4.4BSD/usr/src/usr.bin/vacation/vacation.c
/*
* Copyright (c) 1983, 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1983, 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)vacation.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
** Vacation
** Copyright (c) 1983 Eric P. Allman
** Berkeley, California
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>
#include <db.h>
#include <time.h>
#include <syslog.h>
#include <tzfile.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
/*
* VACATION -- return a message to the sender when on vacation.
*
* This program is invoked as a message receiver. It returns a
* message specified by the user to whomever sent the mail, taking
* care not to return a message too often to prevent "I am on
* vacation" loops.
*/
#define MAXLINE 1024 /* max line from mail header */
#define VDB ".vacation.db" /* dbm's database */
#define VMSG ".vacation.msg" /* vacation message */
typedef struct alias {
struct alias *next;
char *name;
} ALIAS;
ALIAS *names;
DB *db;
char from[MAXLINE];
main(argc, argv)
int argc;
char **argv;
{
extern int optind, opterr;
extern char *optarg;
struct passwd *pw;
ALIAS *cur;
time_t interval;
int ch, iflag;
opterr = iflag = 0;
interval = -1;
while ((ch = getopt(argc, argv, "a:Iir:")) != EOF)
switch((char)ch) {
case 'a': /* alias */
if (!(cur = (ALIAS *)malloc((u_int)sizeof(ALIAS))))
break;
cur->name = optarg;
cur->next = names;
names = cur;
break;
case 'I': /* backward compatible */
case 'i': /* init the database */
iflag = 1;
break;
case 'r':
if (isdigit(*optarg)) {
interval = atol(optarg) * SECSPERDAY;
if (interval < 0)
usage();
}
else
interval = LONG_MAX;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 1) {
if (!iflag)
usage();
if (!(pw = getpwuid(getuid()))) {
syslog(LOG_ERR,
"vacation: no such user uid %u.\n", getuid());
exit(1);
}
}
else if (!(pw = getpwnam(*argv))) {
syslog(LOG_ERR, "vacation: no such user %s.\n", *argv);
exit(1);
}
if (chdir(pw->pw_dir)) {
syslog(LOG_NOTICE,
"vacation: no such directory %s.\n", pw->pw_dir);
exit(1);
}
db = dbopen(VDB, O_CREAT|O_RDWR | (iflag ? O_TRUNC : 0),
S_IRUSR|S_IWUSR, DB_HASH, NULL);
if (!db) {
syslog(LOG_NOTICE, "vacation: %s: %s\n", VDB, strerror(errno));
exit(1);
}
if (interval != -1)
setinterval(interval);
if (iflag) {
(void)(db->close)(db);
exit(0);
}
if (!(cur = malloc((u_int)sizeof(ALIAS))))
exit(1);
cur->name = pw->pw_name;
cur->next = names;
names = cur;
readheaders();
if (!recent()) {
setreply();
(void)(db->close)(db);
sendmessage(pw->pw_name);
}
(void)(db->close)(db);
exit(0);
/* NOTREACHED */
}
/*
* readheaders --
* read mail headers
*/
readheaders()
{
register ALIAS *cur;
register char *p;
int tome, cont;
char buf[MAXLINE];
cont = tome = 0;
while (fgets(buf, sizeof(buf), stdin) && *buf != '\n')
switch(*buf) {
case 'F': /* "From " */
cont = 0;
if (!strncmp(buf, "From ", 5)) {
for (p = buf + 5; *p && *p != ' '; ++p);
*p = '\0';
(void)strcpy(from, buf + 5);
if (p = index(from, '\n'))
*p = '\0';
if (junkmail())
exit(0);
}
break;
case 'P': /* "Precedence:" */
cont = 0;
if (strncasecmp(buf, "Precedence", 10) ||
buf[10] != ':' && buf[10] != ' ' && buf[10] != '\t')
break;
if (!(p = index(buf, ':')))
break;
while (*++p && isspace(*p));
if (!*p)
break;
if (!strncasecmp(p, "junk", 4) ||
!strncasecmp(p, "bulk", 4) ||
!strncasecmp(p, "list", 4))
exit(0);
break;
case 'C': /* "Cc:" */
if (strncmp(buf, "Cc:", 3))
break;
cont = 1;
goto findme;
case 'T': /* "To:" */
if (strncmp(buf, "To:", 3))
break;
cont = 1;
goto findme;
default:
if (!isspace(*buf) || !cont || tome) {
cont = 0;
break;
}
findme: for (cur = names; !tome && cur; cur = cur->next)
tome += nsearch(cur->name, buf);
}
if (!tome)
exit(0);
if (!*from) {
syslog(LOG_NOTICE, "vacation: no initial \"From\" line.\n");
exit(1);
}
}
/*
* nsearch --
* do a nice, slow, search of a string for a substring.
*/
nsearch(name, str)
register char *name, *str;
{
register int len;
for (len = strlen(name); *str; ++str)
if (*str == *name && !strncasecmp(name, str, len))
return(1);
return(0);
}
/*
* junkmail --
* read the header and return if automagic/junk/bulk/list mail
*/
junkmail()
{
static struct ignore {
char *name;
int len;
} ignore[] = {
"-request", 8, "postmaster", 10, "uucp", 4,
"mailer-daemon", 13, "mailer", 6, "-relay", 6,
NULL, NULL,
};
register struct ignore *cur;
register int len;
register char *p;
/*
* This is mildly amusing, and I'm not positive it's right; trying
* to find the "real" name of the sender, assuming that addresses
* will be some variant of:
*
* From site!site!SENDER%site.domain%site.domain@site.domain
*/
if (!(p = index(from, '%')))
if (!(p = index(from, '@'))) {
if (p = rindex(from, '!'))
++p;
else
p = from;
for (; *p; ++p);
}
len = p - from;
for (cur = ignore; cur->name; ++cur)
if (len >= cur->len &&
!strncasecmp(cur->name, p - cur->len, cur->len))
return(1);
return(0);
}
#define VIT "__VACATION__INTERVAL__TIMER__"
/*
* recent --
* find out if user has gotten a vacation message recently.
* use bcopy for machines with alignment restrictions
*/
recent()
{
DBT key, data;
time_t then, next;
/* get interval time */
key.data = VIT;
key.size = sizeof(VIT);
if ((db->get)(db, &key, &data, 0))
next = SECSPERDAY * DAYSPERWEEK;
else
bcopy(data.data, &next, sizeof(next));
/* get record for this address */
key.data = from;
key.size = strlen(from);
if (!(db->get)(db, &key, &data, 0)) {
bcopy(data.data, &then, sizeof(then));
if (next == LONG_MAX || then + next > time(NULL))
return(1);
}
return(0);
}
/*
* setinterval --
* store the reply interval
*/
setinterval(interval)
time_t interval;
{
DBT key, data;
key.data = VIT;
key.size = sizeof(VIT);
data.data = &interval;
data.size = sizeof(interval);
(void)(db->put)(db, &key, &data, 0);
}
/*
* setreply --
* store that this user knows about the vacation.
*/
setreply()
{
DBT key, data;
time_t now;
key.data = from;
key.size = strlen(from);
(void)time(&now);
data.data = &now;
data.size = sizeof(now);
(void)(db->put)(db, &key, &data, 0);
}
/*
* sendmessage --
* exec sendmail to send the vacation file to sender
*/
sendmessage(myname)
char *myname;
{
if (!freopen(VMSG, "r", stdin)) {
syslog(LOG_NOTICE, "vacation: no ~%s/%s file.\n", myname, VMSG);
exit(1);
}
execl(_PATH_SENDMAIL, "sendmail", "-f", myname, from, NULL);
syslog(LOG_ERR, "vacation: can't exec %s.\n", _PATH_SENDMAIL);
exit(1);
}
usage()
{
syslog(LOG_NOTICE, "uid %u: usage: vacation [-i] [-a alias] login\n",
getuid());
exit(1);
}