1 //// 客户端上传文件 2 #include <stdio.h> 3 #include <string.h> 4 #include <unistd.h> 5 #include <arpa/inet.h> 6 #include <netinet/in.h> 7 #include <sys/types.h> 8 #include <sys/stat.h> 9 #include <fcntl.h> 10 int main(int argc, char const *argv[]) 11 { 12 // 1.创建套接字 13 int sockfd = socket(AF_INET, SOCK_DGRAM, 0); 14 if (sockfd < 0) 15 { 16 perror("socket"); 17 return -1; 18 } 19 // 2.打开待上传文件 20 int fd = open("a.txt", O_RDWR); 21 if (fd < 0) 22 { 23 perror("open"); 24 return -1; 25 } 26 // 3.指定服务器地址 27 struct sockaddr_in tftp_server_addr; 28 tftp_server_addr.sin_family = AF_INET; 29 tftp_server_addr.sin_port = htons(69); 30 tftp_server_addr.sin_addr.s_addr = inet_addr("10.9.42.228"); 31 // 4.组上传请求+发送请求 32 char buf[128] = ""; 33 int buflen = 0, readlen = 0; 34 buflen = sprintf(buf, "%c%c%s%c%s%c", 0, 2, "a.txt", 0, "netascii", 0); 35 sendto(sockfd, buf, buflen, 0, (struct sockaddr *)&tftp_server_addr, sizeof(tftp_server_addr)); 36 // 5.循环收取数据 37 char recvbuf[1024] = ""; 38 struct sockaddr_in tmp_server_addr; 39 socklen_t tmp_len = sizeof(tmp_server_addr); 40 unsigned short id = 0; 41 while (1) 42 { 43 // 5.1清空地址和数据内容 44 bzero(recvbuf, sizeof(recvbuf)); 45 bzero(&tmp_server_addr, tmp_len); 46 // 5.2收取数据recvfrom 47 buflen = recvfrom(sockfd, recvbuf, sizeof(recvbuf), 0, (struct sockaddr *)&tmp_server_addr, &tmp_len); 48 // 5.3判断 49 if (recvbuf[5] == 5) // recvbuf=05 00 50 { 51 // 如果是差错包--打印出错信息，break 52 printf("差错信息：%s\n", recvbuf + 4); 53 break; 54 } 55 else // recvbuf=04 00 56 { 57 recvbuf[1] = 3; 58 id = ntohs(*((unsigned short *)(recvbuf + 2))); 59 id += 1; 60 *((unsigned short *)(recvbuf + 2)) = htons(id); 61 readlen = read(fd, recvbuf + 4, 512); 62 printf("即将发送%d数据包, 数据包长度%d\n", id, readlen); 63 sendto(sockfd, recvbuf, readlen + 4, 0, (struct sockaddr *)&tmp_server_addr, &tmp_len); 64 // 如果读文件内容len<512,break 65 if (readlen < 512) 66 break; 67 } 68 } 69 // 6.关闭套接字 70 close(fd); 71 close(sockfd); 72 return 0; 73 }