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1.1 root 1: /*-
2: * Copyright (c) 1985, 1989 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted provided
6: * that: (1) source distributions retain this entire copyright notice and
7: * comment, and (2) distributions including binaries display the following
8: * acknowledgement: ``This product includes software developed by the
9: * University of California, Berkeley and its contributors'' in the
10: * documentation or other materials provided with the distribution and in
11: * all advertising materials mentioning features or use of this software.
12: * Neither the name of the University nor the names of its contributors may
13: * be used to endorse or promote products derived from this software without
14: * specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
16: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
17: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #if defined(LIBC_SCCS) && !defined(lint)
21: static char sccsid[] = "@(#)res_init.c 6.14 (Berkeley) 6/27/90";
22: #endif /* LIBC_SCCS and not lint */
23:
24: #include <sys/types.h>
25: #include <sys/socket.h>
26: #include <netinet/in.h>
27: #include <stdio.h>
28: #include <arpa/nameser.h>
29: #include <resolv.h>
30:
31: /*
32: * Resolver state default settings
33: */
34:
35: struct state _res = {
36: RES_TIMEOUT, /* retransmition time interval */
37: 4, /* number of times to retransmit */
38: RES_DEFAULT, /* options flags */
39: 1, /* number of name servers */
40: };
41:
42: /*
43: * Set up default settings. If the configuration file exist, the values
44: * there will have precedence. Otherwise, the server address is set to
45: * INADDR_ANY and the default domain name comes from the gethostname().
46: *
47: * The configuration file should only be used if you want to redefine your
48: * domain or run without a server on your machine.
49: *
50: * Return 0 if completes successfully, -1 on error
51: */
52: res_init()
53: {
54: register FILE *fp;
55: register char *cp, **pp;
56: register int n;
57: char buf[BUFSIZ];
58: extern u_long inet_addr();
59: extern char *index();
60: extern char *strcpy(), *strncpy();
61: extern char *getenv();
62: int nserv = 0; /* number of nameserver records read from file */
63: int haveenv = 0;
64: int havesearch = 0;
65:
66: _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
67: _res.nsaddr.sin_family = AF_INET;
68: _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
69: _res.nscount = 1;
70:
71: /* Allow user to override the local domain definition */
72: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
73: (void)strncpy(_res.defdname, cp, sizeof(_res.defdname));
74: haveenv++;
75: }
76:
77: if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
78: /* read the config file */
79: while (fgets(buf, sizeof(buf), fp) != NULL) {
80: /* read default domain name */
81: if (!strncmp(buf, "domain", sizeof("domain") - 1)) {
82: if (haveenv) /* skip if have from environ */
83: continue;
84: cp = buf + sizeof("domain") - 1;
85: while (*cp == ' ' || *cp == '\t')
86: cp++;
87: if ((*cp == '\0') || (*cp == '\n'))
88: continue;
89: (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
90: if ((cp = index(_res.defdname, '\n')) != NULL)
91: *cp = '\0';
92: havesearch = 0;
93: continue;
94: }
95: /* set search list */
96: if (!strncmp(buf, "search", sizeof("search") - 1)) {
97: if (haveenv) /* skip if have from environ */
98: continue;
99: cp = buf + sizeof("search") - 1;
100: while (*cp == ' ' || *cp == '\t')
101: cp++;
102: if ((*cp == '\0') || (*cp == '\n'))
103: continue;
104: (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
105: if ((cp = index(_res.defdname, '\n')) != NULL)
106: *cp = '\0';
107: /*
108: * Set search list to be blank-separated strings
109: * on rest of line.
110: */
111: cp = _res.defdname;
112: pp = _res.dnsrch;
113: *pp++ = cp;
114: for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
115: if (*cp == ' ' || *cp == '\t') {
116: *cp = 0;
117: n = 1;
118: } else if (n) {
119: *pp++ = cp;
120: n = 0;
121: }
122: }
123: /* null terminate last domain if there are excess */
124: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
125: cp++;
126: *cp = '\0';
127: *pp++ = 0;
128: havesearch = 1;
129: continue;
130: }
131: /* read nameservers to query */
132: if (!strncmp(buf, "nameserver", sizeof("nameserver") - 1) &&
133: nserv < MAXNS) {
134: cp = buf + sizeof("nameserver") - 1;
135: while (*cp == ' ' || *cp == '\t')
136: cp++;
137: if ((*cp == '\0') || (*cp == '\n'))
138: continue;
139: if ((_res.nsaddr_list[nserv].sin_addr.s_addr =
140: inet_addr(cp)) == (unsigned)-1) {
141: _res.nsaddr_list[nserv].sin_addr.s_addr
142: = INADDR_ANY;
143: continue;
144: }
145: _res.nsaddr_list[nserv].sin_family = AF_INET;
146: _res.nsaddr_list[nserv].sin_port = htons(NAMESERVER_PORT);
147: nserv++;
148: continue;
149: }
150: }
151: if (nserv > 1)
152: _res.nscount = nserv;
153: (void) fclose(fp);
154: }
155: if (_res.defdname[0] == 0) {
156: if (gethostname(buf, sizeof(_res.defdname)) == 0 &&
157: (cp = index(buf, '.')))
158: (void)strcpy(_res.defdname, cp + 1);
159: }
160:
161: /* find components of local domain that might be searched */
162: if (havesearch == 0) {
163: pp = _res.dnsrch;
164: *pp++ = _res.defdname;
165: for (cp = _res.defdname, n = 0; *cp; cp++)
166: if (*cp == '.')
167: n++;
168: cp = _res.defdname;
169: for (; n >= LOCALDOMAINPARTS && pp < _res.dnsrch + MAXDFLSRCH;
170: n--) {
171: cp = index(cp, '.');
172: *pp++ = ++cp;
173: }
174: *pp++ = 0;
175: }
176: _res.options |= RES_INIT;
177: return (0);
178: }
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