[thirdparty/git.git] / connect.c

#include "git-compat-util.h"
#include "cache.h"
#include "pkt-line.h"
#include "quote.h"
#include "refs.h"
#include "run-command.h"
#include "remote.h"

static char *server_capabilities;

static int check_ref(const char *name, int len, unsigned int flags)
{
	if (!flags)
		return 1;

	if (len < 5 || memcmp(name, "refs/", 5))
		return 0;

	/* Skip the "refs/" part */
	name += 5;
	len -= 5;

	/* REF_NORMAL means that we don't want the magic fake tag refs */
	if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
		return 0;

	/* REF_HEADS means that we want regular branch heads */
	if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
		return 1;

	/* REF_TAGS means that we want tags */
	if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
		return 1;

	/* All type bits clear means that we are ok with anything */
	return !(flags & ~REF_NORMAL);
}

/*
 * Read all the refs from the other end
 */
struct ref **get_remote_heads(int in, struct ref **list,
			      int nr_match, char **match,
			      unsigned int flags)
{
	*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 = xstrdup(name + name_len + 1);
		}

		if (!check_ref(name, name_len, flags))
			continue;
		if (nr_match && !path_match(name, nr_match, match))
			continue;
		ref = alloc_ref(len - 40);
		hashcpy(ref->old_sha1, old_sha1);
		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 (!prefixcmp(line, "ACK ")) {
		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;
}

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;
	if (!strcmp(name, "file"))
		return PROTO_LOCAL;
	die("I don't handle protocol '%s'", name);
}

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

#ifndef NO_IPV6

static const char *ai_name(const struct addrinfo *ai)
{
	static char addr[INET_ADDRSTRLEN];
	if ( AF_INET == ai->ai_family ) {
		struct sockaddr_in *in;
		in = (struct sockaddr_in *)ai->ai_addr;
		inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
	} else if ( AF_INET6 == ai->ai_family ) {
		struct sockaddr_in6 *in;
		in = (struct sockaddr_in6 *)ai->ai_addr;
		inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
	} else {
		strcpy(addr, "(unknown)");
	}
	return addr;
}

/*
 * Returns a connected socket() fd, or else die()s.
 */
static int git_tcp_connect_sock(char *host, int flags)
{
	int sockfd = -1, saved_errno = 0;
	char *colon, *end;
	const char *port = STR(DEFAULT_GIT_PORT);
	struct addrinfo hints, *ai0, *ai;
	int gai;
	int cnt = 0;

	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 (!*port)
			port = "<none>";
	}

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

	if (flags & CONNECT_VERBOSE)
		fprintf(stderr, "Looking up %s ... ", host);

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

	if (flags & CONNECT_VERBOSE)
		fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);

	for (ai0 = ai; ai; ai = ai->ai_next) {
		sockfd = socket(ai->ai_family,
				ai->ai_socktype, ai->ai_protocol);
		if (sockfd < 0) {
			saved_errno = errno;
			continue;
		}
		if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
			saved_errno = errno;
			fprintf(stderr, "%s[%d: %s]: errno=%s\n",
				host,
				cnt,
				ai_name(ai),
				strerror(saved_errno));
			close(sockfd);
			sockfd = -1;
			continue;
		}
		if (flags & CONNECT_VERBOSE)
			fprintf(stderr, "%s ", ai_name(ai));
		break;
	}

	freeaddrinfo(ai0);

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

	if (flags & CONNECT_VERBOSE)
		fprintf(stderr, "done.\n");

	return sockfd;
}

#else /* NO_IPV6 */

/*
 * Returns a connected socket() fd, or else die()s.
 */
static int git_tcp_connect_sock(char *host, int flags)
{
	int sockfd = -1, saved_errno = 0;
	char *colon, *end;
	char *port = STR(DEFAULT_GIT_PORT), *ep;
	struct hostent *he;
	struct sockaddr_in sa;
	char **ap;
	unsigned int nport;
	int cnt;

	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 (flags & CONNECT_VERBOSE)
		fprintf(stderr, "Looking up %s ... ", host);

	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;
	}

	if (flags & CONNECT_VERBOSE)
		fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);

	for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
		sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
		if (sockfd < 0) {
			saved_errno = errno;
			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) {
			saved_errno = errno;
			fprintf(stderr, "%s[%d: %s]: errno=%s\n",
				host,
				cnt,
				inet_ntoa(*(struct in_addr *)&sa.sin_addr),
				strerror(saved_errno));
			close(sockfd);
			sockfd = -1;
			continue;
		}
		if (flags & CONNECT_VERBOSE)
			fprintf(stderr, "%s ",
				inet_ntoa(*(struct in_addr *)&sa.sin_addr));
		break;
	}

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

	if (flags & CONNECT_VERBOSE)
		fprintf(stderr, "done.\n");

	return sockfd;
}

#endif /* NO_IPV6 */


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

	fd[0] = sockfd;
	fd[1] = dup(sockfd);
}


static char *git_proxy_command;
static const char *rhost_name;
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], char *host)
{
	const char *port = STR(DEFAULT_GIT_PORT);
	char *colon, *end;
	const char *argv[4];
	struct child_process proxy;

	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;
	}

	argv[0] = git_proxy_command;
	argv[1] = host;
	argv[2] = port;
	argv[3] = NULL;
	memset(&proxy, 0, sizeof(proxy));
	proxy.argv = argv;
	proxy.in = -1;
	proxy.out = -1;
	if (start_command(&proxy))
		die("cannot start proxy %s", argv[0]);
	fd[0] = proxy.out; /* read from proxy stdout */
	fd[1] = proxy.in;  /* write to proxy stdin */
}

#define MAX_CMD_LEN 1024

/*
 * This returns 0 if the transport protocol does not need fork(2),
 * or a process id if it does.  Once done, finish the connection
 * with finish_connect() with the value returned from this function
 * (it is safe to call finish_connect() with 0 to support the former
 * case).
 *
 * Does not return a negative value on error; it just dies.
 */
pid_t git_connect(int fd[2], char *url, const char *prog, int flags)
{
	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 (path) {
		if (c == ':') {
			protocol = PROTO_SSH;
			*path++ = '\0';
		}
	} else
		path = end;

	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 = xstrdup(ptr);
			free_path = 1;
		}

		*ptr = '\0';
	}

	if (protocol == PROTO_GIT) {
		/* These underlying connection commands die() if they
		 * cannot connect.
		 */
		char *target_host = xstrdup(host);
		if (git_use_proxy(host))
			git_proxy_connect(fd, host);
		else
			git_tcp_connect(fd, host, flags);
		/*
		 * 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) {
		char command[MAX_CMD_LEN];
		char *posn = command;
		int size = MAX_CMD_LEN;
		int of = 0;

		of |= add_to_string(&posn, &size, prog, 0);
		of |= add_to_string(&posn, &size, " ", 0);
		of |= add_to_string(&posn, &size, path, 1);

		if (of)
			die("command line too long");

		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(GIT_WORK_TREE_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)
{
	if (pid == 0)
		return 0;

	while (waitpid(pid, NULL, 0) < 0) {
		if (errno != EINTR)
			return -1;
	}
	return 0;
}
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"
15a1c012	6	#include "run-command.h"
6b62816c	7	#include "remote.h"
f7192598	8
96f1e58f	9	static char *server_capabilities;
211b5f9e	10
2718ff09 LT	11	static int check_ref(const char *name, int len, unsigned int flags)
	12	{
	13	if (!flags)
	14	return 1;
	15
c41e20b3	16	if (len < 5 \|\| memcmp(name, "refs/", 5))
2718ff09 LT	17	return 0;
	18
	19	/* Skip the "refs/" part */
	20	name += 5;
	21	len -= 5;
	22
	23	/* REF_NORMAL means that we don't want the magic fake tag refs */
	24	if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
	25	return 0;
	26
	27	/* REF_HEADS means that we want regular branch heads */
	28	if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
	29	return 1;
	30
	31	/* REF_TAGS means that we want tags */
	32	if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
	33	return 1;
	34
	35	/* All type bits clear means that we are ok with anything */
	36	return !(flags & ~REF_NORMAL);
	37	}
	38
d1c133f5 LT	39	/*
	40	* Read all the refs from the other end
	41	*/
1a7141ff	42	struct ref get_remote_heads(int in, struct ref list,
2718ff09 LT	43	int nr_match, char **match,
2718ff09 LT	44	unsigned int flags)
d1c133f5 LT	45	{
	46	*list = NULL;
	47	for (;;) {
	48	struct ref *ref;
	49	unsigned char old_sha1[20];
	50	static char buffer[1000];
	51	char *name;
211b5f9e	52	int len, name_len;
d1c133f5 LT	53
	54	len = packet_read_line(in, buffer, sizeof(buffer));
	55	if (!len)
	56	break;
	57	if (buffer[len-1] == '\n')
	58	buffer[--len] = 0;
	59
	60	if (len < 42 \|\| get_sha1_hex(buffer, old_sha1) \|\| buffer[40] != ' ')
	61	die("protocol error: expected sha/ref, got '%s'", buffer);
	62	name = buffer + 41;
1a7141ff	63
211b5f9e JS	64	name_len = strlen(name);
	65	if (len != name_len + 41) {
	66	if (server_capabilities)
	67	free(server_capabilities);
9befac47	68	server_capabilities = xstrdup(name + name_len + 1);
211b5f9e JS	69	}
211b5f9e JS	70
2718ff09	71	if (!check_ref(name, name_len, flags))
cfee10a7	72	continue;
d1c133f5 LT	73	if (nr_match && !path_match(name, nr_match, match))
d1c133f5 LT	74	continue;
dfd255dd	75	ref = alloc_ref(len - 40);
e702496e	76	hashcpy(ref->old_sha1, old_sha1);
d1c133f5	77	memcpy(ref->name, buffer + 41, len - 40);
d1c133f5 LT	78	*list = ref;
	79	list = &ref->next;
	80	}
	81	return list;
	82	}
	83
211b5f9e JS	84	int server_supports(const char *feature)
211b5f9e JS	85	{
1f5881bb JS	86	return server_capabilities &&
1f5881bb JS	87	strstr(server_capabilities, feature) != NULL;
211b5f9e JS	88	}
211b5f9e JS	89
41cb7488 LT	90	int get_ack(int fd, unsigned char *result_sha1)
	91	{
	92	static char line[1000];
	93	int len = packet_read_line(fd, line, sizeof(line));
	94
	95	if (!len)
	96	die("git-fetch-pack: expected ACK/NAK, got EOF");
	97	if (line[len-1] == '\n')
	98	line[--len] = 0;
	99	if (!strcmp(line, "NAK"))
	100	return 0;
cc44c765	101	if (!prefixcmp(line, "ACK ")) {
c4c86f07 JS	102	if (!get_sha1_hex(line+4, result_sha1)) {
	103	if (strstr(line+45, "continue"))
	104	return 2;
41cb7488	105	return 1;
c4c86f07	106	}
41cb7488 LT	107	}
	108	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
	109	}
	110
013e7c7f LT	111	int path_match(const char path, int nr, char *match)
	112	{
	113	int i;
	114	int pathlen = strlen(path);
	115
	116	for (i = 0; i < nr; i++) {
	117	char *s = match[i];
	118	int len = strlen(s);
	119
	120	if (!len \|\| len > pathlen)
	121	continue;
	122	if (memcmp(path + pathlen - len, s, len))
	123	continue;
	124	if (pathlen > len && path[pathlen - len - 1] != '/')
	125	continue;
	126	*s = 0;
9546010b	127	return (i + 1);
013e7c7f LT	128	}
	129	return 0;
	130	}
	131
2386d658 LT	132	enum protocol {
	133	PROTO_LOCAL = 1,
	134	PROTO_SSH,
	135	PROTO_GIT,
	136	};
	137
	138	static enum protocol get_protocol(const char *name)
	139	{
	140	if (!strcmp(name, "ssh"))
	141	return PROTO_SSH;
	142	if (!strcmp(name, "git"))
	143	return PROTO_GIT;
c05186cc LT	144	if (!strcmp(name, "git+ssh"))
	145	return PROTO_SSH;
	146	if (!strcmp(name, "ssh+git"))
	147	return PROTO_SSH;
72a4f4b6 LT	148	if (!strcmp(name, "file"))
72a4f4b6 LT	149	return PROTO_LOCAL;
2386d658 LT	150	die("I don't handle protocol '%s'", name);
	151	}
	152
5ba88448 YH	153	#define STR_(s) # s
5ba88448 YH	154	#define STR(s) STR_(s)
2386d658	155
49744d63	156	#ifndef NO_IPV6
4c505f71	157
ba505322 AR	158	static const char ai_name(const struct addrinfo ai)
	159	{
	160	static char addr[INET_ADDRSTRLEN];
	161	if ( AF_INET == ai->ai_family ) {
	162	struct sockaddr_in *in;
	163	in = (struct sockaddr_in *)ai->ai_addr;
	164	inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
	165	} else if ( AF_INET6 == ai->ai_family ) {
	166	struct sockaddr_in6 *in;
	167	in = (struct sockaddr_in6 *)ai->ai_addr;
	168	inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
	169	} else {
	170	strcpy(addr, "(unknown)");
	171	}
	172	return addr;
	173	}
	174
5ad312be JL	175	/*
	176	* Returns a connected socket() fd, or else die()s.
	177	*/
7841ce79	178	static int git_tcp_connect_sock(char *host, int flags)
2386d658	179	{
ac3bc6c1	180	int sockfd = -1, saved_errno = 0;
5ba88448	181	char colon, end;
554fe20d	182	const char *port = STR(DEFAULT_GIT_PORT);
5ba88448 YH	183	struct addrinfo hints, ai0, ai;
5ba88448 YH	184	int gai;
ba505322	185	int cnt = 0;
5ba88448 YH	186
	187	if (host[0] == '[') {
	188	end = strchr(host + 1, ']');
	189	if (end) {
	190	*end = 0;
	191	end++;
	192	host++;
	193	} else
	194	end = host;
	195	} else
	196	end = host;
	197	colon = strchr(end, ':');
	198
ce6f8e7e LT	199	if (colon) {
ce6f8e7e LT	200	*colon = 0;
5ba88448	201	port = colon + 1;
608d48b2 LT	202	if (!*port)
608d48b2 LT	203	port = "<none>";
ce6f8e7e	204	}
5ba88448 YH	205
	206	memset(&hints, 0, sizeof(hints));
	207	hints.ai_socktype = SOCK_STREAM;
	208	hints.ai_protocol = IPPROTO_TCP;
	209
7841ce79 MT	210	if (flags & CONNECT_VERBOSE)
	211	fprintf(stderr, "Looking up %s ... ", host);
	212
5ba88448 YH	213	gai = getaddrinfo(host, port, &hints, &ai);
5ba88448 YH	214	if (gai)
608d48b2	215	die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448	216
7841ce79 MT	217	if (flags & CONNECT_VERBOSE)
	218	fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
	219
5ba88448	220	for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be JL	221	sockfd = socket(ai->ai_family,
5ad312be JL	222	ai->ai_socktype, ai->ai_protocol);
ac3bc6c1 PB	223	if (sockfd < 0) {
ac3bc6c1 PB	224	saved_errno = errno;
5ba88448	225	continue;
ac3bc6c1	226	}
5ba88448	227	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
ac3bc6c1	228	saved_errno = errno;
7cbf2f24	229	fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322 AR	230	host,
	231	cnt,
	232	ai_name(ai),
ba505322	233	strerror(saved_errno));
5ba88448 YH	234	close(sockfd);
	235	sockfd = -1;
	236	continue;
2386d658	237	}
ba505322 AR	238	if (flags & CONNECT_VERBOSE)
ba505322 AR	239	fprintf(stderr, "%s ", ai_name(ai));
5ba88448	240	break;
2386d658 LT	241	}
2386d658 LT	242
5ba88448	243	freeaddrinfo(ai0);
2386d658	244
2386d658	245	if (sockfd < 0)
ac3bc6c1	246	die("unable to connect a socket (%s)", strerror(saved_errno));
5ba88448	247
7841ce79 MT	248	if (flags & CONNECT_VERBOSE)
	249	fprintf(stderr, "done.\n");
	250
5ad312be	251	return sockfd;
2386d658 LT	252	}
2386d658 LT	253
49744d63	254	#else /* NO_IPV6 */
4c505f71	255
5ad312be JL	256	/*
	257	* Returns a connected socket() fd, or else die()s.
	258	*/
7841ce79	259	static int git_tcp_connect_sock(char *host, int flags)
4c505f71	260	{
ac3bc6c1	261	int sockfd = -1, saved_errno = 0;
4c505f71 PA	262	char colon, end;
	263	char port = STR(DEFAULT_GIT_PORT), ep;
	264	struct hostent *he;
	265	struct sockaddr_in sa;
	266	char **ap;
	267	unsigned int nport;
ba505322	268	int cnt;
4c505f71 PA	269
	270	if (host[0] == '[') {
	271	end = strchr(host + 1, ']');
	272	if (end) {
	273	*end = 0;
	274	end++;
	275	host++;
	276	} else
	277	end = host;
	278	} else
	279	end = host;
	280	colon = strchr(end, ':');
	281
	282	if (colon) {
	283	*colon = 0;
	284	port = colon + 1;
	285	}
	286
7841ce79 MT	287	if (flags & CONNECT_VERBOSE)
	288	fprintf(stderr, "Looking up %s ... ", host);
	289
4c505f71 PA	290	he = gethostbyname(host);
	291	if (!he)
	292	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	293	nport = strtoul(port, &ep, 10);
	294	if ( ep == port \|\| *ep ) {
	295	/* Not numeric */
	296	struct servent *se = getservbyname(port,"tcp");
	297	if ( !se )
	298	die("Unknown port %s\n", port);
	299	nport = se->s_port;
	300	}
	301
7841ce79 MT	302	if (flags & CONNECT_VERBOSE)
	303	fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
	304
ba505322	305	for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71	306	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
ac3bc6c1 PB	307	if (sockfd < 0) {
ac3bc6c1 PB	308	saved_errno = errno;
4c505f71	309	continue;
ac3bc6c1	310	}
4c505f71 PA	311
	312	memset(&sa, 0, sizeof sa);
	313	sa.sin_family = he->h_addrtype;
6573faff	314	sa.sin_port = htons(nport);
c6164218	315	memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 PA	316
4c505f71 PA	317	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
ac3bc6c1	318	saved_errno = errno;
7cbf2f24	319	fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322 AR	320	host,
	321	cnt,
	322	inet_ntoa((struct in_addr )&sa.sin_addr),
ba505322	323	strerror(saved_errno));
4c505f71 PA	324	close(sockfd);
	325	sockfd = -1;
	326	continue;
	327	}
ba505322 AR	328	if (flags & CONNECT_VERBOSE)
	329	fprintf(stderr, "%s ",
	330	inet_ntoa((struct in_addr )&sa.sin_addr));
4c505f71 PA	331	break;
	332	}
	333
	334	if (sockfd < 0)
ac3bc6c1	335	die("unable to connect a socket (%s)", strerror(saved_errno));
4c505f71	336
7841ce79 MT	337	if (flags & CONNECT_VERBOSE)
	338	fprintf(stderr, "done.\n");
	339
5ad312be JL	340	return sockfd;
	341	}
	342
	343	#endif /* NO_IPV6 */
	344
	345
7841ce79	346	static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be	347	{
7841ce79	348	int sockfd = git_tcp_connect_sock(host, flags);
5ad312be	349
4c505f71	350	fd[0] = sockfd;
ec587fde	351	fd[1] = dup(sockfd);
4c505f71 PA	352	}
4c505f71 PA	353
4c505f71	354
96f1e58f DR	355	static char *git_proxy_command;
96f1e58f DR	356	static const char *rhost_name;
e814bc4d	357	static int rhost_len;
f8014776 PC	358
	359	static int git_proxy_command_options(const char var, const char value)
	360	{
e814bc4d	361	if (!strcmp(var, "core.gitproxy")) {
c3df8568 YH	362	const char *for_pos;
	363	int matchlen = -1;
	364	int hostlen;
	365
e814bc4d	366	if (git_proxy_command)
f8014776	367	return 0;
e814bc4d JH	368	/* [core]
	369	* ;# matches www.kernel.org as well
	370	* gitproxy = netcatter-1 for kernel.org
	371	* gitproxy = netcatter-2 for sample.xz
	372	* gitproxy = netcatter-default
	373	*/
c3df8568	374	for_pos = strstr(value, " for ");
e814bc4d JH	375	if (!for_pos)
	376	/* matches everybody */
	377	matchlen = strlen(value);
	378	else {
	379	hostlen = strlen(for_pos + 5);
	380	if (rhost_len < hostlen)
	381	matchlen = -1;
	382	else if (!strncmp(for_pos + 5,
	383	rhost_name + rhost_len - hostlen,
	384	hostlen) &&
	385	((rhost_len == hostlen) \|\|
	386	rhost_name[rhost_len - hostlen -1] == '.'))
	387	matchlen = for_pos - value;
	388	else
	389	matchlen = -1;
	390	}
	391	if (0 <= matchlen) {
	392	/* core.gitproxy = none for kernel.org */
a6080a0a	393	if (matchlen == 4 &&
e814bc4d JH	394	!memcmp(value, "none", 4))
	395	matchlen = 0;
	396	git_proxy_command = xmalloc(matchlen + 1);
	397	memcpy(git_proxy_command, value, matchlen);
	398	git_proxy_command[matchlen] = 0;
f8014776	399	}
e814bc4d	400	return 0;
f8014776 PC	401	}
	402
	403	return git_default_config(var, value);
	404	}
	405
e814bc4d	406	static int git_use_proxy(const char *host)
f8014776	407	{
e814bc4d JH	408	rhost_name = host;
e814bc4d JH	409	rhost_len = strlen(host);
f8014776 PC	410	git_proxy_command = getenv("GIT_PROXY_COMMAND");
f8014776 PC	411	git_config(git_proxy_command_options);
e814bc4d JH	412	rhost_name = NULL;
e814bc4d JH	413	return (git_proxy_command && *git_proxy_command);
f8014776 PC	414	}
f8014776 PC	415
c78963d2	416	static void git_proxy_connect(int fd[2], char *host)
f8014776	417	{
554fe20d	418	const char *port = STR(DEFAULT_GIT_PORT);
f8014776	419	char colon, end;
15a1c012 SP	420	const char *argv[4];
15a1c012 SP	421	struct child_process proxy;
f8014776 PC	422
	423	if (host[0] == '[') {
	424	end = strchr(host + 1, ']');
	425	if (end) {
	426	*end = 0;
	427	end++;
	428	host++;
	429	} else
	430	end = host;
	431	} else
	432	end = host;
	433	colon = strchr(end, ':');
	434
	435	if (colon) {
	436	*colon = 0;
	437	port = colon + 1;
	438	}
	439
15a1c012 SP	440	argv[0] = git_proxy_command;
	441	argv[1] = host;
	442	argv[2] = port;
	443	argv[3] = NULL;
	444	memset(&proxy, 0, sizeof(proxy));
	445	proxy.argv = argv;
	446	proxy.in = -1;
	447	proxy.out = -1;
	448	if (start_command(&proxy))
	449	die("cannot start proxy %s", argv[0]);
	450	fd[0] = proxy.out; /* read from proxy stdout */
	451	fd[1] = proxy.in; /* write to proxy stdin */
f8014776 PC	452	}
f8014776 PC	453
0f503d77 CC	454	#define MAX_CMD_LEN 1024
0f503d77 CC	455
f7192598	456	/*
f42a5c4e FBH	457	* This returns 0 if the transport protocol does not need fork(2),
	458	* or a process id if it does. Once done, finish the connection
	459	* with finish_connect() with the value returned from this function
	460	* (it is safe to call finish_connect() with 0 to support the former
	461	* case).
	462	*
	463	* Does not return a negative value on error; it just dies.
f7192598	464	*/
7841ce79	465	pid_t git_connect(int fd[2], char url, const char prog, int flags)
f7192598	466	{
faea9ccb	467	char host, path = url;
356bece0 YH	468	char *end;
356bece0 YH	469	int c;
f7192598 LT	470	int pipefd[2][2];
f7192598 LT	471	pid_t pid;
faea9ccb	472	enum protocol protocol = PROTO_LOCAL;
da2a95b2	473	int free_path = 0;
faea9ccb	474
f0b7367c JH	475	/* Without this we cannot rely on waitpid() to tell
	476	* what happened to our children.
	477	*/
	478	signal(SIGCHLD, SIG_DFL);
	479
faea9ccb AE	480	host = strstr(url, "://");
	481	if(host) {
	482	*host = '\0';
	483	protocol = get_protocol(url);
	484	host += 3;
356bece0 YH	485	c = '/';
356bece0 YH	486	} else {
f7192598	487	host = url;
356bece0 YH	488	c = ':';
	489	}
	490
	491	if (host[0] == '[') {
	492	end = strchr(host + 1, ']');
	493	if (end) {
	494	*end = 0;
	495	end++;
	496	host++;
	497	} else
	498	end = host;
	499	} else
	500	end = host;
	501
	502	path = strchr(end, c);
72a4f4b6 LT	503	if (path) {
72a4f4b6 LT	504	if (c == ':') {
faea9ccb	505	protocol = PROTO_SSH;
356bece0	506	*path++ = '\0';
72a4f4b6 LT	507	}
	508	} else
	509	path = end;
2386d658	510
faea9ccb AE	511	if (!path \|\| !*path)
	512	die("No path specified. See 'man git-pull' for valid url syntax");
	513
	514	/*
	515	* null-terminate hostname and point path to ~ for URL's like this:
	516	* ssh://host.xz/~user/repo
	517	*/
	518	if (protocol != PROTO_LOCAL && host != url) {
	519	char *ptr = path;
	520	if (path[1] == '~')
	521	path++;
da2a95b2	522	else {
9befac47	523	path = xstrdup(ptr);
da2a95b2 SH	524	free_path = 1;
da2a95b2 SH	525	}
faea9ccb AE	526
	527	*ptr = '\0';
	528	}
	529
f8014776	530	if (protocol == PROTO_GIT) {
5ad312be JL	531	/* These underlying connection commands die() if they
	532	* cannot connect.
	533	*/
9befac47	534	char *target_host = xstrdup(host);
e814bc4d	535	if (git_use_proxy(host))
c78963d2	536	git_proxy_connect(fd, host);
da2a95b2	537	else
7841ce79	538	git_tcp_connect(fd, host, flags);
5ad312be JL	539	/*
	540	* Separate original protocol components prog and path
	541	* from extended components with a NUL byte.
	542	*/
	543	packet_write(fd[1],
	544	"%s %s%chost=%s%c",
	545	prog, path, 0,
	546	target_host, 0);
	547	free(target_host);
da2a95b2 SH	548	if (free_path)
da2a95b2 SH	549	free(path);
5ad312be	550	return 0;
f8014776	551	}
2386d658	552
f7192598 LT	553	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	554	die("unable to create pipe pair for communication");
	555	pid = fork();
c9bc159d PD	556	if (pid < 0)
c9bc159d PD	557	die("unable to fork");
f7192598	558	if (!pid) {
0f503d77 CC	559	char command[MAX_CMD_LEN];
	560	char *posn = command;
	561	int size = MAX_CMD_LEN;
	562	int of = 0;
	563
	564	of \|= add_to_string(&posn, &size, prog, 0);
	565	of \|= add_to_string(&posn, &size, " ", 0);
	566	of \|= add_to_string(&posn, &size, path, 1);
	567
	568	if (of)
	569	die("command line too long");
	570
f7192598 LT	571	dup2(pipefd[1][0], 0);
	572	dup2(pipefd[0][1], 1);
	573	close(pipefd[0][0]);
	574	close(pipefd[0][1]);
	575	close(pipefd[1][0]);
	576	close(pipefd[1][1]);
4852f723	577	if (protocol == PROTO_SSH) {
c7c81b3a JR	578	const char ssh, ssh_basename;
	579	ssh = getenv("GIT_SSH");
	580	if (!ssh) ssh = "ssh";
	581	ssh_basename = strrchr(ssh, '/');
4852f723 MS	582	if (!ssh_basename)
	583	ssh_basename = ssh;
	584	else
	585	ssh_basename++;
	586	execlp(ssh, ssh_basename, host, command, NULL);
	587	}
016fb48b MD	588	else {
	589	unsetenv(ALTERNATE_DB_ENVIRONMENT);
	590	unsetenv(DB_ENVIRONMENT);
	591	unsetenv(GIT_DIR_ENVIRONMENT);
892c41b9	592	unsetenv(GIT_WORK_TREE_ENVIRONMENT);
016fb48b MD	593	unsetenv(GRAFT_ENVIRONMENT);
016fb48b MD	594	unsetenv(INDEX_ENVIRONMENT);
f7192598	595	execlp("sh", "sh", "-c", command, NULL);
016fb48b	596	}
f7192598	597	die("exec failed");
016fb48b	598	}
f7192598 LT	599	fd[0] = pipefd[0][0];
	600	fd[1] = pipefd[1][1];
	601	close(pipefd[0][1]);
	602	close(pipefd[1][0]);
da2a95b2 SH	603	if (free_path)
da2a95b2 SH	604	free(path);
f7192598 LT	605	return pid;
	606	}
	607
	608	int finish_connect(pid_t pid)
	609	{
f42a5c4e FBH	610	if (pid == 0)
	611	return 0;
	612
53e1a761	613	while (waitpid(pid, NULL, 0) < 0) {
f7192598	614	if (errno != EINTR)
53e1a761	615	return -1;
f7192598	616	}
53e1a761	617	return 0;
f7192598	618	}