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 1.7 2004/10/25 03:09:01 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 37 #include <errno.h> 38 #include <netdb.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 void 44 setprotoent_r(int f, struct protoent_data *pd) 45 { 46 if (pd->fp == NULL) 47 pd->fp = fopen(_PATH_PROTOCOLS, "r" ); 48 else 49 rewind(pd->fp); 50 pd->stayopen |= f; 51 } 52 53 void 54 endprotoent_r(struct protoent_data *pd) 55 { 56 if (pd->fp) { 57 fclose(pd->fp); 58 pd->fp = NULL; 59 } 60 free(pd->aliases); 61 pd->aliases = NULL; 62 pd->maxaliases = 0; 63 free(pd->line); 64 pd->line = NULL; 65 pd->stayopen = 0; 66 } 67 68 int 69 getprotoent_r(struct protoent *pe, struct protoent_data *pd) 70 { 71 char *p, *cp, **q, *endp; 72 size_t len; 73 long l; 74 int serrno; 75 76 if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "r" )) == NULL) 77 return (-1); 78 again: 79 if ((p = fgetln(pd->fp, &len)) == NULL) 80 return (-1); 81 if (len == 0 || *p == '#' || *p == '\n') 82 goto again; 83 if (p[len-1] == '\n') 84 len--; 85 if ((cp = memchr(p, '#', len)) != NULL) 86 len = cp - p; 87 cp = realloc(pd->line, len + 1); 88 if (cp == NULL) 89 return (-1); 90 pd->line = pe->p_name = memcpy(cp, p, len); 91 cp[len] = '\0'; 92 cp = strpbrk(cp, " \t"); 93 if (cp == NULL) 94 goto again; 95 *cp++ = '\0'; 96 while (*cp == ' ' || *cp == '\t') 97 cp++; 98 p = strpbrk(cp, " \t"); 99 if (p != NULL) 100 *p++ = '\0'; 101 l = strtol(cp, &endp, 10); 102 if (endp == cp || *endp != '\0' || l < 0 || l >= INT_MAX) 103 goto again; 104 pe->p_proto = l; 105 if (pd->aliases == NULL) { 106 pd->maxaliases = 5; 107 pd->aliases = malloc(pd->maxaliases * sizeof(char *)); 108 if (pd->aliases == NULL) { 109 serrno = errno; 110 endprotoent_r(pd); 111 errno = serrno; 112 return (-1); 113 } 114 } 115 q = pe->p_aliases = pd->aliases; 116 if (p != NULL) { 117 cp = p; 118 while (cp && *cp) { 119 if (*cp == ' ' || *cp == '\t') { 120 cp++; 121 continue; 122 } 123 if (q == &pe->p_aliases[pd->maxaliases - 1]) { 124 p = realloc(pe->p_aliases, 125 2 * pd->maxaliases * sizeof(char *)); 126 if (p == NULL) { 127 serrno = errno; 128 endprotoent_r(pd); 129 errno = serrno; 130 return (-1); 131 } 132 pd->maxaliases *= 2; 133 q = (char **)p + (q - pe->p_aliases); 134 pe->p_aliases = pd->aliases = (char **)p; 135 } 136 *q++ = cp; 137 cp = strpbrk(cp, " \t"); 138 if (cp != NULL) 139 *cp++ = '\0'; 140 } 141 } 142 *q = NULL; 143 return (0); 144 } 145 146 struct protoent_data _protoent_data; /* shared with getproto{,name}.c */ 147 148 void 149 setprotoent(int f) 150 { 151 setprotoent_r(f, &_protoent_data); 152 } 153 154 void 155 endprotoent(void) 156 { 157 endprotoent_r(&_protoent_data); 158 } 159 160 struct protoent * 161 getprotoent(void) 162 { 163 static struct protoent proto; 164 165 if (getprotoent_r(&proto, &_protoent_data) != 0) 166 return (NULL); 167 return (&proto); 168 } 169