1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
#ifndef PPTP_PROT_H
#define PPTP_PROT_H
#include <sys/types.h>
#define hton8(x) (x)
#define ntoh8(x) (x)
#define hton16(x) htons(x)
#define ntoh16(x) ntohs(x)
#define hton32(x) htonl(x)
#define ntoh32(x) ntohl(x)
/* PPTP magic numbers: ----------------------------------------- */
#define PPTP_MAGIC 0x1A2B3C4D /* Magic cookie for PPTP datagrams */
#define PPTP_PORT 1723 /* PPTP TCP port number */
#define PPTP_PROTO 47 /* PPTP IP protocol number */
/* PPTP result codes:---------------------------------------- */
#define PPTP_CONN_RES_SUCCESS 1
#define PPTP_CONN_RES_GE 2
#define PPTP_CONN_RES_EXISTS 3
#define PPTP_CONN_RES_AUTH 4
#define PPTP_CONN_RES_PROTOCOL 5
#define PPTP_CONN_STOP_OK 1
#define PPTP_CONN_STOP_GE 2
#define PPTP_CALL_RES_OK 1
#define PPTP_CALL_RES_GE 2
#define PPTP_GE_NOCONN 1
/* Control Connection Message Types: --------------------------- */
#define PPTP_MESSAGE_CONTROL 1
#define PPTP_MESSAGE_MANAGE 2
/* Control Message Types: -------------------------------------- */
/* (Control Connection Management) */
#define PPTP_START_CTRL_CONN_RQST 1
#define PPTP_START_CTRL_CONN_RPLY 2
#define PPTP_STOP_CTRL_CONN_RQST 3
#define PPTP_STOP_CTRL_CONN_RPLY 4
#define PPTP_ECHO_RQST 5
#define PPTP_ECHO_RPLY 6
/* (Call Management) */
#define PPTP_OUT_CALL_RQST 7
#define PPTP_OUT_CALL_RPLY 8
#define PPTP_IN_CALL_RQST 9
#define PPTP_IN_CALL_RPLY 10
#define PPTP_IN_CALL_CONNECT 11
#define PPTP_CALL_CLEAR_RQST 12
#define PPTP_CALL_CLEAR_NTFY 13
/* (Error Reporting) */
#define PPTP_WAN_ERR_NTFY 14
/* (PPP Session Control) */
#define PPTP_SET_LINK_INFO 15
/* PPTP version information: --------------------------------------*/
#define PPTP_VERSION_STRING "1.00"
#define PPTP_VERSION 0x100
#define PPTP_FIRMWARE_STRING "0.01"
#define PPTP_FIRMWARE_VERSION 0x001
#define PPTP_HOSTNAME "local"
#define PPTP_VENDOR "cananian"
/* PPTP capabilities: ---------------------------------------------*/
/* (Framing capabilities for msg sender) */
#define PPTP_FRAME_ASYNC 1
#define PPTP_FRAME_SYNC 2
#define PPTP_FRAME_ANY 3
/* (Bearer capabilities for msg sender) */
#define PPTP_BEARER_ANALOG 1
#define PPTP_BEARER_DIGITAL 2
#define PPTP_BEARER_ANY 3
#define PPTP_RESULT_GENERAL_ERROR 2
/* (Reasons to close a connection) */
#define PPTP_STOP_NONE 1 /* no good reason */
#define PPTP_STOP_PROTOCOL 2 /* can't support peer's protocol version */
#define PPTP_STOP_LOCAL_SHUTDOWN 3 /* requester is being shut down */
/* PPTP datagram structures (all data in network byte order): ----------*/
struct pptp_header
{
uint16_t length; /* message length in octets, including header */
uint16_t pptp_type; /* PPTP message type. 1 for control message. */
uint32_t magic; /* this should be PPTP_MAGIC. */
uint16_t ctrl_type; /* Control message type (0-15) */
uint16_t reserved0; /* reserved. MUST BE ZERO. */
}__attribute__((packed));
struct pptp_start_ctrl_conn /* for control message types 1 and 2 */
{
struct pptp_header header;
uint16_t version; /* PPTP protocol version. = PPTP_VERSION */
uint8_t result_code; /* these two fields should be zero on rqst msg*/
uint8_t error_code; /* 0 unless result_code==2 (General Error) */
uint32_t framing_cap; /* Framing capabilities */
uint32_t bearer_cap; /* Bearer Capabilities */
uint16_t max_channels; /* Maximum Channels (=0 for PNS, PAC ignores) */
uint16_t firmware_rev; /* Firmware or Software Revision */
uint8_t hostname[64]; /* Host Name (64 octets, zero terminated) */
uint8_t vendor[64]; /* Vendor string (64 octets, zero term.) */
}__attribute__((packed));
struct pptp_stop_ctrl_conn /* for control message types 3 and 4 */
{
struct pptp_header header;
uint8_t reason_result; /* reason for rqst, result for rply */
uint8_t error_code; /* MUST be 0, unless rply result==2 (general err)*/
uint16_t reserved1; /* MUST be 0 */
}__attribute__((packed));
struct pptp_echo_rqst /* for control message type 5 */
{
struct pptp_header header;
uint32_t identifier; /* arbitrary value set by sender which is used */
/* to match up reply and request */
}__attribute__((packed));
struct pptp_echo_rply /* for control message type 6 */
{
struct pptp_header header;
uint32_t identifier; /* should correspond to id of rqst */
uint8_t result_code;
uint8_t error_code; /* =0, unless result_code==2 (general error) */
uint16_t reserved1; /* MUST BE ZERO */
}__attribute__((packed));
struct pptp_out_call_rqst /* for control message type 7 */
{
struct pptp_header header;
uint16_t call_id; /* Call ID (unique id used to multiplex data) */
uint16_t call_sernum; /* Call Serial Number (used for logging) */
uint32_t bps_min; /* Minimum BPS (lowest acceptable line speed) */
uint32_t bps_max; /* Maximum BPS (highest acceptable line speed) */
uint32_t bearer; /* Bearer type */
uint32_t framing; /* Framing type */
uint16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
uint16_t delay; /* Packet Processing Delay (in 1/10 sec) */
uint16_t phone_len; /* Phone Number Length (num. of valid digits) */
uint16_t reserved1; /* MUST BE ZERO */
uint8_t phone_num[64]; /* Phone Number (64 octets, null term.) */
uint8_t subaddress[64]; /* Subaddress (64 octets, null term.) */
}__attribute__((packed));
struct pptp_out_call_rply /* for control message type 8 */
{
struct pptp_header header;
uint16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
uint16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
uint8_t result_code; /* Result Code (1 is no errors) */
uint8_t error_code; /* Error Code (=0 unless result_code==2) */
uint16_t cause_code; /* Cause Code (addt'l failure information) */
uint32_t speed; /* Connect Speed (in BPS) */
uint16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
uint16_t delay; /* Packet Processing Delay (in 1/10 sec) */
uint32_t channel; /* Physical Channel ID (for logging) */
}__attribute__((packed));
struct pptp_in_call_rqst /* for control message type 9 */
{
struct pptp_header header;
uint16_t call_id; /* Call ID (unique id used to multiplex data) */
uint16_t call_sernum; /* Call Serial Number (used for logging) */
uint32_t bearer; /* Bearer type */
uint32_t channel; /* Physical Channel ID (for logging) */
uint16_t dialed_len; /* Dialed Number Length (# of valid digits) */
uint16_t dialing_len; /* Dialing Number Length (# of valid digits) */
uint8_t dialed_num[64]; /* Dialed Number (64 octets, zero term.) */
uint8_t dialing_num[64]; /* Dialing Number (64 octets, zero term.) */
uint8_t subaddress[64]; /* Subaddress (64 octets, zero term.) */
}__attribute__((packed));
struct pptp_in_call_rply /* for control message type 10 */
{
struct pptp_header header;
uint16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
uint16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
uint8_t result_code; /* Result Code (1 is no errors) */
uint8_t error_code; /* Error Code (=0 unless result_code==2) */
uint16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
uint16_t delay; /* Packet Processing Delay (in 1/10 sec) */
uint16_t reserved1; /* MUST BE ZERO */
}__attribute__((packed));
struct pptp_in_call_connect /* for control message type 11 */
{
struct pptp_header header;
uint16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
uint16_t reserved1; /* MUST BE ZERO */
uint32_t speed; /* Connect Speed (in BPS) */
uint16_t recv_size; /* Recv. Window Size (no. of buffered packets) */
uint16_t delay; /* Packet Processing Delay (in 1/10 sec) */
uint32_t framing; /* Framing type */
}__attribute__((packed));
struct pptp_call_clear_rqst /* for control message type 12 */
{
struct pptp_header header;
uint16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
uint16_t reserved1; /* MUST BE ZERO */
}__attribute__((packed));
struct pptp_call_clear_ntfy /* for control message type 13 */
{
struct pptp_header header;
uint16_t call_id; /* Call ID (used to multiplex data over tunnel)*/
uint8_t result_code; /* Result Code */
uint8_t error_code; /* Error Code (=0 unless result_code==2) */
uint16_t cause_code; /* Cause Code (for ISDN, is Q.931 cause code) */
uint16_t reserved1; /* MUST BE ZERO */
uint8_t call_stats[128]; /* Call Statistics: 128 octets, ascii, 0-term */
}__attribute__((packed));
struct pptp_wan_err_ntfy /* for control message type 14 */
{
struct pptp_header header;
uint16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst)*/
uint16_t reserved1; /* MUST BE ZERO */
uint32_t crc_errors; /* CRC errors */
uint32_t frame_errors; /* Framing errors */
uint32_t hard_errors; /* Hardware overruns */
uint32_t buff_errors; /* Buffer overruns */
uint32_t time_errors; /* Time-out errors */
uint32_t align_errors; /* Alignment errors */
}__attribute__((packed));
struct pptp_set_link_info /* for control message type 15 */
{
struct pptp_header header;
uint16_t call_id_peer; /* Peer's Call ID (call_id of pptp_out_call_rqst) */
uint16_t reserved1; /* MUST BE ZERO */
uint32_t send_accm; /* Send ACCM (for PPP packets; default 0xFFFFFFFF)*/
uint32_t recv_accm; /* Receive ACCM (for PPP pack.;default 0xFFFFFFFF)*/
}__attribute__((packed));
/* helpful #defines: -------------------------------------------- */
#define pptp_isvalid_ctrl(header, type, length) \
(!( ( ntoh16(((struct pptp_header *)header)->length) < (length) ) || \
( ntoh16(((struct pptp_header *)header)->pptp_type) !=(type) ) || \
( ntoh32(((struct pptp_header *)header)->magic) !=PPTP_MAGIC) || \
( ntoh16(((struct pptp_header *)header)->ctrl_type) > PPTP_SET_LINK_INFO) || \
( ntoh16(((struct pptp_header *)header)->reserved0) !=0 ) ))
#define PPTP_HEADER_CTRL(type) \
{ hton16(PPTP_CTRL_SIZE(type)), \
hton16(PPTP_MESSAGE_CONTROL), \
hton32(PPTP_MAGIC), \
hton16(type), 0 }
#define PPTP_CTRL_SIZE(type) ( \
(type==PPTP_START_CTRL_CONN_RQST)?sizeof(struct pptp_start_ctrl_conn): \
(type==PPTP_START_CTRL_CONN_RPLY)?sizeof(struct pptp_start_ctrl_conn): \
(type==PPTP_STOP_CTRL_CONN_RQST )?sizeof(struct pptp_stop_ctrl_conn): \
(type==PPTP_STOP_CTRL_CONN_RPLY )?sizeof(struct pptp_stop_ctrl_conn): \
(type==PPTP_ECHO_RQST )?sizeof(struct pptp_echo_rqst): \
(type==PPTP_ECHO_RPLY )?sizeof(struct pptp_echo_rply): \
(type==PPTP_OUT_CALL_RQST )?sizeof(struct pptp_out_call_rqst): \
(type==PPTP_OUT_CALL_RPLY )?sizeof(struct pptp_out_call_rply): \
(type==PPTP_IN_CALL_RQST )?sizeof(struct pptp_in_call_rqst): \
(type==PPTP_IN_CALL_RPLY )?sizeof(struct pptp_in_call_rply): \
(type==PPTP_IN_CALL_CONNECT )?sizeof(struct pptp_in_call_connect): \
(type==PPTP_CALL_CLEAR_RQST )?sizeof(struct pptp_call_clear_rqst): \
(type==PPTP_CALL_CLEAR_NTFY )?sizeof(struct pptp_call_clear_ntfy): \
(type==PPTP_WAN_ERR_NTFY )?sizeof(struct pptp_wan_err_ntfy): \
(type==PPTP_SET_LINK_INFO )?sizeof(struct pptp_set_link_info): \
0)
#define max(a,b) (((a)>(b))?(a):(b))
#define PPTP_CTRL_SIZE_MAX ( \
max(sizeof(struct pptp_start_ctrl_conn), \
max(sizeof(struct pptp_echo_rqst), \
max(sizeof(struct pptp_echo_rply), \
max(sizeof(struct pptp_out_call_rqst), \
max(sizeof(struct pptp_out_call_rply), \
max(sizeof(struct pptp_in_call_rqst), \
max(sizeof(struct pptp_in_call_rply), \
max(sizeof(struct pptp_in_call_connect), \
max(sizeof(struct pptp_call_clear_rqst), \
max(sizeof(struct pptp_call_clear_ntfy), \
max(sizeof(struct pptp_wan_err_ntfy), \
max(sizeof(struct pptp_set_link_info), 0)))))))))))))
#endif
|
