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/* a very simplistic tcp receiver for the rsyslog testbench.
*
* Copyright 2016 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <unistd.h>
#include <arpa/inet.h>
#if defined(__FreeBSD__)
#include <netinet/in.h>
#endif
static void
errout(char *reason)
{
perror(reason);
exit(1);
}
static void
usage(void)
{
fprintf(stderr, "usage: minitcpsrvr -t ip-addr -p port -f outfile\n");
exit (1);
}
int
main(int argc, char *argv[])
{
int fds;
int fdc;
int fdf = -1;
struct sockaddr_in srvAddr;
struct sockaddr_in cliAddr;
unsigned int srvAddrLen;
unsigned int cliAddrLen;
char wrkBuf[4096];
ssize_t nRead;
int opt;
int sleeptime = 0;
char *targetIP = NULL;
int targetPort = -1;
while((opt = getopt(argc, argv, "t:p:f:s:")) != -1) {
switch (opt) {
case 's':
sleeptime = atoi(optarg);
break;
case 't':
targetIP = optarg;
break;
case 'p':
targetPort = atoi(optarg);
break;
case 'f':
if(!strcmp(optarg, "-")) {
fdf = 1;
} else {
fdf = open(optarg, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR|S_IWUSR);
if(fdf == -1) errout(argv[3]);
}
break;
default:
fprintf(stderr, "invalid option '%c' or value missing - terminating...\n", opt);
usage();
break;
}
}
if(targetIP == NULL) {
fprintf(stderr, "-t parameter missing -- terminating\n");
usage();
}
if(targetPort == -1) {
fprintf(stderr, "-p parameter missing -- terminating\n");
usage();
}
if(fdf == -1) {
fprintf(stderr, "-f parameter missing -- terminating\n");
usage();
}
if(sleeptime) {
printf("minitcpsrv: deliberate sleep of %d seconds\n", sleeptime);
sleep(sleeptime);
printf("minitcpsrv: end sleep\n");
}
fds = socket(AF_INET, SOCK_STREAM, 0);
srvAddr.sin_family = AF_INET;
srvAddr.sin_addr.s_addr = inet_addr(targetIP);
srvAddr.sin_port = htons(targetPort);
srvAddrLen = sizeof(srvAddr);
if(bind(fds, (struct sockaddr *)&srvAddr, srvAddrLen) != 0)
errout("bind");
if(listen(fds, 20) != 0) errout("listen");
cliAddrLen = sizeof(cliAddr);
fdc = accept(fds, (struct sockaddr *)&cliAddr, &cliAddrLen);
while(1) {
nRead = read(fdc, wrkBuf, sizeof(wrkBuf));
if(nRead == 0) break;
if(write(fdf, wrkBuf, nRead) != nRead)
errout("write");
}
/* let the OS do the cleanup */
fprintf(stderr, "minitcpsrv terminates itself\n");
return 0;
}
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