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List:       freebsd-ipfw
Subject:    Re: ipfw table add problem
From:       "Alexander V. Chernikov" <melifaro () FreeBSD ! org>
Date:       2013-11-27 10:11:05
Message-ID: 5295C539.8070400 () FreeBSD ! org
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On 27.11.2013 11:56, Ian Smith wrote:
> On Tue, 26 Nov 2013 12:48:01 +0000, Ben Morrow wrote:
>   > To: freebsd-stable@freebsd.org
>
> Restoring cc ipfw@ and others after the inet_pton side?thread in
> stable@.  grepping /usr/src for inet_pton suggests that a behavioural
> change in inet_pton at this stage seems rather unlikely :)
>   
>   > Quoth Michael Butler <imb@protected-networks.net>:
>   > >
>   > > Misinterpreting "10.2.3.01" as "0.0.0.10/32" without so much as a
>   > > warning from either inet_pton() or ipfw is an egregious breach of POLA,
>   >
>   > That's not a bug in inet_pton, though, that's a bug in ipfw. It's
>   > blindly passing the string to atoi or some such when inet_pton fails,
>   > and ignoring the fact it doesn't consume the whole string.
>
> Indeed it is; strtol actually, which quits at the first (here decimal)
> non-digit.  It does return a pointer to it though, and a check for that
> character being '.' seems like a fair indicator of a failed dotted quad?
Fixed in r258677, thanks!

>
> http://svnweb.freebsd.org/base/head/sbin/ipfw/ipfw2.c?revision=250759&view=co
>
> 	if (ishexnumber(*arg) != 0 || *arg == ':') {
> 		/* Remove / if exists */
> 		if ((p = strchr(arg, '/')) != NULL) {
> 			*p = '\0';
> 			mask = atoi(p + 1);
> 		}
>
> 		if (inet_pton(AF_INET, arg, paddr) == 1) {
> 			...
> 		} else if (inet_pton(AF_INET6, arg, paddr) == 1) {
> 			...
> 		} else {
> 			/* Port or any other key */
> 			key = strtol(arg, &p, 10);
> 			/* Skip non-base 10 entries like 'fa1' */
> 			if (p != arg) {
> 				pkey = (uint32_t *)paddr;
> 				*pkey = htonl(key);
> 				type = IPFW_TABLE_CIDR;
> 				addrlen = sizeof(uint32_t);
> 			}
> 		}
> 	}
>
> 	if (type == 0 && strchr(arg, '.') == NULL) {
> 		/* Assume interface name. Copy significant data only */
> 		...
> 	}
>
> 	if (type == 0) {
> 		if (lookup_host(arg, (struct in_addr *)paddr) != 0)
> 			errx(EX_NOHOST, "hostname ``%s'' unknown", arg);
> 		...
> 	}
> 	...
> }
>
> I'm mostly a pascal programmer (oh, the shame! :) so I can easily misuse
> C pointers, but my reading of strtol(3) leads to suggest something like:
>
> 		} else {
> 			/* Port or any other key */
> 			key = strtol(arg, &p, 10);
> 			/* Skip non-base 10 entries like 'fa1' */
> 			if (p != arg) {
> +				/* IPv4 address that failed inet_pton */
> +				if (*p == '.') {
> +					errx(EX_DATAERR, "bad IPv4 address");
> +				}
> 				pkey = (uint32_t *)paddr;
> 				*pkey = htonl(key);
> 				type = IPFW_TABLE_CIDR;
> 				addrlen = sizeof(uint32_t);
> 			}
> 		}
>
> cheers, Ian
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>

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