655 lines
14 KiB
C
655 lines
14 KiB
C
/* $NetBSD: vacation.c,v 1.34 2007/07/13 14:52:15 christos Exp $ */
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/*
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* Copyright (c) 1983, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1987, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)vacation.c 8.2 (Berkeley) 1/26/94";
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#endif
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__RCSID("$NetBSD: vacation.c,v 1.34 2007/07/13 14:52:15 christos Exp $");
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#endif /* not lint */
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/*
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** Vacation
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** Copyright (c) 1983 Eric P. Allman
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** Berkeley, California
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <db.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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/*
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* VACATION -- return a message to the sender when on vacation.
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*
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* This program is invoked as a message receiver. It returns a
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* message specified by the user to whomever sent the mail, taking
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* care not to return a message too often to prevent "I am on
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* vacation" loops.
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*/
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#define MAXLINE 1024 /* max line from mail header */
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static const char *dbprefix = ".vacation"; /* dbm's database sans .db */
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static const char *msgfile = ".vacation.msg"; /* vacation message */
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typedef struct alias {
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struct alias *next;
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const char *name;
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} alias_t;
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static alias_t *names;
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static DB *db;
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static char from[MAXLINE];
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static char subject[MAXLINE];
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static int iflag = 0; /* Initialize the database */
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static int tflag = 0;
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#define APPARENTLY_TO 1
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#define DELIVERED_TO 2
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static int fflag = 0;
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#define FROM_FROM 1
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#define RETURN_PATH_FROM 2
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#define SENDER_FROM 4
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static int toanybody = 0; /* Don't check if we appear in the to or cc */
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static int debug = 0;
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static void opendb(void);
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static int junkmail(const char *);
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static int nsearch(const char *, const char *);
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static int readheaders(void);
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static int recent(void);
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static void getfrom(char *);
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static void sendmessage(const char *);
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static void setinterval(time_t);
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static void setreply(void);
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static void usage(void) __attribute__((__noreturn__));
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int
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main(int argc, char **argv)
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{
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struct passwd *pw;
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alias_t *cur;
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long interval;
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int ch, rv;
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char *p;
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setprogname(argv[0]);
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opterr = 0;
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interval = -1;
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openlog(getprogname(), 0, LOG_USER);
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while ((ch = getopt(argc, argv, "a:df:F:Iijm:r:s:t:T:")) != -1)
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switch((char)ch) {
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case 'a': /* alias */
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if (!(cur = (alias_t *)malloc((size_t)sizeof(alias_t))))
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break;
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cur->name = optarg;
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cur->next = names;
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names = cur;
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break;
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case 'd':
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debug++;
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break;
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case 'F':
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for (p = optarg; *p; p++)
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switch (*p) {
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case 'F':
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fflag |= FROM_FROM;
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break;
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case 'R':
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fflag |= RETURN_PATH_FROM;
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break;
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case 'S':
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fflag |= SENDER_FROM;
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break;
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default:
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errx(1, "Unknown -f option `%c'", *p);
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}
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break;
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case 'f':
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dbprefix = optarg;
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break;
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case 'I': /* backward compatible */
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case 'i': /* init the database */
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iflag = 1;
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break;
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case 'j':
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toanybody = 1;
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break;
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case 'm':
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msgfile = optarg;
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break;
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case 'r':
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case 't': /* Solaris compatibility */
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if (!isdigit((unsigned char)*optarg)) {
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interval = LONG_MAX;
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break;
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}
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if (*optarg == '\0')
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goto bad;
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interval = strtol(optarg, &p, 0);
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if (errno == ERANGE &&
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(interval == LONG_MAX || interval == LONG_MIN))
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err(1, "Bad interval `%s'", optarg);
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switch (*p) {
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case 's':
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break;
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case 'm':
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interval *= SECSPERMIN;
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break;
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case 'h':
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interval *= SECSPERHOUR;
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break;
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case 'd':
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case '\0':
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interval *= SECSPERDAY;
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break;
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case 'w':
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interval *= DAYSPERWEEK * SECSPERDAY;
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break;
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default:
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bad:
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errx(1, "Invalid interval `%s'", optarg);
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}
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if (interval < 0 || (*p && p[1]))
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goto bad;
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break;
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case 's':
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(void)strlcpy(from, optarg, sizeof(from));
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break;
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case 'T':
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for (p = optarg; *p; p++)
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switch (*p) {
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case 'A':
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tflag |= APPARENTLY_TO;
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break;
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case 'D':
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tflag |= DELIVERED_TO;
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break;
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default:
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errx(1, "Unknown -t option `%c'", *p);
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}
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 1) {
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if (!iflag)
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usage();
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if (!(pw = getpwuid(getuid()))) {
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syslog(LOG_ERR, "%s: no such user uid %u.",
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getprogname(), getuid());
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exit(1);
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}
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}
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else if (!(pw = getpwnam(*argv))) {
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syslog(LOG_ERR, "%s: no such user %s.",
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getprogname(), *argv);
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exit(1);
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}
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if (chdir(pw->pw_dir) == -1 &&
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(dbprefix[0] != '/' || msgfile[0] != '/')) {
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syslog(LOG_ERR, "%s: no such directory %s.",
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getprogname(), pw->pw_dir);
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exit(1);
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}
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opendb();
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if (interval != -1)
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setinterval((time_t)interval);
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if (iflag) {
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(void)(db->close)(db);
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exit(0);
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}
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if (!(cur = malloc((size_t)sizeof(alias_t)))) {
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syslog(LOG_ERR, "%s: %m", getprogname());
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(void)(db->close)(db);
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exit(1);
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}
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cur->name = pw->pw_name;
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cur->next = names;
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names = cur;
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if ((rv = readheaders()) != -1) {
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(void)(db->close)(db);
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exit(rv);
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}
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if (!recent()) {
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setreply();
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(void)(db->close)(db);
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sendmessage(pw->pw_name);
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}
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else
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(void)(db->close)(db);
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exit(0);
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/* NOTREACHED */
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}
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static void
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opendb(void)
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{
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char path[MAXPATHLEN];
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(void)snprintf(path, sizeof(path), "%s.db", dbprefix);
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db = dbopen(path, O_CREAT|O_RDWR | (iflag ? O_TRUNC : 0),
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S_IRUSR|S_IWUSR, DB_HASH, NULL);
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if (!db) {
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syslog(LOG_ERR, "%s: %s: %m", getprogname(), path);
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exit(1);
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}
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}
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/*
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* readheaders --
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* read mail headers
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*/
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static int
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readheaders(void)
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{
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alias_t *cur;
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char *p;
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int tome, cont;
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char buf[MAXLINE];
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cont = tome = 0;
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#define COMPARE(a, b) strncmp(a, b, sizeof(b) - 1)
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#define CASECOMPARE(a, b) strncasecmp(a, b, sizeof(b) - 1)
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while (fgets(buf, sizeof(buf), stdin) && *buf != '\n')
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switch(*buf) {
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case 'F': /* "From " or "From:" */
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cont = 0;
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if (COMPARE(buf, "From ") == 0)
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getfrom(buf + sizeof("From ") - 1);
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if ((fflag & FROM_FROM) != 0 &&
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COMPARE(buf, "From:") == 0)
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getfrom(buf + sizeof("From:") - 1);
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break;
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case 'P': /* "Precedence:" */
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cont = 0;
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if (CASECOMPARE(buf, "Precedence") != 0 ||
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(buf[10] != ':' && buf[10] != ' ' &&
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buf[10] != '\t'))
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break;
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if ((p = strchr(buf, ':')) == NULL)
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break;
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while (*++p && isspace((unsigned char)*p))
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continue;
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if (!*p)
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break;
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if (CASECOMPARE(p, "junk") == 0 ||
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CASECOMPARE(p, "bulk") == 0||
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CASECOMPARE(p, "list") == 0)
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exit(0);
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break;
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case 'C': /* "Cc:" */
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if (COMPARE(buf, "Cc:"))
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break;
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cont = 1;
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goto findme;
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case 'T': /* "To:" */
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if (COMPARE(buf, "To:"))
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break;
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cont = 1;
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goto findme;
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case 'A': /* "Apparently-To:" */
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if ((tflag & APPARENTLY_TO) == 0 ||
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COMPARE(buf, "Apparently-To:") != 0)
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break;
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cont = 1;
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goto findme;
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case 'D': /* "Delivered-To:" */
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if ((tflag & DELIVERED_TO) == 0 ||
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COMPARE(buf, "Delivered-To:") != 0)
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break;
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cont = 1;
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goto findme;
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case 'R': /* "Return-Path:" */
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cont = 0;
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if ((fflag & RETURN_PATH_FROM) != 0 &&
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COMPARE(buf, "Return-Path:") == 0)
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getfrom(buf + sizeof("Return-Path:") - 1);
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break;
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case 'S': /* "Sender:" */
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cont = 0;
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if (COMPARE(buf, "Subject:") == 0) {
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/* trim leading blanks */
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char *s = NULL;
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for (p = buf + sizeof("Subject:") - 1; *p; p++)
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if (s == NULL &&
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!isspace((unsigned char)*p))
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s = p;
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/* trim trailing blanks */
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if (s) {
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for (--p; p != s; p--)
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if (!isspace((unsigned char)*p))
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break;
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*++p = '\0';
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}
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if (s) {
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(void)strlcpy(subject, s, sizeof(subject));
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} else {
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subject[0] = '\0';
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}
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}
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if ((fflag & SENDER_FROM) != 0 &&
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COMPARE(buf, "Sender:") == 0)
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getfrom(buf + sizeof("Sender:") - 1);
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break;
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default:
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if (!isspace((unsigned char)*buf) || !cont || tome) {
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cont = 0;
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break;
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}
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findme: for (cur = names; !tome && cur; cur = cur->next)
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tome += nsearch(cur->name, buf);
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}
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if (!toanybody && !tome)
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return 0;
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if (!*from) {
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syslog(LOG_ERR, "%s: no initial \"From\" line.",
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getprogname());
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return 1;
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}
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return -1;
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}
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/*
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* nsearch --
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* do a nice, slow, search of a string for a substring.
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*/
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static int
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nsearch(const char *name, const char *str)
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{
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size_t len;
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for (len = strlen(name); *str; ++str)
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if (!strncasecmp(name, str, len))
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return(1);
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return(0);
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}
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/*
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* getfrom --
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* return the first string in the buffer, stripping leading and trailing
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* blanks and <>.
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*/
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void
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getfrom(char *buf)
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{
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char *s, *p;
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if ((s = strchr(buf, '<')) != NULL)
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s++;
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else
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s = buf;
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for (; *s && isspace((unsigned char)*s); s++)
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continue;
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for (p = s; *p && !isspace((unsigned char)*p); p++)
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continue;
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if (*--p == '>')
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*p = '\0';
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else
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*++p = '\0';
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if (junkmail(s))
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exit(0);
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if (!*from)
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(void)strlcpy(from, s, sizeof(from));
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}
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/*
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* junkmail --
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* read the header and return if automagic/junk/bulk/list mail
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*/
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static int
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junkmail(const char *addr)
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{
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static struct ignore {
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const char *name;
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size_t len;
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} ignore[] = {
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#define INIT(a) { a, sizeof(a) - 1 }
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INIT("-request"),
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INIT("postmaster"),
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INIT("uucp"),
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INIT("mailer-daemon"),
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INIT("mailer"),
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INIT("-relay"),
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{NULL, 0 }
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};
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struct ignore *cur;
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size_t len;
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const char *p;
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/*
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* This is mildly amusing, and I'm not positive it's right; trying
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* to find the "real" name of the sender, assuming that addresses
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* will be some variant of:
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*
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* From site!site!SENDER%site.domain%site.domain@site.domain
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*/
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if (!(p = strchr(addr, '%')))
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if (!(p = strchr(addr, '@'))) {
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if ((p = strrchr(addr, '!')) != NULL)
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++p;
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else
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p = addr;
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for (; *p; ++p)
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continue;
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}
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len = p - addr;
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for (cur = ignore; cur->name; ++cur)
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if (len >= cur->len &&
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!strncasecmp(cur->name, p - cur->len, cur->len))
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return(1);
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return(0);
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}
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#define VIT "__VACATION__INTERVAL__TIMER__"
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/*
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* recent --
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* find out if user has gotten a vacation message recently.
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* use memmove for machines with alignment restrictions
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*/
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static int
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recent(void)
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{
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DBT key, data;
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time_t then, next;
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/* get interval time */
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key.data = (void *)(intptr_t)VIT;
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key.size = sizeof(VIT);
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if ((db->get)(db, &key, &data, 0))
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next = SECSPERDAY * DAYSPERWEEK;
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else
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(void)memmove(&next, data.data, sizeof(next));
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/* get record for this address */
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key.data = from;
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key.size = strlen(from);
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if (!(db->get)(db, &key, &data, 0)) {
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(void)memmove(&then, data.data, sizeof(then));
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if (next == (time_t)LONG_MAX || /* XXX */
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then + next > time(NULL))
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return(1);
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}
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return(0);
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}
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/*
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* setinterval --
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* store the reply interval
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*/
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static void
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setinterval(time_t interval)
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{
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DBT key, data;
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key.data = (void *)(intptr_t)VIT;
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key.size = sizeof(VIT);
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data.data = &interval;
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data.size = sizeof(interval);
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(void)(db->put)(db, &key, &data, 0);
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}
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|
|
|
/*
|
|
* 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);
|
|
(void)fputs("Auto-Submitted: auto-replied\n", sfp);
|
|
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);
|
|
}
|