| 1 |
/* |
| 2 |
util.h -- process management and other utility functions |
| 3 |
Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl> |
| 4 |
2000-2002 Guus Sliepen <guus@sliepen.eu.org> |
| 5 |
2003 Marc Lehmannn <pcg@goof.com> |
| 6 |
|
| 7 |
This program is free software; you can redistribute it and/or modify |
| 8 |
it under the terms of the GNU General Public License as published by |
| 9 |
the Free Software Foundation; either version 2 of the License, or |
| 10 |
(at your option) any later version. |
| 11 |
|
| 12 |
This program is distributed in the hope that it will be useful, |
| 13 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
GNU General Public License for more details. |
| 16 |
|
| 17 |
You should have received a copy of the GNU General Public License |
| 18 |
along with this program; if not, write to the Free Software |
| 19 |
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 |
*/ |
| 21 |
|
| 22 |
#ifndef UTIL_H__ |
| 23 |
#define UTIL_H__ |
| 24 |
|
| 25 |
#include <sys/socket.h> |
| 26 |
#include <netinet/in.h> |
| 27 |
|
| 28 |
#include <map> |
| 29 |
|
| 30 |
#include "iom.h" |
| 31 |
#include "device.h" |
| 32 |
|
| 33 |
#define SOCKADDR sockaddr_in // this is lame, I know |
| 34 |
|
| 35 |
/* |
| 36 |
* check for an existing vped for this net, and write pid to pidfile |
| 37 |
*/ |
| 38 |
extern int write_pidfile (void); |
| 39 |
|
| 40 |
/* |
| 41 |
* kill older vped |
| 42 |
*/ |
| 43 |
extern int kill_other (int signal); |
| 44 |
|
| 45 |
/* |
| 46 |
* Detach from current terminal, write pidfile, kill parent |
| 47 |
*/ |
| 48 |
extern int detach (int do_detach); |
| 49 |
|
| 50 |
/* |
| 51 |
* Set all files and paths according to netname |
| 52 |
*/ |
| 53 |
extern void make_names (void); |
| 54 |
|
| 55 |
/* |
| 56 |
* check wether the given path is an absolute pathname |
| 57 |
*/ |
| 58 |
#define ABSOLUTE_PATH(c) ((c)[0] == '/') |
| 59 |
|
| 60 |
static inline void |
| 61 |
id2mac (unsigned int id, void *m) |
| 62 |
{ |
| 63 |
mac &p = *(mac *)m; |
| 64 |
|
| 65 |
p[0] = 0xfe; |
| 66 |
p[1] = 0xfd; |
| 67 |
p[2] = 0x80; |
| 68 |
p[3] = 0x00; |
| 69 |
p[4] = id >> 8; |
| 70 |
p[5] = id; |
| 71 |
} |
| 72 |
|
| 73 |
#define mac2id(p) (p[0] & 0x01 ? 0 : (p[4] << 8) | p[5]) |
| 74 |
|
| 75 |
struct sockinfo |
| 76 |
{ |
| 77 |
u32 host; |
| 78 |
u16 port; |
| 79 |
|
| 80 |
void set (const SOCKADDR *sa) |
| 81 |
{ |
| 82 |
host = sa->sin_addr.s_addr; |
| 83 |
port = sa->sin_port; |
| 84 |
} |
| 85 |
|
| 86 |
sockinfo() |
| 87 |
{ |
| 88 |
host = port = 0; |
| 89 |
} |
| 90 |
|
| 91 |
sockinfo(const SOCKADDR &sa) |
| 92 |
{ |
| 93 |
set (&sa); |
| 94 |
} |
| 95 |
|
| 96 |
sockinfo(const SOCKADDR *sa) |
| 97 |
{ |
| 98 |
set (sa); |
| 99 |
} |
| 100 |
|
| 101 |
SOCKADDR *sa() |
| 102 |
{ |
| 103 |
static SOCKADDR sa; |
| 104 |
|
| 105 |
sa.sin_family = AF_INET; |
| 106 |
sa.sin_port = port; |
| 107 |
sa.sin_addr.s_addr = host; |
| 108 |
|
| 109 |
return &sa; |
| 110 |
} |
| 111 |
|
| 112 |
operator const char *(); |
| 113 |
}; |
| 114 |
|
| 115 |
inline bool |
| 116 |
operator == (const sockinfo &a, const sockinfo &b) |
| 117 |
{ |
| 118 |
return a.host == b.host && a.port == b.port; |
| 119 |
} |
| 120 |
|
| 121 |
inline bool |
| 122 |
operator < (const sockinfo &a, const sockinfo &b) |
| 123 |
{ |
| 124 |
return a.host < b.host |
| 125 |
|| (a.host == b.host && a.port < b.port); |
| 126 |
} |
| 127 |
|
| 128 |
struct sliding_window { |
| 129 |
u32 v[(WINDOWSIZE + 31) / 32]; |
| 130 |
u32 seq; |
| 131 |
|
| 132 |
void reset (u32 seqno) |
| 133 |
{ |
| 134 |
memset (v, -1, sizeof v); |
| 135 |
seq = seqno; |
| 136 |
} |
| 137 |
|
| 138 |
bool recv_ok (u32 seqno) |
| 139 |
{ |
| 140 |
if (seqno <= seq - WINDOWSIZE) |
| 141 |
slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
| 142 |
"possible replay attack, or just massive packet reordering"), seqno, seq + 1);//D |
| 143 |
else if (seqno > seq + WINDOWSIZE) |
| 144 |
slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
| 145 |
"possible replay attack, or just massive packet loss"), seqno, seq + 1);//D |
| 146 |
else |
| 147 |
{ |
| 148 |
while (seqno > seq) |
| 149 |
{ |
| 150 |
seq++; |
| 151 |
|
| 152 |
u32 s = seq % WINDOWSIZE; |
| 153 |
u32 *cell = v + (s >> 5); |
| 154 |
u32 mask = 1 << (s & 31); |
| 155 |
|
| 156 |
*cell &= ~mask; |
| 157 |
} |
| 158 |
|
| 159 |
u32 s = seqno % WINDOWSIZE; |
| 160 |
u32 *cell = v + (s >> 5); |
| 161 |
u32 mask = 1 << (s & 31); |
| 162 |
|
| 163 |
//printf ("received seqno %08lx, seq %08lx, mask %08lx is %08lx\n", seqno, seq, mask, ismask); |
| 164 |
if (*cell & mask) |
| 165 |
{ |
| 166 |
slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
| 167 |
"possible replay attack, or just packet duplication"), seqno, seq + 1);//D |
| 168 |
return false; |
| 169 |
} |
| 170 |
else |
| 171 |
{ |
| 172 |
*cell |= mask; |
| 173 |
return true; |
| 174 |
} |
| 175 |
} |
| 176 |
} |
| 177 |
}; |
| 178 |
|
| 179 |
#endif |
| 180 |
|
