/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1989, 2011, Oracle and/or its affiliates. All rights reserved.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/*
* svc_generic.c, Server side for RPC.
*
*/
#include "mt.h"
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <inttypes.h>
#include "rpc_mt.h"
#include <stdio.h>
#include <rpc/rpc.h>
#include <sys/types.h>
#include <errno.h>
#include <syslog.h>
#include <rpc/nettype.h>
#include <malloc.h>
#include <string.h>
#include <stropts.h>
#include <tsol/label.h>
#include <nfs/nfs.h>
#include <nfs/nfs_acl.h>
#include <rpcsvc/mount.h>
#include <rpcsvc/nsm_addr.h>
#include <rpcsvc/rquota.h>
#include <rpcsvc/sm_inter.h>
#include <rpcsvc/nlm_prot.h>
extern int __svc_vc_setflag(SVCXPRT *, int);
extern SVCXPRT *svc_dg_create_private(int, uint_t, uint_t);
extern SVCXPRT *svc_vc_create_private(int, uint_t, uint_t);
extern SVCXPRT *svc_fd_create_private(int, uint_t, uint_t);
extern bool_t __svc_add_to_xlist(SVCXPRT_LIST **, SVCXPRT *, mutex_t *);
extern void __svc_free_xlist(SVCXPRT_LIST **, mutex_t *);
extern bool_t __rpc_try_doors(const char *, bool_t *);
/*
* The highest level interface for server creation.
* It tries for all the nettokens in that particular class of token
* and returns the number of handles it can create and/or find.
*
* It creates a link list of all the handles it could create.
* If svc_create() is called multiple times, it uses the handle
* created earlier instead of creating a new handle every time.
*/
/* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
SVCXPRT_LIST *_svc_xprtlist = NULL;
extern mutex_t xprtlist_lock;
static SVCXPRT * svc_tli_create_common(int, const struct netconfig *,
const struct t_bind *, uint_t, uint_t, boolean_t);
boolean_t
is_multilevel(rpcprog_t prognum)
{
/* This is a list of identified multilevel service provider */
if ((prognum == MOUNTPROG) || (prognum == NFS_PROGRAM) ||
(prognum == NFS_ACL_PROGRAM) || (prognum == NLM_PROG) ||
(prognum == NSM_ADDR_PROGRAM) || (prognum == RQUOTAPROG) ||
(prognum == SM_PROG))
return (B_TRUE);
return (B_FALSE);
}
void
__svc_free_xprtlist(void)
{
__svc_free_xlist(&_svc_xprtlist, &xprtlist_lock);
}
int
svc_create(void (*dispatch)(), const rpcprog_t prognum, const rpcvers_t versnum,
const char *nettype)
{
SVCXPRT_LIST *l;
int num = 0;
SVCXPRT *xprt;
struct netconfig *nconf;
void *handle;
bool_t try_others;
/*
* Check if service should register over doors transport.
*/
if (__rpc_try_doors(nettype, &try_others)) {
if (svc_door_create(dispatch, prognum, versnum, 0) == NULL)
(void) syslog(LOG_ERR,
"svc_create: could not register over doors");
else
num++;
}
if (!try_others)
return (num);
if ((handle = __rpc_setconf((char *)nettype)) == NULL) {
(void) syslog(LOG_ERR, "svc_create: unknown protocol");
return (0);
}
while (nconf = __rpc_getconf(handle)) {
(void) mutex_lock(&xprtlist_lock);
for (l = _svc_xprtlist; l; l = l->next) {
if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
/* Found an old one, use it */
(void) rpcb_unset(prognum, versnum, nconf);
if (svc_reg(l->xprt, prognum, versnum,
dispatch, nconf) == FALSE)
(void) syslog(LOG_ERR,
"svc_create: could not register prog %d vers %d on %s",
prognum, versnum, nconf->nc_netid);
else
num++;
break;
}
}
(void) mutex_unlock(&xprtlist_lock);
if (l == NULL) {
/* It was not found. Now create a new one */
xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
if (xprt) {
if (!__svc_add_to_xlist(&_svc_xprtlist, xprt,
&xprtlist_lock)) {
(void) syslog(LOG_ERR,
"svc_create: no memory");
return (0);
}
num++;
}
}
}
__rpc_endconf(handle);
/*
* In case of num == 0; the error messages are generated by the
* underlying layers; and hence not needed here.
*/
return (num);
}
/*
* The high level interface to svc_tli_create().
* It tries to create a server for "nconf" and registers the service
* with the rpcbind. It calls svc_tli_create();
*/
SVCXPRT *
svc_tp_create(void (*dispatch)(), const rpcprog_t prognum,
const rpcvers_t versnum, const struct netconfig *nconf)
{
SVCXPRT *xprt;
boolean_t anon_mlp = B_FALSE;
if (nconf == NULL) {
(void) syslog(LOG_ERR,
"svc_tp_create: invalid netconfig structure for prog %d vers %d",
prognum, versnum);
return (NULL);
}
/* Some programs need to allocate MLP for multilevel services */
if (is_system_labeled() && is_multilevel(prognum))
anon_mlp = B_TRUE;
xprt = svc_tli_create_common(RPC_ANYFD, nconf, NULL, 0, 0, anon_mlp);
if (xprt == NULL)
return (NULL);
(void) rpcb_unset(prognum, versnum, (struct netconfig *)nconf);
if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
(void) syslog(LOG_ERR,
"svc_tp_create: Could not register prog %d vers %d on %s",
prognum, versnum, nconf->nc_netid);
SVC_DESTROY(xprt);
return (NULL);
}
return (xprt);
}
SVCXPRT *
svc_tli_create(const int fd, const struct netconfig *nconf,
const struct t_bind *bindaddr, const uint_t sendsz, const uint_t recvsz)
{
return (svc_tli_create_common(fd, nconf, bindaddr, sendsz, recvsz, 0));
}
/*
* If fd is RPC_ANYFD, then it opens a fd for the given transport
* provider (nconf cannot be NULL then). If the t_state is T_UNBND and
* bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
* NULL bindadr and Connection oriented transports, the value of qlen
* is set arbitrarily.
*
* If sendsz or recvsz are zero, their default values are chosen.
*/
SVCXPRT *
svc_tli_create_common(const int ofd, const struct netconfig *nconf,
const struct t_bind *bindaddr, const uint_t sendsz,
const uint_t recvsz, boolean_t mlp_flag)
{
SVCXPRT *xprt = NULL; /* service handle */
struct t_info tinfo; /* transport info */
struct t_bind *tres = NULL; /* bind info */
bool_t madefd = FALSE; /* whether fd opened here */
int state; /* state of the transport provider */
int fd = ofd;
if (fd == RPC_ANYFD) {
if (nconf == NULL) {
(void) syslog(LOG_ERR,
"svc_tli_create: invalid netconfig");
return (NULL);
}
fd = t_open(nconf->nc_device, O_RDWR, &tinfo);
if (fd == -1) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: could not open connection for %s: %s",
nconf->nc_netid, errorstr);
return (NULL);
}
madefd = TRUE;
state = T_UNBND;
} else {
/*
* It is an open descriptor. Sync it & get the transport info.
*/
if ((state = t_sync(fd)) == -1) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: could not do t_sync: %s",
errorstr);
return (NULL);
}
if (t_getinfo(fd, &tinfo) == -1) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: could not get transport information: %s",
errorstr);
return (NULL);
}
/* Enable options of returning the ip's for udp */
if (nconf) {
int ret = 0;
if (strcmp(nconf->nc_netid, "udp6") == 0) {
ret = __rpc_tli_set_options(fd, IPPROTO_IPV6,
IPV6_RECVPKTINFO, 1);
if (ret < 0) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: IPV6_RECVPKTINFO(1): %s",
errorstr);
return (NULL);
}
} else if (strcmp(nconf->nc_netid, "udp") == 0) {
ret = __rpc_tli_set_options(fd, IPPROTO_IP,
IP_RECVDSTADDR, 1);
if (ret < 0) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: IP_RECVDSTADDR(1): %s",
errorstr);
return (NULL);
}
}
}
}
/*
* If the fd is unbound, try to bind it.
* In any case, try to get its bound info in tres
*/
tres = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR);
if (tres == NULL) {
(void) syslog(LOG_ERR, "svc_tli_create: No memory!");
goto freedata;
}
switch (state) {
bool_t tcp, exclbind;
case T_UNBND:
/* If this is a labeled system, then ask for an MLP */
if (is_system_labeled() &&
(strcmp(nconf->nc_protofmly, NC_INET) == 0 ||
strcmp(nconf->nc_protofmly, NC_INET6) == 0)) {
(void) __rpc_tli_set_options(fd, SOL_SOCKET,
SO_RECVUCRED, 1);
if (mlp_flag)
(void) __rpc_tli_set_options(fd, SOL_SOCKET,
SO_ANON_MLP, 1);
}
/*
* SO_EXCLBIND has the following properties
* - an fd bound to port P via IPv4 will prevent an IPv6
* bind to port P (and vice versa)
* - an fd bound to a wildcard IP address for port P will
* prevent a more specific IP address bind to port P
* (see {tcp,udp}.c for details)
*
* We use the latter property to prevent hijacking of RPC
* services that reside at non-privileged ports.
*/
tcp = nconf ? (strcmp(nconf->nc_proto, NC_TCP) == 0) : 0;
if (nconf &&
(tcp || (strcmp(nconf->nc_proto, NC_UDP) == 0)) &&
rpc_control(__RPC_SVC_EXCLBIND_GET, &exclbind)) {
if (exclbind) {
if (__rpc_tli_set_options(fd, SOL_SOCKET,
SO_EXCLBIND, 1) < 0) {
syslog(LOG_ERR,
"svc_tli_create: can't set EXCLBIND [netid='%s']",
nconf->nc_netid);
goto freedata;
}
}
}
if (bindaddr) {
if (t_bind(fd, (struct t_bind *)bindaddr,
tres) == -1) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: could not bind: %s",
errorstr);
goto freedata;
}
/*
* Should compare the addresses only if addr.len
* was non-zero
*/
if (bindaddr->addr.len &&
(memcmp(bindaddr->addr.buf, tres->addr.buf,
(int)tres->addr.len) != 0)) {
(void) syslog(LOG_ERR,
"svc_tli_create: could not bind to requested address: %s",
"address mismatch");
goto freedata;
}
} else {
tres->qlen = 64; /* Chosen Arbitrarily */
tres->addr.len = 0;
if (t_bind(fd, tres, tres) == -1) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: could not bind: %s",
errorstr);
goto freedata;
}
}
/* Enable options of returning the ip's for udp */
if (nconf) {
int ret = 0;
if (strcmp(nconf->nc_netid, "udp6") == 0) {
ret = __rpc_tli_set_options(fd, IPPROTO_IPV6,
IPV6_RECVPKTINFO, 1);
if (ret < 0) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: IPV6_RECVPKTINFO(2): %s",
errorstr);
goto freedata;
}
} else if (strcmp(nconf->nc_netid, "udp") == 0) {
ret = __rpc_tli_set_options(fd, IPPROTO_IP,
IP_RECVDSTADDR, 1);
if (ret < 0) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR,
"svc_tli_create: IP_RECVDSTADDR(2): %s",
errorstr);
goto freedata;
}
}
}
break;
case T_IDLE:
if (bindaddr) {
/* Copy the entire stuff in tres */
if (tres->addr.maxlen < bindaddr->addr.len) {
(void) syslog(LOG_ERR,
"svc_tli_create: illegal netbuf length");
goto freedata;
}
tres->addr.len = bindaddr->addr.len;
(void) memcpy(tres->addr.buf, bindaddr->addr.buf,
(int)tres->addr.len);
} else
if (t_getname(fd, &(tres->addr), LOCALNAME) == -1)
tres->addr.len = 0;
break;
case T_INREL:
(void) t_rcvrel(fd);
(void) t_sndrel(fd);
(void) syslog(LOG_ERR,
"svc_tli_create: other side wants to\
release connection");
goto freedata;
case T_INCON:
/* Do nothing here. Assume this is handled in rendezvous */
break;
case T_DATAXFER:
/*
* This takes care of the case where a fd
* is passed on which a connection has already
* been accepted.
*/
if (t_getname(fd, &(tres->addr), LOCALNAME) == -1)
tres->addr.len = 0;
break;
default:
(void) syslog(LOG_ERR,
"svc_tli_create: connection in a wierd state (%d)", state);
goto freedata;
}
/*
* call transport specific function.
*/
switch (tinfo.servtype) {
case T_COTS_ORD:
case T_COTS:
if (state == T_DATAXFER)
xprt = svc_fd_create_private(fd, sendsz,
recvsz);
else
xprt = svc_vc_create_private(fd, sendsz,
recvsz);
if (!nconf || !xprt)
break;
if ((tinfo.servtype == T_COTS_ORD) &&
(state != T_DATAXFER) &&
(strcmp(nconf->nc_protofmly, "inet") == 0))
(void) __svc_vc_setflag(xprt, TRUE);
break;
case T_CLTS:
xprt = svc_dg_create_private(fd, sendsz, recvsz);
break;
default:
(void) syslog(LOG_ERR,
"svc_tli_create: bad service type");
goto freedata;
}
if (xprt == NULL)
/*
* The error messages here are spitted out by the lower layers:
* svc_vc_create(), svc_fd_create() and svc_dg_create().
*/
goto freedata;
/* fill in the other xprt information */
/* Assign the local bind address */
xprt->xp_ltaddr = tres->addr;
/* Fill in type of service */
xprt->xp_type = tinfo.servtype;
tres->addr.buf = NULL;
(void) t_free((char *)tres, T_BIND);
tres = NULL;
xprt->xp_rtaddr.len = 0;
xprt->xp_rtaddr.maxlen = __rpc_get_a_size(tinfo.addr);
/* Allocate space for the remote bind info */
if ((xprt->xp_rtaddr.buf = malloc(xprt->xp_rtaddr.maxlen)) == NULL) {
(void) syslog(LOG_ERR, "svc_tli_create: No memory!");
goto freedata;
}
if (nconf) {
xprt->xp_netid = strdup(nconf->nc_netid);
if (xprt->xp_netid == NULL) {
if (xprt->xp_rtaddr.buf)
free(xprt->xp_rtaddr.buf);
syslog(LOG_ERR, "svc_tli_create: strdup failed!");
goto freedata;
}
xprt->xp_tp = strdup(nconf->nc_device);
if (xprt->xp_tp == NULL) {
if (xprt->xp_rtaddr.buf)
free(xprt->xp_rtaddr.buf);
if (xprt->xp_netid)
free(xprt->xp_netid);
syslog(LOG_ERR, "svc_tli_create: strdup failed!");
goto freedata;
}
}
/*
* if (madefd && (tinfo.servtype == T_CLTS))
* (void) ioctl(fd, I_POP, NULL);
*/
xprt_register(xprt);
return (xprt);
freedata:
if (madefd)
(void) t_close(fd);
if (tres)
(void) t_free((char *)tres, T_BIND);
if (xprt) {
if (!madefd) /* so that svc_destroy doesnt close fd */
xprt->xp_fd = RPC_ANYFD;
SVC_DESTROY(xprt);
}
return (NULL);
}