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1fd98d7d88
execvp() in the child branch of a vfork(). Changed to use fork() instead. Some of these (mv, find, apply, xargs) might benefit greatly from being rewritten to use vfork() properly. PR: Loosely related to bin/8252 Approved by: jkh and bde
489 lines
11 KiB
C
489 lines
11 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static const char copyright[] =
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"@(#) 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[] = "@(#)from: vacation.c 8.2 (Berkeley) 1/26/94";
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#endif
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static const char rcsid[] =
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"$Id: vacation.c,v 1.12 1997/11/03 07:51:05 charnier 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 <fcntl.h>
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#include <pwd.h>
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#include <db.h>
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#include <time.h>
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#include <syslog.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <paths.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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#define VDB ".vacation.db" /* dbm's database */
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#define VMSG ".vacation.msg" /* vacation message */
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typedef struct alias {
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struct alias *next;
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char *name;
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} ALIAS;
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ALIAS *names;
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DB *db;
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char from[MAXLINE];
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static int isdelim __P((int));
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static int junkmail __P((void));
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static void listdb __P((void));
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static int nsearch __P((char *, char *));
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static void readheaders __P((void));
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static int recent __P((void));
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static void sendmessage __P((char *));
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static void setinterval __P((time_t));
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static void setreply __P((void));
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static void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern int optind, opterr;
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extern char *optarg;
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struct passwd *pw;
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ALIAS *cur;
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time_t interval;
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int ch, iflag, lflag;
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opterr = iflag = lflag = 0;
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interval = -1;
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while ((ch = getopt(argc, argv, "a:Iilr:")) != -1)
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switch((char)ch) {
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case 'a': /* alias */
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if (!(cur = (ALIAS *)malloc((u_int)sizeof(ALIAS))))
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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 '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 'l':
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lflag = 1; /* list the database */
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break;
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case 'r':
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if (isdigit(*optarg)) {
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interval = atol(optarg) * 86400;
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if (interval < 0)
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usage();
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}
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else
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interval = LONG_MAX;
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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 && !lflag)
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usage();
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if (!(pw = getpwuid(getuid()))) {
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syslog(LOG_ERR,
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"vacation: no such user uid %u.\n", 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, "vacation: no such user %s.\n", *argv);
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exit(1);
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}
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if (chdir(pw->pw_dir)) {
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syslog(LOG_NOTICE,
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"vacation: no such directory %s.\n", pw->pw_dir);
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exit(1);
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}
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db = dbopen(VDB, 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_NOTICE, "vacation: %s: %s\n", VDB, strerror(errno));
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exit(1);
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}
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if (lflag)
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listdb();
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else if (interval != -1)
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setinterval(interval);
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if (iflag || lflag) {
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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((u_int)sizeof(ALIAS))))
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exit(1);
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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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readheaders();
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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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/*
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* readheaders --
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* read mail headers
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*/
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static void
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readheaders()
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{
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register ALIAS *cur;
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register 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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while (fgets(buf, sizeof(buf), stdin) && *buf != '\n')
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switch(*buf) {
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case 'F': /* "From " */
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cont = 0;
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if (!strncmp(buf, "From ", 5)) {
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for (p = buf + 5; *p && *p != ' '; ++p);
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*p = '\0';
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(void)strcpy(from, buf + 5);
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if ((p = index(from, '\n')))
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*p = '\0';
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if (junkmail())
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exit(0);
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}
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break;
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case 'P': /* "Precedence:" */
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cont = 0;
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if (strncasecmp(buf, "Precedence", 10) ||
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(buf[10] != ':' && buf[10] != ' ' && buf[10] != '\t'))
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break;
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if (!(p = index(buf, ':')))
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break;
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while (*++p && isspace(*p));
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if (!*p)
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break;
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if (!strncasecmp(p, "junk", 4) ||
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!strncasecmp(p, "bulk", 4) ||
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!strncasecmp(p, "list", 4))
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exit(0);
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break;
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case 'C': /* "Cc:" */
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if (strncmp(buf, "Cc:", 3))
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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 (strncmp(buf, "To:", 3))
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break;
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cont = 1;
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goto findme;
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default:
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if (!isspace(*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 (!tome)
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exit(0);
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if (!*from) {
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syslog(LOG_NOTICE, "vacation: no initial \"From\" line.\n");
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exit(1);
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}
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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(name, str)
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register char *name, *str;
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{
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register int len;
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for (len = strlen(name); *str; ++str)
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if (*str == *name &&
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!strncasecmp(name, str, len) &&
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isdelim((unsigned char)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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* 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()
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{
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static struct ignore {
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char *name;
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int len;
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} ignore[] = {
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{"-request", 8}, {"postmaster", 10}, {"uucp", 4},
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{"mailer-daemon", 13}, {"mailer", 6}, {"-relay", 6},
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{NULL, 0},
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};
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register struct ignore *cur;
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register int len;
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register 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 = index(from, '%')))
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if (!((p = index(from, '@')))) {
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if ((p = rindex(from, '!')))
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++p;
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else
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p = from;
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for (; *p; ++p);
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}
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len = p - from;
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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 bcopy for machines with alignment restrictions
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*/
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static int
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recent()
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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 = 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 = 86400 * 7;
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else
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bcopy(data.data, &next, 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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bcopy(data.data, &then, sizeof(then));
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if (next == LONG_MAX || 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(interval)
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time_t interval;
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{
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DBT key, data;
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key.data = 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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/*
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* setreply --
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* store that this user knows about the vacation.
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*/
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static void
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setreply()
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{
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DBT key, data;
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time_t now;
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key.data = from;
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key.size = strlen(from);
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(void)time(&now);
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data.data = &now;
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data.size = sizeof(now);
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(void)(db->put)(db, &key, &data, 0);
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}
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/*
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* sendmessage --
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* exec sendmail to send the vacation file to sender
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*/
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static void
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sendmessage(myname)
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char *myname;
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{
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FILE *mfp, *sfp;
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int i;
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int pvect[2];
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char buf[MAXLINE];
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mfp = fopen(VMSG, "r");
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if (mfp == NULL) {
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syslog(LOG_NOTICE, "vacation: no ~%s/%s file.\n", myname, VMSG);
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exit(1);
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}
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if (pipe(pvect) < 0) {
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syslog(LOG_ERR, "vacation: pipe: %s", strerror(errno));
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exit(1);
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}
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i = fork();
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if (i < 0) {
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syslog(LOG_ERR, "vacation: fork: %s", strerror(errno));
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exit(1);
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}
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if (i == 0) {
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dup2(pvect[0], 0);
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close(pvect[0]);
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close(pvect[1]);
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close(fileno(mfp));
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execl(_PATH_SENDMAIL, "sendmail", "-f", myname, "--", from, NULL);
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syslog(LOG_ERR, "vacation: can't exec %s: %s",
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_PATH_SENDMAIL, strerror(errno));
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_exit(1);
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}
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close(pvect[0]);
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sfp = fdopen(pvect[1], "w");
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fprintf(sfp, "To: %s\n", from);
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while (fgets(buf, sizeof buf, mfp))
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fputs(buf, sfp);
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fclose(mfp);
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fclose(sfp);
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}
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static void
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usage()
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{
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syslog(LOG_NOTICE, "uid %u: usage: vacation [-i [-rinterval]] [-l] [-a alias] login\n",
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getuid());
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exit(1);
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}
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static void
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listdb()
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{
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DBT key, data;
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int rv;
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time_t t;
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char user[MAXLINE];
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while((rv = db->seq(db, &key, &data, R_NEXT)) == 0) {
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bcopy(key.data, user, key.size);
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user[key.size] = '\0';
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if (strcmp(user, VIT) == 0)
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continue;
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bcopy(data.data, &t, data.size);
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printf("%-40s %-10s", user, ctime(&t));
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}
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if (rv == -1)
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perror("IO error in database");
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}
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/*
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* Is `c' a delimiting character for a recipient name?
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*/
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static int
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isdelim(c)
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int c;
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{
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/*
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* NB: don't use setlocale() before, headers are supposed to
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* consist only of ASCII (aka. C locale) characters.
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*/
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if (isalnum(c))
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return(0);
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if (c == '_' || c == '-' || c == '.')
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return(0);
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return(1);
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}
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