X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=support%2Frpc%2Fsvc_tcp.c;fp=support%2Frpc%2Fsvc_tcp.c;h=6e6f785129d260455a5d216b0d817ab816442af6;hp=0000000000000000000000000000000000000000;hb=f1bfe0916c04d93de7a4fae5315fff6e4ccac23f;hpb=981d25a37fe4a71eddd162672a658da223453985 diff --git a/support/rpc/svc_tcp.c b/support/rpc/svc_tcp.c new file mode 100644 index 0000000..6e6f785 --- /dev/null +++ b/support/rpc/svc_tcp.c @@ -0,0 +1,528 @@ +/* + * Sun RPC is a product of Sun Microsystems, Inc. and is provided for + * unrestricted use provided that this legend is included on all tape + * media and as a part of the software program in whole or part. Users + * may copy or modify Sun RPC without charge, but are not authorized + * to license or distribute it to anyone else except as part of a product or + * program developed by the user. + * + * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE + * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR + * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. + * + * Sun RPC is provided with no support and without any obligation on the + * part of Sun Microsystems, Inc. to assist in its use, correction, + * modification or enhancement. + * + * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE + * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC + * OR ANY PART THEREOF. + * + * In no event will Sun Microsystems, Inc. be liable for any lost revenue + * or profits or other special, indirect and consequential damages, even if + * Sun has been advised of the possibility of such damages. + * + * Sun Microsystems, Inc. + * 2550 Garcia Avenue + * Mountain View, California 94043 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char *rcsid = "$OpenBSD: svc_tcp.c,v 1.18 1998/05/22 04:23:01 deraadt Exp $"; +#endif /* LIBC_SCCS and not lint */ + +/* + * svc_tcp.c, Server side for TCP/IP based RPC. + * + * Copyright (C) 1984, Sun Microsystems, Inc. + * + * Actually implements two flavors of transporter - + * a tcp rendezvouser (a listner and connection establisher) + * and a record/tcp stream. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#ifndef __linux__ +#include +#endif + +/* + * Ops vector for TCP/IP based rpc service handle + */ +static bool_t svctcp_recv(); +static enum xprt_stat svctcp_stat(); +static bool_t svctcp_getargs(); +static bool_t svctcp_reply(); +static bool_t svctcp_freeargs(); +static void svctcp_destroy(); + +static struct xp_ops svctcp_op = { + svctcp_recv, + svctcp_stat, + svctcp_getargs, + svctcp_reply, + svctcp_freeargs, + svctcp_destroy +}; + +/* + * Ops vector for TCP/IP rendezvous handler + */ +static bool_t rendezvous_request(); +static enum xprt_stat rendezvous_stat(); + +static struct xp_ops svctcp_rendezvous_op = { + rendezvous_request, + rendezvous_stat, + (bool_t (*)())abort, + (bool_t (*)())abort, + (bool_t (*)())abort, + svctcp_destroy +}; + +static int readtcp(), writetcp(); +static SVCXPRT *makefd_xprt(); + +struct tcp_rendezvous { /* kept in xprt->xp_p1 */ + u_int sendsize; + u_int recvsize; +}; + +struct tcp_conn { /* kept in xprt->xp_p1 */ + enum xprt_stat strm_stat; + u_long x_id; + XDR xdrs; + char verf_body[MAX_AUTH_BYTES]; +}; + +/* + * Usage: + * xprt = svctcp_create(sock, send_buf_size, recv_buf_size); + * + * Creates, registers, and returns a (rpc) tcp based transporter. + * Once *xprt is initialized, it is registered as a transporter + * see (svc.h, xprt_register). This routine returns + * a NULL if a problem occurred. + * + * If sock<0 then a socket is created, else sock is used. + * If the socket, sock is not bound to a port then svctcp_create + * binds it to an arbitrary port. The routine then starts a tcp + * listener on the socket's associated port. In any (successful) case, + * xprt->xp_sock is the registered socket number and xprt->xp_port is the + * associated port number. + * + * Since tcp streams do buffered io similar to stdio, the caller can specify + * how big the send and receive buffers are via the second and third parms; + * 0 => use the system default. + */ +SVCXPRT * +svctcp_create(sock, sendsize, recvsize) + register int sock; + u_int sendsize; + u_int recvsize; +{ + bool_t madesock = FALSE; + register SVCXPRT *xprt; + register struct tcp_rendezvous *r; + struct sockaddr_in addr; + int len = sizeof(struct sockaddr_in); + + if (sock == RPC_ANYSOCK) { + if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { + perror("svctcp_.c - udp socket creation problem"); + return ((SVCXPRT *)NULL); + } + madesock = TRUE; + } + memset(&addr, 0, sizeof (addr)); +#ifndef __linux__ + addr.sin_len = sizeof(struct sockaddr_in); +#endif + addr.sin_family = AF_INET; + if (bindresvport(sock, &addr)) { + addr.sin_port = 0; + (void)bind(sock, (struct sockaddr *)&addr, len); + } + if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) || + (listen(sock, 2) != 0)) { + perror("svctcp_.c - cannot getsockname or listen"); + if (madesock) + (void)close(sock); + return ((SVCXPRT *)NULL); + } + r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r)); + if (r == NULL) { + (void)fprintf(stderr, "svctcp_create: out of memory\n"); + if (madesock) + (void)close(sock); + return (NULL); + } + r->sendsize = sendsize; + r->recvsize = recvsize; + xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); + if (xprt == NULL) { + (void)fprintf(stderr, "svctcp_create: out of memory\n"); + if (madesock) + (void)close(sock); + free(r); + return (NULL); + } + xprt->xp_p2 = NULL; + xprt->xp_p1 = (caddr_t)r; + xprt->xp_auth = NULL; + xprt->xp_verf = _null_auth; + xprt->xp_ops = &svctcp_rendezvous_op; + xprt->xp_port = ntohs(addr.sin_port); + xprt->xp_sock = sock; + xprt_register(xprt); + return (xprt); +} + +/* + * Like svtcp_create(), except the routine takes any *open* UNIX file + * descriptor as its first input. + */ +SVCXPRT * +svcfd_create(fd, sendsize, recvsize) + int fd; + u_int sendsize; + u_int recvsize; +{ + + return (makefd_xprt(fd, sendsize, recvsize)); +} + +static SVCXPRT * +makefd_xprt(fd, sendsize, recvsize) + int fd; + u_int sendsize; + u_int recvsize; +{ + register SVCXPRT *xprt; + register struct tcp_conn *cd; + + xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); + if (xprt == (SVCXPRT *)NULL) { + (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n"); + goto done; + } + cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn)); + if (cd == (struct tcp_conn *)NULL) { + (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n"); + mem_free((char *) xprt, sizeof(SVCXPRT)); + xprt = (SVCXPRT *)NULL; + goto done; + } + cd->strm_stat = XPRT_IDLE; + xdrrec_create(&(cd->xdrs), sendsize, recvsize, + (caddr_t)xprt, readtcp, writetcp); + xprt->xp_p2 = NULL; + xprt->xp_p1 = (caddr_t)cd; + xprt->xp_auth = NULL; + xprt->xp_verf.oa_base = cd->verf_body; + xprt->xp_addrlen = 0; + xprt->xp_ops = &svctcp_op; /* truely deals with calls */ + xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ + xprt->xp_sock = fd; + xprt_register(xprt); + done: + return (xprt); +} + +static bool_t +rendezvous_request(xprt) + register SVCXPRT *xprt; +{ + int sock; + struct tcp_rendezvous *r; + struct sockaddr_in addr; + int len; + + r = (struct tcp_rendezvous *)xprt->xp_p1; + again: + len = sizeof(struct sockaddr_in); + if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr, + &len)) < 0) { + if (errno == EINTR) + goto again; + return (FALSE); + } + +#ifdef IP_OPTIONS + { +#ifdef __linux__ +#define ipopt_list ip_opts + struct ip_opts opts; +#else + struct ipoption opts; +#endif + int optsize = sizeof(opts), i; + + if (!getsockopt(sock, IPPROTO_IP, IP_OPTIONS, (char *)&opts, + &optsize) && optsize != 0) { + for (i = 0; (char *)&opts.ipopt_list[i] - (char *)&opts < + optsize; ) { + u_char c = (u_char)opts.ipopt_list[i]; + if (c == IPOPT_LSRR || c == IPOPT_SSRR) { + close(sock); + return (FALSE); + } + if (c == IPOPT_EOL) + break; + i += (c == IPOPT_NOP) ? 1 : + (u_char)opts.ipopt_list[i+1]; + } + } + } +#endif + + /* + * XXX careful for ftp bounce attacks. If discovered, close the + * socket and look for another connection. + */ + if (addr.sin_port == htons(20)) { + close(sock); + return (FALSE); + } + + /* + * make a new transporter (re-uses xprt) + */ + xprt = makefd_xprt(sock, r->sendsize, r->recvsize); + xprt->xp_raddr = addr; + xprt->xp_addrlen = len; + return (FALSE); /* there is never an rpc msg to be processed */ +} + +static enum xprt_stat +rendezvous_stat() +{ + + return (XPRT_IDLE); +} + +static void +svctcp_destroy(xprt) + register SVCXPRT *xprt; +{ + register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1; + + xprt_unregister(xprt); + if (xprt->xp_sock != -1) + (void)close(xprt->xp_sock); + xprt->xp_sock = -1; + if (xprt->xp_port != 0) { + /* a rendezvouser socket */ + xprt->xp_port = 0; + } else { + /* an actual connection socket */ + XDR_DESTROY(&(cd->xdrs)); + } + if (xprt->xp_auth != NULL) { + SVCAUTH_DESTROY(xprt->xp_auth); + xprt->xp_auth = NULL; + } + mem_free((caddr_t)cd, sizeof(struct tcp_conn)); + mem_free((caddr_t)xprt, sizeof(SVCXPRT)); +} + +/* + * All read operations timeout after 35 seconds. + * A timeout is fatal for the connection. + */ +static struct timeval wait_per_try = { 35, 0 }; + +/* + * reads data from the tcp conection. + * any error is fatal and the connection is closed. + * (And a read of zero bytes is a half closed stream => error.) + */ +static int +readtcp(xprt, buf, len) + register SVCXPRT *xprt; + caddr_t buf; + register int len; +{ + register int sock = xprt->xp_sock; + struct timeval start, delta; + struct timeval tmp1, tmp2; + fd_set *fds = NULL; + int prevbytes = 0, bytes; + extern int __svc_fdsetsize; + extern fd_set *__svc_fdset; + + delta = wait_per_try; + gettimeofday(&start, NULL); + do { + bytes = howmany(__svc_fdsetsize, NFDBITS) * sizeof(fd_mask); + if (bytes != prevbytes) { + if (fds) + free(fds); + fds = (fd_set *)malloc(bytes); + prevbytes = bytes; + } + if (fds == NULL) + goto fatal_err; + memcpy(fds, __svc_fdset, bytes); + + FD_SET(sock, fds); + switch (select(svc_maxfd+1, fds, NULL, NULL, &delta)) { + case -1: + if (errno != EINTR) + goto fatal_err; + gettimeofday(&tmp1, NULL); + timersub(&tmp1, &start, &tmp2); + timersub(&wait_per_try, &tmp2, &tmp1); + if (tmp1.tv_sec < 0 || !timerisset(&tmp1)) + goto fatal_err; + delta = tmp1; + continue; + case 0: + goto fatal_err; + default: + if (!FD_ISSET(sock, fds)) { + svc_getreqset2(fds, svc_maxfd+1); + gettimeofday(&tmp1, NULL); + timersub(&tmp1, &start, &tmp2); + timersub(&wait_per_try, &tmp2, &tmp1); + if (tmp1.tv_sec < 0 || !timerisset(&tmp1)) + goto fatal_err; + delta = tmp1; + continue; + } + } + } while (!FD_ISSET(sock, fds)); + if ((len = read(sock, buf, len)) > 0) { + if (fds) + free(fds); + return (len); + } +fatal_err: + ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; + if (fds) + free(fds); + return (-1); +} + +/* + * writes data to the tcp connection. + * Any error is fatal and the connection is closed. + */ +static int +writetcp(xprt, buf, len) + register SVCXPRT *xprt; + caddr_t buf; + int len; +{ + register int i, cnt; + + for (cnt = len; cnt > 0; cnt -= i, buf += i) { + if ((i = write(xprt->xp_sock, buf, cnt)) < 0) { + ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = + XPRT_DIED; + return (-1); + } + } + return (len); +} + +static enum xprt_stat +svctcp_stat(xprt) + SVCXPRT *xprt; +{ + register struct tcp_conn *cd = + (struct tcp_conn *)(xprt->xp_p1); + + if (cd->strm_stat == XPRT_DIED) + return (XPRT_DIED); + if (! xdrrec_eof(&(cd->xdrs))) + return (XPRT_MOREREQS); + return (XPRT_IDLE); +} + +static bool_t +svctcp_recv(xprt, msg) + SVCXPRT *xprt; + register struct rpc_msg *msg; +{ + register struct tcp_conn *cd = + (struct tcp_conn *)(xprt->xp_p1); + register XDR *xdrs = &(cd->xdrs); + + xdrs->x_op = XDR_DECODE; + (void)xdrrec_skiprecord(xdrs); + if (xdr_callmsg(xdrs, msg)) { + cd->x_id = msg->rm_xid; + return (TRUE); + } + cd->strm_stat = XPRT_DIED; /* XXX */ + return (FALSE); +} + +static bool_t +svctcp_getargs(xprt, xdr_args, args_ptr) + SVCXPRT *xprt; + xdrproc_t xdr_args; + caddr_t args_ptr; +{ + return (SVCAUTH_UNWRAP(xprt->xp_auth, + &(((struct tcp_conn *)(xprt->xp_p1))->xdrs), + xdr_args, args_ptr)); +} + +static bool_t +svctcp_freeargs(xprt, xdr_args, args_ptr) + SVCXPRT *xprt; + xdrproc_t xdr_args; + caddr_t args_ptr; +{ + register XDR *xdrs = + &(((struct tcp_conn *)(xprt->xp_p1))->xdrs); + + xdrs->x_op = XDR_FREE; + return ((*xdr_args)(xdrs, args_ptr)); +} + +static bool_t +svctcp_reply(xprt, msg) + SVCXPRT *xprt; + register struct rpc_msg *msg; +{ + register struct tcp_conn *cd = + (struct tcp_conn *)(xprt->xp_p1); + register XDR *xdrs = &(cd->xdrs); + xdrproc_t xdr_proc; + caddr_t xdr_where; + + xdrs->x_op = XDR_ENCODE; + msg->rm_xid = cd->x_id; + + if (msg->rm_reply.rp_stat == MSG_ACCEPTED && + msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { + xdr_proc = msg->acpted_rply.ar_results.proc; + xdr_where = msg->acpted_rply.ar_results.where; + msg->acpted_rply.ar_results.proc = xdr_void; + msg->acpted_rply.ar_results.where = NULL; + + if (!xdr_replymsg(xdrs, msg) || + !SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_proc, xdr_where)) + return (FALSE); + } + else if (!xdr_replymsg(xdrs, msg)) { + return (FALSE); + } + (void)xdrrec_endofrecord(xdrs, TRUE); + + return (TRUE); +}