[英]tftp client not receiving from server (send to wrong port)
我正在编写自己的TFTP客户端。 客户端是用c ++编写的(部分为c),并在unix系统(Linux Debian稳定版)上运行。
这是我的问题:
我可以将读取请求(RRQ)发送到TFTP服务器(在Windows XP上为Open TFTP Server)。 TFTP服务器收到RRQ,但无法发送答案。
在服务器端,我看到以下消息:客户端192.168.1.110:55239 C:\\ OpenTFTPServer \\ test.txt,通信错误
但是端口55239不是我在TFTP客户端中定义的端口。
这是我的代码部分:
设置客户端和服务器地址:
memset(&servaddr,0,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(servport); // servport=69 servaddr.sin_addr.s_addr = inet_addr("192.168.1.152"); memset(&cliaddr,0,sizeof(cliaddr)); cliaddr.sin_family = AF_INET; cliaddr.sin_port = htons(cliport); // cliport=13337 cliaddr.sin_addr.s_addr = inet_addr("192.168.1.110");
连接并绑定:
if (connect(serv, (struct sockaddr *) &servaddr, serv_length) < 0) { bail("Unable to connect with the server!"); } if(bind(cli, (struct sockaddr *)&cliaddr, cli_length)<0) { bail("Unable to bind to adr & port!"); }
创建TFTP请求:
memset( &cBuf1, 0, sizeof cBuf1); rdwrFrame = (struct tftp_wr_rq *)&cBuf1; rdwrFrame->opcode=htons(1); rdwrFrame->data={'t','e','s','t','.','t','x','t','\\0','o','c','t','e','t','\\0'};
发送TFTP请求:
if (sendto (serv,cBuf1,19,0,(struct sockaddr *)&servaddr,serv_length) < 0) { bail ("Send the first requirment Frame error -- UDP"); }
这是我的问题:
TFTP服务器接收到错误的端口,我在做什么错? 我认为应该使用cliaddr.sin_port = htons(cliport);进行设置。
感谢您的帮助和问候
回答:
我的问题是,我将错误的套接字与错误的地址结构组合在一起
这是我的工作代码部分:
创建套接字:
serv = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (serv < 0) { bail("Unable to create socket tx!"); } cli = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (cli < 0) { bail("Unable to create socket rx!"); }
设置客户端和服务器地址:
memset(&servaddr,0,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(servport); servaddr.sin_addr.s_addr = inet_addr("192.168.1.152"); memset(&cliaddr,0,sizeof(cliaddr)); cliaddr.sin_family = AF_INET; cliaddr.sin_port = htons(cliport); cliaddr.sin_addr.s_addr = inet_addr("192.168.1.110");
连接并绑定:
if(bind(cli, (struct sockaddr *)&cliaddr, cli_length)<0) { bail("Unable to bind to adr & port!"); } if (connect(serv, (struct sockaddr *) &servaddr, serv_length) < 0) { bail("Unable to connect with the server!"); }
创建TFTP请求:
memset( &cBuf1, 0, sizeof cBuf1); rdwrFrame = (struct tftp_wr_rq *)&cBuf1; rdwrFrame->opcode=htons(1); rdwrFrame->data={'t','e','s','t','.','t','x','t',(char)0,'o','c','t','e','t',(char)0};
发送TFTP请求:
if (sendto (cli,cBuf1,19,0,(struct sockaddr *)&servaddr,serv_length) < 0) { bail ("Send the first requirment Frame error -- UDP"); }
接收数据:
recvfrom(cli,cBuf2,19,0,(struct sockaddr *)&cliaddr,(socklen_t*)&cli_length);
我分开添加了答案,因此没有人必须在原始帖子中进行搜索。
回答:
我的问题是,我将错误的套接字与错误的地址结构组合在一起
这是我的工作代码部分:
创建套接字:
serv = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (serv < 0) { bail("Unable to create socket tx!"); } cli = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (cli < 0) { bail("Unable to create socket rx!"); }
设置客户端和服务器地址:
memset(&servaddr,0,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(servport); servaddr.sin_addr.s_addr = inet_addr("192.168.1.152"); memset(&cliaddr,0,sizeof(cliaddr)); cliaddr.sin_family = AF_INET; cliaddr.sin_port = htons(cliport); cliaddr.sin_addr.s_addr = inet_addr("192.168.1.110");
连接并绑定:
if(bind(cli, (struct sockaddr *)&cliaddr, cli_length)<0) { bail("Unable to bind to adr & port!"); } if (connect(serv, (struct sockaddr *) &servaddr, serv_length) < 0) { bail("Unable to connect with the server!"); }
创建TFTP请求:
memset( &cBuf1, 0, sizeof cBuf1); rdwrFrame = (struct tftp_wr_rq *)&cBuf1; rdwrFrame->opcode=htons(1); rdwrFrame->data={'t','e','s','t','.','t','x','t',(char)0,'o','c','t','e','t',(char)0};
发送TFTP请求:
if (sendto (cli,cBuf1,19,0,(struct sockaddr *)&servaddr,serv_length) < 0) { bail ("Send the first requirment Frame error -- UDP"); }
接收数据:
recvfrom(cli,cBuf2,19,0,(struct sockaddr *)&cliaddr,(socklen_t*)&cli_length);
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