[df49c60] | 1 | /* |
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| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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| 3 | * unrestricted use provided that this legend is included on all tape |
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| 4 | * media and as a part of the software program in whole or part. Users |
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| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
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| 6 | * to license or distribute it to anyone else except as part of a product or |
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| 7 | * program developed by the user. |
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| 8 | * |
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| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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| 12 | * |
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| 13 | * Sun RPC is provided with no support and without any obligation on the |
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| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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| 15 | * modification or enhancement. |
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| 16 | * |
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| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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| 19 | * OR ANY PART THEREOF. |
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| 20 | * |
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| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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| 22 | * or profits or other special, indirect and consequential damages, even if |
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| 23 | * Sun has been advised of the possibility of such damages. |
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| 24 | * |
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| 25 | * Sun Microsystems, Inc. |
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| 26 | * 2550 Garcia Avenue |
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| 27 | * Mountain View, California 94043 |
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| 28 | */ |
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| 29 | |
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| 30 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 31 | /*static char *sccsid = "from: @(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/ |
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| 32 | /*static char *sccsid = "from: @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC";*/ |
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| 33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc_tcp.c,v 1.18 2000/01/27 23:06:41 jasone Exp $"; |
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| 34 | #endif |
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| 35 | |
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| 36 | /* |
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| 37 | * svc_tcp.c, Server side for TCP/IP based RPC. |
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| 38 | * |
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| 39 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 40 | * |
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| 41 | * Actually implements two flavors of transporter - |
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| 42 | * a tcp rendezvouser (a listner and connection establisher) |
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| 43 | * and a record/tcp stream. |
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| 44 | */ |
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| 45 | |
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| 46 | #include <stdio.h> |
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| 47 | #include <stdlib.h> |
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| 48 | #include <unistd.h> |
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| 49 | #include <string.h> |
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| 50 | #include <rpc/rpc.h> |
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| 51 | #include <sys/socket.h> |
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| 52 | #include <sys/ioctl.h> |
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| 53 | #include <errno.h> |
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| 54 | |
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| 55 | /* |
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| 56 | * Ops vector for TCP/IP based rpc service handle |
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| 57 | */ |
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| 58 | static bool_t svctcp_recv(); |
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| 59 | static enum xprt_stat svctcp_stat(); |
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| 60 | static bool_t svctcp_getargs(); |
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| 61 | static bool_t svctcp_reply(); |
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| 62 | static bool_t svctcp_freeargs(); |
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| 63 | static void svctcp_destroy(); |
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| 64 | |
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| 65 | static struct xp_ops svctcp_op = { |
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| 66 | svctcp_recv, |
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| 67 | svctcp_stat, |
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| 68 | svctcp_getargs, |
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| 69 | svctcp_reply, |
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| 70 | svctcp_freeargs, |
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| 71 | svctcp_destroy |
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| 72 | }; |
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| 73 | |
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| 74 | /* |
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| 75 | * Ops vector for TCP/IP rendezvous handler |
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| 76 | */ |
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| 77 | static bool_t rendezvous_request(); |
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| 78 | static enum xprt_stat rendezvous_stat(); |
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| 79 | |
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| 80 | static struct xp_ops svctcp_rendezvous_op = { |
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| 81 | rendezvous_request, |
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| 82 | rendezvous_stat, |
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| 83 | (bool_t (*)())abort, |
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| 84 | (bool_t (*)())abort, |
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| 85 | (bool_t (*)())abort, |
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| 86 | svctcp_destroy |
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| 87 | }; |
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| 88 | |
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| 89 | static int readtcp(), writetcp(); |
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| 90 | static SVCXPRT *makefd_xprt(); |
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| 91 | |
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| 92 | struct tcp_rendezvous { /* kept in xprt->xp_p1 */ |
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| 93 | u_int sendsize; |
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| 94 | u_int recvsize; |
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| 95 | }; |
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| 96 | |
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| 97 | struct tcp_conn { /* kept in xprt->xp_p1 */ |
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| 98 | enum xprt_stat strm_stat; |
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| 99 | u_long x_id; |
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| 100 | XDR xdrs; |
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| 101 | char verf_body[MAX_AUTH_BYTES]; |
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| 102 | }; |
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| 103 | |
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| 104 | /* |
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| 105 | * Usage: |
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| 106 | * xprt = svctcp_create(sock, send_buf_size, recv_buf_size); |
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| 107 | * |
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| 108 | * Creates, registers, and returns a (rpc) tcp based transporter. |
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| 109 | * Once *xprt is initialized, it is registered as a transporter |
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| 110 | * see (svc.h, xprt_register). This routine returns |
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| 111 | * a NULL if a problem occurred. |
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| 112 | * |
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| 113 | * If sock<0 then a socket is created, else sock is used. |
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| 114 | * If the socket, sock is not bound to a port then svctcp_create |
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| 115 | * binds it to an arbitrary port. The routine then starts a tcp |
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| 116 | * listener on the socket's associated port. In any (successful) case, |
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| 117 | * xprt->xp_sock is the registered socket number and xprt->xp_port is the |
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| 118 | * associated port number. |
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| 119 | * |
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| 120 | * Since tcp streams do buffered io similar to stdio, the caller can specify |
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| 121 | * how big the send and receive buffers are via the second and third parms; |
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| 122 | * 0 => use the system default. |
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| 123 | */ |
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| 124 | SVCXPRT * |
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| 125 | svctcp_create(sock, sendsize, recvsize) |
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| 126 | register int sock; |
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| 127 | u_int sendsize; |
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| 128 | u_int recvsize; |
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| 129 | { |
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| 130 | bool_t madesock = FALSE; |
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| 131 | register SVCXPRT *xprt; |
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| 132 | register struct tcp_rendezvous *r; |
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| 133 | struct sockaddr_in addr; |
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| 134 | int len = sizeof(struct sockaddr_in); |
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| 135 | int on; |
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| 136 | |
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| 137 | if (sock == RPC_ANYSOCK) { |
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| 138 | if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { |
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| 139 | perror("svctcp_.c - udp socket creation problem"); |
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| 140 | return ((SVCXPRT *)NULL); |
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| 141 | } |
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| 142 | madesock = TRUE; |
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| 143 | } |
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| 144 | on = 1; |
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| 145 | if (ioctl(sock, FIONBIO, &on) < 0) { |
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| 146 | perror("svc_tcp.c - cannot turn on non-blocking mode"); |
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| 147 | if (madesock) |
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| 148 | (void)_close(sock); |
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| 149 | return ((SVCXPRT *)NULL); |
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| 150 | } |
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| 151 | memset(&addr, 0, sizeof (addr)); |
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| 152 | addr.sin_len = sizeof(struct sockaddr_in); |
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| 153 | addr.sin_family = AF_INET; |
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| 154 | if (bindresvport(sock, &addr)) { |
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| 155 | addr.sin_port = 0; |
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| 156 | (void)bind(sock, (struct sockaddr *)&addr, len); |
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| 157 | } |
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| 158 | if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) || |
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| 159 | (listen(sock, 2) != 0)) { |
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| 160 | perror("svctcp_.c - cannot getsockname or listen"); |
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| 161 | if (madesock) |
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| 162 | (void)_close(sock); |
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| 163 | return ((SVCXPRT *)NULL); |
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| 164 | } |
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| 165 | r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r)); |
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| 166 | if (r == NULL) { |
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| 167 | (void) fprintf(stderr, "svctcp_create: out of memory\n"); |
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| 168 | return (NULL); |
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| 169 | } |
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| 170 | r->sendsize = sendsize; |
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| 171 | r->recvsize = recvsize; |
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| 172 | xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); |
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| 173 | if (xprt == NULL) { |
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| 174 | (void) fprintf(stderr, "svctcp_create: out of memory\n"); |
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| 175 | return (NULL); |
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| 176 | } |
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| 177 | xprt->xp_p2 = NULL; |
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| 178 | xprt->xp_p1 = (caddr_t)r; |
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| 179 | xprt->xp_verf = _null_auth; |
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| 180 | xprt->xp_ops = &svctcp_rendezvous_op; |
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| 181 | xprt->xp_port = ntohs(addr.sin_port); |
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| 182 | xprt->xp_sock = sock; |
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| 183 | xprt_register(xprt); |
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| 184 | return (xprt); |
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| 185 | } |
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| 186 | |
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| 187 | /* |
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| 188 | * Like svtcp_create(), except the routine takes any *open* UNIX file |
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| 189 | * descriptor as its first input. |
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| 190 | */ |
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| 191 | SVCXPRT * |
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| 192 | svcfd_create(fd, sendsize, recvsize) |
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| 193 | int fd; |
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| 194 | u_int sendsize; |
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| 195 | u_int recvsize; |
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| 196 | { |
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| 197 | |
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| 198 | return (makefd_xprt(fd, sendsize, recvsize)); |
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| 199 | } |
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| 200 | |
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| 201 | static SVCXPRT * |
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| 202 | makefd_xprt(fd, sendsize, recvsize) |
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| 203 | int fd; |
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| 204 | u_int sendsize; |
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| 205 | u_int recvsize; |
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| 206 | { |
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| 207 | register SVCXPRT *xprt; |
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| 208 | register struct tcp_conn *cd; |
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| 209 | |
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| 210 | xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); |
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| 211 | if (xprt == (SVCXPRT *)NULL) { |
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| 212 | (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n"); |
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| 213 | goto done; |
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| 214 | } |
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| 215 | cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn)); |
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| 216 | if (cd == (struct tcp_conn *)NULL) { |
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| 217 | (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n"); |
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| 218 | mem_free((char *) xprt, sizeof(SVCXPRT)); |
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| 219 | xprt = (SVCXPRT *)NULL; |
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| 220 | goto done; |
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| 221 | } |
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| 222 | cd->strm_stat = XPRT_IDLE; |
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| 223 | xdrrec_create(&(cd->xdrs), sendsize, recvsize, |
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| 224 | (caddr_t)xprt, readtcp, writetcp); |
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| 225 | xprt->xp_p2 = NULL; |
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| 226 | xprt->xp_p1 = (caddr_t)cd; |
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| 227 | xprt->xp_verf.oa_base = cd->verf_body; |
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| 228 | xprt->xp_addrlen = 0; |
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| 229 | xprt->xp_ops = &svctcp_op; /* truely deals with calls */ |
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| 230 | xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ |
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| 231 | xprt->xp_sock = fd; |
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| 232 | xprt_register(xprt); |
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| 233 | done: |
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| 234 | return (xprt); |
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| 235 | } |
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| 236 | |
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| 237 | static bool_t |
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| 238 | rendezvous_request(xprt) |
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| 239 | register SVCXPRT *xprt; |
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| 240 | { |
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| 241 | int sock; |
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| 242 | struct tcp_rendezvous *r; |
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| 243 | struct sockaddr_in addr; |
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| 244 | int len; |
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| 245 | int off; |
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| 246 | |
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| 247 | r = (struct tcp_rendezvous *)xprt->xp_p1; |
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| 248 | again: |
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| 249 | len = sizeof(struct sockaddr_in); |
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| 250 | if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr, |
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| 251 | &len)) < 0) { |
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| 252 | if (errno == EINTR) |
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| 253 | goto again; |
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| 254 | return (FALSE); |
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| 255 | } |
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| 256 | /* |
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| 257 | * Guard against FTP bounce attacks. |
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| 258 | */ |
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| 259 | if (addr.sin_port == htons(20)) { |
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| 260 | _close(sock); |
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| 261 | return (FALSE); |
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| 262 | } |
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| 263 | /* |
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| 264 | * The listening socket is in FIONBIO mode and we inherit it. |
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| 265 | */ |
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| 266 | off = 0; |
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| 267 | if (ioctl(sock, FIONBIO, &off) < 0) { |
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| 268 | _close(sock); |
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| 269 | return (FALSE); |
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| 270 | } |
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| 271 | /* |
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| 272 | * make a new transporter (re-uses xprt) |
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| 273 | */ |
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| 274 | xprt = makefd_xprt(sock, r->sendsize, r->recvsize); |
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| 275 | xprt->xp_raddr = addr; |
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| 276 | xprt->xp_addrlen = len; |
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| 277 | return (FALSE); /* there is never an rpc msg to be processed */ |
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| 278 | } |
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| 279 | |
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| 280 | static enum xprt_stat |
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| 281 | rendezvous_stat() |
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| 282 | { |
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| 283 | |
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| 284 | return (XPRT_IDLE); |
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| 285 | } |
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| 286 | |
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| 287 | static void |
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| 288 | svctcp_destroy(xprt) |
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| 289 | register SVCXPRT *xprt; |
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| 290 | { |
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| 291 | register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1; |
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| 292 | |
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| 293 | xprt_unregister(xprt); |
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| 294 | (void)_close(xprt->xp_sock); |
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| 295 | if (xprt->xp_port != 0) { |
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| 296 | /* a rendezvouser socket */ |
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| 297 | xprt->xp_port = 0; |
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| 298 | } else { |
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| 299 | /* an actual connection socket */ |
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| 300 | XDR_DESTROY(&(cd->xdrs)); |
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| 301 | } |
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| 302 | mem_free((caddr_t)cd, sizeof(struct tcp_conn)); |
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| 303 | mem_free((caddr_t)xprt, sizeof(SVCXPRT)); |
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| 304 | } |
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| 305 | |
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| 306 | /* |
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| 307 | * All read operations timeout after 35 seconds. |
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| 308 | * A timeout is fatal for the connection. |
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| 309 | */ |
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| 310 | static struct timeval wait_per_try = { 35, 0 }; |
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| 311 | |
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| 312 | /* |
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| 313 | * reads data from the tcp conection. |
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| 314 | * any error is fatal and the connection is closed. |
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| 315 | * (And a read of zero bytes is a half closed stream => error.) |
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| 316 | * |
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| 317 | * Note: we have to be careful here not to allow ourselves to become |
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| 318 | * blocked too long in this routine. While we're waiting for data from one |
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| 319 | * client, another client may be trying to connect. To avoid this situation, |
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| 320 | * some code from svc_run() is transplanted here: the select() loop checks |
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| 321 | * all RPC descriptors including the one we want and calls svc_getreqset2() |
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| 322 | * to handle new requests if any are detected. |
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| 323 | */ |
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| 324 | static int |
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| 325 | readtcp(xprt, buf, len) |
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| 326 | register SVCXPRT *xprt; |
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| 327 | caddr_t buf; |
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| 328 | register int len; |
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| 329 | { |
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| 330 | register int sock = xprt->xp_sock; |
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| 331 | struct timeval start, delta, tv; |
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| 332 | struct timeval tmp1, tmp2; |
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| 333 | fd_set *fds; |
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| 334 | |
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| 335 | delta = wait_per_try; |
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| 336 | fds = NULL; |
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| 337 | gettimeofday(&start, NULL); |
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| 338 | do { |
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| 339 | int bytes = sizeof (fd_set); |
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| 340 | if (fds != NULL) |
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| 341 | free(fds); |
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| 342 | fds = (fd_set *)malloc(bytes); |
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| 343 | if (fds == NULL) |
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| 344 | goto fatal_err; |
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| 345 | memcpy(fds, __svc_fdset, bytes); |
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| 346 | |
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| 347 | /* XXX we know the other bits are still clear */ |
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| 348 | FD_SET(sock, fds); |
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| 349 | tv = delta; /* in case select() implements writeback */ |
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| 350 | switch (select(svc_maxfd + 1, fds, NULL, NULL, &tv)) { |
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| 351 | case -1: |
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| 352 | if (errno != EINTR) |
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| 353 | goto fatal_err; |
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| 354 | gettimeofday(&tmp1, NULL); |
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| 355 | timersub(&tmp1, &start, &tmp2); |
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| 356 | timersub(&wait_per_try, &tmp2, &tmp1); |
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| 357 | if (tmp1.tv_sec < 0 || !timerisset(&tmp1)) |
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| 358 | goto fatal_err; |
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| 359 | delta = tmp1; |
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| 360 | continue; |
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| 361 | case 0: |
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| 362 | goto fatal_err; |
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| 363 | default: |
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| 364 | if (!FD_ISSET(sock, fds)) { |
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| 365 | svc_getreqset2(fds, svc_maxfd + 1); |
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| 366 | gettimeofday(&tmp1, NULL); |
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| 367 | timersub(&tmp1, &start, &tmp2); |
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| 368 | timersub(&wait_per_try, &tmp2, &tmp1); |
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| 369 | if (tmp1.tv_sec < 0 || !timerisset(&tmp1)) |
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| 370 | goto fatal_err; |
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| 371 | delta = tmp1; |
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| 372 | continue; |
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| 373 | } |
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| 374 | } |
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| 375 | } while (!FD_ISSET(sock, fds)); |
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| 376 | if ((len = _read(sock, buf, len)) > 0) { |
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| 377 | if (fds != NULL) |
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| 378 | free(fds); |
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| 379 | return (len); |
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| 380 | } |
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| 381 | fatal_err: |
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| 382 | ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; |
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| 383 | if (fds != NULL) |
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| 384 | free(fds); |
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| 385 | return (-1); |
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| 386 | } |
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| 387 | |
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| 388 | /* |
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| 389 | * writes data to the tcp connection. |
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| 390 | * Any error is fatal and the connection is closed. |
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| 391 | */ |
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| 392 | static int |
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| 393 | writetcp(xprt, buf, len) |
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| 394 | register SVCXPRT *xprt; |
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| 395 | caddr_t buf; |
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| 396 | int len; |
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| 397 | { |
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| 398 | register int i, cnt; |
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| 399 | |
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| 400 | for (cnt = len; cnt > 0; cnt -= i, buf += i) { |
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| 401 | if ((i = _write(xprt->xp_sock, buf, cnt)) < 0) { |
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| 402 | ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = |
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| 403 | XPRT_DIED; |
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| 404 | return (-1); |
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| 405 | } |
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| 406 | } |
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| 407 | return (len); |
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| 408 | } |
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| 409 | |
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| 410 | static enum xprt_stat |
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| 411 | svctcp_stat(xprt) |
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| 412 | SVCXPRT *xprt; |
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| 413 | { |
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| 414 | register struct tcp_conn *cd = |
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| 415 | (struct tcp_conn *)(xprt->xp_p1); |
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| 416 | |
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| 417 | if (cd->strm_stat == XPRT_DIED) |
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| 418 | return (XPRT_DIED); |
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| 419 | if (! xdrrec_eof(&(cd->xdrs))) |
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| 420 | return (XPRT_MOREREQS); |
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| 421 | return (XPRT_IDLE); |
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| 422 | } |
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| 423 | |
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| 424 | static bool_t |
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| 425 | svctcp_recv(xprt, msg) |
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| 426 | SVCXPRT *xprt; |
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| 427 | register struct rpc_msg *msg; |
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| 428 | { |
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| 429 | register struct tcp_conn *cd = |
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| 430 | (struct tcp_conn *)(xprt->xp_p1); |
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| 431 | register XDR *xdrs = &(cd->xdrs); |
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| 432 | |
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| 433 | xdrs->x_op = XDR_DECODE; |
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| 434 | (void)xdrrec_skiprecord(xdrs); |
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| 435 | if (xdr_callmsg(xdrs, msg)) { |
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| 436 | cd->x_id = msg->rm_xid; |
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| 437 | return (TRUE); |
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| 438 | } |
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| 439 | cd->strm_stat = XPRT_DIED; /* XXXX */ |
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| 440 | return (FALSE); |
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| 441 | } |
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| 442 | |
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| 443 | static bool_t |
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| 444 | svctcp_getargs(xprt, xdr_args, args_ptr) |
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| 445 | SVCXPRT *xprt; |
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| 446 | xdrproc_t xdr_args; |
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| 447 | caddr_t args_ptr; |
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| 448 | { |
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| 449 | |
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| 450 | return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr)); |
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| 451 | } |
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| 452 | |
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| 453 | static bool_t |
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| 454 | svctcp_freeargs(xprt, xdr_args, args_ptr) |
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| 455 | SVCXPRT *xprt; |
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| 456 | xdrproc_t xdr_args; |
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| 457 | caddr_t args_ptr; |
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| 458 | { |
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| 459 | register XDR *xdrs = |
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| 460 | &(((struct tcp_conn *)(xprt->xp_p1))->xdrs); |
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| 461 | |
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| 462 | xdrs->x_op = XDR_FREE; |
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| 463 | return ((*xdr_args)(xdrs, args_ptr)); |
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| 464 | } |
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| 465 | |
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| 466 | static bool_t |
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| 467 | svctcp_reply(xprt, msg) |
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| 468 | SVCXPRT *xprt; |
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| 469 | register struct rpc_msg *msg; |
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| 470 | { |
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| 471 | register struct tcp_conn *cd = |
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| 472 | (struct tcp_conn *)(xprt->xp_p1); |
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| 473 | register XDR *xdrs = &(cd->xdrs); |
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| 474 | register bool_t stat; |
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| 475 | |
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| 476 | xdrs->x_op = XDR_ENCODE; |
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| 477 | msg->rm_xid = cd->x_id; |
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| 478 | stat = xdr_replymsg(xdrs, msg); |
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| 479 | (void)xdrrec_endofrecord(xdrs, TRUE); |
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| 480 | return (stat); |
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| 481 | } |
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