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[C] C 实现 HTML5服务解析功能，遇到个socket客户端是否初次连接服务器的握手判断... [复制链接]

sasinop

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发表于 2015-04-09 13:38 |只看该作者 |倒序浏览

下面是服务器接受函数的代码：

如果是某个客户端第一次连接服务器，则建立握手先，以后，该连接除非重新连接服务器再，则不需要握手动作，做普通SOCKET通信

但是，下面代码作判断时，服务器只能与一个客户端建立连接，其他客户端就不能再连接上了，服务建立握手...

当多个客户端存在时，如何判断每一个客户端是否是第一次与服务器连接，以便建立握手？

// receive data
void RecvData(int fd, int events, void *arg)
{
unsigned char ret_len;
unsigned char send_str[254];
struct myevent_s *ev = (struct myevent_s*)arg;
int len,i;
memset(ev->buff,0,REQUEST_LEN_MAX);
len = recv(fd, ev->buff, sizeof(ev->buff), 0);
//printf("---------------------\n");
printf("recv data len: %d\n",len);
//printf("---------------------\n");
//printf("recv data content: %s\n",ev->buff);
printf("\n");
if(len<480){
//printf("recv data content:\n");
for(i=0;i<len;i++)
printf("%02x ",ev->buff[i]);
}
printf("\n");
if((0==connected))// [color=Red]目前只能接受一个客户端的连接握手，当第二个客户端请求连接时，就走不到握手协议这里，也就无法建立连接....[/color]
{
printf(" shakehand is ok %d \n",fd);
//printf("read:%d\n%s\n",len,ev->buff);
secWebSocketKey=computeAcceptKey(ev->buff);
shakeHand(fd,secWebSocketKey);
connected=1;
//printf("22222 connected is :%d \n",connected);
//continue;
}
/*
data=analyData(ev->buff,len);
printf("data conent: %s \n",ev->buff);
printf("data len: %d \n",len);
response(fd,data);
*/
if(len<254){
ret_len=analyData_2(ev->buff,len,send_str);
//printf("254 content:\n");
//for(i=0;i<ret_len;i++)
//printf("%02x ",send_str[i]);
}
if(len==6 & ev->buff[0]==0x88)//页面上断开连接
{
//printf("3333 connected is :%d \n",connected);
connected=0;
close(ev->fd);
printf("[fd=%d] pos[%d], closed gracefully.\n", fd, ev-g_Events);
//printf("4444 connected is :%d \n",connected);
}
if(len > 0)
{
ev->buff[0]=0x81;
ev->buff[1]=12;
ev->buff[2]=0x46;
ev->buff[3]=0x30;
ev->buff[4]=0x30;
ev->buff[5]=0x36;
ev->buff[6]=0x45;
ev->buff[7]=0x45;
ev->buff[8]=0x30;
ev->buff[9]=0x31;
ev->buff[10]=0x32;
ev->buff[11]=0x33;
ev->buff[12]=0x42;
ev->buff[13]=0x43;
ev->buff[14]=0x42;
ev->buff[15]=0x43;
ev->len += len;
printf("\n");
//ev->buff[0]=buffer[0];
//ev->buff[1]=buffer[1];
//memcpy(ev->buff,buffer,buffer[1]+2);
ev->len=14;
ev->call_back = SendData;
// change to send event
//EventSet(ev, fd, SendData, ev);
EventAdd(g_epollFd, EPOLLOUT, ev);
}
else if(len == 0)
{
close(ev->fd);
printf("[fd=%d] pos[%d], closed gracefully.\n", fd, ev-g_Events);
}
else
{
close(ev->fd);
printf("recv[fd=%d] error[%d]:%s\n", fd, errno, strerror(errno));
}
}

复制代码

相对全点的代码：

#define REQUEST_LEN_MAX 1024
#define DEFEULT_SERVER_PORT 8000
#define WEB_SOCKET_KEY_LEN_MAX 256
#define RESPONSE_HEADER_LEN_MAX 1024
#define LINE_MAX 256
#define HOST_IP_ADDRESS_TCP "192.168.34.52"
#define MAX_EVENTS 500
#define HOST_PORT_TCP 4530
int connected=0;//0:not connect.1:connected.
char *data;
char *secWebSocketKey;
void shakeHand(int connfd,const char *serverKey);
char * fetchSecKey(const char * buf);
char * computeAcceptKey(const char * buf);
char * analyData(const char * buf,const int bufLen);
char * packData(const char * message,unsigned long * len);
void response(const int connfd,const char * message);
unsigned char analyData_2( char * buf, int bufLen,char* payloadData );
struct myevent_s
{
int fd;
void (*call_back)(int fd, int events, void *arg);
int events;
void *arg;
int status; // 1: in epoll wait list, 0 not in
unsigned char buff[1024]; // recv data buffer
int len, s_offset;
long last_active; // last active time
};
// set event
void EventSet(struct myevent_s *ev, int fd, void (*call_back)(int, int, void*), void *arg)
{
ev->fd = fd;
ev->call_back = call_back;
ev->events = 0;
ev->arg = arg;
ev->status = 0;
bzero(ev->buff, sizeof(ev->buff));
ev->s_offset = 0;
ev->len = 0;
ev->last_active = time(NULL);
}
// add/mod an event to epoll
void EventAdd(int epollFd, int events, struct myevent_s *ev)
{
struct epoll_event epv = {0, {0}};
int op;
epv.data.ptr = ev;
epv.events = ev->events = events;
if(ev->status == 1){
op = EPOLL_CTL_MOD;
}
else{
op = EPOLL_CTL_ADD;
ev->status = 1;
}
if(epoll_ctl(epollFd, op, ev->fd, &epv) < 0)
printf("Event Add failed[fd=%d], evnets[%d]\n", ev->fd, events);
else
printf("Event Add OK[fd=%d], op=%d, evnets[%0X], status:[%d]\n", ev->fd, op, events, ev->status);
}
// delete an event from epoll
void EventDel(int epollFd, struct myevent_s *ev)
{
struct epoll_event epv = {0, {0}};
if(ev->status != 1) return;
epv.data.ptr = ev;
ev->status = 0;
epoll_ctl(epollFd, EPOLL_CTL_DEL, ev->fd, &epv);
}
int g_epollFd;
struct myevent_s g_Events[MAX_EVENTS+1]; // g_Events[MAX_EVENTS] is used by listen fd
void RecvData(int fd, int events, void *arg);
void SendData(int fd, int events, void *arg);
// accept new connections from clients
void AcceptConn(int fd, int events, void *arg)
{
struct sockaddr_in sin;
socklen_t len = sizeof(struct sockaddr_in);
int nfd, i;
// accept
if((nfd = accept(fd, (struct sockaddr*)&sin, &len)) == -1)
{
if(errno != EAGAIN && errno != EINTR)
{
}
printf("%s: accept, %d", __func__, errno);
return;
}
do
{
for(i = 0; i < MAX_EVENTS; i++)
{
if(g_Events[i].status == 0)
{
break;
}
}
if(i == MAX_EVENTS)
{
printf("%s:max connection limit[%d].", __func__, MAX_EVENTS);
break;
}
// set nonblocking
int iret = 0;
if((iret = fcntl(nfd, F_SETFL, O_NONBLOCK)) < 0)
{
printf("%s: fcntl nonblocking failed:%d", __func__, iret);
break;
}
// add a read event for receive data
EventSet(&g_Events[i], nfd, RecvData, &g_Events[i]);
EventAdd(g_epollFd, EPOLLIN, &g_Events[i]);
}while(0);
printf("new conn %s, %d,time:%ld, pos:%d \n", inet_ntoa(sin.sin_addr),
ntohs(sin.sin_port), g_Events[i].last_active, i);
}
// receive data
void RecvData(int fd, int events, void *arg)
{
unsigned char ret_len;
unsigned char send_str[254];
struct myevent_s *ev = (struct myevent_s*)arg;
int len,i;
memset(ev->buff,0,REQUEST_LEN_MAX);
len = recv(fd, ev->buff, sizeof(ev->buff), 0);
//printf("---------------------\n");
printf("recv data len: %d\n",len);
//printf("---------------------\n");
//printf("recv data content: %s\n",ev->buff);
printf("\n");
if(len<480){
//printf("recv data content:\n");
for(i=0;i<len;i++)
printf("%02x ",ev->buff[i]);
}
printf("\n");
if((0==connected))
{
printf(" shakehand is ok %d \n",fd);
//printf("read:%d\n%s\n",len,ev->buff);
secWebSocketKey=computeAcceptKey(ev->buff);
shakeHand(fd,secWebSocketKey);
connected=1;
//printf("22222 connected is :%d \n",connected);
//continue;
}
/*
data=analyData(ev->buff,len);
printf("data conent: %s \n",ev->buff);
printf("data len: %d \n",len);
response(fd,data);
*/
if(len<254){
ret_len=analyData_2(ev->buff,len,send_str);
//printf("254 content:\n");
//for(i=0;i<ret_len;i++)
//printf("%02x ",send_str[i]);
}
if(len==6 & ev->buff[0]==0x88)//页面上断开连接
{
//printf("3333 connected is :%d \n",connected);
connected=0;
close(ev->fd);
printf("[fd=%d] pos[%d], closed gracefully.\n", fd, ev-g_Events);
//printf("4444 connected is :%d \n",connected);
}
if(len > 0)
{
ev->buff[0]=0x81;
ev->buff[1]=12;
ev->buff[2]=0x46;
ev->buff[3]=0x30;
ev->buff[4]=0x30;
ev->buff[5]=0x36;
ev->buff[6]=0x45;
ev->buff[7]=0x45;
ev->buff[8]=0x30;
ev->buff[9]=0x31;
ev->buff[10]=0x32;
ev->buff[11]=0x33;
ev->buff[12]=0x42;
ev->buff[13]=0x43;
ev->buff[14]=0x42;
ev->buff[15]=0x43;
ev->len += len;
printf("\n");
//ev->buff[0]=buffer[0];
//ev->buff[1]=buffer[1];
//memcpy(ev->buff,buffer,buffer[1]+2);
ev->len=14;
ev->call_back = SendData;
// change to send event
//EventSet(ev, fd, SendData, ev);
EventAdd(g_epollFd, EPOLLOUT, ev);
}
else if(len == 0)
{
close(ev->fd);
printf("[fd=%d] pos[%d], closed gracefully.\n", fd, ev-g_Events);
}
else
{
close(ev->fd);
printf("recv[fd=%d] error[%d]:%s\n", fd, errno, strerror(errno));
}
}
// send data
void SendData(int fd, int events, void *arg)
{
struct myevent_s *ev = (struct myevent_s*)arg;
int len,i;
// send data
len = send(fd, ev->buff + ev->s_offset, ev->len - ev->s_offset, 0);
if(len > 0)
{
//printf("send[fd=%d], [%d<->%d]%s\n", fd, len, ev->len, ev->buff);
printf("send data is :\n");
for(i=0;i<ev->buff[1]+2;i++)
printf(" %02X", ev->buff[i]);
printf("\n");
ev->s_offset += len;
if(ev->s_offset == ev->len)
{
// change to receive event
EventDel(g_epollFd, ev);
EventSet(ev, fd, RecvData, ev);
EventAdd(g_epollFd, EPOLLIN, ev);
}
}
else
{
close(ev->fd);
EventDel(g_epollFd, ev);
printf("send[fd=%d] error[%d]\n", fd, errno);
}
}
void InitListenSocket(int epollFd, short port,char* ip)
{
int listenFd = socket(AF_INET, SOCK_STREAM, 0);
fcntl(listenFd, F_SETFL, O_NONBLOCK); // set non-blocking
printf("server listen fd=%d\n", listenFd);
EventSet(&g_Events[MAX_EVENTS], listenFd, AcceptConn, &g_Events[MAX_EVENTS]);
// add listen socket
EventAdd(epollFd, EPOLLIN, &g_Events[MAX_EVENTS]);
// bind & listen
struct sockaddr_in sin;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
//sin.sin_addr.s_addr = INADDR_ANY;
//sin.sin_addr.s_addr = inet_addr(HOST_IP_ADDRESS_TCP);
sin.sin_addr.s_addr = inet_addr(ip);
sin.sin_port = htons(port);
bind(listenFd, (struct sockaddr*)&sin, sizeof(sin));
listen(listenFd, 5);
printf("server ip is : %s \n",ip);
}
int main(int argc, char *argv[])
{
struct sockaddr_in servaddr, cliaddr;
socklen_t cliaddr_len;
int listenfd, connfd;
char buf[REQUEST_LEN_MAX];
char *data;
char str[INET_ADDRSTRLEN];
char *secWebSocketKey;
int i,n;
//int connected=0;//0:not connect.1:connected.
int port= DEFEULT_SERVER_PORT;
if(argc>1)
{
port=atoi(argv[1]);
}
if(port<=0||port>0xFFFF)
{
printf("Port(%d) is out of range(1-%d)\n",port,0xFFFF);
return;
}
// create epoll ///////////////////////
g_epollFd = epoll_create(MAX_EVENTS);
if(g_epollFd <= 0) printf("create epoll failed.%d\n", g_epollFd);
// create & bind listen socket, and add to epoll, set non-blocking
InitListenSocket(g_epollFd, HOST_PORT_TCP,HOST_IP_ADDRESS_TCP);
// event loop
struct epoll_event events[MAX_EVENTS];
printf("server running:port[%d]\n", HOST_PORT_TCP);
int checkPos = 0;
/////////////////////////////////
while (1)
{
// wait for events to happen
int fds = epoll_wait(g_epollFd, events, MAX_EVENTS, 1000);
if(fds < 0){
printf("epoll_wait error, exit\n");
break;
}
for( i = 0; i < fds; i++){
struct myevent_s *ev = (struct myevent_s*)events[i].data.ptr;
if((events[i].events&EPOLLIN)&&(ev->events&EPOLLIN)) // read event
{
ev->call_back(ev->fd, events[i].events, ev->arg);
}
if((events[i].events&EPOLLOUT)&&(ev->events&EPOLLOUT)) // write event
{
ev->call_back(ev->fd, events[i].events, ev->arg);
}
}
}//while
close(connfd);
}