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Control: groud work for the HSFETCH command

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This adds the command on the controller side that parses and validate
arguments but does nothing for now. The HS desriptor fetch must be
modularized a bit more before we can use the command.

See control-spec.txt section 3.26 for more information on this command.

Signed-off-by: David Goulet <dgoulet@ev0ke.net>
This commit is contained in:
David Goulet 2015-02-19 14:53:41 -05:00
parent e9782043c8
commit 084be23697
1 changed files with 97 additions and 0 deletions
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97
src/or/control.c
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@ -157,6 +157,8 @@ static int handle_control_resolve(control_connection_t *conn, uint32_t len,
static int handle_control_usefeature(control_connection_t *conn,
uint32_t len,
const char *body);
static int handle_control_hsfetch(control_connection_t *conn, uint32_t len,
const char *body);
static int write_stream_target_to_buf(entry_connection_t *conn, char *buf,
size_t len);
static void orconn_target_get_name(char *buf, size_t len,
@ -3253,6 +3255,98 @@ handle_control_dropguards(control_connection_t *conn,
return 0;
}
/** Implementation for the HSFETCH command. */
static int
handle_control_hsfetch(control_connection_t *conn, uint32_t len,
const char *body)
{
char digest[DIGEST_LEN], *hsaddress = NULL, *arg1 = NULL, *desc_id = NULL;
smartlist_t *args = NULL, *hsdirs = NULL;
(void) len; /* body is nul-terminated; it's safe to ignore the length */
static const char *v2_str = "v2-";
const size_t v2_str_len = strlen(v2_str);
/* Make sure we have at least one argument, the HSAddress. */
args = getargs_helper("HSFETCH", conn, body, 1, -1);
if (!args) {
goto done;
}
/* Extract the HS address that should NOT contain the .onion part. */
arg1 = smartlist_get(args, 0);
/* Remove the HS address from the argument list so we can safely iterate
* on all the rest to find optional argument(s). */
smartlist_del(args, 0);
/* Test if it's an HS address without the .onion part. */
if (strlen(arg1) == REND_SERVICE_ID_LEN_BASE32 &&
base32_decode(digest, sizeof(digest), arg1,
REND_SERVICE_ID_LEN_BASE32) == 0) {
hsaddress = arg1;
} else if (strstr(arg1, v2_str) &&
strlen(arg1 + v2_str_len) == REND_DESC_ID_V2_LEN_BASE32 &&
base32_decode(digest, sizeof(digest), arg1 + v2_str_len,
REND_DESC_ID_V2_LEN_BASE32) == 0) {
/* We have a well formed version 2 descriptor ID. */
desc_id = arg1 + v2_str_len;
} else {
connection_printf_to_buf(conn, "552 Unrecognized \"%s\"\r\n",
arg1);
goto done;
}
/* Stores routerstatus_t object for each specified server. */
hsdirs = smartlist_new();
/* Skip first argument because it's the HSAddress. */
SMARTLIST_FOREACH_BEGIN(args, char *, arg) {
const node_t *node;
static const char *opt_server = "SERVER=";
if (!strcasecmpstart(arg, opt_server)) {
const char *server;
memset(digest, 0, sizeof(digest));
server = arg + strlen(opt_server);
/* Is the server fingerprint valid?. */
if (!string_is_hex(server) || strlen(server) != HEX_DIGEST_LEN ||
base16_decode(digest, sizeof(digest), server, HEX_DIGEST_LEN)) {
connection_printf_to_buf(conn, "552 Invalid fingerprint \"%s\"\r\n",
server);
goto done;
}
node = node_get_by_id(digest);
if (!node) {
connection_printf_to_buf(conn, "552 Server \"%s\" not found\r\n",
server);
goto done;
}
/* Valid server, add it to our local list. */
smartlist_add(hsdirs, node->rs);
} else {
connection_printf_to_buf(conn, "552 Unexpected argument \"%s\"\r\n",
arg);
goto done;
}
} SMARTLIST_FOREACH_END(arg);
/* XXX: Actually trigger the fetch(es). */
(void) hsaddress;
(void) desc_id;
(void) hsdirs;
/* All good, thanks and come again! */
send_control_done(conn);
done:
if (args) {
SMARTLIST_FOREACH(args, char *, cp, tor_free(cp));
smartlist_free(args);
}
tor_free(arg1);
smartlist_free(hsdirs);
return 0;
}
/** Called when <b>conn</b> has no more bytes left on its outbuf. */
int
connection_control_finished_flushing(control_connection_t *conn)
@ -3550,6 +3644,9 @@ connection_control_process_inbuf(control_connection_t *conn)
} else if (!strcasecmp(conn->incoming_cmd, "DROPGUARDS")) {
if (handle_control_dropguards(conn, cmd_data_len, args))
return -1;
} else if (!strcasecmp(conn->incoming_cmd, "HSFETCH")) {
if (handle_control_hsfetch(conn, cmd_data_len, args))
return -1;
} else {
connection_printf_to_buf(conn, "510 Unrecognized command \"%s\"\r\n",
conn->incoming_cmd);