/* SIGURG handler (primary reconnect) */
static void afp_dsi_transfer_session(int sig _U_)
{
uint16_t dsiID;
int socket;
DSI *dsi = (DSI *)AFPobj->handle;
LOG(log_debug, logtype_afpd, "afp_dsi_transfer_session: got SIGURG, trying to receive session");
if (readt(AFPobj->ipc_fd, &dsiID, 2, 0, 2) != 2) {
LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive DSI id, goodbye");
afp_dsi_close(AFPobj);
exit(EXITERR_SYS);
}
if ((socket = recv_fd(AFPobj->ipc_fd, 1)) == -1) {
LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive session fd, goodbye");
afp_dsi_close(AFPobj);
exit(EXITERR_SYS);
}
LOG(log_debug, logtype_afpd, "afp_dsi_transfer_session: received socket fd: %i", socket);
dsi->proto_close(dsi);
dsi->socket = socket;
dsi->flags = DSI_RECONSOCKET;
dsi->datalen = 0;
dsi->eof = dsi->start = dsi->buffer;
dsi->in_write = 0;
dsi->header.dsi_requestID = dsiID;
dsi->header.dsi_command = DSIFUNC_CMD;
/*
* The session transfer happens in the middle of FPDisconnect old session, thus we
* have to send the reply now.
*/
if (!dsi_cmdreply(dsi, AFP_OK)) {
LOG(log_error, logtype_afpd, "dsi_cmdreply: %s", strerror(errno) );
afp_dsi_close(AFPobj);
exit(EXITERR_CLNT);
}
LOG(log_note, logtype_afpd, "afp_dsi_transfer_session: succesfull primary reconnect");
/*
* Now returning from this signal handler return to dsi_receive which should start
* reading/continuing from the connected socket that was passed via the parent from
* another session. The parent will terminate that session.
*/
siglongjmp(recon_jmp, 1);
}
/* SIGQUIT handler */
static void ipc_reconnect_handler(int sig _U_)
{
if (reconnect_ipc(AFPobj) != 0) {
LOG(log_error, logtype_afpd, "ipc_reconnect_handler: failed IPC reconnect");
afp_dsi_close(AFPobj);
exit(EXITERR_SYS);
}
if (ipc_child_write(AFPobj->ipc_fd, IPC_GETSESSION, AFPobj->sinfo.clientid_len, AFPobj->sinfo.clientid) != 0) {
LOG(log_error, logtype_afpd, "ipc_reconnect_handler: failed IPC ID resend");
afp_dsi_close(AFPobj);
exit(EXITERR_SYS);
}
LOG(log_note, logtype_afpd, "ipc_reconnect_handler: IPC reconnect done");
}
/* -------------------------------
* SIGTERM
* a little bit of code duplication.
*/
static void afp_dsi_die(int sig)
{
DSI *dsi = (DSI *)AFPobj->handle;
if (dsi->flags & DSI_RECONINPROG) {
/* Primary reconnect succeeded, got SIGTERM from afpd parent */
dsi->flags &= ~DSI_RECONINPROG;
return; /* this returns to afp_disconnect */
}
if (dsi->flags & DSI_DISCONNECTED) {
LOG(log_note, logtype_afpd, "Disconnected session terminating");
exit(0);
}
dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN);
afp_dsi_close(AFPobj);
if (sig) /* if no signal, assume dieing because logins are disabled &
don't log it (maintenance mode)*/
LOG(log_info, logtype_afpd, "Connection terminated");
if (sig == SIGTERM || sig == SIGALRM) {
exit( 0 );
}
else {
exit(sig);
}
}
/* -------------------------------------------
afp over dsi. this never returns.
*/
void afp_over_dsi(AFPObj *obj)
{
DSI *dsi = (DSI *) obj->handle;
int rc_idx;
u_int32_t err, cmd;
u_int8_t function;
AFPobj = obj;
obj->exit = afp_dsi_die;
obj->reply = (int (*)()) dsi_cmdreply;
obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
dsi->tickle = 0;
afp_over_dsi_sighandlers(obj);
if (dircache_init(obj->options.dircachesize) != 0)
afp_dsi_die(EXITERR_SYS);
/* set TCP snd/rcv buf */
if (obj->options.tcp_rcvbuf) {
if (setsockopt(dsi->socket,
SOL_SOCKET,
SO_RCVBUF,
&obj->options.tcp_rcvbuf,
sizeof(obj->options.tcp_rcvbuf)) != 0) {
LOG(log_error, logtype_dsi, "afp_over_dsi: setsockopt(SO_RCVBUF): %s", strerror(errno));
}
}
if (obj->options.tcp_sndbuf) {
if (setsockopt(dsi->socket,
SOL_SOCKET,
SO_SNDBUF,
&obj->options.tcp_sndbuf,
sizeof(obj->options.tcp_sndbuf)) != 0) {
LOG(log_error, logtype_dsi, "afp_over_dsi: setsockopt(SO_SNDBUF): %s", strerror(errno));
}
}
/* set TCP_NODELAY */
int flag = 1;
setsockopt(dsi->socket, SOL_TCP, TCP_NODELAY, &flag, sizeof(flag));
/* get stuck here until the end */
while (1) {
if (sigsetjmp(recon_jmp, 1) != 0)
/* returning from SIGALARM handler for a primary reconnect */
continue;
/* Blocking read on the network socket */
cmd = dsi_stream_receive(dsi);
if (cmd == 0) {
/* cmd == 0 is the error condition */
if (dsi->flags & DSI_RECONSOCKET) {
/* we just got a reconnect so we immediately try again to receive on the new fd */
dsi->flags &= ~DSI_RECONSOCKET;
continue;
}
/* the client sometimes logs out (afp_logout) but doesn't close the DSI session */
if (dsi->flags & DSI_AFP_LOGGED_OUT) {
LOG(log_note, logtype_afpd, "afp_over_dsi: client logged out, terminating DSI session");
afp_dsi_close(obj);
exit(0);
}
#if 0
/* got ECONNRESET in read from client => exit*/
if (dsi->flags & DSI_GOT_ECONNRESET) {
LOG(log_note, logtype_afpd, "afp_over_dsi: client connection reset");
afp_dsi_close(obj);
exit(0);
}
#endif
if (dsi->flags & DSI_RECONINPROG) {
LOG(log_note, logtype_afpd, "afp_over_dsi: failed reconnect");
afp_dsi_close(obj);
exit(0);
}
/* Some error on the client connection, enter disconnected state */
if (dsi_disconnect(dsi) != 0)
afp_dsi_die(EXITERR_CLNT);
while (dsi->flags & DSI_DISCONNECTED)
pause(); /* gets interrupted by SIGALARM or SIGURG tickle */
continue; /* continue receiving until disconnect timer expires
* or a primary reconnect succeeds */
}
if (!(dsi->flags & DSI_EXTSLEEP) && (dsi->flags & DSI_SLEEPING)) {
LOG(log_debug, logtype_afpd, "afp_over_dsi: got data, ending normal sleep");
dsi->flags &= ~DSI_SLEEPING;
dsi->tickle = 0;
}
if (reload_request) {
reload_request = 0;
load_volumes(AFPobj);
}
/* The first SIGINT enables debugging, the next restores the config */
if (debug_request) {
static int debugging = 0;
debug_request = 0;
dircache_dump();
uuidcache_dump();
if (debugging) {
if (obj->options.logconfig)
setuplog(obj->options.logconfig);
else
setuplog("default log_note");
debugging = 0;
} else {
char logstr[50];
debugging = 1;
sprintf(logstr, "default log_maxdebug /tmp/afpd.%u.XXXXXX", getpid());
setuplog(logstr);
}
}
dsi->flags |= DSI_DATA;
dsi->tickle = 0;
switch(cmd) {
case DSIFUNC_CLOSE:
LOG(log_debug, logtype_afpd, "DSI: close session request");
afp_dsi_close(obj);
LOG(log_note, logtype_afpd, "done");
exit(0);
case DSIFUNC_TICKLE:
dsi->flags &= ~DSI_DATA; /* thats no data in the sense we use it in alarm_handler */
LOG(log_debug, logtype_afpd, "DSI: client tickle");
/* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
if ((dsi->flags & DSI_DIE))
dsi_tickle(dsi);
break;
case DSIFUNC_CMD:
#ifdef AFS
if ( writtenfork ) {
if ( flushfork( writtenfork ) < 0 ) {
LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
}
writtenfork = NULL;
}
#endif /* AFS */
function = (u_char) dsi->commands[0];
/* AFP replay cache */
rc_idx = dsi->clientID % REPLAYCACHE_SIZE;
LOG(log_debug, logtype_dsi, "DSI request ID: %u", dsi->clientID);
if (replaycache[rc_idx].DSIreqID == dsi->clientID
&& replaycache[rc_idx].AFPcommand == function) {
LOG(log_note, logtype_afpd, "AFP Replay Cache match: id: %u / cmd: %s",
dsi->clientID, AfpNum2name(function));
err = replaycache[rc_idx].result;
/* AFP replay cache end */
} else {
/* send off an afp command. in a couple cases, we take advantage
* of the fact that we're a stream-based protocol. */
if (afp_switch[function]) {
dsi->datalen = DSI_DATASIZ;
dsi->flags |= DSI_RUNNING;
LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
err = (*afp_switch[function])(obj,
(char *)&dsi->commands, dsi->cmdlen,
(char *)&dsi->data, &dsi->datalen);
LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
AfpNum2name(function), AfpErr2name(err));
dir_free_invalid_q();
#ifdef FORCE_UIDGID
/* bring everything back to old euid, egid */
if (obj->force_uid)
restore_uidgid ( &obj->uidgid );
#endif /* FORCE_UIDGID */
dsi->flags &= ~DSI_RUNNING;
/* Add result to the AFP replay cache */
replaycache[rc_idx].DSIreqID = dsi->clientID;
replaycache[rc_idx].AFPcommand = function;
replaycache[rc_idx].result = err;
} else {
LOG(log_error, logtype_afpd, "bad function %X", function);
dsi->datalen = 0;
err = AFPERR_NOOP;
}
}
/* single shot toggle that gets set by dsi_readinit. */
if (dsi->flags & DSI_NOREPLY) {
dsi->flags &= ~DSI_NOREPLY;
break;
} else if (!dsi_cmdreply(dsi, err)) {
LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
if (dsi_disconnect(dsi) != 0)
afp_dsi_die(EXITERR_CLNT);
}
break;
case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
function = (u_char) dsi->commands[0];
if ( afp_switch[ function ] != NULL ) {
dsi->datalen = DSI_DATASIZ;
dsi->flags |= DSI_RUNNING;
LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
err = (*afp_switch[function])(obj,
(char *)&dsi->commands, dsi->cmdlen,
(char *)&dsi->data, &dsi->datalen);
LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
AfpNum2name(function), AfpErr2name(err));
dsi->flags &= ~DSI_RUNNING;
#ifdef FORCE_UIDGID
/* bring everything back to old euid, egid */
if (obj->force_uid)
restore_uidgid ( &obj->uidgid );
#endif /* FORCE_UIDGID */
} else {
LOG(log_error, logtype_afpd, "(write) bad function %x", function);
dsi->datalen = 0;
err = AFPERR_NOOP;
}
if (!dsi_wrtreply(dsi, err)) {
LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
if (dsi_disconnect(dsi) != 0)
afp_dsi_die(EXITERR_CLNT);
}
break;
case DSIFUNC_ATTN: /* attention replies */
break;
/* error. this usually implies a mismatch of some kind
* between server and client. if things are correct,
* we need to flush the rest of the packet if necessary. */
default:
LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
dsi_writeflush(dsi);
break;
}
pending_request(dsi);
fce_pending_events(obj);
}
/* error */
afp_dsi_die(EXITERR_CLNT);
}