好的,所以我有一台服务器&客户端使用套接字和线程。
服务器:
<Includes>...
struct sockaddr_in server;
int sock,rvsock;
int port,max,k = 0, len;
char buff[1024];
pthread_t thr[100];
void handler(int sig)
{
if(close(rvsock) < 0)
{
perror("Close.");
return;
}
}
void *worker (void* a)
{
k=0;
int ar[3];
int i=0;
char Smax[1024];
char *token;
recv(sock,&buff,sizeof(buff),0);
token = strtok(buff," ");
while(token && token!=" ")
{
int nr = atoi(token);
ar[i]=nr;
k=k+nr;
i++;
token = strtok(NULL," ");
}
if (k > max)
{
printf ("%d is indeed > than %d\n",k,max);
max=k;
}
printf("Current max is %d\n",max);
char temp[1024];
sprintf(temp,"%d",max);
strcpy(Smax,"The current maximum is: ");
strcat(Smax,temp);
strcat(Smax," and the numbers are: ");
for (i=0;i<3;i++)
{
sprintf(temp,"%d",ar[i]);
strcat(Smax,temp);
strcat(Smax," ");
}
printf ("%s\n",Smax);
send(sock, &Smax, sizeof(Smax), 0);
close(sock);
}
int main (int argc,char* argv[])
{
int i=0;
if (argc < 2)
{
perror ("No port assigned.");
exit(0);
}
else
{
sscanf (argv[1],"%d",&port);
}
/* Creating socket (AF_INET - TCP/IP) */
rvsock = socket (AF_INET,SOCK_STREAM,0);
if (rvsock<0)
{
perror("Socket was not created.");
}
memset(&server,0,sizeof(server));
server.sin_family=AF_INET;
server.sin_addr.s_addr=INADDR_ANY;
server.sin_port=htons(port);
/* Binding socket */
if( bind(rvsock,(struct sockaddr*)&server,sizeof(server))<0)
perror("Error in binding socket");
else
{
printf("Server established.\nAwaying clients.\n");
}
/* Listening */
if (listen(rvsock,5)<0)
perror("Error in listening");
len = sizeof(server);
signal(SIGINT,handler);
/* Accepting and threading */
while(1 && i<100){
sock = accept (rvsock,(struct sockaddr*)&server,(socklen_t * __restrict__) &len);
if (sock<0)
{
perror("Error in accepting socket");
break;
}
pthread_create(&thr,NULL,worker,i);
i++;
}
int j;
/* Joining threads */
for (j=0;j<100;j++)
pthread_join(thr,NULL);
return 0;
客户机侧:
int main(int argc,char* argv[])
{
int sock;
int k,port;
char len[1024];
char buff[1024];
struct sockaddr_in server;
if (argc<2)
{
perror ("Invalid number of args");
exit(0);
}
else
{
sscanf(argv[1],"%d",&port);
randomize(buff);
}
sock = socket(AF_INET,SOCK_STREAM,0);
if(sock<0)
perror("Socket creation failure");
memset(&server,0,sizeof(server));
server.sin_family=AF_INET;
server.sin_addr.s_addr=inet_addr("127.0.0.1");
server.sin_port=htons(port);
if (connect(sock,(struct sockaddr*)&server,sizeof(server))<0)
perror("Connection error");
printf("Sending input: %s\n",buff);
send(sock,buff,sizeof(buff),0);
while(1)
{
k = recv(sock,&len, sizeof(len),0);
if(k<=0)
break;
printf("Got back %s \n",len);
}
close(sock);
return 0;
服务器具有将数据发送回客户端的工作函数。我需要在该数据中包含客户端的IP和端口。
我怎么能得到它?
答案 0 :(得分:2)
在您的代码中:
sock = accept (rvsock,(struct sockaddr*)&server,(socklen_t * __restrict__) &len);
您正在使用客户端信息覆盖server
的内容。 len
也会被server
中覆盖的内容覆盖。你需要做这样的事情来接收客户端套接字信息(取自Beej's networking guide):
struct sockaddr_storage their_addr;
socklen_t addr_size;
struct addrinfo hints, *res;
int sockfd, new_fd;
// first, load up address structs with getaddrinfo():
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC; // use IPv4 or IPv6, whichever
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; // fill in my IP for me
getaddrinfo(NULL, MYPORT, &hints, &res);
// make a socket, bind it, and listen on it:
sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
bind(sockfd, res->ai_addr, res->ai_addrlen);
listen(sockfd, BACKLOG);
// now accept an incoming connection:
addr_size = sizeof their_addr;
new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &addr_size);
// ready to communicate on socket descriptor new_fd!
来自man 2 accept
的段落:
参数地址是一个用。填充的结果参数 通信层已知的连接实体的地址。 地址参数的确切格式由域中的确定 沟通正在发生。 address_len是一个值结果 参数;它应该最初包含指向的空间量 地址;返回时它将包含的实际长度(以字节为单位) 地址已退回。此调用与基于连接的套接字类型一起使用, 目前使用SOCK_STREAM。