/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 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. 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.
 */



#include <sys/types.h>
#include <sys/uio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#include "ttymsg.h"

/*
 * Display the contents of a uio structure on a terminal.  Used by wall(1),
 * syslogd(8), and talkd(8).  Forks and finishes in child if write would block,
 * waiting up to tmout seconds.  Returns pointer to error string on unexpected
 * error; string is not newline-terminated.  Various "normal" errors are
 * ignored (exclusive-use, lack of permission, etc.).
 */
const char *
ttymsg(struct iovec *iov, int iovcnt, const char *line, int tmout)
{
        struct iovec localiov[TTYMSG_IOV_MAX];
        ssize_t left, wret;
        int cnt, fd;
        char device[MAXNAMLEN] = _PATH_DEV;
        static char errbuf[1024];
        char *p;
        int forked;

        forked = 0;
        if (iovcnt > (int)(sizeof(localiov) / sizeof(localiov[0])))
                return ("too many iov's (change code in wall/ttymsg.c)");

        strlcat(device, line, sizeof(device));
        p = device + sizeof(_PATH_DEV) - 1;
        if (strncmp(p, "pts/", 4) == 0)
                p += 4;
        if (strchr(p, '/') != NULL) {
                /* A slash is an attempt to break security... */
                (void) snprintf(errbuf, sizeof(errbuf),
                    "Too many '/' in \"%s\"", device);
                return (errbuf);
        }

        /*
         * open will fail on slip lines or exclusive-use lines
         * if not running as root; not an error.
         */
        if ((fd = open(device, O_WRONLY|O_NONBLOCK, 0)) < 0) {
                if (errno == EBUSY || errno == EACCES)
                        return (NULL);
                (void) snprintf(errbuf, sizeof(errbuf), "%s: %s", device,
                    strerror(errno));
                return (errbuf);
        }

        for (cnt = 0, left = 0; cnt < iovcnt; ++cnt)
                left += iov[cnt].iov_len;

        for (;;) {
                wret = writev(fd, iov, iovcnt);
                if (wret >= left)
                        break;
                if (wret >= 0) {
                        left -= wret;
                        if (iov != localiov) {
                                bcopy(iov, localiov, 
                                    iovcnt * sizeof(struct iovec));
                                iov = localiov;
                        }
                        for (cnt = 0; (size_t)wret >= iov->iov_len; ++cnt) {
                                wret -= iov->iov_len;
                                ++iov;
                                --iovcnt;
                        }
                        if (wret) {
                                iov->iov_base = (char *)iov->iov_base + wret;
                                iov->iov_len -= wret;
                        }
                        continue;
                }
                if (errno == EWOULDBLOCK) {
                        int cpid;

                        if (forked) {
                                (void) close(fd);
                                _exit(1);
                        }
                        cpid = fork();
                        if (cpid < 0) {
                                (void) snprintf(errbuf, sizeof(errbuf),
                                    "fork: %s", strerror(errno));
                                (void) close(fd);
                                return (errbuf);
                        }
                        if (cpid) {     /* parent */
                                (void) close(fd);
                                return (NULL);
                        }
                        forked++;
                        /* wait at most tmout seconds */
                        (void) signal(SIGALRM, SIG_DFL);
                        (void) signal(SIGTERM, SIG_DFL); /* XXX */
                        (void) sigsetmask(0);
                        (void) alarm((u_int)tmout);
                        (void) fcntl(fd, F_SETFL, 0);   /* clear O_NONBLOCK */
                        continue;
                }
                /*
                 * We get ENODEV on a slip line if we're running as root,
                 * and EIO if the line just went away.
                 */
                if (errno == ENODEV || errno == EIO)
                        break;
                (void) close(fd);
                if (forked)
                        _exit(1);
                (void) snprintf(errbuf, sizeof(errbuf),
                    "%s: %s", device, strerror(errno));
                return (errbuf);
        }

        (void) close(fd);
        if (forked)
                _exit(0);
        return (NULL);
}