[thirdparty/git.git] / connect.c

#include "cache.h"
#include "pkt-line.h"
#include "quote.h"
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

/*
 * Read all the refs from the other end
 */
struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match)
{
	*list = NULL;
	for (;;) {
		struct ref *ref;
		unsigned char old_sha1[20];
		static char buffer[1000];
		char *name;
		int len;

		len = packet_read_line(in, buffer, sizeof(buffer));
		if (!len)
			break;
		if (buffer[len-1] == '\n')
			buffer[--len] = 0;

		if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
			die("protocol error: expected sha/ref, got '%s'", buffer);
		name = buffer + 41;
		if (nr_match && !path_match(name, nr_match, match))
			continue;
		ref = xcalloc(1, sizeof(*ref) + len - 40);
		memcpy(ref->old_sha1, old_sha1, 20);
		memcpy(ref->name, buffer + 41, len - 40);
		*list = ref;
		list = &ref->next;
	}
	return list;
}

int get_ack(int fd, unsigned char *result_sha1)
{
	static char line[1000];
	int len = packet_read_line(fd, line, sizeof(line));

	if (!len)
		die("git-fetch-pack: expected ACK/NAK, got EOF");
	if (line[len-1] == '\n')
		line[--len] = 0;
	if (!strcmp(line, "NAK"))
		return 0;
	if (!strncmp(line, "ACK ", 3)) {
		if (!get_sha1_hex(line+4, result_sha1))
			return 1;
	}
	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
}

int path_match(const char *path, int nr, char **match)
{
	int i;
	int pathlen = strlen(path);

	for (i = 0; i < nr; i++) {
		char *s = match[i];
		int len = strlen(s);

		if (!len || len > pathlen)
			continue;
		if (memcmp(path + pathlen - len, s, len))
			continue;
		if (pathlen > len && path[pathlen - len - 1] != '/')
			continue;
		*s = 0;
		return 1;
	}
	return 0;
}

struct refspec {
	char *src;
	char *dst;
	char force;
};

/*
 * A:B means fast forward remote B with local A.
 * +A:B means overwrite remote B with local A.
 * +A is a shorthand for +A:A.
 * A is a shorthand for A:A.
 */
static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
{
	int i;
	struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
	for (i = 0; i < nr_refspec; i++) {
		char *sp, *dp, *ep;
		sp = refspec[i];
		if (*sp == '+') {
			rs[i].force = 1;
			sp++;
		}
		ep = strchr(sp, ':');
		if (ep) {
			dp = ep + 1;
			*ep = 0;
		}
		else
			dp = sp;
		rs[i].src = sp;
		rs[i].dst = dp;
	}
	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	return rs;
}

static int count_refspec_match(const char *pattern,
			       struct ref *refs,
			       struct ref **matched_ref)
{
	int match;
	int patlen = strlen(pattern);

	for (match = 0; refs; refs = refs->next) {
		char *name = refs->name;
		int namelen = strlen(name);
		if (namelen < patlen ||
		    memcmp(name + namelen - patlen, pattern, patlen))
			continue;
		if (namelen != patlen && name[namelen - patlen - 1] != '/')
			continue;
		match++;
		*matched_ref = refs;
	}
	return match;
}

static void link_dst_tail(struct ref *ref, struct ref ***tail)
{
	**tail = ref;
	*tail = &ref->next;
	**tail = NULL;
}

static struct ref *try_explicit_object_name(const char *name)
{
	unsigned char sha1[20];
	struct ref *ref;
	int len;
	if (get_sha1(name, sha1))
		return NULL;
	len = strlen(name) + 1;
	ref = xcalloc(1, sizeof(*ref) + len);
	memcpy(ref->name, name, len);
	memcpy(ref->new_sha1, sha1, 20);
	return ref;
}

static int match_explicit_refs(struct ref *src, struct ref *dst,
			       struct ref ***dst_tail, struct refspec *rs)
{
	int i, errs;
	for (i = errs = 0; rs[i].src; i++) {
		struct ref *matched_src, *matched_dst;

		matched_src = matched_dst = NULL;
		switch (count_refspec_match(rs[i].src, src, &matched_src)) {
		case 1:
			break;
		case 0:
			/* The source could be in the get_sha1() format
			 * not a reference name.
			 */
			matched_src = try_explicit_object_name(rs[i].src);
			if (matched_src)
				break;
			errs = 1;
			error("src refspec %s does not match any.",
			      rs[i].src);
			break;
		default:
			errs = 1;
			error("src refspec %s matches more than one.",
			      rs[i].src);
			break;
		}
		switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
		case 1:
			break;
		case 0:
			if (!memcmp(rs[i].dst, "refs/", 5)) {
				int len = strlen(rs[i].dst) + 1;
				matched_dst = xcalloc(1, sizeof(*dst) + len);
				memcpy(matched_dst->name, rs[i].dst, len);
				link_dst_tail(matched_dst, dst_tail);
			}
			else if (!strcmp(rs[i].src, rs[i].dst) &&
				 matched_src) {
				/* pushing "master:master" when
				 * remote does not have master yet.
				 */
				int len = strlen(matched_src->name) + 1;
				matched_dst = xcalloc(1, sizeof(*dst) + len);
				memcpy(matched_dst->name, matched_src->name,
				       len);
				link_dst_tail(matched_dst, dst_tail);
			}
			else {
				errs = 1;
				error("dst refspec %s does not match any "
				      "existing ref on the remote and does "
				      "not start with refs/.", rs[i].dst);
			}
			break;
		default:
			errs = 1;
			error("dst refspec %s matches more than one.",
			      rs[i].dst);
			break;
		}
		if (errs)
			continue;
		if (matched_dst->peer_ref) {
			errs = 1;
			error("dst ref %s receives from more than one src.",
			      matched_dst->name);
		}
		else {
			matched_dst->peer_ref = matched_src;
			matched_dst->force = rs[i].force;
		}
	}
	return -errs;
}

static struct ref *find_ref_by_name(struct ref *list, const char *name)
{
	for ( ; list; list = list->next)
		if (!strcmp(list->name, name))
			return list;
	return NULL;
}

int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
	       int nr_refspec, char **refspec, int all)
{
	struct refspec *rs = parse_ref_spec(nr_refspec, refspec);

	if (nr_refspec)
		return match_explicit_refs(src, dst, dst_tail, rs);

	/* pick the remainder */
	for ( ; src; src = src->next) {
		struct ref *dst_peer;
		if (src->peer_ref)
			continue;
		dst_peer = find_ref_by_name(dst, src->name);
		if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
			continue;
		if (!dst_peer) {
			/* Create a new one and link it */
			int len = strlen(src->name) + 1;
			dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
			memcpy(dst_peer->name, src->name, len);
			memcpy(dst_peer->new_sha1, src->new_sha1, 20);
			link_dst_tail(dst_peer, dst_tail);
		}
		dst_peer->peer_ref = src;
	}
	return 0;
}

enum protocol {
	PROTO_LOCAL = 1,
	PROTO_SSH,
	PROTO_GIT,
};

static enum protocol get_protocol(const char *name)
{
	if (!strcmp(name, "ssh"))
		return PROTO_SSH;
	if (!strcmp(name, "git"))
		return PROTO_GIT;
	die("I don't handle protocol '%s'", name);
}

#define STR_(s)	# s
#define STR(s)	STR_(s)

#ifndef NO_IPV6

static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
{
	int sockfd = -1;
	char *colon, *end;
	char *port = STR(DEFAULT_GIT_PORT);
	struct addrinfo hints, *ai0, *ai;
	int gai;

	if (host[0] == '[') {
		end = strchr(host + 1, ']');
		if (end) {
			*end = 0;
			end++;
			host++;
		} else
			end = host;
	} else
		end = host;
	colon = strchr(end, ':');

	if (colon) {
		*colon = 0;
		port = colon + 1;
	}

	memset(&hints, 0, sizeof(hints));
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;

	gai = getaddrinfo(host, port, &hints, &ai);
	if (gai)
		die("Unable to look up %s (%s)", host, gai_strerror(gai));

	for (ai0 = ai; ai; ai = ai->ai_next) {
		sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
		if (sockfd < 0)
			continue;
		if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
			close(sockfd);
			sockfd = -1;
			continue;
		}
		break;
	}

	freeaddrinfo(ai0);

	if (sockfd < 0)
		die("unable to connect a socket (%s)", strerror(errno));

	fd[0] = sockfd;
	fd[1] = sockfd;
	packet_write(sockfd, "%s %s\n", prog, path);
	return 0;
}

#else /* NO_IPV6 */

static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
{
	int sockfd = -1;
	char *colon, *end;
	char *port = STR(DEFAULT_GIT_PORT), *ep;
	struct hostent *he;
	struct sockaddr_in sa;
	char **ap;
	unsigned int nport;

	if (host[0] == '[') {
		end = strchr(host + 1, ']');
		if (end) {
			*end = 0;
			end++;
			host++;
		} else
			end = host;
	} else
		end = host;
	colon = strchr(end, ':');

	if (colon) {
		*colon = 0;
		port = colon + 1;
	}


	he = gethostbyname(host);
	if (!he)
		die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	nport = strtoul(port, &ep, 10);
	if ( ep == port || *ep ) {
		/* Not numeric */
		struct servent *se = getservbyname(port,"tcp");
		if ( !se )
			die("Unknown port %s\n", port);
		nport = se->s_port;
	}

	for (ap = he->h_addr_list; *ap; ap++) {
		sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
		if (sockfd < 0)
			continue;

		memset(&sa, 0, sizeof sa);
		sa.sin_family = he->h_addrtype;
		sa.sin_port = nport;
		memcpy(&sa.sin_addr, ap, he->h_length);

		if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
			close(sockfd);
			sockfd = -1;
			continue;
		}
		break;
	}

	if (sockfd < 0)
		die("unable to connect a socket (%s)", strerror(errno));

	fd[0] = sockfd;
	fd[1] = sockfd;
	packet_write(sockfd, "%s %s\n", prog, path);
	return 0;
}

#endif /* NO_IPV6 */

/*
 * Yeah, yeah, fixme. Need to pass in the heads etc.
 */
int git_connect(int fd[2], char *url, const char *prog)
{
	char command[1024];
	char *host, *path;
	char *colon;
	int pipefd[2][2];
	pid_t pid;
	enum protocol protocol;

	host = NULL;
	path = url;
	colon = strchr(url, ':');
	protocol = PROTO_LOCAL;
	if (colon) {
		*colon = 0;
		host = url;
		path = colon+1;
		protocol = PROTO_SSH;
		if (!memcmp(path, "//", 2)) {
			char *slash = strchr(path + 2, '/');
			if (slash) {
				int nr = slash - path - 2;
				memmove(path, path+2, nr);
				path[nr] = 0;
				protocol = get_protocol(url);
				host = path;
				path = slash;
			}
		}
	}

	if (protocol == PROTO_GIT)
		return git_tcp_connect(fd, prog, host, path);

	if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
		die("unable to create pipe pair for communication");
	pid = fork();
	if (!pid) {
		snprintf(command, sizeof(command), "%s %s", prog,
			 sq_quote(path));
		dup2(pipefd[1][0], 0);
		dup2(pipefd[0][1], 1);
		close(pipefd[0][0]);
		close(pipefd[0][1]);
		close(pipefd[1][0]);
		close(pipefd[1][1]);
		if (protocol == PROTO_SSH) {
			const char *ssh, *ssh_basename;
			ssh = getenv("GIT_SSH");
			if (!ssh) ssh = "ssh";
			ssh_basename = strrchr(ssh, '/');
			if (!ssh_basename)
				ssh_basename = ssh;
			else
				ssh_basename++;
			execlp(ssh, ssh_basename, host, command, NULL);
		}
		else
			execlp("sh", "sh", "-c", command, NULL);
		die("exec failed");
	}		
	fd[0] = pipefd[0][0];
	fd[1] = pipefd[1][1];
	close(pipefd[0][1]);
	close(pipefd[1][0]);
	return pid;
}

int finish_connect(pid_t pid)
{
	int ret;

	for (;;) {
		ret = waitpid(pid, NULL, 0);
		if (!ret)
			break;
		if (errno != EINTR)
			break;
	}
	return ret;
}
Commit	Line	Data
f7192598	1	#include "cache.h"
41cb7488	2	#include "pkt-line.h"
b10d0ec7	3	#include "quote.h"
f7192598	4	#include <sys/wait.h>
2386d658 LT	5	#include <sys/socket.h>
	6	#include <netinet/in.h>
	7	#include <arpa/inet.h>
	8	#include <netdb.h>
f7192598	9
d1c133f5 LT	10	/*
	11	* Read all the refs from the other end
	12	*/
	13	struct ref get_remote_heads(int in, struct ref list, int nr_match, char **match)
	14	{
	15	*list = NULL;
	16	for (;;) {
	17	struct ref *ref;
	18	unsigned char old_sha1[20];
	19	static char buffer[1000];
	20	char *name;
	21	int len;
	22
	23	len = packet_read_line(in, buffer, sizeof(buffer));
	24	if (!len)
	25	break;
	26	if (buffer[len-1] == '\n')
	27	buffer[--len] = 0;
	28
	29	if (len < 42 \|\| get_sha1_hex(buffer, old_sha1) \|\| buffer[40] != ' ')
	30	die("protocol error: expected sha/ref, got '%s'", buffer);
	31	name = buffer + 41;
	32	if (nr_match && !path_match(name, nr_match, match))
	33	continue;
f88395ac	34	ref = xcalloc(1, sizeof(*ref) + len - 40);
d1c133f5	35	memcpy(ref->old_sha1, old_sha1, 20);
d1c133f5	36	memcpy(ref->name, buffer + 41, len - 40);
d1c133f5 LT	37	*list = ref;
	38	list = &ref->next;
	39	}
	40	return list;
	41	}
	42
41cb7488 LT	43	int get_ack(int fd, unsigned char *result_sha1)
	44	{
	45	static char line[1000];
	46	int len = packet_read_line(fd, line, sizeof(line));
	47
	48	if (!len)
	49	die("git-fetch-pack: expected ACK/NAK, got EOF");
	50	if (line[len-1] == '\n')
	51	line[--len] = 0;
	52	if (!strcmp(line, "NAK"))
	53	return 0;
	54	if (!strncmp(line, "ACK ", 3)) {
	55	if (!get_sha1_hex(line+4, result_sha1))
	56	return 1;
	57	}
	58	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
	59	}
	60
013e7c7f LT	61	int path_match(const char path, int nr, char *match)
	62	{
	63	int i;
	64	int pathlen = strlen(path);
	65
	66	for (i = 0; i < nr; i++) {
	67	char *s = match[i];
	68	int len = strlen(s);
	69
	70	if (!len \|\| len > pathlen)
	71	continue;
	72	if (memcmp(path + pathlen - len, s, len))
	73	continue;
	74	if (pathlen > len && path[pathlen - len - 1] != '/')
	75	continue;
	76	*s = 0;
	77	return 1;
	78	}
	79	return 0;
	80	}
	81
f88395ac JH	82	struct refspec {
	83	char *src;
	84	char *dst;
ff27adf3	85	char force;
f88395ac JH	86	};
f88395ac JH	87
ff27adf3 JH	88	/*
	89	* A:B means fast forward remote B with local A.
	90	* +A:B means overwrite remote B with local A.
	91	* +A is a shorthand for +A:A.
	92	* A is a shorthand for A:A.
	93	*/
f88395ac JH	94	static struct refspec parse_ref_spec(int nr_refspec, char *refspec)
	95	{
	96	int i;
ff27adf3	97	struct refspec rs = xcalloc(sizeof(rs), (nr_refspec + 1));
f88395ac JH	98	for (i = 0; i < nr_refspec; i++) {
	99	char sp, dp, *ep;
	100	sp = refspec[i];
ff27adf3 JH	101	if (*sp == '+') {
	102	rs[i].force = 1;
	103	sp++;
	104	}
f88395ac JH	105	ep = strchr(sp, ':');
	106	if (ep) {
	107	dp = ep + 1;
	108	*ep = 0;
	109	}
	110	else
	111	dp = sp;
	112	rs[i].src = sp;
	113	rs[i].dst = dp;
	114	}
	115	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	116	return rs;
	117	}
	118
	119	static int count_refspec_match(const char *pattern,
	120	struct ref *refs,
	121	struct ref **matched_ref)
	122	{
	123	int match;
	124	int patlen = strlen(pattern);
	125
	126	for (match = 0; refs; refs = refs->next) {
	127	char *name = refs->name;
	128	int namelen = strlen(name);
	129	if (namelen < patlen \|\|
	130	memcmp(name + namelen - patlen, pattern, patlen))
	131	continue;
	132	if (namelen != patlen && name[namelen - patlen - 1] != '/')
	133	continue;
	134	match++;
	135	*matched_ref = refs;
	136	}
	137	return match;
	138	}
	139
	140	static void link_dst_tail(struct ref ref, struct ref **tail)
	141	{
	142	**tail = ref;
	143	*tail = &ref->next;
	144	**tail = NULL;
	145	}
	146
15e02b37 JH	147	static struct ref try_explicit_object_name(const char name)
	148	{
	149	unsigned char sha1[20];
	150	struct ref *ref;
	151	int len;
	152	if (get_sha1(name, sha1))
	153	return NULL;
	154	len = strlen(name) + 1;
	155	ref = xcalloc(1, sizeof(*ref) + len);
	156	memcpy(ref->name, name, len);
	157	memcpy(ref->new_sha1, sha1, 20);
	158	return ref;
	159	}
	160
f88395ac JH	161	static int match_explicit_refs(struct ref src, struct ref dst,
	162	struct ref **dst_tail, struct refspec rs)
	163	{
	164	int i, errs;
	165	for (i = errs = 0; rs[i].src; i++) {
	166	struct ref matched_src, matched_dst;
	167
	168	matched_src = matched_dst = NULL;
	169	switch (count_refspec_match(rs[i].src, src, &matched_src)) {
	170	case 1:
	171	break;
	172	case 0:
15e02b37 JH	173	/* The source could be in the get_sha1() format
	174	* not a reference name.
	175	*/
	176	matched_src = try_explicit_object_name(rs[i].src);
	177	if (matched_src)
	178	break;
f88395ac	179	errs = 1;
4ec99bf0 TS	180	error("src refspec %s does not match any.",
4ec99bf0 TS	181	rs[i].src);
f88395ac JH	182	break;
	183	default:
	184	errs = 1;
	185	error("src refspec %s matches more than one.",
	186	rs[i].src);
	187	break;
	188	}
	189	switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
	190	case 1:
	191	break;
	192	case 0:
	193	if (!memcmp(rs[i].dst, "refs/", 5)) {
	194	int len = strlen(rs[i].dst) + 1;
	195	matched_dst = xcalloc(1, sizeof(*dst) + len);
	196	memcpy(matched_dst->name, rs[i].dst, len);
	197	link_dst_tail(matched_dst, dst_tail);
	198	}
	199	else if (!strcmp(rs[i].src, rs[i].dst) &&
	200	matched_src) {
	201	/* pushing "master:master" when
	202	* remote does not have master yet.
	203	*/
4fa1604f	204	int len = strlen(matched_src->name) + 1;
f88395ac JH	205	matched_dst = xcalloc(1, sizeof(*dst) + len);
	206	memcpy(matched_dst->name, matched_src->name,
	207	len);
	208	link_dst_tail(matched_dst, dst_tail);
	209	}
	210	else {
	211	errs = 1;
	212	error("dst refspec %s does not match any "
	213	"existing ref on the remote and does "
	214	"not start with refs/.", rs[i].dst);
	215	}
	216	break;
	217	default:
	218	errs = 1;
	219	error("dst refspec %s matches more than one.",
	220	rs[i].dst);
	221	break;
	222	}
	223	if (errs)
	224	continue;
f88395ac JH	225	if (matched_dst->peer_ref) {
	226	errs = 1;
	227	error("dst ref %s receives from more than one src.",
	228	matched_dst->name);
	229	}
ff27adf3	230	else {
f88395ac	231	matched_dst->peer_ref = matched_src;
ff27adf3 JH	232	matched_dst->force = rs[i].force;
ff27adf3 JH	233	}
f88395ac JH	234	}
	235	return -errs;
	236	}
	237
	238	static struct ref find_ref_by_name(struct ref list, const char *name)
	239	{
	240	for ( ; list; list = list->next)
	241	if (!strcmp(list->name, name))
	242	return list;
	243	return NULL;
	244	}
	245
	246	int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
	247	int nr_refspec, char **refspec, int all)
	248	{
	249	struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
	250
	251	if (nr_refspec)
	252	return match_explicit_refs(src, dst, dst_tail, rs);
	253
	254	/* pick the remainder */
	255	for ( ; src; src = src->next) {
	256	struct ref *dst_peer;
	257	if (src->peer_ref)
	258	continue;
	259	dst_peer = find_ref_by_name(dst, src->name);
635d37af	260	if ((dst_peer && dst_peer->peer_ref) \|\| (!dst_peer && !all))
f88395ac JH	261	continue;
f88395ac JH	262	if (!dst_peer) {
f88395ac JH	263	/* Create a new one and link it */
	264	int len = strlen(src->name) + 1;
	265	dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
	266	memcpy(dst_peer->name, src->name, len);
	267	memcpy(dst_peer->new_sha1, src->new_sha1, 20);
	268	link_dst_tail(dst_peer, dst_tail);
	269	}
	270	dst_peer->peer_ref = src;
	271	}
	272	return 0;
	273	}
	274
2386d658 LT	275	enum protocol {
	276	PROTO_LOCAL = 1,
	277	PROTO_SSH,
	278	PROTO_GIT,
	279	};
	280
	281	static enum protocol get_protocol(const char *name)
	282	{
	283	if (!strcmp(name, "ssh"))
	284	return PROTO_SSH;
	285	if (!strcmp(name, "git"))
	286	return PROTO_GIT;
	287	die("I don't handle protocol '%s'", name);
	288	}
	289
5ba88448 YH	290	#define STR_(s) # s
5ba88448 YH	291	#define STR(s) STR_(s)
2386d658	292
49744d63	293	#ifndef NO_IPV6
4c505f71	294
2386d658 LT	295	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
2386d658 LT	296	{
5ba88448 YH	297	int sockfd = -1;
	298	char colon, end;
	299	char *port = STR(DEFAULT_GIT_PORT);
	300	struct addrinfo hints, ai0, ai;
	301	int gai;
	302
	303	if (host[0] == '[') {
	304	end = strchr(host + 1, ']');
	305	if (end) {
	306	*end = 0;
	307	end++;
	308	host++;
	309	} else
	310	end = host;
	311	} else
	312	end = host;
	313	colon = strchr(end, ':');
	314
ce6f8e7e LT	315	if (colon) {
ce6f8e7e LT	316	*colon = 0;
5ba88448	317	port = colon + 1;
ce6f8e7e	318	}
5ba88448 YH	319
	320	memset(&hints, 0, sizeof(hints));
	321	hints.ai_socktype = SOCK_STREAM;
	322	hints.ai_protocol = IPPROTO_TCP;
	323
	324	gai = getaddrinfo(host, port, &hints, &ai);
	325	if (gai)
	326	die("Unable to look up %s (%s)", host, gai_strerror(gai));
	327
	328	for (ai0 = ai; ai; ai = ai->ai_next) {
	329	sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
	330	if (sockfd < 0)
	331	continue;
	332	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
	333	close(sockfd);
	334	sockfd = -1;
	335	continue;
2386d658	336	}
5ba88448	337	break;
2386d658 LT	338	}
2386d658 LT	339
5ba88448	340	freeaddrinfo(ai0);
2386d658	341
2386d658	342	if (sockfd < 0)
5ba88448 YH	343	die("unable to connect a socket (%s)", strerror(errno));
5ba88448 YH	344
2386d658 LT	345	fd[0] = sockfd;
	346	fd[1] = sockfd;
	347	packet_write(sockfd, "%s %s\n", prog, path);
	348	return 0;
	349	}
	350
49744d63	351	#else /* NO_IPV6 */
4c505f71 PA	352
	353	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
	354	{
	355	int sockfd = -1;
	356	char colon, end;
	357	char port = STR(DEFAULT_GIT_PORT), ep;
	358	struct hostent *he;
	359	struct sockaddr_in sa;
	360	char **ap;
	361	unsigned int nport;
	362
	363	if (host[0] == '[') {
	364	end = strchr(host + 1, ']');
	365	if (end) {
	366	*end = 0;
	367	end++;
	368	host++;
	369	} else
	370	end = host;
	371	} else
	372	end = host;
	373	colon = strchr(end, ':');
	374
	375	if (colon) {
	376	*colon = 0;
	377	port = colon + 1;
	378	}
	379
	380
	381	he = gethostbyname(host);
	382	if (!he)
	383	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	384	nport = strtoul(port, &ep, 10);
	385	if ( ep == port \|\| *ep ) {
	386	/* Not numeric */
	387	struct servent *se = getservbyname(port,"tcp");
	388	if ( !se )
	389	die("Unknown port %s\n", port);
	390	nport = se->s_port;
	391	}
	392
	393	for (ap = he->h_addr_list; *ap; ap++) {
	394	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
	395	if (sockfd < 0)
	396	continue;
	397
	398	memset(&sa, 0, sizeof sa);
	399	sa.sin_family = he->h_addrtype;
	400	sa.sin_port = nport;
	401	memcpy(&sa.sin_addr, ap, he->h_length);
	402
	403	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
	404	close(sockfd);
	405	sockfd = -1;
	406	continue;
	407	}
	408	break;
	409	}
	410
	411	if (sockfd < 0)
	412	die("unable to connect a socket (%s)", strerror(errno));
	413
	414	fd[0] = sockfd;
	415	fd[1] = sockfd;
416	packet_write(sockfd, "%s %s\n", prog, path);
417	return 0;
418	}
419
49744d63	420	#endif /* NO_IPV6 */
4c505f71	421
f7192598 LT	422	/*
	423	* Yeah, yeah, fixme. Need to pass in the heads etc.
	424	*/
	425	int git_connect(int fd[2], char url, const char prog)
	426	{
	427	char command[1024];
2386d658	428	char host, path;
f7192598 LT	429	char *colon;
	430	int pipefd[2][2];
	431	pid_t pid;
2386d658	432	enum protocol protocol;
f7192598	433
f7192598 LT	434	host = NULL;
	435	path = url;
	436	colon = strchr(url, ':');
2386d658	437	protocol = PROTO_LOCAL;
f7192598 LT	438	if (colon) {
	439	*colon = 0;
	440	host = url;
	441	path = colon+1;
2386d658 LT	442	protocol = PROTO_SSH;
	443	if (!memcmp(path, "//", 2)) {
	444	char *slash = strchr(path + 2, '/');
	445	if (slash) {
	446	int nr = slash - path - 2;
	447	memmove(path, path+2, nr);
	448	path[nr] = 0;
	449	protocol = get_protocol(url);
	450	host = path;
	451	path = slash;
	452	}
	453	}
f7192598	454	}
2386d658 LT	455
	456	if (protocol == PROTO_GIT)
	457	return git_tcp_connect(fd, prog, host, path);
	458
f7192598 LT	459	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	460	die("unable to create pipe pair for communication");
	461	pid = fork();
	462	if (!pid) {
b10d0ec7 JH	463	snprintf(command, sizeof(command), "%s %s", prog,
b10d0ec7 JH	464	sq_quote(path));
f7192598 LT	465	dup2(pipefd[1][0], 0);
	466	dup2(pipefd[0][1], 1);
	467	close(pipefd[0][0]);
	468	close(pipefd[0][1]);
	469	close(pipefd[1][0]);
	470	close(pipefd[1][1]);
4852f723	471	if (protocol == PROTO_SSH) {
c7c81b3a JR	472	const char ssh, ssh_basename;
	473	ssh = getenv("GIT_SSH");
	474	if (!ssh) ssh = "ssh";
	475	ssh_basename = strrchr(ssh, '/');
4852f723 MS	476	if (!ssh_basename)
	477	ssh_basename = ssh;
	478	else
	479	ssh_basename++;
	480	execlp(ssh, ssh_basename, host, command, NULL);
	481	}
f7192598 LT	482	else
	483	execlp("sh", "sh", "-c", command, NULL);
	484	die("exec failed");
	485	}
	486	fd[0] = pipefd[0][0];
	487	fd[1] = pipefd[1][1];
	488	close(pipefd[0][1]);
	489	close(pipefd[1][0]);
	490	return pid;
	491	}
	492
	493	int finish_connect(pid_t pid)
	494	{
	495	int ret;
	496
	497	for (;;) {
	498	ret = waitpid(pid, NULL, 0);
	499	if (!ret)
	500	break;
	501	if (errno != EINTR)
	502	break;
	503	}
	504	return ret;
	505	}