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server.c
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server.c
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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <string.h>
#include <errno.h>
// 包入tun相关的头部
#include <net/if.h>
#include <linux/if_tun.h>
// 包入网络相关的头部
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <sys/epoll.h>
// 包入路由相关的头部
#include <net/route.h>
// 包入openssl的头部
#include <openssl/ssl.h>
// 包入json解析头部
#include "yyjson.h"
// 监听异常中断
#include "exception.h"
#define MAXDATASIZE 2*1024*1024
#define MAX_EVENT 1024
#define MAX_CONNECT 1024
#define MTU_SIZE 1500
const char PAGE404[] = "HTTP/1.1 404 Not Found\r\nServer: nginx/1.14.2\r\nDate: %a, %d %b %Y %H:%M:%S GMT\r\n" \
"Content-Type: text/html\r\nContent-Length: 169\r\nConnection: keep-alive\r\n\r\n" \
"<html>\r\n<head><title>404 Not Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 Not Found</h1></center>\r\n" \
"<hr><center>nginx/1.14.2</center>\r\n</body>\r\n</html>\r\n";
const char PAGE400[] = "HTTP/1.1 400 Bad Request\r\nServer: nginx/1.14.2\r\nDate: %a, %d %b %Y %H:%M:%S GMT\r\n" \
"Content-Type: text/html\r\nContent-Length: 173\r\nConnection: close\r\n\r\n" \
"<html>\r\n<head><title>400 Bad Request</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>400 Bad Request</h1></center>\r\n" \
"<hr><center>nginx/1.14.2</center>\r\n</body>\r\n</html>\r\n";
const char PAGE101[] = "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\n\r\n";
struct PACKAGELIST {
unsigned char data[MTU_SIZE + 14];
unsigned int size;
struct PACKAGELIST *tail;
};
struct PACKAGELIST *remainpackagelisthead = NULL;
struct CLIENTLIST {
struct FDCLIENT *fdclient; // 与自己相关联的fdclient对象
unsigned char mac[6]; // 该端口的源mac地址
struct PACKAGELIST *packagelisthead; // 发给自己这个端口的数据包列表头部
struct PACKAGELIST *packagelisttail; // 发给自己这个端口的数据包列表尾部
unsigned char remainpackage[MTU_SIZE + 14]; // 自己接收到的数据出现数据不全，将不全的数据存在这里，等待新的数据将其补全
unsigned int remainsize; // 不全的数据大小
unsigned char canwrite;
struct CLIENTLIST *hashhead; // 从哈希表中寻找上一个clientlist
struct CLIENTLIST *hashtail; // 从哈希表中寻找下一个clientlist
struct CLIENTLIST *head; // 从remainclientlist中寻找下一个可用的clientlist
struct CLIENTLIST *tail; // 从remainclientlist中寻找下一个可用的clientlist
struct CLIENTLIST *writetail; // 用于存储在readdata中发现有写入过程的node
};
struct CLIENTLIST *clientlisthead = NULL;
struct CLIENTLIST *remainclientlisthead = NULL;
struct CLIENTLIST *machashlist[0x10000]; // mac地址的hash表，用于快速找到对应的mac
struct CLIENTLIST *tapclient;
struct FDCLIENT {
int fd;
SSL *tls;
unsigned char tlsconnected;
unsigned char watch;
struct CLIENTLIST *client;
struct FDCLIENT *tail; // 从remainclientlist中寻找下一个可用的clientlist
};
struct FDCLIENT *remainfdclienthead = NULL;
struct FDCLIENT *fdserver;
int epollfd;
SSL_CTX *ctx;
unsigned char readbuf[MAXDATASIZE];
struct KEYS {
unsigned char key[33];
struct KEYS *tail;
};
struct ROUTERS {
unsigned char dstip[4];
unsigned char dstmask[4];
unsigned char gateway[4];
struct ROUTERS *tail;
};
struct CONFIG {
unsigned short bindport;
bool tcpkeepalive;
unsigned char tcpkeepidle;
unsigned char tcpkeepintvl;
unsigned char tcpkeepcnt;
bool ssl;
unsigned char crtpath[256];
unsigned char keypath[256];
unsigned char ip[4];
unsigned char mask[4];
unsigned char httppath[256];
unsigned char tapname[16];
struct KEYS *keys;
struct ROUTERS *routers;
};
struct CONFIG c;
int setnonblocking (int fd) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
printf("get flags fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
return -1;
}
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) {
printf("set flags fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
return -2;
}
return 0;
}
int addtoepoll (struct FDCLIENT *fdclient, uint32_t flags) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
struct epoll_event ev;
ev.data.ptr = fdclient;
ev.events = EPOLLERR | EPOLLHUP | EPOLLRDHUP | flags; // 水平触发，保证所有数据都能读到
return epoll_ctl(epollfd, EPOLL_CTL_ADD, fdclient->fd, &ev);
}
int modepoll (struct FDCLIENT *fdclient, uint32_t flags) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
struct epoll_event ev;
ev.data.ptr = fdclient;
ev.events = EPOLLERR | EPOLLHUP | EPOLLRDHUP | flags; // 水平触发，保证所有数据都能读到
return epoll_ctl(epollfd, EPOLL_CTL_MOD, fdclient->fd, &ev);
}
int tap_alloc () {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
int fd = open("/dev/net/tun", O_RDWR);
if (fd < 0) {
printf("open tun node fail, in %s, at %d\n", __FILE__, __LINE__);
return -1;
}
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strcpy(ifr.ifr_name, c.tapname);
if (ioctl(fd, TUNSETIFF, (void*) &ifr) < 0) {
printf("ioctl tun node fail, in %s, at %d\n", __FILE__, __LINE__);
close(fd);
return -2;
}
printf("create tap device success, in %s, at %d\n", __FILE__, __LINE__);
int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (ioctl(socket_fd, SIOCGIFFLAGS, (void *) &ifr) < 0) {
printf("ioctl SIOCGIFFLAGS fail, in %s, at %d\n", __FILE__, __LINE__);
close(socket_fd);
close(fd);
return -3;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(socket_fd, SIOCSIFFLAGS, &ifr) < 0) {
printf("up tap device fail, in %s, at %d\n", __FILE__, __LINE__);
close(socket_fd);
close(fd);
return -4;
}
printf("up tap device success, in %s, at %d\n", __FILE__, __LINE__);
struct sockaddr_in sin;
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr, c.ip, 4);
memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
if (ioctl(socket_fd, SIOCSIFADDR, &ifr) < 0) {
printf("set ip addr for tap device fail, in %s, at %d\n", __FILE__, __LINE__);
close(socket_fd);
close(fd);
return -5;
}
printf("set ip addr for tap device to %d.%d.%d.%d success, in %s, at %d\n", c.ip[0], c.ip[1], c.ip[2], c.ip[3], __FILE__, __LINE__);
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr, c.mask, 4);
memcpy(&ifr.ifr_netmask, &sin, sizeof(struct sockaddr));
if (ioctl(socket_fd, SIOCSIFNETMASK, &ifr) < 0) {
printf("set netmask for tap device fail, in %s, at %d\n", __FILE__, __LINE__);
close(socket_fd);
close(fd);
return -6;
}
printf("set netmask for tap device to %d.%d.%d.%d success, in %s, at %d\n", c.mask[0], c.mask[1], c.mask[2], c.mask[3], __FILE__, __LINE__);
struct rtentry rt;
struct ROUTERS *routers = c.routers;
while (routers != NULL) {
memset(&rt, 0, sizeof(struct rtentry));
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr, routers->dstip, 4);
memcpy(&rt.rt_dst, &sin, sizeof(struct sockaddr_in));
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr, routers->dstmask, 4);
memcpy(&rt.rt_genmask, &sin, sizeof(struct sockaddr_in));
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
memcpy(&sin.sin_addr, routers->gateway, 4);
memcpy(&rt.rt_gateway, &sin, sizeof(struct sockaddr_in));
rt.rt_flags = RTF_GATEWAY;
if (ioctl(socket_fd, SIOCADDRT, &rt) < 0) {
printf("add static route %d.%d.%d.%d mask %d.%d.%d.%d via %d.%d.%d.%d fail, in %s, at %d\n", routers->dstip[0], routers->dstip[1], routers->dstip[2], routers->dstip[3], routers->dstmask[0], routers->dstmask[1], routers->dstmask[2], routers->dstmask[3], routers->gateway[0], routers->gateway[1], routers->gateway[2], routers->gateway[3], __FILE__, __LINE__);
} else {
printf("add static route %d.%d.%d.%d mask %d.%d.%d.%d via %d.%d.%d.%d success, in %s, at %d\n", routers->dstip[0], routers->dstip[1], routers->dstip[2], routers->dstip[3], routers->dstmask[0], routers->dstmask[1], routers->dstmask[2], routers->dstmask[3], routers->gateway[0], routers->gateway[1], routers->gateway[2], routers->gateway[3], __FILE__, __LINE__);
}
struct ROUTERS *r = routers;
routers = routers->tail;
free(r);
}
close(socket_fd);
if (setnonblocking(fd) < 0) {
printf("set nonblocking fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -8;
}
printf("tap device name is %s, tapfd %d, in %s, at %d\n", ifr.ifr_name, fd, __FILE__, __LINE__);
if (remainclientlisthead) {
tapclient = remainclientlisthead;
remainclientlisthead = remainclientlisthead->tail;
} else {
tapclient = (struct CLIENTLIST*) malloc(sizeof(struct CLIENTLIST));
if (tapclient == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
close(fd);
return -9;
}
}
memset(tapclient->mac, 0, 6);
tapclient->packagelisthead = NULL;
tapclient->remainsize = 0;
tapclient->canwrite = 1;
tapclient->hashhead = NULL;
tapclient->hashtail = NULL;
tapclient->head = NULL;
if (clientlisthead) {
clientlisthead->head = tapclient;
}
tapclient->tail = clientlisthead;
clientlisthead = tapclient;
struct FDCLIENT* fdclient;
if (remainfdclienthead) { // 有存货，直接拿出来用
fdclient = remainfdclienthead;
remainfdclienthead = remainfdclienthead->tail;
} else { // 没有存货，malloc一个
fdclient = (struct FDCLIENT*) malloc(sizeof(struct FDCLIENT));
if (fdclient == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
clientlisthead = clientlisthead->tail;
tapclient->tail = remainclientlisthead;
remainclientlisthead = tapclient;
close(fd);
return -10;
}
}
tapclient->fdclient = fdclient;
fdclient->fd = fd;
fdclient->tls = NULL;
fdclient->tlsconnected = 0;
fdclient->watch = 0;
fdclient->client = tapclient;
if (addtoepoll(fdclient, EPOLLIN)) {
printf("tapfd add to epoll fail, in %s, at %d\n", __FILE__, __LINE__);
fdclient->tail = remainfdclienthead;
remainfdclienthead = fdclient;
clientlisthead = clientlisthead->tail;
tapclient->tail = remainclientlisthead;
remainclientlisthead = tapclient;
close(fd);
return -11;
}
fdclient->watch = 1;
return 0;
}
int create_socketfd () {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
struct sockaddr_in sin;
int fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
printf("run socket function is fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
return -1;
}
unsigned int socksval = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &socksval, sizeof(socksval))) {
printf("set socket reuseaddr fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -2;
}
socksval = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &socksval, sizeof(socksval))) {
printf("set socket reuseport fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -3;
}
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET; // ipv4
sin.sin_addr.s_addr = INADDR_ANY; // 本机任意ip
sin.sin_port = htons(c.bindport);
if (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) < 0) {
printf("bind port %d fail, fd:%d, in %s, at %d\n", c.bindport, fd, __FILE__, __LINE__);
close(fd);
return -4;
}
if (listen(fd, MAX_CONNECT) < 0) {
printf("listen port %d fail, fd:%d, in %s, at %d\n", c.bindport, fd, __FILE__, __LINE__);
close(fd);
return -5;
}
if (remainfdclienthead) { // 有存货，直接拿出来用
fdserver = remainfdclienthead;
remainfdclienthead = remainfdclienthead->tail;
} else { // 没有存货，malloc一个
fdserver = (struct FDCLIENT*) malloc(sizeof(struct FDCLIENT));
if (fdserver == NULL) {
printf("malloc fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -6;
}
}
fdserver->fd = fd;
fdserver->watch = 0;
fdserver->client = NULL;
if (addtoepoll(fdserver, EPOLLIN)) {
printf("serverfd add to epoll fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
fdserver->tail = remainfdclienthead;
remainfdclienthead = fdserver;
close(fd);
return -7;
}
fdserver->watch = 1;
return 0;
}
int addclient (int serverfd) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
struct sockaddr_in sin;
socklen_t in_addr_len = sizeof(struct sockaddr_in);
int fd = accept(serverfd, (struct sockaddr*)&sin, &in_addr_len);
if (fd < 0) {
printf("accept a new fd fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
return -1;
}
printf("new socket:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
if (setnonblocking(fd) < 0) { // 设置为非阻塞IO
printf("set nonblocking fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -2;
}
unsigned int socksval = 1;
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (unsigned char*)&socksval, sizeof(socksval))) { // 关闭Nagle协议
printf("close Nagle protocol fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -3;
}
if (c.tcpkeepalive) {
socksval = 1;
if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (unsigned char*)&socksval, sizeof(socksval))) { // 启动tcp心跳包
printf("set socket keepalive fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -4;
}
socksval = c.tcpkeepidle;
if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, (unsigned char*)&socksval, sizeof(socksval))) { // 设置tcp心跳包参数
printf("set socket keepidle fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -5;
}
socksval = c.tcpkeepintvl;
if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, (unsigned char*)&socksval, sizeof(socksval))) { // 设置tcp心跳包参数
printf("set socket keepintvl fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -6;
}
socksval = c.tcpkeepcnt;
if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, (unsigned char*)&socksval, sizeof(socksval))) { // 设置tcp心跳包参数
printf("set socket keepcnt fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -7;
}
}
// 修改发送缓冲区大小
socklen_t socksval_len = sizeof(socksval);
if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, (unsigned char*)&socksval, &socksval_len)) {
printf("get send buffer fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -8;
}
printf("old send buffer is %d, socksval_len:%d, fd:%d, in %s, at %d\n", socksval, socksval_len, fd, __FILE__, __LINE__);
socksval = MAXDATASIZE;
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (unsigned char*)&socksval, sizeof (socksval))) {
printf("set send buffer fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -9;
}
socksval_len = sizeof(socksval);
if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, (unsigned char*)&socksval, &socksval_len)) {
printf("get send buffer fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -10;
}
printf("new send buffer is %d, socksval_len:%d, fd:%d, in %s, at %d\n", socksval, socksval_len, fd, __FILE__, __LINE__);
// 修改接收缓冲区大小
socksval_len = sizeof(socksval);
if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, (unsigned char*)&socksval, &socksval_len)) {
printf("get receive buffer fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -11;
}
printf("old receive buffer is %d, socksval_len:%d, fd:%d, in %s, at %d\n", socksval, socksval_len, fd, __FILE__, __LINE__);
socksval = MAXDATASIZE;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char*)&socksval, sizeof(socksval))) {
printf("set receive buffer fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -12;
}
socksval_len = sizeof(socksval);
if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, (unsigned char*)&socksval, &socksval_len)) {
printf("get receive buffer fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -13;
}
printf("new receive buffer is %d, socksval_len:%d, fd:%d, in %s, at %d\n", socksval, socksval_len, fd, __FILE__, __LINE__);
struct FDCLIENT *fdclient;
if (remainfdclienthead) { // 有存货，直接拿出来用
fdclient = remainfdclienthead;
remainfdclienthead = remainfdclienthead->tail;
} else { // 没有存货，malloc一个
fdclient = (struct FDCLIENT*) malloc(sizeof(struct FDCLIENT));
if (fdclient == NULL) {
printf("malloc new fdclient object fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
close(fd);
return -14;
}
}
fdclient->fd = fd;
fdclient->watch = 0;
fdclient->client = NULL;
uint32_t flags;
if (ctx) {
SSL *tls = SSL_new(ctx);
if (tls == NULL) {
printf("SSL new fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
fdclient->tail = remainfdclienthead;
remainfdclienthead = fdclient;
close(fd);
return -15;
}
if (SSL_set_fd(tls, fd) != 1) {
printf("SSL set fd fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
fdclient->tail = remainfdclienthead;
remainfdclienthead = fdclient;
SSL_shutdown(tls);
SSL_free(tls);
close(fd);
return -16;
}
fdclient->tls = tls;
int r_code = SSL_accept(tls);
if (r_code != 1) {
int errcode = SSL_get_error(tls, r_code);
if (errcode == SSL_ERROR_WANT_WRITE) {
flags = EPOLLOUT;
} else if (errcode == SSL_ERROR_WANT_READ) {
flags = EPOLLIN;
} else {
perror("tls connect error");
printf("errno:%d, errcode:%d, in %s, at %d\n", errno, errcode, __FILE__, __LINE__);
fdclient->tail = remainfdclienthead;
remainfdclienthead = fdclient;
SSL_shutdown(tls);
SSL_free(tls);
close(fd);
return -17;
}
fdclient->tlsconnected = 0;
} else {
fdclient->tlsconnected = 1;
flags = EPOLLIN;
}
} else {
fdclient->tls = NULL;
fdclient->tlsconnected = 0;
flags = EPOLLIN;
}
if (addtoepoll(fdclient, flags)) {
printf("add to epoll fail, fd:%d, in %s, at %d\n", fd, __FILE__, __LINE__);
fdclient->tail = remainfdclienthead;
remainfdclienthead = fdclient;
if (fdclient->tls) {
SSL_shutdown(fdclient->tls);
SSL_free(fdclient->tls);
}
close(fd);
return -18;
}
fdclient->watch = 1;
return 0;
}
int removeclient (struct FDCLIENT *fdclient) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
if (!fdclient->watch) {
return 0;
}
if (epoll_ctl(epollfd, EPOLL_CTL_DEL, fdclient->fd, NULL)) {
printf("errno: %d, fd:%d, in %s, at %d\n", errno, fdclient->fd, __FILE__, __LINE__);
perror("EPOLL CTL DEL fail");
}
fdclient->watch = 0;
if (fdclient->tls) {
SSL_shutdown(fdclient->tls);
SSL_free(fdclient->tls);
}
struct CLIENTLIST *client = fdclient->client;
close(fdclient->fd);
if (client) { // 已经注册成功
if (client->mac[0] != 0x00 || client->mac[1] != 0x00 || client->mac[2] != 0x00 || client->mac[3] != 0x00 || client->mac[4] != 0x00 || client->mac[5] != 0x00) { // 已经学习完毕
if (client->hashhead) {
client->hashhead->hashtail = client->hashtail;
} else {
machashlist[256 * client->mac[4] + client->mac[5]] = client->hashtail;
}
if (client->hashtail) {
client->hashtail->hashhead = client->hashhead;
}
}
struct PACKAGELIST *package = client->packagelisthead;
while (package) {
struct PACKAGELIST *tmppackage = package;
package = package->tail;
tmppackage->tail = remainpackagelisthead;
remainpackagelisthead = tmppackage;
}
if (client->head) {
client->head->tail = client->tail;
} else {
clientlisthead = client->tail;
}
if (client->tail) {
client->tail->head = client->head;
}
client->tail = remainclientlisthead;
remainclientlisthead = client;
printf("host %02x:%02x:%02x:%02x:%02x:%02x disconnect, in %s, at %d\n", client->mac[0], client->mac[1], client->mac[2], client->mac[3], client->mac[4], client->mac[5], __FILE__, __LINE__);
}
fdclient->tail = remainfdclienthead;
remainfdclienthead = fdclient;
if (client == tapclient) { // 基本不可能情况
printf("errno: %d, exit 0, in %s, at %d\n", errno, __FILE__, __LINE__);
perror("tap driver lose");
exit(0);
}
return 0;
}
int writenode (struct CLIENTLIST *writeclient) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
for (struct CLIENTLIST *client = writeclient ; client != NULL ; client = client->writetail) {
struct PACKAGELIST *package = client->packagelisthead;
client->packagelisthead = NULL;
while (package) {
ssize_t len;
if (client->fdclient->tls) {
len = SSL_write(client->fdclient->tls, package->data, package->size);
if (len < 0) {
client->fdclient->tlsconnected = 0;
int errcode = SSL_get_error(client->fdclient->tls, len);
if (errcode == SSL_ERROR_WANT_READ) {
if (modepoll(client->fdclient, EPOLLIN)) {
perror("modify epoll error");
printf("fd:%d, errno:%d, ssl errcode:%d, in %s, at %d\n", client->fdclient->fd, errno, errcode, __FILE__, __LINE__);
removeclient(client->fdclient);
break;
}
client->packagelisthead = package;
break;
} else if (errcode == SSL_ERROR_WANT_WRITE) {
client->packagelisthead = package;
break;
} else {
printf("fd:%d, errno:%d, ssl errcode:%d, in %s, at %d\n", client->fdclient->fd, errno, errcode, __FILE__, __LINE__);
removeclient(client->fdclient);
break;
}
}
} else {
len = write(client->fdclient->fd, package->data, package->size);
}
if (len < 0) {
if (errno != EAGAIN) {
printf("errno:%d, in %s, at %d\n", errno, __FILE__, __LINE__);
if (client == tapclient) {
perror("tap write error");
} else {
perror("socket write error");
}
removeclient(client->fdclient);
break;
}
client->packagelisthead = package;
if (client->canwrite) { // 之前缓冲区是可以写入的，现在不行了
if (modepoll(client->fdclient, EPOLLIN | EPOLLOUT)) { // 监听可写事件
printf("modepoll fail, in %s, at %d\n", __FILE__, __LINE__);
removeclient(client->fdclient);
break;
}
client->canwrite = 0;
}
break;
}
if (len < package->size) { // 缓冲区不足，已无法继续写入数据。
unsigned int size = package->size - len;
memcpy(package->data, package->data + len, size);
package->size = size;
client->packagelisthead = package;
if (client->canwrite) { // 之前缓冲区是可以写入的，现在不行了
if (modepoll(client->fdclient, EPOLLIN | EPOLLOUT)) { // 监听可写事件
printf("modepoll fail, in %s, at %d\n", __FILE__, __LINE__);
removeclient(client->fdclient);
break;
}
client->canwrite = 0;
}
break;
}
if (client->canwrite == 0) { // 缓冲区尚有空间，并且之前已经提示不足
if (modepoll(client->fdclient, EPOLLIN)) { // 取消监听可写事件
printf("modepoll fail, in %s, at %d\n", __FILE__, __LINE__);
client->packagelisthead = package;
removeclient(client->fdclient);
break;
}
client->canwrite = 1;
}
struct PACKAGELIST *tmppackage = package;
package = package->tail;
tmppackage->tail = remainpackagelisthead;
remainpackagelisthead = tmppackage;
}
}
return 0;
}
struct CLIENTLIST* broadcastdata (struct CLIENTLIST *sourceclient, unsigned char *buff, int32_t packagesize) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
struct CLIENTLIST *writeclient = NULL;
for (struct CLIENTLIST *targetclient = clientlisthead ; targetclient != NULL ; targetclient = targetclient->tail) {
if (targetclient == sourceclient) {
continue;
}
struct PACKAGELIST *package;
if (remainpackagelisthead) { // 全局数据包回收站不为空
package = remainpackagelisthead;
remainpackagelisthead = remainpackagelisthead->tail;
} else {
package = (struct PACKAGELIST*) malloc(sizeof(struct PACKAGELIST));
if (package == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
continue;
}
}
if (targetclient == tapclient) {
memcpy(package->data, buff + 2, packagesize - 2);
package->size = packagesize - 2;
} else {
memcpy(package->data, buff, packagesize);
package->size = packagesize;
}
package->tail = NULL;
if (targetclient->packagelisthead == NULL) {
targetclient->packagelisthead = package;
targetclient->packagelisttail = targetclient->packagelisthead;
} else {
targetclient->packagelisttail->tail = package;
targetclient->packagelisttail = targetclient->packagelisttail->tail;
}
if (targetclient->canwrite) {
targetclient->writetail = writeclient;
writeclient = targetclient;
}
}
return writeclient;
}
int checkkeys (char *key) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
struct KEYS *keys = c.keys;
while (keys != NULL) {
if (!strcmp(keys->key, key)) {
return 1;
}
keys = keys->tail;
}
return 0;
}
int readdata (struct FDCLIENT *fdclient) {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
static unsigned char *readbuff = NULL; // 这里是用于存储全部的需要写入的数据buf，
static unsigned int maxtotalsize = 0;
struct CLIENTLIST *sourceclient = fdclient->client;
ssize_t len;
if (sourceclient == tapclient) { // tap驱动，原始数据，需要自己额外添加数据包长度。
len = read(fdclient->fd, readbuf + 2, MAXDATASIZE); // 这里最大只可能是1514
if (len < 0) {
if (errno != EAGAIN) {
printf("errno:%d, in %s, at %d\n", errno, __FILE__, __LINE__);
perror("tap read error");
removeclient(fdclient);
}
return -1;
}
readbuf[0] = len >> 8;
readbuf[1] = len & 0xff;
len += 2;
} else { // 网络套接字。
if (fdclient->tls) {
len = SSL_read(fdclient->tls, readbuf, MAXDATASIZE);
if (len < 0) {
fdclient->tlsconnected = 0;
int errcode = SSL_get_error(fdclient->tls, len);
if (errcode == SSL_ERROR_WANT_WRITE) {
if (modepoll(fdclient, EPOLLOUT)) {
printf("modify epoll fd fail, in %s, at %d\n", __FILE__, __LINE__);
printf("fd:%d, errno:%d, ssl errcode:%d, in %s, at %d\n", fdclient->fd, errno, errcode, __FILE__, __LINE__);
removeclient(fdclient);
return -1;
}
return 0;
} else if (errcode == SSL_ERROR_WANT_READ) {
return 0;
} else {
removeclient(fdclient);
printf("fd:%d, errno:%d, ssl errcode:%d, in %s, at %d\n", fdclient->fd, errno, errcode, __FILE__, __LINE__);
return -2;
}
}
} else {
len = read(fdclient->fd, readbuf, MAXDATASIZE);
}
if (len < 0) {
if (errno != EAGAIN) {
printf("errno:%d, in %s, at %d\n", errno, __FILE__, __LINE__);
perror("socket read error");
removeclient(fdclient);
}
return -3;
}
}
readbuf[len] = '\0';
if (sourceclient == NULL) { // 用户没有找到
if (remainclientlisthead) {
sourceclient = remainclientlisthead;
remainclientlisthead = remainclientlisthead->tail;
} else {
sourceclient = (struct CLIENTLIST*) malloc(sizeof(struct CLIENTLIST));
if (sourceclient == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
removeclient(fdclient);
return -4;
}
}
memset(sourceclient->mac, 0, 6);
sourceclient->fdclient = fdclient;
sourceclient->remainsize = 0;
sourceclient->canwrite = 1;
struct PACKAGELIST *package;
if (remainpackagelisthead) { // 全局数据包回收站不为空
package = remainpackagelisthead;
remainpackagelisthead = remainpackagelisthead->tail;
} else {
package = (struct PACKAGELIST*) malloc(sizeof(struct PACKAGELIST));
if (package == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
return -5;
}
}
package->tail = NULL;
sourceclient->packagelisthead = package;
unsigned char *headend = strstr(readbuf, "\r\n\r\n");
unsigned char httppath[256];
unsigned char httpprot[16];
if (sscanf(readbuf, "GET %s %s\r\n", httppath, httpprot) != 2 || strcmp(httpprot, "HTTP/1.1") || headend == NULL) {
time_t now;
time(&now);
int len = strftime(package->data, MTU_SIZE+14, PAGE400, gmtime(&now));
package->size = len;
sourceclient->writetail = NULL;
writenode(sourceclient);
removeclient(fdclient);
return -6;
}
*headend = '\0'; // 给http头部结尾添加字符串结束符，不解析body。
unsigned char *key = strstr(readbuf, "Authorization: ");
if (key != NULL) {
key = key + 15;
unsigned char *keyend = strchr(key, '\r');
if (keyend != NULL) {
*keyend = '\0';
}
}
if (key == NULL || strcmp(httppath, c.httppath) || checkkeys(key)) {
time_t now;
time(&now);
int len = strftime(package->data, MTU_SIZE+14, PAGE404, gmtime(&now));
package->size = len;
sourceclient->writetail = NULL;
writenode(sourceclient);
removeclient(fdclient);
return -7;
}
memcpy(package->data, PAGE101, sizeof(PAGE101)-1);
package->size = sizeof(PAGE101)-1;
sourceclient->writetail = NULL;
writenode(sourceclient);
if (clientlisthead) {
clientlisthead->head = sourceclient;
}
sourceclient->head = NULL;
sourceclient->tail = clientlisthead;
clientlisthead = sourceclient;
fdclient->client = sourceclient;
printf("add client success, fd:%d, in %s, at %d\n", sourceclient->fdclient->fd, __FILE__, __LINE__);
return 0;
}
unsigned int offset = 0;
unsigned int totalsize;
unsigned char *buff;
if (sourceclient->remainsize > 0) {
totalsize = sourceclient->remainsize + len;
if (totalsize > maxtotalsize) {
if (maxtotalsize > 0) {
free(readbuff);
}
readbuff = (unsigned char*) malloc(totalsize * sizeof(unsigned char));
if (readbuff == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
maxtotalsize = 0;
return -9;
}
maxtotalsize = totalsize;
}
memcpy(readbuff, sourceclient->remainpackage, sourceclient->remainsize);
memcpy(readbuff + sourceclient->remainsize, readbuf, len);
sourceclient->remainsize = 0;
buff = readbuff;
} else {
totalsize = len;
buff = readbuf;
}
struct CLIENTLIST *writeclient = NULL;
while (offset < totalsize) {
if (offset + 60 > totalsize) { // mac帧单个最小必须是60个，小于这个的数据包一定不完整
int remainsize = totalsize - offset;
memcpy(sourceclient->remainpackage, buff + offset, remainsize);
sourceclient->remainsize = remainsize;
break;
}
unsigned int packagesize = 256 * buff[offset] + buff[offset+1] + 2; // 当前数据帧大小
if (offset + packagesize > totalsize) {
int remainsize = totalsize - offset;
memcpy(sourceclient->remainpackage, buff + offset, remainsize);
sourceclient->remainsize = remainsize;
break;
}
// 自学习算法开始
unsigned int srchash = 256 * buff[offset+12] + buff[offset+13];
if (sourceclient != machashlist[srchash]) {
if (sourceclient->mac[0] != 0x00 || sourceclient->mac[1] != 0x00 || sourceclient->mac[2] != 0x00 || sourceclient->mac[3] != 0x00 || sourceclient->mac[4] != 0x00 || sourceclient->mac[5] != 0x00) {
unsigned int oldhash = 256 * sourceclient->mac[5] + sourceclient->mac[6];
if (sourceclient->hashhead) {
sourceclient->hashhead->hashtail = sourceclient->hashtail;
} else {
machashlist[oldhash] = sourceclient->hashtail;
}
if (sourceclient->hashtail) {
sourceclient->hashtail->hashhead = sourceclient->hashhead;
}
sourceclient->hashhead = NULL;
}
if (machashlist[srchash]) {
machashlist[srchash]->hashhead = sourceclient;
}
sourceclient->hashtail = machashlist[srchash];
machashlist[srchash] = sourceclient;
}
memcpy(sourceclient->mac, buff + offset + 8, 6);
// 自学习算法结束
unsigned char targetmac[6];
memcpy(targetmac, buff + offset + 2, 6);
if (targetmac[0] == 0xff && targetmac[1] == 0xff && targetmac[2] == 0xff && targetmac[3] == 0xff && targetmac[4] == 0xff && targetmac[5] == 0xff) { // 广播帧
writeclient = broadcastdata(sourceclient, buff + offset, packagesize);
offset += packagesize;
continue;
}
unsigned int dsthash = 256 * buff[offset+6] + buff[offset+7];
struct CLIENTLIST *targetclient;
for (targetclient = machashlist[dsthash] ; targetclient != NULL ; targetclient = targetclient->tail) {
if (!memcmp(targetclient->mac, targetmac, 4)) {
break;
}
}
if (targetclient == NULL) { // mac地址表中不存在，使用广播策略
writeclient = broadcastdata(sourceclient, buff + offset, packagesize);
offset += packagesize;
continue;
}
struct PACKAGELIST *package;
if (remainpackagelisthead) { // 全局数据包回收站不为空
package = remainpackagelisthead;
remainpackagelisthead = remainpackagelisthead->tail;
} else {
package = (struct PACKAGELIST*) malloc(sizeof(struct PACKAGELIST));
if (package == NULL) {
printf("malloc fail, in %s, at %d\n", __FILE__, __LINE__);
offset += packagesize;
continue;
}
}
if (targetclient == tapclient) {
memcpy(package->data, buff + offset + 2, packagesize - 2);
package->size = packagesize - 2;
} else {
memcpy(package->data, buff + offset, packagesize);
package->size = packagesize;
}
package->tail = NULL;
if (targetclient->packagelisthead == NULL) {
targetclient->packagelisthead = package;
targetclient->packagelisttail = targetclient->packagelisthead;
} else {
targetclient->packagelisttail->tail = package;
targetclient->packagelisttail = targetclient->packagelisttail->tail;
}
if (!targetclient->canwrite) {
offset += packagesize;
continue;
}
struct CLIENTLIST *tmpclient;
for (tmpclient = writeclient ; tmpclient != NULL ; tmpclient = tmpclient->writetail) {
if (tmpclient == targetclient) {
break;
}
}
if (tmpclient == NULL) {
targetclient->writetail = writeclient;
writeclient = targetclient;
}
offset += packagesize;
}
writenode(writeclient);
return 0;
}
int parseconfigfile () {
#ifdef EXCEPTION_DEBUG
addTrace(__func__, sizeof(__func__));
#endif
int fd = open("config.json", O_RDONLY);
if (fd < 0) {
printf("open config.json fail, in %s, at %d\n", __FILE__, __LINE__);
return -1;
}
ssize_t len = read(fd, readbuf, MAXDATASIZE);
close(fd);
if (len < 0) {
printf("read config.json fail, in %s, at %d\n", __FILE__, __LINE__);
return -2;
}
readbuf[len] = '\0';
yyjson_doc *doc = yyjson_read(readbuf, len, YYJSON_READ_ALLOW_COMMENTS);
yyjson_val *root = yyjson_doc_get_root(doc);