#include <netinet/in.h>
#include <arpa/inet.h>
#include <atalk/logger.h>
+#include <setjmp.h>
#include <atalk/dsi.h>
#include <atalk/compat.h>
#include <atalk/util.h>
+#include <atalk/locking.h>
#include "globals.h"
#include "switch.h"
#include "fork.h"
#include "dircache.h"
-#ifdef FORCE_UIDGID
-#warning UIDGID
-#include "uid.h"
-#endif /* FORCE_UIDGID */
-
-#define CHILD_DIE (1 << 0)
-#define CHILD_RUNNING (1 << 1)
-#define CHILD_SLEEPING (1 << 2)
-#define CHILD_DATA (1 << 3)
-
/*
* We generally pass this from afp_over_dsi to all afp_* funcs, so it should already be
* available everywhere. Unfortunately some funcs (eg acltoownermode) need acces to it
*/
AFPObj *AFPobj = NULL;
-static struct {
- AFPObj *obj;
- unsigned char flags;
- int tickle;
-} child;
+typedef struct {
+ uint16_t DSIreqID;
+ uint8_t AFPcommand;
+ uint32_t result;
+} rc_elem_t;
+/*
+ * AFP replay cache:
+ * - fix sized array
+ * - indexed just by taking DSIreqID mod REPLAYCACHE_SIZE
+ */
+static rc_elem_t replaycache[REPLAYCACHE_SIZE];
+static sigjmp_buf recon_jmp;
static void afp_dsi_close(AFPObj *obj)
{
DSI *dsi = obj->handle;
+ close(obj->ipc_fd);
+ obj->ipc_fd = -1;
+
/* we may have been called from a signal handler caught when afpd was running
* as uid 0, that's the wrong user for volume's prexec_close scripts if any,
* restore our login user
if (obj->logout)
(*obj->logout)();
- LOG(log_info, logtype_afpd, "AFP statistics: %.2f KB read, %.2f KB written",
+ LOG(log_note, logtype_afpd, "AFP statistics: %.2f KB read, %.2f KB written",
dsi->read_count/1024.0, dsi->write_count/1024.0);
log_dircache_stat();
*/
static void afp_dsi_die(int sig)
{
-static volatile int in_handler;
-
- if (in_handler) {
- return;
+ 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 */
}
- /* it's not atomic but we don't care because it's an exit function
- * ie if a signal is received here, between the test and the affectation,
- * it will not return.
- */
- in_handler = 1;
-
- dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN);
- afp_dsi_close(child.obj);
- if (sig) /* if no signal, assume dieing because logins are disabled &
+
+ 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) {
}
}
-/* */
-static void afp_dsi_sleep(void)
+/* SIGURG handler (primary reconnect) */
+static void afp_dsi_transfer_session(int sig _U_)
{
- child.flags |= CHILD_SLEEPING;
- dsi_sleep(child.obj->handle, 1);
+ 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);
}
/* ------------------- */
{
struct sigaction sv;
struct itimerval it;
-
- child.flags |= CHILD_DIE;
+ DSI *dsi = (DSI *)AFPobj->handle;
+ dsi->flags |= DSI_DIE;
/* shutdown and don't reconnect. server going down in 5 minutes. */
setmessage("The server is going down for maintenance.");
- if (dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
+ if (dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
- DSI *dsi = (DSI *) child.obj->handle;
+ DSI *dsi = (DSI *)AFPobj->handle;
dsi->down_request = 1;
}
}
/* ---------------------- */
-#ifdef SERVERTEXT
static void afp_dsi_getmesg (int sig _U_)
{
- DSI *dsi = (DSI *) child.obj->handle;
+ DSI *dsi = (DSI *)AFPobj->handle;
dsi->msg_request = 1;
- if (dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
+ if (dsi_attention(AFPobj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
dsi->msg_request = 2;
}
-#endif /* SERVERTEXT */
static void alarm_handler(int sig _U_)
{
int err;
- DSI *dsi = (DSI *) child.obj->handle;
+ DSI *dsi = (DSI *)AFPobj->handle;
- /* we have to restart the timer because some libraries
- * may use alarm() */
+ /* we have to restart the timer because some libraries may use alarm() */
setitimer(ITIMER_REAL, &dsi->timer, NULL);
- /* we got some traffic from the client since the previous timer
- * tick. */
- if ((child.flags & CHILD_DATA)) {
- child.flags &= ~CHILD_DATA;
+ /* we got some traffic from the client since the previous timer tick. */
+ if ((dsi->flags & DSI_DATA)) {
+ dsi->flags &= ~DSI_DATA;
return;
}
- /* if we're in the midst of processing something,
- don't die. */
- if ((child.flags & CHILD_SLEEPING) && child.tickle++ < child.obj->options.sleep) {
+ dsi->tickle++;
+ LOG(log_maxdebug, logtype_afpd, "alarm: tickles: %u, flags: %s|%s|%s|%s|%s|%s|%s|%s|%s",
+ dsi->tickle,
+ (dsi->flags & DSI_DATA) ? "DSI_DATA" : "-",
+ (dsi->flags & DSI_RUNNING) ? "DSI_RUNNING" : "-",
+ (dsi->flags & DSI_SLEEPING) ? "DSI_SLEEPING" : "-",
+ (dsi->flags & DSI_EXTSLEEP) ? "DSI_EXTSLEEP" : "-",
+ (dsi->flags & DSI_DISCONNECTED) ? "DSI_DISCONNECTED" : "-",
+ (dsi->flags & DSI_DIE) ? "DSI_DIE" : "-",
+ (dsi->flags & DSI_NOREPLY) ? "DSI_NOREPLY" : "-",
+ (dsi->flags & DSI_RECONSOCKET) ? "DSI_RECONSOCKET" : "-",
+ (dsi->flags & DSI_RECONINPROG) ? "DSI_RECONINPROG" : "-");
+
+ if (dsi->flags & DSI_SLEEPING) {
+ if (dsi->tickle > AFPobj->options.sleep) {
+ LOG(log_note, logtype_afpd, "afp_alarm: sleep time ended");
+ afp_dsi_die(EXITERR_CLNT);
+ }
return;
}
-
- if ((child.flags & CHILD_RUNNING) || (child.tickle++ < child.obj->options.timeout)) {
- if (!(err = pollvoltime(child.obj)))
- err = dsi_tickle(child.obj->handle);
- if (err <= 0)
+
+ if (dsi->flags & DSI_DISCONNECTED) {
+ if (dsi->tickle > AFPobj->options.disconnected) {
+ LOG(log_error, logtype_afpd, "afp_alarm: reconnect timer expired, goodbye");
afp_dsi_die(EXITERR_CLNT);
-
- } else { /* didn't receive a tickle. close connection */
- LOG(log_error, logtype_afpd, "afp_alarm: child timed out");
- afp_dsi_die(EXITERR_CLNT);
+ }
+ return;
+ }
+
+ /* if we're in the midst of processing something, don't die. */
+ if ( !(dsi->flags & DSI_RUNNING) && (dsi->tickle >= AFPobj->options.timeout)) {
+ LOG(log_error, logtype_afpd, "afp_alarm: child timed out, entering disconnected state");
+ dsi->proto_close(dsi);
+ dsi->flags |= DSI_DISCONNECTED;
+ return;
+ }
+
+ if ((err = pollvoltime(AFPobj)) == 0)
+ LOG(log_debug, logtype_afpd, "afp_alarm: sending DSI tickle");
+ err = dsi_tickle(AFPobj->handle);
+ if (err <= 0) {
+ LOG(log_error, logtype_afpd, "afp_alarm: connection problem, entering disconnected state");
+ dsi->proto_close(dsi);
+ dsi->flags |= DSI_DISCONNECTED;
}
}
if (dsi->msg_request) {
if (dsi->msg_request == 2) {
/* didn't send it in signal handler */
- dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
+ dsi_attention(AFPobj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
}
dsi->msg_request = 0;
- readmessage(child.obj);
+ readmessage(AFPobj);
}
if (dsi->down_request) {
dsi->down_request = 0;
- dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
+ dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
AFPATTN_MESG | AFPATTN_TIME(5));
}
}
void afp_over_dsi(AFPObj *obj)
{
DSI *dsi = (DSI *) obj->handle;
+ int rc_idx;
u_int32_t err, cmd;
u_int8_t function;
struct sigaction action;
obj->exit = afp_dsi_die;
obj->reply = (int (*)()) dsi_cmdreply;
obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
-
- obj->sleep = afp_dsi_sleep;
- child.obj = obj;
- child.tickle = child.flags = 0;
+ dsi->tickle = 0;
memset(&action, 0, sizeof(action));
sigaddset(&action.sa_mask, SIGTERM);
sigaddset(&action.sa_mask, SIGUSR1);
sigaddset(&action.sa_mask, SIGINT);
-#ifdef SERVERTEXT
sigaddset(&action.sa_mask, SIGUSR2);
-#endif
action.sa_flags = SA_RESTART;
if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
afp_dsi_die(EXITERR_SYS);
}
+ /* install SIGURG */
+ action.sa_handler = afp_dsi_transfer_session;
+ sigemptyset( &action.sa_mask );
+ sigaddset(&action.sa_mask, SIGALRM);
+ sigaddset(&action.sa_mask, SIGTERM);
+ sigaddset(&action.sa_mask, SIGUSR1);
+ sigaddset(&action.sa_mask, SIGINT);
+ sigaddset(&action.sa_mask, SIGUSR2);
+ action.sa_flags = SA_RESTART;
+ if ( sigaction( SIGURG, &action, NULL ) < 0 ) {
+ LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
+ afp_dsi_die(EXITERR_SYS);
+ }
+
/* install SIGTERM */
action.sa_handler = afp_dsi_die;
sigemptyset( &action.sa_mask );
sigaddset(&action.sa_mask, SIGHUP);
sigaddset(&action.sa_mask, SIGUSR1);
sigaddset(&action.sa_mask, SIGINT);
-#ifdef SERVERTEXT
sigaddset(&action.sa_mask, SIGUSR2);
-#endif
action.sa_flags = SA_RESTART;
if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
afp_dsi_die(EXITERR_SYS);
}
-#ifdef SERVERTEXT
/* Added for server message support */
action.sa_handler = afp_dsi_getmesg;
sigemptyset( &action.sa_mask );
LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
afp_dsi_die(EXITERR_SYS);
}
-#endif /* SERVERTEXT */
/* SIGUSR1 - set down in 5 minutes */
action.sa_handler = afp_dsi_timedown;
sigaddset(&action.sa_mask, SIGHUP);
sigaddset(&action.sa_mask, SIGTERM);
sigaddset(&action.sa_mask, SIGINT);
-#ifdef SERVERTEXT
sigaddset(&action.sa_mask, SIGUSR2);
-#endif
action.sa_flags = SA_RESTART;
if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
sigaddset(&action.sa_mask, SIGTERM);
sigaddset(&action.sa_mask, SIGUSR1);
sigaddset(&action.sa_mask, SIGINT);
-#ifdef SERVERTEXT
sigaddset(&action.sa_mask, SIGUSR2);
-#endif
action.sa_flags = SA_RESTART;
if ((sigaction(SIGALRM, &action, NULL) < 0) ||
(setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
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));
+ }
+ }
+
/* get stuck here until the end */
- while ((cmd = dsi_receive(dsi))) {
- child.tickle = 0;
- child.flags &= ~CHILD_SLEEPING;
- dsi_sleep(dsi, 0); /* wake up */
+ 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_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;
+ }
+ /* Some error on the client connection, enter disconnected state */
+ dsi->flags |= DSI_DISCONNECTED;
+
+ /* the client sometimes logs out (afp_logout) but doesn't close the DSI session */
+ if (dsi->flags & DSI_AFP_LOGGED_OUT) {
+ afp_dsi_close(obj);
+ exit(0);
+ }
+
+ 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(child.obj);
+ load_volumes(AFPobj);
dircache_dump();
log_dircache_stat();
}
}
}
- if (cmd == DSIFUNC_TICKLE) {
- /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
- if ((child.flags & CHILD_DIE))
- dsi_tickle(dsi);
- pending_request(dsi);
- continue;
- }
- child.flags |= CHILD_DATA;
+ 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_info, logtype_afpd, "done");
- return;
+ 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:
function = (u_char) dsi->commands[0];
- /* 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;
- child.flags |= CHILD_RUNNING;
+ /* AFP replay cache */
+ rc_idx = dsi->clientID % REPLAYCACHE_SIZE;
+ LOG(log_debug, logtype_afpd, "DSI request ID: %u", dsi->clientID);
- LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
+ 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;
- err = (*afp_switch[function])(obj,
- (char *)&dsi->commands, dsi->cmdlen,
- (char *)&dsi->data, &dsi->datalen);
+ LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
- LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
- AfpNum2name(function), AfpErr2name(err));
+ err = (*afp_switch[function])(obj,
+ (char *)&dsi->commands, dsi->cmdlen,
+ (char *)&dsi->data, &dsi->datalen);
- dir_free_invalid_q();
+ LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
+ AfpNum2name(function), AfpErr2name(err));
-#ifdef FORCE_UIDGID
- /* bring everything back to old euid, egid */
- if (obj->force_uid)
- restore_uidgid ( &obj->uidgid );
-#endif /* FORCE_UIDGID */
- child.flags &= ~CHILD_RUNNING;
- } else {
- LOG(log_error, logtype_afpd, "bad function %X", function);
- dsi->datalen = 0;
- err = AFPERR_NOOP;
+ dir_free_invalid_q();
+
+ 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->noreply) {
- dsi->noreply = 0;
+ if (dsi->flags & DSI_NOREPLY) {
+ dsi->flags &= ~DSI_NOREPLY;
break;
}
if (!dsi_cmdreply(dsi, err)) {
LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
- afp_dsi_die(EXITERR_CLNT);
+ dsi->flags |= DSI_DISCONNECTED;
}
break;
function = (u_char) dsi->commands[0];
if ( afp_switch[ function ] != NULL ) {
dsi->datalen = DSI_DATASIZ;
- child.flags |= CHILD_RUNNING;
+ dsi->flags |= DSI_RUNNING;
LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
AfpNum2name(function), AfpErr2name(err));
- child.flags &= ~CHILD_RUNNING;
-#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;
} else {
LOG(log_error, logtype_afpd, "(write) bad function %x", function);
dsi->datalen = 0;
if (!dsi_wrtreply(dsi, err)) {
LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
- afp_dsi_die(EXITERR_CLNT);
+ dsi->flags |= DSI_DISCONNECTED;
}
break;
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