int login_handler(struct worker_t *self, struct client_t *c, int l4proto, char *s, int len)
{
int argc;
char *argv[256];
int i, rc;
/* make it null-terminated for our string processing */
char *e = s + len;
*e = 0;
hlog(LOG_DEBUG, "%s: login string: '%s' (%d)", c->addr_rem, s, len);
/* parse to arguments */
if ((argc = parse_args_noshell(argv, s)) == 0 || *argv[0] == '#')
return 0;
if (argc < 2) {
hlog(LOG_WARNING, "%s: Invalid login string, too few arguments: '%s'", c->addr_rem, s);
rc = client_printf(self, c, "# Invalid login string, too few arguments\r\n");
goto failed_login;
}
if (strcasecmp(argv[0], "user") != 0) {
if (strcasecmp(argv[0], "GET") == 0)
c->failed_cmds = 10; /* bail out right away for a HTTP client */
c->failed_cmds++;
hlog(LOG_WARNING, "%s: Invalid login string, no 'user': '******'", c->addr_rem, s);
rc = client_printf(self, c, "# Invalid login command\r\n");
goto failed_login;
}
char *username = argv[1];
/* limit username length */
if (strlen(username) > CALLSIGNLEN_MAX) {
hlog(LOG_WARNING, "%s: Invalid login string, too long 'user' username: '******'", c->addr_rem, c->username);
username[CALLSIGNLEN_MAX] = 0;
rc = client_printf(self, c, "# Invalid username format\r\n");
goto failed_login;
}
#ifndef FIXED_IOBUFS
c->username = hstrdup(username);
#else
strncpy(c->username, username, sizeof(c->username));
c->username[sizeof(c->username)-1] = 0;
#endif
c->username_len = strlen(c->username);
/* check the username against a static list of disallowed usernames */
for (i = 0; (disallow_login_usernames[i]); i++) {
if (strcasecmp(c->username, disallow_login_usernames[i]) == 0) {
hlog(LOG_WARNING, "%s: Login by user '%s' not allowed", c->addr_rem, c->username);
rc = client_printf(self, c, "# Login by user not allowed\r\n");
goto failed_login;
}
}
/* make sure the callsign is OK on the APRS-IS */
if (check_invalid_q_callsign(c->username, c->username_len)) {
hlog(LOG_WARNING, "%s: Invalid login string, invalid 'user': '******'", c->addr_rem, c->username);
rc = client_printf(self, c, "# Invalid username format\r\n");
goto failed_login;
}
int given_passcode = -1;
for (i = 2; i < argc; i++) {
if (strcasecmp(argv[i], "pass") == 0) {
if (++i >= argc) {
hlog(LOG_WARNING, "%s/%s: No passcode after pass command", c->addr_rem, username);
break;
}
given_passcode = atoi(argv[i]);
if (given_passcode >= 0)
if (given_passcode == aprs_passcode(c->username))
c->validated = 1;
} else if (strcasecmp(argv[i], "vers") == 0) {
/* Collect application name and version separately.
* Some clients only give out application name but
* no version. If those same applications do try to
* use filter or udp, the filter/udp keyword will end
* up as the version number. So good luck with that.
*/
if (i+1 >= argc) {
hlog(LOG_INFO, "%s/%s: No application name after 'vers' in login", c->addr_rem, username);
break;
}
login_set_app_name(c, argv[i+1], (i+2 < argc) ? argv[i+2] : "");
i += 2;
} else if (strcasecmp(argv[i], "udp") == 0) {
if (++i >= argc) {
hlog(LOG_WARNING, "%s/%s: Missing UDP port number after UDP command", c->addr_rem, username);
break;
}
int udp_port = atoi(argv[i]);
if (udp_port < 1024 || udp_port > 65535) {
hlog(LOG_WARNING, "%s/%s: UDP port number %s is out of range", c->addr_rem, username, argv[i]);
break;
}
if (login_setup_udp_feed(c, udp_port) != 0) {
/* Sorry, no UDP service for this port.. */
hlog(LOG_DEBUG, "%s/%s: Requested UDP on client port with no UDP configured", c->addr_rem, username);
rc = client_printf(self, c, "# No UDP service available on this port\r\n");
if (rc < -2)
return rc; // client got destroyed
}
} else if (strstr(argv[i], "filter")) {
/* Follows javaaprssrvr's example - any command having 'filter' in the
* end is OK.
*/
if (!(c->flags & CLFLAGS_USERFILTEROK)) {
rc = client_printf(self, c, "# No user-specified filters on this port\r\n");
if (rc < -2)
return rc; // client got destroyed
break;
}
/* copy the null-separated filter arguments back to a space-separated
* string, for the status page to show
*/
char *fp = c->filter_s;
char *fe = c->filter_s + FILTER_S_SIZE;
int f_non_first = 0;
while (++i < argc) {
int l = strlen(argv[i]);
if (fp + l + 2 < fe) {
if (f_non_first) {
*fp++ = ' ';
}
memcpy(fp, argv[i], l);
fp += l;
*fp = 0;
f_non_first = 1;
}
/* parse filters in argv[i] */
rc = filter_parse(c, argv[i], 1);
if (rc) {
rc = client_printf( self, c, "# Parse errors on filter spec: '%s'\r\n", argv[i]);
if (rc < -2)
return rc; // The client probably got destroyed!
}
}
}
}
/* ok, login succeeded, switch handler */
c->handler = &incoming_handler; /* handler of all incoming APRS-IS data during a connection */
rc = client_printf( self, c, "# logresp %s %s, server %s\r\n",
username,
(c->validated) ? "verified" : "unverified",
serverid );
if (rc < -2)
return rc; // The client probably got destroyed!
c->keepalive = now + keepalive_interval/2 + random() % keepalive_interval;
c->state = CSTATE_CONNECTED;
hlog(LOG_DEBUG, "%s: login '%s'%s%s%s%s%s%s%s%s",
c->addr_rem, username,
(c->validated) ? " pass_ok" : "",
(!c->validated && given_passcode >= 0) ? " pass_invalid" : "",
(given_passcode < 0) ? " pass_none" : "",
(c->udp_port) ? " UDP" : "",
(c->app_name) ? " app " : "",
(c->app_name) ? c->app_name : "",
(c->app_version) ? " ver " : "",
(c->app_version) ? c->app_version : ""
);
/* Add the client to the client list.
*
* If the client logged in with a valid passcode, check if there are
* other validated clients logged in with the same username.
* If one is found, it needs to be disconnected.
*
* The lookup is done while holding the write lock to the clientlist,
* instead of a separate lookup call, so that two clients logging in
* at exactly the same time won't make it.
*/
int old_fd = clientlist_add(c);
if (c->validated && old_fd != -1) {
hlog(LOG_INFO, "fd %d: Disconnecting duplicate validated client with username '%s'", old_fd, username);
/* The other client may be on another thread, so cannot client_close() it.
* There is a small potential race here, if the old client disconnected and
* the fd was recycled for another client right after the clientlist check.
*/
shutdown(old_fd, SHUT_RDWR);
}
return 0;
failed_login:
/* if we already lost the client, just return */
if (rc < -2)
return rc;
c->failed_cmds++;
if (c->failed_cmds >= 3) {
client_close(self, c, CLIERR_LOGIN_RETRIES);
return -3;
}
return rc;
}
static int accept_liveupgrade_single(cJSON *client, int *rxerr_map, int rxerr_map_len)
{
cJSON *fd, *listener_id, *username, *time_connect, *tick_connect;
cJSON *state;
cJSON *addr_loc;
cJSON *udp_port;
cJSON *app_name, *app_version;
cJSON *verified;
cJSON *obuf_q;
cJSON *bytes_rx, *bytes_tx;
cJSON *pkts_rx, *pkts_tx, *pkts_ign;
cJSON *rx_errs;
cJSON *filter;
cJSON *ibuf, *obuf;
cJSON *client_heard;
cJSON *lat, *lng;
unsigned addr_len;
union sockaddr_u sa;
char *argv[256];
int i, argc;
const char *username_s = "unknown";
/* get username first, so we can log it later */
username = accept_liveupgrade_cJSON_get(client, "username", cJSON_String, username_s);
if (username)
username_s = username->valuestring;
fd = accept_liveupgrade_cJSON_get(client, "fd", cJSON_Number, username_s);
int fd_i = -1;
if (fd)
fd_i = fd->valueint;
if (fd_i < 0) {
hlog(LOG_INFO, "Live upgrade: Client '%s' has negative fd %d, ignoring (corepeer?)", username_s, fd_i);
return -1;
}
listener_id = accept_liveupgrade_cJSON_get(client, "listener_id", cJSON_Number, username_s);
state = accept_liveupgrade_cJSON_get(client, "state", cJSON_String, username_s);
time_connect = accept_liveupgrade_cJSON_get(client, "t_connect", cJSON_Number, username_s);
addr_loc = accept_liveupgrade_cJSON_get(client, "addr_loc", cJSON_String, username_s);
app_name = accept_liveupgrade_cJSON_get(client, "app_name", cJSON_String, username_s);
app_version = accept_liveupgrade_cJSON_get(client, "app_version", cJSON_String, username_s);
verified = accept_liveupgrade_cJSON_get(client, "verified", cJSON_Number, username_s);
obuf_q = accept_liveupgrade_cJSON_get(client, "obuf_q", cJSON_Number, username_s);
bytes_rx = accept_liveupgrade_cJSON_get(client, "bytes_rx", cJSON_Number, username_s);
bytes_tx = accept_liveupgrade_cJSON_get(client, "bytes_tx", cJSON_Number, username_s);
pkts_rx = accept_liveupgrade_cJSON_get(client, "pkts_rx", cJSON_Number, username_s);
pkts_tx = accept_liveupgrade_cJSON_get(client, "pkts_tx", cJSON_Number, username_s);
pkts_ign = accept_liveupgrade_cJSON_get(client, "pkts_ign", cJSON_Number, username_s);
rx_errs = accept_liveupgrade_cJSON_get(client, "rx_errs", cJSON_Array, username_s);
filter = accept_liveupgrade_cJSON_get(client, "filter", cJSON_String, username_s);
/* optional */
tick_connect = cJSON_GetObjectItem(client, "t_connect_tick");
udp_port = cJSON_GetObjectItem(client, "udp_port");
ibuf = cJSON_GetObjectItem(client, "ibuf");
obuf = cJSON_GetObjectItem(client, "obuf");
client_heard = cJSON_GetObjectItem(client, "client_heard");
lat = cJSON_GetObjectItem(client, "lat");
lng = cJSON_GetObjectItem(client, "lng");
if (!(
(fd)
&& (listener_id)
&& (state)
&& (username)
&& (time_connect)
&& (addr_loc)
&& (app_name)
&& (app_version)
&& (verified)
&& (obuf_q)
&& (bytes_rx)
&& (bytes_tx)
&& (pkts_rx)
&& (pkts_tx)
&& (pkts_ign)
&& (rx_errs)
&& (filter)
)) {
hlog(LOG_ERR, "Live upgrade: Fields missing from client JSON, discarding client fd %d", fd_i);
if (fd_i >= 0)
close(fd_i);
return -1;
}
hlog(LOG_DEBUG, "Old client on fd %d: %s", fd->valueint, username->valuestring);
/* fetch peer address from the fd instead of parsing it from text */
addr_len = sizeof(sa);
if (getpeername(fd->valueint, &sa.sa, &addr_len) != 0) {
/* Sometimes clients disconnect during upgrade, especially on slow RPi servers... */
if (errno == ENOTCONN)
hlog(LOG_INFO, "Live upgrade: Client %s on fd %d has disconnected during upgrade (%s)",
username->valuestring, fd->valueint, strerror(errno));
else
hlog(LOG_ERR, "Live upgrade: getpeername client fd %d failed: %s", fd->valueint, strerror(errno));
close(fd->valueint);
return -1;
}
/* convert client address to string */
char *client_addr_s = strsockaddr( &sa.sa, addr_len );
/* find the right listener for this client, for configuration and accounting */
struct listen_t *l = liveupgrade_find_listener(listener_id->valueint);
if (!l) {
hlog(LOG_INFO, "Live upgrade: Listener has been removed for fd %d (%s - local %s): disconnecting %s",
fd->valueint, client_addr_s, addr_loc->valuestring, username->valuestring);
close(fd->valueint);
hfree(client_addr_s);
return -1;
}
struct client_t *c = accept_client_for_listener(l, fd->valueint, client_addr_s, &sa, addr_len);
if (!c) {
hlog(LOG_ERR, "Live upgrade - client_alloc returned NULL, too many clients. Denied client %s on fd %d from %s",
username->valuestring, fd->valueint, client_addr_s);
close(fd->valueint);
hfree(client_addr_s);
return -1;
}
hfree(client_addr_s);
if (strcmp(state->valuestring, "connected") == 0) {
c->state = CSTATE_CONNECTED;
c->handler_line_in = &incoming_handler;
strncpy(c->username, username->valuestring, sizeof(c->username));
c->username[sizeof(c->username)-1] = 0;
c->username_len = strlen(c->username);
} else if (strcmp(state->valuestring, "login") == 0) {
c->state = CSTATE_LOGIN;
c->handler_line_in = &login_handler;
} else {
hlog(LOG_ERR, "Live upgrade: Client %s is in invalid state '%s' (fd %d)", l->addr_s, state->valuestring, l->fd);
goto err;
}
/* distribute keepalive intervals for the existing old clients
* but send them rather sooner than later */
// coverity[dont_call] // squelch warning: not security sensitive use of random(): load distribution
c->keepalive = tick + (random() % (keepalive_interval/2));
/* distribute cleanup intervals over the next 2 minutes */
// coverity[dont_call] // squelch warning: not security sensitive use of random(): load distribution
c->cleanup = tick + (random() % 120);
c->connect_time = time_connect->valueint;
/* live upgrade / backward compatibility: upgrading from <= 1.8.2 requires the 'else' path' */
if (tick_connect && tick_connect->type == cJSON_Number)
c->connect_tick = tick_connect->valueint;
else /* convert to monotonic time */
c->connect_tick = tick - (now - c->connect_time);
c->validated = verified->valueint;
c->localaccount.rxbytes = bytes_rx->valuedouble;
c->localaccount.txbytes = bytes_tx->valuedouble;
c->localaccount.rxpackets = pkts_rx->valuedouble;
c->localaccount.txpackets = pkts_tx->valuedouble;
c->localaccount.rxdrops = pkts_ign->valuedouble;
login_set_app_name(c, app_name->valuestring, app_version->valuestring);
// handle client's filter setting
if (c->flags & CLFLAGS_USERFILTEROK && (filter) && (filter->valuestring) && *(filter->valuestring)) {
// archive a copy of the filters, for status display
strncpy(c->filter_s, filter->valuestring, FILTER_S_SIZE);
c->filter_s[FILTER_S_SIZE-1] = 0;
sanitize_ascii_string(c->filter_s);
char *f = hstrdup(filter->valuestring);
argc = parse_args(argv, f);
for (i = 0; i < argc; ++i) {
filter_parse(c, argv[i], 1);
}
hfree(f);
}
// set up UDP downstream if necessary
if (udp_port && udp_port->type == cJSON_Number && udp_port->valueint > 1024 && udp_port->valueint < 65536) {
if (login_setup_udp_feed(c, udp_port->valueint) != 0) {
hlog(LOG_DEBUG, "%s/%s: Requested UDP on client port with no UDP configured", c->addr_rem, c->username);
}
}
// fill up ibuf
if (ibuf && ibuf->type == cJSON_String && ibuf->valuestring) {
int l = hex_decode(c->ibuf, c->ibuf_size, ibuf->valuestring);
if (l < 0) {
hlog(LOG_ERR, "Live upgrade: %s/%s: Failed to decode ibuf: %s", c->addr_rem, c->username, ibuf->valuestring);
} else {
c->ibuf_end = l;
hlog(LOG_DEBUG, "Live upgrade: Decoded ibuf %d bytes: '%.*s'", l, l, c->ibuf);
hlog(LOG_DEBUG, "Hex: %s", ibuf->valuestring);
}
}
// fill up obuf
if (obuf && obuf->type == cJSON_String && obuf->valuestring) {
int l = hex_decode(c->obuf, c->obuf_size, obuf->valuestring);
if (l < 0) {
hlog(LOG_ERR, "Live upgrade: %s/%s: Failed to decode obuf: %s", c->addr_rem, c->username, obuf->valuestring);
} else {
c->obuf_start = 0;
c->obuf_end = l;
hlog(LOG_DEBUG, "Live upgrade: Decoded obuf %d bytes: '%.*s'", l, l, c->obuf);
hlog(LOG_DEBUG, "Hex: %s", obuf->valuestring);
}
}
/* load list of stations heard by this client, to immediately support
* messaging
*/
if (client_heard && client_heard->type == cJSON_Array)
client_heard_json_load(c, client_heard);
/* load rxerrs counters, with error name string mapping to support
* adding/reordering of error counters
*/
if (rx_errs && rx_errs->type == cJSON_Array && rxerr_map && rxerr_map_len > 0)
accept_rx_err_load(c, rx_errs, rxerr_map, rxerr_map_len);
/* set client lat/lon, if they're given
*/
if (lat && lng && lat->type == cJSON_Number && lng->type == cJSON_Number) {
c->loc_known = 1;
c->lat = lat->valuedouble;
c->lng = lng->valuedouble;
}
hlog(LOG_DEBUG, "%s - Accepted live upgrade client on fd %d from %s", c->addr_loc, c->fd, c->addr_rem);
/* set client socket options, return -1 on serious errors */
if (set_client_sockopt(c) != 0)
goto err;
/* Add the client to the client list. */
int old_fd = clientlist_add(c);
if (c->validated && old_fd != -1) {
/* TODO: If old connection is SSL validated, and this one is not, do not disconnect it. */
hlog(LOG_INFO, "fd %d: Disconnecting duplicate validated client with username '%s'", old_fd, c->username);
shutdown(old_fd, SHUT_RDWR);
}
/* ok, found it... lock the new client queue and pass the client */
if (pass_client_to_worker(pick_next_worker(), c))
goto err;
return 0;
err:
close(c->fd);
inbound_connects_account(0, c->portaccount); /* something failed, remove this from accounts.. */
client_free(c);
return -1;
}
