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netconfig: Refactor netconfig_set_dns

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Refactor netconfig_set_dns to be a bit easier to follow and remove use
of macros.  Also bail out early if no DNS addresses are provided instead
of building an empty DNS list since resolve_set_dns() simply returns if
a NULL or empty DNS list is provided.
This commit is contained in:
Andrew Zaborowski 2021-09-08 23:44:40 +02:00 committed by Denis Kenzior
parent 97587e399f
commit 8b573fe398
1 changed files with 84 additions and 69 deletions
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153
src/netconfig.c
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@ -152,20 +152,6 @@ static struct netconfig *netconfig_find(uint32_t ifindex)
return NULL;
}
#define APPEND_STRDUPV(dest, index, src) \
do { \
char **p; \
for (p = src; p && *p; p++) \
dest[index++] = l_strdup(*p); \
} while (0) \
#define APPENDV(dest, index, src) \
do { \
char **p; \
for (p = src; p && *p; p++) \
dest[index++] = *p; \
} while (0) \
static inline char *netconfig_ipv4_to_string(uint32_t addr)
{
struct in_addr in_addr = { .s_addr = addr };
@ -196,6 +182,72 @@ static inline char *netconfig_ipv6_to_string(const uint8_t *addr)
return addr_str;
}
static char **netconfig_get_dns_list(struct netconfig *netconfig, int af,
const uint8_t **out_dns_mac)
{
const struct ie_fils_ip_addr_response_info *fils =
netconfig->fils_override;
if (af == AF_INET) {
const struct l_dhcp_lease *lease;
if (netconfig->dns4_overrides)
return l_strv_copy(netconfig->dns4_overrides);
if (netconfig->rtm_protocol != RTPROT_DHCP)
return NULL;
if (fils && fils->ipv4_dns) {
char **dns_list = l_new(char *, 2);
if (!l_memeqzero(fils->ipv4_dns_mac, 6) &&
out_dns_mac &&
util_ip_subnet_match(
fils->ipv4_prefix_len,
&fils->ipv4_addr,
&fils->ipv4_dns))
*out_dns_mac = fils->ipv4_dns_mac;
dns_list[0] = netconfig_ipv4_to_string(fils->ipv4_dns);
return dns_list;
}
if (!(lease = l_dhcp_client_get_lease(netconfig->dhcp_client)))
return NULL;
return l_dhcp_lease_get_dns(lease);
} else {
const struct l_dhcp6_lease *lease;
if (netconfig->dns6_overrides)
return l_strv_copy(netconfig->dns6_overrides);
if (netconfig->rtm_v6_protocol != RTPROT_DHCP)
return NULL;
if (fils && !l_memeqzero(fils->ipv6_dns, 16)) {
char **dns_list = l_new(char *, 2);
if (!l_memeqzero(fils->ipv6_dns_mac, 6) &&
out_dns_mac &&
util_ip_subnet_match(
fils->ipv6_prefix_len,
fils->ipv6_addr,
fils->ipv6_dns))
*out_dns_mac = fils->ipv6_dns_mac;
dns_list[0] = netconfig_ipv6_to_string(fils->ipv6_dns);
return dns_list;
}
if (!(lease = l_dhcp6_client_get_lease(
netconfig->dhcp6_client)))
return NULL;
return l_dhcp6_lease_get_dns(lease);
}
}
static void netconfig_set_neighbor_entry_cb(int error,
uint16_t type, const void *data,
uint32_t len, void *user_data)
@ -207,67 +259,34 @@ static void netconfig_set_neighbor_entry_cb(int error,
static int netconfig_set_dns(struct netconfig *netconfig)
{
char **dns6_list = NULL;
char **dns4_list = NULL;
unsigned int n_entries = 0;
char **dns_list;
const uint8_t *fils_dns4_mac = NULL;
const uint8_t *fils_dns6_mac = NULL;
char **dns4_list = netconfig_get_dns_list(netconfig, AF_INET,
&fils_dns4_mac);
char **dns6_list = netconfig_get_dns_list(netconfig, AF_INET6,
&fils_dns6_mac);
unsigned int n_entries4 = l_strv_length(dns4_list);
unsigned int n_entries6 = l_strv_length(dns6_list);
char **dns_list;
const struct ie_fils_ip_addr_response_info *fils =
netconfig->fils_override;
if (!netconfig->dns4_overrides &&
netconfig->rtm_protocol == RTPROT_DHCP) {
const struct l_dhcp_lease *lease;
if (!dns4_list && !dns6_list)
return 0;
if (fils && fils->ipv4_dns) {
dns4_list = l_new(char *, 2);
dns4_list[0] = netconfig_ipv4_to_string(fils->ipv4_dns);
dns_list = dns4_list;
if (!l_memeqzero(fils->ipv4_dns_mac, 6) &&
util_ip_subnet_match(
fils->ipv4_prefix_len,
&fils->ipv4_addr,
&fils->ipv4_dns))
fils_dns4_mac = fils->ipv4_dns_mac;
} else if ((lease = l_dhcp_client_get_lease(
netconfig->dhcp_client)))
dns4_list = l_dhcp_lease_get_dns(lease);
if (dns6_list) {
dns_list = l_realloc(dns_list,
sizeof(char *) * (n_entries4 + n_entries6 + 1));
memcpy(dns_list + n_entries4, dns6_list,
sizeof(char *) * (n_entries6 + 1));
/* Contents now belong to dns_list, so no l_strfreev */
l_free(dns6_list);
}
if (!netconfig->dns6_overrides &&
netconfig->rtm_v6_protocol == RTPROT_DHCP) {
const struct l_dhcp6_lease *lease;
if (fils && !l_memeqzero(fils->ipv6_dns,
16)) {
dns6_list = l_new(char *, 2);
dns6_list[0] = netconfig_ipv6_to_string(fils->ipv6_dns);
if (!l_memeqzero(fils->ipv6_dns_mac, 6) &&
util_ip_subnet_match(
fils->ipv6_prefix_len,
fils->ipv6_addr,
fils->ipv6_dns))
fils_dns6_mac = fils->ipv6_dns_mac;
} else if ((lease = l_dhcp6_client_get_lease(
netconfig->dhcp6_client)))
dns6_list = l_dhcp6_lease_get_dns(lease);
}
n_entries += l_strv_length(netconfig->dns4_overrides);
n_entries += l_strv_length(netconfig->dns6_overrides);
n_entries += l_strv_length(dns4_list);
n_entries += l_strv_length(dns6_list);
dns_list = l_new(char *, n_entries + 1);
n_entries = 0;
APPEND_STRDUPV(dns_list, n_entries, netconfig->dns4_overrides);
APPENDV(dns_list, n_entries, dns4_list);
APPEND_STRDUPV(dns_list, n_entries, netconfig->dns6_overrides);
APPENDV(dns_list, n_entries, dns6_list);
resolve_set_dns(netconfig->resolve, dns_list);
l_strv_free(dns_list);
if (fils_dns4_mac && !l_rtnl_neighbor_set_hwaddr(rtnl,
netconfig->ifindex, AF_INET,
@ -283,10 +302,6 @@ static int netconfig_set_dns(struct netconfig *netconfig)
NULL))
l_debug("l_rtnl_neighbor_set_hwaddr failed");
l_strv_free(dns_list);
/* Contents belonged to dns_list, so not l_strfreev */
l_free(dns4_list);
l_free(dns6_list);
return 0;
}