1 /*-
2 * Copyright (c) 1994, Garrett Wollman
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #if defined(LIBC_SCCS) && !defined(lint)
27 static char rcsid[] = "$Id: getnetnamadr.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp $";
28 #endif /* LIBC_SCCS and not lint */
29
30 #include <sys/param.h>
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
34 #include <netdb.h>
35 #include <stdio.h>
36 #include <ctype.h>
37 #include <errno.h>
38 #include <paths.h>
39 #include <string.h>
40
41 #include "Socklib_internals.h"
42
43 enum service_type {
44 SERVICE_NONE = 0,
45 SERVICE_BIND,
46 SERVICE_TABLE,
47 SERVICE_NIS };
48 #define SERVICE_MAX SERVICE_NIS
49
50 static struct {
51 const char *name;
52 enum service_type type;
53 } service_names[] = {
54 { "hosts", SERVICE_TABLE },
55 { _PATH_HOSTS, SERVICE_TABLE },
56 { "hosttable", SERVICE_TABLE },
57 { "htable", SERVICE_TABLE },
58 { "bind", SERVICE_BIND },
59 { "dns", SERVICE_BIND },
60 { "domain", SERVICE_BIND },
61 { "yp", SERVICE_NIS },
62 { "yellowpages", SERVICE_NIS },
63 { "nis", SERVICE_NIS },
64 { 0, SERVICE_NONE }
65 };
66
67 static enum service_type service_order[SERVICE_MAX + 1];
68 static int service_done = 0;
69
70 static enum service_type
get_service_name(const char * name)71 get_service_name(const char *name) {
72 int i;
73 for(i = 0; service_names[i].type != SERVICE_NONE; i++) {
74 if(!strcasecmp(name, service_names[i].name)) {
75 return service_names[i].type;
76 }
77 }
78 return SERVICE_NONE;
79 }
80
81 static void
init_services()82 init_services()
83 {
84 char *cp, *p, buf[BUFSIZ];
85 register int cc = 0;
86 FILE *fd;
87
88 if ((fd = (FILE *)fopen(_PATH_NETCONF, "r")) == NULL) {
89 /* make some assumptions */
90 service_order[0] = SERVICE_TABLE;
91 service_order[1] = SERVICE_NONE;
92 } else {
93 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {
94 if(buf[0] == '#')
95 continue;
96
97 p = buf;
98 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
99 ;
100 if (cp == NULL)
101 continue;
102 do {
103 if (isalpha(cp[0])) {
104 service_order[cc] = get_service_name(cp);
105 if(service_order[cc] != SERVICE_NONE)
106 cc++;
107 }
108 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
109 ;
110 } while(cp != NULL && cc < SERVICE_MAX);
111 }
112 service_order[cc] = SERVICE_NONE;
113 fclose(fd);
114 }
115 service_done = 1;
116 }
117
118 struct netent *
getnetbyname(const char * name)119 getnetbyname(const char *name)
120 {
121 struct netent *hp = 0;
122 int nserv = 0;
123
124 if (!service_done)
125 init_services();
126
127 while (!hp) {
128 switch (service_order[nserv]) {
129 case SERVICE_NONE:
130 return NULL;
131 case SERVICE_TABLE:
132 hp = _getnetbyhtname(name);
133 break;
134 case SERVICE_BIND:
135 hp = _getnetbydnsname(name);
136 break;
137 case SERVICE_NIS:
138 hp = _getnetbynisname(name);
139 break;
140 }
141 nserv++;
142 }
143 return hp;
144 }
145
146 struct netent *
getnetbyaddr(uint32_t addr,int af)147 getnetbyaddr(uint32_t addr, int af)
148 {
149 struct netent *hp = 0;
150 int nserv = 0;
151
152 if (!service_done)
153 init_services();
154
155 while (!hp) {
156 switch (service_order[nserv]) {
157 case SERVICE_NONE:
158 return 0;
159 case SERVICE_TABLE:
160 hp = _getnetbyhtaddr(addr, af);
161 break;
162 case SERVICE_BIND:
163 hp = _getnetbydnsaddr(addr, af);
164 break;
165 case SERVICE_NIS:
166 hp = _getnetbynisaddr(addr, af);
167 break;
168 }
169 nserv++;
170 }
171 return hp;
172 }
173
174 void
setnetent(int stayopen)175 setnetent(int stayopen)
176 {
177 _setnethtent(stayopen);
178 _setnetdnsent(stayopen);
179 }
180
181 void
endnetent()182 endnetent()
183 {
184 _endnethtent();
185 _endnetdnsent();
186 }
187