1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  *	files/printers_getbyname.c -- "files" backend for
23  *	nsswitch "printers" database.
24  *
25  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
26  * Use is subject to license terms.
27  */
28 
29 #pragma ident	"%Z%%M%	%I%	%E% SMI"
30 
31 static const char *printers = "/etc/printers.conf";
32 
33 #pragma weak _nss_files__printers_constr = _nss_files_printers_constr
34 
35 #include "files_common.h"
36 #include <stdlib.h>
37 #include <strings.h>
38 #include <ctype.h>
39 
40 static int
check_name(nss_XbyY_args_t * argp,const char * line,int linelen)41 check_name(nss_XbyY_args_t *argp, const char *line, int linelen)
42 {
43 
44 	const char	*limit, *linep;
45 	const char	*keyp = argp->key.name;
46 	int		klen = strlen(keyp);
47 
48 	linep = line;
49 	limit = line + linelen;
50 
51 	/*
52 	 * find the name in the namelist a|b|c...:
53 	 */
54 	while (linep+klen < limit && *linep != '|' && *linep != ':') {
55 		if ((strncmp(linep, keyp, klen) == 0) &&
56 		    ((*(linep + klen) == '|') || (*(linep + klen) == ':'))) {
57 			return (1);
58 		} else {
59 			while (linep < limit && *linep != '|' && *linep != ':')
60 				linep++;
61 			if (linep >= limit || *linep == ':')
62 				return (0);
63 			if (*linep == '|')
64 				linep++;
65 		}
66 	}
67 	return (0);
68 }
69 
70 nss_status_t
_nss_files_XY_printer(be,args,filter,check)71 _nss_files_XY_printer(be, args, filter, check)
72 	files_backend_ptr_t	be;
73 	nss_XbyY_args_t		*args;
74 	const char		*filter;	/* advisory, to speed up */
75 						/* string search */
76 	files_XY_check_func	check;	/* NULL means one-shot, for getXXent */
77 {
78 	nss_status_t		res;
79 	int	parsestat;
80 	int (*func)();
81 
82 	if (filter != NULL && *filter == '\0')
83 		return (NSS_NOTFOUND);
84 	if (be->buf == 0 &&
85 		(be->buf = malloc(be->minbuf)) == 0) {
86 		return (NSS_UNAVAIL); /* really panic, malloc failed */
87 	}
88 
89 	if (check != 0 || be->f == 0) {
90 		if ((res = _nss_files_setent(be, 0)) != NSS_SUCCESS) {
91 			return (res);
92 		}
93 	}
94 
95 	res = NSS_NOTFOUND;
96 
97 	/*CONSTCOND*/
98 	while (1) {
99 		char		*instr	= be->buf;
100 		int		linelen;
101 
102 		if ((linelen = _nss_files_read_line(be->f, instr,
103 		    be->minbuf)) < 0) {
104 			/* End of file */
105 			args->returnval = 0;
106 			args->returnlen = 0;
107 			break;
108 		}
109 
110 		/* begin at the first non-blank character */
111 		while (isspace(*instr)) {
112 			instr++;
113 			linelen--;
114 		}
115 
116 		/* comment line, skip it. */
117 		if (*instr == '#')
118 			continue;
119 
120 		/* blank line, skip it */
121 		if ((*instr == '\n') || (*instr == '\0'))
122 			continue;
123 
124 		if (filter != 0 && strstr(instr, filter) == 0) {
125 			/*
126 			 * Optimization:  if the entry doesn't contain the
127 			 *   filter string then it can't be the entry we want,
128 			 *   so don't bother looking more closely at it.
129 			 */
130 			continue;
131 		}
132 
133 		args->returnval = 0;
134 		args->returnlen = 0;
135 
136 		if (check != NULL && (*check)(args, instr, linelen) == 0)
137 			continue;
138 
139 		func = args->str2ent;
140 		parsestat = (*func)(instr, linelen, args->buf.result,
141 					args->buf.buffer, args->buf.buflen);
142 
143 		if (parsestat == NSS_STR_PARSE_SUCCESS) {
144 			args->returnval = (args->buf.result != NULL)?
145 					args->buf.result : args->buf.buffer;
146 			args->returnlen = linelen;
147 			res = NSS_SUCCESS;
148 			break;
149 		} else if (parsestat == NSS_STR_PARSE_ERANGE) {
150 			args->erange = 1;
151 			break;
152 		} else if (parsestat == NSS_STR_PARSE_PARSE)
153 			continue;
154 	}
155 
156 	/*
157 	 * stayopen is set to 0 by default in order to close the opened
158 	 * file.  Some applications may break if it is set to 1.
159 	 */
160 	if (check != 0 && !args->stayopen) {
161 		(void) _nss_files_endent(be, 0);
162 	}
163 
164 	return (res);
165 }
166 
167 static nss_status_t
getent(be,a)168 getent(be, a)
169 	files_backend_ptr_t	be;
170 	void			*a;
171 {
172 	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
173 
174 	return (_nss_files_XY_printer(be, argp, (const char *)0,
175 					(files_XY_check_func)0));
176 }
177 
178 static nss_status_t
getbyname(be,a)179 getbyname(be, a)
180 	files_backend_ptr_t	be;
181 	void			*a;
182 {
183 	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
184 
185 	return (_nss_files_XY_printer(be, argp, argp->key.name, check_name));
186 }
187 
188 static files_backend_op_t printers_ops[] = {
189 	_nss_files_destr,
190 	_nss_files_endent,
191 	_nss_files_setent,
192 	getent,
193 	getbyname
194 };
195 
196 /*ARGSUSED*/
197 nss_backend_t *
_nss_files_printers_constr(dummy1,dummy2,dummy3)198 _nss_files_printers_constr(dummy1, dummy2, dummy3)
199 	const char	*dummy1, *dummy2, *dummy3;
200 {
201 	return (_nss_files_constr(printers_ops,
202 			sizeof (printers_ops) / sizeof (printers_ops[0]),
203 			printers,
204 			NSS_LINELEN_PRINTERS,
205 			NULL));
206 }
207