Merge branch 'cb/maint-orphan-merge-noclobber'
[git/kirr.git] / connect.c
blob57dc20c43ca1ba205ec0a18e263f9dde081390f4
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_ref_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++;
53 * Read all the refs from the other end
55 struct ref **get_remote_heads(int in, struct ref **list,
56 int nr_match, char **match,
57 unsigned int flags,
58 struct extra_have_objects *extra_have)
60 *list = NULL;
61 for (;;) {
62 struct ref *ref;
63 unsigned char old_sha1[20];
64 static char buffer[1000];
65 char *name;
66 int len, name_len;
68 len = packet_read_line(in, buffer, sizeof(buffer));
69 if (!len)
70 break;
71 if (buffer[len-1] == '\n')
72 buffer[--len] = 0;
74 if (len > 4 && !prefixcmp(buffer, "ERR "))
75 die("remote error: %s", buffer + 4);
77 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
78 die("protocol error: expected sha/ref, got '%s'", buffer);
79 name = buffer + 41;
81 name_len = strlen(name);
82 if (len != name_len + 41) {
83 free(server_capabilities);
84 server_capabilities = xstrdup(name + name_len + 1);
87 if (extra_have &&
88 name_len == 5 && !memcmp(".have", name, 5)) {
89 add_extra_have(extra_have, old_sha1);
90 continue;
93 if (!check_ref(name, name_len, flags))
94 continue;
95 if (nr_match && !path_match(name, nr_match, match))
96 continue;
97 ref = alloc_ref(buffer + 41);
98 hashcpy(ref->old_sha1, old_sha1);
99 *list = ref;
100 list = &ref->next;
102 return list;
105 int server_supports(const char *feature)
107 return server_capabilities &&
108 strstr(server_capabilities, feature) != NULL;
111 int path_match(const char *path, int nr, char **match)
113 int i;
114 int pathlen = strlen(path);
116 for (i = 0; i < nr; i++) {
117 char *s = match[i];
118 int len = strlen(s);
120 if (!len || len > pathlen)
121 continue;
122 if (memcmp(path + pathlen - len, s, len))
123 continue;
124 if (pathlen > len && path[pathlen - len - 1] != '/')
125 continue;
126 *s = 0;
127 return (i + 1);
129 return 0;
132 enum protocol {
133 PROTO_LOCAL = 1,
134 PROTO_SSH,
135 PROTO_GIT
138 static enum protocol get_protocol(const char *name)
140 if (!strcmp(name, "ssh"))
141 return PROTO_SSH;
142 if (!strcmp(name, "git"))
143 return PROTO_GIT;
144 if (!strcmp(name, "git+ssh"))
145 return PROTO_SSH;
146 if (!strcmp(name, "ssh+git"))
147 return PROTO_SSH;
148 if (!strcmp(name, "file"))
149 return PROTO_LOCAL;
150 die("I don't handle protocol '%s'", name);
153 #define STR_(s) # s
154 #define STR(s) STR_(s)
156 static void get_host_and_port(char **host, const char **port)
158 char *colon, *end;
160 if (*host[0] == '[') {
161 end = strchr(*host + 1, ']');
162 if (end) {
163 *end = 0;
164 end++;
165 (*host)++;
166 } else
167 end = *host;
168 } else
169 end = *host;
170 colon = strchr(end, ':');
172 if (colon) {
173 *colon = 0;
174 *port = colon + 1;
178 #ifndef NO_IPV6
180 static const char *ai_name(const struct addrinfo *ai)
182 static char addr[NI_MAXHOST];
183 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
184 NI_NUMERICHOST) != 0)
185 strcpy(addr, "(unknown)");
187 return addr;
191 * Returns a connected socket() fd, or else die()s.
193 static int git_tcp_connect_sock(char *host, int flags)
195 int sockfd = -1, saved_errno = 0;
196 const char *port = STR(DEFAULT_GIT_PORT);
197 struct addrinfo hints, *ai0, *ai;
198 int gai;
199 int cnt = 0;
201 get_host_and_port(&host, &port);
202 if (!*port)
203 port = "<none>";
205 memset(&hints, 0, sizeof(hints));
206 hints.ai_socktype = SOCK_STREAM;
207 hints.ai_protocol = IPPROTO_TCP;
209 if (flags & CONNECT_VERBOSE)
210 fprintf(stderr, "Looking up %s ... ", host);
212 gai = getaddrinfo(host, port, &hints, &ai);
213 if (gai)
214 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
216 if (flags & CONNECT_VERBOSE)
217 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
219 for (ai0 = ai; ai; ai = ai->ai_next) {
220 sockfd = socket(ai->ai_family,
221 ai->ai_socktype, ai->ai_protocol);
222 if (sockfd < 0) {
223 saved_errno = errno;
224 continue;
226 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
227 saved_errno = errno;
228 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
229 host,
230 cnt,
231 ai_name(ai),
232 strerror(saved_errno));
233 close(sockfd);
234 sockfd = -1;
235 continue;
237 if (flags & CONNECT_VERBOSE)
238 fprintf(stderr, "%s ", ai_name(ai));
239 break;
242 freeaddrinfo(ai0);
244 if (sockfd < 0)
245 die("unable to connect a socket (%s)", strerror(saved_errno));
247 if (flags & CONNECT_VERBOSE)
248 fprintf(stderr, "done.\n");
250 return sockfd;
253 #else /* NO_IPV6 */
256 * Returns a connected socket() fd, or else die()s.
258 static int git_tcp_connect_sock(char *host, int flags)
260 int sockfd = -1, saved_errno = 0;
261 const char *port = STR(DEFAULT_GIT_PORT);
262 char *ep;
263 struct hostent *he;
264 struct sockaddr_in sa;
265 char **ap;
266 unsigned int nport;
267 int cnt;
269 get_host_and_port(&host, &port);
271 if (flags & CONNECT_VERBOSE)
272 fprintf(stderr, "Looking up %s ... ", host);
274 he = gethostbyname(host);
275 if (!he)
276 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
277 nport = strtoul(port, &ep, 10);
278 if ( ep == port || *ep ) {
279 /* Not numeric */
280 struct servent *se = getservbyname(port,"tcp");
281 if ( !se )
282 die("Unknown port %s", port);
283 nport = se->s_port;
286 if (flags & CONNECT_VERBOSE)
287 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
289 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
290 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
291 if (sockfd < 0) {
292 saved_errno = errno;
293 continue;
296 memset(&sa, 0, sizeof sa);
297 sa.sin_family = he->h_addrtype;
298 sa.sin_port = htons(nport);
299 memcpy(&sa.sin_addr, *ap, he->h_length);
301 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
302 saved_errno = errno;
303 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
304 host,
305 cnt,
306 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
307 strerror(saved_errno));
308 close(sockfd);
309 sockfd = -1;
310 continue;
312 if (flags & CONNECT_VERBOSE)
313 fprintf(stderr, "%s ",
314 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
315 break;
318 if (sockfd < 0)
319 die("unable to connect a socket (%s)", strerror(saved_errno));
321 if (flags & CONNECT_VERBOSE)
322 fprintf(stderr, "done.\n");
324 return sockfd;
327 #endif /* NO_IPV6 */
330 static void git_tcp_connect(int fd[2], char *host, int flags)
332 int sockfd = git_tcp_connect_sock(host, flags);
334 fd[0] = sockfd;
335 fd[1] = dup(sockfd);
339 static char *git_proxy_command;
341 static int git_proxy_command_options(const char *var, const char *value,
342 void *cb)
344 if (!strcmp(var, "core.gitproxy")) {
345 const char *for_pos;
346 int matchlen = -1;
347 int hostlen;
348 const char *rhost_name = cb;
349 int rhost_len = strlen(rhost_name);
351 if (git_proxy_command)
352 return 0;
353 if (!value)
354 return config_error_nonbool(var);
355 /* [core]
356 * ;# matches www.kernel.org as well
357 * gitproxy = netcatter-1 for kernel.org
358 * gitproxy = netcatter-2 for sample.xz
359 * gitproxy = netcatter-default
361 for_pos = strstr(value, " for ");
362 if (!for_pos)
363 /* matches everybody */
364 matchlen = strlen(value);
365 else {
366 hostlen = strlen(for_pos + 5);
367 if (rhost_len < hostlen)
368 matchlen = -1;
369 else if (!strncmp(for_pos + 5,
370 rhost_name + rhost_len - hostlen,
371 hostlen) &&
372 ((rhost_len == hostlen) ||
373 rhost_name[rhost_len - hostlen -1] == '.'))
374 matchlen = for_pos - value;
375 else
376 matchlen = -1;
378 if (0 <= matchlen) {
379 /* core.gitproxy = none for kernel.org */
380 if (matchlen == 4 &&
381 !memcmp(value, "none", 4))
382 matchlen = 0;
383 git_proxy_command = xmemdupz(value, matchlen);
385 return 0;
388 return git_default_config(var, value, cb);
391 static int git_use_proxy(const char *host)
393 git_proxy_command = getenv("GIT_PROXY_COMMAND");
394 git_config(git_proxy_command_options, (void*)host);
395 return (git_proxy_command && *git_proxy_command);
398 static void git_proxy_connect(int fd[2], char *host)
400 const char *port = STR(DEFAULT_GIT_PORT);
401 const char *argv[4];
402 struct child_process proxy;
404 get_host_and_port(&host, &port);
406 argv[0] = git_proxy_command;
407 argv[1] = host;
408 argv[2] = port;
409 argv[3] = NULL;
410 memset(&proxy, 0, sizeof(proxy));
411 proxy.argv = argv;
412 proxy.in = -1;
413 proxy.out = -1;
414 if (start_command(&proxy))
415 die("cannot start proxy %s", argv[0]);
416 fd[0] = proxy.out; /* read from proxy stdout */
417 fd[1] = proxy.in; /* write to proxy stdin */
420 #define MAX_CMD_LEN 1024
422 static char *get_port(char *host)
424 char *end;
425 char *p = strchr(host, ':');
427 if (p) {
428 long port = strtol(p + 1, &end, 10);
429 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
430 *p = '\0';
431 return p+1;
435 return NULL;
438 static struct child_process no_fork;
441 * This returns a dummy child_process if the transport protocol does not
442 * need fork(2), or a struct child_process object if it does. Once done,
443 * finish the connection with finish_connect() with the value returned from
444 * this function (it is safe to call finish_connect() with NULL to support
445 * the former case).
447 * If it returns, the connect is successful; it just dies on errors (this
448 * will hopefully be changed in a libification effort, to return NULL when
449 * the connection failed).
451 struct child_process *git_connect(int fd[2], const char *url_orig,
452 const char *prog, int flags)
454 char *url;
455 char *host, *path;
456 char *end;
457 int c;
458 struct child_process *conn;
459 enum protocol protocol = PROTO_LOCAL;
460 int free_path = 0;
461 char *port = NULL;
462 const char **arg;
463 struct strbuf cmd;
465 /* Without this we cannot rely on waitpid() to tell
466 * what happened to our children.
468 signal(SIGCHLD, SIG_DFL);
470 if (is_url(url_orig))
471 url = url_decode(url_orig);
472 else
473 url = xstrdup(url_orig);
475 host = strstr(url, "://");
476 if (host) {
477 *host = '\0';
478 protocol = get_protocol(url);
479 host += 3;
480 c = '/';
481 } else {
482 host = url;
483 c = ':';
487 * Don't do destructive transforms with git:// as that
488 * protocol code does '[]' unwrapping of its own.
490 if (host[0] == '[') {
491 end = strchr(host + 1, ']');
492 if (end) {
493 if (protocol != PROTO_GIT) {
494 *end = 0;
495 host++;
497 end++;
498 } else
499 end = host;
500 } else
501 end = host;
503 path = strchr(end, c);
504 if (path && !has_dos_drive_prefix(end)) {
505 if (c == ':') {
506 protocol = PROTO_SSH;
507 *path++ = '\0';
509 } else
510 path = end;
512 if (!path || !*path)
513 die("No path specified. See 'man git-pull' for valid url syntax");
516 * null-terminate hostname and point path to ~ for URL's like this:
517 * ssh://host.xz/~user/repo
519 if (protocol != PROTO_LOCAL && host != url) {
520 char *ptr = path;
521 if (path[1] == '~')
522 path++;
523 else {
524 path = xstrdup(ptr);
525 free_path = 1;
528 *ptr = '\0';
532 * Add support for ssh port: ssh://host.xy:<port>/...
534 if (protocol == PROTO_SSH && host != url)
535 port = get_port(host);
537 if (protocol == PROTO_GIT) {
538 /* These underlying connection commands die() if they
539 * cannot connect.
541 char *target_host = xstrdup(host);
542 if (git_use_proxy(host))
543 git_proxy_connect(fd, host);
544 else
545 git_tcp_connect(fd, host, flags);
547 * Separate original protocol components prog and path
548 * from extended host header with a NUL byte.
550 * Note: Do not add any other headers here! Doing so
551 * will cause older git-daemon servers to crash.
553 packet_write(fd[1],
554 "%s %s%chost=%s%c",
555 prog, path, 0,
556 target_host, 0);
557 free(target_host);
558 free(url);
559 if (free_path)
560 free(path);
561 return &no_fork;
564 conn = xcalloc(1, sizeof(*conn));
566 strbuf_init(&cmd, MAX_CMD_LEN);
567 strbuf_addstr(&cmd, prog);
568 strbuf_addch(&cmd, ' ');
569 sq_quote_buf(&cmd, path);
570 if (cmd.len >= MAX_CMD_LEN)
571 die("command line too long");
573 conn->in = conn->out = -1;
574 conn->argv = arg = xcalloc(7, sizeof(*arg));
575 if (protocol == PROTO_SSH) {
576 const char *ssh = getenv("GIT_SSH");
577 int putty = ssh && strcasestr(ssh, "plink");
578 if (!ssh) ssh = "ssh";
580 *arg++ = ssh;
581 if (putty && !strcasestr(ssh, "tortoiseplink"))
582 *arg++ = "-batch";
583 if (port) {
584 /* P is for PuTTY, p is for OpenSSH */
585 *arg++ = putty ? "-P" : "-p";
586 *arg++ = port;
588 *arg++ = host;
590 else {
591 /* remove repo-local variables from the environment */
592 conn->env = local_repo_env;
593 conn->use_shell = 1;
595 *arg++ = cmd.buf;
596 *arg = NULL;
598 if (start_command(conn))
599 die("unable to fork");
601 fd[0] = conn->out; /* read from child's stdout */
602 fd[1] = conn->in; /* write to child's stdin */
603 strbuf_release(&cmd);
604 free(url);
605 if (free_path)
606 free(path);
607 return conn;
610 int finish_connect(struct child_process *conn)
612 int code;
613 if (!conn || conn == &no_fork)
614 return 0;
616 code = finish_command(conn);
617 free(conn->argv);
618 free(conn);
619 return code;
622 char *git_getpass(const char *prompt)
624 const char *askpass;
625 struct child_process pass;
626 const char *args[3];
627 static struct strbuf buffer = STRBUF_INIT;
629 askpass = getenv("GIT_ASKPASS");
630 if (!askpass)
631 askpass = askpass_program;
632 if (!askpass)
633 askpass = getenv("SSH_ASKPASS");
634 if (!askpass || !(*askpass)) {
635 char *result = getpass(prompt);
636 if (!result)
637 die_errno("Could not read password");
638 return result;
641 args[0] = askpass;
642 args[1] = prompt;
643 args[2] = NULL;
645 memset(&pass, 0, sizeof(pass));
646 pass.argv = args;
647 pass.out = -1;
649 if (start_command(&pass))
650 exit(1);
652 strbuf_reset(&buffer);
653 if (strbuf_read(&buffer, pass.out, 20) < 0)
654 die("failed to read password from %s\n", askpass);
656 close(pass.out);
658 if (finish_command(&pass))
659 exit(1);
661 strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
663 return buffer.buf;