[39e6e65a] | 1 | /*- |
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| 2 | * Copyright (c) 1985, 1988, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. All advertising materials mentioning features or use of this software |
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| 14 | * must display the following acknowledgement: |
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| 15 | * This product includes software developed by the University of |
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| 16 | * California, Berkeley and its contributors. |
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| 17 | * 4. Neither the name of the University nor the names of its contributors |
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| 18 | * may be used to endorse or promote products derived from this software |
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| 19 | * without specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 31 | * SUCH DAMAGE. |
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| 32 | * - |
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| 33 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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| 34 | * |
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| 35 | * Permission to use, copy, modify, and distribute this software for any |
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| 36 | * purpose with or without fee is hereby granted, provided that the above |
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| 37 | * copyright notice and this permission notice appear in all copies, and that |
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| 38 | * the name of Digital Equipment Corporation not be used in advertising or |
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| 39 | * publicity pertaining to distribution of the document or software without |
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| 40 | * specific, written prior permission. |
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| 41 | * |
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| 42 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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| 43 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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| 44 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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| 45 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 46 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 47 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 48 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 49 | * SOFTWARE. |
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| 50 | * - |
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| 51 | * --Copyright-- |
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| 52 | */ |
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| 53 | |
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| 54 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 55 | static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; |
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| 56 | static char rcsid[] = "$Id$"; |
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| 57 | #endif /* LIBC_SCCS and not lint */ |
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| 58 | |
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| 59 | #include <sys/param.h> |
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| 60 | #include <sys/socket.h> |
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| 61 | #include <netinet/in.h> |
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| 62 | #include <arpa/inet.h> |
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| 63 | #include <netdb.h> |
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| 64 | #include <stdio.h> |
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| 65 | #include <ctype.h> |
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| 66 | #include <errno.h> |
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| 67 | #include <string.h> |
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| 68 | #include <arpa/nameser.h> /* XXX */ |
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| 69 | #include <resolv.h> /* XXX */ |
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| 70 | |
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| 71 | #define MAXALIASES 35 |
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| 72 | |
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| 73 | static struct hostent host; |
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| 74 | static char *host_aliases[MAXALIASES]; |
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| 75 | static char hostbuf[BUFSIZ+1]; |
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| 76 | static FILE *hostf = NULL; |
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| 77 | static u_char host_addr[16]; /* IPv4 or IPv6 */ |
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| 78 | static char *h_addr_ptrs[2]; |
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| 79 | static int stayopen = 0; |
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| 80 | |
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| 81 | void |
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| 82 | _sethosthtent(f) |
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| 83 | int f; |
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| 84 | { |
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| 85 | if (!hostf) |
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| 86 | hostf = fopen(_PATH_HOSTS, "r" ); |
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| 87 | else |
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| 88 | rewind(hostf); |
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| 89 | stayopen = f; |
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| 90 | } |
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| 91 | |
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| 92 | void |
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| 93 | _endhosthtent() |
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| 94 | { |
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| 95 | if (hostf && !stayopen) { |
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| 96 | (void) fclose(hostf); |
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| 97 | hostf = NULL; |
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| 98 | } |
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| 99 | } |
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| 100 | |
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| 101 | struct hostent * |
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| 102 | gethostent() |
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| 103 | { |
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| 104 | char *p; |
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| 105 | register char *cp, **q; |
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| 106 | int af, len; |
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| 107 | |
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| 108 | if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { |
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| 109 | h_errno = NETDB_INTERNAL; |
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| 110 | return (NULL); |
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| 111 | } |
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| 112 | again: |
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| 113 | if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { |
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| 114 | h_errno = HOST_NOT_FOUND; |
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| 115 | return (NULL); |
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| 116 | } |
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| 117 | if (*p == '#') |
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| 118 | goto again; |
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| 119 | if (!(cp = strpbrk(p, "#\n"))) |
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| 120 | goto again; |
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| 121 | *cp = '\0'; |
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| 122 | if (!(cp = strpbrk(p, " \t"))) |
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| 123 | goto again; |
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| 124 | *cp++ = '\0'; |
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| 125 | if (inet_pton(AF_INET6, p, host_addr) > 0) { |
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| 126 | af = AF_INET6; |
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| 127 | len = IN6ADDRSZ; |
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| 128 | } else if (inet_pton(AF_INET, p, host_addr) > 0) { |
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| 129 | if (_res.options & RES_USE_INET6) { |
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| 130 | _map_v4v6_address((char*)host_addr, (char*)host_addr); |
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| 131 | af = AF_INET6; |
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| 132 | len = IN6ADDRSZ; |
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| 133 | } else { |
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| 134 | af = AF_INET; |
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| 135 | len = INADDRSZ; |
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| 136 | } |
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| 137 | } else { |
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| 138 | goto again; |
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| 139 | } |
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| 140 | h_addr_ptrs[0] = (char *)host_addr; |
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| 141 | h_addr_ptrs[1] = NULL; |
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| 142 | host.h_addr_list = h_addr_ptrs; |
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| 143 | host.h_length = len; |
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| 144 | host.h_addrtype = af; |
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| 145 | while (*cp == ' ' || *cp == '\t') |
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| 146 | cp++; |
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| 147 | host.h_name = cp; |
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| 148 | q = host.h_aliases = host_aliases; |
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| 149 | if ((cp = strpbrk(cp, " \t")) != NULL) |
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| 150 | *cp++ = '\0'; |
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| 151 | while (cp && *cp) { |
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| 152 | if (*cp == ' ' || *cp == '\t') { |
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| 153 | cp++; |
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| 154 | continue; |
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| 155 | } |
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| 156 | if (q < &host_aliases[MAXALIASES - 1]) |
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| 157 | *q++ = cp; |
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| 158 | if ((cp = strpbrk(cp, " \t")) != NULL) |
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| 159 | *cp++ = '\0'; |
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| 160 | } |
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| 161 | *q = NULL; |
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| 162 | h_errno = NETDB_SUCCESS; |
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| 163 | return (&host); |
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| 164 | } |
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| 165 | |
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| 166 | struct hostent * |
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| 167 | _gethostbyhtname(name, af) |
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| 168 | const char *name; |
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| 169 | int af; |
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| 170 | { |
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| 171 | register struct hostent *p; |
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| 172 | register char **cp; |
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| 173 | |
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| 174 | sethostent(0); |
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| 175 | while ((p = gethostent()) != NULL) { |
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| 176 | if (p->h_addrtype != af) |
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| 177 | continue; |
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| 178 | if (strcasecmp(p->h_name, name) == 0) |
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| 179 | break; |
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| 180 | for (cp = p->h_aliases; *cp != 0; cp++) |
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| 181 | if (strcasecmp(*cp, name) == 0) |
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| 182 | goto found; |
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| 183 | } |
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| 184 | found: |
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| 185 | endhostent(); |
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| 186 | return (p); |
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| 187 | } |
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| 188 | |
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| 189 | struct hostent * |
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| 190 | _gethostbyhtaddr(addr, len, af) |
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| 191 | const char *addr; |
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| 192 | int len, af; |
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| 193 | { |
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| 194 | register struct hostent *p; |
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| 195 | |
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| 196 | sethostent(0); |
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| 197 | while ((p = gethostent()) != NULL) |
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| 198 | if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) |
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| 199 | break; |
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| 200 | endhostent(); |
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| 201 | return (p); |
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| 202 | } |
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