From fdb4bb1b8935b02642bc8394223c0a029a8d29b9 Mon Sep 17 00:00:00 2001
From: Brian Somers <brian@FreeBSD.org>
Date: Tue, 16 Nov 1999 21:57:34 +0000
Subject: [PATCH] Use modfind() to check if a kld is already loaded.

Submitted mostly by: green
---
 usr.sbin/ppp/bundle.c | 18 +++++++-----------
 usr.sbin/ppp/ether.c  | 16 +++++-----------
 usr.sbin/ppp/id.c     |  2 +-
 usr.sbin/ppp/id.h     |  2 +-
 4 files changed, 14 insertions(+), 24 deletions(-)

diff --git a/usr.sbin/ppp/bundle.c b/usr.sbin/ppp/bundle.c
index 7f47e05e3842..dcc07f267603 100644
--- a/usr.sbin/ppp/bundle.c
+++ b/usr.sbin/ppp/bundle.c
@@ -47,6 +47,7 @@
 #include <sys/wait.h>
 #if defined(__FreeBSD__) && !defined(NOKLDLOAD)
 #include <sys/linker.h>
+#include <sys/module.h>
 #endif
 #include <termios.h>
 #include <unistd.h>
@@ -607,7 +608,7 @@ bundle_Create(const char *prefix, int type, int unit, const char **argv)
   static struct bundle bundle;		/* there can be only one */
   int enoentcount, err, minunit, maxunit;
   const char *ifname;
-#ifdef KLDSYM_LOOKUP
+#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
   int kldtried;
 #endif
 #if defined(TUNSIFMODE) || defined(TUNSLMODE)
@@ -628,7 +629,7 @@ bundle_Create(const char *prefix, int type, int unit, const char **argv)
   }
   err = ENOENT;
   enoentcount = 0;
-#ifdef KLDSYM_LOOKUP
+#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
   kldtried = 0;
 #endif
   for (bundle.unit = minunit; bundle.unit != maxunit; bundle.unit++) {
@@ -638,18 +639,13 @@ bundle_Create(const char *prefix, int type, int unit, const char **argv)
     if (bundle.dev.fd >= 0)
       break;
     else if (errno == ENXIO) {
-#ifdef KLDSYM_LOOKUP
+#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
       if (bundle.unit == minunit && !kldtried++) {
         /*
-         * XXX:  For some odd reason, FreeBSD (right now) allows if_tun.ko to
-         *       load even when the kernel contains the tun device. This lookup
-         *       should go away when this is fixed, leaving just the kldload().
-         * Note also that kldsym() finds static symbols...
+	 * Attempt to load the tunnel interface KLD if it isn't loaded
+	 * already.
          */
-        char devsw[] = "tun_cdevsw";
-        struct kld_sym_lookup ksl = { sizeof ksl, devsw, 0, 0 };
-
-        if (kldsym(0, KLDSYM_LOOKUP, &ksl) == -1) {
+        if (modfind("if_tun") == -1) {
           if (ID0kldload("if_tun") != -1) {
             bundle.unit--;
             continue;
diff --git a/usr.sbin/ppp/ether.c b/usr.sbin/ppp/ether.c
index da20f9f40832..52ae0835ee52 100644
--- a/usr.sbin/ppp/ether.c
+++ b/usr.sbin/ppp/ether.c
@@ -49,6 +49,7 @@
 #include <sys/fcntl.h>
 #if defined(__FreeBSD__) && !defined(NOKLDLOAD)
 #include <sys/linker.h>
+#include <sys/module.h>
 #endif
 #include <sys/uio.h>
 #include <termios.h>
@@ -409,22 +410,15 @@ ether_Create(struct physical *p)
     int ifacelen, providerlen, oldflag;
     char connectpath[sizeof dev->hook + 2];	/* .:<hook> */
 
-#ifdef KLDSYM_LOOKUP
-    /* First make sure we've got the right code loaded */
-    char basesym[] = "ng_make_node", socksym[] = "ngdomain";
-    struct kld_sym_lookup baselookup = { sizeof baselookup, basesym, 0, 0 };
-    struct kld_sym_lookup socklookup = { sizeof socklookup, socksym, 0, 0 };
-#endif
-
     p->fd--;				/* We own the device - change fd */
 
-#ifdef KLDSYM_LOOKUP
-    if (kldsym(0, KLDSYM_LOOKUP, &baselookup) == -1) {
-      log_Printf(LogWARN, "Can't run without options NETGRAPH in the kernel\n");
+#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
+    if (modfind("netgraph") == -1) {
+      log_Printf(LogWARN, "Netgraph is not built into the kernel\n");
       return NULL;
     }
 
-    if (kldsym(0, KLDSYM_LOOKUP, &socklookup) == -1 &&
+    if (modfind("ng_socket") == -1 &&
         ID0kldload("ng_socket") == -1) {
       log_Printf(LogWARN, "kldload: ng_socket: %s\n", strerror(errno));
       return NULL;
diff --git a/usr.sbin/ppp/id.c b/usr.sbin/ppp/id.c
index 3ca74c63bf03..06aad0294177 100644
--- a/usr.sbin/ppp/id.c
+++ b/usr.sbin/ppp/id.c
@@ -269,7 +269,7 @@ ID0kill(pid_t pid, int sig)
   return result;
 }
 
-#ifdef KLDSYM_LOOKUP
+#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
 int
 ID0kldload(const char *dev)
 {
diff --git a/usr.sbin/ppp/id.h b/usr.sbin/ppp/id.h
index bba273f209cb..3254f6437580 100644
--- a/usr.sbin/ppp/id.h
+++ b/usr.sbin/ppp/id.h
@@ -45,6 +45,6 @@ extern void ID0logout(const char *, int);
 extern int ID0bind_un(int, const struct sockaddr_un *);
 extern int ID0connect_un(int, const struct sockaddr_un *);
 extern int ID0kill(pid_t, int);
-#ifdef KLDSYM_LOOKUP
+#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
 extern int ID0kldload(const char *);
 #endif