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/*
* Trim square brackets off the outside of an IPv6 address literal.
* Leave all other strings unchanged. Returns a fresh dynamically
* allocated string.
*/
#include <ctype.h>
#include <string.h>
#include "defs.h"
#include "misc.h"
char *host_strduptrim(const char *s)
{
if (s[0] == '[') {
const char *p = s+1;
int colons = 0;
while (*p && *p != ']') {
if (isxdigit((unsigned char)*p))
/* OK */;
else if (*p == ':')
colons++;
else
break;
p++;
}
if (*p == '%') {
/*
* This delimiter character introduces an RFC 4007 scope
* id suffix (e.g. suffixing the address literal with
* %eth1 or %2 or some such). There's no syntax
* specification for the scope id, so just accept anything
* except the closing ].
*/
p += strcspn(p, "]");
}
if (*p == ']' && !p[1] && colons > 1) {
/*
* This looks like an IPv6 address literal (hex digits and
* at least two colons, plus optional scope id, contained
* in square brackets). Trim off the brackets.
*/
return dupprintf("%.*s", (int)(p - (s+1)), s+1);
}
}
/*
* Any other shape of string is simply duplicated.
*/
return dupstr(s);
}
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