diff --git a/day2/homework/client b/day2/homework/client new file mode 100755 index 0000000..f9ab7a5 Binary files /dev/null and b/day2/homework/client differ diff --git a/day2/homework/h2.c b/day2/homework/h2.c new file mode 100644 index 0000000..c4a6888 --- /dev/null +++ b/day2/homework/h2.c @@ -0,0 +1,70 @@ +// 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。 +#include +#include +#include +#include +#include +#include +#include // toupper + +int main(int argc, char const *argv[]) +{ + int sock_fd = socket(AF_INET, SOCK_DGRAM, 0); + if (sock_fd < 0) + { + perror("socket"); + return -1; + } + + struct sockaddr_in addr; + bzero(&addr, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(8000); + addr.sin_addr.s_addr = htonl(INADDR_ANY); + + if (bind(sock_fd, (struct sockaddr *)&addr, sizeof(addr)) != 0) + { + perror("bind"); + } + else + { + printf("bind success\n"); + + struct sockaddr_in src_addr; + char buf[128] = ""; // 接收数据的空间 + socklen_t socklen = sizeof(src_addr); + while (1) + { + 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 + ssize_t len = recvfrom(sock_fd, buf, sizeof(buf), 0, (struct sockaddr *)&src_addr, &socklen); + if (len < 0) + { + perror("recvfrom"); + break; + } + + char srcIP[INET_ADDRSTRLEN]; // 16 + int port = ntohs(src_addr.sin_port); // 将网络字节序转化为本地字节序 + 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 + + printf("从 %s:%d 位置接收到的数据(%lu Bytes): %s\n", srcIP, port, len, buf); + + int i = 0; + while (buf[i]) + { + buf[i] = toupper(buf[i]); // 转大写 + i++; + } + + sendto(sock_fd, buf, len, 0, (struct sockaddr *)&src_addr, socklen); + printf("发送回去的消息为 %s\n", buf); + } + } + + close(sock_fd); + + return 0; +} diff --git a/day2/homework/h3.c b/day2/homework/h3.c new file mode 100644 index 0000000..bc8666e --- /dev/null +++ b/day2/homework/h3.c @@ -0,0 +1,46 @@ +// 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。 +#include +#include +#include +#include +#include +#include + +int main(int argc, char const *argv[]) +{ + int sock_fd = socket(AF_INET, SOCK_DGRAM, 0); + if (sock_fd < 0) + { + perror("socket"); + return -1; + } + + struct sockaddr_in addr; + bzero(&addr, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(8000); + addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // 指定服务器地址 + + // 创建发送的数据 + char buf[128] = "this msg is from client"; + + // 发送 udp 数据 + 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 + if (n > 0) + { + perror("发送成功\n"); + } + + socklen_t addrlen = sizeof(addr); + + ssize_t recvlen = recvfrom(sock_fd, buf, 128, 0, (struct sockaddr *)&addr, &addrlen); // 从服务器获取数据到 buf + if (recvlen < 0) + { + perror("recvfrom"); + return 1; + } + + printf("从服务器获取的数据为 %s\n", buf); + + return 0; +} diff --git a/day2/homework/h4.c b/day2/homework/h4.c new file mode 100644 index 0000000..fd83756 --- /dev/null +++ b/day2/homework/h4.c @@ -0,0 +1,63 @@ +// 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 +#include +#include +#include +#include +#include +#include + +int main(int argc, char const *argv[]) +{ + int sock_fd = socket(AF_INET, SOCK_DGRAM, 0); + if (sock_fd < 0) + { + perror("socket"); + return -1; + } + + struct sockaddr_in addr; + bzero(&addr, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(8000); + addr.sin_addr.s_addr = htonl(INADDR_ANY); + + if (bind(sock_fd, (struct sockaddr *)&addr, sizeof(addr)) != 0) + { + perror("bind"); + } + else + { + printf("bind success\n"); + + struct sockaddr_in src_addr; + int n = 0; // 接收数的空间 + socklen_t socklen = sizeof(src_addr); + while (1) + { + bzero(&src_addr, sizeof(src_addr)); + + // 接收数据，如果数据未到达，则会阻塞，直到数据到达为止 + ssize_t len = recvfrom(sock_fd, &n, sizeof(n), 0, (struct sockaddr *)&src_addr, &socklen); + if (len < 0) + { + perror("recvfrom"); + break; + } + + char srcIP[INET_ADDRSTRLEN]; // 16 + int port = ntohs(src_addr.sin_port); // 将网络字节序转化为本地字节序 + 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 + + printf("从 %s:%d 位置接收到的数字为(%lu Bytes): %d\n", srcIP, port, len, n); + + int n_to_square = n * n; + + sendto(sock_fd, &n_to_square, len, 0, (struct sockaddr *)&src_addr, socklen); + printf("发送回去的平方值为 %d\n", n_to_square); + } + } + + close(sock_fd); + + return 0; +} diff --git a/day2/homework/h5.c b/day2/homework/h5.c new file mode 100644 index 0000000..8316164 --- /dev/null +++ b/day2/homework/h5.c @@ -0,0 +1,46 @@ +// 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。 +#include +#include +#include +#include +#include +#include + +int main(int argc, char const *argv[]) +{ + int sock_fd = socket(AF_INET, SOCK_DGRAM, 0); + if (sock_fd < 0) + { + perror("socket"); + return -1; + } + + struct sockaddr_in addr; + bzero(&addr, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(8000); + addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // 指定服务器地址 + + // 创建发送的数据 + int n = 5; + + // 发送 udp 数据 + 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 + if (sendnum > 0) + { + perror("发送成功\n"); + } + + socklen_t addrlen = sizeof(addr); + + ssize_t recvlen = recvfrom(sock_fd, &n, 128, 0, (struct sockaddr *)&addr, &addrlen); // 从服务器获取数据到 buf + if (recvlen < 0) + { + perror("recvfrom"); + return 1; + } + + printf("从服务器获取的平方值为 %d\n", n); + + return 0; +} diff --git a/day2/homework/server b/day2/homework/server new file mode 100755 index 0000000..71a7d8f Binary files /dev/null and b/day2/homework/server differ diff --git a/day4/webserver.c b/day4/webserver.c new file mode 100644 index 0000000..7e92e0a --- /dev/null +++ b/day4/webserver.c @@ -0,0 +1,219 @@ +// http网页服务器简单实现 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +char root_dir[] = "/home/flykhan/html"; + +char html_hi[] = "HTTP/1.1 200 OK\r\n" + "Server: MyWebServer1.0\r\n" + "Content-Type: text/html; charset=utf-8\r\n" + "Accept-Ranges: bytes\r\n" + "Connection: close\r\n" + "\r\n\r\n" + "

hi

\r\n" + "\r\n"; + +char html_404[] = "HTTP/1.1 404 Not Found\r\n" + "Server: MyWebServer1.0\r\n" + "Content-Type: text/html; charset=utf-8\r\n" + "Accept-Ranges: bytes\r\n" + "Connection: close\r\n" + "\r\n\r\n" + "

Page Not Found 404

\r\n" + "\r\n"; + +// 正常网页的 HEAD 头 +char html_ok[] = "HTTP/1.1 200 OK\r\n" + "Server: MyWebServer1.0\r\n" + "Content-Type: text/html; charset=utf-8\r\n" + "Accept-Ranges: bytes\r\n" + "Connection: close\r\n" + "\r\n\r\n"; + +// 正常网页的 图片 头 +char image_ok[] = "HTTP/1.1 200 OK\r\n" + "Server: MyWebServer1.0\r\n" + "Content-Type: image/png;\r\n" + "Accept-Ranges: bytes\r\n" + "Connection: keep-alive\r\n" + "Content-Length: %d\r\n" + "\r\n\r\n"; + +int sock_fd; // 全局定义 服务器 socket 套接字 + +// 自定义信号处理函数 +void signalHandler(int signal) +{ + printf("接收到信号 %d, 套接字为: %d\n", signal, sock_fd); + close(sock_fd); + // printf("套接字现在为 %d\n", sock_fd); +} + +// 定义结构体：用于描述连接的客户端信息 +typedef struct client_s +{ + unsigned char ip[INET_ADDRSTRLEN]; // 16 + int fd; +} Client; + +void *client_task(void *arg) +{ + Client *client = (Client *)arg; + + // 读取客户端的请求 + char buf[1024] = ""; // 存请求报文 + int len = recv(client->fd, buf, 1024, 0); // 接收数据 + printf("request data: %s\n", buf); + + // 解析请求（第一行和头属性以及BODY） + char *line1 = strtok(buf, "\r\n"); + printf("%s\n", line1); + + char method_path_[3][100]; + int i = 0; + char *token = strtok(line1, " "); + while (token != NULL) + { + strcpy(method_path_[i], token); + i++; + token = strtok(NULL, " "); + } + printf("path: %s\n", method_path_[1]); // 解析出地址路径 + + // 查找 html 目录中是否存在此文件 + if (strcmp(method_path_[1], "/") == 0) + { + strcpy(method_path_[1], "/index.html"); + } + + // 拼接服务器文件的完整访问路径 + char path[200] = ""; + strcat(path, root_dir); // 拼接根目录路径 + strcat(path, method_path_[1]); // 拼接请求路径 + + printf("filepath: %s\n", path); + int file_fd = open(path, O_RDONLY); + if (file_fd < 0) + { + // 文件不存在 + // 相应 404 + perror("open"); + send(client->fd, html_404, sizeof(html_404), 0); + } + else + { + // 读取文件的数据（验证读取文件的类型：文本文件、图片文件） + + // 向客户端发送 html_ok 头 + if (strstr(method_path_[1], ".png") != NULL || + strstr(method_path_[1], ".jpg") != NULL) + { + // 发图片头 + struct stat st; + stat(path, &st); + char _ok[sizeof(image_ok) + 20] = ""; + sprintf(_ok, image_ok, st.st_size); // 图片头拼接新获取的图片的大小 + send(client->fd, _ok, strlen(_ok), 0); + } + else + { + // 发文本头 + send(client->fd, html_ok, sizeof(html_ok), 0); + } + // 向客户端发送文件的数据（页面文件） + while (1) + { + char file_buf[512] = ""; + ssize_t read_len = read(file_fd, file_buf, 512); + write(client->fd, file_buf, read_len); + // send(client->fd, file_buf, read_len, 0); + + if (read_len < 512) + { + break; + } + } + close(file_fd); + } + + // 相应一个HELLO主页数据（HTML） + // send(client->fd, html_hi, sizeof(html_hi), 0); + + close(client->fd); + printf("%s 关闭连接\n", client->ip); + free(client); // 回收空间 +} + +int main(int argc, char const *argv[]) +{ + // 1. 创建 socket + sock_fd = socket(AF_INET, SOCK_STREAM, 0); + if (sock_fd < 0) + { + perror("socket"); + return 1; + } + + // 2. bind + struct sockaddr_in server_addr; + bzero(&server_addr, sizeof(server_addr)); + server_addr.sin_family = AF_INET; + server_addr.sin_port = htons(atoi(argv[1])); + server_addr.sin_addr.s_addr = htonl(INADDR_ANY); + + int flag = bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)); + if (flag != 0) + { + perror("bind"); + close(sock_fd); + return 1; + } + + // 注册信号处理函数 + signal(SIGINT, signalHandler); // ctrl + c 发送 + + // 3. 创建监听队列 + listen(sock_fd, 100); + + printf("-----WEB 服务器已开启端口号为:%s-----\n", argv[1]); + + // 4. 开始接收客户端的连接（并发接收多个客户端） + while (1) + { + struct sockaddr_in client_addr; + bzero(&client_addr, sizeof(client_addr)); + socklen_t client_addr_len = sizeof(client_addr); + + int client_fd = accept(sock_fd, (struct sockaddr *)&client_addr, &client_addr_len); + + char clinet_ip[INET_ADDRSTRLEN] = ""; + inet_ntop(AF_INET, &client_addr.sin_addr.s_addr, clinet_ip, INET_ADDRSTRLEN); + printf("%s 连接成功\n", clinet_ip); + + // 创建线程实现并发通信 + Client *client = malloc(sizeof(Client)); // 创建堆空间 + strcpy(client->ip, clinet_ip); + client->fd = client_fd; + + pthread_t tid; + pthread_create(&tid, NULL, client_task, client); + pthread_detach(tid); // 分离线程 + // pthread_join(tid,NULL); + } + + // 主进程的范畴 + close(sock_fd); + + return 0; +}