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_udp.c 1.24 87/08/11 Copyr 1984 Sun Micro";*/ |
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32 | /*static char *sccsid = "from: @(#)svc_udp.c 2.2 88/07/29 4.0 RPCSRC";*/ |
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33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc_udp.c,v 1.13 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_udp.c, |
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38 | * Server side for UDP/IP based RPC. (Does some caching in the hopes of |
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39 | * achieving execute-at-most-once semantics.) |
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40 | * |
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41 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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42 | */ |
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43 | |
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44 | #include <stdio.h> |
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45 | #include <stdlib.h> |
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46 | #include <unistd.h> |
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47 | #include <string.h> |
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48 | #include <rpc/rpc.h> |
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49 | #include <sys/socket.h> |
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50 | #include <errno.h> |
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51 | |
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52 | #define rpc_buffer(xprt) ((xprt)->xp_p1) |
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53 | #define MAX(a, b) ((a > b) ? a : b) |
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54 | |
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55 | static bool_t svcudp_recv(SVCXPRT *xprt, struct rpc_msg *msg); |
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56 | static bool_t svcudp_reply(SVCXPRT *xprt, struct rpc_msg *msg); |
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57 | static enum xprt_stat svcudp_stat(SVCXPRT *xprt); |
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58 | static bool_t svcudp_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr); |
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59 | static bool_t svcudp_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr); |
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60 | static void svcudp_destroy(SVCXPRT *xprt); |
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61 | static void cache_set (SVCXPRT *, u_long); |
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62 | static int cache_get (SVCXPRT *, struct rpc_msg *, char **, u_long *); |
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63 | |
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64 | static struct xp_ops svcudp_op = { |
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65 | svcudp_recv, |
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66 | svcudp_stat, |
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67 | svcudp_getargs, |
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68 | svcudp_reply, |
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69 | svcudp_freeargs, |
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70 | svcudp_destroy |
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71 | }; |
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72 | |
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73 | /* |
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74 | * kept in xprt->xp_p2 |
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75 | */ |
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76 | struct svcudp_data { |
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77 | u_int su_iosz; /* byte size of send.recv buffer */ |
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78 | u_long su_xid; /* transaction id */ |
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79 | XDR su_xdrs; /* XDR handle */ |
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80 | char su_verfbody[MAX_AUTH_BYTES]; /* verifier body */ |
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81 | char * su_cache; /* cached data, NULL if no cache */ |
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82 | }; |
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83 | #define su_data(xprt) ((struct svcudp_data *)(xprt->xp_p2)) |
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84 | |
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85 | /* |
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86 | * Usage: |
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87 | * xprt = svcudp_create(sock); |
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88 | * |
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89 | * If sock<0 then a socket is created, else sock is used. |
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90 | * If the socket, sock is not bound to a port then svcudp_create |
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91 | * binds it to an arbitrary port. In any (successful) case, |
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92 | * xprt->xp_sock is the registered socket number and xprt->xp_port is the |
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93 | * associated port number. |
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94 | * Once *xprt is initialized, it is registered as a transporter; |
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95 | * see (svc.h, xprt_register). |
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96 | * The routines returns NULL if a problem occurred. |
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97 | */ |
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98 | SVCXPRT * |
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99 | svcudp_bufcreate( |
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100 | int sock, |
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101 | u_int sendsz, |
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102 | u_int recvsz ) |
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103 | { |
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104 | bool_t madesock = FALSE; |
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105 | register SVCXPRT *xprt; |
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106 | register struct svcudp_data *su; |
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107 | struct sockaddr_in addr; |
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108 | socklen_t len = sizeof(struct sockaddr_in); |
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109 | |
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110 | if (sock == RPC_ANYSOCK) { |
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111 | if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { |
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112 | perror("svcudp_create: socket creation problem"); |
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113 | return ((SVCXPRT *)NULL); |
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114 | } |
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115 | madesock = TRUE; |
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116 | } |
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117 | memset((char *)&addr, 0, sizeof (addr)); |
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118 | addr.sin_len = sizeof(struct sockaddr_in); |
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119 | addr.sin_family = AF_INET; |
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120 | if (bindresvport(sock, &addr)) { |
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121 | addr.sin_port = 0; |
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122 | (void)bind(sock, (struct sockaddr *)&addr, len); |
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123 | } |
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124 | if (getsockname(sock, (struct sockaddr *)&addr, &len) != 0) { |
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125 | perror("svcudp_create - cannot getsockname"); |
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126 | if (madesock) |
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127 | (void)_RPC_close(sock); |
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128 | return ((SVCXPRT *)NULL); |
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129 | } |
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130 | xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); |
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131 | if (xprt == NULL) { |
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132 | (void)fprintf(stderr, "svcudp_create: out of memory\n"); |
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133 | return (NULL); |
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134 | } |
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135 | su = (struct svcudp_data *)mem_alloc(sizeof(*su)); |
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136 | if (su == NULL) { |
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137 | (void)fprintf(stderr, "svcudp_create: out of memory\n"); |
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138 | return (NULL); |
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139 | } |
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140 | su->su_iosz = ((MAX(sendsz, recvsz) + 3) / 4) * 4; |
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141 | if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) { |
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142 | (void)fprintf(stderr, "svcudp_create: out of memory\n"); |
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143 | return (NULL); |
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144 | } |
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145 | xdrmem_create( |
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146 | &(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_DECODE); |
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147 | su->su_cache = NULL; |
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148 | xprt->xp_p2 = (caddr_t)su; |
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149 | xprt->xp_verf.oa_base = su->su_verfbody; |
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150 | xprt->xp_ops = &svcudp_op; |
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151 | xprt->xp_port = ntohs(addr.sin_port); |
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152 | xprt->xp_sock = sock; |
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153 | xprt_register(xprt); |
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154 | return (xprt); |
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155 | } |
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156 | |
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157 | SVCXPRT * |
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158 | svcudp_create( |
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159 | int sock) |
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160 | { |
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161 | |
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162 | return(svcudp_bufcreate(sock, UDPMSGSIZE, UDPMSGSIZE)); |
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163 | } |
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164 | |
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165 | static enum xprt_stat |
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166 | svcudp_stat( |
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167 | SVCXPRT *xprt) |
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168 | { |
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169 | |
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170 | return (XPRT_IDLE); |
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171 | } |
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172 | |
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173 | static bool_t |
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174 | svcudp_recv( |
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175 | SVCXPRT *xprt, |
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176 | struct rpc_msg *msg) |
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177 | { |
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178 | register struct svcudp_data *su = su_data(xprt); |
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179 | register XDR *xdrs = &(su->su_xdrs); |
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180 | register int rlen; |
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181 | char *reply; |
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182 | u_long replylen; |
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183 | |
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184 | again: |
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185 | xprt->xp_addrlen = sizeof(struct sockaddr_in); |
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186 | rlen = recvfrom(xprt->xp_sock, rpc_buffer(xprt), (int) su->su_iosz, |
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187 | 0, (struct sockaddr *)&(xprt->xp_raddr), &(xprt->xp_addrlen)); |
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188 | if (rlen == -1 && errno == EINTR) |
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189 | goto again; |
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190 | if (rlen == -1 || rlen < 4*sizeof(u_int32_t)) |
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191 | return (FALSE); |
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192 | xdrs->x_op = XDR_DECODE; |
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193 | XDR_SETPOS(xdrs, 0); |
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194 | if (! xdr_callmsg(xdrs, msg)) |
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195 | return (FALSE); |
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196 | su->su_xid = msg->rm_xid; |
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197 | if (su->su_cache != NULL) { |
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198 | if (cache_get(xprt, msg, &reply, &replylen)) { |
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199 | (void) sendto(xprt->xp_sock, reply, (int) replylen, 0, |
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200 | (struct sockaddr *) &xprt->xp_raddr, xprt->xp_addrlen); |
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201 | return (TRUE); |
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202 | } |
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203 | } |
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204 | return (TRUE); |
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205 | } |
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206 | |
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207 | static bool_t |
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208 | svcudp_reply( |
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209 | SVCXPRT *xprt, |
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210 | struct rpc_msg *msg) |
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211 | { |
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212 | register struct svcudp_data *su = su_data(xprt); |
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213 | register XDR *xdrs = &(su->su_xdrs); |
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214 | register int slen; |
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215 | register bool_t stat = FALSE; |
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216 | |
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217 | xdrs->x_op = XDR_ENCODE; |
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218 | XDR_SETPOS(xdrs, 0); |
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219 | msg->rm_xid = su->su_xid; |
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220 | if (xdr_replymsg(xdrs, msg)) { |
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221 | slen = (int)XDR_GETPOS(xdrs); |
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222 | if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0, |
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223 | (struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen) |
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224 | == slen) { |
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225 | stat = TRUE; |
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226 | if (su->su_cache && slen >= 0) { |
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227 | cache_set(xprt, (u_long) slen); |
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228 | } |
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229 | } |
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230 | } |
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231 | return (stat); |
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232 | } |
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233 | |
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234 | static bool_t |
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235 | svcudp_getargs( |
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236 | SVCXPRT *xprt, |
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237 | xdrproc_t xdr_args, |
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238 | caddr_t args_ptr) |
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239 | { |
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240 | |
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241 | return ((*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr)); |
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242 | } |
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243 | |
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244 | static bool_t |
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245 | svcudp_freeargs( |
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246 | SVCXPRT *xprt, |
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247 | xdrproc_t xdr_args, |
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248 | caddr_t args_ptr) |
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249 | { |
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250 | register XDR *xdrs = &(su_data(xprt)->su_xdrs); |
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251 | |
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252 | xdrs->x_op = XDR_FREE; |
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253 | return ((*xdr_args)(xdrs, args_ptr)); |
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254 | } |
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255 | |
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256 | static void |
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257 | svcudp_destroy( |
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258 | SVCXPRT *xprt) |
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259 | { |
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260 | register struct svcudp_data *su = su_data(xprt); |
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261 | |
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262 | xprt_unregister(xprt); |
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263 | (void)_RPC_close(xprt->xp_sock); |
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264 | XDR_DESTROY(&(su->su_xdrs)); |
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265 | mem_free(rpc_buffer(xprt), su->su_iosz); |
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266 | mem_free((caddr_t)su, sizeof(struct svcudp_data)); |
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267 | mem_free((caddr_t)xprt, sizeof(SVCXPRT)); |
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268 | } |
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269 | |
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270 | |
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271 | /***********this could be a separate file*********************/ |
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272 | |
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273 | /* |
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274 | * Fifo cache for udp server |
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275 | * Copies pointers to reply buffers into fifo cache |
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276 | * Buffers are sent again if retransmissions are detected. |
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277 | */ |
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278 | |
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279 | #define SPARSENESS 4 /* 75% sparse */ |
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280 | |
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281 | #define CACHE_PERROR(msg) \ |
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282 | (void) fprintf(stderr,"%s\n", msg) |
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283 | |
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284 | #define ALLOC(type, size) \ |
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285 | (type *) mem_alloc((unsigned) (sizeof(type) * (size))) |
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286 | |
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287 | #define BZERO(addr, type, size) \ |
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288 | memset((char *) addr, 0, sizeof(type) * (int) (size)) |
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289 | |
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290 | /* |
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291 | * An entry in the cache |
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292 | */ |
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293 | typedef struct cache_node *cache_ptr; |
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294 | struct cache_node { |
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295 | /* |
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296 | * Index into cache is xid, proc, vers, prog and address |
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297 | */ |
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298 | u_long cache_xid; |
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299 | u_long cache_proc; |
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300 | u_long cache_vers; |
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301 | u_long cache_prog; |
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302 | struct sockaddr_in cache_addr; |
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303 | /* |
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304 | * The cached reply and length |
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305 | */ |
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306 | char * cache_reply; |
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307 | u_long cache_replylen; |
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308 | /* |
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309 | * Next node on the list, if there is a collision |
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310 | */ |
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311 | cache_ptr cache_next; |
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312 | }; |
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313 | |
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314 | |
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315 | |
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316 | /* |
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317 | * The entire cache |
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318 | */ |
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319 | struct udp_cache { |
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320 | u_long uc_size; /* size of cache */ |
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321 | cache_ptr *uc_entries; /* hash table of entries in cache */ |
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322 | cache_ptr *uc_fifo; /* fifo list of entries in cache */ |
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323 | u_long uc_nextvictim; /* points to next victim in fifo list */ |
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324 | u_long uc_prog; /* saved program number */ |
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325 | u_long uc_vers; /* saved version number */ |
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326 | u_long uc_proc; /* saved procedure number */ |
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327 | struct sockaddr_in uc_addr; /* saved caller's address */ |
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328 | }; |
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329 | |
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330 | |
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331 | /* |
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332 | * the hashing function |
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333 | */ |
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334 | #define CACHE_LOC(transp, xid) \ |
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335 | (xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size)) |
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336 | |
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337 | |
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338 | /* |
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339 | * Enable use of the cache. |
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340 | * Note: there is no disable. |
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341 | */ |
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342 | int svcudp_enablecache( |
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343 | SVCXPRT *transp, |
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344 | u_long size) |
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345 | { |
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346 | struct svcudp_data *su = su_data(transp); |
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347 | struct udp_cache *uc; |
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348 | |
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349 | if (su->su_cache != NULL) { |
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350 | CACHE_PERROR("enablecache: cache already enabled"); |
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351 | return(0); |
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352 | } |
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353 | uc = ALLOC(struct udp_cache, 1); |
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354 | if (uc == NULL) { |
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355 | CACHE_PERROR("enablecache: could not allocate cache"); |
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356 | return(0); |
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357 | } |
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358 | uc->uc_size = size; |
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359 | uc->uc_nextvictim = 0; |
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360 | uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS); |
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361 | if (uc->uc_entries == NULL) { |
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362 | CACHE_PERROR("enablecache: could not allocate cache data"); |
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363 | return(0); |
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364 | } |
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365 | BZERO(uc->uc_entries, cache_ptr, size * SPARSENESS); |
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366 | uc->uc_fifo = ALLOC(cache_ptr, size); |
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367 | if (uc->uc_fifo == NULL) { |
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368 | CACHE_PERROR("enablecache: could not allocate cache fifo"); |
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369 | return(0); |
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370 | } |
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371 | BZERO(uc->uc_fifo, cache_ptr, size); |
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372 | su->su_cache = (char *) uc; |
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373 | return(1); |
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374 | } |
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375 | |
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376 | |
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377 | /* |
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378 | * Set an entry in the cache |
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379 | */ |
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380 | static void |
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381 | cache_set( |
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382 | SVCXPRT *xprt, |
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383 | u_long replylen) |
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384 | { |
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385 | register cache_ptr victim; |
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386 | register cache_ptr *vicp; |
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387 | register struct svcudp_data *su = su_data(xprt); |
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388 | struct udp_cache *uc = (struct udp_cache *) su->su_cache; |
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389 | u_int loc; |
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390 | char *newbuf; |
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391 | |
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392 | /* |
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393 | * Find space for the new entry, either by |
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394 | * reusing an old entry, or by mallocing a new one |
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395 | */ |
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396 | victim = uc->uc_fifo[uc->uc_nextvictim]; |
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397 | if (victim != NULL) { |
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398 | loc = CACHE_LOC(xprt, victim->cache_xid); |
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399 | for (vicp = &uc->uc_entries[loc]; |
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400 | *vicp != NULL && *vicp != victim; |
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401 | vicp = &(*vicp)->cache_next) |
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402 | ; |
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403 | if (*vicp == NULL) { |
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404 | CACHE_PERROR("cache_set: victim not found"); |
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405 | return; |
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406 | } |
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407 | *vicp = victim->cache_next; /* remote from cache */ |
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408 | newbuf = victim->cache_reply; |
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409 | } else { |
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410 | victim = ALLOC(struct cache_node, 1); |
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411 | if (victim == NULL) { |
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412 | CACHE_PERROR("cache_set: victim alloc failed"); |
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413 | return; |
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414 | } |
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415 | newbuf = mem_alloc(su->su_iosz); |
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416 | if (newbuf == NULL) { |
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417 | CACHE_PERROR("cache_set: could not allocate new rpc_buffer"); |
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418 | return; |
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419 | } |
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420 | } |
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421 | |
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422 | /* |
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423 | * Store it away |
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424 | */ |
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425 | victim->cache_replylen = replylen; |
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426 | victim->cache_reply = rpc_buffer(xprt); |
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427 | rpc_buffer(xprt) = newbuf; |
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428 | xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_ENCODE); |
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429 | victim->cache_xid = su->su_xid; |
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430 | victim->cache_proc = uc->uc_proc; |
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431 | victim->cache_vers = uc->uc_vers; |
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432 | victim->cache_prog = uc->uc_prog; |
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433 | victim->cache_addr = uc->uc_addr; |
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434 | loc = CACHE_LOC(xprt, victim->cache_xid); |
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435 | victim->cache_next = uc->uc_entries[loc]; |
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436 | uc->uc_entries[loc] = victim; |
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437 | uc->uc_fifo[uc->uc_nextvictim++] = victim; |
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438 | uc->uc_nextvictim %= uc->uc_size; |
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439 | } |
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440 | |
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441 | /* |
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442 | * Try to get an entry from the cache |
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443 | * return 1 if found, 0 if not found |
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444 | */ |
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445 | static int |
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446 | cache_get( |
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447 | SVCXPRT *xprt, |
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448 | struct rpc_msg *msg, |
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449 | char **replyp, |
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450 | u_long *replylenp) |
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451 | { |
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452 | u_int loc; |
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453 | register cache_ptr ent; |
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454 | register struct svcudp_data *su = su_data(xprt); |
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455 | register struct udp_cache *uc = (struct udp_cache *) su->su_cache; |
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456 | |
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457 | # define EQADDR(a1, a2) (memcmp(&a1, &a2, sizeof(a1)) == 0) |
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458 | |
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459 | loc = CACHE_LOC(xprt, su->su_xid); |
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460 | for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) { |
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461 | if (ent->cache_xid == su->su_xid && |
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462 | ent->cache_proc == uc->uc_proc && |
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463 | ent->cache_vers == uc->uc_vers && |
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464 | ent->cache_prog == uc->uc_prog && |
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465 | EQADDR(ent->cache_addr, uc->uc_addr)) { |
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466 | *replyp = ent->cache_reply; |
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467 | *replylenp = ent->cache_replylen; |
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468 | return(1); |
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469 | } |
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470 | } |
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471 | /* |
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472 | * Failed to find entry |
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473 | * Remember a few things so we can do a set later |
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474 | */ |
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475 | uc->uc_proc = msg->rm_call.cb_proc; |
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476 | uc->uc_vers = msg->rm_call.cb_vers; |
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477 | uc->uc_prog = msg->rm_call.cb_prog; |
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478 | uc->uc_addr = xprt->xp_raddr; |
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479 | return(0); |
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480 | } |
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