[git/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;
}

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);
}

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);
}

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 = out[0].rm_eo - out[0].rm_so;

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