diff options
Diffstat (limited to 'src/mds-vt.c')
| -rw-r--r-- | src/mds-vt.c | 137 |
1 files changed, 136 insertions, 1 deletions
diff --git a/src/mds-vt.c b/src/mds-vt.c index aa82d34..8784058 100644 --- a/src/mds-vt.c +++ b/src/mds-vt.c @@ -375,7 +375,7 @@ int master_loop(void) } if (r = mds_message_read(&received, socket_fd), r == 0) - if (r = 0, r == 0) /* FIXME */ + if (r = handle_message(), r == 0) continue; if (r == -2) @@ -414,6 +414,141 @@ int master_loop(void) /** + * Handle the received message + * + * @return Zero on success, -1 on error + */ +int handle_message(void) +{ + /* Fetch message headers. */ + + const char* recv_client_id = "0:0"; + const char* recv_message_id = NULL; + const char* recv_graphical = "neither"; + const char* recv_exclusive = "neither"; + const char* recv_command = NULL; + size_t i; + +#define __get_header(storage, header) \ + (startswith(received.headers[i], header)) \ + storage = received.headers[i] + strlen(header) + + for (i = 0; i < received.header_count; i++) + { + if __get_header(recv_client_id, "Client ID: "); + else if __get_header(recv_message_id, "Message ID: "); + else if __get_header(recv_graphical, "Graphical: "); + else if __get_header(recv_exclusive, "Exclusive: "); + else if __get_header(recv_command, "Command: "); + } + +#undef __get_header + + + /* Validate headers. */ + + if (recv_message_id == NULL) + { + eprint("received message with ID, ignoring, master server is misbehaving."); + return 0; + } + + if (strequals(recv_client_id, "0:0")) + { + eprint("received information request from an anonymous client, ignoring."); + return 0; + } + + if (strlen(recv_client_id) > 21) + { + eprint("received invalid client ID, ignoring."); + return 0; + } + if (strlen(recv_message_id) > 10) + { + eprint("received invalid message ID, ignoring."); + return 0; + } + + + /* Take appropriate action. */ + + if (strequals(recv_command, "get-vt")) + return handle_get_vt(recv_client_id, recv_message_id); + + if (strequals(recv_command, "configure-vt")) + return handle_configure_vt(recv_client_id, recv_message_id, recv_graphical, recv_exclusive); + + return 0; +} + + +/** + * Handle a received `Command: get-vt` message + * + * @param client The value of the header `Client ID` in the received message + * @param message The value of the header `Message ID` in the received message + * @return Zero on success, -1 on error + */ +int handle_get_vt(const char* client, const char* message) +{ + char buf[57 + 44 + 3 * sizeof(int)]; + int active = vt_get_active(); + int r; + + sprintf(buf, + "To: %s\n" + "In response to: %s\n" + "Message ID: %" PRIu32 "\n" + "VT index: %i\n" + "Active: %s\n" + "\n", + client, message, message_id, display_vt, + active == display_vt ? "yes" : "no"); + + message_id = message_id == UINT32_MAX ? 0 : (message_id + 1); + + r = full_send(buf, strlen(buf)); + return ((active < 0) || r) ? -1 : 0; +} + + +/** + * Handle a received `Command: configure-vt` message + * + * @param client The value of the header `Client ID` in the received message + * @param message The value of the header `Message ID` in the received message + * @param graphical The value of the header `Graphical` in the received message + * @param exclusive The value of the header `Exclusive` in the received message + * @return Zero on success, -1 on error + */ +int handle_configure_vt(const char* client, const char* message, const char* graphical, const char* exclusive) +{ + char buf[60 + 41 + 3 * sizeof(int)]; + int r = 0; + + if (strequals(exclusive, "yes") || strequals(exclusive, "no")) + r |= vt_set_graphical(display_tty_fd, strequals(exclusive, "yes")); + + if (strequals(graphical, "yes") || strequals(graphical, "no")) + r |= vt_set_exclusive(display_tty_fd, strequals(graphical, "yes")); + + sprintf(buf, + "Command: error\n" + "To: %s\n" + "In response to: %s\n" + "Message ID: %" PRIu32 "\n" + "Error: %i\n" + "\n", + client, message, message_id, r); + + message_id = message_id == UINT32_MAX ? 0 : (message_id + 1); + + return -!!full_send(buf, strlen(buf)); +} + + +/** * This function is called when the kernel wants * to switch foreground virtual terminal * |