ref: a23e9ac65d85d31ebc6155050070546fa3a26df6
dir: /sys/src/libsunrpc/rpc.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <sunrpc.h>
/*
* RPC protocol constants
*/
enum
{
RpcVersion = 2,
/* msg type */
MsgCall = 0,
MsgReply = 1,
/* reply stat */
MsgAccepted = 0,
MsgDenied = 1,
/* accept stat */
MsgSuccess = 0,
MsgProgUnavail = 1,
MsgProgMismatch = 2,
MsgProcUnavail = 3,
MsgGarbageArgs = 4,
MsgSystemErr = 5,
/* reject stat */
MsgRpcMismatch = 0,
MsgAuthError = 1,
/* msg auth xxx */
MsgAuthOk = 0,
MsgAuthBadCred = 1,
MsgAuthRejectedCred = 2,
MsgAuthBadVerf = 3,
MsgAuthRejectedVerf = 4,
MsgAuthTooWeak = 5,
MsgAuthInvalidResp = 6,
MsgAuthFailed = 7,
};
SunStatus
sunRpcPack(uchar *a, uchar *ea, uchar **pa, SunRpc *rpc)
{
u32int x;
if(sunUint32Pack(a, ea, &a, &rpc->xid) < 0)
goto Err;
if(rpc->iscall){
if(sunUint32Pack(a, ea, &a, (x=MsgCall, &x)) < 0
|| sunUint32Pack(a, ea, &a, (x=RpcVersion, &x)) < 0
|| sunUint32Pack(a, ea, &a, &rpc->prog) < 0
|| sunUint32Pack(a, ea, &a, &rpc->vers) < 0
|| sunUint32Pack(a, ea, &a, &rpc->proc) < 0
|| sunAuthInfoPack(a, ea, &a, &rpc->cred) < 0
|| sunAuthInfoPack(a, ea, &a, &rpc->verf) < 0
|| sunFixedOpaquePack(a, ea, &a, rpc->data, rpc->ndata) < 0)
goto Err;
}else{
if(sunUint32Pack(a, ea, &a, (x=MsgReply, &x)) < 0)
goto Err;
switch(rpc->status&0xF0000){
case 0:
case SunAcceptError:
if(sunUint32Pack(a, ea, &a, (x=MsgAccepted, &x)) < 0
|| sunAuthInfoPack(a, ea, &a, &rpc->verf) < 0)
goto Err;
break;
default:
if(sunUint32Pack(a, ea, &a, (x=MsgDenied, &x)) < 0)
goto Err;
break;
}
switch(rpc->status){
case SunSuccess:
if(sunUint32Pack(a, ea, &a, (x=MsgSuccess, &x)) < 0
|| sunFixedOpaquePack(a, ea, &a, rpc->data, rpc->ndata) < 0)
goto Err;
break;
case SunRpcMismatch:
case SunProgMismatch:
if(sunUint32Pack(a, ea, &a, (x=rpc->status&0xFFFF, &x)) < 0
|| sunUint32Pack(a, ea, &a, &rpc->low) < 0
|| sunUint32Pack(a, ea, &a, &rpc->high) < 0)
goto Err;
break;
default:
if(sunUint32Pack(a, ea, &a, (x=rpc->status&0xFFFF, &x)) < 0)
goto Err;
break;
}
}
*pa = a;
return SunSuccess;
Err:
*pa = ea;
return SunGarbageArgs;
}
uint
sunRpcSize(SunRpc *rpc)
{
uint a;
a = 4;
if(rpc->iscall){
a += 5*4;
a += sunAuthInfoSize(&rpc->cred);
a += sunAuthInfoSize(&rpc->verf);
a += sunFixedOpaqueSize(rpc->ndata);
}else{
a += 4;
switch(rpc->status&0xF0000){
case 0:
case SunAcceptError:
a += 4+sunAuthInfoSize(&rpc->verf);
break;
default:
a += 4;
break;
}
switch(rpc->status){
case SunSuccess:
a += 4+sunFixedOpaqueSize(rpc->ndata);
break;
case SunRpcMismatch:
case SunProgMismatch:
a += 3*4;
default:
a += 4;
}
}
return a;
}
SunStatus
sunRpcUnpack(uchar *a, uchar *ea, uchar **pa, SunRpc *rpc)
{
u32int x;
memset(rpc, 0, sizeof *rpc);
if(sunUint32Unpack(a, ea, &a, &rpc->xid) < 0
|| sunUint32Unpack(a, ea, &a, &x) < 0)
goto Err;
switch(x){
default:
goto Err;
case MsgCall:
rpc->iscall = 1;
if(sunUint32Unpack(a, ea, &a, &x) < 0 || x != RpcVersion
|| sunUint32Unpack(a, ea, &a, &rpc->prog) < 0
|| sunUint32Unpack(a, ea, &a, &rpc->vers) < 0
|| sunUint32Unpack(a, ea, &a, &rpc->proc) < 0
|| sunAuthInfoUnpack(a, ea, &a, &rpc->cred) < 0
|| sunAuthInfoUnpack(a, ea, &a, &rpc->verf) < 0)
goto Err;
rpc->ndata = ea-a;
rpc->data = a;
a = ea;
break;
case MsgReply:
rpc->iscall = 0;
if(sunUint32Unpack(a, ea, &a, &x) < 0)
goto Err;
switch(x){
default:
goto Err;
case MsgAccepted:
if(sunAuthInfoUnpack(a, ea, &a, &rpc->verf) < 0
|| sunUint32Unpack(a, ea, &a, &x) < 0)
goto Err;
switch(x){
case MsgSuccess:
rpc->status = SunSuccess;
rpc->ndata = ea-a;
rpc->data = a;
a = ea;
break;
case MsgProgUnavail:
case MsgProcUnavail:
case MsgGarbageArgs:
case MsgSystemErr:
rpc->status = SunAcceptError | x;
break;
case MsgProgMismatch:
rpc->status = SunAcceptError | x;
if(sunUint32Unpack(a, ea, &a, &rpc->low) < 0
|| sunUint32Unpack(a, ea, &a, &rpc->high) < 0)
goto Err;
break;
}
break;
case MsgDenied:
if(sunUint32Unpack(a, ea, &a, &x) < 0)
goto Err;
switch(x){
default:
goto Err;
case MsgAuthError:
if(sunUint32Unpack(a, ea, &a, &x) < 0)
goto Err;
rpc->status = SunAuthError | x;
break;
case MsgRpcMismatch:
rpc->status = SunRejectError | x;
if(sunUint32Unpack(a, ea, &a, &rpc->low) < 0
|| sunUint32Unpack(a, ea, &a, &rpc->high) < 0)
goto Err;
break;
}
break;
}
}
*pa = a;
return SunSuccess;
Err:
*pa = ea;
return SunGarbageArgs;
}
void
sunRpcPrint(Fmt *fmt, SunRpc *rpc)
{
fmtprint(fmt, "xid=%#ux", rpc->xid);
if(rpc->iscall){
fmtprint(fmt, " prog %#ux vers %#ux proc %#ux [", rpc->prog, rpc->vers, rpc->proc);
sunAuthInfoPrint(fmt, &rpc->cred);
fmtprint(fmt, "] [");
sunAuthInfoPrint(fmt, &rpc->verf);
fmtprint(fmt, "]");
}else{
fmtprint(fmt, " status %#ux [", rpc->status);
sunAuthInfoPrint(fmt, &rpc->verf);
fmtprint(fmt, "] low %#ux high %#ux", rpc->low, rpc->high);
}
}
void
sunAuthInfoPrint(Fmt *fmt, SunAuthInfo *ai)
{
switch(ai->flavor){
case SunAuthNone:
fmtprint(fmt, "none");
break;
case SunAuthShort:
fmtprint(fmt, "short");
break;
case SunAuthSys:
fmtprint(fmt, "sys");
break;
default:
fmtprint(fmt, "%#ux", ai->flavor);
break;
}
// if(ai->ndata)
// fmtprint(fmt, " %.*H", ai->ndata, ai->data);
}
uint
sunAuthInfoSize(SunAuthInfo *ai)
{
return 4 + sunVarOpaqueSize(ai->ndata);
}
int
sunAuthInfoPack(uchar *a, uchar *ea, uchar **pa, SunAuthInfo *ai)
{
if(sunUint32Pack(a, ea, &a, &ai->flavor) < 0
|| sunVarOpaquePack(a, ea, &a, &ai->data, &ai->ndata, 400) < 0)
goto Err;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunAuthInfoUnpack(uchar *a, uchar *ea, uchar **pa, SunAuthInfo *ai)
{
if(sunUint32Unpack(a, ea, &a, &ai->flavor) < 0
|| sunVarOpaqueUnpack(a, ea, &a, &ai->data, &ai->ndata, 400) < 0)
goto Err;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunEnumPack(uchar *a, uchar *ea, uchar **pa, int *e)
{
u32int x;
x = *e;
return sunUint32Pack(a, ea, pa, &x);
}
int
sunUint1Pack(uchar *a, uchar *ea, uchar **pa, u1int *u)
{
u32int x;
x = *u;
return sunUint32Pack(a, ea, pa, &x);
}
int
sunUint32Pack(uchar *a, uchar *ea, uchar **pa, u32int *u)
{
u32int x;
if(ea-a < 4)
goto Err;
x = *u;
*a++ = x>>24;
*a++ = x>>16;
*a++ = x>>8;
*a++ = x;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunEnumUnpack(uchar *a, uchar *ea, uchar **pa, int *e)
{
u32int x;
if(sunUint32Unpack(a, ea, pa, &x) < 0)
return -1;
*e = x;
return 0;
}
int
sunUint1Unpack(uchar *a, uchar *ea, uchar **pa, u1int *u)
{
u32int x;
if(sunUint32Unpack(a, ea, pa, &x) < 0 || (x!=0 && x!=1)){
*pa = ea;
return -1;
}
*u = x;
return 0;
}
int
sunUint32Unpack(uchar *a, uchar *ea, uchar **pa, u32int *u)
{
u32int x;
if(ea-a < 4)
goto Err;
x = *a++ << 24;
x |= *a++ << 16;
x |= *a++ << 8;
x |= *a++;
*pa = a;
*u = x;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunUint64Unpack(uchar *a, uchar *ea, uchar **pa, u64int *u)
{
u32int x, y;
if(sunUint32Unpack(a, ea, &a, &x) < 0
|| sunUint32Unpack(a, ea, &a, &y) < 0)
goto Err;
*u = ((uvlong)x<<32) | y;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunUint64Pack(uchar *a, uchar *ea, uchar **pa, u64int *u)
{
u32int x, y;
x = *u >> 32;
y = *u;
if(sunUint32Pack(a, ea, &a, &x) < 0
|| sunUint32Pack(a, ea, &a, &y) < 0)
goto Err;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
uint
sunStringSize(char *s)
{
return (4+strlen(s)+3) & ~3;
}
int
sunStringUnpack(uchar *a, uchar *ea, uchar **pa, char **s, u32int max)
{
uchar *dat;
u32int n;
if(sunVarOpaqueUnpack(a, ea, pa, &dat, &n, max) < 0)
goto Err;
/* slide string down over length to make room for NUL */
memmove(dat-1, dat, n);
dat--;
dat[n] = 0;
*s = (char*)dat;
return 0;
Err:
return -1;
}
int
sunStringPack(uchar *a, uchar *ea, uchar **pa, char **s, u32int max)
{
u32int n;
n = strlen(*s);
return sunVarOpaquePack(a, ea, pa, (uchar**)s, &n, max);
}
uint
sunVarOpaqueSize(u32int n)
{
return (4+n+3) & ~3;
}
int
sunVarOpaquePack(uchar *a, uchar *ea, uchar **pa, uchar **dat, u32int *ndat, u32int max)
{
if(*ndat > max || sunUint32Pack(a, ea, &a, ndat) < 0
|| sunFixedOpaquePack(a, ea, &a, *dat, *ndat) < 0)
goto Err;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunVarOpaqueUnpack(uchar *a, uchar *ea, uchar **pa, uchar **dat, u32int *ndat, u32int max)
{
if(sunUint32Unpack(a, ea, &a, ndat) < 0
|| *ndat > max)
goto Err;
*dat = a;
a += (*ndat+3)&~3;
if(a > ea)
goto Err;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
uint
sunFixedOpaqueSize(u32int n)
{
return (n+3) & ~3;
}
int
sunFixedOpaquePack(uchar *a, uchar *ea, uchar **pa, uchar *dat, u32int n)
{
uint nn;
nn = (n+3)&~3;
if(a+nn > ea)
goto Err;
memmove(a, dat, n);
if(nn > n)
memset(a+n, 0, nn-n);
a += nn;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}
int
sunFixedOpaqueUnpack(uchar *a, uchar *ea, uchar **pa, uchar *dat, u32int n)
{
uint nn;
nn = (n+3)&~3;
if(a+nn > ea)
goto Err;
memmove(dat, a, n);
a += nn;
*pa = a;
return 0;
Err:
*pa = ea;
return -1;
}