gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / connect.c
blob574f42fa47ffa69328217eb25afee6f85db9595e
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);
45 * Read all the refs from the other end
47 struct ref **get_remote_heads(int in, struct ref **list,
48 int nr_match, char **match,
49 unsigned int flags)
51 *list = NULL;
52 for (;;) {
53 struct ref *ref;
54 unsigned char old_sha1[20];
55 static char buffer[1000];
56 char *name;
57 int len, name_len;
59 len = packet_read_line(in, buffer, sizeof(buffer));
60 if (!len)
61 break;
62 if (buffer[len-1] == '\n')
63 buffer[--len] = 0;
65 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
66 die("protocol error: expected sha/ref, got '%s'", buffer);
67 name = buffer + 41;
69 name_len = strlen(name);
70 if (len != name_len + 41) {
71 free(server_capabilities);
72 server_capabilities = xstrdup(name + name_len + 1);
75 if (!check_ref(name, name_len, flags))
76 continue;
77 if (nr_match && !path_match(name, nr_match, match))
78 continue;
79 ref = alloc_ref(name_len + 1);
80 hashcpy(ref->old_sha1, old_sha1);
81 memcpy(ref->name, buffer + 41, name_len + 1);
82 *list = ref;
83 list = &ref->next;
85 return list;
88 int server_supports(const char *feature)
90 return server_capabilities &&
91 strstr(server_capabilities, feature) != NULL;
94 int get_ack(int fd, unsigned char *result_sha1)
96 static char line[1000];
97 int len = packet_read_line(fd, line, sizeof(line));
99 if (!len)
100 die("git-fetch-pack: expected ACK/NAK, got EOF");
101 if (line[len-1] == '\n')
102 line[--len] = 0;
103 if (!strcmp(line, "NAK"))
104 return 0;
105 if (!prefixcmp(line, "ACK ")) {
106 if (!get_sha1_hex(line+4, result_sha1)) {
107 if (strstr(line+45, "continue"))
108 return 2;
109 return 1;
112 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
115 int path_match(const char *path, int nr, char **match)
117 int i;
118 int pathlen = strlen(path);
120 for (i = 0; i < nr; i++) {
121 char *s = match[i];
122 int len = strlen(s);
124 if (!len || len > pathlen)
125 continue;
126 if (memcmp(path + pathlen - len, s, len))
127 continue;
128 if (pathlen > len && path[pathlen - len - 1] != '/')
129 continue;
130 *s = 0;
131 return (i + 1);
133 return 0;
136 enum protocol {
137 PROTO_LOCAL = 1,
138 PROTO_SSH,
139 PROTO_GIT,
142 static enum protocol get_protocol(const char *name)
144 if (!strcmp(name, "ssh"))
145 return PROTO_SSH;
146 if (!strcmp(name, "git"))
147 return PROTO_GIT;
148 if (!strcmp(name, "git+ssh"))
149 return PROTO_SSH;
150 if (!strcmp(name, "ssh+git"))
151 return PROTO_SSH;
152 if (!strcmp(name, "file"))
153 return PROTO_LOCAL;
154 die("I don't handle protocol '%s'", name);
157 #define STR_(s) # s
158 #define STR(s) STR_(s)
160 #ifndef NO_IPV6
162 static const char *ai_name(const struct addrinfo *ai)
164 static char addr[INET_ADDRSTRLEN];
165 if ( AF_INET == ai->ai_family ) {
166 struct sockaddr_in *in;
167 in = (struct sockaddr_in *)ai->ai_addr;
168 inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
169 } else if ( AF_INET6 == ai->ai_family ) {
170 struct sockaddr_in6 *in;
171 in = (struct sockaddr_in6 *)ai->ai_addr;
172 inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
173 } else {
174 strcpy(addr, "(unknown)");
176 return addr;
180 * Returns a connected socket() fd, or else die()s.
182 static int git_tcp_connect_sock(char *host, int flags)
184 int sockfd = -1, saved_errno = 0;
185 char *colon, *end;
186 const char *port = STR(DEFAULT_GIT_PORT);
187 struct addrinfo hints, *ai0, *ai;
188 int gai;
189 int cnt = 0;
191 if (host[0] == '[') {
192 end = strchr(host + 1, ']');
193 if (end) {
194 *end = 0;
195 end++;
196 host++;
197 } else
198 end = host;
199 } else
200 end = host;
201 colon = strchr(end, ':');
203 if (colon) {
204 *colon = 0;
205 port = colon + 1;
206 if (!*port)
207 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) {
225 sockfd = socket(ai->ai_family,
226 ai->ai_socktype, ai->ai_protocol);
227 if (sockfd < 0) {
228 saved_errno = errno;
229 continue;
231 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
232 saved_errno = errno;
233 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
234 host,
235 cnt,
236 ai_name(ai),
237 strerror(saved_errno));
238 close(sockfd);
239 sockfd = -1;
240 continue;
242 if (flags & CONNECT_VERBOSE)
243 fprintf(stderr, "%s ", ai_name(ai));
244 break;
247 freeaddrinfo(ai0);
249 if (sockfd < 0)
250 die("unable to connect a socket (%s)", strerror(saved_errno));
252 if (flags & CONNECT_VERBOSE)
253 fprintf(stderr, "done.\n");
255 return sockfd;
258 #else /* NO_IPV6 */
261 * Returns a connected socket() fd, or else die()s.
263 static int git_tcp_connect_sock(char *host, int flags)
265 int sockfd = -1, saved_errno = 0;
266 char *colon, *end;
267 char *port = STR(DEFAULT_GIT_PORT), *ep;
268 struct hostent *he;
269 struct sockaddr_in sa;
270 char **ap;
271 unsigned int nport;
272 int cnt;
274 if (host[0] == '[') {
275 end = strchr(host + 1, ']');
276 if (end) {
277 *end = 0;
278 end++;
279 host++;
280 } else
281 end = host;
282 } else
283 end = host;
284 colon = strchr(end, ':');
286 if (colon) {
287 *colon = 0;
288 port = colon + 1;
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\n", 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 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
311 if (sockfd < 0) {
312 saved_errno = errno;
313 continue;
316 memset(&sa, 0, sizeof sa);
317 sa.sin_family = he->h_addrtype;
318 sa.sin_port = htons(nport);
319 memcpy(&sa.sin_addr, *ap, he->h_length);
321 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
322 saved_errno = errno;
323 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
324 host,
325 cnt,
326 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
327 strerror(saved_errno));
328 close(sockfd);
329 sockfd = -1;
330 continue;
332 if (flags & CONNECT_VERBOSE)
333 fprintf(stderr, "%s ",
334 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
335 break;
338 if (sockfd < 0)
339 die("unable to connect a socket (%s)", strerror(saved_errno));
341 if (flags & CONNECT_VERBOSE)
342 fprintf(stderr, "done.\n");
344 return sockfd;
347 #endif /* NO_IPV6 */
350 static void git_tcp_connect(int fd[2], char *host, int flags)
352 int sockfd = git_tcp_connect_sock(host, flags);
354 fd[0] = sockfd;
355 fd[1] = dup(sockfd);
359 static char *git_proxy_command;
360 static const char *rhost_name;
361 static int rhost_len;
363 static int git_proxy_command_options(const char *var, const char *value,
364 void *cb)
366 if (!strcmp(var, "core.gitproxy")) {
367 const char *for_pos;
368 int matchlen = -1;
369 int hostlen;
371 if (git_proxy_command)
372 return 0;
373 if (!value)
374 return config_error_nonbool(var);
375 /* [core]
376 * ;# matches www.kernel.org as well
377 * gitproxy = netcatter-1 for kernel.org
378 * gitproxy = netcatter-2 for sample.xz
379 * gitproxy = netcatter-default
381 for_pos = strstr(value, " for ");
382 if (!for_pos)
383 /* matches everybody */
384 matchlen = strlen(value);
385 else {
386 hostlen = strlen(for_pos + 5);
387 if (rhost_len < hostlen)
388 matchlen = -1;
389 else if (!strncmp(for_pos + 5,
390 rhost_name + rhost_len - hostlen,
391 hostlen) &&
392 ((rhost_len == hostlen) ||
393 rhost_name[rhost_len - hostlen -1] == '.'))
394 matchlen = for_pos - value;
395 else
396 matchlen = -1;
398 if (0 <= matchlen) {
399 /* core.gitproxy = none for kernel.org */
400 if (matchlen == 4 &&
401 !memcmp(value, "none", 4))
402 matchlen = 0;
403 git_proxy_command = xmemdupz(value, matchlen);
405 return 0;
408 return git_default_config(var, value, cb);
411 static int git_use_proxy(const char *host)
413 rhost_name = host;
414 rhost_len = strlen(host);
415 git_proxy_command = getenv("GIT_PROXY_COMMAND");
416 git_config(git_proxy_command_options, NULL);
417 rhost_name = NULL;
418 return (git_proxy_command && *git_proxy_command);
421 static void git_proxy_connect(int fd[2], char *host)
423 const char *port = STR(DEFAULT_GIT_PORT);
424 char *colon, *end;
425 const char *argv[4];
426 struct child_process proxy;
428 if (host[0] == '[') {
429 end = strchr(host + 1, ']');
430 if (end) {
431 *end = 0;
432 end++;
433 host++;
434 } else
435 end = host;
436 } else
437 end = host;
438 colon = strchr(end, ':');
440 if (colon) {
441 *colon = 0;
442 port = colon + 1;
445 argv[0] = git_proxy_command;
446 argv[1] = host;
447 argv[2] = port;
448 argv[3] = NULL;
449 memset(&proxy, 0, sizeof(proxy));
450 proxy.argv = argv;
451 proxy.in = -1;
452 proxy.out = -1;
453 if (start_command(&proxy))
454 die("cannot start proxy %s", argv[0]);
455 fd[0] = proxy.out; /* read from proxy stdout */
456 fd[1] = proxy.in; /* write to proxy stdin */
459 #define MAX_CMD_LEN 1024
461 char *get_port(char *host)
463 char *end;
464 char *p = strchr(host, ':');
466 if (p) {
467 strtol(p+1, &end, 10);
468 if (*end == '\0') {
469 *p = '\0';
470 return p+1;
474 return NULL;
477 static struct child_process no_fork;
480 * This returns a dummy child_process if the transport protocol does not
481 * need fork(2), or a struct child_process object if it does. Once done,
482 * finish the connection with finish_connect() with the value returned from
483 * this function (it is safe to call finish_connect() with NULL to support
484 * the former case).
486 * If it returns, the connect is successful; it just dies on errors (this
487 * will hopefully be changed in a libification effort, to return NULL when
488 * the connection failed).
490 struct child_process *git_connect(int fd[2], const char *url_orig,
491 const char *prog, int flags)
493 char *url = xstrdup(url_orig);
494 char *host, *path = url;
495 char *end;
496 int c;
497 struct child_process *conn;
498 enum protocol protocol = PROTO_LOCAL;
499 int free_path = 0;
500 char *port = NULL;
501 const char **arg;
502 struct strbuf cmd;
504 /* Without this we cannot rely on waitpid() to tell
505 * what happened to our children.
507 signal(SIGCHLD, SIG_DFL);
509 host = strstr(url, "://");
510 if(host) {
511 *host = '\0';
512 protocol = get_protocol(url);
513 host += 3;
514 c = '/';
515 } else {
516 host = url;
517 c = ':';
520 if (host[0] == '[') {
521 end = strchr(host + 1, ']');
522 if (end) {
523 *end = 0;
524 end++;
525 host++;
526 } else
527 end = host;
528 } else
529 end = host;
531 path = strchr(end, c);
532 if (path && !has_dos_drive_prefix(end)) {
533 if (c == ':') {
534 protocol = PROTO_SSH;
535 *path++ = '\0';
537 } else
538 path = end;
540 if (!path || !*path)
541 die("No path specified. See 'man git-pull' for valid url syntax");
544 * null-terminate hostname and point path to ~ for URL's like this:
545 * ssh://host.xz/~user/repo
547 if (protocol != PROTO_LOCAL && host != url) {
548 char *ptr = path;
549 if (path[1] == '~')
550 path++;
551 else {
552 path = xstrdup(ptr);
553 free_path = 1;
556 *ptr = '\0';
560 * Add support for ssh port: ssh://host.xy:<port>/...
562 if (protocol == PROTO_SSH && host != url)
563 port = get_port(host);
565 if (protocol == PROTO_GIT) {
566 /* These underlying connection commands die() if they
567 * cannot connect.
569 char *target_host = xstrdup(host);
570 if (git_use_proxy(host))
571 git_proxy_connect(fd, host);
572 else
573 git_tcp_connect(fd, host, flags);
575 * Separate original protocol components prog and path
576 * from extended components with a NUL byte.
578 packet_write(fd[1],
579 "%s %s%chost=%s%c",
580 prog, path, 0,
581 target_host, 0);
582 free(target_host);
583 free(url);
584 if (free_path)
585 free(path);
586 return &no_fork;
589 conn = xcalloc(1, sizeof(*conn));
591 strbuf_init(&cmd, MAX_CMD_LEN);
592 strbuf_addstr(&cmd, prog);
593 strbuf_addch(&cmd, ' ');
594 sq_quote_buf(&cmd, path);
595 if (cmd.len >= MAX_CMD_LEN)
596 die("command line too long");
598 conn->in = conn->out = -1;
599 conn->argv = arg = xcalloc(6, sizeof(*arg));
600 if (protocol == PROTO_SSH) {
601 const char *ssh = getenv("GIT_SSH");
602 if (!ssh) ssh = "ssh";
604 *arg++ = ssh;
605 if (port) {
606 *arg++ = "-p";
607 *arg++ = port;
609 *arg++ = host;
611 else {
612 /* remove these from the environment */
613 const char *env[] = {
614 ALTERNATE_DB_ENVIRONMENT,
615 DB_ENVIRONMENT,
616 GIT_DIR_ENVIRONMENT,
617 GIT_WORK_TREE_ENVIRONMENT,
618 GRAFT_ENVIRONMENT,
619 INDEX_ENVIRONMENT,
620 NULL
622 conn->env = env;
623 *arg++ = "sh";
624 *arg++ = "-c";
626 *arg++ = cmd.buf;
627 *arg = NULL;
629 if (start_command(conn))
630 die("unable to fork");
632 fd[0] = conn->out; /* read from child's stdout */
633 fd[1] = conn->in; /* write to child's stdin */
634 strbuf_release(&cmd);
635 free(url);
636 if (free_path)
637 free(path);
638 return conn;
641 int finish_connect(struct child_process *conn)
643 int code;
644 if (!conn || conn == &no_fork)
645 return 0;
647 code = finish_command(conn);
648 free(conn->argv);
649 free(conn);
650 return code;