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PY-57058: Skip interfaces with NULL addresses (wslproxy)

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``ifaddrs->ifa_addr`` may be NULL according to ``getifaddr(3)``.

This is a case for the tailscale VPN at least

GitOrigin-RevId: 134cd2bcf03a01b6c52536e23b86a1135450d67b
This commit is contained in:
Ilya.Kazakevich
2022-11-02 16:42:46 +01:00
committed by intellij-monorepo-bot
parent 94c6d06f97
commit 65a8ccb6c5
2 changed files with 9 additions and 4 deletions
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bin/win/amd64/wslproxy
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13
native/WslTools/wslproxy.c
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@@ -28,7 +28,7 @@
static in_addr_t g_egress_ip;
// Bind to eth0 only
static in_addr_t jb_get_wsl_public_ip() {
static in_addr_t jb_get_wsl_public_ip(void) {
struct ifaddrs *ifaddrs_p_base;
if (getifaddrs(&ifaddrs_p_base) != 0) {
perror("getifaddrs failed");
@@ -36,11 +36,16 @@ static in_addr_t jb_get_wsl_public_ip() {
}
for (struct ifaddrs *ifaddrs_p = ifaddrs_p_base; ifaddrs_p != NULL; ifaddrs_p = ifaddrs_p->ifa_next) {
// Search for interface and ipv4
if ((ifaddrs_p->ifa_addr->sa_family != AF_INET) ||
const struct sockaddr *sockaddr_p = ifaddrs_p->ifa_addr;
if (sockaddr_p == NULL) {
continue;
}
if ((sockaddr_p->sa_family != AF_INET) ||
((strcmp(ifaddrs_p->ifa_name, JB_EGRESS_INTERFACE) != 0))) {
continue;
}
const struct sockaddr_in *in_addr = (struct sockaddr_in *) ifaddrs_p->ifa_addr;
const struct sockaddr_in *in_addr = (struct sockaddr_in *) sockaddr_p;
const in_addr_t result = in_addr->sin_addr.s_addr;
freeifaddrs(ifaddrs_p_base);
return result;
@@ -181,7 +186,7 @@ _Noreturn static void *jb_listen_ingress(const int *p_ingress_srv_sock_fd) {
static int g_ingress_srv_sock_fd;
int main() {
int main(void) {
g_egress_ip = jb_get_wsl_public_ip();
// IP address