1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)getnetent.c 5.6 (Berkeley) 05/21/90"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <stdio.h> 23 #include <sys/types.h> 24 #include <sys/socket.h> 25 #include <netdb.h> 26 #include <ctype.h> 27 28 #define MAXALIASES 35 29 30 static FILE *netf = NULL; 31 static char line[BUFSIZ+1]; 32 static struct netent net; 33 static char *net_aliases[MAXALIASES]; 34 int _net_stayopen; 35 static char *any(); 36 37 setnetent(f) 38 int f; 39 { 40 if (netf == NULL) 41 netf = fopen(_PATH_NETWORKS, "r" ); 42 else 43 rewind(netf); 44 _net_stayopen |= f; 45 } 46 47 endnetent() 48 { 49 if (netf) { 50 fclose(netf); 51 netf = NULL; 52 } 53 _net_stayopen = 0; 54 } 55 56 struct netent * 57 getnetent() 58 { 59 char *p; 60 register char *cp, **q; 61 62 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 63 return (NULL); 64 again: 65 p = fgets(line, BUFSIZ, netf); 66 if (p == NULL) 67 return (NULL); 68 if (*p == '#') 69 goto again; 70 cp = any(p, "#\n"); 71 if (cp == NULL) 72 goto again; 73 *cp = '\0'; 74 net.n_name = p; 75 cp = any(p, " \t"); 76 if (cp == NULL) 77 goto again; 78 *cp++ = '\0'; 79 while (*cp == ' ' || *cp == '\t') 80 cp++; 81 p = any(cp, " \t"); 82 if (p != NULL) 83 *p++ = '\0'; 84 net.n_net = inet_network(cp); 85 net.n_addrtype = AF_INET; 86 q = net.n_aliases = net_aliases; 87 if (p != NULL) 88 cp = p; 89 while (cp && *cp) { 90 if (*cp == ' ' || *cp == '\t') { 91 cp++; 92 continue; 93 } 94 if (q < &net_aliases[MAXALIASES - 1]) 95 *q++ = cp; 96 cp = any(cp, " \t"); 97 if (cp != NULL) 98 *cp++ = '\0'; 99 } 100 *q = NULL; 101 return (&net); 102 } 103 104 static char * 105 any(cp, match) 106 register char *cp; 107 char *match; 108 { 109 register char *mp, c; 110 111 while (c = *cp) { 112 for (mp = match; *mp; mp++) 113 if (*mp == c) 114 return (cp); 115 cp++; 116 } 117 return ((char *)0); 118 } 119