/* $NetBSD: amq_svc.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* 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.
*
*
* File: am-utils/amd/amq_svc.c
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/* typedefs */
typedef char *(*amqsvcproc_t)(voidp, struct svc_req *);
#if defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP)
# ifdef NEED_LIBWRAP_SEVERITY_VARIABLES
/*
* Some systems that define libwrap already define these two variables
* in libwrap, while others don't: so I need to know precisely iff
* to define these two severity variables.
*/
int allow_severity=0, deny_severity=0, rfc931_timeout=0;
# endif /* NEED_LIBWRAP_SEVERITY_VARIABLES */
/*
* check if remote amq is authorized to access this amd.
* Returns: 1=allowed, 0=denied.
*/
static int
amqsvc_is_client_allowed(const struct sockaddr_in *addr)
{
struct request_info req;
request_init(&req, RQ_DAEMON, AMD_SERVICE_NAME, RQ_CLIENT_SIN, addr, 0);
sock_methods(&req);
if (hosts_access(&req))
return 1;
return 0;
}
#endif /* defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP) */
/*
* Prepare the parent and child:
* 1) Setup IPC pipe.
* 2) Set signal masks.
* 3) Fork by calling background() so that NumChildren is updated.
*/
static int
amq_fork(opaque_t argp)
{
#ifdef HAVE_SIGACTION
sigset_t new, mask;
#else /* not HAVE_SIGACTION */
int mask;
#endif /* not HAVE_SIGACTION */
am_node *mp;
pid_t pid;
mp = find_ap(*(char **) argp);
if (mp == NULL) {
errno = 0;
return -1;
}
if (pipe(mp->am_fd) == -1) {
mp->am_fd[0] = -1;
mp->am_fd[1] = -1;
return -1;
}
#ifdef HAVE_SIGACTION
sigemptyset(&new); /* initialize signal set we wish to block */
sigaddset(&new, SIGHUP);
sigaddset(&new, SIGINT);
sigaddset(&new, SIGQUIT);
sigaddset(&new, SIGCHLD);
sigprocmask(SIG_BLOCK, &new, &mask);
#else /* not HAVE_SIGACTION */
mask =
sigmask(SIGHUP) |
sigmask(SIGINT) |
sigmask(SIGQUIT) |
sigmask(SIGCHLD);
mask = sigblock(mask);
#endif /* not HAVE_SIGACTION */
switch ((pid = background())) {
case -1: /* error */
dlog("amq_fork failed");
return -1;
case 0: /* child */
close(mp->am_fd[1]); /* close output end of pipe */
mp->am_fd[1] = -1;
return 0;
default: /* parent */
close(mp->am_fd[0]); /* close input end of pipe */
mp->am_fd[0] = -1;
#ifdef HAVE_SIGACTION
sigprocmask(SIG_SETMASK, &mask, NULL);
#else /* not HAVE_SIGACTION */
sigsetmask(mask);
#endif /* not HAVE_SIGACTION */
return pid;
}
}
void
amq_program_1(struct svc_req *rqstp, SVCXPRT *transp)
{
union {
amq_string amqproc_mnttree_1_arg;
amq_string amqproc_umnt_1_arg;
amq_setopt amqproc_setopt_1_arg;
} argument;
char *result;
xdrproc_t xdr_argument, xdr_result;
amqsvcproc_t local;
amqsvcproc_t child;
amqsvcproc_t parent;
pid_t pid;
#if defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP)
if (gopt.flags & CFM_USE_TCPWRAPPERS) {
struct sockaddr_in *remote_addr = svc_getcaller(rqstp->rq_xprt);
char *remote_hostname = inet_ntoa(remote_addr->sin_addr);
if (!amqsvc_is_client_allowed(remote_addr)) {
plog(XLOG_WARNING, "Amd denied remote amq service to %s", remote_hostname);
svcerr_auth(transp, AUTH_FAILED);
return;
} else {
dlog("Amd allowed remote amq service to %s", remote_hostname);
}
}
#endif /* defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP) */
local = NULL;
child = NULL;
parent = NULL;
switch (rqstp->rq_proc) {
case AMQPROC_NULL:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_void;
local = (amqsvcproc_t) amqproc_null_1_svc;
break;
case AMQPROC_MNTTREE:
xdr_argument = (xdrproc_t) xdr_amq_string;
xdr_result = (xdrproc_t) xdr_amq_mount_tree_p;
local = (amqsvcproc_t) amqproc_mnttree_1_svc;
break;
case AMQPROC_UMNT:
xdr_argument = (xdrproc_t) xdr_amq_string;
xdr_result = (xdrproc_t) xdr_void;
local = (amqsvcproc_t) amqproc_umnt_1_svc;
break;
case AMQPROC_STATS:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_amq_mount_stats;
local = (amqsvcproc_t) amqproc_stats_1_svc;
break;
case AMQPROC_EXPORT:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_amq_mount_tree_list;
local = (amqsvcproc_t) amqproc_export_1_svc;
break;
case AMQPROC_SETOPT:
xdr_argument = (xdrproc_t) xdr_amq_setopt;
xdr_result = (xdrproc_t) xdr_int;
local = (amqsvcproc_t) amqproc_setopt_1_svc;
break;
case AMQPROC_GETMNTFS:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_amq_mount_info_qelem;
local = (amqsvcproc_t) amqproc_getmntfs_1_svc;
break;
case AMQPROC_GETVERS:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_amq_string;
local = (amqsvcproc_t) amqproc_getvers_1_svc;
break;
case AMQPROC_GETPID:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_int;
local = (amqsvcproc_t) amqproc_getpid_1_svc;
break;
case AMQPROC_PAWD:
xdr_argument = (xdrproc_t) xdr_amq_string;
xdr_result = (xdrproc_t) xdr_amq_string;
local = (amqsvcproc_t) amqproc_pawd_1_svc;
break;
case AMQPROC_SYNC_UMNT:
xdr_argument = (xdrproc_t) xdr_amq_string;
xdr_result = (xdrproc_t) xdr_amq_sync_umnt;
parent = (amqsvcproc_t) amqproc_sync_umnt_1_svc_parent;
child = (amqsvcproc_t) amqproc_sync_umnt_1_svc_child;
/* used if fork fails */
local = (amqsvcproc_t) amqproc_sync_umnt_1_svc_async;
break;
case AMQPROC_GETMAPINFO:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_amq_map_info_qelem;
local = (amqsvcproc_t) amqproc_getmapinfo_1_svc;
break;
default:
svcerr_noproc(transp);
return;
}
memset((char *) &argument, 0, sizeof(argument));
if (!svc_getargs(transp,
(XDRPROC_T_TYPE) xdr_argument,
(SVC_IN_ARG_TYPE) & argument)) {
svcerr_decode(transp);
return;
}
pid = -1;
result = NULL;
if (child) {
switch ((pid = amq_fork(&argument))) {
case -1: /* error */
break;
case 0: /* child */
result = (*child) (&argument, rqstp);
local = NULL;
break;
default: /* parent */
result = (*parent) (&argument, rqstp);
local = NULL;
break;
}
}
if (local)
result = (*local) (&argument, rqstp);
if (result != NULL && !svc_sendreply(transp,
(XDRPROC_T_TYPE) xdr_result,
result)) {
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp,
(XDRPROC_T_TYPE) xdr_argument,
(SVC_IN_ARG_TYPE) & argument)) {
plog(XLOG_FATAL, "unable to free rpc arguments in amqprog_1");
going_down(1);
}
if (pid == 0)
exit(0); /* the child is done! */
}