Difference between revisions of "Script to use if netstat not available"
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(Created page with "https://staaldraad.github.io/2017/12/20/netstat-without-netstat/ <pre> #!/bin/bash awk 'function hextodec(str,ret,n,i,k,c){ ret = 0 n = length(str) for (i = 1; i...") |
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https://staaldraad.github.io/2017/12/20/netstat-without-netstat/ | https://staaldraad.github.io/2017/12/20/netstat-without-netstat/ | ||
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| − | awk 'function hextodec(str,ret,n,i,k,c){ | + | #!/bin/bash |
| − | + | ||
| − | + | awk 'function hextodec(str,ret,n,i,k,c){ | |
| − | + | ret = 0 | |
| − | + | n = length(str) | |
| − | + | for (i = 1; i <= n; i++) { | |
| − | + | c = [[tolower]](substr(str, i, 1)) | |
| − | + | k = index("123456789abcdef", c) | |
| − | + | ret = ret * 16 + k | |
| − | } | + | } |
| − | function getIP(str,ret){ | + | return ret |
| − | + | } | |
| − | + | function getIP(str,ret){ | |
| − | + | ret=hextodec(substr(str,index(str,":")-2,2)); | |
| − | + | for (i=5; i>0; i-=2) { | |
| − | + | ret = ret"."hextodec(substr(str,i,2)) | |
| − | + | } | |
| − | } | + | ret = ret":"hextodec(substr(str,index(str,":")+1,4)) |
| − | NR > 1 {{if(NR==2)print "Local - Remote";local=getIP($2);remote=getIP($3)}{print local" - "remote}}' /proc/net/tcp | + | return ret |
| − | + | } | |
| + | NR > 1 {{if(NR==2)print "Local - Remote";local=getIP($2);remote=getIP($3)}{print local" - "remote}}' /proc/net/tcp | ||
Latest revision as of 17:17, 15 August 2022
https://staaldraad.github.io/2017/12/20/netstat-without-netstat/
#!/bin/bash
awk 'function hextodec(str,ret,n,i,k,c){
ret = 0
n = length(str)
for (i = 1; i <= n; i++) {
c = tolower(substr(str, i, 1))
k = index("123456789abcdef", c)
ret = ret * 16 + k
}
return ret
}
function getIP(str,ret){
ret=hextodec(substr(str,index(str,":")-2,2));
for (i=5; i>0; i-=2) {
ret = ret"."hextodec(substr(str,i,2))
}
ret = ret":"hextodec(substr(str,index(str,":")+1,4))
return ret
}
NR > 1 {{if(NR==2)print "Local - Remote";local=getIP($2);remote=getIP($3)}{print local" - "remote}}' /proc/net/tcp
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