simple-sync-posix-hexdumper.c

#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

unsigned int get_all_buf(int sock, char* output, unsigned int maxsize)
{
	char buffer[1024];

	int n;
	unsigned int offset = 0;
	while((errno = 0, (n = recv(sock, buffer, sizeof(buffer), 0))>0) ||
		errno == EINTR)
	{
		if(n>0)
		{
			if (((unsigned int) n)+offset > maxsize) { fprintf(stderr, "too much data!"); exit(EXIT_FAILURE); }
			memcpy(output+offset, buffer, n);
			offset += n;
		}
	}

	if(n < 0)
	{
		fprintf(stderr, "error in get_all_buf!");
		exit(EXIT_FAILURE);
	}
	return offset;
}


int main(void)
{
	struct sockaddr_in stSockAddr;
	int Res;
	int SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

	if (-1 == SocketFD)
	{
		perror("cannot create socket");
		exit(EXIT_FAILURE);
	}

	memset(&stSockAddr, 0, sizeof(stSockAddr));

	stSockAddr.sin_family = AF_INET;
	stSockAddr.sin_port = htons(1100);
	Res = inet_pton(AF_INET, "127.0.0.1", &stSockAddr.sin_addr);

	if (0 > Res)
	{
		perror("error: first parameter is not a valid address family");
		close(SocketFD);
		exit(EXIT_FAILURE);
	}
	else if (0 == Res)
	{
		perror("char string (second parameter does not contain valid ipaddress)");
		close(SocketFD);
		exit(EXIT_FAILURE);
	}

	if (-1 == connect(SocketFD, (struct sockaddr *)&stSockAddr, sizeof(stSockAddr)))
	{
		perror("connect failed");
		close(SocketFD);
		exit(EXIT_FAILURE);

	}

	/* perform read write operations ... */
	char out[1024*1024];
	memset(out, 0, sizeof(out)-1);
	unsigned int len = get_all_buf(SocketFD, out, sizeof(out)-1);
	printf("%d\n", len);
	//out[len] = '\0';
	//puts(out);
	int i;
	for (i=0; i<len; i++) printf("%x\n", out[i]);

	shutdown(SocketFD, SHUT_RDWR);

	close(SocketFD);
	return EXIT_SUCCESS;
}