Merge tag 'v2.14.1'
[git/raj.git] / connect.c
blob49b28b83be2717027ac33570b1041604db5a062d
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"
15 static char *server_capabilities;
16 static const char *parse_feature_value(const char *, const char *, int *);
18 static int check_ref(const char *name, unsigned int flags)
20 if (!flags)
21 return 1;
23 if (!skip_prefix(name, "refs/", &name))
24 return 0;
26 /* REF_NORMAL means that we don't want the magic fake tag refs */
27 if ((flags & REF_NORMAL) && check_refname_format(name, 0))
28 return 0;
30 /* REF_HEADS means that we want regular branch heads */
31 if ((flags & REF_HEADS) && starts_with(name, "heads/"))
32 return 1;
34 /* REF_TAGS means that we want tags */
35 if ((flags & REF_TAGS) && starts_with(name, "tags/"))
36 return 1;
38 /* All type bits clear means that we are ok with anything */
39 return !(flags & ~REF_NORMAL);
42 int check_ref_type(const struct ref *ref, int flags)
44 return check_ref(ref->name, flags);
47 static void die_initial_contact(int unexpected)
49 if (unexpected)
50 die(_("The remote end hung up upon initial contact"));
51 else
52 die(_("Could not read from remote repository.\n\n"
53 "Please make sure you have the correct access rights\n"
54 "and the repository exists."));
57 static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
59 char *sym, *target;
60 struct string_list_item *item;
62 if (!len)
63 return; /* just "symref" */
64 /* e.g. "symref=HEAD:refs/heads/master" */
65 sym = xmemdupz(val, len);
66 target = strchr(sym, ':');
67 if (!target)
68 /* just "symref=something" */
69 goto reject;
70 *(target++) = '\0';
71 if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
72 check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
73 /* "symref=bogus:pair */
74 goto reject;
75 item = string_list_append_nodup(symref, sym);
76 item->util = target;
77 return;
78 reject:
79 free(sym);
80 return;
83 static void annotate_refs_with_symref_info(struct ref *ref)
85 struct string_list symref = STRING_LIST_INIT_DUP;
86 const char *feature_list = server_capabilities;
88 while (feature_list) {
89 int len;
90 const char *val;
92 val = parse_feature_value(feature_list, "symref", &len);
93 if (!val)
94 break;
95 parse_one_symref_info(&symref, val, len);
96 feature_list = val + 1;
98 string_list_sort(&symref);
100 for (; ref; ref = ref->next) {
101 struct string_list_item *item;
102 item = string_list_lookup(&symref, ref->name);
103 if (!item)
104 continue;
105 ref->symref = xstrdup((char *)item->util);
107 string_list_clear(&symref, 0);
111 * Read all the refs from the other end
113 struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
114 struct ref **list, unsigned int flags,
115 struct oid_array *extra_have,
116 struct oid_array *shallow_points)
118 struct ref **orig_list = list;
121 * A hang-up after seeing some response from the other end
122 * means that it is unexpected, as we know the other end is
123 * willing to talk to us. A hang-up before seeing any
124 * response does not necessarily mean an ACL problem, though.
126 int saw_response;
127 int got_dummy_ref_with_capabilities_declaration = 0;
129 *list = NULL;
130 for (saw_response = 0; ; saw_response = 1) {
131 struct ref *ref;
132 struct object_id old_oid;
133 char *name;
134 int len, name_len;
135 char *buffer = packet_buffer;
136 const char *arg;
138 len = packet_read(in, &src_buf, &src_len,
139 packet_buffer, sizeof(packet_buffer),
140 PACKET_READ_GENTLE_ON_EOF |
141 PACKET_READ_CHOMP_NEWLINE);
142 if (len < 0)
143 die_initial_contact(saw_response);
145 if (!len)
146 break;
148 if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
149 die("remote error: %s", arg);
151 if (len == GIT_SHA1_HEXSZ + strlen("shallow ") &&
152 skip_prefix(buffer, "shallow ", &arg)) {
153 if (get_oid_hex(arg, &old_oid))
154 die("protocol error: expected shallow sha-1, got '%s'", arg);
155 if (!shallow_points)
156 die("repository on the other end cannot be shallow");
157 oid_array_append(shallow_points, &old_oid);
158 continue;
161 if (len < GIT_SHA1_HEXSZ + 2 || get_oid_hex(buffer, &old_oid) ||
162 buffer[GIT_SHA1_HEXSZ] != ' ')
163 die("protocol error: expected sha/ref, got '%s'", buffer);
164 name = buffer + GIT_SHA1_HEXSZ + 1;
166 name_len = strlen(name);
167 if (len != name_len + GIT_SHA1_HEXSZ + 1) {
168 free(server_capabilities);
169 server_capabilities = xstrdup(name + name_len + 1);
172 if (extra_have && !strcmp(name, ".have")) {
173 oid_array_append(extra_have, &old_oid);
174 continue;
177 if (!strcmp(name, "capabilities^{}")) {
178 if (saw_response)
179 die("protocol error: unexpected capabilities^{}");
180 if (got_dummy_ref_with_capabilities_declaration)
181 die("protocol error: multiple capabilities^{}");
182 got_dummy_ref_with_capabilities_declaration = 1;
183 continue;
186 if (!check_ref(name, flags))
187 continue;
189 if (got_dummy_ref_with_capabilities_declaration)
190 die("protocol error: unexpected ref after capabilities^{}");
192 ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
193 oidcpy(&ref->old_oid, &old_oid);
194 *list = ref;
195 list = &ref->next;
198 annotate_refs_with_symref_info(*orig_list);
200 return list;
203 static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
205 int len;
207 if (!feature_list)
208 return NULL;
210 len = strlen(feature);
211 while (*feature_list) {
212 const char *found = strstr(feature_list, feature);
213 if (!found)
214 return NULL;
215 if (feature_list == found || isspace(found[-1])) {
216 const char *value = found + len;
217 /* feature with no value (e.g., "thin-pack") */
218 if (!*value || isspace(*value)) {
219 if (lenp)
220 *lenp = 0;
221 return value;
223 /* feature with a value (e.g., "agent=git/1.2.3") */
224 else if (*value == '=') {
225 value++;
226 if (lenp)
227 *lenp = strcspn(value, " \t\n");
228 return value;
231 * otherwise we matched a substring of another feature;
232 * keep looking
235 feature_list = found + 1;
237 return NULL;
240 int parse_feature_request(const char *feature_list, const char *feature)
242 return !!parse_feature_value(feature_list, feature, NULL);
245 const char *server_feature_value(const char *feature, int *len)
247 return parse_feature_value(server_capabilities, feature, len);
250 int server_supports(const char *feature)
252 return !!server_feature_value(feature, NULL);
255 enum protocol {
256 PROTO_LOCAL = 1,
257 PROTO_FILE,
258 PROTO_SSH,
259 PROTO_GIT
262 int url_is_local_not_ssh(const char *url)
264 const char *colon = strchr(url, ':');
265 const char *slash = strchr(url, '/');
266 return !colon || (slash && slash < colon) ||
267 has_dos_drive_prefix(url);
270 static const char *prot_name(enum protocol protocol)
272 switch (protocol) {
273 case PROTO_LOCAL:
274 case PROTO_FILE:
275 return "file";
276 case PROTO_SSH:
277 return "ssh";
278 case PROTO_GIT:
279 return "git";
280 default:
281 return "unknown protocol";
285 static enum protocol get_protocol(const char *name)
287 if (!strcmp(name, "ssh"))
288 return PROTO_SSH;
289 if (!strcmp(name, "git"))
290 return PROTO_GIT;
291 if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
292 return PROTO_SSH;
293 if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
294 return PROTO_SSH;
295 if (!strcmp(name, "file"))
296 return PROTO_FILE;
297 die("I don't handle protocol '%s'", name);
300 static char *host_end(char **hoststart, int removebrackets)
302 char *host = *hoststart;
303 char *end;
304 char *start = strstr(host, "@[");
305 if (start)
306 start++; /* Jump over '@' */
307 else
308 start = host;
309 if (start[0] == '[') {
310 end = strchr(start + 1, ']');
311 if (end) {
312 if (removebrackets) {
313 *end = 0;
314 memmove(start, start + 1, end - start);
315 end++;
317 } else
318 end = host;
319 } else
320 end = host;
321 return end;
324 #define STR_(s) # s
325 #define STR(s) STR_(s)
327 static void get_host_and_port(char **host, const char **port)
329 char *colon, *end;
330 end = host_end(host, 1);
331 colon = strchr(end, ':');
332 if (colon) {
333 long portnr = strtol(colon + 1, &end, 10);
334 if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
335 *colon = 0;
336 *port = colon + 1;
337 } else if (!colon[1]) {
338 *colon = 0;
343 static void enable_keepalive(int sockfd)
345 int ka = 1;
347 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
348 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
349 strerror(errno));
352 #ifndef NO_IPV6
354 static const char *ai_name(const struct addrinfo *ai)
356 static char addr[NI_MAXHOST];
357 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
358 NI_NUMERICHOST) != 0)
359 xsnprintf(addr, sizeof(addr), "(unknown)");
361 return addr;
365 * Returns a connected socket() fd, or else die()s.
367 static int git_tcp_connect_sock(char *host, int flags)
369 struct strbuf error_message = STRBUF_INIT;
370 int sockfd = -1;
371 const char *port = STR(DEFAULT_GIT_PORT);
372 struct addrinfo hints, *ai0, *ai;
373 int gai;
374 int cnt = 0;
376 get_host_and_port(&host, &port);
377 if (!*port)
378 port = "<none>";
380 memset(&hints, 0, sizeof(hints));
381 if (flags & CONNECT_IPV4)
382 hints.ai_family = AF_INET;
383 else if (flags & CONNECT_IPV6)
384 hints.ai_family = AF_INET6;
385 hints.ai_socktype = SOCK_STREAM;
386 hints.ai_protocol = IPPROTO_TCP;
388 if (flags & CONNECT_VERBOSE)
389 fprintf(stderr, "Looking up %s ... ", host);
391 gai = getaddrinfo(host, port, &hints, &ai);
392 if (gai)
393 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
395 if (flags & CONNECT_VERBOSE)
396 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
398 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
399 sockfd = socket(ai->ai_family,
400 ai->ai_socktype, ai->ai_protocol);
401 if ((sockfd < 0) ||
402 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
403 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
404 host, cnt, ai_name(ai), strerror(errno));
405 if (0 <= sockfd)
406 close(sockfd);
407 sockfd = -1;
408 continue;
410 if (flags & CONNECT_VERBOSE)
411 fprintf(stderr, "%s ", ai_name(ai));
412 break;
415 freeaddrinfo(ai0);
417 if (sockfd < 0)
418 die("unable to connect to %s:\n%s", host, error_message.buf);
420 enable_keepalive(sockfd);
422 if (flags & CONNECT_VERBOSE)
423 fprintf(stderr, "done.\n");
425 strbuf_release(&error_message);
427 return sockfd;
430 #else /* NO_IPV6 */
433 * Returns a connected socket() fd, or else die()s.
435 static int git_tcp_connect_sock(char *host, int flags)
437 struct strbuf error_message = STRBUF_INIT;
438 int sockfd = -1;
439 const char *port = STR(DEFAULT_GIT_PORT);
440 char *ep;
441 struct hostent *he;
442 struct sockaddr_in sa;
443 char **ap;
444 unsigned int nport;
445 int cnt;
447 get_host_and_port(&host, &port);
449 if (flags & CONNECT_VERBOSE)
450 fprintf(stderr, "Looking up %s ... ", host);
452 he = gethostbyname(host);
453 if (!he)
454 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
455 nport = strtoul(port, &ep, 10);
456 if ( ep == port || *ep ) {
457 /* Not numeric */
458 struct servent *se = getservbyname(port,"tcp");
459 if ( !se )
460 die("Unknown port %s", port);
461 nport = se->s_port;
464 if (flags & CONNECT_VERBOSE)
465 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
467 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
468 memset(&sa, 0, sizeof sa);
469 sa.sin_family = he->h_addrtype;
470 sa.sin_port = htons(nport);
471 memcpy(&sa.sin_addr, *ap, he->h_length);
473 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
474 if ((sockfd < 0) ||
475 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
476 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
477 host,
478 cnt,
479 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
480 strerror(errno));
481 if (0 <= sockfd)
482 close(sockfd);
483 sockfd = -1;
484 continue;
486 if (flags & CONNECT_VERBOSE)
487 fprintf(stderr, "%s ",
488 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
489 break;
492 if (sockfd < 0)
493 die("unable to connect to %s:\n%s", host, error_message.buf);
495 enable_keepalive(sockfd);
497 if (flags & CONNECT_VERBOSE)
498 fprintf(stderr, "done.\n");
500 return sockfd;
503 #endif /* NO_IPV6 */
506 static void git_tcp_connect(int fd[2], char *host, int flags)
508 int sockfd = git_tcp_connect_sock(host, flags);
510 fd[0] = sockfd;
511 fd[1] = dup(sockfd);
515 static char *git_proxy_command;
517 static int git_proxy_command_options(const char *var, const char *value,
518 void *cb)
520 if (!strcmp(var, "core.gitproxy")) {
521 const char *for_pos;
522 int matchlen = -1;
523 int hostlen;
524 const char *rhost_name = cb;
525 int rhost_len = strlen(rhost_name);
527 if (git_proxy_command)
528 return 0;
529 if (!value)
530 return config_error_nonbool(var);
531 /* [core]
532 * ;# matches www.kernel.org as well
533 * gitproxy = netcatter-1 for kernel.org
534 * gitproxy = netcatter-2 for sample.xz
535 * gitproxy = netcatter-default
537 for_pos = strstr(value, " for ");
538 if (!for_pos)
539 /* matches everybody */
540 matchlen = strlen(value);
541 else {
542 hostlen = strlen(for_pos + 5);
543 if (rhost_len < hostlen)
544 matchlen = -1;
545 else if (!strncmp(for_pos + 5,
546 rhost_name + rhost_len - hostlen,
547 hostlen) &&
548 ((rhost_len == hostlen) ||
549 rhost_name[rhost_len - hostlen -1] == '.'))
550 matchlen = for_pos - value;
551 else
552 matchlen = -1;
554 if (0 <= matchlen) {
555 /* core.gitproxy = none for kernel.org */
556 if (matchlen == 4 &&
557 !memcmp(value, "none", 4))
558 matchlen = 0;
559 git_proxy_command = xmemdupz(value, matchlen);
561 return 0;
564 return git_default_config(var, value, cb);
567 static int git_use_proxy(const char *host)
569 git_proxy_command = getenv("GIT_PROXY_COMMAND");
570 git_config(git_proxy_command_options, (void*)host);
571 return (git_proxy_command && *git_proxy_command);
574 static struct child_process *git_proxy_connect(int fd[2], char *host)
576 const char *port = STR(DEFAULT_GIT_PORT);
577 struct child_process *proxy;
579 get_host_and_port(&host, &port);
581 if (looks_like_command_line_option(host))
582 die("strange hostname '%s' blocked", host);
583 if (looks_like_command_line_option(port))
584 die("strange port '%s' blocked", port);
586 proxy = xmalloc(sizeof(*proxy));
587 child_process_init(proxy);
588 argv_array_push(&proxy->args, git_proxy_command);
589 argv_array_push(&proxy->args, host);
590 argv_array_push(&proxy->args, port);
591 proxy->in = -1;
592 proxy->out = -1;
593 if (start_command(proxy))
594 die("cannot start proxy %s", git_proxy_command);
595 fd[0] = proxy->out; /* read from proxy stdout */
596 fd[1] = proxy->in; /* write to proxy stdin */
597 return proxy;
600 static char *get_port(char *host)
602 char *end;
603 char *p = strchr(host, ':');
605 if (p) {
606 long port = strtol(p + 1, &end, 10);
607 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
608 *p = '\0';
609 return p+1;
613 return NULL;
617 * Extract protocol and relevant parts from the specified connection URL.
618 * The caller must free() the returned strings.
620 static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
621 char **ret_path)
623 char *url;
624 char *host, *path;
625 char *end;
626 int separator = '/';
627 enum protocol protocol = PROTO_LOCAL;
629 if (is_url(url_orig))
630 url = url_decode(url_orig);
631 else
632 url = xstrdup(url_orig);
634 host = strstr(url, "://");
635 if (host) {
636 *host = '\0';
637 protocol = get_protocol(url);
638 host += 3;
639 } else {
640 host = url;
641 if (!url_is_local_not_ssh(url)) {
642 protocol = PROTO_SSH;
643 separator = ':';
648 * Don't do destructive transforms as protocol code does
649 * '[]' unwrapping in get_host_and_port()
651 end = host_end(&host, 0);
653 if (protocol == PROTO_LOCAL)
654 path = end;
655 else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
656 path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
657 else
658 path = strchr(end, separator);
660 if (!path || !*path)
661 die("No path specified. See 'man git-pull' for valid url syntax");
664 * null-terminate hostname and point path to ~ for URL's like this:
665 * ssh://host.xz/~user/repo
668 end = path; /* Need to \0 terminate host here */
669 if (separator == ':')
670 path++; /* path starts after ':' */
671 if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
672 if (path[1] == '~')
673 path++;
676 path = xstrdup(path);
677 *end = '\0';
679 *ret_host = xstrdup(host);
680 *ret_path = path;
681 free(url);
682 return protocol;
685 static struct child_process no_fork = CHILD_PROCESS_INIT;
687 static const char *get_ssh_command(void)
689 const char *ssh;
691 if ((ssh = getenv("GIT_SSH_COMMAND")))
692 return ssh;
694 if (!git_config_get_string_const("core.sshcommand", &ssh))
695 return ssh;
697 return NULL;
700 static int override_ssh_variant(int *port_option, int *needs_batch)
702 char *variant;
704 variant = xstrdup_or_null(getenv("GIT_SSH_VARIANT"));
705 if (!variant &&
706 git_config_get_string("ssh.variant", &variant))
707 return 0;
709 if (!strcmp(variant, "plink") || !strcmp(variant, "putty")) {
710 *port_option = 'P';
711 *needs_batch = 0;
712 } else if (!strcmp(variant, "tortoiseplink")) {
713 *port_option = 'P';
714 *needs_batch = 1;
715 } else {
716 *port_option = 'p';
717 *needs_batch = 0;
719 free(variant);
720 return 1;
723 static void handle_ssh_variant(const char *ssh_command, int is_cmdline,
724 int *port_option, int *needs_batch)
726 const char *variant;
727 char *p = NULL;
729 if (override_ssh_variant(port_option, needs_batch))
730 return;
732 if (!is_cmdline) {
733 p = xstrdup(ssh_command);
734 variant = basename(p);
735 } else {
736 const char **ssh_argv;
738 p = xstrdup(ssh_command);
739 if (split_cmdline(p, &ssh_argv) > 0) {
740 variant = basename((char *)ssh_argv[0]);
742 * At this point, variant points into the buffer
743 * referenced by p, hence we do not need ssh_argv
744 * any longer.
746 free(ssh_argv);
747 } else {
748 free(p);
749 return;
753 if (!strcasecmp(variant, "plink") ||
754 !strcasecmp(variant, "plink.exe"))
755 *port_option = 'P';
756 else if (!strcasecmp(variant, "tortoiseplink") ||
757 !strcasecmp(variant, "tortoiseplink.exe")) {
758 *port_option = 'P';
759 *needs_batch = 1;
761 free(p);
765 * This returns a dummy child_process if the transport protocol does not
766 * need fork(2), or a struct child_process object if it does. Once done,
767 * finish the connection with finish_connect() with the value returned from
768 * this function (it is safe to call finish_connect() with NULL to support
769 * the former case).
771 * If it returns, the connect is successful; it just dies on errors (this
772 * will hopefully be changed in a libification effort, to return NULL when
773 * the connection failed).
775 struct child_process *git_connect(int fd[2], const char *url,
776 const char *prog, int flags)
778 char *hostandport, *path;
779 struct child_process *conn = &no_fork;
780 enum protocol protocol;
781 struct strbuf cmd = STRBUF_INIT;
783 /* Without this we cannot rely on waitpid() to tell
784 * what happened to our children.
786 signal(SIGCHLD, SIG_DFL);
788 protocol = parse_connect_url(url, &hostandport, &path);
789 if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
790 printf("Diag: url=%s\n", url ? url : "NULL");
791 printf("Diag: protocol=%s\n", prot_name(protocol));
792 printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
793 printf("Diag: path=%s\n", path ? path : "NULL");
794 conn = NULL;
795 } else if (protocol == PROTO_GIT) {
797 * Set up virtual host information based on where we will
798 * connect, unless the user has overridden us in
799 * the environment.
801 char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
802 if (target_host)
803 target_host = xstrdup(target_host);
804 else
805 target_host = xstrdup(hostandport);
807 transport_check_allowed("git");
809 /* These underlying connection commands die() if they
810 * cannot connect.
812 if (git_use_proxy(hostandport))
813 conn = git_proxy_connect(fd, hostandport);
814 else
815 git_tcp_connect(fd, hostandport, flags);
817 * Separate original protocol components prog and path
818 * from extended host header with a NUL byte.
820 * Note: Do not add any other headers here! Doing so
821 * will cause older git-daemon servers to crash.
823 packet_write_fmt(fd[1],
824 "%s %s%chost=%s%c",
825 prog, path, 0,
826 target_host, 0);
827 free(target_host);
828 } else {
829 conn = xmalloc(sizeof(*conn));
830 child_process_init(conn);
832 if (looks_like_command_line_option(path))
833 die("strange pathname '%s' blocked", path);
835 strbuf_addstr(&cmd, prog);
836 strbuf_addch(&cmd, ' ');
837 sq_quote_buf(&cmd, path);
839 /* remove repo-local variables from the environment */
840 conn->env = local_repo_env;
841 conn->use_shell = 1;
842 conn->in = conn->out = -1;
843 if (protocol == PROTO_SSH) {
844 const char *ssh;
845 int needs_batch = 0;
846 int port_option = 'p';
847 char *ssh_host = hostandport;
848 const char *port = NULL;
849 transport_check_allowed("ssh");
850 get_host_and_port(&ssh_host, &port);
852 if (!port)
853 port = get_port(ssh_host);
855 if (flags & CONNECT_DIAG_URL) {
856 printf("Diag: url=%s\n", url ? url : "NULL");
857 printf("Diag: protocol=%s\n", prot_name(protocol));
858 printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
859 printf("Diag: port=%s\n", port ? port : "NONE");
860 printf("Diag: path=%s\n", path ? path : "NULL");
862 free(hostandport);
863 free(path);
864 free(conn);
865 return NULL;
868 if (looks_like_command_line_option(ssh_host))
869 die("strange hostname '%s' blocked", ssh_host);
871 ssh = get_ssh_command();
872 if (ssh)
873 handle_ssh_variant(ssh, 1, &port_option,
874 &needs_batch);
875 else {
877 * GIT_SSH is the no-shell version of
878 * GIT_SSH_COMMAND (and must remain so for
879 * historical compatibility).
881 conn->use_shell = 0;
883 ssh = getenv("GIT_SSH");
884 if (!ssh)
885 ssh = "ssh";
886 else
887 handle_ssh_variant(ssh, 0,
888 &port_option,
889 &needs_batch);
892 argv_array_push(&conn->args, ssh);
893 if (flags & CONNECT_IPV4)
894 argv_array_push(&conn->args, "-4");
895 else if (flags & CONNECT_IPV6)
896 argv_array_push(&conn->args, "-6");
897 if (needs_batch)
898 argv_array_push(&conn->args, "-batch");
899 if (port) {
900 argv_array_pushf(&conn->args,
901 "-%c", port_option);
902 argv_array_push(&conn->args, port);
904 argv_array_push(&conn->args, ssh_host);
905 } else {
906 transport_check_allowed("file");
908 argv_array_push(&conn->args, cmd.buf);
910 if (start_command(conn))
911 die("unable to fork");
913 fd[0] = conn->out; /* read from child's stdout */
914 fd[1] = conn->in; /* write to child's stdin */
915 strbuf_release(&cmd);
917 free(hostandport);
918 free(path);
919 return conn;
922 int git_connection_is_socket(struct child_process *conn)
924 return conn == &no_fork;
927 int finish_connect(struct child_process *conn)
929 int code;
930 if (!conn || git_connection_is_socket(conn))
931 return 0;
933 code = finish_command(conn);
934 free(conn);
935 return code;