Validating ip address c

int Is Digit(char ch) #define FIND_IP_START 0 #define FIND_IP_DIGIT 1 #define FIND_IP_DIG_OR_DEC 2 #define FIND_IP_DECIMAL 3 #define FIND_IP_DIG_OR_END 4 #define FIND_IP_END 5 #define FIND_IP_DONE 6 char * String Contains Valid Ip Address(char * input_buf_pointer) #define MAX_HEX_NUMBER_COUNT 8 int ishexdigit(char ch) int Is Ip6str(char *str) { int hdcount=0; int hncount=0; int err=0; int packed=0; if(*str==':') if(ishexdigit(*str)==0) hdcount=1; hncount=1; str ; while(err==0&&*str!=0) { if(*str==':') { str ; if(*str==':') { if(packed==1) err=1; else Function Is Ip4str(char *str) test if string contains IP address version four address format.So, back to the drawing board: rc = sscanf(ipadd, "%3u.%3u.%3u.%3u%c%u%c", &b1, &b2, &b3, &b4, &sep, &port, &c); if (rc ! So, back to the drawing board: rc = sscanf(ipadd, "%3u.%3u.%3u.%3u%c%u%c", &b1, &b2, &b3, &b4, &sep, &port, &c); if (rc ! You could also argue that because of locale's the above will catch...,000 won't if the thousands seperator is '.' (which it is in germany for instance) ... The truley strict versions I've seen/written don't use scanf().Currently I have the following code to validate the first format. Also, please suggest a mechanism tovalidate the second format(address:port) also.[code snipped] if ((b1 | b2 | b3 | b4) Yes, 'unsigned' a short name for 'unsigned int', like 'long' is a shortname for 'long int' etc.#define PORTMAX 65535 /* or whatever appropriate */ int validate IP(char *ipadd) Trivia quiz: what is the purpose of the last check?

Basically, the input can be either in IPAddressv4 or IPAddressv4:portformat.This blog demnostrates how to validate an ip address without doing much of code and without using regex, here i have taken help of System. The Try Parse function of IPAddress determines whether an IP Address is a validate IP Address or not.See the below demonstrator that helps validating IPAddress.Taking this into account and previosly defining a variable to handle the incoming data buffer like this: // Although the RFC says ipv6 octects like 001 are not valid, it would be risky // not to accept those #define decoct "([01]? [0-9]|2[0-4][0-0]|25[0-5])" #define ipv4 "(" decoct "\." decoct "\." decoct "\." decoct ")" I needed to figure out if incoming string "contains" a valid IP address, and to return a pointer to the portion of the incoming string that is the valid IP address, if so. Here is code that seems to work, although not well tested yet, I just wrote it and gave it a quick try.I didn't add a check yet for limiting the numbers to one-byte values, but do check to ensure that they are limited to three digit numbers.

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Currently I have the following code to validate the first format. Also, please suggest a mechanism tovalidate the second format(address:port) also.#define INVALID -1#define VALID 0int validate IP(char *ipadd) This looks exactly like code I've posted a couple of years ago.

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