source: trunk/libs/newlib/src/newlib/libc/sys/linux/net/rexec.c @ 444

/*
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rexec.c     8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#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>
#include <sys/uio.h>
#include "libc-symbols.h"

int     rexecoptions;
libc_freeres_ptr (static char *ahostbuf);

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){
                free (ahostbuf);
                ahostbuf = strdup (res0->ai_canonname);
                if (ahostbuf == NULL) {
                        perror ("rexec: strdup");
                        return (-1);
                }
                *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;
#ifdef SA_LEN
                } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {
                        __set_errno(EINVAL);
                        (void) __close(s2);
                        goto bad;
#endif
                }
                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);
                { int len = sizeof (from);
                  s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,
                                                  &len));
                  __close(s2);
                  if (s3 < 0) {
                        perror("accept");
                        port = 0;
                        goto bad;
                  }
                }
                *fd2p = s3;
        }

        struct iovec iov[3] =
          {
            [0] = { .iov_base = (void *) name, .iov_len = strlen (name) + 1 },
            /* should public key encypt the password here */
            [1] = { .iov_base = (void *) pass, .iov_len = strlen (pass) + 1 },
            [2] = { .iov_base = (void *) cmd, .iov_len = strlen (cmd) + 1 }
          };
        (void) TEMP_FAILURE_RETRY (writev (s, iov, 3));

        /* 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);
}
libc_hidden_def (rexec_af)

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);
}