gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / connect.c
blob9ae991ac42544716599ff8bf3ebaaa376c8119e4
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"
9 static char *server_capabilities;
11 static int check_ref(const char *name, int len, unsigned int flags)
13 if (!flags)
14 return 1;
16 if (len < 5 || memcmp(name, "refs/", 5))
17 return 0;
19 /* Skip the "refs/" part */
20 name += 5;
21 len -= 5;
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;
27 /* REF_HEADS means that we want regular branch heads */
28 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
29 return 1;
31 /* REF_TAGS means that we want tags */
32 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
33 return 1;
35 /* All type bits clear means that we are ok with anything */
36 return !(flags & ~REF_NORMAL);
39 int check_ref_type(const struct ref *ref, int flags)
41 return check_ref(ref->name, strlen(ref->name), flags);
44 static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
46 ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
47 hashcpy(&(extra->array[extra->nr][0]), sha1);
48 extra->nr++;
52 * Read all the refs from the other end
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)
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;
67 len = packet_read_line(in, buffer, sizeof(buffer));
68 if (!len)
69 break;
70 if (buffer[len-1] == '\n')
71 buffer[--len] = 0;
73 if (len > 4 && !prefixcmp(buffer, "ERR "))
74 die("remote error: %s", buffer + 4);
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;
80 name_len = strlen(name);
81 if (len != name_len + 41) {
82 free(server_capabilities);
83 server_capabilities = xstrdup(name + name_len + 1);
86 if (extra_have &&
87 name_len == 5 && !memcmp(".have", name, 5)) {
88 add_extra_have(extra_have, old_sha1);
89 continue;
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;
101 return list;
104 int server_supports(const char *feature)
106 return server_capabilities &&
107 strstr(server_capabilities, feature) != NULL;
110 int path_match(const char *path, int nr, char **match)
112 int i;
113 int pathlen = strlen(path);
115 for (i = 0; i < nr; i++) {
116 char *s = match[i];
117 int len = strlen(s);
119 if (!len || len > pathlen)
120 continue;
121 if (memcmp(path + pathlen - len, s, len))
122 continue;
123 if (pathlen > len && path[pathlen - len - 1] != '/')
124 continue;
125 *s = 0;
126 return (i + 1);
128 return 0;
131 enum protocol {
132 PROTO_LOCAL = 1,
133 PROTO_SSH,
134 PROTO_GIT,
137 static enum protocol get_protocol(const char *name)
139 if (!strcmp(name, "ssh"))
140 return PROTO_SSH;
141 if (!strcmp(name, "git"))
142 return PROTO_GIT;
143 if (!strcmp(name, "git+ssh"))
144 return PROTO_SSH;
145 if (!strcmp(name, "ssh+git"))
146 return PROTO_SSH;
147 if (!strcmp(name, "file"))
148 return PROTO_LOCAL;
149 die("I don't handle protocol '%s'", name);
152 #define STR_(s) # s
153 #define STR(s) STR_(s)
155 static void get_host_and_port(char **host, const char **port)
157 char *colon, *end;
159 if (*host[0] == '[') {
160 end = strchr(*host + 1, ']');
161 if (end) {
162 *end = 0;
163 end++;
164 (*host)++;
165 } else
166 end = *host;
167 } else
168 end = *host;
169 colon = strchr(end, ':');
171 if (colon) {
172 *colon = 0;
173 *port = colon + 1;
177 #ifndef NO_IPV6
179 static const char *ai_name(const struct addrinfo *ai)
181 static char addr[NI_MAXHOST];
182 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
183 NI_NUMERICHOST) != 0)
184 strcpy(addr, "(unknown)");
186 return addr;
190 * Returns a connected socket() fd, or else die()s.
192 static int git_tcp_connect_sock(char *host, int flags)
194 int sockfd = -1, saved_errno = 0;
195 const char *port = STR(DEFAULT_GIT_PORT);
196 struct addrinfo hints, *ai0, *ai;
197 int gai;
198 int cnt = 0;
200 get_host_and_port(&host, &port);
201 if (!*port)
202 port = "<none>";
204 memset(&hints, 0, sizeof(hints));
205 hints.ai_socktype = SOCK_STREAM;
206 hints.ai_protocol = IPPROTO_TCP;
208 if (flags & CONNECT_VERBOSE)
209 fprintf(stderr, "Looking up %s ... ", host);
211 gai = getaddrinfo(host, port, &hints, &ai);
212 if (gai)
213 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
215 if (flags & CONNECT_VERBOSE)
216 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
218 for (ai0 = ai; ai; ai = ai->ai_next) {
219 sockfd = socket(ai->ai_family,
220 ai->ai_socktype, ai->ai_protocol);
221 if (sockfd < 0) {
222 saved_errno = errno;
223 continue;
225 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
226 saved_errno = errno;
227 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
228 host,
229 cnt,
230 ai_name(ai),
231 strerror(saved_errno));
232 close(sockfd);
233 sockfd = -1;
234 continue;
236 if (flags & CONNECT_VERBOSE)
237 fprintf(stderr, "%s ", ai_name(ai));
238 break;
241 freeaddrinfo(ai0);
243 if (sockfd < 0)
244 die("unable to connect a socket (%s)", strerror(saved_errno));
246 if (flags & CONNECT_VERBOSE)
247 fprintf(stderr, "done.\n");
249 return sockfd;
252 #else /* NO_IPV6 */
255 * Returns a connected socket() fd, or else die()s.
257 static int git_tcp_connect_sock(char *host, int flags)
259 int sockfd = -1, saved_errno = 0;
260 const char *port = STR(DEFAULT_GIT_PORT);
261 char *ep;
262 struct hostent *he;
263 struct sockaddr_in sa;
264 char **ap;
265 unsigned int nport;
266 int cnt;
268 get_host_and_port(&host, &port);
270 if (flags & CONNECT_VERBOSE)
271 fprintf(stderr, "Looking up %s ... ", host);
273 he = gethostbyname(host);
274 if (!he)
275 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
276 nport = strtoul(port, &ep, 10);
277 if ( ep == port || *ep ) {
278 /* Not numeric */
279 struct servent *se = getservbyname(port,"tcp");
280 if ( !se )
281 die("Unknown port %s", port);
282 nport = se->s_port;
285 if (flags & CONNECT_VERBOSE)
286 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
288 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
289 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
290 if (sockfd < 0) {
291 saved_errno = errno;
292 continue;
295 memset(&sa, 0, sizeof sa);
296 sa.sin_family = he->h_addrtype;
297 sa.sin_port = htons(nport);
298 memcpy(&sa.sin_addr, *ap, he->h_length);
300 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
301 saved_errno = errno;
302 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
303 host,
304 cnt,
305 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
306 strerror(saved_errno));
307 close(sockfd);
308 sockfd = -1;
309 continue;
311 if (flags & CONNECT_VERBOSE)
312 fprintf(stderr, "%s ",
313 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
314 break;
317 if (sockfd < 0)
318 die("unable to connect a socket (%s)", strerror(saved_errno));
320 if (flags & CONNECT_VERBOSE)
321 fprintf(stderr, "done.\n");
323 return sockfd;
326 #endif /* NO_IPV6 */
329 static void git_tcp_connect(int fd[2], char *host, int flags)
331 int sockfd = git_tcp_connect_sock(host, flags);
333 fd[0] = sockfd;
334 fd[1] = dup(sockfd);
338 static char *git_proxy_command;
340 static int git_proxy_command_options(const char *var, const char *value,
341 void *cb)
343 if (!strcmp(var, "core.gitproxy")) {
344 const char *for_pos;
345 int matchlen = -1;
346 int hostlen;
347 const char *rhost_name = cb;
348 int rhost_len = strlen(rhost_name);
350 if (git_proxy_command)
351 return 0;
352 if (!value)
353 return config_error_nonbool(var);
354 /* [core]
355 * ;# matches www.kernel.org as well
356 * gitproxy = netcatter-1 for kernel.org
357 * gitproxy = netcatter-2 for sample.xz
358 * gitproxy = netcatter-default
360 for_pos = strstr(value, " for ");
361 if (!for_pos)
362 /* matches everybody */
363 matchlen = strlen(value);
364 else {
365 hostlen = strlen(for_pos + 5);
366 if (rhost_len < hostlen)
367 matchlen = -1;
368 else if (!strncmp(for_pos + 5,
369 rhost_name + rhost_len - hostlen,
370 hostlen) &&
371 ((rhost_len == hostlen) ||
372 rhost_name[rhost_len - hostlen -1] == '.'))
373 matchlen = for_pos - value;
374 else
375 matchlen = -1;
377 if (0 <= matchlen) {
378 /* core.gitproxy = none for kernel.org */
379 if (matchlen == 4 &&
380 !memcmp(value, "none", 4))
381 matchlen = 0;
382 git_proxy_command = xmemdupz(value, matchlen);
384 return 0;
387 return git_default_config(var, value, cb);
390 static int git_use_proxy(const char *host)
392 git_proxy_command = getenv("GIT_PROXY_COMMAND");
393 git_config(git_proxy_command_options, (void*)host);
394 return (git_proxy_command && *git_proxy_command);
397 static void git_proxy_connect(int fd[2], char *host)
399 const char *port = STR(DEFAULT_GIT_PORT);
400 const char *argv[4];
401 struct child_process proxy;
403 get_host_and_port(&host, &port);
405 argv[0] = git_proxy_command;
406 argv[1] = host;
407 argv[2] = port;
408 argv[3] = NULL;
409 memset(&proxy, 0, sizeof(proxy));
410 proxy.argv = argv;
411 proxy.in = -1;
412 proxy.out = -1;
413 if (start_command(&proxy))
414 die("cannot start proxy %s", argv[0]);
415 fd[0] = proxy.out; /* read from proxy stdout */
416 fd[1] = proxy.in; /* write to proxy stdin */
419 #define MAX_CMD_LEN 1024
421 static char *get_port(char *host)
423 char *end;
424 char *p = strchr(host, ':');
426 if (p) {
427 long port = strtol(p + 1, &end, 10);
428 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
429 *p = '\0';
430 return p+1;
434 return NULL;
437 static struct child_process no_fork;
440 * This returns a dummy child_process if the transport protocol does not
441 * need fork(2), or a struct child_process object if it does. Once done,
442 * finish the connection with finish_connect() with the value returned from
443 * this function (it is safe to call finish_connect() with NULL to support
444 * the former case).
446 * If it returns, the connect is successful; it just dies on errors (this
447 * will hopefully be changed in a libification effort, to return NULL when
448 * the connection failed).
450 struct child_process *git_connect(int fd[2], const char *url_orig,
451 const char *prog, int flags)
453 char *url = xstrdup(url_orig);
454 char *host, *path;
455 char *end;
456 int c;
457 struct child_process *conn;
458 enum protocol protocol = PROTO_LOCAL;
459 int free_path = 0;
460 char *port = NULL;
461 const char **arg;
462 struct strbuf cmd;
464 /* Without this we cannot rely on waitpid() to tell
465 * what happened to our children.
467 signal(SIGCHLD, SIG_DFL);
469 host = strstr(url, "://");
470 if (host) {
471 *host = '\0';
472 protocol = get_protocol(url);
473 host += 3;
474 c = '/';
475 } else {
476 host = url;
477 c = ':';
481 * Don't do destructive transforms with git:// as that
482 * protocol code does '[]' unwrapping of its own.
484 if (host[0] == '[') {
485 end = strchr(host + 1, ']');
486 if (end) {
487 if (protocol != PROTO_GIT) {
488 *end = 0;
489 host++;
491 end++;
492 } else
493 end = host;
494 } else
495 end = host;
497 path = strchr(end, c);
498 if (path && !has_dos_drive_prefix(end)) {
499 if (c == ':') {
500 protocol = PROTO_SSH;
501 *path++ = '\0';
503 } else
504 path = end;
506 if (!path || !*path)
507 die("No path specified. See 'man git-pull' for valid url syntax");
510 * null-terminate hostname and point path to ~ for URL's like this:
511 * ssh://host.xz/~user/repo
513 if (protocol != PROTO_LOCAL && host != url) {
514 char *ptr = path;
515 if (path[1] == '~')
516 path++;
517 else {
518 path = xstrdup(ptr);
519 free_path = 1;
522 *ptr = '\0';
526 * Add support for ssh port: ssh://host.xy:<port>/...
528 if (protocol == PROTO_SSH && host != url)
529 port = get_port(host);
531 if (protocol == PROTO_GIT) {
532 /* These underlying connection commands die() if they
533 * cannot connect.
535 char *target_host = xstrdup(host);
536 if (git_use_proxy(host))
537 git_proxy_connect(fd, host);
538 else
539 git_tcp_connect(fd, host, flags);
541 * Separate original protocol components prog and path
542 * from extended host header with a NUL byte.
544 * Note: Do not add any other headers here! Doing so
545 * will cause older git-daemon servers to crash.
547 packet_write(fd[1],
548 "%s %s%chost=%s%c",
549 prog, path, 0,
550 target_host, 0);
551 free(target_host);
552 free(url);
553 if (free_path)
554 free(path);
555 return &no_fork;
558 conn = xcalloc(1, sizeof(*conn));
560 strbuf_init(&cmd, MAX_CMD_LEN);
561 strbuf_addstr(&cmd, prog);
562 strbuf_addch(&cmd, ' ');
563 sq_quote_buf(&cmd, path);
564 if (cmd.len >= MAX_CMD_LEN)
565 die("command line too long");
567 conn->in = conn->out = -1;
568 conn->argv = arg = xcalloc(7, sizeof(*arg));
569 if (protocol == PROTO_SSH) {
570 const char *ssh = getenv("GIT_SSH");
571 int putty = ssh && strcasestr(ssh, "plink");
572 if (!ssh) ssh = "ssh";
574 *arg++ = ssh;
575 if (putty && !strcasestr(ssh, "tortoiseplink"))
576 *arg++ = "-batch";
577 if (port) {
578 /* P is for PuTTY, p is for OpenSSH */
579 *arg++ = putty ? "-P" : "-p";
580 *arg++ = port;
582 *arg++ = host;
584 else {
585 /* remove repo-local variables from the environment */
586 conn->env = local_repo_env;
587 conn->use_shell = 1;
589 *arg++ = cmd.buf;
590 *arg = NULL;
592 if (start_command(conn))
593 die("unable to fork");
595 fd[0] = conn->out; /* read from child's stdout */
596 fd[1] = conn->in; /* write to child's stdin */
597 strbuf_release(&cmd);
598 free(url);
599 if (free_path)
600 free(path);
601 return conn;
604 int finish_connect(struct child_process *conn)
606 int code;
607 if (!conn || conn == &no_fork)
608 return 0;
610 code = finish_command(conn);
611 free(conn->argv);
612 free(conn);
613 return code;
616 char *git_getpass(const char *prompt)
618 char *askpass;
619 struct child_process pass;
620 const char *args[3];
621 static struct strbuf buffer = STRBUF_INIT;
623 askpass = getenv("GIT_ASKPASS");
625 if (!askpass || !(*askpass))
626 return getpass(prompt);
628 args[0] = askpass;
629 args[1] = prompt;
630 args[2] = NULL;
632 memset(&pass, 0, sizeof(pass));
633 pass.argv = args;
634 pass.out = -1;
636 if (start_command(&pass))
637 exit(1);
639 strbuf_reset(&buffer);
640 if (strbuf_read(&buffer, pass.out, 20) < 0)
641 die("failed to read password from %s\n", askpass);
643 close(pass.out);
645 if (finish_command(&pass))
646 exit(1);
648 strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
650 return buffer.buf;