X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fuse%2Freroutemount.c;h=c1c140b7a1f5cecf201b2404751bca63ced59840;hb=2b07978b1e21113105b6ea76dca1900da83c2dc3;hp=3fa229e2bf85df647521511dc391faa3ce4df940;hpb=59ad54209a4973b76b3abf44f22d61aa75621d89;p=vsys-wrappers.git

diff --git a/fuse/reroutemount.c b/fuse/reroutemount.c
index 3fa229e..c1c140b 100644
--- a/fuse/reroutemount.c
+++ b/fuse/reroutemount.c
@@ -4,127 +4,88 @@
 #include <stdlib.h>
 #include <sys/socket.h>
 #include <sys/un.h>
-#include "stolen_from_fuse.h"
+#include "fdpass.h"
 
 char *socket_name = "/vsys/fd_fusemount.control";
 
+unsigned int arg_length = 128;
+
+void send_argument(int control_channel_fd, const char *source) {
+    int sent;
+    sent=send(control_channel_fd, source, arg_length, 0);
+    if (sent<arg_length) {
+        printf("Error receiving arguments over the control buffer\n");
+        exit(1);
+    }
+}
+
 int connect_socket() {
   int fd = socket( AF_UNIX, SOCK_STREAM, 0 );
   struct sockaddr_un addr;
   addr.sun_family = AF_UNIX;
   strcpy( addr.sun_path, socket_name );
   int len = strlen(socket_name) + sizeof(addr.sun_family);
+  printf("Connecting to %s\n", socket_name);
   assert( connect( fd, (struct sockaddr *) &addr, len ) == 0 );
   return fd;
 }
 
-void do_umount( char *const argv[], int n, int fd ) {
+int get_magic_fd (char *data) {
+    char *ptr;
+    int fd;
 
-  // write the length
-  char buf[1024];
-  sprintf( buf, "%08x\n", n );
-  write( fd, buf, strlen(buf) );
-
-  // now write each arg
-  int i;
-  for( i = 0; i < n; i++ ) {
-    assert( strlen(argv[i]) < 1024 );
-    sprintf( buf, "%s\n", argv[i] );
-    write( fd, buf, strlen(buf) );
-  }
+    data[arg_length-1]='\0';
+    ptr = strstr(data,"fd=");
+    if (!ptr)
+        return -1;
 
-  char inbuf[10];
-  int n2 = read( fd, inbuf, 10 );
-  inbuf[n2] = '\0';
+    // Found two fd= expressions
+    if (strstr(ptr+3,"fd="))
+        return -1;
 
-  int r = atoi(inbuf);
-
-}
-
-int umount2( const char *mnt, int flags ) {
- 
-  int fd = connect_socket();
-
-  const char *argv[3];
-  argv[0] = "fusermount";
-  argv[1] = "-u";
-  argv[2] = mnt;
-
-  do_umount( (char **const) argv, 3, fd );
-
-  close(fd);
- 
+    if (*(ptr+3)!='\0') {
+        sscanf(ptr+3,"%d",&fd);
+        return fd;
+    }
+    else
+        return -1;
 }
 
 int mount(const char *source, const char *target, const char *filesystemtype,
         unsigned long mountflags, const void *data) {
-
   int fd = connect_socket();
+  int old_fuse_fd, new_fuse_fd;
+  int dupfd;
 
   char buf[1024];
-  sprintf( buf, "%08x\n", 0 );
-  write( fd, buf, strlen(buf) );
-
-  sprintf( buf, "%s\n%s\n%s\n%ld\n%s\n", source, target, filesystemtype,
-	   mountflags, data );
-  write( fd, buf, strlen(buf) );
-
-  char inbuf[10];
-  int n = read( fd, inbuf, 9 );
-  inbuf[n] = '\0';
-
-  int r;
-  assert( sscanf( inbuf, "%08x\n", &r ) == 1);
-
-  int fuse_fd = 0;
-  if( r < 0 ) {
-    errno = r;
-    return -1;
-  } else if( r > 0 ) {
-    // get the fd
-    fuse_fd = receive_fd(fd);
-
-    // what was the old fd?
-    int old_fd;
-    char extra[1024];
-    int s = sscanf( data, "fd=%d,%s", &old_fd, extra );
-    assert( dup2( fuse_fd, old_fd ) == old_fd );
 
-  }
+  send_argument(fd, source);
+  send_argument(fd, target );
+  send_argument(fd, filesystemtype );
+  send_argument(fd, data );
 
-  close(fd);
-  return 0;
+  old_fuse_fd = get_magic_fd (data);
 
-}
-
-int execv( const char *path, char *const argv[] ) {
 
-  if( strstr( path, "fusermount" ) == NULL ) {
-    return execv( path, argv );
+  if (old_fuse_fd == -1) {
+      printf ("Reroutemount: Could not identify FUSE fd: %d\n", old_fuse_fd);
+      exit(1);
   }
 
-  // also make sure this is an unmount . . .
-  int n = 0;
-  char *arg = argv[n];
-  int found_u = 0;
-  while( arg != NULL ) {
-    if( strcmp( arg, "-u" ) == 0 ) {
-      found_u = 1;
-      break;
-    }
-    arg = argv[++n];
-  }
+  send_fd(fd, old_fuse_fd);
+  new_fuse_fd=receive_fd(fd);
 
-  if( !found_u ) {
-    return execv( path, argv );
+  if (new_fuse_fd == -1) {
+      printf ("Reroutemount: Fusemount returned bad fd: %d\n", new_fuse_fd);
+      exit(1);
   }
 
-  // Have root do any fusermounts we need done
-  int fd = connect_socket();
-
-  do_umount( argv, n, fd );
+  if( (dupfd=dup2(new_fuse_fd, old_fuse_fd )) != old_fuse_fd ) {
+      printf ("Could not duplicate returned file descriptor: %d\n",dupfd);
+      exit(1);
+  }
 
-  exit(0);
+  close(fd);
+  return 0;
 
 }
-