Documentation/githooks: Fix linkgit
[git.git] / connect.c
blob49e56ba35a645359b0d7c1f7bbc9e2108b3424d9
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"
8 #include "url.h"
10 static char *server_capabilities;
12 static int check_ref(const char *name, int len, unsigned int flags)
14 if (!flags)
15 return 1;
17 if (len < 5 || memcmp(name, "refs/", 5))
18 return 0;
20 /* Skip the "refs/" part */
21 name += 5;
22 len -= 5;
24 /* REF_NORMAL means that we don't want the magic fake tag refs */
25 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
26 return 0;
28 /* REF_HEADS means that we want regular branch heads */
29 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
30 return 1;
32 /* REF_TAGS means that we want tags */
33 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
34 return 1;
36 /* All type bits clear means that we are ok with anything */
37 return !(flags & ~REF_NORMAL);
40 int check_ref_type(const struct ref *ref, int flags)
42 return check_ref(ref->name, strlen(ref->name), flags);
45 static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
47 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
48 hashcpy(&(extra->array[extra->nr][0]), sha1);
49 extra->nr++;
52 static void die_initial_contact(int got_at_least_one_head)
54 if (got_at_least_one_head)
55 die("The remote end hung up upon initial contact");
56 else
57 die("Could not read from remote repository.\n\n"
58 "Please make sure you have the correct access rights\n"
59 "and the repository exists.");
63 * Read all the refs from the other end
65 struct ref **get_remote_heads(int in, struct ref **list,
66 unsigned int flags,
67 struct extra_have_objects *extra_have)
69 int got_at_least_one_head = 0;
71 *list = NULL;
72 for (;;) {
73 struct ref *ref;
74 unsigned char old_sha1[20];
75 static char buffer[1000];
76 char *name;
77 int len, name_len;
79 len = packet_read(in, buffer, sizeof(buffer));
80 if (len < 0)
81 die_initial_contact(got_at_least_one_head);
83 if (!len)
84 break;
85 if (buffer[len-1] == '\n')
86 buffer[--len] = 0;
88 if (len > 4 && !prefixcmp(buffer, "ERR "))
89 die("remote error: %s", buffer + 4);
91 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
92 die("protocol error: expected sha/ref, got '%s'", buffer);
93 name = buffer + 41;
95 name_len = strlen(name);
96 if (len != name_len + 41) {
97 free(server_capabilities);
98 server_capabilities = xstrdup(name + name_len + 1);
101 if (extra_have &&
102 name_len == 5 && !memcmp(".have", name, 5)) {
103 add_extra_have(extra_have, old_sha1);
104 continue;
107 if (!check_ref(name, name_len, flags))
108 continue;
109 ref = alloc_ref(buffer + 41);
110 hashcpy(ref->old_sha1, old_sha1);
111 *list = ref;
112 list = &ref->next;
113 got_at_least_one_head = 1;
115 return list;
118 const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
120 int len;
122 if (!feature_list)
123 return NULL;
125 len = strlen(feature);
126 while (*feature_list) {
127 const char *found = strstr(feature_list, feature);
128 if (!found)
129 return NULL;
130 if (feature_list == found || isspace(found[-1])) {
131 const char *value = found + len;
132 /* feature with no value (e.g., "thin-pack") */
133 if (!*value || isspace(*value)) {
134 if (lenp)
135 *lenp = 0;
136 return value;
138 /* feature with a value (e.g., "agent=git/1.2.3") */
139 else if (*value == '=') {
140 value++;
141 if (lenp)
142 *lenp = strcspn(value, " \t\n");
143 return value;
146 * otherwise we matched a substring of another feature;
147 * keep looking
150 feature_list = found + 1;
152 return NULL;
155 int parse_feature_request(const char *feature_list, const char *feature)
157 return !!parse_feature_value(feature_list, feature, NULL);
160 const char *server_feature_value(const char *feature, int *len)
162 return parse_feature_value(server_capabilities, feature, len);
165 int server_supports(const char *feature)
167 return !!server_feature_value(feature, NULL);
170 enum protocol {
171 PROTO_LOCAL = 1,
172 PROTO_SSH,
173 PROTO_GIT
176 static enum protocol get_protocol(const char *name)
178 if (!strcmp(name, "ssh"))
179 return PROTO_SSH;
180 if (!strcmp(name, "git"))
181 return PROTO_GIT;
182 if (!strcmp(name, "git+ssh"))
183 return PROTO_SSH;
184 if (!strcmp(name, "ssh+git"))
185 return PROTO_SSH;
186 if (!strcmp(name, "file"))
187 return PROTO_LOCAL;
188 die("I don't handle protocol '%s'", name);
191 #define STR_(s) # s
192 #define STR(s) STR_(s)
194 static void get_host_and_port(char **host, const char **port)
196 char *colon, *end;
198 if (*host[0] == '[') {
199 end = strchr(*host + 1, ']');
200 if (end) {
201 *end = 0;
202 end++;
203 (*host)++;
204 } else
205 end = *host;
206 } else
207 end = *host;
208 colon = strchr(end, ':');
210 if (colon) {
211 *colon = 0;
212 *port = colon + 1;
216 static void enable_keepalive(int sockfd)
218 int ka = 1;
220 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
221 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
222 strerror(errno));
225 #ifndef NO_IPV6
227 static const char *ai_name(const struct addrinfo *ai)
229 static char addr[NI_MAXHOST];
230 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
231 NI_NUMERICHOST) != 0)
232 strcpy(addr, "(unknown)");
234 return addr;
238 * Returns a connected socket() fd, or else die()s.
240 static int git_tcp_connect_sock(char *host, int flags)
242 struct strbuf error_message = STRBUF_INIT;
243 int sockfd = -1;
244 const char *port = STR(DEFAULT_GIT_PORT);
245 struct addrinfo hints, *ai0, *ai;
246 int gai;
247 int cnt = 0;
249 get_host_and_port(&host, &port);
250 if (!*port)
251 port = "<none>";
253 memset(&hints, 0, sizeof(hints));
254 hints.ai_socktype = SOCK_STREAM;
255 hints.ai_protocol = IPPROTO_TCP;
257 if (flags & CONNECT_VERBOSE)
258 fprintf(stderr, "Looking up %s ... ", host);
260 gai = getaddrinfo(host, port, &hints, &ai);
261 if (gai)
262 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
264 if (flags & CONNECT_VERBOSE)
265 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
267 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
268 sockfd = socket(ai->ai_family,
269 ai->ai_socktype, ai->ai_protocol);
270 if ((sockfd < 0) ||
271 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
272 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
273 host, cnt, ai_name(ai), strerror(errno));
274 if (0 <= sockfd)
275 close(sockfd);
276 sockfd = -1;
277 continue;
279 if (flags & CONNECT_VERBOSE)
280 fprintf(stderr, "%s ", ai_name(ai));
281 break;
284 freeaddrinfo(ai0);
286 if (sockfd < 0)
287 die("unable to connect to %s:\n%s", host, error_message.buf);
289 enable_keepalive(sockfd);
291 if (flags & CONNECT_VERBOSE)
292 fprintf(stderr, "done.\n");
294 strbuf_release(&error_message);
296 return sockfd;
299 #else /* NO_IPV6 */
302 * Returns a connected socket() fd, or else die()s.
304 static int git_tcp_connect_sock(char *host, int flags)
306 struct strbuf error_message = STRBUF_INIT;
307 int sockfd = -1;
308 const char *port = STR(DEFAULT_GIT_PORT);
309 char *ep;
310 struct hostent *he;
311 struct sockaddr_in sa;
312 char **ap;
313 unsigned int nport;
314 int cnt;
316 get_host_and_port(&host, &port);
318 if (flags & CONNECT_VERBOSE)
319 fprintf(stderr, "Looking up %s ... ", host);
321 he = gethostbyname(host);
322 if (!he)
323 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
324 nport = strtoul(port, &ep, 10);
325 if ( ep == port || *ep ) {
326 /* Not numeric */
327 struct servent *se = getservbyname(port,"tcp");
328 if ( !se )
329 die("Unknown port %s", port);
330 nport = se->s_port;
333 if (flags & CONNECT_VERBOSE)
334 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
336 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
337 memset(&sa, 0, sizeof sa);
338 sa.sin_family = he->h_addrtype;
339 sa.sin_port = htons(nport);
340 memcpy(&sa.sin_addr, *ap, he->h_length);
342 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
343 if ((sockfd < 0) ||
344 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
345 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
346 host,
347 cnt,
348 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
349 strerror(errno));
350 if (0 <= sockfd)
351 close(sockfd);
352 sockfd = -1;
353 continue;
355 if (flags & CONNECT_VERBOSE)
356 fprintf(stderr, "%s ",
357 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
358 break;
361 if (sockfd < 0)
362 die("unable to connect to %s:\n%s", host, error_message.buf);
364 enable_keepalive(sockfd);
366 if (flags & CONNECT_VERBOSE)
367 fprintf(stderr, "done.\n");
369 return sockfd;
372 #endif /* NO_IPV6 */
375 static void git_tcp_connect(int fd[2], char *host, int flags)
377 int sockfd = git_tcp_connect_sock(host, flags);
379 fd[0] = sockfd;
380 fd[1] = dup(sockfd);
384 static char *git_proxy_command;
386 static int git_proxy_command_options(const char *var, const char *value,
387 void *cb)
389 if (!strcmp(var, "core.gitproxy")) {
390 const char *for_pos;
391 int matchlen = -1;
392 int hostlen;
393 const char *rhost_name = cb;
394 int rhost_len = strlen(rhost_name);
396 if (git_proxy_command)
397 return 0;
398 if (!value)
399 return config_error_nonbool(var);
400 /* [core]
401 * ;# matches www.kernel.org as well
402 * gitproxy = netcatter-1 for kernel.org
403 * gitproxy = netcatter-2 for sample.xz
404 * gitproxy = netcatter-default
406 for_pos = strstr(value, " for ");
407 if (!for_pos)
408 /* matches everybody */
409 matchlen = strlen(value);
410 else {
411 hostlen = strlen(for_pos + 5);
412 if (rhost_len < hostlen)
413 matchlen = -1;
414 else if (!strncmp(for_pos + 5,
415 rhost_name + rhost_len - hostlen,
416 hostlen) &&
417 ((rhost_len == hostlen) ||
418 rhost_name[rhost_len - hostlen -1] == '.'))
419 matchlen = for_pos - value;
420 else
421 matchlen = -1;
423 if (0 <= matchlen) {
424 /* core.gitproxy = none for kernel.org */
425 if (matchlen == 4 &&
426 !memcmp(value, "none", 4))
427 matchlen = 0;
428 git_proxy_command = xmemdupz(value, matchlen);
430 return 0;
433 return git_default_config(var, value, cb);
436 static int git_use_proxy(const char *host)
438 git_proxy_command = getenv("GIT_PROXY_COMMAND");
439 git_config(git_proxy_command_options, (void*)host);
440 return (git_proxy_command && *git_proxy_command);
443 static struct child_process *git_proxy_connect(int fd[2], char *host)
445 const char *port = STR(DEFAULT_GIT_PORT);
446 const char **argv;
447 struct child_process *proxy;
449 get_host_and_port(&host, &port);
451 argv = xmalloc(sizeof(*argv) * 4);
452 argv[0] = git_proxy_command;
453 argv[1] = host;
454 argv[2] = port;
455 argv[3] = NULL;
456 proxy = xcalloc(1, sizeof(*proxy));
457 proxy->argv = argv;
458 proxy->in = -1;
459 proxy->out = -1;
460 if (start_command(proxy))
461 die("cannot start proxy %s", argv[0]);
462 fd[0] = proxy->out; /* read from proxy stdout */
463 fd[1] = proxy->in; /* write to proxy stdin */
464 return proxy;
467 #define MAX_CMD_LEN 1024
469 static char *get_port(char *host)
471 char *end;
472 char *p = strchr(host, ':');
474 if (p) {
475 long port = strtol(p + 1, &end, 10);
476 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
477 *p = '\0';
478 return p+1;
482 return NULL;
485 static struct child_process no_fork;
488 * This returns a dummy child_process if the transport protocol does not
489 * need fork(2), or a struct child_process object if it does. Once done,
490 * finish the connection with finish_connect() with the value returned from
491 * this function (it is safe to call finish_connect() with NULL to support
492 * the former case).
494 * If it returns, the connect is successful; it just dies on errors (this
495 * will hopefully be changed in a libification effort, to return NULL when
496 * the connection failed).
498 struct child_process *git_connect(int fd[2], const char *url_orig,
499 const char *prog, int flags)
501 char *url;
502 char *host, *path;
503 char *end;
504 int c;
505 struct child_process *conn = &no_fork;
506 enum protocol protocol = PROTO_LOCAL;
507 int free_path = 0;
508 char *port = NULL;
509 const char **arg;
510 struct strbuf cmd;
512 /* Without this we cannot rely on waitpid() to tell
513 * what happened to our children.
515 signal(SIGCHLD, SIG_DFL);
517 if (is_url(url_orig))
518 url = url_decode(url_orig);
519 else
520 url = xstrdup(url_orig);
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 = ':';
534 * Don't do destructive transforms with git:// as that
535 * protocol code does '[]' unwrapping of its own.
537 if (host[0] == '[') {
538 end = strchr(host + 1, ']');
539 if (end) {
540 if (protocol != PROTO_GIT) {
541 *end = 0;
542 host++;
544 end++;
545 } else
546 end = host;
547 } else
548 end = host;
550 path = strchr(end, c);
551 if (path && !has_dos_drive_prefix(end)) {
552 if (c == ':') {
553 protocol = PROTO_SSH;
554 *path++ = '\0';
556 } else
557 path = end;
559 if (!path || !*path)
560 die("No path specified. See 'man git-pull' for valid url syntax");
563 * null-terminate hostname and point path to ~ for URL's like this:
564 * ssh://host.xz/~user/repo
566 if (protocol != PROTO_LOCAL && host != url) {
567 char *ptr = path;
568 if (path[1] == '~')
569 path++;
570 else {
571 path = xstrdup(ptr);
572 free_path = 1;
575 *ptr = '\0';
579 * Add support for ssh port: ssh://host.xy:<port>/...
581 if (protocol == PROTO_SSH && host != url)
582 port = get_port(end);
584 if (protocol == PROTO_GIT) {
585 /* These underlying connection commands die() if they
586 * cannot connect.
588 char *target_host = xstrdup(host);
589 if (git_use_proxy(host))
590 conn = git_proxy_connect(fd, host);
591 else
592 git_tcp_connect(fd, host, flags);
594 * Separate original protocol components prog and path
595 * from extended host header with a NUL byte.
597 * Note: Do not add any other headers here! Doing so
598 * will cause older git-daemon servers to crash.
600 packet_write(fd[1],
601 "%s %s%chost=%s%c",
602 prog, path, 0,
603 target_host, 0);
604 free(target_host);
605 free(url);
606 if (free_path)
607 free(path);
608 return conn;
611 conn = xcalloc(1, sizeof(*conn));
613 strbuf_init(&cmd, MAX_CMD_LEN);
614 strbuf_addstr(&cmd, prog);
615 strbuf_addch(&cmd, ' ');
616 sq_quote_buf(&cmd, path);
617 if (cmd.len >= MAX_CMD_LEN)
618 die("command line too long");
620 conn->in = conn->out = -1;
621 conn->argv = arg = xcalloc(7, sizeof(*arg));
622 if (protocol == PROTO_SSH) {
623 const char *ssh = getenv("GIT_SSH");
624 int putty = ssh && strcasestr(ssh, "plink");
625 if (!ssh) ssh = "ssh";
627 *arg++ = ssh;
628 if (putty && !strcasestr(ssh, "tortoiseplink"))
629 *arg++ = "-batch";
630 if (port) {
631 /* P is for PuTTY, p is for OpenSSH */
632 *arg++ = putty ? "-P" : "-p";
633 *arg++ = port;
635 *arg++ = host;
637 else {
638 /* remove repo-local variables from the environment */
639 conn->env = local_repo_env;
640 conn->use_shell = 1;
642 *arg++ = cmd.buf;
643 *arg = NULL;
645 if (start_command(conn))
646 die("unable to fork");
648 fd[0] = conn->out; /* read from child's stdout */
649 fd[1] = conn->in; /* write to child's stdin */
650 strbuf_release(&cmd);
651 free(url);
652 if (free_path)
653 free(path);
654 return conn;
657 int git_connection_is_socket(struct child_process *conn)
659 return conn == &no_fork;
662 int finish_connect(struct child_process *conn)
664 int code;
665 if (!conn || git_connection_is_socket(conn))
666 return 0;
668 code = finish_command(conn);
669 free(conn->argv);
670 free(conn);
671 return code;