1 /* 2 * Copyright (c) 1983, 1993 The Regents of the University of California. 3 * Copyright (c) 1993 Digital Equipment Corporation. 4 * Copyright (c) 2012 G. Vanem <gvanem@yahoo.no>. 5 * Copyright (c) 2017 Ali Abdulkadir <autostart.ini@gmail.com>. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifdef HAVE_CONFIG_H 38 #include <config.h> 39 #endif 40 41 #include <netdissect-stdinc.h> 42 #include <getservent.h> 43 44 static FILE *servf = NULL; 45 static char line[BUFSIZ+1]; 46 static struct servent serv; 47 static char *serv_aliases[MAXALIASES]; 48 int _serv_stayopen; 49 const char *etc_path(const char *file); 50 51 /* 52 * Check if <file> exists in the current directory and, if so, return it. 53 * Else return either "%SYSTEMROOT%\System32\drivers\etc\<file>" 54 * or $PREFIX/etc/<file>. 55 * "<file>" is aka __PATH_SERVICES (aka "services" on Windows and 56 * "/etc/services" on other platforms that would need this). 57 */ 58 const char *etc_path(const char *file) 59 { 60 const char *env = getenv(__PATH_SYSROOT); 61 static char path[_MAX_PATH]; 62 63 /* see if "<file>" exists locally or whether __PATH_SYSROOT is valid */ 64 if (fopen(file, "r") || !env) 65 return (file); 66 else 67 #ifdef _WIN32 68 snprintf(path, sizeof(path), "%s%s%s", env, __PATH_ETC_INET, file); 69 #else 70 snprintf(path, sizeof(path), "%s%s", env, file); 71 #endif 72 return (path); 73 } 74 75 void 76 setservent(int f) 77 { 78 if (servf == NULL) 79 servf = fopen(etc_path(__PATH_SERVICES), "r"); 80 else 81 rewind(servf); 82 _serv_stayopen |= f; 83 } 84 85 void 86 endservent(void) 87 { 88 if (servf) { 89 fclose(servf); 90 servf = NULL; 91 } 92 _serv_stayopen = 0; 93 } 94 95 struct servent * 96 getservent(void) 97 { 98 char *p; 99 char *cp, **q; 100 101 if (servf == NULL && (servf = fopen(etc_path(__PATH_SERVICES), "r")) == NULL) 102 return (NULL); 103 104 again: 105 if ((p = fgets(line, BUFSIZ, servf)) == NULL) 106 return (NULL); 107 if (*p == '#') 108 goto again; 109 cp = strpbrk(p, "#\n"); 110 if (cp == NULL) 111 goto again; 112 *cp = '\0'; 113 serv.s_name = p; 114 p = strpbrk(p, " \t"); 115 if (p == NULL) 116 goto again; 117 *p++ = '\0'; 118 while (*p == ' ' || *p == '\t') 119 p++; 120 cp = strpbrk(p, ",/"); 121 if (cp == NULL) 122 goto again; 123 *cp++ = '\0'; 124 serv.s_port = htons((u_short)atoi(p)); 125 serv.s_proto = cp; 126 q = serv.s_aliases = serv_aliases; 127 cp = strpbrk(cp, " \t"); 128 if (cp != NULL) 129 *cp++ = '\0'; 130 while (cp && *cp) { 131 if (*cp == ' ' || *cp == '\t') { 132 cp++; 133 continue; 134 } 135 if (q < &serv_aliases[MAXALIASES - 1]) 136 *q++ = cp; 137 cp = strpbrk(cp, " \t"); 138 if (cp != NULL) 139 *cp++ = '\0'; 140 } 141 *q = NULL; 142 return (&serv); 143 } 144