/*
* Request a port number from the port mapper.
* Returns the port in host order.
*/
int
rpc_getport(struct iodesc *d, n_long prog, n_long vers)
{
struct args {
n_long prog; /* call program */
n_long vers; /* call version */
n_long proto; /* call protocol */
n_long port; /* call port (unused) */
} *args;
struct res {
n_long port;
} *res;
struct {
n_long h[RPC_HEADER_WORDS];
struct args d;
} sdata;
struct {
n_long h[RPC_HEADER_WORDS];
struct res d;
n_long pad;
} rdata;
ssize_t cc;
int port;
#ifdef RPC_DEBUG
if (debug)
printf("getport: prog=0x%x vers=%d\n", prog, vers);
#endif
/* This one is fixed forever. */
if (prog == PMAPPROG)
return (PMAPPORT);
/* Try for cached answer first */
port = rpc_pmap_getcache(d->destip, prog, vers);
if (port != -1)
return (port);
args = &sdata.d;
args->prog = htonl(prog);
args->vers = htonl(vers);
args->proto = htonl(IPPROTO_UDP);
args->port = 0;
res = &rdata.d;
cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
args, sizeof(*args), res, sizeof(*res));
if (cc < 0 || (size_t)cc < sizeof(*res)) {
printf("getport: %s", strerror(errno));
errno = EBADRPC;
return (-1);
}
port = (int)ntohl(res->port);
rpc_pmap_putcache(d->destip, prog, vers, port);
return (port);
}
/*
* RPC: bootparam/whoami
* Given client IP address, get:
* client name (hostname)
* domain name (domainname)
* gateway address
*
* The hostname and domainname are set here for convenience.
*
* Note - bpsin is initialized to the broadcast address,
* and will be replaced with the bootparam server address
* after this call is complete. Have to use PMAP_PROC_CALL
* to make sure we get responses only from a servers that
* know about us (don't want to broadcast a getport call).
*/
int
bp_whoami(int sockfd)
{
/* RPC structures for PMAPPROC_CALLIT */
struct args {
u_int32_t prog;
u_int32_t vers;
u_int32_t proc;
u_int32_t arglen;
struct xdr_inaddr xina;
} *args;
struct repl {
u_int16_t _pad;
u_int16_t port;
u_int32_t encap_len;
/* encapsulated data here */
n_long capsule[64];
} *repl;
struct {
n_long h[RPC_HEADER_WORDS];
struct args d;
} sdata;
struct {
n_long h[RPC_HEADER_WORDS];
struct repl d;
} rdata;
char *send_tail, *recv_head;
struct iodesc *d;
int len, x;
RPC_PRINTF(("bp_whoami: myip=%s\n", inet_ntoa(myip)));
if (!(d = socktodesc(sockfd))) {
RPC_PRINTF(("bp_whoami: bad socket. %d\n", sockfd));
return (-1);
}
args = &sdata.d;
repl = &rdata.d;
/*
* Build request args for PMAPPROC_CALLIT.
*/
args->prog = htonl(BOOTPARAM_PROG);
args->vers = htonl(BOOTPARAM_VERS);
args->proc = htonl(BOOTPARAM_WHOAMI);
args->arglen = htonl(sizeof(struct xdr_inaddr));
send_tail = (char *)&args->xina;
/*
* append encapsulated data (client IP address)
*/
if (xdr_inaddr_encode(&send_tail, myip))
return (-1);
/* RPC: portmap/callit */
d->myport = htons(--rpc_port);
d->destip.s_addr = INADDR_BROADCAST; /* XXX: subnet bcast? */
/* rpc_call will set d->destport */
len = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_CALLIT,
args, send_tail - (char *)args,
repl, sizeof(*repl));
if (len < 8) {
printf("bootparamd: 'whoami' call failed\n");
return (-1);
}
/* Save bootparam server address (from IP header). */
rpc_fromaddr(repl, &bp_server_addr, &bp_server_port);
/*
* Note that bp_server_port is now 111 due to the
* indirect call (using PMAPPROC_CALLIT), so get the
* actual port number from the reply data.
*/
bp_server_port = repl->port;
RPC_PRINTF(("bp_whoami: server at %s:%d\n",
inet_ntoa(bp_server_addr), ntohs(bp_server_port)));
/* We have just done a portmap call, so cache the portnum. */
rpc_pmap_putcache(bp_server_addr, BOOTPARAM_PROG, BOOTPARAM_VERS,
(int)ntohs(bp_server_port));
/*
* Parse the encapsulated results from bootparam/whoami
*/
x = ntohl(repl->encap_len);
if (len < x) {
printf("bp_whoami: short reply, %d < %d\n", len, x);
return (-1);
}
recv_head = (char *)repl->capsule;
/* client name */
hostnamelen = MAXHOSTNAMELEN-1;
if (xdr_string_decode(&recv_head, hostname, &hostnamelen)) {
RPC_PRINTF(("bp_whoami: bad hostname\n"));
return (-1);
}
/* domain name */
domainnamelen = MAXHOSTNAMELEN-1;
if (xdr_string_decode(&recv_head, domainname, &domainnamelen)) {
RPC_PRINTF(("bp_whoami: bad domainname\n"));
return (-1);
}
/* gateway address */
if (xdr_inaddr_decode(&recv_head, &gateip)) {
RPC_PRINTF(("bp_whoami: bad gateway\n"));
return (-1);
}
/* success */
return(0);
}
