extcap/sshdump.c

   1 /* sshdump.c
   2  * sshdump is extcap tool used to capture data using a remote ssh host
   3  *
   4  * Copyright 2015, Dario Lombardo
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include "config.h"
  14 #define WS_LOG_DOMAIN "sshdump"
  15
  16 #include <extcap/extcap-base.h>
  17 #include <extcap/ssh-base.h>
  18 #include <wsutil/interface.h>
  19 #include <wsutil/file_util.h>
  20 #include <wsutil/strtoi.h>
  21 #include <wsutil/filesystem.h>
  22 #include <wsutil/privileges.h>
  23 #include <wsutil/please_report_bug.h>
  24 #include <wsutil/wslog.h>
  25
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29
  30 #include <cli_main.h>
  31
  32 static char* sshdump_extcap_interface;
  33 #ifdef _WIN32
  34 #define DEFAULT_SSHDUMP_EXTCAP_INTERFACE "sshdump.exe"
  35 #else
  36 #define DEFAULT_SSHDUMP_EXTCAP_INTERFACE "sshdump"
  37 #endif
  38
  39 #define SSHDUMP_VERSION_MAJOR "1"
  40 #define SSHDUMP_VERSION_MINOR "2"
  41 #define SSHDUMP_VERSION_RELEASE "0"
  42
  43 #define SSH_READ_BLOCK_SIZE 256
  44
  45 enum {
  46         EXTCAP_BASE_OPTIONS_ENUM,
  47         OPT_HELP,
  48         OPT_VERSION,
  49         OPT_REMOTE_HOST,
  50         OPT_REMOTE_PORT,
  51         OPT_REMOTE_USERNAME,
  52         OPT_REMOTE_PASSWORD,
  53         OPT_REMOTE_INTERFACE,
  54         OPT_REMOTE_CAPTURE_COMMAND_SELECT,
  55         OPT_REMOTE_CAPTURE_COMMAND,
  56         OPT_REMOTE_FILTER,
  57         OPT_SSHKEY,
  58         OPT_SSHKEY_PASSPHRASE,
  59         OPT_PROXYCOMMAND,
  60         OPT_SSH_SHA1,
  61         OPT_REMOTE_COUNT,
  62         OPT_REMOTE_SUDO,        // Deprecated
  63         OPT_REMOTE_PRIV,
  64         OPT_REMOTE_PRIV_USER,
  65         OPT_REMOTE_NOPROM
  66 };
  67
  68 static const struct ws_option longopts[] = {
  69         EXTCAP_BASE_OPTIONS,
  70         { "help", ws_no_argument, NULL, OPT_HELP},
  71         { "version", ws_no_argument, NULL, OPT_VERSION},
  72         SSH_BASE_OPTIONS,
  73         { "remote-capture-command-select", ws_required_argument, NULL, OPT_REMOTE_CAPTURE_COMMAND_SELECT},
  74         { "remote-capture-command", ws_required_argument, NULL, OPT_REMOTE_CAPTURE_COMMAND},
  75         { "remote-sudo", ws_no_argument, NULL, OPT_REMOTE_SUDO },       // Deprecated
  76         { "remote-priv", ws_required_argument, NULL, OPT_REMOTE_PRIV },
  77         { "remote-priv-user", ws_required_argument, NULL, OPT_REMOTE_PRIV_USER },
  78         { "remote-noprom", ws_no_argument, NULL, OPT_REMOTE_NOPROM },
  79         { 0, 0, 0, 0}
  80 };
  81
  82 static char* interfaces_list_to_filter(GSList* if_list, unsigned int remote_port);
  83
  84 static int ssh_loop_read(ssh_channel channel, FILE* fp)
  85 {
  86         int nbytes;
  87         int ret = EXIT_SUCCESS;
  88         char buffer[SSH_READ_BLOCK_SIZE];
  89
  90         /* read from stdin until data are available */
  91         while (ssh_channel_is_open(channel) && !ssh_channel_is_eof(channel)) {
  92                 nbytes = ssh_channel_read(channel, buffer, SSH_READ_BLOCK_SIZE, 0);
  93                 if (nbytes < 0) {
  94                         ws_warning("Error reading from channel");
  95                         goto end;
  96                 }
  97                 if (nbytes == 0) {
  98                         break;
  99                 }
 100                 if (fwrite(buffer, 1, nbytes, fp) != (unsigned)nbytes) {
 101                         ws_warning("Error writing to fifo");
 102                         ret = EXIT_FAILURE;
 103                         goto end;
 104                 }
 105                 fflush(fp);
 106         }
 107
 108         /* read loop finished... maybe something wrong happened. Read from stderr */
 109         while (ssh_channel_is_open(channel) && !ssh_channel_is_eof(channel)) {
 110                 nbytes = ssh_channel_read(channel, buffer, SSH_READ_BLOCK_SIZE, 1);
 111                 if (nbytes < 0) {
 112                         ws_warning("Error reading from channel");
 113                         goto end;
 114                 }
 115                 if (fwrite(buffer, 1, nbytes, stderr) != (unsigned)nbytes) {
 116                         ws_warning("Error writing to stderr");
 117                         break;
 118                 }
 119         }
 120
 121 end:
 122         if (ssh_channel_send_eof(channel) != SSH_OK) {
 123                 ws_warning("Error sending EOF in ssh channel");
 124                 ret = EXIT_FAILURE;
 125         }
 126         return ret;
 127 }
 128
 129 static char* local_interfaces_to_filter(const uint16_t remote_port)
 130 {
 131         GSList* interfaces = local_interfaces_to_list();
 132         char* filter = interfaces_list_to_filter(interfaces, remote_port);
 133         g_slist_free_full(interfaces, g_free);
 134         return filter;
 135 }
 136
 137 static ssh_channel run_ssh_command(ssh_session sshs, const char* capture_command_select,
 138                 const char* capture_command, const char* privilege, bool noprom,
 139                 const char* iface, const char* cfilter, const uint32_t count)
 140 {
 141         char* cmdline = NULL;
 142         ssh_channel channel;
 143         char** ifaces_array = NULL;
 144         int ifaces_array_num = 0;
 145         GString *ifaces_string;
 146         char *ifaces = NULL;
 147         char* quoted_iface = NULL;
 148         char* quoted_filter = NULL;
 149         char* count_str = NULL;
 150         unsigned int remote_port = 22;
 151
 152         channel = ssh_channel_new(sshs);
 153         if (!channel) {
 154                 ws_warning("Can't create channel");
 155                 return NULL;
 156         }
 157
 158         if (ssh_channel_open_session(channel) != SSH_OK) {
 159                 ws_warning("Can't open session");
 160                 ssh_channel_free(channel);
 161                 return NULL;
 162         }
 163
 164         ssh_options_get_port(sshs, &remote_port);
 165
 166         if (capture_command_select == NULL || !g_strcmp0(capture_command_select, "other")) {
 167                 if (capture_command && *capture_command) {
 168                         cmdline = g_strdup(capture_command);
 169                         ws_debug("Remote capture command has disabled other options");
 170                 } else {
 171                         capture_command_select = "tcpdump";
 172                 }
 173         }
 174
 175         /* escape parameters to go save with the shell */
 176         if (!g_strcmp0(capture_command_select, "tcpdump")) {
 177                 quoted_iface = iface ? g_shell_quote(iface) : NULL;
 178                 quoted_filter = g_shell_quote(cfilter ? cfilter : "");
 179                 if (count > 0)
 180                         count_str = ws_strdup_printf("-c %u", count);
 181
 182                 cmdline = ws_strdup_printf("%s tcpdump -U %s%s %s -w - %s %s",
 183                         privilege,
 184                         quoted_iface ? "-i " : "",
 185                         quoted_iface ? quoted_iface : "",
 186                         noprom ? "-p" : "",
 187                         count_str ? count_str : "",
 188                         quoted_filter);
 189         } else if (!g_strcmp0(capture_command_select, "dumpcap")) {
 190                 if (iface) {
 191                         ifaces_array = g_strsplit(iface, " ", -1);
 192                         ifaces_string = g_string_new(NULL);
 193                         while (ifaces_array[ifaces_array_num])
 194                         {
 195                                 quoted_iface = g_shell_quote(ifaces_array[ifaces_array_num]);
 196                                 g_string_append_printf(ifaces_string, "-i %s ", quoted_iface);
 197                                 ifaces_array_num++;
 198                         }
 199                         ifaces = g_string_free(ifaces_string, FALSE);
 200                 }
 201                 quoted_filter = g_shell_quote(cfilter ? cfilter : "");
 202                 if (count > 0)
 203                         count_str = ws_strdup_printf("-c %u", count);
 204
 205                 cmdline = ws_strdup_printf("%s dumpcap %s %s -w - %s -f %s",
 206                         privilege,
 207                         noprom ? "-p" : "",
 208                         ifaces ? ifaces : "",
 209                         count_str ? count_str : "",
 210                         quoted_filter);
 211
 212                 g_free(ifaces);
 213                 g_strfreev(ifaces_array);
 214         }
 215
 216         ws_debug("Running: %s", cmdline);
 217         if (ssh_channel_request_exec(channel, cmdline) != SSH_OK) {
 218                 ws_warning("Can't request exec");
 219                 ssh_channel_close(channel);
 220                 ssh_channel_free(channel);
 221                 channel = NULL;
 222         }
 223
 224         g_free(quoted_iface);
 225         g_free(quoted_filter);
 226         g_free(cmdline);
 227         g_free(count_str);
 228
 229         return channel;
 230 }
 231
 232 static int ssh_open_remote_connection(const ssh_params_t* params, const char* iface, const char* cfilter,
 233         const char* capture_command_select, const char* capture_command, const char* privilege,
 234         bool noprom, const uint32_t count, const char* fifo)
 235 {
 236         ssh_session sshs = NULL;
 237         ssh_channel channel = NULL;
 238         FILE* fp = stdout;
 239         int ret = EXIT_FAILURE;
 240         char* err_info = NULL;
 241
 242         if (g_strcmp0(fifo, "-")) {
 243                 /* Open or create the output file */
 244                 fp = fopen(fifo, "wb");
 245                 if (fp == NULL) {
 246                         ws_warning("Error creating output file: %s (%s)", fifo, g_strerror(errno));
 247                         return EXIT_FAILURE;
 248                 }
 249         }
 250
 251         sshs = create_ssh_connection(params, &err_info);
 252
 253         if (!sshs) {
 254                 ws_warning("Error creating connection.");
 255                 goto cleanup;
 256         }
 257
 258         channel = run_ssh_command(sshs, capture_command_select, capture_command, privilege, noprom, iface, cfilter, count);
 259
 260         if (!channel) {
 261                 ws_warning("Can't run ssh command.");
 262                 goto cleanup;
 263         }
 264
 265         /* read from channel and write into fp */
 266         if (ssh_loop_read(channel, fp) != EXIT_SUCCESS) {
 267                 ws_warning("Error in read loop.");
 268                 ret = EXIT_FAILURE;
 269                 goto cleanup;
 270         }
 271
 272         ret = EXIT_SUCCESS;
 273 cleanup:
 274         if (err_info)
 275                 ws_warning("%s", err_info);
 276         g_free(err_info);
 277
 278         /* clean up and exit */
 279         ssh_cleanup(&sshs, &channel);
 280
 281         if (g_strcmp0(fifo, "-"))
 282                 fclose(fp);
 283         return ret;
 284 }
 285
 286 static char* interfaces_list_to_filter(GSList* interfaces, unsigned int remote_port)
 287 {
 288         GString* filter = g_string_new(NULL);
 289         GSList* cur;
 290
 291         // If no port is given, assume the default one. This might not be
 292         // correct if the port is looked up from the ssh config file, but it is
 293         // better than nothing.
 294         if (remote_port == 0) {
 295                 remote_port = 22;
 296         }
 297
 298         if (!interfaces) {
 299                 g_string_append_printf(filter, "not port %u", remote_port);
 300         } else {
 301                 g_string_append_printf(filter, "not ((host %s", (char*)interfaces->data);
 302                 cur = g_slist_next(interfaces);
 303                 while (cur) {
 304                         g_string_append_printf(filter, " or host %s", (char*)cur->data);
 305                         cur = g_slist_next(cur);
 306                 }
 307                 g_string_append_printf(filter, ") and port %u)", remote_port);
 308         }
 309         return g_string_free(filter, FALSE);
 310 }
 311
 312 static int list_config(char *interface, unsigned int remote_port)
 313 {
 314         unsigned inc = 0;
 315         char* ipfilter;
 316
 317         if (!interface) {
 318                 ws_warning("ERROR: No interface specified.");
 319                 return EXIT_FAILURE;
 320         }
 321
 322         if (g_strcmp0(interface, sshdump_extcap_interface)) {
 323                 ws_warning("ERROR: interface must be %s", sshdump_extcap_interface);
 324                 return EXIT_FAILURE;
 325         }
 326
 327         ipfilter = local_interfaces_to_filter(remote_port);
 328
 329         printf("arg {number=%u}{call=--remote-host}{display=Remote SSH server address}"
 330                 "{type=string}{tooltip=The remote SSH host. It can be both "
 331                 "an IP address or a hostname}{required=true}{group=Server}\n", inc++);
 332         printf("arg {number=%u}{call=--remote-port}{display=Remote SSH server port}"
 333                 "{type=unsigned}{default=22}{tooltip=The remote SSH host port (1-65535)}"
 334                 "{range=1,65535}{group=Server}\n", inc++);
 335         printf("arg {number=%u}{call=--remote-username}{display=Remote SSH server username}"
 336                 "{type=string}{tooltip=The remote SSH username. If not provided, "
 337                 "the current user will be used}{group=Authentication}\n", inc++);
 338         printf("arg {number=%u}{call=--remote-password}{display=Remote SSH server password}"
 339                 "{type=password}{tooltip=The SSH password, used when other methods (SSH agent "
 340                 "or key files) are unavailable.}{group=Authentication}\n", inc++);
 341         printf("arg {number=%u}{call=--sshkey}{display=Path to SSH private key}"
 342                 "{type=fileselect}{tooltip=The path on the local filesystem of the private SSH key (OpenSSH format)}"
 343                 "{mustexist=true}{group=Authentication}\n", inc++);
 344         printf("arg {number=%u}{call=--sshkey-passphrase}{display=SSH key passphrase}"
 345                 "{type=password}{tooltip=Passphrase to unlock the SSH private key}{group=Authentication}\n",
 346                 inc++);
 347         printf("arg {number=%u}{call=--proxycommand}{display=ProxyCommand}"
 348                 "{type=string}{tooltip=The command to use as proxy for the SSH connection}"
 349                 "{group=Authentication}\n", inc++);
 350         printf("arg {number=%u}{call=--ssh-sha1}{display=Support SHA-1 keys (deprecated)}"
 351                 "{type=boolflag}{tooltip=Support keys and key exchange algorithms using SHA-1 (deprecated)}{group=Authentication}"
 352                 "\n", inc++);
 353         printf("arg {number=%u}{call=--remote-interface}{display=Remote interface}"
 354                 "{type=string}{tooltip=The remote network interface used for capture"
 355                 "}{group=Capture}\n", inc++);
 356         printf("arg {number=%u}{call=--remote-capture-command-select}{display=Remote capture command selection}"
 357                 "{type=radio}{tooltip=The remote capture command to build a command line for}{group=Capture}\n", inc);
 358         printf("value {arg=%u}{value=dumpcap}{display=dumpcap}\n", inc);
 359         printf("value {arg=%u}{value=tcpdump}{display=tcpdump}{default=true}\n", inc);
 360         printf("value {arg=%u}{value=other}{display=Other:}\n", inc++);
 361         printf("arg {number=%u}{call=--remote-capture-command}{display=Remote capture command}"
 362                 "{type=string}{tooltip=The remote command used to capture}{group=Capture}\n", inc++);
 363         // Deprecated
 364         //printf("arg {number=%u}{call=--remote-sudo}{display=Use sudo on the remote machine}"
 365         //      "{type=boolflag}{tooltip=Prepend the capture command with sudo on the remote machine}"
 366         //      "{group=Capture}\n", inc++);
 367         printf("arg {number=%u}{call=--remote-priv}{display=Gain capture privilege on the remote machine}"
 368                 "{type=radio}{tooltip=Optionally prepend the capture command with sudo or doas on the remote machine}"
 369                 "{group=Capture}\n", inc);
 370         printf("value {arg=%u}{value=none}{display=none}{default=true}\n", inc);
 371         printf("value {arg=%u}{value=sudo}{display=sudo}\n", inc);
 372         printf("value {arg=%u}{value=doas -n}{display=doas}\n", inc++);
 373         printf("arg {number=%u}{call=--remote-priv-user}{display=Privileged user name for sudo or doas}"
 374                 "{type=string}{tooltip=User name of privileged user to execute the capture command on the remote machine}"
 375                 "{group=Capture}\n", inc++);
 376         printf("arg {number=%u}{call=--remote-noprom}{display=No promiscuous mode}"
 377                 "{type=boolflag}{tooltip=Don't use promiscuous mode on the remote machine}{group=Capture}"
 378                 "\n", inc++);
 379         printf("arg {number=%u}{call=--remote-filter}{display=Remote capture filter}{type=string}"
 380                 "{tooltip=The remote capture filter}", inc++);
 381         if (ipfilter)
 382                 printf("{default=%s}", ipfilter);
 383         printf("{group=Capture}\n");
 384         printf("arg {number=%u}{call=--remote-count}{display=Packets to capture}"
 385                 "{type=unsigned}{default=0}{tooltip=The number of remote packets to capture. (Default: inf)}"
 386                 "{group=Capture}\n", inc++);
 387
 388         extcap_config_debug(&inc);
 389
 390         g_free(ipfilter);
 391
 392         return EXIT_SUCCESS;
 393 }
 394
 395 static char* concat_filters(const char* extcap_filter, const char* remote_filter)
 396 {
 397         if (!extcap_filter && remote_filter)
 398                 return g_strdup(remote_filter);
 399
 400         if (!remote_filter && extcap_filter)
 401                 return g_strdup(extcap_filter);
 402
 403         if (!remote_filter && !extcap_filter)
 404                 return NULL;
 405
 406         return ws_strdup_printf("(%s) and (%s)", extcap_filter, remote_filter);
 407 }
 408
 409 int main(int argc, char *argv[])
 410 {
 411         char* err_msg;
 412         int result;
 413         int option_idx = 0;
 414         ssh_params_t* ssh_params = ssh_params_new();
 415         char* remote_interface = NULL;
 416         char* remote_capture_command_select = NULL;
 417         char* remote_capture_command = NULL;
 418         char* remote_filter = NULL;
 419         uint32_t count = 0;
 420         int ret = EXIT_FAILURE;
 421         extcap_parameters* extcap_conf = g_new0(extcap_parameters, 1);
 422         char* help_url;
 423         char* help_header = NULL;
 424         char* priv = NULL;
 425         char* priv_user = NULL;
 426         bool noprom = false;
 427         char* interface_description = g_strdup("SSH remote capture");
 428
 429         /* Initialize log handler early so we can have proper logging during startup. */
 430         extcap_log_init("sshdump");
 431
 432         sshdump_extcap_interface = g_path_get_basename(argv[0]);
 433
 434         /*
 435          * Get credential information for later use.
 436          */
 437         init_process_policies();
 438
 439         /*
 440          * Attempt to get the pathname of the directory containing the
 441          * executable file.
 442          */
 443         err_msg = configuration_init(argv[0], NULL);
 444         if (err_msg != NULL) {
 445                 ws_warning("Can't get pathname of directory containing the extcap program: %s.",
 446                         err_msg);
 447                 g_free(err_msg);
 448         }
 449
 450         help_url = data_file_url("sshdump.html");
 451         extcap_base_set_util_info(extcap_conf, argv[0], SSHDUMP_VERSION_MAJOR, SSHDUMP_VERSION_MINOR,
 452                 SSHDUMP_VERSION_RELEASE, help_url);
 453         g_free(help_url);
 454         add_libssh_info(extcap_conf);
 455         if (g_strcmp0(sshdump_extcap_interface, DEFAULT_SSHDUMP_EXTCAP_INTERFACE)) {
 456                 char* temp = interface_description;
 457                 interface_description = ws_strdup_printf("%s, custom version", interface_description);
 458                 g_free(temp);
 459         }
 460         extcap_base_register_interface(extcap_conf, sshdump_extcap_interface, interface_description, 147, "Remote capture dependent DLT");
 461         g_free(interface_description);
 462
 463         help_header = ws_strdup_printf(
 464                 " %s --extcap-interfaces\n"
 465                 " %s --extcap-interface=%s --extcap-dlts\n"
 466                 " %s --extcap-interface=%s --extcap-config\n"
 467                 " %s --extcap-interface=%s --remote-host myhost --remote-port 22222 "
 468                 "--remote-username myuser --remote-interface eth2 --remote-capture-command 'tcpdump -U -i eth0 -w -' "
 469                 "--fifo=FILENAME --capture\n", argv[0], argv[0], sshdump_extcap_interface, argv[0],
 470                 sshdump_extcap_interface, argv[0], sshdump_extcap_interface);
 471         extcap_help_add_header(extcap_conf, help_header);
 472         g_free(help_header);
 473         extcap_help_add_option(extcap_conf, "--help", "print this help");
 474         extcap_help_add_option(extcap_conf, "--version", "print the version");
 475         extcap_help_add_option(extcap_conf, "--remote-host <host>", "the remote SSH host");
 476         extcap_help_add_option(extcap_conf, "--remote-port <port>", "the remote SSH port");
 477         extcap_help_add_option(extcap_conf, "--remote-username <username>", "the remote SSH username");
 478         extcap_help_add_option(extcap_conf, "--remote-password <password>", "the remote SSH password. If not specified, ssh-agent and ssh-key are used");
 479         extcap_help_add_option(extcap_conf, "--sshkey <private key path>", "the path of the SSH key (OpenSSH format)");
 480         extcap_help_add_option(extcap_conf, "--sshkey-passphrase <private key passphrase>", "the passphrase to unlock private SSH key");
 481         extcap_help_add_option(extcap_conf, "--proxycommand <proxy command>", "the command to use as proxy for the SSH connection");
 482         extcap_help_add_option(extcap_conf, "--ssh-sha1", "support keys and key exchange using SHA-1 (deprecated)");
 483         extcap_help_add_option(extcap_conf, "--remote-interface <iface>", "the remote capture interface");
 484         extcap_help_add_option(extcap_conf, "--remote-capture-command-select <selection>", "dumpcap, tcpdump or other remote capture command");
 485         extcap_help_add_option(extcap_conf, "--remote-capture-command <capture command>", "the remote capture command");
 486         //extcap_help_add_option(extcap_conf, "--remote-sudo", "use sudo on the remote machine to capture");    // Deprecated
 487         extcap_help_add_option(extcap_conf, "--remote-priv <selection>", "none, sudo or doas");
 488         extcap_help_add_option(extcap_conf, "--remote-priv-user <username>", "privileged user name");
 489         extcap_help_add_option(extcap_conf, "--remote-noprom", "don't use promiscuous mode on the remote machine");
 490         extcap_help_add_option(extcap_conf, "--remote-filter <filter>", "a filter for remote capture (default: don't listen on local interfaces IPs)");
 491         extcap_help_add_option(extcap_conf, "--remote-count <count>", "the number of packets to capture");
 492
 493         ws_opterr = 0;
 494         ws_optind = 0;
 495
 496         if (argc == 1) {
 497                 extcap_help_print(extcap_conf);
 498                 goto end;
 499         }
 500
 501         while ((result = ws_getopt_long(argc, argv, ":", longopts, &option_idx)) != -1) {
 502
 503                 switch (result) {
 504
 505                 case OPT_HELP:
 506                         extcap_help_print(extcap_conf);
 507                         ret = EXIT_SUCCESS;
 508                         goto end;
 509
 510                 case OPT_VERSION:
 511                         extcap_version_print(extcap_conf);
 512                         ret = EXIT_SUCCESS;
 513                         goto end;
 514
 515                 case OPT_REMOTE_HOST:
 516                         g_free(ssh_params->host);
 517                         ssh_params->host = g_strdup(ws_optarg);
 518                         break;
 519
 520                 case OPT_REMOTE_PORT:
 521                         if (!ws_strtou16(ws_optarg, NULL, &ssh_params->port) || ssh_params->port == 0) {
 522                                 ws_warning("Invalid port: %s", ws_optarg);
 523                                 goto end;
 524                         }
 525                         break;
 526
 527                 case OPT_REMOTE_USERNAME:
 528                         g_free(ssh_params->username);
 529                         ssh_params->username = g_strdup(ws_optarg);
 530                         break;
 531
 532                 case OPT_REMOTE_PASSWORD:
 533                         g_free(ssh_params->password);
 534                         ssh_params->password = g_strdup(ws_optarg);
 535                         memset(ws_optarg, 'X', strlen(ws_optarg));
 536                         break;
 537
 538                 case OPT_SSHKEY:
 539                         g_free(ssh_params->sshkey_path);
 540                         ssh_params->sshkey_path = g_strdup(ws_optarg);
 541                         break;
 542
 543                 case OPT_SSHKEY_PASSPHRASE:
 544                         g_free(ssh_params->sshkey_passphrase);
 545                         ssh_params->sshkey_passphrase = g_strdup(ws_optarg);
 546                         memset(ws_optarg, 'X', strlen(ws_optarg));
 547                         break;
 548
 549                 case OPT_PROXYCOMMAND:
 550                         g_free(ssh_params->proxycommand);
 551                         ssh_params->proxycommand = g_strdup(ws_optarg);
 552                         break;
 553
 554                 case OPT_SSH_SHA1:
 555                         ssh_params->ssh_sha1 = true;
 556                         break;
 557
 558                 case OPT_REMOTE_INTERFACE:
 559                         g_free(remote_interface);
 560                         remote_interface = g_strdup(ws_optarg);
 561                         break;
 562
 563                 case OPT_REMOTE_CAPTURE_COMMAND_SELECT:
 564                         g_free(remote_capture_command_select);
 565                         remote_capture_command_select = g_strdup(ws_optarg);
 566                         break;
 567
 568                 case OPT_REMOTE_CAPTURE_COMMAND:
 569                         g_free(remote_capture_command);
 570                         remote_capture_command = g_strdup(ws_optarg);
 571                         break;
 572
 573                 case OPT_REMOTE_SUDO:
 574                         // Deprecated
 575                         g_free(priv);
 576                         priv = g_strdup("sudo");
 577                         break;
 578
 579                 case OPT_REMOTE_PRIV:
 580                         g_free(priv);
 581                         priv = g_strdup(ws_optarg);
 582                         break;
 583
 584                 case OPT_REMOTE_PRIV_USER:
 585                         g_free(priv_user);
 586                         priv_user = g_strdup(ws_optarg);
 587                         break;
 588
 589                 case OPT_REMOTE_FILTER:
 590                         g_free(remote_filter);
 591                         remote_filter = g_strdup(ws_optarg);
 592                         break;
 593
 594                 case OPT_REMOTE_COUNT:
 595                         if (!ws_strtou32(ws_optarg, NULL, &count)) {
 596                                 ws_warning("Invalid value for count: %s", ws_optarg);
 597                                 goto end;
 598                         }
 599                         break;
 600
 601                 case OPT_REMOTE_NOPROM:
 602                         noprom = true;
 603                         break;
 604
 605                 case ':':
 606                         /* missing option argument */
 607                         ws_warning("Option '%s' requires an argument", argv[ws_optind - 1]);
 608                         break;
 609
 610                 default:
 611                         if (!extcap_base_parse_options(extcap_conf, result - EXTCAP_OPT_LIST_INTERFACES, ws_optarg)) {
 612                                 ws_warning("Invalid option: %s", argv[ws_optind - 1]);
 613                                 goto end;
 614                         }
 615                 }
 616         }
 617
 618         extcap_cmdline_debug(argv, argc);
 619
 620         if (extcap_base_handle_interface(extcap_conf)) {
 621                 ret = EXIT_SUCCESS;
 622                 goto end;
 623         }
 624
 625         if (extcap_conf->show_config) {
 626                 ret = list_config(extcap_conf->interface, ssh_params->port);
 627                 goto end;
 628         }
 629
 630         err_msg = ws_init_sockets();
 631         if (err_msg != NULL) {
 632                 ws_warning("ERROR: %s", err_msg);
 633                 g_free(err_msg);
 634                 ws_warning("%s", please_report_bug());
 635                 goto end;
 636         }
 637
 638         if (extcap_conf->capture) {
 639                 char* filter;
 640                 char* privilege;
 641
 642                 if (!ssh_params->host) {
 643                         ws_warning("Missing parameter: --remote-host");
 644                         goto end;
 645                 }
 646
 647                 if ((priv) && g_strcmp0(priv, "none") && strlen(g_strstrip(priv))) {
 648                         if ((priv_user) && strlen(g_strstrip(priv_user)))
 649                                 /* Both sudo and doas use the same command line option */
 650                                 privilege = g_strconcat(priv, " -u ", priv_user, NULL);
 651                         else
 652                                 privilege = g_strdup(priv);
 653                 } else {
 654                         privilege = g_strdup("");
 655                 }
 656
 657                 // This may result in the use of a different port number than was given in
 658                 // the default filter string, as presented in the config dialog. The default
 659                 // given is always using the default SSH port since there's no remote SSH port
 660                 // given on the command line to get the extcap arguments.
 661                 // However the remote SSH port used here is the one given on the command line
 662                 // when the capture us started, which is the intended one.
 663                 // And this is only happening when no remote filter is specified on the command
 664                 // line to start the capture.
 665                 if (remote_filter == NULL)
 666                         remote_filter = local_interfaces_to_filter(ssh_params->port);
 667                 filter = concat_filters(extcap_conf->capture_filter, remote_filter);
 668                 ssh_params_set_log_level(ssh_params, extcap_conf->debug);
 669                 ret = ssh_open_remote_connection(ssh_params, remote_interface,
 670                         filter, remote_capture_command_select, remote_capture_command,
 671                         privilege, noprom, count, extcap_conf->fifo);
 672                 g_free(filter);
 673                 g_free(privilege);
 674         } else {
 675                 ws_debug("You should not come here... maybe some parameter missing?");
 676                 ret = EXIT_FAILURE;
 677         }
 678
 679 end:
 680         /* clean up stuff */
 681         ssh_params_free(ssh_params);
 682         g_free(remote_capture_command_select);
 683         g_free(remote_capture_command);
 684         g_free(remote_interface);
 685         g_free(remote_filter);
 686         g_free(priv);
 687         g_free(priv_user);
 688         extcap_base_cleanup(&extcap_conf);
 689         return ret;
 690 }
 691
 692 /*
 693  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 694  *
 695  * Local variables:
 696  * c-basic-offset: 8
 697  * tab-width: 8
 698  * indent-tabs-mode: t
 699  * End:
 700  *
 701  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 702  * :indentSize=8:tabSize=8:noTabs=false:
 703  */