Function StrToPortRange

tools/ipfw/nat.c:226–268

}

static int
StrToPortRange (const char* str, const char* proto, port_range *portRange)
{
	char*	   sep;
	struct servent*	sp;
	char*		end;
	u_short	 loPort;
	u_short	 hiPort;

	/* First see if this is a service, return corresponding port if so. */
	sp = getservbyname (str,proto);
	if (sp) {
		SETLOPORT(*portRange, ntohs(sp->s_port));
		SETNUMPORTS(*portRange, 1);
		return 0;
	}

	/* Not a service, see if it's a single port or port range. */
	sep = strchr (str, '-');
	if (sep == NULL) {
		SETLOPORT(*portRange, strtol(str, &end, 10));
		if (end != str) {
			/* Single port. */
			SETNUMPORTS(*portRange, 1);
			return 0;
		}

		/* Error in port range field. */
		errx (EX_DATAERR, "%s/%s: unknown service", str, proto);
	}

	/* Port range, get the values and sanity check. */
	sscanf (str, "%hu-%hu", &loPort, &hiPort);
	SETLOPORT(*portRange, loPort);
	SETNUMPORTS(*portRange, 0);	/* Error by default */
	if (loPort <= hiPort)
		SETNUMPORTS(*portRange, hiPort - loPort + 1);

	if (GETNUMPORTS(*portRange) == 0)
		errx (EX_DATAERR, "invalid port range %s", str);

	return 0;
}

static int
StrToProto (const char* str)