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+/*
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+** services.c /etc/services access functions
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+**
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+** This file is part of the NYS Library.
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+**
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+** The NYS Library is free software; you can redistribute it and/or
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+** modify it under the terms of the GNU Library General Public License as
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+** published by the Free Software Foundation; either version 2 of the
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+** License, or (at your option) any later version.
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+**
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+** The NYS Library is distributed in the hope that it will be useful,
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+** but WITHOUT ANY WARRANTY; without even the implied warranty of
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+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+** Library General Public License for more details.
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+**
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+** You should have received a copy of the GNU Library General Public
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+** License along with the NYS Library; see the file COPYING.LIB. If
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+** not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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+** Cambridge, MA 02139, USA.
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+**
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+**
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+** Copyright (c) 1983 Regents of the University of California.
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+** All rights reserved.
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+**
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+** Redistribution and use in source and binary forms, with or without
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+** modification, are permitted provided that the following conditions
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+** are met:
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+** 1. Redistributions of source code must retain the above copyright
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+** notice, this list of conditions and the following disclaimer.
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+** 2. Redistributions in binary form must reproduce the above copyright
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+** notice, this list of conditions and the following disclaimer in the
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+** documentation and/or other materials provided with the distribution.
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+** 3. All advertising materials mentioning features or use of this software
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+** must display the following acknowledgement:
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+** This product includes software developed by the University of
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+** California, Berkeley and its contributors.
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+** 4. Neither the name of the University nor the names of its contributors
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+** may be used to endorse or promote products derived from this software
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+** without specific prior written permission.
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+**
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+** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+** SUCH DAMAGE.
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+*/
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+
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+
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+#include <sys/types.h>
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+#include <sys/socket.h>
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+#include <netdb.h>
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+#include <stdio.h>
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+#include <string.h>
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+#include <stdlib.h>
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+#include <netinet/in.h>
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+#include <arpa/inet.h>
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+
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+#define MAXALIASES 35
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+
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+static FILE *servf = NULL;
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+static char line[BUFSIZ+1];
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+static struct servent serv;
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+static char *serv_aliases[MAXALIASES];
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+static int serv_stayopen;
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+
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+void setservent(int f)
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+{
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+ if (servf == NULL)
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+ servf = fopen(_PATH_SERVICES, "r" );
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+ else
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+ rewind(servf);
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+ serv_stayopen |= f;
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+}
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+
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+void endservent(void)
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+{
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+ if (servf) {
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+ fclose(servf);
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+ servf = NULL;
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+ }
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+ serv_stayopen = 0;
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+}
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+
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+struct servent * getservent(void)
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+{
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+ char *p;
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+ register char *cp, **q;
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+
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+ if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)
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+ return (NULL);
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+again:
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+ if ((p = fgets(line, BUFSIZ, servf)) == NULL)
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+ return (NULL);
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+ if (*p == '#')
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+ goto again;
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+ cp = strpbrk(p, "#\n");
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+ if (cp == NULL)
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+ goto again;
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+ *cp = '\0';
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+ serv.s_name = p;
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+ p = strpbrk(p, " \t");
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+ if (p == NULL)
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+ goto again;
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+ *p++ = '\0';
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+ while (*p == ' ' || *p == '\t')
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+ p++;
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+ cp = strpbrk(p, ",/");
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+ if (cp == NULL)
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+ goto again;
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+ *cp++ = '\0';
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+ serv.s_port = htons((u_short)atoi(p));
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+ serv.s_proto = cp;
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+ q = serv.s_aliases = serv_aliases;
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+ cp = strpbrk(cp, " \t");
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+ if (cp != NULL)
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+ *cp++ = '\0';
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+ while (cp && *cp) {
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+ if (*cp == ' ' || *cp == '\t') {
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+ cp++;
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+ continue;
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+ }
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+ if (q < &serv_aliases[MAXALIASES - 1])
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+ *q++ = cp;
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+ cp = strpbrk(cp, " \t");
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+ if (cp != NULL)
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+ *cp++ = '\0';
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+ }
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+ *q = NULL;
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+ return (&serv);
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+}
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+
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+
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+struct servent *getservbyname(const char *name, const char *proto)
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+{
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+ register struct servent *p;
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+ register char **cp;
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+
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+ setservent(serv_stayopen);
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+ while ((p = getservent()) != NULL) {
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+ if (strcmp(name, p->s_name) == 0)
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+ goto gotname;
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+ for (cp = p->s_aliases; *cp; cp++)
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+ if (strcmp(name, *cp) == 0)
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+ goto gotname;
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+ continue;
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+gotname:
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+ if (proto == 0 || strcmp(p->s_proto, proto) == 0)
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+ break;
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+ }
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+ if (!serv_stayopen)
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+ endservent();
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+ return (p);
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+}
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+
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+
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+struct servent * getservbyport(int port, const char *proto)
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+{
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+ register struct servent *p;
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+
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+ setservent(serv_stayopen);
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+ while ((p = getservent()) != NULL) {
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+ if (p->s_port != port)
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+ continue;
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+ if (proto == 0 || strcmp(p->s_proto, proto) == 0)
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+ break;
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+ }
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+ if (!serv_stayopen)
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+ endservent();
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+ return (p);
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+}
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Eric Andersen