necouchman commented on code in PR #643:
URL: https://github.com/apache/guacamole-server/pull/643#discussion_r2985039825
##########
src/libguac/tcp.c:
##########
@@ -97,20 +97,33 @@ int guac_tcp_connect(const char* hostname, const char*
port, const int timeout)
continue;
}
- /* Structure that stores our timeout setting. */
struct timeval tv;
tv.tv_sec = timeout;
tv.tv_usec = 0;
/* Connect and wait for timeout */
if ((retval = connect(fd, current_address->ai_addr,
current_address->ai_addrlen)) < 0) {
- if (errno == EINPROGRESS) {
- /* Set up timeout. */
+ /* If connect() is in progress (EINPROGRESS) or interrupted by a
signal
+ * (EINTR), wait for the socket to become writable and check
SO_ERROR. */
+ if (errno == EINPROGRESS || errno == EINTR) {
+
+ /* Prevent overflowing fd_set. */
+ if (fd >= FD_SETSIZE) {
+ guac_error = GUAC_STATUS_INVALID_ARGUMENT;
+ guac_error_message = "File descriptor exceeds FD_SETSIZE.";
+ close(fd);
+ fd = -1;
+ continue;
+ }
+
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
-
- retval = select(fd + 1, NULL, &fdset, NULL, &tv);
+
+ /* Linux (kernel/glibc verified): select() does not modify
fd_set on -1,
+ and updates struct timeval to reflect elapsed time on
EINTR, so
+ neither needs reinitialization on retry. */
Review Comment:
This line appears to have a couple of tabs instead of spaces.
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