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This commit is contained in:
Přemysl Eric Janouch 2014-09-12 23:28:33 +02:00
parent a133946688
commit 1bc2e22167
2 changed files with 330 additions and 118 deletions
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445
ponymap.c
View File

@ -25,8 +25,12 @@
// --- Configuration (application-specific) ------------------------------------
#define DEFAULT_CONNECT_TIMEOUT 10
#define DEFAULT_SCAN_TIMEOUT 10
static struct config_item g_config_table[] =
{
// TODO: set the default to the installation directory
{ "plugin_dir", NULL, "Where to search for plugins" },
{ NULL, NULL, NULL }
};
@ -71,20 +75,18 @@ struct target
{
LIST_HEADER (target)
size_t ref_count; ///< Reference count
struct app_context *ctx; ///< Application context
uint32_t ip; ///< IP address
char *hostname; ///< Hostname
struct unit *running_units; ///< All the currently running units
// TODO: some fields with results
// XXX: what is the relation to `struct unit'?
};
// TODO: actually use this
enum transport_io_result
{
TRANSPORT_IO_OK, ///< Completed successfully
TRANSPORT_IO_OK = 0, ///< Completed successfully
TRANSPORT_IO_EOF, ///< Connection shut down by peer
TRANSPORT_IO_ERROR ///< Connection error
};
@ -103,16 +105,17 @@ struct transport
/// The underlying socket may have become readable, update `read_buffer';
/// return false if the connection has failed.
bool (*on_readable) (struct unit *u);
enum transport_io_result (*on_readable) (struct unit *u);
/// The underlying socket may have become writeable, flush `write_buffer';
/// return false if the connection has failed.
bool (*on_writeable) (struct unit *u);
enum transport_io_result (*on_writeable) (struct unit *u);
/// Return event mask to use for the poller
int (*get_poll_events) (struct unit *u);
};
struct unit
{
LIST_HEADER (unit)
struct target *target; ///< Target context
struct service *service; ///< Service
@ -168,6 +171,8 @@ struct job_generator
struct app_context
{
struct str_map config; ///< User configuration
unsigned connect_timeout; ///< Hard timeout for connect()
unsigned scan_timeout; ///< Hard timeout for service scans
struct str_map svc_list; ///< List of services to scan for
struct port_range *port_list; ///< List of ports to scan on
@ -179,7 +184,7 @@ struct app_context
SSL_CTX *ssl_ctx; ///< OpenSSL context
#if 0
struct target *running_list; ///< List of currently scanned targets
struct target *running_targets; ///< List of currently scanned targets
#endif
struct poller poller; ///< Manages polled descriptors
bool quitting; ///< User requested quitting
@ -195,6 +200,9 @@ app_context_init (struct app_context *self)
self->config.free = free;
load_config_defaults (&self->config, g_config_table);
self->connect_timeout = DEFAULT_CONNECT_TIMEOUT;
self->scan_timeout = DEFAULT_SCAN_TIMEOUT;
str_map_init (&self->svc_list);
str_map_init (&self->services);
// Ignoring the generator so far
@ -231,22 +239,7 @@ app_context_free (struct app_context *self)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
try_finish_quit (struct app_context *ctx)
{
if (ctx->quitting)
ctx->polling = false;
}
static void
initiate_quit (struct app_context *ctx)
{
ctx->quitting = true;
try_finish_quit (ctx);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void target_unref (struct target *self);
static void on_unit_ready (const struct pollfd *pfd, struct unit *u);
static void
@ -260,32 +253,77 @@ unit_update_poller (struct unit *u, const struct pollfd *pfd)
(poller_dispatcher_func) on_unit_ready, u);
}
static void
unit_abort (struct unit *u)
{
if (u->aborted)
return;
u->aborted = true;
u->service->on_aborted (u->service_data, u);
}
static void
unit_destroy (struct unit *u)
{
LIST_UNLINK (u->target->running_units, u);
target_unref (u->target);
// TODO: transfer the results?
free (u);
}
static void
on_unit_ready (const struct pollfd *pfd, struct unit *u)
{
struct transport *transport = u->transport;
struct service *service = u->service;
enum transport_io_result result;
if (!transport->on_readable (u))
; // TODO: cancel the unit
if ((result = transport->on_readable (u)))
goto exception;
if (u->read_buffer.len)
{
struct str *buf = &u->read_buffer;
service->on_data (u->service_data, u, buf);
str_remove_slice (buf, 0, buf->len);
if (u->aborted)
return;
}
// TODO: check if the unit has been aborted?
if (!transport->on_writeable (u))
; // TODO: cancel the unit
if (!(result = transport->on_writeable (u)))
{
if (!u->aborted)
unit_update_poller (u, pfd);
return;
}
unit_update_poller (u, pfd);
return;
exception:
if (result == TRANSPORT_IO_EOF)
service->on_eof (u->service_data, u);
else if (result == TRANSPORT_IO_ERROR)
service->on_error (u->service_data, u);
abort:
// TODO: move to a function, guard against `aborted' in the API
u->aborted = true;
service->on_aborted (u->service_data, u);
unit_abort (u);
unit_destroy (u);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
try_finish_quit (struct app_context *ctx)
{
if (ctx->quitting)
ctx->polling = false;
}
static void
initiate_quit (struct app_context *ctx)
{
ctx->quitting = true;
// TODO: abort and kill all units
try_finish_quit (ctx);
}
// --- Signals -----------------------------------------------------------------
@ -372,7 +410,7 @@ plugin_api_unit_add_info (struct unit *u, const char *result)
static void
plugin_api_unit_abort (struct unit *u)
{
// TODO
unit_abort (u);
}
static struct plugin_api g_plugin_vtable =
@ -473,7 +511,7 @@ transport_plain_cleanup (struct unit *u)
(void) u;
}
static bool
static enum transport_io_result
transport_plain_on_readable (struct unit *u)
{
struct str *buf = &u->read_buffer;
@ -491,21 +529,19 @@ transport_plain_on_readable (struct unit *u)
continue;
}
if (n_read == 0)
// TODO: service->on_eof()
return false;
return TRANSPORT_IO_EOF;
if (errno == EAGAIN)
return true;
return TRANSPORT_IO_OK;
if (errno == EINTR)
continue;
// TODO: service->on_error()
print_debug ("%s: %s: %s", __func__, "recv", strerror (errno));
return false;
return TRANSPORT_IO_ERROR;
}
}
static bool
static enum transport_io_result
transport_plain_on_writeable (struct unit *u)
{
struct str *buf = &u->write_buffer;
@ -521,15 +557,14 @@ transport_plain_on_writeable (struct unit *u)
}
if (errno == EAGAIN)
return true;
return TRANSPORT_IO_OK;
if (errno == EINTR)
continue;
// TODO: service->on_error()
print_debug ("%s: %s: %s", __func__, "send", strerror (errno));
return false;
return TRANSPORT_IO_ERROR;
}
return true;
return TRANSPORT_IO_OK;
}
static int
@ -588,12 +623,12 @@ transport_tls_cleanup (struct unit *u)
free (data);
}
static bool
static enum transport_io_result
transport_tls_on_readable (struct unit *u)
{
struct transport_tls_data *data = u->transport_data;
if (data->ssl_tx_want_rx)
return true;
return TRANSPORT_IO_OK;
struct str *buf = &u->read_buffer;
data->ssl_rx_want_tx = false;
@ -610,8 +645,7 @@ transport_tls_on_readable (struct unit *u)
buf->str[buf->len += n_read] = '\0';
continue;
case SSL_ERROR_ZERO_RETURN:
// TODO: service->on_eof()
return false;
return TRANSPORT_IO_EOF;
case SSL_ERROR_WANT_READ:
return true;
case SSL_ERROR_WANT_WRITE:
@ -621,18 +655,17 @@ transport_tls_on_readable (struct unit *u)
continue;
default:
print_debug ("%s: %s: %s", __func__, "SSL_read", error_info);
// TODO: service->on_error()
return false;
return TRANSPORT_IO_ERROR;
}
}
}
static bool
static enum transport_io_result
transport_tls_on_writeable (struct unit *u)
{
struct transport_tls_data *data = u->transport_data;
if (data->ssl_rx_want_tx)
return true;
return TRANSPORT_IO_OK;
struct str *buf = &u->write_buffer;
data->ssl_tx_want_rx = false;
@ -647,22 +680,20 @@ transport_tls_on_writeable (struct unit *u)
str_remove_slice (buf, 0, n_written);
continue;
case SSL_ERROR_ZERO_RETURN:
// TODO: service->on_eof()
return false;
return TRANSPORT_IO_EOF;
case SSL_ERROR_WANT_WRITE:
return true;
return TRANSPORT_IO_OK;
case SSL_ERROR_WANT_READ:
data->ssl_tx_want_rx = true;
return true;
return TRANSPORT_IO_OK;
case XSSL_ERROR_TRY_AGAIN:
continue;
default:
print_debug ("%s: %s: %s", __func__, "SSL_write", error_info);
// TODO: service->on_error()
return false;
return TRANSPORT_IO_ERROR;
}
}
return true;
return TRANSPORT_IO_OK;
}
static int
@ -718,6 +749,9 @@ target_unref (struct target *self)
if (!self || --self->ref_count)
return;
// TODO: present the results; if we've been interrupted by the user,
// say that they're only partial
free (self->hostname);
free (self);
}
@ -756,6 +790,15 @@ job_generator_init (struct app_context *ctx)
g->transport_iter = ctx->transports;
}
static void
on_unit_connected (const struct pollfd *pfd, struct unit *u)
{
// TODO: we haven't received the connect event
// -> reset the connect timer
// -> set the scan timer
unit_update_poller (u, NULL);
}
static bool
job_generator_run (struct app_context *ctx, uint32_t ip, uint16_t port,
struct service *service, struct transport *transport)
@ -768,11 +811,16 @@ job_generator_run (struct app_context *ctx, uint32_t ip, uint16_t port,
addr.sin_addr.s_addr = htonl (ip);
addr.sin_port = htons (port);
if (connect (sockfd, (struct sockaddr *) &addr, sizeof addr))
bool established;
if (!connect (sockfd, (struct sockaddr *) &addr, sizeof addr))
established = true;
else if (errno == EINPROGRESS)
established = false;
else
return false;
struct unit *u = xcalloc (1, sizeof *u);
// TODO: set a timer for timeout
// TODO: set a timer for timeout: established ? scan : connect
// Initialize the service
u->service = service;
@ -781,10 +829,18 @@ job_generator_run (struct app_context *ctx, uint32_t ip, uint16_t port,
// Initialize the transport
u->transport = transport;
if (!transport->init (u))
// TODO: cleanup
{
xclose (sockfd);
service->scan_free (u->service_data);
free (u);
return false;
}
unit_update_poller (u, NULL);
if (established)
unit_update_poller (u, NULL);
else
poller_set (&u->target->ctx->poller, u->socket_fd, POLLOUT,
(poller_dispatcher_func) on_unit_connected, u);
return true;
}
@ -851,6 +907,154 @@ job_generator_step (struct app_context *ctx)
return false;
}
// --- Option handler ----------------------------------------------------------
// Simple wrapper for the getopt_long API to make it easier to use and maintain.
#define OPT_USAGE_ALIGNMENT_COLUMN 30 ///< Alignment for option descriptions
enum
{
OPT_OPTIONAL_ARG = (1 << 0), ///< The argument is optional
OPT_LONG_ONLY = (1 << 1) ///< Ignore the short name in opt_string
};
// All options need to have both a short name, and a long name. The short name
// is what is returned from opt_handler_get(). It is possible to define a value
// completely out of the character range combined with the OPT_LONG_ONLY flag.
//
// When `arg_hint' is defined, the option is assumed to have an argument.
struct opt
{
int short_name; ///< The single-letter name
const char *long_name; ///< The long name
const char *arg_hint; ///< Option argument hint
int flags; ///< Option flags
const char *description; ///< Option description
};
struct opt_handler
{
int argc; ///< The number of program arguments
char **argv; ///< Program arguments
const char *arg_hint; ///< Program arguments hint
const char *description; ///< Description of the program
const struct opt *opts; ///< The list of options
size_t opts_len; ///< The length of the option array
struct option *options; ///< The list of options for getopt
char *opt_string; ///< The `optstring' for getopt
};
static void
opt_handler_free (struct opt_handler *self)
{
free (self->options);
free (self->opt_string);
}
static void
opt_handler_init (struct opt_handler *self, int argc, char **argv,
const struct opt *opts, const char *arg_hint, const char *description)
{
memset (self, 0, sizeof *self);
self->argc = argc;
self->argv = argv;
self->arg_hint = arg_hint;
self->description = description;
size_t len = 0;
for (const struct opt *iter = opts; iter->long_name; iter++)
len++;
self->opts = opts;
self->opts_len = len;
self->options = xcalloc (len + 1, sizeof *self->options);
struct str opt_string;
str_init (&opt_string);
for (size_t i = 0; i < len; i++)
{
const struct opt *opt = opts + i;
struct option *mapped = self->options + i;
mapped->name = opt->long_name;
if (!opt->arg_hint)
mapped->has_arg = no_argument;
else if (opt->flags & OPT_OPTIONAL_ARG)
mapped->has_arg = optional_argument;
else
mapped->has_arg = required_argument;
mapped->val = opt->short_name;
if (opt->flags & OPT_LONG_ONLY)
continue;
str_append_c (&opt_string, opt->short_name);
if (opt->arg_hint)
{
str_append_c (&opt_string, ':');
if (opt->flags & OPT_OPTIONAL_ARG)
str_append_c (&opt_string, ':');
}
}
self->opt_string = str_steal (&opt_string);
}
static void
opt_handler_usage (struct opt_handler *self)
{
struct str usage;
str_init (&usage);
str_append_printf (&usage, "Usage: %s [OPTION]... %s\n",
self->argv[0], self->arg_hint ? self->arg_hint : "");
str_append_printf (&usage, "%s\n\n", self->description);
for (size_t i = 0; i < self->opts_len; i++)
{
struct str row;
str_init (&row);
const struct opt *opt = self->opts + i;
if (!(opt->flags & OPT_LONG_ONLY))
str_append_printf (&row, " -%c, ", opt->short_name);
else
str_append (&row, " ");
str_append_printf (&row, "--%s", opt->long_name);
if (opt->arg_hint)
str_append_printf (&row, (opt->flags & OPT_OPTIONAL_ARG)
? " [%s]" : " %s", opt->arg_hint);
if (row.len + 2 <= OPT_USAGE_ALIGNMENT_COLUMN)
{
str_append (&row, " ");
str_append_printf (&usage, "%-*s%s\n",
OPT_USAGE_ALIGNMENT_COLUMN, row.str, opt->description);
}
else
str_append_printf (&usage, "%s\n%-*s%s\n", row.str,
OPT_USAGE_ALIGNMENT_COLUMN, "", opt->description);
str_free (&row);
}
fputs (usage.str, stderr);
str_free (&usage);
}
static int
opt_handler_get (struct opt_handler *self)
{
return getopt_long (self->argc, self->argv,
self->opt_string, self->options, NULL);
}
// --- Main program ------------------------------------------------------------
typedef bool (*list_foreach_fn) (void *, const char *);
@ -1043,85 +1247,82 @@ on_signal_pipe_readable (const struct pollfd *fd, struct app_context *ctx)
(void) read (fd->fd, &dummy, 1);
if (g_termination_requested && !ctx->quitting)
{
initiate_quit (ctx);
}
}
static void
print_usage (const char *program_name)
parse_program_arguments (struct app_context *ctx, int argc, char **argv)
{
fprintf (stderr,
"Usage: %s [OPTION]... { ADDRESS [/MASK] }...\n"
"Experimental network scanner.\n"
"\n"
" -d, --debug run in debug mode\n"
" -h, --help display this help and exit\n"
" -V, --version output version information and exit\n"
" -p, --port PORTS\n"
" ports/port ranges, separated by commas\n"
" -s, --service SERVICES\n"
" services to scan for\n"
" --write-default-cfg [FILENAME]\n"
" write a default configuration file and exit\n",
program_name);
}
int
main (int argc, char *argv[])
{
const char *invocation_name = argv[0];
struct app_context ctx;
app_context_init (&ctx);
// TODO: timeout for connect()
// TODO: timeout for fingerprint/whatever
static struct option opts[] =
static const struct opt opts[] =
{
{ "debug", no_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ "port", required_argument, NULL, 'p' },
{ "service", required_argument, NULL, 's' },
{ "write-default-cfg", optional_argument, NULL, 'w' },
{ NULL, 0, NULL, 0 }
{ 'd', "debug", NULL, 0, "run in debug mode" },
{ 'h', "help", NULL, 0, "display this help and exit" },
{ 'V', "version", NULL, 0, "output version information and exit" },
{ 'p', "ports", "PORTS", 0,
"ports/port ranges, separated by commas" },
{ 's', "service", "SERVICES", 0,
"services to scan for, separated by commas" },
{ 't', "connect-timeout", "TIMEOUT", 0,
"timeout for connect, in seconds"
" (default: " XSTRINGIFY (DEFAULT_CONNECT_TIMEOUT) ")" },
{ 'T', "scan-timeout", "TIMEOUT", 0,
"timeout for service scans, in seconds"
" (default: " XSTRINGIFY (DEFAULT_SCAN_TIMEOUT) ")" },
{ 'w', "write-default-cfg", "FILENAME",
OPT_OPTIONAL_ARG | OPT_LONG_ONLY,
"write a default configuration file and exit" },
{ 0, NULL, NULL, 0, NULL }
};
while (1)
struct opt_handler oh;
opt_handler_init (&oh, argc, argv, opts,
"{ ADDRESS [/MASK] }...", "Experimental network scanner.");
int c;
while ((c = opt_handler_get (&oh)) != -1)
{
int c, opt_index;
c = getopt_long (argc, argv, "dhVp:s:", opts, &opt_index);
if (c == -1)
break;
switch (c)
{
unsigned long ul;
case 'd':
g_debug_mode = true;
break;
case 'h':
print_usage (invocation_name);
opt_handler_usage (&oh);
exit (EXIT_SUCCESS);
case 'V':
printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
exit (EXIT_SUCCESS);
case 'p':
if (!list_foreach (optarg,
(list_foreach_fn) add_port_range, &ctx))
if (!list_foreach (optarg, (list_foreach_fn) add_port_range, ctx))
exit (EXIT_FAILURE);
break;
case 's':
if (!list_foreach (optarg,
(list_foreach_fn) add_service, &ctx))
if (!list_foreach (optarg, (list_foreach_fn) add_service, ctx))
exit (EXIT_FAILURE);
break;
case 't':
if (!xstrtoul (&ul, optarg, 10) || !ul)
{
print_error ("invalid value for %s", "connect timeout");
exit (EXIT_FAILURE);
}
ctx->connect_timeout = ul;
break;
case 'T':
if (!xstrtoul (&ul, optarg, 10) || !ul)
{
print_error ("invalid value for %s", "scan timeout");
exit (EXIT_FAILURE);
}
ctx->scan_timeout = ul;
break;
case 'w':
call_write_default_config (optarg, g_config_table);
exit (EXIT_SUCCESS);
default:
print_error ("wrong options");
opt_handler_usage (&oh);
exit (EXIT_FAILURE);
}
}
@ -1131,21 +1332,29 @@ main (int argc, char *argv[])
if (!argc)
{
print_usage (invocation_name);
opt_handler_usage (&oh);
exit (EXIT_FAILURE);
}
// Resolve all the scan targets
for (int i = 0; i < argc; i++)
if (!add_target (&ctx, argv[i]))
if (!add_target (ctx, argv[i]))
exit (EXIT_FAILURE);
opt_handler_free (&oh);
}
int
main (int argc, char *argv[])
{
struct app_context ctx;
app_context_init (&ctx);
parse_program_arguments (&ctx, argc, argv);
setup_signal_handlers ();
SSL_library_init ();
atexit (EVP_cleanup);
SSL_load_error_strings ();
// XXX: ERR_load_BIO_strings()? Anything else?
atexit (ERR_free_strings);
struct error *e = NULL;

3
utils.c
View File

@ -94,6 +94,9 @@ extern char **environ;
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define STRINGIFY(x) #x
#define XSTRINGIFY(x) STRINGIFY (x)
// --- Logging -----------------------------------------------------------------
static void