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/* $OpenBSD: getnetent.c,v 1.17 2015/01/16 18:20:14 millert Exp $ */ |
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/* |
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* Copyright (c) 1983, 1993 |
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* The Regents of the University of California. 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. 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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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.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 <limits.h> |
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#define MAXALIASES 35 |
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static FILE *netf; |
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static char line[BUFSIZ+1]; |
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static struct netent net; |
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static char *net_aliases[MAXALIASES]; |
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int _net_stayopen; |
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void |
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setnetent(int f) |
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{ |
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if (netf == NULL) |
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netf = fopen(_PATH_NETWORKS, "re" ); |
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else |
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rewind(netf); |
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_net_stayopen |= f; |
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} |
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void |
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endnetent(void) |
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{ |
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if (netf) { |
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fclose(netf); |
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netf = NULL; |
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} |
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_net_stayopen = 0; |
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} |
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struct netent * |
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getnetent(void) |
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{ |
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char *p, *cp, **q; |
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size_t len; |
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if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re" )) == NULL) |
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return (NULL); |
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again: |
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if ((p = fgetln(netf, &len)) == NULL) |
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return (NULL); |
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if (p[len-1] == '\n') |
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len--; |
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if (len >= sizeof(line) || len == 0) |
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goto again; |
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p = memcpy(line, p, len); |
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line[len] = '\0'; |
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if (*p == '#') |
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goto again; |
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if ((cp = strchr(p, '#')) != NULL) |
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*cp = '\0'; |
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net.n_name = p; |
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if (strlen(net.n_name) > HOST_NAME_MAX) |
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net.n_name[HOST_NAME_MAX] = '\0'; |
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cp = strpbrk(p, " \t"); |
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if (cp == NULL) |
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goto again; |
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*cp++ = '\0'; |
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while (*cp == ' ' || *cp == '\t') |
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cp++; |
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p = strpbrk(cp, " \t"); |
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if (p != NULL) |
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*p++ = '\0'; |
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net.n_net = inet_network(cp); |
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net.n_addrtype = AF_INET; |
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q = net.n_aliases = net_aliases; |
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cp = p; |
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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 < &net_aliases[MAXALIASES - 1]) { |
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*q++ = cp; |
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if (strlen(cp) > HOST_NAME_MAX) |
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cp[HOST_NAME_MAX] = '\0'; |
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} |
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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 (&net); |
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} |