tftp文件接收客户端v1,v2

day3/tftpc.c

@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <arpa/tftp.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+/*
+* ./a.out server_ip 下载的文件名
+* ./tftpc server_ip filename
+*/
+
+int main(int argc, char const *argv[])
+{
+    if (argc < 3)
+    {
+        printf("usage: %s server_ip filename\n", argv[0]);
+        return 1;
+    }
+
+    int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (sock_fd < 0)
+    {
+        perror("socket");
+        return -1;
+    }
+
+    // 生成请求报文（数据包）
+    char request[64];
+    sprintf(request, "%c%c%s%c%s%c",
+            0, 1, argv[2], 0, "octet", 0);
+    // 发送请求
+    struct sockaddr_in server_addr;
+    bzero(&server_addr, sizeof(server_addr));
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(69); // TFTP 端口号
+    server_addr.sin_addr.s_addr = inet_addr(argv[1]);
+
+    size_t request_size = strlen(argv[2]) + 9;
+    sendto(sock_fd, request, request_size, 0, (struct sockaddr *)&server_addr, sizeof(server_addr));
+
+    // 创建本地文件的描述符（打开或创建文件）
+    int file_fd = open(argv[2], O_CREAT | O_WRONLY, 0666);
+
+    while (1)
+    {
+        char buf[516] = "";
+        struct sockaddr_in data_addr;
+        // bzero(&data_addr, sizeof(data_addr));
+        socklen_t data_addr_len = sizeof(data_addr);
+
+        ssize_t recv_len = recvfrom(sock_fd, buf, 516, 0, (struct sockaddr *)&data_addr, &data_addr_len);
+
+        // 判断接收的数据是否 OK
+        if (buf[1] == 3)
+        {
+                        printf("ok: %d -> %s\n", *(buf + 3), buf + 4);
+            // 收到的是数据包
+            write(file_fd, buf + 4, recv_len - 4);
+
+            // 回 ACK "Acknowledgment"（确认）
+            buf[1] = 4;
+            sendto(sock_fd, buf, 4, 0, (struct sockaddr *)&data_addr, data_addr_len);
+        }
+        else if (buf[1] == 5)
+        {
+            // 收到的是错误信息包
+            printf("error: %d -> %s\n", *(buf + 3), buf + 4);
+            execlp("rm", "rm", "-rf", argv[2], NULL);
+        }
+        else if (buf[1] == 6)
+        {
+            // 收到的是 OACK 包，包含请求选项回传的值
+        }
+
+        if (recv_len < 516)
+        {
+            printf("数据接收完成\n");
+            break; // 接到最后一组数据后不再接收
+        }
+    }
+
+    close(file_fd);
+    close(sock_fd);
+
+    return 0;
+}

day3/tftpc_2.c

@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/**
+ * ./a.out  server_ip  下载的文件名
+ * ./tftpc  server_ip  filename
+ */
+int main(int argc, char const *argv[])
+{
+    if (argc < 3)
+    {
+        printf("format:  %s server_ip filename\n", argv[0]);
+        return -1;
+    }
+
+    int sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (sock_fd < 0)
+    {
+        perror("socket");
+        return -1;
+    }
+    // 生成请求数据包
+    char request[64];
+    int request_size = sprintf(request, "%c%c%s%c%s%c", 0, 1, argv[2], 0, "octet", 0);
+
+    // 发送请求
+    struct sockaddr_in server_addr;
+    bzero(&server_addr, sizeof(server_addr));
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(69);
+    server_addr.sin_addr.s_addr = inet_addr(argv[1]);
+
+    sendto(sock_fd, request, request_size, 0, (struct sockaddr *)&server_addr, sizeof(server_addr));
+
+    char buf[516] = "";
+    struct sockaddr_in data_addr;
+    socklen_t data_addr_len = sizeof(data_addr);
+    bzero(&data_addr, data_addr_len);
+    ssize_t len = recvfrom(sock_fd, buf, 516, 0, (struct sockaddr *)&data_addr, &data_addr_len);
+
+    // 验证接收的数据是否OK
+    if (buf[1] == 3)
+    {
+        // 创建本地文件的描述符（打开或创建文件）
+        int fd = open(argv[2], O_CREAT | O_WRONLY, 0666);
+
+        while (1)
+        {
+            // 收到的是数据包
+            write(fd, buf + 4, len - 4);
+            // 回ACK
+            buf[1] = 4;
+            sendto(sock_fd, buf, 4, 0, (struct sockaddr *)&data_addr, sizeof(data_addr));
+            if (len < 516)
+            {
+                printf("数据接收完成\n");
+                break;
+            }
+
+            bzero(&data_addr, data_addr_len);
+            bzero(buf, sizeof(buf));
+            len = recvfrom(sock_fd, buf, 516, 0, (struct sockaddr *)&data_addr, &data_addr_len);
+        }
+
+        close(fd);
+    }
+    else if (buf[1] == 5)
+    {
+        // 收到的错误信息包
+        printf("error: %s\n", buf + 4);
+    }
+    else if (buf[1] == 6)
+    {
+        // 收到的OACK包，包含请求选项回传的值
+    }
+
+    close(sock_fd);
+    return 0;
+}