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coap_address.c: Fix IPv4 broadcast checks

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Jon Shallow authored and Jon Shallow committed 2023-10-19 16:05:28 +01:00
1 parent 6addbef1b1
commit adcc8e8334
1 file changed
+11 -2
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src/coap_address.c
+11 -2
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@@ -218,9 +218,18 @@ coap_is_bcast(const coap_address_t *a) {
while (ife && bcst_cnt < COAP_BCST_CNT) {
if (ife->ifa_addr && ife->ifa_addr->sa_family == AF_INET &&
ife->ifa_flags & IFF_BROADCAST) {
b_ipv4[bcst_cnt].s_addr = ((struct sockaddr_in *)ife->ifa_broadaddr)->sin_addr.s_addr;
if (b_ipv4[bcst_cnt].s_addr != ipv4.s_addr)
struct in_addr netmask;
/*
* Sometimes the broadcast IP is set to the IP address, even though
* netmask is not set to 0xffffffff, so unsafe to use ifa_broadaddr.
*/
netmask.s_addr = ((struct sockaddr_in *)ife->ifa_netmask)->sin_addr.s_addr;
if (netmask.s_addr != 0xffffffff) {
b_ipv4[bcst_cnt].s_addr = ((struct sockaddr_in *)ife->ifa_addr)->sin_addr.s_addr |
~netmask.s_addr;
bcst_cnt++;
}
}
ife = ife->ifa_next;
}