glibc/inet/rcmd.c
Ulrich Drepper 86187531d3 Update.
1997-11-06 00:06  Ulrich Drepper  <drepper@cygnus.com>

	* argp/argp-help.c: Optimize a bit by using mempcpy.
	* elf/dl-load.c: Likewise.
	* elf/dl-lookup.c: Likewise.
	* inet/rcmd.c: Likewise.
	* io/ftw.c: Likewise.
	* libio/fileops.c: Likewise.
	* libio/genops.c: Likewise.
	* libio/obprintf.c: Likewise.
	* nss/nsswitch.c: Likewise.
	* posix/execvp.c: Likewise.
	* posix/getopt.c: Likewise.
	* posix/glob.c: Likewise.
	* posix/wordexp.c: Likewise.
	* stdio-common/vfprintf.c: Likewise.
	* stdlib/canonicalize.c: Likewise.
	* stdlib/msort.c: Likewise.
	* string/argz-replace.c: Likewise.
	* sysdeps/generic/putenv.c: Likewise.
	* sysdeps/generic/setenv.c: Likewise.
	* sysdeps/posix/getcwd.c: Likewise.
	* sysdeps/posix/ttyname.c: Likewise.
	* sysdeps/posix/writev.c: Likewise.
	* time/strftime.c: Likewise.
	* time/tzfile.c: Likewise.

	* login/utmp_daemon.c: Use memcpy instead of strcpy where possible.
	* sunrpc/svcauth_des.c: Likewise.
	* sysdeps/unix/sysv/linux/gethostname.c: Likewise.

	* misc/tsearch.c: Use memcpy return value if possible.
	* posix/regex.c: Likewise.
	* sysdeps/unix/readdir_r.c: Likewise.
	* wcsmbc/wcsdup.c: Likewise.

	* nss/digits_dots.c: Little optimization.

	* inet/ruserpass.c (ruserpass): Optimize by using stpcpy.
	(struct toktab): Make tokstr field a const char *.

	* elf/dl-profile.c: Fix typo.

	* inet/ether_ntoh.c: Don't use relative #include path.
	* inet/gethstbynm.c: Likewise.
	* resolv/inet_pton.c: Likewise.
	* shadow/sgetspent_r.c: Likewise.

	* libio/oldfileops.c (_IO_old_file_jumps): Use correct sync and write
	callbacks.  Patch by NIIBE Yutaka <gniibe@mri.co.jp>.

	* posix/confstr.c: Correct string for _CS_LFS_CFLAGS.
	Handle _CS_XBS5_* constants.
	* posix/unistd.h: Add comment describing _XBS5_* constants.
	* sysdeps/generic/bits/confname.h: Add _CS_XBS5_* constants.

	* posix/regex.c: Indent preprocessor code.

	* posix/wordexp.c: Using _itoa_word instead of sprintf.

	* stdlib/canonicalize.c: Avoid unnecessary copying.  Handle NULL
	and "" arguments correctly according to SUS.
	* stdlib/test-canon.c: Test "" and NULL argument handling.

	* sysdeps/posix/writev.c: Correct condition to leave the loop.

1997-11-05 18:13  Ulrich Drepper  <drepper@cygnus.com>

	* nss/getXXbyYY.c: Set buffer to NULL if realloc fails so that possible
	next call starts with malloc again.
	Proposed by Joe Keane <jgk@jgk.org>.

1997-11-04 23:57  Ulrich Drepper  <drepper@cygnus.com>

	* configure.in: Correct gcc -pipe test.
	Patch by Zack Weinberg <zack@rabi.phys.columbia.edu>.

	* posix/glob.c: Cleanups.  Patch by H.J. Lu <hjl@lucon.org>.

1997-11-04  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* manual/creature.texi (Feature Test Macros): Add _POSIX_C_SOURCE
	definition.
1997-11-06 00:02:46 +00:00

467 lines
11 KiB
C

/*
* Copyright (c) 1983, 1993, 1994
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <alloca.h>
#include <signal.h>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
int __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
static int __icheckhost __P((u_int32_t, char *)) internal_function;
int
rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
char **ahost;
u_short rport;
const char *locuser, *remuser, *cmd;
int *fd2p;
{
struct hostent hostbuf, *hp;
size_t hstbuflen;
char *tmphstbuf;
struct sockaddr_in sin, from;
fd_set reads;
int32_t oldmask;
pid_t pid;
int s, lport, timo;
char c;
int herr;
pid = getpid();
hstbuflen = 1024;
tmphstbuf = __alloca (hstbuflen);
while (__gethostbyname_r (*ahost, &hostbuf, tmphstbuf, hstbuflen,
&hp, &herr) < 0)
if (herr != NETDB_INTERNAL || errno != ERANGE)
{
__set_h_errno (herr);
herror(*ahost);
return -1;
}
else
{
/* Enlarge the buffer. */
hstbuflen *= 2;
tmphstbuf = __alloca (hstbuflen);
}
*ahost = hp->h_name;
oldmask = sigblock(sigmask(SIGURG));
for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
s = rresvport(&lport);
if (s < 0) {
if (errno == EAGAIN)
(void)fprintf(stderr,
_("rcmd: socket: All ports in use\n"));
else
(void)fprintf(stderr, "rcmd: socket: %m\n");
sigsetmask(oldmask);
return -1;
}
fcntl(s, F_SETOWN, pid);
sin.sin_family = hp->h_addrtype;
bcopy(hp->h_addr_list[0], &sin.sin_addr,
MIN (sizeof (sin.sin_addr), hp->h_length));
sin.sin_port = rport;
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
break;
(void)close(s);
if (errno == EADDRINUSE) {
lport--;
continue;
}
if (errno == ECONNREFUSED && timo <= 16) {
(void)sleep(timo);
timo *= 2;
continue;
}
if (hp->h_addr_list[1] != NULL) {
int oerrno = errno;
(void)fprintf(stderr, _("connect to address %s: "),
inet_ntoa(sin.sin_addr));
__set_errno (oerrno);
perror(0);
hp->h_addr_list++;
bcopy(hp->h_addr_list[0], &sin.sin_addr,
MIN (sizeof (sin.sin_addr), hp->h_length));
(void)fprintf(stderr, _("Trying %s...\n"),
inet_ntoa(sin.sin_addr));
continue;
}
(void)fprintf(stderr, "%s: %m\n", hp->h_name);
sigsetmask(oldmask);
return -1;
}
lport--;
if (fd2p == 0) {
write(s, "", 1);
lport = 0;
} else {
char num[8];
int s2 = rresvport(&lport), s3;
size_t len = sizeof(from);
if (s2 < 0)
goto bad;
listen(s2, 1);
(void)snprintf(num, sizeof(num), "%d", lport);
if (write(s, num, strlen(num)+1) != strlen(num)+1) {
(void)fprintf(stderr,
_("rcmd: write (setting up stderr): %m\n"));
(void)close(s2);
goto bad;
}
FD_ZERO(&reads);
FD_SET(s, &reads);
FD_SET(s2, &reads);
__set_errno (0);
if (select(1 + (s > s2 ? s : s2), &reads, 0, 0, 0) < 1 ||
!FD_ISSET(s2, &reads)) {
if (errno != 0)
(void)fprintf(stderr,
_("rcmd: select (setting up stderr): %m\n"));
else
(void)fprintf(stderr,
_("select: protocol failure in circuit setup\n"));
(void)close(s2);
goto bad;
}
s3 = accept(s2, (struct sockaddr *)&from, &len);
(void)close(s2);
if (s3 < 0) {
(void)fprintf(stderr,
"rcmd: accept: %m\n");
lport = 0;
goto bad;
}
*fd2p = s3;
from.sin_port = ntohs((u_short)from.sin_port);
if (from.sin_family != AF_INET ||
from.sin_port >= IPPORT_RESERVED ||
from.sin_port < IPPORT_RESERVED / 2) {
(void)fprintf(stderr,
_("socket: protocol failure in circuit setup\n"));
goto bad2;
}
}
(void)write(s, locuser, strlen(locuser)+1);
(void)write(s, remuser, strlen(remuser)+1);
(void)write(s, cmd, strlen(cmd)+1);
if (read(s, &c, 1) != 1) {
(void)fprintf(stderr,
"rcmd: %s: %m\n", *ahost);
goto bad2;
}
if (c != 0) {
while (read(s, &c, 1) == 1) {
(void)write(STDERR_FILENO, &c, 1);
if (c == '\n')
break;
}
goto bad2;
}
sigsetmask(oldmask);
return s;
bad2:
if (lport)
(void)close(*fd2p);
bad:
(void)close(s);
sigsetmask(oldmask);
return -1;
}
int
rresvport(alport)
int *alport;
{
struct sockaddr_in sin;
int s;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return -1;
for (;;) {
sin.sin_port = htons((u_short)*alport);
if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
return s;
if (errno != EADDRINUSE) {
(void)close(s);
return -1;
}
(*alport)--;
if (*alport == IPPORT_RESERVED/2) {
(void)close(s);
__set_errno (EAGAIN); /* close */
return -1;
}
}
}
int __check_rhosts_file = 1;
char *__rcmd_errstr;
int
ruserok(rhost, superuser, ruser, luser)
const char *rhost, *ruser, *luser;
int superuser;
{
struct hostent hostbuf, *hp;
size_t buflen;
char *buffer;
u_int32_t addr;
char **ap;
int herr;
buflen = 1024;
buffer = __alloca (buflen);
while (__gethostbyname_r (rhost, &hostbuf, buffer, buflen, &hp, &herr)
< 0)
if (herr != NETDB_INTERNAL || errno != ERANGE)
return -1;
else
{
/* Enlarge the buffer. */
buflen *= 2;
buffer = __alloca (buflen);
}
for (ap = hp->h_addr_list; *ap; ++ap) {
bcopy(*ap, &addr, sizeof(addr));
if (iruserok(addr, superuser, ruser, luser) == 0)
return 0;
}
return -1;
}
/*
* New .rhosts strategy: We are passed an ip address. We spin through
* hosts.equiv and .rhosts looking for a match. When the .rhosts only
* has ip addresses, we don't have to trust a nameserver. When it
* contains hostnames, we spin through the list of addresses the nameserver
* gives us and look for a match.
*
* Returns 0 if ok, -1 if not ok.
*/
int
iruserok(raddr, superuser, ruser, luser)
u_int32_t raddr;
int superuser;
const char *ruser, *luser;
{
register char *cp;
struct stat sbuf;
struct passwd pwdbuf, *pwd;
FILE *hostf;
int first;
first = 1;
hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
again:
if (hostf) {
if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
(void)fclose(hostf);
return 0;
}
(void)fclose(hostf);
}
if (first == 1 && (__check_rhosts_file || superuser)) {
char *pbuf;
size_t dirlen;
size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
char *buffer = __alloca (buflen);
first = 0;
if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) < 0)
return -1;
dirlen = strlen (pwd->pw_dir);
pbuf = alloca (dirlen + sizeof "/.rhosts");
__mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
"/.rhosts", sizeof "/.rhosts");
/*
* Change effective uid while opening .rhosts. If root and
* reading an NFS mounted file system, can't read files that
* are protected read/write owner only.
*/
if (__access (pbuf, R_OK) != 0)
hostf = NULL;
else
{
uid_t uid = geteuid ();
seteuid (pwd->pw_uid);
hostf = fopen (pbuf, "r");
seteuid (uid);
}
if (hostf == NULL)
return -1;
/*
* If not a regular file, or is owned by someone other than
* user or root or if writeable by anyone but the owner, quit.
*/
cp = NULL;
if (lstat(pbuf, &sbuf) < 0)
cp = _(".rhosts lstat failed");
else if (!S_ISREG(sbuf.st_mode))
cp = _(".rhosts not regular file");
else if (fstat(fileno(hostf), &sbuf) < 0)
cp = _(".rhosts fstat failed");
else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
cp = _("bad .rhosts owner");
else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
cp = _(".rhosts writeable by other than owner");
/* If there were any problems, quit. */
if (cp) {
__rcmd_errstr = cp;
(void)fclose(hostf);
return -1;
}
goto again;
}
return -1;
}
/*
* XXX
* Don't make static, used by lpd(8).
*
* Returns 0 if ok, -1 if not ok.
*/
int
__ivaliduser(hostf, raddr, luser, ruser)
FILE *hostf;
u_int32_t raddr;
const char *luser, *ruser;
{
register char *user, *p;
int ch;
char *buf = NULL;
size_t bufsize = 0;
ssize_t nread;
while ((nread = __getline (&buf, &bufsize, hostf)) > 0) {
buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
p = buf;
while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
*p = isupper(*p) ? tolower(*p) : *p;
p++;
}
if (*p == ' ' || *p == '\t') {
*p++ = '\0';
while (*p == ' ' || *p == '\t')
p++;
user = p;
while (*p != '\n' && *p != ' ' &&
*p != '\t' && *p != '\0')
p++;
} else
user = p;
*p = '\0';
if (__icheckhost(raddr, buf) &&
strcmp(ruser, *user ? user : luser) == 0) {
free (buf);
return 0;
}
}
free (buf);
return -1;
}
/*
* Returns "true" if match, 0 if no match.
*/
static int
internal_function
__icheckhost(raddr, lhost)
u_int32_t raddr;
register char *lhost;
{
struct hostent hostbuf, *hp;
size_t buflen;
char *buffer;
register u_int32_t laddr;
register char **pp;
int herr;
/* Try for raw ip address first. */
if (isdigit(*lhost) && (int32_t)(laddr = inet_addr(lhost)) != -1)
return raddr == laddr;
/* Better be a hostname. */
buflen = 1024;
buffer = __alloca (buflen);
while (__gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
< 0)
if (herr != NETDB_INTERNAL || errno != ERANGE)
return 0;
else
{
/* Enlarge the buffer. */
buflen *= 2;
buffer = __alloca (buflen);
}
/* Spin through ip addresses. */
for (pp = hp->h_addr_list; *pp; ++pp)
if (!bcmp(&raddr, *pp, sizeof(u_int32_t)))
return 1;
/* No match. */
return 0;
}