- Add further functionality to check for invalid characters

- Remove keyword 'continue' for more indepth error reporting
  on each line
- WARNS 6 Clean

Submitted by:	Liam J. Foy <liamfoy@dragonflybsd.org>
MFC after:	    1 week

usr.sbin/chkgrp/chkgrp.8

@@ -44,7 +44,8 @@ errors.
 Specifically, it checks that every non-blank, non-comment
 entry is composed of four colon-separated fields, that none of them
 contains whitespace, and that the third field (the group ID) is
-numeric.
+numeric. It will also check for invalid characters in the group names
+and group members.
 .Sh FILES
 .Bl -tag -width /etc/group -compact
 .It Pa /etc/group
@@ -64,8 +65,6 @@ For each error found,
 .Nm
 will print an error message containing the name of the file being
 scanned and the line number on which the error was found.
-Otherwise no
-output is produced.
 .Sh SEE ALSO
 .Xr getgrent 3 ,
 .Xr group 5
@@ -79,6 +78,8 @@ The
 .Nm
 utility and this manual page were written by
 .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
+.Pp
+Further functionality was added by
+.An Liam J. Foy Aq liamfoy@dragonflybsd.org .
 .Sh BUGS
-Should check fields more thoroughly for allowed/disallowed
+Should check the range of the group ID.
-characters, and the range of the group ID.

usr.sbin/chkgrp/chkgrp.c

@@ -50,7 +50,7 @@ main(int argc, char *argv[])
     size_t len;
     int n = 0, k, e = 0;
     char *line, *f[4], *p;
-    const char *gfn;
+    const char *cp, *gfn;
     FILE *gf;
 
     /* check arguments */
@@ -104,30 +104,46 @@ main(int argc, char *argv[])
 		break;
 	    line[i++] = 0;
 	}
+
+	for (cp = f[0] ; *cp ; cp++) {
+	    if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-') {
+		warnx("%s: line %d: '%c' invalid character", gfn, n, *cp);
+		e++;
+	    }
+	}
+
+	for (cp = f[3] ; *cp ; cp++) {
+	    if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-' &&
+			*cp != ',') {
+		warnx("%s: line %d: '%c' invalid character", gfn, n, *cp);
+		e++;
+	    }
+	}
+
 	if (k < 4) {
 	    warnx("%s: line %d: missing field(s)", gfn, n);
 	    e++;
-	    continue;
 	}
 
 	/* check if fourth field ended with a colon */
 	if (i < len) {
 	    warnx("%s: line %d: too many fields", gfn, n);
 	    e++;
-	    continue;
 	}
 	
 	/* check that none of the fields contain whitespace */
-	for (k = 0; k < 4; k++)
+	for (k = 0; k < 4; k++) {
-	    if (strcspn(f[k], " \t") != strlen(f[k]))
+	    if (strcspn(f[k], " \t") != strlen(f[k])) {
 		warnx("%s: line %d: field %d contains whitespace",
 		      gfn, n, k+1);
+		e++;
+	    }
+	}
 
 	/* check that the GID is numeric */
 	if (strspn(f[2], "0123456789") != strlen(f[2])) {
 	    warnx("%s: line %d: GID is not numeric", gfn, n);
 	    e++;
-	    continue;
 	}
 	
 #if 0
@@ -142,5 +158,7 @@ main(int argc, char *argv[])
 
     /* done */
     fclose(gf);
+    if (e == 0)
+	printf("%s is fine\n", gfn);
     exit(e ? EX_DATAERR : EX_OK);
 }