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/* Random Instruction Sequences for Userspace */
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <getopt.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]
*/
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);
}
}
int master(int sock)
{
printf("master waiting for data\n");
unsigned char cmd;
recv_data_pkt(sock, &cmd, 1);
printf("Got cmd %c, sending resp 0\n", cmd);
send_response_byte(sock, 0);
printf("Exiting.\n");
return 0;
}
int apprentice(int sock)
{
printf("requesting stop\n");
int resp = send_data_pkt(sock, "S", 1);
printf("got response %d\n", resp);
return resp;
}
int ismaster;
int main(int argc, char **argv)
{
// some handy defaults to make testing easier
uint16_t port = 9191;
char *hostname = "localhost";
int sock;
// TODO clean this up later
for (;;)
{
static struct option longopts[] =
{
{ "master", no_argument, &ismaster, 1 },
{ "host", required_argument, 0, 'h' },
{ "port", required_argument, 0, 'p' },
{ 0,0,0,0 }
};
int optidx = 0;
int c = getopt_long(argc, argv, "h:p:", longopts, &optidx);
if (c == -1)
{
break;
}
switch (c)
{
case 0:
{
/* flag set by getopt_long, do nothing */
break;
}
case 'h':
{
hostname = optarg;
break;
}
case 'p':
{
// FIXME err handling
port = strtol(optarg, 0, 10);
break;
}
case '?':
{
/* error message printed by getopt_long */
exit(1);
}
default:
abort();
}
}
if (ismaster)
{
printf("master port %d\n", port);
sock = master_connect(port);
return master(sock);
}
else
{
printf("apprentice host %s port %d\n", hostname, port);
sock = apprentice_connect(hostname, port);
return apprentice(sock);
}
}
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