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qfedu-network-advanced-level
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第2天上课

This commit is contained in:
flykhan 2023-09-05 20:54:17 +08:00
commit 6d6d3a393d
10 changed files with 438 additions and 0 deletions
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23
day2/n1.c Normal file
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#include <stdio.h>
union
{
unsigned short num;
unsigned char c[2];
} data;
int main(int argc, char const *argv[])
{
data.num = 0x0102;
if (data.c[0] == 1)
{
printf("大端字节序\n");
}
else
{
printf("小端字节序\n");
}
return 0;
}

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day2/n2.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
int main(int argc, char const *argv[])
{
unsigned int data=0x01020304;
// 转成网络端数据（小端转大端）
u_int32_t data2 = htonl(data);
printf("主机字节序: %#x\n",data);
printf("网络字节序: %#x\n",data2);
return 0;
}

17
day2/n3.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
int main(int argc, char const *argv[])
{
unsigned int data = 0x01020304;
// 转成网络端数据（小端转大端）
uint32_t data2 = htonl(data);
printf("主机字节序: %#08x\n", data);
printf("网络字节序: %#x\n", data2);
// 将网络字节序转为主机字节序
uint32_t data3 = ntohl(data2);
printf("转换后主机字节序: %#x\n", data);
return 0;
}

22
day2/n4.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
int main(int argc, char const *argv[])
{
char *ip = "10.35.188.66";
// ip 地址转换为四字节
uint32_t ip_data;
// 将 ip 转换为数值
int ret = inet_pton(AF_INET, ip, &ip_data);
printf("ip转换数值的结果(%d): %#x\n", ret, ip_data);
// 将 ip 的数值转换为 ipv6 字符串
char ip_dst[25] = "";
if (inet_ntop(AF_INET6, &ip_data, ip_dst, INET6_ADDRSTRLEN) != NULL)
{
printf("由数值转化为 ip 地址的字符串: %s\n", ip_dst);
}
return 0;
}

20
day2/n5.c Normal file
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#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
int main(int argc, char const *argv[])
{
// 创建socket
int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (socket_fd < 0)
{
perror("socket");
return 1;
}
printf("socket 创建成功: %d\n", socket_fd);
close(socket_fd);
return 0;
}

42
day2/n6_send.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h> // 地址结构
#include <unistd.h>
#include <string.h>
int main(int argc, char const *argv[])
{
// 1. 创建套接字
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sfd < 0)
{
perror("socket");
return -1;
}
// 2. 创建发送目标的ip地址和端口号
struct sockaddr_in addr;
bzero(&addr, sizeof(addr)); // 初始化置零
addr.sin_family = AF_INET;
addr.sin_port = htons(8000);
inet_pton(AF_INET, "10.35.188.66", &addr.sin_addr.s_addr);
// 3. 创建发送的数据
char *buf = "hi, udp server: disen hh";
// 4. 发送一次 udp 数据
ssize_t n = sendto(sfd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr));
if (n > 0)
{
printf("发送 udp 数据成功\n");
}else{
printf("发送失败\n");
perror("sendto");
}
// 5. 关闭 socket
close(sfd);
return 0;
}

55
day2/n6_send_2.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h> // 地址结构
#include <unistd.h>
#include <string.h>
int main(int argc, char const *argv[])
{
// 1. 创建套接字
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sfd < 0)
{
perror("socket");
return -1;
}
// 2. 创建发送目标的ip地址和端口号
struct sockaddr_in addr;
bzero(&addr, sizeof(addr)); // 初始化置零
addr.sin_family = AF_INET;
addr.sin_port = htons(8000);
inet_pton(AF_INET, "192.168.31.1", &addr.sin_addr.s_addr);
int n = 1;
// 3. 创建发送的数据
while (1)
{
char buf[128] = "";
scanf("%s", buf);
if (strncmp(buf, "exit", 4) == 0)
{
break;
}
// sprintf(buf, "this is : %lld\n", (n++ * ++n));
// 4. 发送一次 udp 数据
ssize_t n = sendto(sfd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr));
if (n > 0)
{
printf("%s: 发送 udp 数据成功\n", buf);
}
else
{
printf("%s: 发送失败\n", buf);
perror("sendto");
}
}
// 5. 关闭 socket
close(sfd);
return 0;
}

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#include <stdio.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
int main(int argc, char const *argv[])
{
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sfd < 0)
{
perror("socket");
return -1;
}
// 1. 绑定本地 ip 和端口号
struct sockaddr_in addr; // sockaddr_in 结构体对象
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(8000); // 当前 Linux 进程的端口号
addr.sin_addr.s_addr = htonl(INADDR_ANY); // INADDR_ANY 任意连接的 ip 可用
// inet_pton(AF_INET, "192.168.31.128", &addr.sin_addr.s_addr);
if (bind(sfd, (struct sockaddr *)&addr, sizeof(addr)) != 0) // 绑定
{
perror("bind");
}
else
{
printf("bind success\n");
// 接收数据
char buf[128] = ""; // 接收数据的空间
struct sockaddr_in src_addr; // 数据来源的地址
socklen_t addr_len;
while (1)
{
// 重置数据
bzero(&src_addr, sizeof(src_addr));
bzero(buf, 128);
// 接收数据，如果数据未到达，则会阻塞，直到数据到达为止
socklen_t addr_len = sizeof(src_addr);
ssize_t len = recvfrom(sfd, buf, 128, 0, (struct sockaddr *)&src_addr, &addr_len);
if (len < 0)
{
perror("recvfrom");
break;
}
char src_ip[16];
int src_port = ntohs(src_addr.sin_port); // 将网络字节序转化为主机字节序
inet_ntop(AF_INET, &src_addr.sin_addr.s_addr, src_ip, 16); // 从 src_addr 取 ip 并转化为字符串赋值给 src_ip
printf("从 %s:%d 位置接受到的数据(%ld Bytes): %s\n", src_ip, src_port, len, buf);
char buf2[1280];
sprintf(buf2, "返回: %s\n", buf);
// 回一句消息
sendto(sfd, buf2, strlen(buf2), 0, (struct sockaddr *)&src_addr, addr_len);
}
}
close(sfd);
return 0;
}

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day2/qq/qq.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <stdlib.h> // atoi
void *recv_task(void *arg); // 接收数据的线程任务函数
void *send_task(void *arg); // 发送数据的线程任务函数
int main(int argc, char const *argv[])
{
if (argc != 2)
{
printf("usage: %s port\n", argv[0]);
return 1;
}
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sfd < 0)
{
perror("socket");
return -1;
}
// 绑定 ip 和端口号 (开启 UDP 服务)
struct sockaddr_in bind_addr;
bzero(&bind_addr, sizeof(bind_addr));
bind_addr.sin_family = AF_INET;
bind_addr.sin_port = htons(atoi(argv[1]));
bind_addr.sin_addr.s_addr = htonl(INADDR_ANY); // 主机 ip 中的任意一个都可以使用
if (bind(sfd, (struct sockaddr *)&bind_addr, sizeof(bind_addr)) != 0)
{
perror("bind");
close(sfd);
return -1;
}
pthread_t t1, t2;
pthread_create(&t1, NULL, recv_task, (void *)&sfd);
pthread_create(&t2, NULL, send_task, &sfd);
pthread_join(t2, NULL);
pthread_cancel(t1); // 发完后，取消接收
pthread_join(t1, NULL); // 等待接收线程结束
close(sfd);
return 0;
}
void *recv_task(void *arg)
{
int sock_fd = *((int *)arg); // 取出传入的 socket 描述符
printf("启动recv_task %d\n", sock_fd);
char buf[128] = "";
struct sockaddr_in src_addr; // 发送数据的源地址
socklen_t sock_len; // 原地址 socket 的长度
while (1)
{
bzero(buf, sizeof(buf));
bzero(&src_addr, sizeof(src_addr));
ssize_t len = recvfrom(sock_fd, buf, sizeof(buf), 0, (struct sockaddr *)&src_addr, &sock_len);
if (len < 0)
{
perror("recvfrom");
}
char ip[INET_ADDRSTRLEN] = "";
int port = ntohs(src_addr.sin_port);
inet_ntop(AF_INET, &src_addr.sin_addr.s_addr, ip, INET_ADDRSTRLEN);
printf("%s:%d 说: %s\n", ip, port, buf);
}
}
void *send_task(void *arg)
{
int sock_fd = *((int *)arg);
// @192.168.1.2:8000
// hi,hello
// good,disen
// haha
// yes
// @:8500
// very,good
char ip[INET_ADDRSTRLEN] = "";
int port = 0;
struct sockaddr_in dst_addr; // 目标地址
while (1)
{
char buf[128] = "";
fgets(buf, sizeof(buf), stdin);
buf[strlen(buf) - 1] = 0; // 去掉最后的换行
if (buf[0] == '@')
{
if (buf[1] == ':')
{
strcpy(ip, "127.0.0.1");
port = atoi(buf + 2);
}
else
{
strcpy(ip, strtok(buf + 1, ":"));
port = atoi(strtok(NULL, ":"));
}
printf("ip:port is %s:%d\n",ip,port);
// 重置
bzero(&dst_addr, sizeof(dst_addr));
dst_addr.sin_family = AF_INET;
dst_addr.sin_port = htons(port);
// inet_pton(AF_INET, ip, &dst_addr.sin_addr.s_addr); // 按ipv4转地址
dst_addr.sin_addr.s_addr = inet_addr(ip);
// inet_pton(sock_fd, ip, &dst_addr.sin_addr.s_addr); // bug地方
}
else
{
if (strncmp(buf, "exit", 4) == 0)
{
break;
}
if (port == 0)
{
printf("请先确认发送的目的ip和端口号\n");
continue;
}
// 发送数据
if (sendto(sock_fd, buf, strlen(buf), 0, (struct sockaddr *)&dst_addr, sizeof(dst_addr)) < 0)
{
perror("sendto");
}
}
}
}

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day2/test2.c Normal file
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#include <stdio.h>
#include <arpa/inet.h>
int main(int argc, char const *argv[])
{
unsigned int data = 0x01020304;
printf("主机字节序: ");
for (int i = 0; i < sizeof(unsigned int); i++) {
unsigned char byte = (data >> (i * 8)) & 0xFF;
printf("%02x", byte);
}
printf("\n");
// 转成网络字节序（小端转大端）
uint32_t data2 = htonl(data);
printf("网络字节序: ");
for (int i = 0; i < sizeof(uint32_t); i++) {
unsigned char byte = (data2 >> (i * 8)) & 0xFF;
printf("%02x", byte);
}
printf("\n");
// 将网络字节序转为主机字节序
uint32_t data3 = ntohl(data2);
printf("转换后主机字节序: ");
for (int i = 0; i < sizeof(uint32_t); i++) {
unsigned char byte = (data3 >> (i * 8)) & 0xFF;
printf("%02x", byte);
}
printf("\n");
return 0;
}