id -R routing domain

[Ted Unangst]

make it easy to find out which rdomain a shell is in. id -R.

one small problem is that pledge doesn't permit getrtable().

Index: id.1
===================================================================
RCS file: /cvs/src/usr.bin/id/id.1,v
retrieving revision 1.18
diff -u -p -r1.18 id.1
--- id.1        19 May 2015 16:03:19 -0000      1.18
+++ id.1        30 May 2017 14:54:27 -0000
@@ -57,6 +57,8 @@
 .Nm id
 .Fl u Op Fl nr
 .Op Ar user
+.Nm id
+.Fl R
 .Sh DESCRIPTION
 The
 .Nm
@@ -115,6 +117,8 @@ If there is a login class specified for 
 database, it is displayed, preceded by the keyword
 .Dq class .
 Each display is on a separate line.
+.It Fl R
+Display the routing table of the current process.
 .It Fl r
 Display the real ID for the
 .Fl g
@@ -137,7 +141,7 @@ utility is compliant with the
 specification.
 .Pp
 The flags
-.Op Fl cp
+.Op Fl cpR
 are extensions to that specification.
 .Sh HISTORY
 The
Index: id.c
===================================================================
RCS file: /cvs/src/usr.bin/id/id.c,v
retrieving revision 1.26
diff -u -p -r1.26 id.c
--- id.c        9 Oct 2015 01:37:07 -0000       1.26
+++ id.c        30 May 2017 14:52:52 -0000
@@ -29,6 +29,9 @@
  * SUCH DAMAGE.
  */
 
+#include <sys/types.h>
+#include <sys/socket.h> /* because getrtable() lives here */
+
 #include <err.h>
 #include <errno.h>
 #include <grp.h>
@@ -53,15 +56,15 @@ main(int argc, char *argv[])
 {
        struct group *gr;
        struct passwd *pw;
-       int ch, cflag, Gflag, gflag, nflag, pflag, rflag, uflag;
+       int ch, cflag, Gflag, gflag, nflag, pflag, Rflag, rflag, uflag;
        uid_t uid;
        gid_t gid;
        const char *opts;
 
-       if (pledge("stdio getpw", NULL) == -1)
+       if (0 && pledge("stdio getpw", NULL) == -1)
                err(1, "pledge");
 
-       cflag = Gflag = gflag = nflag = pflag = rflag = uflag = 0;
+       cflag = Gflag = gflag = nflag = pflag = Rflag = rflag = uflag = 0;
 
        if (strcmp(getprogname(), "groups") == 0) {
                Gflag = 1;
@@ -76,7 +79,7 @@ main(int argc, char *argv[])
                if (argc > 1)
                        usage();
        } else
-               opts = "cGgnpru";
+               opts = "cGgnpRru";
 
        while ((ch = getopt(argc, argv, opts)) != -1)
                switch(ch) {
@@ -95,6 +98,9 @@ main(int argc, char *argv[])
                case 'p':
                        pflag = 1;
                        break;
+               case 'R':
+                       Rflag = 1;
+                       break;
                case 'r':
                        rflag = 1;
                        break;
@@ -108,7 +114,7 @@ main(int argc, char *argv[])
        argc -= optind;
        argv += optind;
 
-       switch (cflag + Gflag + gflag + pflag + uflag) {
+       switch (cflag + Gflag + gflag + pflag + Rflag + uflag) {
        case 1:
                break;
        case 0:
@@ -121,6 +127,11 @@ main(int argc, char *argv[])
 
        if (strcmp(opts, "") != 0 && argc > 1)
                usage();
+
+       if (Rflag) {
+               printf("%d\n", getrtable());
+               exit(0);
+       }
 
        pw = *argv ? who(*argv) : NULL;