Merge commit 'refs/top-bases/girocco' into girocco
[git/repo.git] / connect.c
blob67d2cd86a89a92f8f75baa7ae5e820ac3150f3b4
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 < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
74 die("protocol error: expected sha/ref, got '%s'", buffer);
75 name = buffer + 41;
77 name_len = strlen(name);
78 if (len != name_len + 41) {
79 free(server_capabilities);
80 server_capabilities = xstrdup(name + name_len + 1);
83 if (extra_have &&
84 name_len == 5 && !memcmp(".have", name, 5)) {
85 add_extra_have(extra_have, old_sha1);
86 continue;
89 if (!check_ref(name, name_len, flags))
90 continue;
91 if (nr_match && !path_match(name, nr_match, match))
92 continue;
93 ref = alloc_ref(name_len + 1);
94 hashcpy(ref->old_sha1, old_sha1);
95 memcpy(ref->name, buffer + 41, name_len + 1);
96 *list = ref;
97 list = &ref->next;
99 return list;
102 int server_supports(const char *feature)
104 return server_capabilities &&
105 strstr(server_capabilities, feature) != NULL;
108 int get_ack(int fd, unsigned char *result_sha1)
110 static char line[1000];
111 int len = packet_read_line(fd, line, sizeof(line));
113 if (!len)
114 die("git fetch-pack: expected ACK/NAK, got EOF");
115 if (line[len-1] == '\n')
116 line[--len] = 0;
117 if (!strcmp(line, "NAK"))
118 return 0;
119 if (!prefixcmp(line, "ACK ")) {
120 if (!get_sha1_hex(line+4, result_sha1)) {
121 if (strstr(line+45, "continue"))
122 return 2;
123 return 1;
126 die("git fetch_pack: expected ACK/NAK, got '%s'", line);
129 int path_match(const char *path, int nr, char **match)
131 int i;
132 int pathlen = strlen(path);
134 for (i = 0; i < nr; i++) {
135 char *s = match[i];
136 int len = strlen(s);
138 if (!len || len > pathlen)
139 continue;
140 if (memcmp(path + pathlen - len, s, len))
141 continue;
142 if (pathlen > len && path[pathlen - len - 1] != '/')
143 continue;
144 *s = 0;
145 return (i + 1);
147 return 0;
150 enum protocol {
151 PROTO_LOCAL = 1,
152 PROTO_SSH,
153 PROTO_GIT,
156 static enum protocol get_protocol(const char *name)
158 if (!strcmp(name, "ssh"))
159 return PROTO_SSH;
160 if (!strcmp(name, "git"))
161 return PROTO_GIT;
162 if (!strcmp(name, "git+ssh"))
163 return PROTO_SSH;
164 if (!strcmp(name, "ssh+git"))
165 return PROTO_SSH;
166 if (!strcmp(name, "file"))
167 return PROTO_LOCAL;
168 die("I don't handle protocol '%s'", name);
171 #define STR_(s) # s
172 #define STR(s) STR_(s)
174 #ifndef NO_IPV6
176 static const char *ai_name(const struct addrinfo *ai)
178 static char addr[INET_ADDRSTRLEN];
179 if ( AF_INET == ai->ai_family ) {
180 struct sockaddr_in *in;
181 in = (struct sockaddr_in *)ai->ai_addr;
182 inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
183 } else if ( AF_INET6 == ai->ai_family ) {
184 struct sockaddr_in6 *in;
185 in = (struct sockaddr_in6 *)ai->ai_addr;
186 inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
187 } else {
188 strcpy(addr, "(unknown)");
190 return addr;
194 * Returns a connected socket() fd, or else die()s.
196 static int git_tcp_connect_sock(char *host, int flags)
198 int sockfd = -1, saved_errno = 0;
199 char *colon, *end;
200 const char *port = STR(DEFAULT_GIT_PORT);
201 struct addrinfo hints, *ai0, *ai;
202 int gai;
203 int cnt = 0;
205 if (host[0] == '[') {
206 end = strchr(host + 1, ']');
207 if (end) {
208 *end = 0;
209 end++;
210 host++;
211 } else
212 end = host;
213 } else
214 end = host;
215 colon = strchr(end, ':');
217 if (colon) {
218 *colon = 0;
219 port = colon + 1;
220 if (!*port)
221 port = "<none>";
224 memset(&hints, 0, sizeof(hints));
225 hints.ai_socktype = SOCK_STREAM;
226 hints.ai_protocol = IPPROTO_TCP;
228 if (flags & CONNECT_VERBOSE)
229 fprintf(stderr, "Looking up %s ... ", host);
231 gai = getaddrinfo(host, port, &hints, &ai);
232 if (gai)
233 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
235 if (flags & CONNECT_VERBOSE)
236 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
238 for (ai0 = ai; ai; ai = ai->ai_next) {
239 sockfd = socket(ai->ai_family,
240 ai->ai_socktype, ai->ai_protocol);
241 if (sockfd < 0) {
242 saved_errno = errno;
243 continue;
245 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
246 saved_errno = errno;
247 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
248 host,
249 cnt,
250 ai_name(ai),
251 strerror(saved_errno));
252 close(sockfd);
253 sockfd = -1;
254 continue;
256 if (flags & CONNECT_VERBOSE)
257 fprintf(stderr, "%s ", ai_name(ai));
258 break;
261 freeaddrinfo(ai0);
263 if (sockfd < 0)
264 die("unable to connect a socket (%s)", strerror(saved_errno));
266 if (flags & CONNECT_VERBOSE)
267 fprintf(stderr, "done.\n");
269 return sockfd;
272 #else /* NO_IPV6 */
275 * Returns a connected socket() fd, or else die()s.
277 static int git_tcp_connect_sock(char *host, int flags)
279 int sockfd = -1, saved_errno = 0;
280 char *colon, *end;
281 char *port = STR(DEFAULT_GIT_PORT), *ep;
282 struct hostent *he;
283 struct sockaddr_in sa;
284 char **ap;
285 unsigned int nport;
286 int cnt;
288 if (host[0] == '[') {
289 end = strchr(host + 1, ']');
290 if (end) {
291 *end = 0;
292 end++;
293 host++;
294 } else
295 end = host;
296 } else
297 end = host;
298 colon = strchr(end, ':');
300 if (colon) {
301 *colon = 0;
302 port = colon + 1;
305 if (flags & CONNECT_VERBOSE)
306 fprintf(stderr, "Looking up %s ... ", host);
308 he = gethostbyname(host);
309 if (!he)
310 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
311 nport = strtoul(port, &ep, 10);
312 if ( ep == port || *ep ) {
313 /* Not numeric */
314 struct servent *se = getservbyname(port,"tcp");
315 if ( !se )
316 die("Unknown port %s\n", port);
317 nport = se->s_port;
320 if (flags & CONNECT_VERBOSE)
321 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
323 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
324 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
325 if (sockfd < 0) {
326 saved_errno = errno;
327 continue;
330 memset(&sa, 0, sizeof sa);
331 sa.sin_family = he->h_addrtype;
332 sa.sin_port = htons(nport);
333 memcpy(&sa.sin_addr, *ap, he->h_length);
335 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
336 saved_errno = errno;
337 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
338 host,
339 cnt,
340 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
341 strerror(saved_errno));
342 close(sockfd);
343 sockfd = -1;
344 continue;
346 if (flags & CONNECT_VERBOSE)
347 fprintf(stderr, "%s ",
348 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
349 break;
352 if (sockfd < 0)
353 die("unable to connect a socket (%s)", strerror(saved_errno));
355 if (flags & CONNECT_VERBOSE)
356 fprintf(stderr, "done.\n");
358 return sockfd;
361 #endif /* NO_IPV6 */
364 static void git_tcp_connect(int fd[2], char *host, int flags)
366 int sockfd = git_tcp_connect_sock(host, flags);
368 fd[0] = sockfd;
369 fd[1] = dup(sockfd);
373 static char *git_proxy_command;
374 static const char *rhost_name;
375 static int rhost_len;
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;
385 if (git_proxy_command)
386 return 0;
387 if (!value)
388 return config_error_nonbool(var);
389 /* [core]
390 * ;# matches www.kernel.org as well
391 * gitproxy = netcatter-1 for kernel.org
392 * gitproxy = netcatter-2 for sample.xz
393 * gitproxy = netcatter-default
395 for_pos = strstr(value, " for ");
396 if (!for_pos)
397 /* matches everybody */
398 matchlen = strlen(value);
399 else {
400 hostlen = strlen(for_pos + 5);
401 if (rhost_len < hostlen)
402 matchlen = -1;
403 else if (!strncmp(for_pos + 5,
404 rhost_name + rhost_len - hostlen,
405 hostlen) &&
406 ((rhost_len == hostlen) ||
407 rhost_name[rhost_len - hostlen -1] == '.'))
408 matchlen = for_pos - value;
409 else
410 matchlen = -1;
412 if (0 <= matchlen) {
413 /* core.gitproxy = none for kernel.org */
414 if (matchlen == 4 &&
415 !memcmp(value, "none", 4))
416 matchlen = 0;
417 git_proxy_command = xmemdupz(value, matchlen);
419 return 0;
422 return git_default_config(var, value, cb);
425 static int git_use_proxy(const char *host)
427 rhost_name = host;
428 rhost_len = strlen(host);
429 git_proxy_command = getenv("GIT_PROXY_COMMAND");
430 git_config(git_proxy_command_options, NULL);
431 rhost_name = NULL;
432 return (git_proxy_command && *git_proxy_command);
435 static void git_proxy_connect(int fd[2], char *host)
437 const char *port = STR(DEFAULT_GIT_PORT);
438 char *colon, *end;
439 const char *argv[4];
440 struct child_process proxy;
442 if (host[0] == '[') {
443 end = strchr(host + 1, ']');
444 if (end) {
445 *end = 0;
446 end++;
447 host++;
448 } else
449 end = host;
450 } else
451 end = host;
452 colon = strchr(end, ':');
454 if (colon) {
455 *colon = 0;
456 port = colon + 1;
459 argv[0] = git_proxy_command;
460 argv[1] = host;
461 argv[2] = port;
462 argv[3] = NULL;
463 memset(&proxy, 0, sizeof(proxy));
464 proxy.argv = argv;
465 proxy.in = -1;
466 proxy.out = -1;
467 if (start_command(&proxy))
468 die("cannot start proxy %s", argv[0]);
469 fd[0] = proxy.out; /* read from proxy stdout */
470 fd[1] = proxy.in; /* write to proxy stdin */
473 #define MAX_CMD_LEN 1024
475 char *get_port(char *host)
477 char *end;
478 char *p = strchr(host, ':');
480 if (p) {
481 strtol(p+1, &end, 10);
482 if (*end == '\0') {
483 *p = '\0';
484 return p+1;
488 return NULL;
491 static struct child_process no_fork;
494 * This returns a dummy child_process if the transport protocol does not
495 * need fork(2), or a struct child_process object if it does. Once done,
496 * finish the connection with finish_connect() with the value returned from
497 * this function (it is safe to call finish_connect() with NULL to support
498 * the former case).
500 * If it returns, the connect is successful; it just dies on errors (this
501 * will hopefully be changed in a libification effort, to return NULL when
502 * the connection failed).
504 struct child_process *git_connect(int fd[2], const char *url_orig,
505 const char *prog, int flags)
507 char *url = xstrdup(url_orig);
508 char *host, *path = url;
509 char *end;
510 int c;
511 struct child_process *conn;
512 enum protocol protocol = PROTO_LOCAL;
513 int free_path = 0;
514 char *port = NULL;
515 const char **arg;
516 struct strbuf cmd;
518 /* Without this we cannot rely on waitpid() to tell
519 * what happened to our children.
521 signal(SIGCHLD, SIG_DFL);
523 host = strstr(url, "://");
524 if(host) {
525 *host = '\0';
526 protocol = get_protocol(url);
527 host += 3;
528 c = '/';
529 } else {
530 host = url;
531 c = ':';
534 if (host[0] == '[') {
535 end = strchr(host + 1, ']');
536 if (end) {
537 *end = 0;
538 end++;
539 host++;
540 } else
541 end = host;
542 } else
543 end = host;
545 path = strchr(end, c);
546 if (path && !has_dos_drive_prefix(end)) {
547 if (c == ':') {
548 protocol = PROTO_SSH;
549 *path++ = '\0';
551 } else
552 path = end;
554 if (!path || !*path)
555 die("No path specified. See 'man git-pull' for valid url syntax");
558 * null-terminate hostname and point path to ~ for URL's like this:
559 * ssh://host.xz/~user/repo
561 if (protocol != PROTO_LOCAL && host != url) {
562 char *ptr = path;
563 if (path[1] == '~')
564 path++;
565 else {
566 path = xstrdup(ptr);
567 free_path = 1;
570 *ptr = '\0';
574 * Add support for ssh port: ssh://host.xy:<port>/...
576 if (protocol == PROTO_SSH && host != url)
577 port = get_port(host);
579 if (protocol == PROTO_GIT) {
580 /* These underlying connection commands die() if they
581 * cannot connect.
583 char *target_host = xstrdup(host);
584 if (git_use_proxy(host))
585 git_proxy_connect(fd, host);
586 else
587 git_tcp_connect(fd, host, flags);
589 * Separate original protocol components prog and path
590 * from extended components with a NUL byte.
592 packet_write(fd[1],
593 "%s %s%chost=%s%c",
594 prog, path, 0,
595 target_host, 0);
596 free(target_host);
597 free(url);
598 if (free_path)
599 free(path);
600 return &no_fork;
603 conn = xcalloc(1, sizeof(*conn));
605 strbuf_init(&cmd, MAX_CMD_LEN);
606 strbuf_addstr(&cmd, prog);
607 strbuf_addch(&cmd, ' ');
608 sq_quote_buf(&cmd, path);
609 if (cmd.len >= MAX_CMD_LEN)
610 die("command line too long");
612 conn->in = conn->out = -1;
613 conn->argv = arg = xcalloc(6, sizeof(*arg));
614 if (protocol == PROTO_SSH) {
615 const char *ssh = getenv("GIT_SSH");
616 if (!ssh) ssh = "ssh";
618 *arg++ = ssh;
619 if (port) {
620 *arg++ = "-p";
621 *arg++ = port;
623 *arg++ = host;
625 else {
626 /* remove these from the environment */
627 const char *env[] = {
628 ALTERNATE_DB_ENVIRONMENT,
629 DB_ENVIRONMENT,
630 GIT_DIR_ENVIRONMENT,
631 GIT_WORK_TREE_ENVIRONMENT,
632 GRAFT_ENVIRONMENT,
633 INDEX_ENVIRONMENT,
634 NULL
636 conn->env = env;
637 *arg++ = "sh";
638 *arg++ = "-c";
640 *arg++ = cmd.buf;
641 *arg = NULL;
643 if (start_command(conn))
644 die("unable to fork");
646 fd[0] = conn->out; /* read from child's stdout */
647 fd[1] = conn->in; /* write to child's stdin */
648 strbuf_release(&cmd);
649 free(url);
650 if (free_path)
651 free(path);
652 return conn;
655 int finish_connect(struct child_process *conn)
657 int code;
658 if (!conn || conn == &no_fork)
659 return 0;
661 code = finish_command(conn);
662 free(conn->argv);
663 free(conn);
664 return code;