cmd/mail/sendlist.c

/*
 * 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 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#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));
}