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annotate main.c @ 5:bc6477a6c393

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syntactical fixups - it compiles, but channel handling code requires fixing.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 04:20:12 +0000
parents fe6bca95afa7
children 469950e86d0f
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "session.h"
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28 #include "buffer.h"
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29 #include "signkey.h"
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30 #include "runopts.h"
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31
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32 static int listensockets(int *sock, runopts * opts, int *maxfd);
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33 static void sigchld_handler(int dummy);
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34 static void sigsegv_handler(int);
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35 static void sigintterm_handler(int fish);
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36
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37 static int childpipes[MAX_UNAUTH_CLIENTS];
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38
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39 #if defined(DBMULTI_DROPBEAR) || !defined(DROPBEAR_MULTI)
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40 #if defined(DBMULTI_DROPBEAR) && defined(DROPBEAR_MULTI)
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41 int dropbear_main(int argc, char ** argv)
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42 #else
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43 int main(int argc, char ** argv)
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44 #endif
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45 {
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46
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47 fd_set fds;
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48 struct timeval seltimeout;
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49 unsigned int i, j;
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50 int val;
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51 int maxsock = -1;
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52 struct sockaddr remoteaddr;
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53 int remoteaddrlen;
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54 int listensocks[MAX_LISTEN_ADDR];
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55 unsigned int listensockcount = 0;
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56 runopts * opts;
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57 FILE * pidfile;
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58
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59 int childsock;
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60 pid_t childpid;
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61 int childpipe[2];
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62
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63 struct sigaction sa_chld;
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64
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65 _dropbear_exit = svr_dropbear_exit;
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66 _dropbear_log = svr_dropbear_log;
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67
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68 /* get commandline options */
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69 opts = svr_getopts(argc, argv);
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70
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71 /* fork */
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72 if (opts->forkbg) {
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73 int closefds = 0;
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74 #ifndef DEBUG_TRACE
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75 if (!usingsyslog) {
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76 closefds = 1;
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77 }
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78 #endif
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79 if (daemon(0, closefds) < 0) {
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80 dropbear_exit("Failed to create background process: %s",
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81 strerror(errno));
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82 }
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83 }
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84
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85 #ifndef DISABLE_SYSLOG
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86 if (usingsyslog) {
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87 startsyslog();
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88 }
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89 #endif
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90
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91 /* should be done after syslog is working */
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92 if (opts->forkbg) {
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93 dropbear_log(LOG_INFO, "Running in background");
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94 } else {
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95 dropbear_log(LOG_INFO, "Not forking");
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96 }
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97
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98 /* create a PID file so that we can be killed easily */
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99 pidfile = fopen(DROPBEAR_PIDFILE, "w");
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100 if (pidfile) {
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101 fprintf(pidfile, "%d\n", getpid());
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102 fclose(pidfile);
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103 }
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104
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105 /* set up cleanup handler */
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106 if (signal(SIGINT, sigintterm_handler) == SIG_ERR ||
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107 #ifndef DEBUG_VALGRIND
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108 signal(SIGTERM, sigintterm_handler) == SIG_ERR ||
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109 #endif
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110 signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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111 dropbear_exit("signal() error");
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112 }
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113
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114 /* catch and reap zombie children */
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115 sa_chld.sa_handler = sigchld_handler;
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116 sa_chld.sa_flags = SA_NOCLDSTOP;
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117 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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118 dropbear_exit("signal() error");
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119 }
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120 if (signal(SIGSEGV, sigsegv_handler) == SIG_ERR) {
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121 dropbear_exit("signal() error");
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122 }
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123
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124 /* sockets to identify pre-authenticated clients */
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125 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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126 childpipes[i] = -1;
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127 }
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128
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129 /* Set up the listening sockets */
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130 /* XXX XXX ports */
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131 listensockcount = listensockets(listensocks, opts, &maxsock);
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132
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133 /* incoming connection select loop */
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134 for(;;) {
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135
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136 FD_ZERO(&fds);
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137
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138 seltimeout.tv_sec = 60;
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139 seltimeout.tv_usec = 0;
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140
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141 /* listening sockets */
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142 for (i = 0; i < listensockcount; i++) {
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143 FD_SET(listensocks[i], &fds);
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144 }
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145
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146 /* pre-authentication clients */
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147 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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148 if (childpipes[i] >= 0) {
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149 FD_SET(childpipes[i], &fds);
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150 maxsock = MAX(maxsock, childpipes[i]);
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151 }
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152 }
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153
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154 val = select(maxsock+1, &fds, NULL, NULL, &seltimeout);
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155
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156 if (exitflag) {
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157 unlink(DROPBEAR_PIDFILE);
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158 dropbear_exit("Terminated by signal");
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159 }
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160
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161 if (val == 0) {
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162 /* timeout reached */
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163 continue;
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164 }
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165
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166 if (val < 0) {
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167 if (errno == EINTR) {
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168 continue;
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169 }
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170 dropbear_exit("Listening socket error");
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171 }
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172
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173 /* close fds which have been authed or closed - auth.c handles
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174 * closing the auth sockets on success */
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175 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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176 if (childpipes[i] >= 0 && FD_ISSET(childpipes[i], &fds)) {
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177 close(childpipes[i]);
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178 childpipes[i] = -1;
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179 }
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180 }
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181
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182 /* handle each socket which has something to say */
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183 for (i = 0; i < listensockcount; i++) {
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184 if (!FD_ISSET(listensocks[i], &fds))
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185 continue;
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186
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187 /* child connection XXX - ip6 stuff here */
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188 remoteaddrlen = sizeof(struct sockaddr_in);
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189 childsock = accept(listensocks[i], &remoteaddr, &remoteaddrlen);
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190
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191 if (childsock < 0) {
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192 /* accept failed */
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193 continue;
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194 }
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195
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196 /* check for max number of connections not authorised */
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197 for (j = 0; j < MAX_UNAUTH_CLIENTS; j++) {
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198 if (childpipes[j] < 0) {
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199 break;
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200 }
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201 }
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202
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203 if (j == MAX_UNAUTH_CLIENTS) {
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204 /* no free connections */
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205 /* TODO - possibly log, though this would be an easy way
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206 * to fill logs/disk */
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207 close(childsock);
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208 continue;
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209 }
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210
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211 if (pipe(childpipe) < 0) {
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212 TRACE(("error creating child pipe"));
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213 close(childsock);
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214 continue;
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215 }
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216
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217 if ((childpid = fork()) == 0) {
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218
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219 /* child */
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220 char * addrstring = NULL;
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221 #ifdef DEBUG_FORKGPROF
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222 extern void _start(void), etext(void);
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223 monstartup((u_long)&_start, (u_long)&etext);
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224 #endif /* DEBUG_FORKGPROF */
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225
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226 addrstring = getaddrstring(&remoteaddr);
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227 dropbear_log(LOG_INFO, "Child connection from %s", addrstring);
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228 m_free(addrstring);
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229
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230 if (setsid() < 0) {
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231 dropbear_exit("setsid: %s", strerror(errno));
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232 }
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233
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234 /* make sure we close sockets */
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235 for (i = 0; i < listensockcount; i++) {
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236 if (m_close(listensocks[i]) == DROPBEAR_FAILURE) {
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237 dropbear_exit("Couldn't close socket");
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238 }
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239 }
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240
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241 if (m_close(childpipe[0]) == DROPBEAR_FAILURE) {
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242 dropbear_exit("Couldn't close socket");
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243 }
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244 /* start the session */
5
bc6477a6c393 syntactical fixups - it compiles, but channel handling code requires fixing.
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parents: 4
diff changeset
245 svr_session(childsock, opts, childpipe[1], &remoteaddr);
4
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246 /* don't return */
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247 assert(0);
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248 }
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249
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250 /* parent */
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251 childpipes[j] = childpipe[0];
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252 if (m_close(childpipe[1]) == DROPBEAR_FAILURE
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253 || m_close(childsock) == DROPBEAR_FAILURE) {
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254 dropbear_exit("Couldn't close socket");
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255 }
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256 }
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257 } /* for(;;) loop */
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258
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259 /* don't reach here */
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260 return -1;
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261 }
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262 #endif
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263
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264 /* catch + reap zombie children */
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diff changeset
265 static void sigchld_handler(int fish) {
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266 struct sigaction sa_chld;
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267
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268 while(waitpid(-1, NULL, WNOHANG) > 0);
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269
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270 sa_chld.sa_handler = sigchld_handler;
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271 sa_chld.sa_flags = SA_NOCLDSTOP;
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272 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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273 dropbear_exit("signal() error");
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274 }
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275 }
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276
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277 /* catch any segvs */
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278 static void sigsegv_handler(int fish) {
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279 fprintf(stderr, "Aiee, segfault! You should probably report "
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parents:
diff changeset
280 "this as a bug to the developer\n");
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281 exit(EXIT_FAILURE);
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282 }
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283
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parents:
diff changeset
284 /* catch ctrl-c or sigterm */
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diff changeset
285 static void sigintterm_handler(int fish) {
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286
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287 exitflag = 1;
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288 }
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289
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parents:
diff changeset
290 /* Set up listening sockets for all the requested ports */
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parents:
diff changeset
291 static int listensockets(int *sock, runopts * opts, int *maxfd) {
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292
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diff changeset
293 int listensock; /* listening fd */
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parents:
diff changeset
294 struct sockaddr_in listen_addr;
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295 struct linger linger;
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diff changeset
296 unsigned int i;
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diff changeset
297 int val;
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298
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diff changeset
299 for (i = 0; i < opts->portcount; i++) {
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300
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parents:
diff changeset
301 /* iterate through all the sockets to listen on */
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parents:
diff changeset
302 listensock = socket(PF_INET, SOCK_STREAM, 0);
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diff changeset
303 if (listensock < 0) {
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diff changeset
304 dropbear_exit("Failed to create socket");
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305 }
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306
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diff changeset
307 val = 1;
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parents:
diff changeset
308 /* set to reuse, quick timeout */
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parents:
diff changeset
309 setsockopt(listensock, SOL_SOCKET, SO_REUSEADDR,
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diff changeset
310 (void*) &val, sizeof(val));
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diff changeset
311 linger.l_onoff = 1;
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312 linger.l_linger = 5;
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313 setsockopt(listensock, SOL_SOCKET, SO_LINGER,
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314 (void*)&linger, sizeof(linger));
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315
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316 /* disable nagle */
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317 setsockopt(listensock, IPPROTO_TCP, TCP_NODELAY,
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318 (void*)&val, sizeof(val));
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319
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320 memset((void*)&listen_addr, 0x0, sizeof(listen_addr));
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321 listen_addr.sin_family = AF_INET;
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322 listen_addr.sin_port = htons(opts->ports[i]);
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323 listen_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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324 memset(&(listen_addr.sin_zero), '\0', 8);
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325
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326 if (bind(listensock, (struct sockaddr *)&listen_addr,
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327 sizeof(listen_addr)) < 0) {
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328 dropbear_exit("Bind failed port %d", opts->ports[i]);
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329 }
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330
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331 /* listen */
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332 if (listen(listensock, 20) < 0) { /* TODO set listen count */
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333 dropbear_exit("Listen failed");
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334 }
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335
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336 /* nonblock */
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337 if (fcntl(listensock, F_SETFL, O_NONBLOCK) < 0) {
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338 dropbear_exit("Failed to set non-blocking");
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339 }
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340
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341 sock[i] = listensock;
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342 *maxfd = MAX(listensock, *maxfd);
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343 }
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344
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345 return opts->portcount;
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346 }