Store file into a buffer to send it through a socket Post: 302347472

Sponsored Content

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

08-25-2009

Registered User

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.

semash!

View Public Profile for semash!

Find all posts by semash!

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

What is my UDP send/recieve buffer size

Hi, If some one was to suggest, "increase your kernal tunables related to UDP, in particular the UDP send/recieve buffer size".... then what would they mean? :confused: How can I find out what this current value is? Thousand many thanks. Neil

2. Shell Programming and Scripting

send function in socket

Hi All, I encountered a stange problem while doing a perl script to use socket. i need to transfer a file from client to sever. but error came as argument missing in send function.........Plz tell me the wt r the arguments in send and recv functions.......

3. Programming

UDP socket - can both client and server recv and send

Hi, Am very new to socket programming. When we use UDP sockets to communicate between two processess, will both the client/server socket be able to send/recv ? meaning can sendto()/ recvfrom() be used on both server and client? It could be useful even if anybody provide some link on socket...

4. UNIX for Advanced & Expert Users

connect problem for sctp socket (ipv6 socket) - Runtime fail Invalid Arguments

Hi, I was porting ipv4 application to ipv6; i was done with TCP transports. Now i am facing problem with SCTp transport at runtime. To test SCTP transport I am using following server and client socket programs. Server program runs fine, but client program fails giving Invalid Arguments for...

5. Programming

Send/Receive buffer size??

Dear friends, How do I find the TCP send and receive buffer size?

6. Programming

Socket Programming Send File

Hello my friends; Look at this 2 program: Client: #include <stdlib.h> #include <stdio.h> #include <string.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <arpa/inet.h> int main ( int agrc, char *argv ) { int Socket; struct sockaddr_in...

7. Programming

Finding used socket receive-buffer size

I have set the receive buffer size of socket to max. setsockopt(sd,SOL_SOCKET, SO_RCVBUF,&max,optval); Am reading data from the socket in a loop(say max 100 bytes per recv) while(1) { int rlen=recv(sd,(void *)buf, 100 , 0); //err handle and processing } Assume my process is slow...

8. Programming

how can I send and receive data in client server socket programing

char name; printf ("Welcome to the server \n"); printf ("Enter user name: \n"); scanf ("%c", &name); how can client send name to server:what should be the code? int send ( int sid , const char ∗buffer Ptr , int len , int f l a g ) how can client receive ack from...

9. AIX

Sample C program to Send/Recieve a file using Socket

Hi All, I urgently need a Sample C program to Send/Recieve a file using Socket. Thanks Sara

10. Programming

How to avoid 'No buffer space available' on C socket?

Hello everybody, Years ago i left in stand-by a project of mine where the main program was supposed to send thousands ARP frames over the socket as fast as it could; but because of a programming issue i couldn't continue it. 2 days ago I decided to solve that issue. The thing is, when the...

LEARN ABOUT MOJAVE

curl_easy_send

curl_easy_send(3)						  libcurl Manual						 curl_easy_send(3)

NAME

       curl_easy_send - sends raw data over an "easy" connection

SYNOPSIS

       #include <curl/easy.h>

       CURLcode curl_easy_send( CURL *curl, const void *buffer,  size_t buflen, size_t *n);

DESCRIPTION

       This function sends arbitrary data over the established connection. You may use it together with curl_easy_recv(3) to implement custom pro-
       tocols using libcurl. This functionality can be particularly useful if you use proxies and/or SSL encryption: libcurl  will  take  care	of
       proxy negotiation and connection set-up.

       buffer is a pointer to the data of length buflen that you want sent.  The variable n points to will receive the number of sent bytes.

       To  establish  the  connection,	set CURLOPT_CONNECT_ONLY(3) option before calling curl_easy_perform(3) or curl_multi_perform(3). Note that
       curl_easy_send(3) will not work on connections that were created without this option.

       The call will return CURLE_AGAIN if it's not possible to send data right now - the socket is used in  non-blocking  mode  internally.  When
       CURLE_AGAIN  is	returned,  use	your  operating  system  facilities like select(2) to wait until the socket is writable. The socket may be
       obtained using curl_easy_getinfo(3) with CURLINFO_ACTIVESOCKET(3).

       Furthermore if you wait on the socket and it tells you it's writable, curl_easy_send(3) may return CURLE_AGAIN if the only  data  that  was
       sent was for internal SSL processing, and no other data could be sent.

AVAILABILITY

       Added in 7.18.2.

RETURN VALUE

       On success, returns CURLE_OK and stores the number of bytes actually sent into *n. Note that this may very well be less than the amount you
       wanted to send.

       On failure, returns the appropriate error code.

       This function may return CURLE_AGAIN. In this case, use your operating system facilities to wait until the socket is writable, and retry.

       If there's no socket available to use from the previous transfer, this function returns CURLE_UNSUPPORTED_PROTOCOL.

EXAMPLE

       See sendrecv.c in docs/examples directory for usage example.

SEE ALSO

       curl_easy_setopt(3), curl_easy_perform(3), curl_easy_getinfo(3), curl_easy_recv(3)

libcurl 7.54.0							 December 18, 2016						 curl_easy_send(3)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

What is my UDP send/recieve buffer size

Discussion started by: nhatch

2. Shell Programming and Scripting

send function in socket

Discussion started by: trupti_rinku

3. Programming

UDP socket - can both client and server recv and send

Discussion started by: rvan

4. UNIX for Advanced & Expert Users

connect problem for sctp socket (ipv6 socket) - Runtime fail Invalid Arguments

Discussion started by: chandrutiptur