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ipfw: Support the literal IPv6 address syntax in the fwd command.

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Discussed with:	rgrimes, Lutz Donnerhacke
Submitted by:	Neel Chauhan <neel AT neelc DOT org>
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D24011
This commit is contained in:
Mark Johnston 2020-06-25 19:27:22 +00:00
parent 90297b6471
commit a3349dd906
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362619
1 changed files with 35 additions and 24 deletions
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59
sbin/ipfw/ipfw2.c
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@ -3990,8 +3990,7 @@ compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate)
* IPv4 a.b.c.d,port
* IPv4 a.b.c.d:port
* IPv6 w:x:y::z,port
* The ':' can only be used with hostname and IPv4 address.
* XXX-BZ Should we also support [w:x:y::z]:port?
* IPv6 [w:x:y::z]:port
*/
struct sockaddr_storage result;
struct addrinfo *res;
@ -4001,33 +4000,45 @@ compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate)
NEED1("missing forward address[:port]");
/*
* locate the address-port separator (':' or ',')
*/
s = strchr(*av, ',');
if (s == NULL) {
/* Distinguish between IPv4:port and IPv6 cases. */
s = strchr(*av, ':');
if (s && strchr(s+1, ':'))
s = NULL; /* no port */
}
port_number = 0;
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;
}
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)++;
/*
* 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;
/* 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.