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