Portscanner
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This program, as the name suggests, is a port scanner written in c.
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Much of the information I required to be able to build this came from a simple (and extremely long) guide on how to do network programming. This can be found at:
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To note, I used the guide to get a better overview of the usage of system calls via sys/types and sys/socket. Any supplemental material that was referenced was found in the man pages.
Usage:
- To use this program, you may supply any number of arguments in the order specfied above.
- An IP address may be a domain name or an actual IP address.
- The maximum port is by default set to 100, but it may be set as high as 65535.
- Lastly, suppling more than two arguments will cause the program to only print out the open ports, rather than any ports that may be closed or blocked.
Example:
./port_scanner IPADDRESS MAXPORT --only_open
IPADDRESS= the ip address of the host to scan (can be a domain name or an IP)MAXPORT= the highest port to scan up to (highest possible is 65535)--only_open= If there is even a 3rd argument, closed ports are ignored.