1 #include <u.h>
2 #include <libc.h>
3 #include <venti.h>
4 
5 int
6 vtsrvhello(VtConn *z)
7 {
8 	VtFcall tx, rx;
9 	Packet *p;
10 
11 	if((p = vtrecv(z)) == nil)
12 		return -1;
13 
14 	if(vtfcallunpack(&tx, p) < 0){
15 		packetfree(p);
16 		return -1;
17 	}
18 	packetfree(p);
19 
20 	if(tx.msgtype != VtThello){
21 		vtfcallclear(&tx);
22 		werrstr("bad packet type %d; want Thello %d", tx.msgtype, VtThello);
23 		return -1;
24 	}
25 	if(tx.tag != 0){
26 		vtfcallclear(&tx);
27 		werrstr("bad tag in hello");
28 		return -1;
29 	}
30 	if(strcmp(tx.version, z->version) != 0){
31 		vtfcallclear(&tx);
32 		werrstr("bad version in hello");
33 		return -1;
34 	}
35 	vtfree(z->uid);
36 	z->uid = tx.uid;
37 	tx.uid = nil;
38 	vtfcallclear(&tx);
39 
40 	memset(&rx, 0, sizeof rx);
41 	rx.msgtype = VtRhello;
42 	rx.tag = tx.tag;
43 	rx.sid = "anonymous";
44 	if((p = vtfcallpack(&rx)) == nil)
45 		return -1;
46 	if(vtsend(z, p) < 0)
47 		return -1;
48 
49 	return 0;
50 }