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/*
* WTSSendMessage() command line tool
*
* Home page of code is: https://www.smartmontools.org
*
* Copyright (C) 2012-19 Christian Franke
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#define WINVER 0x0501
#define _WIN32_WINNT WINVER
char svnid[] = "$Id: wtssendmsg.c 4941 2019-08-08 18:56:36Z chrfranke $";
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <wtsapi32.h>
static int usage()
{
printf("wtssendmsg $Revision: 4941 $ - Display a message box on client desktops\n"
"Copyright (C) 2012-19 Christian Franke, www.smartmontools.org\n\n"
"Usage: wtssendmsg [-cas] [-t TIMEOUT] [-w 0..5] [-v] [\"Caption\"] \"Message\"|-\n"
" wtssendmsg -v\n\n"
" -c Console session [default]\n"
" -a Active sessions\n"
" -s Connected sessions\n"
" -t Remove message box after TIMEOUT seconds\n"
" -w Select buttons and wait for response or timeout\n"
" -v List sessions\n"
);
return 1;
}
static int getnum(const char * s)
{
char * endp;
int n = strtol(s, &endp, 10);
if (*endp)
return -1;
return n;
}
int main(int argc, const char **argv)
{
int mode = 0, timeout = 0, buttons = -1, verbose = 0, i;
for (i = 1; i < argc && argv[i][0] == '-' && argv[i][1]; i++) {
int j;
for (j = 1; argv[i][j]; j++) {
switch (argv[i][j]) {
case 'c': mode = 0; continue;
case 'a': mode = 1; continue;
case 's': mode = 2; continue;
case 't':
if (argv[i][j+1] || ++i >= argc)
return usage();
timeout = getnum(argv[i]);
if (timeout < 0)
return usage();
break;
case 'w':
if (argv[i][j+1] || ++i >= argc)
return usage();
buttons = getnum(argv[i]);
if (!(MB_OK <= buttons && buttons <= MB_RETRYCANCEL)) // 0..5
return usage();
break;
case 'v': verbose = 1; continue;
default: return usage();
}
break;
}
}
const char * message = 0, * caption = "";
char msgbuf[1024];
if (i < argc) {
if (i+1 < argc)
caption = argv[i++];
message = argv[i++];
if (i < argc)
return usage();
if (!strcmp(message, "-")) {
// Read message from stdin
// The message is also written to a Windows event log entry, so
// don't convert '\r\n' to '\n' (the MessageBox works with both)
i = 0;
DWORD size = 0;
do
if (!ReadFile(GetStdHandle(STD_INPUT_HANDLE),
msgbuf+i, sizeof(msgbuf)-1-i, &size, (OVERLAPPED*)0))
break; // May fail with ERROR_BROKEN_PIPE instead of EOF
while (size > 0 && (i += size) < (int)sizeof(msgbuf)-1);
msgbuf[i] = 0;
message = msgbuf;
}
}
else {
if (!verbose)
return usage();
}
// Get session list
WTS_SESSION_INFOA * sessions; DWORD count;
if (!WTSEnumerateSessionsA(WTS_CURRENT_SERVER_HANDLE, 0, 1, &sessions, &count)) {
fprintf(stderr, "WTSEnumerateSessions() failed\n");
return 1;
}
int status = 0;
for (i = 0; i < (int)count; i++) {
if (verbose) {
printf("Session %d (\"%s\", State=%d)%s",
i, sessions[i].pWinStationName, sessions[i].State,
(!message ? "\n" : ": "));
if (!message)
continue; // List sessions only
fflush(stdout);
}
// Check session state
if (!( !strcmpi(sessions[i].pWinStationName, "Console")
|| (mode >= 1 && sessions[i].State == WTSActive)
|| (mode >= 2 && sessions[i].State == WTSConnected))) {
if (verbose)
printf("ignored\n");
continue;
}
// Send Message
DWORD response = ~0;
if (!WTSSendMessageA(WTS_CURRENT_SERVER_HANDLE, sessions[i].SessionId,
(char *)caption, strlen(caption),
(char *)message, strlen(message),
(buttons <= MB_OK ? MB_OK|MB_ICONEXCLAMATION
: buttons|MB_DEFBUTTON2|MB_ICONQUESTION ),
timeout, &response, (buttons >= MB_OK) /*Wait?*/ )) {
status |= 0x01;
if (verbose)
printf("WTSSendMessage() failed with error=%d\n", (int)GetLastError());
else
fprintf(stderr, "Session %d (\"%s\", State=%d): WTSSendMessage() failed with error=%d\n",
i, sessions[i].pWinStationName, sessions[i].State, (int)GetLastError());
continue;
}
if (buttons >= MB_OK) {
switch (response) {
case IDOK:
case IDYES: case IDABORT: status |= 0x02; break;
case IDNO: case IDRETRY: status |= 0x04; break;
case IDCANCEL: case IDIGNORE: status |= 0x08; break;
case IDTIMEOUT: status |= 0x10; break;
default: status |= 0x01; break;
}
if (verbose)
printf("response = %d, status = 0x%02x\n", (int)response, status);
}
else {
// response == IDASYNC
if (verbose)
printf("message sent\n");
}
}
WTSFreeMemory(sessions);
return status;
}
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