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My program opens a socket with this function:
sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)
After finish sending data the socket is closed:
close(sockfd);
But the issue is when the program doesn't run well and is blocking. Thereby the socket will not be closed.
How can I check all sockets opened under Linux OS ?
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One of the simplest ways to check for open ports is to use NetStat.exe. You can find this tool in the System32 folder on Windows 10. With NetStat, you can see open ports or ports that a specific host uses.
For most socket interfaces, the maximum number of sockets allowed per each connection between an application and the TCP/IP sockets interface is 65535.
If you want to search for symbolic links when -L is in effect, use -xtype. s socket D door (Solaris) To search for more than one type at once, you can supply the combined list of type letters separated by a comma `,' (GNU extension). it worked with find .
Also you can use ss utility to dump sockets statistics.
To dump summary:
ss -s
Total: 91 (kernel 0)
TCP: 18 (estab 11, closed 0, orphaned 0, synrecv 0, timewait 0/0), ports 0
Transport Total IP IPv6
* 0 - -
RAW 0 0 0
UDP 4 2 2
TCP 18 16 2
INET 22 18 4
FRAG 0 0 0
To display all sockets:
ss -a
To display UDP sockets:
ss -u -a
To display TCP sockets:
ss -t -a
Here you can read ss man: ss
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/proc/net/tcp -a list of open tcp sockets
/proc/net/udp -a list of open udp sockets
/proc/net/raw -a list all the 'raw' sockets
These are the files, use cat command to view them. For example:
cat /proc/net/tcp
You can also use the lsof command.
lsof is a command meaning "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them.
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You can use netstat command
netstat --listen
To display open ports and established TCP connections,
netstat -vatn
To display only open UDP ports try the following command:
netstat -vaun
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