添加ctrlc的信号处理,用于关闭套接字
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// 编写一个UDP服务器程序,接收客户端发送的字符串,并将其转换为大写后发送回客户端。
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#include <stdio.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <ctype.h> // toupper
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int main(int argc, char const *argv[])
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{
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int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock_fd < 0)
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{
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perror("socket");
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return -1;
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}
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(8000);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(sock_fd, (struct sockaddr *)&addr, sizeof(addr)) != 0)
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{
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perror("bind");
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}
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else
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{
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printf("bind success\n");
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struct sockaddr_in src_addr;
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char buf[128] = ""; // 接收数据的空间
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socklen_t socklen = sizeof(src_addr);
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while (1)
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{
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bzero(&src_addr, sizeof(src_addr));
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bzero(buf, 128);
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// 接收数据,如果数据未到达,则会阻塞,直到数据到达为止
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ssize_t len = recvfrom(sock_fd, buf, sizeof(buf), 0, (struct sockaddr *)&src_addr, &socklen);
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if (len < 0)
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{
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perror("recvfrom");
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break;
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}
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char srcIP[INET_ADDRSTRLEN]; // 16
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int port = ntohs(src_addr.sin_port); // 将网络字节序转化为本地字节序
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inet_ntop(AF_INET, &src_addr.sin_addr.s_addr, srcIP, INET_ADDRSTRLEN); // 将网络数字转换为点分十进制 ip
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printf("从 %s:%d 位置接收到的数据(%lu Bytes): %s\n", srcIP, port, len, buf);
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int i = 0;
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while (buf[i])
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{
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buf[i] = toupper(buf[i]); // 转大写
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i++;
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}
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sendto(sock_fd, buf, len, 0, (struct sockaddr *)&src_addr, socklen);
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printf("发送回去的消息为 %s\n", buf);
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}
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}
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close(sock_fd);
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return 0;
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}
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// 编写一个UDP客户端程序, 向服务器发送一个字符串, 并接收服务器返回的字符串并打印出来。
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#include <stdio.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <string.h>
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int main(int argc, char const *argv[])
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{
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int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock_fd < 0)
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{
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perror("socket");
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return -1;
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}
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(8000);
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addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // 指定服务器地址
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// 创建发送的数据
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char buf[128] = "this msg is from client";
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// 发送 udp 数据
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ssize_t n = sendto(sock_fd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr)); // 将 buf 数据发送给服务器
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if (n > 0)
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{
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perror("发送成功\n");
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}
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socklen_t addrlen = sizeof(addr);
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ssize_t recvlen = recvfrom(sock_fd, buf, 128, 0, (struct sockaddr *)&addr, &addrlen); // 从服务器获取数据到 buf
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if (recvlen < 0)
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{
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perror("recvfrom");
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return 1;
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}
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printf("从服务器获取的数据为 %s\n", buf);
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return 0;
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}
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// 编写一个UDP服务器程序, 接收客户端发送的整数, 计算其平方并发送回客户端
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#include <stdio.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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int main(int argc, char const *argv[])
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{
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int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock_fd < 0)
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{
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perror("socket");
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return -1;
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}
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(8000);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(sock_fd, (struct sockaddr *)&addr, sizeof(addr)) != 0)
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{
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perror("bind");
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}
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else
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{
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printf("bind success\n");
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struct sockaddr_in src_addr;
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int n = 0; // 接收数的空间
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socklen_t socklen = sizeof(src_addr);
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while (1)
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{
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bzero(&src_addr, sizeof(src_addr));
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// 接收数据,如果数据未到达,则会阻塞,直到数据到达为止
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ssize_t len = recvfrom(sock_fd, &n, sizeof(n), 0, (struct sockaddr *)&src_addr, &socklen);
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if (len < 0)
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{
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perror("recvfrom");
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break;
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}
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char srcIP[INET_ADDRSTRLEN]; // 16
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int port = ntohs(src_addr.sin_port); // 将网络字节序转化为本地字节序
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inet_ntop(AF_INET, &src_addr.sin_addr.s_addr, srcIP, INET_ADDRSTRLEN); // 将网络数字转换为点分十进制 ip
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printf("从 %s:%d 位置接收到的数字为(%lu Bytes): %d\n", srcIP, port, len, n);
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int n_to_square = n * n;
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sendto(sock_fd, &n_to_square, len, 0, (struct sockaddr *)&src_addr, socklen);
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printf("发送回去的平方值为 %d\n", n_to_square);
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}
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}
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close(sock_fd);
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return 0;
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}
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// 编写一个UDP客户端程序, 向服务器发送一个整数, 接收服务器返回的整数并打印出来。
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#include <stdio.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <string.h>
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int main(int argc, char const *argv[])
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{
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int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock_fd < 0)
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{
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perror("socket");
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return -1;
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}
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(8000);
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addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // 指定服务器地址
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// 创建发送的数据
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int n = 5;
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// 发送 udp 数据
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ssize_t sendnum = sendto(sock_fd, &n, sizeof(n), 0, (struct sockaddr *)&addr, sizeof(addr)); // 将 buf 数据发送给服务器
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if (sendnum > 0)
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{
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perror("发送成功\n");
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}
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socklen_t addrlen = sizeof(addr);
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ssize_t recvlen = recvfrom(sock_fd, &n, 128, 0, (struct sockaddr *)&addr, &addrlen); // 从服务器获取数据到 buf
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if (recvlen < 0)
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{
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perror("recvfrom");
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return 1;
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}
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printf("从服务器获取的平方值为 %d\n", n);
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return 0;
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}
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// http网页服务器简单实现
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <pthread.h>
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#include <signal.h>
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char root_dir[] = "/home/flykhan/html";
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char html_hi[] = "HTTP/1.1 200 OK\r\n"
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"Server: MyWebServer1.0\r\n"
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"Content-Type: text/html; charset=utf-8\r\n"
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"Accept-Ranges: bytes\r\n"
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"Connection: close\r\n"
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"\r\n\r\n"
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"<h3 style=\"color:blue\">hi</h3>\r\n"
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"\r\n";
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char html_404[] = "HTTP/1.1 404 Not Found\r\n"
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"Server: MyWebServer1.0\r\n"
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"Content-Type: text/html; charset=utf-8\r\n"
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"Accept-Ranges: bytes\r\n"
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"Connection: close\r\n"
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"\r\n\r\n"
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"<h3 style=\"color:red\">Page Not Found 404</h3>\r\n"
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"\r\n";
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// 正常网页的 HEAD 头
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char html_ok[] = "HTTP/1.1 200 OK\r\n"
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"Server: MyWebServer1.0\r\n"
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"Content-Type: text/html; charset=utf-8\r\n"
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"Accept-Ranges: bytes\r\n"
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"Connection: close\r\n"
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"\r\n\r\n";
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// 正常网页的 图片 头
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char image_ok[] = "HTTP/1.1 200 OK\r\n"
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"Server: MyWebServer1.0\r\n"
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"Content-Type: image/png;\r\n"
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"Accept-Ranges: bytes\r\n"
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"Connection: keep-alive\r\n"
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"Content-Length: %d\r\n"
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"\r\n\r\n";
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int sock_fd; // 全局定义 服务器 socket 套接字
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// 自定义信号处理函数
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void signalHandler(int signal)
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{
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printf("接收到信号 %d, 套接字为: %d\n", signal, sock_fd);
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close(sock_fd);
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// printf("套接字现在为 %d\n", sock_fd);
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}
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// 定义结构体:用于描述连接的客户端信息
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typedef struct client_s
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{
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unsigned char ip[INET_ADDRSTRLEN]; // 16
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int fd;
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} Client;
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void *client_task(void *arg)
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{
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Client *client = (Client *)arg;
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// 读取客户端的请求
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char buf[1024] = ""; // 存请求报文
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int len = recv(client->fd, buf, 1024, 0); // 接收数据
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printf("request data: %s\n", buf);
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// 解析请求(第一行和头属性以及BODY)
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char *line1 = strtok(buf, "\r\n");
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printf("%s\n", line1);
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char method_path_[3][100];
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int i = 0;
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char *token = strtok(line1, " ");
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while (token != NULL)
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{
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strcpy(method_path_[i], token);
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i++;
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token = strtok(NULL, " ");
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}
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printf("path: %s\n", method_path_[1]); // 解析出地址路径
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// 查找 html 目录中是否存在此文件
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if (strcmp(method_path_[1], "/") == 0)
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{
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strcpy(method_path_[1], "/index.html");
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}
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// 拼接服务器文件的完整访问路径
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char path[200] = "";
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strcat(path, root_dir); // 拼接根目录路径
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strcat(path, method_path_[1]); // 拼接请求路径
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printf("filepath: %s\n", path);
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int file_fd = open(path, O_RDONLY);
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if (file_fd < 0)
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{
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// 文件不存在
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// 相应 404
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perror("open");
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send(client->fd, html_404, sizeof(html_404), 0);
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}
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else
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{
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// 读取文件的数据(验证读取文件的类型:文本文件、图片文件)
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// 向客户端发送 html_ok 头
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if (strstr(method_path_[1], ".png") != NULL ||
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strstr(method_path_[1], ".jpg") != NULL)
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{
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// 发图片头
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struct stat st;
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stat(path, &st);
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char _ok[sizeof(image_ok) + 20] = "";
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sprintf(_ok, image_ok, st.st_size); // 图片头拼接新获取的图片的大小
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send(client->fd, _ok, strlen(_ok), 0);
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}
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else
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{
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// 发文本头
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send(client->fd, html_ok, sizeof(html_ok), 0);
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}
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// 向客户端发送文件的数据(页面文件)
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while (1)
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{
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char file_buf[512] = "";
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ssize_t read_len = read(file_fd, file_buf, 512);
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write(client->fd, file_buf, read_len);
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// send(client->fd, file_buf, read_len, 0);
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if (read_len < 512)
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{
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break;
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}
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}
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close(file_fd);
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}
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// 相应一个HELLO主页数据(HTML)
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// send(client->fd, html_hi, sizeof(html_hi), 0);
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close(client->fd);
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printf("%s 关闭连接\n", client->ip);
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free(client); // 回收空间
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}
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int main(int argc, char const *argv[])
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{
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// 1. 创建 socket
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sock_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (sock_fd < 0)
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{
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perror("socket");
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return 1;
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}
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// 2. bind
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struct sockaddr_in server_addr;
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bzero(&server_addr, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(atoi(argv[1]));
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server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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int flag = bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
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if (flag != 0)
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{
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perror("bind");
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close(sock_fd);
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return 1;
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}
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// 注册信号处理函数
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signal(SIGINT, signalHandler); // ctrl + c 发送
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// 3. 创建监听队列
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listen(sock_fd, 100);
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printf("-----WEB 服务器已开启端口号为:%s-----\n", argv[1]);
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// 4. 开始接收客户端的连接(并发接收多个客户端)
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while (1)
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{
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struct sockaddr_in client_addr;
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bzero(&client_addr, sizeof(client_addr));
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socklen_t client_addr_len = sizeof(client_addr);
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int client_fd = accept(sock_fd, (struct sockaddr *)&client_addr, &client_addr_len);
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char clinet_ip[INET_ADDRSTRLEN] = "";
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inet_ntop(AF_INET, &client_addr.sin_addr.s_addr, clinet_ip, INET_ADDRSTRLEN);
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printf("%s 连接成功\n", clinet_ip);
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// 创建线程实现并发通信
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Client *client = malloc(sizeof(Client)); // 创建堆空间
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strcpy(client->ip, clinet_ip);
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client->fd = client_fd;
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pthread_t tid;
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pthread_create(&tid, NULL, client_task, client);
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pthread_detach(tid); // 分离线程
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// pthread_join(tid,NULL);
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}
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// 主进程的范畴
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close(sock_fd);
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return 0;
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}
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