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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [gethostnamadr.c] - Rev 30
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/*- * Copyright (c) 1994, Garrett Wollman * * 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. * * THIS SOFTWARE IS PROVIDED BY THE 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. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)$Id: gethostnamadr.c,v 1.2 2001-09-27 12:01:53 chris Exp $"; static char rcsid[] = "$Id: gethostnamadr.c,v 1.2 2001-09-27 12:01:53 chris 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 hack for _res */ #include <resolv.h> /* XXX hack for _res */ #define _PATH_HOSTCONF "/etc/host.conf" enum service_type { SERVICE_NONE = 0, SERVICE_BIND, SERVICE_HOSTS, SERVICE_NIS }; #define SERVICE_MAX SERVICE_NIS static struct { const char *name; enum service_type type; } service_names[] = { { "hosts", SERVICE_HOSTS }, { "/etc/hosts", SERVICE_HOSTS }, { "hosttable", SERVICE_HOSTS }, { "htable", SERVICE_HOSTS }, { "bind", SERVICE_BIND }, { "dns", SERVICE_BIND }, { "domain", SERVICE_BIND }, { "yp", SERVICE_NIS }, { "yellowpages", SERVICE_NIS }, { "nis", SERVICE_NIS }, { 0, SERVICE_NONE } }; static enum service_type service_order[SERVICE_MAX + 1]; static int service_done = 0; static enum service_type get_service_name(const char *name) { int i; for(i = 0; service_names[i].type != SERVICE_NONE; i++) { if(!strcasecmp(name, service_names[i].name)) { return service_names[i].type; } } return SERVICE_NONE; } static void init_services() { char *cp, *p, buf[BUFSIZ]; register int cc = 0; FILE *fd; if ((fd = (FILE *)fopen(_PATH_HOSTCONF, "r")) == NULL) { /* make some assumptions */ service_order[0] = SERVICE_BIND; service_order[1] = SERVICE_HOSTS; service_order[2] = SERVICE_NONE; } else { while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) { if(buf[0] == '#') continue; p = buf; while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') ; if (cp == NULL) continue; do { if (isalpha((int)cp[0])) { service_order[cc] = get_service_name(cp); if(service_order[cc] != SERVICE_NONE) cc++; } while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') ; } while(cp != NULL && cc < SERVICE_MAX); } service_order[cc] = SERVICE_NONE; fclose(fd); } service_done = 1; } struct hostent * gethostbyname(const char *name) { struct hostent *hp; if (_res.options & RES_USE_INET6) { /* XXX */ hp = gethostbyname2(name, AF_INET6); /* XXX */ if (hp) /* XXX */ return (hp); /* XXX */ } /* XXX */ return (gethostbyname2(name, AF_INET)); } struct hostent * gethostbyname2(const char *name, int type) { struct hostent *hp = 0; int nserv = 0; if (!service_done) init_services(); while (!hp) { switch (service_order[nserv]) { case SERVICE_NONE: return NULL; case SERVICE_HOSTS: hp = _gethostbyhtname(name, type); break; case SERVICE_BIND: hp = _gethostbydnsname(name, type); break; case SERVICE_NIS: hp = _gethostbynisname(name, type); break; } nserv++; } return hp; } struct hostent * gethostbyaddr(const char *addr, int len, int type) { struct hostent *hp = 0; int nserv = 0; if (!service_done) init_services(); while (!hp) { switch (service_order[nserv]) { case SERVICE_NONE: return 0; case SERVICE_HOSTS: hp = _gethostbyhtaddr(addr, len, type); break; case SERVICE_BIND: hp = _gethostbydnsaddr(addr, len, type); break; case SERVICE_NIS: hp = _gethostbynisaddr(addr, len, type); break; } nserv++; } return hp; } #ifdef _THREAD_SAFE struct hostent_data; /* * Temporary function (not thread safe) */ int gethostbyaddr_r(const char *addr, int len, int type, struct hostent *result, struct hostent_data *buffer) { struct hostent *hp; int ret; if ((hp = gethostbyaddr(addr, len, type)) == NULL) { ret = -1; } else { memcpy(result, hp, sizeof(struct hostent)); ret = 0; } return(ret); } #endif void sethostent(stayopen) int stayopen; { _sethosthtent(stayopen); _sethostdnsent(stayopen); } void endhostent() { _endhosthtent(); _endhostdnsent(); }
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