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/* $Id: server.c 43 2024-09-18 09:19:03Z nishi $ */
#define SOURCE
#include "../config.h"
#include "tw_server.h"
#ifndef NO_SSL
#include "tw_ssl.h"
#endif
#include "tw_config.h"
#include "tw_http.h"
#include "tw_module.h"
#include "tw_version.h"
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <time.h>
#include <cm_string.h>
#include <cm_log.h>
#include <cm_dir.h>
#ifdef __MINGW32__
#include <winsock2.h>
#include <process.h>
#include "strptime.h"
#else
#include <sys/select.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif
extern struct tw_config config;
extern char tw_server[];
fd_set fdset;
int sockcount = 0;
SOCKADDR addresses[MAX_PORTS];
int sockets[MAX_PORTS];
/* https://qiita.com/gyu-don/items/5a640c6d2252a860c8cd */
int tw_wildcard_match(const char* wildcard, const char* target) {
const char *pw = wildcard, *pt = target;
while(1) {
if(*pt == 0) {
while(*pw == '*') pw++;
return *pw == 0;
} else if(*pw == 0) {
return 0;
} else if(*pw == '*') {
return *(pw + 1) == 0 || tw_wildcard_match(pw, pt + 1) || tw_wildcard_match(pw + 1, pt);
} else if(*pw == '?' || (*pw == *pt)) {
pw++;
pt++;
continue;
} else {
return 0;
}
}
}
void close_socket(int sock) {
#ifdef __MINGW32__
closesocket(sock);
#else
close(sock);
#endif
}
int tw_server_init(void) {
int i;
#ifdef __MINGW32__
WSADATA wsa;
WSAStartup(MAKEWORD(2, 0), &wsa);
#endif
for(i = 0; config.ports[i] != -1; i++)
;
sockcount = i;
for(i = 0; config.ports[i] != -1; i++) {
#ifdef NO_IPV6
int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
#else
int sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
#endif
#ifdef __MINGW32__
if(sock == INVALID_SOCKET)
#else
if(sock < 0)
#endif
{
cm_log("Server", "Socket creation failure");
return 1;
}
int yes = 1;
if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0) {
close_socket(sock);
cm_log("Server", "setsockopt failure (reuseaddr)");
return 1;
}
if(setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&yes, sizeof(yes)) < 0) {
close_socket(sock);
cm_log("Server", "setsockopt failure (nodelay)");
return 1;
}
#ifndef NO_IPV6
int no = 0;
if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&no, sizeof(no)) < 0) {
close_socket(sock);
cm_log("Server", "setsockopt failure (IPv6)");
return 1;
}
#endif
memset(&addresses[i], 0, sizeof(addresses[i]));
#ifdef NO_IPV6
addresses[i].sin_family = AF_INET;
addresses[i].sin_addr.s_addr = INADDR_ANY;
addresses[i].sin_port = htons(config.ports[i]);
#else
addresses[i].sin6_family = AF_INET6;
addresses[i].sin6_addr = in6addr_any;
addresses[i].sin6_port = htons(config.ports[i]);
#endif
if(bind(sock, (struct sockaddr*)&addresses[i], sizeof(addresses[i])) < 0) {
close_socket(sock);
cm_log("Server", "Bind failure");
return 1;
}
if(listen(sock, 128) < 0) {
close_socket(sock);
cm_log("Server", "Listen failure");
return 1;
}
sockets[i] = sock;
}
return 0;
}
size_t tw_read(SSL* ssl, int s, void* data, size_t len) {
#ifndef NO_SSL
if(ssl == NULL) {
return recv(s, data, len, 0);
} else {
return SSL_read(ssl, data, len);
}
#else
return recv(s, data, len, 0);
#endif
}
size_t tw_write(SSL* ssl, int s, void* data, size_t len) {
#ifndef NO_SSL
if(ssl == NULL) {
return send(s, data, len, 0);
} else {
return SSL_write(ssl, data, len);
}
#else
return send(s, data, len, 0);
#endif
}
#define ERROR_HTML \
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" \
"<html>\n" \
" <head>\n" \
" <title>%s</title>\n" \
" </head>\n" \
" <body>\n" \
" <h1>%s</h1>\n" \
" <hr>\n" \
" ", \
address, \
"\n" \
" </body>\n" \
"</html>\n"
void _tw_process_page(SSL* ssl, int sock, const char* status, const char* type, FILE* f, const unsigned char* doc, size_t size, char** headers, time_t mtime, time_t cmtime) {
char construct[512];
if(mtime != 0 && cmtime != 0 && mtime <= cmtime) {
status = "304 Not Modified";
type = NULL;
size = 0;
headers = NULL;
f = NULL;
doc = NULL;
}
sprintf(construct, "%llu", (unsigned long long)size);
tw_write(ssl, sock, "HTTP/1.1 ", 9);
tw_write(ssl, sock, (char*)status, strlen(status));
tw_write(ssl, sock, "\r\n", 2);
if(type != NULL) {
tw_write(ssl, sock, "Content-Type: ", 7 + 5 + 2);
tw_write(ssl, sock, (char*)type, strlen(type));
tw_write(ssl, sock, "\r\n", 2);
}
tw_write(ssl, sock, "Server: ", 6 + 2);
tw_write(ssl, sock, tw_server, strlen(tw_server));
tw_write(ssl, sock, "\r\n", 2);
if(size != 0) {
tw_write(ssl, sock, "Content-Length: ", 7 + 7 + 2);
tw_write(ssl, sock, construct, strlen(construct));
tw_write(ssl, sock, "\r\n", 2);
if(mtime != 0) {
struct tm* tm = gmtime(&mtime);
char date[513];
strftime(date, 512, "%a, %d %b %Y %H:%M:%S GMT", tm);
tw_write(ssl, sock, "Last-Modified: ", 5 + 8 + 2);
tw_write(ssl, sock, date, strlen(date));
tw_write(ssl, sock, "\r\n", 2);
}
}
int i;
if(headers != NULL) {
for(i = 0; headers[i] != NULL; i += 2) {
tw_write(ssl, sock, headers[i], strlen(headers[i]));
tw_write(ssl, sock, ": ", 2);
tw_write(ssl, sock, headers[i + 1], strlen(headers[i + 1]));
tw_write(ssl, sock, "\r\n", 2);
}
}
tw_write(ssl, sock, "\r\n", 2);
if(doc == NULL && f == NULL) return;
size_t incr = 0;
while(1) {
if(f != NULL) {
char buffer[128];
fread(buffer, size < 128 ? size : 128, 1, f);
tw_write(ssl, sock, buffer, size < 128 ? size : 128);
} else {
tw_write(ssl, sock, (unsigned char*)doc + incr, size < 128 ? size : 128);
}
incr += 128;
if(size <= 128) break;
size -= 128;
}
}
void tw_process_page(SSL* ssl, int sock, const char* status, const char* type, FILE* f, const unsigned char* doc, size_t size, time_t mtime, time_t cmtime) { _tw_process_page(ssl, sock, status, type, f, doc, size, NULL, mtime, cmtime); }
const char* tw_http_status(int code) {
if(code == 200) {
return "200 OK";
} else if(code == 308) {
return "308 Permanent Redirect";
} else if(code == 400) {
return "400 Bad Request";
} else if(code == 401) {
return "401 Unauthorized";
} else if(code == 403) {
return "403 Forbidden";
} else if(code == 404) {
return "404 Not Found";
} else {
return "400 Bad Request";
}
}
char* tw_http_default_error(int code, char* name, int port) {
char address[1024];
sprintf(address, "<address>%s Server at %s Port %d</address>", tw_server, name, port);
char* st = cm_strdup(tw_http_status(code));
char* st2;
int i;
for(i = 0; st[i] != 0; i++) {
if(st[i] == ' ') {
st2 = cm_strdup(st + i + 1);
break;
}
}
char* buffer = malloc(4096);
char* str = cm_strcat3(ERROR_HTML);
sprintf(buffer, str, st, st2);
free(str);
free(st);
return buffer;
}
void tw_http_error(SSL* ssl, int sock, int error, char* name, int port) {
char* str = tw_http_default_error(error, name, port);
tw_process_page(ssl, sock, tw_http_status(error), "text/html", NULL, str, strlen(str), 0, 0);
free(str);
}
void addstring(char** str, const char* add, ...) {
int i;
char cbuf[2];
cbuf[1] = 0;
va_list va;
va_start(va, add);
for(i = 0; add[i] != 0; i++) {
cbuf[0] = add[i];
if(add[i] == '%') {
i++;
if(add[i] == 's') {
char* tmp = *str;
*str = cm_strcat(tmp, va_arg(va, const char*));
free(tmp);
} else if(add[i] == 'h') {
char* h = cm_html_escape(va_arg(va, const char*));
char* tmp = *str;
*str = cm_strcat(tmp, h);
free(tmp);
free(h);
} else if(add[i] == 'l') {
char* h = cm_url_escape(va_arg(va, const char*));
char* tmp = *str;
*str = cm_strcat(tmp, h);
free(tmp);
free(h);
} else if(add[i] == 'd') {
int n = va_arg(va, int);
char* h = malloc(512);
sprintf(h, "%d", n);
char* tmp = *str;
*str = cm_strcat(tmp, h);
free(tmp);
free(h);
} else if(add[i] == '%') {
char* tmp = *str;
*str = cm_strcat(tmp, "%");
free(tmp);
}
} else {
char* tmp = *str;
*str = cm_strcat(tmp, cbuf);
free(tmp);
}
}
}
char* tw_get_mime(const char* ext, struct tw_config_entry* vhost_entry) {
char* mime = "application/octet-stream";
if(ext == NULL) return mime;
bool set = false;
int i;
for(i = 0; i < vhost_entry->mime_count; i++) {
if(strcmp(vhost_entry->mimes[i].ext, "all") == 0 || (ext != NULL && tw_wildcard_match(vhost_entry->mimes[i].ext, ext))) {
mime = vhost_entry->mimes[i].mime;
set = true;
}
}
if(!set) {
for(i = 0; i < config.root.mime_count; i++) {
if(strcmp(config.root.mimes[i].ext, "all") == 0 || (ext != NULL && tw_wildcard_match(config.root.mimes[i].ext, ext))) {
mime = config.root.mimes[i].mime;
}
}
}
return mime;
}
char* tw_get_icon(const char* mime, struct tw_config_entry* vhost_entry) {
char* icon = "";
if(mime == NULL) return "";
bool set = false;
int i;
for(i = 0; i < vhost_entry->icon_count; i++) {
if(strcmp(vhost_entry->icons[i].mime, "all") == 0 || (mime != NULL && tw_wildcard_match(vhost_entry->icons[i].mime, mime))) {
icon = vhost_entry->icons[i].icon;
set = true;
}
}
if(!set) {
for(i = 0; i < config.root.icon_count; i++) {
if(strcmp(config.root.icons[i].mime, "all") == 0 || (mime != NULL && tw_wildcard_match(config.root.icons[i].mime, mime))) {
icon = config.root.icons[i].icon;
}
}
}
return icon;
}
#ifdef __MINGW32__
struct pass_entry {
int sock;
int port;
bool ssl;
SOCKADDR addr;
};
unsigned int WINAPI tw_server_pass(void* ptr) {
int sock = ((struct pass_entry*)ptr)->sock;
bool ssl = ((struct pass_entry*)ptr)->ssl;
int port = ((struct pass_entry*)ptr)->port;
SOCKADDR addr = ((struct pass_entry*)ptr)->addr;
free(ptr);
#else
void tw_server_pass(int sock, bool ssl, int port, SOCKADDR addr) {
#endif
char* name = config.hostname;
#ifndef NO_SSL
SSL_CTX* ctx = NULL;
SSL* s = NULL;
bool sslworks = false;
if(ssl) {
ctx = tw_create_ssl_ctx(port);
s = SSL_new(ctx);
SSL_set_fd(s, sock);
if(SSL_accept(s) <= 0) goto cleanup;
sslworks = true;
}
#else
void* s = NULL;
#endif
struct tw_http_request req;
struct tw_http_response res;
struct tw_tool tools;
res._processed = false;
tw_init_tools(&tools);
int ret = tw_http_parse(s, sock, &req);
if(ret == 0) {
char* vhost = cm_strdup(config.hostname);
int i;
time_t cmtime = 0;
for(i = 0; req.headers[i] != NULL; i += 2) {
if(cm_strcaseequ(req.headers[i], "Host")) {
free(vhost);
vhost = cm_strdup(req.headers[i + 1]);
} else if(cm_strcaseequ(req.headers[i], "If-Modified-Since")) {
struct tm tm;
strptime(req.headers[i + 1], "%a, %d %b %Y %H:%M:%S GMT", &tm);
#ifdef __MINGW32__
cmtime = _mkgmtime(&tm);
#else
cmtime = timegm(&tm);
#endif
}
}
cm_log("Server", "Host is %s", vhost);
int port = s == NULL ? 80 : 443;
char* host = cm_strdup(vhost);
for(i = 0; vhost[i] != 0; i++) {
if(vhost[i] == ':') {
host[i] = 0;
port = atoi(host + i + 1);
break;
}
}
cm_log("Server", "Hostname is `%s', port is `%d'", host, port);
struct tw_config_entry* vhost_entry = tw_vhost_match(host, port);
for(i = 0; i < config.module_count; i++) {
tw_mod_request_t mod_req = (tw_mod_request_t)tw_module_symbol(config.modules[i], "mod_request");
if(mod_req != NULL) {
int ret = mod_req(&tools, &req, &res);
int co = ret & 0xff;
if(co == _TW_MODULE_PASS) continue;
if(co == _TW_MODULE_STOP) {
res._processed = true;
break;
}
if(co == _TW_MODULE_ERROR) {
tw_http_error(s, sock, (ret & 0xffff00) >> 8, name, port);
break;
}
}
}
if(!res._processed) {
cm_log("Server", "Document root is %s", vhost_entry->root == NULL ? "not set" : vhost_entry->root);
char* path = cm_strcat(vhost_entry->root == NULL ? "" : vhost_entry->root, req.path);
cm_log("Server", "Filesystem path is %s", path);
struct stat st;
if(stat(path, &st) == 0) {
if(!tw_permission_allowed(path, addr, req, vhost_entry)) {
tw_http_error(s, sock, 403, name, port);
} else if(S_ISDIR(st.st_mode)) {
if(req.path[strlen(req.path) - 1] != '/') {
char* headers[3] = {"Location", cm_strcat(req.path, "/"), NULL};
_tw_process_page(s, sock, tw_http_status(308), NULL, NULL, NULL, 0, headers, 0, 0);
free(headers[1]);
} else {
char** indexes = vhost_entry->index_count == 0 ? config.root.indexes : vhost_entry->indexes;
int index_count = vhost_entry->index_count == 0 ? config.root.index_count : vhost_entry->index_count;
bool found = false;
for(i = 0; i < index_count; i++) {
char* p = cm_strcat3(path, "/", indexes[i]);
FILE* f = fopen(p, "rb");
if(f != NULL) {
char* ext = NULL;
int j;
for(j = strlen(p) - 1; j >= 0; j--) {
if(p[j] == '.') {
ext = cm_strdup(p + j);
break;
} else if(p[j] == '/') {
break;
}
}
struct stat st;
stat(p, &st);
char* mime = tw_get_mime(ext, vhost_entry);
tw_process_page(s, sock, tw_http_status(200), mime, f, NULL, st.st_size, 0, 0);
fclose(f);
free(p);
found = true;
break;
}
free(p);
}
if(!found) {
char* str = malloc(1);
str[0] = 0;
char** items = cm_scandir(path);
addstring(&str, "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n");
addstring(&str, "<html>\n");
addstring(&str, " <head>\n");
addstring(&str, " <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n");
addstring(&str, " <title>Index of %h</title>\n", req.path);
addstring(&str, " </head>\n");
addstring(&str, " <body>\n");
addstring(&str, " <h1>Index of %h</h1>\n", req.path);
addstring(&str, " <hr>\n");
addstring(&str, " <table border=\"0\">\n");
addstring(&str, " <tr>\n");
addstring(&str, " <th></th>\n");
addstring(&str, " <th>Filename</th>\n");
addstring(&str, " <th>MIME</th>\n");
addstring(&str, " <th>Size</th>\n");
addstring(&str, " </tr>\n");
int readme = -1;
char** readmes = vhost_entry->readme_count == 0 ? config.root.readmes : vhost_entry->readmes;
int readme_count = vhost_entry->readme_count == 0 ? config.root.readme_count : vhost_entry->readme_count;
if(items != NULL) {
int phase = 0;
doit:
for(i = 0; items[i] != NULL; i++) {
int j;
char* fpth = cm_strcat3(path, "/", items[i]);
struct stat s;
char size[512];
size[0] = 0;
stat(fpth, &s);
if(phase == 0 && !S_ISDIR(s.st_mode)) {
free(fpth);
continue;
} else if(phase == 1 && S_ISDIR(s.st_mode)) {
free(fpth);
continue;
}
if(readme == -1) {
for(j = 0; j < readme_count; j++) {
if(strcmp(items[i], readmes[j]) == 0) {
readme = j;
break;
}
}
if(readme != -1) {
free(fpth);
continue;
}
}
if(s.st_size < 1024ULL) {
sprintf(size, "%d", (int)s.st_size);
} else if(s.st_size < 1024ULL * 1024) {
sprintf(size, "%.1fK", (double)s.st_size / 1024);
} else if(s.st_size < 1024ULL * 1024 * 1024) {
sprintf(size, "%.1fM", (double)s.st_size / 1024 / 1024);
} else if(s.st_size < 1024ULL * 1024 * 1024 * 1024) {
sprintf(size, "%.1fG", (double)s.st_size / 1024 / 1024 / 1024);
} else if(s.st_size < 1024ULL * 1024 * 1024 * 1024 * 1024) {
sprintf(size, "%.1fT", (double)s.st_size / 1024 / 1024 / 1024 / 1024);
}
free(fpth);
char* ext = NULL;
for(j = strlen(items[i]) - 1; j >= 0; j--) {
if(items[i][j] == '.') {
ext = cm_strdup(items[i] + j);
break;
} else if(items[i][j] == '/') {
break;
}
}
char* showmime = "";
char* mime = tw_get_mime(ext, vhost_entry);
if(strcmp(items[i], "../") == 0) {
mime = "misc/parent";
size[0] = 0;
} else if(items[i][strlen(items[i]) - 1] == '/') {
mime = "misc/dir";
size[0] = 0;
} else {
showmime = mime;
}
char* icon = tw_get_icon(mime, vhost_entry);
if(ext != NULL) free(ext);
char* itm = cm_strdup(items[i]);
if(strlen(itm) >= 32) {
if(itm[strlen(itm) - 1] == '/') {
itm[31] = 0;
itm[30] = '/';
itm[29] = '.';
itm[28] = '.';
itm[27] = '.';
} else {
itm[31] = 0;
itm[30] = '.';
itm[29] = '.';
itm[28] = '.';
}
}
addstring(&str, "<tr>\n");
addstring(&str, " <td><img src=\"%s\" alt=\"icon\"></td>\n", icon);
addstring(&str, " <td><a href=\"%l\"><code>%h</code></a></td>\n", items[i], itm);
addstring(&str, " <td><code>  %h  </code></td>\n", showmime);
addstring(&str, " <td><code>  %s  </code></td>\n", size);
addstring(&str, "</tr>\n");
free(itm);
}
phase++;
if(phase != 2) goto doit;
for(i = 0; items[i] != NULL; i++) free(items[i]);
free(items);
}
addstring(&str, " </table>\n");
if(readme != -1) {
addstring(&str, "<hr>\n");
char* fpth = cm_strcat3(path, "/", readmes[readme]);
struct stat s;
stat(fpth, &s);
FILE* fr = fopen(fpth, "r");
if(fr != NULL) {
char* rmbuf = malloc(s.st_size + 1);
rmbuf[s.st_size] = 0;
fread(rmbuf, s.st_size, 1, fr);
addstring(&str, "<pre><code>%h</code></pre>\n", rmbuf);
fclose(fr);
}
}
addstring(&str, " <hr>\n");
addstring(&str, " <address>%s Server at %s Port %d</address>\n", tw_server, name, port);
addstring(&str, " </body>\n");
addstring(&str, "</html>\n");
tw_process_page(s, sock, tw_http_status(200), "text/html", NULL, str, strlen(str), 0, 0);
free(str);
}
}
} else {
char* ext = NULL;
for(i = strlen(req.path) - 1; i >= 0; i--) {
if(req.path[i] == '.') {
ext = cm_strdup(req.path + i);
break;
} else if(req.path[i] == '/') {
break;
}
}
char* mime = tw_get_mime(ext, vhost_entry);
if(ext != NULL) free(ext);
FILE* f = fopen(path, "rb");
tw_process_page(s, sock, tw_http_status(200), mime, f, NULL, st.st_size, st.st_mtime, cmtime);
fclose(f);
}
} else {
tw_http_error(s, sock, 404, name, port);
}
free(path);
}
free(vhost);
free(host);
tw_free_request(&req);
} else if(ret == -1) {
} else {
tw_http_error(s, sock, 400, name, port);
}
cleanup:
#ifndef NO_SSL
if(sslworks) {
SSL_shutdown(s);
}
SSL_free(s);
close_socket(sock);
#endif
#ifdef __MINGW32__
_endthreadex(0);
#endif
;
}
void tw_server_loop(void) {
struct timeval tv;
while(1) {
FD_ZERO(&fdset);
int i;
for(i = 0; i < sockcount; i++) {
FD_SET(sockets[i], &fdset);
}
tv.tv_sec = 1;
tv.tv_usec = 0;
int ret = select(FD_SETSIZE, &fdset, NULL, NULL, &tv);
if(ret == -1) {
break;
} else if(ret > 0) {
/* connection */
int i;
for(i = 0; i < sockcount; i++) {
if(FD_ISSET(sockets[i], &fdset)) {
SOCKADDR claddr;
int clen = sizeof(claddr);
int sock = accept(sockets[i], (struct sockaddr*)&claddr, &clen);
cm_log("Server", "New connection accepted");
#ifdef __MINGW32__
HANDLE thread;
struct pass_entry* e = malloc(sizeof(*e));
e->sock = sock;
e->ssl = config.ports[i] & (1ULL << 32);
e->port = config.ports[i];
e->addr = claddr;
thread = (HANDLE)_beginthreadex(NULL, 0, tw_server_pass, e, 0, NULL);
#else
pid_t pid = fork();
if(pid == 0) {
tw_server_pass(sock, config.ports[i] & (1ULL << 32), config.ports[i], claddr);
_exit(0);
} else {
close_socket(sock);
}
#endif
}
}
}
}
}