diff options
Diffstat (limited to 'libc/inet/getproto.c')
| -rw-r--r-- | libc/inet/getproto.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/libc/inet/getproto.c b/libc/inet/getproto.c new file mode 100644 index 000000000..95306b0f3 --- /dev/null +++ b/libc/inet/getproto.c @@ -0,0 +1,164 @@ +/* +** protocols.c /etc/protocols access functions +** +** This file is part of the NYS Library. +** +** The NYS Library is free software; you can redistribute it and/or +** modify it under the terms of the GNU Library General Public License as +** published by the Free Software Foundation; either version 2 of the +** License, or (at your option) any later version. +** +** The NYS Library is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +** Library General Public License for more details. +** +** You should have received a copy of the GNU Library General Public +** License along with the NYS Library; see the file COPYING.LIB. If +** not, write to the Free Software Foundation, Inc., 675 Mass Ave, +** Cambridge, MA 02139, USA. +** +** +** Copyright (c) 1983 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. +*/ + +#include <sys/types.h> +#include <sys/socket.h> +#include <netdb.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#define MAXALIASES 35 + +static FILE *protof = NULL; +static char line[BUFSIZ+1]; +static struct protoent proto; +static char *proto_aliases[MAXALIASES]; +static int proto_stayopen; + +void setprotoent(int f) +{ + if (protof == NULL) + protof = fopen(_PATH_PROTOCOLS, "r" ); + else + rewind(protof); + proto_stayopen |= f; +} + +void endprotoent(void) +{ + if (protof) { + fclose(protof); + protof = NULL; + } + proto_stayopen = 0; +} + +struct protoent * getprotoent(void) +{ + char *p; + register char *cp, **q; + + if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL) + return (NULL); +again: + if ((p = fgets(line, BUFSIZ, protof)) == NULL) + return (NULL); + if (*p == '#') + goto again; + cp = strpbrk(p, "#\n"); + if (cp == NULL) + goto again; + *cp = '\0'; + proto.p_name = p; + cp = strpbrk(p, " \t"); + if (cp == NULL) + goto again; + *cp++ = '\0'; + while (*cp == ' ' || *cp == '\t') + cp++; + p = strpbrk(cp, " \t"); + if (p != NULL) + *p++ = '\0'; + proto.p_proto = atoi(cp); + q = proto.p_aliases = proto_aliases; + if (p != NULL) { + cp = p; + while (cp && *cp) { + if (*cp == ' ' || *cp == '\t') { + cp++; + continue; + } + if (q < &proto_aliases[MAXALIASES - 1]) + *q++ = cp; + cp = strpbrk(cp, " \t"); + if (cp != NULL) + *cp++ = '\0'; + } + } + *q = NULL; + return (&proto); +} + + +struct protoent * getprotobyname(const char *name) +{ + register struct protoent *p; + register char **cp; + + setprotoent(proto_stayopen); + while ((p = getprotoent()) != NULL) { + if (strcmp(p->p_name, name) == 0) + break; + for (cp = p->p_aliases; *cp != 0; cp++) + if (strcmp(*cp, name) == 0) + goto found; + } +found: + if (!proto_stayopen) + endprotoent(); + return (p); +} + +struct protoent * getprotobynumber(int proto) +{ + register struct protoent *p; + + setprotoent(proto_stayopen); + while ((p = getprotoent()) != NULL) + if (p->p_proto == proto) + break; + if (!proto_stayopen) + endprotoent(); + return (p); +} |