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41 results

fs_use

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  • connect.c 13.69 KiB
    #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"
    #include "url.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_refname_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);
    }
    
    int check_ref_type(const struct ref *ref, int flags)
    {
    	return check_ref(ref->name, strlen(ref->name), flags);
    }
    
    static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
    {
    	ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
    	hashcpy(&(extra->array[extra->nr][0]), sha1);
    	extra->nr++;
    }
    
    /*
     * Read all the refs from the other end
     */
    struct ref **get_remote_heads(int in, struct ref **list,
    			      unsigned int flags,
    			      struct extra_have_objects *extra_have)
    {
    	*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 > 4 && !prefixcmp(buffer, "ERR "))
    			die("remote error: %s", buffer + 4);
    
    		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) {
    			free(server_capabilities);
    			server_capabilities = xstrdup(name + name_len + 1);
    		}
    
    		if (extra_have &&
    		    name_len == 5 && !memcmp(".have", name, 5)) {
    			add_extra_have(extra_have, old_sha1);
    			continue;
    		}
    
    		if (!check_ref(name, name_len, flags))
    			continue;
    		ref = alloc_ref(buffer + 41);
    		hashcpy(ref->old_sha1, old_sha1);
    		*list = ref;
    		list = &ref->next;
    	}
    	return list;
    }
    
    int server_supports(const char *feature)
    {
    	return !!parse_feature_request(server_capabilities, feature);
    }
    
    const char *parse_feature_request(const char *feature_list, const char *feature)
    {
    	int len;
    
    	if (!feature_list)
    		return NULL;
    
    	len = strlen(feature);
    	while (*feature_list) {
    		const char *found = strstr(feature_list, feature);
    		if (!found)
    			return NULL;
    		if ((feature_list == found || isspace(found[-1])) &&
    		    (!found[len] || isspace(found[len]) || found[len] == '='))
    			return found;
    		feature_list = found + 1;
    	}
    	return NULL;
    }
    
    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)
    
    static void get_host_and_port(char **host, const char **port)
    {
    	char *colon, *end;
    
    	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;
    	}
    }
    
    static void enable_keepalive(int sockfd)
    {
    	int ka = 1;
    
    	if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
    		fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
    			strerror(errno));
    }
    
    #ifndef NO_IPV6
    
    static const char *ai_name(const struct addrinfo *ai)
    {
    	static char addr[NI_MAXHOST];
    	if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
    			NI_NUMERICHOST) != 0)
    		strcpy(addr, "(unknown)");
    
    	return addr;
    }
    
    /*
     * Returns a connected socket() fd, or else die()s.
     */
    static int git_tcp_connect_sock(char *host, int flags)
    {
    	struct strbuf error_message = STRBUF_INIT;
    	int sockfd = -1;
    	const char *port = STR(DEFAULT_GIT_PORT);
    	struct addrinfo hints, *ai0, *ai;
    	int gai;
    	int cnt = 0;
    
    	get_host_and_port(&host, &port);
    	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, cnt++) {
    		sockfd = socket(ai->ai_family,
    				ai->ai_socktype, ai->ai_protocol);
    		if ((sockfd < 0) ||
    		    (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
    			strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
    				    host, cnt, ai_name(ai), strerror(errno));
    			if (0 <= sockfd)
    				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 to %s:\n%s", host, error_message.buf);
    
    	enable_keepalive(sockfd);
    
    	if (flags & CONNECT_VERBOSE)
    		fprintf(stderr, "done.\n");
    
    	strbuf_release(&error_message);
    
    	return sockfd;
    }
    
    #else /* NO_IPV6 */
    
    /*
     * Returns a connected socket() fd, or else die()s.
     */
    static int git_tcp_connect_sock(char *host, int flags)
    {
    	struct strbuf error_message = STRBUF_INIT;
    	int sockfd = -1;
    	const char *port = STR(DEFAULT_GIT_PORT);
    	char *ep;
    	struct hostent *he;
    	struct sockaddr_in sa;
    	char **ap;
    	unsigned int nport;
    	int cnt;
    
    	get_host_and_port(&host, &port);
    
    	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", 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++) {
    		memset(&sa, 0, sizeof sa);
    		sa.sin_family = he->h_addrtype;
    		sa.sin_port = htons(nport);
    		memcpy(&sa.sin_addr, *ap, he->h_length);
    
    		sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
    		if ((sockfd < 0) ||
    		    connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
    			strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
    				host,
    				cnt,
    				inet_ntoa(*(struct in_addr *)&sa.sin_addr),
    				strerror(errno));
    			if (0 <= sockfd)
    				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 to %s:\n%s", host, error_message.buf);
    
    	enable_keepalive(sockfd);
    
    	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 int git_proxy_command_options(const char *var, const char *value,
    		void *cb)
    {
    	if (!strcmp(var, "core.gitproxy")) {
    		const char *for_pos;
    		int matchlen = -1;
    		int hostlen;
    		const char *rhost_name = cb;
    		int rhost_len = strlen(rhost_name);
    
    		if (git_proxy_command)
    			return 0;
    		if (!value)
    			return config_error_nonbool(var);
    		/* [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 = xmemdupz(value, matchlen);
    		}
    		return 0;
    	}
    
    	return git_default_config(var, value, cb);
    }
    
    static int git_use_proxy(const char *host)
    {
    	git_proxy_command = getenv("GIT_PROXY_COMMAND");
    	git_config(git_proxy_command_options, (void*)host);
    	return (git_proxy_command && *git_proxy_command);
    }
    
    static struct child_process *git_proxy_connect(int fd[2], char *host)
    {
    	const char *port = STR(DEFAULT_GIT_PORT);
    	const char **argv;
    	struct child_process *proxy;
    
    	get_host_and_port(&host, &port);
    
    	argv = xmalloc(sizeof(*argv) * 4);
    	argv[0] = git_proxy_command;
    	argv[1] = host;
    	argv[2] = port;
    	argv[3] = NULL;
    	proxy = xcalloc(1, 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 */
    	return proxy;
    }
    
    #define MAX_CMD_LEN 1024
    
    static char *get_port(char *host)
    {
    	char *end;
    	char *p = strchr(host, ':');
    
    	if (p) {
    		long port = strtol(p + 1, &end, 10);
    		if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
    			*p = '\0';
    			return p+1;
    		}
    	}
    
    	return NULL;
    }
    
    static struct child_process no_fork;
    
    /*
     * This returns a dummy child_process if the transport protocol does not
     * need fork(2), or a struct child_process object 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 NULL to support
     * the former case).
     *
     * If it returns, the connect is successful; it just dies on errors (this
     * will hopefully be changed in a libification effort, to return NULL when
     * the connection failed).
     */
    struct child_process *git_connect(int fd[2], const char *url_orig,
    				  const char *prog, int flags)
    {
    	char *url;
    	char *host, *path;
    	char *end;
    	int c;
    	struct child_process *conn = &no_fork;
    	enum protocol protocol = PROTO_LOCAL;
    	int free_path = 0;
    	char *port = NULL;
    	const char **arg;
    	struct strbuf cmd;
    
    	/* Without this we cannot rely on waitpid() to tell
    	 * what happened to our children.
    	 */
    	signal(SIGCHLD, SIG_DFL);
    
    	if (is_url(url_orig))
    		url = url_decode(url_orig);
    	else
    		url = xstrdup(url_orig);
    
    	host = strstr(url, "://");
    	if (host) {
    		*host = '\0';
    		protocol = get_protocol(url);
    		host += 3;
    		c = '/';
    	} else {
    		host = url;
    		c = ':';
    	}
    
    	/*
    	 * Don't do destructive transforms with git:// as that
    	 * protocol code does '[]' unwrapping of its own.
    	 */
    	if (host[0] == '[') {
    		end = strchr(host + 1, ']');
    		if (end) {
    			if (protocol != PROTO_GIT) {
    				*end = 0;
    				host++;
    			}
    			end++;
    		} else
    			end = host;
    	} else
    		end = host;
    
    	path = strchr(end, c);
    	if (path && !has_dos_drive_prefix(end)) {
    		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';
    	}
    
    	/*
    	 * Add support for ssh port: ssh://host.xy:<port>/...
    	 */
    	if (protocol == PROTO_SSH && host != url)
    		port = get_port(host);
    
    	if (protocol == PROTO_GIT) {
    		/* These underlying connection commands die() if they
    		 * cannot connect.
    		 */
    		char *target_host = xstrdup(host);
    		if (git_use_proxy(host))
    			conn = git_proxy_connect(fd, host);
    		else
    			git_tcp_connect(fd, host, flags);
    		/*
    		 * Separate original protocol components prog and path
    		 * from extended host header with a NUL byte.
    		 *
    		 * Note: Do not add any other headers here!  Doing so
    		 * will cause older git-daemon servers to crash.
    		 */
    		packet_write(fd[1],
    			     "%s %s%chost=%s%c",
    			     prog, path, 0,
    			     target_host, 0);
    		free(target_host);
    		free(url);
    		if (free_path)
    			free(path);
    		return conn;
    	}
    
    	conn = xcalloc(1, sizeof(*conn));
    
    	strbuf_init(&cmd, MAX_CMD_LEN);
    	strbuf_addstr(&cmd, prog);
    	strbuf_addch(&cmd, ' ');
    	sq_quote_buf(&cmd, path);
    	if (cmd.len >= MAX_CMD_LEN)
    		die("command line too long");
    
    	conn->in = conn->out = -1;
    	conn->argv = arg = xcalloc(7, sizeof(*arg));
    	if (protocol == PROTO_SSH) {
    		const char *ssh = getenv("GIT_SSH");
    		int putty = ssh && strcasestr(ssh, "plink");
    		if (!ssh) ssh = "ssh";
    
    		*arg++ = ssh;
    		if (putty && !strcasestr(ssh, "tortoiseplink"))
    			*arg++ = "-batch";
    		if (port) {
    			/* P is for PuTTY, p is for OpenSSH */
    			*arg++ = putty ? "-P" : "-p";
    			*arg++ = port;
    		}
    		*arg++ = host;
    	}
    	else {
    		/* remove repo-local variables from the environment */
    		conn->env = local_repo_env;
    		conn->use_shell = 1;
    	}
    	*arg++ = cmd.buf;
    	*arg = NULL;
    
    	if (start_command(conn))
    		die("unable to fork");
    
    	fd[0] = conn->out; /* read from child's stdout */
    	fd[1] = conn->in;  /* write to child's stdin */
    	strbuf_release(&cmd);
    	free(url);
    	if (free_path)
    		free(path);
    	return conn;
    }
    
    int git_connection_is_socket(struct child_process *conn)
    {
    	return conn == &no_fork;
    }
    
    int finish_connect(struct child_process *conn)
    {
    	int code;
    	if (!conn || git_connection_is_socket(conn))
    		return 0;
    
    	code = finish_command(conn);
    	free(conn->argv);
    	free(conn);
    	return code;
    }