1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 24 /* All Rights Reserved */ 25 26 /* 27 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 /*LINTLIBRARY*/ 33 34 #include "c_synonyms.h" 35 #include "libmail.h" 36 #include <sys/types.h> 37 #include <ctype.h> 38 #ifdef SVR4 39 #include <sys/utsname.h> 40 #include <sys/systeminfo.h> 41 #endif 42 43 #define NMLN 512 44 #ifdef SVR4 45 #if SYS_NMLN > NMLN 46 #undef NMLN 47 #define NMLN SYS_NMLN 48 #endif 49 #endif 50 51 static char *look4domain(char *, char *, int); 52 static char *readdomain(char *, int); 53 54 /* 55 * NAME 56 * maildomain() - retrieve the domain name 57 * 58 * SYNOPSIS 59 * char *maildomain() 60 * 61 * DESCRIPTION 62 * Retrieve the domain name from xgetenv("DOMAIN"). 63 * If that is not set, look in /etc/resolv.conf, /etc/inet/named.boot 64 * and /etc/named.boot for "^domain[ ]+<domain>". 65 * If that is not set, use sysinfo(SI_SRPC_DOMAIN) from 66 * -lnsl. Otherwise, return an empty string. 67 */ 68 69 /* read a file for the domain */ 70 static char *look4domain(char *file, char *buf, int size) 71 { 72 char *ret = 0; 73 FILE *fp = fopen(file, "r"); 74 75 if (!fp) 76 return (0); 77 78 while (fgets(buf, size, fp)) 79 if (strncmp(buf, "domain", 6) == 0) 80 if (isspace(buf[6])) { 81 char *x = skipspace(buf + 6); 82 if (isgraph(*x)) { 83 trimnl(x); 84 strmove(buf, x); 85 ret = buf; 86 break; 87 } 88 } 89 90 (void) fclose(fp); 91 return (ret); 92 } 93 94 /* read the domain from the xenvironment or one of the files */ 95 static char *readdomain(char *buf, int size) 96 { 97 char *ret; 98 99 if ((ret = xgetenv("DOMAIN")) != 0) { 100 (void) strncpy(buf, ret, size); 101 return (buf); 102 } 103 104 if (((ret = look4domain("/etc/resolv.conf", buf, size)) != 0) || 105 ((ret = look4domain("/etc/inet/named.boot", buf, size)) != 0) || 106 ((ret = look4domain("/etc/named.boot", buf, size)) != 0)) 107 return (ret); 108 109 #ifdef SVR4 110 if (sysinfo(SI_SRPC_DOMAIN, buf, size) >= 0) 111 return (buf); 112 #endif 113 114 return (0); 115 } 116 117 char * 118 maildomain(void) 119 { 120 static char *domain = 0; 121 static char dombuf[NMLN+1] = "."; 122 123 /* if we've already been here, return the info */ 124 if (domain != 0) 125 return (domain); 126 127 domain = readdomain(dombuf+1, NMLN); 128 129 /* Make certain that the domain begins with a single dot */ 130 /* and does not have one at the end. */ 131 if (domain) { 132 size_t len; 133 domain = dombuf; 134 while (*domain && *domain == '.') 135 domain++; 136 domain--; 137 len = strlen(domain); 138 while ((len > 0) && (domain[len-1] == '.')) 139 domain[--len] = '\0'; 140 } 141 /* no domain information */ 142 else 143 domain = ""; 144 145 return (domain); 146 } 147