b8aea351b8042045feb7bae220290df5d81984a7
[git/git.git] / connect.c
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "quote.h"
4 #include "refs.h"
5 #include <sys/wait.h>
6 #include <sys/socket.h>
7 #include <netinet/in.h>
8 #include <arpa/inet.h>
9 #include <netdb.h>
10
11 static char *server_capabilities = "";
12
13 /*
14 * Read all the refs from the other end
15 */
16 struct ref **get_remote_heads(int in, struct ref **list,
17 int nr_match, char **match, int ignore_funny)
18 {
19 *list = NULL;
20 for (;;) {
21 struct ref *ref;
22 unsigned char old_sha1[20];
23 static char buffer[1000];
24 char *name;
25 int len, name_len;
26
27 len = packet_read_line(in, buffer, sizeof(buffer));
28 if (!len)
29 break;
30 if (buffer[len-1] == '\n')
31 buffer[--len] = 0;
32
33 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
34 die("protocol error: expected sha/ref, got '%s'", buffer);
35 name = buffer + 41;
36
37 if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
38 check_ref_format(name + 5))
39 continue;
40
41 name_len = strlen(name);
42 if (len != name_len + 41) {
43 if (server_capabilities)
44 free(server_capabilities);
45 server_capabilities = strdup(name + name_len + 1);
46 }
47
48 if (nr_match && !path_match(name, nr_match, match))
49 continue;
50 ref = xcalloc(1, sizeof(*ref) + len - 40);
51 memcpy(ref->old_sha1, old_sha1, 20);
52 memcpy(ref->name, buffer + 41, len - 40);
53 *list = ref;
54 list = &ref->next;
55 }
56 return list;
57 }
58
59 int server_supports(const char *feature)
60 {
61 return strstr(feature, server_capabilities) != NULL;
62 }
63
64 int get_ack(int fd, unsigned char *result_sha1)
65 {
66 static char line[1000];
67 int len = packet_read_line(fd, line, sizeof(line));
68
69 if (!len)
70 die("git-fetch-pack: expected ACK/NAK, got EOF");
71 if (line[len-1] == '\n')
72 line[--len] = 0;
73 if (!strcmp(line, "NAK"))
74 return 0;
75 if (!strncmp(line, "ACK ", 3)) {
76 if (!get_sha1_hex(line+4, result_sha1)) {
77 if (strstr(line+45, "continue"))
78 return 2;
79 return 1;
80 }
81 }
82 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
83 }
84
85 int path_match(const char *path, int nr, char **match)
86 {
87 int i;
88 int pathlen = strlen(path);
89
90 for (i = 0; i < nr; i++) {
91 char *s = match[i];
92 int len = strlen(s);
93
94 if (!len || len > pathlen)
95 continue;
96 if (memcmp(path + pathlen - len, s, len))
97 continue;
98 if (pathlen > len && path[pathlen - len - 1] != '/')
99 continue;
100 *s = 0;
101 return 1;
102 }
103 return 0;
104 }
105
106 struct refspec {
107 char *src;
108 char *dst;
109 char force;
110 };
111
112 /*
113 * A:B means fast forward remote B with local A.
114 * +A:B means overwrite remote B with local A.
115 * +A is a shorthand for +A:A.
116 * A is a shorthand for A:A.
117 */
118 static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
119 {
120 int i;
121 struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
122 for (i = 0; i < nr_refspec; i++) {
123 char *sp, *dp, *ep;
124 sp = refspec[i];
125 if (*sp == '+') {
126 rs[i].force = 1;
127 sp++;
128 }
129 ep = strchr(sp, ':');
130 if (ep) {
131 dp = ep + 1;
132 *ep = 0;
133 }
134 else
135 dp = sp;
136 rs[i].src = sp;
137 rs[i].dst = dp;
138 }
139 rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
140 return rs;
141 }
142
143 static int count_refspec_match(const char *pattern,
144 struct ref *refs,
145 struct ref **matched_ref)
146 {
147 int match;
148 int patlen = strlen(pattern);
149
150 for (match = 0; refs; refs = refs->next) {
151 char *name = refs->name;
152 int namelen = strlen(name);
153 if (namelen < patlen ||
154 memcmp(name + namelen - patlen, pattern, patlen))
155 continue;
156 if (namelen != patlen && name[namelen - patlen - 1] != '/')
157 continue;
158 match++;
159 *matched_ref = refs;
160 }
161 return match;
162 }
163
164 static void link_dst_tail(struct ref *ref, struct ref ***tail)
165 {
166 **tail = ref;
167 *tail = &ref->next;
168 **tail = NULL;
169 }
170
171 static struct ref *try_explicit_object_name(const char *name)
172 {
173 unsigned char sha1[20];
174 struct ref *ref;
175 int len;
176 if (get_sha1(name, sha1))
177 return NULL;
178 len = strlen(name) + 1;
179 ref = xcalloc(1, sizeof(*ref) + len);
180 memcpy(ref->name, name, len);
181 memcpy(ref->new_sha1, sha1, 20);
182 return ref;
183 }
184
185 static int match_explicit_refs(struct ref *src, struct ref *dst,
186 struct ref ***dst_tail, struct refspec *rs)
187 {
188 int i, errs;
189 for (i = errs = 0; rs[i].src; i++) {
190 struct ref *matched_src, *matched_dst;
191
192 matched_src = matched_dst = NULL;
193 switch (count_refspec_match(rs[i].src, src, &matched_src)) {
194 case 1:
195 break;
196 case 0:
197 /* The source could be in the get_sha1() format
198 * not a reference name.
199 */
200 matched_src = try_explicit_object_name(rs[i].src);
201 if (matched_src)
202 break;
203 errs = 1;
204 error("src refspec %s does not match any.",
205 rs[i].src);
206 break;
207 default:
208 errs = 1;
209 error("src refspec %s matches more than one.",
210 rs[i].src);
211 break;
212 }
213 switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
214 case 1:
215 break;
216 case 0:
217 if (!memcmp(rs[i].dst, "refs/", 5)) {
218 int len = strlen(rs[i].dst) + 1;
219 matched_dst = xcalloc(1, sizeof(*dst) + len);
220 memcpy(matched_dst->name, rs[i].dst, len);
221 link_dst_tail(matched_dst, dst_tail);
222 }
223 else if (!strcmp(rs[i].src, rs[i].dst) &&
224 matched_src) {
225 /* pushing "master:master" when
226 * remote does not have master yet.
227 */
228 int len = strlen(matched_src->name) + 1;
229 matched_dst = xcalloc(1, sizeof(*dst) + len);
230 memcpy(matched_dst->name, matched_src->name,
231 len);
232 link_dst_tail(matched_dst, dst_tail);
233 }
234 else {
235 errs = 1;
236 error("dst refspec %s does not match any "
237 "existing ref on the remote and does "
238 "not start with refs/.", rs[i].dst);
239 }
240 break;
241 default:
242 errs = 1;
243 error("dst refspec %s matches more than one.",
244 rs[i].dst);
245 break;
246 }
247 if (errs)
248 continue;
249 if (matched_dst->peer_ref) {
250 errs = 1;
251 error("dst ref %s receives from more than one src.",
252 matched_dst->name);
253 }
254 else {
255 matched_dst->peer_ref = matched_src;
256 matched_dst->force = rs[i].force;
257 }
258 }
259 return -errs;
260 }
261
262 static struct ref *find_ref_by_name(struct ref *list, const char *name)
263 {
264 for ( ; list; list = list->next)
265 if (!strcmp(list->name, name))
266 return list;
267 return NULL;
268 }
269
270 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
271 int nr_refspec, char **refspec, int all)
272 {
273 struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
274
275 if (nr_refspec)
276 return match_explicit_refs(src, dst, dst_tail, rs);
277
278 /* pick the remainder */
279 for ( ; src; src = src->next) {
280 struct ref *dst_peer;
281 if (src->peer_ref)
282 continue;
283 dst_peer = find_ref_by_name(dst, src->name);
284 if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
285 continue;
286 if (!dst_peer) {
287 /* Create a new one and link it */
288 int len = strlen(src->name) + 1;
289 dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
290 memcpy(dst_peer->name, src->name, len);
291 memcpy(dst_peer->new_sha1, src->new_sha1, 20);
292 link_dst_tail(dst_peer, dst_tail);
293 }
294 dst_peer->peer_ref = src;
295 }
296 return 0;
297 }
298
299 enum protocol {
300 PROTO_LOCAL = 1,
301 PROTO_SSH,
302 PROTO_GIT,
303 };
304
305 static enum protocol get_protocol(const char *name)
306 {
307 if (!strcmp(name, "ssh"))
308 return PROTO_SSH;
309 if (!strcmp(name, "git"))
310 return PROTO_GIT;
311 if (!strcmp(name, "git+ssh"))
312 return PROTO_SSH;
313 if (!strcmp(name, "ssh+git"))
314 return PROTO_SSH;
315 die("I don't handle protocol '%s'", name);
316 }
317
318 #define STR_(s) # s
319 #define STR(s) STR_(s)
320
321 #ifndef NO_IPV6
322
323 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
324 {
325 int sockfd = -1;
326 char *colon, *end;
327 char *port = STR(DEFAULT_GIT_PORT);
328 struct addrinfo hints, *ai0, *ai;
329 int gai;
330
331 if (host[0] == '[') {
332 end = strchr(host + 1, ']');
333 if (end) {
334 *end = 0;
335 end++;
336 host++;
337 } else
338 end = host;
339 } else
340 end = host;
341 colon = strchr(end, ':');
342
343 if (colon) {
344 *colon = 0;
345 port = colon + 1;
346 }
347
348 memset(&hints, 0, sizeof(hints));
349 hints.ai_socktype = SOCK_STREAM;
350 hints.ai_protocol = IPPROTO_TCP;
351
352 gai = getaddrinfo(host, port, &hints, &ai);
353 if (gai)
354 die("Unable to look up %s (%s)", host, gai_strerror(gai));
355
356 for (ai0 = ai; ai; ai = ai->ai_next) {
357 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
358 if (sockfd < 0)
359 continue;
360 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
361 close(sockfd);
362 sockfd = -1;
363 continue;
364 }
365 break;
366 }
367
368 freeaddrinfo(ai0);
369
370 if (sockfd < 0)
371 die("unable to connect a socket (%s)", strerror(errno));
372
373 fd[0] = sockfd;
374 fd[1] = sockfd;
375 packet_write(sockfd, "%s %s\n", prog, path);
376 return 0;
377 }
378
379 #else /* NO_IPV6 */
380
381 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
382 {
383 int sockfd = -1;
384 char *colon, *end;
385 char *port = STR(DEFAULT_GIT_PORT), *ep;
386 struct hostent *he;
387 struct sockaddr_in sa;
388 char **ap;
389 unsigned int nport;
390
391 if (host[0] == '[') {
392 end = strchr(host + 1, ']');
393 if (end) {
394 *end = 0;
395 end++;
396 host++;
397 } else
398 end = host;
399 } else
400 end = host;
401 colon = strchr(end, ':');
402
403 if (colon) {
404 *colon = 0;
405 port = colon + 1;
406 }
407
408
409 he = gethostbyname(host);
410 if (!he)
411 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
412 nport = strtoul(port, &ep, 10);
413 if ( ep == port || *ep ) {
414 /* Not numeric */
415 struct servent *se = getservbyname(port,"tcp");
416 if ( !se )
417 die("Unknown port %s\n", port);
418 nport = se->s_port;
419 }
420
421 for (ap = he->h_addr_list; *ap; ap++) {
422 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
423 if (sockfd < 0)
424 continue;
425
426 memset(&sa, 0, sizeof sa);
427 sa.sin_family = he->h_addrtype;
428 sa.sin_port = htons(nport);
429 memcpy(&sa.sin_addr, ap, he->h_length);
430
431 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
432 close(sockfd);
433 sockfd = -1;
434 continue;
435 }
436 break;
437 }
438
439 if (sockfd < 0)
440 die("unable to connect a socket (%s)", strerror(errno));
441
442 fd[0] = sockfd;
443 fd[1] = sockfd;
444 packet_write(sockfd, "%s %s\n", prog, path);
445 return 0;
446 }
447
448 #endif /* NO_IPV6 */
449
450 /*
451 * Yeah, yeah, fixme. Need to pass in the heads etc.
452 */
453 int git_connect(int fd[2], char *url, const char *prog)
454 {
455 char command[1024];
456 char *host, *path;
457 char *colon;
458 int pipefd[2][2];
459 pid_t pid;
460 enum protocol protocol;
461
462 host = NULL;
463 path = url;
464 colon = strchr(url, ':');
465 protocol = PROTO_LOCAL;
466 if (colon) {
467 *colon = 0;
468 host = url;
469 path = colon+1;
470 protocol = PROTO_SSH;
471 if (!memcmp(path, "//", 2)) {
472 char *slash = strchr(path + 2, '/');
473 if (slash) {
474 int nr = slash - path - 2;
475 memmove(path, path+2, nr);
476 path[nr] = 0;
477 protocol = get_protocol(url);
478 host = path;
479 path = slash;
480 }
481 }
482 }
483
484 if (protocol == PROTO_GIT)
485 return git_tcp_connect(fd, prog, host, path);
486
487 if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
488 die("unable to create pipe pair for communication");
489 pid = fork();
490 if (!pid) {
491 snprintf(command, sizeof(command), "%s %s", prog,
492 sq_quote(path));
493 dup2(pipefd[1][0], 0);
494 dup2(pipefd[0][1], 1);
495 close(pipefd[0][0]);
496 close(pipefd[0][1]);
497 close(pipefd[1][0]);
498 close(pipefd[1][1]);
499 if (protocol == PROTO_SSH) {
500 const char *ssh, *ssh_basename;
501 ssh = getenv("GIT_SSH");
502 if (!ssh) ssh = "ssh";
503 ssh_basename = strrchr(ssh, '/');
504 if (!ssh_basename)
505 ssh_basename = ssh;
506 else
507 ssh_basename++;
508 execlp(ssh, ssh_basename, host, command, NULL);
509 }
510 else
511 execlp("sh", "sh", "-c", command, NULL);
512 die("exec failed");
513 }
514 fd[0] = pipefd[0][0];
515 fd[1] = pipefd[1][1];
516 close(pipefd[0][1]);
517 close(pipefd[1][0]);
518 return pid;
519 }
520
521 int finish_connect(pid_t pid)
522 {
523 int ret;
524
525 for (;;) {
526 ret = waitpid(pid, NULL, 0);
527 if (!ret)
528 break;
529 if (errno != EINTR)
530 break;
531 }
532 return ret;
533 }