1 files changed, 45 insertions, 0 deletions
diff --git a/src/shutdown/hpr_confirm_hostname.c b/src/shutdown/hpr_confirm_hostname.c
new file mode 100644
index 0000000..00b3de7
--- /dev/null
+++ b/src/shutdown/hpr_confirm_hostname.c
@@ -0,0 +1,45 @@
+/* ISC license. */
+
+#include <string.h>
+#include <strings.h>
+#include <unistd.h>
+#include <termios.h>
+#include <errno.h>
+#include <limits.h>
+
+#include <skalibs/allreadwrite.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/strerr2.h>
+
+#include "hpr.h"
+
+#define PROMPT "Please enter the machine's hostname: "
+
+void hpr_confirm_hostname (void)
+{
+  char name[HOST_NAME_MAX + 1] ;
+  char buf[HOST_NAME_MAX + 1] ;
+  char *p ;
+  ssize_t r ;
+  if (!isatty(0) || !isatty(1))
+    strerr_diefu1sys(100, "ask hostname confirmation") ;
+  if (gethostname(name, HOST_NAME_MAX) < 0)
+    strerr_diefu1sys(111, "get host name") ;
+  name[HOST_NAME_MAX] = 0 ;
+  p = strchr(name, '.') ;
+  if (p) *p = 0 ;
+  if (allwrite(1, PROMPT, sizeof(PROMPT)-1) < 0)
+    strerr_diefu1sys(111, "write to stdout") ;
+  if (tcdrain(1) < 0)
+    strerr_diefu1sys(111, "tcdrain stdout") ;
+  if (tcflush(0, TCIFLUSH) < 0)
+    strerr_diefu1sys(111, "empty stdin buffer") ;
+  r = fd_read(0, buf, HOST_NAME_MAX) ;
+  if (!r) errno = EPIPE ;
+  if (r <= 0) strerr_diefu1sys(111, "read from stdin") ;
+  buf[byte_chr(buf, r, '\n')] = 0 ;
+  p = strchr(buf, '.') ;
+  if (p) *p = 0 ;
+  if (strcasecmp(name, buf))
+    strerr_dief2x(1, "hostname mismatch: expecting ", name) ;
+}