connect.c: Support PuTTY plink and TortoisePlink as SSH on Windows
[git.git] / connect.c
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
9 static char *server_capabilities;
10
11 static int check_ref(const char *name, int len, unsigned int flags)
12 {
13 if (!flags)
14 return 1;
15
16 if (len < 5 || memcmp(name, "refs/", 5))
17 return 0;
18
19 /* Skip the "refs/" part */
20 name += 5;
21 len -= 5;
22
23 /* REF_NORMAL means that we don't want the magic fake tag refs */
24 if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
25 return 0;
26
27 /* REF_HEADS means that we want regular branch heads */
28 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
29 return 1;
30
31 /* REF_TAGS means that we want tags */
32 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
33 return 1;
34
35 /* All type bits clear means that we are ok with anything */
36 return !(flags & ~REF_NORMAL);
37 }
38
39 int check_ref_type(const struct ref *ref, int flags)
40 {
41 return check_ref(ref->name, strlen(ref->name), flags);
42 }
43
44 static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
45 {
46 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
47 hashcpy(&(extra->array[extra->nr][0]), sha1);
48 extra->nr++;
49 }
50
51 /*
52 * Read all the refs from the other end
53 */
54 struct ref **get_remote_heads(int in, struct ref **list,
55 int nr_match, char **match,
56 unsigned int flags,
57 struct extra_have_objects *extra_have)
58 {
59 *list = NULL;
60 for (;;) {
61 struct ref *ref;
62 unsigned char old_sha1[20];
63 static char buffer[1000];
64 char *name;
65 int len, name_len;
66
67 len = packet_read_line(in, buffer, sizeof(buffer));
68 if (!len)
69 break;
70 if (buffer[len-1] == '\n')
71 buffer[--len] = 0;
72
73 if (len > 4 && !prefixcmp(buffer, "ERR "))
74 die("remote error: %s", buffer + 4);
75
76 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
77 die("protocol error: expected sha/ref, got '%s'", buffer);
78 name = buffer + 41;
79
80 name_len = strlen(name);
81 if (len != name_len + 41) {
82 free(server_capabilities);
83 server_capabilities = xstrdup(name + name_len + 1);
84 }
85
86 if (extra_have &&
87 name_len == 5 && !memcmp(".have", name, 5)) {
88 add_extra_have(extra_have, old_sha1);
89 continue;
90 }
91
92 if (!check_ref(name, name_len, flags))
93 continue;
94 if (nr_match && !path_match(name, nr_match, match))
95 continue;
96 ref = alloc_ref(buffer + 41);
97 hashcpy(ref->old_sha1, old_sha1);
98 *list = ref;
99 list = &ref->next;
100 }
101 return list;
102 }
103
104 int server_supports(const char *feature)
105 {
106 return server_capabilities &&
107 strstr(server_capabilities, feature) != NULL;
108 }
109
110 int get_ack(int fd, unsigned char *result_sha1)
111 {
112 static char line[1000];
113 int len = packet_read_line(fd, line, sizeof(line));
114
115 if (!len)
116 die("git fetch-pack: expected ACK/NAK, got EOF");
117 if (line[len-1] == '\n')
118 line[--len] = 0;
119 if (!strcmp(line, "NAK"))
120 return 0;
121 if (!prefixcmp(line, "ACK ")) {
122 if (!get_sha1_hex(line+4, result_sha1)) {
123 if (strstr(line+45, "continue"))
124 return 2;
125 return 1;
126 }
127 }
128 die("git fetch_pack: expected ACK/NAK, got '%s'", line);
129 }
130
131 int path_match(const char *path, int nr, char **match)
132 {
133 int i;
134 int pathlen = strlen(path);
135
136 for (i = 0; i < nr; i++) {
137 char *s = match[i];
138 int len = strlen(s);
139
140 if (!len || len > pathlen)
141 continue;
142 if (memcmp(path + pathlen - len, s, len))
143 continue;
144 if (pathlen > len && path[pathlen - len - 1] != '/')
145 continue;
146 *s = 0;
147 return (i + 1);
148 }
149 return 0;
150 }
151
152 enum protocol {
153 PROTO_LOCAL = 1,
154 PROTO_SSH,
155 PROTO_GIT,
156 };
157
158 static enum protocol get_protocol(const char *name)
159 {
160 if (!strcmp(name, "ssh"))
161 return PROTO_SSH;
162 if (!strcmp(name, "git"))
163 return PROTO_GIT;
164 if (!strcmp(name, "git+ssh"))
165 return PROTO_SSH;
166 if (!strcmp(name, "ssh+git"))
167 return PROTO_SSH;
168 if (!strcmp(name, "file"))
169 return PROTO_LOCAL;
170 die("I don't handle protocol '%s'", name);
171 }
172
173 #define STR_(s) # s
174 #define STR(s) STR_(s)
175
176 #ifndef NO_IPV6
177
178 static const char *ai_name(const struct addrinfo *ai)
179 {
180 static char addr[NI_MAXHOST];
181 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
182 NI_NUMERICHOST) != 0)
183 strcpy(addr, "(unknown)");
184
185 return addr;
186 }
187
188 /*
189 * Returns a connected socket() fd, or else die()s.
190 */
191 static int git_tcp_connect_sock(char *host, int flags)
192 {
193 int sockfd = -1, saved_errno = 0;
194 char *colon, *end;
195 const char *port = STR(DEFAULT_GIT_PORT);
196 struct addrinfo hints, *ai0, *ai;
197 int gai;
198 int cnt = 0;
199
200 if (host[0] == '[') {
201 end = strchr(host + 1, ']');
202 if (end) {
203 *end = 0;
204 end++;
205 host++;
206 } else
207 end = host;
208 } else
209 end = host;
210 colon = strchr(end, ':');
211
212 if (colon) {
213 *colon = 0;
214 port = colon + 1;
215 if (!*port)
216 port = "<none>";
217 }
218
219 memset(&hints, 0, sizeof(hints));
220 hints.ai_socktype = SOCK_STREAM;
221 hints.ai_protocol = IPPROTO_TCP;
222
223 if (flags & CONNECT_VERBOSE)
224 fprintf(stderr, "Looking up %s ... ", host);
225
226 gai = getaddrinfo(host, port, &hints, &ai);
227 if (gai)
228 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
229
230 if (flags & CONNECT_VERBOSE)
231 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
232
233 for (ai0 = ai; ai; ai = ai->ai_next) {
234 sockfd = socket(ai->ai_family,
235 ai->ai_socktype, ai->ai_protocol);
236 if (sockfd < 0) {
237 saved_errno = errno;
238 continue;
239 }
240 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
241 saved_errno = errno;
242 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
243 host,
244 cnt,
245 ai_name(ai),
246 strerror(saved_errno));
247 close(sockfd);
248 sockfd = -1;
249 continue;
250 }
251 if (flags & CONNECT_VERBOSE)
252 fprintf(stderr, "%s ", ai_name(ai));
253 break;
254 }
255
256 freeaddrinfo(ai0);
257
258 if (sockfd < 0)
259 die("unable to connect a socket (%s)", strerror(saved_errno));
260
261 if (flags & CONNECT_VERBOSE)
262 fprintf(stderr, "done.\n");
263
264 return sockfd;
265 }
266
267 #else /* NO_IPV6 */
268
269 /*
270 * Returns a connected socket() fd, or else die()s.
271 */
272 static int git_tcp_connect_sock(char *host, int flags)
273 {
274 int sockfd = -1, saved_errno = 0;
275 char *colon, *end;
276 char *port = STR(DEFAULT_GIT_PORT), *ep;
277 struct hostent *he;
278 struct sockaddr_in sa;
279 char **ap;
280 unsigned int nport;
281 int cnt;
282
283 if (host[0] == '[') {
284 end = strchr(host + 1, ']');
285 if (end) {
286 *end = 0;
287 end++;
288 host++;
289 } else
290 end = host;
291 } else
292 end = host;
293 colon = strchr(end, ':');
294
295 if (colon) {
296 *colon = 0;
297 port = colon + 1;
298 }
299
300 if (flags & CONNECT_VERBOSE)
301 fprintf(stderr, "Looking up %s ... ", host);
302
303 he = gethostbyname(host);
304 if (!he)
305 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
306 nport = strtoul(port, &ep, 10);
307 if ( ep == port || *ep ) {
308 /* Not numeric */
309 struct servent *se = getservbyname(port,"tcp");
310 if ( !se )
311 die("Unknown port %s", port);
312 nport = se->s_port;
313 }
314
315 if (flags & CONNECT_VERBOSE)
316 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
317
318 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
319 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
320 if (sockfd < 0) {
321 saved_errno = errno;
322 continue;
323 }
324
325 memset(&sa, 0, sizeof sa);
326 sa.sin_family = he->h_addrtype;
327 sa.sin_port = htons(nport);
328 memcpy(&sa.sin_addr, *ap, he->h_length);
329
330 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
331 saved_errno = errno;
332 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
333 host,
334 cnt,
335 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
336 strerror(saved_errno));
337 close(sockfd);
338 sockfd = -1;
339 continue;
340 }
341 if (flags & CONNECT_VERBOSE)
342 fprintf(stderr, "%s ",
343 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
344 break;
345 }
346
347 if (sockfd < 0)
348 die("unable to connect a socket (%s)", strerror(saved_errno));
349
350 if (flags & CONNECT_VERBOSE)
351 fprintf(stderr, "done.\n");
352
353 return sockfd;
354 }
355
356 #endif /* NO_IPV6 */
357
358
359 static void git_tcp_connect(int fd[2], char *host, int flags)
360 {
361 int sockfd = git_tcp_connect_sock(host, flags);
362
363 fd[0] = sockfd;
364 fd[1] = dup(sockfd);
365 }
366
367
368 static char *git_proxy_command;
369
370 static int git_proxy_command_options(const char *var, const char *value,
371 void *cb)
372 {
373 if (!strcmp(var, "core.gitproxy")) {
374 const char *for_pos;
375 int matchlen = -1;
376 int hostlen;
377 const char *rhost_name = cb;
378 int rhost_len = strlen(rhost_name);
379
380 if (git_proxy_command)
381 return 0;
382 if (!value)
383 return config_error_nonbool(var);
384 /* [core]
385 * ;# matches www.kernel.org as well
386 * gitproxy = netcatter-1 for kernel.org
387 * gitproxy = netcatter-2 for sample.xz
388 * gitproxy = netcatter-default
389 */
390 for_pos = strstr(value, " for ");
391 if (!for_pos)
392 /* matches everybody */
393 matchlen = strlen(value);
394 else {
395 hostlen = strlen(for_pos + 5);
396 if (rhost_len < hostlen)
397 matchlen = -1;
398 else if (!strncmp(for_pos + 5,
399 rhost_name + rhost_len - hostlen,
400 hostlen) &&
401 ((rhost_len == hostlen) ||
402 rhost_name[rhost_len - hostlen -1] == '.'))
403 matchlen = for_pos - value;
404 else
405 matchlen = -1;
406 }
407 if (0 <= matchlen) {
408 /* core.gitproxy = none for kernel.org */
409 if (matchlen == 4 &&
410 !memcmp(value, "none", 4))
411 matchlen = 0;
412 git_proxy_command = xmemdupz(value, matchlen);
413 }
414 return 0;
415 }
416
417 return git_default_config(var, value, cb);
418 }
419
420 static int git_use_proxy(const char *host)
421 {
422 git_proxy_command = getenv("GIT_PROXY_COMMAND");
423 git_config(git_proxy_command_options, (void*)host);
424 return (git_proxy_command && *git_proxy_command);
425 }
426
427 static void git_proxy_connect(int fd[2], char *host)
428 {
429 const char *port = STR(DEFAULT_GIT_PORT);
430 char *colon, *end;
431 const char *argv[4];
432 struct child_process proxy;
433
434 if (host[0] == '[') {
435 end = strchr(host + 1, ']');
436 if (end) {
437 *end = 0;
438 end++;
439 host++;
440 } else
441 end = host;
442 } else
443 end = host;
444 colon = strchr(end, ':');
445
446 if (colon) {
447 *colon = 0;
448 port = colon + 1;
449 }
450
451 argv[0] = git_proxy_command;
452 argv[1] = host;
453 argv[2] = port;
454 argv[3] = NULL;
455 memset(&proxy, 0, sizeof(proxy));
456 proxy.argv = argv;
457 proxy.in = -1;
458 proxy.out = -1;
459 if (start_command(&proxy))
460 die("cannot start proxy %s", argv[0]);
461 fd[0] = proxy.out; /* read from proxy stdout */
462 fd[1] = proxy.in; /* write to proxy stdin */
463 }
464
465 #define MAX_CMD_LEN 1024
466
467 char *get_port(char *host)
468 {
469 char *end;
470 char *p = strchr(host, ':');
471
472 if (p) {
473 long port = strtol(p + 1, &end, 10);
474 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
475 *p = '\0';
476 return p+1;
477 }
478 }
479
480 return NULL;
481 }
482
483 static struct child_process no_fork;
484
485 /*
486 * This returns a dummy child_process if the transport protocol does not
487 * need fork(2), or a struct child_process object if it does. Once done,
488 * finish the connection with finish_connect() with the value returned from
489 * this function (it is safe to call finish_connect() with NULL to support
490 * the former case).
491 *
492 * If it returns, the connect is successful; it just dies on errors (this
493 * will hopefully be changed in a libification effort, to return NULL when
494 * the connection failed).
495 */
496 struct child_process *git_connect(int fd[2], const char *url_orig,
497 const char *prog, int flags)
498 {
499 char *url = xstrdup(url_orig);
500 char *host, *path;
501 char *end;
502 int c;
503 struct child_process *conn;
504 enum protocol protocol = PROTO_LOCAL;
505 int free_path = 0;
506 char *port = NULL;
507 const char **arg;
508 struct strbuf cmd;
509
510 /* Without this we cannot rely on waitpid() to tell
511 * what happened to our children.
512 */
513 signal(SIGCHLD, SIG_DFL);
514
515 host = strstr(url, "://");
516 if(host) {
517 *host = '\0';
518 protocol = get_protocol(url);
519 host += 3;
520 c = '/';
521 } else {
522 host = url;
523 c = ':';
524 }
525
526 if (host[0] == '[') {
527 end = strchr(host + 1, ']');
528 if (end) {
529 *end = 0;
530 end++;
531 host++;
532 } else
533 end = host;
534 } else
535 end = host;
536
537 path = strchr(end, c);
538 if (path && !has_dos_drive_prefix(end)) {
539 if (c == ':') {
540 protocol = PROTO_SSH;
541 *path++ = '\0';
542 }
543 } else
544 path = end;
545
546 if (!path || !*path)
547 die("No path specified. See 'man git-pull' for valid url syntax");
548
549 /*
550 * null-terminate hostname and point path to ~ for URL's like this:
551 * ssh://host.xz/~user/repo
552 */
553 if (protocol != PROTO_LOCAL && host != url) {
554 char *ptr = path;
555 if (path[1] == '~')
556 path++;
557 else {
558 path = xstrdup(ptr);
559 free_path = 1;
560 }
561
562 *ptr = '\0';
563 }
564
565 /*
566 * Add support for ssh port: ssh://host.xy:<port>/...
567 */
568 if (protocol == PROTO_SSH && host != url)
569 port = get_port(host);
570
571 if (protocol == PROTO_GIT) {
572 /* These underlying connection commands die() if they
573 * cannot connect.
574 */
575 char *target_host = xstrdup(host);
576 if (git_use_proxy(host))
577 git_proxy_connect(fd, host);
578 else
579 git_tcp_connect(fd, host, flags);
580 /*
581 * Separate original protocol components prog and path
582 * from extended components with a NUL byte.
583 */
584 packet_write(fd[1],
585 "%s %s%chost=%s%c",
586 prog, path, 0,
587 target_host, 0);
588 free(target_host);
589 free(url);
590 if (free_path)
591 free(path);
592 return &no_fork;
593 }
594
595 conn = xcalloc(1, sizeof(*conn));
596
597 strbuf_init(&cmd, MAX_CMD_LEN);
598 strbuf_addstr(&cmd, prog);
599 strbuf_addch(&cmd, ' ');
600 sq_quote_buf(&cmd, path);
601 if (cmd.len >= MAX_CMD_LEN)
602 die("command line too long");
603
604 conn->in = conn->out = -1;
605 conn->argv = arg = xcalloc(7, sizeof(*arg));
606 if (protocol == PROTO_SSH) {
607 const char *ssh = getenv("GIT_SSH");
608 int putty = ssh && strcasestr(ssh, "plink");
609 if (!ssh) ssh = "ssh";
610
611 *arg++ = ssh;
612 if (putty && !strcasestr(ssh, "tortoiseplink"))
613 *arg++ = "-batch";
614 if (port) {
615 /* P is for PuTTY, p is for OpenSSH */
616 *arg++ = putty ? "-P" : "-p";
617 *arg++ = port;
618 }
619 *arg++ = host;
620 }
621 else {
622 /* remove these from the environment */
623 const char *env[] = {
624 ALTERNATE_DB_ENVIRONMENT,
625 DB_ENVIRONMENT,
626 GIT_DIR_ENVIRONMENT,
627 GIT_WORK_TREE_ENVIRONMENT,
628 GRAFT_ENVIRONMENT,
629 INDEX_ENVIRONMENT,
630 NULL
631 };
632 conn->env = env;
633 *arg++ = "sh";
634 *arg++ = "-c";
635 }
636 *arg++ = cmd.buf;
637 *arg = NULL;
638
639 if (start_command(conn))
640 die("unable to fork");
641
642 fd[0] = conn->out; /* read from child's stdout */
643 fd[1] = conn->in; /* write to child's stdin */
644 strbuf_release(&cmd);
645 free(url);
646 if (free_path)
647 free(path);
648 return conn;
649 }
650
651 int finish_connect(struct child_process *conn)
652 {
653 int code;
654 if (!conn || conn == &no_fork)
655 return 0;
656
657 code = finish_command(conn);
658 free(conn->argv);
659 free(conn);
660 return code;
661 }