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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [libnetworking/] [libc/] [gethostbyht.c] - Rev 1026
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/*- * Copyright (c) 1985, 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. * - * --Copyright-- */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; static char rcsid[] = "gethostbyht.c,v 1.1 1998/08/19 21:32:12 joel Exp"; #endif /* LIBC_SCCS and not lint */ #include <sys/param.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <stdio.h> #include <ctype.h> #include <errno.h> #include <string.h> #include <arpa/nameser.h> /* XXX */ #include <resolv.h> /* XXX */ #define MAXALIASES 35 static struct hostent host; static char *host_aliases[MAXALIASES]; static char hostbuf[BUFSIZ+1]; static FILE *hostf = NULL; static u_char host_addr[16]; /* IPv4 or IPv6 */ static char *h_addr_ptrs[2]; static int stayopen = 0; void _sethosthtent(f) int f; { if (!hostf) hostf = fopen(_PATH_HOSTS, "r" ); else rewind(hostf); stayopen = f; } void _endhosthtent() { if (hostf && !stayopen) { (void) fclose(hostf); hostf = NULL; } } struct hostent * gethostent() { char *p; register char *cp, **q; int af, len; if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { h_errno = NETDB_INTERNAL; return (NULL); } again: if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { h_errno = HOST_NOT_FOUND; return (NULL); } if (*p == '#') goto again; if (!(cp = strpbrk(p, "#\n"))) goto again; *cp = '\0'; if (!(cp = strpbrk(p, " \t"))) goto again; *cp++ = '\0'; if (inet_pton(AF_INET6, p, host_addr) > 0) { af = AF_INET6; len = IN6ADDRSZ; } else if (inet_pton(AF_INET, p, host_addr) > 0) { if (_res.options & RES_USE_INET6) { _map_v4v6_address((char*)host_addr, (char*)host_addr); af = AF_INET6; len = IN6ADDRSZ; } else { af = AF_INET; len = INADDRSZ; } } else { goto again; } h_addr_ptrs[0] = (char *)host_addr; h_addr_ptrs[1] = NULL; host.h_addr_list = h_addr_ptrs; host.h_length = len; host.h_addrtype = af; while (*cp == ' ' || *cp == '\t') cp++; host.h_name = cp; q = host.h_aliases = host_aliases; if ((cp = strpbrk(cp, " \t")) != NULL) *cp++ = '\0'; while (cp && *cp) { if (*cp == ' ' || *cp == '\t') { cp++; continue; } if (q < &host_aliases[MAXALIASES - 1]) *q++ = cp; if ((cp = strpbrk(cp, " \t")) != NULL) *cp++ = '\0'; } *q = NULL; h_errno = NETDB_SUCCESS; return (&host); } struct hostent * _gethostbyhtname(name, af) const char *name; int af; { register struct hostent *p; register char **cp; sethostent(0); while ((p = gethostent()) != NULL) { if (p->h_addrtype != af) continue; if (strcasecmp(p->h_name, name) == 0) break; for (cp = p->h_aliases; *cp != 0; cp++) if (strcasecmp(*cp, name) == 0) goto found; } found: endhostent(); return (p); } struct hostent * _gethostbyhtaddr(addr, len, af) const char *addr; int len, af; { register struct hostent *p; sethostent(0); while ((p = gethostent()) != NULL) if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) break; endhostent(); return (p); }
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