1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: getprotoent.c,v 1.5 2003/06/02 20:18:35 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 #include <netdb.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 41 #define MAXALIASES 35 42 43 static FILE *protof = NULL; 44 static char line[BUFSIZ+1]; 45 static struct protoent proto; 46 static char *proto_aliases[MAXALIASES]; 47 int _proto_stayopen; 48 49 void 50 setprotoent(f) 51 int f; 52 { 53 if (protof == NULL) 54 protof = fopen(_PATH_PROTOCOLS, "r" ); 55 else 56 rewind(protof); 57 _proto_stayopen |= f; 58 } 59 60 void 61 endprotoent() 62 { 63 if (protof) { 64 fclose(protof); 65 protof = NULL; 66 } 67 _proto_stayopen = 0; 68 } 69 70 struct protoent * 71 getprotoent() 72 { 73 char *p, *cp, **q, *endp; 74 long l; 75 size_t len; 76 77 if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL) 78 return (NULL); 79 again: 80 if ((p = fgetln(protof, &len)) == NULL) 81 return (NULL); 82 if (p[len-1] == '\n') 83 len--; 84 if (len >= sizeof(line) || len == 0) 85 goto again; 86 p = memcpy(line, p, len); 87 line[len] = '\0'; 88 if (*p == '#') 89 goto again; 90 if ((cp = strchr(p, '#')) != NULL) 91 *cp = '\0'; 92 proto.p_name = p; 93 cp = strpbrk(p, " \t"); 94 if (cp == NULL) 95 goto again; 96 *cp++ = '\0'; 97 while (*cp == ' ' || *cp == '\t') 98 cp++; 99 p = strpbrk(cp, " \t"); 100 if (p != NULL) 101 *p++ = '\0'; 102 l = strtol(cp, &endp, 10); 103 if (endp == cp || *endp != '\0' || l < 0 || l >= INT_MAX) 104 goto again; 105 proto.p_proto = l; 106 q = proto.p_aliases = proto_aliases; 107 if (p != NULL) { 108 cp = p; 109 while (cp && *cp) { 110 if (*cp == ' ' || *cp == '\t') { 111 cp++; 112 continue; 113 } 114 if (q < &proto_aliases[MAXALIASES - 1]) 115 *q++ = cp; 116 cp = strpbrk(cp, " \t"); 117 if (cp != NULL) 118 *cp++ = '\0'; 119 } 120 } 121 *q = NULL; 122 return (&proto); 123 } 124