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/* Random Instruction Sequences for Userspace
* Copyright 2010 Linaro Limited
*
* Routines for the socket communication between master and apprentice.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include "risu.h"
int apprentice_connect(const char *hostname, uint16_t port)
{
/* We are the client end of the TCP connection */
int sock;
struct sockaddr_in sa;
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
perror("socket");
exit(1);
}
struct hostent *hostinfo;
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
hostinfo = gethostbyname(hostname);
if (!hostinfo)
{
fprintf(stderr, "Unknown host %s\n", hostname);
exit(1);
}
sa.sin_addr = *(struct in_addr*)hostinfo->h_addr;
if (connect(sock, (struct sockaddr*)&sa, sizeof(sa)) < 0)
{
perror("connect");
exit(1);
}
return sock;
}
int master_connect(uint16_t port)
{
int sock;
struct sockaddr_in sa;
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
perror("socket");
exit(1);
}
int sora = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &sora, sizeof(sora)) != 0)
{
perror("setsockopt(SO_REUSEADDR)");
exit(1);
}
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
sa.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(sock, (struct sockaddr*)&sa, sizeof(sa)) < 0)
{
perror("bind");
exit(1);
}
if (listen(sock, 1) < 0)
{
perror("listen");
exit(1);
}
/* Just block until we get a connection */
fprintf(stderr, "master: waiting for connection on port %d...\n", port);
struct sockaddr_in csa;
size_t csasz;
int nsock = accept(sock, (struct sockaddr*)&csa, &csasz);
if (nsock < 0)
{
perror("accept");
exit(1);
}
/* We're done with the server socket now */
close(sock);
return nsock;
}
/* The communication protocol is very simple.
* The apprentice sends a packet like this:
* 4 bytes: faulting insn
* n bytes: register dump
* The master replies with a single byte response:
* 0: ok, continue [registers matched]
* 1: exit with status 0 [end of test]
* 2: exit with status 1 [mismatch, fail]
*
* We can handle the variable-length packet at setup
* (where the apprentice sends command line options,
* random seed etc) by first sending the length alone
* as a 4-byte packet, and then a packet of that length.
*/
int send_data_pkt(int sock, void *pkt, int pktlen)
{
unsigned char resp;
char *p = pkt;
while (pktlen)
{
int i = write(sock, p, pktlen);
if (i <= 0)
{
perror("write failed");
exit(1);
}
pktlen -= i;
p += i;
}
if (read(sock, &resp, 1) != 1)
{
perror("read failed");
exit(1);
}
return resp;
}
void recv_data_pkt(int sock, void *pkt, int pktlen)
{
/* We always read a fixed length packet */
char *p = pkt;
while (pktlen)
{
int i = read(sock, p, pktlen);
if (i <= 0)
{
perror("read failed");
exit(1);
}
pktlen -= i;
p += i;
}
}
void send_response_byte(int sock, int resp)
{
unsigned char r = resp;
if (write(sock, &r, 1) != 1)
{
perror("write failed");
exit(1);
}
}
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