[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");

	write_or_die(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)
{
	write_or_die(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();
	write_or_die(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;
		write_or_die(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 void http_config(void)
{
	int i, value = 0;
	struct strbuf var = STRBUF_INIT;

	git_config_get_bool("http.getanyfile", &getanyfile);

	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
		struct rpc_service *svc = &rpc_service[i];
		strbuf_addf(&var, "http.%s", svc->config_name);
		if (!git_config_get_bool(var.buf, &value))
			svc->enabled = value;
		strbuf_reset(&var);
	}

	strbuf_release(&var);
}

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

	if (!skip_prefix(name, "git-", &svc_name))
		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, svc_name)) {
			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");
	int gzipped_request = 0;
	struct child_process cld = CHILD_PROCESS_INIT;

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

	cld.argv = 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);
}

static int show_text_ref(const char *name, const unsigned char *sha1,
	int flag, void *cb_data)
{
	const char *name_nons = strip_namespace(name);
	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_nons);
	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_nons);
	}
	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 {
		struct each_ref_fn_sha1_adapter wrapped_show_text_ref =
			{show_text_ref, &buf};

		select_getanyfile();
		for_each_namespaced_ref(each_ref_fn_adapter, &wrapped_show_text_ref);
		send_strbuf("text/plain", &buf);
	}
	strbuf_release(&buf);
}

static int show_head_ref(const char *refname, const unsigned char *sha1,
	int flag, void *cb_data)
{
	struct strbuf *buf = cb_data;

	if (flag & REF_ISSYMREF) {
		unsigned char unused[20];
		const char *target = resolve_ref_unsafe(refname,
							RESOLVE_REF_READING,
							unused, NULL);
		const char *target_nons = strip_namespace(target);

		strbuf_addf(buf, "ref: %s\n", target_nons);
	} else {
		strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
	}

	return 0;
}

static void get_head(char *arg)
{
	struct strbuf buf = STRBUF_INIT;
	struct each_ref_fn_sha1_adapter wrapped_show_head_ref =
		{show_head_ref, &buf};

	select_getanyfile();
	head_ref_namespaced(each_ref_fn_adapter, &wrapped_show_head_ref);
	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$", get_head},
	{"GET", "/info/refs$", 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");
					hdr_str("Allow", !strcmp(c->method, "GET") ?
						"GET, HEAD" : c->method);
				} 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 = xmemdupz(dir + out[0].rm_so + 1, n - 1);
			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);

	http_config();
	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
cdf4fb8e	73	write_or_die(fd, buffer, n);
2f4038ab SP	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	{
cdf4fb8e	114	write_or_die(1, "\r\n", 2);
2f4038ab SP	115	}
2f4038ab SP	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();
cdf4fb8e	160	write_or_die(1, buf->buf, buf->len);
2f4038ab SP	161	}
2f4038ab SP	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;
cdf4fb8e	188	write_or_die(1, buf, n);
2f4038ab SP	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
6881f0cc	222	static void http_config(void)
556cfa3b	223	{
6881f0cc TA	224	int i, value = 0;
6881f0cc TA	225	struct strbuf var = STRBUF_INIT;
ae021d87	226
6881f0cc	227	git_config_get_bool("http.getanyfile", &getanyfile);
556cfa3b	228
6881f0cc TA	229	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
	230	struct rpc_service *svc = &rpc_service[i];
	231	strbuf_addf(&var, "http.%s", svc->config_name);
	232	if (!git_config_get_bool(var.buf, &value))
	233	svc->enabled = value;
	234	strbuf_reset(&var);
5abb013b SP	235	}
5abb013b SP	236
6881f0cc	237	strbuf_release(&var);
556cfa3b SP	238	}
	239
	240	static struct rpc_service select_service(const char name)
	241	{
ae021d87	242	const char *svc_name;
556cfa3b SP	243	struct rpc_service *svc = NULL;
	244	int i;
	245
ae021d87	246	if (!skip_prefix(name, "git-", &svc_name))
556cfa3b SP	247	forbidden("Unsupported service: '%s'", name);
	248
	249	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
	250	struct rpc_service *s = &rpc_service[i];
ae021d87	251	if (!strcmp(s->name, svc_name)) {
556cfa3b SP	252	svc = s;
	253	break;
	254	}
	255	}
	256
	257	if (!svc)
	258	forbidden("Unsupported service: '%s'", name);
	259
556cfa3b SP	260	if (svc->enabled < 0) {
	261	const char *user = getenv("REMOTE_USER");
	262	svc->enabled = (user && *user) ? 1 : 0;
	263	}
	264	if (!svc->enabled)
	265	forbidden("Service not enabled: '%s'", svc->name);
	266	return svc;
	267	}
	268
	269	static void inflate_request(const char *prog_name, int out)
	270	{
ef49a7a0	271	git_zstream stream;
556cfa3b SP	272	unsigned char in_buf[8192];
	273	unsigned char out_buf[8192];
	274	unsigned long cnt = 0;
556cfa3b SP	275
556cfa3b SP	276	memset(&stream, 0, sizeof(stream));
5e86c1fb	277	git_inflate_init_gzip_only(&stream);
556cfa3b SP	278
	279	while (1) {
	280	ssize_t n = xread(0, in_buf, sizeof(in_buf));
	281	if (n <= 0)
	282	die("request ended in the middle of the gzip stream");
	283
	284	stream.next_in = in_buf;
	285	stream.avail_in = n;
	286
	287	while (0 < stream.avail_in) {
	288	int ret;
	289
	290	stream.next_out = out_buf;
	291	stream.avail_out = sizeof(out_buf);
	292
9e7e5ca3	293	ret = git_inflate(&stream, Z_NO_FLUSH);
556cfa3b SP	294	if (ret != Z_OK && ret != Z_STREAM_END)
	295	die("zlib error inflating request, result %d", ret);
	296
	297	n = stream.total_out - cnt;
	298	if (write_in_full(out, out_buf, n) != n)
	299	die("%s aborted reading request", prog_name);
	300	cnt += n;
	301
	302	if (ret == Z_STREAM_END)
	303	goto done;
	304	}
	305	}
	306
	307	done:
9e7e5ca3	308	git_inflate_end(&stream);
556cfa3b SP	309	close(out);
	310	}
	311
	312	static void run_service(const char **argv)
	313	{
	314	const char *encoding = getenv("HTTP_CONTENT_ENCODING");
	315	const char *user = getenv("REMOTE_USER");
	316	const char *host = getenv("REMOTE_ADDR");
556cfa3b	317	int gzipped_request = 0;
d3180279	318	struct child_process cld = CHILD_PROCESS_INIT;
556cfa3b SP	319
	320	if (encoding && !strcmp(encoding, "gzip"))
	321	gzipped_request = 1;
	322	else if (encoding && !strcmp(encoding, "x-gzip"))
	323	gzipped_request = 1;
	324
	325	if (!user \|\| !*user)
	326	user = "anonymous";
	327	if (!host \|\| !*host)
	328	host = "(none)";
	329
e32a4581	330	if (!getenv("GIT_COMMITTER_NAME"))
a9154590	331	argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
e32a4581	332	if (!getenv("GIT_COMMITTER_EMAIL"))
a9154590 RS	333	argv_array_pushf(&cld.env_array,
a9154590 RS	334	"GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
556cfa3b	335
556cfa3b	336	cld.argv = argv;
556cfa3b SP	337	if (gzipped_request)
	338	cld.in = -1;
	339	cld.git_cmd = 1;
	340	if (start_command(&cld))
	341	exit(1);
	342
	343	close(1);
	344	if (gzipped_request)
	345	inflate_request(argv[0], cld.in);
	346	else
	347	close(0);
	348
	349	if (finish_command(&cld))
	350	exit(1);
556cfa3b SP	351	}
556cfa3b SP	352
2f4038ab SP	353	static int show_text_ref(const char name, const unsigned char sha1,
	354	int flag, void *cb_data)
	355	{
6130f86d	356	const char *name_nons = strip_namespace(name);
2f4038ab SP	357	struct strbuf *buf = cb_data;
	358	struct object *o = parse_object(sha1);
	359	if (!o)
	360	return 0;
	361
6130f86d	362	strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name_nons);
2f4038ab SP	363	if (o->type == OBJ_TAG) {
	364	o = deref_tag(o, name, 0);
	365	if (!o)
	366	return 0;
6130f86d JK	367	strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1),
6130f86d JK	368	name_nons);
2f4038ab SP	369	}
	370	return 0;
	371	}
	372
	373	static void get_info_refs(char *arg)
	374	{
556cfa3b	375	const char *service_name = get_parameter("service");
2f4038ab SP	376	struct strbuf buf = STRBUF_INIT;
2f4038ab SP	377
2f4038ab	378	hdr_nocache();
556cfa3b SP	379
	380	if (service_name) {
	381	const char argv[] = {NULL / service name */,
	382	"--stateless-rpc", "--advertise-refs",
	383	".", NULL};
	384	struct rpc_service *svc = select_service(service_name);
	385
	386	strbuf_addf(&buf, "application/x-git-%s-advertisement",
	387	svc->name);
	388	hdr_str(content_type, buf.buf);
	389	end_headers();
	390
	391	packet_write(1, "# service=git-%s\n", svc->name);
	392	packet_flush(1);
	393
	394	argv[0] = svc->name;
	395	run_service(argv);
	396
	397	} else {
2b2a5be3 MH	398	struct each_ref_fn_sha1_adapter wrapped_show_text_ref =
	399	{show_text_ref, &buf};
	400
5abb013b	401	select_getanyfile();
2b2a5be3	402	for_each_namespaced_ref(each_ref_fn_adapter, &wrapped_show_text_ref);
556cfa3b SP	403	send_strbuf("text/plain", &buf);
556cfa3b SP	404	}
2f4038ab SP	405	strbuf_release(&buf);
	406	}
	407
3e4ca43f	408	static int show_head_ref(const char refname, const unsigned char sha1,
6130f86d JK	409	int flag, void *cb_data)
	410	{
	411	struct strbuf *buf = cb_data;
	412
	413	if (flag & REF_ISSYMREF) {
1d811dbd	414	unsigned char unused[20];
7695d118 RS	415	const char *target = resolve_ref_unsafe(refname,
	416	RESOLVE_REF_READING,
	417	unused, NULL);
6130f86d JK	418	const char *target_nons = strip_namespace(target);
	419
	420	strbuf_addf(buf, "ref: %s\n", target_nons);
	421	} else {
	422	strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
	423	}
	424
	425	return 0;
	426	}
	427
	428	static void get_head(char *arg)
	429	{
	430	struct strbuf buf = STRBUF_INIT;
2b2a5be3 MH	431	struct each_ref_fn_sha1_adapter wrapped_show_head_ref =
2b2a5be3 MH	432	{show_head_ref, &buf};
6130f86d JK	433
6130f86d JK	434	select_getanyfile();
2b2a5be3	435	head_ref_namespaced(each_ref_fn_adapter, &wrapped_show_head_ref);
6130f86d JK	436	send_strbuf("text/plain", &buf);
	437	strbuf_release(&buf);
	438	}
	439
2f4038ab SP	440	static void get_info_packs(char *arg)
	441	{
	442	size_t objdirlen = strlen(get_object_directory());
	443	struct strbuf buf = STRBUF_INIT;
	444	struct packed_git *p;
	445	size_t cnt = 0;
	446
5abb013b	447	select_getanyfile();
2f4038ab SP	448	prepare_packed_git();
	449	for (p = packed_git; p; p = p->next) {
	450	if (p->pack_local)
	451	cnt++;
	452	}
	453
	454	strbuf_grow(&buf, cnt * 53 + 2);
	455	for (p = packed_git; p; p = p->next) {
	456	if (p->pack_local)
	457	strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
	458	}
	459	strbuf_addch(&buf, '\n');
	460
	461	hdr_nocache();
	462	send_strbuf("text/plain; charset=utf-8", &buf);
	463	strbuf_release(&buf);
	464	}
	465
556cfa3b SP	466	static void check_content_type(const char *accepted_type)
	467	{
	468	const char *actual_type = getenv("CONTENT_TYPE");
	469
	470	if (!actual_type)
	471	actual_type = "";
	472
	473	if (strcmp(actual_type, accepted_type)) {
	474	http_status(415, "Unsupported Media Type");
	475	hdr_nocache();
	476	end_headers();
	477	format_write(1,
	478	"Expected POST with Content-Type '%s',"
	479	" but received '%s' instead.\n",
	480	accepted_type, actual_type);
	481	exit(0);
	482	}
	483	}
	484
	485	static void service_rpc(char *service_name)
	486	{
	487	const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
	488	struct rpc_service *svc = select_service(service_name);
	489	struct strbuf buf = STRBUF_INIT;
	490
	491	strbuf_reset(&buf);
	492	strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
	493	check_content_type(buf.buf);
	494
	495	hdr_nocache();
	496
	497	strbuf_reset(&buf);
	498	strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
	499	hdr_str(content_type, buf.buf);
	500
	501	end_headers();
	502
	503	argv[0] = svc->name;
	504	run_service(argv);
	505	strbuf_release(&buf);
	506	}
	507
2f4038ab SP	508	static NORETURN void die_webcgi(const char *err, va_list params)
2f4038ab SP	509	{
5856b5f5	510	static int dead;
2f4038ab	511
5856b5f5	512	if (!dead) {
5856b5f5	513	dead = 1;
5856b5f5 SP	514	http_status(500, "Internal Server Error");
	515	hdr_nocache();
	516	end_headers();
76265501 JH	517
76265501 JH	518	vreportf("fatal: ", err, params);
5856b5f5 SP	519	}
5856b5f5 SP	520	exit(0); /* we successfully reported a failure ;-) */
2f4038ab SP	521	}
2f4038ab SP	522
917adc03 ML	523	static char* getdir(void)
	524	{
	525	struct strbuf buf = STRBUF_INIT;
	526	char *pathinfo = getenv("PATH_INFO");
	527	char *root = getenv("GIT_PROJECT_ROOT");
	528	char *path = getenv("PATH_TRANSLATED");
	529
	530	if (root && *root) {
	531	if (!pathinfo \|\| !*pathinfo)
	532	die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b SP	533	if (daemon_avoid_alias(pathinfo))
34b6cb8b SP	534	die("'%s': aliased", pathinfo);
cf688cc2	535	end_url_with_slash(&buf, root);
34b6cb8b SP	536	if (pathinfo[0] == '/')
34b6cb8b SP	537	pathinfo++;
917adc03 ML	538	strbuf_addstr(&buf, pathinfo);
	539	return strbuf_detach(&buf, NULL);
	540	} else if (path && *path) {
	541	return xstrdup(path);
	542	} else
	543	die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
	544	return NULL;
	545	}
	546
2f4038ab SP	547	static struct service_cmd {
	548	const char *method;
	549	const char *pattern;
	550	void (imp)(char );
	551	} services[] = {
6130f86d	552	{"GET", "/HEAD$", get_head},
2f4038ab SP	553	{"GET", "/info/refs$", get_info_refs},
	554	{"GET", "/objects/info/alternates$", get_text_file},
	555	{"GET", "/objects/info/http-alternates$", get_text_file},
	556	{"GET", "/objects/info/packs$", get_info_packs},
	557	{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
	558	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
556cfa3b SP	559	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
	560
	561	{"POST", "/git-upload-pack$", service_rpc},
	562	{"POST", "/git-receive-pack$", service_rpc}
2f4038ab SP	563	};
	564
	565	int main(int argc, char **argv)
	566	{
	567	char *method = getenv("REQUEST_METHOD");
917adc03	568	char *dir;
2f4038ab SP	569	struct service_cmd *cmd = NULL;
	570	char *cmd_arg = NULL;
	571	int i;
	572
5e9637c6 ÆAB	573	git_setup_gettext();
5e9637c6 ÆAB	574
2f4038ab SP	575	git_extract_argv0_path(argv[0]);
	576	set_die_routine(die_webcgi);
	577
	578	if (!method)
	579	die("No REQUEST_METHOD from server");
	580	if (!strcmp(method, "HEAD"))
	581	method = "GET";
917adc03	582	dir = getdir();
2f4038ab SP	583
	584	for (i = 0; i < ARRAY_SIZE(services); i++) {
	585	struct service_cmd *c = &services[i];
	586	regex_t re;
	587	regmatch_t out[1];
	588
	589	if (regcomp(&re, c->pattern, REG_EXTENDED))
	590	die("Bogus regex in service table: %s", c->pattern);
	591	if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1	592	size_t n;
2f4038ab SP	593
	594	if (strcmp(method, c->method)) {
	595	const char *proto = getenv("SERVER_PROTOCOL");
9247be05	596	if (proto && !strcmp(proto, "HTTP/1.1")) {
2f4038ab	597	http_status(405, "Method Not Allowed");
9247be05	598	hdr_str("Allow", !strcmp(c->method, "GET") ?
	599	"GET, HEAD" : c->method);
	600	} else
2f4038ab SP	601	http_status(400, "Bad Request");
	602	hdr_nocache();
	603	end_headers();
	604	return 0;
	605	}
	606
	607	cmd = c;
48aec1b1	608	n = out[0].rm_eo - out[0].rm_so;
5c0b13f8	609	cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
2f4038ab SP	610	dir[out[0].rm_so] = 0;
	611	break;
	612	}
	613	regfree(&re);
	614	}
	615
	616	if (!cmd)
	617	not_found("Request not supported: '%s'", dir);
	618
	619	setup_path();
	620	if (!enter_repo(dir, 0))
	621	not_found("Not a git repository: '%s'", dir);
8b2bd7cd TC	622	if (!getenv("GIT_HTTP_EXPORT_ALL") &&
	623	access("git-daemon-export-ok", F_OK) )
	624	not_found("Repository not exported: '%s'", dir);
2f4038ab	625
6881f0cc	626	http_config();
2f4038ab SP	627	cmd->imp(cmd_arg);
	628	return 0;
	629	}