Mercurial > dropbear

annotate svr-main.c @ 41:18eccbfb9641

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added window-size change handling
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Aug 2004 09:41:37 +0000
parents 223b0f5f8dce
children 20563735e8b5
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30
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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, 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 FILE * pidfile;
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57
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58 int childsock;
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59 pid_t childpid;
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60 int childpipe[2];
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61
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62 struct sigaction sa_chld;
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63
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64 _dropbear_exit = svr_dropbear_exit;
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65 _dropbear_log = svr_dropbear_log;
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66
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67 /* get commandline options */
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68 svr_getopts(argc, argv);
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69
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70 /* fork */
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71 if (svr_opts.forkbg) {
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72 int closefds = 0;
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73 #ifndef DEBUG_TRACE
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74 if (!svr_opts.usingsyslog) {
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75 closefds = 1;
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76 }
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77 #endif
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78 if (daemon(0, closefds) < 0) {
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79 dropbear_exit("Failed to create background process: %s",
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80 strerror(errno));
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81 }
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82 }
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83
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84 #ifndef DISABLE_SYSLOG
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85 if (svr_opts.usingsyslog) {
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86 startsyslog();
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87 }
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88 #endif
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89
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90 /* should be done after syslog is working */
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91 if (svr_opts.forkbg) {
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92 dropbear_log(LOG_INFO, "Running in background");
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93 } else {
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94 dropbear_log(LOG_INFO, "Not forking");
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95 }
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96
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97 /* create a PID file so that we can be killed easily */
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98 pidfile = fopen(DROPBEAR_PIDFILE, "w");
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99 if (pidfile) {
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100 fprintf(pidfile, "%d\n", getpid());
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101 fclose(pidfile);
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102 }
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103
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104 /* set up cleanup handler */
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105 if (signal(SIGINT, sigintterm_handler) == SIG_ERR ||
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106 #ifndef DEBUG_VALGRIND
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107 signal(SIGTERM, sigintterm_handler) == SIG_ERR ||
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108 #endif
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109 signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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110 dropbear_exit("signal() error");
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111 }
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112
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113 /* catch and reap zombie children */
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114 sa_chld.sa_handler = sigchld_handler;
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115 sa_chld.sa_flags = SA_NOCLDSTOP;
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116 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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117 dropbear_exit("signal() error");
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118 }
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119 if (signal(SIGSEGV, sigsegv_handler) == SIG_ERR) {
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120 dropbear_exit("signal() error");
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121 }
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122
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123 /* sockets to identify pre-authenticated clients */
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124 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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125 childpipes[i] = -1;
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126 }
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127
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128 /* Set up the listening sockets */
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129 /* XXX XXX ports */
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130 listensockcount = listensockets(listensocks, &maxsock);
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parents:
diff changeset
131
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diff changeset
132 /* incoming connection select loop */
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parents:
diff changeset
133 for(;;) {
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parents:
diff changeset
134
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parents:
diff changeset
135 FD_ZERO(&fds);
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parents:
diff changeset
136
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parents:
diff changeset
137 seltimeout.tv_sec = 60;
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parents:
diff changeset
138 seltimeout.tv_usec = 0;
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parents:
diff changeset
139
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parents:
diff changeset
140 /* listening sockets */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 for (i = 0; i < listensockcount; i++) {
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parents:
diff changeset
142 FD_SET(listensocks[i], &fds);
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parents:
diff changeset
143 }
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parents:
diff changeset
144
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parents:
diff changeset
145 /* pre-authentication clients */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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parents:
diff changeset
147 if (childpipes[i] >= 0) {
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parents:
diff changeset
148 FD_SET(childpipes[i], &fds);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 maxsock = MAX(maxsock, childpipes[i]);
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diff changeset
150 }
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parents:
diff changeset
151 }
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parents:
diff changeset
152
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diff changeset
153 val = select(maxsock+1, &fds, NULL, NULL, &seltimeout);
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diff changeset
154
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 if (exitflag) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 unlink(DROPBEAR_PIDFILE);
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parents:
diff changeset
157 dropbear_exit("Terminated by signal");
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parents:
diff changeset
158 }
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parents:
diff changeset
159
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 if (val == 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 /* timeout reached */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 continue;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 }
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parents:
diff changeset
164
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 if (val < 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 if (errno == EINTR) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 continue;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
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parents:
diff changeset
169 dropbear_exit("Listening socket error");
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parents:
diff changeset
170 }
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parents:
diff changeset
171
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parents:
diff changeset
172 /* close fds which have been authed or closed - auth.c handles
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parents:
diff changeset
173 * closing the auth sockets on success */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) {
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parents:
diff changeset
175 if (childpipes[i] >= 0 && FD_ISSET(childpipes[i], &fds)) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 close(childpipes[i]);
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parents:
diff changeset
177 childpipes[i] = -1;
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parents:
diff changeset
178 }
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parents:
diff changeset
179 }
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parents:
diff changeset
180
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parents:
diff changeset
181 /* handle each socket which has something to say */
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diff changeset
182 for (i = 0; i < listensockcount; i++) {
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parents:
diff changeset
183 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
184 continue;
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parents:
diff changeset
185
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parents:
diff changeset
186 /* child connection XXX - ip6 stuff here */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 remoteaddrlen = sizeof(struct sockaddr_in);
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parents:
diff changeset
188 childsock = accept(listensocks[i], &remoteaddr, &remoteaddrlen);
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parents:
diff changeset
189
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 if (childsock < 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 /* accept failed */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
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parents:
diff changeset
194
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diff changeset
195 /* check for max number of connections not authorised */
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parents:
diff changeset
196 for (j = 0; j < MAX_UNAUTH_CLIENTS; j++) {
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parents:
diff changeset
197 if (childpipes[j] < 0) {
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parents:
diff changeset
198 break;
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parents:
diff changeset
199 }
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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
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 if (j == MAX_UNAUTH_CLIENTS) {
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parents:
diff changeset
203 /* no free connections */
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diff changeset
204 /* TODO - possibly log, though this would be an easy way
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parents:
diff changeset
205 * to fill logs/disk */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 close(childsock);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 if (pipe(childpipe) < 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 TRACE(("error creating child pipe"));
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 close(childsock);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 continue;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 if ((childpid = fork()) == 0) {
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parents:
diff changeset
217
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diff changeset
218 /* child */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
219 char * addrstring = NULL;
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 #ifdef DEBUG_FORKGPROF
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 extern void _start(void), etext(void);
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parents:
diff changeset
222 monstartup((u_long)&_start, (u_long)&etext);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 #endif /* DEBUG_FORKGPROF */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 addrstring = getaddrstring(&remoteaddr);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 dropbear_log(LOG_INFO, "Child connection from %s", addrstring);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 m_free(addrstring);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 if (setsid() < 0) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 dropbear_exit("setsid: %s", strerror(errno));
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 /* make sure we close sockets */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 for (i = 0; i < listensockcount; i++) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 if (m_close(listensocks[i]) == DROPBEAR_FAILURE) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 dropbear_exit("Couldn't close socket");
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 }
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 if (m_close(childpipe[0]) == DROPBEAR_FAILURE) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 dropbear_exit("Couldn't close socket");
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 /* start the session */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 svr_session(childsock, childpipe[1],
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 getaddrhostname(&remoteaddr));
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 /* don't return */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 assert(0);
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 /* parent */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 childpipes[j] = childpipe[0];
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 if (m_close(childpipe[1]) == DROPBEAR_FAILURE
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 || m_close(childsock) == DROPBEAR_FAILURE) {
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 dropbear_exit("Couldn't close socket");
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 }
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 } /* for(;;) loop */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 /* don't reach here */
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 return -1;
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 #endif
223b0f5f8dce Switching to the magical new Makefile, and new dbmulti style
Matt Johnston <matt@ucc.asn.au>
parents:
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264
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265 /* catch + reap zombie children */
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266 static void sigchld_handler(int fish) {
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267 struct sigaction sa_chld;
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268
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269 while(waitpid(-1, NULL, WNOHANG) > 0);
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270
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271 sa_chld.sa_handler = sigchld_handler;
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272 sa_chld.sa_flags = SA_NOCLDSTOP;
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273 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) {
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274 dropbear_exit("signal() error");
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275 }
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276 }
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277
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278 /* catch any segvs */
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279 static void sigsegv_handler(int fish) {
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280 fprintf(stderr, "Aiee, segfault! You should probably report "
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281 "this as a bug to the developer\n");
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282 exit(EXIT_FAILURE);
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283 }
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284
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285 /* catch ctrl-c or sigterm */
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286 static void sigintterm_handler(int fish) {
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287
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288 exitflag = 1;
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289 }
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290
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291 /* Set up listening sockets for all the requested ports */
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292 static int listensockets(int *sock, int *maxfd) {
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293
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294 int listensock; /* listening fd */
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295 struct sockaddr_in listen_addr;
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296 struct linger linger;
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297 unsigned int i;
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298 int val;
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299
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300 for (i = 0; i < svr_opts.portcount; i++) {
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301
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302 /* iterate through all the sockets to listen on */
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303 listensock = socket(PF_INET, SOCK_STREAM, 0);
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304 if (listensock < 0) {
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305 dropbear_exit("Failed to create socket");
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306 }
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307
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308 val = 1;
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309 /* set to reuse, quick timeout */
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310 setsockopt(listensock, SOL_SOCKET, SO_REUSEADDR,
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311 (void*) &val, sizeof(val));
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312 linger.l_onoff = 1;
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313 linger.l_linger = 5;
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314 setsockopt(listensock, SOL_SOCKET, SO_LINGER,
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315 (void*)&linger, sizeof(linger));
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316
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317 /* disable nagle */
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318 setsockopt(listensock, IPPROTO_TCP, TCP_NODELAY,
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319 (void*)&val, sizeof(val));
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320
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321 memset((void*)&listen_addr, 0x0, sizeof(listen_addr));
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322 listen_addr.sin_family = AF_INET;
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323 listen_addr.sin_port = htons(svr_opts.ports[i]);
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324 listen_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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325 memset(&(listen_addr.sin_zero), '\0', 8);
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326
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327 if (bind(listensock, (struct sockaddr *)&listen_addr,
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328 sizeof(listen_addr)) < 0) {
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329 dropbear_exit("Bind failed port %d", svr_opts.ports[i]);
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330 }
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331
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332 /* listen */
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333 if (listen(listensock, 20) < 0) { /* TODO set listen count */
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334 dropbear_exit("Listen failed");
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335 }
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336
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337 /* nonblock */
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338 if (fcntl(listensock, F_SETFL, O_NONBLOCK) < 0) {
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339 dropbear_exit("Failed to set non-blocking");
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340 }
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341
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342 sock[i] = listensock;
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343 *maxfd = MAX(listensock, *maxfd);
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344 }
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345
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346 return svr_opts.portcount;
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347 }