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1 /* -*-C-*-
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2 Common library code for the GNU Emacs server and client.
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3
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4 This file is part of GNU Emacs.
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5
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6 Copying is permitted under those conditions described by the GNU
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7 General Public License.
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8
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9 Copyright (C) 1989 Free Software Foundation, Inc.
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10
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11 Author: Andy Norman (ange@hplb.hpl.hp.com), based on
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12 'etc/server.c' and 'etc/emacsclient.c' from the 18.52 GNU
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13 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: gnuslib.c,v 2.4 95/02/16 11:57:37 arup alpha !";
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34 #endif
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35
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207
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36 #include "gnuserv.h"
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108
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37 #include <errno.h>
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0
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38
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39 #ifdef SYSV_IPC
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40 static int connect_to_ipc_server (void);
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41 #endif
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42 #ifdef UNIX_DOMAIN_SOCKETS
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43 static int connect_to_unix_server (void);
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44 #endif
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45 #ifdef INTERNET_DOMAIN_SOCKETS
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46 static int connect_to_internet_server (char *serverhost, u_short port);
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47 #endif
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48
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49 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
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50 #ifdef HAVE_BROKEN_INET_ADDR
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51 # define IN_ADDR struct in_addr
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52 # define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
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53 #else
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54 # if (LONGBITS > 32)
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55 # define IN_ADDR unsigned int
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56 # else
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57 # define IN_ADDR unsigned long
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58 # endif
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59 # define NUMERIC_ADDR_ERROR (numeric_addr == (IN_ADDR) -1)
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60 #endif
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61
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62 #include <stdlib.h>
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63 #include <stdio.h>
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64 #include <sys/types.h>
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65 #include <sys/stat.h>
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149
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66 #ifdef HAVE_UNISTD_H
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0
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67 #include <unistd.h>
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149
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68 #endif /* HAVE_UNISTD_H */
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69 #ifdef HAVE_STRING_H
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70 #include <string.h>
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149
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71 #endif /* HAVE_STRING_H */
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0
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72
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73 #include <arpa/inet.h>
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74
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75 char *progname = NULL;
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76
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77 int make_connection(hostarg, portarg, s)
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78 char *hostarg;
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79 int portarg;
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80 int *s;
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81 {
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82 #ifdef INTERNET_DOMAIN_SOCKETS
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83 char *ptr;
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84 if (hostarg == NULL)
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85 hostarg = getenv("GNU_HOST");
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86 if (portarg == 0 && (ptr=getenv("GNU_PORT")) != NULL)
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87 portarg = atoi(ptr);
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88 #endif
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89
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90 if (hostarg != NULL) {
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91 /* hostname was given explicitly, via cmd line arg or GNU_HOST,
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92 * so obey it. */
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93 #ifdef UNIX_DOMAIN_SOCKETS
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94 if (!strcmp(hostarg, "unix")) {
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95 *s = connect_to_unix_server();
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96 return (int) CONN_UNIX;
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97 }
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98 #endif /* UNIX_DOMAIN_SOCKETS */
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99 #ifdef INTERNET_DOMAIN_SOCKETS
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100 *s = connect_to_internet_server(hostarg, portarg);
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101 return (int) CONN_INTERNET;
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102 #endif
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103 #ifdef SYSV_IPC
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104 return -1; /* hostarg should always be NULL for SYSV_IPC */
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105 #endif
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106 } else {
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107 /* no hostname given. Use unix-domain/sysv-ipc, or
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108 * internet-domain connection to local host if they're not available. */
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155
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109 #if defined(UNIX_DOMAIN_SOCKETS)
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110 *s = connect_to_unix_server();
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111 return (int) CONN_UNIX;
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155
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112 #elif defined(SYSV_IPC)
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113 *s = connect_to_ipc_server();
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114 return (int) CONN_IPC;
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155
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115 #elif defined(INTERNET_DOMAIN_SOCKETS)
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175
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116 {
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117 char localhost[HOSTNAMSZ];
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118 gethostname(localhost,HOSTNAMSZ); /* use this host by default */
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119 *s = connect_to_internet_server(localhost, portarg);
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120 return (int) CONN_INTERNET;
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121 }
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155
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122 #endif /* IPC type */
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0
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123 }
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124 }
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125
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126 #ifdef SYSV_IPC
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127 /*
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128 connect_to_ipc_server -- establish connection with server process via SYSV IPC
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129 Returns msqid for server if successful.
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130 */
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131 static int connect_to_ipc_server (void)
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132 {
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133 int s; /* connected msqid */
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134 key_t key; /* message key */
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135 char buf[GSERV_BUFSZ+1]; /* buffer for filename */
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136
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137 sprintf(buf,"/tmp/gsrv%d",(int)geteuid());
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138 creat(buf,0600);
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139 if ((key = ftok(buf,1)) == -1) {
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140 perror(progname);
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141 fprintf(stderr, "%s: unable to get ipc key from %s\n",
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142 progname, buf);
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143 exit(1);
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144 }
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145
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146 if ((s = msgget(key,0600)) == -1) {
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147 perror(progname);
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148 fprintf(stderr,"%s: unable to access msg queue\n",progname);
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149 exit(1);
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150 }; /* if */
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151
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152 return(s);
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153
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154 } /* connect_to_ipc_server */
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155
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156
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157 /*
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158 disconnect_from_ipc_server -- inform the server that sending has finished,
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159 and wait for its reply.
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160 */
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161 void disconnect_from_ipc_server(s,msgp,echo)
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162 int s;
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163 struct msgbuf *msgp;
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164 int echo;
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165 {
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166 int len; /* length of received message */
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167
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168 send_string(s,EOT_STR); /* EOT terminates this message */
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169 msgp->mtype = 1;
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170
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171 if(msgsnd(s,msgp,strlen(msgp->mtext)+1,0) < 0) {
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172 perror(progname);
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173 fprintf(stderr,"%s: unable to send message to server\n",progname);
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174 exit(1);
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175 }; /* if */
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176
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177 if((len = msgrcv(s,msgp,GSERV_BUFSZ,getpid(),0)) < 0) {
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178 perror(progname);
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179 fprintf(stderr,"%s: unable to receive message from server\n",progname);
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180 exit(1);
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181 }; /* if */
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182
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183 if (echo) {
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184 msgp->mtext[len] = '\0'; /* string terminate message */
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185 fputs(msgp->mtext, stdout);
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186 if (msgp->mtext[len-1] != '\n') putchar ('\n');
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187 }; /* if */
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188
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189 } /* disconnect_from_ipc_server */
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190 #endif /* SYSV_IPC */
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191
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192
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193 #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
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194 /*
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195 send_string -- send string to socket.
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196 */
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197 void send_string(s,msg)
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198 int s;
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199 CONST char *msg;
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200 {
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201 #if 0
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202 if (send(s,msg,strlen(msg),0) < 0) {
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203 perror(progname);
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204 fprintf(stderr,"%s: unable to send\n",progname);
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205 exit(1);
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206 }; /* if */
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207 #else
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208 int len, left=strlen(msg);
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209 while (left > 0) {
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210 if ((len=write(s,msg,min2(left,GSERV_BUFSZ))) < 0) {
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211 /* XEmacs addition: robertl@arnet.com */
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212 if (errno == EPIPE) {
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213 return ;
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214 }
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215 perror(progname);
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216 fprintf(stderr,"%s: unable to send\n",progname);
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217 exit(1);
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218 }; /* if */
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219 left -= len;
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220 msg += len;
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221 }; /* while */
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222 #endif
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223 } /* send_string */
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108
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224
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225 /*
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226 read_line -- read a \n terminated line from a socket
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227 */
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171
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228 int read_line(int s, char *dest)
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108
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229 {
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230 int length;
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231 int offset=0;
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232 char buffer[GSERV_BUFSZ+1];
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233
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234 while ((length=read(s,buffer+offset,1)>0) && buffer[offset]!='\n'
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235 && buffer[offset] != EOT_CHR) {
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236 offset += length;
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237 if (offset >= GSERV_BUFSZ)
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238 break;
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239 }
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240 buffer[offset] = '\0';
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241 strcpy(dest,buffer);
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242 return 1;
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243 } /* read_line */
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0
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244 #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
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245
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246
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247 #ifdef UNIX_DOMAIN_SOCKETS
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248 /*
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249 connect_to_unix_server -- establish connection with server process via a unix-
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250 domain socket. Returns socket descriptor for server
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251 if successful.
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252 */
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253 static int connect_to_unix_server (void)
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254 {
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255 int s; /* connected socket descriptor */
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256 struct sockaddr_un server; /* for unix connections */
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257
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258 if ((s = socket(AF_UNIX,SOCK_STREAM,0)) < 0) {
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259 perror(progname);
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260 fprintf(stderr,"%s: unable to create socket\n",progname);
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261 exit(1);
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262 }; /* if */
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263
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264 server.sun_family = AF_UNIX;
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265 #ifdef HIDE_UNIX_SOCKET
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266 sprintf(server.sun_path,"/tmp/gsrvdir%d/gsrv",(int)geteuid());
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267 #else /* HIDE_UNIX_SOCKET */
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268 sprintf(server.sun_path,"/tmp/gsrv%d",(int)geteuid());
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269 #endif /* HIDE_UNIX_SOCKET */
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270 if (connect(s,(struct sockaddr *)&server,strlen(server.sun_path)+2) < 0) {
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271 perror(progname);
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272 fprintf(stderr,"%s: unable to connect to local\n",progname);
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273 exit(1);
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274 }; /* if */
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275
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276 return(s);
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277
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278 } /* connect_to_unix_server */
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279 #endif /* UNIX_DOMAIN_SOCKETS */
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280
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281
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282 #ifdef INTERNET_DOMAIN_SOCKETS
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283 /*
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284 internet_addr -- return the internet addr of the hostname or
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285 internet address passed. Return -1 on error.
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286 */
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287 int internet_addr(host)
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288 char *host;
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289 {
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290 struct hostent *hp; /* pointer to host info for remote host */
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291 IN_ADDR numeric_addr; /* host address */
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292
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293 numeric_addr = inet_addr(host);
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294 if (!NUMERIC_ADDR_ERROR)
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295 return numeric_addr;
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296 else if ((hp = gethostbyname(host)) != NULL)
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297 return ((struct in_addr *)(hp->h_addr))->s_addr;
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298 else
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299 return -1;
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300
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301 } /* internet_addr */
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302
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303 #ifdef AUTH_MAGIC_COOKIE
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304 # include <X11/X.h>
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305 # include <X11/Xauth.h>
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306
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307 static Xauth *server_xauth = NULL;
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308 #endif
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309
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310 /*
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311 connect_to_internet_server -- establish connection with server process via
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312 an internet domain socket. Returns socket
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313 descriptor for server if successful.
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314 */
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315 static int connect_to_internet_server (char *serverhost, u_short port)
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316 {
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317 int s; /* connected socket descriptor */
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318 struct servent *sp; /* pointer to service information */
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319 struct sockaddr_in peeraddr_in; /* for peer socket address */
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320 char buf[512]; /* temporary buffer */
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321
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322 /* clear out address structures */
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323 memset((char *)&peeraddr_in,0,sizeof(struct sockaddr_in));
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324
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325 /* Set up the peer address to which we will connect. */
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326 peeraddr_in.sin_family = AF_INET;
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327
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328 /* look up the server host's internet address */
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329 if ((peeraddr_in.sin_addr.s_addr = internet_addr(serverhost)) == -1) {
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330 fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP\n",
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331 progname,serverhost);
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332 exit(1);
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333 }; /* if */
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334
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335 if (port == 0) {
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336 if ((sp = getservbyname ("gnuserv","tcp")) == NULL)
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337 peeraddr_in.sin_port = htons(DEFAULT_PORT+getuid());
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338 else
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339 peeraddr_in.sin_port = sp->s_port;
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340 } /* if */
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341 else
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342 peeraddr_in.sin_port = htons(port);
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343
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344 /* Create the socket. */
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345 if ((s = socket (AF_INET,SOCK_STREAM, 0))== -1) {
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346 perror(progname);
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347 fprintf(stderr,"%s: unable to create socket\n",progname);
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348 exit(1);
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349 }; /* if */
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350
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351 /* Try to connect to the remote server at the address
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352 * which was just built into peeraddr.
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353 */
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354 if (connect(s, (struct sockaddr *)&peeraddr_in,
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355 sizeof(struct sockaddr_in)) == -1) {
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356 perror(progname);
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357 fprintf(stderr, "%s: unable to connect to remote\n",progname);
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358 exit(1);
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359 }; /* if */
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360
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361 #ifdef AUTH_MAGIC_COOKIE
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362
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363 /* send credentials using MIT-MAGIC-COOKIE-1 protocol */
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364
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365 server_xauth =
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366 XauGetAuthByAddr(FamilyInternet,
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367 sizeof(peeraddr_in.sin_addr.s_addr),
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368 (char *) &peeraddr_in.sin_addr.s_addr,
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369 strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
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370 strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
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371
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372 if (server_xauth && server_xauth->data) {
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373 sprintf(buf, "%s\n%d\n", MCOOKIE_NAME, server_xauth->data_length);
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374 write (s, buf, strlen(buf));
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375 write (s, server_xauth->data, server_xauth->data_length);
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376
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377 return (s);
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378 }
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379
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380 #endif /* AUTH_MAGIC_COOKIE */
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381
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382 sprintf (buf, "%s\n", DEFAUTH_NAME);
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383 write (s, buf, strlen(buf));
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384
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385 return(s);
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386
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387 } /* connect_to_internet_server */
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388 #endif /* INTERNET_DOMAIN_SOCKETS */
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389
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390
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391 #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
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392 /*
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393 disconnect_from_server -- inform the server that sending has finished, and wait for
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394 its reply.
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395 */
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396 void disconnect_from_server(s,echo)
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397 int s;
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398 int echo;
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399 {
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400 #if 0
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401 char buffer[REPLYSIZ+1];
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402 #else
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403 char buffer[GSERV_BUFSZ+1];
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404 #endif
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405 int add_newline = 1;
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406 int length;
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407
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408 send_string(s,EOT_STR); /* make sure server gets string */
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409
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410 #if !defined (linux) && !defined (_SCO_DS)
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411 /*
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412 * shutdown is completely hozed under linux. If s is a unix domain socket,
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413 * you'll get EOPNOTSUPP back from it. If s is an internet socket, you get
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414 * a broken pipe when you try to read a bit later. The latter
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415 * problem is fixed for linux versions >= 1.1.46, but the problem
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416 * with unix sockets persists. Sigh.
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417 */
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418
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419 if (shutdown(s,1) == -1) {
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420 perror(progname);
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421 fprintf(stderr, "%s: unable to shutdown socket\n",progname);
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422 exit(1);
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423 }; /* if */
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424 #endif
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425
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426 #if 0
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427 while((length = recv(s,buffer,REPLYSIZ,0)) > 0) {
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428 buffer[length] = '\0';
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429 if (echo) fputs(buffer,stdout);
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430 add_newline = (buffer[length-1] != '\n');
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431 }; /* while */
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432 #else
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108
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433 while ((length = read(s,buffer,GSERV_BUFSZ)) > 0 ||
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434 (length == -1 && errno == EINTR)) {
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435 if (length) {
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436 buffer[length] = '\0';
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437 if (echo) {
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438 fputs(buffer,stdout);
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439 add_newline = (buffer[length-1] != '\n');
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440 }; /* if */
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0
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441 }; /* if */
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442 }; /* while */
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443 #endif
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444
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445 if (echo && add_newline) putchar('\n');
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446
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447 if(length < 0) {
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448 perror(progname);
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449 fprintf(stderr,"%s: unable to read the reply from the server\n",progname);
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450 exit(1);
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451 }; /* if */
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452
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453 } /* disconnect_from_server */
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454 #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
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