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4
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1 /*--------------------------------------------------------------------------
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2 NETREK II -- Paradise
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3
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4 Permission to use, copy, modify, and distribute this software and its
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5 documentation, or any derivative works thereof, for any NON-COMMERCIAL
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6 purpose and without fee is hereby granted, provided that this copyright
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7 notice appear in all copies. No representations are made about the
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8 suitability of this software for any purpose. This software is provided
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9 "as is" without express or implied warranty.
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10
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11 Xtrek Copyright 1986 Chris Guthrie
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12 Netrek (Xtrek II) Copyright 1989 Kevin P. Smith
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13 Scott Silvey
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14 Paradise II (Netrek II) Copyright 1993 Larry Denys
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15 Kurt Olsen
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16 Brandon Gillespie
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17 --------------------------------------------------------------------------*/
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18
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19 /*------------------------------------------------------------------------
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20 Startup program for netrek. Listens for connections, then forks off
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21 servers. Based on code written by Brett McCoy, but heavily modified.
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22
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23 Note that descriptor 2 is duped to descriptor 1, so that stdout and
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24 stderr go to the same file.
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25 --------------------------------------------------------------------------*/
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26
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27 #ifndef apollo
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28 #include <unistd.h>
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29 #endif
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30 #include <sys/types.h>
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31 #include <sys/time.h>
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32 #include <sys/socket.h>
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33 #include <sys/ioctl.h>
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34 #include <sys/stat.h>
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35 #include <sys/wait.h>
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36 #ifdef SVR4
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37 #include <sys/termios.h>
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38 #endif /* SVR4 */
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39 #include <netdb.h>
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40 #include <errno.h>
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41 #include <time.h>
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42 #include <netinet/in.h>
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43 #include <fcntl.h>
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44 #include <varargs.h>
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45 #include <stdio.h>
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46 #include <stdlib.h>
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47 #include <signal.h>
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48 #include <string.h>
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49 #ifdef SYSV
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50 #include <fcntl.h>
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51 #endif
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52 #ifdef hpux
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53 #include <sys/ptyio.h>
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54 #endif
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55 #include "defs.h"
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56 #include "path.h"
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57 #include "data.h"
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58
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59 /* #define DEF_PORT 2592 /* port to listen on */
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60 /*
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61 * #define NTSERV "bin/ntserv"
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62 *
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63 * #define METASERVER "metaserver.ecst.csuchico.edu"
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64 */
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65 /*
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66 * Since the metaserver address is a nameserver alias, we can't just compare
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67 * the peer hostname with the setting of METASERVER. The peer hostname
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68 * returned by gethostbyaddr() will be the machine's real name, which will be
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69 * different (and could change).
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70 *
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71 * So, we'll do a gethostbyname() on METASERVER to get an IP address, then we
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72 * can compare that with the connecting peer.
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73 *
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74 * It'd be overkill to get the metaserver's IP address with every connection;
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75 * and it may be inadequate to get it just once at startup, since listen can
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76 * exist for long periods of time, and the metaserver's IP address could be
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77 * changed in that time.
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78 *
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79 * So, we'll grab the IP address at least every META_UPDATE_TIME seconds
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80 */
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81 #define META_UPDATE_TIME (5*60*60) /* five hours */
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82
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83 void printlistenUsage();
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84 void set_env();
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85 int listenSock;
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86 short port = PORT;
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87 char *program;
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88 int meta_addr;
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89
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90 char *dateTime();
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91 void detach();
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92 void getConnections();
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93 void getListenSock();
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94 void multClose();
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95 void reaper();
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96 void terminate();
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97
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98 /*
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99 * Error reporting functions ripped from my library.
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100 */
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101 void syserr();
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102 void warnerr();
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103 void fatlerr();
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104 void err();
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105 char *lasterr();
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106 void print_pid();
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107
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108 struct hostent *gethostbyaddr();
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109 char *inet_ntoa();
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110 int metaserverflag;
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111 char *leagueflag = 0;
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112 char *observerflag = 0;
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113
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114 #define NEA 10
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115 char *extraargs[NEA];
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116 int extraargc = 0;
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117
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118 char *ntserv_binary = NTSERV;
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119
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120 /*
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121 * the System-V signal() function provides the older, unreliable signal
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122 * semantics. So, this is an implementation of signal using sigaction.
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123 */
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124
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125 void (*
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126 r_signal(sig, func)) ()
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127 int sig;
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128 void (*func) ();
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129 {
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130 struct sigaction act, oact;
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131
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132 act.sa_handler = func;
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133
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134 sigemptyset(&act.sa_mask);
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135 act.sa_flags = 0;
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136 #ifdef SA_RESTART
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137 act.sa_flags |= SA_RESTART;
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138 #endif
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139
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140 if (sigaction(sig, &act, &oact) < 0)
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141 return (SIG_ERR);
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142
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143 return (oact.sa_handler);
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144 }
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145
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146
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147 int
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148 main(argc, argv)
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149 int argc;
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150 char *argv[];
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151 {
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152 int i, key;
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153 int nogo = 0;
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154 struct hostent *he;
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155 struct timeval tv;
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156 time_t stamp, now;
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157
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158 metaserverflag = 0;
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159 #ifndef apollo
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160 nice(-20);
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161 nice(-20);
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162 nice(-20);
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163 #endif
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164
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165 for (i = 1; i < argc; i++)
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166 {
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167 if (*argv[i] == '-')
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168 {
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169 switch (argv[i][1])
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170 {
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171 case 'p':
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172 port = atoi(argv[i + 1]);
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173 break;
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174 case 'k':
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175 if (++i < argc && sscanf(argv[i], "%d", &key) > 0 && key > 0)
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176 set_env("TREKSHMKEY", argv[i]);
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177 else
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178 nogo++;
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179 break;
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180 case 'b':
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181 ntserv_binary = argv[++i];
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182 break;
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183 case 'h':
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184 case 'u': /* for old times sake, the others don't do
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185 * this, but this one does so it doesn't pass
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186 * to ntserv */
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187 case '-': /* same with this */
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188 nogo++;
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189 break;
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190 default:
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191 /* all unknown arguments are passed through to ntserv. */
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192 extraargs[extraargc++] = argv[i];
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193 }
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194 }
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195 /* else just ignore non flags */
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196 }
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197
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198 if ((program = strrchr(argv[0], '/')))
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199 ++program;
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200 else
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201 program = argv[0]; /* let err functions know our name */
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202
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203 if (nogo)
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204 printlistenUsage(program);
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205
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206 detach(); /* detach from terminal, close files, etc. */
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207 print_pid(); /* log the new PID */
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208 getListenSock();
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209 r_signal(SIGCHLD, reaper);
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210 r_signal(SIGTERM, terminate);
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211 r_signal(SIGHUP, SIG_IGN);
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212
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213 meta_addr = 0;
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214 stamp = 0;
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215 tv.tv_sec = 1;
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216 tv.tv_usec = 0;
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217
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218 while (1)
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219 {
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220 now = time(0);
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221 if (now - stamp > META_UPDATE_TIME)
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222 {
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223 he = gethostbyname(METASERVER);
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224 if (he)
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225 meta_addr = *((int *) he->h_addr);
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226 stamp = now;
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227 }
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228 getConnections();
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229 select(0, 0, 0, 0, &tv); /* wait one sec between each connection */
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230 }
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231 }
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232
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233 /***********************************************************************
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234 * Detach process in various ways.
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235 */
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236
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237 void
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238 detach()
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239 {
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240 int fd, rc, mode;
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241 char *fname;
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242
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243 mode = S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR;
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244 /* fname = build_path("startup.log"); */
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245 fname = build_path("logs/startup.log");
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246 if ((fd = open(fname, O_WRONLY | O_CREAT | O_APPEND, mode)) == -1)
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247 syserr(1, "detach", "couldn't open log file. [%s]", dateTime());
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248 dup2(fd, 2);
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249 dup2(fd, 1);
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250 multClose(1, 2, -1); /* close all other file descriptors */
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251 warnerr(0, "started at %s on port %d.", dateTime(), port);
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252
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253 /* fork once to escape the shells job control */
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254 if ((rc = fork()) > 0)
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255 exit(0);
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256 else if (rc < 0)
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257 syserr(1, "detach", "couldn't fork. [%s]", dateTime());
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258
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259 /* now detach from the controlling terminal */
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260
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261 #ifdef _SEQUENT_
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262 if ((fd = open("/dev/tty", O_RDWR | O_NOCTTY, 0)) >= 0)
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263 {
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264 (void) close(fd);
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265 }
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266 #else
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267 if ((fd = open("/dev/tty", O_RDWR, 0)) == -1)
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268 {
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269 warnerr("detach", "couldn't open tty, assuming still okay. [%s]",
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270 dateTime());
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271 return;
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272 }
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273 #if defined(SYSV) && defined(TIOCTTY)
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274 {
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275 int zero = 0;
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276 ioctl(fd, TIOCTTY, &zero);
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277 }
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278 #else
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279 ioctl(fd, TIOCNOTTY, 0);
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280 #endif
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281 close(fd);
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282 #endif /* _SEQUENT_ */
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283
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284 setsid(); /* make us a new process group/session */
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285 }
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286
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287 /***********************************************************************
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288 */
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289
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290 void
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291 getListenSock()
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292 {
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293 struct sockaddr_in addr;
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294
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295 if ((listenSock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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296 syserr(1, "getListenSock", "can't create listen socket. [%s]",
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297 dateTime());
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298
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299 addr.sin_family = AF_INET;
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300 addr.sin_addr.s_addr = INADDR_ANY;
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301 addr.sin_port = htons(port);
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302 {
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303 /* added this so we could handle nuking listen. KAO 3/26/93 */
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304 int foo = 1;
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305 if (setsockopt(listenSock, SOL_SOCKET, SO_REUSEADDR, (char *) &foo,
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306 sizeof(foo)) == -1)
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307 {
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308 fprintf(stderr, "Error setting socket options in listen.\n");
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309 exit(1);
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310 }
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311 }
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312 if (bind(listenSock, (struct sockaddr *) & addr, sizeof(addr)) < 0)
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313 syserr(1, "getListenSock", "can't bind listen socket. [%s]",
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314 dateTime());
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315
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316 if (listen(listenSock, 5) != 0)
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317 syserr(1, "getListenSock", "can't listen to socket. [%s]", dateTime());
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318 }
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319
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320 /***********************************************************************
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321 */
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322
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323 void
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324 getConnections()
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325 {
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326 int len, sock, pid, pa;
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327 struct sockaddr_in addr;
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328 struct hostent *he;
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329 char host[100];
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330
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331 len = sizeof(addr);
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332 while ((sock = accept(listenSock, (struct sockaddr *) & addr, &len)) < 0)
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333 {
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334 /* if we got interrupted by a dying child, just try again */
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335 if (errno == EINTR)
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336 continue;
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337 else
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338 syserr(1, "getConnections",
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339 "accept() on listen socket failed. [%s]", dateTime());
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340 }
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341
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342 /* get the host name */
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343 he = gethostbyaddr((char *) &addr.sin_addr.s_addr,
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344 sizeof(addr.sin_addr.s_addr), AF_INET);
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345 if (he != 0)
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346 {
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347 strcpy(host, he->h_name);
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348 pa = *((int *) he->h_addr);
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349 }
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350 else
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351 {
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352 strcpy(host, inet_ntoa(addr.sin_addr));
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353 pa = (int) addr.sin_addr.s_addr;
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354 }
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355
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356 if (pa == meta_addr)
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357 metaserverflag = 1;
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358 /* else */
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359 warnerr(0, "connect: %-33s[%s][%d]", host, dateTime(), metaserverflag);
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360
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361 /* fork off a server */
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362 if ((pid = fork()) == 0)
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363 {
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364 char *newargv[10];
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365 int newargc = 0;
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366 int i;
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367 char *binname;
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368 binname = build_path(ntserv_binary);
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369 dup2(sock, 0);
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370 multClose(0, 1, 2, -1); /* close everything else */
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371
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372 newargv[newargc++] = "ntserv";
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373 if (metaserverflag == 1)
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374 newargv[newargc++] = "-M";
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375 for (i = 0; i < extraargc; i++)
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376 newargv[newargc++] = extraargs[i];
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377 newargv[newargc++] = host;
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378 newargv[newargc] = 0;
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379
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380 execv(binname, newargv);
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381
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382 syserr(1, "getConnections",
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383 "couldn't execv %s as the server. [%s]",
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384 binname, dateTime());
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385 exit(1);
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386 }
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387 else if (pid < 0)
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388 syserr(1, "getConnections", "can't fork. [%s]", dateTime());
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389
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390 close(sock);
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391 metaserverflag = 0;
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392 }
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393
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394 /***********************************************************************
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395 * Adds "var=value" to environment list
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396 */
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397
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398 void
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399 set_env(var, value)
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400 char *var, *value;
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401 {
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402 char *buf;
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403 #if defined(SYSV) || defined(sparc)
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404 buf = malloc(strlen(var) + strlen(value) + 2);
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405 if (!buf)
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406 syserr(1, "set_env", "malloc() failed. [%s]", dateTime());
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407
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408 strcpy(buf, var);
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409 strcat(buf, "=");
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410 strcat(buf, value);
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411
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412 putenv(buf);
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413 #else
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414 /* don't need to malloc space, setenv() does it for us */
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415 setenv(var, value, 1);
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416 #endif
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417 }
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418
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419
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420 /***********************************************************************
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421 * Returns a string containing the date and time. String area is static
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422 * and reused.
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423 */
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424
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425 char *
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426 dateTime()
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427 {
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428 time_t t;
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429 char *s;
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430
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431 time(&t);
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432 s = ctime(&t);
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433 s[24] = '\0'; /* wipe-out the newline */
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434 return s;
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435 }
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436
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437 /***********************************************************************
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438 * Handler for SIGTERM. Closes and shutdowns everything.
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439 */
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440
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441 void
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442 terminate()
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443 {
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444 int s;
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445
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446 fatlerr(1, "terminate", "killed. [%s]", dateTime());
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447 #ifdef SYSV
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448 s = sysconf(_SC_OPEN_MAX);
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449 if (s < 0) /* value for OPEN_MAX is indeterminate, */
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450 s = 32; /* so make a guess */
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451 #else
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452 s = getdtablesize();
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453 #endif
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454 /* shutdown and close everything */
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455 for (; s >= 0; s--)
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456 {
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457 shutdown(s, 2);
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458 close(s);
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459 }
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460 }
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461
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462 /***********************************************************************
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463 * Waits on zombie children.
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464 */
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465
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466 void
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467 reaper()
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468 {
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469 #ifndef SVR4
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470 while (wait3(0, WNOHANG, 0) > 0);
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471 #else
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472 while (waitpid(0, 0, WNOHANG) > 0);
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473 #endif /* SVR4 */
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474 }
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475
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476 /***********************************************************************
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477 * Close all file descriptors except the ones specified in the argument list.
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478 * The list of file descriptors is terminated with -1 as the last arg.
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479 */
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480
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481 void
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482 multClose(va_alist) va_dcl
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483 {
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484 va_list args;
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485 int fds[100], nfds, fd, ts, i, j;
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486
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487 /* get all descriptors to be saved into the array fds */
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488 va_start(args);
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489 for (nfds = 0; nfds < 99; nfds++)
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490 {
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491 if ((fd = va_arg(args, int)) == -1)
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492 break;
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493 else
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494 fds[nfds] = fd;
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495 }
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496
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497 #ifdef SYSV
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498 ts = sysconf(_SC_OPEN_MAX);
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499 if (ts < 0) /* value for OPEN_MAX is indeterminate, */
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500 ts = 32; /* so make a guess */
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501 #else
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|
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502 ts = getdtablesize();
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|
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503 #endif
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|
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504
|
|
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505 /*
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506 * close all descriptors, but first check the fds array to see if this one
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|
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507 * is an exception
|
|
|
508 */
|
|
|
509 for (i = 0; i < ts; i++)
|
|
|
510 {
|
|
|
511 for (j = 0; j < nfds; j++)
|
|
|
512 if (i == fds[j])
|
|
|
513 break;
|
|
|
514 if (j == nfds)
|
|
|
515 close(i);
|
|
|
516 }
|
|
|
517 }
|
|
|
518
|
|
|
519 /***********************************************************************
|
|
|
520 * Error reporting functions taken from my library.
|
|
|
521 */
|
|
|
522
|
|
|
523 extern int sys_nerr;
|
|
|
524 #ifndef FreeBSD
|
|
|
525 extern char *sys_errlist[];
|
|
|
526 #endif
|
|
|
527 extern int errno;
|
|
|
528
|
|
|
529 void
|
|
|
530 syserr(va_alist) va_dcl
|
|
|
531 {
|
|
|
532 va_list args;
|
|
|
533 int rc;
|
|
|
534
|
|
|
535 va_start(args);
|
|
|
536 rc = va_arg(args, int);
|
|
|
537 err(args);
|
|
|
538 if (errno < sys_nerr)
|
|
|
539 fprintf(stderr, " system message: %s\n", sys_errlist[errno]);
|
|
|
540
|
|
|
541 exit(rc);
|
|
|
542 }
|
|
|
543
|
|
|
544 void
|
|
|
545 warnerr(va_alist) va_dcl
|
|
|
546 {
|
|
|
547 va_list args;
|
|
|
548
|
|
|
549 va_start(args);
|
|
|
550 err(args);
|
|
|
551 }
|
|
|
552
|
|
|
553 void
|
|
|
554 fatlerr(va_alist) va_dcl
|
|
|
555 {
|
|
|
556 va_list args;
|
|
|
557 int rc;
|
|
|
558
|
|
|
559 va_start(args);
|
|
|
560 rc = va_arg(args, int);
|
|
|
561 err(args);
|
|
|
562
|
|
|
563 exit(rc);
|
|
|
564 }
|
|
|
565
|
|
|
566 void
|
|
|
567 err(args)
|
|
|
568 va_list args;
|
|
|
569 {
|
|
|
570
|
|
|
571 char *func, *fmt;
|
|
|
572
|
|
|
573 if (program != 0)
|
|
|
574 fprintf(stderr, "%s", program);
|
|
|
575 func = va_arg(args, char *);
|
|
|
576 if (func != 0 && strcmp(func, "") != 0)
|
|
|
577 fprintf(stderr, "(%s)", func);
|
|
|
578 fprintf(stderr, ": ");
|
|
|
579
|
|
|
580 fmt = va_arg(args, char *);
|
|
|
581 vfprintf(stderr, fmt, args);
|
|
|
582 fputc('\n', stderr);
|
|
|
583 fflush(stderr);
|
|
|
584 }
|
|
|
585
|
|
|
586 char *
|
|
|
587 lasterr()
|
|
|
588 {
|
|
|
589 if (errno < sys_nerr)
|
|
|
590 return sys_errlist[errno];
|
|
|
591 else
|
|
|
592 return "No message text for this error.";
|
|
|
593 }
|
|
|
594
|
|
|
595 /*---------------------[ prints the usage of listen ]---------------------*/
|
|
|
596
|
|
|
597 void
|
|
|
598 printlistenUsage(char name[])
|
|
|
599 {
|
|
|
600 int x;
|
|
|
601 char message[][255] = {
|
|
|
602 "\n\t'%s [options]'\n\n",
|
|
|
603 "Options:\n",
|
|
|
604 "\t-h help (this usage message)\n",
|
|
|
605 "\t-p port other than default port\n",
|
|
|
606 "\t-k n use n as shared memory key number\n\n",
|
|
|
607 "Any unrecognized options are passed through to ntserv. For an up\n",
|
|
|
608 "to date listing of available ntserv options check the binary.\n",
|
|
|
609 "\nNOTE: in league play you must start up two listen processes, ",
|
|
|
610 "one for each port.\n\n",
|
|
|
611 "\0"
|
|
|
612 };
|
|
|
613
|
|
|
614 fprintf(stderr, "-- NetrekII (Paradise), %s --\n", PARAVERS);
|
|
|
615 for (x = 0; *message[x] != '\0'; x++)
|
|
|
616 fprintf(stderr, message[x], name);
|
|
|
617
|
|
|
618 exit(1);
|
|
|
619 }
|
|
|
620
|
|
|
621 /*--------------------------[ printlistenUsage ]--------------------------*/
|
|
|
622
|
|
|
623 /* set the pid logfile (BG) */
|
|
|
624 void
|
|
|
625 print_pid()
|
|
|
626 {
|
|
|
627 char *fname;
|
|
|
628 FILE *fptr;
|
|
|
629
|
|
|
630 fname = build_path("logs/listen.pid");
|
|
|
631 fptr = fopen(fname, "w+");
|
|
|
632 fprintf(fptr, "%d", getpid());
|
|
|
633 fclose(fptr);
|
|
|
634 }
|
