MESSAGE
| DATE | 2015-03-08 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [LIU Comp Sci] Operating systems HW
|
From owner-learn-outgoing-at-mrbrklyn.com Sun Mar 8 20:23:17 2015
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Date: Sun, 08 Mar 2015 20:22:51 -0400
From: Ruben Safir
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To: mohammed Ghriga
Subject: [LIU Comp Sci] Operating systems HW
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--------------030300070906050409080202
Content-Type: text/plain; charset=utf-8
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I lost track of what the home work was, but before I moved forward
answering quiz questions, I wanted to tackle some of the coding
assignments in Chapter 2, because I thought I could learn a lot more
from them. So I did read Cpt 2 and 3, but I wanted to finish this which
was good because I completely forgot a number of things about fstat,
fopen and the use of strace, I had never done that before actually
although I am familiar and used extensively nm. I made a lot of
blunders on the way to finishing this, but others might benefit from
this as well. I'm going on to doing the kernel programming tonight, I
hope and tackle chapter 3 'quiz' questions at school in the AM before class.
Ruben
#include
#include
#include
#include
#include
char buf[500] = {0};
char buf2[500] = {0};
char * buf3;
int fd, ret;
size_t len;
const char * PASSWD = "/etc/passwd";
off_t tmpsize;
struct stat filetmp;
FILE * INPUT;
FILE * OUTPUT;
int main( int argc, char * argv[])
{
puts ("Enter a file to copy\n");
if ( ! fgets( buf, 500, stdin) )
return EXIT_FAILURE;
len = strlen(buf);
buf[len-1] = 0;
puts ("Enter the file to copy to\n");
if ( ! fgets( buf2, 500, stdin) )
return EXIT_FAILURE;
len = strlen(buf2);
buf2[len-1] = 0;
if( access( buf, F_OK|R_OK ) == 0 ) {
INPUT = fopen( buf, "r");
if (INPUT == NULL){
printf("Can't Open %s\n", buf);
exit(EXIT_FAILURE);
}
}else{
perror("access INPUT file stat");
exit (EXIT_FAILURE);
}
//File Opened for reading
fd = fileno(INPUT);
if (fstat(fd, &filetmp ) == -1){
perror("stat on reading file:");
exit(EXIT_FAILURE);
}
//FILE IS STATTED
tmpsize = filetmp.st_size;
if( (buf3 = (char *) malloc( sizeof(int) * tmpsize)) == NULL)
exit (EXIT_FAILURE);
ret = fread(buf3, tmpsize, 1, INPUT);
if( ret != 1){
fprintf(stderr, "Read not complete: Req ==> %d Rec ==> %zu \n",
ret, tmpsize);
exit(EXIT_FAILURE);
}
OUTPUT = fopen(buf2, "w");
if(OUTPUT == NULL){
printf("Can't Open %s\n ", buf2);
exit(EXIT_FAILURE);
}
//File Open for Writing
ret = fwrite(buf3, tmpsize, 1, OUTPUT);
if(ret != 1){
perror("WRITE");
fprintf(stderr, "WRITE not complete: Req ==> %d Rec ==> %zu\n",
ret, tmpsize);
exit(EXIT_FAILURE);
}
free(buf3);
fclose(INPUT);
fclose(OUTPUT);
return 1;
}
execve("./a.out", ["./a.out"], [/* 55 vars */]) = 0
brk(0) = 0x68b000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fdb000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
directory)
open("/home/ruben/GNUstep/Library/Libraries/tls/x86_64/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/home/ruben/GNUstep/Library/Libraries/tls/x86_64", 0x7fffd1634d10)
= -1 ENOENT (No such file or directory)
open("/home/ruben/GNUstep/Library/Libraries/tls/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/home/ruben/GNUstep/Library/Libraries/tls", 0x7fffd1634d10) = -1
ENOENT (No such file or directory)
open("/home/ruben/GNUstep/Library/Libraries/x86_64/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/home/ruben/GNUstep/Library/Libraries/x86_64", 0x7fffd1634d10) =
-1 ENOENT (No such file or directory)
open("/home/ruben/GNUstep/Library/Libraries/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/home/ruben/GNUstep/Library/Libraries", 0x7fffd1634d10) = -1
ENOENT (No such file or directory)
open("/root/GNUstep/Library/Libraries/tls/x86_64/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/root/GNUstep/Library/Libraries/tls/x86_64", 0x7fffd1634d10) = -1
ENOENT (No such file or directory)
open("/root/GNUstep/Library/Libraries/tls/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/root/GNUstep/Library/Libraries/tls", 0x7fffd1634d10) = -1 ENOENT
(No such file or directory)
open("/root/GNUstep/Library/Libraries/x86_64/libc.so.6",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/root/GNUstep/Library/Libraries/x86_64", 0x7fffd1634d10) = -1
ENOENT (No such file or directory)
open("/root/GNUstep/Library/Libraries/libc.so.6", O_RDONLY|O_CLOEXEC) =
-1 ENOENT (No such file or directory)
stat("/root/GNUstep/Library/Libraries", 0x7fffd1634d10) = -1 ENOENT (No
such file or directory)
open("/usr/lib/tls/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT
(No such file or directory)
stat("/usr/lib/tls/x86_64", 0x7fffd1634d10) = -1 ENOENT (No such file or
directory)
open("/usr/lib/tls/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such
file or directory)
stat("/usr/lib/tls", 0x7fffd1634d10) = -1 ENOENT (No such file or
directory)
open("/usr/lib/x86_64/libc.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No
such file or directory)
stat("/usr/lib/x86_64", 0x7fffd1634d10) = -1 ENOENT (No such file or
directory)
open("/usr/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\1\2\0\0\0\0\0"..., 832)
= 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1984416, ...}) = 0
mmap(NULL, 3813200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7f71c0a18000
mprotect(0x7f71c0bb1000, 2097152, PROT_NONE) = 0
mmap(0x7f71c0db1000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x199000) = 0x7f71c0db1000
mmap(0x7f71c0db7000, 16208, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f71c0db7000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fda000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fd9000
arch_prctl(ARCH_SET_FS, 0x7f71c0fda700) = 0
mprotect(0x7f71c0db1000, 16384, PROT_READ) = 0
mprotect(0x7f71c0fdc000, 4096, PROT_READ) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 6), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fd8000
write(1, "Enter a file to copy\n", 21) = 21
write(1, "\n", 1) = 1
fstat(0, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 6), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fd7000
read(0, "/etc/passwd\n", 1024) = 12
write(1, "Enter the file to copy to\n", 26) = 26
write(1, "\n", 1) = 1
read(0, "/home/ruben/ssadsa.tmp\n", 1024) = 23
access("/etc/passwd", R_OK) = 0
brk(0) = 0x68b000
brk(0x6ac000) = 0x6ac000
open("/etc/passwd", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=1637, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=1637, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fd6000
read(3, "root:x:0:0:root:/root:/bin/bash\n"..., 4096) = 1637
open("/home/ruben/ssadsa.tmp", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 5
fstat(5, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x7f71c0fd5000
close(3) = 0
munmap(0x7f71c0fd6000, 4096) = 0
write(5, "root:x:0:0:root:/root:/bin/bash\n"..., 1637) = 1637
close(5) = 0
munmap(0x7f71c0fd5000, 4096) = 0
exit_group(1) = ?
+++ exited with 1 +++
--------------030300070906050409080202
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--------------030300070906050409080202
Content-Type: text/x-csrc;
name="mycp.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="mycp.c"
#include
#include
#include
#include
#include
char buf[500] = {0};
char buf2[500] = {0};
char * buf3;
int fd, ret;
size_t len;
const char * PASSWD = "/etc/passwd";
off_t tmpsize;
struct stat filetmp;
FILE * INPUT;
FILE * OUTPUT;
int main( int argc, char * argv[])
{
puts ("Enter a file to copy\n");
if ( ! fgets( buf, 500, stdin) )
return EXIT_FAILURE;
len = strlen(buf);
buf[len-1] = 0;
puts ("Enter the file to copy to\n");
if ( ! fgets( buf2, 500, stdin) )
return EXIT_FAILURE;
len = strlen(buf2);
buf2[len-1] = 0;
if( access( buf, F_OK|R_OK ) == 0 ) {
INPUT = fopen( buf, "r");
if (INPUT == NULL){
printf("Can't Open %s\n", buf);
exit(EXIT_FAILURE);
}
}else{
perror("access INPUT file stat");
exit (EXIT_FAILURE);
}
//File Opened for reading
fd = fileno(INPUT);
if (fstat(fd, &filetmp ) == -1){
perror("stat on reading file:");
exit(EXIT_FAILURE);
}
//FILE IS STATTED
tmpsize = filetmp.st_size;
if( (buf3 = (char *) malloc( sizeof(int) * tmpsize)) == NULL)
exit (EXIT_FAILURE);
ret = fread(buf3, tmpsize, 1, INPUT);
if( ret != 1){
fprintf(stderr, "Read not complete: Req ==> %d Rec ==> %zu \n", ret, tmpsize);
exit(EXIT_FAILURE);
}
OUTPUT = fopen(buf2, "w");
if(OUTPUT == NULL){
printf("Can't Open %s\n ", buf2);
exit(EXIT_FAILURE);
}
//File Open for Writing
ret = fwrite(buf3, tmpsize, 1, OUTPUT);
if(ret != 1){
perror("WRITE");
fprintf(stderr, "WRITE not complete: Req ==> %d Rec ==> %zu\n", ret, tmpsize);
exit(EXIT_FAILURE);
}
free(buf3);
fclose(INPUT);
fclose(OUTPUT);
return 1;
}
--------------030300070906050409080202--
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