Add support for the arbitrary named jail parameters used by jail_set(2)

and jail_get(2).  Jail(8) can now create jails using a "name=value"
format instead of just specifying a limited set of fixed parameters; it
can also modify parameters of existing jails.  Jls(8) can display all
parameters of jails, or a specified set of parameters.  The available
parameters are gathered from the kernel, and not hard-coded into these
programs.

Small patches on killall(1) and jexec(8) to support jail names with
jail_get(2).

Approved by:	bz (mentor)

2 files changed, 22 insertions, 11 deletions

diff --git a/usr.bin/killall/killall.1 b/usr.bin/killall/killall.1
index 816ea81..632c066 100644
--- a/usr.bin/killall/killall.1
+++ b/usr.bin/killall/killall.1
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 9, 2007
+.Dd May 27, 2009
 .Os
 .Dt KILLALL 1
 .Sh NAME
@@ -34,7 +34,7 @@
 .Nm
 .Op Fl delmsvz
 .Op Fl help
-.Op Fl j Ar jid
+.Op Fl j Ar jail
 .Op Fl u Ar user
 .Op Fl t Ar tty
 .Op Fl c Ar procname
@@ -91,9 +91,9 @@ The signal may be specified either as a name
 (with or without a leading
 .Dq Li SIG ) ,
 or numerically.
-.It Fl j Ar jid
-Kill processes in the jail specified by
-.Ar jid .
+.It Fl j Ar jail
+Kill processes in the specified
+.Ar jail .
 .It Fl u Ar user
 Limit potentially matching processes to those belonging to
 the specified
diff --git a/usr.bin/killall/killall.c b/usr.bin/killall/killall.c
index 8e84572..ffb6ee4 100644
--- a/usr.bin/killall/killall.c
+++ b/usr.bin/killall/killall.c
@@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/jail.h>
 #include <sys/stat.h>
+#include <sys/uio.h>
 #include <sys/user.h>
 #include <sys/sysctl.h>
 #include <fcntl.h>
@@ -51,7 +52,7 @@ static void __dead2
 usage(void)
 {
 
-	fprintf(stderr, "usage: killall [-delmsvz] [-help] [-j jid]\n");
+	fprintf(stderr, "usage: killall [-delmsvz] [-help] [-j jail]\n");
 	fprintf(stderr,
 	    "               [-u user] [-t tty] [-c cmd] [-SIGNAL] [cmd]...\n");
 	fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
@@ -100,6 +101,7 @@ nosig(char *name)
 int
 main(int ac, char **av)
 {
+	struct iovec	jparams[2];
 	struct kinfo_proc *procs = NULL, *newprocs;
 	struct stat	sb;
 	struct passwd	*pw;
@@ -159,12 +161,21 @@ main(int ac, char **av)
 				}
 				jflag++;
 				if (*av == NULL)
-				    	errx(1, "must specify jid");
-				jid = strtol(*av, &ep, 10);
-				if (!*av || *ep)
-					errx(1, "illegal jid: %s", *av);
+				    	errx(1, "must specify jail");
+				jid = strtoul(*av, &ep, 10);
+				if (!**av || *ep) {
+					*(const void **)&jparams[0].iov_base =
+					    "name";
+					jparams[0].iov_len = sizeof("name");
+					jparams[1].iov_base = *av;
+					jparams[1].iov_len = strlen(*av) + 1;
+					jid = jail_get(jparams, 2, 0);
+					if (jid < 0)
+						errx(1, "unknown jail: %s",
+						    *av);
+				}
 				if (jail_attach(jid) == -1)
-					err(1, "jail_attach(): %d", jid);
+					err(1, "jail_attach(%d)", jid);
 				break;
 			case 'u':
 				++*av;