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Comparing gvpe/src/util.h (file contents):
Revision 1.1 by pcg, Sat Mar 1 15:53:03 2003 UTC vs.
Revision 1.8 by pcg, Thu Oct 16 02:28:36 2003 UTC

… …
20*/ 20*/
21 21
22#ifndef UTIL_H__ 22#ifndef UTIL_H__
23#define UTIL_H__ 23#define UTIL_H__
24 24
25#include <sys/socket.h> 25#include "iom.h"
26#include <netinet/in.h>
27
28#include <map>
29
30#include "device.h" 26#include "device.h"
31
32#define SOCKADDR sockaddr_in // this is lame, I know
33 27
34/* 28/*
35 * check for an existing vped for this net, and write pid to pidfile 29 * check for an existing vped for this net, and write pid to pidfile
36 */ 30 */
37extern int write_pidfile (void); 31extern int write_pidfile (void);
… …
54/* 48/*
55 * check wether the given path is an absolute pathname 49 * check wether the given path is an absolute pathname
56 */ 50 */
57#define ABSOLUTE_PATH(c) ((c)[0] == '/') 51#define ABSOLUTE_PATH(c) ((c)[0] == '/')
58 52
59static inline void
60id2mac (unsigned int id, void *m) 53extern void id2mac (unsigned int id, void *m);
61{
62 mac &p = *(mac *)m;
63 54
64 p[0] = 0xfe; 55#define mac2id(p) ((p)[0] & 0x01 ? 0 : ((p)[4] << 8) | (p)[5])
65 p[1] = 0xfd;
66 p[2] = 0x80;
67 p[3] = 0x00;
68 p[4] = id >> 8;
69 p[5] = id;
70}
71 56
72#define mac2id(p) (p[0] & 0x01 ? 0 : (p[4] << 8) | p[5]) 57struct sliding_window {
58 u32 v[(WINDOWSIZE + 31) / 32];
59 u32 seq;
73 60
74// a very simple fifo pkt-queue 61 void reset (u32 seqno)
75class pkt_queue
76 {
77 tap_packet *queue[QUEUEDEPTH];
78 int i, j;
79
80 public:
81
82 void put (tap_packet *p);
83 tap_packet *get ();
84
85 pkt_queue ();
86 ~pkt_queue ();
87 };
88
89struct sockinfo
90 {
91 u32 host;
92 u16 port;
93
94 void set (const SOCKADDR *sa)
95 { 62 {
96 host = sa->sin_addr.s_addr; 63 memset (v, -1, sizeof v);
97 port = sa->sin_port; 64 seq = seqno;
98 } 65 }
99 66
100 sockinfo() 67 bool recv_ok (u32 seqno)
101 { 68 {
102 host = port = 0; 69 if (seqno <= seq - WINDOWSIZE)
70 slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n"
71 "possible replay attack, or just massive packet reordering"), seqno, seq + 1);//D
72 else if (seqno > seq + WINDOWSIZE)
73 slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n"
74 "possible replay attack, or just massive packet loss"), seqno, seq + 1);//D
75 else
76 {
77 while (seqno > seq)
78 {
79 seq++;
80
81 u32 s = seq % WINDOWSIZE;
82 u32 *cell = v + (s >> 5);
83 u32 mask = 1 << (s & 31);
84
85 *cell &= ~mask;
86 }
87
88 u32 s = seqno % WINDOWSIZE;
89 u32 *cell = v + (s >> 5);
90 u32 mask = 1 << (s & 31);
91
92 if (*cell & mask)
93 {
94 slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n"
95 "possible replay attack, or just packet duplication"), seqno, seq + 1);//D
96 return false;
97 }
98 else
99 {
100 *cell |= mask;
101 return true;
102 }
103 }
103 } 104 }
105};
104 106
105 sockinfo(const SOCKADDR &sa) 107typedef callback0<const char *> run_script_cb;
106 {
107 set (&sa);
108 }
109 108
110 sockinfo(const SOCKADDR *sa) 109// run a shell script (or actually an external program).
111 { 110void run_script (const run_script_cb &cb, bool wait);
112 set (sa);
113 }
114 111
115 SOCKADDR *sa() 112#if ENABLE_HTTP_PROXY
116 { 113u8 *base64_encode (const u8 *data, unsigned int len);
117 static SOCKADDR sa; 114#endif
118
119 sa.sin_family = AF_INET;
120 sa.sin_port = port;
121 sa.sin_addr.s_addr = host;
122
123 return &sa;
124 }
125
126 operator const char *();
127 };
128
129inline bool
130operator == (const sockinfo &a, const sockinfo &b)
131{
132 return a.host == b.host && a.port == b.port;
133}
134
135inline bool
136operator < (const sockinfo &a, const sockinfo &b)
137{
138 return a.host < b.host
139 || (a.host == b.host && a.port < b.port);
140}
141
142// only do action once every x seconds per host.
143// currently this is quite a slow implementation,
144// but suffices for normal operation.
145struct u32_rate_limiter : private map<u32, time_t>
146 {
147 int every;
148
149 bool can (u32 host);
150
151 u32_rate_limiter (time_t every = 1)
152 {
153 this->every = every;
154 }
155 };
156
157struct net_rate_limiter : u32_rate_limiter
158 {
159 bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); }
160 bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); }
161
162 net_rate_limiter (time_t every) : u32_rate_limiter (every) {}
163 };
164 115
165#endif 116#endif
166 117

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