket() fd, or else die()s.
279 static int git_tcp_connect_sock(char *host, int flags)
281 int sockfd = -1, saved_errno = 0;
282 char *colon, *end;
283 char *port = STR(DEFAULT_GIT_PORT), *ep;
284 struct hostent *he;
285 struct sockaddr_in sa;
286 char **ap;
287 unsigned int nport;
288 int cnt;
290 if (host[0] == '[') {
291 end = strchr(host + 1, ']');
292 if (end) {
293 *end = 0;
294 end++;
295 host++;
296 } else
297 end = host;
298 } else
299 end = host;
300 colon = strchr(end, ':');
302 if (colon) {
303 *colon = 0;
304 port = colon + 1;
307 if (flags & CONNECT_VERBOSE)
308 fprintf(stderr, "Looking up %s ... ", host);
310 he = gethostbyname(host);
311 if (!he)
312 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
313 nport = strtoul(port, &ep, 10);
314 if ( ep == port || *ep ) {
315 /* Not numeric */
316 struct servent *se = getservbyname(port,"tcp");
317 if ( !se )
318 die("Unknown port %s", port);
319 nport = se->s_port;
322 if (flags & CONNECT_VERBOSE)
323 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
325 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
326 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
327 if (sockfd < 0) {
328 saved_errno = errno;
329 continue;
332 memset(&sa, 0, sizeof sa);
333 sa.sin_family = he->h_addrtype;
334 sa.sin_port = htons(nport);
335 memcpy(&sa.sin_addr, *ap, he->h_length);
337 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
338 saved_errno = errno;
339 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
340 host,
341 cnt,
342 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
343 strerror(saved_errno));
344 close(sockfd);
345 sockfd = -1;
346 continue;
348 if (flags & CONNECT_VERBOSE)
349 fprintf(stderr, "%s ",
350 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
351 break;
354 if (sockfd < 0)
355 die("unable to connect a socket (%s)", strerror(saved_errno));
357 if (flags & CONNECT_VERBOSE)
358 fprintf(stderr, "done.\n");
360 return sockfd;
363 #endif /* NO_IPV6 */
366 static void git_tcp_connect(int fd[2], char *host, int flags)
368 int sockfd = git_tcp_connect_sock(host, flags);
370 fd[0] = sockfd;
371 fd[1] = dup(sockfd);
375 static char *git_proxy_command;
377 static int git_proxy_command_options(const char *var, const char *value,
378 void *cb)
380 if (!strcmp(var, "core.gitproxy")) {
381 const char *for_pos;
382 int matchlen = -1;
383 int hostlen;
384 const char *rhost_name = cb;
385 int rhost_len = strlen(rhost_name);
387 if (git_proxy_command)
388 return 0;
389 if (!value)
390 return config_error_nonbool(var);
391 /* [core]
392 * ;# matches www.kernel.org as well
393 * gitproxy = netcatter-1 for kernel.org
394 * gitproxy = netcatter-2 for sample.xz
395 * gitproxy = netcatter-default
397 for_pos = strstr(value, " for ");
398 if (!for_pos)
399 /* matches everybody */
400 matchlen = strlen(value);
401 else {
402 hostlen = strlen(for_pos + 5);
403 if (rhost_len < hostlen)
404 matchlen = -1;
405 else if (!strncmp(for_pos + 5,
406 rhost_name + rhost_len - hostlen,
407 hostlen) &&
408 ((rhost_len == hostlen) ||
409 rhost_name[rhost_len - hostlen -1] == '.'))
410 matchlen = for_pos - value;
411 else
412 matchlen = -1;
414 if (0 <= matchlen) {
415 /* core.gitproxy = none for kernel.org */
416 if (matchlen == 4 &&
417 !memcmp(value, "none", 4))
418 matchlen = 0;
419 git_proxy_command = xmemdupz(value, matchlen);
421 return 0;
424 return git_default_config(var, value, cb);
427 static int git_use_proxy(const char *host)
429 git_proxy_command = getenv("GIT_PROXY_COMMAND");
430 git_config(git_proxy_command_options, (void*)host);
431 return (git_proxy_command && *git_proxy_command);
434 static void git_proxy_connect(int fd[2], char *host)
436 const char *port = STR(DEFAULT_GIT_PORT);
437 char *colon, *end;
438 const char *argv[4];
439 struct child_process proxy;
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, ':');
453 if (colon) {
454 *colon = 0;
455 port = colon + 1;
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 */
472 #define MAX_CMD_LEN 1024
474 char *get_port(char *host)
476 char *end;
477 char *p = strchr(host, ':');
479 if (p) {
480 long port = strtol(p + 1, &end, 10);
481 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
482 *p = '\0';
483 return p+1;
487 return NULL;
490 static struct child_process no_fork;
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).
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).
503 struct child_process *git_connect(int fd[2], const char *url_orig,
504 const char *prog, int flags)
506 char *url = xstrdup(url_orig);
507 char *host, *path;
508 char *end;
509 int c;
510 struct child_process *conn;
511 enum protocol protocol = PROTO_LOCAL;
512 int free_path = 0;
513 char *port = NULL;
514 const char **arg;
515 struct strbuf cmd;
517 /* Without this we cannot rely on waitpid() to tell
518 * what happened to our children.
520 signal(SIGCHLD, SIG_DFL);
522 host = strstr(url, "://");
523 if(host) {
524 *host = '\0';
525 protocol = get_protocol(url);
526 host += 3;
527 c = '/';
528 } else {
529 host = url;
530 c = ':';
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;
544 path = strchr(end, c);
545 if (path && !has_dos_drive_prefix(end)) {
546 if (c == ':') {
547 protocol = PROTO_SSH;
548 *path++ = '\0';
550 } else
551 path = end;
553 if (!path || !*path)
554 die("No path specified. See 'man git-pull' for valid url syntax");
557 * null-terminate hostname and point path to ~ for URL's like this:
558 * ssh://host.xz/~user/repo
560 if (protocol != PROTO_LOCAL && host != url) {
561 char *ptr = path;
562 if (path[1] == '~')
563 path++;
564 else {
565 path = xstrdup(ptr);
566 free_path = 1;
569 *ptr = '\0';
573 * Add support for ssh port: ssh://host.xy:<port>/...
575 if (protocol == PROTO_SSH && host != url)
576 port = get_port(host);
578 if (protocol == PROTO_GIT) {
579 /* These underlying connection commands die() if they
580 * cannot connect.
582 char *target_host = xstrdup(host);
583 if (git_use_proxy(host))
584 git_proxy_connect(fd, host);
585 else
586 git_tcp_connect(fd, host, flags);
588 * Separate original protocol components prog and path
589 * from extended components with a NUL byte.
591 packet_write(fd[1],
592 "%s %s%chost=%s%c",
593 prog, path, 0,
594 target_host, 0);
595 free(target_host);
596 free(url);
597 if (free_path)
598 free(path);
599 return &no_fork;
602 conn = xcalloc(1, sizeof(*conn));
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");
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";
617 *arg++ = ssh;
618 if (port) {
619 *arg++ = "-p";
620 *arg++ = port;
622 *arg++ = host;
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
635 conn->env = env;
636 *arg++ = "sh";
637 *arg++ = "-c";
639 *arg++ = cmd.buf;
640 *arg = NULL;
642 if (start_command(conn))
643 die("unable to fork");
645 fd[0] = conn->out; /* read from child's stdout */
646 fd[1] = conn->in; /* write to child's stdin */
647 strbuf_release(&cmd);
648 free(url);
649 if (free_path)
650 free(path);
651 return conn;
654 int finish_connect(struct child_process *conn)
656 int code;
657 if (!conn || conn == &no_fork)
658 return 0;
660 code = finish_command(conn);
661 free(conn->argv);
662 free(conn);
663 return code;