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annotate svr-main.c @ 338:1c7a072000e0

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BUG: mp_div_2d returns status and it isn't checked. FIX: Check and return status. From Erik Hovland
author Matt Johnston <matt@ucc.asn.au>
date Fri, 07 Jul 2006 06:43:55 +0000
parents 3bfbe95f9a14
children b66a00272a90
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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94ee16f5b8a8 0.48 progress
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4 * Copyright (c) 2002-2006 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 #include "random.h"
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32
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33 static size_t listensockets(int *sock, size_t sockcount, int *maxfd);
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34 static void sigchld_handler(int dummy);
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35 static void sigsegv_handler(int);
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36 static void sigintterm_handler(int fish);
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37 #ifdef INETD_MODE
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38 static void main_inetd();
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39 #endif
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40 #ifdef NON_INETD_MODE
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41 static void main_noinetd();
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42 #endif
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43 static void commonsetup();
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44
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45 #if defined(DBMULTI_dropbear) || !defined(DROPBEAR_MULTI)
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46 #if defined(DBMULTI_dropbear) && defined(DROPBEAR_MULTI)
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47 int dropbear_main(int argc, char ** argv)
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48 #else
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49 int main(int argc, char ** argv)
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50 #endif
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51 {
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52 _dropbear_exit = svr_dropbear_exit;
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53 _dropbear_log = svr_dropbear_log;
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54
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55 /* get commandline options */
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56 svr_getopts(argc, argv);
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57
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58 #ifdef INETD_MODE
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59 /* service program mode */
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60 if (svr_opts.inetdmode) {
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61 main_inetd();
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62 /* notreached */
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63 }
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64 #endif
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65
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66 #ifdef NON_INETD_MODE
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67 main_noinetd();
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68 /* notreached */
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69 #endif
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70
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71 dropbear_exit("Compiled without normal mode, can't run without -i\n");
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72 return -1;
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73 }
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74 #endif
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75
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76 #ifdef INETD_MODE
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77 static void main_inetd() {
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78
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79 struct sockaddr_storage remoteaddr;
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80 socklen_t remoteaddrlen;
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81 char * addrstring = NULL;
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82
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83 /* Set up handlers, syslog, seed random */
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84 commonsetup();
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85
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86 remoteaddrlen = sizeof(remoteaddr);
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87 if (getpeername(0, (struct sockaddr*)&remoteaddr, &remoteaddrlen) < 0) {
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88 dropbear_exit("Unable to getpeername: %s", strerror(errno));
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89 }
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90
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91 /* In case our inetd was lax in logging source addresses */
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92 addrstring = getaddrstring(&remoteaddr, 1);
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93 dropbear_log(LOG_INFO, "Child connection from %s", addrstring);
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94
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95 /* Don't check the return value - it may just fail since inetd has
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96 * already done setsid() after forking (xinetd on Darwin appears to do
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97 * this */
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98 setsid();
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99
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100 /* Start service program
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101 * -1 is a dummy childpipe, just something we can close() without
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102 * mattering. */
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103 svr_session(0, -1, getaddrhostname(&remoteaddr), addrstring);
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104
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105 /* notreached */
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106 }
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107 #endif /* INETD_MODE */
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108
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109 #ifdef NON_INETD_MODE
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110 void main_noinetd() {
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111 fd_set fds;
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112 struct timeval seltimeout;
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113 unsigned int i, j;
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114 int val;
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115 int maxsock = -1;
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116 int listensocks[MAX_LISTEN_ADDR];
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117 size_t listensockcount = 0;
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118 FILE *pidfile = NULL;
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119
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120 int childpipes[MAX_UNAUTH_CLIENTS];
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121 char * preauth_addrs[MAX_UNAUTH_CLIENTS];
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122
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123 int childsock;
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124 int childpipe[2];
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125
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126 /* fork */
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127 if (svr_opts.forkbg) {
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128 int closefds = 0;
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129 #ifndef DEBUG_TRACE
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130 if (!svr_opts.usingsyslog) {
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131 closefds = 1;
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132 }
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133 #endif
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134 if (daemon(0, closefds) < 0) {
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135 dropbear_exit("Failed to daemonize: %s", strerror(errno));
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136 }
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diff changeset
137 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
138
71
ac96bc733e71 adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
139 commonsetup();
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 /* should be done after syslog is working */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 if (svr_opts.forkbg) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 dropbear_log(LOG_INFO, "Running in background");
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 } else {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 dropbear_log(LOG_INFO, "Not forking");
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 /* create a PID file so that we can be killed easily */
323
3bfbe95f9a14 Add -P pidfile patch from Swen Schillig
Matt Johnston <matt@ucc.asn.au>
parents: 298
diff changeset
149 pidfile = fopen(svr_opts.pidfile, "w");
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 if (pidfile) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 fprintf(pidfile, "%d\n", getpid());
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 fclose(pidfile);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 /* sockets to identify pre-authenticated clients */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 childpipes[i] = -1;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 }
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
159 bzero(preauth_addrs, sizeof(preauth_addrs));
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 /* Set up the listening sockets */
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
162 listensockcount = listensockets(listensocks, MAX_LISTEN_ADDR, &maxsock);
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
163 if (listensockcount == 0)
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
164 {
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
165 dropbear_exit("No listening ports available.");
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
166 }
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 /* incoming connection select loop */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169 for(;;) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 FD_ZERO(&fds);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 seltimeout.tv_sec = 60;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 seltimeout.tv_usec = 0;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 /* listening sockets */
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
177 for (i = 0; i < listensockcount; i++) {
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 FD_SET(listensocks[i], &fds);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 /* pre-authentication clients */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 if (childpipes[i] >= 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 FD_SET(childpipes[i], &fds);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 maxsock = MAX(maxsock, childpipes[i]);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 val = select(maxsock+1, &fds, NULL, NULL, &seltimeout);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 if (exitflag) {
323
3bfbe95f9a14 Add -P pidfile patch from Swen Schillig
Matt Johnston <matt@ucc.asn.au>
parents: 298
diff changeset
192 unlink(svr_opts.pidfile);
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 dropbear_exit("Terminated by signal");
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 if (val == 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197 /* timeout reached */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 if (val < 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 if (errno == EINTR) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 dropbear_exit("Listening socket error");
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
208 /* close fds which have been authed or closed - svr-auth.c handles
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 * closing the auth sockets on success */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 if (childpipes[i] >= 0 && FD_ISSET(childpipes[i], &fds)) {
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
212 m_close(childpipes[i]);
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 childpipes[i] = -1;
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
214 m_free(preauth_addrs[i]);
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 /* handle each socket which has something to say */
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
219 for (i = 0; i < listensockcount; i++) {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
220
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
221 struct sockaddr_storage remoteaddr;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
222 socklen_t remoteaddrlen = 0;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
223 size_t num_unauthed_for_addr = 0;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
224 size_t num_unauthed_total = 0;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
225 char * remote_addr_str = NULL;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
226 pid_t fork_ret = 0;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
227 size_t conn_idx = 0;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
228
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 if (!FD_ISSET(listensocks[i], &fds))
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
232 remoteaddrlen = sizeof(remoteaddr);
63
dcc43965928f - A nice cleaner structure for tcp (acceptor) forwarding.
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
233 childsock = accept(listensocks[i],
dcc43965928f - A nice cleaner structure for tcp (acceptor) forwarding.
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
234 (struct sockaddr*)&remoteaddr, &remoteaddrlen);
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 if (childsock < 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 /* accept failed */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
241 /* Limit the number of unauthenticated connections per IP */
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
242 remote_addr_str = getaddrstring(&remoteaddr, 0);
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
243
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
244 num_unauthed_for_addr = 0;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
245 num_unauthed_total = 0;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 for (j = 0; j < MAX_UNAUTH_CLIENTS; j++) {
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
247 if (childpipes[j] >= 0) {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
248 num_unauthed_total++;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
249 if (strcmp(remote_addr_str, preauth_addrs[j]) == 0) {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
250 num_unauthed_for_addr++;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
251 }
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
252 } else {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
253 /* a free slot */
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
254 conn_idx = j;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
258 if (num_unauthed_total >= MAX_UNAUTH_CLIENTS
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
259 || num_unauthed_for_addr >= MAX_UNAUTH_PER_IP) {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
260 goto out;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 if (pipe(childpipe) < 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
264 TRACE(("error creating child pipe"))
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
265 goto out;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
268 fork_ret = fork();
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
269 if (fork_ret < 0) {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
270 dropbear_log(LOG_WARNING, "error forking: %s", strerror(errno));
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
271 goto out;
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
272
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
273 } else if (fork_ret > 0) {
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
274
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diff changeset
275 /* parent */
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diff changeset
276 childpipes[conn_idx] = childpipe[0];
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diff changeset
277 m_close(childpipe[1]);
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parents: 258
diff changeset
278 preauth_addrs[conn_idx] = remote_addr_str;
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diff changeset
279 remote_addr_str = NULL;
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diff changeset
280
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parents: 258
diff changeset
281 } else {
30
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282
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283 /* child */
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diff changeset
284 char * addrstring = NULL;
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diff changeset
285 #ifdef DEBUG_FORKGPROF
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diff changeset
286 extern void _start(void), etext(void);
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287 monstartup((u_long)&_start, (u_long)&etext);
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288 #endif /* DEBUG_FORKGPROF */
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289
277
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diff changeset
290 m_free(remote_addr_str);
62
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diff changeset
291 addrstring = getaddrstring(&remoteaddr, 1);
30
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292 dropbear_log(LOG_INFO, "Child connection from %s", addrstring);
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parents:
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293
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diff changeset
294 if (setsid() < 0) {
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295 dropbear_exit("setsid: %s", strerror(errno));
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296 }
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297
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298 /* make sure we close sockets */
277
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diff changeset
299 for (i = 0; i < listensockcount; i++) {
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diff changeset
300 m_close(listensocks[i]);
30
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301 }
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302
277
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diff changeset
303 m_close(childpipe[0]);
30
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304
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305 /* start the session */
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diff changeset
306 svr_session(childsock, childpipe[1],
158
364a75cfebab Log the IP along with auth success/fail attempts
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diff changeset
307 getaddrhostname(&remoteaddr),
364a75cfebab Log the IP along with auth success/fail attempts
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diff changeset
308 addrstring);
30
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309 /* don't return */
241
c5d3ef11155f * use own assertions which should get logged properly
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diff changeset
310 dropbear_assert(0);
30
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311 }
277
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diff changeset
312
044bc108b9b3 * Per-IP connection unauthed connection limits
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diff changeset
313 out:
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diff changeset
314 /* This section is important for the parent too */
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diff changeset
315 m_close(childsock);
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parents: 258
diff changeset
316 if (remote_addr_str) {
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diff changeset
317 m_free(remote_addr_str);
30
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318 }
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319 }
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320 } /* for(;;) loop */
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321
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322 /* don't reach here */
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323 }
71
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diff changeset
324 #endif /* NON_INETD_MODE */
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diff changeset
325
30
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326
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327 /* catch + reap zombie children */
108
10f4d3319780 - added circular buffering for channels
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parents: 101
diff changeset
328 static void sigchld_handler(int UNUSED(unused)) {
30
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parents:
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329 struct sigaction sa_chld;
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330
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331 while(waitpid(-1, NULL, WNOHANG) > 0);
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332
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diff changeset
333 sa_chld.sa_handler = sigchld_handler;
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parents:
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334 sa_chld.sa_flags = SA_NOCLDSTOP;
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parents:
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335 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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diff changeset
336 dropbear_exit("signal() error");
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337 }
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338 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
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339
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diff changeset
340 /* catch any segvs */
108
10f4d3319780 - added circular buffering for channels
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parents: 101
diff changeset
341 static void sigsegv_handler(int UNUSED(unused)) {
30
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342 fprintf(stderr, "Aiee, segfault! You should probably report "
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
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parents:
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343 "this as a bug to the developer\n");
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parents:
diff changeset
344 exit(EXIT_FAILURE);
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parents:
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345 }
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346
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diff changeset
347 /* catch ctrl-c or sigterm */
108
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parents: 101
diff changeset
348 static void sigintterm_handler(int UNUSED(unused)) {
30
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349
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diff changeset
350 exitflag = 1;
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diff changeset
351 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
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352
71
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diff changeset
353 /* Things used by inetd and non-inetd modes */
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parents: 63
diff changeset
354 static void commonsetup() {
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parents: 63
diff changeset
355
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diff changeset
356 struct sigaction sa_chld;
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parents: 63
diff changeset
357 #ifndef DISABLE_SYSLOG
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parents: 63
diff changeset
358 if (svr_opts.usingsyslog) {
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parents: 63
diff changeset
359 startsyslog();
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diff changeset
360 }
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diff changeset
361 #endif
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diff changeset
362
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parents: 63
diff changeset
363 /* set up cleanup handler */
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parents: 63
diff changeset
364 if (signal(SIGINT, sigintterm_handler) == SIG_ERR ||
ac96bc733e71 adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
365 #ifndef DEBUG_VALGRIND
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
366 signal(SIGTERM, sigintterm_handler) == SIG_ERR ||
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
367 #endif
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
368 signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
ac96bc733e71 adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
369 dropbear_exit("signal() error");
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diff changeset
370 }
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parents: 63
diff changeset
371
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parents: 63
diff changeset
372 /* catch and reap zombie children */
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parents: 63
diff changeset
373 sa_chld.sa_handler = sigchld_handler;
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
374 sa_chld.sa_flags = SA_NOCLDSTOP;
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
375 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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parents: 63
diff changeset
376 dropbear_exit("signal() error");
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
377 }
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
378 if (signal(SIGSEGV, sigsegv_handler) == SIG_ERR) {
ac96bc733e71 adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
379 dropbear_exit("signal() error");
ac96bc733e71 adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
380 }
113
775c6cbfe995 Load the hostkeys for inetd too - oops
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
381
775c6cbfe995 Load the hostkeys for inetd too - oops
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
382 /* Now we can setup the hostkeys - needs to be after logging is on,
775c6cbfe995 Load the hostkeys for inetd too - oops
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
383 * otherwise we might end up blatting error messages to the socket */
775c6cbfe995 Load the hostkeys for inetd too - oops
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
384 loadhostkeys();
272
3be7ae2e8dfa Only read /dev/random once when the program starts
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
385
3be7ae2e8dfa Only read /dev/random once when the program starts
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
386 seedrandom();
71
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parents: 63
diff changeset
387 }
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Matt Johnston <matt@ucc.asn.au>
parents: 63
diff changeset
388
30
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389 /* Set up listening sockets for all the requested ports */
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
parents: 258
diff changeset
390 static size_t listensockets(int *sock, size_t sockcount, int *maxfd) {
30
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parents:
diff changeset
391
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 unsigned int i;
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
393 char* errstring = NULL;
277
044bc108b9b3 * Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
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diff changeset
394 size_t sockpos = 0;
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
395 int nsock;
30
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
397 TRACE(("listensockets: %d to try\n", svr_opts.portcount))
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 71
diff changeset
398
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 for (i = 0; i < svr_opts.portcount; i++) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
401 TRACE(("listening on '%s'", svr_opts.ports[i]))
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 71
diff changeset
402
258
306499676384 * add -g (dbclient) and -a (dropbear) options for allowing non-local
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
403 nsock = dropbear_listen("", svr_opts.ports[i], &sock[sockpos],
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
404 sockcount - sockpos,
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
405 &errstring, maxfd);
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
406
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
407 if (nsock < 0) {
101
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 71
diff changeset
408 dropbear_log(LOG_WARNING, "Failed listening on '%s': %s",
72dc22f56858 Change the way we load keys/ports so we don't print error messages into our
Matt Johnston <matt@ucc.asn.au>
parents: 71
diff changeset
409 svr_opts.ports[i], errstring);
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
410 m_free(errstring);
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
411 continue;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
414 sockpos += nsock;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 }
62
20563735e8b5 just checkpointing
Matt Johnston <matt@ucc.asn.au>
parents: 30
diff changeset
417 return sockpos;
30
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418 }