More scaffolding for dealing with multiple sudoers files:

o init_parser() now takes a path used to populate the sudoers global
 o the sudoers global is used to print the correct file in yyerror()
 o when switching to a new sudoers file, perserve old file name and line number

parse.c

@@ -96,7 +96,6 @@ extern FILE *yyin, *yyout;
  * Prototypes
  */
 static int has_meta	__P((char *));
-       void init_parser	__P((void));
 
 /*
  * Look up the user in the sudoers file and check to see if they are
@@ -113,7 +112,7 @@ sudoers_lookup(pwflag)
     yyout = stdout;
 
     /* Allocate space for data structures in the parser. */
-    init_parser();
+    init_parser(_PATH_SUDOERS);
 
     /* If pwcheck *could* be "all" or "any", keep more state. */
     if (pwflag > 0)

parse.h

@@ -101,5 +101,6 @@ int hostname_matches	__P((char *, char *, char *));
 int netgr_matches	__P((char *, char *, char *, char *));
 int userpw_matches	__P((char *, char *, struct passwd *));
 int usergr_matches	__P((char *, char *, struct passwd *));
+void init_parser	__P((char *));
 
 #endif /* _SUDO_PARSE_H */

parse.lex

@@ -62,6 +62,7 @@ static const char rcsid[] = "$Sudo$";
 extern YYSTYPE yylval;
 extern int clearaliases;
 int sudolineno = 1;
+char *sudoers;
 static int sawspace = 0;
 static int arg_len = 0;
 static int arg_size = 0;
@@ -69,7 +70,7 @@ static int arg_size = 0;
 static int fill			__P((char *, int));
 static int fill_cmnd		__P((char *, int));
 static int fill_args		__P((char *, int, int));
-static int buffer_frob		__P((const char *));
+static int buffer_frob		__P((char *));
 extern void reset_aliases	__P((void));
 extern void yyerror		__P((const char *));
 
@@ -181,6 +182,7 @@ DEFVAR			[a-z_]+
 
 <INITIAL>^#include[ \t]+.*\n {
 			    char *cp, *ep;
+			    ++sudolineno;
 			    /* pull out path from #include line */
 			    for (cp = yytext + 9; isspace(*cp); cp++)
 				continue;
@@ -505,24 +507,35 @@ fill_args(s, len, addspace)
     return(TRUE);
 }
 
-#define MAX_INCLUDE_DEPTH	128
-int
+struct sudoers_state {
+    YY_BUFFER_STATE bs;
+    char *path;
+    int lineno;
+};
+
+#define MAX_SUDOERS_DEPTH	128
+
+static int
 buffer_frob(path)
-    const char *path;
+    char *path;
 {
     static size_t stacksize, depth;
-    static YY_BUFFER_STATE *bufstack;
+    static struct sudoers_state *state;
     FILE *fp;
 
     if (path != NULL) {
-	/* push */
+	/* push current state */
+	if ((path = strdup(path)) == NULL) {
+	    yyerror("unable to allocate memory");
+	    return(FALSE);
+	}
 	if (depth >= stacksize) {
-	    if (depth > MAX_INCLUDE_DEPTH) {
+	    if (depth > MAX_SUDOERS_DEPTH) {
 		yyerror("too many levels of includes");
 		return(FALSE);
 	    }
 	    stacksize += 16;
-	    if ((bufstack = realloc(bufstack, stacksize)) == NULL) {
+	    if ((state = realloc(state, sizeof(state) * stacksize)) == NULL) {
 		yyerror("unable to allocate memory");
 		return(FALSE);
 	    }
@@ -531,15 +544,24 @@ buffer_frob(path)
 	    yyerror(path);
 	    return(FALSE);
 	}
-	bufstack[depth++] = YY_CURRENT_BUFFER;
+	state[depth].bs = YY_CURRENT_BUFFER;
+	state[depth].path = sudoers;
+	state[depth].lineno = sudolineno;
+	depth++;
+	sudolineno = 1;
+	sudoers = path;
 	yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
     } else {
 	/* pop */
 	if (depth == 0)
 	    return(FALSE);
+	depth--;
 	fclose(YY_CURRENT_BUFFER->yy_input_file);
 	yy_delete_buffer(YY_CURRENT_BUFFER);
-	yy_switch_to_buffer(bufstack[--depth]);
+	yy_switch_to_buffer(state[depth].bs);
+	free(sudoers);
+	sudoers = state[depth].path;
+	sudolineno = state[depth].lineno;
     }
     return(TRUE);
 }

parse.yacc

@@ -78,6 +78,7 @@ static const char rcsid[] = "$Sudo$";
  * Globals
  */
 extern int sudolineno, parse_error;
+extern char *sudoers;
 int errorlineno = -1;
 int clearaliases = TRUE;
 int printmatches = FALSE;
@@ -198,7 +199,6 @@ static void expand_ga_list	__P((void));
 static void expand_match_list	__P((void));
 static aliasinfo *find_alias	__P((char *, int));
 static int  more_aliases	__P((void));
-       void init_parser		__P((void));
        void yyerror		__P((const char *));
 
 void
@@ -210,7 +210,7 @@ yyerror(s)
 	errorlineno = sudolineno ? sudolineno - 1 : 0;
     if (s && !quiet) {
 #ifndef TRACELEXER
-	(void) fprintf(stderr, ">>> sudoers file: %s, line %d <<<\n", s,
+	(void) fprintf(stderr, ">>> %s: %s, line %d <<<\n", sudoers, s,
 	    sudolineno ? sudolineno - 1 : 0);
 #else
 	(void) fprintf(stderr, "<*> ");
@@ -1250,7 +1250,7 @@ expand_match_list()
  * for various data structures.
  */
 void
-init_parser()
+init_parser(char *path)
 {
 
     /* Free up old data structures if we run the parser more than once. */
@@ -1262,6 +1262,7 @@ init_parser()
 	used_runas = FALSE;
 	errorlineno = -1;
 	sudolineno = 1;
+	free(sudoers);
     }
 
     /* Allocate space for the matching stack. */
@@ -1271,4 +1272,6 @@ init_parser()
     /* Allocate space for the match list (for `sudo -l'). */
     if (printmatches == TRUE)
 	expand_match_list();
+
+    sudoers = estrdup(path);
 }