[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;
	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 (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 = 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;
2386d658 LT	148	die("I don't handle protocol '%s'", name);
	149	}
	150
5ba88448 YH	151	#define STR_(s) # s
5ba88448 YH	152	#define STR(s) STR_(s)
2386d658	153
49744d63	154	#ifndef NO_IPV6
4c505f71	155
ba505322 AR	156	static const char ai_name(const struct addrinfo ai)
	157	{
	158	static char addr[INET_ADDRSTRLEN];
	159	if ( AF_INET == ai->ai_family ) {
	160	struct sockaddr_in *in;
	161	in = (struct sockaddr_in *)ai->ai_addr;
	162	inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
	163	} else if ( AF_INET6 == ai->ai_family ) {
	164	struct sockaddr_in6 *in;
	165	in = (struct sockaddr_in6 *)ai->ai_addr;
	166	inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
	167	} else {
	168	strcpy(addr, "(unknown)");
	169	}
	170	return addr;
	171	}
	172
5ad312be JL	173	/*
	174	* Returns a connected socket() fd, or else die()s.
	175	*/
7841ce79	176	static int git_tcp_connect_sock(char *host, int flags)
2386d658	177	{
ac3bc6c1	178	int sockfd = -1, saved_errno = 0;
5ba88448	179	char colon, end;
554fe20d	180	const char *port = STR(DEFAULT_GIT_PORT);
5ba88448 YH	181	struct addrinfo hints, ai0, ai;
5ba88448 YH	182	int gai;
ba505322	183	int cnt = 0;
5ba88448 YH	184
	185	if (host[0] == '[') {
	186	end = strchr(host + 1, ']');
	187	if (end) {
	188	*end = 0;
	189	end++;
	190	host++;
	191	} else
	192	end = host;
	193	} else
	194	end = host;
	195	colon = strchr(end, ':');
	196
ce6f8e7e LT	197	if (colon) {
ce6f8e7e LT	198	*colon = 0;
5ba88448	199	port = colon + 1;
608d48b2 LT	200	if (!*port)
608d48b2 LT	201	port = "<none>";
ce6f8e7e	202	}
5ba88448 YH	203
	204	memset(&hints, 0, sizeof(hints));
	205	hints.ai_socktype = SOCK_STREAM;
	206	hints.ai_protocol = IPPROTO_TCP;
	207
7841ce79 MT	208	if (flags & CONNECT_VERBOSE)
	209	fprintf(stderr, "Looking up %s ... ", host);
	210
5ba88448 YH	211	gai = getaddrinfo(host, port, &hints, &ai);
5ba88448 YH	212	if (gai)
608d48b2	213	die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
5ba88448	214
7841ce79 MT	215	if (flags & CONNECT_VERBOSE)
	216	fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
	217
5ba88448	218	for (ai0 = ai; ai; ai = ai->ai_next) {
5ad312be JL	219	sockfd = socket(ai->ai_family,
5ad312be JL	220	ai->ai_socktype, ai->ai_protocol);
ac3bc6c1 PB	221	if (sockfd < 0) {
ac3bc6c1 PB	222	saved_errno = errno;
5ba88448	223	continue;
ac3bc6c1	224	}
5ba88448	225	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
ac3bc6c1	226	saved_errno = errno;
7cbf2f24	227	fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322 AR	228	host,
	229	cnt,
	230	ai_name(ai),
ba505322	231	strerror(saved_errno));
5ba88448 YH	232	close(sockfd);
	233	sockfd = -1;
	234	continue;
2386d658	235	}
ba505322 AR	236	if (flags & CONNECT_VERBOSE)
ba505322 AR	237	fprintf(stderr, "%s ", ai_name(ai));
5ba88448	238	break;
2386d658 LT	239	}
2386d658 LT	240
5ba88448	241	freeaddrinfo(ai0);
2386d658	242
2386d658	243	if (sockfd < 0)
ac3bc6c1	244	die("unable to connect a socket (%s)", strerror(saved_errno));
5ba88448	245
7841ce79 MT	246	if (flags & CONNECT_VERBOSE)
	247	fprintf(stderr, "done.\n");
	248
5ad312be	249	return sockfd;
2386d658 LT	250	}
2386d658 LT	251
49744d63	252	#else /* NO_IPV6 */
4c505f71	253
5ad312be JL	254	/*
	255	* Returns a connected socket() fd, or else die()s.
	256	*/
7841ce79	257	static int git_tcp_connect_sock(char *host, int flags)
4c505f71	258	{
ac3bc6c1	259	int sockfd = -1, saved_errno = 0;
4c505f71 PA	260	char colon, end;
	261	char port = STR(DEFAULT_GIT_PORT), ep;
	262	struct hostent *he;
	263	struct sockaddr_in sa;
	264	char **ap;
	265	unsigned int nport;
ba505322	266	int cnt;
4c505f71 PA	267
	268	if (host[0] == '[') {
	269	end = strchr(host + 1, ']');
	270	if (end) {
	271	*end = 0;
	272	end++;
	273	host++;
	274	} else
	275	end = host;
	276	} else
	277	end = host;
	278	colon = strchr(end, ':');
	279
	280	if (colon) {
	281	*colon = 0;
	282	port = colon + 1;
	283	}
	284
7841ce79 MT	285	if (flags & CONNECT_VERBOSE)
	286	fprintf(stderr, "Looking up %s ... ", host);
	287
4c505f71 PA	288	he = gethostbyname(host);
	289	if (!he)
	290	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	291	nport = strtoul(port, &ep, 10);
	292	if ( ep == port \|\| *ep ) {
	293	/* Not numeric */
	294	struct servent *se = getservbyname(port,"tcp");
	295	if ( !se )
	296	die("Unknown port %s\n", port);
	297	nport = se->s_port;
	298	}
	299
7841ce79 MT	300	if (flags & CONNECT_VERBOSE)
	301	fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
	302
ba505322	303	for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
4c505f71	304	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
ac3bc6c1 PB	305	if (sockfd < 0) {
ac3bc6c1 PB	306	saved_errno = errno;
4c505f71	307	continue;
ac3bc6c1	308	}
4c505f71 PA	309
	310	memset(&sa, 0, sizeof sa);
	311	sa.sin_family = he->h_addrtype;
6573faff	312	sa.sin_port = htons(nport);
c6164218	313	memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 PA	314
4c505f71 PA	315	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
ac3bc6c1	316	saved_errno = errno;
7cbf2f24	317	fprintf(stderr, "%s[%d: %s]: errno=%s\n",
ba505322 AR	318	host,
	319	cnt,
	320	inet_ntoa((struct in_addr )&sa.sin_addr),
ba505322	321	strerror(saved_errno));
4c505f71 PA	322	close(sockfd);
	323	sockfd = -1;
	324	continue;
	325	}
ba505322 AR	326	if (flags & CONNECT_VERBOSE)
	327	fprintf(stderr, "%s ",
	328	inet_ntoa((struct in_addr )&sa.sin_addr));
4c505f71 PA	329	break;
	330	}
	331
	332	if (sockfd < 0)
ac3bc6c1	333	die("unable to connect a socket (%s)", strerror(saved_errno));
4c505f71	334
7841ce79 MT	335	if (flags & CONNECT_VERBOSE)
	336	fprintf(stderr, "done.\n");
	337
5ad312be JL	338	return sockfd;
	339	}
	340
	341	#endif /* NO_IPV6 */
	342
	343
7841ce79	344	static void git_tcp_connect(int fd[2], char *host, int flags)
5ad312be	345	{
7841ce79	346	int sockfd = git_tcp_connect_sock(host, flags);
5ad312be	347
4c505f71	348	fd[0] = sockfd;
ec587fde	349	fd[1] = dup(sockfd);
4c505f71 PA	350	}
4c505f71 PA	351
4c505f71	352
96f1e58f DR	353	static char *git_proxy_command;
96f1e58f DR	354	static const char *rhost_name;
e814bc4d	355	static int rhost_len;
f8014776 PC	356
	357	static int git_proxy_command_options(const char var, const char value)
	358	{
e814bc4d	359	if (!strcmp(var, "core.gitproxy")) {
c3df8568 YH	360	const char *for_pos;
	361	int matchlen = -1;
	362	int hostlen;
	363
e814bc4d	364	if (git_proxy_command)
f8014776	365	return 0;
e814bc4d JH	366	/* [core]
	367	* ;# matches www.kernel.org as well
	368	* gitproxy = netcatter-1 for kernel.org
	369	* gitproxy = netcatter-2 for sample.xz
	370	* gitproxy = netcatter-default
	371	*/
c3df8568	372	for_pos = strstr(value, " for ");
e814bc4d JH	373	if (!for_pos)
	374	/* matches everybody */
	375	matchlen = strlen(value);
	376	else {
	377	hostlen = strlen(for_pos + 5);
	378	if (rhost_len < hostlen)
	379	matchlen = -1;
	380	else if (!strncmp(for_pos + 5,
	381	rhost_name + rhost_len - hostlen,
	382	hostlen) &&
	383	((rhost_len == hostlen) \|\|
	384	rhost_name[rhost_len - hostlen -1] == '.'))
	385	matchlen = for_pos - value;
	386	else
	387	matchlen = -1;
	388	}
	389	if (0 <= matchlen) {
	390	/* core.gitproxy = none for kernel.org */
a6080a0a	391	if (matchlen == 4 &&
e814bc4d JH	392	!memcmp(value, "none", 4))
	393	matchlen = 0;
	394	git_proxy_command = xmalloc(matchlen + 1);
	395	memcpy(git_proxy_command, value, matchlen);
	396	git_proxy_command[matchlen] = 0;
f8014776	397	}
e814bc4d	398	return 0;
f8014776 PC	399	}
	400
	401	return git_default_config(var, value);
	402	}
	403
e814bc4d	404	static int git_use_proxy(const char *host)
f8014776	405	{
e814bc4d JH	406	rhost_name = host;
e814bc4d JH	407	rhost_len = strlen(host);
f8014776 PC	408	git_proxy_command = getenv("GIT_PROXY_COMMAND");
f8014776 PC	409	git_config(git_proxy_command_options);
e814bc4d JH	410	rhost_name = NULL;
e814bc4d JH	411	return (git_proxy_command && *git_proxy_command);
f8014776 PC	412	}
f8014776 PC	413
c78963d2	414	static void git_proxy_connect(int fd[2], char *host)
f8014776	415	{
554fe20d	416	const char *port = STR(DEFAULT_GIT_PORT);
f8014776	417	char colon, end;
15a1c012 SP	418	const char *argv[4];
15a1c012 SP	419	struct child_process proxy;
f8014776 PC	420
	421	if (host[0] == '[') {
	422	end = strchr(host + 1, ']');
	423	if (end) {
	424	*end = 0;
	425	end++;
	426	host++;
	427	} else
	428	end = host;
	429	} else
	430	end = host;
	431	colon = strchr(end, ':');
	432
	433	if (colon) {
	434	*colon = 0;
	435	port = colon + 1;
	436	}
	437
15a1c012 SP	438	argv[0] = git_proxy_command;
	439	argv[1] = host;
	440	argv[2] = port;
	441	argv[3] = NULL;
	442	memset(&proxy, 0, sizeof(proxy));
	443	proxy.argv = argv;
	444	proxy.in = -1;
	445	proxy.out = -1;
	446	if (start_command(&proxy))
	447	die("cannot start proxy %s", argv[0]);
	448	fd[0] = proxy.out; /* read from proxy stdout */
	449	fd[1] = proxy.in; /* write to proxy stdin */
f8014776 PC	450	}
f8014776 PC	451
0f503d77 CC	452	#define MAX_CMD_LEN 1024
0f503d77 CC	453
f7192598	454	/*
f42a5c4e FBH	455	* This returns 0 if the transport protocol does not need fork(2),
	456	* or a process id if it does. Once done, finish the connection
	457	* with finish_connect() with the value returned from this function
	458	* (it is safe to call finish_connect() with 0 to support the former
	459	* case).
	460	*
	461	* Does not return a negative value on error; it just dies.
f7192598	462	*/
7841ce79	463	pid_t git_connect(int fd[2], char url, const char prog, int flags)
f7192598	464	{
faea9ccb	465	char host, path = url;
356bece0 YH	466	char *end;
356bece0 YH	467	int c;
f7192598 LT	468	int pipefd[2][2];
f7192598 LT	469	pid_t pid;
faea9ccb	470	enum protocol protocol = PROTO_LOCAL;
da2a95b2	471	int free_path = 0;
faea9ccb	472
f0b7367c JH	473	/* Without this we cannot rely on waitpid() to tell
	474	* what happened to our children.
	475	*/
	476	signal(SIGCHLD, SIG_DFL);
	477
faea9ccb AE	478	host = strstr(url, "://");
	479	if(host) {
	480	*host = '\0';
	481	protocol = get_protocol(url);
	482	host += 3;
356bece0 YH	483	c = '/';
356bece0 YH	484	} else {
f7192598	485	host = url;
356bece0 YH	486	c = ':';
	487	}
	488
	489	if (host[0] == '[') {
	490	end = strchr(host + 1, ']');
	491	if (end) {
	492	*end = 0;
	493	end++;
	494	host++;
	495	} else
	496	end = host;
	497	} else
	498	end = host;
	499
	500	path = strchr(end, c);
	501	if (c == ':') {
	502	if (path) {
faea9ccb	503	protocol = PROTO_SSH;
356bece0 YH	504	*path++ = '\0';
	505	} else
	506	path = host;
f7192598	507	}
2386d658	508
faea9ccb AE	509	if (!path \|\| !*path)
	510	die("No path specified. See 'man git-pull' for valid url syntax");
	511
	512	/*
	513	* null-terminate hostname and point path to ~ for URL's like this:
	514	* ssh://host.xz/~user/repo
	515	*/
	516	if (protocol != PROTO_LOCAL && host != url) {
	517	char *ptr = path;
	518	if (path[1] == '~')
	519	path++;
da2a95b2	520	else {
9befac47	521	path = xstrdup(ptr);
da2a95b2 SH	522	free_path = 1;
da2a95b2 SH	523	}
faea9ccb AE	524
	525	*ptr = '\0';
	526	}
	527
f8014776	528	if (protocol == PROTO_GIT) {
5ad312be JL	529	/* These underlying connection commands die() if they
	530	* cannot connect.
	531	*/
9befac47	532	char *target_host = xstrdup(host);
e814bc4d	533	if (git_use_proxy(host))
c78963d2	534	git_proxy_connect(fd, host);
da2a95b2	535	else
7841ce79	536	git_tcp_connect(fd, host, flags);
5ad312be JL	537	/*
	538	* Separate original protocol components prog and path
	539	* from extended components with a NUL byte.
	540	*/
	541	packet_write(fd[1],
	542	"%s %s%chost=%s%c",
	543	prog, path, 0,
	544	target_host, 0);
	545	free(target_host);
da2a95b2 SH	546	if (free_path)
da2a95b2 SH	547	free(path);
5ad312be	548	return 0;
f8014776	549	}
2386d658	550
f7192598 LT	551	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	552	die("unable to create pipe pair for communication");
	553	pid = fork();
c9bc159d PD	554	if (pid < 0)
c9bc159d PD	555	die("unable to fork");
f7192598	556	if (!pid) {
0f503d77 CC	557	char command[MAX_CMD_LEN];
	558	char *posn = command;
	559	int size = MAX_CMD_LEN;
	560	int of = 0;
	561
	562	of \|= add_to_string(&posn, &size, prog, 0);
	563	of \|= add_to_string(&posn, &size, " ", 0);
	564	of \|= add_to_string(&posn, &size, path, 1);
	565
	566	if (of)
	567	die("command line too long");
	568
f7192598 LT	569	dup2(pipefd[1][0], 0);
	570	dup2(pipefd[0][1], 1);
	571	close(pipefd[0][0]);
	572	close(pipefd[0][1]);
	573	close(pipefd[1][0]);
	574	close(pipefd[1][1]);
4852f723	575	if (protocol == PROTO_SSH) {
c7c81b3a JR	576	const char ssh, ssh_basename;
	577	ssh = getenv("GIT_SSH");
	578	if (!ssh) ssh = "ssh";
	579	ssh_basename = strrchr(ssh, '/');
4852f723 MS	580	if (!ssh_basename)
	581	ssh_basename = ssh;
	582	else
	583	ssh_basename++;
	584	execlp(ssh, ssh_basename, host, command, NULL);
	585	}
016fb48b MD	586	else {
	587	unsetenv(ALTERNATE_DB_ENVIRONMENT);
	588	unsetenv(DB_ENVIRONMENT);
	589	unsetenv(GIT_DIR_ENVIRONMENT);
892c41b9	590	unsetenv(GIT_WORK_TREE_ENVIRONMENT);
016fb48b MD	591	unsetenv(GRAFT_ENVIRONMENT);
016fb48b MD	592	unsetenv(INDEX_ENVIRONMENT);
f7192598	593	execlp("sh", "sh", "-c", command, NULL);
016fb48b	594	}
f7192598	595	die("exec failed");
016fb48b	596	}
f7192598 LT	597	fd[0] = pipefd[0][0];
	598	fd[1] = pipefd[1][1];
	599	close(pipefd[0][1]);
	600	close(pipefd[1][0]);
da2a95b2 SH	601	if (free_path)
da2a95b2 SH	602	free(path);
f7192598 LT	603	return pid;
	604	}
	605
	606	int finish_connect(pid_t pid)
	607	{
f42a5c4e FBH	608	if (pid == 0)
	609	return 0;
	610
53e1a761	611	while (waitpid(pid, NULL, 0) < 0) {
f7192598	612	if (errno != EINTR)
53e1a761	613	return -1;
f7192598	614	}
53e1a761	615	return 0;
f7192598	616	}