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-rw-r--r--runtime/netstrm.c550
1 files changed, 437 insertions, 113 deletions
diff --git a/runtime/netstrm.c b/runtime/netstrm.c
index 0afb4a5e..67611aa0 100644
--- a/runtime/netstrm.c
+++ b/runtime/netstrm.c
@@ -12,6 +12,11 @@
* to carry out its work (including, and most importantly, transport
* drivers).
*
+ * Work on this module begun 2008-04-17 by Rainer Gerhards. This code
+ * borrows from librelp's tcp.c/.h code. librelp is dual licensed and
+ * Rainer Gerhards and Adiscon GmbH have agreed to permit using the code
+ * under the terms of the GNU Lesser General Public License.
+ *
* Copyright 2007, 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
@@ -54,6 +59,7 @@
#include "srUtils.h"
#include "obj.h"
#include "errmsg.h"
+#include "net.h"
#include "netstrm.h"
MODULE_TYPE_LIB
@@ -62,155 +68,464 @@ MODULE_TYPE_LIB
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
+DEFobjCurrIf(net)
+
+#define DFLT_PORT "514"
+#warning "urgent TODO: default port!"
+
+/* Standard-Constructor
+ */
+BEGINobjConstruct(netstrm) /* be sure to specify the object type also in END macro! */
+ pThis->sock = -1;
+ pThis->iSessMax = 500; /* default max nbr of sessions -TODO:make configurable--rgerhards, 2008-04-17*/
+ENDobjConstruct(netstrm)
-/* The following #ifdef sequence is a small compatibility
- * layer. It tries to work around the different availality
- * levels of SO_BSDCOMPAT on linuxes...
- * I borrowed this code from
- * http://www.erlang.org/ml-archive/erlang-questions/200307/msg00037.html
- * It still needs to be a bit better adapted to rsyslog.
- * rgerhards 2005-09-19
+/* ConstructionFinalizer
*/
-#include <sys/utsname.h>
-static int
-should_use_so_bsdcompat(void)
+static rsRetVal
+netstrmConstructFinalize(netstrm_t __attribute__((unused)) *pThis)
{
-#ifndef OS_BSD
- static int init_done;
- static int so_bsdcompat_is_obsolete;
-
- if (!init_done) {
- struct utsname myutsname;
- unsigned int version, patchlevel;
-
- init_done = 1;
- if (uname(&myutsname) < 0) {
- char errStr[1024];
- dbgprintf("uname: %s\r\n", rs_strerror_r(errno, errStr, sizeof(errStr)));
- return 1;
+ DEFiRet;
+ ISOBJ_TYPE_assert(pThis, netstrm);
+ RETiRet;
+}
+
+
+/* destructor for the netstrm object */
+BEGINobjDestruct(netstrm) /* be sure to specify the object type also in END and CODESTART macros! */
+ int i;
+CODESTARTobjDestruct(netstrm)
+ if(pThis->sock != -1) {
+ close(pThis->sock);
+ pThis->sock = -1;
}
- /* Format is <version>.<patchlevel>.<sublevel><extraversion>
- where the first three are unsigned integers and the last
- is an arbitrary string. We only care about the first two. */
- if (sscanf(myutsname.release, "%u.%u", &version, &patchlevel) != 2) {
- dbgprintf("uname: unexpected release '%s'\r\n",
- myutsname.release);
- return 1;
+
+ if(pThis->socks != NULL) {
+ /* if we have some sockets at this stage, we need to close them */
+ for(i = 1 ; i <= pThis->socks[0] ; ++i)
+ close(pThis->socks[i]);
+ free(pThis->socks);
}
- /* SO_BSCOMPAT is deprecated and triggers warnings in 2.5
- kernels. It is a no-op in 2.4 but not in 2.2 kernels. */
- if (version > 2 || (version == 2 && patchlevel >= 5))
- so_bsdcompat_is_obsolete = 1;
- }
- return !so_bsdcompat_is_obsolete;
-#else /* #ifndef OS_BSD */
- return 1;
-#endif /* #ifndef OS_BSD */
+
+ if(pThis->pRemHostIP != NULL)
+ free(pThis->pRemHostIP);
+ if(pThis->pRemHostName != NULL)
+ free(pThis->pRemHostName);
+ENDobjDestruct(netstrm)
+
+
+/* abort a connection. This is much like Destruct(), but tries
+ * to discard any unsent data. -- rgerhards, 2008-03-24
+ */
+rsRetVal
+AbortDestruct(netstrm_t **ppThis)
+{
+ struct linger ling;
+
+ DEFiRet;
+ assert(ppThis != NULL);
+ ISOBJ_TYPE_assert((*ppThis), netstrm);
+
+ if((*ppThis)->sock != -1) {
+ ling.l_onoff = 1;
+ ling.l_linger = 0;
+ if(setsockopt((*ppThis)->sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling)) < 0 ) {
+ dbgprintf("could not set SO_LINGER, errno %d\n", errno);
+ }
+ }
+
+ iRet = netstrmDestruct(ppThis);
+
+ RETiRet;
}
-#ifndef SO_BSDCOMPAT
-/* this shall prevent compiler errors due to undfined name */
-#define SO_BSDCOMPAT 0
-#endif
-/* get the hostname of the message source. This was originally in cvthname()
- * but has been moved out of it because of clarity and fuctional separation.
- * It must be provided by the socket we received the message on as well as
- * a NI_MAXHOST size large character buffer for the FQDN.
- *
+/* Set pRemHost based on the address provided. This is to be called upon accept()ing
+ * a connection request. It must be provided by the socket we received the
+ * message on as well as a NI_MAXHOST size large character buffer for the FQDN.
* Please see http://www.hmug.org/man/3/getnameinfo.php (under Caveats)
- * for some explanation of the code found below. We do by default not
- * discard message where we detected malicouos DNS PTR records. However,
- * there is a user-configurabel option that will tell us if
- * we should abort. For this, the return value tells the caller if the
- * message should be processed (1) or discarded (0).
+ * for some explanation of the code found below. If we detect a malicious
+ * hostname, we return RS_RET_MALICIOUS_HNAME and let the caller decide
+ * on how to deal with that.
+ * rgerhards, 2008-03-31
*/
static rsRetVal
-gethname(struct sockaddr_storage *f, uchar *pszHostFQDN)
+SetRemHost(netstrm_t *pThis, struct sockaddr *pAddr)
{
- DEFiRet;
int error;
- sigset_t omask, nmask;
- char ip[NI_MAXHOST];
+ uchar szIP[NI_MAXHOST] = "";
+ uchar szHname[NI_MAXHOST] = "";
struct addrinfo hints, *res;
+ size_t len;
- assert(f != NULL);
- assert(pszHostFQDN != NULL);
+ DEFiRet;
+ ISOBJ_TYPE_assert(pThis, netstrm);
+ assert(pAddr != NULL);
- error = getnameinfo((struct sockaddr *)f, SALEN((struct sockaddr *)f),
- ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
+ error = getnameinfo(pAddr, SALEN(pAddr), (char*)szIP, sizeof(szIP), NULL, 0, NI_NUMERICHOST);
- if (error) {
+ if(error) {
dbgprintf("Malformed from address %s\n", gai_strerror(error));
- strcpy((char*) pszHostFQDN, "???");
- ABORT_FINALIZE(RS_RET_INVALID_SOURCE);
+ strcpy((char*)szHname, "???");
+ strcpy((char*)szIP, "???");
+ ABORT_FINALIZE(RS_RET_INVALID_HNAME);
}
if(!glbl.GetDisableDNS()) {
- sigemptyset(&nmask);
- sigaddset(&nmask, SIGHUP);
- pthread_sigmask(SIG_BLOCK, &nmask, &omask);
-
- error = getnameinfo((struct sockaddr *)f, SALEN((struct sockaddr *) f),
- (char*)pszHostFQDN, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
-
- if (error == 0) {
+ error = getnameinfo(pAddr, SALEN(pAddr), (char*)szHname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
+ if(error == 0) {
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_socktype = SOCK_STREAM;
-
/* we now do a lookup once again. This one should fail,
* because we should not have obtained a non-numeric address. If
* we got a numeric one, someone messed with DNS!
*/
- if (getaddrinfo ((char*)pszHostFQDN, NULL, &hints, &res) == 0) {
- uchar szErrMsg[1024];
+ if(getaddrinfo((char*)szHname, NULL, &hints, &res) == 0) {
freeaddrinfo (res);
- /* OK, we know we have evil. The question now is what to do about
- * it. One the one hand, the message might probably be intended
- * to harm us. On the other hand, losing the message may also harm us.
- * Thus, the behaviour is controlled by the $DropMsgsWithMaliciousDnsPTRRecords
- * option. If it tells us we should discard, we do so, else we proceed,
- * but log an error message together with it.
- * time being, we simply drop the name we obtained and use the IP - that one
- * is OK in any way. We do also log the error message. rgerhards, 2007-07-16
- */
- if(glbl.GetDropMalPTRMsgs() == 1) {
- snprintf((char*)szErrMsg, sizeof(szErrMsg) / sizeof(uchar),
- "Malicious PTR record, message dropped "
- "IP = \"%s\" HOST = \"%s\"",
- ip, pszHostFQDN);
- errmsg.LogError(NO_ERRCODE, "%s", szErrMsg);
- pthread_sigmask(SIG_SETMASK, &omask, NULL);
- ABORT_FINALIZE(RS_RET_MALICIOUS_ENTITY);
- }
-
- /* Please note: we deal with a malicous entry. Thus, we have crafted
- * the snprintf() below so that all text is in front of the entry - maybe
- * it contains characters that make the message unreadable
- * (OK, I admit this is more or less impossible, but I am paranoid...)
- * rgerhards, 2007-07-16
+ /* OK, we know we have evil, so let's indicate this to our caller */
+ snprintf((char*)szHname, NI_MAXHOST, "[MALICIOUS:IP=%s]", szIP);
+ dbgprintf("Malicious PTR record, IP = \"%s\" HOST = \"%s\"", szIP, szHname);
+ iRet = RS_RET_MALICIOUS_HNAME;
+ }
+ } else {
+ strcpy((char*)szHname, (char*)szIP);
+ }
+ } else {
+ strcpy((char*)szHname, (char*)szIP);
+ }
+
+ /* We now have the names, so now let's allocate memory and store them permanently.
+ * (side note: we may hold on to these values for quite a while, thus we trim their
+ * memory consumption)
+ */
+ len = strlen((char*)szIP) + 1; /* +1 for \0 byte */
+ if((pThis->pRemHostIP = malloc(len)) == NULL)
+ ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
+ memcpy(pThis->pRemHostIP, szIP, len);
+
+ len = strlen((char*)szHname) + 1; /* +1 for \0 byte */
+ if((pThis->pRemHostName = malloc(len)) == NULL) {
+ free(pThis->pRemHostIP); /* prevent leak */
+ pThis->pRemHostIP = NULL;
+ ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
+ }
+ memcpy(pThis->pRemHostName, szHname, len);
+
+finalize_it:
+ RETiRet;
+}
+
+
+
+/* accept an incoming connection request, sock provides the socket on which we can
+ * accept the new session.
+ * rgerhards, 2008-03-17
+ */
+rsRetVal
+AcceptConnReq(netstrm_t **ppThis, int sock)
+{
+ netstrm_t *pThis = NULL;
+ int sockflags;
+ struct sockaddr_storage addr;
+ socklen_t addrlen = sizeof(addr);
+ int iNewSock = -1;
+
+ DEFiRet;
+ assert(ppThis != NULL);
+
+ iNewSock = accept(sock, (struct sockaddr*) &addr, &addrlen);
+ if(iNewSock < 0) {
+ ABORT_FINALIZE(RS_RET_ACCEPT_ERR);
+ }
+
+ /* construct our object so that we can use it... */
+ CHKiRet(netstrmConstruct(&pThis));
+
+ /* TODO: obtain hostname, normalize (callback?), save it */
+ CHKiRet(SetRemHost(pThis, (struct sockaddr*) &addr));
+
+ /* set the new socket to non-blocking IO */
+ if((sockflags = fcntl(iNewSock, F_GETFL)) != -1) {
+ sockflags |= O_NONBLOCK;
+ /* SETFL could fail too, so get it caught by the subsequent
+ * error check.
+ */
+ sockflags = fcntl(iNewSock, F_SETFL, sockflags);
+ }
+ if(sockflags == -1) {
+ dbgprintf("error %d setting fcntl(O_NONBLOCK) on relp socket %d", errno, iNewSock);
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
+
+ pThis->sock = iNewSock;
+
+ *ppThis = pThis;
+
+finalize_it:
+ if(iRet != RS_RET_OK) {
+ if(pThis != NULL)
+ netstrmDestruct(&pThis);
+ /* the close may be redundant, but that doesn't hurt... */
+ if(iNewSock >= 0)
+ close(iNewSock);
+ }
+
+ RETiRet;
+}
+
+
+/* initialize the tcp socket for a listner
+ * pLstnPort is either a pointer to a port name or NULL, in which case the
+ * default is used.
+ * gerhards, 2008-03-17
+ */
+rsRetVal
+LstnInit(netstrm_t *pThis, uchar *pLstnPort)
+{
+ struct addrinfo hints, *res, *r;
+ int error, maxs, *s, on = 1;
+ int sockflags;
+ uchar *pLstnPt;
+
+ DEFiRet;
+ ISOBJ_TYPE_assert(pThis, netstrm);
+
+ pLstnPt = (pLstnPort == NULL) ? (uchar*) DFLT_PORT : pLstnPort;
+ dbgprintf("creating relp tcp listen socket on port %s\n", pLstnPt);
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = AI_PASSIVE;
+ hints.ai_family = PF_UNSPEC; /* TODO: permit to configure IPv4/v6 only! */
+ hints.ai_socktype = SOCK_STREAM;
+
+ error = getaddrinfo(NULL, (char*) pLstnPt, &hints, &res);
+ if(error) {
+ dbgprintf("error %d querying port '%s'\n", error, pLstnPt);
+ ABORT_FINALIZE(RS_RET_INVALID_PORT);
+ }
+
+ /* Count max number of sockets we may open */
+ for(maxs = 0, r = res; r != NULL ; r = r->ai_next, maxs++)
+ /* EMPTY */;
+ pThis->socks = malloc((maxs+1) * sizeof(int));
+ if (pThis->socks == NULL) {
+ dbgprintf("couldn't allocate memory for TCP listen sockets, suspending RELP message reception.");
+ freeaddrinfo(res);
+ ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
+ }
+
+ *pThis->socks = 0; /* num of sockets counter at start of array */
+ s = pThis->socks + 1;
+ for(r = res; r != NULL ; r = r->ai_next) {
+ *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
+ if (*s < 0) {
+ if(!(r->ai_family == PF_INET6 && errno == EAFNOSUPPORT))
+ dbgprintf("creating relp tcp listen socket");
+ /* it is debatable if PF_INET with EAFNOSUPPORT should
+ * also be ignored...
*/
- snprintf((char*)szErrMsg, sizeof(szErrMsg) / sizeof(uchar),
- "Malicious PTR record (message accepted, but used IP "
- "instead of PTR name: IP = \"%s\" HOST = \"%s\"",
- ip, pszHostFQDN);
- errmsg.LogError(NO_ERRCODE, "%s", szErrMsg);
+ continue;
+ }
+
+#ifdef IPV6_V6ONLY
+ if (r->ai_family == AF_INET6) {
+ int iOn = 1;
+ if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
+ (char *)&iOn, sizeof (iOn)) < 0) {
+ close(*s);
+ *s = -1;
+ continue;
+ }
+ }
+#endif
+ if(setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) < 0 ) {
+ dbgprintf("error %d setting relp/tcp socket option\n", errno);
+ close(*s);
+ *s = -1;
+ continue;
+ }
+
+ /* We use non-blocking IO! */
+ if((sockflags = fcntl(*s, F_GETFL)) != -1) {
+ sockflags |= O_NONBLOCK;
+ /* SETFL could fail too, so get it caught by the subsequent
+ * error check.
+ */
+ sockflags = fcntl(*s, F_SETFL, sockflags);
+ }
+ if(sockflags == -1) {
+ dbgprintf("error %d setting fcntl(O_NONBLOCK) on relp socket", errno);
+ close(*s);
+ *s = -1;
+ continue;
+ }
+
+
+
+ /* We need to enable BSD compatibility. Otherwise an attacker
+ * could flood our log files by sending us tons of ICMP errors.
+ */
+#ifndef BSD
+ if(net.should_use_so_bsdcompat()) {
+ if (setsockopt(*s, SOL_SOCKET, SO_BSDCOMPAT,
+ (char *) &on, sizeof(on)) < 0) {
+ errmsg.LogError(NO_ERRCODE, "TCP setsockopt(BSDCOMPAT)");
+ close(*s);
+ *s = -1;
+ continue;
+ }
+ }
+#endif
- error = 1; /* that will trigger using IP address below. */
+ if( (bind(*s, r->ai_addr, r->ai_addrlen) < 0)
+#ifndef IPV6_V6ONLY
+ && (errno != EADDRINUSE)
+#endif
+ ) {
+ dbgprintf("error %d while binding relp tcp socket", errno);
+ close(*s);
+ *s = -1;
+ continue;
+ }
+
+ if(listen(*s,pThis->iSessMax / 10 + 5) < 0) {
+ /* If the listen fails, it most probably fails because we ask
+ * for a too-large backlog. So in this case we first set back
+ * to a fixed, reasonable, limit that should work. Only if
+ * that fails, too, we give up.
+ */
+ dbgprintf("listen with a backlog of %d failed - retrying with default of 32.",
+ pThis->iSessMax / 10 + 5);
+ if(listen(*s, 32) < 0) {
+ dbgprintf("relp listen error %d, suspending\n", errno);
+ close(*s);
+ *s = -1;
+ continue;
}
- }
- pthread_sigmask(SIG_SETMASK, &omask, NULL);
+ }
+
+ (*pThis->socks)++;
+ s++;
}
- if(error || glbl.GetDisableDNS()) {
- dbgprintf("Host name for your address (%s) unknown\n", ip);
- strcpy((char*) pszHostFQDN, ip);
- ABORT_FINALIZE(RS_RET_ADDRESS_UNKNOWN);
- }
+ if(res != NULL)
+ freeaddrinfo(res);
+
+ if(*pThis->socks != maxs)
+ dbgprintf("We could initialize %d RELP TCP listen sockets out of %d we received "
+ "- this may or may not be an error indication.\n", *pThis->socks, maxs);
+
+ if(*pThis->socks == 0) {
+ dbgprintf("No RELP TCP listen socket could successfully be initialized, "
+ "message reception via RELP disabled.\n");
+ free(pThis->socks);
+ ABORT_FINALIZE(RS_RET_COULD_NOT_BIND);
+ }
+
+finalize_it:
+ RETiRet;
+}
+
+
+/* receive data from a tcp socket
+ * The lenBuf parameter must contain the max buffer size on entry and contains
+ * the number of octets read (or -1 in case of error) on exit. This function
+ * never blocks, not even when called on a blocking socket. That is important
+ * for client sockets, which are set to block during send, but should not
+ * block when trying to read data. If *pLenBuf is -1, an error occured and
+ * errno holds the exact error cause.
+ * rgerhards, 2008-03-17
+ */
+rsRetVal
+Rcv(netstrm_t *pThis, uchar *pRcvBuf, ssize_t *pLenBuf)
+{
+ DEFiRet;
+ ISOBJ_TYPE_assert(pThis, netstrm);
+
+ *pLenBuf = recv(pThis->sock, pRcvBuf, *pLenBuf, MSG_DONTWAIT);
+
+ RETiRet;
+}
+
+
+/* send a buffer. On entry, pLenBuf contains the number of octets to
+ * write. On exit, it contains the number of octets actually written.
+ * If this number is lower than on entry, only a partial buffer has
+ * been written.
+ * rgerhards, 2008-03-19
+ */
+rsRetVal
+Send(netstrm_t *pThis, uchar *pBuf, ssize_t *pLenBuf)
+{
+ ssize_t written;
+ DEFiRet;
+ ISOBJ_TYPE_assert(pThis, netstrm);
+
+ written = send(pThis->sock, pBuf, *pLenBuf, 0);
+
+ if(written == -1) {
+ switch(errno) {
+ case EAGAIN:
+ case EINTR:
+ /* this is fine, just retry... */
+ written = 0;
+ break;
+ default:
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ break;
+ }
+ }
+
+ *pLenBuf = written;
+finalize_it:
+ RETiRet;
+}
+
+
+/* open a connection to a remote host (server).
+ * rgerhards, 2008-03-19
+ */
+rsRetVal
+Connect(netstrm_t *pThis, int family, uchar *port, uchar *host)
+{
+ struct addrinfo *res = NULL;
+ struct addrinfo hints;
+
+ DEFiRet;
+ ISOBJ_TYPE_assert(pThis, netstrm);
+ assert(port != NULL);
+ assert(host != NULL);
+ assert(pThis->sock == -1);
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = family;
+ hints.ai_socktype = SOCK_STREAM;
+ if(getaddrinfo((char*)host, (char*)port, &hints, &res) != 0) {
+ dbgprintf("error %d in getaddrinfo\n", errno);
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
+
+ if((pThis->sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) {
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
+
+ if(connect(pThis->sock, res->ai_addr, res->ai_addrlen) != 0) {
+ ABORT_FINALIZE(RS_RET_IO_ERROR);
+ }
finalize_it:
+ if(res != NULL)
+ freeaddrinfo(res);
+
+ if(iRet != RS_RET_OK) {
+ if(pThis->sock != -1) {
+ close(pThis->sock);
+ pThis->sock = -1;
+ }
+ }
+
RETiRet;
}
@@ -229,7 +544,14 @@ CODESTARTobjQueryInterface(netstrm)
* work here (if we can support an older interface version - that,
* of course, also affects the "if" above).
*/
- //pIf->cvthname = cvthname;
+ pIf->Construct = netstrmConstruct;
+ pIf->ConstructFinalize = netstrmConstructFinalize;
+ pIf->Destruct = netstrmDestruct;
+ pIf->LstnInit = LstnInit;
+ pIf->AcceptConnReq = AcceptConnReq;
+ pIf->Rcv = Rcv;
+ pIf->Send = Send;
+ pIf->Connect = Connect;
finalize_it:
ENDobjQueryInterface(netstrm)
@@ -240,6 +562,7 @@ ENDobjQueryInterface(netstrm)
BEGINObjClassExit(netstrm, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(netstrm)
/* release objects we no longer need */
+ objRelease(net, CORE_COMPONENT);
objRelease(glbl, CORE_COMPONENT);
objRelease(errmsg, CORE_COMPONENT);
ENDObjClassExit(netstrm)
@@ -253,6 +576,7 @@ BEGINAbstractObjClassInit(netstrm, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(objUse(glbl, CORE_COMPONENT));
+ CHKiRet(objUse(net, CORE_COMPONENT));
/* set our own handlers */
ENDObjClassInit(netstrm)
generated by cgit (git 2.34.1) at 2024-11-16 11:19:40 +0000