#include "stolen_from_fuse.h"
char *socket_name = "/vsys/fd_fusemount.control";
-
+unsigned int arg_length = 128;
+
+void send_argument(int control_channel_fd, 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;
}
+int get_magic_fd (char *data) {
+ char *ptr;
+ int fd;
+
+ data[arg_length-1]='\0';
+ ptr = strstr(data,"fd=");
+ if (!ptr)
+ return -1;
+
+ // Found two fd= expressions
+ if (strstr(ptr+3,"fd="))
+ return -1;
+
+ 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;
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) );
+ send_argument(fd, source);
+ send_argument(fd, target );
+ send_argument(fd, filesystemtype );
+ send_argument(fd, data );
- 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 );
+ old_fuse_fd = get_magic_fd (data);
+
+ send_fd(fd, old_fuse_fd);
+
+ if (fuse_fd == -1) {
+ printf ("Reroutemount: Could not identify FUSE fd: %d\n", fuse_fd);
+ exit(1);
+ }
+
+ new_fuse_fd=receive_fd(fd);
+
+ if (new_fuse_fd == -1) {
+ printf ("Reroutemount: Fusemount returned bad fd: %d\n", fuse_fd);
+ exit(1);
+ }
+ if( dup2(new_fuse_fd, old_fuse_fd ) != new_fuse_fd ) {
+ printf ("Could not duplicate returned file descriptor\n");
+ exit(1);
}
close(fd);