void net_check_cfg(void) {
EUID_ASSERT();
int net_configured = 0;
if (cfg.bridge0.configured)
net_configured++;
if (cfg.bridge1.configured)
net_configured++;
if (cfg.bridge2.configured)
net_configured++;
if (cfg.bridge3.configured)
net_configured++;
int if_configured = 0;
if (cfg.interface0.configured)
if_configured++;
if (cfg.interface1.configured)
if_configured++;
if (cfg.interface2.configured)
if_configured++;
if (cfg.interface3.configured)
if_configured++;
// --defaultgw requires a network or an interface
if (cfg.defaultgw && net_configured == 0 && if_configured == 0) {
fprintf(stderr, "Error: option --defaultgw requires at least one network or one interface to be configured\n");
exit(1);
}
if (net_configured == 0) // nothing to check
return;
// --net=none
if (arg_nonetwork && net_configured) {
fprintf(stderr, "Error: --net and --net=none are mutually exclusive\n");
exit(1);
}
// check default gateway address or assign one
assert(cfg.bridge0.configured);
if (cfg.defaultgw)
check_default_gw(cfg.defaultgw);
else {
// first network is a regular bridge
if (cfg.bridge0.macvlan == 0)
cfg.defaultgw = cfg.bridge0.ip;
// first network is a mac device
else {
// get the host default gw
EUID_ROOT(); // rise permissions for grsecurity
// Error fopen:network_get_defaultgw(479): Permission denied
uint32_t gw = network_get_defaultgw();
EUID_USER();
// check the gateway is network range
if (in_netrange(gw, cfg.bridge0.ip, cfg.bridge0.mask))
gw = 0;
cfg.defaultgw = gw;
}
}
}
void net_check_cfg(void) {
int net_configured = 0;
if (cfg.bridge0.configured)
net_configured++;
if (cfg.bridge1.configured)
net_configured++;
if (cfg.bridge2.configured)
net_configured++;
if (cfg.bridge3.configured)
net_configured++;
// --defaultgw requires a network
if (cfg.defaultgw && net_configured == 0) {
fprintf(stderr, "Error: option --defaultgw requires at least one network to be configured\n");
exit(1);
}
if (net_configured == 0) // nothing to check
return;
// --net=none
if (arg_nonetwork && net_configured) {
fprintf(stderr, "Error: --net and --net=none are mutually exclusive\n");
exit(1);
}
// check default gateway address or assign one
assert(cfg.bridge0.configured);
if (cfg.defaultgw)
check_default_gw(cfg.defaultgw);
else {
// first network is a regular bridge
if (cfg.bridge0.macvlan == 0)
cfg.defaultgw = cfg.bridge0.ip;
// first network is a mac device
else {
// get the host default gw
uint32_t gw = network_get_defaultgw();
// check the gateway is network range
if (in_netrange(gw, cfg.bridge0.ip, cfg.bridge0.mask))
gw = 0;
cfg.defaultgw = gw;
}
if (cfg.defaultgw == 0)
fprintf(stderr, "Warning: default network gateway not set.\n");
else
fprintf(stderr, "Using %d.%d.%d.%d as default gateway.\n", PRINT_IP(cfg.defaultgw));
}
}
