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