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428
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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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442
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18 /* HISTORY
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19 * 11-Nov-1990 bristor@simba
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428
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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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456
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32 #include "gnuserv.h"
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428
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33
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456
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34 char gnuserv_version[] = "gnuserv version" GNUSERV_VERSION;
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35
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428
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36
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37 #ifdef USE_LITOUT
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38 #ifdef linux
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39 #include <bsd/sgtty.h>
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40 #else
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41 #include <sgtty.h>
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42 #endif
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43 #endif
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44
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45 #ifdef AIX
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46 #include <sys/select.h>
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47 #endif
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48
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49 #include <stdlib.h>
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50 #include <stdio.h>
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51 #include <sys/types.h>
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52 #include <sys/stat.h>
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53
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54 #ifdef HAVE_UNISTD_H
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55 #include <unistd.h>
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56 #endif /* HAVE_UNISTD_H */
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57
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58 #ifdef HAVE_STRING_H
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59 #include <string.h>
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60 #endif /* HAVE_STRING_H */
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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 pid_t 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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82 void
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83 ipc_exit (int stat)
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84 {
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85 msgctl (ipc_qid,IPC_RMID,0);
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442
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86
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428
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87 if (ipc_wpid != 0)
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88 kill (ipc_wpid, SIGKILL);
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89
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90 exit (stat);
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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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97 void
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98 ipc_handle_signal(int sig)
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99 {
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100 ipc_exit (0);
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101 } /* ipc_handle_signal */
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102
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103
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442
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104 /*
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428
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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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108 void
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109 ipc_spawn_watchdog (void)
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110 {
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111 if ((ipc_wpid = fork ()) == 0)
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112 { /* child process */
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113 pid_t 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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116
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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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124
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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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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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135 void
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136 ipc_init (struct msgbuf **msgpp)
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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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141 sprintf (buf,"%s/gsrv%d",tmpdir,(int)geteuid ());
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142 creat (buf,0600);
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143 key = ftok (buf,1);
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144
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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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151
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152 ipc_spawn_watchdog ();
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153
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154 signal (SIGTERM,ipc_handle_signal);
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155 signal (SIGINT,ipc_handle_signal);
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156
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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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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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172 void
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173 handle_ipc_request (struct msgbuf *msgp)
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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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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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188
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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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191 buf[len] = '\0'; /* terminate */
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442
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192
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428
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193 printf ("%d %s", ipc_qid, buf);
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194 fflush (stdout);
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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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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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205 } /* if */
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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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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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442
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212 while (offset < (GSERV_BUFSZ-1) &&
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428
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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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218
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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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223 exit(1);
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224 }
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225
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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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238
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442
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239 /* Send this string off, but only if we have enough space */
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428
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240
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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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253 }
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254
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255 /* eat the newline */
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256 while ((len = read (0,buf,1)) == 0)
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257 ;
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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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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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274 if (msgsnd (ipc_qid,msgp,strlen(msgp->mtext)+1,0) < 0)
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275 perror ("msgsend(gnuserv)");
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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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442
|
293
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428
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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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|
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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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442
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311
|
|
428
|
312 } /* echo_request */
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313
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314
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|
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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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|
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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 = 0;
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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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442
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329 while (offset < GSERV_BUFSZ &&
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428
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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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|
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333 }
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334
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|
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335 if (len < 0) {
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336 perror(progname);
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|
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337 fprintf(stderr,"%s: unable to read\n",progname);
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|
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338 exit(1);
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|
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339 }
|
|
442
|
340
|
|
428
|
341 /* parse the response from emacs, getting client fd & result length */
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|
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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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|
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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;
|
|
|
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 ;
|
|
|
359 if (len < 0)
|
|
|
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 }
|
|
|
365 if (buf[0] != '\n')
|
|
|
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 }
|
|
|
370 /* send the newline */
|
|
|
371 buf[1] = '\0';
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|
|
372 send_string(s,buf);
|
|
442
|
373 close(s);
|
|
428
|
374
|
|
|
375 } /* handle_response */
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|
|
376 #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
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|
|
377
|
|
|
378
|
|
|
379 #ifdef INTERNET_DOMAIN_SOCKETS
|
|
|
380 struct entry {
|
|
458
|
381 unsigned long host_addr;
|
|
428
|
382 struct entry *next;
|
|
|
383 };
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|
|
384
|
|
|
385 struct entry *permitted_hosts[TABLE_SIZE];
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|
|
386
|
|
|
387 #ifdef AUTH_MAGIC_COOKIE
|
|
|
388 # include <X11/X.h>
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|
|
389 # include <X11/Xauth.h>
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|
|
390
|
|
|
391 static Xauth *server_xauth = NULL;
|
|
442
|
392 #endif
|
|
428
|
393
|
|
442
|
394 static int
|
|
428
|
395 timed_read (int fd, char *buf, int max, int timeout, int one_line)
|
|
|
396 {
|
|
|
397 fd_set rmask;
|
|
|
398 struct timeval tv; /* = {timeout, 0}; */
|
|
|
399 char c = 0;
|
|
|
400 int nbytes = 0;
|
|
|
401 int r;
|
|
442
|
402
|
|
428
|
403 tv.tv_sec = timeout;
|
|
|
404 tv.tv_usec = 0;
|
|
|
405
|
|
|
406 FD_ZERO(&rmask);
|
|
|
407 FD_SET(fd, &rmask);
|
|
442
|
408
|
|
428
|
409 do
|
|
|
410 {
|
|
|
411 r = select(fd + 1, &rmask, NULL, NULL, &tv);
|
|
|
412
|
|
|
413 if (r > 0)
|
|
|
414 {
|
|
|
415 if (read (fd, &c, 1) == 1 )
|
|
|
416 {
|
|
|
417 *buf++ = c;
|
|
|
418 ++nbytes;
|
|
|
419 }
|
|
|
420 else
|
|
|
421 {
|
|
|
422 printf ("read error on socket\004\n");
|
|
|
423 return -1;
|
|
|
424 }
|
|
|
425 }
|
|
|
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')));
|
|
|
437
|
|
|
438 --buf;
|
|
|
439 if (one_line && *buf == '\n')
|
|
|
440 {
|
|
|
441 *buf = 0;
|
|
|
442 }
|
|
|
443
|
|
|
444 return nbytes;
|
|
|
445 }
|
|
442
|
446
|
|
|
447
|
|
428
|
448
|
|
|
449 /*
|
|
|
450 permitted -- return whether a given host is allowed to connect to the server.
|
|
|
451 */
|
|
|
452 static int
|
|
458
|
453 permitted (unsigned long host_addr, int fd)
|
|
428
|
454 {
|
|
|
455 int key;
|
|
|
456 struct entry *entry;
|
|
|
457
|
|
442
|
458 char auth_protocol[128];
|
|
428
|
459 char buf[1024];
|
|
|
460 int auth_data_len;
|
|
|
461
|
|
|
462 if (fd > 0)
|
|
|
463 {
|
|
|
464 /* we are checking permission on a real connection */
|
|
|
465
|
|
|
466 /* Read auth protocol name */
|
|
442
|
467
|
|
428
|
468 if (timed_read(fd, auth_protocol, AUTH_NAMESZ, AUTH_TIMEOUT, 1) <= 0)
|
|
|
469 return FALSE;
|
|
|
470
|
|
|
471 if (strcmp (auth_protocol, DEFAUTH_NAME) &&
|
|
|
472 strcmp (auth_protocol, MCOOKIE_NAME))
|
|
|
473 {
|
|
442
|
474 printf ("authentication protocol (%s) from client is invalid...\n",
|
|
428
|
475 auth_protocol);
|
|
|
476 printf ("... Was the client an old version of gnuclient/gnudoit?\004\n");
|
|
442
|
477
|
|
428
|
478 return FALSE;
|
|
|
479 }
|
|
|
480
|
|
|
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
|
|
456
|
493 if (auth_data_len <= 0 || auth_data_len > sizeof(buf))
|
|
|
494 {
|
|
|
495 return FALSE;
|
|
|
496 }
|
|
|
497
|
|
428
|
498 if (timed_read(fd, buf, auth_data_len, AUTH_TIMEOUT, 0) != auth_data_len)
|
|
|
499 return FALSE;
|
|
442
|
500
|
|
428
|
501 #ifdef AUTH_MAGIC_COOKIE
|
|
456
|
502 if (server_xauth && server_xauth->data)
|
|
462
|
503 {
|
|
456
|
504 /* Do a compare without comprising info about
|
|
|
505 the size of the cookie */
|
|
460
|
506 int auth_data_pos;
|
|
|
507 int auth_mismatches =
|
|
456
|
508 ( auth_data_len ^
|
|
|
509 server_xauth->data_length );
|
|
|
510
|
|
|
511 for(auth_data_pos=0; auth_data_pos < auth_data_len; ++auth_data_pos)
|
|
|
512 auth_mismatches |=
|
|
|
513 ( buf[auth_data_pos] ^
|
|
|
514 server_xauth->data[auth_data_pos % server_xauth->data_length]);
|
|
|
515
|
|
|
516 if (auth_mismatches == 0)
|
|
428
|
517 return TRUE;
|
|
456
|
518
|
|
|
519 for(;rand() % 1000;);
|
|
462
|
520 }
|
|
456
|
521
|
|
442
|
522 #else
|
|
428
|
523 printf ("client tried Xauth, but server is not compiled with Xauth\n");
|
|
|
524 #endif
|
|
442
|
525
|
|
428
|
526 /*
|
|
|
527 * auth failed, but allow this to fall through to the GNU_SECURE
|
|
|
528 * protocol....
|
|
|
529 */
|
|
|
530
|
|
|
531 printf ("Xauth authentication failed, trying GNU_SECURE auth...\004\n");
|
|
|
532
|
|
|
533 }
|
|
442
|
534
|
|
428
|
535 /* Other auth protocols go here, and should execute only if the
|
|
|
536 * auth_protocol name matches.
|
|
|
537 */
|
|
|
538
|
|
|
539 }
|
|
|
540
|
|
|
541
|
|
|
542 /* Now, try the old GNU_SECURE stuff... */
|
|
442
|
543
|
|
428
|
544 /* First find the hash key */
|
|
|
545 key = HASH(host_addr) % TABLE_SIZE;
|
|
442
|
546
|
|
428
|
547 /* Now check the chain for that hash key */
|
|
|
548 for(entry=permitted_hosts[key]; entry != NULL; entry=entry->next)
|
|
442
|
549 if (host_addr == entry->host_addr)
|
|
428
|
550 return(TRUE);
|
|
442
|
551
|
|
428
|
552 return(FALSE);
|
|
|
553
|
|
|
554 } /* permitted */
|
|
|
555
|
|
|
556
|
|
442
|
557 /*
|
|
428
|
558 add_host -- add the given host to the list of permitted hosts, provided it isn't
|
|
|
559 already there.
|
|
442
|
560 */
|
|
428
|
561 static void
|
|
458
|
562 add_host (unsigned long host_addr)
|
|
428
|
563 {
|
|
|
564 int key;
|
|
|
565 struct entry *new_entry;
|
|
442
|
566
|
|
428
|
567 if (!permitted(host_addr, -1))
|
|
|
568 {
|
|
|
569 if ((new_entry = (struct entry *) malloc(sizeof(struct entry))) == NULL) {
|
|
|
570 fprintf(stderr,"%s: unable to malloc space for permitted host entry\n",
|
|
|
571 progname);
|
|
|
572 exit(1);
|
|
|
573 } /* if */
|
|
|
574
|
|
|
575 new_entry->host_addr = host_addr;
|
|
|
576 key = HASH(host_addr) % TABLE_SIZE;
|
|
|
577 new_entry->next = permitted_hosts[key];
|
|
|
578 permitted_hosts[key] = new_entry;
|
|
|
579 } /* if */
|
|
|
580
|
|
|
581 } /* add_host */
|
|
|
582
|
|
|
583
|
|
|
584 /*
|
|
|
585 setup_table -- initialize the table of hosts allowed to contact the server,
|
|
|
586 by reading from the file specified by the GNU_SECURE
|
|
|
587 environment variable
|
|
|
588 Put in the local machine, and, if a security file is specifed,
|
|
|
589 add each host that is named in the file.
|
|
|
590 Return the number of hosts added.
|
|
|
591 */
|
|
|
592 static int
|
|
|
593 setup_table (void)
|
|
|
594 {
|
|
|
595 FILE *host_file;
|
|
|
596 char *file_name;
|
|
|
597 char hostname[HOSTNAMSZ];
|
|
458
|
598 unsigned int host_addr;
|
|
428
|
599 int i, hosts=0;
|
|
442
|
600
|
|
428
|
601 /* Make sure every entry is null */
|
|
|
602 for (i=0; i<TABLE_SIZE; i++)
|
|
|
603 permitted_hosts[i] = NULL;
|
|
|
604
|
|
|
605 gethostname(hostname,HOSTNAMSZ);
|
|
|
606
|
|
|
607 if ((host_addr = internet_addr(hostname)) == -1)
|
|
|
608 {
|
|
442
|
609 fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP",
|
|
428
|
610 progname,hostname);
|
|
|
611 exit(1);
|
|
|
612 } /* if */
|
|
|
613
|
|
|
614 #ifdef AUTH_MAGIC_COOKIE
|
|
442
|
615
|
|
|
616 server_xauth = XauGetAuthByAddr (FamilyInternet,
|
|
428
|
617 sizeof(host_addr), (char *)&host_addr,
|
|
442
|
618 strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
|
|
428
|
619 strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
|
|
|
620 hosts++;
|
|
|
621
|
|
|
622 #endif /* AUTH_MAGIC_COOKIE */
|
|
442
|
623
|
|
428
|
624
|
|
|
625 #if 0 /* Don't even want to allow access from the local host by default */
|
|
|
626 add_host(host_addr); /* add local host */
|
|
442
|
627 #endif
|
|
428
|
628
|
|
|
629 if (((file_name = getenv("GNU_SECURE")) != NULL && /* security file */
|
|
|
630 (host_file = fopen(file_name,"r")) != NULL)) /* opened ok */
|
|
|
631 {
|
|
|
632 while ((fscanf(host_file,"%s",hostname) != EOF)) /* find a host */
|
|
|
633 if ((host_addr = internet_addr(hostname)) != -1)/* get its addr */
|
|
|
634 {
|
|
|
635 add_host(host_addr); /* add the addr */
|
|
|
636 hosts++;
|
|
|
637 }
|
|
|
638 fclose(host_file);
|
|
|
639 } /* if */
|
|
|
640
|
|
|
641 return hosts;
|
|
|
642 } /* setup_table */
|
|
|
643
|
|
|
644
|
|
|
645 /*
|
|
|
646 internet_init -- initialize server, returning an internet socket that can
|
|
|
647 be listened on.
|
|
|
648 */
|
|
|
649 static int
|
|
|
650 internet_init (void)
|
|
|
651 {
|
|
|
652 int ls; /* socket descriptor */
|
|
|
653 struct servent *sp; /* pointer to service information */
|
|
|
654 struct sockaddr_in server; /* for local socket address */
|
|
|
655 char *ptr; /* ptr to return from getenv */
|
|
|
656
|
|
442
|
657 if (setup_table() == 0)
|
|
428
|
658 return -1;
|
|
|
659
|
|
|
660 /* clear out address structure */
|
|
442
|
661 memset (&server, '\0', sizeof (server));
|
|
|
662
|
|
428
|
663 /* Set up address structure for the listen socket. */
|
|
|
664 server.sin_family = AF_INET;
|
|
|
665 server.sin_addr.s_addr = INADDR_ANY;
|
|
|
666
|
|
|
667 /* Find the information for the gnu server
|
|
|
668 * in order to get the needed port number.
|
|
|
669 */
|
|
|
670 if ((ptr=getenv("GNU_PORT")) != NULL)
|
|
|
671 server.sin_port = htons(atoi(ptr));
|
|
|
672 else if ((sp = getservbyname ("gnuserv", "tcp")) == NULL)
|
|
|
673 server.sin_port = htons(DEFAULT_PORT+getuid());
|
|
|
674 else
|
|
|
675 server.sin_port = sp->s_port;
|
|
442
|
676
|
|
428
|
677 /* Create the listen socket. */
|
|
|
678 if ((ls = socket (AF_INET,SOCK_STREAM, 0)) == -1)
|
|
|
679 {
|
|
|
680 perror(progname);
|
|
|
681 fprintf(stderr,"%s: unable to create socket\n",progname);
|
|
|
682 exit(1);
|
|
|
683 } /* if */
|
|
442
|
684
|
|
428
|
685 /* Bind the listen address to the socket. */
|
|
|
686 if (bind(ls,(struct sockaddr *) &server,sizeof(struct sockaddr_in)) == -1)
|
|
|
687 {
|
|
|
688 perror(progname);
|
|
|
689 fprintf(stderr,"%s: unable to bind socket\n",progname);
|
|
|
690 exit(1);
|
|
|
691 } /* if */
|
|
|
692
|
|
|
693 /* Initiate the listen on the socket so remote users
|
|
442
|
694 * can connect.
|
|
428
|
695 */
|
|
|
696 if (listen(ls,20) == -1)
|
|
|
697 {
|
|
|
698 perror(progname);
|
|
|
699 fprintf(stderr,"%s: unable to listen\n",progname);
|
|
|
700 exit(1);
|
|
|
701 } /* if */
|
|
|
702
|
|
|
703 return(ls);
|
|
|
704
|
|
|
705 } /* internet_init */
|
|
|
706
|
|
|
707
|
|
|
708 /*
|
|
|
709 handle_internet_request -- accept a request from a client and send the information
|
|
|
710 to stdout (the gnu process).
|
|
|
711 */
|
|
|
712 static void
|
|
|
713 handle_internet_request (int ls)
|
|
|
714 {
|
|
|
715 int s;
|
|
442
|
716 socklen_t addrlen = sizeof (struct sockaddr_in);
|
|
428
|
717 struct sockaddr_in peer; /* for peer socket address */
|
|
|
718
|
|
442
|
719 memset (&peer, '\0', sizeof (peer));
|
|
428
|
720
|
|
440
|
721 if ((s = accept(ls,(struct sockaddr *)&peer, &addrlen)) == -1)
|
|
428
|
722 {
|
|
|
723 perror(progname);
|
|
|
724 fprintf(stderr,"%s: unable to accept\n",progname);
|
|
|
725 exit(1);
|
|
|
726 } /* if */
|
|
442
|
727
|
|
428
|
728 /* Check that access is allowed - if not return crud to the client */
|
|
|
729 if (!permitted(peer.sin_addr.s_addr, s))
|
|
|
730 {
|
|
|
731 send_string(s,"gnudoit: Connection refused\ngnudoit: unable to connect to remote");
|
|
|
732 close(s);
|
|
|
733
|
|
|
734 printf("Refused connection from %s\004\n", inet_ntoa(peer.sin_addr));
|
|
|
735 return;
|
|
|
736 } /* if */
|
|
|
737
|
|
|
738 echo_request(s);
|
|
442
|
739
|
|
428
|
740 } /* handle_internet_request */
|
|
|
741 #endif /* INTERNET_DOMAIN_SOCKETS */
|
|
|
742
|
|
|
743
|
|
|
744 #ifdef UNIX_DOMAIN_SOCKETS
|
|
|
745 /*
|
|
|
746 unix_init -- initialize server, returning an unix-domain socket that can
|
|
|
747 be listened on.
|
|
|
748 */
|
|
|
749 static int
|
|
|
750 unix_init (void)
|
|
|
751 {
|
|
|
752 int ls; /* socket descriptor */
|
|
|
753 struct sockaddr_un server; /* unix socket address */
|
|
442
|
754 socklen_t bindlen;
|
|
428
|
755
|
|
|
756 if ((ls = socket(AF_UNIX,SOCK_STREAM, 0)) < 0)
|
|
|
757 {
|
|
|
758 perror(progname);
|
|
|
759 fprintf(stderr,"%s: unable to create socket\n",progname);
|
|
|
760 exit(1);
|
|
|
761 } /* if */
|
|
|
762
|
|
|
763 /* Set up address structure for the listen socket. */
|
|
|
764 #ifdef HIDE_UNIX_SOCKET
|
|
|
765 sprintf(server.sun_path,"%s/gsrvdir%d",tmpdir,(int)geteuid());
|
|
|
766 if (mkdir(server.sun_path, 0700) < 0)
|
|
|
767 {
|
|
|
768 /* assume it already exists, and try to set perms */
|
|
|
769 if (chmod(server.sun_path, 0700) < 0)
|
|
|
770 {
|
|
|
771 perror(progname);
|
|
|
772 fprintf(stderr,"%s: can't set permissions on %s\n",
|
|
|
773 progname, server.sun_path);
|
|
|
774 exit(1);
|
|
|
775 }
|
|
|
776 }
|
|
|
777 strcat(server.sun_path,"/gsrv");
|
|
|
778 unlink(server.sun_path); /* remove old file if it exists */
|
|
|
779 #else /* HIDE_UNIX_SOCKET */
|
|
|
780 sprintf(server.sun_path,"%s/gsrv%d",tmpdir,(int)geteuid());
|
|
|
781 unlink(server.sun_path); /* remove old file if it exists */
|
|
|
782 #endif /* HIDE_UNIX_SOCKET */
|
|
|
783
|
|
|
784 server.sun_family = AF_UNIX;
|
|
|
785 #ifdef HAVE_SOCKADDR_SUN_LEN
|
|
|
786 /* See W. R. Stevens "Advanced Programming in the Unix Environment"
|
|
|
787 p. 502 */
|
|
|
788 bindlen = (sizeof (server.sun_len) + sizeof (server.sun_family)
|
|
|
789 + strlen (server.sun_path) + 1);
|
|
|
790 server.sun_len = bindlen;
|
|
|
791 #else
|
|
|
792 bindlen = strlen (server.sun_path) + sizeof (server.sun_family);
|
|
|
793 #endif
|
|
442
|
794
|
|
428
|
795 if (bind(ls,(struct sockaddr *)&server,bindlen) < 0)
|
|
|
796 {
|
|
|
797 perror(progname);
|
|
|
798 fprintf(stderr,"%s: unable to bind socket\n",progname);
|
|
|
799 exit(1);
|
|
|
800 } /* if */
|
|
|
801
|
|
|
802 chmod(server.sun_path,0700); /* only this user can send commands */
|
|
|
803
|
|
|
804 if (listen(ls,20) < 0) {
|
|
|
805 perror(progname);
|
|
|
806 fprintf(stderr,"%s: unable to listen\n",progname);
|
|
|
807 exit(1);
|
|
|
808 } /* if */
|
|
|
809
|
|
|
810 /* #### there are also better ways of dealing with this when
|
|
|
811 sigvec() is present. */
|
|
|
812 #if defined (HAVE_SIGPROCMASK)
|
|
442
|
813 {
|
|
428
|
814 sigset_t _mask;
|
|
|
815 sigemptyset (&_mask);
|
|
|
816 sigaddset (&_mask, SIGPIPE);
|
|
|
817 sigprocmask (SIG_BLOCK, &_mask, NULL);
|
|
|
818 }
|
|
|
819 #else
|
|
|
820 signal(SIGPIPE,SIG_IGN); /* in case user kills client */
|
|
|
821 #endif
|
|
|
822
|
|
|
823 return(ls);
|
|
|
824
|
|
|
825 } /* unix_init */
|
|
|
826
|
|
|
827
|
|
|
828 /*
|
|
|
829 handle_unix_request -- accept a request from a client and send the information
|
|
|
830 to stdout (the gnu process).
|
|
|
831 */
|
|
|
832 static void
|
|
|
833 handle_unix_request (int ls)
|
|
|
834 {
|
|
|
835 int s;
|
|
442
|
836 socklen_t len = sizeof (struct sockaddr_un);
|
|
428
|
837 struct sockaddr_un server; /* for unix socket address */
|
|
|
838
|
|
|
839 server.sun_family = AF_UNIX;
|
|
|
840
|
|
440
|
841 if ((s = accept(ls,(struct sockaddr *)&server, &len)) < 0)
|
|
428
|
842 {
|
|
|
843 perror(progname);
|
|
|
844 fprintf(stderr,"%s: unable to accept\n",progname);
|
|
|
845 } /* if */
|
|
|
846
|
|
|
847 echo_request(s);
|
|
442
|
848
|
|
428
|
849 } /* handle_unix_request */
|
|
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850 #endif /* UNIX_DOMAIN_SOCKETS */
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851
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852
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853 int
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854 main (int argc, char *argv[])
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855 {
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856 int chan; /* temporary channel number */
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857 #ifdef SYSV_IPC
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858 struct msgbuf *msgp; /* message buffer */
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859 #else
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860 int ils = -1; /* internet domain listen socket */
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861 int uls = -1; /* unix domain listen socket */
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862 #endif /* SYSV_IPC */
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863
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864 progname = argv[0];
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865
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866 for(chan=3; chan < _NFILE; close(chan++)) /* close unwanted channels */
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867 ;
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868
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869 #ifdef USE_TMPDIR
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870 tmpdir = getenv("TMPDIR");
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871 #endif
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872 if (!tmpdir)
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873 tmpdir = "/tmp";
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874 #ifdef USE_LITOUT
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875 {
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876 /* this is to allow ^D to pass to emacs */
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877 int d = LLITOUT;
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878 (void) ioctl(fileno(stdout), TIOCLBIS, &d);
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879 }
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880 #endif
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881
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882 #ifdef SYSV_IPC
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883 ipc_init(&msgp); /* get a msqid to listen on, and a message buffer */
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884 #endif /* SYSV_IPC */
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885
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886 #ifdef INTERNET_DOMAIN_SOCKETS
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887 ils = internet_init(); /* get an internet domain socket to listen on */
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888 #endif /* INTERNET_DOMAIN_SOCKETS */
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889
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890 #ifdef UNIX_DOMAIN_SOCKETS
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891 uls = unix_init(); /* get a unix domain socket to listen on */
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892 #endif /* UNIX_DOMAIN_SOCKETS */
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893
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894 while (1) {
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895 #ifdef SYSV_IPC
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896 handle_ipc_request(msgp);
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897 #else /* NOT SYSV_IPC */
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898 fd_set rmask;
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899 FD_ZERO(&rmask);
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900 FD_SET(fileno(stdin), &rmask);
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901 if (uls >= 0)
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902 FD_SET(uls, &rmask);
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903 if (ils >= 0)
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904 FD_SET(ils, &rmask);
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442
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905
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906 if (select(max2(fileno(stdin),max2(uls,ils)) + 1, &rmask,
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428
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907 (fd_set *)NULL, (fd_set *)NULL, (struct timeval *)NULL) < 0)
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908 {
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909 perror(progname);
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910 fprintf(stderr,"%s: unable to select\n",progname);
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442
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911 return 1;
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428
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912 } /* if */
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913
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914 #ifdef UNIX_DOMAIN_SOCKETS
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915 if (uls > 0 && FD_ISSET(uls, &rmask))
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916 handle_unix_request(uls);
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917 #endif
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918
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919 #ifdef INTERNET_DOMAIN_SOCKETS
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920 if (ils > 0 && FD_ISSET(ils, &rmask))
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921 handle_internet_request(ils);
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922 #endif /* INTERNET_DOMAIN_SOCKETS */
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923
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924 if (FD_ISSET(fileno(stdin), &rmask)) /* from stdin (gnu process) */
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925 handle_response();
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926 #endif /* NOT SYSV_IPC */
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442
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927 } /* while (1) */
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428
|
928 } /* main */
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929
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930 #endif /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */
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