files/common/getprinter.c

	getprinter.c revision 32232bf4531ddb458488ba01c9df68685921ebf4
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 *  files/printers_getbyname.c -- "files" backend for
 *  nsswitch "printers" database.
 *
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

static const char *printers = "/etc/printers.conf";

#pragma weak _nss_files__printers_constr = _nss_files_printers_constr

#include "files_common.h"
#include <stdlib.h>
#include <strings.h>

static nss_status_t _nss_files_XY_printers(files_backend_ptr_t,
    nss_XbyY_args_t *, const char *);


static nss_status_t
getent(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    nss_XbyY_args_t  *args = (nss_XbyY_args_t *)a;

    return (_nss_files_XY_all(be, args, 0, 0, 0));
}


static nss_status_t
getbyname(be, a)
    files_backend_ptr_t be;
    void            *a;
{
    nss_XbyY_args_t     *argp = (nss_XbyY_args_t *)a;
    nss_status_t        res;

    /* printers_getbyname() has not set/endent; rewind on each call */
    if ((res = _nss_files_setent(be, 0)) != NSS_SUCCESS) {
        return (res);
    }
    return (_nss_files_XY_printers(be, argp, argp->key.name));
}

static files_backend_op_t printers_ops[] = {
    _nss_files_destr,
    _nss_files_endent,
    _nss_files_setent,
    getent,
    getbyname
};

nss_backend_t *
_nss_files_printers_constr(dummy1, dummy2, dummy3)
    const char  *dummy1, *dummy2, *dummy3;
{
    return (_nss_files_constr(printers_ops,
        sizeof (printers_ops) / sizeof (printers_ops[0]),
        printers,
        NSS_LINELEN_PRINTERS,
        NULL));
}

/*
 * printers has the hostname as part of the data in the file, but the other
 * backends don't include it in the data passed to the backend.  For this
 * reason, we process everything here and don't bother calling the backend.
 */
static nss_status_t
_nss_files_XY_printers(be, args, filter)
    files_backend_ptr_t be;
    nss_XbyY_args_t     *args;
    const char      *filter;
            /*
             * filter not useful here since the key
             * we are looking for is the first "word"
             * on the line and we can be fast enough.
             */
{
    nss_status_t        res;
    int parsestat;
    int namelen;

    if (be->buf == 0 &&
        (be->buf = (char *)malloc(be->minbuf)) == 0) {
        (void) _nss_files_endent(be, 0);
        return (NSS_UNAVAIL); /* really panic, malloc failed */
    }

    res = NSS_NOTFOUND;
    namelen = strlen(args->key.name);

    while (1) {
        char        *instr  = be->buf;
        char        *p, *limit;
        int     linelen;
        int     found = 0;

        /*
         * _nss_files_read_line does process the '\' that are used
         * in /etc/printers.conf for continuation and gives one long
         * buffer.
         *
         * linelen counts the characters up to but excluding the '\n'
         */
        if ((linelen = _nss_files_read_line(be->f, instr,
            be->minbuf)) < 0) {
            /* End of file */
            args->returnval = 0;
            args->erange    = 0;
            break;
        }
        p = instr;

        if (*p == '#')                  /* comment */
            continue;

        /*
         * find the name in the namelist a|b|c...:
         */
        if ((limit = strchr(instr, ':')) == NULL)   /* bad line */
            continue;
        while ((p < limit) && (found == 0)) {
            if ((strncmp(p, args->key.name, namelen) == 0) &&
                ((*(p+namelen) == '|') || (*(p+namelen) == ':')))
                found++;
            else {
                if ((p = strchr(p, '|')) == NULL)
                    p = limit;
                else    /* skip the '|' */
                    p++;
            }
        }
        if (found == 0)
            continue;

        p = instr;

        if (args->buf.buflen <= linelen) {  /* not enough buffer */
            args->erange = 1;
            break;
        }
        (void) memcpy(args->buf.buffer, p, linelen);
        args->buf.buffer[linelen] = '\0';
        args->returnval = args->buf.result;
        res = NSS_SUCCESS;
        break;
    }
    (void) _nss_files_endent(be, 0);
    return (res);
}