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client2.c
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client2.c
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/* Copyright (c) 2015 Rutgers University and Richard P. Martin.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* IN NO EVENT SHALL RUTGERS UNIVERSITY BE LIABLE TO ANY PARTY FOR DIRECT,
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RUTGERS
* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* RUTGERS UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND RUTGERS UNIVERSITY HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
*
* Author: Richard P. Martin
* Version: 1
* Creation Date: Tue Mar 10 12:09:54 EDT 2015
* Filename: client2.c
*/
/* this is the CS 352 spring 2015 client program for the project part 2
* Students must complete the sock352 calls for this library for this client to work
* with the corresponding server. See sock352.h for the definition
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <fcntl.h>
#include <time.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <openssl/md5.h>
#include "sock352.h"
#define BUFFER_SIZE 8192
#define MAX_ZERO_BYTE_READS 1000000
void usage() {
printf("client2: usage: -f <remote filename> -o <output file> -d <destination> -u <udp-port> -l <local-port> -r <remote-port> \n");
}
/* timer function that returns the lapsed number of micro-seconds since epoch
* (epoch is Jan 1, 1970 ) */
uint64_t lapsed_usec(struct timeval * start, struct timeval *end){
uint64_t bt, be; /* start, end times as 64 bit integers */
bt = (uint64_t) start->tv_sec *(1000000) + (uint64_t )start->tv_usec;
be = (uint64_t) end->tv_sec *(1000000) + (uint64_t ) end->tv_usec;
/* make sure we don't return a negative time */
if (be >= bt) {
return (be-bt);
}
else {
printf("client2: lapsed_usec: warning, negative time interval\n");
return 0;
}
} /* end lapsed_usec */
int main(int argc, char *argv[], char *envp[]) {
char *server_filename; /* name of file to give to the server */
char *output_filename; /* name of file to write locally */
int output_fd; /* file descriptor for the output file (downloaded from the server) */
uint32_t file_size; /* size of the file, in bytes */
uint32_t file_size_network; /* size of the file in network byte order */
char *destination; /* name of the server, or server's IP address */
sockaddr_sock352_t dest_addr; /* destination address as a CS 352 socket address */
int dest_sock; /* destination socket address */
uint32_t cs352_port; /* CS 352 port space port */
uint32_t udp_port; /* UDP to run the CS 352 sockets over */
uint32_t local_port; /* UDP port to use as the local listen address */
uint32_t remote_port; /* UDP port to use as the remote destination address */
struct hostent *hp; /* the host pointer for resolving names */
char buffer[BUFFER_SIZE]; /* read/write buffer */
static const char command_name_s[] = "GET "; /* these are the command and protocol strings used to download the file */
static const char protocol_name_s[] = "CS352/1.0 \n";
int command_len, protocol_len,filename_len; /* lengths of the command and protocol strings */
char *server_command_s; /* string to send to the server with the command name, filename and protocol name */
int end_of_file, total_bytes, bytes_read,zero_bytes,socket_closed;
int bw; /* bytes written */
struct timeval begin_time, end_time; /* start, end time to compute bandwidth */
uint64_t lapsed_useconds; /* micro-seconds since epoch */
double lapsed_seconds; /* difference from start and stop of the timer */
server_filename = output_filename = NULL;
/* set defaults */
udp_port = SOCK352_DEFAULT_UDP_PORT;
local_port = remote_port = 0;
/* these support computing the file checksum */
MD5_CTX md5_context;
unsigned char md5_out[MD5_DIGEST_LENGTH];
int retval; /* return code for library operations */
int c,i; /* index pointers */
/* Parse the arguments to get the input file name, port, and destination */
opterr = 0;
while ((c = getopt (argc, argv, "f:o:d:u:l:r:")) != -1) {
switch (c) {
case 'f':
server_filename = optarg;
break;
case 'o':
output_filename = optarg;
break;
case 'c':
cs352_port = atoi(optarg);
break;
case 'u':
udp_port = atoi(optarg);
break;
case 'd':
destination = optarg;
break;
case 'l':
local_port = atoi(optarg);
break;
case 'r':
remote_port = atoi(optarg);
break;
case '?':
usage();
exit(-1);
break;
default:
printf("client2: unknown option: ");
usage();
exit(-1);
break;
}
}
/* check that we have a filename to give to the server */
if (server_filename == NULL) {
printf("client2: no remote file name specified: ");
usage();
exit(-1);
}
/* check that we have a filename to write the above locally */
if (output_filename == NULL) {
printf("client2: no local output file name specified: ");
usage();
exit(-1);
}
/* open the local file for writing */
if ( (output_fd = open(output_filename,O_CREAT|O_WRONLY) ) < 0) {
printf("client2: error: open of output file %s failed: %s \n", output_filename,
strerror(errno));
exit(-1);
}
/* check that we have a server */
if (destination == NULL) {
printf("client2: no remote host name or IP address specified\n");
usage();
exit(-1);
}
/* set the destination address */
dest_addr.sin_family = AF_CS352;
dest_addr.sin_port = htons(udp_port);
/* If an internet "a.d.c.d" address is specified, use inet_addr()
* to convert it into real address. If host name is specified,
* use gethostbyname() to resolve its address */
dest_addr.sin_addr.s_addr = inet_addr(destination); /* if a decimal "a.b.c.d" format */
if (dest_addr.sin_addr.s_addr == -1) {
hp = gethostbyname(destination); /* if DNS name, e.g. x.y.com */
if (hp == NULL) {
printf("client2: host name %s not found\n", destination);
exit(-1);
}
memcpy(&(dest_addr.sin_addr),hp->h_addr, hp->h_length);
}
/* change which init function to use based on the arguments */
/* if BOTH the local and remote ports are set, use the init2 function */
if ( (remote_port > 0) && (local_port > 0) ) {
retval = sock352_init3(remote_port, local_port, envp);
} else {
retval = sock352_init(udp_port);
}
if (retval == SOCK352_FAILURE) {
fprintf(stderr,"client2: initialization of 352 sockets on UDP port %d failed\n",udp_port);
exit(-1);
}
/* Create a CS 352 stream socket */
if ( (dest_sock = sock352_socket(AF_CS352, SOCK_STREAM, 0)) == -1 ) {
printf("client2: sock called failed \n");
exit(-1);
}
/* construct the string that tells the server what file to get and what protocol we are using */
server_command_s = buffer;
command_len = strlen(command_name_s);
protocol_len = strlen(protocol_name_s);
/* truncate filename length if too long */
filename_len = (strlen(server_filename) < BUFFER_SIZE-(command_len+protocol_len+2)) ?
strlen(server_filename) : BUFFER_SIZE-(command_len+protocol_len+2);
strcpy(server_command_s,command_name_s);
server_command_s += command_len;
strncpy(server_command_s,server_filename,filename_len);
server_command_s += filename_len;
server_command_s[0] = ' '; server_command_s++; /* add a whitespace */
strcpy(server_command_s,protocol_name_s);
/* begin the sending process*/
MD5_Init(&md5_context);
gettimeofday(&begin_time, (struct timezone *) NULL); /* get a start timestamp */
if ( sock352_connect(dest_sock, &dest_addr, sizeof(dest_addr)) != SOCK352_SUCCESS) {
printf("client2: connect failed");
exit(-1);
}
/* write the name of the file */
sock352_write(dest_sock,buffer,strlen(buffer));
/* read the size of the file*/
sock352_read(dest_sock,&file_size_network,sizeof(file_size_network));
file_size = htonl((int) file_size_network);
/* initialize test variables correctly */
total_bytes = zero_bytes = socket_closed = 0;
/* loop until we either get the whole file or there is an error */
while ( (total_bytes < file_size) && (! socket_closed)) {
bytes_read = sock352_read(dest_sock,buffer,BUFFER_SIZE);
if (bytes_read > 0) {
total_bytes += bytes_read;
bw = write(output_fd,buffer,bytes_read);
if (bw != bytes_read) {
printf("client2: error writing to file at byte %d \n", total_bytes);
} else {
MD5_Update(&md5_context, buffer, bytes_read);
}
} else {
if (bytes_read == 0) {
zero_bytes++;
} else {
if (bytes_read < 0 ){
socket_closed = 1;
}
}
}
if (zero_bytes > MAX_ZERO_BYTE_READS) {
printf("server: too many zero byte returns, closing connection\n");
socket_closed = 1;
}
} /* end while socket not closed */
if ( zero_bytes > 0) printf("client2: zero byte calls is %d \n",zero_bytes);
sock352_close(dest_sock);
gettimeofday(&end_time, (struct timezone *) NULL); /* end time-stamp */
MD5_Final(md5_out, &md5_context);
if ( close(output_fd) < 0) { /* clean up the file descriptor */
printf("client2: error closing the file \n");
}
lapsed_useconds = lapsed_usec(&begin_time, &end_time);
lapsed_seconds = (double) lapsed_useconds / (double) 1000000;
if (total_bytes == 0) {
printf("client2: no file received\n");
exit(-1);
}
printf("client2: received %d bytes in %lf sec, bandwidth %8.4lf Mb/s \n", total_bytes,lapsed_seconds,
( (double) total_bytes/ (double) (1048576*8)) /lapsed_seconds );
printf("client2: MD5-checksum: ");
for(i=0; i < MD5_DIGEST_LENGTH; i++)
printf("%02x", md5_out[i]);
printf("\n");
return 0;
}