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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.
*/
#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>
int rexecoptions;
libc_freeres_ptr (static char *ahostbuf);
int
rexec_af (char **ahost, int rport, const char *name, const char *pass,
const char *cmd, int *fd2p, sa_family_t af)
{
struct sockaddr_storage 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");
goto bad2;
}
*ahost = ahostbuf;
} else {
*ahost = NULL;
__set_errno (ENOENT);
goto bad2;
}
ruserpass(res0->ai_canonname, &name, &pass);
retry:
/* NB: No SOCK_CLOEXEC for backwards compatibility. */
s = __socket(res0->ai_family, res0->ai_socktype, 0);
if (s < 0) {
perror("rexec: socket");
goto bad2;
}
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);
goto bad;
}
if (fd2p == 0) {
(void) __write(s, "", 1);
port = 0;
} else {
char num[32];
int s2;
union
{
struct sockaddr_storage ss;
struct sockaddr sa;
} sa2;
socklen_t sa2len;
s2 = __socket(res0->ai_family, res0->ai_socktype, 0);
if (s2 < 0)
goto bad;
__listen(s2, 1);
sa2len = sizeof (sa2);
if (__getsockname(s2, &sa2.sa, &sa2len) < 0) {
perror("getsockname");
(void) __close(s2);
goto bad;
} else if (sa2len != SA_LEN(&sa2.sa)) {
__set_errno(EINVAL);
(void) __close(s2);
goto bad;
}
port = 0;
if (!getnameinfo(&sa2.sa, 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 = 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);
bad2:
freeaddrinfo(res0);
return (-1);
}
libc_hidden_def (rexec_af)
int
rexec (char **ahost, int rport, const char *name, const char *pass,
const char *cmd, int *fd2p)
{
return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);
}
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