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Annotation of src/usr.bin/mail/v7.local.c, Revision 1.18

1.18    ! millert     1: /*     $OpenBSD: v7.local.c,v 1.17 2016/07/19 06:43:27 deraadt Exp $   */
1.7       millert     2: /*     $NetBSD: v7.local.c,v 1.8 1997/05/13 06:15:58 mikel Exp $       */
1.2       deraadt     3:
1.1       deraadt     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.
1.14      millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    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>
1.18    ! millert    44: #include <pwd.h>
1.1       deraadt    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
1.18    ! millert    52: findmail(const char *user, char *buf, int buflen)
1.1       deraadt    53: {
                     54:        char *mbox;
1.9       millert    55:        struct stat sb;
1.1       deraadt    56:
1.9       millert    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:
1.13      millert    62:        if (mbox)
                     63:                (void)strlcpy(buf, mbox, buflen);
                     64:        else
1.9       millert    65:                (void)snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user);
1.1       deraadt    66: }
                     67:
                     68: /*
                     69:  * Get rid of the queued mail.
                     70:  */
                     71: void
1.13      millert    72: demail(void)
1.1       deraadt    73: {
1.17      deraadt    74:        int fd;
1.1       deraadt    75:
1.17      deraadt    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:        }
1.1       deraadt    81: }
                     82:
                     83: /*
                     84:  * Discover user login name.
                     85:  */
1.18    ! millert    86: const char *
1.13      millert    87: username(void)
1.1       deraadt    88: {
1.18    ! millert    89:        const char *np;
1.2       deraadt    90:        uid_t uid;
1.1       deraadt    91:
1.8       millert    92:        if ((np = getenv("USER")) != NULL)
1.7       millert    93:                return(np);
1.8       millert    94:        if ((np = getenv("LOGNAME")) != NULL)
1.7       millert    95:                return(np);
1.18    ! millert    96:        if ((np = user_from_uid(uid = getuid(), 1)) != NULL)
1.13      millert    97:                return(np);
                     98:        if ((np = getlogin()) != NULL)
1.7       millert    99:                return(np);
1.18    ! millert   100:        printf("Cannot associate a name with uid %u\n", uid);
1.8       millert   101:        return(NULL);
1.1       deraadt   102: }