Linux command
nc_openbsd 命令
文本
复制后可按需替换文件名、目录或参数。
常用示例
Listen for incoming connections on a port
nc.openbsd -l [8080]
Connect to a host and port
nc.openbsd [host] [port]
Scan ports without sending data
nc.openbsd -zv [host] [20-30]
Keep listening after client disconnects
nc.openbsd -k -l [port]
Connect via a SOCKS5 proxy
nc.openbsd -X 5 -x [proxy_host:proxy_port] [host] [port]
Use UDP instead of TCP
nc.openbsd -u [host] [port]
Transfer a file
nc.openbsd -l [port] > [received_file]
Send CRLF line endings
nc.openbsd -C [host] [port]
说明
nc.openbsd is the OpenBSD rewrite of netcat, a versatile networking utility for reading and writing data across TCP, UDP, and Unix-domain socket connections. It can open connections, send packets, listen on ports, perform port scanning, and handle both IPv4 and IPv6. Common uses include simple TCP proxying, shell scripts that interact with network services, network daemon testing, and ad-hoc file transfers. The -X and -x flags provide built-in SOCKS and HTTPS proxy support, and the -z flag enables lightweight port scanning. Unlike some other netcat implementations, the OpenBSD version does not have -c or -e options for executing programs on connection, as a security measure.
参数
- -4
- Use IPv4 addresses only.
- -6
- Use IPv6 addresses only.
- -C
- Send CRLF as line-ending (LF is translated to CR+LF).
- -D
- Enable debugging on the socket.
- -d
- Do not attempt to read from stdin.
- -F
- Pass the first connected socket to stdout using sendmsg(2) and exit.
- -i _interval_
- Sleep for interval seconds between lines of text sent and received.
- -k
- Keep listening for another connection after the current one completes (requires -l).
- -l
- Listen for an incoming connection rather than initiating one.
- -M _ttl_
- Set the TTL / hop limit of outgoing packets.
- -m _minttl_
- Drop incoming packets whose TTL / hop limit is under minttl.
- -N
- Shut down the network socket after EOF on stdin.
- -n
- Do not perform domain name resolution.
- -P _proxy_username_
- Username to present to a proxy server requiring authentication.
- -p _source_port_
- Specify the source port nc should use.
- -q _seconds_
- After EOF on stdin, wait the specified number of seconds and then quit.
- -r
- Choose source and/or destination ports randomly.
- -S
- Enable RFC 2385 TCP MD5 signature option.
- -s _sourceaddr_
- Set the source address to send packets from.
- -T _keyword_
- Change the IPv4 TOS or IPv6 traffic class value.
- -U
- Use Unix-domain sockets.
- -u
- Use UDP instead of TCP.
- -V _rtable_
- Set the routing table to be used.
- -v
- Produce more verbose output.
FAQ
What is the nc_openbsd command used for?
nc.openbsd is the OpenBSD rewrite of netcat, a versatile networking utility for reading and writing data across TCP, UDP, and Unix-domain socket connections. It can open connections, send packets, listen on ports, perform port scanning, and handle both IPv4 and IPv6. Common uses include simple TCP proxying, shell scripts that interact with network services, network daemon testing, and ad-hoc file transfers. The -X and -x flags provide built-in SOCKS and HTTPS proxy support, and the -z flag enables lightweight port scanning. Unlike some other netcat implementations, the OpenBSD version does not have -c or -e options for executing programs on connection, as a security measure.
How do I run a basic nc_openbsd example?
Run `nc.openbsd -l [8080]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -4 do in nc_openbsd?
Use IPv4 addresses only.