summaryrefslogtreecommitdiffstats
path: root/plugins/omudpspoof/omudpspoof.c
diff options
context:
space:
mode:
Diffstat (limited to 'plugins/omudpspoof/omudpspoof.c')
-rw-r--r--plugins/omudpspoof/omudpspoof.c58
1 files changed, 31 insertions, 27 deletions
diff --git a/plugins/omudpspoof/omudpspoof.c b/plugins/omudpspoof/omudpspoof.c
index 33f644e4..c041eec5 100644
--- a/plugins/omudpspoof/omudpspoof.c
+++ b/plugins/omudpspoof/omudpspoof.c
@@ -104,6 +104,8 @@ typedef struct _instanceData {
u_short sourcePort;
u_short sourcePortStart; /* for sorce port iteration */
u_short sourcePortEnd;
+ libnet_t *libnet_handle;
+ char errbuf[LIBNET_ERRBUF_SIZE];
} instanceData;
#define DFLT_SOURCE_PORT_START 32000
@@ -167,8 +169,6 @@ ENDinitConfVars
/* add some variables needed for libnet */
-libnet_t *libnet_handle;
-char errbuf[LIBNET_ERRBUF_SIZE];
pthread_mutex_t mutLibnet;
/* forward definitions */
@@ -310,6 +310,7 @@ ENDfreeCnf
BEGINcreateInstance
CODESTARTcreateInstance
+finalize_it:
ENDcreateInstance
@@ -379,6 +380,18 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
bSendSuccess = RSFALSE;
d_pthread_mutex_lock(&mutLibnet);
bNeedUnlock = 1;
+/* Initialize the libnet library. Root priviledges are required.
+* this initializes a IPv4 socket to use for forging UDP packets.
+*/
+pData->libnet_handle = libnet_init(
+ LIBNET_RAW4, /* injection type */
+ NULL, /* network interface */
+ pData->errbuf); /* errbuf */
+
+if(pData->libnet_handle == NULL) {
+ errmsg.LogError(0, NO_ERRCODE, "Error initializing libnet, can not continue ");
+ ABORT_FINALIZE(RS_RET_ERR_LIBNET_INIT);
+}
for (r = pData->f_addr; r && bSendSuccess == RSFALSE ; r = r->ai_next) {
tempaddr = (struct sockaddr_in *)r->ai_addr;
/* Getting max payload size (must be multiple of 8) */
@@ -396,7 +409,7 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
}
DBGPRINTF("omudpspoof: stage 1: MF:%d, hdrOffs %d, pktLen %d\n",
(hdrOffs & IP_MF) >> 13, (hdrOffs & 0x1FFF) << 3, pktLen);
- libnet_clear_packet(libnet_handle);
+ libnet_clear_packet(pData->libnet_handle);
/* note: libnet does need ports in host order NOT in network byte order! -- rgerhards, 2009-11-12 */
udp = libnet_build_udp(
ntohs(pData->sourcePort),/* source port */
@@ -405,10 +418,10 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
0, /* checksum */
(u_char*)msg, /* payload */
pktLen, /* payload size */
- libnet_handle, /* libnet handle */
+ pData->libnet_handle, /* libnet handle */
udp); /* libnet id */
if (udp == -1) {
- DBGPRINTF("omudpspoof: can't build UDP header: %s\n", libnet_geterror(libnet_handle));
+ DBGPRINTF("omudpspoof: can't build UDP header: %s\n", libnet_geterror(pData->libnet_handle));
}
ip = libnet_build_ipv4(
@@ -423,17 +436,19 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
tempaddr->sin_addr.s_addr,
NULL, /* payload */
0, /* payload size */
- libnet_handle, /* libnet handle */
+ pData->libnet_handle, /* libnet handle */
ip); /* libnet id */
if (ip == -1) {
- DBGPRINTF("omudpspoof: can't build IP header: %s\n", libnet_geterror(libnet_handle));
+ DBGPRINTF("omudpspoof: can't build IP header: %s\n", libnet_geterror(pData->libnet_handle));
}
/* Write it to the wire. */
- lsent = libnet_write(libnet_handle);
+dbgprintf("DDDD: omudpspoof fd %d\n", pData->libnet_handle->fd);
+ lsent = libnet_write(pData->libnet_handle);
+ dbgprintf("DDDD: omudpspoof stage 1 return state %d (expected %d)\n", lsent, (int) (LIBNET_IPV4_H+LIBNET_UDP_H+pktLen));
if(lsent != (int) (LIBNET_IPV4_H+LIBNET_UDP_H+pktLen)) {
DBGPRINTF("omudpspoof: write error (total len %d): pktLen %d, sent %d: %s\n",
- len, LIBNET_IPV4_H+LIBNET_UDP_H+pktLen, lsent, libnet_geterror(libnet_handle));
+ len, LIBNET_IPV4_H+LIBNET_UDP_H+pktLen, lsent, libnet_geterror(pData->libnet_handle));
if(lsent != -1) {
bSendSuccess = RSTRUE;
}
@@ -443,7 +458,7 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
msgOffs += pktLen;
/* We need to get rid of the UDP header to build the other fragments */
- libnet_clear_packet(libnet_handle);
+ libnet_clear_packet(pData->libnet_handle);
ip = LIBNET_PTAG_INITIALIZER;
while(len > msgOffs ) { /* loop until all payload is sent */
/* check if there will be more fragments */
@@ -472,16 +487,17 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
tempaddr->sin_addr.s_addr,
(u_int8_t*)(msg+msgOffs), /* payload */
pktLen, /* payload size */
- libnet_handle, /* libnet handle */
+ pData->libnet_handle, /* libnet handle */
ip); /* libnet id */
if (ip == -1) {
- DBGPRINTF("omudpspoof: can't build IP fragment header: %s\n", libnet_geterror(libnet_handle));
+ DBGPRINTF("omudpspoof: can't build IP fragment header: %s\n", libnet_geterror(pData->libnet_handle));
}
/* Write it to the wire. */
- lsent = libnet_write(libnet_handle);
+ lsent = libnet_write(pData->libnet_handle);
+ dbgprintf("DDDD: omudpspoof stage 1 return state %d (expected %d)\n", lsent, (int) (LIBNET_IPV4_H+pktLen));
if(lsent != (int) (LIBNET_IPV4_H+pktLen)) {
DBGPRINTF("omudpspoof: fragment write error len %d, sent %d: %s\n",
- LIBNET_IPV4_H+LIBNET_UDP_H+len, lsent, libnet_geterror(libnet_handle));
+ LIBNET_IPV4_H+LIBNET_UDP_H+len, lsent, libnet_geterror(pData->libnet_handle));
bSendSuccess = RSFALSE;
continue;
}
@@ -491,6 +507,7 @@ UDPSend(instanceData *pData, uchar *pszSourcename, char *msg, size_t len)
finalize_it:
if(bNeedUnlock) {
+libnet_destroy(pData->libnet_handle);
d_pthread_mutex_unlock(&mutLibnet);
}
RETiRet;
@@ -738,7 +755,6 @@ freeConfigVars(void)
BEGINmodExit
CODESTARTmodExit
/* destroy the libnet state needed for forged UDP sources */
- libnet_destroy(libnet_handle);
pthread_mutex_destroy(&mutLibnet);
/* release what we no longer need */
objRelease(errmsg, CORE_COMPONENT);
@@ -779,18 +795,6 @@ CODEmodInit_QueryRegCFSLineHdlr
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(objUse(net,LM_NET_FILENAME));
- /* Initialize the libnet library. Root priviledges are required.
- * this initializes a IPv4 socket to use for forging UDP packets.
- */
- libnet_handle = libnet_init(
- LIBNET_RAW4, /* injection type */
- NULL, /* network interface */
- errbuf); /* errbuf */
-
- if(libnet_handle == NULL) {
- errmsg.LogError(0, NO_ERRCODE, "Error initializing libnet, can not continue ");
- ABORT_FINALIZE(RS_RET_ERR_LIBNET_INIT);
- }
pthread_mutex_init(&mutLibnet, NULL);
CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspoofdefaulttemplate", 0, eCmdHdlrGetWord, setLegacyDfltTpl, NULL, NULL));
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-17 18:33:10 +0000