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Correct some missing endian conversions of IPv4 addresses

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The INADDR_LOOPBACK constant is in host endianness, and similarly the
IN_MULTICAST macro expects a host endian address.  However, there are some
places in passt where we use those with network endian values.  This means
that passt will incorrectly allow you to set 127.0.0.1 or a multicast
address as the guest address or DNS forwarding address.  Add the necessary
conversions to correct this.

INADDR_ANY and INADDR_BROADCAST logically behave the same way, although
because they're palindromes it doesn't have an effect in practice.  Change
them to be logically correct while we're there, though.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2022-11-04 14:10:32 +11:00 committed by Stefano Brivio
parent 40fc9e6e7b
commit 2b793d94ca
2 changed files with 14 additions and 14 deletions
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26
conf.c
View file

@ -1164,11 +1164,11 @@ void conf(struct ctx *c, int argc, char **argv)
!IN6_IS_ADDR_LOOPBACK(&c->ip6.dns_fwd))
break;
if (c->ip4.dns_fwd == INADDR_ANY &&
if (c->ip4.dns_fwd == htonl(INADDR_ANY) &&
inet_pton(AF_INET, optarg, &c->ip4.dns_fwd) &&
c->ip4.dns_fwd != INADDR_ANY &&
c->ip4.dns_fwd != INADDR_BROADCAST &&
c->ip4.dns_fwd != INADDR_LOOPBACK)
c->ip4.dns_fwd != htonl(INADDR_ANY) &&
c->ip4.dns_fwd != htonl(INADDR_BROADCAST) &&
c->ip4.dns_fwd != htonl(INADDR_LOOPBACK))
break;
err("Invalid DNS forwarding address: %s", optarg);
@ -1362,12 +1362,12 @@ void conf(struct ctx *c, int argc, char **argv)
!IN6_IS_ADDR_MULTICAST(&c->ip6.addr))
break;
if (c->ip4.addr == INADDR_ANY &&
if (c->ip4.addr == htonl(INADDR_ANY) &&
inet_pton(AF_INET, optarg, &c->ip4.addr) &&
c->ip4.addr != INADDR_ANY &&
c->ip4.addr != INADDR_BROADCAST &&
c->ip4.addr != INADDR_LOOPBACK &&
!IN_MULTICAST(c->ip4.addr))
c->ip4.addr != htonl(INADDR_ANY) &&
c->ip4.addr != htonl(INADDR_BROADCAST) &&
c->ip4.addr != htonl(INADDR_LOOPBACK) &&
!IN_MULTICAST(ntohl(c->ip4.addr)))
break;
err("Invalid address: %s", optarg);
@ -1405,11 +1405,11 @@ void conf(struct ctx *c, int argc, char **argv)
!IN6_IS_ADDR_LOOPBACK(&c->ip6.gw))
break;
if (c->ip4.gw == INADDR_ANY &&
if (c->ip4.gw == htonl(INADDR_ANY) &&
inet_pton(AF_INET, optarg, &c->ip4.gw) &&
c->ip4.gw != INADDR_ANY &&
c->ip4.gw != INADDR_BROADCAST &&
c->ip4.gw != INADDR_LOOPBACK)
c->ip4.gw != htonl(INADDR_ANY) &&
c->ip4.gw != htonl(INADDR_BROADCAST) &&
c->ip4.gw != htonl(INADDR_LOOPBACK))
break;
err("Invalid gateway address: %s", optarg);

2
icmp.c
View file

@ -154,7 +154,7 @@ int icmp_tap_handler(const struct ctx *c, int af, const void *addr,
union icmp_epoll_ref iref = { .icmp.v6 = 0 };
struct sockaddr_in sa = {
.sin_family = AF_INET,
.sin_addr = { .s_addr = INADDR_ANY },
.sin_addr = { .s_addr = htonl(INADDR_ANY) },
};
struct icmphdr *ih;
int id, s;