release/src/router/dropbear/cli-main.c

   1 /*
   2  * Dropbear - a SSH2 server
   3  * SSH client implementation
   4  *
   5  * Copyright (c) 2002,2003 Matt Johnston
   6  * Copyright (c) 2004 by Mihnea Stoenescu
   7  * All rights reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25  * SOFTWARE. */
  26
  27 #include "includes.h"
  28 #include "dbutil.h"
  29 #include "runopts.h"
  30 #include "session.h"
  31
  32 static void cli_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
  33 static void cli_dropbear_log(int priority, const char* format, va_list param);
  34
  35 #ifdef ENABLE_CLI_PROXYCMD
  36 static void cli_proxy_cmd(int *sock_in, int *sock_out);
  37 #endif
  38
  39 #if defined(DBMULTI_dbclient) || !defined(DROPBEAR_MULTI)
  40 #if defined(DBMULTI_dbclient) && defined(DROPBEAR_MULTI)
  41 int cli_main(int argc, char ** argv) {
  42 #else
  43 int main(int argc, char ** argv) {
  44 #endif
  45
  46         int sock_in, sock_out;
  47         char* error = NULL;
  48
  49         _dropbear_exit = cli_dropbear_exit;
  50         _dropbear_log = cli_dropbear_log;
  51
  52         disallow_core();
  53
  54         cli_getopts(argc, argv);
  55
  56         TRACE(("user='%s' host='%s' port='%s'", cli_opts.username,
  57                                 cli_opts.remotehost, cli_opts.remoteport))
  58
  59         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
  60                 dropbear_exit("signal() error");
  61         }
  62
  63 #ifdef ENABLE_CLI_PROXYCMD
  64         if (cli_opts.proxycmd) {
  65                 cli_proxy_cmd(&sock_in, &sock_out);
  66                 m_free(cli_opts.proxycmd);
  67         } else
  68 #endif
  69         {
  70                 int sock = connect_remote(cli_opts.remotehost, cli_opts.remoteport,
  71                                 0, &error);
  72                 sock_in = sock_out = sock;
  73         }
  74
  75         if (sock_in < 0) {
  76                 dropbear_exit("%s", error);
  77         }
  78
  79         cli_session(sock_in, sock_out);
  80
  81         /* not reached */
  82         return -1;
  83 }
  84 #endif /* DBMULTI stuff */
  85
  86 static void cli_dropbear_exit(int exitcode, const char* format, va_list param) {
  87
  88         char fmtbuf[300];
  89
  90         if (!sessinitdone) {
  91                 snprintf(fmtbuf, sizeof(fmtbuf), "Exited: %s",
  92                                 format);
  93         } else {
  94                 snprintf(fmtbuf, sizeof(fmtbuf),
  95                                 "Connection to %s@%s:%s exited: %s",
  96                                 cli_opts.username, cli_opts.remotehost,
  97                                 cli_opts.remoteport, format);
  98         }
  99
 100         /* Do the cleanup first, since then the terminal will be reset */
 101         cli_session_cleanup();
 102         common_session_cleanup();
 103
 104         _dropbear_log(LOG_INFO, fmtbuf, param);
 105
 106         exit(exitcode);
 107 }
 108
 109 static void cli_dropbear_log(int UNUSED(priority),
 110                 const char* format, va_list param) {
 111
 112         char printbuf[1024];
 113
 114         vsnprintf(printbuf, sizeof(printbuf), format, param);
 115
 116         fprintf(stderr, "%s: %s\n", cli_opts.progname, printbuf);
 117
 118 }
 119
 120 static void exec_proxy_cmd(void *user_data_cmd) {
 121         const char *cmd = user_data_cmd;
 122         char *usershell;
 123
 124         usershell = m_strdup(get_user_shell());
 125         run_shell_command(cmd, ses.maxfd, usershell);
 126         dropbear_exit("Failed to run '%s'\n", cmd);
 127 }
 128
 129 #ifdef ENABLE_CLI_PROXYCMD
 130 static void cli_proxy_cmd(int *sock_in, int *sock_out) {
 131         int ret;
 132
 133         fill_passwd(cli_opts.own_user);
 134
 135         ret = spawn_command(exec_proxy_cmd, cli_opts.proxycmd,
 136                         sock_out, sock_in, NULL, NULL);
 137         if (ret == DROPBEAR_FAILURE) {
 138                 dropbear_exit("Failed running proxy command");
 139                 *sock_in = *sock_out = -1;
 140         }
 141 }
 142 #endif // ENABLE_CLI_PROXYCMD