server.c@ 21

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

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source: Main/trunk/Server/server.c@ 21

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