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annotate main.c @ 4:fe6bca95afa7

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Makefile.in contains updated files required
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
parents
children bc6477a6c393
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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 /* get commandline options */
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66 opts = getrunopts(argc, argv);
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67
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68 /* fork */
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69 if (opts->forkbg) {
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70 int closefds = 0;
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71 #ifndef DEBUG_TRACE
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72 if (!usingsyslog) {
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73 closefds = 1;
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74 }
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75 #endif
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76 if (daemon(0, closefds) < 0) {
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77 dropbear_exit("Failed to create background process: %s",
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78 strerror(errno));
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79 }
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80 }
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81
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82 #ifndef DISABLE_SYSLOG
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83 if (usingsyslog) {
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84 startsyslog();
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85 }
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86 #endif
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87
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88 /* should be done after syslog is working */
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89 if (opts->forkbg) {
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90 dropbear_log(LOG_INFO, "Running in background");
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91 } else {
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92 dropbear_log(LOG_INFO, "Not forking");
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93 }
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94
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95 /* create a PID file so that we can be killed easily */
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96 pidfile = fopen(DROPBEAR_PIDFILE, "w");
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97 if (pidfile) {
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98 fprintf(pidfile, "%d\n", getpid());
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99 fclose(pidfile);
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100 }
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101
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102 /* set up cleanup handler */
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103 if (signal(SIGINT, sigintterm_handler) == SIG_ERR ||
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104 #ifndef DEBUG_VALGRIND
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105 signal(SIGTERM, sigintterm_handler) == SIG_ERR ||
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106 #endif
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107 signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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108 dropbear_exit("signal() error");
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109 }
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110
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111 /* catch and reap zombie children */
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112 sa_chld.sa_handler = sigchld_handler;
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113 sa_chld.sa_flags = SA_NOCLDSTOP;
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114 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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115 dropbear_exit("signal() error");
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116 }
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117 if (signal(SIGSEGV, sigsegv_handler) == SIG_ERR) {
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118 dropbear_exit("signal() error");
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119 }
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120
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121 /* sockets to identify pre-authenticated clients */
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122 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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123 childpipes[i] = -1;
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124 }
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125
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126 /* Set up the listening sockets */
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127 /* XXX XXX ports */
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128 listensockcount = listensockets(listensocks, opts, &maxsock);
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129
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130 /* incoming connection select loop */
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131 for(;;) {
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132
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133 FD_ZERO(&fds);
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134
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135 seltimeout.tv_sec = 60;
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136 seltimeout.tv_usec = 0;
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137
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138 /* listening sockets */
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139 for (i = 0; i < listensockcount; i++) {
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140 FD_SET(listensocks[i], &fds);
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141 }
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142
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143 /* pre-authentication clients */
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144 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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145 if (childpipes[i] >= 0) {
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146 FD_SET(childpipes[i], &fds);
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147 maxsock = MAX(maxsock, childpipes[i]);
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148 }
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149 }
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150
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151 val = select(maxsock+1, &fds, NULL, NULL, &seltimeout);
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152
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153 if (exitflag) {
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154 unlink(DROPBEAR_PIDFILE);
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155 dropbear_exit("Terminated by signal");
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156 }
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157
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parents:
diff changeset
158 if (val == 0) {
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diff changeset
159 /* timeout reached */
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parents:
diff changeset
160 continue;
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parents:
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161 }
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162
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parents:
diff changeset
163 if (val < 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 if (errno == EINTR) {
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165 continue;
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parents:
diff changeset
166 }
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parents:
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167 dropbear_exit("Listening socket error");
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168 }
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169
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 /* close fds which have been authed or closed - auth.c handles
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parents:
diff changeset
171 * closing the auth sockets on success */
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172 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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173 if (childpipes[i] >= 0 && FD_ISSET(childpipes[i], &fds)) {
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174 close(childpipes[i]);
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175 childpipes[i] = -1;
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176 }
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177 }
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178
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179 /* handle each socket which has something to say */
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180 for (i = 0; i < listensockcount; i++) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
181 if (!FD_ISSET(listensocks[i], &fds))
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parents:
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182 continue;
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183
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parents:
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184 /* child connection XXX - ip6 stuff here */
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185 remoteaddrlen = sizeof(struct sockaddr_in);
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186 childsock = accept(listensocks[i], &remoteaddr, &remoteaddrlen);
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187
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188 if (childsock < 0) {
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diff changeset
189 /* accept failed */
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diff changeset
190 continue;
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parents:
diff changeset
191 }
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192
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parents:
diff changeset
193 /* check for max number of connections not authorised */
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194 for (j = 0; j < MAX_UNAUTH_CLIENTS; j++) {
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parents:
diff changeset
195 if (childpipes[j] < 0) {
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parents:
diff changeset
196 break;
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parents:
diff changeset
197 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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198 }
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199
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 if (j == MAX_UNAUTH_CLIENTS) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 /* no free connections */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 /* TODO - possibly log, though this would be an easy way
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 * to fill logs/disk */
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diff changeset
204 close(childsock);
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parents:
diff changeset
205 continue;
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parents:
diff changeset
206 }
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207
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parents:
diff changeset
208 if (pipe(childpipe) < 0) {
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diff changeset
209 TRACE(("error creating child pipe"));
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diff changeset
210 close(childsock);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 continue;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 }
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213
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 if ((childpid = fork()) == 0) {
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215
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parents:
diff changeset
216 /* child */
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parents:
diff changeset
217 char * addrstring = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 #ifdef DEBUG_FORKGPROF
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parents:
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219 extern void _start(void), etext(void);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 monstartup((u_long)&_start, (u_long)&etext);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 #endif /* DEBUG_FORKGPROF */
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222
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parents:
diff changeset
223 addrstring = getaddrstring(&remoteaddr);
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parents:
diff changeset
224 dropbear_log(LOG_INFO, "Child connection from %s", addrstring);
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diff changeset
225 m_free(addrstring);
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parents:
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226
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 if (setsid() < 0) {
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parents:
diff changeset
228 dropbear_exit("setsid: %s", strerror(errno));
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parents:
diff changeset
229 }
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diff changeset
230
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parents:
diff changeset
231 /* make sure we close sockets */
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parents:
diff changeset
232 for (i = 0; i < listensockcount; i++) {
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parents:
diff changeset
233 if (m_close(listensocks[i]) == DROPBEAR_FAILURE) {
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parents:
diff changeset
234 dropbear_exit("Couldn't close socket");
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parents:
diff changeset
235 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 }
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parents:
diff changeset
237
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parents:
diff changeset
238 if (m_close(childpipe[0]) == DROPBEAR_FAILURE) {
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parents:
diff changeset
239 dropbear_exit("Couldn't close socket");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 /* start the session */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 child_session(childsock, opts, childpipe[1], &remoteaddr);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 /* don't return */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 assert(0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 }
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parents:
diff changeset
246
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 /* parent */
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parents:
diff changeset
248 childpipes[j] = childpipe[0];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 if (m_close(childpipe[1]) == DROPBEAR_FAILURE
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 || m_close(childsock) == DROPBEAR_FAILURE) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 dropbear_exit("Couldn't close socket");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 } /* for(;;) loop */
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parents:
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255
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 /* don't reach here */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 return -1;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 #endif
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parents:
diff changeset
260
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 /* catch + reap zombie children */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 static void sigchld_handler(int fish) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 struct sigaction sa_chld;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 while(waitpid(-1, NULL, WNOHANG) > 0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 sa_chld.sa_handler = sigchld_handler;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 sa_chld.sa_flags = SA_NOCLDSTOP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
269 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 dropbear_exit("signal() error");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 }
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parents:
diff changeset
273
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 /* catch any segvs */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275 static void sigsegv_handler(int fish) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
276 fprintf(stderr, "Aiee, segfault! You should probably report "
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277 "this as a bug to the developer\n");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
278 exit(EXIT_FAILURE);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 }
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parents:
diff changeset
280
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281 /* catch ctrl-c or sigterm */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282 static void sigintterm_handler(int fish) {
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parents:
diff changeset
283
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 exitflag = 1;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 /* Set up listening sockets for all the requested ports */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 static int listensockets(int *sock, runopts * opts, int *maxfd) {
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parents:
diff changeset
289
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 int listensock; /* listening fd */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 struct sockaddr_in listen_addr;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292 struct linger linger;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293 unsigned int i;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 int val;
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parents:
diff changeset
295
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296 for (i = 0; i < opts->portcount; i++) {
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parents:
diff changeset
297
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
298 /* iterate through all the sockets to listen on */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
299 listensock = socket(PF_INET, SOCK_STREAM, 0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300 if (listensock < 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 dropbear_exit("Failed to create socket");
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
303
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
304 val = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
305 /* set to reuse, quick timeout */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
306 setsockopt(listensock, SOL_SOCKET, SO_REUSEADDR,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307 (void*) &val, sizeof(val));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308 linger.l_onoff = 1;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309 linger.l_linger = 5;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310 setsockopt(listensock, SOL_SOCKET, SO_LINGER,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
311 (void*)&linger, sizeof(linger));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313 /* disable nagle */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
314 setsockopt(listensock, IPPROTO_TCP, TCP_NODELAY,
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Matt Johnston <matt@ucc.asn.au>
parents:
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315 (void*)&val, sizeof(val));
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316
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317 memset((void*)&listen_addr, 0x0, sizeof(listen_addr));
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318 listen_addr.sin_family = AF_INET;
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319 listen_addr.sin_port = htons(opts->ports[i]);
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320 listen_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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321 memset(&(listen_addr.sin_zero), '\0', 8);
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322
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323 if (bind(listensock, (struct sockaddr *)&listen_addr,
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324 sizeof(listen_addr)) < 0) {
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325 dropbear_exit("Bind failed port %d", opts->ports[i]);
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326 }
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327
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328 /* listen */
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329 if (listen(listensock, 20) < 0) { /* TODO set listen count */
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330 dropbear_exit("Listen failed");
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331 }
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332
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333 /* nonblock */
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334 if (fcntl(listensock, F_SETFL, O_NONBLOCK) < 0) {
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335 dropbear_exit("Failed to set non-blocking");
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336 }
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337
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338 sock[i] = listensock;
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339 *maxfd = MAX(listensock, *maxfd);
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340 }
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341
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342 return opts->portcount;
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343 }