submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / connect.c
blob51990fa0cb300a95b125b0727f10133961d0167b
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_refname_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 struct strbuf error_message = STRBUF_INIT;
196 int sockfd = -1;
197 const char *port = STR(DEFAULT_GIT_PORT);
198 struct addrinfo hints, *ai0, *ai;
199 int gai;
200 int cnt = 0;
202 get_host_and_port(&host, &port);
203 if (!*port)
204 port = "<none>";
206 memset(&hints, 0, sizeof(hints));
207 hints.ai_socktype = SOCK_STREAM;
208 hints.ai_protocol = IPPROTO_TCP;
210 if (flags & CONNECT_VERBOSE)
211 fprintf(stderr, "Looking up %s ... ", host);
213 gai = getaddrinfo(host, port, &hints, &ai);
214 if (gai)
215 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
217 if (flags & CONNECT_VERBOSE)
218 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
220 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
221 sockfd = socket(ai->ai_family,
222 ai->ai_socktype, ai->ai_protocol);
223 if ((sockfd < 0) ||
224 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
225 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
226 host, cnt, ai_name(ai), strerror(errno));
227 if (0 <= sockfd)
228 close(sockfd);
229 sockfd = -1;
230 continue;
232 if (flags & CONNECT_VERBOSE)
233 fprintf(stderr, "%s ", ai_name(ai));
234 break;
237 freeaddrinfo(ai0);
239 if (sockfd < 0)
240 die("unable to connect to %s:\n%s", host, error_message.buf);
242 if (flags & CONNECT_VERBOSE)
243 fprintf(stderr, "done.\n");
245 strbuf_release(&error_message);
247 return sockfd;
250 #else /* NO_IPV6 */
253 * Returns a connected socket() fd, or else die()s.
255 static int git_tcp_connect_sock(char *host, int flags)
257 struct strbuf error_message = STRBUF_INIT;
258 int sockfd = -1;
259 const char *port = STR(DEFAULT_GIT_PORT);
260 char *ep;
261 struct hostent *he;
262 struct sockaddr_in sa;
263 char **ap;
264 unsigned int nport;
265 int cnt;
267 get_host_and_port(&host, &port);
269 if (flags & CONNECT_VERBOSE)
270 fprintf(stderr, "Looking up %s ... ", host);
272 he = gethostbyname(host);
273 if (!he)
274 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
275 nport = strtoul(port, &ep, 10);
276 if ( ep == port || *ep ) {
277 /* Not numeric */
278 struct servent *se = getservbyname(port,"tcp");
279 if ( !se )
280 die("Unknown port %s", port);
281 nport = se->s_port;
284 if (flags & CONNECT_VERBOSE)
285 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
287 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
288 memset(&sa, 0, sizeof sa);
289 sa.sin_family = he->h_addrtype;
290 sa.sin_port = htons(nport);
291 memcpy(&sa.sin_addr, *ap, he->h_length);
293 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
294 if ((sockfd < 0) ||
295 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
296 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
297 host,
298 cnt,
299 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
300 strerror(errno));
301 if (0 <= sockfd)
302 close(sockfd);
303 sockfd = -1;
304 continue;
306 if (flags & CONNECT_VERBOSE)
307 fprintf(stderr, "%s ",
308 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
309 break;
312 if (sockfd < 0)
313 die("unable to connect to %s:\n%s", host, error_message.buf);
315 if (flags & CONNECT_VERBOSE)
316 fprintf(stderr, "done.\n");
318 return sockfd;
321 #endif /* NO_IPV6 */
324 static void git_tcp_connect(int fd[2], char *host, int flags)
326 int sockfd = git_tcp_connect_sock(host, flags);
328 fd[0] = sockfd;
329 fd[1] = dup(sockfd);
333 static char *git_proxy_command;
335 static int git_proxy_command_options(const char *var, const char *value,
336 void *cb)
338 if (!strcmp(var, "core.gitproxy")) {
339 const char *for_pos;
340 int matchlen = -1;
341 int hostlen;
342 const char *rhost_name = cb;
343 int rhost_len = strlen(rhost_name);
345 if (git_proxy_command)
346 return 0;
347 if (!value)
348 return config_error_nonbool(var);
349 /* [core]
350 * ;# matches www.kernel.org as well
351 * gitproxy = netcatter-1 for kernel.org
352 * gitproxy = netcatter-2 for sample.xz
353 * gitproxy = netcatter-default
355 for_pos = strstr(value, " for ");
356 if (!for_pos)
357 /* matches everybody */
358 matchlen = strlen(value);
359 else {
360 hostlen = strlen(for_pos + 5);
361 if (rhost_len < hostlen)
362 matchlen = -1;
363 else if (!strncmp(for_pos + 5,
364 rhost_name + rhost_len - hostlen,
365 hostlen) &&
366 ((rhost_len == hostlen) ||
367 rhost_name[rhost_len - hostlen -1] == '.'))
368 matchlen = for_pos - value;
369 else
370 matchlen = -1;
372 if (0 <= matchlen) {
373 /* core.gitproxy = none for kernel.org */
374 if (matchlen == 4 &&
375 !memcmp(value, "none", 4))
376 matchlen = 0;
377 git_proxy_command = xmemdupz(value, matchlen);
379 return 0;
382 return git_default_config(var, value, cb);
385 static int git_use_proxy(const char *host)
387 git_proxy_command = getenv("GIT_PROXY_COMMAND");
388 git_config(git_proxy_command_options, (void*)host);
389 return (git_proxy_command && *git_proxy_command);
392 static struct child_process *git_proxy_connect(int fd[2], char *host)
394 const char *port = STR(DEFAULT_GIT_PORT);
395 const char **argv;
396 struct child_process *proxy;
398 get_host_and_port(&host, &port);
400 argv = xmalloc(sizeof(*argv) * 4);
401 argv[0] = git_proxy_command;
402 argv[1] = host;
403 argv[2] = port;
404 argv[3] = NULL;
405 proxy = xcalloc(1, sizeof(*proxy));
406 proxy->argv = argv;
407 proxy->in = -1;
408 proxy->out = -1;
409 if (start_command(proxy))
410 die("cannot start proxy %s", argv[0]);
411 fd[0] = proxy->out; /* read from proxy stdout */
412 fd[1] = proxy->in; /* write to proxy stdin */
413 return proxy;
416 #define MAX_CMD_LEN 1024
418 static char *get_port(char *host)
420 char *end;
421 char *p = strchr(host, ':');
423 if (p) {
424 long port = strtol(p + 1, &end, 10);
425 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
426 *p = '\0';
427 return p+1;
431 return NULL;
434 static struct child_process no_fork;
437 * This returns a dummy child_process if the transport protocol does not
438 * need fork(2), or a struct child_process object if it does. Once done,
439 * finish the connection with finish_connect() with the value returned from
440 * this function (it is safe to call finish_connect() with NULL to support
441 * the former case).
443 * If it returns, the connect is successful; it just dies on errors (this
444 * will hopefully be changed in a libification effort, to return NULL when
445 * the connection failed).
447 struct child_process *git_connect(int fd[2], const char *url_orig,
448 const char *prog, int flags)
450 char *url;
451 char *host, *path;
452 char *end;
453 int c;
454 struct child_process *conn = &no_fork;
455 enum protocol protocol = PROTO_LOCAL;
456 int free_path = 0;
457 char *port = NULL;
458 const char **arg;
459 struct strbuf cmd;
461 /* Without this we cannot rely on waitpid() to tell
462 * what happened to our children.
464 signal(SIGCHLD, SIG_DFL);
466 if (is_url(url_orig))
467 url = url_decode(url_orig);
468 else
469 url = xstrdup(url_orig);
471 host = strstr(url, "://");
472 if (host) {
473 *host = '\0';
474 protocol = get_protocol(url);
475 host += 3;
476 c = '/';
477 } else {
478 host = url;
479 c = ':';
483 * Don't do destructive transforms with git:// as that
484 * protocol code does '[]' unwrapping of its own.
486 if (host[0] == '[') {
487 end = strchr(host + 1, ']');
488 if (end) {
489 if (protocol != PROTO_GIT) {
490 *end = 0;
491 host++;
493 end++;
494 } else
495 end = host;
496 } else
497 end = host;
499 path = strchr(end, c);
500 if (path && !has_dos_drive_prefix(end)) {
501 if (c == ':') {
502 protocol = PROTO_SSH;
503 *path++ = '\0';
505 } else
506 path = end;
508 if (!path || !*path)
509 die("No path specified. See 'man git-pull' for valid url syntax");
512 * null-terminate hostname and point path to ~ for URL's like this:
513 * ssh://host.xz/~user/repo
515 if (protocol != PROTO_LOCAL && host != url) {
516 char *ptr = path;
517 if (path[1] == '~')
518 path++;
519 else {
520 path = xstrdup(ptr);
521 free_path = 1;
524 *ptr = '\0';
528 * Add support for ssh port: ssh://host.xy:<port>/...
530 if (protocol == PROTO_SSH && host != url)
531 port = get_port(host);
533 if (protocol == PROTO_GIT) {
534 /* These underlying connection commands die() if they
535 * cannot connect.
537 char *target_host = xstrdup(host);
538 if (git_use_proxy(host))
539 conn = git_proxy_connect(fd, host);
540 else
541 git_tcp_connect(fd, host, flags);
543 * Separate original protocol components prog and path
544 * from extended host header with a NUL byte.
546 * Note: Do not add any other headers here! Doing so
547 * will cause older git-daemon servers to crash.
549 packet_write(fd[1],
550 "%s %s%chost=%s%c",
551 prog, path, 0,
552 target_host, 0);
553 free(target_host);
554 free(url);
555 if (free_path)
556 free(path);
557 return conn;
560 conn = xcalloc(1, sizeof(*conn));
562 strbuf_init(&cmd, MAX_CMD_LEN);
563 strbuf_addstr(&cmd, prog);
564 strbuf_addch(&cmd, ' ');
565 sq_quote_buf(&cmd, path);
566 if (cmd.len >= MAX_CMD_LEN)
567 die("command line too long");
569 conn->in = conn->out = -1;
570 conn->argv = arg = xcalloc(7, sizeof(*arg));
571 if (protocol == PROTO_SSH) {
572 const char *ssh = getenv("GIT_SSH");
573 int putty = ssh && strcasestr(ssh, "plink");
574 if (!ssh) ssh = "ssh";
576 *arg++ = ssh;
577 if (putty && !strcasestr(ssh, "tortoiseplink"))
578 *arg++ = "-batch";
579 if (port) {
580 /* P is for PuTTY, p is for OpenSSH */
581 *arg++ = putty ? "-P" : "-p";
582 *arg++ = port;
584 *arg++ = host;
586 else {
587 /* remove repo-local variables from the environment */
588 conn->env = local_repo_env;
589 conn->use_shell = 1;
591 *arg++ = cmd.buf;
592 *arg = NULL;
594 if (start_command(conn))
595 die("unable to fork");
597 fd[0] = conn->out; /* read from child's stdout */
598 fd[1] = conn->in; /* write to child's stdin */
599 strbuf_release(&cmd);
600 free(url);
601 if (free_path)
602 free(path);
603 return conn;
606 int git_connection_is_socket(struct child_process *conn)
608 return conn == &no_fork;
611 int finish_connect(struct child_process *conn)
613 int code;
614 if (!conn || git_connection_is_socket(conn))
615 return 0;
617 code = finish_command(conn);
618 free(conn->argv);
619 free(conn);
620 return code;
623 char *git_getpass(const char *prompt)
625 const char *askpass;
626 struct child_process pass;
627 const char *args[3];
628 static struct strbuf buffer = STRBUF_INIT;
630 askpass = getenv("GIT_ASKPASS");
631 if (!askpass)
632 askpass = askpass_program;
633 if (!askpass)
634 askpass = getenv("SSH_ASKPASS");
635 if (!askpass || !(*askpass)) {
636 char *result = getpass(prompt);
637 if (!result)
638 die_errno("Could not read password");
639 return result;
642 args[0] = askpass;
643 args[1] = prompt;
644 args[2] = NULL;
646 memset(&pass, 0, sizeof(pass));
647 pass.argv = args;
648 pass.out = -1;
650 if (start_command(&pass))
651 exit(1);
653 strbuf_reset(&buffer);
654 if (strbuf_read(&buffer, pass.out, 20) < 0)
655 die("failed to read password from %s\n", askpass);
657 close(pass.out);
659 if (finish_command(&pass))
660 exit(1);
662 strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
664 return buffer.buf;