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...0.0.0.0:1,000 ...it 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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