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-rw-r--r--tcpsyslog.c369
1 files changed, 0 insertions, 369 deletions
diff --git a/tcpsyslog.c b/tcpsyslog.c
index 1c7d2301..8eba78c5 100644
--- a/tcpsyslog.c
+++ b/tcpsyslog.c
@@ -681,375 +681,6 @@ int TCPSessDataRcvd(int iTCPSess, char *pData, int iLen)
}
-/* CODE FOR SENDING TCP MESSAGES */
-
-/* get send status
- * rgerhards, 2005-10-24
- */
-void TCPSendSetStatus(selector_t *f, enum TCPSendStatus iNewState)
-{
- assert(f != NULL);
- assert(f->f_type == F_FORW);
- assert(f->f_un.f_forw.protocol == FORW_TCP);
- assert( (iNewState == TCP_SEND_NOTCONNECTED)
- || (iNewState == TCP_SEND_CONNECTING)
- || (iNewState == TCP_SEND_READY));
-
- /* there can potentially be a race condition, so guard by mutex */
-# ifdef USE_PTHREADS
- pthread_mutex_lock(&f->f_un.f_forw.mtxTCPSend);
-# endif
- f->f_un.f_forw.status = iNewState;
-# ifdef USE_PTHREADS
- pthread_mutex_unlock(&f->f_un.f_forw.mtxTCPSend);
-# endif
-}
-
-
-/* set send status
- * rgerhards, 2005-10-24
- */
-enum TCPSendStatus TCPSendGetStatus(selector_t *f)
-{
- enum TCPSendStatus eState;
- assert(f != NULL);
- assert(f->f_type == F_FORW);
- assert(f->f_un.f_forw.protocol == FORW_TCP);
-
- /* there can potentially be a race condition, so guard by mutex */
-# ifdef USE_PTHREADS
- pthread_mutex_lock(&f->f_un.f_forw.mtxTCPSend);
-# endif
- eState = f->f_un.f_forw.status;
-# ifdef USE_PTHREADS
- pthread_mutex_unlock(&f->f_un.f_forw.mtxTCPSend);
-# endif
-
- return eState;
-}
-
-
-/* Initialize TCP sockets (for sender)
- * This is done once per selector line, if not yet initialized.
- */
-static int TCPSendCreateSocket(selector_t *f)
-{
- int fd;
- struct addrinfo *r;
-
- assert(f != NULL);
-
- r = f->f_un.f_forw.f_addr;
-
- while(r != NULL) {
- fd = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
- if (fd != -1) {
- /* We can not allow the TCP sender to block syslogd, at least
- * not in a single-threaded design. That would cause rsyslogd to
- * loose input messages - which obviously also would affect
- * other selector lines, too. So we do set it to non-blocking and
- * handle the situation ourselfs (by discarding messages). IF we run
- * dual-threaded, however, the situation is different: in this case,
- * the receivers and the selector line processing are only loosely
- * coupled via a memory buffer. Now, I think, we can afford the extra
- * wait time. Thus, we enable blocking mode for TCP if we compile with
- * pthreads.
- * rgerhards, 2005-10-25
- */
-# ifndef USE_PTHREADS
- /* set to nonblocking - rgerhards 2005-07-20 */
- fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
-# endif
- if (connect (fd, r->ai_addr, r->ai_addrlen) != 0) {
- if(errno == EINPROGRESS) {
- /* this is normal - will complete during select */
- TCPSendSetStatus(f, TCP_SEND_CONNECTING);
- return fd;
- } else {
- dprintf("create tcp connection failed, reason %s",
- strerror(errno));
- }
-
- }
- else {
- TCPSendSetStatus(f, TCP_SEND_READY);
- return fd;
- }
- close(fd);
- }
- else {
- dprintf("couldn't create send socket, reason %s", strerror(errno));
- }
- r = r->ai_next;
- }
-
- dprintf("no working socket could be obtained");
-
- return -1;
-}
-
-
-/* Sends a TCP message. It is first checked if the
- * session is open and, if not, it is opened. Then the send
- * is tried. If it fails, one silent re-try is made. If the send
- * fails again, an error status (-1) is returned. If all goes well,
- * 0 is returned. The TCP session is NOT torn down.
- * For now, EAGAIN is ignored (causing message loss) - but it is
- * hard to do something intelligent in this case. With this
- * implementation here, we can not block and/or defer. Things are
- * probably a bit better when we move to liblogging. The alternative
- * would be to enhance the current select server with buffering and
- * write descriptors. This seems not justified, given the expected
- * short life span of this code (and the unlikeliness of this event).
- * rgerhards 2005-07-06
- * This function is now expected to stay. Libloging won't be used for
- * that purpose. I have added the param "len", because it is known by the
- * caller and so safes us some time. Also, it MUST be given because there
- * may be NULs inside msg so that we can not rely on strlen(). Please note
- * that the restrictions outlined above do not existin in multi-threaded
- * mode, which we assume will now be most often used. So there is no
- * real issue with the potential message loss in single-threaded builds.
- * rgerhards, 2006-11-30
- *
- * In order to support compressed messages via TCP, we must support an
- * octet-counting based framing (LF may be part of the compressed message).
- * We are now supporting the same mode that is available in IETF I-D
- * syslog-transport-tls-05 (current at the time of this writing). This also
- * eases things when we go ahead and implement that framing. I have now made
- * available two cases where this framing is used: either by explitely
- * specifying it in the config file or implicitely when sending a compressed
- * message. In the later case, compressed and uncompressed messages within
- * the same session have different framings. If it is explicitely set to
- * octet-counting, only this framing mode is used within the session.
- * rgerhards, 2006-12-07
- */
-int TCPSend(selector_t *f, char *msg, size_t len)
-{
- int retry = 0;
- int done = 0;
- int bIsCompressed;
- int lenSend;
- char *buf = NULL; /* if this is non-NULL, it MUST be freed before return! */
- enum TCPSendStatus eState;
- TCPFRAMINGMODE framingToUse;
-
- assert(f != NULL);
- assert(msg != NULL);
- assert(len > 0);
-
- bIsCompressed = *msg == 'z'; /* cache this, so that we can modify the message buffer */
- /* select framing for this record. If we have a compressed record, we always need to
- * use octet counting because the data potentially contains all control characters
- * including LF.
- */
- framingToUse = bIsCompressed ? TCP_FRAMING_OCTET_COUNTING : f->f_un.f_forw.tcp_framing;
-
- do { /* try to send message */
- if(f->f_file <= 0) {
- /* we need to open the socket first */
- if((f->f_file = TCPSendCreateSocket(f)) <= 0) {
- return -1;
- }
- }
-
- eState = TCPSendGetStatus(f); /* cache info */
-
- if(eState == TCP_SEND_CONNECTING) {
- /* In this case, we save the buffer. If we have a
- * system with few messages, that hopefully prevents
- * message loss at all. However, we make no further attempts,
- * just the first message is saved. So we only try this
- * if there is not yet a saved message present.
- * rgerhards 2005-07-20
- */
- if(f->f_un.f_forw.savedMsg == NULL) {
- f->f_un.f_forw.savedMsg = malloc(len * sizeof(char));
- if(f->f_un.f_forw.savedMsg == NULL)
- return 0; /* nothing we can do... */
- memcpy(f->f_un.f_forw.savedMsg, msg, len);
- f->f_un.f_forw.savedMsgLen = len;
- }
- return 0;
- } else if(eState != TCP_SEND_READY)
- /* This here is debatable. For the time being, we
- * accept the loss of a single message (e.g. during
- * connection setup in favour of not messing with
- * wait time and timeouts. The reason is that such
- * things might otherwise cost us considerable message
- * loss on the receiving side (even at a timeout set
- * to just 1 second). - rgerhards 2005-07-20
- */
- return 0;
-
- /* now check if we need to add a line terminator. We need to
- * copy the string in memory in this case, this is probably
- * quicker than using writev and definitely quicker than doing
- * two socket calls.
- * rgerhards 2005-07-22
- *//*
- * Some messages already contain a \n character at the end
- * of the message. We append one only if we there is not
- * already one. This seems the best fit, though this also
- * means the message does not arrive unaltered at the final
- * destination. But in the spirit of legacy syslog, this is
- * probably the best to do...
- * rgerhards 2005-07-20
- */
-
- /* Build frame based on selected framing */
- if(framingToUse == TCP_FRAMING_OCTET_STUFFING) {
- if((*(msg+len-1) != '\n')) {
- if(buf != NULL)
- free(buf);
- /* in the malloc below, we need to add 2 to the length. The
- * reason is that we a) add one character and b) len does
- * not take care of the '\0' byte. Up until today, it was just
- * +1 , which caused rsyslogd to sometimes dump core.
- * I have added this comment so that the logic is not accidently
- * changed again. rgerhards, 2005-10-25
- */
- if((buf = malloc((len + 2) * sizeof(char))) == NULL) {
- /* extreme mem shortage, try to solve
- * as good as we can. No point in calling
- * any alarms, they might as well run out
- * of memory (the risk is very high, so we
- * do NOT risk that). If we have a message of
- * more than 1 byte (what I guess), we simply
- * overwrite the last character.
- * rgerhards 2005-07-22
- */
- if(len > 1) {
- *(msg+len-1) = '\n';
- } else {
- /* we simply can not do anything in
- * this case (its an error anyhow...).
- */
- }
- } else {
- /* we got memory, so we can copy the message */
- memcpy(buf, msg, len); /* do not copy '\0' */
- *(buf+len) = '\n';
- *(buf+len+1) = '\0';
- msg = buf; /* use new one */
- ++len; /* care for the \n */
- }
- }
- } else {
- /* Octect-Counting
- * In this case, we need to always allocate a buffer. This is because
- * we need to put a header in front of the message text
- */
- char szLenBuf[16];
- int iLenBuf;
-
- /* important: the printf-mask is "%d<sp>" because there must be a
- * space after the len!
- *//* The chairs of the IETF syslog-sec WG have announced that it is
- * consensus to do the octet count on the SYSLOG-MSG part only. I am
- * now changing the code to reflect this. Hopefully, it will not change
- * once again (there can no compatibility layer programmed for this).
- * To be on the save side, I just comment the code out. I mark these
- * comments with "IETF20061218".
- * rgerhards, 2006-12-19
- */
- iLenBuf = snprintf(szLenBuf, sizeof(szLenBuf)/sizeof(char), "%d ", (int) len);
- /* IETF20061218 iLenBuf =
- snprintf(szLenBuf, sizeof(szLenBuf)/sizeof(char), "%d ", len + iLenBuf);*/
-
- if((buf = malloc((len + iLenBuf) * sizeof(char))) == NULL) {
- /* we are out of memory. This is an extreme situation. We do not
- * call any alarm handlers because they most likely run out of mem,
- * too. We are brave enough to call debug output, though. Other than
- * that, there is nothing left to do. We can not sent the message (as
- * in case of the other framing, because the message is incomplete.
- * We could, however, send two chunks (header and text separate), but
- * that would cause a lot of complexity in the code. So we think it
- * is appropriate enough to just make sure we do not crash in this
- * very unlikely case. For this, it is justified just to loose
- * the message. Rgerhards, 2006-12-07
- */
- dprintf("Error: out of memory when building TCP octet-counted "
- "frame. Message is lost, trying to continue.\n");
- return 0;
- }
-
- memcpy(buf, szLenBuf, iLenBuf); /* header */
- memcpy(buf + iLenBuf, msg, len); /* message */
- len += iLenBuf; /* new message size */
- msg = buf; /* set message buffer */
- }
-
- /* frame building complete, on to actual sending */
-
- lenSend = send(f->f_file, msg, len, 0);
- dprintf("TCP sent %d bytes, requested %d, msg: '%s'\n", lenSend, len,
- bIsCompressed ? "***compressed***" : msg);
- if((unsigned)lenSend == len) {
- /* all well */
- if(buf != NULL) {
- free(buf);
- }
- return 0;
- } else if(lenSend != -1) {
- /* no real error, could "just" not send everything...
- * For the time being, we ignore this...
- * rgerhards, 2005-10-25
- */
- dprintf("message not completely (tcp)send, ignoring %d\n", lenSend);
-# if USE_PTHREADS
- usleep(1000); /* experimental - might be benefitial in this situation */
-# endif
- if(buf != NULL)
- free(buf);
- return 0;
- }
-
- switch(errno) {
- case EMSGSIZE:
- dprintf("message not (tcp)send, too large\n");
- /* This is not a real error, so it is not flagged as one */
- if(buf != NULL)
- free(buf);
- return 0;
- break;
- case EINPROGRESS:
- case EAGAIN:
- dprintf("message not (tcp)send, would block\n");
-# if USE_PTHREADS
- usleep(1000); /* experimental - might be benefitial in this situation */
-# endif
- /* we loose this message, but that's better than loosing
- * all ;)
- */
- /* This is not a real error, so it is not flagged as one */
- if(buf != NULL)
- free(buf);
- return 0;
- break;
- default:
- dprintf("message not (tcp)send");
- break;
- }
-
- if(retry == 0) {
- ++retry;
- /* try to recover */
- close(f->f_file);
- TCPSendSetStatus(f, TCP_SEND_NOTCONNECTED);
- f->f_file = -1;
- } else {
- if(buf != NULL)
- free(buf);
- return -1;
- }
- } while(!done); /* warning: do ... while() */
- /*NOT REACHED*/
-
- if(buf != NULL)
- free(buf);
- return -1; /* only to avoid compiler warning! */
-}
-
#endif
/********************************************************************
* ### END OF SYSLOG/TCP CODE ###
generated by cgit (git 2.34.1) at 2024-11-17 18:16:37 +0000