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 5.5 (Berkeley) 06/27/88"; 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 char NETDB[] = "/etc/networks"; 31 static FILE *netf = NULL; 32 static char line[BUFSIZ+1]; 33 static struct netent net; 34 static char *net_aliases[MAXALIASES]; 35 int _net_stayopen; 36 static char *any(); 37 38 setnetent(f) 39 int f; 40 { 41 if (netf == NULL) 42 netf = fopen(NETDB, "r" ); 43 else 44 rewind(netf); 45 _net_stayopen |= f; 46 } 47 48 endnetent() 49 { 50 if (netf) { 51 fclose(netf); 52 netf = NULL; 53 } 54 _net_stayopen = 0; 55 } 56 57 struct netent * 58 getnetent() 59 { 60 char *p; 61 register char *cp, **q; 62 63 if (netf == NULL && (netf = fopen(NETDB, "r" )) == NULL) 64 return (NULL); 65 again: 66 p = fgets(line, BUFSIZ, netf); 67 if (p == NULL) 68 return (NULL); 69 if (*p == '#') 70 goto again; 71 cp = any(p, "#\n"); 72 if (cp == NULL) 73 goto again; 74 *cp = '\0'; 75 net.n_name = p; 76 cp = any(p, " \t"); 77 if (cp == NULL) 78 goto again; 79 *cp++ = '\0'; 80 while (*cp == ' ' || *cp == '\t') 81 cp++; 82 p = any(cp, " \t"); 83 if (p != NULL) 84 *p++ = '\0'; 85 net.n_net = inet_network(cp); 86 net.n_addrtype = AF_INET; 87 q = net.n_aliases = net_aliases; 88 if (p != NULL) 89 cp = p; 90 while (cp && *cp) { 91 if (*cp == ' ' || *cp == '\t') { 92 cp++; 93 continue; 94 } 95 if (q < &net_aliases[MAXALIASES - 1]) 96 *q++ = cp; 97 cp = any(cp, " \t"); 98 if (cp != NULL) 99 *cp++ = '\0'; 100 } 101 *q = NULL; 102 return (&net); 103 } 104 105 static char * 106 any(cp, match) 107 register char *cp; 108 char *match; 109 { 110 register char *mp, c; 111 112 while (c = *cp) { 113 for (mp = match; *mp; mp++) 114 if (*mp == c) 115 return (cp); 116 cp++; 117 } 118 return ((char *)0); 119 } 120