[thirdparty/git.git] / connect.c

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

static char *server_capabilities = NULL;

/*
 * 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, name_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;

		name_len = strlen(name);
		if (len != name_len + 41) {
			if (server_capabilities)
				free(server_capabilities);
			server_capabilities = strdup(name + name_len + 1);
		}

		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 server_supports(const char *feature)
{
	return server_capabilities &&
		strstr(server_capabilities, feature) != NULL;
}

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)) {
			if (strstr(line+45, "continue"))
				return 2;
			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 */

static char *git_proxy_command = NULL;
static const char *rhost_name = NULL;
static int rhost_len;

static int git_proxy_command_options(const char *var, const char *value)
{
	if (!strcmp(var, "core.gitproxy")) {
		const char *for_pos;
		int matchlen = -1;
		int hostlen;

		if (git_proxy_command)
			return 0;
		/* [core]
		 * ;# matches www.kernel.org as well
		 * gitproxy = netcatter-1 for kernel.org
		 * gitproxy = netcatter-2 for sample.xz
		 * gitproxy = netcatter-default
		 */
		for_pos = strstr(value, " for ");
		if (!for_pos)
			/* matches everybody */
			matchlen = strlen(value);
		else {
			hostlen = strlen(for_pos + 5);
			if (rhost_len < hostlen)
				matchlen = -1;
			else if (!strncmp(for_pos + 5,
					  rhost_name + rhost_len - hostlen,
					  hostlen) &&
				 ((rhost_len == hostlen) ||
				  rhost_name[rhost_len - hostlen -1] == '.'))
				matchlen = for_pos - value;
			else
				matchlen = -1;
		}
		if (0 <= matchlen) {
			/* core.gitproxy = none for kernel.org */
			if (matchlen == 4 && 
			    !memcmp(value, "none", 4))
				matchlen = 0;
			git_proxy_command = xmalloc(matchlen + 1);
			memcpy(git_proxy_command, value, matchlen);
			git_proxy_command[matchlen] = 0;
		}
		return 0;
	}

	return git_default_config(var, value);
}

static int git_use_proxy(const char *host)
{
	rhost_name = host;
	rhost_len = strlen(host);
	git_proxy_command = getenv("GIT_PROXY_COMMAND");
	git_config(git_proxy_command_options);
	rhost_name = NULL;
	return (git_proxy_command && *git_proxy_command);
}

static int git_proxy_connect(int fd[2], const char *prog, char *host, char *path)
{
	char *port = STR(DEFAULT_GIT_PORT);
	char *colon, *end;
	int pipefd[2][2];
	pid_t pid;

	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;
	}

	if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
		die("unable to create pipe pair for communication");
	pid = fork();
	if (!pid) {
		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]);
		execlp(git_proxy_command, git_proxy_command, host, port, NULL);
		die("exec failed");
	}
	fd[0] = pipefd[0][0];
	fd[1] = pipefd[1][1];
	close(pipefd[0][1]);
	close(pipefd[1][0]);
	packet_write(fd[1], "%s %s\n", prog, path);
	return pid;
}

/*
 * 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 = url;
	char *end;
	int c;
	int pipefd[2][2];
	pid_t pid;
	enum protocol protocol = PROTO_LOCAL;

	host = strstr(url, "://");
	if(host) {
		*host = '\0';
		protocol = get_protocol(url);
		host += 3;
		c = '/';
	} else {
		host = url;
		c = ':';
	}

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

	path = strchr(end, c);
	if (c == ':') {
		if (path) {
			protocol = PROTO_SSH;
			*path++ = '\0';
		} else
			path = host;
	}

	if (!path || !*path)
		die("No path specified. See 'man git-pull' for valid url syntax");

	/*
	 * null-terminate hostname and point path to ~ for URL's like this:
	 *    ssh://host.xz/~user/repo
	 */
	if (protocol != PROTO_LOCAL && host != url) {
		char *ptr = path;
		if (path[1] == '~')
			path++;
		else
			path = strdup(ptr);

		*ptr = '\0';
	}

	if (protocol == PROTO_GIT) {
		if (git_use_proxy(host))
			return git_proxy_connect(fd, prog, host, path);
		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 {
			unsetenv(ALTERNATE_DB_ENVIRONMENT);
			unsetenv(DB_ENVIRONMENT);
			unsetenv(GIT_DIR_ENVIRONMENT);
			unsetenv(GRAFT_ENVIRONMENT);
			unsetenv(INDEX_ENVIRONMENT);
			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
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"
f7192598	6	#include <sys/wait.h>
2386d658 LT	7	#include <sys/socket.h>
	8	#include <netinet/in.h>
	9	#include <arpa/inet.h>
	10	#include <netdb.h>
f7192598	11
1f5881bb	12	static char *server_capabilities = NULL;
211b5f9e	13
d1c133f5 LT	14	/*
	15	* Read all the refs from the other end
	16	*/
1a7141ff JH	17	struct ref get_remote_heads(int in, struct ref list,
1a7141ff JH	18	int nr_match, char **match, int ignore_funny)
d1c133f5 LT	19	{
	20	*list = NULL;
	21	for (;;) {
	22	struct ref *ref;
	23	unsigned char old_sha1[20];
	24	static char buffer[1000];
	25	char *name;
211b5f9e	26	int len, name_len;
d1c133f5 LT	27
	28	len = packet_read_line(in, buffer, sizeof(buffer));
	29	if (!len)
	30	break;
	31	if (buffer[len-1] == '\n')
	32	buffer[--len] = 0;
	33
	34	if (len < 42 \|\| get_sha1_hex(buffer, old_sha1) \|\| buffer[40] != ' ')
	35	die("protocol error: expected sha/ref, got '%s'", buffer);
	36	name = buffer + 41;
1a7141ff	37
211b5f9e JS	38	name_len = strlen(name);
	39	if (len != name_len + 41) {
	40	if (server_capabilities)
	41	free(server_capabilities);
	42	server_capabilities = strdup(name + name_len + 1);
	43	}
	44
cfee10a7 JH	45	if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
	46	check_ref_format(name + 5))
	47	continue;
	48
d1c133f5 LT	49	if (nr_match && !path_match(name, nr_match, match))
d1c133f5 LT	50	continue;
f88395ac	51	ref = xcalloc(1, sizeof(*ref) + len - 40);
d1c133f5	52	memcpy(ref->old_sha1, old_sha1, 20);
d1c133f5	53	memcpy(ref->name, buffer + 41, len - 40);
d1c133f5 LT	54	*list = ref;
	55	list = &ref->next;
	56	}
	57	return list;
	58	}
	59
211b5f9e JS	60	int server_supports(const char *feature)
211b5f9e JS	61	{
1f5881bb JS	62	return server_capabilities &&
1f5881bb JS	63	strstr(server_capabilities, feature) != NULL;
211b5f9e JS	64	}
211b5f9e JS	65
41cb7488 LT	66	int get_ack(int fd, unsigned char *result_sha1)
	67	{
	68	static char line[1000];
	69	int len = packet_read_line(fd, line, sizeof(line));
	70
	71	if (!len)
	72	die("git-fetch-pack: expected ACK/NAK, got EOF");
	73	if (line[len-1] == '\n')
	74	line[--len] = 0;
	75	if (!strcmp(line, "NAK"))
	76	return 0;
	77	if (!strncmp(line, "ACK ", 3)) {
c4c86f07 JS	78	if (!get_sha1_hex(line+4, result_sha1)) {
	79	if (strstr(line+45, "continue"))
	80	return 2;
41cb7488	81	return 1;
c4c86f07	82	}
41cb7488 LT	83	}
	84	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
	85	}
	86
013e7c7f LT	87	int path_match(const char path, int nr, char *match)
	88	{
	89	int i;
	90	int pathlen = strlen(path);
	91
	92	for (i = 0; i < nr; i++) {
	93	char *s = match[i];
	94	int len = strlen(s);
	95
	96	if (!len \|\| len > pathlen)
	97	continue;
	98	if (memcmp(path + pathlen - len, s, len))
	99	continue;
	100	if (pathlen > len && path[pathlen - len - 1] != '/')
	101	continue;
	102	*s = 0;
	103	return 1;
	104	}
	105	return 0;
	106	}
	107
f88395ac JH	108	struct refspec {
	109	char *src;
	110	char *dst;
ff27adf3	111	char force;
f88395ac JH	112	};
f88395ac JH	113
ff27adf3 JH	114	/*
	115	* A:B means fast forward remote B with local A.
	116	* +A:B means overwrite remote B with local A.
	117	* +A is a shorthand for +A:A.
	118	* A is a shorthand for A:A.
	119	*/
f88395ac JH	120	static struct refspec parse_ref_spec(int nr_refspec, char *refspec)
	121	{
	122	int i;
ff27adf3	123	struct refspec rs = xcalloc(sizeof(rs), (nr_refspec + 1));
f88395ac JH	124	for (i = 0; i < nr_refspec; i++) {
	125	char sp, dp, *ep;
	126	sp = refspec[i];
ff27adf3 JH	127	if (*sp == '+') {
	128	rs[i].force = 1;
	129	sp++;
	130	}
f88395ac JH	131	ep = strchr(sp, ':');
	132	if (ep) {
	133	dp = ep + 1;
	134	*ep = 0;
	135	}
	136	else
	137	dp = sp;
	138	rs[i].src = sp;
	139	rs[i].dst = dp;
	140	}
	141	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	142	return rs;
	143	}
	144
	145	static int count_refspec_match(const char *pattern,
	146	struct ref *refs,
	147	struct ref **matched_ref)
	148	{
	149	int match;
	150	int patlen = strlen(pattern);
	151
	152	for (match = 0; refs; refs = refs->next) {
	153	char *name = refs->name;
	154	int namelen = strlen(name);
	155	if (namelen < patlen \|\|
	156	memcmp(name + namelen - patlen, pattern, patlen))
	157	continue;
	158	if (namelen != patlen && name[namelen - patlen - 1] != '/')
	159	continue;
	160	match++;
	161	*matched_ref = refs;
	162	}
	163	return match;
	164	}
	165
	166	static void link_dst_tail(struct ref ref, struct ref **tail)
	167	{
	168	**tail = ref;
	169	*tail = &ref->next;
	170	**tail = NULL;
	171	}
	172
15e02b37 JH	173	static struct ref try_explicit_object_name(const char name)
	174	{
	175	unsigned char sha1[20];
	176	struct ref *ref;
	177	int len;
	178	if (get_sha1(name, sha1))
	179	return NULL;
	180	len = strlen(name) + 1;
	181	ref = xcalloc(1, sizeof(*ref) + len);
	182	memcpy(ref->name, name, len);
	183	memcpy(ref->new_sha1, sha1, 20);
	184	return ref;
	185	}
	186
f88395ac JH	187	static int match_explicit_refs(struct ref src, struct ref dst,
	188	struct ref **dst_tail, struct refspec rs)
	189	{
	190	int i, errs;
	191	for (i = errs = 0; rs[i].src; i++) {
	192	struct ref matched_src, matched_dst;
	193
	194	matched_src = matched_dst = NULL;
	195	switch (count_refspec_match(rs[i].src, src, &matched_src)) {
	196	case 1:
	197	break;
	198	case 0:
15e02b37 JH	199	/* The source could be in the get_sha1() format
	200	* not a reference name.
	201	*/
	202	matched_src = try_explicit_object_name(rs[i].src);
	203	if (matched_src)
	204	break;
f88395ac	205	errs = 1;
4ec99bf0 TS	206	error("src refspec %s does not match any.",
4ec99bf0 TS	207	rs[i].src);
f88395ac JH	208	break;
	209	default:
	210	errs = 1;
	211	error("src refspec %s matches more than one.",
	212	rs[i].src);
	213	break;
	214	}
	215	switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
	216	case 1:
	217	break;
	218	case 0:
	219	if (!memcmp(rs[i].dst, "refs/", 5)) {
	220	int len = strlen(rs[i].dst) + 1;
	221	matched_dst = xcalloc(1, sizeof(*dst) + len);
	222	memcpy(matched_dst->name, rs[i].dst, len);
	223	link_dst_tail(matched_dst, dst_tail);
	224	}
	225	else if (!strcmp(rs[i].src, rs[i].dst) &&
	226	matched_src) {
	227	/* pushing "master:master" when
	228	* remote does not have master yet.
	229	*/
4fa1604f	230	int len = strlen(matched_src->name) + 1;
f88395ac JH	231	matched_dst = xcalloc(1, sizeof(*dst) + len);
	232	memcpy(matched_dst->name, matched_src->name,
	233	len);
	234	link_dst_tail(matched_dst, dst_tail);
	235	}
	236	else {
	237	errs = 1;
	238	error("dst refspec %s does not match any "
	239	"existing ref on the remote and does "
	240	"not start with refs/.", rs[i].dst);
	241	}
	242	break;
	243	default:
	244	errs = 1;
	245	error("dst refspec %s matches more than one.",
	246	rs[i].dst);
	247	break;
	248	}
	249	if (errs)
	250	continue;
f88395ac JH	251	if (matched_dst->peer_ref) {
	252	errs = 1;
	253	error("dst ref %s receives from more than one src.",
	254	matched_dst->name);
	255	}
ff27adf3	256	else {
f88395ac	257	matched_dst->peer_ref = matched_src;
ff27adf3 JH	258	matched_dst->force = rs[i].force;
ff27adf3 JH	259	}
f88395ac JH	260	}
	261	return -errs;
	262	}
	263
	264	static struct ref find_ref_by_name(struct ref list, const char *name)
	265	{
	266	for ( ; list; list = list->next)
	267	if (!strcmp(list->name, name))
	268	return list;
	269	return NULL;
	270	}
	271
	272	int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
	273	int nr_refspec, char **refspec, int all)
	274	{
	275	struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
	276
	277	if (nr_refspec)
	278	return match_explicit_refs(src, dst, dst_tail, rs);
	279
	280	/* pick the remainder */
	281	for ( ; src; src = src->next) {
	282	struct ref *dst_peer;
	283	if (src->peer_ref)
	284	continue;
	285	dst_peer = find_ref_by_name(dst, src->name);
635d37af	286	if ((dst_peer && dst_peer->peer_ref) \|\| (!dst_peer && !all))
f88395ac JH	287	continue;
f88395ac JH	288	if (!dst_peer) {
f88395ac JH	289	/* Create a new one and link it */
	290	int len = strlen(src->name) + 1;
	291	dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
	292	memcpy(dst_peer->name, src->name, len);
	293	memcpy(dst_peer->new_sha1, src->new_sha1, 20);
	294	link_dst_tail(dst_peer, dst_tail);
	295	}
	296	dst_peer->peer_ref = src;
	297	}
	298	return 0;
	299	}
	300
2386d658 LT	301	enum protocol {
	302	PROTO_LOCAL = 1,
	303	PROTO_SSH,
	304	PROTO_GIT,
	305	};
	306
	307	static enum protocol get_protocol(const char *name)
	308	{
	309	if (!strcmp(name, "ssh"))
	310	return PROTO_SSH;
	311	if (!strcmp(name, "git"))
	312	return PROTO_GIT;
c05186cc LT	313	if (!strcmp(name, "git+ssh"))
	314	return PROTO_SSH;
	315	if (!strcmp(name, "ssh+git"))
	316	return PROTO_SSH;
2386d658 LT	317	die("I don't handle protocol '%s'", name);
	318	}
	319
5ba88448 YH	320	#define STR_(s) # s
5ba88448 YH	321	#define STR(s) STR_(s)
2386d658	322
49744d63	323	#ifndef NO_IPV6
4c505f71	324
2386d658 LT	325	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
2386d658 LT	326	{
5ba88448 YH	327	int sockfd = -1;
	328	char colon, end;
	329	char *port = STR(DEFAULT_GIT_PORT);
	330	struct addrinfo hints, ai0, ai;
	331	int gai;
	332
	333	if (host[0] == '[') {
	334	end = strchr(host + 1, ']');
	335	if (end) {
	336	*end = 0;
	337	end++;
	338	host++;
	339	} else
	340	end = host;
	341	} else
	342	end = host;
	343	colon = strchr(end, ':');
	344
ce6f8e7e LT	345	if (colon) {
ce6f8e7e LT	346	*colon = 0;
5ba88448	347	port = colon + 1;
ce6f8e7e	348	}
5ba88448 YH	349
	350	memset(&hints, 0, sizeof(hints));
	351	hints.ai_socktype = SOCK_STREAM;
	352	hints.ai_protocol = IPPROTO_TCP;
	353
	354	gai = getaddrinfo(host, port, &hints, &ai);
	355	if (gai)
	356	die("Unable to look up %s (%s)", host, gai_strerror(gai));
	357
	358	for (ai0 = ai; ai; ai = ai->ai_next) {
	359	sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
	360	if (sockfd < 0)
	361	continue;
	362	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
	363	close(sockfd);
	364	sockfd = -1;
	365	continue;
2386d658	366	}
5ba88448	367	break;
2386d658 LT	368	}
2386d658 LT	369
5ba88448	370	freeaddrinfo(ai0);
2386d658	371
2386d658	372	if (sockfd < 0)
5ba88448 YH	373	die("unable to connect a socket (%s)", strerror(errno));
5ba88448 YH	374
2386d658 LT	375	fd[0] = sockfd;
	376	fd[1] = sockfd;
	377	packet_write(sockfd, "%s %s\n", prog, path);
	378	return 0;
	379	}
	380
49744d63	381	#else /* NO_IPV6 */
4c505f71 PA	382
	383	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
	384	{
	385	int sockfd = -1;
	386	char colon, end;
	387	char port = STR(DEFAULT_GIT_PORT), ep;
	388	struct hostent *he;
	389	struct sockaddr_in sa;
	390	char **ap;
	391	unsigned int nport;
	392
	393	if (host[0] == '[') {
	394	end = strchr(host + 1, ']');
	395	if (end) {
	396	*end = 0;
	397	end++;
	398	host++;
	399	} else
	400	end = host;
	401	} else
	402	end = host;
	403	colon = strchr(end, ':');
	404
	405	if (colon) {
	406	*colon = 0;
	407	port = colon + 1;
	408	}
	409
	410
	411	he = gethostbyname(host);
	412	if (!he)
	413	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	414	nport = strtoul(port, &ep, 10);
	415	if ( ep == port \|\| *ep ) {
	416	/* Not numeric */
	417	struct servent *se = getservbyname(port,"tcp");
	418	if ( !se )
	419	die("Unknown port %s\n", port);
	420	nport = se->s_port;
	421	}
	422
	423	for (ap = he->h_addr_list; *ap; ap++) {
	424	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
	425	if (sockfd < 0)
	426	continue;
	427
	428	memset(&sa, 0, sizeof sa);
	429	sa.sin_family = he->h_addrtype;
6573faff	430	sa.sin_port = htons(nport);
c6164218	431	memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 PA	432
	433	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
	434	close(sockfd);
	435	sockfd = -1;
	436	continue;
	437	}
	438	break;
	439	}
	440
	441	if (sockfd < 0)
	442	die("unable to connect a socket (%s)", strerror(errno));
	443
	444	fd[0] = sockfd;
	445	fd[1] = sockfd;
	446	packet_write(sockfd, "%s %s\n", prog, path);
	447	return 0;
	448	}
	449
49744d63	450	#endif /* NO_IPV6 */
4c505f71	451
f8014776	452	static char *git_proxy_command = NULL;
e814bc4d JH	453	static const char *rhost_name = NULL;
e814bc4d JH	454	static int rhost_len;
f8014776 PC	455
	456	static int git_proxy_command_options(const char var, const char value)
	457	{
e814bc4d	458	if (!strcmp(var, "core.gitproxy")) {
c3df8568 YH	459	const char *for_pos;
	460	int matchlen = -1;
	461	int hostlen;
	462
e814bc4d	463	if (git_proxy_command)
f8014776	464	return 0;
e814bc4d JH	465	/* [core]
	466	* ;# matches www.kernel.org as well
	467	* gitproxy = netcatter-1 for kernel.org
	468	* gitproxy = netcatter-2 for sample.xz
	469	* gitproxy = netcatter-default
	470	*/
c3df8568	471	for_pos = strstr(value, " for ");
e814bc4d JH	472	if (!for_pos)
	473	/* matches everybody */
	474	matchlen = strlen(value);
	475	else {
	476	hostlen = strlen(for_pos + 5);
	477	if (rhost_len < hostlen)
	478	matchlen = -1;
	479	else if (!strncmp(for_pos + 5,
	480	rhost_name + rhost_len - hostlen,
	481	hostlen) &&
	482	((rhost_len == hostlen) \|\|
	483	rhost_name[rhost_len - hostlen -1] == '.'))
	484	matchlen = for_pos - value;
	485	else
	486	matchlen = -1;
	487	}
	488	if (0 <= matchlen) {
	489	/* core.gitproxy = none for kernel.org */
	490	if (matchlen == 4 &&
	491	!memcmp(value, "none", 4))
	492	matchlen = 0;
	493	git_proxy_command = xmalloc(matchlen + 1);
	494	memcpy(git_proxy_command, value, matchlen);
	495	git_proxy_command[matchlen] = 0;
f8014776	496	}
e814bc4d	497	return 0;
f8014776 PC	498	}
	499
	500	return git_default_config(var, value);
	501	}
	502
e814bc4d	503	static int git_use_proxy(const char *host)
f8014776	504	{
e814bc4d JH	505	rhost_name = host;
e814bc4d JH	506	rhost_len = strlen(host);
f8014776 PC	507	git_proxy_command = getenv("GIT_PROXY_COMMAND");
f8014776 PC	508	git_config(git_proxy_command_options);
e814bc4d JH	509	rhost_name = NULL;
e814bc4d JH	510	return (git_proxy_command && *git_proxy_command);
f8014776 PC	511	}
	512
	513	static int git_proxy_connect(int fd[2], const char prog, char host, char *path)
	514	{
	515	char *port = STR(DEFAULT_GIT_PORT);
	516	char colon, end;
	517	int pipefd[2][2];
	518	pid_t pid;
	519
	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;
	530	colon = strchr(end, ':');
	531
	532	if (colon) {
	533	*colon = 0;
	534	port = colon + 1;
	535	}
	536
	537	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	538	die("unable to create pipe pair for communication");
	539	pid = fork();
	540	if (!pid) {
	541	dup2(pipefd[1][0], 0);
	542	dup2(pipefd[0][1], 1);
	543	close(pipefd[0][0]);
	544	close(pipefd[0][1]);
	545	close(pipefd[1][0]);
	546	close(pipefd[1][1]);
	547	execlp(git_proxy_command, git_proxy_command, host, port, NULL);
	548	die("exec failed");
	549	}
	550	fd[0] = pipefd[0][0];
	551	fd[1] = pipefd[1][1];
	552	close(pipefd[0][1]);
	553	close(pipefd[1][0]);
	554	packet_write(fd[1], "%s %s\n", prog, path);
	555	return pid;
	556	}
	557
f7192598 LT	558	/*
	559	* Yeah, yeah, fixme. Need to pass in the heads etc.
	560	*/
	561	int git_connect(int fd[2], char url, const char prog)
	562	{
	563	char command[1024];
faea9ccb	564	char host, path = url;
356bece0 YH	565	char *end;
356bece0 YH	566	int c;
f7192598 LT	567	int pipefd[2][2];
f7192598 LT	568	pid_t pid;
faea9ccb AE	569	enum protocol protocol = PROTO_LOCAL;
	570
	571	host = strstr(url, "://");
	572	if(host) {
	573	*host = '\0';
	574	protocol = get_protocol(url);
	575	host += 3;
356bece0 YH	576	c = '/';
356bece0 YH	577	} else {
f7192598	578	host = url;
356bece0 YH	579	c = ':';
	580	}
	581
	582	if (host[0] == '[') {
	583	end = strchr(host + 1, ']');
	584	if (end) {
	585	*end = 0;
	586	end++;
	587	host++;
	588	} else
	589	end = host;
	590	} else
	591	end = host;
	592
	593	path = strchr(end, c);
	594	if (c == ':') {
	595	if (path) {
faea9ccb	596	protocol = PROTO_SSH;
356bece0 YH	597	*path++ = '\0';
	598	} else
	599	path = host;
f7192598	600	}
2386d658	601
faea9ccb AE	602	if (!path \|\| !*path)
	603	die("No path specified. See 'man git-pull' for valid url syntax");
	604
	605	/*
	606	* null-terminate hostname and point path to ~ for URL's like this:
	607	* ssh://host.xz/~user/repo
	608	*/
	609	if (protocol != PROTO_LOCAL && host != url) {
	610	char *ptr = path;
	611	if (path[1] == '~')
	612	path++;
	613	else
	614	path = strdup(ptr);
	615
	616	*ptr = '\0';
	617	}
	618
f8014776	619	if (protocol == PROTO_GIT) {
e814bc4d	620	if (git_use_proxy(host))
f8014776	621	return git_proxy_connect(fd, prog, host, path);
2386d658	622	return git_tcp_connect(fd, prog, host, path);
f8014776	623	}
2386d658	624
f7192598 LT	625	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	626	die("unable to create pipe pair for communication");
	627	pid = fork();
	628	if (!pid) {
b10d0ec7 JH	629	snprintf(command, sizeof(command), "%s %s", prog,
b10d0ec7 JH	630	sq_quote(path));
f7192598 LT	631	dup2(pipefd[1][0], 0);
	632	dup2(pipefd[0][1], 1);
	633	close(pipefd[0][0]);
	634	close(pipefd[0][1]);
	635	close(pipefd[1][0]);
	636	close(pipefd[1][1]);
4852f723	637	if (protocol == PROTO_SSH) {
c7c81b3a JR	638	const char ssh, ssh_basename;
	639	ssh = getenv("GIT_SSH");
	640	if (!ssh) ssh = "ssh";
	641	ssh_basename = strrchr(ssh, '/');
4852f723 MS	642	if (!ssh_basename)
	643	ssh_basename = ssh;
	644	else
	645	ssh_basename++;
	646	execlp(ssh, ssh_basename, host, command, NULL);
	647	}
016fb48b MD	648	else {
	649	unsetenv(ALTERNATE_DB_ENVIRONMENT);
	650	unsetenv(DB_ENVIRONMENT);
	651	unsetenv(GIT_DIR_ENVIRONMENT);
	652	unsetenv(GRAFT_ENVIRONMENT);
	653	unsetenv(INDEX_ENVIRONMENT);
f7192598	654	execlp("sh", "sh", "-c", command, NULL);
016fb48b	655	}
f7192598	656	die("exec failed");
016fb48b	657	}
f7192598 LT	658	fd[0] = pipefd[0][0];
	659	fd[1] = pipefd[1][1];
	660	close(pipefd[0][1]);
	661	close(pipefd[1][0]);
	662	return pid;
	663	}
	664
	665	int finish_connect(pid_t pid)
	666	{
	667	int ret;
	668
	669	for (;;) {
	670	ret = waitpid(pid, NULL, 0);
	671	if (!ret)
	672	break;
	673	if (errno != EINTR)
	674	break;
	675	}
	676	return ret;
	677	}