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Annotation of 43BSDReno/lib/librpc/svc_udp.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
        !             3:  * unrestricted use provided that this legend is included on all tape
        !             4:  * media and as a part of the software program in whole or part.  Users
        !             5:  * may copy or modify Sun RPC without charge, but are not authorized
        !             6:  * to license or distribute it to anyone else except as part of a product or
        !             7:  * program developed by the user.
        !             8:  * 
        !             9:  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
        !            10:  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
        !            11:  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
        !            12:  * 
        !            13:  * Sun RPC is provided with no support and without any obligation on the
        !            14:  * part of Sun Microsystems, Inc. to assist in its use, correction,
        !            15:  * modification or enhancement.
        !            16:  * 
        !            17:  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
        !            18:  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
        !            19:  * OR ANY PART THEREOF.
        !            20:  * 
        !            21:  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
        !            22:  * or profits or other special, indirect and consequential damages, even if
        !            23:  * Sun has been advised of the possibility of such damages.
        !            24:  * 
        !            25:  * Sun Microsystems, Inc.
        !            26:  * 2550 Garcia Avenue
        !            27:  * Mountain View, California  94043
        !            28:  */
        !            29: #ifndef lint
        !            30: static char sccsid[] = "@(#)svc_udp.c 1.4 85/03/14 Copyr 1984 Sun Micro";
        !            31: #endif
        !            32: 
        !            33: /*
        !            34:  * svc_udp.c,
        !            35:  * Server side for UDP/IP based RPC.  (Does some caching in the hopes of
        !            36:  * achieving execute-at-most-once semantics.)
        !            37:  *
        !            38:  * Copyright (C) 1984, Sun Microsystems, Inc.
        !            39:  */
        !            40: 
        !            41: #include <stdio.h>
        !            42: #include "types.h"
        !            43: #include <netinet/in.h>
        !            44: #include <sys/socket.h>
        !            45: #include <errno.h>
        !            46: #include "xdr.h"
        !            47: #include "auth.h"
        !            48: #include "clnt.h"
        !            49: #include "rpc_msg.h"
        !            50: #include "svc.h"
        !            51: 
        !            52: char *mem_alloc();
        !            53: 
        !            54: #define rpc_buffer(xprt) ((xprt)->xp_p1)
        !            55: 
        !            56: static bool_t          svcudp_recv();
        !            57: static bool_t          svcudp_reply();
        !            58: static enum xprt_stat  svcudp_stat();
        !            59: static bool_t          svcudp_getargs();
        !            60: static bool_t          svcudp_freeargs();
        !            61: static void            svcudp_destroy();
        !            62: 
        !            63: static struct xp_ops svcudp_op = {
        !            64:        svcudp_recv,
        !            65:        svcudp_stat,
        !            66:        svcudp_getargs,
        !            67:        svcudp_reply,
        !            68:        svcudp_freeargs,
        !            69:        svcudp_destroy
        !            70: };
        !            71: 
        !            72: extern int errno;
        !            73: 
        !            74: /*
        !            75:  * kept in xprt->xp_p2
        !            76:  */
        !            77: struct svcudp_data {
        !            78:        u_long  su_xid;         /* transaction id */
        !            79:        XDR     su_xdrs;        /* XDR handle */
        !            80:        char    su_verfbody[MAX_AUTH_BYTES];    /* verifier body */
        !            81: };
        !            82: #define        su_data(xprt)   ((struct svcudp_data *)(xprt->xp_p2))
        !            83: 
        !            84: /*
        !            85:  * Usage:
        !            86:  *     xprt = svcudp_create(sock);
        !            87:  *
        !            88:  * If sock<0 then a socket is created, else sock is used.
        !            89:  * If the socket, sock is not bound to a port then svcudp_create
        !            90:  * binds it to an arbitrary port.  In any (successful) case,
        !            91:  * xprt->xp_sock is the registered socket number and xprt->xp_port is the
        !            92:  * associated port number.
        !            93:  * Once *xprt is initialized, it is registered as a transporter;
        !            94:  * see (svc.h, xprt_register).
        !            95:  * The routines returns NULL if a problem occurred.
        !            96:  */
        !            97: SVCXPRT *
        !            98: svcudp_create(sock)
        !            99:        register int sock;
        !           100: {
        !           101:        bool_t madesock = FALSE;
        !           102:        register SVCXPRT *xprt;
        !           103:        register struct svcudp_data *su;
        !           104:        struct sockaddr_in addr;
        !           105:        int len = sizeof(struct sockaddr_in);
        !           106: 
        !           107:        if (sock == RPC_ANYSOCK) {
        !           108:                if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
        !           109:                        perror("svcudp_create: socket creation problem");
        !           110:                        return ((SVCXPRT *)NULL);
        !           111:                }
        !           112:                madesock = TRUE;
        !           113:        }
        !           114:        addr.sin_addr.s_addr = 0;
        !           115:        addr.sin_family = AF_INET;
        !           116:        addr.sin_port = 0;
        !           117:        (void)bind(sock, (struct sockaddr *)&addr, len);
        !           118:        if (getsockname(sock, (caddr_t)&addr, &len) != 0) {
        !           119:                perror("svcudp_create - cannot getsockname");
        !           120:                if (madesock)
        !           121:                        (void)close(sock);
        !           122:                return ((SVCXPRT *)NULL);
        !           123:        }
        !           124:        xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
        !           125:        if (xprt == NULL) {
        !           126:                fprintf(stderr, "svcudp_create: out of memory\n");
        !           127:                return (NULL);
        !           128:        }
        !           129:        if ((rpc_buffer(xprt) = mem_alloc(UDPMSGSIZE)) == NULL) {
        !           130:                fprintf(stderr, "svcudp_create: out of memory\n");
        !           131:                return (NULL);
        !           132:        }
        !           133:        su = (struct svcudp_data *)mem_alloc(sizeof(*su));
        !           134:        if (su == NULL) {
        !           135:                fprintf(stderr, "svcudp_create: out of memory\n");
        !           136:                return (NULL);
        !           137:        }
        !           138:        xdrmem_create(
        !           139:            &(su->su_xdrs), rpc_buffer(xprt), UDPMSGSIZE, XDR_DECODE);
        !           140:        xprt->xp_p2 = (caddr_t)su;
        !           141:        xprt->xp_verf.oa_base = su->su_verfbody;
        !           142:        xprt->xp_ops = &svcudp_op;
        !           143:        xprt->xp_port = ntohs(addr.sin_port);
        !           144:        xprt->xp_sock = sock;
        !           145:        xprt_register(xprt);
        !           146:        return (xprt);
        !           147: }
        !           148:  
        !           149: static enum xprt_stat
        !           150: svcudp_stat(xprt)
        !           151:        SVCXPRT *xprt;
        !           152: {
        !           153: 
        !           154:        return (XPRT_IDLE); 
        !           155: }
        !           156: 
        !           157: static bool_t
        !           158: svcudp_recv(xprt, msg)
        !           159:        register SVCXPRT *xprt;
        !           160:        struct rpc_msg *msg;
        !           161: {
        !           162:        register struct svcudp_data *su = su_data(xprt);
        !           163:        register XDR *xdrs = &(su->su_xdrs);
        !           164:        register int rlen;
        !           165: 
        !           166:     again:
        !           167:        xprt->xp_addrlen = sizeof(struct sockaddr_in);
        !           168:        rlen = recvfrom(xprt->xp_sock, rpc_buffer(xprt), UDPMSGSIZE,
        !           169:            0, (struct sockaddr *)&(xprt->xp_raddr), &(xprt->xp_addrlen));
        !           170:        if (rlen == -1 && errno == EINTR)
        !           171:                goto again;
        !           172:        if (rlen < 4*sizeof(u_long))
        !           173:                return (FALSE);
        !           174:        xdrs->x_op = XDR_DECODE;
        !           175:        XDR_SETPOS(xdrs, 0);
        !           176:        if (! xdr_callmsg(xdrs, msg))
        !           177:                return (FALSE);
        !           178:        su->su_xid = msg->rm_xid;
        !           179:        return (TRUE);
        !           180: }
        !           181: 
        !           182: static bool_t
        !           183: svcudp_reply(xprt, msg)
        !           184:        register SVCXPRT *xprt; 
        !           185:        struct rpc_msg *msg; 
        !           186: {
        !           187:        register struct svcudp_data *su = su_data(xprt);
        !           188:        register XDR *xdrs = &(su->su_xdrs);
        !           189:        register int slen;
        !           190:        register bool_t stat = FALSE;
        !           191: 
        !           192:        xdrs->x_op = XDR_ENCODE;
        !           193:        XDR_SETPOS(xdrs, 0);
        !           194:        msg->rm_xid = su->su_xid;
        !           195:        if (xdr_replymsg(xdrs, msg)) {
        !           196:                slen = (int)XDR_GETPOS(xdrs);
        !           197:                if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0,
        !           198:                    (struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen)
        !           199:                    == slen)
        !           200:                        stat = TRUE;
        !           201:        }
        !           202:        return (stat);
        !           203: }
        !           204: 
        !           205: static bool_t
        !           206: svcudp_getargs(xprt, xdr_args, args_ptr)
        !           207:        SVCXPRT *xprt;
        !           208:        xdrproc_t xdr_args;
        !           209:        caddr_t args_ptr;
        !           210: {
        !           211: 
        !           212:        return ((*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr));
        !           213: }
        !           214: 
        !           215: static bool_t
        !           216: svcudp_freeargs(xprt, xdr_args, args_ptr)
        !           217:        SVCXPRT *xprt;
        !           218:        xdrproc_t xdr_args;
        !           219:        caddr_t args_ptr;
        !           220: {
        !           221:        register XDR *xdrs = &(su_data(xprt)->su_xdrs);
        !           222: 
        !           223:        xdrs->x_op = XDR_FREE;
        !           224:        return ((*xdr_args)(xdrs, args_ptr));
        !           225: }
        !           226: 
        !           227: static void
        !           228: svcudp_destroy(xprt)
        !           229:        register SVCXPRT *xprt;
        !           230: {
        !           231:        register struct svcudp_data *su = su_data(xprt);
        !           232: 
        !           233:        xprt_unregister(xprt);
        !           234:        (void)close(xprt->xp_sock);
        !           235:        XDR_DESTROY(&(su->su_xdrs));
        !           236:        mem_free((caddr_t)su, sizeof(struct svcudp_data));
        !           237:        mem_free(rpc_buffer(xprt), UDPMSGSIZE);
        !           238:        mem_free((caddr_t)xprt, sizeof(SVCXPRT));
        !           239: }

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