[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>
#include <signal.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 ", 4)) {
		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 (i + 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

/*
 * Returns a connected socket() fd, or else die()s.
 */
static int git_tcp_connect_sock(char *host)
{
	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));

	return sockfd;
}

#else /* NO_IPV6 */

/*
 * Returns a connected socket() fd, or else die()s.
 */
static int git_tcp_connect_sock(char *host)
{
	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));

	return sockfd;
}

#endif /* NO_IPV6 */


static void git_tcp_connect(int fd[2],
			    const char *prog, char *host, char *path)
{
	int sockfd = git_tcp_connect_sock(host);

	fd[0] = sockfd;
	fd[1] = sockfd;
}


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 void 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");
	}
	if (pid < 0)
		die("fork failed");
	fd[0] = pipefd[0][0];
	fd[1] = pipefd[1][1];
	close(pipefd[0][1]);
	close(pipefd[1][0]);
}

/*
 * 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;
	int free_path = 0;

	/* Without this we cannot rely on waitpid() to tell
	 * what happened to our children.
	 */
	signal(SIGCHLD, SIG_DFL);

	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);
			free_path = 1;
		}

		*ptr = '\0';
	}

	if (protocol == PROTO_GIT) {
		/* These underlying connection commands die() if they
		 * cannot connect.
		 */
		char *target_host = strdup(host);
		if (git_use_proxy(host))
			git_proxy_connect(fd, prog, host, path);
		else
			git_tcp_connect(fd, prog, host, path);
		/*
		 * Separate original protocol components prog and path
		 * from extended components with a NUL byte.
		 */
		packet_write(fd[1],
			     "%s %s%chost=%s%c",
			     prog, path, 0,
			     target_host, 0);
		free(target_host);
		if (free_path)
			free(path);
		return 0;
	}

	if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
		die("unable to create pipe pair for communication");
	pid = fork();
	if (pid < 0)
		die("unable to 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]);
	if (free_path)
		free(path);
	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>
e898081d	11	#include <signal.h>
f7192598	12
1f5881bb	13	static char *server_capabilities = NULL;
211b5f9e	14
d1c133f5 LT	15	/*
	16	* Read all the refs from the other end
	17	*/
1a7141ff JH	18	struct ref get_remote_heads(int in, struct ref list,
1a7141ff JH	19	int nr_match, char **match, int ignore_funny)
d1c133f5 LT	20	{
	21	*list = NULL;
	22	for (;;) {
	23	struct ref *ref;
	24	unsigned char old_sha1[20];
	25	static char buffer[1000];
	26	char *name;
211b5f9e	27	int len, name_len;
d1c133f5 LT	28
	29	len = packet_read_line(in, buffer, sizeof(buffer));
	30	if (!len)
	31	break;
	32	if (buffer[len-1] == '\n')
	33	buffer[--len] = 0;
	34
	35	if (len < 42 \|\| get_sha1_hex(buffer, old_sha1) \|\| buffer[40] != ' ')
	36	die("protocol error: expected sha/ref, got '%s'", buffer);
	37	name = buffer + 41;
1a7141ff	38
211b5f9e JS	39	name_len = strlen(name);
	40	if (len != name_len + 41) {
	41	if (server_capabilities)
	42	free(server_capabilities);
	43	server_capabilities = strdup(name + name_len + 1);
	44	}
	45
cfee10a7 JH	46	if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
	47	check_ref_format(name + 5))
	48	continue;
	49
d1c133f5 LT	50	if (nr_match && !path_match(name, nr_match, match))
d1c133f5 LT	51	continue;
f88395ac	52	ref = xcalloc(1, sizeof(*ref) + len - 40);
d1c133f5	53	memcpy(ref->old_sha1, old_sha1, 20);
d1c133f5	54	memcpy(ref->name, buffer + 41, len - 40);
d1c133f5 LT	55	*list = ref;
	56	list = &ref->next;
	57	}
	58	return list;
	59	}
	60
211b5f9e JS	61	int server_supports(const char *feature)
211b5f9e JS	62	{
1f5881bb JS	63	return server_capabilities &&
1f5881bb JS	64	strstr(server_capabilities, feature) != NULL;
211b5f9e JS	65	}
211b5f9e JS	66
41cb7488 LT	67	int get_ack(int fd, unsigned char *result_sha1)
	68	{
	69	static char line[1000];
	70	int len = packet_read_line(fd, line, sizeof(line));
	71
	72	if (!len)
	73	die("git-fetch-pack: expected ACK/NAK, got EOF");
	74	if (line[len-1] == '\n')
	75	line[--len] = 0;
	76	if (!strcmp(line, "NAK"))
	77	return 0;
da2a95b2	78	if (!strncmp(line, "ACK ", 4)) {
c4c86f07 JS	79	if (!get_sha1_hex(line+4, result_sha1)) {
	80	if (strstr(line+45, "continue"))
	81	return 2;
41cb7488	82	return 1;
c4c86f07	83	}
41cb7488 LT	84	}
	85	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
	86	}
	87
013e7c7f LT	88	int path_match(const char path, int nr, char *match)
	89	{
	90	int i;
	91	int pathlen = strlen(path);
	92
	93	for (i = 0; i < nr; i++) {
	94	char *s = match[i];
	95	int len = strlen(s);
	96
	97	if (!len \|\| len > pathlen)
	98	continue;
	99	if (memcmp(path + pathlen - len, s, len))
	100	continue;
	101	if (pathlen > len && path[pathlen - len - 1] != '/')
	102	continue;
	103	*s = 0;
9546010b	104	return (i + 1);
013e7c7f LT	105	}
	106	return 0;
	107	}
	108
f88395ac JH	109	struct refspec {
	110	char *src;
	111	char *dst;
ff27adf3	112	char force;
f88395ac JH	113	};
f88395ac JH	114
ff27adf3 JH	115	/*
	116	* A:B means fast forward remote B with local A.
	117	* +A:B means overwrite remote B with local A.
	118	* +A is a shorthand for +A:A.
	119	* A is a shorthand for A:A.
	120	*/
f88395ac JH	121	static struct refspec parse_ref_spec(int nr_refspec, char *refspec)
	122	{
	123	int i;
ff27adf3	124	struct refspec rs = xcalloc(sizeof(rs), (nr_refspec + 1));
f88395ac JH	125	for (i = 0; i < nr_refspec; i++) {
	126	char sp, dp, *ep;
	127	sp = refspec[i];
ff27adf3 JH	128	if (*sp == '+') {
	129	rs[i].force = 1;
	130	sp++;
	131	}
f88395ac JH	132	ep = strchr(sp, ':');
	133	if (ep) {
	134	dp = ep + 1;
	135	*ep = 0;
	136	}
	137	else
	138	dp = sp;
	139	rs[i].src = sp;
	140	rs[i].dst = dp;
	141	}
	142	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	143	return rs;
	144	}
	145
	146	static int count_refspec_match(const char *pattern,
	147	struct ref *refs,
	148	struct ref **matched_ref)
	149	{
	150	int match;
	151	int patlen = strlen(pattern);
	152
	153	for (match = 0; refs; refs = refs->next) {
	154	char *name = refs->name;
	155	int namelen = strlen(name);
	156	if (namelen < patlen \|\|
	157	memcmp(name + namelen - patlen, pattern, patlen))
	158	continue;
	159	if (namelen != patlen && name[namelen - patlen - 1] != '/')
	160	continue;
	161	match++;
	162	*matched_ref = refs;
	163	}
	164	return match;
	165	}
	166
	167	static void link_dst_tail(struct ref ref, struct ref **tail)
	168	{
	169	**tail = ref;
	170	*tail = &ref->next;
	171	**tail = NULL;
	172	}
	173
15e02b37 JH	174	static struct ref try_explicit_object_name(const char name)
	175	{
	176	unsigned char sha1[20];
	177	struct ref *ref;
	178	int len;
	179	if (get_sha1(name, sha1))
	180	return NULL;
	181	len = strlen(name) + 1;
	182	ref = xcalloc(1, sizeof(*ref) + len);
	183	memcpy(ref->name, name, len);
	184	memcpy(ref->new_sha1, sha1, 20);
	185	return ref;
	186	}
	187
f88395ac JH	188	static int match_explicit_refs(struct ref src, struct ref dst,
	189	struct ref **dst_tail, struct refspec rs)
	190	{
	191	int i, errs;
	192	for (i = errs = 0; rs[i].src; i++) {
	193	struct ref matched_src, matched_dst;
	194
	195	matched_src = matched_dst = NULL;
	196	switch (count_refspec_match(rs[i].src, src, &matched_src)) {
	197	case 1:
	198	break;
	199	case 0:
15e02b37 JH	200	/* The source could be in the get_sha1() format
	201	* not a reference name.
	202	*/
	203	matched_src = try_explicit_object_name(rs[i].src);
	204	if (matched_src)
	205	break;
f88395ac	206	errs = 1;
4ec99bf0 TS	207	error("src refspec %s does not match any.",
4ec99bf0 TS	208	rs[i].src);
f88395ac JH	209	break;
	210	default:
	211	errs = 1;
	212	error("src refspec %s matches more than one.",
	213	rs[i].src);
	214	break;
	215	}
	216	switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
	217	case 1:
	218	break;
	219	case 0:
	220	if (!memcmp(rs[i].dst, "refs/", 5)) {
	221	int len = strlen(rs[i].dst) + 1;
	222	matched_dst = xcalloc(1, sizeof(*dst) + len);
	223	memcpy(matched_dst->name, rs[i].dst, len);
	224	link_dst_tail(matched_dst, dst_tail);
	225	}
	226	else if (!strcmp(rs[i].src, rs[i].dst) &&
	227	matched_src) {
	228	/* pushing "master:master" when
	229	* remote does not have master yet.
	230	*/
4fa1604f	231	int len = strlen(matched_src->name) + 1;
f88395ac JH	232	matched_dst = xcalloc(1, sizeof(*dst) + len);
	233	memcpy(matched_dst->name, matched_src->name,
	234	len);
	235	link_dst_tail(matched_dst, dst_tail);
	236	}
	237	else {
	238	errs = 1;
	239	error("dst refspec %s does not match any "
	240	"existing ref on the remote and does "
	241	"not start with refs/.", rs[i].dst);
	242	}
	243	break;
	244	default:
	245	errs = 1;
	246	error("dst refspec %s matches more than one.",
	247	rs[i].dst);
	248	break;
	249	}
	250	if (errs)
	251	continue;
f88395ac JH	252	if (matched_dst->peer_ref) {
	253	errs = 1;
	254	error("dst ref %s receives from more than one src.",
	255	matched_dst->name);
	256	}
ff27adf3	257	else {
f88395ac	258	matched_dst->peer_ref = matched_src;
ff27adf3 JH	259	matched_dst->force = rs[i].force;
ff27adf3 JH	260	}
f88395ac JH	261	}
	262	return -errs;
	263	}
	264
	265	static struct ref find_ref_by_name(struct ref list, const char *name)
	266	{
	267	for ( ; list; list = list->next)
	268	if (!strcmp(list->name, name))
	269	return list;
	270	return NULL;
	271	}
	272
	273	int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
	274	int nr_refspec, char **refspec, int all)
	275	{
	276	struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
	277
	278	if (nr_refspec)
	279	return match_explicit_refs(src, dst, dst_tail, rs);
	280
	281	/* pick the remainder */
	282	for ( ; src; src = src->next) {
	283	struct ref *dst_peer;
	284	if (src->peer_ref)
	285	continue;
	286	dst_peer = find_ref_by_name(dst, src->name);
635d37af	287	if ((dst_peer && dst_peer->peer_ref) \|\| (!dst_peer && !all))
f88395ac JH	288	continue;
f88395ac JH	289	if (!dst_peer) {
f88395ac JH	290	/* Create a new one and link it */
	291	int len = strlen(src->name) + 1;
	292	dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
	293	memcpy(dst_peer->name, src->name, len);
	294	memcpy(dst_peer->new_sha1, src->new_sha1, 20);
	295	link_dst_tail(dst_peer, dst_tail);
	296	}
	297	dst_peer->peer_ref = src;
	298	}
	299	return 0;
	300	}
	301
2386d658 LT	302	enum protocol {
	303	PROTO_LOCAL = 1,
	304	PROTO_SSH,
	305	PROTO_GIT,
	306	};
	307
	308	static enum protocol get_protocol(const char *name)
	309	{
	310	if (!strcmp(name, "ssh"))
	311	return PROTO_SSH;
	312	if (!strcmp(name, "git"))
	313	return PROTO_GIT;
c05186cc LT	314	if (!strcmp(name, "git+ssh"))
	315	return PROTO_SSH;
	316	if (!strcmp(name, "ssh+git"))
	317	return PROTO_SSH;
2386d658 LT	318	die("I don't handle protocol '%s'", name);
	319	}
	320
5ba88448 YH	321	#define STR_(s) # s
5ba88448 YH	322	#define STR(s) STR_(s)
2386d658	323
49744d63	324	#ifndef NO_IPV6
4c505f71	325
5ad312be JL	326	/*
	327	* Returns a connected socket() fd, or else die()s.
	328	*/
	329	static int git_tcp_connect_sock(char *host)
2386d658	330	{
5ba88448 YH	331	int sockfd = -1;
	332	char colon, end;
	333	char *port = STR(DEFAULT_GIT_PORT);
	334	struct addrinfo hints, ai0, ai;
	335	int gai;
	336
	337	if (host[0] == '[') {
	338	end = strchr(host + 1, ']');
	339	if (end) {
	340	*end = 0;
	341	end++;
	342	host++;
	343	} else
	344	end = host;
	345	} else
	346	end = host;
	347	colon = strchr(end, ':');
	348
ce6f8e7e LT	349	if (colon) {
ce6f8e7e LT	350	*colon = 0;
5ba88448	351	port = colon + 1;
ce6f8e7e	352	}
5ba88448 YH	353
	354	memset(&hints, 0, sizeof(hints));
	355	hints.ai_socktype = SOCK_STREAM;
	356	hints.ai_protocol = IPPROTO_TCP;
	357
	358	gai = getaddrinfo(host, port, &hints, &ai);
	359	if (gai)
	360	die("Unable to look up %s (%s)", host, gai_strerror(gai));
	361
	362	for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be JL	363	sockfd = socket(ai->ai_family,
5ad312be JL	364	ai->ai_socktype, ai->ai_protocol);
5ba88448 YH	365	if (sockfd < 0)
	366	continue;
	367	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
	368	close(sockfd);
	369	sockfd = -1;
	370	continue;
2386d658	371	}
5ba88448	372	break;
2386d658 LT	373	}
2386d658 LT	374
5ba88448	375	freeaddrinfo(ai0);
2386d658	376
2386d658	377	if (sockfd < 0)
5ba88448 YH	378	die("unable to connect a socket (%s)", strerror(errno));
5ba88448 YH	379
5ad312be	380	return sockfd;
2386d658 LT	381	}
2386d658 LT	382
49744d63	383	#else /* NO_IPV6 */
4c505f71	384
5ad312be JL	385	/*
	386	* Returns a connected socket() fd, or else die()s.
	387	*/
	388	static int git_tcp_connect_sock(char *host)
4c505f71 PA	389	{
	390	int sockfd = -1;
	391	char colon, end;
	392	char port = STR(DEFAULT_GIT_PORT), ep;
	393	struct hostent *he;
	394	struct sockaddr_in sa;
	395	char **ap;
	396	unsigned int nport;
	397
	398	if (host[0] == '[') {
	399	end = strchr(host + 1, ']');
	400	if (end) {
	401	*end = 0;
	402	end++;
	403	host++;
	404	} else
	405	end = host;
	406	} else
	407	end = host;
	408	colon = strchr(end, ':');
	409
	410	if (colon) {
	411	*colon = 0;
	412	port = colon + 1;
	413	}
	414
4c505f71 PA	415	he = gethostbyname(host);
	416	if (!he)
	417	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	418	nport = strtoul(port, &ep, 10);
	419	if ( ep == port \|\| *ep ) {
	420	/* Not numeric */
	421	struct servent *se = getservbyname(port,"tcp");
	422	if ( !se )
	423	die("Unknown port %s\n", port);
	424	nport = se->s_port;
	425	}
	426
	427	for (ap = he->h_addr_list; *ap; ap++) {
	428	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
	429	if (sockfd < 0)
	430	continue;
	431
	432	memset(&sa, 0, sizeof sa);
	433	sa.sin_family = he->h_addrtype;
6573faff	434	sa.sin_port = htons(nport);
c6164218	435	memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 PA	436
	437	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
	438	close(sockfd);
	439	sockfd = -1;
	440	continue;
	441	}
	442	break;
	443	}
	444
	445	if (sockfd < 0)
	446	die("unable to connect a socket (%s)", strerror(errno));
	447
5ad312be JL	448	return sockfd;
	449	}
	450
	451	#endif /* NO_IPV6 */
	452
	453
	454	static void git_tcp_connect(int fd[2],
	455	const char prog, char host, char *path)
	456	{
	457	int sockfd = git_tcp_connect_sock(host);
	458
4c505f71 PA	459	fd[0] = sockfd;
4c505f71 PA	460	fd[1] = sockfd;
4c505f71 PA	461	}
4c505f71 PA	462
4c505f71	463
f8014776	464	static char *git_proxy_command = NULL;
e814bc4d JH	465	static const char *rhost_name = NULL;
e814bc4d JH	466	static int rhost_len;
f8014776 PC	467
	468	static int git_proxy_command_options(const char var, const char value)
	469	{
e814bc4d	470	if (!strcmp(var, "core.gitproxy")) {
c3df8568 YH	471	const char *for_pos;
	472	int matchlen = -1;
	473	int hostlen;
	474
e814bc4d	475	if (git_proxy_command)
f8014776	476	return 0;
e814bc4d JH	477	/* [core]
	478	* ;# matches www.kernel.org as well
	479	* gitproxy = netcatter-1 for kernel.org
	480	* gitproxy = netcatter-2 for sample.xz
	481	* gitproxy = netcatter-default
	482	*/
c3df8568	483	for_pos = strstr(value, " for ");
e814bc4d JH	484	if (!for_pos)
	485	/* matches everybody */
	486	matchlen = strlen(value);
	487	else {
	488	hostlen = strlen(for_pos + 5);
	489	if (rhost_len < hostlen)
	490	matchlen = -1;
	491	else if (!strncmp(for_pos + 5,
	492	rhost_name + rhost_len - hostlen,
	493	hostlen) &&
	494	((rhost_len == hostlen) \|\|
	495	rhost_name[rhost_len - hostlen -1] == '.'))
	496	matchlen = for_pos - value;
	497	else
	498	matchlen = -1;
	499	}
	500	if (0 <= matchlen) {
	501	/* core.gitproxy = none for kernel.org */
	502	if (matchlen == 4 &&
	503	!memcmp(value, "none", 4))
	504	matchlen = 0;
	505	git_proxy_command = xmalloc(matchlen + 1);
	506	memcpy(git_proxy_command, value, matchlen);
	507	git_proxy_command[matchlen] = 0;
f8014776	508	}
e814bc4d	509	return 0;
f8014776 PC	510	}
	511
	512	return git_default_config(var, value);
	513	}
	514
e814bc4d	515	static int git_use_proxy(const char *host)
f8014776	516	{
e814bc4d JH	517	rhost_name = host;
e814bc4d JH	518	rhost_len = strlen(host);
f8014776 PC	519	git_proxy_command = getenv("GIT_PROXY_COMMAND");
f8014776 PC	520	git_config(git_proxy_command_options);
e814bc4d JH	521	rhost_name = NULL;
e814bc4d JH	522	return (git_proxy_command && *git_proxy_command);
f8014776 PC	523	}
f8014776 PC	524
5ad312be JL	525	static void git_proxy_connect(int fd[2],
5ad312be JL	526	const char prog, char host, char *path)
f8014776 PC	527	{
	528	char *port = STR(DEFAULT_GIT_PORT);
	529	char colon, end;
	530	int pipefd[2][2];
	531	pid_t pid;
	532
	533	if (host[0] == '[') {
	534	end = strchr(host + 1, ']');
	535	if (end) {
	536	*end = 0;
	537	end++;
	538	host++;
	539	} else
	540	end = host;
	541	} else
	542	end = host;
	543	colon = strchr(end, ':');
	544
	545	if (colon) {
	546	*colon = 0;
	547	port = colon + 1;
	548	}
	549
	550	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	551	die("unable to create pipe pair for communication");
	552	pid = fork();
	553	if (!pid) {
	554	dup2(pipefd[1][0], 0);
	555	dup2(pipefd[0][1], 1);
	556	close(pipefd[0][0]);
	557	close(pipefd[0][1]);
	558	close(pipefd[1][0]);
	559	close(pipefd[1][1]);
	560	execlp(git_proxy_command, git_proxy_command, host, port, NULL);
	561	die("exec failed");
	562	}
5ad312be JL	563	if (pid < 0)
5ad312be JL	564	die("fork failed");
f8014776 PC	565	fd[0] = pipefd[0][0];
	566	fd[1] = pipefd[1][1];
	567	close(pipefd[0][1]);
	568	close(pipefd[1][0]);
f8014776 PC	569	}
f8014776 PC	570
f7192598 LT	571	/*
	572	* Yeah, yeah, fixme. Need to pass in the heads etc.
	573	*/
	574	int git_connect(int fd[2], char url, const char prog)
	575	{
	576	char command[1024];
faea9ccb	577	char host, path = url;
356bece0 YH	578	char *end;
356bece0 YH	579	int c;
f7192598 LT	580	int pipefd[2][2];
f7192598 LT	581	pid_t pid;
faea9ccb	582	enum protocol protocol = PROTO_LOCAL;
da2a95b2	583	int free_path = 0;
faea9ccb	584
f0b7367c JH	585	/* Without this we cannot rely on waitpid() to tell
	586	* what happened to our children.
	587	*/
	588	signal(SIGCHLD, SIG_DFL);
	589
faea9ccb AE	590	host = strstr(url, "://");
	591	if(host) {
	592	*host = '\0';
	593	protocol = get_protocol(url);
	594	host += 3;
356bece0 YH	595	c = '/';
356bece0 YH	596	} else {
f7192598	597	host = url;
356bece0 YH	598	c = ':';
	599	}
	600
	601	if (host[0] == '[') {
	602	end = strchr(host + 1, ']');
	603	if (end) {
	604	*end = 0;
	605	end++;
	606	host++;
	607	} else
	608	end = host;
	609	} else
	610	end = host;
	611
	612	path = strchr(end, c);
	613	if (c == ':') {
	614	if (path) {
faea9ccb	615	protocol = PROTO_SSH;
356bece0 YH	616	*path++ = '\0';
	617	} else
	618	path = host;
f7192598	619	}
2386d658	620
faea9ccb AE	621	if (!path \|\| !*path)
	622	die("No path specified. See 'man git-pull' for valid url syntax");
	623
	624	/*
	625	* null-terminate hostname and point path to ~ for URL's like this:
	626	* ssh://host.xz/~user/repo
	627	*/
	628	if (protocol != PROTO_LOCAL && host != url) {
	629	char *ptr = path;
	630	if (path[1] == '~')
	631	path++;
da2a95b2	632	else {
faea9ccb	633	path = strdup(ptr);
da2a95b2 SH	634	free_path = 1;
da2a95b2 SH	635	}
faea9ccb AE	636
	637	*ptr = '\0';
	638	}
	639
f8014776	640	if (protocol == PROTO_GIT) {
5ad312be JL	641	/* These underlying connection commands die() if they
	642	* cannot connect.
	643	*/
	644	char *target_host = strdup(host);
e814bc4d	645	if (git_use_proxy(host))
5ad312be	646	git_proxy_connect(fd, prog, host, path);
da2a95b2	647	else
5ad312be JL	648	git_tcp_connect(fd, prog, host, path);
	649	/*
	650	* Separate original protocol components prog and path
	651	* from extended components with a NUL byte.
	652	*/
	653	packet_write(fd[1],
	654	"%s %s%chost=%s%c",
	655	prog, path, 0,
	656	target_host, 0);
	657	free(target_host);
da2a95b2 SH	658	if (free_path)
da2a95b2 SH	659	free(path);
5ad312be	660	return 0;
f8014776	661	}
2386d658	662
f7192598 LT	663	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	664	die("unable to create pipe pair for communication");
	665	pid = fork();
c9bc159d PD	666	if (pid < 0)
c9bc159d PD	667	die("unable to fork");
f7192598	668	if (!pid) {
b10d0ec7 JH	669	snprintf(command, sizeof(command), "%s %s", prog,
b10d0ec7 JH	670	sq_quote(path));
f7192598 LT	671	dup2(pipefd[1][0], 0);
	672	dup2(pipefd[0][1], 1);
	673	close(pipefd[0][0]);
	674	close(pipefd[0][1]);
	675	close(pipefd[1][0]);
	676	close(pipefd[1][1]);
4852f723	677	if (protocol == PROTO_SSH) {
c7c81b3a JR	678	const char ssh, ssh_basename;
	679	ssh = getenv("GIT_SSH");
	680	if (!ssh) ssh = "ssh";
	681	ssh_basename = strrchr(ssh, '/');
4852f723 MS	682	if (!ssh_basename)
	683	ssh_basename = ssh;
	684	else
	685	ssh_basename++;
	686	execlp(ssh, ssh_basename, host, command, NULL);
	687	}
016fb48b MD	688	else {
	689	unsetenv(ALTERNATE_DB_ENVIRONMENT);
	690	unsetenv(DB_ENVIRONMENT);
	691	unsetenv(GIT_DIR_ENVIRONMENT);
	692	unsetenv(GRAFT_ENVIRONMENT);
	693	unsetenv(INDEX_ENVIRONMENT);
f7192598	694	execlp("sh", "sh", "-c", command, NULL);
016fb48b	695	}
f7192598	696	die("exec failed");
016fb48b	697	}
f7192598 LT	698	fd[0] = pipefd[0][0];
	699	fd[1] = pipefd[1][1];
	700	close(pipefd[0][1]);
	701	close(pipefd[1][0]);
da2a95b2 SH	702	if (free_path)
da2a95b2 SH	703	free(path);
f7192598 LT	704	return pid;
	705	}
	706
	707	int finish_connect(pid_t pid)
	708	{
	709	int ret;
	710
	711	for (;;) {
	712	ret = waitpid(pid, NULL, 0);
	713	if (!ret)
	714	break;
	715	if (errno != EINTR)
	716	break;
	717	}
	718	return ret;
	719	}