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conf: Move adding of a nameserver from resolv.conf into subfunction

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get_dns() is already quite deeply nested, and future changes I have in
mind will add more complexity.  Prepare for this by splitting out the
adding of a single nameserver to the configuration into its own function.

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 2024-08-21 14:20:04 +10:00 committed by Stefano Brivio
parent 1d10760c9f
commit 7c083ee41c
1 changed files with 26 additions and 7 deletions
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33
conf.c
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@ -421,6 +421,29 @@ static unsigned add_dns6(struct ctx *c, struct in6_addr *addr, unsigned idx)
return added;
}
/**
* add_dns_resolv() - Possibly add ns from host resolv.conf to configuration
* @c: Execution context
* @nameserver: Nameserver address string from /etc/resolv.conf
* @idx4: Pointer to index of current entry in array of IPv4 resolvers
* @idx6: Pointer to index of current entry in array of IPv6 resolvers
*
* @idx4 or @idx6 may be NULL, in which case resolvers of the corresponding type
* are ignored.
*/
static void add_dns_resolv(struct ctx *c, const char *nameserver,
unsigned *idx4, unsigned *idx6)
{
struct in6_addr ns6;
struct in_addr ns4;
if (idx4 && inet_pton(AF_INET, nameserver, &ns4))
*idx4 += add_dns4(c, &ns4, *idx4);
if (idx6 && inet_pton(AF_INET6, nameserver, &ns6))
*idx6 += add_dns6(c, &ns6, *idx6);
}
/**
* get_dns() - Get nameserver addresses from local /etc/resolv.conf
* @c: Execution context
@ -431,8 +454,6 @@ static void get_dns(struct ctx *c)
unsigned dns4_idx = 0, dns6_idx = 0;
struct fqdn *s = c->dns_search;
struct lineread resolvconf;
struct in6_addr dns6_tmp;
struct in_addr dns4_tmp;
ssize_t line_len;
char *line, *end;
const char *p;
@ -459,11 +480,9 @@ static void get_dns(struct ctx *c)
if (end)
*end = 0;
if (!dns4_set && inet_pton(AF_INET, p + 1, &dns4_tmp))
dns4_idx += add_dns4(c, &dns4_tmp, dns4_idx);
if (!dns6_set && inet_pton(AF_INET6, p + 1, &dns6_tmp))
dns6_idx += add_dns6(c, &dns6_tmp, dns6_idx);
add_dns_resolv(c, p + 1,
dns4_set ? NULL : &dns4_idx,
dns6_set ? NULL : &dns6_idx);
} else if (!dnss_set && strstr(line, "search ") == line &&
s == c->dns_search) {
end = strpbrk(line, "\n");