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 #include <config.h> 38 39 #include <netdissect-stdinc.h> 40 #include <getservent.h> 41 42 static FILE *servf = NULL; 43 static char line[BUFSIZ+1]; 44 static struct servent serv; 45 static char *serv_aliases[MAXALIASES]; 46 int _serv_stayopen; 47 const char *etc_path(const char *file); 48 49 /* 50 * Check if <file> exists in the current directory and, if so, return it. 51 * Else return either "%SYSTEMROOT%\System32\drivers\etc\<file>" 52 * or $PREFIX/etc/<file>. 53 * "<file>" is aka __PATH_SERVICES (aka "services" on Windows and 54 * "/etc/services" on other platforms that would need this). 55 */ 56 const char *etc_path(const char *file) 57 { 58 const char *env = getenv(__PATH_SYSROOT); 59 static char path[_MAX_PATH]; 60 61 /* see if "<file>" exists locally or whether __PATH_SYSROOT is valid */ 62 if (fopen(file, "r") || !env) 63 return (file); 64 else 65 #ifdef _WIN32 66 snprintf(path, sizeof(path), "%s%s%s", env, __PATH_ETC_INET, file); 67 #else 68 snprintf(path, sizeof(path), "%s%s", env, file); 69 #endif 70 return (path); 71 } 72 73 void 74 setservent(int f) 75 { 76 if (servf == NULL) 77 servf = fopen(etc_path(__PATH_SERVICES), "r"); 78 else 79 rewind(servf); 80 _serv_stayopen |= f; 81 } 82 83 void 84 endservent(void) 85 { 86 if (servf) { 87 fclose(servf); 88 servf = NULL; 89 } 90 _serv_stayopen = 0; 91 } 92 93 struct servent * 94 getservent(void) 95 { 96 char *p; 97 char *cp, **q; 98 99 if (servf == NULL && (servf = fopen(etc_path(__PATH_SERVICES), "r")) == NULL) 100 return (NULL); 101 102 again: 103 if ((p = fgets(line, BUFSIZ, servf)) == NULL) 104 return (NULL); 105 if (*p == '#') 106 goto again; 107 cp = strpbrk(p, "#\n"); 108 if (cp == NULL) 109 goto again; 110 *cp = '\0'; 111 serv.s_name = p; 112 p = strpbrk(p, " \t"); 113 if (p == NULL) 114 goto again; 115 *p++ = '\0'; 116 while (*p == ' ' || *p == '\t') 117 p++; 118 cp = strpbrk(p, ",/"); 119 if (cp == NULL) 120 goto again; 121 *cp++ = '\0'; 122 serv.s_port = htons((u_short)atoi(p)); 123 serv.s_proto = cp; 124 q = serv.s_aliases = serv_aliases; 125 cp = strpbrk(cp, " \t"); 126 if (cp != NULL) 127 *cp++ = '\0'; 128 while (cp && *cp) { 129 if (*cp == ' ' || *cp == '\t') { 130 cp++; 131 continue; 132 } 133 if (q < &serv_aliases[MAXALIASES - 1]) 134 *q++ = cp; 135 cp = strpbrk(cp, " \t"); 136 if (cp != NULL) 137 *cp++ = '\0'; 138 } 139 *q = NULL; 140 return (&serv); 141 } 142