[thirdparty/git.git] / http-backend.c

#include "cache.h"
#include "refs.h"
#include "pkt-line.h"
#include "object.h"
#include "tag.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "string-list.h"

static const char content_type[] = "Content-Type";
static const char content_length[] = "Content-Length";
static const char last_modified[] = "Last-Modified";
static int getanyfile = 1;

static struct string_list *query_params;

struct rpc_service {
	const char *name;
	const char *config_name;
	signed enabled : 2;
};

static struct rpc_service rpc_service[] = {
	{ "upload-pack", "uploadpack", 1 },
	{ "receive-pack", "receivepack", -1 },
};

static int decode_char(const char *q)
{
	int i;
	unsigned char val = 0;
	for (i = 0; i < 2; i++) {
		unsigned char c = *q++;
		val <<= 4;
		if (c >= '0' && c <= '9')
			val += c - '0';
		else if (c >= 'a' && c <= 'f')
			val += c - 'a' + 10;
		else if (c >= 'A' && c <= 'F')
			val += c - 'A' + 10;
		else
			return -1;
	}
	return val;
}

static char *decode_parameter(const char **query, int is_name)
{
	const char *q = *query;
	struct strbuf out;

	strbuf_init(&out, 16);
	do {
		unsigned char c = *q;

		if (!c)
			break;
		if (c == '&' || (is_name && c == '=')) {
			q++;
			break;
		}

		if (c == '%') {
			int val = decode_char(q + 1);
			if (0 <= val) {
				strbuf_addch(&out, val);
				q += 3;
				continue;
			}
		}

		if (c == '+')
			strbuf_addch(&out, ' ');
		else
			strbuf_addch(&out, c);
		q++;
	} while (1);
	*query = q;
	return strbuf_detach(&out, NULL);
}

static struct string_list *get_parameters(void)
{
	if (!query_params) {
		const char *query = getenv("QUERY_STRING");

		query_params = xcalloc(1, sizeof(*query_params));
		while (query && *query) {
			char *name = decode_parameter(&query, 1);
			char *value = decode_parameter(&query, 0);
			struct string_list_item *i;

			i = string_list_lookup(name, query_params);
			if (!i)
				i = string_list_insert(name, query_params);
			else
				free(i->util);
			i->util = value;
		}
	}
	return query_params;
}

static const char *get_parameter(const char *name)
{
	struct string_list_item *i;
	i = string_list_lookup(name, get_parameters());
	return i ? i->util : NULL;
}

__attribute__((format (printf, 2, 3)))
static void format_write(int fd, const char *fmt, ...)
{
	static char buffer[1024];

	va_list args;
	unsigned n;

	va_start(args, fmt);
	n = vsnprintf(buffer, sizeof(buffer), fmt, args);
	va_end(args);
	if (n >= sizeof(buffer))
		die("protocol error: impossibly long line");

	safe_write(fd, buffer, n);
}

static void http_status(unsigned code, const char *msg)
{
	format_write(1, "Status: %u %s\r\n", code, msg);
}

static void hdr_str(const char *name, const char *value)
{
	format_write(1, "%s: %s\r\n", name, value);
}

static void hdr_int(const char *name, uintmax_t value)
{
	format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
}

static void hdr_date(const char *name, unsigned long when)
{
	const char *value = show_date(when, 0, DATE_RFC2822);
	hdr_str(name, value);
}

static void hdr_nocache(void)
{
	hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
	hdr_str("Pragma", "no-cache");
	hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
}

static void hdr_cache_forever(void)
{
	unsigned long now = time(NULL);
	hdr_date("Date", now);
	hdr_date("Expires", now + 31536000);
	hdr_str("Cache-Control", "public, max-age=31536000");
}

static void end_headers(void)
{
	safe_write(1, "\r\n", 2);
}

__attribute__((format (printf, 1, 2)))
static NORETURN void not_found(const char *err, ...)
{
	va_list params;

	http_status(404, "Not Found");
	hdr_nocache();
	end_headers();

	va_start(params, err);
	if (err && *err)
		vfprintf(stderr, err, params);
	va_end(params);
	exit(0);
}

__attribute__((format (printf, 1, 2)))
static NORETURN void forbidden(const char *err, ...)
{
	va_list params;

	http_status(403, "Forbidden");
	hdr_nocache();
	end_headers();

	va_start(params, err);
	if (err && *err)
		vfprintf(stderr, err, params);
	va_end(params);
	exit(0);
}

static void select_getanyfile(void)
{
	if (!getanyfile)
		forbidden("Unsupported service: getanyfile");
}

static void send_strbuf(const char *type, struct strbuf *buf)
{
	hdr_int(content_length, buf->len);
	hdr_str(content_type, type);
	end_headers();
	safe_write(1, buf->buf, buf->len);
}

static void send_local_file(const char *the_type, const char *name)
{
	const char *p = git_path("%s", name);
	size_t buf_alloc = 8192;
	char *buf = xmalloc(buf_alloc);
	int fd;
	struct stat sb;

	fd = open(p, O_RDONLY);
	if (fd < 0)
		not_found("Cannot open '%s': %s", p, strerror(errno));
	if (fstat(fd, &sb) < 0)
		die_errno("Cannot stat '%s'", p);

	hdr_int(content_length, sb.st_size);
	hdr_str(content_type, the_type);
	hdr_date(last_modified, sb.st_mtime);
	end_headers();

	for (;;) {
		ssize_t n = xread(fd, buf, buf_alloc);
		if (n < 0)
			die_errno("Cannot read '%s'", p);
		if (!n)
			break;
		safe_write(1, buf, n);
	}
	close(fd);
	free(buf);
}

static void get_text_file(char *name)
{
	select_getanyfile();
	hdr_nocache();
	send_local_file("text/plain", name);
}

static void get_loose_object(char *name)
{
	select_getanyfile();
	hdr_cache_forever();
	send_local_file("application/x-git-loose-object", name);
}

static void get_pack_file(char *name)
{
	select_getanyfile();
	hdr_cache_forever();
	send_local_file("application/x-git-packed-objects", name);
}

static void get_idx_file(char *name)
{
	select_getanyfile();
	hdr_cache_forever();
	send_local_file("application/x-git-packed-objects-toc", name);
}

static int http_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "http.getanyfile")) {
		getanyfile = git_config_bool(var, value);
		return 0;
	}

	if (!prefixcmp(var, "http.")) {
		int i;

		for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
			struct rpc_service *svc = &rpc_service[i];
			if (!strcmp(var + 5, svc->config_name)) {
				svc->enabled = git_config_bool(var, value);
				return 0;
			}
		}
	}

	/* we are not interested in parsing any other configuration here */
	return 0;
}

static struct rpc_service *select_service(const char *name)
{
	struct rpc_service *svc = NULL;
	int i;

	if (prefixcmp(name, "git-"))
		forbidden("Unsupported service: '%s'", name);

	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
		struct rpc_service *s = &rpc_service[i];
		if (!strcmp(s->name, name + 4)) {
			svc = s;
			break;
		}
	}

	if (!svc)
		forbidden("Unsupported service: '%s'", name);

	if (svc->enabled < 0) {
		const char *user = getenv("REMOTE_USER");
		svc->enabled = (user && *user) ? 1 : 0;
	}
	if (!svc->enabled)
		forbidden("Service not enabled: '%s'", svc->name);
	return svc;
}

static void inflate_request(const char *prog_name, int out)
{
	z_stream stream;
	unsigned char in_buf[8192];
	unsigned char out_buf[8192];
	unsigned long cnt = 0;
	int ret;

	memset(&stream, 0, sizeof(stream));
	ret = inflateInit2(&stream, (15 + 16));
	if (ret != Z_OK)
		die("cannot start zlib inflater, zlib err %d", ret);

	while (1) {
		ssize_t n = xread(0, in_buf, sizeof(in_buf));
		if (n <= 0)
			die("request ended in the middle of the gzip stream");

		stream.next_in = in_buf;
		stream.avail_in = n;

		while (0 < stream.avail_in) {
			int ret;

			stream.next_out = out_buf;
			stream.avail_out = sizeof(out_buf);

			ret = inflate(&stream, Z_NO_FLUSH);
			if (ret != Z_OK && ret != Z_STREAM_END)
				die("zlib error inflating request, result %d", ret);

			n = stream.total_out - cnt;
			if (write_in_full(out, out_buf, n) != n)
				die("%s aborted reading request", prog_name);
			cnt += n;

			if (ret == Z_STREAM_END)
				goto done;
		}
	}

done:
	inflateEnd(&stream);
	close(out);
}

static void run_service(const char **argv)
{
	const char *encoding = getenv("HTTP_CONTENT_ENCODING");
	const char *user = getenv("REMOTE_USER");
	const char *host = getenv("REMOTE_ADDR");
	char *env[3];
	struct strbuf buf = STRBUF_INIT;
	int gzipped_request = 0;
	struct child_process cld;

	if (encoding && !strcmp(encoding, "gzip"))
		gzipped_request = 1;
	else if (encoding && !strcmp(encoding, "x-gzip"))
		gzipped_request = 1;

	if (!user || !*user)
		user = "anonymous";
	if (!host || !*host)
		host = "(none)";

	memset(&env, 0, sizeof(env));
	strbuf_addf(&buf, "GIT_COMMITTER_NAME=%s", user);
	env[0] = strbuf_detach(&buf, NULL);

	strbuf_addf(&buf, "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
	env[1] = strbuf_detach(&buf, NULL);
	env[2] = NULL;

	memset(&cld, 0, sizeof(cld));
	cld.argv = argv;
	cld.env = (const char *const *)env;
	if (gzipped_request)
		cld.in = -1;
	cld.git_cmd = 1;
	if (start_command(&cld))
		exit(1);

	close(1);
	if (gzipped_request)
		inflate_request(argv[0], cld.in);
	else
		close(0);

	if (finish_command(&cld))
		exit(1);
	free(env[0]);
	free(env[1]);
	strbuf_release(&buf);
}

static int show_text_ref(const char *name, const unsigned char *sha1,
	int flag, void *cb_data)
{
	struct strbuf *buf = cb_data;
	struct object *o = parse_object(sha1);
	if (!o)
		return 0;

	strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name);
	if (o->type == OBJ_TAG) {
		o = deref_tag(o, name, 0);
		if (!o)
			return 0;
		strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1), name);
	}
	return 0;
}

static void get_info_refs(char *arg)
{
	const char *service_name = get_parameter("service");
	struct strbuf buf = STRBUF_INIT;

	hdr_nocache();

	if (service_name) {
		const char *argv[] = {NULL /* service name */,
			"--stateless-rpc", "--advertise-refs",
			".", NULL};
		struct rpc_service *svc = select_service(service_name);

		strbuf_addf(&buf, "application/x-git-%s-advertisement",
			svc->name);
		hdr_str(content_type, buf.buf);
		end_headers();

		packet_write(1, "# service=git-%s\n", svc->name);
		packet_flush(1);

		argv[0] = svc->name;
		run_service(argv);

	} else {
		select_getanyfile();
		for_each_ref(show_text_ref, &buf);
		send_strbuf("text/plain", &buf);
	}
	strbuf_release(&buf);
}

static void get_info_packs(char *arg)
{
	size_t objdirlen = strlen(get_object_directory());
	struct strbuf buf = STRBUF_INIT;
	struct packed_git *p;
	size_t cnt = 0;

	select_getanyfile();
	prepare_packed_git();
	for (p = packed_git; p; p = p->next) {
		if (p->pack_local)
			cnt++;
	}

	strbuf_grow(&buf, cnt * 53 + 2);
	for (p = packed_git; p; p = p->next) {
		if (p->pack_local)
			strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
	}
	strbuf_addch(&buf, '\n');

	hdr_nocache();
	send_strbuf("text/plain; charset=utf-8", &buf);
	strbuf_release(&buf);
}

static void check_content_type(const char *accepted_type)
{
	const char *actual_type = getenv("CONTENT_TYPE");

	if (!actual_type)
		actual_type = "";

	if (strcmp(actual_type, accepted_type)) {
		http_status(415, "Unsupported Media Type");
		hdr_nocache();
		end_headers();
		format_write(1,
			"Expected POST with Content-Type '%s',"
			" but received '%s' instead.\n",
			accepted_type, actual_type);
		exit(0);
	}
}

static void service_rpc(char *service_name)
{
	const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
	struct rpc_service *svc = select_service(service_name);
	struct strbuf buf = STRBUF_INIT;

	strbuf_reset(&buf);
	strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
	check_content_type(buf.buf);

	hdr_nocache();

	strbuf_reset(&buf);
	strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
	hdr_str(content_type, buf.buf);

	end_headers();

	argv[0] = svc->name;
	run_service(argv);
	strbuf_release(&buf);
}

static NORETURN void die_webcgi(const char *err, va_list params)
{
	char buffer[1000];

	http_status(500, "Internal Server Error");
	hdr_nocache();
	end_headers();

	vsnprintf(buffer, sizeof(buffer), err, params);
	fprintf(stderr, "fatal: %s\n", buffer);
	exit(0);
}

static char* getdir(void)
{
	struct strbuf buf = STRBUF_INIT;
	char *pathinfo = getenv("PATH_INFO");
	char *root = getenv("GIT_PROJECT_ROOT");
	char *path = getenv("PATH_TRANSLATED");

	if (root && *root) {
		if (!pathinfo || !*pathinfo)
			die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
		if (daemon_avoid_alias(pathinfo))
			die("'%s': aliased", pathinfo);
		strbuf_addstr(&buf, root);
		if (buf.buf[buf.len - 1] != '/')
			strbuf_addch(&buf, '/');
		if (pathinfo[0] == '/')
			pathinfo++;
		strbuf_addstr(&buf, pathinfo);
		return strbuf_detach(&buf, NULL);
	} else if (path && *path) {
		return xstrdup(path);
	} else
		die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
	return NULL;
}

static struct service_cmd {
	const char *method;
	const char *pattern;
	void (*imp)(char *);
} services[] = {
	{"GET", "/HEAD$", get_text_file},
	{"GET", "/info/refs$", get_info_refs},
	{"GET", "/objects/info/alternates$", get_text_file},
	{"GET", "/objects/info/http-alternates$", get_text_file},
	{"GET", "/objects/info/packs$", get_info_packs},
	{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},

	{"POST", "/git-upload-pack$", service_rpc},
	{"POST", "/git-receive-pack$", service_rpc}
};

int main(int argc, char **argv)
{
	char *method = getenv("REQUEST_METHOD");
	char *dir;
	struct service_cmd *cmd = NULL;
	char *cmd_arg = NULL;
	int i;

	git_extract_argv0_path(argv[0]);
	set_die_routine(die_webcgi);

	if (!method)
		die("No REQUEST_METHOD from server");
	if (!strcmp(method, "HEAD"))
		method = "GET";
	dir = getdir();

	for (i = 0; i < ARRAY_SIZE(services); i++) {
		struct service_cmd *c = &services[i];
		regex_t re;
		regmatch_t out[1];

		if (regcomp(&re, c->pattern, REG_EXTENDED))
			die("Bogus regex in service table: %s", c->pattern);
		if (!regexec(&re, dir, 1, out, 0)) {
			size_t n;

			if (strcmp(method, c->method)) {
				const char *proto = getenv("SERVER_PROTOCOL");
				if (proto && !strcmp(proto, "HTTP/1.1"))
					http_status(405, "Method Not Allowed");
				else
					http_status(400, "Bad Request");
				hdr_nocache();
				end_headers();
				return 0;
			}

			cmd = c;
			n = out[0].rm_eo - out[0].rm_so;
			cmd_arg = xmalloc(n);
			memcpy(cmd_arg, dir + out[0].rm_so + 1, n-1);
			cmd_arg[n-1] = '\0';
			dir[out[0].rm_so] = 0;
			break;
		}
		regfree(&re);
	}

	if (!cmd)
		not_found("Request not supported: '%s'", dir);

	setup_path();
	if (!enter_repo(dir, 0))
		not_found("Not a git repository: '%s'", dir);

	git_config(http_config, NULL);
	cmd->imp(cmd_arg);
	return 0;
}
Commit	Line	Data
2f4038ab SP	1	#include "cache.h"
	2	#include "refs.h"
	3	#include "pkt-line.h"
	4	#include "object.h"
	5	#include "tag.h"
	6	#include "exec_cmd.h"
556cfa3b SP	7	#include "run-command.h"
556cfa3b SP	8	#include "string-list.h"
2f4038ab SP	9
	10	static const char content_type[] = "Content-Type";
	11	static const char content_length[] = "Content-Length";
	12	static const char last_modified[] = "Last-Modified";
5abb013b	13	static int getanyfile = 1;
2f4038ab	14
556cfa3b SP	15	static struct string_list *query_params;
	16
	17	struct rpc_service {
	18	const char *name;
	19	const char *config_name;
	20	signed enabled : 2;
	21	};
	22
	23	static struct rpc_service rpc_service[] = {
	24	{ "upload-pack", "uploadpack", 1 },
	25	{ "receive-pack", "receivepack", -1 },
	26	};
	27
	28	static int decode_char(const char *q)
	29	{
	30	int i;
	31	unsigned char val = 0;
	32	for (i = 0; i < 2; i++) {
	33	unsigned char c = *q++;
	34	val <<= 4;
	35	if (c >= '0' && c <= '9')
	36	val += c - '0';
	37	else if (c >= 'a' && c <= 'f')
	38	val += c - 'a' + 10;
	39	else if (c >= 'A' && c <= 'F')
	40	val += c - 'A' + 10;
	41	else
	42	return -1;
	43	}
	44	return val;
	45	}
	46
	47	static char decode_parameter(const char *query, int is_name)
	48	{
	49	const char q = query;
	50	struct strbuf out;
	51
	52	strbuf_init(&out, 16);
	53	do {
	54	unsigned char c = *q;
	55
	56	if (!c)
	57	break;
	58	if (c == '&' \|\| (is_name && c == '=')) {
	59	q++;
	60	break;
	61	}
	62
	63	if (c == '%') {
	64	int val = decode_char(q + 1);
	65	if (0 <= val) {
	66	strbuf_addch(&out, val);
	67	q += 3;
	68	continue;
	69	}
	70	}
	71
	72	if (c == '+')
	73	strbuf_addch(&out, ' ');
	74	else
	75	strbuf_addch(&out, c);
	76	q++;
	77	} while (1);
	78	*query = q;
79	return strbuf_detach(&out, NULL);
80	}
81
82	static struct string_list *get_parameters(void)
83	{
84	if (!query_params) {
85	const char *query = getenv("QUERY_STRING");
86
87	query_params = xcalloc(1, sizeof(*query_params));
88	while (query && *query) {
89	char *name = decode_parameter(&query, 1);
90	char *value = decode_parameter(&query, 0);
91	struct string_list_item *i;
92
93	i = string_list_lookup(name, query_params);
94	if (!i)
95	i = string_list_insert(name, query_params);
96	else
97	free(i->util);
98	i->util = value;
99	}
100	}
101	return query_params;
102	}
103
104	static const char get_parameter(const char name)
105	{
106	struct string_list_item *i;
107	i = string_list_lookup(name, get_parameters());
108	return i ? i->util : NULL;
109	}
110
35487017	111	__attribute__((format (printf, 2, 3)))
2f4038ab SP	112	static void format_write(int fd, const char *fmt, ...)
	113	{
	114	static char buffer[1024];
	115
	116	va_list args;
	117	unsigned n;
	118
	119	va_start(args, fmt);
	120	n = vsnprintf(buffer, sizeof(buffer), fmt, args);
	121	va_end(args);
	122	if (n >= sizeof(buffer))
	123	die("protocol error: impossibly long line");
	124
	125	safe_write(fd, buffer, n);
	126	}
	127
	128	static void http_status(unsigned code, const char *msg)
	129	{
	130	format_write(1, "Status: %u %s\r\n", code, msg);
	131	}
	132
	133	static void hdr_str(const char name, const char value)
	134	{
	135	format_write(1, "%s: %s\r\n", name, value);
	136	}
	137
4a5328d6	138	static void hdr_int(const char *name, uintmax_t value)
2f4038ab SP	139	{
	140	format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
	141	}
	142
	143	static void hdr_date(const char *name, unsigned long when)
	144	{
	145	const char *value = show_date(when, 0, DATE_RFC2822);
	146	hdr_str(name, value);
	147	}
	148
	149	static void hdr_nocache(void)
	150	{
	151	hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
	152	hdr_str("Pragma", "no-cache");
	153	hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
	154	}
	155
	156	static void hdr_cache_forever(void)
	157	{
	158	unsigned long now = time(NULL);
	159	hdr_date("Date", now);
	160	hdr_date("Expires", now + 31536000);
	161	hdr_str("Cache-Control", "public, max-age=31536000");
	162	}
	163
	164	static void end_headers(void)
	165	{
	166	safe_write(1, "\r\n", 2);
	167	}
	168
35487017	169	__attribute__((format (printf, 1, 2)))
2f4038ab SP	170	static NORETURN void not_found(const char *err, ...)
	171	{
	172	va_list params;
	173
	174	http_status(404, "Not Found");
	175	hdr_nocache();
	176	end_headers();
	177
	178	va_start(params, err);
	179	if (err && *err)
	180	vfprintf(stderr, err, params);
	181	va_end(params);
	182	exit(0);
	183	}
	184
35487017	185	__attribute__((format (printf, 1, 2)))
556cfa3b SP	186	static NORETURN void forbidden(const char *err, ...)
	187	{
	188	va_list params;
	189
	190	http_status(403, "Forbidden");
	191	hdr_nocache();
	192	end_headers();
	193
	194	va_start(params, err);
	195	if (err && *err)
	196	vfprintf(stderr, err, params);
	197	va_end(params);
	198	exit(0);
	199	}
	200
5abb013b SP	201	static void select_getanyfile(void)
	202	{
	203	if (!getanyfile)
	204	forbidden("Unsupported service: getanyfile");
	205	}
	206
2f4038ab SP	207	static void send_strbuf(const char type, struct strbuf buf)
	208	{
	209	hdr_int(content_length, buf->len);
	210	hdr_str(content_type, type);
	211	end_headers();
	212	safe_write(1, buf->buf, buf->len);
	213	}
	214
92815b33	215	static void send_local_file(const char the_type, const char name)
2f4038ab SP	216	{
	217	const char *p = git_path("%s", name);
	218	size_t buf_alloc = 8192;
	219	char *buf = xmalloc(buf_alloc);
	220	int fd;
	221	struct stat sb;
2f4038ab SP	222
	223	fd = open(p, O_RDONLY);
	224	if (fd < 0)
	225	not_found("Cannot open '%s': %s", p, strerror(errno));
	226	if (fstat(fd, &sb) < 0)
	227	die_errno("Cannot stat '%s'", p);
	228
4a5328d6	229	hdr_int(content_length, sb.st_size);
2f4038ab SP	230	hdr_str(content_type, the_type);
	231	hdr_date(last_modified, sb.st_mtime);
	232	end_headers();
	233
4a5328d6	234	for (;;) {
2f4038ab SP	235	ssize_t n = xread(fd, buf, buf_alloc);
	236	if (n < 0)
	237	die_errno("Cannot read '%s'", p);
	238	if (!n)
	239	break;
	240	safe_write(1, buf, n);
	241	}
	242	close(fd);
	243	free(buf);
	244	}
	245
	246	static void get_text_file(char *name)
	247	{
5abb013b	248	select_getanyfile();
2f4038ab	249	hdr_nocache();
92815b33	250	send_local_file("text/plain", name);
2f4038ab SP	251	}
	252
	253	static void get_loose_object(char *name)
	254	{
5abb013b	255	select_getanyfile();
2f4038ab	256	hdr_cache_forever();
92815b33	257	send_local_file("application/x-git-loose-object", name);
2f4038ab SP	258	}
	259
	260	static void get_pack_file(char *name)
	261	{
5abb013b	262	select_getanyfile();
2f4038ab	263	hdr_cache_forever();
92815b33	264	send_local_file("application/x-git-packed-objects", name);
2f4038ab SP	265	}
	266
	267	static void get_idx_file(char *name)
	268	{
5abb013b	269	select_getanyfile();
2f4038ab	270	hdr_cache_forever();
92815b33	271	send_local_file("application/x-git-packed-objects-toc", name);
2f4038ab SP	272	}
2f4038ab SP	273
556cfa3b SP	274	static int http_config(const char var, const char value, void *cb)
556cfa3b SP	275	{
5abb013b SP	276	if (!strcmp(var, "http.getanyfile")) {
5abb013b SP	277	getanyfile = git_config_bool(var, value);
556cfa3b SP	278	return 0;
	279	}
	280
5abb013b SP	281	if (!prefixcmp(var, "http.")) {
	282	int i;
	283
	284	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
	285	struct rpc_service *svc = &rpc_service[i];
	286	if (!strcmp(var + 5, svc->config_name)) {
	287	svc->enabled = git_config_bool(var, value);
	288	return 0;
	289	}
	290	}
	291	}
	292
556cfa3b SP	293	/* we are not interested in parsing any other configuration here */
	294	return 0;
	295	}
	296
	297	static struct rpc_service select_service(const char name)
	298	{
	299	struct rpc_service *svc = NULL;
	300	int i;
	301
	302	if (prefixcmp(name, "git-"))
	303	forbidden("Unsupported service: '%s'", name);
	304
	305	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
	306	struct rpc_service *s = &rpc_service[i];
	307	if (!strcmp(s->name, name + 4)) {
	308	svc = s;
	309	break;
	310	}
	311	}
	312
	313	if (!svc)
	314	forbidden("Unsupported service: '%s'", name);
	315
556cfa3b SP	316	if (svc->enabled < 0) {
	317	const char *user = getenv("REMOTE_USER");
	318	svc->enabled = (user && *user) ? 1 : 0;
	319	}
	320	if (!svc->enabled)
	321	forbidden("Service not enabled: '%s'", svc->name);
	322	return svc;
	323	}
	324
	325	static void inflate_request(const char *prog_name, int out)
	326	{
	327	z_stream stream;
	328	unsigned char in_buf[8192];
	329	unsigned char out_buf[8192];
	330	unsigned long cnt = 0;
	331	int ret;
	332
	333	memset(&stream, 0, sizeof(stream));
	334	ret = inflateInit2(&stream, (15 + 16));
	335	if (ret != Z_OK)
	336	die("cannot start zlib inflater, zlib err %d", ret);
	337
	338	while (1) {
	339	ssize_t n = xread(0, in_buf, sizeof(in_buf));
	340	if (n <= 0)
	341	die("request ended in the middle of the gzip stream");
	342
	343	stream.next_in = in_buf;
	344	stream.avail_in = n;
	345
	346	while (0 < stream.avail_in) {
	347	int ret;
	348
	349	stream.next_out = out_buf;
	350	stream.avail_out = sizeof(out_buf);
	351
	352	ret = inflate(&stream, Z_NO_FLUSH);
	353	if (ret != Z_OK && ret != Z_STREAM_END)
	354	die("zlib error inflating request, result %d", ret);
	355
	356	n = stream.total_out - cnt;
	357	if (write_in_full(out, out_buf, n) != n)
	358	die("%s aborted reading request", prog_name);
	359	cnt += n;
	360
	361	if (ret == Z_STREAM_END)
	362	goto done;
	363	}
	364	}
	365
	366	done:
	367	inflateEnd(&stream);
	368	close(out);
	369	}
	370
	371	static void run_service(const char **argv)
	372	{
	373	const char *encoding = getenv("HTTP_CONTENT_ENCODING");
	374	const char *user = getenv("REMOTE_USER");
	375	const char *host = getenv("REMOTE_ADDR");
	376	char *env[3];
	377	struct strbuf buf = STRBUF_INIT;
	378	int gzipped_request = 0;
	379	struct child_process cld;
380
381	if (encoding && !strcmp(encoding, "gzip"))
382	gzipped_request = 1;
383	else if (encoding && !strcmp(encoding, "x-gzip"))
384	gzipped_request = 1;
385
386	if (!user \|\| !*user)
387	user = "anonymous";
388	if (!host \|\| !*host)
389	host = "(none)";
390
391	memset(&env, 0, sizeof(env));
392	strbuf_addf(&buf, "GIT_COMMITTER_NAME=%s", user);
393	env[0] = strbuf_detach(&buf, NULL);
394
395	strbuf_addf(&buf, "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
396	env[1] = strbuf_detach(&buf, NULL);
397	env[2] = NULL;
398
399	memset(&cld, 0, sizeof(cld));
400	cld.argv = argv;
401	cld.env = (const char const )env;
402	if (gzipped_request)
403	cld.in = -1;
404	cld.git_cmd = 1;
405	if (start_command(&cld))
406	exit(1);
407
408	close(1);
409	if (gzipped_request)
410	inflate_request(argv[0], cld.in);
411	else
412	close(0);
413
414	if (finish_command(&cld))
415	exit(1);
416	free(env[0]);
417	free(env[1]);
418	strbuf_release(&buf);
419	}
420
2f4038ab SP	421	static int show_text_ref(const char name, const unsigned char sha1,
	422	int flag, void *cb_data)
	423	{
	424	struct strbuf *buf = cb_data;
	425	struct object *o = parse_object(sha1);
	426	if (!o)
	427	return 0;
	428
	429	strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name);
	430	if (o->type == OBJ_TAG) {
	431	o = deref_tag(o, name, 0);
	432	if (!o)
	433	return 0;
	434	strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1), name);
	435	}
	436	return 0;
	437	}
	438
	439	static void get_info_refs(char *arg)
	440	{
556cfa3b	441	const char *service_name = get_parameter("service");
2f4038ab SP	442	struct strbuf buf = STRBUF_INIT;
2f4038ab SP	443
2f4038ab	444	hdr_nocache();
556cfa3b SP	445
	446	if (service_name) {
	447	const char argv[] = {NULL / service name */,
	448	"--stateless-rpc", "--advertise-refs",
	449	".", NULL};
	450	struct rpc_service *svc = select_service(service_name);
	451
	452	strbuf_addf(&buf, "application/x-git-%s-advertisement",
	453	svc->name);
	454	hdr_str(content_type, buf.buf);
	455	end_headers();
	456
	457	packet_write(1, "# service=git-%s\n", svc->name);
	458	packet_flush(1);
	459
	460	argv[0] = svc->name;
	461	run_service(argv);
	462
	463	} else {
5abb013b	464	select_getanyfile();
556cfa3b SP	465	for_each_ref(show_text_ref, &buf);
	466	send_strbuf("text/plain", &buf);
	467	}
2f4038ab SP	468	strbuf_release(&buf);
	469	}
	470
	471	static void get_info_packs(char *arg)
	472	{
	473	size_t objdirlen = strlen(get_object_directory());
	474	struct strbuf buf = STRBUF_INIT;
	475	struct packed_git *p;
	476	size_t cnt = 0;
	477
5abb013b	478	select_getanyfile();
2f4038ab SP	479	prepare_packed_git();
	480	for (p = packed_git; p; p = p->next) {
	481	if (p->pack_local)
	482	cnt++;
	483	}
	484
	485	strbuf_grow(&buf, cnt * 53 + 2);
	486	for (p = packed_git; p; p = p->next) {
	487	if (p->pack_local)
	488	strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
	489	}
	490	strbuf_addch(&buf, '\n');
	491
	492	hdr_nocache();
	493	send_strbuf("text/plain; charset=utf-8", &buf);
	494	strbuf_release(&buf);
	495	}
	496
556cfa3b SP	497	static void check_content_type(const char *accepted_type)
	498	{
	499	const char *actual_type = getenv("CONTENT_TYPE");
	500
	501	if (!actual_type)
	502	actual_type = "";
	503
	504	if (strcmp(actual_type, accepted_type)) {
	505	http_status(415, "Unsupported Media Type");
	506	hdr_nocache();
	507	end_headers();
	508	format_write(1,
	509	"Expected POST with Content-Type '%s',"
	510	" but received '%s' instead.\n",
	511	accepted_type, actual_type);
	512	exit(0);
	513	}
	514	}
	515
	516	static void service_rpc(char *service_name)
	517	{
	518	const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
	519	struct rpc_service *svc = select_service(service_name);
	520	struct strbuf buf = STRBUF_INIT;
	521
	522	strbuf_reset(&buf);
	523	strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
	524	check_content_type(buf.buf);
	525
	526	hdr_nocache();
	527
	528	strbuf_reset(&buf);
	529	strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
	530	hdr_str(content_type, buf.buf);
	531
	532	end_headers();
	533
	534	argv[0] = svc->name;
	535	run_service(argv);
	536	strbuf_release(&buf);
	537	}
	538
2f4038ab SP	539	static NORETURN void die_webcgi(const char *err, va_list params)
	540	{
	541	char buffer[1000];
	542
	543	http_status(500, "Internal Server Error");
	544	hdr_nocache();
	545	end_headers();
	546
	547	vsnprintf(buffer, sizeof(buffer), err, params);
	548	fprintf(stderr, "fatal: %s\n", buffer);
	549	exit(0);
	550	}
	551
917adc03 ML	552	static char* getdir(void)
	553	{
	554	struct strbuf buf = STRBUF_INIT;
	555	char *pathinfo = getenv("PATH_INFO");
	556	char *root = getenv("GIT_PROJECT_ROOT");
	557	char *path = getenv("PATH_TRANSLATED");
	558
	559	if (root && *root) {
	560	if (!pathinfo \|\| !*pathinfo)
	561	die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b SP	562	if (daemon_avoid_alias(pathinfo))
34b6cb8b SP	563	die("'%s': aliased", pathinfo);
917adc03	564	strbuf_addstr(&buf, root);
34b6cb8b SP	565	if (buf.buf[buf.len - 1] != '/')
	566	strbuf_addch(&buf, '/');
	567	if (pathinfo[0] == '/')
	568	pathinfo++;
917adc03 ML	569	strbuf_addstr(&buf, pathinfo);
	570	return strbuf_detach(&buf, NULL);
	571	} else if (path && *path) {
	572	return xstrdup(path);
	573	} else
	574	die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
	575	return NULL;
	576	}
	577
2f4038ab SP	578	static struct service_cmd {
	579	const char *method;
	580	const char *pattern;
	581	void (imp)(char );
	582	} services[] = {
	583	{"GET", "/HEAD$", get_text_file},
	584	{"GET", "/info/refs$", get_info_refs},
	585	{"GET", "/objects/info/alternates$", get_text_file},
	586	{"GET", "/objects/info/http-alternates$", get_text_file},
	587	{"GET", "/objects/info/packs$", get_info_packs},
	588	{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
	589	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
556cfa3b SP	590	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
	591
	592	{"POST", "/git-upload-pack$", service_rpc},
	593	{"POST", "/git-receive-pack$", service_rpc}
2f4038ab SP	594	};
	595
	596	int main(int argc, char **argv)
	597	{
	598	char *method = getenv("REQUEST_METHOD");
917adc03	599	char *dir;
2f4038ab SP	600	struct service_cmd *cmd = NULL;
	601	char *cmd_arg = NULL;
	602	int i;
	603
	604	git_extract_argv0_path(argv[0]);
	605	set_die_routine(die_webcgi);
	606
	607	if (!method)
	608	die("No REQUEST_METHOD from server");
	609	if (!strcmp(method, "HEAD"))
	610	method = "GET";
917adc03	611	dir = getdir();
2f4038ab SP	612
	613	for (i = 0; i < ARRAY_SIZE(services); i++) {
	614	struct service_cmd *c = &services[i];
	615	regex_t re;
	616	regmatch_t out[1];
	617
	618	if (regcomp(&re, c->pattern, REG_EXTENDED))
	619	die("Bogus regex in service table: %s", c->pattern);
	620	if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1	621	size_t n;
2f4038ab SP	622
	623	if (strcmp(method, c->method)) {
	624	const char *proto = getenv("SERVER_PROTOCOL");
	625	if (proto && !strcmp(proto, "HTTP/1.1"))
	626	http_status(405, "Method Not Allowed");
	627	else
	628	http_status(400, "Bad Request");
	629	hdr_nocache();
	630	end_headers();
	631	return 0;
	632	}
	633
	634	cmd = c;
48aec1b1	635	n = out[0].rm_eo - out[0].rm_so;
2f4038ab	636	cmd_arg = xmalloc(n);
48aec1b1 TC	637	memcpy(cmd_arg, dir + out[0].rm_so + 1, n-1);
48aec1b1 TC	638	cmd_arg[n-1] = '\0';
2f4038ab SP	639	dir[out[0].rm_so] = 0;
	640	break;
	641	}
	642	regfree(&re);
	643	}
	644
	645	if (!cmd)
	646	not_found("Request not supported: '%s'", dir);
	647
	648	setup_path();
	649	if (!enter_repo(dir, 0))
	650	not_found("Not a git repository: '%s'", dir);
	651
5abb013b	652	git_config(http_config, NULL);
2f4038ab SP	653	cmd->imp(cmd_arg);
	654	return 0;
	655	}