1 #include "git-compat-util.h"
6 #include "run-command.h"
10 #include "string-list.h"
11 #include "sha1-array.h"
12 #include "transport.h"
14 static char *server_capabilities;
15 static const char *parse_feature_value(const char *, const char *, int *);
17 static int check_ref(const char *name, unsigned int flags)
22 if (!skip_prefix(name, "refs/", &name))
25 /* REF_NORMAL means that we don't want the magic fake tag refs */
26 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
29 /* REF_HEADS means that we want regular branch heads */
30 if ((flags & REF_HEADS) && starts_with(name, "heads/"))
33 /* REF_TAGS means that we want tags */
34 if ((flags & REF_TAGS) && starts_with(name, "tags/"))
37 /* All type bits clear means that we are ok with anything */
38 return !(flags & ~REF_NORMAL);
41 int check_ref_type(const struct ref *ref, int flags)
43 return check_ref(ref->name, flags);
46 static void die_initial_contact(int got_at_least_one_head)
48 if (got_at_least_one_head)
49 die("The remote end hung up upon initial contact");
51 die("Could not read from remote repository.\n\n"
52 "Please make sure you have the correct access rights\n"
53 "and the repository exists.");
56 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
59 struct string_list_item *item;
62 return; /* just "symref" */
63 /* e.g. "symref=HEAD:refs/heads/master" */
64 sym = xmemdupz(val, len);
65 target = strchr(sym, ':');
67 /* just "symref=something" */
70 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
71 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
72 /* "symref=bogus:pair */
74 item = string_list_append(symref, sym);
82 static void annotate_refs_with_symref_info(struct ref *ref)
84 struct string_list symref = STRING_LIST_INIT_DUP;
85 const char *feature_list = server_capabilities;
87 while (feature_list) {
91 val = parse_feature_value(feature_list, "symref", &len);
94 parse_one_symref_info(&symref, val, len);
95 feature_list = val + 1;
97 string_list_sort(&symref);
99 for (; ref; ref = ref->next) {
100 struct string_list_item *item;
101 item = string_list_lookup(&symref, ref->name);
104 ref->symref = xstrdup((char *)item->util);
106 string_list_clear(&symref, 0);
110 * Read all the refs from the other end
112 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
113 struct ref **list, unsigned int flags,
114 struct sha1_array *extra_have,
115 struct sha1_array *shallow_points)
117 struct ref **orig_list = list;
118 int got_at_least_one_head = 0;
123 struct object_id old_oid;
126 char *buffer = packet_buffer;
129 len = packet_read(in, &src_buf, &src_len,
130 packet_buffer, sizeof(packet_buffer),
131 PACKET_READ_GENTLE_ON_EOF |
132 PACKET_READ_CHOMP_NEWLINE);
134 die_initial_contact(got_at_least_one_head);
139 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
140 die("remote error: %s", arg);
142 if (len == GIT_SHA1_HEXSZ + strlen("shallow ") &&
143 skip_prefix(buffer, "shallow ", &arg)) {
144 if (get_oid_hex(arg, &old_oid))
145 die("protocol error: expected shallow sha-1, got '%s'", arg);
147 die("repository on the other end cannot be shallow");
148 sha1_array_append(shallow_points, old_oid.hash);
152 if (len < GIT_SHA1_HEXSZ + 2 || get_oid_hex(buffer, &old_oid) ||
153 buffer[GIT_SHA1_HEXSZ] != ' ')
154 die("protocol error: expected sha/ref, got '%s'", buffer);
155 name = buffer + GIT_SHA1_HEXSZ + 1;
157 name_len = strlen(name);
158 if (len != name_len + GIT_SHA1_HEXSZ + 1) {
159 free(server_capabilities);
160 server_capabilities = xstrdup(name + name_len + 1);
163 if (extra_have && !strcmp(name, ".have")) {
164 sha1_array_append(extra_have, old_oid.hash);
168 if (!check_ref(name, flags))
170 ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
171 oidcpy(&ref->old_oid, &old_oid);
174 got_at_least_one_head = 1;
177 annotate_refs_with_symref_info(*orig_list);
182 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
189 len = strlen(feature);
190 while (*feature_list) {
191 const char *found = strstr(feature_list, feature);
194 if (feature_list == found || isspace(found[-1])) {
195 const char *value = found + len;
196 /* feature with no value (e.g., "thin-pack") */
197 if (!*value || isspace(*value)) {
202 /* feature with a value (e.g., "agent=git/1.2.3") */
203 else if (*value == '=') {
206 *lenp = strcspn(value, " \t\n");
210 * otherwise we matched a substring of another feature;
214 feature_list = found + 1;
219 int parse_feature_request(const char *feature_list, const char *feature)
221 return !!parse_feature_value(feature_list, feature, NULL);
224 const char *server_feature_value(const char *feature, int *len)
226 return parse_feature_value(server_capabilities, feature, len);
229 int server_supports(const char *feature)
231 return !!server_feature_value(feature, NULL);
241 int url_is_local_not_ssh(const char *url)
243 const char *colon = strchr(url, ':');
244 const char *slash = strchr(url, '/');
245 return !colon || (slash && slash < colon) ||
246 has_dos_drive_prefix(url);
249 static const char *prot_name(enum protocol protocol)
260 return "unknown protocol";
264 static enum protocol get_protocol(const char *name)
266 if (!strcmp(name, "ssh"))
268 if (!strcmp(name, "git"))
270 if (!strcmp(name, "git+ssh"))
272 if (!strcmp(name, "ssh+git"))
274 if (!strcmp(name, "file"))
276 die("I don't handle protocol '%s'", name);
279 static char *host_end(char **hoststart, int removebrackets)
281 char *host = *hoststart;
283 char *start = strstr(host, "@[");
285 start++; /* Jump over '@' */
288 if (start[0] == '[') {
289 end = strchr(start + 1, ']');
291 if (removebrackets) {
293 memmove(start, start + 1, end - start);
304 #define STR(s) STR_(s)
306 static void get_host_and_port(char **host, const char **port)
309 end = host_end(host, 1);
310 colon = strchr(end, ':');
312 long portnr = strtol(colon + 1, &end, 10);
313 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
316 } else if (!colon[1]) {
322 static void enable_keepalive(int sockfd)
326 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
327 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
333 static const char *ai_name(const struct addrinfo *ai)
335 static char addr[NI_MAXHOST];
336 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
337 NI_NUMERICHOST) != 0)
338 xsnprintf(addr, sizeof(addr), "(unknown)");
344 * Returns a connected socket() fd, or else die()s.
346 static int git_tcp_connect_sock(char *host, int flags)
348 struct strbuf error_message = STRBUF_INIT;
350 const char *port = STR(DEFAULT_GIT_PORT);
351 struct addrinfo hints, *ai0, *ai;
355 get_host_and_port(&host, &port);
359 memset(&hints, 0, sizeof(hints));
360 hints.ai_socktype = SOCK_STREAM;
361 hints.ai_protocol = IPPROTO_TCP;
363 if (flags & CONNECT_VERBOSE)
364 fprintf(stderr, "Looking up %s ... ", host);
366 gai = getaddrinfo(host, port, &hints, &ai);
368 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
370 if (flags & CONNECT_VERBOSE)
371 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
373 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
374 sockfd = socket(ai->ai_family,
375 ai->ai_socktype, ai->ai_protocol);
377 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
378 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
379 host, cnt, ai_name(ai), strerror(errno));
385 if (flags & CONNECT_VERBOSE)
386 fprintf(stderr, "%s ", ai_name(ai));
393 die("unable to connect to %s:\n%s", host, error_message.buf);
395 enable_keepalive(sockfd);
397 if (flags & CONNECT_VERBOSE)
398 fprintf(stderr, "done.\n");
400 strbuf_release(&error_message);
408 * Returns a connected socket() fd, or else die()s.
410 static int git_tcp_connect_sock(char *host, int flags)
412 struct strbuf error_message = STRBUF_INIT;
414 const char *port = STR(DEFAULT_GIT_PORT);
417 struct sockaddr_in sa;
422 get_host_and_port(&host, &port);
424 if (flags & CONNECT_VERBOSE)
425 fprintf(stderr, "Looking up %s ... ", host);
427 he = gethostbyname(host);
429 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
430 nport = strtoul(port, &ep, 10);
431 if ( ep == port || *ep ) {
433 struct servent *se = getservbyname(port,"tcp");
435 die("Unknown port %s", port);
439 if (flags & CONNECT_VERBOSE)
440 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
442 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
443 memset(&sa, 0, sizeof sa);
444 sa.sin_family = he->h_addrtype;
445 sa.sin_port = htons(nport);
446 memcpy(&sa.sin_addr, *ap, he->h_length);
448 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
450 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
451 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
454 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
461 if (flags & CONNECT_VERBOSE)
462 fprintf(stderr, "%s ",
463 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
468 die("unable to connect to %s:\n%s", host, error_message.buf);
470 enable_keepalive(sockfd);
472 if (flags & CONNECT_VERBOSE)
473 fprintf(stderr, "done.\n");
481 static void git_tcp_connect(int fd[2], char *host, int flags)
483 int sockfd = git_tcp_connect_sock(host, flags);
490 static char *git_proxy_command;
492 static int git_proxy_command_options(const char *var, const char *value,
495 if (!strcmp(var, "core.gitproxy")) {
499 const char *rhost_name = cb;
500 int rhost_len = strlen(rhost_name);
502 if (git_proxy_command)
505 return config_error_nonbool(var);
507 * ;# matches www.kernel.org as well
508 * gitproxy = netcatter-1 for kernel.org
509 * gitproxy = netcatter-2 for sample.xz
510 * gitproxy = netcatter-default
512 for_pos = strstr(value, " for ");
514 /* matches everybody */
515 matchlen = strlen(value);
517 hostlen = strlen(for_pos + 5);
518 if (rhost_len < hostlen)
520 else if (!strncmp(for_pos + 5,
521 rhost_name + rhost_len - hostlen,
523 ((rhost_len == hostlen) ||
524 rhost_name[rhost_len - hostlen -1] == '.'))
525 matchlen = for_pos - value;
530 /* core.gitproxy = none for kernel.org */
532 !memcmp(value, "none", 4))
534 git_proxy_command = xmemdupz(value, matchlen);
539 return git_default_config(var, value, cb);
542 static int git_use_proxy(const char *host)
544 git_proxy_command = getenv("GIT_PROXY_COMMAND");
545 git_config(git_proxy_command_options, (void*)host);
546 return (git_proxy_command && *git_proxy_command);
549 static struct child_process *git_proxy_connect(int fd[2], char *host)
551 const char *port = STR(DEFAULT_GIT_PORT);
552 struct child_process *proxy;
554 get_host_and_port(&host, &port);
556 proxy = xmalloc(sizeof(*proxy));
557 child_process_init(proxy);
558 argv_array_push(&proxy->args, git_proxy_command);
559 argv_array_push(&proxy->args, host);
560 argv_array_push(&proxy->args, port);
563 if (start_command(proxy))
564 die("cannot start proxy %s", git_proxy_command);
565 fd[0] = proxy->out; /* read from proxy stdout */
566 fd[1] = proxy->in; /* write to proxy stdin */
570 static char *get_port(char *host)
573 char *p = strchr(host, ':');
576 long port = strtol(p + 1, &end, 10);
577 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
587 * Extract protocol and relevant parts from the specified connection URL.
588 * The caller must free() the returned strings.
590 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
597 enum protocol protocol = PROTO_LOCAL;
599 if (is_url(url_orig))
600 url = url_decode(url_orig);
602 url = xstrdup(url_orig);
604 host = strstr(url, "://");
607 protocol = get_protocol(url);
611 if (!url_is_local_not_ssh(url)) {
612 protocol = PROTO_SSH;
618 * Don't do destructive transforms as protocol code does
619 * '[]' unwrapping in get_host_and_port()
621 end = host_end(&host, 0);
623 if (protocol == PROTO_LOCAL)
625 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
626 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
628 path = strchr(end, separator);
631 die("No path specified. See 'man git-pull' for valid url syntax");
634 * null-terminate hostname and point path to ~ for URL's like this:
635 * ssh://host.xz/~user/repo
638 end = path; /* Need to \0 terminate host here */
639 if (separator == ':')
640 path++; /* path starts after ':' */
641 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
646 path = xstrdup(path);
649 *ret_host = xstrdup(host);
655 static struct child_process no_fork = CHILD_PROCESS_INIT;
658 * This returns a dummy child_process if the transport protocol does not
659 * need fork(2), or a struct child_process object if it does. Once done,
660 * finish the connection with finish_connect() with the value returned from
661 * this function (it is safe to call finish_connect() with NULL to support
664 * If it returns, the connect is successful; it just dies on errors (this
665 * will hopefully be changed in a libification effort, to return NULL when
666 * the connection failed).
668 struct child_process *git_connect(int fd[2], const char *url,
669 const char *prog, int flags)
671 char *hostandport, *path;
672 struct child_process *conn = &no_fork;
673 enum protocol protocol;
674 struct strbuf cmd = STRBUF_INIT;
676 /* Without this we cannot rely on waitpid() to tell
677 * what happened to our children.
679 signal(SIGCHLD, SIG_DFL);
681 protocol = parse_connect_url(url, &hostandport, &path);
682 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
683 printf("Diag: url=%s\n", url ? url : "NULL");
684 printf("Diag: protocol=%s\n", prot_name(protocol));
685 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
686 printf("Diag: path=%s\n", path ? path : "NULL");
688 } else if (protocol == PROTO_GIT) {
690 * Set up virtual host information based on where we will
691 * connect, unless the user has overridden us in
694 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
696 target_host = xstrdup(target_host);
698 target_host = xstrdup(hostandport);
700 transport_check_allowed("git");
702 /* These underlying connection commands die() if they
705 if (git_use_proxy(hostandport))
706 conn = git_proxy_connect(fd, hostandport);
708 git_tcp_connect(fd, hostandport, flags);
710 * Separate original protocol components prog and path
711 * from extended host header with a NUL byte.
713 * Note: Do not add any other headers here! Doing so
714 * will cause older git-daemon servers to crash.
722 conn = xmalloc(sizeof(*conn));
723 child_process_init(conn);
725 strbuf_addstr(&cmd, prog);
726 strbuf_addch(&cmd, ' ');
727 sq_quote_buf(&cmd, path);
729 /* remove repo-local variables from the environment */
730 conn->env = local_repo_env;
732 conn->in = conn->out = -1;
733 if (protocol == PROTO_SSH) {
735 int putty = 0, tortoiseplink = 0;
736 char *ssh_host = hostandport;
737 const char *port = NULL;
738 transport_check_allowed("ssh");
739 get_host_and_port(&ssh_host, &port);
742 port = get_port(ssh_host);
744 if (flags & CONNECT_DIAG_URL) {
745 printf("Diag: url=%s\n", url ? url : "NULL");
746 printf("Diag: protocol=%s\n", prot_name(protocol));
747 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
748 printf("Diag: port=%s\n", port ? port : "NONE");
749 printf("Diag: path=%s\n", path ? path : "NULL");
757 if (ssh_host[0] == '-')
758 die("strange hostname '%s' blocked", ssh_host);
760 ssh = getenv("GIT_SSH_COMMAND");
766 * GIT_SSH is the no-shell version of
767 * GIT_SSH_COMMAND (and must remain so for
768 * historical compatibility).
772 ssh = getenv("GIT_SSH");
776 ssh_dup = xstrdup(ssh);
777 base = basename(ssh_dup);
779 tortoiseplink = !strcasecmp(base, "tortoiseplink") ||
780 !strcasecmp(base, "tortoiseplink.exe");
781 putty = tortoiseplink ||
782 !strcasecmp(base, "plink") ||
783 !strcasecmp(base, "plink.exe");
788 argv_array_push(&conn->args, ssh);
790 argv_array_push(&conn->args, "-batch");
792 /* P is for PuTTY, p is for OpenSSH */
793 argv_array_push(&conn->args, putty ? "-P" : "-p");
794 argv_array_push(&conn->args, port);
796 argv_array_push(&conn->args, ssh_host);
798 transport_check_allowed("file");
800 argv_array_push(&conn->args, cmd.buf);
802 if (start_command(conn))
803 die("unable to fork");
805 fd[0] = conn->out; /* read from child's stdout */
806 fd[1] = conn->in; /* write to child's stdin */
807 strbuf_release(&cmd);
814 int git_connection_is_socket(struct child_process *conn)
816 return conn == &no_fork;
819 int finish_connect(struct child_process *conn)
822 if (!conn || git_connection_is_socket(conn))
825 code = finish_command(conn);