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1 /*
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2 * TCP/IP stream emulation for GNU Emacs.
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3 * Copyright (C) 1988, 1989, 1992, 1993 Free Software Foundation, Inc.
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4
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5 * Author: Masanobu Umeda
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6 * Maintainer: umerin@mse.kyutech.ac.jp
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7
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8 This file is part of GNU Emacs.
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9
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10 GNU Emacs is free software; you can redistribute it and/or modify
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11 it under the terms of the GNU General Public License as published by
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12 the Free Software Foundation; either version 2, or (at your option)
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13 any later version.
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14
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15 GNU Emacs is distributed in the hope that it will be useful,
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16 but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 GNU General Public License for more details.
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19
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20 You should have received a copy of the GNU General Public License
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21 along with GNU Emacs; see the file COPYING. If not, write to
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22 the Free the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 Boston, MA 02111-1307, USA.
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24
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25 *
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26 * Yasunari, Itoh at PFU limited contributed for Fujitsu UTS and SX/A.
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27 *
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28 * Thu Apr 6 13:47:37 JST 1989
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29 * USG fixes by Sakaeda <saka@mickey.trad.pf.fujitsu.junet>
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30 *
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31 * For Fujitsu UTS compile with:
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32 * cc -O -o tcp tcp.c -DFUJITSU_UTS -lu -lsocket
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33 */
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34
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35 #include <stdio.h>
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36 #include <fcntl.h>
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37 #include <ctype.h>
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38 #include <sys/types.h>
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39
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40 #ifdef FUJITSU_UTS
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41 #define USG
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42 #include <sys/ucbtypes.h>
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43 #include <sys/tisp/socket.h>
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44 #include <netdb.h>
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45 #include <sys/tisp/in.h>
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46 #else
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47 #include <sys/socket.h>
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48 #include <netdb.h>
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49 #include <netinet/in.h>
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50 #endif
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51
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52 #ifdef USG
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53 #include <sys/stat.h>
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54 #include <signal.h>
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55 #endif
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56
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57 #ifdef USG
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58 int selectable = 1;
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59
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60 sigout ()
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61 {
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62 fcntl (fileno (stdin), F_SETFL, 0);
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63 exit (-1);
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64 }
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65 #endif
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66
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67 main (argc, argv)
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68 int argc;
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69 char *argv[];
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70 {
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71 struct hostent *host;
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72 struct sockaddr_in sockin, sockme;
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73 struct servent *serv;
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74 char *hostname = NULL;
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75 char *service = "nntp";
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76 int port;
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77 int readfds;
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78 int writefds;
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79 int server; /* NNTP Server */
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80 int emacsIn = fileno (stdin); /* Emacs intput */
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81 int emacsOut = fileno (stdout); /* Emacs output */
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82 char buffer[1024];
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83 int nbuffer; /* Number of bytes in buffer */
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84 int wret;
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85 char *retry; /* retry bufferp */
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86 int false = 0; /* FALSE flag for setsockopt () */
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87
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88 if (argc < 2)
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89 {
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90 fprintf (stderr, "Usage: %s HOST [SERVICE]\n", argv[0]);
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91 exit (1);
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92 }
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93 if (argc >= 2)
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94 hostname = argv[1];
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95 if (argc >= 3)
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96 service = argv[2];
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97
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98 if ((host = gethostbyname (hostname)) == NULL)
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99 {
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100 perror ("gethostbyname");
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101 exit (1);
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102 }
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103 if (isdigit (service[0]))
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104 port = atoi (service);
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105 else
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106 {
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107 serv = getservbyname (service, "tcp");
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108 if (serv == NULL)
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109 {
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110 perror ("getservbyname");
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111 exit (1);
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112 }
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113 port = serv->s_port;
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114 }
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115
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116 memset (&sockin, 0, sizeof (sockin));
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117 sockin.sin_family = host->h_addrtype;
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118 memcpy (&sockin.sin_addr, host->h_addr, host->h_length);
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119 sockin.sin_port = port;
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120 if ((server = socket (AF_INET, SOCK_STREAM, 0)) < 0)
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121 {
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122 perror ("socket");
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123 exit (1);
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124 }
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125 if (setsockopt (server, SOL_SOCKET, SO_REUSEADDR, &false, sizeof (false)))
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126 {
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127 perror ("setsockopt");
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128 exit (1);
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129 }
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130 memset (&sockme, 0, sizeof (sockme));
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131 sockme.sin_family = sockin.sin_family;
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132 sockme.sin_addr.s_addr = INADDR_ANY;
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133 if (bind (server, &sockme, sizeof (sockme)) < 0)
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134 {
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135 perror ("bind");
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136 exit (1);
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137 }
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138 if (connect (server, &sockin, sizeof (sockin)) < 0)
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139 {
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140 perror ("connect");
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141 close (server);
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142 exit (1);
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143 }
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144
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145 #ifdef O_NDELAY
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146 fcntl (server, F_SETFL, O_NDELAY);
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147
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148 #ifdef USG
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149 /* USG pipe cannot not select emacsIn */
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150 {
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151 struct stat statbuf;
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152 fstat (emacsIn, &statbuf);
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153 if (statbuf.st_mode & 010000)
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154 selectable = 0;
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155 if (!selectable)
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156 {
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157 signal (SIGINT, sigout);
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158 fcntl (emacsIn, F_SETFL, O_NDELAY);
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159 }
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160 }
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161 #endif
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162 #endif
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163
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164 /* Connection established. */
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165 while (1)
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166 {
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167 readfds = (1 << server) | (1 << emacsIn);
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168 if (select (32, &readfds, NULL, NULL, (struct timeval *)NULL) == -1)
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169 {
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170 perror ("select");
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171 exit (1);
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172 }
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173 if (readfds & (1 << emacsIn))
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174 {
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175 /* From Emacs */
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176 nbuffer = read (emacsIn, buffer, sizeof buffer -1);
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177
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178 #ifdef USG
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179 if (selectable && nbuffer == 0)
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180 {
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181 goto finish;
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182 }
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183 else if (!(readfds & (1 << server)) && nbuffer == 0)
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184 {
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185 sleep (1);
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186 }
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187 else
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188 #else
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189 if (nbuffer == 0)
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190 goto finish;
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191 #endif
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192 for (retry = buffer; nbuffer > 0; nbuffer -= wret, retry += wret)
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193 {
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194 writefds = 1 << server;
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195 if (select (server+1, NULL, &writefds, NULL, (struct timeval*)NULL) == -1)
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196 {
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197 perror ("select");
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198 exit (1);
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199 }
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200 wret = write (server, retry, nbuffer);
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201 if (wret < 0) goto finish;
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202 }
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203 }
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204 if (readfds & (1 << server))
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205 {
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206 /* From NNTP server */
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207 nbuffer = read (server, buffer, sizeof buffer -1);
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208 if (nbuffer == 0)
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209 goto finish;
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210 for (retry = buffer; nbuffer > 0; nbuffer -= wret, retry += wret)
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211 {
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212 writefds = 1 << emacsOut;
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213 #ifdef USG
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214 if (selectable)
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215 #endif
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216 if (select (emacsOut+1, NULL, &writefds, NULL, (struct timeval*)NULL) == -1)
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217 {
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218 perror ("select");
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219 exit (1);
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220 }
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221 wret = write (emacsOut, retry, nbuffer);
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222 if (wret < 0) goto finish;
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223 }
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224 }
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225 }
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226
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227 /* End of communication. */
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228 finish:
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229 close (server);
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230 #ifdef USG
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231 if (!selectable) fcntl (emacsIn, F_SETFL, 0);
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232 #endif
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233 close (emacsIn);
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234 close (emacsOut);
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235 exit (0);
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236 }
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