347 lines
8.8 KiB
C
347 lines
8.8 KiB
C
/******************************************************************************/
|
|
/* */
|
|
/* Copyright (c) International Business Machines Corp., 2005 */
|
|
/* */
|
|
/* This program 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 2 of the License, or */
|
|
/* (at your option) any later version. */
|
|
/* */
|
|
/* This program 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 this program; if not, write to the Free Software */
|
|
/* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
|
|
/* */
|
|
/******************************************************************************/
|
|
|
|
/*
|
|
* File:
|
|
* ns-udpclient.c
|
|
*
|
|
* Description:
|
|
* This is UDP traffic client.
|
|
* Send UDP datagram to a server, then receive datagram from it
|
|
*
|
|
* Author:
|
|
* Mitsuru Chinen <mitch@jp.ibm.com>
|
|
*
|
|
* History:
|
|
* Oct 19 2005 - Created (Mitsuru Chinen)
|
|
*---------------------------------------------------------------------------*/
|
|
|
|
#include "ns-traffic.h"
|
|
|
|
/*
|
|
* Fixed value
|
|
*/
|
|
#define MESSAGE_LEN 1000 /* The length of message */
|
|
#define RECVFROM_TIMEOUT 1 /* Timeout length of recvfrom() */
|
|
|
|
/*
|
|
* Gloval variables
|
|
*/
|
|
struct sigaction handler; /* Behavior for a signal */
|
|
int catch_sigalrm; /* When catch the SIGALRM, set to non-zero */
|
|
int catch_sighup; /* When catch the SIGHUP, set to non-zero */
|
|
|
|
/*
|
|
* Standard Header Files
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <netdb.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <netinet/in.h>
|
|
|
|
/*
|
|
* Function: usage()
|
|
*
|
|
* Descripton:
|
|
* Print the usage of this program. Then, terminate this program with
|
|
* the specified exit value.
|
|
*
|
|
* Argument:
|
|
* exit_value: exit value
|
|
*
|
|
* Return value:
|
|
* This function does not return.
|
|
*/
|
|
void usage(char *program_name, int exit_value)
|
|
{
|
|
FILE *stream = stdout; /* stream where the usage is output */
|
|
|
|
if (exit_value == EXIT_FAILURE)
|
|
stream = stderr;
|
|
|
|
fprintf(stream, "%s [OPTION]\n"
|
|
"\t-S\tname or IP address of the server\n"
|
|
"\t-f\tprotocol family\n"
|
|
"\t\t 4 : IPv4\n"
|
|
"\t\t 6 : IPv6\n"
|
|
"\t-p\tport number\n"
|
|
"\t-b\twork in the background\n"
|
|
"\t-d\tdisplay debug informations\n"
|
|
"\t-h\tdisplay this usage\n", program_name);
|
|
exit(exit_value);
|
|
}
|
|
|
|
/*
|
|
* Function: set_signal_flag()
|
|
*
|
|
* Description:
|
|
* This function sets global variables accordig to signal
|
|
*
|
|
* Argument:
|
|
* type: type of signal
|
|
*
|
|
* Return value:
|
|
* None
|
|
*/
|
|
void set_signal_flag(int type)
|
|
{
|
|
if (debug)
|
|
fprintf(stderr, "Catch signal. type is %d\n", type);
|
|
|
|
switch (type) {
|
|
case SIGHUP:
|
|
catch_sighup = 1;
|
|
handler.sa_handler = SIG_IGN;
|
|
if (sigaction(type, &handler, NULL) < 0)
|
|
fatal_error("sigaction()");
|
|
break;
|
|
|
|
case SIGALRM:
|
|
catch_sigalrm = 1;
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unexpected signal (%d) is caught\n", type);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
/*
|
|
*
|
|
* Function: main()
|
|
*
|
|
*/
|
|
int main(int argc, char *argv[])
|
|
{
|
|
char *program_name = argv[0];
|
|
int optc; /* option */
|
|
|
|
sa_family_t family; /* protocol family */
|
|
char *server_name; /* Name (or IP address) of the server */
|
|
char *portnum; /* port number in string representation */
|
|
|
|
int sock_fd; /* socket descriptor to access */
|
|
int on; /* on/off at an socket option */
|
|
|
|
struct addrinfo hints; /* hints for getaddrinfo() */
|
|
struct addrinfo *res; /* pointer to addrinfo structure */
|
|
int err; /* return value of getaddrinfo */
|
|
|
|
char *message; /* Pointer to the message */
|
|
char *recvbuf = NULL; /* Pointer to the message */
|
|
|
|
int background = 0; /* work in the background if non-zero */
|
|
|
|
debug = 0;
|
|
|
|
/* Initilalize the client information */
|
|
family = PF_UNSPEC;
|
|
server_name = NULL;
|
|
portnum = NULL;
|
|
|
|
/* Retrieve the options */
|
|
while ((optc = getopt(argc, argv, "S:f:p:bdh")) != EOF) {
|
|
switch (optc) {
|
|
case 'S':
|
|
server_name = strdup(optarg);
|
|
if (server_name == NULL) {
|
|
fprintf(stderr, "strdup() failed.");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
|
|
case 'f':
|
|
if (strncmp(optarg, "4", 1) == 0)
|
|
family = PF_INET; /* IPv4 */
|
|
else if (strncmp(optarg, "6", 1) == 0)
|
|
family = PF_INET6; /* IPv6 */
|
|
else {
|
|
fprintf(stderr,
|
|
"protocol family should be 4 or 6.\n");
|
|
usage(program_name, EXIT_FAILURE);
|
|
}
|
|
break;
|
|
|
|
case 'p':
|
|
{
|
|
unsigned long int tmp;
|
|
tmp = strtoul(optarg, NULL, 0);
|
|
if (tmp < PORTNUMMIN || PORTNUMMAX < tmp) {
|
|
fprintf(stderr,
|
|
"The range of port is from %u to %u\n",
|
|
PORTNUMMIN, PORTNUMMAX);
|
|
usage(program_name, EXIT_FAILURE);
|
|
}
|
|
portnum = strdup(optarg);
|
|
}
|
|
break;
|
|
|
|
case 'b':
|
|
background = 1;
|
|
break;
|
|
|
|
case 'd':
|
|
debug = 1;
|
|
break;
|
|
|
|
case 'h':
|
|
usage(program_name, EXIT_SUCCESS);
|
|
break;
|
|
|
|
default:
|
|
usage(program_name, EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
/* Check the family is specified. */
|
|
if (family == PF_UNSPEC) {
|
|
fprintf(stderr, "protocol family isn't specified.\n");
|
|
usage(program_name, EXIT_FAILURE);
|
|
}
|
|
|
|
/* Check the server name is specified. */
|
|
if (server_name == NULL) {
|
|
fprintf(stderr, "server name isn't specified.\n");
|
|
usage(program_name, EXIT_FAILURE);
|
|
}
|
|
|
|
/* Check the port number is specified. */
|
|
if (portnum == NULL) {
|
|
fprintf(stderr, "port number isn't specified.\n");
|
|
usage(program_name, EXIT_FAILURE);
|
|
}
|
|
|
|
/* If -b option is specified, work as a daemon */
|
|
if (background)
|
|
if (daemon(0, 0) < 0)
|
|
fatal_error("daemon()");
|
|
|
|
/* Set a signal handler against SIGALRM */
|
|
handler.sa_handler = set_signal_flag;
|
|
handler.sa_flags = 0;
|
|
if (sigfillset(&handler.sa_mask) < 0)
|
|
fatal_error("sigfillset()");
|
|
if (sigaction(SIGALRM, &handler, NULL) < 0)
|
|
fatal_error("sigaction()");
|
|
|
|
/* At first, SIGHUP are Ignored. */
|
|
handler.sa_handler = SIG_IGN;
|
|
if (sigaction(SIGHUP, &handler, NULL) < 0)
|
|
fatal_error("sigaction()");
|
|
|
|
/* Set the hints to addrinfo() */
|
|
memset(&hints, '\0', sizeof(struct addrinfo));
|
|
hints.ai_family = family;
|
|
hints.ai_socktype = SOCK_DGRAM;
|
|
hints.ai_protocol = IPPROTO_UDP;
|
|
|
|
err = getaddrinfo(server_name, portnum, &hints, &res);
|
|
if (err) {
|
|
fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(err));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (res->ai_next) {
|
|
fprintf(stderr, "getaddrinfo(): multiple address is found.");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* Create a socket */
|
|
sock_fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
|
|
if (sock_fd < 0)
|
|
fatal_error("socket()");
|
|
|
|
/* Enable to reuse the socket */
|
|
on = 1;
|
|
if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(int)))
|
|
fatal_error("setsockopt()");
|
|
|
|
/* Create a message */
|
|
message = malloc(MESSAGE_LEN);
|
|
if (debug) {
|
|
strncpy(message, "Hello!", MESSAGE_LEN);
|
|
message[MESSAGE_LEN - 1] = '\0';
|
|
}
|
|
|
|
/* Prepare the buffer to store the received message */
|
|
recvbuf = malloc(MESSAGE_LEN + 1);
|
|
if (recvbuf == NULL) {
|
|
fprintf(stderr, "malloc() is failed.\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/*
|
|
* Loop for access to the server
|
|
*/
|
|
handler.sa_handler = set_signal_flag;
|
|
if (sigaction(SIGHUP, &handler, NULL) < 0)
|
|
fatal_error("sigaction()");
|
|
for (;;) {
|
|
int recvlen; /* lenght of recevied message */
|
|
struct sockaddr_storage from_addr; /* address of a client */
|
|
socklen_t from_addr_len; /* length of `client_addr' */
|
|
|
|
/* Send the message to the server */
|
|
if (sendto(sock_fd, message, MESSAGE_LEN, 0,
|
|
res->ai_addr, res->ai_addrlen) != MESSAGE_LEN) {
|
|
if (catch_sighup)
|
|
break;
|
|
else
|
|
fatal_error("sendto()");
|
|
}
|
|
|
|
/* Receive the response from the server */
|
|
from_addr_len = sizeof(from_addr);
|
|
alarm(RECVFROM_TIMEOUT);
|
|
if ((recvlen = recvfrom(sock_fd, recvbuf, MESSAGE_LEN, 0,
|
|
(struct sockaddr *)&from_addr,
|
|
&from_addr_len)) < 0) {
|
|
if (errno == EINTR) {
|
|
if (catch_sighup) {
|
|
break;
|
|
} else if (catch_sigalrm) {
|
|
if (debug)
|
|
fprintf(stderr,
|
|
"recvfrom() is timeout\n");
|
|
continue;
|
|
}
|
|
}
|
|
fatal_error("recvfrom()");
|
|
}
|
|
alarm(0);
|
|
recvbuf[recvlen] = '\0';
|
|
if (debug)
|
|
fprintf(stderr, "Message is %s\n", recvbuf);
|
|
|
|
/* Catch sighup */
|
|
if (catch_sighup)
|
|
break;
|
|
}
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|