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sbin/ipfw: Fix parsing error in table based forward

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The argument parser does not recognise the optional port for an
"tablearg" argument.  Fix simplifies the code by make the internal
representation expicit for the parser.

PR:		252744
MFC:		1 week
Reported by:	<bugs.freebsd.org@mx.zzux.com>
Approved by:	nc
Tested by:	<bugs.freebsd.org@mx.zzux.com>
Differential Revision: https://reviews.freebsd.org/D30164
This commit is contained in:
Lutz Donnerhacke 2021-05-07 20:59:34 +02:00
parent 9146c6240d
commit 6cb13813ca
1 changed files with 42 additions and 45 deletions
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87
sbin/ipfw/ipfw2.c
View file

@ -4021,57 +4021,54 @@ compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate)
NEED1("missing forward address[:port]");
if (_substrcmp(*av, "tablearg") == 0) {
family = PF_INET;
((struct sockaddr_in*)&result)->sin_addr.s_addr =
INADDR_ANY;
} else {
/*
* Are we an bracket-enclosed IPv6 address?
*/
if (strchr(*av, '['))
(*av)++;
if (strncmp(*av, "tablearg", 8) == 0)
memcpy(++(*av), "0.0.0.0", 7);
/*
* locate the address-port separator (':' or ',')
*/
s = strchr(*av, ',');
if (s == NULL) {
s = strchr(*av, ']');
/* Prevent erroneous parsing on brackets. */
if (s != NULL)
*(s++) = '\0';
else
s = *av;
/*
* Are we an bracket-enclosed IPv6 address?
*/
if (strchr(*av, '['))
(*av)++;
/* Distinguish between IPv4:port and IPv6 cases. */
s = strchr(s, ':');
if (s && strchr(s+1, ':'))
s = NULL; /* no port */
}
if (s != NULL) {
/* Terminate host portion and set s to start of port. */
/*
* locate the address-port separator (':' or ',')
*/
s = strchr(*av, ',');
if (s == NULL) {
s = strchr(*av, ']');
/* Prevent erroneous parsing on brackets. */
if (s != NULL)
*(s++) = '\0';
i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
if (s == end)
errx(EX_DATAERR,
"illegal forwarding port ``%s''", s);
port_number = (u_short)i;
}
else
s = *av;
/*
* Resolve the host name or address to a family and a
* network representation of the address.
*/
if (getaddrinfo(*av, NULL, NULL, &res))
errx(EX_DATAERR, NULL);
/* Just use the first host in the answer. */
family = res->ai_family;
memcpy(&result, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
/* Distinguish between IPv4:port and IPv6 cases. */
s = strchr(s, ':');
if (s && strchr(s+1, ':'))
s = NULL; /* no port */
}
if (s != NULL) {
/* Terminate host portion and set s to start of port. */
*(s++) = '\0';
i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
if (s == end)
errx(EX_DATAERR,
"illegal forwarding port ``%s''", s);
port_number = (u_short)i;
}
/*
* Resolve the host name or address to a family and a
* network representation of the address.
*/
if (getaddrinfo(*av, NULL, NULL, &res))
errx(EX_DATAERR, NULL);
/* Just use the first host in the answer. */
family = res->ai_family;
memcpy(&result, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
if (family == PF_INET) {
ipfw_insn_sa *p = (ipfw_insn_sa *)action;