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https://github.com/sheumann/hush.git
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fakeidentd: fix daemon mode (was thinking that it is in
inetd-wait mode and dying after timeout). Minor fixes, comments are improved in places.
This commit is contained in:
parent
ffcef2d1f7
commit
19250813a8
@ -21,6 +21,8 @@
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/* Helpers */
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/* Even if _POSIX_MONOTONIC_CLOCK is defined, this
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* may require librt */
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#if 0 /*def _POSIX_MONOTONIC_CLOCK*/
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static time_t monotonic_time(void)
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{
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@ -194,7 +196,8 @@ static void handle_accept(isrv_state_t *state, int fd)
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if (newfd < 0) {
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if (errno == EAGAIN) return;
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/* Most probably someone gave us wrong fd type
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* (for example, non-socket) */
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* (for example, non-socket). Don't want
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* to loop forever. */
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bb_perror_msg_and_die("accept");
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}
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@ -210,6 +213,7 @@ static void handle_fd_set(isrv_state_t *state, fd_set *fds, int (*h)(int, void *
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enum { LONG_CNT = sizeof(fd_set) / sizeof(long) };
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int fds_pos;
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int fd, peer;
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/* need to know value at _the beginning_ of this routine */
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int fd_cnt = FD_COUNT;
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if (LONG_CNT * sizeof(long) != sizeof(fd_set))
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@ -235,10 +239,15 @@ static void handle_fd_set(isrv_state_t *state, fd_set *fds, int (*h)(int, void *
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}
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break; /* all words are zero */
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found_fd:
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if (fd >= fd_cnt) /* paranoia */
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if (fd >= fd_cnt) { /* paranoia */
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DPRINTF("handle_fd_set: fd > fd_cnt?? (%d > %d)",
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fd, fd_cnt);
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break;
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}
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DPRINTF("handle_fd_set: fd %d is active", fd);
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peer = FD2PEER[fd];
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if (peer < 0)
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continue; /* peer is already gone */
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if (peer == 0) {
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handle_accept(state, fd);
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continue;
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@ -259,9 +268,9 @@ static void handle_timeout(isrv_state_t *state, int (*do_timeout)(void **))
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peer = PEER_COUNT-1;
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/* peer 0 is not checked */
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while (peer > 0) {
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DPRINTF("peer %d: time diff %d", peer, (int)(CURTIME - TIMEO_TBL[peer]));
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if ((CURTIME - TIMEO_TBL[peer]) > TIMEOUT) {
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DPRINTF("peer %d: time diff %d", peer,
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(int)(CURTIME - TIMEO_TBL[peer]));
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if ((CURTIME - TIMEO_TBL[peer]) >= TIMEOUT) {
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DPRINTF("peer %d: do_timeout()", peer);
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n = do_timeout(&PARAM_TBL[peer]);
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if (n)
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@ -279,7 +288,7 @@ void isrv_run(
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int (*do_wr)(int fd, void **),
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int (*do_timeout)(void **),
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int timeout,
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int exit_if_no_clients)
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int linger_timeout)
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{
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isrv_state_t *state = xzalloc(sizeof(*state));
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state->new_peer = new_peer;
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@ -300,6 +309,8 @@ void isrv_run(
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int n;
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tv.tv_sec = timeout;
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if (PEER_COUNT <= 1)
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tv.tv_sec = linger_timeout;
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tv.tv_usec = 0;
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rd = state->rd;
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if (WR_COUNT) {
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@ -307,8 +318,9 @@ void isrv_run(
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wrp = ≀
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}
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DPRINTF("run: select(FD_COUNT:%d,timeout:%d)...", FD_COUNT, timeout);
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n = select(FD_COUNT, &rd, wrp, NULL, timeout ? &tv : NULL);
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DPRINTF("run: select(FD_COUNT:%d,timeout:%d)...",
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FD_COUNT, (int)tv.tv_sec);
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n = select(FD_COUNT, &rd, wrp, NULL, tv.tv_sec ? &tv : NULL);
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DPRINTF("run: ...select:%d", n);
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if (n < 0) {
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@ -317,7 +329,7 @@ void isrv_run(
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continue;
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}
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if (exit_if_no_clients && n == 0 && PEER_COUNT <= 1)
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if (n == 0 && linger_timeout && PEER_COUNT <= 1)
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break;
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if (timeout) {
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@ -334,4 +346,5 @@ void isrv_run(
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}
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}
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DPRINTF("run: bailout");
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/* NB: accept socket is not closed. Caller is to decide what to do */
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}
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@ -13,14 +13,6 @@
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enum { TIMEOUT = 20 };
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/* Why use alarm(TIMEOUT-1)?
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* isrv's internal select() will run with timeout=TIMEOUT.
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* If nothing happens during TIMEOUT-1 seconds (no accept/read),
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* then ALL sessions timed out by now. Instead of closing them one-by-one
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* (isrv calls do_timeout for each 'stale' session),
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* SIGALRM triggered by alarm(TIMEOUT-1) will kill us, terminating them all.
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*/
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typedef struct identd_buf_t {
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int pos;
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int fd_flag;
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@ -34,8 +26,6 @@ static int new_peer(isrv_state_t *state, int fd)
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int peer;
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identd_buf_t *buf = xzalloc(sizeof(*buf));
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alarm(TIMEOUT - 1);
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peer = isrv_register_peer(state, buf);
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if (peer < 0)
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return 0; /* failure */
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@ -53,11 +43,9 @@ static int do_rd(int fd, void **paramp)
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char *cur, *p;
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int sz;
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alarm(TIMEOUT - 1);
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cur = buf->buf + buf->pos;
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fcntl(fd, F_SETFL, buf->fd_flag | O_NONBLOCK);
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fcntl(fd, F_SETFL, buf->fd_flag);
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sz = safe_read(fd, cur, sizeof(buf->buf) - buf->pos);
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if (sz < 0) {
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@ -95,6 +83,8 @@ static void inetd_mode(void)
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identd_buf_t *buf = xzalloc(sizeof(*buf));
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/* We do NOT want nonblocking I/O here! */
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buf->fd_flag = fcntl(0, F_GETFL, 0);
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do
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alarm(TIMEOUT);
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while (do_rd(0, (void*)&buf) == 0) /* repeat */;
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}
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@ -139,6 +129,7 @@ int fakeidentd_main(int argc, char **argv)
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xlisten(fd, 5);
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}
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isrv_run(fd, new_peer, do_rd, NULL, do_timeout, TIMEOUT, 1);
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isrv_run(fd, new_peer, do_rd, /*do_wr:*/ NULL, do_timeout,
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TIMEOUT, (opt & OPT_inetdwait) ? TIMEOUT : 0);
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return 0;
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}
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