Use start_command() in git_connect() instead of explicit fork/exec.
[git/git.git] / connect.c
CommitLineData
731043fd 1#include "git-compat-util.h"
f7192598 2#include "cache.h"
41cb7488 3#include "pkt-line.h"
b10d0ec7 4#include "quote.h"
6abf5c0c 5#include "refs.h"
15a1c012 6#include "run-command.h"
6b62816c 7#include "remote.h"
f7192598 8
96f1e58f 9static char *server_capabilities;
211b5f9e 10
2718ff09
LT
11static int check_ref(const char *name, int len, unsigned int flags)
12{
13 if (!flags)
14 return 1;
15
c41e20b3 16 if (len < 5 || memcmp(name, "refs/", 5))
2718ff09
LT
17 return 0;
18
19 /* Skip the "refs/" part */
20 name += 5;
21 len -= 5;
22
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;
26
27 /* REF_HEADS means that we want regular branch heads */
28 if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
29 return 1;
30
31 /* REF_TAGS means that we want tags */
32 if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
33 return 1;
34
35 /* All type bits clear means that we are ok with anything */
36 return !(flags & ~REF_NORMAL);
37}
38
d1c133f5
LT
39/*
40 * Read all the refs from the other end
41 */
1a7141ff 42struct ref **get_remote_heads(int in, struct ref **list,
2718ff09
LT
43 int nr_match, char **match,
44 unsigned int flags)
d1c133f5
LT
45{
46 *list = NULL;
47 for (;;) {
48 struct ref *ref;
49 unsigned char old_sha1[20];
50 static char buffer[1000];
51 char *name;
211b5f9e 52 int len, name_len;
d1c133f5
LT
53
54 len = packet_read_line(in, buffer, sizeof(buffer));
55 if (!len)
56 break;
57 if (buffer[len-1] == '\n')
58 buffer[--len] = 0;
59
60 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
61 die("protocol error: expected sha/ref, got '%s'", buffer);
62 name = buffer + 41;
1a7141ff 63
211b5f9e
JS
64 name_len = strlen(name);
65 if (len != name_len + 41) {
66 if (server_capabilities)
67 free(server_capabilities);
9befac47 68 server_capabilities = xstrdup(name + name_len + 1);
211b5f9e
JS
69 }
70
2718ff09 71 if (!check_ref(name, name_len, flags))
cfee10a7 72 continue;
d1c133f5
LT
73 if (nr_match && !path_match(name, nr_match, match))
74 continue;
90446a00 75 ref = alloc_ref(name_len + 1);
e702496e 76 hashcpy(ref->old_sha1, old_sha1);
90446a00 77 memcpy(ref->name, buffer + 41, name_len + 1);
d1c133f5
LT
78 *list = ref;
79 list = &ref->next;
80 }
81 return list;
82}
83
211b5f9e
JS
84int server_supports(const char *feature)
85{
1f5881bb
JS
86 return server_capabilities &&
87 strstr(server_capabilities, feature) != NULL;
211b5f9e
JS
88}
89
41cb7488
LT
90int get_ack(int fd, unsigned char *result_sha1)
91{
92 static char line[1000];
93 int len = packet_read_line(fd, line, sizeof(line));
94
95 if (!len)
96 die("git-fetch-pack: expected ACK/NAK, got EOF");
97 if (line[len-1] == '\n')
98 line[--len] = 0;
99 if (!strcmp(line, "NAK"))
100 return 0;
cc44c765 101 if (!prefixcmp(line, "ACK ")) {
c4c86f07
JS
102 if (!get_sha1_hex(line+4, result_sha1)) {
103 if (strstr(line+45, "continue"))
104 return 2;
41cb7488 105 return 1;
c4c86f07 106 }
41cb7488
LT
107 }
108 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
109}
110
013e7c7f
LT
111int path_match(const char *path, int nr, char **match)
112{
113 int i;
114 int pathlen = strlen(path);
115
116 for (i = 0; i < nr; i++) {
117 char *s = match[i];
118 int len = strlen(s);
119
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;
9546010b 127 return (i + 1);
013e7c7f
LT
128 }
129 return 0;
130}
131
2386d658
LT
132enum protocol {
133 PROTO_LOCAL = 1,
134 PROTO_SSH,
135 PROTO_GIT,
136};
137
138static enum protocol get_protocol(const char *name)
139{
140 if (!strcmp(name, "ssh"))
141 return PROTO_SSH;
142 if (!strcmp(name, "git"))
143 return PROTO_GIT;
c05186cc
LT
144 if (!strcmp(name, "git+ssh"))
145 return PROTO_SSH;
146 if (!strcmp(name, "ssh+git"))
147 return PROTO_SSH;
72a4f4b6
LT
148 if (!strcmp(name, "file"))
149 return PROTO_LOCAL;
2386d658
LT
150 die("I don't handle protocol '%s'", name);
151}
152
5ba88448
YH
153#define STR_(s) # s
154#define STR(s) STR_(s)
2386d658 155
49744d63 156#ifndef NO_IPV6
4c505f71 157
ba505322
AR
158static const char *ai_name(const struct addrinfo *ai)
159{
160 static char addr[INET_ADDRSTRLEN];
161 if ( AF_INET == ai->ai_family ) {
162 struct sockaddr_in *in;
163 in = (struct sockaddr_in *)ai->ai_addr;
164 inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
165 } else if ( AF_INET6 == ai->ai_family ) {
166 struct sockaddr_in6 *in;
167 in = (struct sockaddr_in6 *)ai->ai_addr;
168 inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
169 } else {
170 strcpy(addr, "(unknown)");
171 }
172 return addr;
173}
174
5ad312be
JL
175/*
176 * Returns a connected socket() fd, or else die()s.
177 */
7841ce79 178static int git_tcp_connect_sock(char *host, int flags)
2386d658 179{
ac3bc6c1 180 int sockfd = -1, saved_errno = 0;
5ba88448 181 char *colon, *end;
554fe20d 182 const char *port = STR(DEFAULT_GIT_PORT);
5ba88448
YH
183 struct addrinfo hints, *ai0, *ai;
184 int gai;
ba505322 185 int cnt = 0;
5ba88448
YH
186
187 if (host[0] == '[') {
188 end = strchr(host + 1, ']');
189 if (end) {
190 *end = 0;
191 end++;
192 host++;
193 } else
194 end = host;
195 } else
196 end = host;
197 colon = strchr(end, ':');
198
ce6f8e7e
LT
199 if (colon) {
200 *colon = 0;
5ba88448 201 port = colon + 1;
608d48b2
LT
202 if (!*port)
203 port = "<none>";
ce6f8e7e 204 }
5ba88448
YH
205
206 memset(&hints, 0, sizeof(hints));
207 hints.ai_socktype = SOCK_STREAM;
208 hints.ai_protocol = IPPROTO_TCP;
209
7841ce79
MT
210 if (flags & CONNECT_VERBOSE)
211 fprintf(stderr, "Looking up %s ... ", host);
212
5ba88448
YH
213 gai = getaddrinfo(host, port, &hints, &ai);
214 if (gai)
608d48b2 215 die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448 216
7841ce79
MT
217 if (flags & CONNECT_VERBOSE)
218 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
219
5ba88448 220 for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be
JL
221 sockfd = socket(ai->ai_family,
222 ai->ai_socktype, ai->ai_protocol);
ac3bc6c1
PB
223 if (sockfd < 0) {
224 saved_errno = errno;
5ba88448 225 continue;
ac3bc6c1 226 }
5ba88448 227 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
ac3bc6c1 228 saved_errno = errno;
7cbf2f24 229 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322
AR
230 host,
231 cnt,
232 ai_name(ai),
ba505322 233 strerror(saved_errno));
5ba88448
YH
234 close(sockfd);
235 sockfd = -1;
236 continue;
2386d658 237 }
ba505322
AR
238 if (flags & CONNECT_VERBOSE)
239 fprintf(stderr, "%s ", ai_name(ai));
5ba88448 240 break;
2386d658
LT
241 }
242
5ba88448 243 freeaddrinfo(ai0);
2386d658 244
2386d658 245 if (sockfd < 0)
ac3bc6c1 246 die("unable to connect a socket (%s)", strerror(saved_errno));
5ba88448 247
7841ce79
MT
248 if (flags & CONNECT_VERBOSE)
249 fprintf(stderr, "done.\n");
250
5ad312be 251 return sockfd;
2386d658
LT
252}
253
49744d63 254#else /* NO_IPV6 */
4c505f71 255
5ad312be
JL
256/*
257 * Returns a connected socket() fd, or else die()s.
258 */
7841ce79 259static int git_tcp_connect_sock(char *host, int flags)
4c505f71 260{
ac3bc6c1 261 int sockfd = -1, saved_errno = 0;
4c505f71
PA
262 char *colon, *end;
263 char *port = STR(DEFAULT_GIT_PORT), *ep;
264 struct hostent *he;
265 struct sockaddr_in sa;
266 char **ap;
267 unsigned int nport;
ba505322 268 int cnt;
4c505f71
PA
269
270 if (host[0] == '[') {
271 end = strchr(host + 1, ']');
272 if (end) {
273 *end = 0;
274 end++;
275 host++;
276 } else
277 end = host;
278 } else
279 end = host;
280 colon = strchr(end, ':');
281
282 if (colon) {
283 *colon = 0;
284 port = colon + 1;
285 }
286
7841ce79
MT
287 if (flags & CONNECT_VERBOSE)
288 fprintf(stderr, "Looking up %s ... ", host);
289
4c505f71
PA
290 he = gethostbyname(host);
291 if (!he)
292 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
293 nport = strtoul(port, &ep, 10);
294 if ( ep == port || *ep ) {
295 /* Not numeric */
296 struct servent *se = getservbyname(port,"tcp");
297 if ( !se )
298 die("Unknown port %s\n", port);
299 nport = se->s_port;
300 }
301
7841ce79
MT
302 if (flags & CONNECT_VERBOSE)
303 fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
304
ba505322 305 for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71 306 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
ac3bc6c1
PB
307 if (sockfd < 0) {
308 saved_errno = errno;
4c505f71 309 continue;
ac3bc6c1 310 }
4c505f71
PA
311
312 memset(&sa, 0, sizeof sa);
313 sa.sin_family = he->h_addrtype;
6573faff 314 sa.sin_port = htons(nport);
c6164218 315 memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71
PA
316
317 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
ac3bc6c1 318 saved_errno = errno;
7cbf2f24 319 fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322
AR
320 host,
321 cnt,
322 inet_ntoa(*(struct in_addr *)&sa.sin_addr),
ba505322 323 strerror(saved_errno));
4c505f71
PA
324 close(sockfd);
325 sockfd = -1;
326 continue;
327 }
ba505322
AR
328 if (flags & CONNECT_VERBOSE)
329 fprintf(stderr, "%s ",
330 inet_ntoa(*(struct in_addr *)&sa.sin_addr));
4c505f71
PA
331 break;
332 }
333
334 if (sockfd < 0)
ac3bc6c1 335 die("unable to connect a socket (%s)", strerror(saved_errno));
4c505f71 336
7841ce79
MT
337 if (flags & CONNECT_VERBOSE)
338 fprintf(stderr, "done.\n");
339
5ad312be
JL
340 return sockfd;
341}
342
343#endif /* NO_IPV6 */
344
345
7841ce79 346static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be 347{
7841ce79 348 int sockfd = git_tcp_connect_sock(host, flags);
5ad312be 349
4c505f71 350 fd[0] = sockfd;
ec587fde 351 fd[1] = dup(sockfd);
4c505f71
PA
352}
353
4c505f71 354
96f1e58f
DR
355static char *git_proxy_command;
356static const char *rhost_name;
e814bc4d 357static int rhost_len;
f8014776
PC
358
359static int git_proxy_command_options(const char *var, const char *value)
360{
e814bc4d 361 if (!strcmp(var, "core.gitproxy")) {
c3df8568
YH
362 const char *for_pos;
363 int matchlen = -1;
364 int hostlen;
365
e814bc4d 366 if (git_proxy_command)
f8014776 367 return 0;
e814bc4d
JH
368 /* [core]
369 * ;# matches www.kernel.org as well
370 * gitproxy = netcatter-1 for kernel.org
371 * gitproxy = netcatter-2 for sample.xz
372 * gitproxy = netcatter-default
373 */
c3df8568 374 for_pos = strstr(value, " for ");
e814bc4d
JH
375 if (!for_pos)
376 /* matches everybody */
377 matchlen = strlen(value);
378 else {
379 hostlen = strlen(for_pos + 5);
380 if (rhost_len < hostlen)
381 matchlen = -1;
382 else if (!strncmp(for_pos + 5,
383 rhost_name + rhost_len - hostlen,
384 hostlen) &&
385 ((rhost_len == hostlen) ||
386 rhost_name[rhost_len - hostlen -1] == '.'))
387 matchlen = for_pos - value;
388 else
389 matchlen = -1;
390 }
391 if (0 <= matchlen) {
392 /* core.gitproxy = none for kernel.org */
a6080a0a 393 if (matchlen == 4 &&
e814bc4d
JH
394 !memcmp(value, "none", 4))
395 matchlen = 0;
182af834 396 git_proxy_command = xmemdupz(value, matchlen);
f8014776 397 }
e814bc4d 398 return 0;
f8014776
PC
399 }
400
401 return git_default_config(var, value);
402}
403
e814bc4d 404static int git_use_proxy(const char *host)
f8014776 405{
e814bc4d
JH
406 rhost_name = host;
407 rhost_len = strlen(host);
f8014776
PC
408 git_proxy_command = getenv("GIT_PROXY_COMMAND");
409 git_config(git_proxy_command_options);
e814bc4d
JH
410 rhost_name = NULL;
411 return (git_proxy_command && *git_proxy_command);
f8014776
PC
412}
413
c78963d2 414static void git_proxy_connect(int fd[2], char *host)
f8014776 415{
554fe20d 416 const char *port = STR(DEFAULT_GIT_PORT);
f8014776 417 char *colon, *end;
15a1c012
SP
418 const char *argv[4];
419 struct child_process proxy;
f8014776
PC
420
421 if (host[0] == '[') {
422 end = strchr(host + 1, ']');
423 if (end) {
424 *end = 0;
425 end++;
426 host++;
427 } else
428 end = host;
429 } else
430 end = host;
431 colon = strchr(end, ':');
432
433 if (colon) {
434 *colon = 0;
435 port = colon + 1;
436 }
437
15a1c012
SP
438 argv[0] = git_proxy_command;
439 argv[1] = host;
440 argv[2] = port;
441 argv[3] = NULL;
442 memset(&proxy, 0, sizeof(proxy));
443 proxy.argv = argv;
444 proxy.in = -1;
445 proxy.out = -1;
446 if (start_command(&proxy))
447 die("cannot start proxy %s", argv[0]);
448 fd[0] = proxy.out; /* read from proxy stdout */
449 fd[1] = proxy.in; /* write to proxy stdin */
f8014776
PC
450}
451
0f503d77
CC
452#define MAX_CMD_LEN 1024
453
2e776665
LT
454char *get_port(char *host)
455{
456 char *end;
457 char *p = strchr(host, ':');
458
459 if (p) {
460 strtol(p+1, &end, 10);
461 if (*end == '\0') {
462 *p = '\0';
463 return p+1;
464 }
465 }
466
467 return NULL;
468}
469
f7192598 470/*
98158e9c
JS
471 * This returns NULL if the transport protocol does not need fork(2), or a
472 * struct child_process object if it does. Once done, finish the connection
f42a5c4e 473 * with finish_connect() with the value returned from this function
98158e9c 474 * (it is safe to call finish_connect() with NULL to support the former
f42a5c4e
FBH
475 * case).
476 *
98158e9c 477 * If it returns, the connect is successful; it just dies on errors.
f7192598 478 */
98158e9c
JS
479struct child_process *git_connect(int fd[2], char *url,
480 const char *prog, int flags)
f7192598 481{
faea9ccb 482 char *host, *path = url;
356bece0
YH
483 char *end;
484 int c;
98158e9c 485 struct child_process *conn;
faea9ccb 486 enum protocol protocol = PROTO_LOCAL;
da2a95b2 487 int free_path = 0;
2e776665 488 char *port = NULL;
f364cb88
JS
489 const char **arg;
490 struct strbuf cmd;
faea9ccb 491
f0b7367c
JH
492 /* Without this we cannot rely on waitpid() to tell
493 * what happened to our children.
494 */
495 signal(SIGCHLD, SIG_DFL);
496
faea9ccb
AE
497 host = strstr(url, "://");
498 if(host) {
499 *host = '\0';
500 protocol = get_protocol(url);
501 host += 3;
356bece0
YH
502 c = '/';
503 } else {
f7192598 504 host = url;
356bece0
YH
505 c = ':';
506 }
507
508 if (host[0] == '[') {
509 end = strchr(host + 1, ']');
510 if (end) {
511 *end = 0;
512 end++;
513 host++;
514 } else
515 end = host;
516 } else
517 end = host;
518
519 path = strchr(end, c);
72a4f4b6
LT
520 if (path) {
521 if (c == ':') {
faea9ccb 522 protocol = PROTO_SSH;
356bece0 523 *path++ = '\0';
72a4f4b6
LT
524 }
525 } else
526 path = end;
2386d658 527
faea9ccb
AE
528 if (!path || !*path)
529 die("No path specified. See 'man git-pull' for valid url syntax");
530
531 /*
532 * null-terminate hostname and point path to ~ for URL's like this:
533 * ssh://host.xz/~user/repo
534 */
535 if (protocol != PROTO_LOCAL && host != url) {
536 char *ptr = path;
537 if (path[1] == '~')
538 path++;
da2a95b2 539 else {
9befac47 540 path = xstrdup(ptr);
da2a95b2
SH
541 free_path = 1;
542 }
faea9ccb
AE
543
544 *ptr = '\0';
545 }
546
2e776665
LT
547 /*
548 * Add support for ssh port: ssh://host.xy:<port>/...
549 */
550 if (protocol == PROTO_SSH && host != url)
551 port = get_port(host);
552
f8014776 553 if (protocol == PROTO_GIT) {
5ad312be
JL
554 /* These underlying connection commands die() if they
555 * cannot connect.
556 */
9befac47 557 char *target_host = xstrdup(host);
e814bc4d 558 if (git_use_proxy(host))
c78963d2 559 git_proxy_connect(fd, host);
da2a95b2 560 else
7841ce79 561 git_tcp_connect(fd, host, flags);
5ad312be
JL
562 /*
563 * Separate original protocol components prog and path
564 * from extended components with a NUL byte.
565 */
566 packet_write(fd[1],
567 "%s %s%chost=%s%c",
568 prog, path, 0,
569 target_host, 0);
570 free(target_host);
da2a95b2
SH
571 if (free_path)
572 free(path);
98158e9c 573 return NULL;
f8014776 574 }
2386d658 575
98158e9c 576 conn = xcalloc(1, sizeof(*conn));
2e776665 577
f364cb88
JS
578 strbuf_init(&cmd, MAX_CMD_LEN);
579 strbuf_addstr(&cmd, prog);
580 strbuf_addch(&cmd, ' ');
581 sq_quote_buf(&cmd, path);
582 if (cmd.len >= MAX_CMD_LEN)
583 die("command line too long");
584
585 conn->in = conn->out = -1;
586 conn->argv = arg = xcalloc(6, sizeof(*arg));
587 if (protocol == PROTO_SSH) {
588 const char *ssh = getenv("GIT_SSH");
589 if (!ssh) ssh = "ssh";
590
591 *arg++ = ssh;
592 if (port) {
593 *arg++ = "-p";
594 *arg++ = port;
4852f723 595 }
f364cb88
JS
596 *arg++ = host;
597 }
598 else {
599 /* remove these from the environment */
600 const char *env[] = {
601 ALTERNATE_DB_ENVIRONMENT,
602 DB_ENVIRONMENT,
603 GIT_DIR_ENVIRONMENT,
604 GIT_WORK_TREE_ENVIRONMENT,
605 GRAFT_ENVIRONMENT,
606 INDEX_ENVIRONMENT,
607 NULL
608 };
609 conn->env = env;
610 *arg++ = "sh";
611 *arg++ = "-c";
016fb48b 612 }
f364cb88
JS
613 *arg++ = cmd.buf;
614 *arg = NULL;
615
616 if (start_command(conn))
617 die("unable to fork");
618
619 fd[0] = conn->out; /* read from child's stdout */
620 fd[1] = conn->in; /* write to child's stdin */
621 strbuf_release(&cmd);
da2a95b2
SH
622 if (free_path)
623 free(path);
98158e9c 624 return conn;
f7192598
LT
625}
626
98158e9c 627int finish_connect(struct child_process *conn)
f7192598 628{
f364cb88 629 int code;
98158e9c 630 if (!conn)
f42a5c4e
FBH
631 return 0;
632
f364cb88
JS
633 code = finish_command(conn);
634 free(conn->argv);
98158e9c 635 free(conn);
f364cb88 636 return code;
f7192598 637}