1 /* $OpenBSD: v7.local.c,v 1.18 2018/09/16 02:38:57 millert Exp $ */ 2 /* $NetBSD: v7.local.c,v 1.8 1997/05/13 06:15:58 mikel Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Mail -- a mail program 35 * 36 * Version 7 37 * 38 * Local routines that are installation dependent. 39 */ 40 41 #include "rcv.h" 42 #include <stdlib.h> 43 #include <fcntl.h> 44 #include <pwd.h> 45 #include "extern.h" 46 47 /* 48 * Locate the user's mailbox file (ie, the place where new, unread 49 * mail is queued). 50 */ 51 void 52 findmail(const char *user, char *buf, int buflen) 53 { 54 char *mbox; 55 struct stat sb; 56 57 /* Ignore $MAIL if it is not owned by the invoking user */ 58 if ((mbox = getenv("MAIL")) && stat(mbox, &sb) == 0 && 59 sb.st_uid != getuid() && sb.st_uid != geteuid()) 60 mbox = NULL; 61 62 if (mbox) 63 (void)strlcpy(buf, mbox, buflen); 64 else 65 (void)snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user); 66 } 67 68 /* 69 * Get rid of the queued mail. 70 */ 71 void 72 demail(void) 73 { 74 int fd; 75 76 if (value("keep") != NULL || rm(mailname) < 0) { 77 fd = open(mailname, O_CREAT | O_TRUNC | O_WRONLY, 0600); 78 if (fd != -1) 79 close(fd); 80 } 81 } 82 83 /* 84 * Discover user login name. 85 */ 86 const char * 87 username(void) 88 { 89 const char *np; 90 uid_t uid; 91 92 if ((np = getenv("USER")) != NULL) 93 return(np); 94 if ((np = getenv("LOGNAME")) != NULL) 95 return(np); 96 if ((np = user_from_uid(uid = getuid(), 1)) != NULL) 97 return(np); 98 if ((np = getlogin()) != NULL) 99 return(np); 100 printf("Cannot associate a name with uid %u\n", uid); 101 return(NULL); 102 } 103