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ONC+ Developer's Guide     Oracle Solaris 11 Information Library
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Document Information


1.  Introduction to ONC+ Technologies

2.  Introduction to TI-RPC

3.  rpcgen Programming Guide

4.  Programmer's Interface to RPC

5.  Advanced RPC Programming Techniques

poll() on the Server Side

Broadcast RPC



AUTH_SYS Authentication

AUTH_DES Authentication

AUTH_KERB Authentication

Authentication Using RPCSEC_GSS



Creating a Context

Changing Values and Destroying a Context

Principal Names

Setting Server Principal Names

Generating Client Principal Names

Freeing Principal Names

Receiving Credentials at the Server



Maximum Data Size

Miscellaneous Functions

Associated Files

gsscred Table

/etc/gss/qop and /etc/gss/mech

Using Port Monitors

Using inetd

Using the Listener

Multiple Server Versions

Multiple Client Versions

Using Transient RPC Program Numbers

6.  Porting From TS-RPC to TI-RPC

7.  Multithreaded RPC Programming

8.  Extensions to the Oracle Solaris RPC Library

A.  XDR Technical Note

B.  RPC Protocol and Language Specification

C.  XDR Protocol Specification

D.  RPC Code Examples

E.  portmap Utility



Multiple Client Versions

Because different hosts can run different versions of RPC servers, a client should be capable of accommodating the variations. For example, one server can run the old version of RUSERSPROG(RUSERSVERS_ORIG) while another server runs the newer version (RUSERSVERS_SHORT).

If the version on a server does not match the version number in the client creation call, clnt_call() fails with an RPCPROGVERSMISMATCH error. You can get the version numbers supported by a server and then create a client handle with the appropriate version number. Use either the routine in the following example, or clnt_create_vers(). See the rpc(3NSL) man page for more details.

Example 5-17 RPC Versions on Client Side

    enum clnt_stat status;
    u_short num_s;
    u_int num_l;
    struct rpc_err rpcerr;
    int maxvers, minvers;
    CLIENT *clnt;
    clnt = clnt_create("remote", RUSERSPROG, RUSERSVERS_SHORT,
    if (clnt == (CLIENT *) NULL) {
        clnt_pcreateerror("unable to create client handle");
    to.tv_sec = 10;          /* set the time outs */
    to.tv_usec = 0;
    status = clnt_call(clnt, RUSERSPROC_NUM, xdr_void,
                      (caddr_t) NULL, xdr_u_short, 
                          (caddr_t)&num_s, to);
    if (status == RPC_SUCCESS) {    /* Found latest version number */
        printf("num = %d\n", num_s);
    if (status != RPC_PROGVERSMISMATCH) {    /* Some other error */
        clnt_perror(clnt, "rusers");
    /* This version not supported */
    clnt_geterr(clnt, &rpcerr);
    maxvers = rpcerr.re_vers.high;    /* highest version supported */
    minvers = rpcerr.re_vers.low;     /*lowest version supported */

    if (RUSERSVERS_SHORT < minvers || RUSERSVERS_SHORT > maxvers)
                              /* doesn't meet minimum standards */
        clnt_perror(clnt, "version mismatch");
    (void) clnt_control(clnt, CLSET_VERSION, RUSERSVERS_ORIG);
    status = clnt_call(clnt, RUSERSPROC_NUM, xdr_void,
                          (caddr_t) NULL, xdr_u_int, (caddr_t)&num_l, to);
    if (status == RPC_SUCCESS)
        /* We found a version number we recognize */
        printf("num = %d\n", num_l);
    else {
        clnt_perror(clnt, "rusers");