269 lines
6.3 KiB
C++
269 lines
6.3 KiB
C++
/* fhandler_procnet.cc: fhandler for /proc/net virtual filesystem
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#define __INSIDE_CYGWIN_NET__
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#define USE_SYS_TYPES_FD_SET
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#include "winsup.h"
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#ifdef __x86_64__
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/* 2014-04-24: Current Mingw headers define sockaddr_in6 using u_long (8 byte)
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because a redefinition for LP64 systems is missing. This leads to a wrong
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definition and size of sockaddr_in6 when building with winsock headers. */
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#undef u_long
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#define u_long __ms_u_long
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#endif
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#include <w32api/ws2tcpip.h>
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#include <w32api/iphlpapi.h>
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#include <asm/byteorder.h>
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#include <stdio.h>
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#include "cygerrno.h"
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#include "path.h"
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#include "fhandler.h"
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#include "fhandler_virtual.h"
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#include "dtable.h"
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bool get_adapters_addresses (PIP_ADAPTER_ADDRESSES *pa0, ULONG family);
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static off_t format_procnet_ifinet6 (void *, char *&);
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static const virt_tab_t procnet_tab[] =
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{
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{ _VN ("."), FH_PROCNET, virt_directory, NULL },
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{ _VN (".."), FH_PROCNET, virt_directory, NULL },
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{ _VN ("if_inet6"), FH_PROCNET, virt_file, format_procnet_ifinet6 },
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{ NULL, 0, FH_NADA, virt_none, NULL }
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};
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static const int PROCNET_LINK_COUNT =
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(sizeof (procnet_tab) / sizeof (virt_tab_t)) - 1;
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/* Returns 0 if path doesn't exist, >0 if path is a directory,
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* -1 if path is a file, -2 if path is a symlink, -3 if path is a pipe,
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* -4 if path is a socket.
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*/
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virtual_ftype_t
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fhandler_procnet::exists ()
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{
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const char *path = get_name ();
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debug_printf ("exists (%s)", path);
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path += proc_len + 1;
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while (*path != 0 && !isdirsep (*path))
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path++;
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if (*path == 0)
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return virt_rootdir;
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virt_tab_t *entry = virt_tab_search (path + 1, false, procnet_tab,
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PROCNET_LINK_COUNT);
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if (entry)
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{
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if (entry->type == virt_file && !get_adapters_addresses (NULL, AF_INET6))
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return virt_none;
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fileid = entry - procnet_tab;
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return entry->type;
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}
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return virt_none;
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}
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fhandler_procnet::fhandler_procnet ():
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fhandler_proc ()
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{
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}
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int __reg2
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fhandler_procnet::fstat (struct stat *buf)
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{
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fhandler_base::fstat (buf);
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buf->st_mode &= ~_IFMT & NO_W;
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int file_type = exists ();
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switch (file_type)
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{
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case virt_none:
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set_errno (ENOENT);
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return -1;
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case virt_directory:
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case virt_rootdir:
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buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
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buf->st_nlink = 2;
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return 0;
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case virt_file:
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default:
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buf->st_mode |= S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
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return 0;
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}
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}
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int
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fhandler_procnet::readdir (DIR *dir, dirent *de)
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{
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int res = ENMFILE;
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if (dir->__d_position >= PROCNET_LINK_COUNT)
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goto out;
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if (procnet_tab[dir->__d_position].type == virt_file
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&& !get_adapters_addresses (NULL, AF_INET6))
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goto out;
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strcpy (de->d_name, procnet_tab[dir->__d_position].name);
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de->d_type = virt_ftype_to_dtype (procnet_tab[dir->__d_position].type);
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dir->__d_position++;
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dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
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res = 0;
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out:
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syscall_printf ("%d = readdir(%p, %p) (%s)", res, dir, de, de->d_name);
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return res;
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}
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int
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fhandler_procnet::open (int flags, mode_t mode)
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{
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int res = fhandler_virtual::open (flags, mode);
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if (!res)
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goto out;
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nohandle (true);
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const char *path;
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path = get_name () + proc_len + 1;
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while (*path != 0 && !isdirsep (*path))
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path++;
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if (*path == 0)
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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{
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set_errno (EEXIST);
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res = 0;
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goto out;
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}
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else if (flags & O_WRONLY)
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{
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set_errno (EISDIR);
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res = 0;
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goto out;
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}
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else
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{
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flags |= O_DIROPEN;
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goto success;
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}
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}
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virt_tab_t *entry;
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entry = virt_tab_search (path + 1, true, procnet_tab, PROCNET_LINK_COUNT);
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if (!entry)
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{
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set_errno ((flags & O_CREAT) ? EROFS : ENOENT);
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res = 0;
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goto out;
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}
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if (flags & O_WRONLY)
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{
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set_errno (EROFS);
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res = 0;
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goto out;
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}
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fileid = entry - procnet_tab;
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if (!fill_filebuf ())
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{
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res = 0;
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goto out;
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}
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if (flags & O_APPEND)
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position = filesize;
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else
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position = 0;
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success:
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res = 1;
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set_flags ((flags & ~O_TEXT) | O_BINARY);
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set_open_status ();
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out:
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syscall_printf ("%d = fhandler_proc::open(%y, 0%o)", res, flags, mode);
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return res;
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}
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bool
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fhandler_procnet::fill_filebuf ()
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{
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if (procnet_tab[fileid].format_func)
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{
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filesize = procnet_tab[fileid].format_func (NULL, filebuf);
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return true;
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}
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return false;
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}
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/* Return the same scope values as Linux. */
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static unsigned int
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get_scope (struct in6_addr *addr)
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{
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if (IN6_IS_ADDR_LOOPBACK (addr))
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return 0x10;
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if (IN6_IS_ADDR_LINKLOCAL (addr))
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return 0x20;
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if (IN6_IS_ADDR_SITELOCAL (addr))
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return 0x40;
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if (IN6_IS_ADDR_V4COMPAT (addr))
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return 0x80;
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return 0x0;
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}
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/* Convert DAD state into Linux compatible values. */
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static unsigned int dad_to_flags[] =
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{
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0x02, /* Invalid -> NODAD */
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0x40, /* Tentative -> TENTATIVE */
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0xc0, /* Duplicate -> PERMANENT | TENTATIVE */
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0x20, /* Deprecated -> DEPRECATED */
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0x80 /* Preferred -> PERMANENT */
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};
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static off_t
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format_procnet_ifinet6 (void *, char *&filebuf)
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{
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PIP_ADAPTER_ADDRESSES pa0 = NULL, pap;
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PIP_ADAPTER_UNICAST_ADDRESS pua;
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ULONG alloclen;
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off_t filesize = 0;
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if (!get_adapters_addresses (&pa0, AF_INET6))
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goto out;
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alloclen = 0;
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for (pap = pa0; pap; pap = pap->Next)
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for (pua = pap->FirstUnicastAddress; pua; pua = pua->Next)
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alloclen += 100;
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if (!alloclen)
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goto out;
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filebuf = (char *) crealloc (filebuf, alloclen);
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if (!filebuf)
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goto out;
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for (pap = pa0; pap; pap = pap->Next)
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for (pua = pap->FirstUnicastAddress; pua; pua = pua->Next)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
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pua->Address.lpSockaddr;
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for (int i = 0; i < 8; ++i)
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/* __small_sprintf generates upper-case hex. */
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filesize += sprintf (filebuf + filesize, "%04x",
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ntohs (sin6->sin6_addr.s6_addr16[i]));
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filebuf[filesize++] = ' ';
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filesize += sprintf (filebuf + filesize,
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"%02lx %02x %02x %02x %s\n",
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(long) pap->Ipv6IfIndex,
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pua->OnLinkPrefixLength,
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get_scope (&((struct sockaddr_in6 *)
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pua->Address.lpSockaddr)->sin6_addr),
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dad_to_flags [pua->DadState],
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pap->AdapterName);
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}
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out:
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if (pa0)
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free (pa0);
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return filesize;
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}
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