1 | /* |
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2 | * |
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3 | * Copyright (C) 1988, 1989 by the Massachusetts Institute of Technology |
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4 | * Developed by the MIT Student Information Processing Board (SIPB). |
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5 | * For copying information, see the file mit-copyright.h in this release. |
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6 | * |
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7 | */ |
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8 | /* |
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9 | * |
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10 | * rpcall.c -- Procedures to implement a simple (perhaps brain-asleep) RPC |
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11 | * protocol over a TCP connection. |
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12 | * This file handles the caller's side of the connection. |
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13 | * |
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14 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/discuss/libds/rpcall.c,v $ |
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15 | * $Header: /afs/dev.mit.edu/source/repository/athena/bin/discuss/libds/rpcall.c,v 1.15 1989-06-03 00:21:41 srz Exp $ |
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16 | * $Locker: $ |
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17 | * $Log: not supported by cvs2svn $ |
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18 | * Revision 1.14 89/06/03 00:12:42 srz |
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19 | * Ken's changes. |
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20 | * |
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21 | * Revision 1.13 89/01/04 20:36:24 raeburn |
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22 | * Fixed return type of open_rpc and case statement syntax; fixed |
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23 | * include paths. |
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24 | * |
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25 | * Revision 1.12 88/10/16 14:53:22 raeburn |
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26 | * Added function type definitions; handled different errors from |
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27 | * gethostbyname; moved static "panic" to top (to avoid implicit |
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28 | * declaration). |
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29 | * |
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30 | * Revision 1.11 88/10/16 14:03:54 raeburn |
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31 | * revised include format |
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32 | * |
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33 | * Revision 1.10 88/07/28 10:52:12 srz |
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34 | * Added better error message when can't exec subprocess. |
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35 | * |
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36 | * Revision 1.9 87/04/11 00:06:04 srz |
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37 | * Added RCS junk |
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38 | * |
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39 | * Revision 1.8 87/03/18 12:24:35 srz |
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40 | * Better handling of unknown rpc's. |
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41 | * |
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42 | * Revision 1.7 87/03/10 00:07:23 wesommer |
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43 | * Added cleanup routines and error exit path for open connection. |
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44 | * |
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45 | * Revision 1.6 87/03/09 23:52:18 spook |
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46 | * Removed some unused variables; added an error check. |
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47 | * |
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48 | * |
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49 | */ |
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50 | #ifndef lint |
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51 | static char rcsid_rpcall_c[] = |
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52 | "$Header: /afs/dev.mit.edu/source/repository/athena/bin/discuss/libds/rpcall.c,v 1.15 1989-06-03 00:21:41 srz Exp $"; |
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53 | #endif lint |
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54 | |
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55 | /* INCLUDES */ |
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56 | |
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57 | #include <sys/types.h> |
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58 | #include <stdio.h> |
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59 | #include <ctype.h> |
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60 | #include <strings.h> |
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61 | #include <sys/socket.h> |
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62 | #include <netinet/in.h> |
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63 | #include <netdb.h> |
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64 | #include <fcntl.h> |
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65 | #include <discuss/tfile.h> |
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66 | #include "rpc.h" |
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67 | #include "config.h" |
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68 | |
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69 | /* DEFINES */ |
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70 | |
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71 | #define min(A, B) ((A) < (B) ? (A) : (B)) |
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72 | #define SUCCESS 1 |
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73 | #define ERROR -1 |
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74 | |
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75 | /* EXTERNAL ROUTINES */ |
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76 | |
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77 | char *malloc(),*rindex(); |
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78 | extern int errno; |
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79 | |
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80 | int rpc_err; |
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81 | |
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82 | /* static variables and functions */ |
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83 | |
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84 | /* panic -- just a printf */ |
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85 | static void panic(str) |
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86 | char *str; |
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87 | { |
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88 | fprintf(stderr, "panic: %s\n", str); |
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89 | perror("discuss"); |
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90 | exit(1); |
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91 | } |
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92 | |
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93 | /* argument list info */ |
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94 | static int procno; /* procedure number */ |
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95 | |
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96 | /* connections & socket info */ |
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97 | static USPStream *us = NULL; |
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98 | |
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99 | /* |
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100 | * |
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101 | * startsend() -- Get ready for an RPC call. |
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102 | * |
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103 | */ |
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104 | void startsend(whichproc) |
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105 | int whichproc; |
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106 | { |
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107 | procno = whichproc; |
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108 | if (us == NULL) { |
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109 | rpc_err = RPC_NOT_INIT; |
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110 | return; |
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111 | } |
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112 | USP_begin_block(us,PROC_BASE+procno); |
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113 | rpc_err = 0; |
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114 | |
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115 | return; |
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116 | } |
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117 | |
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118 | /* |
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119 | * |
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120 | * sendint(i) -- Send an integer in an RPC call. |
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121 | * |
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122 | */ |
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123 | void sendint(i) |
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124 | int i; |
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125 | { |
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126 | if (USP_put_long_integer(us, i) != SUCCESS) { |
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127 | rpc_err = errno; |
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128 | } |
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129 | } |
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130 | /* |
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131 | * |
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132 | * sendshort(i) -- Send a short integer in an RPC call. |
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133 | * |
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134 | */ |
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135 | void sendshort(i) |
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136 | short i; |
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137 | { |
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138 | if (USP_put_integer(us, i) != SUCCESS) { |
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139 | rpc_err = errno; |
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140 | } |
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141 | } |
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142 | |
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143 | /* |
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144 | * |
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145 | * sendstr(i) -- Send a string in an RPC call. |
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146 | * |
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147 | */ |
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148 | void sendstr(str) |
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149 | char *str; |
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150 | { |
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151 | if (us == NULL) { |
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152 | rpc_err = RPC_NOT_INIT; |
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153 | return; |
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154 | } |
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155 | if (USP_put_string(us, str) != SUCCESS) { |
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156 | rpc_err = errno; |
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157 | } |
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158 | } |
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159 | |
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160 | /* |
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161 | * |
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162 | * sendbool(b) -- Send a boolean in an RPC call. |
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163 | * |
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164 | */ |
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165 | void sendbool(b) |
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166 | unsigned short b; |
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167 | { |
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168 | if (USP_put_boolean(us, b) != SUCCESS) { |
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169 | rpc_err = errno; |
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170 | } |
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171 | } |
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172 | |
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173 | |
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174 | /* |
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175 | * |
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176 | * sendfile(tf) -- Send a file in an RPC call. |
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177 | * |
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178 | */ |
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179 | void sendfile(tf) |
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180 | tfile tf; |
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181 | { |
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182 | int tfs; |
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183 | |
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184 | tfs = tfsize (tf); |
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185 | if (USP_put_long_integer(us, tfs) != SUCCESS) { |
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186 | rpc_err = errno; |
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187 | } |
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188 | } |
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189 | |
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190 | /* |
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191 | * |
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192 | * sendit () -- Make the final call. |
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193 | * |
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194 | */ |
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195 | void sendit(dest) |
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196 | char *dest; |
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197 | { |
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198 | if (USP_end_block(us) != SUCCESS) { |
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199 | rpc_err = errno; |
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200 | } |
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201 | return; |
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202 | } |
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203 | |
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204 | /* |
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205 | * |
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206 | * init_rpc () -- Initialize the RPC mechanism |
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207 | * |
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208 | */ |
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209 | void init_rpc () |
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210 | { |
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211 | init_rpc_err_tbl(); |
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212 | init_usp_err_tbl(); |
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213 | } |
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214 | |
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215 | /* |
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216 | * |
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217 | * term_rpc -- Shutdown the rpc mechanism |
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218 | * |
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219 | */ |
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220 | void term_rpc() |
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221 | { |
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222 | flush_convs (); |
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223 | return; |
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224 | } |
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225 | |
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226 | /* |
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227 | * |
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228 | * close_rpc () -- Close down a specific rpc conversation |
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229 | * |
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230 | */ |
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231 | void close_rpc(rc) |
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232 | rpc_conversation rc; |
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233 | { |
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234 | USP_close_connection(rc); |
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235 | us = NULL; |
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236 | return; |
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237 | } |
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238 | |
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239 | /* |
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240 | * |
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241 | * set_rpc () -- Sets the current rpc conversation |
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242 | * |
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243 | */ |
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244 | void set_rpc(rc) |
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245 | rpc_conversation rc; |
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246 | { |
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247 | us = rc; |
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248 | } |
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249 | |
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250 | /* |
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251 | * |
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252 | * open_rpc () -- Open the connection to the server |
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253 | * Returns an rpc conversation id. |
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254 | * |
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255 | */ |
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256 | rpc_conversation open_rpc (host, port_num, service_id, code) |
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257 | char *host; /* hostname to connect to */ |
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258 | int port_num; /* port number to use */ |
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259 | char *service_id; /* authenticator service id */ |
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260 | register int *code; /* return code */ |
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261 | { |
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262 | int parent,sv[2]; |
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263 | rpc_conversation conv; |
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264 | struct hostent *hp; |
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265 | int authl; |
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266 | register int i, s = -1; |
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267 | |
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268 | char *server_name,*authp; |
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269 | struct sockaddr_in address; |
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270 | |
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271 | *code = 0; |
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272 | |
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273 | if (service_id [0] == '/') { /* authenticate using sub-process */ |
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274 | if (socketpair(AF_UNIX,SOCK_STREAM,0,sv) < 0) |
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275 | panic ("can't do socket pair"); |
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276 | |
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277 | parent = fork (); |
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278 | if (parent < 0) |
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279 | panic ("Can't fork"); |
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280 | if (!parent) { /* child's play */ |
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281 | dup2(sv[1],0); /* child takes second one */ |
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282 | |
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283 | for (i = 3; i < 20; i++) |
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284 | (void) close (i); |
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285 | |
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286 | server_name = rindex (service_id, '/'); |
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287 | if (server_name == NULL) |
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288 | server_name = service_id; |
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289 | else |
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290 | server_name++; |
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291 | execl(service_id, server_name, 0); |
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292 | { |
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293 | char buf[100]; |
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294 | sprintf(buf, "Can't exec %s", service_id); |
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295 | panic (buf); |
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296 | } |
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297 | } else { |
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298 | (void) close (sv[1]); |
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299 | (void) fcntl (sv[0], F_SETFD, 1); |
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300 | us = USP_associate (sv[0]); |
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301 | return(us); |
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302 | } |
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303 | } |
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304 | |
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305 | hp = gethostbyname(host); |
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306 | if (hp == NULL) { |
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307 | extern int h_errno; |
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308 | int h = h_errno; |
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309 | switch (h) { |
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310 | case HOST_NOT_FOUND: |
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311 | *code = RPC_HOST_UNKNOWN; |
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312 | break; |
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313 | case TRY_AGAIN: |
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314 | *code = RPC_NS_TIMEOUT; |
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315 | break; |
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316 | case NO_RECOVERY: |
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317 | *code = RPC_NS_ERROR; |
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318 | break; |
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319 | case NO_ADDRESS: |
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320 | *code = RPC_NO_ADDR; |
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321 | break; |
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322 | default: |
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323 | *code = RPC_NS_ERROR; |
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324 | break; |
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325 | } |
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326 | return(NULL); |
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327 | } |
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328 | |
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329 | /* since we already have our port number, the following code was |
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330 | stolen from USP to manually set up the connection. Note that |
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331 | one benefit from using the primitive USP routine (USP_associate) |
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332 | is that we eliminate an extra host lookup, and we don't have |
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333 | to rely on USP's primitive error mechanism. Yeah! */ |
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334 | |
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335 | bzero((char *) &address, sizeof(address)); |
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336 | bcopy(hp->h_addr, (char *) &address.sin_addr, hp->h_length); |
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337 | address.sin_family = hp->h_addrtype; |
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338 | address.sin_port = port_num; |
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339 | if((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) |
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340 | goto punt; |
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341 | |
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342 | if(connect(s, (char *) &address, sizeof(address)) < 0) |
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343 | goto punt; |
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344 | |
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345 | (void) fcntl (s, F_SETFD, 1); |
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346 | conv = USP_associate (s); |
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347 | us = conv; |
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348 | if (!us) |
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349 | goto punt; |
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350 | |
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351 | get_authenticator(service_id, 0, &authp, &authl, code); |
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352 | if (! *code) { |
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353 | USP_begin_block(us,KRB_TICKET); |
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354 | sendshort(authl); |
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355 | for (i = 0; i < authl; i++) { |
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356 | sendshort(*authp++); |
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357 | } |
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358 | USP_end_block(us); |
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359 | } else { |
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360 | USP_begin_block(us,KRB_TICKET); /* send blank ticket */ |
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361 | sendshort(0); |
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362 | USP_end_block(us); |
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363 | } |
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364 | return(conv); |
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365 | punt: |
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366 | if (s >= 0) close(s); |
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367 | *code = errno; |
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368 | return(NULL); |
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369 | } |
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370 | |
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371 | /* |
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372 | * |
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373 | * recvreply () -- Routine to accept an RPC return. |
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374 | * |
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375 | */ |
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376 | void recvreply () |
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377 | { |
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378 | USPCardinal bt; |
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379 | |
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380 | if (USP_rcv_blk(us, &bt) != SUCCESS) { |
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381 | rpc_err = errno; |
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382 | return; |
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383 | } |
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384 | |
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385 | if (bt != REPLY_TYPE) { |
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386 | if (bt == UNKNOWN_CALL) |
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387 | rpc_err = RPC_UNIMPL_CALL; |
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388 | else |
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389 | rpc_err = RPC_PROTOCOL; |
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390 | USP_flush_block(us); |
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391 | } |
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392 | return; |
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393 | |
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394 | } |
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395 | |
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396 | int recvint () |
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397 | { |
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398 | USPLong_integer li; |
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399 | |
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400 | if (USP_get_long_integer(us, &li) != SUCCESS) { |
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401 | rpc_err = errno; |
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402 | return(0); |
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403 | } |
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404 | |
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405 | return (li); |
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406 | } |
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407 | |
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408 | /* |
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409 | * |
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410 | * recvstr () -- Receive a string from an RPC call |
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411 | * |
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412 | */ |
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413 | |
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414 | char *recvstr () |
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415 | { |
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416 | USPString str; |
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417 | |
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418 | if (USP_get_string(us, &str) != SUCCESS) { |
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419 | rpc_err = errno; |
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420 | return(""); |
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421 | } |
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422 | |
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423 | return (str); |
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424 | } |
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425 | unsigned short recvbool() |
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426 | { |
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427 | USPBoolean flag; |
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428 | |
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429 | if (USP_get_boolean(us, &flag) != SUCCESS) { |
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430 | rpc_err = errno; |
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431 | return(0); |
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432 | } |
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433 | |
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434 | return (flag); |
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435 | } |
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436 | |
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437 | /* |
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438 | * |
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439 | * senddata () -- Routine to send the contents of a transaction file |
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440 | * across the net. |
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441 | * |
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442 | */ |
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443 | void senddata(tf) |
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444 | tfile tf; |
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445 | { |
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446 | int tfs,tocopy; |
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447 | char buffer[508]; |
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448 | int result; |
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449 | |
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450 | topen (tf, "r", &result); |
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451 | USP_begin_block (us, TFILE_BLK); |
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452 | tfs = tfsize(tf); |
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453 | while (tfs > 0) { |
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454 | tocopy = min (tfs, 508); |
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455 | tread (tf, buffer, tocopy, &result); |
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456 | if (result) |
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457 | break; |
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458 | USP_put_byte_block(us, buffer, tocopy); |
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459 | tfs -= tocopy; |
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460 | } |
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461 | USP_end_block(us); |
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462 | tclose (tf, &result); |
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463 | } |
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464 | |
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465 | /* |
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466 | * |
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467 | * recvdata () -- Routine to receive a USP file. |
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468 | * |
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469 | */ |
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470 | void recvdata(tf) |
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471 | tfile tf; |
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472 | { |
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473 | char buffer[508]; |
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474 | USPCardinal bt; |
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475 | unsigned actual; |
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476 | int result; |
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477 | |
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478 | if (USP_rcv_blk(us, &bt) != SUCCESS) { |
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479 | rpc_err = errno; |
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480 | return; |
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481 | } |
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482 | |
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483 | if (bt != TFILE_BLK) { |
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484 | rpc_err = RPC_PROTOCOL; |
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485 | return; |
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486 | } |
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487 | |
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488 | topen (tf, "w", &result); |
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489 | if (result) goto done; |
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490 | for (;;) { |
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491 | if (USP_get_byte_block(us, buffer, 508, &actual) != SUCCESS) { |
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492 | rpc_err = errno; |
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493 | break; |
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494 | } |
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495 | if (actual == 0) |
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496 | break; |
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497 | twrite(tf, buffer, actual, &result); |
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498 | if (result) break; |
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499 | } |
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500 | |
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501 | tclose (tf, &result); |
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502 | |
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503 | done: |
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504 | USP_flush_block(us); |
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505 | } |
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