checkout: pass "struct checkout_opts *" as const pointer
[git/jnareb-git.git] / connect.c
blob55a85adea94c87c912280079ee13afd6926901aa
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++;
52 static void die_initial_contact(int got_at_least_one_head)
54 if (got_at_least_one_head)
55 die("The remote end hung up upon initial contact");
56 else
57 die("Could not read from remote repository.\n\n"
58 "Please make sure you have the correct access rights\n"
59 "and the repository exists.");
63 * Read all the refs from the other end
65 struct ref **get_remote_heads(int in, struct ref **list,
66 unsigned int flags,
67 struct extra_have_objects *extra_have)
69 int got_at_least_one_head = 0;
71 *list = NULL;
72 for (;;) {
73 struct ref *ref;
74 unsigned char old_sha1[20];
75 static char buffer[1000];
76 char *name;
77 int len, name_len;
79 len = packet_read(in, buffer, sizeof(buffer));
80 if (len < 0)
81 die_initial_contact(got_at_least_one_head);
83 if (!len)
84 break;
85 if (buffer[len-1] == '\n')
86 buffer[--len] = 0;
88 if (len > 4 && !prefixcmp(buffer, "ERR "))
89 die("remote error: %s", buffer + 4);
91 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
92 die("protocol error: expected sha/ref, got '%s'", buffer);
93 name = buffer + 41;
95 name_len = strlen(name);
96 if (len != name_len + 41) {
97 free(server_capabilities);
98 server_capabilities = xstrdup(name + name_len + 1);
101 if (extra_have &&
102 name_len == 5 && !memcmp(".have", name, 5)) {
103 add_extra_have(extra_have, old_sha1);
104 continue;
107 if (!check_ref(name, name_len, flags))
108 continue;
109 ref = alloc_ref(buffer + 41);
110 hashcpy(ref->old_sha1, old_sha1);
111 *list = ref;
112 list = &ref->next;
113 got_at_least_one_head = 1;
115 return list;
118 int server_supports(const char *feature)
120 return !!parse_feature_request(server_capabilities, feature);
123 const char *parse_feature_request(const char *feature_list, const char *feature)
125 int len;
127 if (!feature_list)
128 return NULL;
130 len = strlen(feature);
131 while (*feature_list) {
132 const char *found = strstr(feature_list, feature);
133 if (!found)
134 return NULL;
135 if ((feature_list == found || isspace(found[-1])) &&
136 (!found[len] || isspace(found[len]) || found[len] == '='))
137 return found;
138 feature_list = found + 1;
140 return NULL;
143 enum protocol {
144 PROTO_LOCAL = 1,
145 PROTO_SSH,
146 PROTO_GIT
149 static enum protocol get_protocol(const char *name)
151 if (!strcmp(name, "ssh"))
152 return PROTO_SSH;
153 if (!strcmp(name, "git"))
154 return PROTO_GIT;
155 if (!strcmp(name, "git+ssh"))
156 return PROTO_SSH;
157 if (!strcmp(name, "ssh+git"))
158 return PROTO_SSH;
159 if (!strcmp(name, "file"))
160 return PROTO_LOCAL;
161 die("I don't handle protocol '%s'", name);
164 #define STR_(s) # s
165 #define STR(s) STR_(s)
167 static void get_host_and_port(char **host, const char **port)
169 char *colon, *end;
171 if (*host[0] == '[') {
172 end = strchr(*host + 1, ']');
173 if (end) {
174 *end = 0;
175 end++;
176 (*host)++;
177 } else
178 end = *host;
179 } else
180 end = *host;
181 colon = strchr(end, ':');
183 if (colon) {
184 *colon = 0;
185 *port = colon + 1;
189 static void enable_keepalive(int sockfd)
191 int ka = 1;
193 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
194 fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
195 strerror(errno));
198 #ifndef NO_IPV6
200 static const char *ai_name(const struct addrinfo *ai)
202 static char addr[NI_MAXHOST];
203 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
204 NI_NUMERICHOST) != 0)
205 strcpy(addr, "(unknown)");
207 return addr;
211 * Returns a connected socket() fd, or else die()s.
213 static int git_tcp_connect_sock(char *host, int flags)
215 struct strbuf error_message = STRBUF_INIT;
216 int sockfd = -1;
217 const char *port = STR(DEFAULT_GIT_PORT);
218 struct addrinfo hints, *ai0, *ai;
219 int gai;
220 int cnt = 0;
222 get_host_and_port(&host, &port);
223 if (!*port)
224 port = "<none>";
226 memset(&hints, 0, sizeof(hints));
227 hints.ai_socktype = SOCK_STREAM;
228 hints.ai_protocol = IPPROTO_TCP;
230 if (flags & CONNECT_VERBOSE)
231 fprintf(stderr, "Looking up %s ... ", host);
233 gai = getaddrinfo(host, port, &hints, &ai);
234 if (gai)
235 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
237 if (flags & CONNECT_VERBOSE)
238 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
240 for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
241 sockfd = socket(ai->ai_family,
242 ai->ai_socktype, ai->ai_protocol);
243 if ((sockfd < 0) ||
244 (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
245 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
246 host, cnt, ai_name(ai), strerror(errno));
247 if (0 <= sockfd)
248 close(sockfd);
249 sockfd = -1;
250 continue;
252 if (flags & CONNECT_VERBOSE)
253 fprintf(stderr, "%s ", ai_name(ai));
254 break;
257 freeaddrinfo(ai0);
259 if (sockfd < 0)
260 die("unable to connect to %s:\n%s", host, error_message.buf);
262 enable_keepalive(sockfd);
264 if (flags & CONNECT_VERBOSE)
265 fprintf(stderr, "done.\n");
267 strbuf_release(&error_message);
269 return sockfd;
272 #else /* NO_IPV6 */
275 * Returns a connected socket() fd, or else die()s.
277 static int git_tcp_connect_sock(char *host, int flags)
279 struct strbuf error_message = STRBUF_INIT;
280 int sockfd = -1;
281 const char *port = STR(DEFAULT_GIT_PORT);
282 char *ep;
283 struct hostent *he;
284 struct sockaddr_in sa;
285 char **ap;
286 unsigned int nport;
287 int cnt;
289 get_host_and_port(&host, &port);
291 if (flags & CONNECT_VERBOSE)
292 fprintf(stderr, "Looking up %s ... ", host);
294 he = gethostbyname(host);
295 if (!he)
296 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
297 nport = strtoul(port, &ep, 10);
298 if ( ep == port || *ep ) {
299 /* Not numeric */
300 struct servent *se = getservbyname(port,"tcp");
301 if ( !se )
302 die("Unknown port %s", port);
303 nport = se->s_port;
306 if (flags & CONNECT_VERBOSE)
307 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
309 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
310 memset(&sa, 0, sizeof sa);
311 sa.sin_family = he->h_addrtype;
312 sa.sin_port = htons(nport);
313 memcpy(&sa.sin_addr, *ap, he->h_length);
315 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
316 if ((sockfd < 0) ||
317 connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
318 strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
319 host,
320 cnt,
321 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
322 strerror(errno));
323 if (0 <= sockfd)
324 close(sockfd);
325 sockfd = -1;
326 continue;
328 if (flags & CONNECT_VERBOSE)
329 fprintf(stderr, "%s ",
330 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
331 break;
334 if (sockfd < 0)
335 die("unable to connect to %s:\n%s", host, error_message.buf);
337 enable_keepalive(sockfd);
339 if (flags & CONNECT_VERBOSE)
340 fprintf(stderr, "done.\n");
342 return sockfd;
345 #endif /* NO_IPV6 */
348 static void git_tcp_connect(int fd[2], char *host, int flags)
350 int sockfd = git_tcp_connect_sock(host, flags);
352 fd[0] = sockfd;
353 fd[1] = dup(sockfd);
357 static char *git_proxy_command;
359 static int git_proxy_command_options(const char *var, const char *value,
360 void *cb)
362 if (!strcmp(var, "core.gitproxy")) {
363 const char *for_pos;
364 int matchlen = -1;
365 int hostlen;
366 const char *rhost_name = cb;
367 int rhost_len = strlen(rhost_name);
369 if (git_proxy_command)
370 return 0;
371 if (!value)
372 return config_error_nonbool(var);
373 /* [core]
374 * ;# matches www.kernel.org as well
375 * gitproxy = netcatter-1 for kernel.org
376 * gitproxy = netcatter-2 for sample.xz
377 * gitproxy = netcatter-default
379 for_pos = strstr(value, " for ");
380 if (!for_pos)
381 /* matches everybody */
382 matchlen = strlen(value);
383 else {
384 hostlen = strlen(for_pos + 5);
385 if (rhost_len < hostlen)
386 matchlen = -1;
387 else if (!strncmp(for_pos + 5,
388 rhost_name + rhost_len - hostlen,
389 hostlen) &&
390 ((rhost_len == hostlen) ||
391 rhost_name[rhost_len - hostlen -1] == '.'))
392 matchlen = for_pos - value;
393 else
394 matchlen = -1;
396 if (0 <= matchlen) {
397 /* core.gitproxy = none for kernel.org */
398 if (matchlen == 4 &&
399 !memcmp(value, "none", 4))
400 matchlen = 0;
401 git_proxy_command = xmemdupz(value, matchlen);
403 return 0;
406 return git_default_config(var, value, cb);
409 static int git_use_proxy(const char *host)
411 git_proxy_command = getenv("GIT_PROXY_COMMAND");
412 git_config(git_proxy_command_options, (void*)host);
413 return (git_proxy_command && *git_proxy_command);
416 static struct child_process *git_proxy_connect(int fd[2], char *host)
418 const char *port = STR(DEFAULT_GIT_PORT);
419 const char **argv;
420 struct child_process *proxy;
422 get_host_and_port(&host, &port);
424 argv = xmalloc(sizeof(*argv) * 4);
425 argv[0] = git_proxy_command;
426 argv[1] = host;
427 argv[2] = port;
428 argv[3] = NULL;
429 proxy = xcalloc(1, sizeof(*proxy));
430 proxy->argv = argv;
431 proxy->in = -1;
432 proxy->out = -1;
433 if (start_command(proxy))
434 die("cannot start proxy %s", argv[0]);
435 fd[0] = proxy->out; /* read from proxy stdout */
436 fd[1] = proxy->in; /* write to proxy stdin */
437 return proxy;
440 #define MAX_CMD_LEN 1024
442 static char *get_port(char *host)
444 char *end;
445 char *p = strchr(host, ':');
447 if (p) {
448 long port = strtol(p + 1, &end, 10);
449 if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
450 *p = '\0';
451 return p+1;
455 return NULL;
458 static struct child_process no_fork;
461 * This returns a dummy child_process if the transport protocol does not
462 * need fork(2), or a struct child_process object if it does. Once done,
463 * finish the connection with finish_connect() with the value returned from
464 * this function (it is safe to call finish_connect() with NULL to support
465 * the former case).
467 * If it returns, the connect is successful; it just dies on errors (this
468 * will hopefully be changed in a libification effort, to return NULL when
469 * the connection failed).
471 struct child_process *git_connect(int fd[2], const char *url_orig,
472 const char *prog, int flags)
474 char *url;
475 char *host, *path;
476 char *end;
477 int c;
478 struct child_process *conn = &no_fork;
479 enum protocol protocol = PROTO_LOCAL;
480 int free_path = 0;
481 char *port = NULL;
482 const char **arg;
483 struct strbuf cmd;
485 /* Without this we cannot rely on waitpid() to tell
486 * what happened to our children.
488 signal(SIGCHLD, SIG_DFL);
490 if (is_url(url_orig))
491 url = url_decode(url_orig);
492 else
493 url = xstrdup(url_orig);
495 host = strstr(url, "://");
496 if (host) {
497 *host = '\0';
498 protocol = get_protocol(url);
499 host += 3;
500 c = '/';
501 } else {
502 host = url;
503 c = ':';
507 * Don't do destructive transforms with git:// as that
508 * protocol code does '[]' unwrapping of its own.
510 if (host[0] == '[') {
511 end = strchr(host + 1, ']');
512 if (end) {
513 if (protocol != PROTO_GIT) {
514 *end = 0;
515 host++;
517 end++;
518 } else
519 end = host;
520 } else
521 end = host;
523 path = strchr(end, c);
524 if (path && !has_dos_drive_prefix(end)) {
525 if (c == ':') {
526 protocol = PROTO_SSH;
527 *path++ = '\0';
529 } else
530 path = end;
532 if (!path || !*path)
533 die("No path specified. See 'man git-pull' for valid url syntax");
536 * null-terminate hostname and point path to ~ for URL's like this:
537 * ssh://host.xz/~user/repo
539 if (protocol != PROTO_LOCAL && host != url) {
540 char *ptr = path;
541 if (path[1] == '~')
542 path++;
543 else {
544 path = xstrdup(ptr);
545 free_path = 1;
548 *ptr = '\0';
552 * Add support for ssh port: ssh://host.xy:<port>/...
554 if (protocol == PROTO_SSH && host != url)
555 port = get_port(end);
557 if (protocol == PROTO_GIT) {
558 /* These underlying connection commands die() if they
559 * cannot connect.
561 char *target_host = xstrdup(host);
562 if (git_use_proxy(host))
563 conn = git_proxy_connect(fd, host);
564 else
565 git_tcp_connect(fd, host, flags);
567 * Separate original protocol components prog and path
568 * from extended host header with a NUL byte.
570 * Note: Do not add any other headers here! Doing so
571 * will cause older git-daemon servers to crash.
573 packet_write(fd[1],
574 "%s %s%chost=%s%c",
575 prog, path, 0,
576 target_host, 0);
577 free(target_host);
578 free(url);
579 if (free_path)
580 free(path);
581 return conn;
584 conn = xcalloc(1, sizeof(*conn));
586 strbuf_init(&cmd, MAX_CMD_LEN);
587 strbuf_addstr(&cmd, prog);
588 strbuf_addch(&cmd, ' ');
589 sq_quote_buf(&cmd, path);
590 if (cmd.len >= MAX_CMD_LEN)
591 die("command line too long");
593 conn->in = conn->out = -1;
594 conn->argv = arg = xcalloc(7, sizeof(*arg));
595 if (protocol == PROTO_SSH) {
596 const char *ssh = getenv("GIT_SSH");
597 int putty = ssh && strcasestr(ssh, "plink");
598 if (!ssh) ssh = "ssh";
600 *arg++ = ssh;
601 if (putty && !strcasestr(ssh, "tortoiseplink"))
602 *arg++ = "-batch";
603 if (port) {
604 /* P is for PuTTY, p is for OpenSSH */
605 *arg++ = putty ? "-P" : "-p";
606 *arg++ = port;
608 *arg++ = host;
610 else {
611 /* remove repo-local variables from the environment */
612 conn->env = local_repo_env;
613 conn->use_shell = 1;
615 *arg++ = cmd.buf;
616 *arg = NULL;
618 if (start_command(conn))
619 die("unable to fork");
621 fd[0] = conn->out; /* read from child's stdout */
622 fd[1] = conn->in; /* write to child's stdin */
623 strbuf_release(&cmd);
624 free(url);
625 if (free_path)
626 free(path);
627 return conn;
630 int git_connection_is_socket(struct child_process *conn)
632 return conn == &no_fork;
635 int finish_connect(struct child_process *conn)
637 int code;
638 if (!conn || git_connection_is_socket(conn))
639 return 0;
641 code = finish_command(conn);
642 free(conn->argv);
643 free(conn);
644 return code;