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-rw-r--r--usr.bin/vacation/vacation.c420
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+/*
+ * 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 8.2 (Berkeley) 1/26/94";
+#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);
+ }
+ else
+ (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;
+{
+ FILE *mfp, *sfp;
+ int i;
+ int pvect[2];
+ char buf[MAXLINE];
+
+ mfp = fopen(VMSG, "r");
+ if (mfp == NULL) {
+ syslog(LOG_NOTICE, "vacation: no ~%s/%s file.\n", myname, VMSG);
+ exit(1);
+ }
+ if (pipe(pvect) < 0) {
+ syslog(LOG_ERR, "vacation: pipe: %s", strerror(errno));
+ exit(1);
+ }
+ i = vfork();
+ if (i < 0) {
+ syslog(LOG_ERR, "vacation: fork: %s", strerror(errno));
+ exit(1);
+ }
+ if (i == 0) {
+ dup2(pvect[0], 0);
+ close(pvect[0]);
+ close(pvect[1]);
+ fclose(mfp);
+ execl(_PATH_SENDMAIL, "sendmail", "-f", myname, from, NULL);
+ syslog(LOG_ERR, "vacation: can't exec %s: %s",
+ _PATH_SENDMAIL, strerror(errno));
+ exit(1);
+ }
+ close(pvect[0]);
+ sfp = fdopen(pvect[1], "w");
+ fprintf(sfp, "To: %s\n", from);
+ while (fgets(buf, sizeof buf, mfp))
+ fputs(buf, sfp);
+ fclose(mfp);
+ fclose(sfp);
+}
+
+usage()
+{
+ syslog(LOG_NOTICE, "uid %u: usage: vacation [-i] [-a alias] login\n",
+ getuid());
+ exit(1);
+}
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