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GUACAMOLE-513: Merge socket calls and handle IP family determination correctly.

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This commit is contained in:
Nick Couchman 2020-06-16 16:48:51 -04:00
parent ec305903d0
commit b0bcb30346
1 changed files with 33 additions and 21 deletions
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54
src/libguac/wol.c
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@ -84,28 +84,47 @@ static ssize_t __guac_wol_send_packet(const char* broadcast_addr,
/* Determine the IP version, starting with IPv4. */
wol_dest.sin_port = htons(GUAC_WOL_PORT);
wol_dest.sin_family = AF_INET;
if (inet_pton(AF_INET, broadcast_addr, &(wol_dest.sin_addr)) == 0) {
int retval = inet_pton(wol_dest.sin_family, broadcast_addr, &(wol_dest.sin_addr));
/* If return value is less than zero, the address doesn't match any known family. */
if (retval < 0) {
guac_error = GUAC_STATUS_SEE_ERRNO;
guac_error_message = "Unknown broadcast or multicast address type specified for Wake-on-LAN";
return 0;
}
/* If return value is zero, address doesn't match the IPv4, so try IPv6. */
else if (retval == 0) {
wol_dest.sin_family = AF_INET6;
if (inet_pton(AF_INET6, broadcast_addr, &(wol_dest.sin_addr)) == 0) {
guac_error = GUAC_STATUS_SEE_ERRNO;
guac_error_message = "Wake-on-LAN address does not appear to be IPv4 or IPv6";
retval = inet_pton(wol_dest.sin_family, broadcast_addr, &(wol_dest.sin_addr));
/* IPv6 didn't work, either, so bail out. */
if (retval == 0) {
guac_error = GUAC_STATUS_INVALID_ARGUMENT;
guac_error_message = "Invalid broadcast or multicast address specified for Wake-on-LAN";
return 0;
}
}
/* Set up the socket */
wol_socket = socket(wol_dest.sin_family, SOCK_DGRAM, 0);
/* If socket open fails, bail out. */
if (wol_socket < 0) {
guac_error = GUAC_STATUS_SEE_ERRNO;
guac_error_message = "Failed to open socket to send Wake-on-LAN packet";
return 0;
}
/* Set up socket for IPv4 broadcast. */
if (wol_dest.sin_family == AF_INET) {
int wol_bcast = 1;
wol_socket = socket(AF_INET, SOCK_DGRAM, 0);
/* If opening a socket fails, bail out. */
if (wol_socket < 0) {
guac_error = GUAC_STATUS_SEE_ERRNO;
guac_error_message = "Failed to open IPv4 Wake-on-LAN socket";
return 0;
}
/* For configuring socket broadcast */
int wol_bcast = 1;
/* Attempt to set broadcast; exit with error if this fails. */
/* Attempt to set IPv4 broadcast; exit with error if this fails. */
if (setsockopt(wol_socket, SOL_SOCKET, SO_BROADCAST, &wol_bcast,
sizeof(wol_bcast)) < 0) {
close(wol_socket);
@ -117,18 +136,11 @@ static ssize_t __guac_wol_send_packet(const char* broadcast_addr,
/* Set up socket for IPv6 multicast. */
else {
wol_socket = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
/* If opening the socket fails, bail out. */
if (wol_socket < 0) {
guac_error = GUAC_STATUS_SEE_ERRNO;
guac_error_message = "Failed to open IPv6 Wake-on-LAN socket";
return 0;
}
/* Stick to a single hop for now. */
int hops = 1;
/* Attempt to set IPv6 multicast; exit with error if this fails. */
if (setsockopt(wol_socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops,
sizeof(hops)) < 0) {
close(wol_socket);