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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [libnetworking/] [libc/] [getservent.c] - Rev 1765
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/* * Copyright (c) 1983, 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. * * getservent.c,v 1.2 1998/08/20 21:56:23 joel Exp */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)getservent.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #ifdef YP #include <rpc/rpc.h> #include <rpcsvc/yp_prot.h> #include <rpcsvc/ypclnt.h> static int serv_stepping_yp = 0; extern int _yp_check __P(( char ** )); #endif #define MAXALIASES 35 static FILE *servf = NULL; static char line[BUFSIZ+1]; static struct servent serv; static char *serv_aliases[MAXALIASES]; int _serv_stayopen; #ifdef YP char *___getservbyname_yp = NULL; char *___getservbyproto_yp = NULL; int ___getservbyport_yp = 0; static char *yp_domain = NULL; static int _getservbyport_yp(line) char *line; { char *result; int resultlen; char buf[YPMAXRECORD + 2]; int rv; snprintf(buf, sizeof(buf), "%d/%s", ntohs(___getservbyport_yp), ___getservbyproto_yp); ___getservbyport_yp = 0; ___getservbyproto_yp = NULL; if(!yp_domain) { if(yp_get_default_domain(&yp_domain)) return (0); } /* * We have to be a little flexible here. Ideally you're supposed * to have both a services.byname and a services.byport map, but * some systems have only services.byname. FreeBSD cheats a little * by putting the services.byport information in the same map as * services.byname so that either case will work. We allow for both * possibilities here: if there is no services.byport map, we try * services.byname instead. */ if ((rv = yp_match(yp_domain, "services.byport", buf, strlen(buf), &result, &resultlen))) { if (rv == YPERR_MAP) { if (yp_match(yp_domain, "services.byname", buf, strlen(buf), &result, &resultlen)) return(0); } else return(0); } /* getservent() expects lines terminated with \n -- make it happy */ snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); free(result); return(1); } static int _getservbyname_yp(line) char *line; { char *result; int resultlen; char buf[YPMAXRECORD + 2]; if(!yp_domain) { if(yp_get_default_domain(&yp_domain)) return (0); } snprintf(buf, sizeof(buf), "%s/%s", ___getservbyname_yp, ___getservbyproto_yp); ___getservbyname_yp = 0; ___getservbyproto_yp = NULL; if (yp_match(yp_domain, "services.byname", buf, strlen(buf), &result, &resultlen)) { return(0); } /* getservent() expects lines terminated with \n -- make it happy */ snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); free(result); return(1); } static int _getservent_yp(line) char *line; { static char *key = NULL; static int keylen; char *lastkey, *result; int resultlen; int rv; if(!yp_domain) { if(yp_get_default_domain(&yp_domain)) return (0); } if (!serv_stepping_yp) { if (key) free(key); if ((rv = yp_first(yp_domain, "services.byname", &key, &keylen, &result, &resultlen))) { serv_stepping_yp = 0; return(0); } serv_stepping_yp = 1; } else { lastkey = key; rv = yp_next(yp_domain, "services.byname", key, keylen, &key, &keylen, &result, &resultlen); free(lastkey); if (rv) { serv_stepping_yp = 0; return (0); } } /* getservent() expects lines terminated with \n -- make it happy */ snprintf(line, BUFSIZ, "%.*s\n", resultlen, result); free(result); return(1); } #endif void setservent(f) int f; { if (servf == NULL) servf = fopen(_PATH_SERVICES, "r" ); else rewind(servf); _serv_stayopen |= f; } void endservent() { if (servf) { fclose(servf); servf = NULL; } _serv_stayopen = 0; } struct servent * getservent() { char *p; register char *cp, **q; #ifdef YP if (serv_stepping_yp && _getservent_yp(line)) { p = (char *)&line; goto unpack; } tryagain: #endif if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL) return (NULL); again: if ((p = fgets(line, BUFSIZ, servf)) == NULL) return (NULL); #ifdef YP if (*p == '+' && _yp_check(NULL)) { if (___getservbyname_yp != NULL) { if (!_getservbyname_yp(line)) goto tryagain; } else if (___getservbyport_yp != 0) { if (!_getservbyport_yp(line)) goto tryagain; } else if (!_getservent_yp(line)) goto tryagain; } unpack: #endif if (*p == '#') goto again; cp = strpbrk(p, "#\n"); if (cp == NULL) goto again; *cp = '\0'; serv.s_name = p; p = strpbrk(p, " \t"); if (p == NULL) goto again; *p++ = '\0'; while (*p == ' ' || *p == '\t') p++; cp = strpbrk(p, ",/"); if (cp == NULL) goto again; *cp++ = '\0'; serv.s_port = htons((u_short)atoi(p)); serv.s_proto = cp; q = serv.s_aliases = serv_aliases; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; while (cp && *cp) { if (*cp == ' ' || *cp == '\t') { cp++; continue; } if (q < &serv_aliases[MAXALIASES - 1]) *q++ = cp; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; } *q = NULL; return (&serv); }