Merge branch 'ds/rev-parse-required-args'
[git/debian.git] / connect.c
blob4150412e2c0ebf6129137baf41c9d268d50c60bd
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 "connect.h"
9 #include "url.h"
10 #include "string-list.h"
11 #include "sha1-array.h"
13 static char *server_capabilities;
14 static const char *parse_feature_value(const char *, const char *, int *);
16 static int check_ref(const char *name, int len, unsigned int flags)
18 if (!flags)
19 return 1;
21 if (len < 5 || memcmp(name, "refs/", 5))
22 return 0;
24 /* Skip the "refs/" part */
25 name += 5;
26 len -= 5;
28 /* REF_NORMAL means that we don't want the magic fake tag refs */
29 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
30 return 0;
32 /* REF_HEADS means that we want regular branch heads */
33 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
34 return 1;
36 /* REF_TAGS means that we want tags */
37 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
38 return 1;
40 /* All type bits clear means that we are ok with anything */
41 return !(flags & ~REF_NORMAL);
44 int check_ref_type(const struct ref *ref, int flags)
46 return check_ref(ref->name, strlen(ref->name), flags);
49 static void die_initial_contact(int got_at_least_one_head)
51 if (got_at_least_one_head)
52 die("The remote end hung up upon initial contact");
53 else
54 die("Could not read from remote repository.\n\n"
55 "Please make sure you have the correct access rights\n"
56 "and the repository exists.");
59 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
61 char *sym, *target;
62 struct string_list_item *item;
64 if (!len)
65 return; /* just "symref" */
66 /* e.g. "symref=HEAD:refs/heads/master" */
67 sym = xmalloc(len + 1);
68 memcpy(sym, val, len);
69 sym[len] = '\0';
70 target = strchr(sym, ':');
71 if (!target)
72 /* just "symref=something" */
73 goto reject;
74 *(target++) = '\0';
75 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
76 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
77 /* "symref=bogus:pair */
78 goto reject;
79 item = string_list_append(symref, sym);
80 item->util = target;
81 return;
82 reject:
83 free(sym);
84 return;
87 static void annotate_refs_with_symref_info(struct ref *ref)
89 struct string_list symref = STRING_LIST_INIT_DUP;
90 const char *feature_list = server_capabilities;
92 while (feature_list) {
93 int len;
94 const char *val;
96 val = parse_feature_value(feature_list, "symref", &len);
97 if (!val)
98 break;
99 parse_one_symref_info(&symref, val, len);
100 feature_list = val + 1;
102 sort_string_list(&symref);
104 for (; ref; ref = ref->next) {
105 struct string_list_item *item;
106 item = string_list_lookup(&symref, ref->name);
107 if (!item)
108 continue;
109 ref->symref = xstrdup((char *)item->util);
111 string_list_clear(&symref, 0);
115 * Read all the refs from the other end
117 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
118 struct ref **list, unsigned int flags,
119 struct sha1_array *extra_have,
120 struct sha1_array *shallow_points)
122 struct ref **orig_list = list;
123 int got_at_least_one_head = 0;
125 *list = NULL;
126 for (;;) {
127 struct ref *ref;
128 unsigned char old_sha1[20];
129 char *name;
130 int len, name_len;
131 char *buffer = packet_buffer;
133 len = packet_read(in, &src_buf, &src_len,
134 packet_buffer, sizeof(packet_buffer),
135 PACKET_READ_GENTLE_ON_EOF |
136 PACKET_READ_CHOMP_NEWLINE);
137 if (len < 0)
138 die_initial_contact(got_at_least_one_head);
140 if (!len)
141 break;
143 if (len > 4 && starts_with(buffer, "ERR "))
144 die("remote error: %s", buffer + 4);
146 if (len == 48 && starts_with(buffer, "shallow ")) {
147 if (get_sha1_hex(buffer + 8, old_sha1))
148 die("protocol error: expected shallow sha-1, got '%s'", buffer + 8);
149 if (!shallow_points)
150 die("repository on the other end cannot be shallow");
151 sha1_array_append(shallow_points, old_sha1);
152 continue;
155 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
156 die("protocol error: expected sha/ref, got '%s'", buffer);
157 name = buffer + 41;
159 name_len = strlen(name);
160 if (len != name_len + 41) {
161 free(server_capabilities);
162 server_capabilities = xstrdup(name + name_len + 1);
165 if (extra_have &&
166 name_len == 5 && !memcmp(".have", name, 5)) {
167 sha1_array_append(extra_have, old_sha1);
168 continue;
171 if (!check_ref(name, name_len, flags))
172 continue;
173 ref = alloc_ref(buffer + 41);
174 hashcpy(ref->old_sha1, old_sha1);
175 *list = ref;
176 list = &ref->next;
177 got_at_least_one_head = 1;
180 annotate_refs_with_symref_info(*orig_list);
182 return list;
185 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
187 int len;
189 if (!feature_list)
190 return NULL;
192 len = strlen(feature);
193 while (*feature_list) {
194 const char *found = strstr(feature_list, feature);
195 if (!found)
196 return NULL;
197 if (feature_list == found || isspace(found[-1])) {
198 const char *value = found + len;
199 /* feature with no value (e.g., "thin-pack") */
200 if (!*value || isspace(*value)) {
201 if (lenp)
202 *lenp = 0;
203 return value;
205 /* feature with a value (e.g., "agent=git/1.2.3") */
206 else if (*value == '=') {
207 value++;
208 if (lenp)
209 *lenp = strcspn(value, " \t\n");
210 return value;
213 * otherwise we matched a substring of another feature;
214 * keep looking
217 feature_list = found + 1;
219 return NULL;
222 int parse_feature_request(const char *feature_list, const char *feature)
224 return !!parse_feature_value(feature_list, feature, NULL);
227 const char *server_feature_value(const char *feature, int *len)
229 return parse_feature_value(server_capabilities, feature, len);
232 int server_supports(const char *feature)
234 return !!server_feature_value(feature, NULL);
237 enum protocol {
238 PROTO_LOCAL = 1,
239 PROTO_FILE,
240 PROTO_SSH,
241 PROTO_GIT
244 int url_is_local_not_ssh(const char *url)
246 const char *colon = strchr(url, ':');
247 const char *slash = strchr(url, '/');
248 return !colon || (slash && slash < colon) ||
249 has_dos_drive_prefix(url);
252 static const char *prot_name(enum protocol protocol)
254 switch (protocol) {
255 case PROTO_LOCAL:
256 case PROTO_FILE:
257 return "file";
258 case PROTO_SSH:
259 return "ssh";
260 case PROTO_GIT:
261 return "git";
262 default:
263 return "unkown protocol";
267 static enum protocol get_protocol(const char *name)
269 if (!strcmp(name, "ssh"))
270 return PROTO_SSH;
271 if (!strcmp(name, "git"))
272 return PROTO_GIT;
273 if (!strcmp(name, "git+ssh"))
274 return PROTO_SSH;
275 if (!strcmp(name, "ssh+git"))
276 return PROTO_SSH;
277 if (!strcmp(name, "file"))
278 return PROTO_FILE;
279 die("I don't handle protocol '%s'", name);
282 #define STR_(s) # s
283 #define STR(s) STR_(s)
285 static void get_host_and_port(char **host, const char **port)
287 char *colon, *end;
289 if (*host[0] == '[') {
290 end = strchr(*host + 1, ']');
291 if (end) {
292 *end = 0;
293 end++;
294 (*host)++;
295 } else
296 end = *host;
297 } else
298 end = *host;
299 colon = strchr(end, ':');
301 if (colon) {
302 *colon = 0;
303 *port = colon + 1;
307 static void enable_keepalive(int sockfd)
309 int ka = 1;
311 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
312 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
313 strerror(errno));
316 #ifndef NO_IPV6
318 static const char *ai_name(const struct addrinfo *ai)
320 static char addr[NI_MAXHOST];
321 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
322 NI_NUMERICHOST) != 0)
323 strcpy(addr, "(unknown)");
325 return addr;
329 * Returns a connected socket() fd, or else die()s.
331 static int git_tcp_connect_sock(char *host, int flags)
333 struct strbuf error_message = STRBUF_INIT;
334 int sockfd = -1;
335 const char *port = STR(DEFAULT_GIT_PORT);
336 struct addrinfo hints, *ai0, *ai;
337 int gai;
338 int cnt = 0;
340 get_host_and_port(&host, &port);
341 if (!*port)
342 port = "<none>";
344 memset(&hints, 0, sizeof(hints));
345 hints.ai_socktype = SOCK_STREAM;
346 hints.ai_protocol = IPPROTO_TCP;
348 if (flags & CONNECT_VERBOSE)
349 fprintf(stderr, "Looking up %s ... ", host);
351 gai = getaddrinfo(host, port, &hints, &ai);
352 if (gai)
353 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
355 if (flags & CONNECT_VERBOSE)
356 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
358 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
359 sockfd = socket(ai->ai_family,
360 ai->ai_socktype, ai->ai_protocol);
361 if ((sockfd < 0) ||
362 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
363 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
364 host, cnt, ai_name(ai), strerror(errno));
365 if (0 <= sockfd)
366 close(sockfd);
367 sockfd = -1;
368 continue;
370 if (flags & CONNECT_VERBOSE)
371 fprintf(stderr, "%s ", ai_name(ai));
372 break;
375 freeaddrinfo(ai0);
377 if (sockfd < 0)
378 die("unable to connect to %s:\n%s", host, error_message.buf);
380 enable_keepalive(sockfd);
382 if (flags & CONNECT_VERBOSE)
383 fprintf(stderr, "done.\n");
385 strbuf_release(&error_message);
387 return sockfd;
390 #else /* NO_IPV6 */
393 * Returns a connected socket() fd, or else die()s.
395 static int git_tcp_connect_sock(char *host, int flags)
397 struct strbuf error_message = STRBUF_INIT;
398 int sockfd = -1;
399 const char *port = STR(DEFAULT_GIT_PORT);
400 char *ep;
401 struct hostent *he;
402 struct sockaddr_in sa;
403 char **ap;
404 unsigned int nport;
405 int cnt;
407 get_host_and_port(&host, &port);
409 if (flags & CONNECT_VERBOSE)
410 fprintf(stderr, "Looking up %s ... ", host);
412 he = gethostbyname(host);
413 if (!he)
414 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
415 nport = strtoul(port, &ep, 10);
416 if ( ep == port || *ep ) {
417 /* Not numeric */
418 struct servent *se = getservbyname(port,"tcp");
419 if ( !se )
420 die("Unknown port %s", port);
421 nport = se->s_port;
424 if (flags & CONNECT_VERBOSE)
425 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
427 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
428 memset(&sa, 0, sizeof sa);
429 sa.sin_family = he->h_addrtype;
430 sa.sin_port = htons(nport);
431 memcpy(&sa.sin_addr, *ap, he->h_length);
433 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
434 if ((sockfd < 0) ||
435 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
436 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
437 host,
438 cnt,
439 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
440 strerror(errno));
441 if (0 <= sockfd)
442 close(sockfd);
443 sockfd = -1;
444 continue;
446 if (flags & CONNECT_VERBOSE)
447 fprintf(stderr, "%s ",
448 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
449 break;
452 if (sockfd < 0)
453 die("unable to connect to %s:\n%s", host, error_message.buf);
455 enable_keepalive(sockfd);
457 if (flags & CONNECT_VERBOSE)
458 fprintf(stderr, "done.\n");
460 return sockfd;
463 #endif /* NO_IPV6 */
466 static void git_tcp_connect(int fd[2], char *host, int flags)
468 int sockfd = git_tcp_connect_sock(host, flags);
470 fd[0] = sockfd;
471 fd[1] = dup(sockfd);
475 static char *git_proxy_command;
477 static int git_proxy_command_options(const char *var, const char *value,
478 void *cb)
480 if (!strcmp(var, "core.gitproxy")) {
481 const char *for_pos;
482 int matchlen = -1;
483 int hostlen;
484 const char *rhost_name = cb;
485 int rhost_len = strlen(rhost_name);
487 if (git_proxy_command)
488 return 0;
489 if (!value)
490 return config_error_nonbool(var);
491 /* [core]
492 * ;# matches www.kernel.org as well
493 * gitproxy = netcatter-1 for kernel.org
494 * gitproxy = netcatter-2 for sample.xz
495 * gitproxy = netcatter-default
497 for_pos = strstr(value, " for ");
498 if (!for_pos)
499 /* matches everybody */
500 matchlen = strlen(value);
501 else {
502 hostlen = strlen(for_pos + 5);
503 if (rhost_len < hostlen)
504 matchlen = -1;
505 else if (!strncmp(for_pos + 5,
506 rhost_name + rhost_len - hostlen,
507 hostlen) &&
508 ((rhost_len == hostlen) ||
509 rhost_name[rhost_len - hostlen -1] == '.'))
510 matchlen = for_pos - value;
511 else
512 matchlen = -1;
514 if (0 <= matchlen) {
515 /* core.gitproxy = none for kernel.org */
516 if (matchlen == 4 &&
517 !memcmp(value, "none", 4))
518 matchlen = 0;
519 git_proxy_command = xmemdupz(value, matchlen);
521 return 0;
524 return git_default_config(var, value, cb);
527 static int git_use_proxy(const char *host)
529 git_proxy_command = getenv("GIT_PROXY_COMMAND");
530 git_config(git_proxy_command_options, (void*)host);
531 return (git_proxy_command && *git_proxy_command);
534 static struct child_process *git_proxy_connect(int fd[2], char *host)
536 const char *port = STR(DEFAULT_GIT_PORT);
537 const char **argv;
538 struct child_process *proxy;
540 get_host_and_port(&host, &port);
542 argv = xmalloc(sizeof(*argv) * 4);
543 argv[0] = git_proxy_command;
544 argv[1] = host;
545 argv[2] = port;
546 argv[3] = NULL;
547 proxy = xcalloc(1, sizeof(*proxy));
548 proxy->argv = argv;
549 proxy->in = -1;
550 proxy->out = -1;
551 if (start_command(proxy))
552 die("cannot start proxy %s", argv[0]);
553 fd[0] = proxy->out; /* read from proxy stdout */
554 fd[1] = proxy->in; /* write to proxy stdin */
555 return proxy;
558 static const char *get_port_numeric(const char *p)
560 char *end;
561 if (p) {
562 long port = strtol(p + 1, &end, 10);
563 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
564 return p;
568 return NULL;
572 * Extract protocol and relevant parts from the specified connection URL.
573 * The caller must free() the returned strings.
575 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
576 char **ret_path)
578 char *url;
579 char *host, *path;
580 char *end;
581 int separator = '/';
582 enum protocol protocol = PROTO_LOCAL;
584 if (is_url(url_orig))
585 url = url_decode(url_orig);
586 else
587 url = xstrdup(url_orig);
589 host = strstr(url, "://");
590 if (host) {
591 *host = '\0';
592 protocol = get_protocol(url);
593 host += 3;
594 } else {
595 host = url;
596 if (!url_is_local_not_ssh(url)) {
597 protocol = PROTO_SSH;
598 separator = ':';
603 * Don't do destructive transforms as protocol code does
604 * '[]' unwrapping in get_host_and_port()
606 if (host[0] == '[') {
607 end = strchr(host + 1, ']');
608 if (end) {
609 end++;
610 } else
611 end = host;
612 } else
613 end = host;
615 if (protocol == PROTO_LOCAL)
616 path = end;
617 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
618 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
619 else
620 path = strchr(end, separator);
622 if (!path || !*path)
623 die("No path specified. See 'man git-pull' for valid url syntax");
626 * null-terminate hostname and point path to ~ for URL's like this:
627 * ssh://host.xz/~user/repo
630 end = path; /* Need to \0 terminate host here */
631 if (separator == ':')
632 path++; /* path starts after ':' */
633 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
634 if (path[1] == '~')
635 path++;
638 path = xstrdup(path);
639 *end = '\0';
641 *ret_host = xstrdup(host);
642 *ret_path = path;
643 free(url);
644 return protocol;
647 static struct child_process no_fork;
650 * This returns a dummy child_process if the transport protocol does not
651 * need fork(2), or a struct child_process object if it does. Once done,
652 * finish the connection with finish_connect() with the value returned from
653 * this function (it is safe to call finish_connect() with NULL to support
654 * the former case).
656 * If it returns, the connect is successful; it just dies on errors (this
657 * will hopefully be changed in a libification effort, to return NULL when
658 * the connection failed).
660 struct child_process *git_connect(int fd[2], const char *url,
661 const char *prog, int flags)
663 char *hostandport, *path;
664 struct child_process *conn = &no_fork;
665 enum protocol protocol;
666 const char **arg;
667 struct strbuf cmd = STRBUF_INIT;
669 /* Without this we cannot rely on waitpid() to tell
670 * what happened to our children.
672 signal(SIGCHLD, SIG_DFL);
674 protocol = parse_connect_url(url, &hostandport, &path);
675 if (flags & CONNECT_DIAG_URL) {
676 printf("Diag: url=%s\n", url ? url : "NULL");
677 printf("Diag: protocol=%s\n", prot_name(protocol));
678 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
679 printf("Diag: path=%s\n", path ? path : "NULL");
680 conn = NULL;
681 } else if (protocol == PROTO_GIT) {
682 /* These underlying connection commands die() if they
683 * cannot connect.
685 char *target_host = xstrdup(hostandport);
686 if (git_use_proxy(hostandport))
687 conn = git_proxy_connect(fd, hostandport);
688 else
689 git_tcp_connect(fd, hostandport, flags);
691 * Separate original protocol components prog and path
692 * from extended host header with a NUL byte.
694 * Note: Do not add any other headers here! Doing so
695 * will cause older git-daemon servers to crash.
697 packet_write(fd[1],
698 "%s %s%chost=%s%c",
699 prog, path, 0,
700 target_host, 0);
701 free(target_host);
702 } else {
703 conn = xcalloc(1, sizeof(*conn));
705 strbuf_addstr(&cmd, prog);
706 strbuf_addch(&cmd, ' ');
707 sq_quote_buf(&cmd, path);
709 conn->in = conn->out = -1;
710 conn->argv = arg = xcalloc(7, sizeof(*arg));
711 if (protocol == PROTO_SSH) {
712 const char *ssh = getenv("GIT_SSH");
713 int putty = ssh && strcasestr(ssh, "plink");
714 char *ssh_host = hostandport;
715 const char *port = NULL;
716 get_host_and_port(&ssh_host, &port);
717 port = get_port_numeric(port);
719 if (!ssh) ssh = "ssh";
721 *arg++ = ssh;
722 if (putty && !strcasestr(ssh, "tortoiseplink"))
723 *arg++ = "-batch";
724 if (port) {
725 /* P is for PuTTY, p is for OpenSSH */
726 *arg++ = putty ? "-P" : "-p";
727 *arg++ = port;
729 *arg++ = ssh_host;
730 } else {
731 /* remove repo-local variables from the environment */
732 conn->env = local_repo_env;
733 conn->use_shell = 1;
735 *arg++ = cmd.buf;
736 *arg = NULL;
738 if (start_command(conn))
739 die("unable to fork");
741 fd[0] = conn->out; /* read from child's stdout */
742 fd[1] = conn->in; /* write to child's stdin */
743 strbuf_release(&cmd);
745 free(hostandport);
746 free(path);
747 return conn;
750 int git_connection_is_socket(struct child_process *conn)
752 return conn == &no_fork;
755 int finish_connect(struct child_process *conn)
757 int code;
758 if (!conn || git_connection_is_socket(conn))
759 return 0;
761 code = finish_command(conn);
762 free(conn->argv);
763 free(conn);
764 return code;