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0
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1 /* -*-C-*-
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2 Server code for handling requests from clients and forwarding them
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3 on to the GNU Emacs process.
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4
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5 This file is part of GNU Emacs.
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6
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7 Copying is permitted under those conditions described by the GNU
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8 General Public License.
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9
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10 Copyright (C) 1989 Free Software Foundation, Inc.
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11
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12 Author: Andy Norman (ange@hplb.hpl.hp.com), based on 'etc/server.c'
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13 from the 18.52 GNU Emacs distribution.
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14
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15 Please mail bugs and suggestions to the author at the above address.
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16 */
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17
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18 /* HISTORY
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19 * 11-Nov-1990 bristor@simba
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20 * Added EOT stuff.
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21 */
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22
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23 /*
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24 * This file incorporates new features added by Bob Weiner <weiner@mot.com>,
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25 * Darrell Kindred <dkindred@cmu.edu> and Arup Mukherjee <arup@cmu.edu>.
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26 * Please see the note at the end of the README file for details.
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27 *
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28 * (If gnuserv came bundled with your emacs, the README file is probably
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29 * ../etc/gnuserv.README relative to the directory containing this file)
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30 */
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31
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32 #if 0
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33 static char rcsid [] = "!Header: gnuserv.c,v 2.1 95/02/16 11:58:27 arup alpha !";
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34 #endif
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35
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36 #include "gnuserv.h"
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37
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38 #ifdef USE_LITOUT
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39 #ifdef linux
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40 #include <bsd/sgtty.h>
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41 #else
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42 #include <sgtty.h>
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43 #endif
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44 #endif
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45
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46 #ifdef AIX
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47 #include <sys/select.h>
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48 #endif
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49
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50 #include <stdlib.h>
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51 #include <stdio.h>
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52 #include <sys/types.h>
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53 #include <sys/stat.h>
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149
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54
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55 #ifdef HAVE_UNISTD_H
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0
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56 #include <unistd.h>
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149
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57 #endif /* HAVE_UNISTD_H */
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171
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58
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149
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59 #ifdef HAVE_STRING_H
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0
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60 #include <string.h>
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149
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61 #endif /* HAVE_STRING_H */
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0
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62
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63 #if !defined(SYSV_IPC) && !defined(UNIX_DOMAIN_SOCKETS) && \
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64 !defined(INTERNET_DOMAIN_SOCKETS)
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65 main ()
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66 {
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67 fprintf (stderr,"Sorry, the Emacs server is only supported on systems that have\n");
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68 fprintf (stderr,"Unix Domain sockets, Internet Domain sockets or System V IPC\n");
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69 exit (1);
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70 } /* main */
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71 #else /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */
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72
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73 #ifdef SYSV_IPC
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74
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75 int ipc_qid = 0; /* ipc message queue id */
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76 int ipc_wpid = 0; /* watchdog task pid */
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77
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78
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79 /*
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80 ipc_exit -- clean up the queue id and queue, then kill the watchdog task
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81 if it exists. exit with the given status.
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82 */
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149
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83 void
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84 ipc_exit (int stat)
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0
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85 {
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149
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86 msgctl (ipc_qid,IPC_RMID,0);
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0
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87
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149
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88 if (ipc_wpid != 0)
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89 kill (ipc_wpid, SIGKILL);
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0
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90
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149
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91 exit (stat);
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0
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92 } /* ipc_exit */
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93
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94
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95 /*
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96 ipc_handle_signal -- catch the signal given and clean up.
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97 */
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149
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98 void
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99 ipc_handle_signal(int sig)
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0
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100 {
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149
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101 ipc_exit (0);
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0
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102 } /* ipc_handle_signal */
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103
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104
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105 /*
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106 ipc_spawn_watchdog -- spawn a watchdog task to clean up the message queue should the
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107 server process die.
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108 */
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149
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109 void
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110 ipc_spawn_watchdog (void)
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0
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111 {
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149
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112 if ((ipc_wpid = fork ()) == 0)
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113 { /* child process */
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114 int ppid = getppid (); /* parent's process id */
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115
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116 setpgrp(); /* gnu kills process group on exit */
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0
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117
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149
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118 while (1)
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119 {
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120 if (kill (ppid, 0) < 0) /* ppid is no longer valid, parent
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121 may have died */
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122 {
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123 ipc_exit (0);
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124 } /* if */
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0
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125
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149
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126 sleep(10); /* have another go later */
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127 } /* while */
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128 } /* if */
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0
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129
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130 } /* ipc_spawn_watchdog */
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131
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132
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133 /*
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134 ipc_init -- initialize server, setting the global msqid that can be listened on.
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135 */
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149
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136 void
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137 ipc_init (struct msgbuf **msgpp)
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0
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138 {
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139 key_t key; /* messge key */
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140 char buf[GSERV_BUFSZ]; /* pathname for key */
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141
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149
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142 sprintf (buf,"/tmp/gsrv%d",(int)geteuid ());
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143 creat (buf,0600);
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144 key = ftok (buf,1);
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0
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145
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149
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146 if ((ipc_qid = msgget (key,0600|IPC_CREAT)) == -1)
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147 {
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148 perror (progname);
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149 fprintf (stderr, "%s: unable to create msg queue\n", progname);
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150 ipc_exit (1);
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151 } /* if */
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0
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152
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149
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153 ipc_spawn_watchdog ();
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0
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154
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149
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155 signal (SIGTERM,ipc_handle_signal);
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156 signal (SIGINT,ipc_handle_signal);
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0
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157
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149
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158 if ((*msgpp = (struct msgbuf *)
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159 malloc (sizeof **msgpp + GSERV_BUFSZ)) == NULL)
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160 {
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161 fprintf (stderr,
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162 "%s: unable to allocate space for message buffer\n", progname);
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163 ipc_exit(1);
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164 } /* if */
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0
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165 } /* ipc_init */
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166
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167
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168 /*
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169 handle_ipc_request -- accept a request from a client, pass the request on
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170 to the GNU Emacs process, then wait for its reply and
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171 pass that on to the client.
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172 */
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149
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173 void
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174 handle_ipc_request (struct msgbuf *msgp)
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0
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175 {
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176 struct msqid_ds msg_st; /* message status */
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177 char buf[GSERV_BUFSZ];
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178 int len; /* length of message / read */
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179 int s, result_len; /* tag fields on the response from emacs */
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180 int offset = 0;
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181 int total = 1; /* # bytes that will actually be sent off */
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182
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149
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183 if ((len = msgrcv (ipc_qid, msgp, GSERV_BUFSZ - 1, 1, 0)) < 0)
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184 {
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185 perror (progname);
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186 fprintf (stderr, "%s: unable to receive\n", progname);
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187 ipc_exit (1);
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188 } /* if */
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0
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189
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149
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190 msgctl (ipc_qid, IPC_STAT, &msg_st);
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191 strncpy (buf, msgp->mtext, len);
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0
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192 buf[len] = '\0'; /* terminate */
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193
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149
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194 printf ("%d %s", ipc_qid, buf);
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195 fflush (stdout);
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0
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196
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197 /* now for the response from gnu */
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198 msgp->mtext[0] = '\0';
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199
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200 #if 0
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149
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201 if ((len = read(0,buf,GSERV_BUFSZ-1)) < 0)
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202 {
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203 perror (progname);
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204 fprintf (stderr, "%s: unable to read\n", progname);
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205 ipc_exit (1);
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0
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206 } /* if */
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149
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207
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208 sscanf (buf, "%d:%[^\n]\n", &junk, msgp->mtext);
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209 #else
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0
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210
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211 /* read in "n/m:" (n=client fd, m=message length) */
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212
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213 while (offset < (GSERV_BUFSZ-1) &&
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149
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214 ((len = read (0, buf + offset, 1)) > 0) &&
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215 buf[offset] != ':')
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216 {
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217 offset += len;
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218 }
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0
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219
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149
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220 if (len < 0)
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221 {
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222 perror (progname);
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223 fprintf (stderr, "%s: unable to read\n", progname);
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0
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224 exit(1);
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225 }
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226
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149
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227 /* parse the response from emacs, getting client fd & result length */
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228 buf[offset] = '\0';
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229 sscanf (buf, "%d/%d", &s, &result_len);
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230
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231 while (result_len > 0)
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232 {
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233 if ((len = read(0, buf, min2 (result_len, GSERV_BUFSZ - 1))) < 0)
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234 {
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235 perror (progname);
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236 fprintf (stderr, "%s: unable to read\n", progname);
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237 exit (1);
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238 }
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0
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239
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149
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240 /* Send this string off, but only if we have enough space */
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0
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241
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149
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242 if (GSERV_BUFSZ > total)
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243 {
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244 if (total + len <= GSERV_BUFSZ)
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245 buf[len] = 0;
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246 else
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247 buf[GSERV_BUFSZ - total] = 0;
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248
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249 send_string(s,buf);
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250 total += strlen(buf);
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251 }
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252
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253 result_len -= len;
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0
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254 }
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255
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256 /* eat the newline */
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149
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257 while ((len = read (0,buf,1)) == 0)
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0
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258 ;
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149
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259 if (len < 0)
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260 {
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261 perror(progname);
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262 fprintf (stderr,"%s: unable to read\n", progname);
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263 exit (1);
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264 }
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265 if (buf[0] != '\n')
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266 {
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267 fprintf (stderr,"%s: garbage after result [%c]\n", progname, buf[0]);
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268 exit (1);
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269 }
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0
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270 #endif
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271
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272 /* Send a response back to the client. */
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273
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274 msgp->mtype = msg_st.msg_lspid;
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149
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275 if (msgsnd (ipc_qid,msgp,strlen(msgp->mtext)+1,0) < 0)
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276 perror ("msgsend(gnuserv)");
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0
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277
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278 } /* handle_ipc_request */
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279 #endif /* SYSV_IPC */
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280
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281
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282 #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
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283 /*
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284 echo_request -- read request from a given socket descriptor, and send the information
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285 to stdout (the gnu process).
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286 */
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287 static void
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288 echo_request (int s)
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289 {
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290 char buf[GSERV_BUFSZ];
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291 int len;
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292
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293 printf("%d ",s);
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294
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295 /* read until we get a newline or no characters */
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296 while ((len = recv(s,buf,GSERV_BUFSZ-1,0)) > 0) {
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297 buf[len] = '\0';
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298 printf("%s",buf);
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299
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300 if (buf[len-1] == EOT_CHR) {
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301 fflush(stdout);
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302 break; /* end of message */
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303 }
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304
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305 } /* while */
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306
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307 if (len < 0) {
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308 perror(progname);
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309 fprintf(stderr,"%s: unable to recv\n",progname);
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310 exit(1);
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311 } /* if */
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312
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313 } /* echo_request */
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314
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315
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316 /*
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317 handle_response -- accept a response from stdin (the gnu process) and pass the
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318 information on to the relevant client.
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319 */
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320 static void
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321 handle_response (void)
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322 {
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323 char buf[GSERV_BUFSZ+1];
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324 int offset=0;
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325 int s;
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326 int len;
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327 int result_len;
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328
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329 /* read in "n/m:" (n=client fd, m=message length) */
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330 while (offset < GSERV_BUFSZ &&
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331 ((len = read(0,buf+offset,1)) > 0) &&
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332 buf[offset] != ':') {
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333 offset += len;
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334 }
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335
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336 if (len < 0) {
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337 perror(progname);
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338 fprintf(stderr,"%s: unable to read\n",progname);
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339 exit(1);
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340 }
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341
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342 /* parse the response from emacs, getting client fd & result length */
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343 buf[offset] = '\0';
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344 sscanf(buf,"%d/%d", &s, &result_len);
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345
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346 while (result_len > 0) {
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347 if ((len = read(0,buf,min2(result_len,GSERV_BUFSZ))) < 0) {
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348 perror(progname);
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349 fprintf(stderr,"%s: unable to read\n",progname);
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350 exit(1);
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351 }
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352 buf[len] = '\0';
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353 send_string(s,buf);
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354 result_len -= len;
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355 }
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356
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357 /* eat the newline */
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358 while ((len = read(0,buf,1)) == 0)
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359 ;
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149
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360 if (len < 0)
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361 {
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362 perror(progname);
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363 fprintf(stderr,"%s: unable to read\n",progname);
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364 exit(1);
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365 }
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366 if (buf[0] != '\n')
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367 {
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368 fprintf(stderr,"%s: garbage after result\n",progname);
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369 exit(1);
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370 }
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108
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371 /* send the newline */
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372 buf[1] = '\0';
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373 send_string(s,buf);
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374 close(s);
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0
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375
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376 } /* handle_response */
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377 #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
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378
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379
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380 #ifdef INTERNET_DOMAIN_SOCKETS
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381 struct entry {
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382 u_long host_addr;
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383 struct entry *next;
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384 };
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385
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386 struct entry *permitted_hosts[TABLE_SIZE];
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387
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388 #ifdef AUTH_MAGIC_COOKIE
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389 # include <X11/X.h>
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390 # include <X11/Xauth.h>
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391
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392 static Xauth *server_xauth = NULL;
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393 #endif
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394
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395 static int
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396 timed_read (int fd, char *buf, int max, int timeout, int one_line)
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397 {
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398 fd_set rmask;
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399 struct timeval tv; /* = {timeout, 0}; */
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400 char c = 0;
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401 int nbytes = 0;
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402 int r;
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403
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404 tv.tv_sec = timeout;
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405 tv.tv_usec = 0;
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406
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407 FD_ZERO(&rmask);
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408 FD_SET(fd, &rmask);
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409
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149
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410 do
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411 {
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412 r = select(fd + 1, &rmask, NULL, NULL, &tv);
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0
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413
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149
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414 if (r > 0)
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415 {
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416 if (read (fd, &c, 1) == 1 )
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417 {
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418 *buf++ = c;
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419 ++nbytes;
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420 }
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421 else
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422 {
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423 printf ("read error on socket\004\n");
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424 return -1;
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|
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425 }
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|
|
426 }
|
|
|
427 else if (r == 0)
|
|
|
428 {
|
|
|
429 printf ("read timed out\004\n");
|
|
|
430 return -1;
|
|
|
431 }
|
|
|
432 else
|
|
|
433 {
|
|
|
434 printf ("error in select\004\n");
|
|
|
435 return -1;
|
|
|
436 }
|
|
|
437 } while ((nbytes < max) && !(one_line && (c == '\n')));
|
|
0
|
438
|
|
|
439 --buf;
|
|
149
|
440 if (one_line && *buf == '\n')
|
|
|
441 {
|
|
|
442 *buf = 0;
|
|
|
443 }
|
|
0
|
444
|
|
|
445 return nbytes;
|
|
|
446 }
|
|
|
447
|
|
|
448
|
|
|
449
|
|
|
450 /*
|
|
|
451 permitted -- return whether a given host is allowed to connect to the server.
|
|
|
452 */
|
|
|
453 static int
|
|
|
454 permitted (u_long host_addr, int fd)
|
|
|
455 {
|
|
|
456 int key;
|
|
|
457 struct entry *entry;
|
|
|
458
|
|
|
459 char auth_protocol[128];
|
|
|
460 char buf[1024];
|
|
|
461 int auth_data_len;
|
|
|
462
|
|
149
|
463 if (fd > 0)
|
|
|
464 {
|
|
|
465 /* we are checking permission on a real connection */
|
|
0
|
466
|
|
149
|
467 /* Read auth protocol name */
|
|
|
468
|
|
|
469 if (timed_read(fd, auth_protocol, AUTH_NAMESZ, AUTH_TIMEOUT, 1) <= 0)
|
|
0
|
470 return FALSE;
|
|
|
471
|
|
149
|
472 if (strcmp (auth_protocol, DEFAUTH_NAME) &&
|
|
|
473 strcmp (auth_protocol, MCOOKIE_NAME))
|
|
|
474 {
|
|
|
475 printf ("authentication protocol (%s) from client is invalid...\n",
|
|
|
476 auth_protocol);
|
|
|
477 printf ("... Was the client an old version of gnuclient/gnudoit?\004\n");
|
|
|
478
|
|
|
479 return FALSE;
|
|
|
480 }
|
|
0
|
481
|
|
149
|
482 if (!strcmp(auth_protocol, MCOOKIE_NAME))
|
|
|
483 {
|
|
|
484
|
|
|
485 /*
|
|
|
486 * doing magic cookie auth
|
|
|
487 */
|
|
|
488
|
|
|
489 if (timed_read(fd, buf, 10, AUTH_TIMEOUT, 1) <= 0)
|
|
|
490 return FALSE;
|
|
|
491
|
|
|
492 auth_data_len = atoi(buf);
|
|
|
493
|
|
|
494 if (timed_read(fd, buf, auth_data_len, AUTH_TIMEOUT, 0) != auth_data_len)
|
|
|
495 return FALSE;
|
|
0
|
496
|
|
|
497 #ifdef AUTH_MAGIC_COOKIE
|
|
149
|
498 if (server_xauth && server_xauth->data &&
|
|
|
499 !memcmp(buf, server_xauth->data, auth_data_len))
|
|
|
500 {
|
|
|
501 return TRUE;
|
|
|
502 }
|
|
0
|
503 #else
|
|
149
|
504 printf ("client tried Xauth, but server is not compiled with Xauth\n");
|
|
0
|
505 #endif
|
|
|
506
|
|
|
507 /*
|
|
|
508 * auth failed, but allow this to fall through to the GNU_SECURE
|
|
|
509 * protocol....
|
|
|
510 */
|
|
|
511
|
|
149
|
512 printf ("Xauth authentication failed, trying GNU_SECURE auth...\004\n");
|
|
|
513
|
|
|
514 }
|
|
|
515
|
|
|
516 /* Other auth protocols go here, and should execute only if the
|
|
|
517 * auth_protocol name matches.
|
|
|
518 */
|
|
0
|
519
|
|
|
520 }
|
|
|
521
|
|
|
522
|
|
|
523 /* Now, try the old GNU_SECURE stuff... */
|
|
|
524
|
|
|
525 /* First find the hash key */
|
|
|
526 key = HASH(host_addr) % TABLE_SIZE;
|
|
|
527
|
|
|
528 /* Now check the chain for that hash key */
|
|
|
529 for(entry=permitted_hosts[key]; entry != NULL; entry=entry->next)
|
|
|
530 if (host_addr == entry->host_addr)
|
|
|
531 return(TRUE);
|
|
|
532
|
|
|
533 return(FALSE);
|
|
|
534
|
|
|
535 } /* permitted */
|
|
|
536
|
|
|
537
|
|
|
538 /*
|
|
|
539 add_host -- add the given host to the list of permitted hosts, provided it isn't
|
|
|
540 already there.
|
|
|
541 */
|
|
|
542 static void
|
|
|
543 add_host (u_long host_addr)
|
|
|
544 {
|
|
|
545 int key;
|
|
|
546 struct entry *new_entry;
|
|
|
547
|
|
149
|
548 if (!permitted(host_addr, -1))
|
|
|
549 {
|
|
|
550 if ((new_entry = (struct entry *) malloc(sizeof(struct entry))) == NULL) {
|
|
|
551 fprintf(stderr,"%s: unable to malloc space for permitted host entry\n",
|
|
|
552 progname);
|
|
|
553 exit(1);
|
|
|
554 } /* if */
|
|
|
555
|
|
|
556 new_entry->host_addr = host_addr;
|
|
|
557 key = HASH(host_addr) % TABLE_SIZE;
|
|
|
558 new_entry->next = permitted_hosts[key];
|
|
|
559 permitted_hosts[key] = new_entry;
|
|
0
|
560 } /* if */
|
|
|
561
|
|
|
562 } /* add_host */
|
|
|
563
|
|
|
564
|
|
|
565 /*
|
|
|
566 setup_table -- initialise the table of hosts allowed to contact the server,
|
|
|
567 by reading from the file specified by the GNU_SECURE
|
|
|
568 environment variable
|
|
|
569 Put in the local machine, and, if a security file is specifed,
|
|
|
570 add each host that is named in the file.
|
|
|
571 Return the number of hosts added.
|
|
|
572 */
|
|
|
573 static int
|
|
|
574 setup_table (void)
|
|
|
575 {
|
|
|
576 FILE *host_file;
|
|
|
577 char *file_name;
|
|
|
578 char hostname[HOSTNAMSZ];
|
|
|
579 u_int host_addr;
|
|
|
580 int i, hosts=0;
|
|
|
581
|
|
|
582 /* Make sure every entry is null */
|
|
|
583 for (i=0; i<TABLE_SIZE; i++)
|
|
|
584 permitted_hosts[i] = NULL;
|
|
|
585
|
|
|
586 gethostname(hostname,HOSTNAMSZ);
|
|
|
587
|
|
149
|
588 if ((host_addr = internet_addr(hostname)) == -1)
|
|
|
589 {
|
|
|
590 fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP",
|
|
|
591 progname,hostname);
|
|
|
592 exit(1);
|
|
|
593 } /* if */
|
|
0
|
594
|
|
|
595 #ifdef AUTH_MAGIC_COOKIE
|
|
|
596
|
|
|
597 server_xauth = XauGetAuthByAddr (FamilyInternet,
|
|
|
598 sizeof(host_addr), (char *)&host_addr,
|
|
|
599 strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
|
|
|
600 strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
|
|
|
601 hosts++;
|
|
|
602
|
|
|
603 #endif /* AUTH_MAGIC_COOKIE */
|
|
|
604
|
|
|
605
|
|
|
606 #if 0 /* Don't even want to allow access from the local host by default */
|
|
|
607 add_host(host_addr); /* add local host */
|
|
|
608 #endif
|
|
|
609
|
|
|
610 if (((file_name = getenv("GNU_SECURE")) != NULL && /* security file */
|
|
149
|
611 (host_file = fopen(file_name,"r")) != NULL)) /* opened ok */
|
|
|
612 {
|
|
|
613 while ((fscanf(host_file,"%s",hostname) != EOF)) /* find a host */
|
|
|
614 if ((host_addr = internet_addr(hostname)) != -1)/* get its addr */
|
|
|
615 {
|
|
|
616 add_host(host_addr); /* add the addr */
|
|
|
617 hosts++;
|
|
|
618 }
|
|
|
619 fclose(host_file);
|
|
|
620 } /* if */
|
|
0
|
621
|
|
|
622 return hosts;
|
|
|
623 } /* setup_table */
|
|
|
624
|
|
|
625
|
|
|
626 /*
|
|
|
627 internet_init -- initialize server, returning an internet socket that can
|
|
|
628 be listened on.
|
|
|
629 */
|
|
|
630 static int
|
|
|
631 internet_init (void)
|
|
|
632 {
|
|
|
633 int ls; /* socket descriptor */
|
|
|
634 struct servent *sp; /* pointer to service information */
|
|
|
635 struct sockaddr_in server; /* for local socket address */
|
|
|
636 char *ptr; /* ptr to return from getenv */
|
|
|
637
|
|
|
638 if (setup_table() == 0)
|
|
|
639 return -1;
|
|
|
640
|
|
|
641 /* clear out address structure */
|
|
|
642 memset((char *)&server,0,sizeof(struct sockaddr_in));
|
|
|
643
|
|
|
644 /* Set up address structure for the listen socket. */
|
|
|
645 server.sin_family = AF_INET;
|
|
|
646 server.sin_addr.s_addr = INADDR_ANY;
|
|
|
647
|
|
|
648 /* Find the information for the gnu server
|
|
|
649 * in order to get the needed port number.
|
|
|
650 */
|
|
|
651 if ((ptr=getenv("GNU_PORT")) != NULL)
|
|
|
652 server.sin_port = htons(atoi(ptr));
|
|
|
653 else if ((sp = getservbyname ("gnuserv", "tcp")) == NULL)
|
|
|
654 server.sin_port = htons(DEFAULT_PORT+getuid());
|
|
|
655 else
|
|
|
656 server.sin_port = sp->s_port;
|
|
|
657
|
|
|
658 /* Create the listen socket. */
|
|
149
|
659 if ((ls = socket (AF_INET,SOCK_STREAM, 0)) == -1)
|
|
|
660 {
|
|
|
661 perror(progname);
|
|
|
662 fprintf(stderr,"%s: unable to create socket\n",progname);
|
|
|
663 exit(1);
|
|
|
664 } /* if */
|
|
0
|
665
|
|
|
666 /* Bind the listen address to the socket. */
|
|
149
|
667 if (bind(ls,(struct sockaddr *) &server,sizeof(struct sockaddr_in)) == -1)
|
|
|
668 {
|
|
|
669 perror(progname);
|
|
|
670 fprintf(stderr,"%s: unable to bind socket\n",progname);
|
|
|
671 exit(1);
|
|
|
672 } /* if */
|
|
0
|
673
|
|
|
674 /* Initiate the listen on the socket so remote users
|
|
|
675 * can connect.
|
|
|
676 */
|
|
149
|
677 if (listen(ls,20) == -1)
|
|
|
678 {
|
|
|
679 perror(progname);
|
|
|
680 fprintf(stderr,"%s: unable to listen\n",progname);
|
|
|
681 exit(1);
|
|
|
682 } /* if */
|
|
0
|
683
|
|
|
684 return(ls);
|
|
|
685
|
|
|
686 } /* internet_init */
|
|
|
687
|
|
|
688
|
|
|
689 /*
|
|
|
690 handle_internet_request -- accept a request from a client and send the information
|
|
|
691 to stdout (the gnu process).
|
|
|
692 */
|
|
|
693 static void
|
|
|
694 handle_internet_request (int ls)
|
|
|
695 {
|
|
|
696 int s;
|
|
163
|
697 size_t addrlen = sizeof(struct sockaddr_in);
|
|
0
|
698 struct sockaddr_in peer; /* for peer socket address */
|
|
|
699
|
|
|
700 memset((char *)&peer,0,sizeof(struct sockaddr_in));
|
|
|
701
|
|
163
|
702 if ((s = accept(ls,(struct sockaddr *)&peer, (void *) &addrlen)) == -1)
|
|
149
|
703 {
|
|
|
704 perror(progname);
|
|
|
705 fprintf(stderr,"%s: unable to accept\n",progname);
|
|
|
706 exit(1);
|
|
|
707 } /* if */
|
|
0
|
708
|
|
|
709 /* Check that access is allowed - if not return crud to the client */
|
|
149
|
710 if (!permitted(peer.sin_addr.s_addr, s))
|
|
|
711 {
|
|
|
712 send_string(s,"gnudoit: Connection refused\ngnudoit: unable to connect to remote");
|
|
|
713 close(s);
|
|
0
|
714
|
|
149
|
715 printf("Refused connection from %s\004\n", inet_ntoa(peer.sin_addr));
|
|
|
716 return;
|
|
|
717 } /* if */
|
|
0
|
718
|
|
|
719 echo_request(s);
|
|
|
720
|
|
|
721 } /* handle_internet_request */
|
|
|
722 #endif /* INTERNET_DOMAIN_SOCKETS */
|
|
|
723
|
|
|
724
|
|
|
725 #ifdef UNIX_DOMAIN_SOCKETS
|
|
|
726 /*
|
|
|
727 unix_init -- initialize server, returning an unix-domain socket that can
|
|
|
728 be listened on.
|
|
|
729 */
|
|
|
730 static int
|
|
|
731 unix_init (void)
|
|
|
732 {
|
|
|
733 int ls; /* socket descriptor */
|
|
|
734 struct sockaddr_un server; /* unix socket address */
|
|
|
735 int bindlen;
|
|
|
736
|
|
149
|
737 if ((ls = socket(AF_UNIX,SOCK_STREAM, 0)) < 0)
|
|
|
738 {
|
|
|
739 perror(progname);
|
|
|
740 fprintf(stderr,"%s: unable to create socket\n",progname);
|
|
|
741 exit(1);
|
|
|
742 } /* if */
|
|
0
|
743
|
|
|
744 /* Set up address structure for the listen socket. */
|
|
|
745 #ifdef HIDE_UNIX_SOCKET
|
|
|
746 sprintf(server.sun_path,"/tmp/gsrvdir%d",(int)geteuid());
|
|
149
|
747 if (mkdir(server.sun_path, 0700) < 0)
|
|
|
748 {
|
|
|
749 /* assume it already exists, and try to set perms */
|
|
|
750 if (chmod(server.sun_path, 0700) < 0)
|
|
|
751 {
|
|
|
752 perror(progname);
|
|
|
753 fprintf(stderr,"%s: can't set permissions on %s\n",
|
|
|
754 progname, server.sun_path);
|
|
|
755 exit(1);
|
|
|
756 }
|
|
0
|
757 }
|
|
|
758 strcat(server.sun_path,"/gsrv");
|
|
|
759 unlink(server.sun_path); /* remove old file if it exists */
|
|
|
760 #else /* HIDE_UNIX_SOCKET */
|
|
|
761 sprintf(server.sun_path,"/tmp/gsrv%d",(int)geteuid());
|
|
|
762 unlink(server.sun_path); /* remove old file if it exists */
|
|
|
763 #endif /* HIDE_UNIX_SOCKET */
|
|
|
764
|
|
|
765 server.sun_family = AF_UNIX;
|
|
|
766 #ifdef HAVE_SOCKADDR_SUN_LEN
|
|
|
767 /* See W. R. Stevens "Advanced Programming in the Unix Environment"
|
|
|
768 p. 502 */
|
|
|
769 bindlen = (sizeof (server.sun_len) + sizeof (server.sun_family)
|
|
|
770 + strlen (server.sun_path) + 1);
|
|
|
771 server.sun_len = bindlen;
|
|
|
772 #else
|
|
|
773 bindlen = strlen (server.sun_path) + sizeof (server.sun_family);
|
|
|
774 #endif
|
|
|
775
|
|
149
|
776 if (bind(ls,(struct sockaddr *)&server,bindlen) < 0)
|
|
|
777 {
|
|
|
778 perror(progname);
|
|
|
779 fprintf(stderr,"%s: unable to bind socket\n",progname);
|
|
|
780 exit(1);
|
|
|
781 } /* if */
|
|
0
|
782
|
|
|
783 chmod(server.sun_path,0700); /* only this user can send commands */
|
|
|
784
|
|
|
785 if (listen(ls,20) < 0) {
|
|
|
786 perror(progname);
|
|
|
787 fprintf(stderr,"%s: unable to listen\n",progname);
|
|
|
788 exit(1);
|
|
|
789 } /* if */
|
|
|
790
|
|
|
791 /* #### there are also better ways of dealing with this when
|
|
|
792 sigvec() is present. */
|
|
|
793 #if defined (HAVE_SIGPROCMASK)
|
|
|
794 {
|
|
|
795 sigset_t _mask;
|
|
|
796 sigemptyset (&_mask);
|
|
|
797 sigaddset (&_mask, SIGPIPE);
|
|
|
798 sigprocmask (SIG_BLOCK, &_mask, NULL);
|
|
|
799 }
|
|
|
800 #else
|
|
|
801 signal(SIGPIPE,SIG_IGN); /* in case user kills client */
|
|
|
802 #endif
|
|
|
803
|
|
|
804 return(ls);
|
|
|
805
|
|
|
806 } /* unix_init */
|
|
|
807
|
|
|
808
|
|
|
809 /*
|
|
|
810 handle_unix_request -- accept a request from a client and send the information
|
|
|
811 to stdout (the gnu process).
|
|
|
812 */
|
|
|
813 static void
|
|
|
814 handle_unix_request (int ls)
|
|
|
815 {
|
|
|
816 int s;
|
|
163
|
817 size_t len = sizeof(struct sockaddr_un);
|
|
0
|
818 struct sockaddr_un server; /* for unix socket address */
|
|
|
819
|
|
|
820 server.sun_family = AF_UNIX;
|
|
|
821
|
|
163
|
822 if ((s = accept(ls,(struct sockaddr *)&server, (void *)&len)) < 0)
|
|
149
|
823 {
|
|
|
824 perror(progname);
|
|
|
825 fprintf(stderr,"%s: unable to accept\n",progname);
|
|
|
826 } /* if */
|
|
0
|
827
|
|
|
828 echo_request(s);
|
|
|
829
|
|
|
830 } /* handle_unix_request */
|
|
|
831 #endif /* UNIX_DOMAIN_SOCKETS */
|
|
|
832
|
|
|
833
|
|
|
834 void
|
|
|
835 main(argc,argv)
|
|
|
836 int argc;
|
|
|
837 char *argv[];
|
|
|
838 {
|
|
|
839 int chan; /* temporary channel number */
|
|
|
840 #ifdef INTERNET_DOMAIN_SOCKETS
|
|
|
841 int ils = -1; /* internet domain listen socket */
|
|
|
842 #endif
|
|
|
843 #ifdef UNIX_DOMAIN_SOCKETS
|
|
|
844 int uls = -1; /* unix domain listen socket */
|
|
|
845 #endif
|
|
|
846 #ifdef SYSV_IPC
|
|
|
847 struct msgbuf *msgp; /* message buffer */
|
|
|
848 #endif /* SYSV_IPC */
|
|
|
849
|
|
|
850 progname = argv[0];
|
|
|
851
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852 for(chan=3; chan < _NFILE; close(chan++)) /* close unwanted channels */
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853 ;
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854
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855 #ifdef USE_LITOUT
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856 {
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857 /* this is to allow ^D to pass to emacs */
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858 int d = LLITOUT;
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859 (void) ioctl(fileno(stdout), TIOCLBIS, &d);
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860 }
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861 #endif
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862
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863 #ifdef SYSV_IPC
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864 ipc_init(&msgp); /* get a msqid to listen on, and a message buffer */
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865 #endif /* SYSV_IPC */
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866
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867 #ifdef INTERNET_DOMAIN_SOCKETS
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868 ils = internet_init(); /* get a internet domain socket to listen on */
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869 #endif /* INTERNET_DOMAIN_SOCKETS */
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870
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871 #ifdef UNIX_DOMAIN_SOCKETS
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872 uls = unix_init(); /* get a unix domain socket to listen on */
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873 #endif /* UNIX_DOMAIN_SOCKETS */
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874
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875 while (1) {
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876 #ifdef SYSV_IPC
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877 handle_ipc_request(msgp);
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878 #else /* NOT SYSV_IPC */
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879 fd_set rmask;
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880 FD_ZERO(&rmask);
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881 FD_SET(fileno(stdin), &rmask);
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882 if (uls >= 0)
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883 FD_SET(uls, &rmask);
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884 if (ils >= 0)
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885 FD_SET(ils, &rmask);
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886
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887 if (select(max2(fileno(stdin),max2(uls,ils)) + 1, &rmask,
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149
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888 (fd_set *)NULL, (fd_set *)NULL, (struct timeval *)NULL) < 0)
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889 {
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890 perror(progname);
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891 fprintf(stderr,"%s: unable to select\n",progname);
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892 exit(1);
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893 } /* if */
|
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0
|
894
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895 #ifdef UNIX_DOMAIN_SOCKETS
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896 if (uls > 0 && FD_ISSET(uls, &rmask))
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897 handle_unix_request(uls);
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898 #endif
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899
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900 #ifdef INTERNET_DOMAIN_SOCKETS
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901 if (ils > 0 && FD_ISSET(ils, &rmask))
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902 handle_internet_request(ils);
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903 #endif /* INTERNET_DOMAIN_SOCKETS */
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904
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905 if (FD_ISSET(fileno(stdin), &rmask)) /* from stdin (gnu process) */
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906 handle_response();
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907 #endif /* NOT SYSV_IPC */
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908 } /* while */
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|
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909
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910 } /* main */
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911
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|
|
912 #endif /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */
|
