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1.8 KiB

#include "scan.h"
#include "ip4.h"
#include "ip6.h"
/*
* IPv6 addresses are really ugly to parse.
* Syntax: (h = hex digit)
* 1. hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh
* 2. any number of 0000 may be abbreviated as "::", but only once
* 3. The last two words may be written as IPv4 address
*/
unsigned int scan_ip6(const char *s,char ip[16])
{
unsigned int i;
unsigned int len=0;
unsigned long u;
char suffix[16];
int prefixlen=0;
int suffixlen=0;
if ((i=scan_ip4(s,ip+12))) {
for (len=0; len<12; ++len) ip[len]=V4mappedprefix[len];
return i;
}
for (i=0; i<16; i++) ip[i]=0;
for (;;) {
if (*s == ':') {
++len;
++s;
if (*s == ':') { /* Found "::", skip to part 2 */
++len;
++s;
break;
}
}
i = scan_xlong(s,&u);
if (!i) return 0;
if (prefixlen==12 && s[i]=='.') {
/* the last 4 bytes may be written as IPv4 address */
i=scan_ip4(s,ip+12);
if (i)
return i+len;
else
return 0;
}
ip[prefixlen++] = (u >> 8);
ip[prefixlen++] = (u & 255);
s += i; len += i;
if (prefixlen==16)
return len;
}
/* part 2, after "::" */
for (;;) {
if (*s == ':') {
if (suffixlen==0)
break;
s++;
len++;
} else if (suffixlen)
break;
i = scan_xlong(s,&u);
if (!i) {
if (suffixlen)
--len;
break;
}
if (suffixlen+prefixlen<=12 && s[i]=='.') {
int j=scan_ip4(s,suffix+suffixlen);
if (j) {
suffixlen+=4;
len+=j;
break;
} else
prefixlen=12-suffixlen; /* make end-of-loop test true */
}
suffix[suffixlen++] = (u >> 8);
suffix[suffixlen++] = (u & 255);
s += i; len += i;
if (prefixlen+suffixlen==16)
break;
}
for (i=0; i<suffixlen; i++)
ip[16-suffixlen+i] = suffix[i];
return len;
}