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NetBSD/usr.sbin/ypbind/ypbind.c

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/*
* Copyright (c) 1992/3 Theo de Raadt <deraadt@fsa.ca>
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef LINT
static char rcsid[] = "$Id: ypbind.c,v 1.2 1993/05/16 02:48:49 deraadt Exp $";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#include <sys/syslog.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <netdb.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_rmt.h>
#include <unistd.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#ifndef BINDINGDIR
#define BINDINGDIR "/var/yp/binding"
#endif
struct _dom_binding {
struct _dom_binding *dom_pnext;
char dom_domain[YPMAXDOMAIN + 1];
struct sockaddr_in dom_server_addr;
unsigned short int dom_server_port;
int dom_socket;
CLIENT *dom_client;
long int dom_vers;
time_t dom_check_t;
int dom_lockfd;
int dom_alive;
};
extern bool_t xdr_domainname(), xdr_ypbind_resp();
extern bool_t xdr_ypreq_key(), xdr_ypresp_val();
extern bool_t xdr_ypbind_setdom();
char *domainname;
struct _dom_binding *ypbindlist;
int check;
#define YPSET_NO 0
#define YPSET_LOCAL 1
#define YPSET_ALL 2
int ypsetmode = YPSET_NO;
int rpcsock;
struct rmtcallargs rmtca;
struct rmtcallres rmtcr;
char rmtcr_outval;
u_long rmtcr_port;
void *
ypbindproc_null_2(transp, argp, clnt)
SVCXPRT *transp;
void *argp;
CLIENT *clnt;
{
static char res;
bzero((char *)&res, sizeof(res));
return (void *)&res;
}
struct ypbind_resp *
ypbindproc_domain_2(transp, argp, clnt)
SVCXPRT *transp;
char *argp;
CLIENT *clnt;
{
static struct ypbind_resp res;
struct _dom_binding *ypdb;
char path[MAXPATHLEN];
bzero((char *)&res, sizeof res);
res.ypbind_status = YPBIND_FAIL_VAL;
for(ypdb=ypbindlist; ypdb; ypdb=ypdb->dom_pnext)
if( strcmp(ypdb->dom_domain, argp) == 0)
break;
if(ypdb==NULL) {
ypdb = (struct _dom_binding *)malloc(sizeof *ypdb);
bzero((char *)ypdb, sizeof *ypdb);
strncpy(ypdb->dom_domain, argp, sizeof ypdb->dom_domain);
ypdb->dom_vers = YPVERS;
ypdb->dom_alive = 0;
ypdb->dom_lockfd = -1;
sprintf(path, "%s/%s.%d", BINDINGDIR, ypdb->dom_domain, ypdb->dom_vers);
unlink(path);
ypdb->dom_pnext = ypbindlist;
ypbindlist = ypdb;
check++;
return NULL;
}
if(ypdb->dom_alive==0)
return NULL;
#if 0
delta = ypdb->dom_check_t - ypdb->dom_ask_t;
if( !(ypdb->dom_ask_t==0 || delta > 5)) {
ypdb->dom_ask_t = time(NULL);
/*
* Hmm. More than 2 requests in 5 seconds have indicated that my
* binding is possibly incorrect. Ok, make myself unalive, and
* find out what the actual state is.
*/
if(ypdb->dom_lockfd!=-1)
close(ypdb->dom_lockfd);
ypdb->dom_lockfd = -1;
ypdb->dom_alive = 0;
ypdb->dom_lockfd = -1;
sprintf(path, "%s/%s.%d", BINDINGDIR, ypdb->dom_domain, ypdb->dom_vers);
unlink(path);
check++;
return NULL;
}
#endif
answer:
res.ypbind_status = YPBIND_SUCC_VAL;
res.ypbind_respbody.ypbind_bindinfo.ypbind_binding_addr.s_addr =
ypdb->dom_server_addr.sin_addr.s_addr;
res.ypbind_respbody.ypbind_bindinfo.ypbind_binding_port =
ypdb->dom_server_port;
/*printf("domain %s at %s/%d\n", ypdb->dom_domain,
inet_ntoa(ypdb->dom_server_addr.sin_addr),
ntohs(ypdb->dom_server_addr.sin_port));*/
return &res;
}
bool_t *
ypbindproc_setdom_2(transp, argp, clnt)
SVCXPRT *transp;
struct ypbind_setdom *argp;
CLIENT *clnt;
{
struct sockaddr_in *fromsin, bindsin;
char res;
bzero((char *)&res, sizeof(res));
fromsin = svc_getcaller(transp);
switch(ypsetmode) {
case YPSET_LOCAL:
if( fromsin->sin_addr.s_addr != htonl(INADDR_LOOPBACK))
return (void *)NULL;
break;
case YPSET_ALL:
break;
case YPSET_NO:
default:
return (void *)NULL;
}
if(argp->ypsetdom_vers != YPVERS)
return (void *)&res;
bzero((char *)&bindsin, sizeof bindsin);
bindsin.sin_family = AF_INET;
bindsin.sin_addr.s_addr = argp->ypsetdom_addr.s_addr;
bindsin.sin_port = argp->ypsetdom_port;
rpc_received(argp->ypsetdom_domain, &bindsin, 1);
res = 1;
return (void *)&res;
}
static void
ypbindprog_2(rqstp, transp)
struct svc_req *rqstp;
register SVCXPRT *transp;
{
union {
char ypbindproc_domain_2_arg[MAXHOSTNAMELEN];
struct ypbind_setdom ypbindproc_setdom_2_arg;
} argument;
struct authunix_parms *creds;
char *result;
bool_t (*xdr_argument)(), (*xdr_result)();
char *(*local)();
switch (rqstp->rq_proc) {
case YPBINDPROC_NULL:
xdr_argument = xdr_void;
xdr_result = xdr_void;
local = (char *(*)()) ypbindproc_null_2;
break;
case YPBINDPROC_DOMAIN:
xdr_argument = xdr_domainname;
xdr_result = xdr_ypbind_resp;
local = (char *(*)()) ypbindproc_domain_2;
break;
case YPBINDPROC_SETDOM:
switch(rqstp->rq_cred.oa_flavor) {
case AUTH_UNIX:
creds = (struct authunix_parms *)rqstp->rq_clntcred;
if( creds->aup_uid != 0) {
svcerr_auth(transp, AUTH_BADCRED);
return;
}
break;
default:
svcerr_auth(transp, AUTH_TOOWEAK);
return;
}
xdr_argument = xdr_ypbind_setdom;
xdr_result = xdr_void;
local = (char *(*)()) ypbindproc_setdom_2;
break;
default:
svcerr_noproc(transp);
return;
}
bzero((char *)&argument, sizeof(argument));
if (!svc_getargs(transp, xdr_argument, &argument)) {
svcerr_decode(transp);
return;
}
result = (*local)(transp, &argument, rqstp);
if (result != NULL && !svc_sendreply(transp, xdr_result, result)) {
svcerr_systemerr(transp);
}
return;
}
main(argc, argv)
char **argv;
{
char path[MAXPATHLEN];
struct timeval tv;
SVCXPRT *transp;
fd_set fdsr;
int width;
int i;
yp_get_default_domain(&domainname);
if( domainname[0] == '\0') {
fprintf(stderr, "domainname not set. Aborting.\n");
exit(1);
}
for(i=1; i<argc; i++) {
if( strcmp("-ypset", argv[i]) == 0)
ypsetmode = YPSET_ALL;
else if (strcmp("-ypsetme", argv[i]) == 0)
ypsetmode = YPSET_LOCAL;
}
/* blow away everything in BINDINGDIR */
#ifdef DAEMON
switch(fork()) {
case 0:
break;
case -1:
perror("fork");
exit(1);
default:
exit(0);
}
setsid();
#endif
pmap_unset(YPBINDPROG, YPBINDVERS);
transp = svcudp_create(RPC_ANYSOCK);
if (transp == NULL) {
fprintf(stderr, "cannot create udp service.");
exit(1);
}
if (!svc_register(transp, YPBINDPROG, YPBINDVERS, ypbindprog_2, IPPROTO_UDP)) {
fprintf(stderr, "unable to register (YPBINDPROG, YPBINDVERS, udp).");
exit(1);
}
transp = svctcp_create(RPC_ANYSOCK, 0, 0);
if (transp == NULL) {
fprintf(stderr, "cannot create tcp service.");
exit(1);
}
if (!svc_register(transp, YPBINDPROG, YPBINDVERS, ypbindprog_2, IPPROTO_TCP)) {
fprintf(stderr, "unable to register (YPBINDPROG, YPBINDVERS, tcp).");
exit(1);
}
if( (rpcsock=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
perror("socket");
return -1;
}
fcntl(rpcsock, F_SETFL, fcntl(rpcsock, F_GETFL, 0) | FNDELAY);
i = 1;
setsockopt(rpcsock, SOL_SOCKET, SO_BROADCAST, &i, sizeof(i));
rmtca.prog = YPPROG;
rmtca.vers = YPVERS;
rmtca.proc = YPPROC_DOMAIN_NONACK;
rmtca.xdr_args = NULL; /* set at call time */
rmtca.args_ptr = NULL; /* set at call time */
rmtcr.port_ptr = &rmtcr_port;
rmtcr.xdr_results = xdr_bool;
rmtcr.results_ptr = (caddr_t)&rmtcr_outval;
/* build initial domain binding, make it "unsuccessful" */
ypbindlist = (struct _dom_binding *)malloc(sizeof *ypbindlist);
bzero((char *)ypbindlist, sizeof *ypbindlist);
strncpy(ypbindlist->dom_domain, domainname, sizeof ypbindlist->dom_domain);
ypbindlist->dom_vers = YPVERS;
ypbindlist->dom_alive = 0;
ypbindlist->dom_lockfd = -1;
sprintf(path, "%s/%s.%d", BINDINGDIR, ypbindlist->dom_domain,
ypbindlist->dom_vers);
(void)unlink(path);
width = getdtablesize();
while(1) {
fdsr = svc_fdset;
FD_SET(rpcsock, &fdsr);
tv.tv_sec = 1;
tv.tv_usec = 0;
switch(select(width, &fdsr, NULL, NULL, &tv)) {
case 0:
checkwork();
break;
case -1:
perror("select\n");
break;
default:
if(FD_ISSET(rpcsock, &fdsr)) {
FD_CLR(rpcsock, &fdsr);
handle_replies();
}
svc_getreqset(&fdsr);
if(check)
checkwork();
break;
}
}
}
/*
* change to do something like this:
*
* STATE TIME ACTION NEWTIME NEWSTATE
* no binding t==* broadcast t=2 no binding
* binding t==60 check server t=10 binding
* binding t=10 broadcast t=2 no binding
*/
checkwork()
{
struct _dom_binding *ypdb;
time_t t;
check = 0;
time(&t);
for(ypdb=ypbindlist; ypdb; ypdb=ypdb->dom_pnext) {
if(ypdb->dom_alive==0 || ypdb->dom_check_t < t) {
broadcast(ypdb->dom_domain);
time(&t);
ypdb->dom_check_t = t + 5;
}
}
}
broadcast(dom)
char *dom;
{
struct rpc_msg rpcmsg;
char buf[1400], inbuf[8192];
enum clnt_stat st;
struct timeval tv;
int outlen, i, sock, len;
struct sockaddr_in bsin;
struct ifconf ifc;
struct ifreq ifreq, *ifr;
struct in_addr in;
AUTH *rpcua;
XDR rpcxdr;
rmtca.xdr_args = xdr_domainname;
rmtca.args_ptr = dom;
bzero((char *)&bsin, sizeof bsin);
bsin.sin_family = AF_INET;
bsin.sin_port = htons(PMAPPORT);
bzero((char *)&rpcxdr, sizeof rpcxdr);
bzero((char *)&rpcmsg, sizeof rpcmsg);
rpcua = authunix_create_default();
if( rpcua == (AUTH *)NULL) {
/*printf("cannot get unix auth\n");*/
return RPC_SYSTEMERROR;
}
rpcmsg.rm_direction = CALL;
rpcmsg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
rpcmsg.rm_call.cb_prog = PMAPPROG;
rpcmsg.rm_call.cb_vers = PMAPVERS;
rpcmsg.rm_call.cb_proc = PMAPPROC_CALLIT;
rpcmsg.rm_call.cb_cred = rpcua->ah_cred;
rpcmsg.rm_call.cb_verf = rpcua->ah_verf;
gettimeofday(&tv, (struct timezone *)0);
rpcmsg.rm_xid = (int)dom;
tv.tv_usec = 0;
xdrmem_create(&rpcxdr, buf, sizeof buf, XDR_ENCODE);
if( (!xdr_callmsg(&rpcxdr, &rpcmsg)) ) {
st = RPC_CANTENCODEARGS;
AUTH_DESTROY(rpcua);
return st;
}
if( (!xdr_rmtcall_args(&rpcxdr, &rmtca)) ) {
st = RPC_CANTENCODEARGS;
AUTH_DESTROY(rpcua);
return st;
}
outlen = (int)xdr_getpos(&rpcxdr);
xdr_destroy(&rpcxdr);
if(outlen<1) {
AUTH_DESTROY(rpcua);
return st;
}
AUTH_DESTROY(rpcua);
/* find all networks and send the RPC packet out them all */
if( (sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
perror("socket");
return -1;
}
ifc.ifc_len = sizeof inbuf;
ifc.ifc_buf = inbuf;
if( ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
close(sock);
perror("ioctl(SIOCGIFCONF)");
return -1;
}
ifr = ifc.ifc_req;
ifreq.ifr_name[0] = '\0';
for(i=0; i<ifc.ifc_len; i+=len, ifr=(struct ifreq *)((caddr_t)ifr+len)) {
#if defined(BSD) && BSD >= 199103
len = sizeof ifr->ifr_name + ifr->ifr_addr.sa_len;
#else
len = sizeof ifc.ifc_len / sizeof(struct ifreq);
#endif
ifreq = *ifr;
if( ifreq.ifr_addr.sa_family != AF_INET)
continue;
if( ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0) {
perror("ioctl(SIOCGIFFLAGS)");
continue;
}
if( (ifreq.ifr_flags & IFF_UP) == 0)
continue;
ifreq.ifr_flags &= (IFF_LOOPBACK | IFF_BROADCAST);
if( ifreq.ifr_flags==IFF_BROADCAST ) {
if( ioctl(sock, SIOCGIFBRDADDR, &ifreq) < 0 ) {
perror("ioctl(SIOCGIFBRDADDR)");
continue;
}
} else if( ifreq.ifr_flags==IFF_LOOPBACK ) {
if( ioctl(sock, SIOCGIFADDR, &ifreq) < 0 ) {
perror("ioctl(SIOCGIFADDR)");
continue;
}
} else
continue;
in = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr;
bsin.sin_addr = in;
if( sendto(rpcsock, buf, outlen, 0, (struct sockaddr *)&bsin,
sizeof bsin) < 0 )
perror("sendto");
}
close(sock);
return 0;
}
/*enum clnt_stat*/
handle_replies()
{
char buf[1400];
int fromlen, inlen;
struct sockaddr_in raddr;
struct rpc_msg msg;
XDR xdr;
recv_again:
bzero((char *)&xdr, sizeof(xdr));
bzero((char *)&msg, sizeof(msg));
msg.acpted_rply.ar_verf = _null_auth;
msg.acpted_rply.ar_results.where = (caddr_t)&rmtcr;
msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
try_again:
fromlen = sizeof (struct sockaddr);
inlen = recvfrom(rpcsock, buf, sizeof buf, 0,
(struct sockaddr *)&raddr, &fromlen);
if(inlen<0) {
if(errno==EINTR)
goto try_again;
return RPC_CANTRECV;
}
if(inlen<sizeof(u_long))
goto recv_again;
/*
* see if reply transaction id matches sent id.
* If so, decode the results.
*/
xdrmem_create(&xdr, buf, (u_int)inlen, XDR_DECODE);
if( xdr_replymsg(&xdr, &msg)) {
if( (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
(msg.acpted_rply.ar_stat == SUCCESS)) {
raddr.sin_port = htons((u_short)rmtcr_port);
rpc_received(msg.rm_xid, &raddr, 0);
}
}
xdr.x_op = XDR_FREE;
msg.acpted_rply.ar_results.proc = xdr_void;
xdr_destroy(&xdr);
return RPC_SUCCESS;
}
/*
* LOOPBACK IS MORE IMPORTANT: PUT IN HACK
*/
rpc_received(dom, raddrp, force)
char *dom;
struct sockaddr_in *raddrp;
int force;
{
struct _dom_binding *ypdb;
char path[MAXPATHLEN];
int fd;
/*printf("returned from %s about %s\n", inet_ntoa(raddrp->sin_addr), dom);*/
if(dom==NULL)
return;
for(ypdb=ypbindlist; ypdb; ypdb=ypdb->dom_pnext)
if( strcmp(ypdb->dom_domain, dom) == 0)
break;
if(ypdb==NULL) {
if(force==0)
return;
ypdb = (struct _dom_binding *)malloc(sizeof *ypdb);
bzero((char *)ypdb, sizeof *ypdb);
strncpy(ypdb->dom_domain, dom, sizeof ypdb->dom_domain);
ypdb->dom_lockfd = -1;
ypdb->dom_pnext = ypbindlist;
ypbindlist = ypdb;
}
/* soft update, alive, less than 30 seconds old */
if(ypdb->dom_alive==1 && force==0 && ypdb->dom_check_t<time(NULL)+30)
return;
bcopy((char *)raddrp, (char *)&ypdb->dom_server_addr,
sizeof ypdb->dom_server_addr);
ypdb->dom_check_t = time(NULL) + 60; /* recheck binding in 60 seconds */
ypdb->dom_vers = YPVERS;
ypdb->dom_alive = 1;
if(ypdb->dom_lockfd != -1)
close(ypdb->dom_lockfd);
sprintf(path, "%s/%s.%d", BINDINGDIR,
ypdb->dom_domain, ypdb->dom_vers);
#ifdef O_SHLOCK
if( (fd=open(path, O_CREAT|O_SHLOCK|O_RDWR|O_TRUNC, 0644)) == -1) {
(void)mkdir(BINDINGDIR, 0755);
if( (fd=open(path, O_CREAT|O_SHLOCK|O_RDWR|O_TRUNC, 0644)) == -1)
return;
}
#else
if( (fd=open(path, O_CREAT|O_RDWR|O_TRUNC, 0644)) == -1) {
(void)mkdir(BINDINGDIR, 0755);
if( (fd=open(path, O_CREAT|O_RDWR|O_TRUNC, 0644)) == -1)
return;
}
flock(fd, LOCK_SH);
/*
* ok, if BINDINGDIR exists, and we can create the binding file,
* then write to it..
*/
ypdb->dom_lockfd = fd;
if( write(ypdb->dom_lockfd, raddrp, sizeof *raddrp) != sizeof *raddrp) {
perror("write");
close(ypdb->dom_lockfd);
ypdb->dom_lockfd = -1;
return;
}
#endif
}
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