added new test case for many tcp connections

It is checked that many tcp connections are properly handled. While
adding this test, I noticed that there is a bug in imtcp that prevents
creation of more than 200 connections. This bug still exists, so the
test suite currently fails (what is correct). Will be addressed soon.

1 files changed, 245 insertions, 0 deletions

diff --git a/tests/tcpflood.c b/tests/tcpflood.c
new file mode 100644
index 00000000..cecec628
--- /dev/null
+++ b/tests/tcpflood.c
@@ -0,0 +1,245 @@
+/* Opens a large number of tcp connections and sends
+ * messages over them. This is used for stress-testing.
+ *
+ * Params
+ * argv[1]	target address
+ * argv[2]	target port
+ * argv[3]	number of connections
+ * argv[4]	number of messages to send (connection is random)
+ *
+ * Part of the testbench for rsyslog.
+ *
+ * Copyright 2009 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 <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <assert.h>
+#include <unistd.h>
+#include <string.h>
+#include <netinet/in.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 */
+
+static char *targetIP;
+static int targetPort;
+static int numMsgsToSend; /* number of messages to send */
+static int numConnections; /* number of connections to create */
+static int *sockArray;  /* array of sockets to use */
+
+
+/* open a single tcp connection
+ */
+int openConn(int *fd)
+{
+	int sock;
+	struct sockaddr_in addr;
+
+	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(targetPort);
+	if(inet_aton(targetIP, &addr.sin_addr)==0) {
+		fprintf(stderr, "inet_aton() failed\n");
+		return(1);
+	}
+	if(connect(sock, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
+		perror("connect()");
+		fprintf(stderr, "connect() failed\n");
+		return(1);
+	}
+
+	*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;
+
+	write(1, "      open connections", sizeof("      open connections")-1);
+	sockArray = calloc(numConnections, sizeof(int));
+	for(i = 0 ; i < numConnections ; ++i) {
+		if(i % 10 == 0) {
+			lenMsg = sprintf(msgBuf, "\retb\b\b\b\b%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, "\retb\b\b\b\b%5.5d open connections\n", i);
+	write(1, msgBuf, lenMsg);
+
+	return 0;
+}
+
+
+/* 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;
+	int socknum;
+	int lenBuf;
+	char buf[2048];
+	char msgBuf[128];
+	size_t lenMsg;
+
+	srand(time(NULL));	/* seed is good enough for our needs */
+
+	lenMsg = sprintf(msgBuf, "\retb\b\b\b\b%5.5d messages sent", 0);
+	write(1, msgBuf, lenMsg);
+	for(i = 0 ; i < numMsgsToSend ; ++i) {
+		if(i < numConnections)
+			socknum = i;
+		else if(i >= numMsgsToSend - numConnections)
+			socknum = i - (numMsgsToSend - numConnections);
+		else
+			socknum = rand() % numConnections;
+		lenBuf = sprintf(buf, "<167>Mar  1 01:00:00 172.20.245.8 tag msgnum:%8.8d:\n", i);
+		if(send(sockArray[socknum], buf, lenBuf, 0) != lenBuf) {
+			perror("send test data");
+			fprintf(stderr, "send() failed\n");
+			return(1);
+		}
+		if(i % 100 == 0) {
+			lenMsg = sprintf(msgBuf, "\retb\b\b\b\b%5.5d", i);
+			write(1, msgBuf, lenMsg);
+		}
+	}
+	lenMsg = sprintf(msgBuf, "\retb\b\b\b\b%5.5d messages sent\n", i);
+	write(1, msgBuf, lenMsg);
+
+	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 suite. This must be called with exactly one parameter, the
+ * name of the test suite. For details, see file header comment at the top
+ * of this file.
+ * rgerhards, 2009-04-03
+ */
+int main(int argc, char *argv[])
+{
+	int ret = 0;
+	static char buf[1024];
+
+	setvbuf(stdout, _IONBF, buf, 48);
+
+	if(argc != 5) {
+		printf("Invalid call of tcpflood\n");
+		printf("Usage: nettester testsuite-name input\n");
+		exit(1);
+	}
+	
+	targetIP = argv[1];
+	targetPort = atoi(argv[2]);
+	numConnections = atoi(argv[3]);
+	numMsgsToSend = atoi(argv[4]);
+
+	if(openConnections() != 0) {
+		printf("error opening connections\n");
+		exit(1);
+	}
+
+	if(sendMessages() != 0) {
+		printf("error sending messages\n");
+		exit(1);
+	}
+	exit(ret);
+}