[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"
#include "url.h"
#include "argv-array.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 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 = url_decode_parameter_name(&query);
			char *value = url_decode_parameter_value(&query);
			struct string_list_item *i;

			i = string_list_lookup(query_params, name);
			if (!i)
				i = string_list_insert(query_params, name);
			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(get_parameters(), name);
	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)
{
	git_zstream stream;
	unsigned char in_buf[8192];
	unsigned char out_buf[8192];
	unsigned long cnt = 0;

	memset(&stream, 0, sizeof(stream));
	git_inflate_init_gzip_only(&stream);

	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 = git_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:
	git_inflate_end(&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");
	struct argv_array env = ARGV_ARRAY_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)";

	if (!getenv("GIT_COMMITTER_NAME"))
		argv_array_pushf(&env, "GIT_COMMITTER_NAME=%s", user);
	if (!getenv("GIT_COMMITTER_EMAIL"))
		argv_array_pushf(&env, "GIT_COMMITTER_EMAIL=%s@http.%s",
				 user, host);

	memset(&cld, 0, sizeof(cld));
	cld.argv = argv;
	cld.env = env.argv;
	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);
	argv_array_clear(&env);
}

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)
{
	static int dead;

	if (!dead) {
		dead = 1;
		http_status(500, "Internal Server Error");
		hdr_nocache();
		end_headers();

		vreportf("fatal: ", err, params);
	}
	exit(0); /* we successfully reported a failure ;-) */
}

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);
		end_url_with_slash(&buf, root);
		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_setup_gettext();

	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);
	if (!getenv("GIT_HTTP_EXPORT_ALL") &&
	    access("git-daemon-export-ok", F_OK) )
		not_found("Repository not exported: '%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"
638794cd	9	#include "url.h"
e32a4581	10	#include "argv-array.h"
2f4038ab SP	11
	12	static const char content_type[] = "Content-Type";
	13	static const char content_length[] = "Content-Length";
	14	static const char last_modified[] = "Last-Modified";
5abb013b	15	static int getanyfile = 1;
2f4038ab	16
556cfa3b SP	17	static struct string_list *query_params;
	18
	19	struct rpc_service {
	20	const char *name;
	21	const char *config_name;
	22	signed enabled : 2;
	23	};
	24
	25	static struct rpc_service rpc_service[] = {
	26	{ "upload-pack", "uploadpack", 1 },
	27	{ "receive-pack", "receivepack", -1 },
	28	};
	29
556cfa3b SP	30	static struct string_list *get_parameters(void)
	31	{
	32	if (!query_params) {
	33	const char *query = getenv("QUERY_STRING");
	34
	35	query_params = xcalloc(1, sizeof(*query_params));
	36	while (query && *query) {
638794cd JK	37	char *name = url_decode_parameter_name(&query);
638794cd JK	38	char *value = url_decode_parameter_value(&query);
556cfa3b SP	39	struct string_list_item *i;
556cfa3b SP	40
e8c8b713	41	i = string_list_lookup(query_params, name);
556cfa3b	42	if (!i)
78a395d3	43	i = string_list_insert(query_params, name);
556cfa3b SP	44	else
	45	free(i->util);
	46	i->util = value;
	47	}
	48	}
	49	return query_params;
	50	}
	51
	52	static const char get_parameter(const char name)
	53	{
	54	struct string_list_item *i;
e8c8b713	55	i = string_list_lookup(get_parameters(), name);
556cfa3b SP	56	return i ? i->util : NULL;
	57	}
	58
35487017	59	__attribute__((format (printf, 2, 3)))
2f4038ab SP	60	static void format_write(int fd, const char *fmt, ...)
	61	{
	62	static char buffer[1024];
	63
	64	va_list args;
	65	unsigned n;
	66
	67	va_start(args, fmt);
	68	n = vsnprintf(buffer, sizeof(buffer), fmt, args);
	69	va_end(args);
	70	if (n >= sizeof(buffer))
	71	die("protocol error: impossibly long line");
	72
	73	safe_write(fd, buffer, n);
	74	}
	75
	76	static void http_status(unsigned code, const char *msg)
	77	{
	78	format_write(1, "Status: %u %s\r\n", code, msg);
	79	}
	80
	81	static void hdr_str(const char name, const char value)
	82	{
	83	format_write(1, "%s: %s\r\n", name, value);
	84	}
	85
4a5328d6	86	static void hdr_int(const char *name, uintmax_t value)
2f4038ab SP	87	{
	88	format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
	89	}
	90
	91	static void hdr_date(const char *name, unsigned long when)
	92	{
	93	const char *value = show_date(when, 0, DATE_RFC2822);
	94	hdr_str(name, value);
	95	}
	96
	97	static void hdr_nocache(void)
	98	{
	99	hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
	100	hdr_str("Pragma", "no-cache");
	101	hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
	102	}
	103
	104	static void hdr_cache_forever(void)
	105	{
	106	unsigned long now = time(NULL);
	107	hdr_date("Date", now);
	108	hdr_date("Expires", now + 31536000);
	109	hdr_str("Cache-Control", "public, max-age=31536000");
	110	}
	111
	112	static void end_headers(void)
	113	{
	114	safe_write(1, "\r\n", 2);
	115	}
	116
35487017	117	__attribute__((format (printf, 1, 2)))
2f4038ab SP	118	static NORETURN void not_found(const char *err, ...)
	119	{
	120	va_list params;
	121
	122	http_status(404, "Not Found");
	123	hdr_nocache();
	124	end_headers();
	125
	126	va_start(params, err);
	127	if (err && *err)
	128	vfprintf(stderr, err, params);
	129	va_end(params);
	130	exit(0);
	131	}
	132
35487017	133	__attribute__((format (printf, 1, 2)))
556cfa3b SP	134	static NORETURN void forbidden(const char *err, ...)
	135	{
	136	va_list params;
	137
	138	http_status(403, "Forbidden");
	139	hdr_nocache();
	140	end_headers();
	141
	142	va_start(params, err);
	143	if (err && *err)
	144	vfprintf(stderr, err, params);
	145	va_end(params);
	146	exit(0);
	147	}
	148
5abb013b SP	149	static void select_getanyfile(void)
	150	{
	151	if (!getanyfile)
	152	forbidden("Unsupported service: getanyfile");
	153	}
	154
2f4038ab SP	155	static void send_strbuf(const char type, struct strbuf buf)
	156	{
	157	hdr_int(content_length, buf->len);
	158	hdr_str(content_type, type);
	159	end_headers();
	160	safe_write(1, buf->buf, buf->len);
	161	}
	162
92815b33	163	static void send_local_file(const char the_type, const char name)
2f4038ab SP	164	{
	165	const char *p = git_path("%s", name);
	166	size_t buf_alloc = 8192;
	167	char *buf = xmalloc(buf_alloc);
	168	int fd;
	169	struct stat sb;
2f4038ab SP	170
	171	fd = open(p, O_RDONLY);
	172	if (fd < 0)
	173	not_found("Cannot open '%s': %s", p, strerror(errno));
	174	if (fstat(fd, &sb) < 0)
	175	die_errno("Cannot stat '%s'", p);
	176
4a5328d6	177	hdr_int(content_length, sb.st_size);
2f4038ab SP	178	hdr_str(content_type, the_type);
	179	hdr_date(last_modified, sb.st_mtime);
	180	end_headers();
	181
4a5328d6	182	for (;;) {
2f4038ab SP	183	ssize_t n = xread(fd, buf, buf_alloc);
	184	if (n < 0)
	185	die_errno("Cannot read '%s'", p);
	186	if (!n)
	187	break;
	188	safe_write(1, buf, n);
	189	}
	190	close(fd);
	191	free(buf);
	192	}
	193
	194	static void get_text_file(char *name)
	195	{
5abb013b	196	select_getanyfile();
2f4038ab	197	hdr_nocache();
92815b33	198	send_local_file("text/plain", name);
2f4038ab SP	199	}
	200
	201	static void get_loose_object(char *name)
	202	{
5abb013b	203	select_getanyfile();
2f4038ab	204	hdr_cache_forever();
92815b33	205	send_local_file("application/x-git-loose-object", name);
2f4038ab SP	206	}
	207
	208	static void get_pack_file(char *name)
	209	{
5abb013b	210	select_getanyfile();
2f4038ab	211	hdr_cache_forever();
92815b33	212	send_local_file("application/x-git-packed-objects", name);
2f4038ab SP	213	}
	214
	215	static void get_idx_file(char *name)
	216	{
5abb013b	217	select_getanyfile();
2f4038ab	218	hdr_cache_forever();
92815b33	219	send_local_file("application/x-git-packed-objects-toc", name);
2f4038ab SP	220	}
2f4038ab SP	221
556cfa3b SP	222	static int http_config(const char var, const char value, void *cb)
556cfa3b SP	223	{
5abb013b SP	224	if (!strcmp(var, "http.getanyfile")) {
5abb013b SP	225	getanyfile = git_config_bool(var, value);
556cfa3b SP	226	return 0;
	227	}
	228
5abb013b SP	229	if (!prefixcmp(var, "http.")) {
	230	int i;
	231
	232	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
	233	struct rpc_service *svc = &rpc_service[i];
	234	if (!strcmp(var + 5, svc->config_name)) {
	235	svc->enabled = git_config_bool(var, value);
	236	return 0;
	237	}
	238	}
	239	}
	240
556cfa3b SP	241	/* we are not interested in parsing any other configuration here */
	242	return 0;
	243	}
	244
	245	static struct rpc_service select_service(const char name)
	246	{
	247	struct rpc_service *svc = NULL;
	248	int i;
	249
	250	if (prefixcmp(name, "git-"))
	251	forbidden("Unsupported service: '%s'", name);
	252
	253	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
	254	struct rpc_service *s = &rpc_service[i];
	255	if (!strcmp(s->name, name + 4)) {
	256	svc = s;
	257	break;
	258	}
	259	}
	260
	261	if (!svc)
	262	forbidden("Unsupported service: '%s'", name);
	263
556cfa3b SP	264	if (svc->enabled < 0) {
	265	const char *user = getenv("REMOTE_USER");
	266	svc->enabled = (user && *user) ? 1 : 0;
	267	}
	268	if (!svc->enabled)
	269	forbidden("Service not enabled: '%s'", svc->name);
	270	return svc;
	271	}
	272
	273	static void inflate_request(const char *prog_name, int out)
	274	{
ef49a7a0	275	git_zstream stream;
556cfa3b SP	276	unsigned char in_buf[8192];
	277	unsigned char out_buf[8192];
	278	unsigned long cnt = 0;
556cfa3b SP	279
556cfa3b SP	280	memset(&stream, 0, sizeof(stream));
5e86c1fb	281	git_inflate_init_gzip_only(&stream);
556cfa3b SP	282
	283	while (1) {
	284	ssize_t n = xread(0, in_buf, sizeof(in_buf));
	285	if (n <= 0)
	286	die("request ended in the middle of the gzip stream");
	287
	288	stream.next_in = in_buf;
	289	stream.avail_in = n;
	290
	291	while (0 < stream.avail_in) {
	292	int ret;
	293
	294	stream.next_out = out_buf;
	295	stream.avail_out = sizeof(out_buf);
	296
9e7e5ca3	297	ret = git_inflate(&stream, Z_NO_FLUSH);
556cfa3b SP	298	if (ret != Z_OK && ret != Z_STREAM_END)
	299	die("zlib error inflating request, result %d", ret);
	300
	301	n = stream.total_out - cnt;
	302	if (write_in_full(out, out_buf, n) != n)
	303	die("%s aborted reading request", prog_name);
	304	cnt += n;
	305
	306	if (ret == Z_STREAM_END)
	307	goto done;
	308	}
	309	}
	310
	311	done:
9e7e5ca3	312	git_inflate_end(&stream);
556cfa3b SP	313	close(out);
	314	}
	315
	316	static void run_service(const char **argv)
	317	{
	318	const char *encoding = getenv("HTTP_CONTENT_ENCODING");
	319	const char *user = getenv("REMOTE_USER");
	320	const char *host = getenv("REMOTE_ADDR");
e32a4581	321	struct argv_array env = ARGV_ARRAY_INIT;
556cfa3b SP	322	int gzipped_request = 0;
	323	struct child_process cld;
	324
	325	if (encoding && !strcmp(encoding, "gzip"))
	326	gzipped_request = 1;
	327	else if (encoding && !strcmp(encoding, "x-gzip"))
	328	gzipped_request = 1;
	329
	330	if (!user \|\| !*user)
	331	user = "anonymous";
	332	if (!host \|\| !*host)
	333	host = "(none)";
	334
e32a4581 JK	335	if (!getenv("GIT_COMMITTER_NAME"))
	336	argv_array_pushf(&env, "GIT_COMMITTER_NAME=%s", user);
	337	if (!getenv("GIT_COMMITTER_EMAIL"))
	338	argv_array_pushf(&env, "GIT_COMMITTER_EMAIL=%s@http.%s",
	339	user, host);
556cfa3b SP	340
	341	memset(&cld, 0, sizeof(cld));
	342	cld.argv = argv;
e32a4581	343	cld.env = env.argv;
556cfa3b SP	344	if (gzipped_request)
	345	cld.in = -1;
	346	cld.git_cmd = 1;
	347	if (start_command(&cld))
	348	exit(1);
	349
	350	close(1);
	351	if (gzipped_request)
	352	inflate_request(argv[0], cld.in);
	353	else
	354	close(0);
	355
	356	if (finish_command(&cld))
	357	exit(1);
e32a4581	358	argv_array_clear(&env);
556cfa3b SP	359	}
556cfa3b SP	360
2f4038ab SP	361	static int show_text_ref(const char name, const unsigned char sha1,
	362	int flag, void *cb_data)
	363	{
	364	struct strbuf *buf = cb_data;
	365	struct object *o = parse_object(sha1);
	366	if (!o)
	367	return 0;
	368
	369	strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name);
	370	if (o->type == OBJ_TAG) {
	371	o = deref_tag(o, name, 0);
	372	if (!o)
	373	return 0;
	374	strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1), name);
	375	}
	376	return 0;
	377	}
	378
	379	static void get_info_refs(char *arg)
	380	{
556cfa3b	381	const char *service_name = get_parameter("service");
2f4038ab SP	382	struct strbuf buf = STRBUF_INIT;
2f4038ab SP	383
2f4038ab	384	hdr_nocache();
556cfa3b SP	385
	386	if (service_name) {
	387	const char argv[] = {NULL / service name */,
	388	"--stateless-rpc", "--advertise-refs",
	389	".", NULL};
	390	struct rpc_service *svc = select_service(service_name);
	391
	392	strbuf_addf(&buf, "application/x-git-%s-advertisement",
	393	svc->name);
	394	hdr_str(content_type, buf.buf);
	395	end_headers();
	396
	397	packet_write(1, "# service=git-%s\n", svc->name);
	398	packet_flush(1);
	399
	400	argv[0] = svc->name;
	401	run_service(argv);
	402
	403	} else {
5abb013b	404	select_getanyfile();
556cfa3b SP	405	for_each_ref(show_text_ref, &buf);
	406	send_strbuf("text/plain", &buf);
	407	}
2f4038ab SP	408	strbuf_release(&buf);
	409	}
	410
	411	static void get_info_packs(char *arg)
	412	{
	413	size_t objdirlen = strlen(get_object_directory());
	414	struct strbuf buf = STRBUF_INIT;
	415	struct packed_git *p;
	416	size_t cnt = 0;
	417
5abb013b	418	select_getanyfile();
2f4038ab SP	419	prepare_packed_git();
	420	for (p = packed_git; p; p = p->next) {
	421	if (p->pack_local)
	422	cnt++;
	423	}
	424
	425	strbuf_grow(&buf, cnt * 53 + 2);
	426	for (p = packed_git; p; p = p->next) {
	427	if (p->pack_local)
	428	strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
	429	}
	430	strbuf_addch(&buf, '\n');
	431
	432	hdr_nocache();
	433	send_strbuf("text/plain; charset=utf-8", &buf);
	434	strbuf_release(&buf);
	435	}
	436
556cfa3b SP	437	static void check_content_type(const char *accepted_type)
	438	{
	439	const char *actual_type = getenv("CONTENT_TYPE");
	440
	441	if (!actual_type)
	442	actual_type = "";
	443
	444	if (strcmp(actual_type, accepted_type)) {
	445	http_status(415, "Unsupported Media Type");
	446	hdr_nocache();
	447	end_headers();
	448	format_write(1,
	449	"Expected POST with Content-Type '%s',"
	450	" but received '%s' instead.\n",
	451	accepted_type, actual_type);
	452	exit(0);
	453	}
	454	}
	455
	456	static void service_rpc(char *service_name)
	457	{
	458	const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
	459	struct rpc_service *svc = select_service(service_name);
	460	struct strbuf buf = STRBUF_INIT;
	461
	462	strbuf_reset(&buf);
	463	strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
	464	check_content_type(buf.buf);
	465
	466	hdr_nocache();
	467
	468	strbuf_reset(&buf);
	469	strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
	470	hdr_str(content_type, buf.buf);
	471
	472	end_headers();
	473
	474	argv[0] = svc->name;
	475	run_service(argv);
	476	strbuf_release(&buf);
	477	}
	478
2f4038ab SP	479	static NORETURN void die_webcgi(const char *err, va_list params)
2f4038ab SP	480	{
5856b5f5	481	static int dead;
2f4038ab	482
5856b5f5	483	if (!dead) {
5856b5f5	484	dead = 1;
5856b5f5 SP	485	http_status(500, "Internal Server Error");
	486	hdr_nocache();
	487	end_headers();
76265501 JH	488
76265501 JH	489	vreportf("fatal: ", err, params);
5856b5f5 SP	490	}
5856b5f5 SP	491	exit(0); /* we successfully reported a failure ;-) */
2f4038ab SP	492	}
2f4038ab SP	493
917adc03 ML	494	static char* getdir(void)
	495	{
	496	struct strbuf buf = STRBUF_INIT;
	497	char *pathinfo = getenv("PATH_INFO");
	498	char *root = getenv("GIT_PROJECT_ROOT");
	499	char *path = getenv("PATH_TRANSLATED");
	500
	501	if (root && *root) {
	502	if (!pathinfo \|\| !*pathinfo)
	503	die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b SP	504	if (daemon_avoid_alias(pathinfo))
34b6cb8b SP	505	die("'%s': aliased", pathinfo);
cf688cc2	506	end_url_with_slash(&buf, root);
34b6cb8b SP	507	if (pathinfo[0] == '/')
34b6cb8b SP	508	pathinfo++;
917adc03 ML	509	strbuf_addstr(&buf, pathinfo);
	510	return strbuf_detach(&buf, NULL);
	511	} else if (path && *path) {
	512	return xstrdup(path);
	513	} else
	514	die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
	515	return NULL;
	516	}
	517
2f4038ab SP	518	static struct service_cmd {
	519	const char *method;
	520	const char *pattern;
	521	void (imp)(char );
	522	} services[] = {
	523	{"GET", "/HEAD$", get_text_file},
	524	{"GET", "/info/refs$", get_info_refs},
	525	{"GET", "/objects/info/alternates$", get_text_file},
	526	{"GET", "/objects/info/http-alternates$", get_text_file},
	527	{"GET", "/objects/info/packs$", get_info_packs},
	528	{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
	529	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
556cfa3b SP	530	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
	531
	532	{"POST", "/git-upload-pack$", service_rpc},
	533	{"POST", "/git-receive-pack$", service_rpc}
2f4038ab SP	534	};
	535
	536	int main(int argc, char **argv)
	537	{
	538	char *method = getenv("REQUEST_METHOD");
917adc03	539	char *dir;
2f4038ab SP	540	struct service_cmd *cmd = NULL;
	541	char *cmd_arg = NULL;
	542	int i;
	543
5e9637c6 ÆAB	544	git_setup_gettext();
5e9637c6 ÆAB	545
2f4038ab SP	546	git_extract_argv0_path(argv[0]);
	547	set_die_routine(die_webcgi);
	548
	549	if (!method)
	550	die("No REQUEST_METHOD from server");
	551	if (!strcmp(method, "HEAD"))
	552	method = "GET";
917adc03	553	dir = getdir();
2f4038ab SP	554
	555	for (i = 0; i < ARRAY_SIZE(services); i++) {
	556	struct service_cmd *c = &services[i];
	557	regex_t re;
	558	regmatch_t out[1];
	559
	560	if (regcomp(&re, c->pattern, REG_EXTENDED))
	561	die("Bogus regex in service table: %s", c->pattern);
	562	if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1	563	size_t n;
2f4038ab SP	564
	565	if (strcmp(method, c->method)) {
	566	const char *proto = getenv("SERVER_PROTOCOL");
	567	if (proto && !strcmp(proto, "HTTP/1.1"))
	568	http_status(405, "Method Not Allowed");
	569	else
	570	http_status(400, "Bad Request");
	571	hdr_nocache();
	572	end_headers();
	573	return 0;
	574	}
	575
	576	cmd = c;
48aec1b1	577	n = out[0].rm_eo - out[0].rm_so;
2f4038ab	578	cmd_arg = xmalloc(n);
48aec1b1 TC	579	memcpy(cmd_arg, dir + out[0].rm_so + 1, n-1);
48aec1b1 TC	580	cmd_arg[n-1] = '\0';
2f4038ab SP	581	dir[out[0].rm_so] = 0;
	582	break;
	583	}
	584	regfree(&re);
	585	}
	586
	587	if (!cmd)
	588	not_found("Request not supported: '%s'", dir);
	589
	590	setup_path();
	591	if (!enter_repo(dir, 0))
	592	not_found("Not a git repository: '%s'", dir);
8b2bd7cd TC	593	if (!getenv("GIT_HTTP_EXPORT_ALL") &&
	594	access("git-daemon-export-ok", F_OK) )
	595	not_found("Repository not exported: '%s'", dir);
2f4038ab	596
5abb013b	597	git_config(http_config, NULL);
2f4038ab SP	598	cmd->imp(cmd_arg);
	599	return 0;
	600	}