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Do a kldload() if we get ENXIO trying to open /dev/tun0

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Originally submitted by: green
This commit is contained in:
Brian Somers 1999-09-22 00:40:47 +00:00
parent e267a66620
commit fc3034ca7d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=51525
3 changed files with 50 additions and 1 deletions
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29
usr.sbin/ppp/bundle.c
View File

@ -45,6 +45,9 @@
#include <string.h>
#include <sys/uio.h>
#include <sys/wait.h>
#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
#include <sys/linker.h>
#endif
#include <termios.h>
#include <unistd.h>
@ -601,6 +604,9 @@ bundle_Create(const char *prefix, int type, const char **argv)
static struct bundle bundle; /* there can be only one */
int enoentcount, err;
const char *ifname;
#ifdef KLDSYM_LOOKUP
int kldtried;
#endif
#if defined(TUNSIFMODE) || defined(TUNSLMODE)
int iff;
#endif
@ -612,6 +618,9 @@ bundle_Create(const char *prefix, int type, const char **argv)
err = ENOENT;
enoentcount = 0;
#ifdef KLDSYM_LOOKUP
kldtried = 0;
#endif
for (bundle.unit = 0; ; bundle.unit++) {
snprintf(bundle.dev.Name, sizeof bundle.dev.Name, "%s%d",
prefix, bundle.unit);
@ -619,6 +628,26 @@ bundle_Create(const char *prefix, int type, const char **argv)
if (bundle.dev.fd >= 0)
break;
else if (errno == ENXIO) {
#ifdef KLDSYM_LOOKUP
if (bundle.unit == 0 && !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...
*/
char devsw[] = "tun_cdevsw";
struct kld_sym_lookup ksl = { sizeof ksl, devsw, 0, 0 };
if (kldsym(0, KLDSYM_LOOKUP, &ksl) == -1) {
if (ID0kldload("if_tun") != -1) {
bundle.unit--;
continue;
}
log_Printf(LogWARN, "kldload: if_tun: %s\n", strerror(errno));
}
}
#endif
err = errno;
break;
} else if (errno == ENOENT) {

19
usr.sbin/ppp/id.c
View File

@ -26,7 +26,7 @@
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>
@ -37,6 +37,9 @@
#include <stdio.h>
#include <string.h>
#include <sysexits.h>
#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
#include <sys/linker.h>
#endif
#include <unistd.h>
#ifdef __OpenBSD__
#include <util.h>
@ -265,3 +268,17 @@ ID0kill(pid_t pid, int sig)
ID0setuser();
return result;
}
#ifdef KLDSYM_LOOKUP
int
ID0kldload(const char *dev)
{
int result;
ID0set0();
result = kldload(dev);
log_Printf(LogID0, "%d = kldload(\"%s\")\n", result, dev);
ID0setuser();
return result;
}
#endif

3
usr.sbin/ppp/id.h
View File

@ -45,3 +45,6 @@ extern void ID0logout(const char *);
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
extern int ID0kldload(const char *);
#endif