[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, int ignore_funny)
{
	*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 (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
		    check_ref_format(name + 5))
			continue;

		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;
	if (!strcmp(name, "git+ssh"))
		return PROTO_SSH;
	if (!strcmp(name, "ssh+git"))
		return PROTO_SSH;
	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 = htons(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	*/
1a7141ff JH	13	struct ref get_remote_heads(int in, struct ref list,
1a7141ff JH	14	int nr_match, char **match, int ignore_funny)
d1c133f5 LT	15	{
	16	*list = NULL;
	17	for (;;) {
	18	struct ref *ref;
	19	unsigned char old_sha1[20];
	20	static char buffer[1000];
	21	char *name;
	22	int len;
	23
	24	len = packet_read_line(in, buffer, sizeof(buffer));
	25	if (!len)
	26	break;
	27	if (buffer[len-1] == '\n')
	28	buffer[--len] = 0;
	29
	30	if (len < 42 \|\| get_sha1_hex(buffer, old_sha1) \|\| buffer[40] != ' ')
	31	die("protocol error: expected sha/ref, got '%s'", buffer);
	32	name = buffer + 41;
1a7141ff JH	33
	34	if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
	35	check_ref_format(name + 5))
	36	continue;
	37
d1c133f5 LT	38	if (nr_match && !path_match(name, nr_match, match))
d1c133f5 LT	39	continue;
f88395ac	40	ref = xcalloc(1, sizeof(*ref) + len - 40);
d1c133f5	41	memcpy(ref->old_sha1, old_sha1, 20);
d1c133f5	42	memcpy(ref->name, buffer + 41, len - 40);
d1c133f5 LT	43	*list = ref;
	44	list = &ref->next;
	45	}
	46	return list;
	47	}
	48
41cb7488 LT	49	int get_ack(int fd, unsigned char *result_sha1)
	50	{
	51	static char line[1000];
	52	int len = packet_read_line(fd, line, sizeof(line));
	53
	54	if (!len)
	55	die("git-fetch-pack: expected ACK/NAK, got EOF");
	56	if (line[len-1] == '\n')
	57	line[--len] = 0;
	58	if (!strcmp(line, "NAK"))
	59	return 0;
	60	if (!strncmp(line, "ACK ", 3)) {
	61	if (!get_sha1_hex(line+4, result_sha1))
	62	return 1;
	63	}
	64	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
	65	}
	66
013e7c7f LT	67	int path_match(const char path, int nr, char *match)
	68	{
	69	int i;
	70	int pathlen = strlen(path);
	71
	72	for (i = 0; i < nr; i++) {
	73	char *s = match[i];
	74	int len = strlen(s);
	75
	76	if (!len \|\| len > pathlen)
	77	continue;
	78	if (memcmp(path + pathlen - len, s, len))
	79	continue;
	80	if (pathlen > len && path[pathlen - len - 1] != '/')
	81	continue;
	82	*s = 0;
	83	return 1;
	84	}
	85	return 0;
	86	}
	87
f88395ac JH	88	struct refspec {
	89	char *src;
	90	char *dst;
ff27adf3	91	char force;
f88395ac JH	92	};
f88395ac JH	93
ff27adf3 JH	94	/*
	95	* A:B means fast forward remote B with local A.
	96	* +A:B means overwrite remote B with local A.
	97	* +A is a shorthand for +A:A.
	98	* A is a shorthand for A:A.
	99	*/
f88395ac JH	100	static struct refspec parse_ref_spec(int nr_refspec, char *refspec)
	101	{
	102	int i;
ff27adf3	103	struct refspec rs = xcalloc(sizeof(rs), (nr_refspec + 1));
f88395ac JH	104	for (i = 0; i < nr_refspec; i++) {
	105	char sp, dp, *ep;
	106	sp = refspec[i];
ff27adf3 JH	107	if (*sp == '+') {
	108	rs[i].force = 1;
	109	sp++;
	110	}
f88395ac JH	111	ep = strchr(sp, ':');
	112	if (ep) {
	113	dp = ep + 1;
	114	*ep = 0;
	115	}
	116	else
	117	dp = sp;
	118	rs[i].src = sp;
	119	rs[i].dst = dp;
	120	}
	121	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	122	return rs;
	123	}
	124
	125	static int count_refspec_match(const char *pattern,
	126	struct ref *refs,
	127	struct ref **matched_ref)
	128	{
	129	int match;
	130	int patlen = strlen(pattern);
	131
	132	for (match = 0; refs; refs = refs->next) {
	133	char *name = refs->name;
	134	int namelen = strlen(name);
	135	if (namelen < patlen \|\|
	136	memcmp(name + namelen - patlen, pattern, patlen))
	137	continue;
	138	if (namelen != patlen && name[namelen - patlen - 1] != '/')
	139	continue;
	140	match++;
	141	*matched_ref = refs;
	142	}
	143	return match;
	144	}
	145
	146	static void link_dst_tail(struct ref ref, struct ref **tail)
	147	{
	148	**tail = ref;
	149	*tail = &ref->next;
	150	**tail = NULL;
	151	}
	152
15e02b37 JH	153	static struct ref try_explicit_object_name(const char name)
	154	{
	155	unsigned char sha1[20];
	156	struct ref *ref;
	157	int len;
	158	if (get_sha1(name, sha1))
	159	return NULL;
	160	len = strlen(name) + 1;
	161	ref = xcalloc(1, sizeof(*ref) + len);
	162	memcpy(ref->name, name, len);
	163	memcpy(ref->new_sha1, sha1, 20);
	164	return ref;
	165	}
	166
f88395ac JH	167	static int match_explicit_refs(struct ref src, struct ref dst,
	168	struct ref **dst_tail, struct refspec rs)
	169	{
	170	int i, errs;
	171	for (i = errs = 0; rs[i].src; i++) {
	172	struct ref matched_src, matched_dst;
	173
	174	matched_src = matched_dst = NULL;
	175	switch (count_refspec_match(rs[i].src, src, &matched_src)) {
	176	case 1:
	177	break;
	178	case 0:
15e02b37 JH	179	/* The source could be in the get_sha1() format
	180	* not a reference name.
	181	*/
	182	matched_src = try_explicit_object_name(rs[i].src);
	183	if (matched_src)
	184	break;
f88395ac	185	errs = 1;
4ec99bf0 TS	186	error("src refspec %s does not match any.",
4ec99bf0 TS	187	rs[i].src);
f88395ac JH	188	break;
	189	default:
	190	errs = 1;
	191	error("src refspec %s matches more than one.",
	192	rs[i].src);
	193	break;
	194	}
	195	switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
	196	case 1:
	197	break;
	198	case 0:
	199	if (!memcmp(rs[i].dst, "refs/", 5)) {
	200	int len = strlen(rs[i].dst) + 1;
	201	matched_dst = xcalloc(1, sizeof(*dst) + len);
	202	memcpy(matched_dst->name, rs[i].dst, len);
	203	link_dst_tail(matched_dst, dst_tail);
	204	}
	205	else if (!strcmp(rs[i].src, rs[i].dst) &&
	206	matched_src) {
	207	/* pushing "master:master" when
	208	* remote does not have master yet.
	209	*/
4fa1604f	210	int len = strlen(matched_src->name) + 1;
f88395ac JH	211	matched_dst = xcalloc(1, sizeof(*dst) + len);
	212	memcpy(matched_dst->name, matched_src->name,
	213	len);
	214	link_dst_tail(matched_dst, dst_tail);
	215	}
	216	else {
	217	errs = 1;
	218	error("dst refspec %s does not match any "
	219	"existing ref on the remote and does "
	220	"not start with refs/.", rs[i].dst);
	221	}
	222	break;
	223	default:
	224	errs = 1;
	225	error("dst refspec %s matches more than one.",
	226	rs[i].dst);
	227	break;
	228	}
	229	if (errs)
	230	continue;
f88395ac JH	231	if (matched_dst->peer_ref) {
	232	errs = 1;
	233	error("dst ref %s receives from more than one src.",
	234	matched_dst->name);
	235	}
ff27adf3	236	else {
f88395ac	237	matched_dst->peer_ref = matched_src;
ff27adf3 JH	238	matched_dst->force = rs[i].force;
ff27adf3 JH	239	}
f88395ac JH	240	}
	241	return -errs;
	242	}
	243
	244	static struct ref find_ref_by_name(struct ref list, const char *name)
	245	{
	246	for ( ; list; list = list->next)
	247	if (!strcmp(list->name, name))
	248	return list;
	249	return NULL;
	250	}
	251
	252	int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
	253	int nr_refspec, char **refspec, int all)
	254	{
	255	struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
	256
	257	if (nr_refspec)
	258	return match_explicit_refs(src, dst, dst_tail, rs);
	259
	260	/* pick the remainder */
	261	for ( ; src; src = src->next) {
	262	struct ref *dst_peer;
	263	if (src->peer_ref)
	264	continue;
	265	dst_peer = find_ref_by_name(dst, src->name);
635d37af	266	if ((dst_peer && dst_peer->peer_ref) \|\| (!dst_peer && !all))
f88395ac JH	267	continue;
f88395ac JH	268	if (!dst_peer) {
f88395ac JH	269	/* Create a new one and link it */
	270	int len = strlen(src->name) + 1;
	271	dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
	272	memcpy(dst_peer->name, src->name, len);
	273	memcpy(dst_peer->new_sha1, src->new_sha1, 20);
	274	link_dst_tail(dst_peer, dst_tail);
	275	}
	276	dst_peer->peer_ref = src;
	277	}
	278	return 0;
	279	}
	280
2386d658 LT	281	enum protocol {
	282	PROTO_LOCAL = 1,
	283	PROTO_SSH,
	284	PROTO_GIT,
	285	};
	286
	287	static enum protocol get_protocol(const char *name)
	288	{
	289	if (!strcmp(name, "ssh"))
	290	return PROTO_SSH;
	291	if (!strcmp(name, "git"))
	292	return PROTO_GIT;
c05186cc LT	293	if (!strcmp(name, "git+ssh"))
	294	return PROTO_SSH;
	295	if (!strcmp(name, "ssh+git"))
	296	return PROTO_SSH;
2386d658 LT	297	die("I don't handle protocol '%s'", name);
	298	}
	299
5ba88448 YH	300	#define STR_(s) # s
5ba88448 YH	301	#define STR(s) STR_(s)
2386d658	302
49744d63	303	#ifndef NO_IPV6
4c505f71	304
2386d658 LT	305	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
2386d658 LT	306	{
5ba88448 YH	307	int sockfd = -1;
	308	char colon, end;
	309	char *port = STR(DEFAULT_GIT_PORT);
	310	struct addrinfo hints, ai0, ai;
	311	int gai;
	312
	313	if (host[0] == '[') {
	314	end = strchr(host + 1, ']');
	315	if (end) {
	316	*end = 0;
	317	end++;
	318	host++;
	319	} else
	320	end = host;
	321	} else
	322	end = host;
	323	colon = strchr(end, ':');
	324
ce6f8e7e LT	325	if (colon) {
ce6f8e7e LT	326	*colon = 0;
5ba88448	327	port = colon + 1;
ce6f8e7e	328	}
5ba88448 YH	329
	330	memset(&hints, 0, sizeof(hints));
	331	hints.ai_socktype = SOCK_STREAM;
	332	hints.ai_protocol = IPPROTO_TCP;
	333
	334	gai = getaddrinfo(host, port, &hints, &ai);
	335	if (gai)
	336	die("Unable to look up %s (%s)", host, gai_strerror(gai));
	337
	338	for (ai0 = ai; ai; ai = ai->ai_next) {
	339	sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
	340	if (sockfd < 0)
	341	continue;
	342	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
	343	close(sockfd);
	344	sockfd = -1;
	345	continue;
2386d658	346	}
5ba88448	347	break;
2386d658 LT	348	}
2386d658 LT	349
5ba88448	350	freeaddrinfo(ai0);
2386d658	351
2386d658	352	if (sockfd < 0)
5ba88448 YH	353	die("unable to connect a socket (%s)", strerror(errno));
5ba88448 YH	354
2386d658 LT	355	fd[0] = sockfd;
	356	fd[1] = sockfd;
	357	packet_write(sockfd, "%s %s\n", prog, path);
	358	return 0;
	359	}
	360
49744d63	361	#else /* NO_IPV6 */
4c505f71 PA	362
	363	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
	364	{
	365	int sockfd = -1;
	366	char colon, end;
	367	char port = STR(DEFAULT_GIT_PORT), ep;
	368	struct hostent *he;
	369	struct sockaddr_in sa;
	370	char **ap;
	371	unsigned int nport;
	372
	373	if (host[0] == '[') {
	374	end = strchr(host + 1, ']');
	375	if (end) {
	376	*end = 0;
	377	end++;
	378	host++;
	379	} else
	380	end = host;
	381	} else
	382	end = host;
	383	colon = strchr(end, ':');
	384
	385	if (colon) {
	386	*colon = 0;
	387	port = colon + 1;
	388	}
	389
	390
	391	he = gethostbyname(host);
	392	if (!he)
	393	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	394	nport = strtoul(port, &ep, 10);
	395	if ( ep == port \|\| *ep ) {
	396	/* Not numeric */
	397	struct servent *se = getservbyname(port,"tcp");
	398	if ( !se )
	399	die("Unknown port %s\n", port);
	400	nport = se->s_port;
	401	}
	402
	403	for (ap = he->h_addr_list; *ap; ap++) {
	404	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
	405	if (sockfd < 0)
	406	continue;
	407
	408	memset(&sa, 0, sizeof sa);
	409	sa.sin_family = he->h_addrtype;
6573faff	410	sa.sin_port = htons(nport);
4c505f71 PA	411	memcpy(&sa.sin_addr, ap, he->h_length);
	412
	413	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
	414	close(sockfd);
	415	sockfd = -1;
	416	continue;
	417	}
	418	break;
	419	}
	420
	421	if (sockfd < 0)
	422	die("unable to connect a socket (%s)", strerror(errno));
	423
	424	fd[0] = sockfd;
	425	fd[1] = sockfd;
	426	packet_write(sockfd, "%s %s\n", prog, path);
	427	return 0;
	428	}
	429
49744d63	430	#endif /* NO_IPV6 */
4c505f71	431
f7192598 LT	432	/*
	433	* Yeah, yeah, fixme. Need to pass in the heads etc.
	434	*/
	435	int git_connect(int fd[2], char url, const char prog)
	436	{
	437	char command[1024];
2386d658	438	char host, path;
f7192598 LT	439	char *colon;
	440	int pipefd[2][2];
	441	pid_t pid;
2386d658	442	enum protocol protocol;
f7192598	443
f7192598 LT	444	host = NULL;
	445	path = url;
	446	colon = strchr(url, ':');
2386d658	447	protocol = PROTO_LOCAL;
f7192598 LT	448	if (colon) {
	449	*colon = 0;
	450	host = url;
	451	path = colon+1;
2386d658 LT	452	protocol = PROTO_SSH;
	453	if (!memcmp(path, "//", 2)) {
	454	char *slash = strchr(path + 2, '/');
	455	if (slash) {
	456	int nr = slash - path - 2;
	457	memmove(path, path+2, nr);
	458	path[nr] = 0;
	459	protocol = get_protocol(url);
	460	host = path;
	461	path = slash;
	462	}
	463	}
f7192598	464	}
2386d658 LT	465
	466	if (protocol == PROTO_GIT)
	467	return git_tcp_connect(fd, prog, host, path);
	468
f7192598 LT	469	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	470	die("unable to create pipe pair for communication");
	471	pid = fork();
	472	if (!pid) {
b10d0ec7 JH	473	snprintf(command, sizeof(command), "%s %s", prog,
b10d0ec7 JH	474	sq_quote(path));
f7192598 LT	475	dup2(pipefd[1][0], 0);
	476	dup2(pipefd[0][1], 1);
	477	close(pipefd[0][0]);
	478	close(pipefd[0][1]);
	479	close(pipefd[1][0]);
	480	close(pipefd[1][1]);
4852f723	481	if (protocol == PROTO_SSH) {
c7c81b3a JR	482	const char ssh, ssh_basename;
	483	ssh = getenv("GIT_SSH");
	484	if (!ssh) ssh = "ssh";
	485	ssh_basename = strrchr(ssh, '/');
4852f723 MS	486	if (!ssh_basename)
	487	ssh_basename = ssh;
	488	else
	489	ssh_basename++;
	490	execlp(ssh, ssh_basename, host, command, NULL);
	491	}
f7192598 LT	492	else
	493	execlp("sh", "sh", "-c", command, NULL);
	494	die("exec failed");
	495	}
	496	fd[0] = pipefd[0][0];
	497	fd[1] = pipefd[1][1];
	498	close(pipefd[0][1]);
	499	close(pipefd[1][0]);
	500	return pid;
	501	}
	502
	503	int finish_connect(pid_t pid)
	504	{
	505	int ret;
	506
	507	for (;;) {
	508	ret = waitpid(pid, NULL, 0);
	509	if (!ret)
	510	break;
	511	if (errno != EINTR)
	512	break;
	513	}
	514	return ret;
	515	}