96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
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/* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
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#include "inc.h"
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char rpc_buf[RPC_BUF_SIZE];
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char *rpc_ptr;
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static struct channel rpc_chan;
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/*===========================================================================*
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* rpc_open *
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*===========================================================================*/
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int rpc_open(void)
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{
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/* Open a HGFS RPC backdoor channel to the VMware host, and make sure that it
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* is working. Return OK upon success, or a negative error code otherwise; in
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* particular, return EAGAIN if shared folders are disabled.
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*/
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int r;
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if ((r = channel_open(&rpc_chan, CH_OUT)) != OK)
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return r;
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r = rpc_test();
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if (r != OK)
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channel_close(&rpc_chan);
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return r;
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}
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/*===========================================================================*
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* rpc_query *
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*===========================================================================*/
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int rpc_query(void)
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{
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/* Send a HGFS RPC query over the backdoor channel. Return OK upon success, or
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* a negative error code otherwise; EAGAIN is returned if shared folders are
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* disabled. In general, we make the assumption that the sender (= VMware)
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* speaks the protocol correctly. Hence, the callers of this function do not
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* check for lengths.
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*/
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int r, len, id, err;
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len = RPC_LEN;
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/* A more robust version of this call could reopen the channel and
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* retry the request upon low-level failure.
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*/
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r = channel_send(&rpc_chan, rpc_buf, len);
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if (r < 0) return r;
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r = channel_recv(&rpc_chan, rpc_buf, sizeof(rpc_buf));
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if (r < 0) return r;
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if (r < 2 || (len > 2 && r < 10)) return EIO;
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RPC_RESET;
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if (RPC_NEXT8 != '1') return EAGAIN;
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if (RPC_NEXT8 != ' ') return EAGAIN;
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if (len <= 2) return OK;
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id = RPC_NEXT32;
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err = RPC_NEXT32;
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return error_convert(err);
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}
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/*===========================================================================*
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* rpc_test *
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*===========================================================================*/
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int rpc_test(void)
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{
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/* Test whether HGFS communication is working. Return OK on success, EAGAIN if
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* shared folders are disabled, or another negative error code upon error.
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*/
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RPC_RESET;
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RPC_NEXT8 = 'f';
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RPC_NEXT8 = ' ';
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return rpc_query();
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}
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/*===========================================================================*
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* rpc_close *
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*===========================================================================*/
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void rpc_close(void)
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{
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/* Close the HGFS RPC backdoor channel.
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*/
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channel_close(&rpc_chan);
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}
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