-
Notifications
You must be signed in to change notification settings - Fork 7
/
tcp_server_interactive.c
109 lines (93 loc) · 2.48 KB
/
tcp_server_interactive.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define MAXLINE 80
#define SERVER_PORT 8000
#define TRUE 1
#define FALSE 0
void do_something_for_client(char *buf, int bytes)
{
int i;
for (i = 0; i < bytes; i++)
{
#ifdef DEBUG
printf("%c\t", buf[i]);
#endif
buf[i] = toupper(buf[i]);
}
fflush(stdout);
}
int main(int argc, char *argv[])
{
struct sockaddr_in server_addr, client_addr;
socklen_t client_addr_len;
int listen_fd, connect_fd;
char buf[MAXLINE];
char str[INET_ADDRSTRLEN];
int i, bytes;
int ret;
int optval = TRUE;
/*
* AF_INET for IPv4
* SOCK_STREAM for TCP
* protocol : 0
*/
listen_fd = Socket(AF_INET, SOCK_STREAM, 0);
/* set reuse address option */
if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0)
{
close(listen_fd);
return -1;
}
/* server address for bind */
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(SERVER_PORT);
/* bind fd and address (fixed address) */
ret = Bind(listen_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
if (ret < 0)
perror("Bind error\n");
/* listen fd */
Listen(listen_fd, 20);
printf("Accepting connecting...\n");
while (1)
{
client_addr_len = sizeof(client_addr);
connect_fd = Accept(listen_fd, (struct sockaddr *)&client_addr, &client_addr_len);
/* 处理每个连接的所有请求,直至客户端断开 */
while (1)
{
#ifdef USE_RW
/* recv client requst */
bytes = Read(connect_fd, buf, MAXLINE);
if (bytes == 0)
{
printf("the other side has been closed\n");
break;
}
printf("recv %d bytes from %s at port %d\n", bytes, inet_ntop(AF_INET, &client_addr.sin_addr, str, sizeof(str)), ntohs(client_addr.sin_port));
/* do something for client */
do_something_for_client(buf, bytes);
/* answer client request */
Write(connect_fd, buf, bytes);
#else
/* recv client requst */
struct sockaddr_in recv_addr;
socklen_t addrlen = sizeof(recv_addr);
bzero(&recv_addr, sizeof(recv_addr));
bytes = recvfrom(connect_fd, buf, MAXLINE, 0, (struct sockaddr*)&recv_addr, &addrlen);
/* do something for client */
do_something_for_client(buf, bytes);
/* answer client request */
bytes = sendto(connect_fd, buf, bytes, 0, (struct sockaddr*)&recv_addr, sizeof(recv_addr));
#endif
}
Close(connect_fd);
}
return 0;
}