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
|
#include <u.h>
#include <libc.h>
#include <venti.h>
int ventidoublechecksha1 = 1;
static int
vtfcallrpc(VtConn *z, VtFcall *ou, VtFcall *in)
{
Packet *p;
p = vtfcallpack(ou);
if(p == nil)
return -1;
if((p = _vtrpc(z, p, ou)) == nil)
return -1;
if(vtfcallunpack(in, p) < 0){
packetfree(p);
return -1;
}
if(chattyventi)
fprint(2, "%s <- %F\n", argv0, in);
if(in->msgtype == VtRerror){
werrstr(in->error);
vtfcallclear(in);
packetfree(p);
return -1;
}
if(in->msgtype != ou->msgtype+1){
werrstr("type mismatch: sent %c%d got %c%d",
"TR"[ou->msgtype&1], ou->msgtype>>1,
"TR"[in->msgtype&1], in->msgtype>>1);
vtfcallclear(in);
packetfree(p);
return -1;
}
packetfree(p);
return 0;
}
int
vthello(VtConn *z)
{
VtFcall tx, rx;
memset(&tx, 0, sizeof tx);
tx.msgtype = VtThello;
tx.version = z->version;
tx.uid = z->uid;
if(tx.uid == nil)
tx.uid = "anonymous";
if(vtfcallrpc(z, &tx, &rx) < 0)
return -1;
z->sid = rx.sid;
rx.sid = 0;
vtfcallclear(&rx);
return 0;
}
Packet*
vtreadpacket(VtConn *z, uchar score[VtScoreSize], uint type, int n)
{
VtFcall tx, rx;
if(memcmp(score, vtzeroscore, VtScoreSize) == 0)
return packetalloc();
if(z == nil){
werrstr("not connected");
return nil;
}
if(z->version[1] == '2' && n >= (1<<16)) {
werrstr("read count too large for protocol");
return nil;
}
memset(&tx, 0, sizeof tx);
tx.msgtype = VtTread;
tx.blocktype = type;
tx.count = n;
memmove(tx.score, score, VtScoreSize);
if(vtfcallrpc(z, &tx, &rx) < 0)
return nil;
if(packetsize(rx.data) > n){
werrstr("read returned too much data");
packetfree(rx.data);
return nil;
}
if(ventidoublechecksha1){
packetsha1(rx.data, tx.score);
if(memcmp(score, tx.score, VtScoreSize) != 0){
werrstr("read asked for %V got %V", score, tx.score);
packetfree(rx.data);
return nil;
}
}
return rx.data;
}
int
vtread(VtConn *z, uchar score[VtScoreSize], uint type, uchar *buf, int n)
{
int nn;
Packet *p;
if((p = vtreadpacket(z, score, type, n)) == nil)
return -1;
nn = packetsize(p);
if(packetconsume(p, buf, nn) < 0)
abort();
packetfree(p);
return nn;
}
int
vtwritepacket(VtConn *z, uchar score[VtScoreSize], uint type, Packet *p)
{
VtFcall tx, rx;
if(packetsize(p) == 0){
memmove(score, vtzeroscore, VtScoreSize);
return 0;
}
tx.msgtype = VtTwrite;
tx.blocktype = type;
tx.data = p;
if(ventidoublechecksha1)
packetsha1(p, score);
if(vtfcallrpc(z, &tx, &rx) < 0)
return -1;
if(ventidoublechecksha1){
if(memcmp(score, rx.score, VtScoreSize) != 0){
werrstr("sha1 hash mismatch: want %V got %V", score, rx.score);
return -1;
}
}else
memmove(score, rx.score, VtScoreSize);
return 0;
}
int
vtwrite(VtConn *z, uchar score[VtScoreSize], uint type, uchar *buf, int n)
{
Packet *p;
int nn;
p = packetforeign(buf, n, 0, nil);
nn = vtwritepacket(z, score, type, p);
packetfree(p);
return nn;
}
int
vtsync(VtConn *z)
{
VtFcall tx, rx;
tx.msgtype = VtTsync;
return vtfcallrpc(z, &tx, &rx);
}
int
vtping(VtConn *z)
{
VtFcall tx, rx;
tx.msgtype = VtTping;
return vtfcallrpc(z, &tx, &rx);
}
int
vtconnect(VtConn *z)
{
if(vtversion(z) < 0)
return -1;
if(vthello(z) < 0)
return -1;
return 0;
}
int
vtgoodbye(VtConn *z)
{
VtFcall tx, rx;
tx.msgtype = VtTgoodbye;
vtfcallrpc(z, &tx, &rx); /* always fails: no VtRgoodbye */
return 0;
}
|