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tests: add support for IPv4/IPv6 loopback network ID fallback in torture_config_match_localnetwork.c

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Signed-off-by: Francesco <eferollo@gmail.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
This commit is contained in:
Francesco Rollo
2024-07-31 12:19:14 +02:00
committed by Jakub Jelen
parent b804aa9286
commit b0b2e8fefd
1 changed files with 58 additions and 20 deletions
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78
tests/unittests/torture_config_match_localnetwork.c
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@ -131,7 +131,10 @@ subnet_mask_to_prefix_length_6(struct in6_addr subnet_mask)
* @brief helper function returning the IPv4 and IPv6 network ID
* (in CIDR format) corresponding to any of the running local interfaces.
* The network interface corresponding to IPv4 and IPv6 network ID may be
* different ("loopback" local interface is ignored).
* different.
*
* @note If no non-loopback network interfaces are found for IPv4 or
* IPv6, the function will fall back to using the loopback addresses.
*/
static int
get_network_id(char *net_id_4, char *net_id_6)
@ -142,8 +145,10 @@ get_network_id(char *net_id_4, char *net_id_6)
struct sockaddr_in netmask;
struct sockaddr_in6 netmask6;
char address[NI_MAXHOST], *a = NULL;
char *network_id_str = NULL, network_id_str6[INET6_ADDRSTRLEN];
int i, prefix_length, rc, found_4 = 0, found_6 = 0;
char *network_id_str = NULL, network_id_str6[INET6_ADDRSTRLEN],
lo_net_id_4[NI_MAXHOST], lo_net_id_6[NI_MAXHOST];
int i, prefix_length, rc;
int found_4 = 0, found_lo_4 = 0, found_6 = 0, found_lo_6 = 0;
socklen_t sa_len;
ZERO_STRUCT(addr);
@ -167,11 +172,6 @@ get_network_id(char *net_id_4, char *net_id_6)
continue;
}
/* Skip loopback interface */
if (strcmp(ifa->ifa_name, "lo") == 0) {
continue;
}
switch (ifa->ifa_addr->sa_family) {
case AF_INET:
if (found_4) {
@ -224,12 +224,22 @@ get_network_id(char *net_id_4, char *net_id_6)
continue;
}
snprintf(net_id_4,
NI_MAXHOST,
"%s/%u",
network_id_str,
prefix_length);
found_4 = 1;
if (strcmp(ifa->ifa_name, "lo") == 0) {
/* Store it temporarily in case needed for fallback */
snprintf(lo_net_id_4,
NI_MAXHOST,
"%s/%u",
network_id_str,
prefix_length);
found_lo_4 = 1;
} else {
snprintf(net_id_4,
NI_MAXHOST,
"%s/%u",
network_id_str,
prefix_length);
found_4 = 1;
}
} else if (ifa->ifa_addr->sa_family == AF_INET6) {
/* Remove interface in case of IPv6 address: addr%interface */
@ -265,15 +275,43 @@ get_network_id(char *net_id_4, char *net_id_6)
continue;
}
snprintf(net_id_6,
NI_MAXHOST,
"%s/%u",
network_id_str6,
prefix_length);
found_6 = 1;
if (strcmp(ifa->ifa_name, "lo") == 0) {
/* Store it temporarily in case needed for fallback */
snprintf(lo_net_id_6,
NI_MAXHOST,
"%s/%u",
network_id_str6,
prefix_length);
found_lo_6 = 1;
} else {
snprintf(net_id_6,
NI_MAXHOST,
"%s/%u",
network_id_str6,
prefix_length);
found_6 = 1;
}
}
}
/*
* Fallback to the loopback network ID (127.0.0.0/8) if no other
* IPv4 network ID has been found.
*/
if (!found_4 && found_lo_4) {
snprintf(net_id_4, NI_MAXHOST, "%s", lo_net_id_4);
found_4 = 1;
}
/*
* Fallback to the loopback network ID (::1/128) if no other
* IPv6 network ID has been found.
*/
if (!found_6 && found_lo_6) {
snprintf(net_id_6, NI_MAXHOST, "%s", lo_net_id_6);
found_6 = 1;
}
freeifaddrs(ifaddrs);
out: