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Full Discussion: Store file into a buffer to send it through a socket
Top Forums Programming Store file into a buffer to send it through a socket Post 302347472 by semash! on Tuesday 25th of August 2009 07:43:46 PM
Old 08-25-2009
Hey achenle, thanks for the reply,
I did the code as following:

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <sys/stat.h>

int main(int argc, char *argv[])
{
if(argc !=3){
printf("Usage: %s <iface> <raw filename>\n", argv[0]);
exit(1);
}

int sfd,ffd;
ssize_t bytes;
unsigned char *buffer;
struct stat sizb;
struct sockaddr from;
from.sa_family = 1;
strcpy(from.sa_data, argv[1]);

if((stat(argv[2],&sizb))!=0){
perror("stat() failed: ");
exit(1);
}

buffer=(unsigned char *)malloc(sizb.st_size);
if((ffd=open(argv[2], O_RDONLY))<0){
perror("open() failed: ");
exit(1);
}

if((bytes = read(ffd, buffer, sizb.st_size))<= 0){
perror("read() failed: ");
close(ffd);
exit(1);
} else {
close(ffd);
}

if((sfd=socket(AF_INET,SOCK_PACKET,ntohs(ETH_P_ALL)))<0){
perror("socket() failed: ");
exit(1);
}

if((sendto(sfd, buffer, sizb.st_size,0,(struct sockaddr *)&from,sizeof(from)))<0){
perror("send() failed: ");
exit(1);
}

printf("%i bytes transmitted.\n", sizb.st_size);
close(sfd);
return 0;
}

If you create a file with a hex editor, it will successfully transmit to the medium the frame Smilie.

I'll test your way, thank you.
 

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LEARN ABOUT MOJAVE

shutdown

SHUTDOWN(2)						      BSD System Calls Manual						       SHUTDOWN(2)

NAME

     shutdown -- shut down part of a full-duplex connection

SYNOPSIS

     #include <sys/socket.h>

     int
     shutdown(int socket, int how);

DESCRIPTION

     The shutdown() call causes all or part of a full-duplex connection on the socket associated with socket to be shut down.  If how is SHUT_RD,
     further receives will be disallowed.  If how is SHUT_WR, further sends will be disallowed.  If how is SHUT_RDWR, further sends and receives
     will be disallowed.

RETURN VALUES

     The shutdown() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

ERRORS

     The call succeeds unless:

     [EBADF]		Socket is not a valid descriptor.

     [EINVAL]		The how argument is invalid.

     [ENOTCONN] 	The specified socket is not connected.

     [ENOTSOCK] 	Socket is a file, not a socket.

SEE ALSO

     connect(2), connectx(2), disconnectx(2), socket(2)

HISTORY

     The shutdown() function call appeared in 4.2BSD.

4.2 Berkeley Distribution					  March 18, 2015					 4.2 Berkeley Distribution
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