Function str2ip

ip_addr.h:555–623

! \brief converts a str to an ipv4 address, returns the address or 0 on error Warning: the result is a pointer to a statically allocated structure */

/*! \brief converts a str to an ipv4 address, returns the address or 0 on error
   Warning: the result is a pointer to a statically allocated structure */
static inline struct ip_addr* str2ip(str* st)
{
	int i, j;
	unsigned char *limit;
	static struct ip_addr ip;
	unsigned char *s;

	if (st == NULL || st->s == NULL) goto error_null;
	s=(unsigned char*)st->s;

	/*init*/
	ip.u.addr32[0]=0;
	i=j=0;
	limit=(unsigned char*)(st->s + st->len);

	/* first char must be different than '0' */
	if ((*s > '9' ) || (*s < '0')) goto error_char;
	ip.u.addr[i]=ip.u.addr[i]*10+*s-'0';
	s++;
	j++;
	for(;s<limit ;s++){
		if (*s=='.'){
				i++;
				j=0;
				if (i>3) goto error_dots;
				s++;
				if (s==limit) break;
				if ( (*s <= '9' ) && (*s >= '0') ){
					j++;
					ip.u.addr[i]=ip.u.addr[i]*10+*s-'0';
				} else {
					goto error_char;
				}
		}else if ( (j==1) && (*s <= '9' ) && (*s >= '0') ){
				/* if first char is '0' then fail conversion */
				if (ip.u.addr[i]==0) goto error_char;
				j++;
				ip.u.addr[i]=ip.u.addr[i]*10+*s-'0';
		}else if ( (j==2) && (*s <= '9' ) && (*s >= '0') ){
				/* if first two chars are bigger then '25' then fail conversion */
				if (ip.u.addr[i]>25) goto error_char;
				/* if first three chars are bigger then '255' then fail conversion */
				if (ip.u.addr[i]==25 && *s > '5') goto error_char;
				j++;
				ip.u.addr[i]=ip.u.addr[i]*10+*s-'0';
		}else{
				//error unknown char
				goto error_char;
		}
	}
	if (i<3) goto error_dots;
	ip.af=AF_INET;
	ip.len=4;

	return &ip;
error_null:
	LM_DBG("Null pointer detected\n");
	return NULL;