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conf: Split add_dns{4,6}() out of get_dns()

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The logic handling which resolvers we add, and whether to add them,
is getting rather cramped in get_dns(): split it into separate
functions.

No functional changes intended.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2023-02-23 13:32:30 +00:00
parent ddf7097a71
commit 8ca907a3f0
1 changed files with 51 additions and 35 deletions
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86
conf.c
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@ -382,6 +382,53 @@ bind_fail:
die("Failed to bind any port for '-%c %s', exiting", optname, optarg);
}
/**
* add_dns4() - Possibly add the IPv4 address of a DNS resolver to configuration
* @c: Execution context
* @addr: Address found in /etc/resolv.conf
* @conf: Pointer to reference of current entry in array of IPv4 resolvers
*/
static void add_dns4(struct ctx *c, struct in_addr *addr, struct in_addr **conf)
{
/* Guest or container can only access local addresses via redirect */
if (IN4_IS_ADDR_LOOPBACK(addr)) {
if (!c->no_map_gw) {
**conf = c->ip4.gw;
(*conf)++;
}
} else {
**conf = *addr;
(*conf)++;
}
if (IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_host))
c->ip4.dns_host = *addr;
}
/**
* add_dns6() - Possibly add the IPv6 address of a DNS resolver to configuration
* @c: Execution context
* @addr: Address found in /etc/resolv.conf
* @conf: Pointer to reference of current entry in array of IPv6 resolvers
*/
static void add_dns6(struct ctx *c,
struct in6_addr *addr, struct in6_addr **conf)
{
/* Guest or container can only access local addresses via redirect */
if (IN6_IS_ADDR_LOOPBACK(addr)) {
if (!c->no_map_gw) {
memcpy(*conf, &c->ip6.gw, sizeof(**conf));
(*conf)++;
}
} else {
memcpy(*conf, addr, sizeof(**conf));
(*conf)++;
}
if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_host))
c->ip6.dns_host = *addr;
}
/**
* get_dns() - Get nameserver addresses from local /etc/resolv.conf
* @c: Execution context
@ -420,44 +467,13 @@ static void get_dns(struct ctx *c)
if (!dns4_set &&
dns4 - &c->ip4.dns[0] < ARRAY_SIZE(c->ip4.dns) - 1
&& inet_pton(AF_INET, p + 1, &dns4_tmp)) {
/* Guest or container can only access local
* addresses via local redirect
*/
if (IN4_IS_ADDR_LOOPBACK(&dns4_tmp)) {
if (!c->no_map_gw) {
*dns4 = c->ip4.gw;
dns4++;
}
} else {
*dns4 = dns4_tmp;
dns4++;
}
if (IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_host))
c->ip4.dns_host = dns4_tmp;
}
&& inet_pton(AF_INET, p + 1, &dns4_tmp))
add_dns4(c, &dns4_tmp, &dns4);
if (!dns6_set &&
dns6 - &c->ip6.dns[0] < ARRAY_SIZE(c->ip6.dns) - 1
&& inet_pton(AF_INET6, p + 1, &dns6_tmp)) {
/* Guest or container can only access local
* addresses via local redirect
*/
if (IN6_IS_ADDR_LOOPBACK(&dns6_tmp)) {
if (!c->no_map_gw) {
memcpy(dns6, &c->ip6.gw,
sizeof(*dns6));
dns6++;
}
} else {
memcpy(dns6, &dns6_tmp, sizeof(*dns6));
dns6++;
}
if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_host))
c->ip6.dns_host = dns6_tmp;
}
&& inet_pton(AF_INET6, p + 1, &dns6_tmp))
add_dns6(c, &dns6_tmp, &dns6);
} else if (!dnss_set && strstr(line, "search ") == line &&
s == c->dns_search) {
end = strpbrk(line, "\n");