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‎rls/Makefile‎

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CROSS_COMPILE=
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CC=$(CROSS_COMPILE)gcc
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all: xdr server client
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xdr:
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rpcgen dir.x
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server:
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$(CC) dir_xdr.c dir_svc.c dir_proc.c -lnsl -o dir_svc
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client:
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$(CC) dir_xdr.c dir_clnt.c rls.c -lnsl -o rls
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clean:
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rm -f *.o dir_svc rls

‎rls/README.md‎

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## Example : Passing Complex Data Structures
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from https://docs.oracle.com/cd/E19683-01/816-1435/rpcgenpguide-21470/index.html
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#### dir.x
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```
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const MAXNAMELEN = 255; /* max length of directory
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entry */
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typedef string nametype<MAXNAMELEN>; /* director entry */
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typedef struct namenode *namelist; /* link in the listing */
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/* A node in the directory listing */
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struct namenode {
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nametype name; /* name of directory entry */
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namelist next; /* next entry */
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};
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union readdir_res switch (int errno) {
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case 0:
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namelist list; /* no error: return directory listing */
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default:
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void; /* error occurred: nothing else to return */
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};
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program DIRPROG {
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version DIRVERS {
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readdir_res READDIR(nametype) = 1;
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} = 1;
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} = 0x20000076;
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```
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#### Server
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> $ rpcgen dir.x
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> $ gcc dir_svc.c dir_proc.c dir_xdr.c -o dir_svc -lnsl
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> $ dir_svc &
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#### Client
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> $ rpcgen dir.x
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> $ gcc rls.c dir_clnt.c dir_xdr.c -o rls -lnsl
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####
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> $ rls "127.0.0.1" /usr/share/lib
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> ascii
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> eqnchar
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> ...
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> tabs4
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> local
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> $
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‎rls/dir.h‎

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/*
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* Please do not edit this file.
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* It was generated using rpcgen.
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*/
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#ifndef _DIR_H_RPCGEN
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#define _DIR_H_RPCGEN
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#include <rpc/rpc.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MAXNAMELEN 255
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typedef char *nametype;
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typedef struct namenode *namelist;
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struct namenode {
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nametype name;
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namelist next;
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};
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typedef struct namenode namenode;
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struct readdir_res {
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int errno;
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union {
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namelist list;
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} readdir_res_u;
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};
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typedef struct readdir_res readdir_res;
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#define DIRPROG 0x20000076
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#define DIRVERS 1
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#if defined(__STDC__) || defined(__cplusplus)
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#define READDIR 1
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extern readdir_res * readdir_1(nametype *, CLIENT *);
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extern readdir_res * readdir_1_svc(nametype *, struct svc_req *);
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extern int dirprog_1_freeresult (SVCXPRT *, xdrproc_t, caddr_t);
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#else /* K&R C */
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#define READDIR 1
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extern readdir_res * readdir_1();
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extern readdir_res * readdir_1_svc();
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extern int dirprog_1_freeresult ();
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#endif /* K&R C */
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/* the xdr functions */
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#if defined(__STDC__) || defined(__cplusplus)
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extern bool_t xdr_nametype (XDR *, nametype*);
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extern bool_t xdr_namelist (XDR *, namelist*);
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extern bool_t xdr_namenode (XDR *, namenode*);
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extern bool_t xdr_readdir_res (XDR *, readdir_res*);
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#else /* K&R C */
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extern bool_t xdr_nametype ();
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extern bool_t xdr_namelist ();
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extern bool_t xdr_namenode ();
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extern bool_t xdr_readdir_res ();
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#endif /* K&R C */
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#ifdef __cplusplus
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}
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#endif
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#endif /* !_DIR_H_RPCGEN */

‎rls/dir.x‎

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/*
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* dir.x: Remote directory listing protocol
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*/
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const MAXNAMELEN = 255;/* max length of directory entry */
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typedef string nametype<MAXNAMELEN>;/* director entry */
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typedef struct namenode *namelist;/* link in the listing */
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/* A node in the directory listing */
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struct namenode {
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nametype name;/* name of directory entry */
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namelist next;/* next entry */
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};
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union readdir_res switch (int errno) {
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case 0:
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namelist list;/* no error: return directory listing */
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default:
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void;/* error occurred: nothing else to return */
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};
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/* The directory program definition */
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program DIRPROG {
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version DIRVERS {
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readdir_res READDIR(nametype) = 1;
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} = 1;
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} = 0x20000076;

‎rls/dir_clnt.c‎

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/*
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* Please do not edit this file.
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* It was generated using rpcgen.
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*/
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#include <memory.h> /* for memset */
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#include "dir.h"
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/* Default timeout can be changed using clnt_control() */
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static struct timeval TIMEOUT = { 25, 0 };
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readdir_res *
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readdir_1(nametype *argp, CLIENT *clnt)
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{
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static readdir_res clnt_res;
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memset((char *)&clnt_res, 0, sizeof(clnt_res));
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if (clnt_call (clnt, READDIR,
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(xdrproc_t) xdr_nametype, (caddr_t) argp,
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(xdrproc_t) xdr_readdir_res, (caddr_t) &clnt_res,
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TIMEOUT) != RPC_SUCCESS) {
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return (NULL);
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}
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return (&clnt_res);
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}

‎rls/dir_proc.c‎

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/*
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* dir_proc.c: remote readdir
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* implementation
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*/
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#include <dirent.h>
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#include "dir.h" /* Created by rpcgen */
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readdir_res *
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readdir_1_svc(dirname, req)
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nametype *dirname;
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struct svc_req *req;
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{
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DIR *dirp;
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struct dirent *d;
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namelist nl;
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namelist *nlp;
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static readdir_res res; /* must be static! */
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/* Open directory */
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dirp = opendir(*dirname);
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if (dirp == (DIR *)NULL) {
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res.errno = -1;
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return (&res);
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}
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/* Free previous result */
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xdr_free(xdr_readdir_res, &res);
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/*
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* Collect directory entries.
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* Memory allocated here is free by
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* xdr_free the next time readdir_1
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* is called
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*/
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nlp = &res.readdir_res_u.list;
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while (d = readdir(dirp)) {
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nl = *nlp = (namenode *) malloc(sizeof(namenode));
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if (nl == (namenode *) NULL) {
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res.errno = -1;
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closedir(dirp);
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return(&res);
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}
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nl->name = strdup(d->d_name);
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nlp = &nl->next;
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}
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*nlp = (namelist)NULL;
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/* Return the result */
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res.errno = 0;
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closedir(dirp);
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return (&res);
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}

‎rls/dir_svc.c‎

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/*
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* Please do not edit this file.
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* It was generated using rpcgen.
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*/
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#include "dir.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <rpc/pmap_clnt.h>
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#include <string.h>
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#include <memory.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#ifndef SIG_PF
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#define SIG_PF void(*)(int)
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#endif
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static void
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dirprog_1(struct svc_req *rqstp, register SVCXPRT *transp)
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{
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union {
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nametype readdir_1_arg;
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} argument;
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char *result;
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xdrproc_t _xdr_argument, _xdr_result;
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char *(*local)(char *, struct svc_req *);
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switch (rqstp->rq_proc) {
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case NULLPROC:
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(void) svc_sendreply (transp, (xdrproc_t) xdr_void, (char *)NULL);
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return;
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case READDIR:
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_xdr_argument = (xdrproc_t) xdr_nametype;
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_xdr_result = (xdrproc_t) xdr_readdir_res;
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local = (char *(*)(char *, struct svc_req *)) readdir_1_svc;
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break;
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default:
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svcerr_noproc (transp);
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return;
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}
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memset ((char *)&argument, 0, sizeof (argument));
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if (!svc_getargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
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svcerr_decode (transp);
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return;
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}
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result = (*local)((char *)&argument, rqstp);
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if (result != NULL && !svc_sendreply(transp, (xdrproc_t) _xdr_result, result)) {
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svcerr_systemerr (transp);
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}
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if (!svc_freeargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
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fprintf (stderr, "%s", "unable to free arguments");
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exit (1);
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}
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return;
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}
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int
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main (int argc, char **argv)
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{
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register SVCXPRT *transp;
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pmap_unset (DIRPROG, DIRVERS);
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transp = svcudp_create(RPC_ANYSOCK);
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if (transp == NULL) {
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fprintf (stderr, "%s", "cannot create udp service.");
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exit(1);
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}
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if (!svc_register(transp, DIRPROG, DIRVERS, dirprog_1, IPPROTO_UDP)) {
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fprintf (stderr, "%s", "unable to register (DIRPROG, DIRVERS, udp).");
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exit(1);
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}
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transp = svctcp_create(RPC_ANYSOCK, 0, 0);
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if (transp == NULL) {
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fprintf (stderr, "%s", "cannot create tcp service.");
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exit(1);
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}
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if (!svc_register(transp, DIRPROG, DIRVERS, dirprog_1, IPPROTO_TCP)) {
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fprintf (stderr, "%s", "unable to register (DIRPROG, DIRVERS, tcp).");
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exit(1);
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}
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svc_run ();
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fprintf (stderr, "%s", "svc_run returned");
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exit (1);
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/* NOTREACHED */
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}

‎rls/dir_xdr.c‎

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/*
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* Please do not edit this file.
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* It was generated using rpcgen.
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*/
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#include "dir.h"
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bool_t
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xdr_nametype (XDR *xdrs, nametype *objp)
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{
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register int32_t *buf;
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if (!xdr_string (xdrs, objp, MAXNAMELEN))
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return FALSE;
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return TRUE;
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}
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bool_t
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xdr_namelist (XDR *xdrs, namelist *objp)
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{
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register int32_t *buf;
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if (!xdr_pointer (xdrs, (char **)objp, sizeof (struct namenode), (xdrproc_t) xdr_namenode))
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return FALSE;
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return TRUE;
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}
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bool_t
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xdr_namenode (XDR *xdrs, namenode *objp)
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{
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register int32_t *buf;
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if (!xdr_nametype (xdrs, &objp->name))
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return FALSE;
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if (!xdr_namelist (xdrs, &objp->next))
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return FALSE;
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return TRUE;
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}
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bool_t
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xdr_readdir_res (XDR *xdrs, readdir_res *objp)
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{
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register int32_t *buf;
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if (!xdr_int (xdrs, &objp->errno))
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return FALSE;
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switch (objp->errno) {
48+
case 0:
49+
if (!xdr_namelist (xdrs, &objp->readdir_res_u.list))
50+
return FALSE;
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break;
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default:
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break;
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}
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return TRUE;
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}

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