libnsl/rpc/rpc_soc.c

	rpc_soc.c revision 61961e0f20c7637a3846bb39786bb9dffa91dfb9
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * Portions of this source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#ifdef PORTMAP
/*
 * rpc_soc.c
 *
 * The backward compatibility routines for the earlier implementation
 * of RPC, where the only transports supported were tcp/ip and udp/ip.
 * Based on berkeley socket abstraction, now implemented on the top
 * of TLI/Streams
 */

#include "mt.h"
#include "rpc_mt.h"
#include <stdio.h>
#include <sys/types.h>
#include <rpc/rpc.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netdir.h>
#include <errno.h>
#include <sys/syslog.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpc/nettype.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

int __rpc_bindresvport(int, struct sockaddr_in *, int *, int);
int __rpc_bindresvport_ipv6(int, struct sockaddr *, int *, int, char *);
void get_myaddress_ipv6(char *, struct sockaddr *);

extern mutex_t  rpcsoc_lock;

/*
 * A common clnt create routine
 */
static CLIENT *
clnt_com_create(struct sockaddr_in *raddr, rpcprog_t prog, rpcvers_t vers,
    int *sockp, uint_t sendsz, uint_t recvsz, char *tp)
{
    CLIENT *cl;
    int madefd = FALSE;
    int fd = *sockp;
    struct t_info tinfo;
    struct netconfig *nconf;
    int port;
    struct netbuf bindaddr;
    extern int __rpc_minfd;
    bool_t locked = TRUE;

    (void) mutex_lock(&rpcsoc_lock);
    if ((nconf = __rpc_getconfip(tp)) == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        (void) mutex_unlock(&rpcsoc_lock);
        return (NULL);
    }
    if (fd == RPC_ANYSOCK) {
        fd = t_open(nconf->nc_device, O_RDWR, &tinfo);
        if (fd == -1)
            goto syserror;
        if (fd < __rpc_minfd)
            fd = __rpc_raise_fd(fd);
        madefd = TRUE;
    } else {
        if (t_getinfo(fd, &tinfo) == -1)
            goto syserror;
    }

    if (raddr->sin_port == 0) {
        uint_t proto;
        ushort_t sport;

        /* pmap_getport is recursive */
        (void) mutex_unlock(&rpcsoc_lock);
        proto = strcmp(tp, "udp") == 0 ? IPPROTO_UDP : IPPROTO_TCP;
        sport = pmap_getport(raddr, prog, vers, proto);
        if (sport == 0) {
            locked = FALSE;
            goto err;
        }
        raddr->sin_port = htons(sport);
        /* pmap_getport is recursive */
        (void) mutex_lock(&rpcsoc_lock);
    }

    /* Transform sockaddr_in to netbuf */
    bindaddr.maxlen = bindaddr.len =  __rpc_get_a_size(tinfo.addr);
    bindaddr.buf = (char *)raddr;

    (void) __rpc_bindresvport(fd, NULL, &port, 0);
    cl = clnt_tli_create(fd, nconf, &bindaddr, prog, vers,
                sendsz, recvsz);
    if (cl) {
        if (madefd == TRUE) {
            /*
             * The fd should be closed while destroying the handle.
             */
            (void) CLNT_CONTROL(cl, CLSET_FD_CLOSE, NULL);
            *sockp = fd;
        }
        (void) freenetconfigent(nconf);
        (void) mutex_unlock(&rpcsoc_lock);
        return (cl);
    }
    goto err;

syserror:
    rpc_createerr.cf_stat = RPC_SYSTEMERROR;
    rpc_createerr.cf_error.re_errno = errno;
    rpc_createerr.cf_error.re_terrno = t_errno;

err:    if (madefd == TRUE)
        (void) t_close(fd);
    (void) freenetconfigent(nconf);
    if (locked == TRUE)
        (void) mutex_unlock(&rpcsoc_lock);
    return (NULL);
}

CLIENT *
clntudp_bufcreate(struct sockaddr_in *raddr, rpcprog_t prog, rpcvers_t vers,
    struct timeval wait, int *sockp, uint_t sendsz, uint_t recvsz)
{
    CLIENT *cl;

    cl = clnt_com_create(raddr, prog, vers, sockp, sendsz, recvsz, "udp");
    if (cl == NULL)
        return (NULL);
    (void) CLNT_CONTROL(cl, CLSET_RETRY_TIMEOUT, (char *)&wait);
    return (cl);
}

CLIENT *
clntudp_create(struct sockaddr_in *raddr, rpcprog_t program, rpcvers_t version,
    struct timeval wait, int *sockp)
{
    return (clntudp_bufcreate(raddr, program, version, wait, sockp,
                    UDPMSGSIZE, UDPMSGSIZE));
}

CLIENT *
clnttcp_create(struct sockaddr_in *raddr, rpcprog_t prog, rpcvers_t vers,
    int *sockp, uint_t sendsz, uint_t recvsz)
{
    return (clnt_com_create(raddr, prog, vers, sockp, sendsz,
            recvsz, "tcp"));
}

CLIENT *
clntraw_create(rpcprog_t prog, rpcvers_t vers)
{
    return (clnt_raw_create(prog, vers));
}

/*
 * A common server create routine
 */
static SVCXPRT *
svc_com_create(int fd, uint_t sendsize, uint_t recvsize, char *netid)
{
    struct netconfig *nconf;
    SVCXPRT *svc;
    int madefd = FALSE;
    int port;
    int res;

    if ((nconf = __rpc_getconfip(netid)) == NULL) {
        (void) syslog(LOG_ERR, "Could not get %s transport", netid);
        return (NULL);
    }
    if (fd == RPC_ANYSOCK) {
        fd = t_open(nconf->nc_device, O_RDWR, NULL);
        if (fd == -1) {
            char errorstr[100];

            __tli_sys_strerror(errorstr, sizeof (errorstr),
                    t_errno, errno);
            (void) syslog(LOG_ERR,
            "svc%s_create: could not open connection : %s", netid,
                    errorstr);
            (void) freenetconfigent(nconf);
            return (NULL);
        }
        madefd = TRUE;
    }

    res = __rpc_bindresvport(fd, NULL, &port, 8);
    svc = svc_tli_create(fd, nconf, NULL,
                sendsize, recvsize);
    (void) freenetconfigent(nconf);
    if (svc == NULL) {
        if (madefd)
            (void) t_close(fd);
        return (NULL);
    }
    if (res == -1)
        /* LINTED pointer cast */
        port = (((struct sockaddr_in *)svc->xp_ltaddr.buf)->sin_port);
    svc->xp_port = ntohs(port);
    return (svc);
}

SVCXPRT *
svctcp_create(int fd, uint_t sendsize, uint_t recvsize)
{
    return (svc_com_create(fd, sendsize, recvsize, "tcp"));
}

SVCXPRT *
svcudp_bufcreate(int fd, uint_t sendsz, uint_t recvsz)
{
    return (svc_com_create(fd, sendsz, recvsz, "udp"));
}

SVCXPRT *
svcfd_create(int fd, uint_t sendsize, uint_t recvsize)
{
    return (svc_fd_create(fd, sendsize, recvsize));
}


SVCXPRT *
svcudp_create(int fd)
{
    return (svc_com_create(fd, UDPMSGSIZE, UDPMSGSIZE, "udp"));
}

SVCXPRT *
svcraw_create(void)
{
    return (svc_raw_create());
}

/*
 * Bind a fd to a privileged IP port.
 * This is slightly different from the code in netdir_options
 * because it has a different interface - main thing is that it
 * needs to know its own address.  We also wanted to set the qlen.
 * t_getname() can be used for those purposes and perhaps job can be done.
 */
int
__rpc_bindresvport_ipv6(int fd, struct sockaddr *sin, int *portp, int qlen,
            char *fmly)
{
    int res;
    static in_port_t port, *sinport;
    struct sockaddr_in6 myaddr;
    int i;
    struct t_bind tbindstr, *tres;
    struct t_info tinfo;
    extern mutex_t portnum_lock;

    /* VARIABLES PROTECTED BY portnum_lock: port */

#define STARTPORT 600
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS  (ENDPORT - STARTPORT + 1)

    if (sin == 0 && fmly == 0) {
        errno = EINVAL;
        return (-1);
    }
    if (geteuid()) {
        errno = EACCES;
        return (-1);
    }
    if ((i = t_getstate(fd)) != T_UNBND) {
        if (t_errno == TBADF)
            errno = EBADF;
        if (i != -1)
            errno = EISCONN;
        return (-1);
    }
    if (sin == 0) {
        sin = (struct sockaddr *)&myaddr;
        get_myaddress_ipv6(fmly, sin);
    }
    if (sin->sa_family == AF_INET) {
        /* LINTED pointer cast */
        sinport = &((struct sockaddr_in *)sin)->sin_port;
    } else if (sin->sa_family == AF_INET6) {
        /* LINTED pointer cast */
        sinport = &((struct sockaddr_in6 *)sin)->sin6_port;
    } else {
        errno = EPFNOSUPPORT;
        return (-1);
    }

    /* Transform sockaddr to netbuf */
    if (t_getinfo(fd, &tinfo) == -1) {
        return (-1);
    }
    /* LINTED pointer cast */
    tres = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR);
    if (tres == NULL)
        return (-1);

    tbindstr.qlen = qlen;
    tbindstr.addr.buf = (char *)sin;
    tbindstr.addr.len = tbindstr.addr.maxlen = __rpc_get_a_size(tinfo.addr);
    /* LINTED pointer cast */
    sin = (struct sockaddr *)tbindstr.addr.buf;

    res = -1;
    (void) mutex_lock(&portnum_lock);
    if (port == 0)
        port = (getpid() % NPORTS) + STARTPORT;
    for (i = 0; i < NPORTS; i++) {
        *sinport = htons(port++);
        if (port > ENDPORT)
            port = STARTPORT;
        res = t_bind(fd, &tbindstr, tres);
        if (res == 0) {
            if ((tbindstr.addr.len == tres->addr.len) &&
                (memcmp(tbindstr.addr.buf, tres->addr.buf,
                    (int)tres->addr.len) == 0))
                break;
            (void) t_unbind(fd);
            res = -1;
        } else if (t_errno != TSYSERR || errno != EADDRINUSE)
            break;
    }
    (void) mutex_unlock(&portnum_lock);

    if ((portp != NULL) && (res == 0))
        *portp = *sinport;
    (void) t_free((char *)tres, T_BIND);
    return (res);
}

int
__rpc_bindresvport(int fd, struct sockaddr_in *sin, int *portp, int qlen)
{
    return (__rpc_bindresvport_ipv6(fd, (struct sockaddr *)sin, portp,
                    qlen, NC_INET));
}

/*
 * Get clients IP address.
 * don't use gethostbyname, which would invoke yellow pages
 * Remains only for backward compatibility reasons.
 * Used mainly by the portmapper so that it can register
 * with itself. Also used by pmap*() routines
 */
void
get_myaddress_ipv6(char *fmly, struct sockaddr *addr)
{
    if (fmly != 0 && strcmp(fmly, NC_INET6) == 0) {
        /* LINTED pointer cast */
        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
        (void) memset(sin6, 0, sizeof (*sin6));
        sin6->sin6_family = AF_INET6;
        sin6->sin6_port = htons(PMAPPORT);
        if (__can_use_af(AF_INET6)) {
            /* Local copy of in6addr_any to avoid -lsocket */
            struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
            sin6->sin6_addr = in6addr_any;
        } else {
            struct in_addr in4;
            in4.s_addr = INADDR_ANY;
            IN6_INADDR_TO_V4MAPPED(&in4, &sin6->sin6_addr);
        }
    } else {
        /* LINTED pointer cast */
        struct sockaddr_in  *sin = (struct sockaddr_in *)addr;
        (void) memset(sin, 0, sizeof (*sin));
        sin->sin_family = AF_INET;
        sin->sin_port = htons(PMAPPORT);
        sin->sin_addr.s_addr = INADDR_ANY;
    }
}

void
get_myaddress(struct sockaddr_in *addr)
{
    get_myaddress_ipv6(0, (struct sockaddr *)addr);
}

/*
 * Get port used by specified service on specified host.
 * Exists for source compatibility only.
 * Obsoleted by rpcb_getaddr().
 */
ushort_t
getrpcport(char *host, rpcprog_t prognum, rpcvers_t versnum,
    rpcprot_t proto)
{
    struct sockaddr_in addr;
    struct hostent *hp;

    if ((hp = gethostbyname(host)) == NULL)
        return (0);
    (void) memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
    addr.sin_family = AF_INET;
    addr.sin_port =  0;
    return (pmap_getport(&addr, prognum, versnum, proto));
}

/*
 * For connectionless "udp" transport. Obsoleted by rpc_call().
 */
int
callrpc(char *host, rpcprog_t prognum, rpcvers_t versnum, rpcproc_t procnum,
    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
{
    return ((int)rpc_call(host, prognum, versnum, procnum, inproc,
                in, outproc, out, "udp"));
}

/*
 * For connectionless kind of transport. Obsoleted by rpc_reg()
 */
int
registerrpc(rpcprog_t prognum, rpcvers_t versnum, rpcproc_t procnum,
    char *(*progname)(), xdrproc_t inproc, xdrproc_t outproc)
{
    return (rpc_reg(prognum, versnum, procnum, progname, inproc,
                outproc, "udp"));
}

/*
 * All the following clnt_broadcast stuff is convulated; it supports
 * the earlier calling style of the callback function
 */
static pthread_key_t    clnt_broadcast_key;
static resultproc_t clnt_broadcast_result_main;

/*
 * Need to translate the netbuf address into sockaddr_in address.
 * Dont care about netid here.
 */
/* ARGSUSED2 */
static bool_t
rpc_wrap_bcast(char *resultp, struct netbuf *addr, struct netconfig *nconf)
{
    resultproc_t clnt_broadcast_result;

    clnt_broadcast_result = thr_main()? clnt_broadcast_result_main :
        (resultproc_t)pthread_getspecific(clnt_broadcast_key);
    return ((*clnt_broadcast_result)(resultp,
                /* LINTED pointer cast */
                (struct sockaddr_in *)addr->buf));
}

/*
 * Broadcasts on UDP transport. Obsoleted by rpc_broadcast().
 */
enum clnt_stat
clnt_broadcast(rpcprog_t prog, rpcvers_t vers, rpcproc_t proc, xdrproc_t xargs,
    caddr_t argsp, xdrproc_t xresults,
    caddr_t resultsp, resultproc_t eachresult)
{
    extern mutex_t tsd_lock;

    if (thr_main()) {
        clnt_broadcast_result_main = eachresult;
    } else {
        if (clnt_broadcast_key == 0) {
            (void) mutex_lock(&tsd_lock);
            if (clnt_broadcast_key == 0)
                (void) pthread_key_create(&clnt_broadcast_key,
                                    NULL);
            (void) mutex_unlock(&tsd_lock);
        }
        (void) pthread_setspecific(clnt_broadcast_key,
                            (void *)eachresult);
    }
    return (rpc_broadcast(prog, vers, proc, xargs, argsp, xresults,
                resultsp, (resultproc_t)rpc_wrap_bcast, "udp"));
}

/*
 * Create the client des authentication object. Obsoleted by
 * authdes_seccreate().
 */
AUTH *
authdes_create(char *servername, uint_t window, struct sockaddr_in *syncaddr,
    des_block *ckey)
{
    char *hostname = NULL;

    if (syncaddr) {
        /*
         * Change addr to hostname, because that is the way
         * new interface takes it.
         */
        struct netconfig *nconf;
        struct netbuf nb_syncaddr;
        struct nd_hostservlist *hlist;
        AUTH *nauth;
        int fd;
        struct t_info tinfo;

        if ((nconf = __rpc_getconfip("udp")) == NULL &&
            (nconf = __rpc_getconfip("tcp")) == NULL)
            goto fallback;

        /* Transform sockaddr_in to netbuf */
        if ((fd = t_open(nconf->nc_device, O_RDWR, &tinfo)) == -1) {
            (void) freenetconfigent(nconf);
            goto fallback;
        }
        (void) t_close(fd);
        nb_syncaddr.maxlen = nb_syncaddr.len =
            __rpc_get_a_size(tinfo.addr);
        nb_syncaddr.buf = (char *)syncaddr;
        if (netdir_getbyaddr(nconf, &hlist, &nb_syncaddr)) {
            (void) freenetconfigent(nconf);
            goto fallback;
        }
        if (hlist && hlist->h_cnt > 0 && hlist->h_hostservs)
            hostname = hlist->h_hostservs->h_host;
        nauth = authdes_seccreate(servername, window, hostname, ckey);
        (void) netdir_free((char *)hlist, ND_HOSTSERVLIST);
        (void) freenetconfigent(nconf);
        return (nauth);
    }
fallback:
    return (authdes_seccreate(servername, window, hostname, ckey));
}
#endif /* PORTMAP */