Mercurial > dropbear

annotate cli-main.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents f0a524208d97
children 1d86a58fb52d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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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 #include "dbrandom.h"
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32 #include "crypto_desc.h"
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33 #include "netio.h"
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34 #include "fuzz.h"
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35
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36 #if DROPBEAR_CLI_PROXYCMD
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37 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out);
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38 static void kill_proxy_sighandler(int signo);
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39 #endif
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40
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41 #if defined(DBMULTI_dbclient) || !DROPBEAR_MULTI
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42 #if defined(DBMULTI_dbclient) && DROPBEAR_MULTI
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43 int cli_main(int argc, char ** argv) {
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44 #else
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45 int main(int argc, char ** argv) {
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46 #endif
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47
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48 int sock_in, sock_out;
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49 struct dropbear_progress_connection *progress = NULL;
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50 pid_t proxy_cmd_pid = 0;
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51
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52 _dropbear_exit = cli_dropbear_exit;
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53 _dropbear_log = cli_dropbear_log;
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54
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55 disallow_core();
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56
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57 seedrandom();
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58 crypto_init();
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59
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60 cli_getopts(argc, argv);
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61
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62 #ifndef DISABLE_SYSLOG
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63 if (opts.usingsyslog) {
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64 startsyslog("dbclient");
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65 }
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66 #endif
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67
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68 TRACE(("user='%s' host='%s' port='%s' bind_address='%s' bind_port='%s'", cli_opts.username,
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69 cli_opts.remotehost, cli_opts.remoteport, cli_opts.bind_address, cli_opts.bind_port))
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71 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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72 dropbear_exit("signal() error");
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73 }
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75 #if DROPBEAR_CLI_PROXYCMD
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76 if (cli_opts.proxycmd) {
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77 cli_proxy_cmd(&sock_in, &sock_out, &proxy_cmd_pid);
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78 m_free(cli_opts.proxycmd);
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79 if (signal(SIGINT, kill_proxy_sighandler) == SIG_ERR ||
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80 signal(SIGTERM, kill_proxy_sighandler) == SIG_ERR ||
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81 signal(SIGHUP, kill_proxy_sighandler) == SIG_ERR) {
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82 dropbear_exit("signal() error");
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83 }
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84 } else
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85 #endif
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86 {
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87 progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport,
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88 cli_connected, &ses, cli_opts.bind_address, cli_opts.bind_port);
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89 sock_in = sock_out = -1;
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90 }
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91
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92 cli_session(sock_in, sock_out, progress, proxy_cmd_pid);
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93
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94 /* not reached */
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95 return -1;
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96 }
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97 #endif /* DBMULTI stuff */
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98
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99 static void exec_proxy_cmd(const void *user_data_cmd) {
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100 const char *cmd = user_data_cmd;
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101 char *usershell;
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102
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103 usershell = m_strdup(get_user_shell());
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104 run_shell_command(cmd, ses.maxfd, usershell);
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105 dropbear_exit("Failed to run '%s'\n", cmd);
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106 }
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107
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108 #if DROPBEAR_CLI_PROXYCMD
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109 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out) {
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110 char * ex_cmd = NULL;
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111 size_t ex_cmdlen;
483
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112 int ret;
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113
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114 /* File descriptor "-j &3" */
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115 if (*cli_opts.proxycmd == '&') {
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116 char *p = cli_opts.proxycmd + 1;
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117 int sock = strtoul(p, &p, 10);
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118 /* must be a single number, and not stdin/stdout/stderr */
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119 if (sock > 2 && sock < 1024 && *p == '\0') {
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120 *sock_in = sock;
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121 *sock_out = sock;
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122 return;
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123 }
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124 }
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125
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126 /* Normal proxycommand */
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127
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128 /* So that spawn_command knows which shell to run */
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129 fill_passwd(cli_opts.own_user);
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130
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131 ex_cmdlen = strlen(cli_opts.proxycmd) + 6; /* "exec " + command + '\0' */
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132 ex_cmd = m_malloc(ex_cmdlen);
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133 snprintf(ex_cmd, ex_cmdlen, "exec %s", cli_opts.proxycmd);
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134
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135 ret = spawn_command(exec_proxy_cmd, ex_cmd,
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136 sock_out, sock_in, NULL, pid_out);
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137 m_free(ex_cmd);
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138 if (ret == DROPBEAR_FAILURE) {
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139 dropbear_exit("Failed running proxy command");
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140 *sock_in = *sock_out = -1;
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141 }
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142 }
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143
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144 static void kill_proxy_sighandler(int UNUSED(signo)) {
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145 kill_proxy_command();
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146 _exit(1);
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147 }
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148
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149 #endif /* DROPBEAR_CLI_PROXYCMD */