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/*

 * Copyright (c) 1980, 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.

 * 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.

 */

#define __FORCE_GLIBC

#include <features.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <alloca.h>

#include <stdio.h>

#include <netdb.h>

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#define SA_LEN(_x)      __libc_sa_len((_x)->sa_family)

extern int __libc_sa_len (sa_family_t __af) __THROW;

int     rexecoptions;

char    ahostbuf[NI_MAXHOST];

extern int ruserpass(const char *host, const char **aname, const char **apass);

int

rexec_af(ahost, rport, name, pass, cmd, fd2p, af)

        char **ahost;

        int rport;

        const char *name, *pass, *cmd;

        int *fd2p;

        sa_family_t af;

{

        struct sockaddr_storage sa2, from;

        struct addrinfo hints, *res0;

        const char *orig_name = name;

        const char *orig_pass = pass;

        u_short port = 0;

        int s, timo = 1, s3;

        char c;

        int gai;

        char servbuff[NI_MAXSERV];

        snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));

        servbuff[sizeof(servbuff) - 1] = '\0';

        memset(&hints, 0, sizeof(hints));

        hints.ai_family = af;

        hints.ai_socktype = SOCK_STREAM;

        hints.ai_flags = AI_CANONNAME;

        gai = getaddrinfo(*ahost, servbuff, &hints, &res0);

        if (gai){

                /* XXX: set errno? */

                return -1;

        }

        if (res0->ai_canonname){

                strncpy(ahostbuf, res0->ai_canonname, sizeof(ahostbuf));

                ahostbuf[sizeof(ahostbuf)-1] = '\0';

                *ahost = ahostbuf;

        }

        else{

                *ahost = NULL;

        }

        ruserpass(res0->ai_canonname, &name, &pass);

retry:

        s = socket(res0->ai_family, res0->ai_socktype, 0);

        if (s < 0) {

                perror("rexec: socket");

                return (-1);

        }

        if (connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {

                if (errno == ECONNREFUSED && timo <= 16) {

                        (void) close(s);

                        sleep(timo);

                        timo *= 2;

                        goto retry;

                }

                perror(res0->ai_canonname);

                return (-1);

        }

        if (fd2p == 0) {

                (void) write(s, "", 1);

                port = 0;

        } else {

                char num[32];

                int s2, sa2len;

                s2 = socket(res0->ai_family, res0->ai_socktype, 0);

                if (s2 < 0) {

                        (void) close(s);

                        return (-1);

                }

                listen(s2, 1);

                sa2len = sizeof (sa2);

                if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) {

                        perror("getsockname");

                        (void) close(s2);

                        goto bad;

                } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {

                        __set_errno(EINVAL);

                        (void) close(s2);

                        goto bad;

                }

                port = 0;

                if (!getnameinfo((struct sockaddr *)&sa2, sa2len,

                                 NULL, 0, servbuff, sizeof(servbuff),

                                 NI_NUMERICSERV))

                        port = atoi(servbuff);

                (void) sprintf(num, "%u", port);

                (void) write(s, num, strlen(num)+1);

                { socklen_t len = sizeof (from);

                  s3 = accept(s2, (struct sockaddr *)&from, &len);

                  close(s2);

                  if (s3 < 0) {

                        perror("accept");

                        port = 0;

                        goto bad;

                  }

                }

                *fd2p = s3;

        }

        (void) write(s, name, strlen(name) + 1);

        /* should public key encypt the password here */

        (void) write(s, pass, strlen(pass) + 1);

        (void) write(s, cmd, strlen(cmd) + 1);

        /* We don't need the memory allocated for the name and the password

           in ruserpass anymore.  */

        if (name != orig_name)

          free ((char *) name);

        if (pass != orig_pass)

          free ((char *) pass);

        if (read(s, &c, 1) != 1) {

                perror(*ahost);

                goto bad;

        }

        if (c != 0) {

                while (read(s, &c, 1) == 1) {

                        (void) write(2, &c, 1);

                        if (c == '\n')

                                break;

                }

                goto bad;

        }

        freeaddrinfo(res0);

        return (s);

bad:

        if (port)

                (void) close(*fd2p);

        (void) close(s);

        freeaddrinfo(res0);

        return (-1);

}

int

rexec(ahost, rport, name, pass, cmd, fd2p)

        char **ahost;

        int rport;

        const char *name, *pass, *cmd;

        int *fd2p;

{

        return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);

}