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/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - 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.
* - Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
/*
* Copyright (c) 1986-1991 by Sun Microsystems Inc.
*/
#include <config.h>
#include <sys/cdefs.h>
/*
* clnt_bcast.c
* Client interface to broadcast service.
*
* Copyright (C) 1988, Sun Microsystems, Inc.
*
* The following is kludged-up support for simple rpc broadcasts.
* Someday a large, complicated system will replace these routines.
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <misc/queue.h>
#include <net/if.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#include <sys/poll.h>
#include <rpc/types.h>
#include <misc/portable.h>
#include <rpc/rpc.h>
#ifdef PORTMAP
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_rmt.h>
#endif /* PORTMAP */
#include <rpc/nettype.h>
#include <arpa/inet.h>
#ifdef RPC_DEBUG
#include <stdio.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <err.h>
#include <string.h>
#include "rpc_com.h"
#define MAXBCAST 20 /* Max no of broadcasting transports */
#define INITTIME 4000 /* Time to wait initially */
#define WAITTIME 8000 /* Maximum time to wait */
/*
* If nettype is NULL, it broadcasts on all the available
* datagram_n transports. May potentially lead to broadacst storms
* and hence should be used with caution, care and courage.
*
* The current parameter xdr packet size is limited by the max tsdu
* size of the transport. If the max tsdu size of any transport is
* smaller than the parameter xdr packet, then broadcast is not
* sent on that transport.
*
* Also, the packet size should be less the packet size of
* the data link layer (for ethernet it is 1400 bytes). There is
* no easy way to find out the max size of the data link layer and
* we are assuming that the args would be smaller than that.
*
* The result size has to be smaller than the transport tsdu size.
*
* If PORTMAP has been defined, we send two packets for UDP, one for
* rpcbind and one for portmap. For those machines which support
* both rpcbind and portmap, it will cause them to reply twice, and
* also here it will get two responses ... inefficient and clumsy.
*/
#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
#define TAILQ_FIRST(head) ((head)->tqh_first)
struct broadif {
int index;
struct sockaddr_storage broadaddr;
TAILQ_ENTRY(broadif) link;
};
typedef TAILQ_HEAD(, broadif) broadlist_t;
int __rpc_getbroadifs(int, int, int, broadlist_t *);
void __rpc_freebroadifs(broadlist_t *);
int __rpc_broadenable(int, int, struct broadif *);
int __rpc_lowvers = 0;
int
__rpc_getbroadifs(int af, int proto, int socktype, broadlist_t *list)
{
int count = 0;
struct broadif *bip;
struct ifaddrs *ifap, *ifp;
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
struct sockaddr_in *sin;
struct addrinfo hints, *res;
if (getifaddrs(&ifp) < 0)
return 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_protocol = proto;
hints.ai_socktype = socktype;
if (getaddrinfo(NULL, "sunrpc", &hints, &res) != 0)
return 0;
for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
if (ifap->ifa_addr->sa_family != af
|| !(ifap->ifa_flags & IFF_UP))
continue;
bip = (struct broadif *)mem_alloc(sizeof(*bip));
if (bip == NULL)
break;
bip->index = if_nametoindex(ifap->ifa_name);
if (
#ifdef INET6
af != AF_INET6 &&
#endif
(ifap->ifa_flags & IFF_BROADCAST)
&& ifap->ifa_broadaddr) {
/* memcpy(&bip->broadaddr, ifap->ifa_broadaddr,
(size_t)ifap->ifa_broadaddr->sa_len); */
memcpy(&bip->broadaddr, ifap->ifa_broadaddr,
sizeof(bip->broadaddr));
sin = (struct sockaddr_in *)(void *)&bip->broadaddr;
sin->sin_port = ((struct sockaddr_in *)
(void *)res->ai_addr)->sin_port;
} else
#ifdef INET6
if (af == AF_INET6 && (ifap->ifa_flags & IFF_MULTICAST)) {
sin6 = (struct sockaddr_in6 *)(void *)&bip->broadaddr;
inet_pton(af, RPCB_MULTICAST_ADDR, &sin6->sin6_addr);
sin6->sin6_family = af;
sin6->sin6_port = ((struct sockaddr_in6 *)
(void *)res->ai_addr)->sin6_port;
sin6->sin6_scope_id = bip->index;
} else
#endif
{
mem_free(bip, 0);
continue;
}
TAILQ_INSERT_TAIL(list, bip, link);
count++;
}
freeifaddrs(ifp);
freeaddrinfo(res);
return count;
}
void
__rpc_freebroadifs(broadlist_t *list)
{
struct broadif *bip, *next;
bip = TAILQ_FIRST(list);
while (bip != NULL) {
next = TAILQ_NEXT(bip, link);
mem_free(bip, 0);
bip = next;
}
}
int /*ARGSUSED*/
__rpc_broadenable(int af, int s, struct broadif *bip)
{
int o = 1;
#if 0
if (af == AF_INET6) {
fprintf(stderr, "set v6 multicast if to %d\n", bip->index);
if (setsockopt
(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &bip->index,
sizeof(bip->index)) < 0)
return -1;
} else
#endif
if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &o, sizeof(o)) < 0)
return -1;
return 0;
}
enum clnt_stat
rpc_broadcast_exp(rpcprog_t prog, /* program number */
rpcvers_t vers, /* version number */
rpcproc_t proc, /* procedure number */
xdrproc_t xargs, /* xdr routine for args */
caddr_t argsp, /* pointer to args */
xdrproc_t xresults, /* xdr routine for results */
caddr_t resultsp, /* pointer to results */
resultproc_t eachresult, /* call with each result obtained */
int inittime, /* how long to wait initially */
int waittime, /* maximum time to wait */
const char *nettype /* transport type */)
{
enum clnt_stat stat = RPC_SUCCESS; /* Return status */
XDR xdr_stream; /* XDR stream */
XDR *xdrs = &xdr_stream;
struct rpc_msg msg; /* RPC message */
struct timespec ts;
char *outbuf = NULL; /* Broadcast msg buffer */
char *inbuf = NULL; /* Reply buf */
int inlen;
u_int maxbufsize = 0;
AUTH *sys_auth = authunix_ncreate_default();
int i;
void *handle;
char uaddress[1024]; /* A self imposed limit */
char *uaddrp = uaddress;
int pmap_reply_flag; /* reply recvd from PORTMAP */
/* An array of all the suitable broadcast transports */
struct {
int fd; /* File descriptor */
int af;
int proto;
struct netconfig *nconf; /* Netconfig structure */
u_int asize; /* Size of the addr buf */
u_int dsize; /* Size of the data buf */
struct sockaddr_storage raddr; /* Remote address */
broadlist_t nal;
} fdlist[MAXBCAST];
struct pollfd pfd[MAXBCAST];
size_t fdlistno = 0;
struct r_rpcb_rmtcallargs barg; /* Remote arguments */
struct r_rpcb_rmtcallres bres; /* Remote results */
size_t outlen;
struct netconfig *nconf;
int msec;
int pollretval;
int fds_found;
#ifdef PORTMAP
size_t outlen_pmap = 0;
u_long port; /* Remote port number */
int pmap_flag = 0; /* UDP exists ? */
char *outbuf_pmap = NULL;
struct rmtcallargs barg_pmap; /* Remote arguments */
struct rmtcallres bres_pmap; /* Remote results */
u_int udpbufsz = 0;
#endif /* PORTMAP */
if (sys_auth == NULL)
return (RPC_SYSTEMERROR);
/*
* initialization: create a fd, a broadcast address, and send the
* request on the broadcast transport.
* Listen on all of them and on replies, call the user supplied
* function.
*/
if (nettype == NULL)
nettype = "datagram_n";
handle = __rpc_setconf(nettype);
if (handle == NULL) {
stat = RPC_UNKNOWNPROTO;
goto cleanup;
}
while ((nconf = __rpc_getconf(handle)) != NULL) {
int fd;
struct __rpc_sockinfo si;
if (nconf->nc_semantics != NC_TPI_CLTS)
continue;
if (fdlistno >= MAXBCAST)
break; /* No more slots available */
if (!__rpc_nconf2sockinfo(nconf, &si))
continue;
TAILQ_INIT(&fdlist[fdlistno].nal);
if (__rpc_getbroadifs
(si.si_af, si.si_proto, si.si_socktype,
&fdlist[fdlistno].nal) == 0)
continue;
fd = socket(si.si_af, si.si_socktype, si.si_proto);
if (fd < 0) {
stat = RPC_CANTSEND;
continue;
}
fdlist[fdlistno].af = si.si_af;
fdlist[fdlistno].proto = si.si_proto;
fdlist[fdlistno].fd = fd;
fdlist[fdlistno].nconf = nconf;
fdlist[fdlistno].asize = __rpc_get_a_size(si.si_af);
pfd[fdlistno].events =
POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND;
pfd[fdlistno].fd = fdlist[fdlistno].fd = fd;
fdlist[fdlistno].dsize =
__rpc_get_t_size(si.si_af, si.si_proto, 0);
if (maxbufsize <= fdlist[fdlistno].dsize)
maxbufsize = fdlist[fdlistno].dsize;
#ifdef PORTMAP
if (si.si_af == AF_INET && si.si_proto == IPPROTO_UDP) {
if (udpbufsz < fdlist[fdlistno].dsize)
udpbufsz = fdlist[fdlistno].dsize;
pmap_flag = 1;
}
#endif /* PORTMAP */
fdlistno++;
}
if (fdlistno == 0) {
if (stat == RPC_SUCCESS)
stat = RPC_UNKNOWNPROTO;
goto done_broad;
}
if (maxbufsize == 0) {
if (stat == RPC_SUCCESS)
stat = RPC_CANTSEND;
goto done_broad;
}
inbuf = mem_alloc(maxbufsize);
outbuf = mem_alloc(maxbufsize);
if ((inbuf == NULL) || (outbuf == NULL)) {
stat = RPC_SYSTEMERROR;
goto done_broad;
}
/* Serialize all the arguments which have to be sent */
(void)clock_gettime(CLOCK_MONOTONIC_FAST, &ts);
msg.rm_xid = __RPC_GETXID(&ts);
msg.rm_direction = CALL;
msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
msg.rm_call.cb_prog = RPCBPROG;
msg.rm_call.cb_vers = RPCBVERS;
msg.rm_call.cb_proc = RPCBPROC_CALLIT;
barg.prog = prog;
barg.vers = vers;
barg.proc = proc;
barg.args.args_val = argsp;
barg.xdr_args = xargs;
bres.addr = uaddrp;
bres.results.results_val = resultsp;
bres.xdr_res = xresults;
msg.rm_call.cb_cred = sys_auth->ah_cred;
msg.rm_call.cb_verf = sys_auth->ah_verf;
xdrmem_create(xdrs, outbuf, maxbufsize, XDR_ENCODE);
if ((!xdr_callmsg(xdrs, &msg))
||
(!xdr_rpcb_rmtcallargs
(xdrs, (struct rpcb_rmtcallargs *)(void *)&barg))) {
stat = RPC_CANTENCODEARGS;
goto done_broad;
}
outlen = xdr_getpos(xdrs);
xdr_destroy(xdrs);
#ifdef PORTMAP
/* Prepare the packet for version 2 PORTMAP */
if (pmap_flag) {
outbuf_pmap = mem_alloc(udpbufsz);
if (outbuf_pmap == NULL) {
stat = RPC_SYSTEMERROR;
goto done_broad;
}
msg.rm_xid++; /* One way to distinguish */
msg.rm_call.cb_prog = PMAPPROG;
msg.rm_call.cb_vers = PMAPVERS;
msg.rm_call.cb_proc = PMAPPROC_CALLIT;
barg_pmap.prog = prog;
barg_pmap.vers = vers;
barg_pmap.proc = proc;
barg_pmap.args_ptr = argsp;
barg_pmap.xdr_args = xargs;
bres_pmap.port_ptr = &port;
bres_pmap.xdr_results = xresults;
bres_pmap.results_ptr = resultsp;
xdrmem_create(xdrs, outbuf_pmap, udpbufsz, XDR_ENCODE);
if ((!xdr_callmsg(xdrs, &msg))
|| (!xdr_rmtcall_args(xdrs, &barg_pmap))) {
stat = RPC_CANTENCODEARGS;
goto done_broad;
}
outlen_pmap = xdr_getpos(xdrs);
xdr_destroy(xdrs);
}
#endif /* PORTMAP */
/*
* Basic loop: broadcast the packets to transports which
* support data packets of size such that one can encode
* all the arguments.
* Wait a while for response(s).
* The response timeout grows larger per iteration.
*/
for (msec = inittime; msec <= waittime; msec += msec) {
struct broadif *bip;
/* Broadcast all the packets now */
for (i = 0; i < fdlistno; i++) {
if (fdlist[i].dsize < outlen) {
stat = RPC_CANTSEND;
continue;
}
for (bip = TAILQ_FIRST(&fdlist[i].nal); bip != NULL;
bip = TAILQ_NEXT(bip, link)) {
void *addr;
addr = &bip->broadaddr;
__rpc_broadenable(fdlist[i].af, fdlist[i].fd,
bip);
/*
* Only use version 3 if lowvers is not set
*/
if (!__rpc_lowvers)
if (sendto
(fdlist[i].fd, outbuf, outlen, 0,
(struct sockaddr *)addr,
(size_t) fdlist[i].asize) !=
outlen) {
#ifdef RPC_DEBUG
perror("sendto");
#endif
__warnx
(TIRPC_DEBUG_FLAG_CLNT_BCAST,
"clnt_bcast: cannot send "
"broadcast packet");
stat = RPC_CANTSEND;
continue;
};
#ifdef RPC_DEBUG
if (!__rpc_lowvers)
fprintf(stderr,
"Broadcast packet sent "
"for %s\n",
fdlist[i].nconf->nc_netid);
#endif
#ifdef PORTMAP
/*
* Send the version 2 packet also
* for UDP/IP
*/
if (pmap_flag && fdlist[i].proto
== IPPROTO_UDP) {
if (sendto
(fdlist[i].fd, outbuf_pmap,
outlen_pmap, 0, addr,
(size_t) fdlist[i].asize) !=
outlen_pmap) {
__warnx
(TIRPC_DEBUG_FLAG_CLNT_BCAST,
"clnt_bcast: Cannot send "
"broadcast packet");
stat = RPC_CANTSEND;
continue;
}
}
#ifdef RPC_DEBUG
fprintf(stderr,
"PMAP Broadcast packet "
"sent for %s\n",
fdlist[i].nconf->nc_netid);
#endif
#endif /* PORTMAP */
}
/* End for sending all packets on this transport */
} /* End for sending on all transports */
if (eachresult == NULL) {
stat = RPC_SUCCESS;
goto done_broad;
}
/*
* Get all the replies from these broadcast requests
*/
recv_again:
switch (pollretval = poll(pfd, fdlistno, msec)) {
case 0: /* timed out */
stat = RPC_TIMEDOUT;
continue;
case -1: /* some kind of error - we ignore it */
goto recv_again;
} /* end of poll results switch */
for (i = fds_found = 0; i < fdlistno && fds_found < pollretval;
i++) {
bool done = false;
if (pfd[i].revents == 0)
continue;
else if (pfd[i].revents & POLLNVAL) {
/*
* Something bad has happened to this descri-
* ptor. We can cause _poll() to ignore
* it simply by using a negative fd. We do that
* rather than compacting the pfd[] and fdlist[]
* arrays.
*/
pfd[i].fd = -1;
fds_found++;
continue;
} else
fds_found++;
#ifdef RPC_DEBUG
fprintf(stderr, "response for %s\n",
fdlist[i].nconf->nc_netid);
#endif
try_again:
inlen =
recvfrom(fdlist[i].fd, inbuf, fdlist[i].dsize, 0,
(struct sockaddr *)(void *)
&fdlist[i].raddr, &fdlist[i].asize);
if (inlen < 0) {
if (errno == EINTR)
goto try_again;
__warnx(TIRPC_DEBUG_FLAG_CLNT_BCAST,
"clnt_bcast: Cannot receive reply to broadcast");
stat = RPC_CANTRECV;
continue;
}
if (inlen < sizeof(u_int32_t))
continue; /* Drop that and go ahead */
/*
* see if reply transaction id matches sent id.
* If so, decode the results. If return id is xid + 1
* it was a PORTMAP reply
*/
if (*((u_int32_t *) (void *)(inbuf)) ==
*((u_int32_t *) (void *)(outbuf))) {
pmap_reply_flag = 0;
msg.acpted_rply.ar_verf = _null_auth;
msg.acpted_rply.ar_results.where =
(caddr_t) (void *)&bres;
msg.acpted_rply.ar_results.proc =
(xdrproc_t) xdr_rpcb_rmtcallres;
#ifdef PORTMAP
} else if (pmap_flag
&& *((u_int32_t *) (void *)(inbuf)) ==
*((u_int32_t *) (void *)(outbuf_pmap))) {
pmap_reply_flag = 1;
msg.acpted_rply.ar_verf = _null_auth;
msg.acpted_rply.ar_results.where =
(caddr_t) (void *)&bres_pmap;
msg.acpted_rply.ar_results.proc =
(xdrproc_t) xdr_rmtcallres;
#endif /* PORTMAP */
} else
continue;
xdrmem_create(xdrs, inbuf, (u_int) inlen, XDR_DECODE);
if (xdr_replymsg(xdrs, &msg)) {
if ((msg.rm_reply.rp_stat == MSG_ACCEPTED)
&& (msg.acpted_rply.ar_stat == SUCCESS)) {
struct netbuf *np;
#ifdef PORTMAP
struct netbuf taddr;
struct sockaddr_in sin;
if (pmap_flag && pmap_reply_flag) {
memcpy(&sin, &fdlist[i].raddr,
sizeof(sin));
sin.sin_port =
htons((u_short) port);
memcpy(&fdlist[i].raddr, &sin,
sizeof(sin));
taddr.len = taddr.maxlen =
sizeof(fdlist[i].raddr);
taddr.buf = &fdlist[i].raddr;
done =
(*eachresult) (resultsp,
&taddr,
fdlist[i].
nconf);
} else {
#endif /* PORTMAP */
#ifdef RPC_DEBUG
fprintf(stderr, "uaddr %s\n",
uaddrp);
#endif
np = uaddr2taddr(fdlist[i].
nconf, uaddrp);
done =
(*eachresult) (resultsp, np,
fdlist[i].
nconf);
mem_free(np, 0);
#ifdef PORTMAP
}
#endif /* PORTMAP */
}
/* otherwise, we just ignore the errors ... */
}
/* else some kind of deserialization problem ... */
xdrs->x_op = XDR_FREE;
msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
(void)xdr_replymsg(xdrs, &msg);
(void)(*xresults) (xdrs, resultsp);
XDR_DESTROY(xdrs);
if (done) {
stat = RPC_SUCCESS;
goto done_broad;
} else {
goto recv_again;
}
} /* The recv for loop */
} /* The giant for loop */
done_broad:
if (inbuf)
mem_free(inbuf, 0);
if (outbuf)
mem_free(outbuf, 0);
#ifdef PORTMAP
if (outbuf_pmap)
mem_free(outbuf_pmap, 0);
#endif /* PORTMAP */
for (i = 0; i < fdlistno; i++) {
(void)close(fdlist[i].fd);
__rpc_freebroadifs(&fdlist[i].nal);
}
cleanup:
AUTH_DESTROY(sys_auth);
(void)__rpc_endconf(handle);
return (stat);
}
enum clnt_stat
rpc_broadcast(rpcprog_t prog, /* program number */
rpcvers_t vers, /* version number */
rpcproc_t proc, /* procedure number */
xdrproc_t xargs, /* xdr routine for args */
caddr_t argsp, /* pointer to args */
xdrproc_t xresults, /* xdr routine for results */
caddr_t resultsp, /* pointer to results */
resultproc_t eachresult, /* call with each result obtained */
const char *nettype /* transport type */)
{
enum clnt_stat dummy;
dummy =
rpc_broadcast_exp(prog, vers, proc, xargs, argsp, xresults,
resultsp, eachresult, INITTIME, WAITTIME,
nettype);
return (dummy);
}