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--- vdetaplib/libvdetap.c Sat Jan 29 15:02:08 2005
+++ vdetaplib/libvdetap.c Sun Jan 30 13:29:07 2005
@@ -5,26 +5,39 @@
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/stat.h>
+#include <limits.h>
+#include <dlfcn.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
-#define __USE_LARGEFILE64
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
-#include <linux/ioctl.h>
-#include <linux/if.h>
-#include <linux/if_tun.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <net/if_tun.h>
-#define TUNTAPPATH "/dev/net/tun"
+#define TUNTAPPATH "/dev/tap"
#define VDETAPEXEC "vdetap"
#define VDEALLTAP "VDEALLTAP"
#define MAX 10
+#if defined(RTLD_NEXT)
+#define REAL_LIBC RTLD_NEXT
+#else
+#define REAL_LIBC ((void *) -1L)
+#endif
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__bsdi__)
+typedef unsigned long request_t;
+#else
+typedef int request_t;
+#endif
+
int tapfd[2] = {-1,-1};
static int tapcount=0;
-static int tuncount=0;
static struct pidlist {
pid_t pid;
@@ -39,11 +52,6 @@
return rv;
}
-static void plfree (struct pidlist *el) {
- el->next=flh;
- flh=el;
-}
-
static int addpid(int pid) {
struct pidlist *plp;
if ((plp=plmalloc ()) != NULL) {
@@ -74,105 +82,41 @@
}
}
- int
-native_open(const char *pathname, int flags, mode_t data)
-{
- return (syscall(SYS_open, pathname, flags, data));
-}
-
- int
-native_ioctl(int fd, unsigned long int command, char *data)
-{
- return (syscall(SYS_ioctl, fd, command, data));
-}
-
-
int open(const char *path, int flags, ...)
{
- static char buf[PATH_MAX];
+ static int (*func) (const char *, int, mode_t) = NULL;
+ char *vdesock;
+ int pid;
va_list ap;
mode_t data;
- va_start(ap, flags);
- data = va_arg(ap, mode_t);
- va_end(ap);
-
- if (strcmp(path,TUNTAPPATH)==0 && tapfd[0] == -1) {
- if (socketpair(PF_UNIX, SOCK_DGRAM, 0,tapfd) == 0) {
- return tapfd[0];
- }
- else
- return -1;
-
- } else
- return native_open(path, flags, data);
-}
-
-int open64(const char *path, int flags, ...)
-{
- static char buf[PATH_MAX];
- va_list ap;
- mode_t data;
+ if (!func)
+ func = (int (*) (const char *, int, mode_t))
+ dlsym (REAL_LIBC, "open");
va_start(ap, flags);
- data = va_arg(ap, mode_t);
+ data = va_arg(ap, int);
va_end(ap);
if (strcmp(path,TUNTAPPATH)==0 && tapfd[0] == -1) {
if (socketpair(PF_UNIX, SOCK_DGRAM, 0,tapfd) == 0) {
- return tapfd[0];
- }
- else
- return -1;
-
- } else
- return native_open(path, flags | O_LARGEFILE, data);
-}
-
-int ioctl(int fd, unsigned long int command, ...)
-{
- va_list ap;
- char *data;
- char *vdesock;
- int pid;
-
- va_start(ap, command);
- data = va_arg(ap, char *);
- va_end(ap);
-
- if (fd == tapfd[0]) {
- if (command == TUNSETIFF) {
- struct ifreq *ifr = (struct ifreq *) data;
char num[5];
char name[10];
-
- ifr->ifr_name[IFNAMSIZ-1] = '\0';
- if (ifr->ifr_name[0] == 0) {
- if (ifr->ifr_flags & IFF_TAP)
- sprintf(name,"tap%d",tapcount++);
- else
- sprintf(name,"tun%d",tuncount++);
- strncpy(ifr->ifr_name,name,IFNAMSIZ);
- }
- else if (strchr(ifr->ifr_name, '%') != NULL) {
- sprintf(name,ifr->ifr_name,tapcount++);
- strncpy(ifr->ifr_name,name,IFNAMSIZ);
- }
- if (ifr->ifr_flags & IFF_TAP &&
- ((vdesock=getenv(ifr->ifr_name)) != NULL)
- ||(vdesock=getenv(VDEALLTAP)) != NULL){
+ sprintf(name,"tap%d",tapcount++);
+ if (((vdesock=getenv(name)) != NULL)
+ ||(vdesock=getenv(VDEALLTAP)) != NULL){
if ((pid=fork()) < 0) {
close(tapfd[1]);
errno=EINVAL;
return -1;
} else if (pid > 0) { /*father*/
- if(pid=addpid(pid) < 0) {
+ if((pid=addpid(pid)) < 0) {
close(tapfd[0]);
close(tapfd[1]);
return -1;
} else {
close(tapfd[1]);
- return 0;
+ return tapfd[0];
}
} else { /*son*/
plh=NULL;
@@ -181,34 +125,53 @@
execlp(VDETAPEXEC,"-",num,vdesock,(char *) 0);
}
}
- else /*roll back to the native tuntap*/
- {
- int newfd;
- int saverrno;
- int resultioctl;
- close(tapfd[1]);
- if ((newfd=native_open(TUNTAPPATH, O_RDWR, 0)) < 0) {
- saverrno=errno;
- close(tapfd[0]);
- errno=saverrno;
- return -1;
- } else
- {
- resultioctl=native_ioctl(fd, command, data);
- if (resultioctl < 0) {
- saverrno=errno;
- close(tapfd[0]);
- errno=saverrno;
- return -1;
- } else {
- dup2(newfd,tapfd[0]);
- return resultioctl;
- }
- }
- }
- } else
- return 0;
+ return tapfd[0];
+ }
+ else
+ return -1;
+
} else
- return (native_ioctl(fd, command, data));
+ return (*func)(path, flags, data);
+}
+
+int ioctl(int fd, unsigned long int command, ...)
+{
+ static int (*func) (int, request_t, void *) = NULL;
+ int dummy;
+ va_list ap;
+ char *data;
+ struct ifstat *ifs;
+
+ if (!func)
+ func = (int (*) (int, request_t, void *))
+ dlsym (REAL_LIBC, "ioctl");
+
+ va_start(ap, command);
+ data = va_arg(ap, char *);
+ va_end(ap);
+
+ if (fd == tapfd[0]) {
+ switch(command) {
+ case SIOCSIFFLAGS:
+ case SIOCADDMULTI:
+ case SIOCDELMULTI:
+ break;
+
+ case SIOCGIFSTATUS:
+ ifs = (struct ifstat *)data;
+ dummy = strlen(ifs->ascii);
+ if(plh && dummy < sizeof(ifs->ascii))
+ snprintf(ifs->ascii + dummy,
+ sizeof(ifs->ascii) - dummy,
+ "\tOpened by PID %d\n",
+ plh[0].pid);
+ break;
+
+ default:
+ return (*func) (fd, command, data);
+ }
+ }
+
+ return (*func) (fd, command, data);
}
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