650 lines
14 KiB
C
650 lines
14 KiB
C
/* $NetBSD: vacation.c,v 1.30 2004/08/19 13:43:54 christos Exp $ */
|
|
|
|
/*
|
|
* 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. 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1983, 1987, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)vacation.c 8.2 (Berkeley) 1/26/94";
|
|
#endif
|
|
__RCSID("$NetBSD: vacation.c,v 1.30 2004/08/19 13:43:54 christos Exp $");
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
** Vacation
|
|
** Copyright (c) 1983 Eric P. Allman
|
|
** Berkeley, California
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <ctype.h>
|
|
#include <db.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <paths.h>
|
|
#include <pwd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <time.h>
|
|
#include <tzfile.h>
|
|
#include <unistd.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 */
|
|
|
|
static const char *dbprefix = ".vacation"; /* dbm's database sans .db */
|
|
static const char *msgfile = ".vacation.msg"; /* vacation message */
|
|
|
|
typedef struct alias {
|
|
struct alias *next;
|
|
const char *name;
|
|
} alias_t;
|
|
static alias_t *names;
|
|
|
|
static DB *db;
|
|
static char from[MAXLINE];
|
|
static char subject[MAXLINE];
|
|
|
|
static int iflag = 0; /* Initialize the database */
|
|
|
|
static int tflag = 0;
|
|
#define APPARENTLY_TO 1
|
|
#define DELIVERED_TO 2
|
|
|
|
static int fflag = 0;
|
|
#define FROM_FROM 1
|
|
#define RETURN_PATH_FROM 2
|
|
#define SENDER_FROM 4
|
|
|
|
static int toanybody = 0; /* Don't check if we appear in the to or cc */
|
|
|
|
static int debug = 0;
|
|
|
|
int main(int, char **);
|
|
static void opendb(void);
|
|
static int junkmail(const char *);
|
|
static int nsearch(const char *, const char *);
|
|
static int readheaders(void);
|
|
static int recent(void);
|
|
static void getfrom(char *);
|
|
static void sendmessage(const char *);
|
|
static void setinterval(time_t);
|
|
static void setreply(void);
|
|
static void usage(void);
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct passwd *pw;
|
|
alias_t *cur;
|
|
long interval;
|
|
int ch, rv;
|
|
char *p;
|
|
|
|
setprogname(argv[0]);
|
|
opterr = 0;
|
|
interval = -1;
|
|
openlog(getprogname(), 0, LOG_USER);
|
|
while ((ch = getopt(argc, argv, "a:df:F:Iijr:s:t:T:")) != -1)
|
|
switch((char)ch) {
|
|
case 'a': /* alias */
|
|
if (!(cur = (alias_t *)malloc((size_t)sizeof(alias_t))))
|
|
break;
|
|
cur->name = optarg;
|
|
cur->next = names;
|
|
names = cur;
|
|
break;
|
|
case 'd':
|
|
debug++;
|
|
break;
|
|
case 'F':
|
|
for (p = optarg; *p; p++)
|
|
switch (*p) {
|
|
case 'F':
|
|
fflag |= FROM_FROM;
|
|
break;
|
|
case 'R':
|
|
fflag |= RETURN_PATH_FROM;
|
|
break;
|
|
case 'S':
|
|
fflag |= SENDER_FROM;
|
|
break;
|
|
default:
|
|
errx(1, "Unknown -f option `%c'", *p);
|
|
}
|
|
break;
|
|
case 'f':
|
|
dbprefix = optarg;
|
|
break;
|
|
case 'I': /* backward compatible */
|
|
case 'i': /* init the database */
|
|
iflag = 1;
|
|
break;
|
|
case 'j':
|
|
toanybody = 1;
|
|
break;
|
|
case 'm':
|
|
msgfile = optarg;
|
|
break;
|
|
case 'r':
|
|
case 't': /* Solaris compatibility */
|
|
if (!isdigit((unsigned char)*optarg)) {
|
|
interval = LONG_MAX;
|
|
break;
|
|
}
|
|
if (*optarg == '\0')
|
|
goto bad;
|
|
interval = strtol(optarg, &p, 0);
|
|
if (errno == ERANGE &&
|
|
(interval == LONG_MAX || interval == LONG_MIN))
|
|
err(1, "Bad interval `%s'", optarg);
|
|
switch (*p) {
|
|
case 's':
|
|
break;
|
|
case 'm':
|
|
interval *= SECSPERMIN;
|
|
break;
|
|
case 'h':
|
|
interval *= SECSPERHOUR;
|
|
break;
|
|
case 'd':
|
|
case '\0':
|
|
interval *= SECSPERDAY;
|
|
break;
|
|
case 'w':
|
|
interval *= DAYSPERWEEK * SECSPERDAY;
|
|
break;
|
|
default:
|
|
bad:
|
|
errx(1, "Invalid interval `%s'", optarg);
|
|
}
|
|
if (interval < 0 || (*p && p[1]))
|
|
goto bad;
|
|
break;
|
|
case 's':
|
|
(void)strlcpy(from, optarg, sizeof(from));
|
|
break;
|
|
case 'T':
|
|
for (p = optarg; *p; p++)
|
|
switch (*p) {
|
|
case 'A':
|
|
tflag |= APPARENTLY_TO;
|
|
break;
|
|
case 'D':
|
|
tflag |= DELIVERED_TO;
|
|
break;
|
|
default:
|
|
errx(1, "Unknown -t option `%c'", *p);
|
|
}
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc != 1) {
|
|
if (!iflag)
|
|
usage();
|
|
if (!(pw = getpwuid(getuid()))) {
|
|
syslog(LOG_ERR, "%s: no such user uid %u.",
|
|
getprogname(), getuid());
|
|
exit(1);
|
|
}
|
|
}
|
|
else if (!(pw = getpwnam(*argv))) {
|
|
syslog(LOG_ERR, "%s: no such user %s.",
|
|
getprogname(), *argv);
|
|
exit(1);
|
|
}
|
|
if (chdir(pw->pw_dir)) {
|
|
syslog(LOG_ERR, "%s: no such directory %s.",
|
|
getprogname(), pw->pw_dir);
|
|
exit(1);
|
|
}
|
|
|
|
opendb();
|
|
|
|
if (interval != -1)
|
|
setinterval((time_t)interval);
|
|
|
|
if (iflag) {
|
|
(void)(db->close)(db);
|
|
exit(0);
|
|
}
|
|
|
|
if (!(cur = malloc((size_t)sizeof(alias_t)))) {
|
|
syslog(LOG_ERR, "%s: %m", getprogname());
|
|
(void)(db->close)(db);
|
|
exit(1);
|
|
}
|
|
cur->name = pw->pw_name;
|
|
cur->next = names;
|
|
names = cur;
|
|
|
|
if ((rv = readheaders()) != -1) {
|
|
(void)(db->close)(db);
|
|
exit(rv);
|
|
}
|
|
|
|
if (!recent()) {
|
|
setreply();
|
|
(void)(db->close)(db);
|
|
sendmessage(pw->pw_name);
|
|
}
|
|
else
|
|
(void)(db->close)(db);
|
|
exit(0);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void
|
|
opendb(void)
|
|
{
|
|
char path[MAXPATHLEN];
|
|
|
|
(void)snprintf(path, sizeof(path), "%s.db", dbprefix);
|
|
db = dbopen(path, O_CREAT|O_RDWR | (iflag ? O_TRUNC : 0),
|
|
S_IRUSR|S_IWUSR, DB_HASH, NULL);
|
|
|
|
if (!db) {
|
|
syslog(LOG_ERR, "%s: %s: %m", getprogname(), path);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* readheaders --
|
|
* read mail headers
|
|
*/
|
|
static int
|
|
readheaders(void)
|
|
{
|
|
alias_t *cur;
|
|
char *p;
|
|
int tome, cont;
|
|
char buf[MAXLINE];
|
|
|
|
cont = tome = 0;
|
|
#define COMPARE(a, b) strncmp(a, b, sizeof(b) - 1)
|
|
#define CASECOMPARE(a, b) strncasecmp(a, b, sizeof(b) - 1)
|
|
while (fgets(buf, sizeof(buf), stdin) && *buf != '\n')
|
|
switch(*buf) {
|
|
case 'F': /* "From " or "From:" */
|
|
cont = 0;
|
|
if (COMPARE(buf, "From ") == 0)
|
|
getfrom(buf + sizeof("From ") - 1);
|
|
if ((fflag & FROM_FROM) != 0 &&
|
|
COMPARE(buf, "From:") == 0)
|
|
getfrom(buf + sizeof("From:") - 1);
|
|
break;
|
|
case 'P': /* "Precedence:" */
|
|
cont = 0;
|
|
if (CASECOMPARE(buf, "Precedence") != 0 ||
|
|
(buf[10] != ':' && buf[10] != ' ' &&
|
|
buf[10] != '\t'))
|
|
break;
|
|
if ((p = strchr(buf, ':')) == NULL)
|
|
break;
|
|
while (*++p && isspace((unsigned char)*p))
|
|
continue;
|
|
if (!*p)
|
|
break;
|
|
if (CASECOMPARE(p, "junk") == 0 ||
|
|
CASECOMPARE(p, "bulk") == 0||
|
|
CASECOMPARE(p, "list") == 0)
|
|
exit(0);
|
|
break;
|
|
case 'C': /* "Cc:" */
|
|
if (COMPARE(buf, "Cc:"))
|
|
break;
|
|
cont = 1;
|
|
goto findme;
|
|
case 'T': /* "To:" */
|
|
if (COMPARE(buf, "To:"))
|
|
break;
|
|
cont = 1;
|
|
goto findme;
|
|
case 'A': /* "Apparently-To:" */
|
|
if ((tflag & APPARENTLY_TO) == 0 ||
|
|
COMPARE(buf, "Apparently-To:") != 0)
|
|
break;
|
|
cont = 1;
|
|
goto findme;
|
|
case 'D': /* "Delivered-To:" */
|
|
if ((tflag & DELIVERED_TO) == 0 ||
|
|
COMPARE(buf, "Delivered-To:") != 0)
|
|
break;
|
|
cont = 1;
|
|
goto findme;
|
|
case 'R': /* "Return-Path:" */
|
|
cont = 0;
|
|
if ((fflag & RETURN_PATH_FROM) != 0 &&
|
|
COMPARE(buf, "Return-Path:") == 0)
|
|
getfrom(buf + sizeof("Return-Path:") - 1);
|
|
break;
|
|
case 'S': /* "Sender:" */
|
|
cont = 0;
|
|
if (COMPARE(buf, "Subject:") == 0) {
|
|
/* trim leading blanks */
|
|
char *s = NULL;
|
|
for (p = buf + sizeof("Subject:") - 1; *p; p++)
|
|
if (s == NULL &&
|
|
!isspace((unsigned char)*p))
|
|
s = p;
|
|
/* trim trailing blanks */
|
|
if (s) {
|
|
for (--p; p != s; p--)
|
|
if (!isspace((unsigned char)*p))
|
|
break;
|
|
*++p = '\0';
|
|
}
|
|
(void)strlcpy(subject, s, sizeof(subject));
|
|
}
|
|
if ((fflag & SENDER_FROM) != 0 &&
|
|
COMPARE(buf, "Sender:") == 0)
|
|
getfrom(buf + sizeof("Sender:") - 1);
|
|
break;
|
|
default:
|
|
if (!isspace((unsigned char)*buf) || !cont || tome) {
|
|
cont = 0;
|
|
break;
|
|
}
|
|
findme: for (cur = names; !tome && cur; cur = cur->next)
|
|
tome += nsearch(cur->name, buf);
|
|
}
|
|
if (!toanybody && !tome)
|
|
return 0;
|
|
if (!*from) {
|
|
syslog(LOG_ERR, "%s: no initial \"From\" line.",
|
|
getprogname());
|
|
return 1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* nsearch --
|
|
* do a nice, slow, search of a string for a substring.
|
|
*/
|
|
static int
|
|
nsearch(const char *name, const char *str)
|
|
{
|
|
size_t len;
|
|
|
|
for (len = strlen(name); *str; ++str)
|
|
if (!strncasecmp(name, str, len))
|
|
return(1);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* getfrom --
|
|
* return the first string in the buffer, stripping leading and trailing
|
|
* blanks and <>.
|
|
*/
|
|
void
|
|
getfrom(char *buf)
|
|
{
|
|
char *s, *p;
|
|
|
|
if ((s = strchr(buf, '<')) != NULL)
|
|
s++;
|
|
else
|
|
s = buf;
|
|
|
|
for (; *s && isspace((unsigned char)*s); s++)
|
|
continue;
|
|
for (p = s; *p && !isspace((unsigned char)*p); p++)
|
|
continue;
|
|
|
|
if (*--p == '>')
|
|
*p = '\0';
|
|
else
|
|
*++p = '\0';
|
|
|
|
if (junkmail(s))
|
|
exit(0);
|
|
|
|
if (!*from)
|
|
(void)strlcpy(from, s, sizeof(from));
|
|
}
|
|
|
|
/*
|
|
* junkmail --
|
|
* read the header and return if automagic/junk/bulk/list mail
|
|
*/
|
|
static int
|
|
junkmail(const char *addr)
|
|
{
|
|
static struct ignore {
|
|
const char *name;
|
|
size_t len;
|
|
} ignore[] = {
|
|
#define INIT(a) { a, sizeof(a) - 1 }
|
|
INIT("-request"),
|
|
INIT("postmaster"),
|
|
INIT("uucp"),
|
|
INIT("mailer-daemon"),
|
|
INIT("mailer"),
|
|
INIT("-relay"),
|
|
{NULL, 0 }
|
|
};
|
|
struct ignore *cur;
|
|
size_t len;
|
|
const 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 = strchr(addr, '%')))
|
|
if (!(p = strchr(addr, '@'))) {
|
|
if ((p = strrchr(addr, '!')) != NULL)
|
|
++p;
|
|
else
|
|
p = addr;
|
|
for (; *p; ++p)
|
|
continue;
|
|
}
|
|
len = p - addr;
|
|
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 memmove for machines with alignment restrictions
|
|
*/
|
|
static int
|
|
recent(void)
|
|
{
|
|
DBT key, data;
|
|
time_t then, next;
|
|
|
|
/* get interval time */
|
|
key.data = (void *)(intptr_t)VIT;
|
|
key.size = sizeof(VIT);
|
|
if ((db->get)(db, &key, &data, 0))
|
|
next = SECSPERDAY * DAYSPERWEEK;
|
|
else
|
|
(void)memmove(&next, data.data, sizeof(next));
|
|
|
|
/* get record for this address */
|
|
key.data = from;
|
|
key.size = strlen(from);
|
|
if (!(db->get)(db, &key, &data, 0)) {
|
|
(void)memmove(&then, data.data, sizeof(then));
|
|
if (next == (time_t)LONG_MAX || /* XXX */
|
|
then + next > time(NULL))
|
|
return(1);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* setinterval --
|
|
* store the reply interval
|
|
*/
|
|
static void
|
|
setinterval(time_t interval)
|
|
{
|
|
DBT key, data;
|
|
|
|
key.data = (void *)(intptr_t)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.
|
|
*/
|
|
static void
|
|
setreply(void)
|
|
{
|
|
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
|
|
*/
|
|
static void
|
|
sendmessage(const char *myname)
|
|
{
|
|
FILE *mfp, *sfp;
|
|
int i;
|
|
int pvect[2];
|
|
char buf[MAXLINE];
|
|
|
|
mfp = fopen(msgfile, "r");
|
|
if (mfp == NULL) {
|
|
syslog(LOG_ERR, "%s: no `%s' file for `%s'.", getprogname(),
|
|
myname, msgfile);
|
|
exit(1);
|
|
}
|
|
|
|
if (debug) {
|
|
sfp = stdout;
|
|
} else {
|
|
if (pipe(pvect) < 0) {
|
|
syslog(LOG_ERR, "%s: pipe: %m", getprogname());
|
|
exit(1);
|
|
}
|
|
i = vfork();
|
|
if (i < 0) {
|
|
syslog(LOG_ERR, "%s: fork: %m", getprogname());
|
|
exit(1);
|
|
}
|
|
if (i == 0) {
|
|
(void)dup2(pvect[0], 0);
|
|
(void)close(pvect[0]);
|
|
(void)close(pvect[1]);
|
|
(void)close(fileno(mfp));
|
|
(void)execl(_PATH_SENDMAIL, "sendmail", "-f", myname,
|
|
"--", from, NULL);
|
|
syslog(LOG_ERR, "%s: can't exec %s: %m",
|
|
getprogname(), _PATH_SENDMAIL);
|
|
_exit(1);
|
|
}
|
|
(void)close(pvect[0]);
|
|
sfp = fdopen(pvect[1], "w");
|
|
if (sfp == NULL) {
|
|
syslog(LOG_ERR, "%s: can't fdopen %d: %m",
|
|
getprogname(), pvect[1]);
|
|
_exit(1);
|
|
}
|
|
}
|
|
(void)fprintf(sfp, "To: %s\n", from);
|
|
while (fgets(buf, sizeof buf, mfp) != NULL) {
|
|
char *p;
|
|
if ((p = strstr(buf, "$SUBJECT")) != NULL) {
|
|
*p = '\0';
|
|
(void)fputs(buf, sfp);
|
|
(void)fputs(subject, sfp);
|
|
p += sizeof("$SUBJECT") - 1;
|
|
(void)fputs(p, sfp);
|
|
} else
|
|
(void)fputs(buf, sfp);
|
|
}
|
|
(void)fclose(mfp);
|
|
if (sfp != stdout)
|
|
(void)fclose(sfp);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
syslog(LOG_ERR, "uid %u: Usage: %s [-dIij] [-a alias] [-f database_file] [-F F|R|S] [-m message_file] [-s sender] [-t interval] [-T A|D]"
|
|
" login", getuid(), getprogname());
|
|
exit(1);
|
|
}
|