/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */

#include "mail.h"
/*
 *  NAME
 *      sendlist - send copy to specified users
 *
 *  SYNOPSIS
 *      int sendlist(reciplist *list, int letnum, int level)
 *
 *  DESCRIPTION
 *      sendlist() will traverse the current recipient list and
 *      send a copy of the given letter to each user specified,
 *      invoking send() to do the sending. It returns
 *      1 if the sending fails, 0 otherwise.
 */


/*
 * mailx and mailtool read the SENDMAIL from an environment, since few
 *  people use /bin/mail as their user agent and since /bin/mail is often
 *  called as root or made setuid it's safer to leave this hardwired.
 */

static char *sendmail_prog = SENDMAIL;

static void notifybiff(char *);

int
sendlist(reciplist *list, int letnum, int level)
{
        recip *to;
        int rc = 0;
        FILE *fp;
        int nargs = 4;                  /* "sendmail", "-oi", "--", .. NULL */
        char **argv;
        char **p;

        /* Deliver mail directly to a mailbox */
        if (deliverflag) {
                /*
                 * Note failure to deliver to any one of the recipients
                 * should be considered a failure, so that the user
                 * get's an indication of that failure.
                 */
                for (to = &(list->recip_list); to; to = to->next) {
                        if (to->name)
                                if (!send_mbox(to->name, letnum))
                                        rc = 1;
                }
                return (rc);
        }

        /*
         * build argv list, allowing for arbitrarily long deliver lists
         * and then  hand the message off to sendmail
         */

        if (!ismail)
                nargs += 2;     /* for "-f", "Rpath" */

        for (to = &(list->recip_list); to; to = to->next)
                if (to->name)
                        nargs++;

        argv = malloc(nargs * sizeof (char *));

        if (argv == NULL)
                return (1);

        p = argv;

        *p++ = sendmail_prog;

        /* If we're rmail add "-f", "Rpath" to the the command line */
        if (!ismail) {
                *p++ = "-f";
                *p++ = Rpath;
        }

        *p++ = "-oi";
        *p++ = "--";            /* extra protection: end of argument list */

        for (to = &(list->recip_list); to; to = to->next)
                if (to->name)
                        *p++ = to->name;

        *p = NULL;

        fp = popenvp(sendmail_prog, argv, "w", 0);

        free(argv);

        if (fp == NULL)
                return (1);

        copylet(letnum, fp, ORDINARY);
        rc = pclosevp(fp);
        if (!rc)
                return (0);
        else
                return (1);
}

/*
 * send_mbox(user, letnum)  Sends the letter specified by letnum to the
 *      "user"'s mailbox. It returns 1 if the sending fails;
 *      0 on success.
 */



int
send_mbox(char *mbox, int letnum)
{
        char file[PATH_MAX];
        char biffmsg[PATH_MAX];
        int mbfd;
        FILE *malf;
        int rc;
        uid_t useruid, saved_uid;
        void (*istat)(), (*qstat)(), (*hstat)();

        if (!islocal(mbox, &useruid))
                return (1);
        (void) strlcpy(file, maildir, sizeof (file));
        if (strlcat(file, mbox, sizeof (file)) >= sizeof (file)) {
                rc = FALSE;
                goto done;
        }

        /*
         * We need to setgid and seteuid here since the users's mail box
         * might be NFS mounted and since root can't write across NFS.
         * Note this won't work with Secure NFS/RPC's.  Since delivering to
         * NFS mounted directories isn't really supported that's OK for now.
         */
        setgid(mailgrp);
        saved_uid = geteuid();
        seteuid(useruid);
        lock(mbox);

        /* ignore signals */
        istat = signal(SIGINT, SIG_IGN);
        qstat = signal(SIGQUIT, SIG_IGN);
        hstat = signal(SIGHUP, SIG_IGN);
        /* now access mail box */
        mbfd = accessmf(file);
        if (mbfd == -1) {       /* mail box access failed, bail out */
                unlock();
                rc = FALSE;
                sav_errno = EACCES;
                goto done;
        } else {
                                /* mail box is ok, now do append */
                if ((malf = fdopen(mbfd, "a")) != NULL) {
                        (void) snprintf(biffmsg, sizeof (biffmsg),
                            "%s@%d\n", mbox, ftell(malf));
                        rc = copylet(letnum, malf, ORDINARY);
                        fclose(malf);
                }
        }

        if (rc == FALSE)
                fprintf(stderr, "%s: Cannot append to %s\n", program, file);
        else
                notifybiff(biffmsg);

done:
        /* restore signal */
        (void) signal(SIGINT, istat);
        (void) signal(SIGQUIT, qstat);
        (void) signal(SIGHUP, hstat);
        unlock();
        seteuid(saved_uid);
        return (rc);
}

#include <sys/socket.h>
#include <netinet/in.h>

static void
notifybiff(char *msg)
{
        static struct sockaddr_in addr;
        static int f = -1;

        if (addr.sin_family == 0) {
                addr.sin_family = AF_INET;
                addr.sin_addr.s_addr = INADDR_LOOPBACK;
                addr.sin_port = htons(IPPORT_BIFFUDP);
        }
        if (f < 0)
                f = socket(AF_INET, SOCK_DGRAM, 0);
        sendto(f, msg, strlen(msg)+1, 0, (struct sockaddr *)&addr,
                sizeof (addr));
}