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#include <u.h>
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#include <libc.h>
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#include <venti.h>
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int
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vtsrvhello(VtConn *z)
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{
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	VtFcall tx, rx;
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	Packet *p;
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	if((p = vtrecv(z)) == nil)
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		return -1;
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	if(vtfcallunpack(&tx, p) < 0){
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		packetfree(p);
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		return -1;
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	}
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	packetfree(p);
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	if(tx.msgtype != VtThello){
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		vtfcallclear(&tx);
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		werrstr("bad packet type %d; want Thello %d", tx.msgtype, VtThello);
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		return -1;
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	}
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	if(tx.tag != 0){
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		vtfcallclear(&tx);
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		werrstr("bad tag in hello");
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		return -1;
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	}
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	if(strcmp(tx.version, z->version) != 0){
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		vtfcallclear(&tx);
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		werrstr("bad version in hello");
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		return -1;
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	}
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	vtfree(z->uid);
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	z->uid = tx.uid;
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	tx.uid = nil;
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	vtfcallclear(&tx);
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	memset(&rx, 0, sizeof rx);
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	rx.msgtype = VtRhello;
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	rx.tag = tx.tag;
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	rx.sid = "anonymous";
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	if((p = vtfcallpack(&rx)) == nil)
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		return -1;
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	if(vtsend(z, p) < 0)
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		return -1;
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	return 0;
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}