+# include <pwd.h>
+# include <stdio.h>
+# include <sysexits.h>
+# include "useful.h"
+# include "userdbm.h"
+
+static char SccsId[] = "@(#)vacation.c 3.1 %G%";
+
+/*
+** VACATION -- return a message to the sender when on vacation.
+**
+** This program could be invoked as a message receiver
+** when someone is on vacation. It returns a message
+** specified by the user to whoever sent the mail, taking
+** care not to return a message too often to prevent
+** "I am on vacation" loops.
+**
+** Positional Parameters:
+** the user to send to.
+**
+** Flag Parameters:
+** -I initialize the database.
+**
+** Side Effects:
+** A message is sent back to the sender.
+**
+** Author:
+** Eric Allman
+** UCB/INGRES
+*/
+
+# define MAXLINE 256 /* max size of a line */
+# define MAXNAME 128 /* max size of one name */
+
+struct dbrec
+{
+ long sentdate;
+};
+
+main(argc, argv)
+ char **argv;
+{
+ char *from;
+ register char *p;
+ struct passwd *pw;
+ register char *homedir;
+ char buf[MAXLINE];
+ extern struct passwd *getpwnam();
+ extern char *newstr();
+ extern char *getfrom();
+ extern bool knows();
+
+ /* process arguments */
+ while (--argc > 0 && (p = *++argv) != NULL && *p == '-')
+ {
+ switch (*++p)
+ {
+ case 'I': /* initialize */
+ homedir = getenv("HOME");
+ if (homedir == NULL)
+ syserr("No home!");
+ strcpy(buf, homedir);
+ strcat(buf, "/.vacation.dir");
+ if (close(creat(buf, 0644)) < 0)
+ syserr("Cannot create %s", buf);
+ strcpy(buf, homedir);
+ strcat(buf, "/.vacation.pag");
+ if (close(creat(buf, 0644)) < 0)
+ syserr("Cannot create %s", buf);
+ exit(EX_OK);
+
+ default:
+ usrerr("Unknown flag -%s", p);
+ exit(EX_USAGE);
+ }
+ }
+
+ /* verify recipient argument */
+ if (argc != 1)
+ {
+ usrerr("Usage: vacation username (or) vacation -I");
+ exit(EX_USAGE);
+ }
+
+ /* find user's home directory */
+ pw = getpwnam(p);
+ if (pw == NULL)
+ {
+ usrerr("Unknown user %s", p);
+ exit(EX_NOUSER);
+ }
+ homedir = newstr(pw->pw_dir);
+ strcpy(buf, homedir);
+ strcat(buf, "/.vacation");
+ dbminit(buf);
+
+ /* read message from standard input (just from line) */
+ from = getfrom();
+
+ /* check if this person is already informed */
+ if (!knows(from))
+ {
+ /* mark this person as knowing */
+ setknows(from, buf);
+
+ /* send the message back */
+ strcat(buf, ".msg");
+ sendmessage(buf, from);
+ /* never returns */
+ }
+}
+\f/*
+** GETFROM -- read message from standard input and return sender
+**
+** Parameters:
+** none.
+**
+** Returns:
+** pointer to the sender address.
+**
+** Side Effects:
+** Reads first line from standard input.
+*/
+
+char *
+getfrom()
+{
+ static char line[MAXLINE];
+ register char *p;
+
+ /* read the from line */
+ if (fgets(line, sizeof line, stdin) == NULL ||
+ strncmp(line, "From ", 5) != NULL)
+ {
+ usrerr("No initial From line");
+ exit(EX_USAGE);
+ }
+
+ /* find the end of the sender address and terminate it */
+ p = index(&line[5], ' ');
+ if (p == NULL)
+ {
+ usrerr("Funny From line '%s'", line);
+ exit(EX_USAGE);
+ }
+ *p = '\0';
+
+ /* return the sender address */
+ return (&line[5]);
+}
+\f/*
+** KNOWS -- predicate telling if user has already been informed.
+**
+** Parameters:
+** user -- the user who sent this message.
+**
+** Returns:
+** TRUE if 'user' has already been informed that the
+** recipient is on vacation.
+** FALSE otherwise.
+**
+** Side Effects:
+** none.
+*/
+
+# define ONEWEEK (60L*60L*24L*7L)
+
+bool
+knows(user)
+ char *user;
+{
+ DATUM k, d;
+ long now;
+
+ time(&now);
+ k.dptr = user;
+ k.dsize = strlen(user) + 1;
+ d = fetch(k);
+ if (d.dptr == NULL || ((struct dbrec *) d.dptr)->sentdate + ONEWEEK < now)
+ return (FALSE);
+ return (TRUE);
+}
+\f/*
+** SETKNOWS -- set that this user knows about the vacation.
+**
+** Parameters:
+** user -- the user who should be marked.
+**
+** Returns:
+** none.
+**
+** Side Effects:
+** The dbm file is updated as appropriate.
+*/
+
+setknows(user)
+ char *user;
+{
+ register int i;
+ DATUM k, d;
+ struct dbrec xrec;
+
+ k.dptr = user;
+ k.dsize = strlen(user) + 1;
+ time(&xrec.sentdate);
+ d.dptr = (char *) &xrec;
+ d.dsize = sizeof xrec;
+ store(k, d);
+}
+\f/*
+** SENDMESSAGE -- send a message to a particular user.
+**
+** Parameters:
+** msgf -- filename containing the message.
+** user -- user who should receive it.
+**
+** Returns:
+** none.
+**
+** Side Effects:
+** sends mail to 'user' using /usr/lib/sendmail.
+*/
+
+sendmessage(msgf, user)
+ char *msgf;
+ char *user;
+{
+ FILE *f;
+
+ /* find the message to send */
+ f = freopen(msgf, "r", stdin);
+ if (f == NULL)
+ {
+ f = freopen("/usr/lib/vacation.def", "r", stdin);
+ if (f == NULL)
+ syserr("No message to send");
+ }
+
+ execl("/usr/lib/sendmail", "sendmail", user, NULL);
+ syserr("Cannot exec /usr/lib/sendmail");
+}
+\f/*
+** USRERR -- print user error
+**
+** Parameters:
+** f -- format.
+** p -- first parameter.
+**
+** Returns:
+** none.
+**
+** Side Effects:
+** none.
+*/
+
+usrerr(f, p)
+ char *f;
+ char *p;
+{
+ fprintf(stderr, "vacation: ");
+ _doprnt(f, &p, stderr);
+ fprintf(stderr, "\n");
+}
+\f/*
+** SYSERR -- print system error
+**
+** Parameters:
+** f -- format.
+** p -- first parameter.
+**
+** Returns:
+** none.
+**
+** Side Effects:
+** none.
+*/
+
+syserr(f, p)
+ char *f;
+ char *p;
+{
+ fprintf(stderr, "vacation: ");
+ _doprnt(f, &p, stderr);
+ fprintf(stderr, "\n");
+ exit(EX_USAGE);
+}
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