newlib-cygwin/winsup/cygwin/fhandler_procnet.cc

263 lines
6.1 KiB
C++

/* fhandler_procnet.cc: fhandler for /proc/net virtual filesystem
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#define __INSIDE_CYGWIN_NET__
#define USE_SYS_TYPES_FD_SET
#include "winsup.h"
/* 2014-04-24: Current Mingw headers define sockaddr_in6 using u_long (8 byte)
because a redefinition for LP64 systems is missing. This leads to a wrong
definition and size of sockaddr_in6 when building with winsock headers. */
#undef u_long
#define u_long __ms_u_long
#include <w32api/ws2tcpip.h>
#include <w32api/iphlpapi.h>
#include <asm/byteorder.h>
#include <stdio.h>
#include "cygerrno.h"
#include "path.h"
#include "fhandler.h"
#include "fhandler_virtual.h"
#include "dtable.h"
bool get_adapters_addresses (PIP_ADAPTER_ADDRESSES *pa0, ULONG family);
static off_t format_procnet_ifinet6 (void *, char *&);
static const virt_tab_t procnet_tab[] =
{
{ _VN ("."), FH_PROCNET, virt_directory, NULL },
{ _VN (".."), FH_PROCNET, virt_directory, NULL },
{ _VN ("if_inet6"), FH_PROCNET, virt_file, format_procnet_ifinet6 },
{ NULL, 0, FH_NADA, virt_none, NULL }
};
static const int PROCNET_LINK_COUNT =
(sizeof (procnet_tab) / sizeof (virt_tab_t)) - 1;
virtual_ftype_t
fhandler_procnet::exists ()
{
const char *path = get_name ();
debug_printf ("exists (%s)", path);
path += proc_len + 1;
while (*path != 0 && !isdirsep (*path))
path++;
if (*path == 0)
return virt_rootdir;
virt_tab_t *entry = virt_tab_search (path + 1, false, procnet_tab,
PROCNET_LINK_COUNT);
if (entry)
{
if (entry->type == virt_file && !get_adapters_addresses (NULL, AF_INET6))
return virt_none;
fileid = entry - procnet_tab;
return entry->type;
}
return virt_none;
}
fhandler_procnet::fhandler_procnet ():
fhandler_proc ()
{
}
int
fhandler_procnet::fstat (struct stat *buf)
{
fhandler_base::fstat (buf);
buf->st_mode &= ~_IFMT & NO_W;
int file_type = exists ();
switch (file_type)
{
case virt_none:
set_errno (ENOENT);
return -1;
case virt_directory:
case virt_rootdir:
buf->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
buf->st_nlink = 2;
return 0;
case virt_file:
default:
buf->st_mode |= S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
return 0;
}
}
int
fhandler_procnet::readdir (DIR *dir, dirent *de)
{
int res = ENMFILE;
if (dir->__d_position >= PROCNET_LINK_COUNT)
goto out;
if (procnet_tab[dir->__d_position].type == virt_file
&& !get_adapters_addresses (NULL, AF_INET6))
goto out;
strcpy (de->d_name, procnet_tab[dir->__d_position].name);
de->d_type = virt_ftype_to_dtype (procnet_tab[dir->__d_position].type);
dir->__d_position++;
dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
res = 0;
out:
syscall_printf ("%d = readdir(%p, %p) (%s)", res, dir, de, de->d_name);
return res;
}
int
fhandler_procnet::open (int flags, mode_t mode)
{
int res = fhandler_virtual::open (flags, mode);
if (!res)
goto out;
nohandle (true);
const char *path;
path = get_name () + proc_len + 1;
while (*path != 0 && !isdirsep (*path))
path++;
if (*path == 0)
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (flags & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
else
{
diropen = true;
goto success;
}
}
virt_tab_t *entry;
entry = virt_tab_search (path + 1, true, procnet_tab, PROCNET_LINK_COUNT);
if (!entry)
{
set_errno ((flags & O_CREAT) ? EROFS : ENOENT);
res = 0;
goto out;
}
if (flags & O_WRONLY)
{
set_errno (EROFS);
res = 0;
goto out;
}
fileid = entry - procnet_tab;
if (!fill_filebuf ())
{
res = 0;
goto out;
}
if (flags & O_APPEND)
position = filesize;
else
position = 0;
success:
res = 1;
set_flags ((flags & ~O_TEXT) | O_BINARY);
set_open_status ();
out:
syscall_printf ("%d = fhandler_proc::open(%y, 0%o)", res, flags, mode);
return res;
}
bool
fhandler_procnet::fill_filebuf ()
{
if (procnet_tab[fileid].format_func)
{
filesize = procnet_tab[fileid].format_func (NULL, filebuf);
return true;
}
return false;
}
/* Return the same scope values as Linux. */
static unsigned int
get_scope (struct in6_addr *addr)
{
if (IN6_IS_ADDR_LOOPBACK (addr))
return 0x10;
if (IN6_IS_ADDR_LINKLOCAL (addr))
return 0x20;
if (IN6_IS_ADDR_SITELOCAL (addr))
return 0x40;
if (IN6_IS_ADDR_V4COMPAT (addr))
return 0x80;
return 0x0;
}
/* Convert DAD state into Linux compatible values. */
static unsigned int dad_to_flags[] =
{
0x02, /* Invalid -> NODAD */
0x40, /* Tentative -> TENTATIVE */
0xc0, /* Duplicate -> PERMANENT | TENTATIVE */
0x20, /* Deprecated -> DEPRECATED */
0x80 /* Preferred -> PERMANENT */
};
static off_t
format_procnet_ifinet6 (void *, char *&filebuf)
{
PIP_ADAPTER_ADDRESSES pa0 = NULL, pap;
PIP_ADAPTER_UNICAST_ADDRESS pua;
ULONG alloclen;
off_t filesize = 0;
if (!get_adapters_addresses (&pa0, AF_INET6))
goto out;
alloclen = 0;
for (pap = pa0; pap; pap = pap->Next)
for (pua = pap->FirstUnicastAddress; pua; pua = pua->Next)
alloclen += 100;
if (!alloclen)
goto out;
filebuf = (char *) crealloc (filebuf, alloclen);
if (!filebuf)
goto out;
for (pap = pa0; pap; pap = pap->Next)
for (pua = pap->FirstUnicastAddress; pua; pua = pua->Next)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)
pua->Address.lpSockaddr;
for (int i = 0; i < 8; ++i)
/* __small_sprintf generates upper-case hex. */
filesize += sprintf (filebuf + filesize, "%04x",
ntohs (sin6->sin6_addr.s6_addr16[i]));
filebuf[filesize++] = ' ';
filesize += sprintf (filebuf + filesize,
"%02lx %02x %02x %02x %s\n",
(long) pap->Ipv6IfIndex,
pua->OnLinkPrefixLength,
get_scope (&((struct sockaddr_in6 *)
pua->Address.lpSockaddr)->sin6_addr),
dad_to_flags [pua->DadState],
pap->AdapterName);
}
out:
if (pa0)
free (pa0);
return filesize;
}