bool_t
pmap_set(u_long program, u_long version, int protocol, int port)
{
bool_t rslt;
struct netbuf *na;
struct netconfig *nconf;
char buf[32];
if ((protocol != IPPROTO_UDP) && (protocol != IPPROTO_TCP)) {
return (FALSE);
}
nconf = __rpc_getconfip(protocol == IPPROTO_UDP ? "udp" : "tcp");
if (nconf == NULL) {
return (FALSE);
}
snprintf(buf, sizeof buf, "0.0.0.0.%d.%d",
(((u_int32_t)port) >> 8) & 0xff, port & 0xff);
na = uaddr2taddr(nconf, buf);
if (na == NULL) {
freenetconfigent(nconf);
return (FALSE);
}
rslt = rpcb_set((rpcprog_t)program, (rpcvers_t)version, nconf, na);
free(na);
freenetconfigent(nconf);
return (rslt);
}
/*
* Returns 1 if the given address is bound for the given addr & transport
* For all error cases, we assume that the address is bound
* Returns 0 for success.
*/
static bool_t
check_bound(struct fdlist *fdl, char *uaddr)
{
int fd;
struct netbuf *na;
int ans;
if (fdl->check_binding == FALSE)
return (TRUE);
na = uaddr2taddr(fdl->nconf, uaddr);
if (!na)
return (TRUE); /* punt, should never happen */
fd = __rpc_nconf2fd(fdl->nconf);
if (fd < 0) {
free(na->buf);
free(na);
return (TRUE);
}
ans = bind(fd, (struct sockaddr *)na->buf, na->len);
close(fd);
free(na->buf);
free(na);
return (ans == 0 ? FALSE : TRUE);
}
/*
* Find a server address that can be used by `caller' to contact
* the local service specified by `serv_uaddr'. If `clnt_uaddr' is
* non-NULL, it is used instead of `caller' as a hint suggesting
* the best address (e.g. the `r_addr' field of an rpc, which
* contains the rpcbind server address that the caller used).
*
* Returns the best server address as a malloc'd "universal address"
* string which should be freed by the caller. On error, returns NULL.
*/
char *
addrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr,
const char *netid)
{
struct ifaddrs *ifap, *ifp = NULL, *bestif;
struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf;
struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa;
struct sockaddr_storage ss;
struct netconfig *nconf;
char *caller_uaddr = NULL;
const char *hint_uaddr = NULL;
char *ret = NULL;
int bestif_goodness;
#ifdef ND_DEBUG
if (debugging)
fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr,
clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid);
#endif
caller_sa = caller->buf;
if ((nconf = rpcbind_get_conf(netid)) == NULL)
goto freeit;
if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL)
goto freeit;
/*
* Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its
* address family is different from that of the caller.
*/
hint_sa = NULL;
if (clnt_uaddr != NULL) {
hint_uaddr = clnt_uaddr;
if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL)
goto freeit;
hint_sa = hint_nbp->buf;
}
if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) {
hint_uaddr = caller_uaddr;
hint_sa = caller->buf;
}
#ifdef ND_DEBUG
if (debugging)
fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr);
#endif
/* Local caller, just return the server address. */
if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 ||
strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') {
ret = strdup(serv_uaddr);
goto freeit;
}
if (getifaddrs(&ifp) < 0)
goto freeit;
/*
* Loop through all interface addresses. We are listening to an address
* if any of the following are true:
* a) It's a loopback address
* b) It was specified with the -h command line option
* c) There were no -h command line options.
*
* Among addresses on which we are listening, choose in order of
* preference an address that is:
*
* a) Equal to the hint
* b) A link local address with the same scope ID as the client's
* address, if the client's address is also link local
* c) An address on the same subnet as the client's address
* d) A non-localhost, non-p2p address
* e) Any usable address
*/
bestif = NULL;
bestif_goodness = 0;
for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
ifsa = ifap->ifa_addr;
ifmasksa = ifap->ifa_netmask;
/* Skip addresses where we don't listen */
if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family ||
!(ifap->ifa_flags & IFF_UP))
continue;
if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa))
continue;
if ((hint_sa->sa_family == AF_INET) &&
((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr ==
((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) {
const int goodness = 4;
bestif_goodness = goodness;
bestif = ifap;
goto found;
}
#ifdef INET6
if ((hint_sa->sa_family == AF_INET6) &&
(0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr,
&((struct sockaddr_in6*)ifsa)->sin6_addr,
sizeof(struct in6_addr))) &&
(((struct sockaddr_in6*)hint_sa)->sin6_scope_id ==
(((struct sockaddr_in6*)ifsa)->sin6_scope_id))) {
const int goodness = 4;
bestif_goodness = goodness;
bestif = ifap;
goto found;
}
if (hint_sa->sa_family == AF_INET6) {
/*
* For v6 link local addresses, if the caller is on
* a link-local address then use the scope id to see
* which one.
*/
if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) &&
IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) &&
IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) {
if (SA2SIN6(ifsa)->sin6_scope_id ==
SA2SIN6(caller_sa)->sin6_scope_id) {
const int goodness = 3;
if (bestif_goodness < goodness) {
bestif = ifap;
bestif_goodness = goodness;
}
}
}
}
#endif /* INET6 */
if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) {
const int goodness = 2;
if (bestif_goodness < goodness) {
bestif = ifap;
bestif_goodness = goodness;
}
}
if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
const int goodness = 1;
if (bestif_goodness < goodness) {
bestif = ifap;
bestif_goodness = goodness;
}
}
if (bestif == NULL)
bestif = ifap;
}
if (bestif == NULL)
goto freeit;
found:
/*
* Construct the new address using the address from
* `bestif', and the port number from `serv_uaddr'.
*/
serv_nbp = uaddr2taddr(nconf, serv_uaddr);
if (serv_nbp == NULL)
goto freeit;
serv_sa = serv_nbp->buf;
memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len);
switch (ss.ss_family) {
case AF_INET:
SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port;
break;
#ifdef INET6
case AF_INET6:
SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port;
break;
#endif
}
tbuf.len = ss.ss_len;
tbuf.maxlen = sizeof(ss);
tbuf.buf = &ss;
ret = taddr2uaddr(nconf, &tbuf);
freeit:
if (caller_uaddr != NULL)
free(caller_uaddr);
if (hint_nbp != NULL) {
free(hint_nbp->buf);
free(hint_nbp);
}
if (serv_nbp != NULL) {
free(serv_nbp->buf);
free(serv_nbp);
}
if (ifp != NULL)
freeifaddrs(ifp);
#ifdef ND_DEBUG
if (debugging)
fprintf(stderr, "addrmerge: returning %s\n", ret);
#endif
return ret;
}
/*
* rpc_broadcast_exp()
*
* prog - program number
* vers - version number
* proc - procedure number
* xargs - xdr routine for args
* argsp - pointer to args
* xresults - xdr routine for results
* resultsp - pointer to results
* eachresult - call with each result obtained
* inittime - how long to wait initially
* waittime - maximum time to wait
* nettype - transport type
*/
enum clnt_stat
rpc_broadcast_exp(rpcprog_t prog, rpcvers_t vers, rpcproc_t proc,
xdrproc_t xargs, caddr_t argsp, xdrproc_t xresults, caddr_t resultsp,
resultproc_t eachresult, int inittime, int waittime,
const char *nettype)
{
enum clnt_stat stat = RPC_SUCCESS; /* Return status */
XDR xdr_stream; /* XDR stream */
XDR *xdrs = &xdr_stream;
struct rpc_msg msg; /* RPC message */
struct timeval t;
char *outbuf = NULL; /* Broadcast msg buffer */
char *inbuf = NULL; /* Reply buf */
int inlen;
u_int maxbufsize = 0;
AUTH *sys_auth = authunix_create_default();
u_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";
if ((handle = __rpc_setconf(nettype)) == NULL) {
AUTH_DESTROY(sys_auth);
return (RPC_UNKNOWNPROTO);
}
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) {
udpbufsz = fdlist[fdlistno].dsize;
if ((outbuf_pmap = malloc(udpbufsz)) == NULL) {
_close(fd);
stat = RPC_SYSTEMERROR;
goto done_broad;
}
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 = malloc(maxbufsize);
outbuf = malloc(maxbufsize);
if ((inbuf == NULL) || (outbuf == NULL)) {
stat = RPC_SYSTEMERROR;
goto done_broad;
}
/* Serialize all the arguments which have to be sent */
(void) gettimeofday(&t, NULL);
msg.rm_xid = __RPC_GETXID(&t);
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) {
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("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("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_t 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("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 taddr, *np;
struct sockaddr_in *sin;
#ifdef PORTMAP
if (pmap_flag && pmap_reply_flag) {
sin = (struct sockaddr_in *)
(void *)&fdlist[i].raddr;
sin->sin_port =
htons((u_short)port);
taddr.len = taddr.maxlen =
fdlist[i].raddr.ss_len;
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);
free(np);
#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:
free(inbuf);
free(outbuf);
#ifdef PORTMAP
free(outbuf_pmap);
#endif /* PORTMAP */
for (i = 0; i < fdlistno; i++) {
(void)_close(fdlist[i].fd);
__rpc_freebroadifs(&fdlist[i].nal);
}
AUTH_DESTROY(sys_auth);
(void) __rpc_endconf(handle);
return (stat);
}
char *
addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr,
char *netid)
{
struct ifaddrs *ifap, *ifp, *bestif;
#ifdef INET6
struct sockaddr_in6 *servsin6, *sin6mask, *clntsin6, *ifsin6, *realsin6;
struct sockaddr_in6 *newsin6;
#endif
struct sockaddr_in *servsin, *sinmask, *clntsin, *newsin, *ifsin;
struct netbuf *serv_nbp, *clnt_nbp = NULL, tbuf;
struct sockaddr *serv_sa;
struct sockaddr *clnt_sa;
struct sockaddr_storage ss;
struct netconfig *nconf;
struct sockaddr *clnt = caller->buf;
char *ret = NULL;
#ifdef INET6
servsin6 = ifsin6 = newsin6 = NULL; /* XXXGCC -Wuninitialized */
#endif
servsin = newsin = NULL; /* XXXGCC -Wuninitialized */
#ifdef RPCBIND_DEBUG
if (debugging)
fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr,
clnt_uaddr, netid);
#endif
nconf = getnetconfigent(netid);
if (nconf == NULL)
return NULL;
/*
* Local merge, just return a duplicate.
*/
if (clnt_uaddr != NULL && strncmp(clnt_uaddr, "0.0.0.0.", 8) == 0)
return strdup(clnt_uaddr);
serv_nbp = uaddr2taddr(nconf, serv_uaddr);
if (serv_nbp == NULL)
return NULL;
serv_sa = (struct sockaddr *)serv_nbp->buf;
if (clnt_uaddr != NULL) {
clnt_nbp = uaddr2taddr(nconf, clnt_uaddr);
if (clnt_nbp == NULL) {
free(serv_nbp);
return NULL;
}
clnt_sa = (struct sockaddr *)clnt_nbp->buf;
if (clnt_sa->sa_family == AF_LOCAL) {
free(serv_nbp);
free(clnt_nbp);
free(clnt_sa);
return strdup(serv_uaddr);
}
} else {
clnt_sa = (struct sockaddr *)
malloc(sizeof (struct sockaddr_storage));
memcpy(clnt_sa, clnt, clnt->sa_len);
}
if (getifaddrs(&ifp) < 0) {
free(serv_nbp);
free(clnt_sa);
if (clnt_nbp != NULL)
free(clnt_nbp);
return 0;
}
/*
* Loop through all interfaces. For each interface, see if the
* network portion of its address is equal to that of the client.
* If so, we have found the interface that we want to use.
*/
for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
if (ifap->ifa_addr->sa_family != clnt->sa_family ||
!(ifap->ifa_flags & IFF_UP))
continue;
switch (clnt->sa_family) {
case AF_INET:
/*
* realsin: address that recvfrom gave us.
* ifsin: address of interface being examined.
* clntsin: address that client want us to contact
* it on
* servsin: local address of RPC service.
* sinmask: netmask of this interface
* newsin: initially a copy of clntsin, eventually
* the merged address
*/
servsin = (struct sockaddr_in *)serv_sa;
clntsin = (struct sockaddr_in *)clnt_sa;
sinmask = (struct sockaddr_in *)ifap->ifa_netmask;
newsin = (struct sockaddr_in *)&ss;
ifsin = (struct sockaddr_in *)ifap->ifa_addr;
if (!bitmaskcmp(&ifsin->sin_addr, &clntsin->sin_addr,
&sinmask->sin_addr, sizeof (struct in_addr))) {
goto found;
}
break;
#ifdef INET6
case AF_INET6:
/*
* realsin6: address that recvfrom gave us.
* ifsin6: address of interface being examined.
* clntsin6: address that client want us to contact
* it on
* servsin6: local address of RPC service.
* sin6mask: netmask of this interface
* newsin6: initially a copy of clntsin, eventually
* the merged address
*
* For v6 link local addresses, if the client contacted
* us via a link-local address, and wants us to reply
* to one, use the scope id to see which one.
*/
realsin6 = (struct sockaddr_in6 *)clnt;
ifsin6 = (struct sockaddr_in6 *)ifap->ifa_addr;
in6_fillscopeid(ifsin6);
clntsin6 = (struct sockaddr_in6 *)clnt_sa;
servsin6 = (struct sockaddr_in6 *)serv_sa;
sin6mask = (struct sockaddr_in6 *)ifap->ifa_netmask;
newsin6 = (struct sockaddr_in6 *)&ss;
if (IN6_IS_ADDR_LINKLOCAL(&ifsin6->sin6_addr) &&
IN6_IS_ADDR_LINKLOCAL(&realsin6->sin6_addr) &&
IN6_IS_ADDR_LINKLOCAL(&clntsin6->sin6_addr)) {
if (ifsin6->sin6_scope_id !=
realsin6->sin6_scope_id)
continue;
goto found;
}
if (!bitmaskcmp(&ifsin6->sin6_addr,
&clntsin6->sin6_addr, &sin6mask->sin6_addr,
sizeof (struct in6_addr)))
goto found;
break;
#endif
default:
goto freeit;
}
}
/*
* Didn't find anything. Get the first possibly useful interface,
* preferring "normal" interfaces to point-to-point and loopback
* ones.
*/
bestif = NULL;
for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
if (ifap->ifa_addr->sa_family != clnt->sa_family ||
!(ifap->ifa_flags & IFF_UP))
continue;
if (!(ifap->ifa_flags & IFF_LOOPBACK) &&
!(ifap->ifa_flags & IFF_POINTOPOINT)) {
bestif = ifap;
break;
}
if (bestif == NULL)
bestif = ifap;
else if ((bestif->ifa_flags & IFF_LOOPBACK) &&
!(ifap->ifa_flags & IFF_LOOPBACK))
bestif = ifap;
}
ifap = bestif;
found:
switch (clnt->sa_family) {
case AF_INET:
memcpy(newsin, ifap->ifa_addr, clnt_sa->sa_len);
newsin->sin_port = servsin->sin_port;
tbuf.len = clnt_sa->sa_len;
tbuf.maxlen = sizeof (struct sockaddr_storage);
tbuf.buf = newsin;
break;
#ifdef INET6
case AF_INET6:
assert(newsin6);
memcpy(newsin6, ifsin6, clnt_sa->sa_len);
newsin6->sin6_port = servsin6->sin6_port;
tbuf.maxlen = sizeof (struct sockaddr_storage);
tbuf.len = clnt_sa->sa_len;
tbuf.buf = newsin6;
break;
#endif
default:
goto freeit;
}
if (ifap != NULL)
ret = taddr2uaddr(nconf, &tbuf);
freeit:
freenetconfigent(nconf);
free(serv_sa);
free(serv_nbp);
if (clnt_sa != NULL)
free(clnt_sa);
if (clnt_nbp != NULL)
free(clnt_nbp);
freeifaddrs(ifp);
#ifdef RPCBIND_DEBUG
if (debugging)
fprintf(stderr, "addrmerge: returning %s\n", ret);
#endif
return ret;
}
