server.c@ 23

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Last change on this file since 23 was 23, checked in by Nishi, on Sep 14, 2024 at 10:31:16 PM
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[8]	1	/* $Id: server.c 23 2024-09-14 13:31:16Z nishi $ */
	2
[16]	3	#define SOURCE
	4
[8]	5	#include "tw_server.h"
	6
[12]	7	#include "tw_ssl.h"
[8]	8	#include "tw_config.h"
[16]	9	#include "tw_http.h"
[18]	10	#include "tw_module.h"
	11	#include "tw_version.h"
[8]	12
	13	#include <unistd.h>
	14	#include <string.h>
[11]	15	#include <stdbool.h>
[20]	16	#include <stdarg.h>
[21]	17	#include <sys/stat.h>
[8]	18
[18]	19	#include <cm_string.h>
[8]	20	#include <cm_log.h>
[21]	21	#include <cm_dir.h>
[8]	22
	23	#ifdef __MINGW32__
	24	#include <winsock2.h>
[11]	25	#include <process.h>
[8]	26	#else
	27	#include <sys/select.h>
	28	#include <sys/socket.h>
	29	#include <arpa/inet.h>
	30	#include <netinet/in.h>
	31	#include <netinet/tcp.h>
	32	#endif
	33
	34	extern struct tw_config config;
[18]	35	extern char tw_server[];
[8]	36
	37	fd_set fdset;
	38	int sockcount = 0;
	39
[9]	40	SOCKADDR addresses[MAX_PORTS];
	41	int sockets[MAX_PORTS];
[8]	42
[23]	43	/* https://qiita.com/gyu-don/items/5a640c6d2252a860c8cd */
	44	int tw_wildcard_match(const char* wildcard, const char* target) {
	45	const char pw = wildcard, pt = target;
	46
	47	while(1) {
	48	if(*pt == 0) {
	49	while(pw == '') pw++;
	50	return *pw == 0;
	51	} else if(*pw == 0) {
	52	return 0;
	53	} else if(pw == '') {
	54	return *(pw + 1) == 0 \|\| tw_wildcard_match(pw, pt + 1) \|\| tw_wildcard_match(pw + 1, pt);
	55	} else if(pw == '?' \|\| (pw == *pt)) {
	56	pw++;
	57	pt++;
	58	continue;
	59	} else {
	60	return 0;
	61	}
	62	}
	63	}
	64
[8]	65	void close_socket(int sock) {
	66	#ifdef __MINGW32__
	67	closesocket(sock);
	68	#else
	69	close(sock);
	70	#endif
	71	}
	72
	73	int tw_server_init(void) {
	74	int i;
	75	#ifdef __MINGW32__
	76	WSADATA wsa;
	77	WSAStartup(MAKEWORD(2, 0), &wsa);
	78	#endif
	79	for(i = 0; config.ports[i] != -1; i++)
	80	;
	81	sockcount = i;
	82	for(i = 0; config.ports[i] != -1; i++) {
	83	#ifdef NO_IPV6
	84	int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	85	#else
	86	int sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
	87	#endif
	88	#ifdef __MINGW32__
	89	if(sock == INVALID_SOCKET)
	90	#else
	91	if(sock < 0)
	92	#endif
	93	{
	94	cm_log("Server", "Socket creation failure");
	95	return 1;
	96	}
	97	int yes = 1;
	98	if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0) {
	99	close_socket(sock);
	100	cm_log("Server", "setsockopt failure (reuseaddr)");
	101	return 1;
	102	}
	103	if(setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&yes, sizeof(yes)) < 0) {
	104	close_socket(sock);
	105	cm_log("Server", "setsockopt failure (nodelay)");
	106	return 1;
	107	}
	108	#ifndef NO_IPV6
	109	int no = 0;
	110	if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&no, sizeof(no)) < 0) {
	111	close_socket(sock);
	112	cm_log("Server", "setsockopt failure (IPv6)");
	113	return 1;
	114	}
	115	#endif
	116	memset(&addresses[i], 0, sizeof(addresses[i]));
	117	#ifdef NO_IPV6
	118	addresses[i].sin_family = AF_INET;
	119	addresses[i].sin_addr.s_addr = INADDR_ANY;
	120	addresses[i].sin_port = htons(config.ports[i]);
	121	#else
	122	addresses[i].sin6_family = AF_INET6;
	123	addresses[i].sin6_addr = in6addr_any;
	124	addresses[i].sin6_port = htons(config.ports[i]);
	125	#endif
	126	if(bind(sock, (struct sockaddr*)&addresses[i], sizeof(addresses[i])) < 0) {
	127	close_socket(sock);
	128	cm_log("Server", "Bind failure");
	129	return 1;
	130	}
	131	if(listen(sock, 128) < 0) {
	132	close_socket(sock);
	133	cm_log("Server", "Listen failure");
	134	return 1;
	135	}
	136	sockets[i] = sock;
	137	}
	138	return 0;
	139	}
[9]	140
[16]	141	size_t tw_read(SSL* ssl, int s, void* data, size_t len) {
	142	if(ssl == NULL) {
	143	return recv(s, data, len, 0);
	144	} else {
	145	return SSL_read(ssl, data, len);
	146	}
	147	}
	148
	149	size_t tw_write(SSL* ssl, int s, void* data, size_t len) {
	150	if(ssl == NULL) {
	151	return send(s, data, len, 0);
	152	} else {
	153	return SSL_write(ssl, data, len);
	154	}
	155	}
	156
[20]	157	#define ERROR_HTML \
[18]	158	"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" \
	159	"<html>\n" \
	160	" <head>\n" \
[20]	161	" <title>%s</title>\n" \
[18]	162	" </head>\n" \
	163	" <body>\n" \
[20]	164	" <h1>%s</h1>\n" \
[18]	165	" <hr>\n" \
	166	" ", \
	167	address, \
	168	"\n" \
	169	" </body>\n" \
	170	"</html>\n"
	171
[21]	172	void tw_process_page(SSL* ssl, int sock, const char* status, const char* type, FILE* f, const unsigned char* doc, size_t size) {
[18]	173	char construct[512];
	174	sprintf(construct, "%llu", (unsigned long long)size);
	175	tw_write(ssl, sock, "HTTP/1.1 ", 9);
	176	tw_write(ssl, sock, (char*)status, strlen(status));
	177	tw_write(ssl, sock, "\r\n", 2);
	178	tw_write(ssl, sock, "Content-Type: ", 7 + 5 + 2);
	179	tw_write(ssl, sock, (char*)type, strlen(type));
	180	tw_write(ssl, sock, "\r\n", 2);
	181	tw_write(ssl, sock, "Server: ", 6 + 2);
	182	tw_write(ssl, sock, tw_server, strlen(tw_server));
	183	tw_write(ssl, sock, "\r\n", 2);
	184	tw_write(ssl, sock, "Content-Length: ", 7 + 7 + 2);
	185	tw_write(ssl, sock, construct, strlen(construct));
	186	tw_write(ssl, sock, "\r\n", 2);
	187	tw_write(ssl, sock, "\r\n", 2);
	188	size_t incr = 0;
	189	while(1) {
[22]	190	if(f != NULL) {
[21]	191	char buffer[128];
	192	fread(buffer, size < 128 ? size : 128, 1, f);
	193	tw_write(ssl, sock, buffer, size < 128 ? size : 128);
[22]	194	} else {
[21]	195	tw_write(ssl, sock, (unsigned char*)doc + incr, size < 128 ? size : 128);
	196	}
[18]	197	incr += 128;
[19]	198	if(size <= 128) break;
[18]	199	size -= 128;
	200	}
	201	}
	202
	203	const char* tw_http_status(int code) {
[20]	204	if(code == 200) {
	205	return "200 OK";
	206	} else if(code == 400) {
[18]	207	return "400 Bad Request";
[20]	208	} else if(code == 401) {
	209	return "401 Unauthorized";
	210	} else if(code == 403) {
	211	return "403 Forbidden";
	212	} else if(code == 404) {
	213	return "404 Not Found";
[18]	214	} else {
	215	return "400 Bad Request";
	216	}
	217	}
	218
	219	char* tw_http_default_error(int code, char* name, int port) {
	220	char address[1024];
	221	sprintf(address, "<address>%s Server at %s Port %d</address>", tw_server, name, port);
[20]	222
	223	char* st = cm_strdup(tw_http_status(code));
	224	char* st2;
	225	int i;
	226	for(i = 0; st[i] != 0; i++) {
	227	if(st[i] == ' ') {
	228	st2 = cm_strdup(st + i + 1);
	229	break;
	230	}
[18]	231	}
[20]	232	char* buffer = malloc(4096);
	233	char* str = cm_strcat3(ERROR_HTML);
	234	sprintf(buffer, str, st, st2);
	235	free(str);
	236	free(st);
	237	return buffer;
[18]	238	}
	239
	240	void tw_http_error(SSL* ssl, int sock, int error, char* name, int port) {
	241	char* str = tw_http_default_error(error, name, port);
[21]	242	tw_process_page(ssl, sock, tw_http_status(error), "text/html", NULL, str, strlen(str));
[18]	243	free(str);
	244	}
	245
[20]	246	void addstring(char** str, const char* add, ...) {
	247	int i;
	248	char cbuf[2];
	249	cbuf[1] = 0;
	250	va_list va;
	251	va_start(va, add);
	252	for(i = 0; add[i] != 0; i++) {
	253	cbuf[0] = add[i];
	254	if(add[i] == '%') {
	255	i++;
	256	if(add[i] == 's') {
	257	char* tmp = *str;
	258	str = cm_strcat(tmp, va_arg(va, const char));
	259	free(tmp);
	260	} else if(add[i] == 'h') {
	261	char* h = cm_html_escape(va_arg(va, const char*));
	262	char* tmp = *str;
	263	*str = cm_strcat(tmp, h);
	264	free(tmp);
	265	free(h);
[21]	266	} else if(add[i] == 'l') {
	267	char* h = cm_url_escape(va_arg(va, const char*));
	268	char* tmp = *str;
	269	*str = cm_strcat(tmp, h);
	270	free(tmp);
	271	free(h);
[20]	272	} else if(add[i] == 'd') {
	273	int n = va_arg(va, int);
	274	char* h = malloc(512);
	275	sprintf(h, "%d", n);
	276	char* tmp = *str;
	277	*str = cm_strcat(tmp, h);
	278	free(tmp);
	279	free(h);
	280	} else if(add[i] == '%') {
	281	char* tmp = *str;
	282	*str = cm_strcat(tmp, "%");
	283	free(tmp);
	284	}
	285	} else {
	286	char* tmp = *str;
	287	*str = cm_strcat(tmp, cbuf);
	288	free(tmp);
	289	}
	290	}
	291	}
	292
[22]	293	char* tw_get_mime(const char* ext, struct tw_config_entry* vhost_entry) {
	294	char* mime = "application/octet-stream";
	295	if(ext == NULL) return mime;
	296	bool set = false;
	297	int i;
	298	for(i = 0; i < vhost_entry->mime_count; i++) {
[23]	299	if(strcmp(vhost_entry->mimes[i].ext, "all") == 0 \|\| (ext != NULL && tw_wildcard_match(vhost_entry->mimes[i].ext, ext))) {
[22]	300	mime = vhost_entry->mimes[i].mime;
	301	set = true;
	302	}
	303	}
	304	if(!set) {
	305	for(i = 0; i < config.root.mime_count; i++) {
[23]	306	if(strcmp(config.root.mimes[i].ext, "all") == 0 \|\| (ext != NULL && tw_wildcard_match(config.root.mimes[i].ext, ext))) {
[22]	307	mime = config.root.mimes[i].mime;
	308	}
	309	}
	310	}
	311	return mime;
	312	}
	313
	314	char* tw_get_icon(const char* mime, struct tw_config_entry* vhost_entry) {
	315	char* icon = "";
	316	if(mime == NULL) return "";
	317	bool set = false;
	318	int i;
	319	for(i = 0; i < vhost_entry->icon_count; i++) {
[23]	320	if(strcmp(vhost_entry->icons[i].mime, "all") == 0 \|\| (mime != NULL && tw_wildcard_match(vhost_entry->icons[i].mime, mime))) {
[22]	321	icon = vhost_entry->icons[i].icon;
	322	set = true;
	323	}
	324	}
	325	if(!set) {
	326	for(i = 0; i < config.root.icon_count; i++) {
[23]	327	if(strcmp(config.root.icons[i].mime, "all") == 0 \|\| (mime != NULL && tw_wildcard_match(config.root.icons[i].mime, mime))) {
[22]	328	icon = config.root.icons[i].icon;
	329	}
	330	}
	331	}
	332	return icon;
	333	}
	334
[11]	335	#ifdef __MINGW32__
	336	struct pass_entry {
	337	int sock;
[12]	338	int port;
[11]	339	bool ssl;
[21]	340	SOCKADDR addr;
[11]	341	};
	342
	343	unsigned int WINAPI tw_server_pass(void* ptr) {
	344	int sock = ((struct pass_entry*)ptr)->sock;
	345	bool ssl = ((struct pass_entry*)ptr)->ssl;
[14]	346	int port = ((struct pass_entry*)ptr)->port;
[21]	347	SOCKADDR addr = ((struct pass_entry*)ptr)->addr;
[12]	348	free(ptr);
[11]	349	#else
[21]	350	void tw_server_pass(int sock, bool ssl, int port, SOCKADDR addr) {
[11]	351	#endif
[13]	352	char* name = config.hostname;
	353
[12]	354	SSL_CTX* ctx = NULL;
	355	SSL* s = NULL;
[15]	356	bool sslworks = false;
[12]	357	if(ssl) {
	358	ctx = tw_create_ssl_ctx(port);
	359	s = SSL_new(ctx);
	360	SSL_set_fd(s, sock);
	361	if(SSL_accept(s) <= 0) goto cleanup;
[15]	362	sslworks = true;
[12]	363	}
[16]	364	struct tw_http_request req;
[20]	365	struct tw_http_response res;
	366	struct tw_tool tools;
	367	res._processed = false;
	368	tw_init_tools(&tools);
[16]	369	int ret = tw_http_parse(s, sock, &req);
[17]	370	if(ret == 0) {
[21]	371	char* vhost = cm_strdup(config.hostname);
[20]	372	int i;
[22]	373	for(i = 0; req.headers[i] != NULL; i += 2) {
	374	if(cm_strcaseequ(req.headers[i], "Host")) {
[21]	375	free(vhost);
	376	vhost = req.headers[i + 1];
	377	break;
	378	}
	379	}
	380	cm_log("Server", "Host is %s", vhost);
	381	int port = s == NULL ? 80 : 443;
	382	char* host = cm_strdup(vhost);
[22]	383	for(i = 0; vhost[i] != 0; i++) {
	384	if(vhost[i] == ':') {
[21]	385	host[i] = 0;
	386	port = atoi(host + i + 1);
	387	break;
	388	}
	389	}
	390	cm_log("Server", "Hostname is `%s', port is `%d'", host, port);
	391	struct tw_config_entry* vhost_entry = tw_vhost_match(host, port);
[20]	392	for(i = 0; i < config.module_count; i++) {
	393	tw_mod_request_t mod_req = (tw_mod_request_t)tw_module_symbol(config.modules[i], "mod_request");
	394	if(mod_req != NULL) {
	395	int ret = mod_req(&tools, &req, &res);
	396	int co = ret & 0xff;
	397	if(co == _TW_MODULE_PASS) continue;
	398	if(co == _TW_MODULE_STOP) {
	399	res._processed = true;
	400	break;
	401	}
	402	if(co == _TW_MODULE_ERROR) {
	403	tw_http_error(s, sock, (ret & 0xffff00) >> 8, name, port);
	404	break;
	405	}
	406	}
	407	}
	408	if(!res._processed) {
[21]	409	cm_log("Server", "Document root is %s", vhost_entry->root == NULL ? "not set" : vhost_entry->root);
	410	char* path = cm_strcat(vhost_entry->root == NULL ? "" : vhost_entry->root, req.path);
	411	cm_log("Server", "Filesystem path is %s", path);
	412	struct stat st;
[22]	413	if(stat(path, &st) == 0) {
	414	if(!tw_permission_allowed(path, addr, req, vhost_entry)) {
[21]	415	tw_http_error(s, sock, 403, name, port);
[22]	416	} else if(S_ISDIR(st.st_mode)) {
[21]	417	char* str = malloc(1);
	418	str[0] = 0;
	419	char** items = cm_scandir(path);
	420	addstring(&str, "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n");
	421	addstring(&str, "<html>\n");
	422	addstring(&str, " <head>\n");
	423	addstring(&str, " <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n");
	424	addstring(&str, " <title>Index of %h</title>\n", req.path);
	425	addstring(&str, " </head>\n");
	426	addstring(&str, " <body>\n");
	427	addstring(&str, " <h1>Index of %h</h1>\n", req.path);
	428	addstring(&str, " <hr>\n");
	429	addstring(&str, " <table border=\"0\">\n");
	430	addstring(&str, " <tr>\n");
	431	addstring(&str, " <th></th>\n");
	432	addstring(&str, " <th>Filename</th>\n");
	433	addstring(&str, " </tr>\n");
[22]	434	if(items != NULL) {
	435	for(i = 0; items[i] != NULL; i++) {
	436	char* ext = NULL;
	437	int j;
	438	for(j = strlen(items[i]) - 1; j >= 0; j--) {
	439	if(items[i][j] == '.') {
	440	ext = cm_strdup(items[i] + j);
	441	break;
	442	}
	443	}
	444	char* mime = tw_get_mime(ext, vhost_entry);
	445	if(strcmp(items[i], "../") == 0) {
	446	mime = "misc/parent";
	447	} else if(items[i][strlen(items[i]) - 1] == '/') {
	448	mime = "misc/dir";
	449	}
	450	char* icon = tw_get_icon(mime, vhost_entry);
	451	if(ext != NULL) free(ext);
	452	char* itm = cm_strdup(items[i]);
	453	if(strlen(itm) >= 32) {
	454	if(itm[strlen(itm) - 1] == '/') {
	455	itm[31] = 0;
	456	itm[30] = '/';
	457	itm[29] = '.';
	458	itm[28] = '.';
	459	itm[27] = '.';
	460	} else {
	461	itm[31] = 0;
	462	itm[30] = '.';
	463	itm[29] = '.';
	464	itm[28] = '.';
	465	}
	466	}
[21]	467	addstring(&str, "<tr>\n");
[22]	468	addstring(&str, " <td><img src=\"%s\" alt=\"icon\"></td>\n", icon);
	469	addstring(&str, " <td><a href=\"%l\"><code>%h</code></a></td>\n", items[i], itm);
[21]	470	addstring(&str, "</tr>\n");
[22]	471	free(itm);
[21]	472	}
	473	}
	474	addstring(&str, " </table>\n");
	475	addstring(&str, " <hr>\n");
	476	addstring(&str, " <address>%s Server at %s Port %d</address>\n", tw_server, name, port);
	477	addstring(&str, " </body>\n");
	478	addstring(&str, "</html>\n");
	479	tw_process_page(s, sock, tw_http_status(200), "text/html", NULL, str, strlen(str));
	480	free(str);
[22]	481	} else {
[21]	482	char* ext = NULL;
[22]	483	for(i = strlen(req.path) - 1; i >= 0; i--) {
	484	if(req.path[i] == '.') {
[21]	485	ext = cm_strdup(req.path + i);
	486	break;
	487	}
	488	}
[22]	489	char* mime = tw_get_mime(ext, vhost_entry);
[21]	490	if(ext != NULL) free(ext);
	491	FILE* f = fopen(path, "rb");
	492	tw_process_page(s, sock, tw_http_status(200), mime, f, NULL, st.st_size);
	493	fclose(f);
	494	}
[22]	495	} else {
[21]	496	tw_http_error(s, sock, 404, name, port);
	497	}
	498	free(path);
[20]	499	}
[21]	500	free(vhost);
	501	free(host);
[22]	502	} else if(ret == -1) {
[18]	503	} else {
	504	tw_http_error(s, sock, 400, name, port);
[17]	505	}
[12]	506	cleanup:
[16]	507	if(sslworks) {
[15]	508	SSL_shutdown(s);
	509	}
	510	SSL_free(s);
[11]	511	close_socket(sock);
	512	#ifdef __MINGW32__
	513	_endthreadex(0);
	514	#endif
	515	}
	516
	517	void tw_server_loop(void) {
[9]	518	struct timeval tv;
[11]	519	while(1) {
[10]	520	FD_ZERO(&fdset);
	521	int i;
[11]	522	for(i = 0; i < sockcount; i++) {
[10]	523	FD_SET(sockets[i], &fdset);
	524	}
[9]	525	tv.tv_sec = 1;
	526	tv.tv_usec = 0;
[10]	527	int ret = select(FD_SETSIZE, &fdset, NULL, NULL, &tv);
[11]	528	if(ret == -1) {
[9]	529	break;
[11]	530	} else if(ret > 0) {
[9]	531	/* connection */
	532	int i;
[11]	533	for(i = 0; i < sockcount; i++) {
	534	if(FD_ISSET(sockets[i], &fdset)) {
[9]	535	SOCKADDR claddr;
	536	int clen = sizeof(claddr);
	537	int sock = accept(sockets[i], (struct sockaddr*)&claddr, &clen);
[12]	538	cm_log("Server", "New connection accepted");
[11]	539	#ifdef __MINGW32__
	540	HANDLE thread;
	541	struct pass_entry* e = malloc(sizeof(*e));
	542	e->sock = sock;
	543	e->ssl = config.ports[i] & (1ULL << 32);
[12]	544	e->port = config.ports[i];
[21]	545	e->addr = claddr;
[11]	546	thread = (HANDLE)_beginthreadex(NULL, 0, tw_server_pass, e, 0, NULL);
	547	#else
	548	pid_t pid = fork();
	549	if(pid == 0) {
[21]	550	tw_server_pass(sock, config.ports[i] & (1ULL << 32), config.ports[i], claddr);
[11]	551	_exit(0);
	552	} else {
	553	close_socket(sock);
	554	}
	555	#endif
[9]	556	}
	557	}
	558	}
	559	}
	560	}

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source: Main/trunk/Server/server.c@ 23

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