Merge branch 'jt/http-redact-cookies' into maint
[git.git] / connect.c
blobc3a014c5babf72ee4c0d135fec264afb37b040de
1 #include "git-compat-util.h"
2 #include "cache.h"
3 #include "config.h"
4 #include "pkt-line.h"
5 #include "quote.h"
6 #include "refs.h"
7 #include "run-command.h"
8 #include "remote.h"
9 #include "connect.h"
10 #include "url.h"
11 #include "string-list.h"
12 #include "sha1-array.h"
13 #include "transport.h"
14 #include "strbuf.h"
15 #include "protocol.h"
17 static char *server_capabilities;
18 static const char *parse_feature_value(const char *, const char *, int *);
20 static int check_ref(const char *name, unsigned int flags)
22 if (!flags)
23 return 1;
25 if (!skip_prefix(name, "refs/", &name))
26 return 0;
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) && starts_with(name, "heads/"))
34 return 1;
36 /* REF_TAGS means that we want tags */
37 if ((flags & REF_TAGS) && starts_with(name, "tags/"))
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, flags);
49 static void die_initial_contact(int unexpected)
51 if (unexpected)
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 = xmemdupz(val, len);
68 target = strchr(sym, ':');
69 if (!target)
70 /* just "symref=something" */
71 goto reject;
72 *(target++) = '\0';
73 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
74 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
75 /* "symref=bogus:pair */
76 goto reject;
77 item = string_list_append_nodup(symref, sym);
78 item->util = target;
79 return;
80 reject:
81 free(sym);
82 return;
85 static void annotate_refs_with_symref_info(struct ref *ref)
87 struct string_list symref = STRING_LIST_INIT_DUP;
88 const char *feature_list = server_capabilities;
90 while (feature_list) {
91 int len;
92 const char *val;
94 val = parse_feature_value(feature_list, "symref", &len);
95 if (!val)
96 break;
97 parse_one_symref_info(&symref, val, len);
98 feature_list = val + 1;
100 string_list_sort(&symref);
102 for (; ref; ref = ref->next) {
103 struct string_list_item *item;
104 item = string_list_lookup(&symref, ref->name);
105 if (!item)
106 continue;
107 ref->symref = xstrdup((char *)item->util);
109 string_list_clear(&symref, 0);
113 * Read one line of a server's ref advertisement into packet_buffer.
115 static int read_remote_ref(int in, char **src_buf, size_t *src_len,
116 int *responded)
118 int len = packet_read(in, src_buf, src_len,
119 packet_buffer, sizeof(packet_buffer),
120 PACKET_READ_GENTLE_ON_EOF |
121 PACKET_READ_CHOMP_NEWLINE);
122 const char *arg;
123 if (len < 0)
124 die_initial_contact(*responded);
125 if (len > 4 && skip_prefix(packet_buffer, "ERR ", &arg))
126 die("remote error: %s", arg);
128 *responded = 1;
130 return len;
133 #define EXPECTING_PROTOCOL_VERSION 0
134 #define EXPECTING_FIRST_REF 1
135 #define EXPECTING_REF 2
136 #define EXPECTING_SHALLOW 3
138 /* Returns 1 if packet_buffer is a protocol version pkt-line, 0 otherwise. */
139 static int process_protocol_version(void)
141 switch (determine_protocol_version_client(packet_buffer)) {
142 case protocol_v1:
143 return 1;
144 case protocol_v0:
145 return 0;
146 default:
147 die("server is speaking an unknown protocol");
151 static void process_capabilities(int *len)
153 int nul_location = strlen(packet_buffer);
154 if (nul_location == *len)
155 return;
156 server_capabilities = xstrdup(packet_buffer + nul_location + 1);
157 *len = nul_location;
160 static int process_dummy_ref(void)
162 struct object_id oid;
163 const char *name;
165 if (parse_oid_hex(packet_buffer, &oid, &name))
166 return 0;
167 if (*name != ' ')
168 return 0;
169 name++;
171 return !oidcmp(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
174 static void check_no_capabilities(int len)
176 if (strlen(packet_buffer) != len)
177 warning("Ignoring capabilities after first line '%s'",
178 packet_buffer + strlen(packet_buffer));
181 static int process_ref(int len, struct ref ***list, unsigned int flags,
182 struct oid_array *extra_have)
184 struct object_id old_oid;
185 const char *name;
187 if (parse_oid_hex(packet_buffer, &old_oid, &name))
188 return 0;
189 if (*name != ' ')
190 return 0;
191 name++;
193 if (extra_have && !strcmp(name, ".have")) {
194 oid_array_append(extra_have, &old_oid);
195 } else if (!strcmp(name, "capabilities^{}")) {
196 die("protocol error: unexpected capabilities^{}");
197 } else if (check_ref(name, flags)) {
198 struct ref *ref = alloc_ref(name);
199 oidcpy(&ref->old_oid, &old_oid);
200 **list = ref;
201 *list = &ref->next;
203 check_no_capabilities(len);
204 return 1;
207 static int process_shallow(int len, struct oid_array *shallow_points)
209 const char *arg;
210 struct object_id old_oid;
212 if (!skip_prefix(packet_buffer, "shallow ", &arg))
213 return 0;
215 if (get_oid_hex(arg, &old_oid))
216 die("protocol error: expected shallow sha-1, got '%s'", arg);
217 if (!shallow_points)
218 die("repository on the other end cannot be shallow");
219 oid_array_append(shallow_points, &old_oid);
220 check_no_capabilities(len);
221 return 1;
225 * Read all the refs from the other end
227 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
228 struct ref **list, unsigned int flags,
229 struct oid_array *extra_have,
230 struct oid_array *shallow_points)
232 struct ref **orig_list = list;
235 * A hang-up after seeing some response from the other end
236 * means that it is unexpected, as we know the other end is
237 * willing to talk to us. A hang-up before seeing any
238 * response does not necessarily mean an ACL problem, though.
240 int responded = 0;
241 int len;
242 int state = EXPECTING_PROTOCOL_VERSION;
244 *list = NULL;
246 while ((len = read_remote_ref(in, &src_buf, &src_len, &responded))) {
247 switch (state) {
248 case EXPECTING_PROTOCOL_VERSION:
249 if (process_protocol_version()) {
250 state = EXPECTING_FIRST_REF;
251 break;
253 state = EXPECTING_FIRST_REF;
254 /* fallthrough */
255 case EXPECTING_FIRST_REF:
256 process_capabilities(&len);
257 if (process_dummy_ref()) {
258 state = EXPECTING_SHALLOW;
259 break;
261 state = EXPECTING_REF;
262 /* fallthrough */
263 case EXPECTING_REF:
264 if (process_ref(len, &list, flags, extra_have))
265 break;
266 state = EXPECTING_SHALLOW;
267 /* fallthrough */
268 case EXPECTING_SHALLOW:
269 if (process_shallow(len, shallow_points))
270 break;
271 die("protocol error: unexpected '%s'", packet_buffer);
272 default:
273 die("unexpected state %d", state);
277 annotate_refs_with_symref_info(*orig_list);
279 return list;
282 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
284 int len;
286 if (!feature_list)
287 return NULL;
289 len = strlen(feature);
290 while (*feature_list) {
291 const char *found = strstr(feature_list, feature);
292 if (!found)
293 return NULL;
294 if (feature_list == found || isspace(found[-1])) {
295 const char *value = found + len;
296 /* feature with no value (e.g., "thin-pack") */
297 if (!*value || isspace(*value)) {
298 if (lenp)
299 *lenp = 0;
300 return value;
302 /* feature with a value (e.g., "agent=git/1.2.3") */
303 else if (*value == '=') {
304 value++;
305 if (lenp)
306 *lenp = strcspn(value, " \t\n");
307 return value;
310 * otherwise we matched a substring of another feature;
311 * keep looking
314 feature_list = found + 1;
316 return NULL;
319 int parse_feature_request(const char *feature_list, const char *feature)
321 return !!parse_feature_value(feature_list, feature, NULL);
324 const char *server_feature_value(const char *feature, int *len)
326 return parse_feature_value(server_capabilities, feature, len);
329 int server_supports(const char *feature)
331 return !!server_feature_value(feature, NULL);
334 enum protocol {
335 PROTO_LOCAL = 1,
336 PROTO_FILE,
337 PROTO_SSH,
338 PROTO_GIT
341 int url_is_local_not_ssh(const char *url)
343 const char *colon = strchr(url, ':');
344 const char *slash = strchr(url, '/');
345 return !colon || (slash && slash < colon) ||
346 has_dos_drive_prefix(url);
349 static const char *prot_name(enum protocol protocol)
351 switch (protocol) {
352 case PROTO_LOCAL:
353 case PROTO_FILE:
354 return "file";
355 case PROTO_SSH:
356 return "ssh";
357 case PROTO_GIT:
358 return "git";
359 default:
360 return "unknown protocol";
364 static enum protocol get_protocol(const char *name)
366 if (!strcmp(name, "ssh"))
367 return PROTO_SSH;
368 if (!strcmp(name, "git"))
369 return PROTO_GIT;
370 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
371 return PROTO_SSH;
372 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
373 return PROTO_SSH;
374 if (!strcmp(name, "file"))
375 return PROTO_FILE;
376 die("I don't handle protocol '%s'", name);
379 static char *host_end(char **hoststart, int removebrackets)
381 char *host = *hoststart;
382 char *end;
383 char *start = strstr(host, "@[");
384 if (start)
385 start++; /* Jump over '@' */
386 else
387 start = host;
388 if (start[0] == '[') {
389 end = strchr(start + 1, ']');
390 if (end) {
391 if (removebrackets) {
392 *end = 0;
393 memmove(start, start + 1, end - start);
394 end++;
396 } else
397 end = host;
398 } else
399 end = host;
400 return end;
403 #define STR_(s) # s
404 #define STR(s) STR_(s)
406 static void get_host_and_port(char **host, const char **port)
408 char *colon, *end;
409 end = host_end(host, 1);
410 colon = strchr(end, ':');
411 if (colon) {
412 long portnr = strtol(colon + 1, &end, 10);
413 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
414 *colon = 0;
415 *port = colon + 1;
416 } else if (!colon[1]) {
417 *colon = 0;
422 static void enable_keepalive(int sockfd)
424 int ka = 1;
426 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
427 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
428 strerror(errno));
431 #ifndef NO_IPV6
433 static const char *ai_name(const struct addrinfo *ai)
435 static char addr[NI_MAXHOST];
436 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
437 NI_NUMERICHOST) != 0)
438 xsnprintf(addr, sizeof(addr), "(unknown)");
440 return addr;
444 * Returns a connected socket() fd, or else die()s.
446 static int git_tcp_connect_sock(char *host, int flags)
448 struct strbuf error_message = STRBUF_INIT;
449 int sockfd = -1;
450 const char *port = STR(DEFAULT_GIT_PORT);
451 struct addrinfo hints, *ai0, *ai;
452 int gai;
453 int cnt = 0;
455 get_host_and_port(&host, &port);
456 if (!*port)
457 port = "<none>";
459 memset(&hints, 0, sizeof(hints));
460 if (flags & CONNECT_IPV4)
461 hints.ai_family = AF_INET;
462 else if (flags & CONNECT_IPV6)
463 hints.ai_family = AF_INET6;
464 hints.ai_socktype = SOCK_STREAM;
465 hints.ai_protocol = IPPROTO_TCP;
467 if (flags & CONNECT_VERBOSE)
468 fprintf(stderr, "Looking up %s ... ", host);
470 gai = getaddrinfo(host, port, &hints, &ai);
471 if (gai)
472 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
474 if (flags & CONNECT_VERBOSE)
475 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
477 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
478 sockfd = socket(ai->ai_family,
479 ai->ai_socktype, ai->ai_protocol);
480 if ((sockfd < 0) ||
481 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
482 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
483 host, cnt, ai_name(ai), strerror(errno));
484 if (0 <= sockfd)
485 close(sockfd);
486 sockfd = -1;
487 continue;
489 if (flags & CONNECT_VERBOSE)
490 fprintf(stderr, "%s ", ai_name(ai));
491 break;
494 freeaddrinfo(ai0);
496 if (sockfd < 0)
497 die("unable to connect to %s:\n%s", host, error_message.buf);
499 enable_keepalive(sockfd);
501 if (flags & CONNECT_VERBOSE)
502 fprintf(stderr, "done.\n");
504 strbuf_release(&error_message);
506 return sockfd;
509 #else /* NO_IPV6 */
512 * Returns a connected socket() fd, or else die()s.
514 static int git_tcp_connect_sock(char *host, int flags)
516 struct strbuf error_message = STRBUF_INIT;
517 int sockfd = -1;
518 const char *port = STR(DEFAULT_GIT_PORT);
519 char *ep;
520 struct hostent *he;
521 struct sockaddr_in sa;
522 char **ap;
523 unsigned int nport;
524 int cnt;
526 get_host_and_port(&host, &port);
528 if (flags & CONNECT_VERBOSE)
529 fprintf(stderr, "Looking up %s ... ", host);
531 he = gethostbyname(host);
532 if (!he)
533 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
534 nport = strtoul(port, &ep, 10);
535 if ( ep == port || *ep ) {
536 /* Not numeric */
537 struct servent *se = getservbyname(port,"tcp");
538 if ( !se )
539 die("Unknown port %s", port);
540 nport = se->s_port;
543 if (flags & CONNECT_VERBOSE)
544 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
546 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
547 memset(&sa, 0, sizeof sa);
548 sa.sin_family = he->h_addrtype;
549 sa.sin_port = htons(nport);
550 memcpy(&sa.sin_addr, *ap, he->h_length);
552 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
553 if ((sockfd < 0) ||
554 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
555 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
556 host,
557 cnt,
558 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
559 strerror(errno));
560 if (0 <= sockfd)
561 close(sockfd);
562 sockfd = -1;
563 continue;
565 if (flags & CONNECT_VERBOSE)
566 fprintf(stderr, "%s ",
567 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
568 break;
571 if (sockfd < 0)
572 die("unable to connect to %s:\n%s", host, error_message.buf);
574 enable_keepalive(sockfd);
576 if (flags & CONNECT_VERBOSE)
577 fprintf(stderr, "done.\n");
579 return sockfd;
582 #endif /* NO_IPV6 */
586 * Dummy child_process returned by git_connect() if the transport protocol
587 * does not need fork(2).
589 static struct child_process no_fork = CHILD_PROCESS_INIT;
591 int git_connection_is_socket(struct child_process *conn)
593 return conn == &no_fork;
596 static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
598 int sockfd = git_tcp_connect_sock(host, flags);
600 fd[0] = sockfd;
601 fd[1] = dup(sockfd);
603 return &no_fork;
607 static char *git_proxy_command;
609 static int git_proxy_command_options(const char *var, const char *value,
610 void *cb)
612 if (!strcmp(var, "core.gitproxy")) {
613 const char *for_pos;
614 int matchlen = -1;
615 int hostlen;
616 const char *rhost_name = cb;
617 int rhost_len = strlen(rhost_name);
619 if (git_proxy_command)
620 return 0;
621 if (!value)
622 return config_error_nonbool(var);
623 /* [core]
624 * ;# matches www.kernel.org as well
625 * gitproxy = netcatter-1 for kernel.org
626 * gitproxy = netcatter-2 for sample.xz
627 * gitproxy = netcatter-default
629 for_pos = strstr(value, " for ");
630 if (!for_pos)
631 /* matches everybody */
632 matchlen = strlen(value);
633 else {
634 hostlen = strlen(for_pos + 5);
635 if (rhost_len < hostlen)
636 matchlen = -1;
637 else if (!strncmp(for_pos + 5,
638 rhost_name + rhost_len - hostlen,
639 hostlen) &&
640 ((rhost_len == hostlen) ||
641 rhost_name[rhost_len - hostlen -1] == '.'))
642 matchlen = for_pos - value;
643 else
644 matchlen = -1;
646 if (0 <= matchlen) {
647 /* core.gitproxy = none for kernel.org */
648 if (matchlen == 4 &&
649 !memcmp(value, "none", 4))
650 matchlen = 0;
651 git_proxy_command = xmemdupz(value, matchlen);
653 return 0;
656 return git_default_config(var, value, cb);
659 static int git_use_proxy(const char *host)
661 git_proxy_command = getenv("GIT_PROXY_COMMAND");
662 git_config(git_proxy_command_options, (void*)host);
663 return (git_proxy_command && *git_proxy_command);
666 static struct child_process *git_proxy_connect(int fd[2], char *host)
668 const char *port = STR(DEFAULT_GIT_PORT);
669 struct child_process *proxy;
671 get_host_and_port(&host, &port);
673 if (looks_like_command_line_option(host))
674 die("strange hostname '%s' blocked", host);
675 if (looks_like_command_line_option(port))
676 die("strange port '%s' blocked", port);
678 proxy = xmalloc(sizeof(*proxy));
679 child_process_init(proxy);
680 argv_array_push(&proxy->args, git_proxy_command);
681 argv_array_push(&proxy->args, host);
682 argv_array_push(&proxy->args, port);
683 proxy->in = -1;
684 proxy->out = -1;
685 if (start_command(proxy))
686 die("cannot start proxy %s", git_proxy_command);
687 fd[0] = proxy->out; /* read from proxy stdout */
688 fd[1] = proxy->in; /* write to proxy stdin */
689 return proxy;
692 static char *get_port(char *host)
694 char *end;
695 char *p = strchr(host, ':');
697 if (p) {
698 long port = strtol(p + 1, &end, 10);
699 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
700 *p = '\0';
701 return p+1;
705 return NULL;
709 * Extract protocol and relevant parts from the specified connection URL.
710 * The caller must free() the returned strings.
712 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
713 char **ret_path)
715 char *url;
716 char *host, *path;
717 char *end;
718 int separator = '/';
719 enum protocol protocol = PROTO_LOCAL;
721 if (is_url(url_orig))
722 url = url_decode(url_orig);
723 else
724 url = xstrdup(url_orig);
726 host = strstr(url, "://");
727 if (host) {
728 *host = '\0';
729 protocol = get_protocol(url);
730 host += 3;
731 } else {
732 host = url;
733 if (!url_is_local_not_ssh(url)) {
734 protocol = PROTO_SSH;
735 separator = ':';
740 * Don't do destructive transforms as protocol code does
741 * '[]' unwrapping in get_host_and_port()
743 end = host_end(&host, 0);
745 if (protocol == PROTO_LOCAL)
746 path = end;
747 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
748 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
749 else
750 path = strchr(end, separator);
752 if (!path || !*path)
753 die("No path specified. See 'man git-pull' for valid url syntax");
756 * null-terminate hostname and point path to ~ for URL's like this:
757 * ssh://host.xz/~user/repo
760 end = path; /* Need to \0 terminate host here */
761 if (separator == ':')
762 path++; /* path starts after ':' */
763 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
764 if (path[1] == '~')
765 path++;
768 path = xstrdup(path);
769 *end = '\0';
771 *ret_host = xstrdup(host);
772 *ret_path = path;
773 free(url);
774 return protocol;
777 static const char *get_ssh_command(void)
779 const char *ssh;
781 if ((ssh = getenv("GIT_SSH_COMMAND")))
782 return ssh;
784 if (!git_config_get_string_const("core.sshcommand", &ssh))
785 return ssh;
787 return NULL;
790 enum ssh_variant {
791 VARIANT_AUTO,
792 VARIANT_SIMPLE,
793 VARIANT_SSH,
794 VARIANT_PLINK,
795 VARIANT_PUTTY,
796 VARIANT_TORTOISEPLINK,
799 static void override_ssh_variant(enum ssh_variant *ssh_variant)
801 const char *variant = getenv("GIT_SSH_VARIANT");
803 if (!variant && git_config_get_string_const("ssh.variant", &variant))
804 return;
806 if (!strcmp(variant, "auto"))
807 *ssh_variant = VARIANT_AUTO;
808 else if (!strcmp(variant, "plink"))
809 *ssh_variant = VARIANT_PLINK;
810 else if (!strcmp(variant, "putty"))
811 *ssh_variant = VARIANT_PUTTY;
812 else if (!strcmp(variant, "tortoiseplink"))
813 *ssh_variant = VARIANT_TORTOISEPLINK;
814 else if (!strcmp(variant, "simple"))
815 *ssh_variant = VARIANT_SIMPLE;
816 else
817 *ssh_variant = VARIANT_SSH;
820 static enum ssh_variant determine_ssh_variant(const char *ssh_command,
821 int is_cmdline)
823 enum ssh_variant ssh_variant = VARIANT_AUTO;
824 const char *variant;
825 char *p = NULL;
827 override_ssh_variant(&ssh_variant);
829 if (ssh_variant != VARIANT_AUTO)
830 return ssh_variant;
832 if (!is_cmdline) {
833 p = xstrdup(ssh_command);
834 variant = basename(p);
835 } else {
836 const char **ssh_argv;
838 p = xstrdup(ssh_command);
839 if (split_cmdline(p, &ssh_argv) > 0) {
840 variant = basename((char *)ssh_argv[0]);
842 * At this point, variant points into the buffer
843 * referenced by p, hence we do not need ssh_argv
844 * any longer.
846 free(ssh_argv);
847 } else {
848 free(p);
849 return ssh_variant;
853 if (!strcasecmp(variant, "ssh") ||
854 !strcasecmp(variant, "ssh.exe"))
855 ssh_variant = VARIANT_SSH;
856 else if (!strcasecmp(variant, "plink") ||
857 !strcasecmp(variant, "plink.exe"))
858 ssh_variant = VARIANT_PLINK;
859 else if (!strcasecmp(variant, "tortoiseplink") ||
860 !strcasecmp(variant, "tortoiseplink.exe"))
861 ssh_variant = VARIANT_TORTOISEPLINK;
863 free(p);
864 return ssh_variant;
868 * Open a connection using Git's native protocol.
870 * The caller is responsible for freeing hostandport, but this function may
871 * modify it (for example, to truncate it to remove the port part).
873 static struct child_process *git_connect_git(int fd[2], char *hostandport,
874 const char *path, const char *prog,
875 int flags)
877 struct child_process *conn;
878 struct strbuf request = STRBUF_INIT;
880 * Set up virtual host information based on where we will
881 * connect, unless the user has overridden us in
882 * the environment.
884 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
885 if (target_host)
886 target_host = xstrdup(target_host);
887 else
888 target_host = xstrdup(hostandport);
890 transport_check_allowed("git");
893 * These underlying connection commands die() if they
894 * cannot connect.
896 if (git_use_proxy(hostandport))
897 conn = git_proxy_connect(fd, hostandport);
898 else
899 conn = git_tcp_connect(fd, hostandport, flags);
901 * Separate original protocol components prog and path
902 * from extended host header with a NUL byte.
904 * Note: Do not add any other headers here! Doing so
905 * will cause older git-daemon servers to crash.
907 strbuf_addf(&request,
908 "%s %s%chost=%s%c",
909 prog, path, 0,
910 target_host, 0);
912 /* If using a new version put that stuff here after a second null byte */
913 if (get_protocol_version_config() > 0) {
914 strbuf_addch(&request, '\0');
915 strbuf_addf(&request, "version=%d%c",
916 get_protocol_version_config(), '\0');
919 packet_write(fd[1], request.buf, request.len);
921 free(target_host);
922 strbuf_release(&request);
923 return conn;
927 * Append the appropriate environment variables to `env` and options to
928 * `args` for running ssh in Git's SSH-tunneled transport.
930 static void push_ssh_options(struct argv_array *args, struct argv_array *env,
931 enum ssh_variant variant, const char *port,
932 int flags)
934 if (variant == VARIANT_SSH &&
935 get_protocol_version_config() > 0) {
936 argv_array_push(args, "-o");
937 argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
938 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
939 get_protocol_version_config());
942 if (flags & CONNECT_IPV4) {
943 switch (variant) {
944 case VARIANT_AUTO:
945 BUG("VARIANT_AUTO passed to push_ssh_options");
946 case VARIANT_SIMPLE:
947 die("ssh variant 'simple' does not support -4");
948 case VARIANT_SSH:
949 case VARIANT_PLINK:
950 case VARIANT_PUTTY:
951 case VARIANT_TORTOISEPLINK:
952 argv_array_push(args, "-4");
954 } else if (flags & CONNECT_IPV6) {
955 switch (variant) {
956 case VARIANT_AUTO:
957 BUG("VARIANT_AUTO passed to push_ssh_options");
958 case VARIANT_SIMPLE:
959 die("ssh variant 'simple' does not support -6");
960 case VARIANT_SSH:
961 case VARIANT_PLINK:
962 case VARIANT_PUTTY:
963 case VARIANT_TORTOISEPLINK:
964 argv_array_push(args, "-6");
968 if (variant == VARIANT_TORTOISEPLINK)
969 argv_array_push(args, "-batch");
971 if (port) {
972 switch (variant) {
973 case VARIANT_AUTO:
974 BUG("VARIANT_AUTO passed to push_ssh_options");
975 case VARIANT_SIMPLE:
976 die("ssh variant 'simple' does not support setting port");
977 case VARIANT_SSH:
978 argv_array_push(args, "-p");
979 break;
980 case VARIANT_PLINK:
981 case VARIANT_PUTTY:
982 case VARIANT_TORTOISEPLINK:
983 argv_array_push(args, "-P");
986 argv_array_push(args, port);
990 /* Prepare a child_process for use by Git's SSH-tunneled transport. */
991 static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
992 const char *port, int flags)
994 const char *ssh;
995 enum ssh_variant variant;
997 if (looks_like_command_line_option(ssh_host))
998 die("strange hostname '%s' blocked", ssh_host);
1000 ssh = get_ssh_command();
1001 if (ssh) {
1002 variant = determine_ssh_variant(ssh, 1);
1003 } else {
1005 * GIT_SSH is the no-shell version of
1006 * GIT_SSH_COMMAND (and must remain so for
1007 * historical compatibility).
1009 conn->use_shell = 0;
1011 ssh = getenv("GIT_SSH");
1012 if (!ssh)
1013 ssh = "ssh";
1014 variant = determine_ssh_variant(ssh, 0);
1017 if (variant == VARIANT_AUTO) {
1018 struct child_process detect = CHILD_PROCESS_INIT;
1020 detect.use_shell = conn->use_shell;
1021 detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
1023 argv_array_push(&detect.args, ssh);
1024 argv_array_push(&detect.args, "-G");
1025 push_ssh_options(&detect.args, &detect.env_array,
1026 VARIANT_SSH, port, flags);
1027 argv_array_push(&detect.args, ssh_host);
1029 variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
1032 argv_array_push(&conn->args, ssh);
1033 push_ssh_options(&conn->args, &conn->env_array, variant, port, flags);
1034 argv_array_push(&conn->args, ssh_host);
1038 * This returns the dummy child_process `no_fork` if the transport protocol
1039 * does not need fork(2), or a struct child_process object if it does. Once
1040 * done, finish the connection with finish_connect() with the value returned
1041 * from this function (it is safe to call finish_connect() with NULL to
1042 * support the former case).
1044 * If it returns, the connect is successful; it just dies on errors (this
1045 * will hopefully be changed in a libification effort, to return NULL when
1046 * the connection failed).
1048 struct child_process *git_connect(int fd[2], const char *url,
1049 const char *prog, int flags)
1051 char *hostandport, *path;
1052 struct child_process *conn;
1053 enum protocol protocol;
1055 /* Without this we cannot rely on waitpid() to tell
1056 * what happened to our children.
1058 signal(SIGCHLD, SIG_DFL);
1060 protocol = parse_connect_url(url, &hostandport, &path);
1061 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
1062 printf("Diag: url=%s\n", url ? url : "NULL");
1063 printf("Diag: protocol=%s\n", prot_name(protocol));
1064 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
1065 printf("Diag: path=%s\n", path ? path : "NULL");
1066 conn = NULL;
1067 } else if (protocol == PROTO_GIT) {
1068 conn = git_connect_git(fd, hostandport, path, prog, flags);
1069 } else {
1070 struct strbuf cmd = STRBUF_INIT;
1071 const char *const *var;
1073 conn = xmalloc(sizeof(*conn));
1074 child_process_init(conn);
1076 if (looks_like_command_line_option(path))
1077 die("strange pathname '%s' blocked", path);
1079 strbuf_addstr(&cmd, prog);
1080 strbuf_addch(&cmd, ' ');
1081 sq_quote_buf(&cmd, path);
1083 /* remove repo-local variables from the environment */
1084 for (var = local_repo_env; *var; var++)
1085 argv_array_push(&conn->env_array, *var);
1087 conn->use_shell = 1;
1088 conn->in = conn->out = -1;
1089 if (protocol == PROTO_SSH) {
1090 char *ssh_host = hostandport;
1091 const char *port = NULL;
1092 transport_check_allowed("ssh");
1093 get_host_and_port(&ssh_host, &port);
1095 if (!port)
1096 port = get_port(ssh_host);
1098 if (flags & CONNECT_DIAG_URL) {
1099 printf("Diag: url=%s\n", url ? url : "NULL");
1100 printf("Diag: protocol=%s\n", prot_name(protocol));
1101 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
1102 printf("Diag: port=%s\n", port ? port : "NONE");
1103 printf("Diag: path=%s\n", path ? path : "NULL");
1105 free(hostandport);
1106 free(path);
1107 free(conn);
1108 strbuf_release(&cmd);
1109 return NULL;
1111 fill_ssh_args(conn, ssh_host, port, flags);
1112 } else {
1113 transport_check_allowed("file");
1114 if (get_protocol_version_config() > 0) {
1115 argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
1116 get_protocol_version_config());
1119 argv_array_push(&conn->args, cmd.buf);
1121 if (start_command(conn))
1122 die("unable to fork");
1124 fd[0] = conn->out; /* read from child's stdout */
1125 fd[1] = conn->in; /* write to child's stdin */
1126 strbuf_release(&cmd);
1128 free(hostandport);
1129 free(path);
1130 return conn;
1133 int finish_connect(struct child_process *conn)
1135 int code;
1136 if (!conn || git_connection_is_socket(conn))
1137 return 0;
1139 code = finish_command(conn);
1140 free(conn);
1141 return code;