Mercurial > dropbear

annotate cli-main.c @ 735:73b6e5d8801b

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Fix segfault when /dev/urandom isn't writable
author Matt Johnston <matt@ucc.asn.au>
date Tue, 02 Apr 2013 18:53:18 +0800
parents 70811267715c
children 7dcb46da72d9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
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1 /*
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2 * Dropbear - a SSH2 server
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3 * SSH client implementation
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4 *
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5 * Copyright (c) 2002,2003 Matt Johnston
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6 * Copyright (c) 2004 by Mihnea Stoenescu
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7 * All rights reserved.
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8 *
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9 * Permission is hereby granted, free of charge, to any person obtaining a copy
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10 * of this software and associated documentation files (the "Software"), to deal
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11 * in the Software without restriction, including without limitation the rights
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12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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13 * copies of the Software, and to permit persons to whom the Software is
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14 * furnished to do so, subject to the following conditions:
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15 *
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16 * The above copyright notice and this permission notice shall be included in
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17 * all copies or substantial portions of the Software.
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18 *
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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25 * SOFTWARE. */
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26
33
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27 #include "includes.h"
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28 #include "dbutil.h"
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29 #include "runopts.h"
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30 #include "session.h"
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31
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32 static void cli_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
33
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33 static void cli_dropbear_log(int priority, const char* format, va_list param);
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34
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35 #ifdef ENABLE_CLI_PROXYCMD
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36 static void cli_proxy_cmd(int *sock_in, int *sock_out);
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37 #endif
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38
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39 #if defined(DBMULTI_dbclient) || !defined(DROPBEAR_MULTI)
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40 #if defined(DBMULTI_dbclient) && defined(DROPBEAR_MULTI)
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41 int cli_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 int sock_in, sock_out;
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47 char* error = NULL;
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48
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49 _dropbear_exit = cli_dropbear_exit;
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50 _dropbear_log = cli_dropbear_log;
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51
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52 disallow_core();
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53
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54 cli_getopts(argc, argv);
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55
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56 TRACE(("user='%s' host='%s' port='%s'", cli_opts.username,
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57 cli_opts.remotehost, cli_opts.remoteport))
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58
109
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59 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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60 dropbear_exit("signal() error");
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61 }
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62
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63 #ifdef ENABLE_CLI_PROXYCMD
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64 if (cli_opts.proxycmd) {
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65 cli_proxy_cmd(&sock_in, &sock_out);
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66 m_free(cli_opts.proxycmd);
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67 } else
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68 #endif
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69 {
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70 int sock = connect_remote(cli_opts.remotehost, cli_opts.remoteport,
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71 0, &error);
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72 sock_in = sock_out = sock;
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73 }
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74
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75 if (sock_in < 0) {
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76 dropbear_exit("%s", error);
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77 }
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78
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79 cli_session(sock_in, sock_out);
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80
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81 /* not reached */
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82 return -1;
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83 }
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84 #endif /* DBMULTI stuff */
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85
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86 static void cli_dropbear_exit(int exitcode, const char* format, va_list param) {
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87
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88 char fmtbuf[300];
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89
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90 if (!sessinitdone) {
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91 snprintf(fmtbuf, sizeof(fmtbuf), "Exited: %s",
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92 format);
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93 } else {
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94 snprintf(fmtbuf, sizeof(fmtbuf),
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95 "Connection to %s@%s:%s exited: %s",
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96 cli_opts.username, cli_opts.remotehost,
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97 cli_opts.remoteport, format);
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98 }
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99
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100 /* Do the cleanup first, since then the terminal will be reset */
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101 session_cleanup();
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102
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103 _dropbear_log(LOG_INFO, fmtbuf, param);
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104
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105 exit(exitcode);
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106 }
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107
108
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108 static void cli_dropbear_log(int UNUSED(priority),
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109 const char* format, va_list param) {
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110
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111 char printbuf[1024];
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112
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113 vsnprintf(printbuf, sizeof(printbuf), format, param);
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114
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115 fprintf(stderr, "%s: %s\n", cli_opts.progname, printbuf);
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116
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117 }
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118
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119 static void exec_proxy_cmd(void *user_data_cmd) {
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120 const char *cmd = user_data_cmd;
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121 char *usershell;
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122
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123 usershell = m_strdup(get_user_shell());
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124 run_shell_command(cmd, ses.maxfd, usershell);
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125 dropbear_exit("Failed to run '%s'\n", cmd);
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126 }
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127
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128 #ifdef ENABLE_CLI_PROXYCMD
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129 static void cli_proxy_cmd(int *sock_in, int *sock_out) {
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130 int ret;
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131
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132 fill_passwd(cli_opts.own_user);
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133
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134 ret = spawn_command(exec_proxy_cmd, cli_opts.proxycmd,
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135 sock_out, sock_in, NULL, NULL);
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diff changeset
136 if (ret == DROPBEAR_FAILURE) {
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
137 dropbear_exit("Failed running proxy command");
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
138 *sock_in = *sock_out = -1;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
139 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
140 }
542
c9128994a2d6 Wrap proxycmd function in ENABLE_CLI_PROXYCMD #ifdef
Matt Johnston <matt@ucc.asn.au>
parents: 484
diff changeset
141 #endif // ENABLE_CLI_PROXYCMD