/* handle data received from one of qrexec_client processes */
void handle_message_from_client(int fd)
{
struct server_header s_hdr;
char buf[MAX_DATA_CHUNK];
int len, ret;
if (clients[fd].state == CLIENT_CMDLINE) {
handle_cmdline_message_from_client(fd);
return;
}
// We have already passed cmdline from client.
// Now the client passes us raw data from its stdin.
len = buffer_space_vchan_ext();
if (len <= sizeof s_hdr)
return;
/* Read at most the amount of data that we have room for in vchan */
ret = read(fd, buf, len - sizeof(s_hdr));
if (ret < 0) {
perror("read client");
terminate_client_and_flush_data(fd);
return;
}
s_hdr.client_id = fd;
s_hdr.len = ret;
s_hdr.type = MSG_SERVER_TO_AGENT_INPUT;
write_all_vchan_ext(&s_hdr, sizeof(s_hdr));
write_all_vchan_ext(buf, ret);
if (ret == 0) // EOF - so don't select() on this client
clients[fd].state |= CLIENT_DONT_READ;
}
/* handle data received from one of qrexec_client processes */
static void handle_message_from_client(int fd)
{
char buf[MAX_DATA_CHUNK];
switch (clients[fd].state) {
case CLIENT_HELLO:
handle_client_hello(fd);
return;
case CLIENT_CMDLINE:
handle_cmdline_message_from_client(fd);
return;
case CLIENT_RUNNING:
// expected EOF
if (read(fd, buf, sizeof(buf)) != 0) {
fprintf(stderr, "Unexpected data received from client %d\n", fd);
}
terminate_client(fd);
return;
default:
fprintf(stderr, "Invalid client state %d\n", clients[fd].state);
exit(1);
}
}