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/* $Id: server.c 19 2024-09-14 00:51:41Z nishi $ */
#define SOURCE
#include "tw_server.h"
#include "tw_ssl.h"
#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 <cm_string.h>
#include <cm_log.h>
#ifdef __MINGW32__
#include <winsock2.h>
#include <process.h>
#define NO_IPV6
#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;
#ifdef NO_IPV6
#define SOCKADDR struct sockaddr_in
#else
#define SOCKADDR struct sockaddr_in6
#endif
SOCKADDR addresses[MAX_PORTS];
int sockets[MAX_PORTS];
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) {
if(ssl == NULL) {
return recv(s, data, len, 0);
} else {
return SSL_read(ssl, data, len);
}
}
size_t tw_write(SSL* ssl, int s, void* data, size_t len) {
if(ssl == NULL) {
return send(s, data, len, 0);
} else {
return SSL_write(ssl, data, len);
}
}
#define ERROR_400 \
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" \
"<html>\n" \
" <head>\n" \
" <title>400 Bad Request</title>" \
" </head>\n" \
" <body>\n" \
" <h1>Bad Request</h1>\n" \
" <hr>\n" \
" ", \
address, \
"\n" \
" </body>\n" \
"</html>\n"
#define ERROR_401 \
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" \
"<html>\n" \
" <head>\n" \
" <title>401 Unauthorized</title>" \
" </head>\n" \
" <body>\n" \
" <h1>Unauthorized</h1>\n" \
" <hr>\n" \
" ", \
address, \
"\n" \
" </body>\n" \
"</html>\n"
#define ERROR_403 \
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" \
"<html>\n" \
" <head>\n" \
" <title>403 Forbidden</title>" \
" </head>\n" \
" <body>\n" \
" <h1>Forbidden</h1>\n" \
" <hr>\n" \
" ", \
address, \
"\n" \
" </body>\n" \
"</html>\n"
#define ERROR_404 \
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" \
"<html>\n" \
" <head>\n" \
" <title>404 Not Found</title>" \
" </head>\n" \
" <body>\n" \
" <h1>Not Found</h1>\n" \
" <hr>\n" \
" ", \
address, \
"\n" \
" </body>\n" \
"</html>\n"
void tw_process_page(SSL* ssl, int sock, const char* status, const char* type, const unsigned char* doc, size_t size) {
char construct[512];
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);
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);
tw_write(ssl, sock, "Content-Length: ", 7 + 7 + 2);
tw_write(ssl, sock, construct, strlen(construct));
tw_write(ssl, sock, "\r\n", 2);
tw_write(ssl, sock, "\r\n", 2);
size_t incr = 0;
while(1) {
tw_write(ssl, sock, (unsigned char*)doc + incr, size < 128 ? size : 128);
incr += 128;
if(size <= 128) break;
size -= 128;
}
}
const char* tw_http_status(int code) {
if(code == 400) {
return "400 Bad Request";
} 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);
if(code == 400) {
return cm_strcat3(ERROR_400);
} else {
return cm_strcat3(ERROR_400);
}
}
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", str, strlen(str));
free(str);
}
#ifdef __MINGW32__
struct pass_entry {
int sock;
int port;
bool ssl;
};
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;
free(ptr);
#else
void tw_server_pass(int sock, bool ssl, int port) {
#endif
char* name = config.hostname;
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;
}
struct tw_http_request req;
int ret = tw_http_parse(s, sock, &req);
if(ret == 0) {
} else {
tw_http_error(s, sock, 400, name, port);
}
cleanup:
if(sslworks) {
SSL_shutdown(s);
}
SSL_free(s);
close_socket(sock);
#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];
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]);
_exit(0);
} else {
close_socket(sock);
}
#endif
}
}
}
}
}