MSVC: fix poll-related macro redefines
[git/dscho.git] / connect.c
blob912cddeea8c4f09ec523ce19e677358c84eda9b7
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 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 ref = alloc_ref(buffer + 41);
95 hashcpy(ref->old_sha1, old_sha1);
96 *list = ref;
97 list = &ref->next;
99 return list;
102 int server_supports(const char *feature)
104 return !!parse_feature_request(server_capabilities, feature);
107 const char *parse_feature_request(const char *feature_list, const char *feature)
109 int len;
111 if (!feature_list)
112 return NULL;
114 len = strlen(feature);
115 while (*feature_list) {
116 const char *found = strstr(feature_list, feature);
117 if (!found)
118 return NULL;
119 if ((feature_list == found || isspace(found[-1])) &&
120 (!found[len] || isspace(found[len]) || found[len] == '='))
121 return found;
122 feature_list = found + 1;
124 return NULL;
127 enum protocol {
128 PROTO_LOCAL = 1,
129 PROTO_SSH,
130 PROTO_GIT
133 static enum protocol get_protocol(const char *name)
135 if (!strcmp(name, "ssh"))
136 return PROTO_SSH;
137 if (!strcmp(name, "git"))
138 return PROTO_GIT;
139 if (!strcmp(name, "git+ssh"))
140 return PROTO_SSH;
141 if (!strcmp(name, "ssh+git"))
142 return PROTO_SSH;
143 if (!strcmp(name, "file"))
144 return PROTO_LOCAL;
145 die("I don't handle protocol '%s'", name);
148 #define STR_(s) # s
149 #define STR(s) STR_(s)
151 static void get_host_and_port(char **host, const char **port)
153 char *colon, *end;
155 if (*host[0] == '[') {
156 end = strchr(*host + 1, ']');
157 if (end) {
158 *end = 0;
159 end++;
160 (*host)++;
161 } else
162 end = *host;
163 } else
164 end = *host;
165 colon = strchr(end, ':');
167 if (colon) {
168 *colon = 0;
169 *port = colon + 1;
173 static void enable_keepalive(int sockfd)
175 int ka = 1;
177 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
178 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
179 strerror(errno));
182 #ifndef NO_IPV6
184 static const char *ai_name(const struct addrinfo *ai)
186 static char addr[NI_MAXHOST];
187 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
188 NI_NUMERICHOST) != 0)
189 strcpy(addr, "(unknown)");
191 return addr;
195 * Returns a connected socket() fd, or else die()s.
197 static int git_tcp_connect_sock(char *host, int flags)
199 struct strbuf error_message = STRBUF_INIT;
200 int sockfd = -1;
201 const char *port = STR(DEFAULT_GIT_PORT);
202 struct addrinfo hints, *ai0, *ai;
203 int gai;
204 int cnt = 0;
206 get_host_and_port(&host, &port);
207 if (!*port)
208 port = "<none>";
210 memset(&hints, 0, sizeof(hints));
211 hints.ai_socktype = SOCK_STREAM;
212 hints.ai_protocol = IPPROTO_TCP;
214 if (flags & CONNECT_VERBOSE)
215 fprintf(stderr, "Looking up %s ... ", host);
217 gai = getaddrinfo(host, port, &hints, &ai);
218 if (gai)
219 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
221 if (flags & CONNECT_VERBOSE)
222 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
224 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
225 sockfd = socket(ai->ai_family,
226 ai->ai_socktype, ai->ai_protocol);
227 if ((sockfd < 0) ||
228 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
229 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
230 host, cnt, ai_name(ai), strerror(errno));
231 if (0 <= sockfd)
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 to %s:\n%s", host, error_message.buf);
246 enable_keepalive(sockfd);
248 if (flags & CONNECT_VERBOSE)
249 fprintf(stderr, "done.\n");
251 strbuf_release(&error_message);
253 return sockfd;
256 #else /* NO_IPV6 */
259 * Returns a connected socket() fd, or else die()s.
261 static int git_tcp_connect_sock(char *host, int flags)
263 struct strbuf error_message = STRBUF_INIT;
264 int sockfd = -1;
265 const char *port = STR(DEFAULT_GIT_PORT);
266 char *ep;
267 struct hostent *he;
268 struct sockaddr_in sa;
269 char **ap;
270 unsigned int nport;
271 int cnt;
273 get_host_and_port(&host, &port);
275 if (flags & CONNECT_VERBOSE)
276 fprintf(stderr, "Looking up %s ... ", host);
278 he = gethostbyname(host);
279 if (!he)
280 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
281 nport = strtoul(port, &ep, 10);
282 if ( ep == port || *ep ) {
283 /* Not numeric */
284 struct servent *se = getservbyname(port,"tcp");
285 if ( !se )
286 die("Unknown port %s", port);
287 nport = se->s_port;
290 if (flags & CONNECT_VERBOSE)
291 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
293 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
294 memset(&sa, 0, sizeof sa);
295 sa.sin_family = he->h_addrtype;
296 sa.sin_port = htons(nport);
297 memcpy(&sa.sin_addr, *ap, he->h_length);
299 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
300 if ((sockfd < 0) ||
301 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
302 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
303 host,
304 cnt,
305 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
306 strerror(errno));
307 if (0 <= sockfd)
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 to %s:\n%s", host, error_message.buf);
321 enable_keepalive(sockfd);
323 if (flags & CONNECT_VERBOSE)
324 fprintf(stderr, "done.\n");
326 return sockfd;
329 #endif /* NO_IPV6 */
332 static void git_tcp_connect(int fd[2], char *host, int flags)
334 int sockfd = git_tcp_connect_sock(host, flags);
336 fd[0] = sockfd;
337 fd[1] = dup(sockfd);
341 static char *git_proxy_command;
343 static int git_proxy_command_options(const char *var, const char *value,
344 void *cb)
346 if (!strcmp(var, "core.gitproxy")) {
347 const char *for_pos;
348 int matchlen = -1;
349 int hostlen;
350 const char *rhost_name = cb;
351 int rhost_len = strlen(rhost_name);
353 if (git_proxy_command)
354 return 0;
355 if (!value)
356 return config_error_nonbool(var);
357 /* [core]
358 * ;# matches www.kernel.org as well
359 * gitproxy = netcatter-1 for kernel.org
360 * gitproxy = netcatter-2 for sample.xz
361 * gitproxy = netcatter-default
363 for_pos = strstr(value, " for ");
364 if (!for_pos)
365 /* matches everybody */
366 matchlen = strlen(value);
367 else {
368 hostlen = strlen(for_pos + 5);
369 if (rhost_len < hostlen)
370 matchlen = -1;
371 else if (!strncmp(for_pos + 5,
372 rhost_name + rhost_len - hostlen,
373 hostlen) &&
374 ((rhost_len == hostlen) ||
375 rhost_name[rhost_len - hostlen -1] == '.'))
376 matchlen = for_pos - value;
377 else
378 matchlen = -1;
380 if (0 <= matchlen) {
381 /* core.gitproxy = none for kernel.org */
382 if (matchlen == 4 &&
383 !memcmp(value, "none", 4))
384 matchlen = 0;
385 git_proxy_command = xmemdupz(value, matchlen);
387 return 0;
390 return git_default_config(var, value, cb);
393 static int git_use_proxy(const char *host)
395 git_proxy_command = getenv("GIT_PROXY_COMMAND");
396 git_config(git_proxy_command_options, (void*)host);
397 return (git_proxy_command && *git_proxy_command);
400 static struct child_process *git_proxy_connect(int fd[2], char *host)
402 const char *port = STR(DEFAULT_GIT_PORT);
403 const char **argv;
404 struct child_process *proxy;
406 get_host_and_port(&host, &port);
408 argv = xmalloc(sizeof(*argv) * 4);
409 argv[0] = git_proxy_command;
410 argv[1] = host;
411 argv[2] = port;
412 argv[3] = NULL;
413 proxy = xcalloc(1, sizeof(*proxy));
414 proxy->argv = argv;
415 proxy->in = -1;
416 proxy->out = -1;
417 if (start_command(proxy))
418 die("cannot start proxy %s", argv[0]);
419 fd[0] = proxy->out; /* read from proxy stdout */
420 fd[1] = proxy->in; /* write to proxy stdin */
421 return proxy;
424 #define MAX_CMD_LEN 1024
426 static char *get_port(char *host)
428 char *end;
429 char *p = strchr(host, ':');
431 if (p) {
432 long port = strtol(p + 1, &end, 10);
433 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
434 *p = '\0';
435 return p+1;
439 return NULL;
442 static struct child_process no_fork;
445 * This returns a dummy child_process if the transport protocol does not
446 * need fork(2), or a struct child_process object if it does. Once done,
447 * finish the connection with finish_connect() with the value returned from
448 * this function (it is safe to call finish_connect() with NULL to support
449 * the former case).
451 * If it returns, the connect is successful; it just dies on errors (this
452 * will hopefully be changed in a libification effort, to return NULL when
453 * the connection failed).
455 struct child_process *git_connect(int fd[2], const char *url_orig,
456 const char *prog, int flags)
458 char *url;
459 char *host, *path;
460 char *end;
461 int c;
462 struct child_process *conn = &no_fork;
463 enum protocol protocol = PROTO_LOCAL;
464 int free_path = 0;
465 char *port = NULL;
466 const char **arg;
467 struct strbuf cmd;
469 /* Without this we cannot rely on waitpid() to tell
470 * what happened to our children.
472 signal(SIGCHLD, SIG_DFL);
474 if (is_url(url_orig))
475 url = url_decode(url_orig);
476 else
477 url = xstrdup(url_orig);
479 host = strstr(url, "://");
480 if (host) {
481 *host = '\0';
482 protocol = get_protocol(url);
483 host += 3;
484 c = '/';
485 } else {
486 host = url;
487 c = ':';
491 * Don't do destructive transforms with git:// as that
492 * protocol code does '[]' unwrapping of its own.
494 if (host[0] == '[') {
495 end = strchr(host + 1, ']');
496 if (end) {
497 if (protocol != PROTO_GIT) {
498 *end = 0;
499 host++;
501 end++;
502 } else
503 end = host;
504 } else
505 end = host;
507 path = strchr(end, c);
508 if (path && !has_dos_drive_prefix(end)) {
509 if (c == ':') {
510 protocol = PROTO_SSH;
511 *path++ = '\0';
513 } else
514 path = end;
516 if (!path || !*path)
517 die("No path specified. See 'man git-pull' for valid url syntax");
520 * null-terminate hostname and point path to ~ for URL's like this:
521 * ssh://host.xz/~user/repo
523 if (protocol != PROTO_LOCAL && host != url) {
524 char *ptr = path;
525 if (path[1] == '~')
526 path++;
527 else {
528 path = xstrdup(ptr);
529 free_path = 1;
532 *ptr = '\0';
536 * Add support for ssh port: ssh://host.xy:<port>/...
538 if (protocol == PROTO_SSH && host != url)
539 port = get_port(host);
541 if (protocol == PROTO_GIT) {
542 /* These underlying connection commands die() if they
543 * cannot connect.
545 char *target_host = xstrdup(host);
546 if (git_use_proxy(host))
547 conn = git_proxy_connect(fd, host);
548 else
549 git_tcp_connect(fd, host, flags);
551 * Separate original protocol components prog and path
552 * from extended host header with a NUL byte.
554 * Note: Do not add any other headers here! Doing so
555 * will cause older git-daemon servers to crash.
557 packet_write(fd[1],
558 "%s %s%chost=%s%c",
559 prog, path, 0,
560 target_host, 0);
561 free(target_host);
562 free(url);
563 if (free_path)
564 free(path);
565 return conn;
568 conn = xcalloc(1, sizeof(*conn));
570 strbuf_init(&cmd, MAX_CMD_LEN);
571 strbuf_addstr(&cmd, prog);
572 strbuf_addch(&cmd, ' ');
573 sq_quote_buf(&cmd, path);
574 if (cmd.len >= MAX_CMD_LEN)
575 die("command line too long");
577 conn->in = conn->out = -1;
578 conn->argv = arg = xcalloc(7, sizeof(*arg));
579 if (protocol == PROTO_SSH) {
580 const char *ssh = getenv("GIT_SSH");
581 int putty = ssh && strcasestr(ssh, "plink");
582 if (!ssh) ssh = "ssh";
584 *arg++ = ssh;
585 if (putty && !strcasestr(ssh, "tortoiseplink"))
586 *arg++ = "-batch";
587 if (port) {
588 /* P is for PuTTY, p is for OpenSSH */
589 *arg++ = putty ? "-P" : "-p";
590 *arg++ = port;
592 *arg++ = host;
594 else {
595 /* remove repo-local variables from the environment */
596 conn->env = local_repo_env;
597 conn->use_shell = 1;
599 *arg++ = cmd.buf;
600 *arg = NULL;
602 if (start_command(conn))
603 die("unable to fork");
605 fd[0] = conn->out; /* read from child's stdout */
606 fd[1] = conn->in; /* write to child's stdin */
607 strbuf_release(&cmd);
608 free(url);
609 if (free_path)
610 free(path);
611 return conn;
614 int git_connection_is_socket(struct child_process *conn)
616 return conn == &no_fork;
619 int finish_connect(struct child_process *conn)
621 int code;
622 if (!conn || git_connection_is_socket(conn))
623 return 0;
625 code = finish_command(conn);
626 free(conn->argv);
627 free(conn);
628 return code;