In UI_OpenSSL's open(), generate an error on unknown errno

TTY_get() sometimes surprises us with new errno values to determine if
we have a controling terminal or not.  This generated error is a
helpful tool to figure out that this was what happened and what the
unknown value is.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2043)

crypto/err/err.c

@@ -52,6 +52,7 @@ static ERR_STRING_DATA ERR_str_libraries[] = {
     {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
     {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
     {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
+    {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
     {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
     {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
     {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},

crypto/ui/ui_err.c

@@ -21,6 +21,7 @@
 static ERR_STRING_DATA UI_str_functs[] = {
     {ERR_FUNC(UI_F_GENERAL_ALLOCATE_BOOLEAN), "general_allocate_boolean"},
     {ERR_FUNC(UI_F_GENERAL_ALLOCATE_PROMPT), "general_allocate_prompt"},
+    {ERR_FUNC(UI_F_OPEN_CONSOLE), "open_console"},
     {ERR_FUNC(UI_F_UI_CREATE_METHOD), "UI_create_method"},
     {ERR_FUNC(UI_F_UI_CTRL), "UI_ctrl"},
     {ERR_FUNC(UI_F_UI_DUP_ERROR_STRING), "UI_dup_error_string"},
@@ -45,6 +46,8 @@ static ERR_STRING_DATA UI_str_reasons[] = {
     {ERR_REASON(UI_R_RESULT_TOO_LARGE), "result too large"},
     {ERR_REASON(UI_R_RESULT_TOO_SMALL), "result too small"},
     {ERR_REASON(UI_R_UNKNOWN_CONTROL_COMMAND), "unknown control command"},
+    {ERR_REASON(UI_R_UNKNOWN_TTYGET_ERRNO_VALUE),
+     "unknown ttyget errno value"},
     {0, NULL}
 };
 

crypto/ui/ui_openssl.c

@@ -8,6 +8,7 @@
  */
 
 #include <openssl/e_os2.h>
+#include <openssl/err.h>
 
 /*
  * need for #define _POSIX_C_SOURCE arises whenever you pass -ansi to gcc
@@ -428,8 +429,15 @@ static int open_console(UI *ui)
             is_a_tty = 0;
         else
 # endif
+            {
+                char tmp_num[10];
+                BIO_snprintf(tmp_num, sizeof(tmp_num) - 1, "%d", errno);
+                UIerr(UI_F_OPEN_CONSOLE, UI_R_UNKNOWN_TTYGET_ERRNO_VALUE);
+                ERR_add_error_data(2, "errno=", tmp_num);
+
                 return 0;
             }
+    }
 #endif
 #ifdef OPENSSL_SYS_VMS
     status = sys$assign(&terminal, &channel, 0, 0);

include/openssl/ui.h

@@ -341,6 +341,7 @@ int ERR_load_UI_strings(void);
 /* Function codes. */
 # define UI_F_GENERAL_ALLOCATE_BOOLEAN                    108
 # define UI_F_GENERAL_ALLOCATE_PROMPT                     109
+# define UI_F_OPEN_CONSOLE                                114
 # define UI_F_UI_CREATE_METHOD                            112
 # define UI_F_UI_CTRL                                     111
 # define UI_F_UI_DUP_ERROR_STRING                         101
@@ -362,6 +363,7 @@ int ERR_load_UI_strings(void);
 # define UI_R_RESULT_TOO_LARGE                            100
 # define UI_R_RESULT_TOO_SMALL                            101
 # define UI_R_UNKNOWN_CONTROL_COMMAND                     106
+# define UI_R_UNKNOWN_TTYGET_ERRNO_VALUE                  108
 
 #  ifdef  __cplusplus
 }