clnt_bcast.c File Reference

#include <wintirpc.h>
#include <sys/types.h>
#include <rpc/rpc.h>
#include <rpc/nettype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "rpc_com.h"

Include dependency graph for clnt_bcast.c:

Go to the source code of this file.

Classes
struct	broadif

Macros
#define	MAXBCAST   20 /* Max no of broadcasting transports */
#define	INITTIME   4000 /* Time to wait initially */
#define	WAITTIME   8000 /* Maximum time to wait */
#define	POLLRDNORM   0x040 /* Normal data may be read. */
#define	POLLRDBAND   0x080 /* Priority data may be read. */
#define	TAILQ_NEXT(elm, field)   ((elm)->field.tqe_next)
#define	TAILQ_FIRST(head)   ((head)->tqh_first)

Functions
typedef	TAILQ_HEAD (broadif)
void	__rpc_freebroadifs (broadlist_t *list)
int	__rpc_broadenable (int af, int s, struct broadif *bip)
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	rpc_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, const char *nettype)

Macro Definition Documentation

INITTIME

#define INITTIME   4000 /* Time to wait initially */

Definition at line 76 of file clnt_bcast.c.

MAXBCAST

#define MAXBCAST   20 /* Max no of broadcasting transports */

Definition at line 75 of file clnt_bcast.c.

POLLRDBAND

#define POLLRDBAND   0x080 /* Priority data may be read. */

Definition at line 83 of file clnt_bcast.c.

POLLRDNORM

#define POLLRDNORM   0x040 /* Normal data may be read. */

Definition at line 80 of file clnt_bcast.c.

TAILQ_FIRST

#define TAILQ_FIRST

(

head

)

((head)->tqh_first)

Definition at line 136 of file clnt_bcast.c.

TAILQ_NEXT

#define TAILQ_NEXT	(		elm,
			field
	)		((elm)->field.tqe_next)

Definition at line 134 of file clnt_bcast.c.

WAITTIME

#define WAITTIME   8000 /* Maximum time to wait */

Definition at line 77 of file clnt_bcast.c.

Function Documentation

__rpc_broadenable()

int __rpc_broadenable	(	int	af,
		int	s,
		struct broadif *	bip
	)

Definition at line 244 of file clnt_bcast.c.

{
    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) == SOCKET_ERROR)
            return -1;

    return 0;
}

Referenced by rpc_broadcast_exp().

__rpc_freebroadifs()

void __rpc_freebroadifs

(

broadlist_t *

list

)

Definition at line 229 of file clnt_bcast.c.

{
    struct broadif *bip, *next;

    bip = TAILQ_FIRST(list);

    while (bip != NULL) {
        next = TAILQ_NEXT(bip, link);
        free(bip);
        bip = next;
    }
}

Referenced by rpc_broadcast_exp().

rpc_broadcast()

enum clnt_stat rpc_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,
		const char *	nettype
	)

Definition at line 687 of file clnt_bcast.c.

{
    enum clnt_stat  dummy;

    dummy = rpc_broadcast_exp(prog, vers, proc, xargs, argsp,
        xresults, resultsp, eachresult,
        INITTIME, WAITTIME, nettype);
    return (dummy);
}

rpc_broadcast_exp()

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
	)

Definition at line 264 of file clnt_bcast.c.

{
    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();
    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) {
        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 == INVALID_SOCKET) {
            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) {
                closesocket(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 *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);
                        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:
    if (inbuf)
        (void) free(inbuf);
    if (outbuf)
        (void) free(outbuf);
#ifdef PORTMAP
    if (outbuf_pmap)
        (void) free(outbuf_pmap);
#endif              /* PORTMAP */
    for (i = 0; i < fdlistno; i++) {
        (void)closesocket(fdlist[i].fd);
        __rpc_freebroadifs(&fdlist[i].nal);
    }
    AUTH_DESTROY(sys_auth);
    (void) __rpc_endconf(handle);

    return (stat);
}

Referenced by rpc_broadcast().

TAILQ_HEAD()

typedef TAILQ_HEAD

(

broadif

)

Definition at line 145 of file clnt_bcast.c.

{
    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 0   /* WINDOWS */
    if (getifaddrs(&ifp) < 0)
        return 0;
#else
    /* Use GetAdaptersAddresses() ? */
#endif

    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 *)malloc(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
        {
            free(bip);
            continue;
        }
        TAILQ_INSERT_TAIL(list, bip, link);
        count++;
    }
    freeifaddrs(ifp);
    freeaddrinfo(res);

    return count;
}