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|
/* Opens a large number of tcp connections and sends
* messages over them. This is used for stress-testing.
*
* Params
* -t target address (default 127.0.0.1)
* -p target port (default 13514)
* -n number of target ports (targets are in range -p..(-p+-n-1)
* -c number of connections (default 1)
* -m number of messages to send (connection is random)
* -i initial message number (optional)
* -P PRI to be used for generated messages (default is 167).
* Specify the plain number without leading zeros
* -d amount of extra data to add to message. If present, the
* number itself will be added as third field, and the data
* bytes as forth. Add -r to randomize the amount of extra
* data included in the range 1..(value of -d).
* -r randomize amount of extra data added (-d must be > 0)
* -f support for testing dynafiles. If given, include a dynafile ID
* in the range 0..(f-1) as the SECOND field, shifting all field values
* one field to the right. Zero (default) disables this functionality.
* -M the message to be sent. Disables all message format options, as
* only that exact same message is sent.
* -I read specified input file, do NOT generate own test data. The test
* completes when eof is reached.
* -B The specified file (-I) is binary. No data processing is done by
* tcpflood. If multiple connections are specified, data is read in
* chunks and spread across the connections without taking any record
* delemiters into account.
* -C when input from a file is read, this file is transmitted -C times
* (C like cycle, running out of meaningful option switches ;))
*
* Part of the testbench for rsyslog.
*
* Copyright 2009, 2010 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rsyslog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/resource.h>
#define EXIT_FAILURE 1
#define INVALID_SOCKET -1
/* Name of input file, must match $IncludeConfig in test suite .conf files */
#define NETTEST_INPUT_CONF_FILE "nettest.input.conf" /* name of input file, must match $IncludeConfig in .conf files */
#define MAX_EXTRADATA_LEN 100*1024
static char *targetIP = "127.0.0.1";
static char *msgPRI = "167";
static int targetPort = 13514;
static int numTargetPorts = 1;
static int dynFileIDs = 0;
static int extraDataLen = 0; /* amount of extra data to add to message */
static int bRandomizeExtraData = 0; /* randomize amount of extra data added */
static int numMsgsToSend; /* number of messages to send */
static int numConnections = 1; /* number of connections to create */
static int *sockArray; /* array of sockets to use */
static int msgNum = 0; /* initial message number to start with */
static int bShowProgress = 1; /* show progress messages */
static char *MsgToSend = NULL; /* if non-null, this is the actual message to send */
static int bBinaryFile = 0; /* is -I file binary */
static char *dataFile = NULL; /* name of data file, if NULL, generate own data */
static int numFileIterations = 1;/* how often is file data to be sent? */
FILE *dataFP = NULL; /* file pointer for data file, if used */
/* open a single tcp connection
*/
int openConn(int *fd)
{
int sock;
struct sockaddr_in addr;
int port;
int retries = 0;
int rnd;
if((sock=socket(AF_INET, SOCK_STREAM, 0))==-1) {
perror("socket()");
return(1);
}
/* randomize port if required */
if(numTargetPorts > 1) {
rnd = rand(); /* easier if we need value for debug messages ;) */
port = targetPort + (rnd % numTargetPorts);
} else {
port = targetPort;
}
memset((char *) &addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if(inet_aton(targetIP, &addr.sin_addr)==0) {
fprintf(stderr, "inet_aton() failed\n");
return(1);
}
while(1) { /* loop broken inside */
if(connect(sock, (struct sockaddr*)&addr, sizeof(addr)) == 0) {
break;
} else {
if(retries++ == 50) {
perror("connect()");
fprintf(stderr, "connect() failed\n");
return(1);
} else {
usleep(100000); /* ms = 1000 us! */
}
}
}
*fd = sock;
return 0;
}
/* open all requested tcp connections
* this includes allocating the connection array
*/
int openConnections(void)
{
int i;
char msgBuf[128];
size_t lenMsg;
if(bShowProgress)
write(1, " open connections", sizeof(" open connections")-1);
sockArray = calloc(numConnections, sizeof(int));
for(i = 0 ; i < numConnections ; ++i) {
if(i % 10 == 0) {
if(bShowProgress)
printf("\r%5.5d", i);
//lenMsg = sprintf(msgBuf, "\r%5.5d", i);
//write(1, msgBuf, lenMsg);
}
if(openConn(&(sockArray[i])) != 0) {
printf("error in trying to open connection i=%d\n", i);
return 1;
}
}
lenMsg = sprintf(msgBuf, "\r%5.5d open connections\n", i);
write(1, msgBuf, lenMsg);
return 0;
}
/* we also close all connections because otherwise we may get very bad
* timing for the syslogd - it may not be able to process all incoming
* messages fast enough if we immediately shut down.
* TODO: it may be an interesting excercise to handle that situation
* at the syslogd level, too
* rgerhards, 2009-04-14
*/
void closeConnections(void)
{
int i;
size_t lenMsg;
char msgBuf[128];
if(bShowProgress)
write(1, " close connections", sizeof(" close connections")-1);
for(i = 0 ; i < numConnections ; ++i) {
if(i % 10 == 0) {
if(bShowProgress) {
lenMsg = sprintf(msgBuf, "\r%5.5d", i);
write(1, msgBuf, lenMsg);
}
}
close(sockArray[i]);
}
lenMsg = sprintf(msgBuf, "\r%5.5d close connections\n", i);
write(1, msgBuf, lenMsg);
}
/* generate the message to be sent according to program command line parameters.
* this has been moved to its own function as we now have various different ways
* of constructing test messages. -- rgerhards, 2010-03-31
*/
static inline void
genMsg(char *buf, size_t maxBuf, int *pLenBuf)
{
int edLen; /* actual extra data length to use */
char extraData[MAX_EXTRADATA_LEN + 1];
char dynFileIDBuf[128] = "";
static int numMsgsGen = 0;
int done;
if(dataFP != NULL) {
/* get message from file */
do {
done = 1;
*pLenBuf = fread(buf, 1, 1024, dataFP);
if(feof(dataFP)) {
if(--numFileIterations > 0) {
rewind(dataFP);
done = 0; /* need new iteration */
} else {
*pLenBuf = 0;
goto finalize_it;
}
}
} while(!done); /* Attention: do..while()! */
} else if(MsgToSend == NULL) {
if(dynFileIDs > 0) {
snprintf(dynFileIDBuf, maxBuf, "%d:", rand() % dynFileIDs);
}
if(extraDataLen == 0) {
*pLenBuf = snprintf(buf, maxBuf, "<%s>Mar 1 01:00:00 172.20.245.8 tag msgnum:%s%8.8d:\n",
msgPRI, dynFileIDBuf, msgNum);
} else {
if(bRandomizeExtraData)
edLen = ((long) rand() + extraDataLen) % extraDataLen + 1;
else
edLen = extraDataLen;
memset(extraData, 'X', edLen);
extraData[edLen] = '\0';
*pLenBuf = snprintf(buf, maxBuf, "<%s>Mar 1 01:00:00 172.20.245.8 tag msgnum:%s%8.8d:%d:%s\n",
msgPRI, dynFileIDBuf, msgNum, edLen, extraData);
}
} else {
/* use fixed message format from command line */
*pLenBuf = snprintf(buf, maxBuf, "%s\n", MsgToSend);
}
if(numMsgsGen++ >= numMsgsToSend)
*pLenBuf = 0; /* indicate end of run */
finalize_it: ;
}
/* send messages to the tcp connections we keep open. We use
* a very basic format that helps identify the message
* (via msgnum:<number>: e.g. msgnum:00000001:). This format is suitable
* for extracton to field-based properties.
* The first numConnection messages are sent sequentially, as are the
* last. All messages in between are sent over random connections.
* Note that message numbers start at 0.
*/
int sendMessages(void)
{
int i = 0;
int socknum;
int lenBuf;
int lenSend;
char *statusText;
char buf[MAX_EXTRADATA_LEN + 1024];
if(dataFile == NULL) {
printf("Sending %d messages.\n", numMsgsToSend);
statusText = "messages";
} else {
printf("Sending file '%s' %d times.\n", dataFile, numFileIterations);
statusText = "kb";
}
if(bShowProgress)
printf("\r%8.8d %s sent", 0, statusText);
while(1) { /* broken inside loop! */
if(i < numConnections)
socknum = i;
else if(i >= numMsgsToSend - numConnections)
socknum = i - (numMsgsToSend - numConnections);
else {
int rnd = rand();
//socknum = rand() % numConnections;
socknum = rnd % numConnections;
}
genMsg(buf, sizeof(buf), &lenBuf); /* generate the message to send according to params */
if(lenBuf == 0)
break; /* end of processing! */
lenSend = send(sockArray[socknum], buf, lenBuf, 0);
if(lenSend != lenBuf) {
printf("\r%5.5d\n", i);
fflush(stdout);
perror("send test data");
printf("send() failed at socket %d, index %d, msgNum %d\n",
sockArray[socknum], i, msgNum);
fflush(stderr);
return(1);
}
if(i % 100 == 0) {
if(bShowProgress)
printf("\r%8.8d", i);
}
++msgNum;
++i;
}
printf("\r%8.8d %s sent\n", i, statusText);
return 0;
}
/* send a message via TCP
* We open the connection on the initial send, and never close it
* (let the OS do that). If a conneciton breaks, we do NOT try to
* recover, so all test after that one will fail (and the test
* driver probably hang. returns 0 if ok, something else otherwise.
* We use traditional framing '\n' at EOR for this tester. It may be
* worth considering additional framing modes.
* rgerhards, 2009-04-08
*/
int
tcpSend(char *buf, int lenBuf)
{
static int sock = INVALID_SOCKET;
struct sockaddr_in addr;
if(sock == INVALID_SOCKET) {
/* first time, need to connect to target */
if((sock=socket(AF_INET, SOCK_STREAM, 0))==-1) {
perror("socket()");
return(1);
}
memset((char *) &addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(13514);
if(inet_aton("127.0.0.1", &addr.sin_addr)==0) {
fprintf(stderr, "inet_aton() failed\n");
return(1);
}
if(connect(sock, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
fprintf(stderr, "connect() failed\n");
return(1);
}
}
/* send test data */
if(send(sock, buf, lenBuf, 0) != lenBuf) {
perror("send test data");
fprintf(stderr, "send() failed\n");
return(1);
}
/* send record terminator */
if(send(sock, "\n", 1, 0) != 1) {
perror("send record terminator");
fprintf(stderr, "send() failed\n");
return(1);
}
return 0;
}
/* Run the test.
* rgerhards, 2009-04-03
*/
int main(int argc, char *argv[])
{
int ret = 0;
int opt;
struct sigaction sigAct;
static char buf[1024];
srand(time(NULL)); /* seed is good enough for our needs */
/* on Solaris, we do not HAVE MSG_NOSIGNAL, so for this reason
* we block SIGPIPE (not an issue for this program)
*/
memset(&sigAct, 0, sizeof(sigAct));
sigemptyset(&sigAct.sa_mask);
sigAct.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sigAct, NULL);
setvbuf(stdout, buf, _IONBF, 48);
if(!isatty(1))
bShowProgress = 0;
while((opt = getopt(argc, argv, "f:t:p:c:C:m:i:I:P:d:n:M:rB")) != -1) {
switch (opt) {
case 't': targetIP = optarg;
break;
case 'p': targetPort = atoi(optarg);
break;
case 'n': numTargetPorts = atoi(optarg);
break;
case 'c': numConnections = atoi(optarg);
break;
case 'C': numFileIterations = atoi(optarg);
break;
case 'm': numMsgsToSend = atoi(optarg);
break;
case 'i': msgNum = atoi(optarg);
break;
case 'P': msgPRI = optarg;
break;
case 'd': extraDataLen = atoi(optarg);
if(extraDataLen > MAX_EXTRADATA_LEN) {
fprintf(stderr, "-d max is %d!\n",
MAX_EXTRADATA_LEN);
exit(1);
}
break;
case 'r': bRandomizeExtraData = 1;
break;
case 'f': dynFileIDs = atoi(optarg);
break;
case 'M': MsgToSend = optarg;
break;
case 'I': dataFile = optarg;
/* in this mode, we do not know the num messages to send, so
* we set a (high) number to keep the code happy.
*/
numMsgsToSend = 1000000;
break;
case 'B': bBinaryFile = 1;
break;
default: printf("invalid option '%c' or value missing - terminating...\n", opt);
exit (1);
break;
}
}
if(numConnections > 20) {
/* if we use many (whatever this means, 20 is randomly picked)
* connections, we need to make sure we have a high enough
* limit. -- rgerhards, 2010-03-25
*/
struct rlimit maxFiles;
maxFiles.rlim_cur = numConnections + 20;
maxFiles.rlim_max = numConnections + 20;
if(setrlimit(RLIMIT_NOFILE, &maxFiles) < 0) {
perror("setrlimit to increase file handles failed");
exit(1);
}
}
if(dataFile != NULL) {
if((dataFP = fopen(dataFile, "r")) == NULL) {
perror(dataFile);
exit(1);
}
}
if(openConnections() != 0) {
printf("error opening connections\n");
exit(1);
}
if(sendMessages() != 0) {
printf("error sending messages\n");
exit(1);
}
printf("End of tcpflood Run\n");
exit(ret);
}
|