source: Main/trunk/Server/server.c@ 15

/* $Id: server.c 15 2024-09-13 13:49:53Z nishi $ */

#include "tw_server.h"

#include "tw_ssl.h"
#include "tw_config.h"

#include <unistd.h>
#include <string.h>
#include <stdbool.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;

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;
}

#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;
        }
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
                                }
                        }
                }
        }
}