static Cmdret conf_syntax(List *args)
{
log_msg("CONFIG", "conf_syntax");
char *group = list_arg(args, 1, VAR_STRING);
List *words = list_arg(args, 2, VAR_LIST);
char *single = list_arg(args, 2, VAR_STRING);
if (!group && (!words || !single))
return NORET;
fn_group *grp = get_group(group);
if (!grp)
grp = set_group(group);
if (single) {
fn_syn syn = {
.key = strdup(single),
.group = grp,
};
set_syn(&syn);
return NORET;
}
log_msg("CONFIG", "# %d", utarray_len(words->items));
for (int i = 0; i < utarray_len(words->items); i++) {
fn_syn syn = {
.key = strdup(list_arg(words, i, VAR_STRING)),
.group = grp,
};
set_syn(&syn);
}
return NORET;
}
int main(int argc, char *argv[])
{
int sockfd;
int portno, n_char;
int slen;
struct sockaddr_in serv_addr;
struct hostent *server;
char *hostname, *filepath;
double p_loss, p_corrupt;
p_loss = 0.0;
p_corrupt = 0.0;
int expect_seq_num;
struct packet snd_pkt, rcv_pkt;
FILE* file;
if (argc < 4)
{
fprintf(stderr, "Usage: %s hostname port filepath [loss ratio] [corrupt ratio]\n", argv[0]);
exit(0);
}
switch (argc)
{
case 6:
p_corrupt = atof(argv[5]);
case 5:
p_loss = atof(argv[4]);
default:
filepath = argv[3];
portno = atoi(argv[2]);
hostname = argv[1];
break;
}
sockfd = socket(AF_INET, SOCK_DGRAM, 0); // Using UDP!
if (sockfd < 0)
{
error("Error opening socket");
}
server = gethostbyname(hostname);
if (server == NULL)
{
fprintf(stderr, "Error: no such host\n");
exit(0);
}
bzero((char *)&serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length);
serv_addr.sin_port = htons(portno);
// Create the initial packet
expect_seq_num = 1;
snd_pkt = make_packet();
set_syn(&snd_pkt);
snd_pkt.seq_num = 0;
set_data(&snd_pkt, filepath, strlen(filepath));
slen = sizeof(serv_addr);
char str[100] = "copy_";
char *dirc, *basec, *dname, *bname;
dirc = strdup(filepath);
basec = strdup(filepath);
dname = dirname(dirc);
bname = basename(basec);
file = fopen(strcat(str, bname), "wb");
// Send the initial packet
msg("Sending file request to sender...\n");
n_char = sendto(sockfd, &snd_pkt, sizeof(snd_pkt), 0, (struct sockaddr*)&serv_addr, slen);
if (n_char < 0)
{
error("Error sending packet");
}
// Go-Back-N FSM
while (1)
{
// Wait to receive a message
// if (rcv_pkt)
// {
// free(rcv_pkt);
// }
rcv_pkt = make_packet();
n_char = recvfrom(sockfd, &rcv_pkt, sizeof(rcv_pkt), 0, (struct sockaddr*)&serv_addr, (socklen_t*)&slen);
if (check_none(&rcv_pkt))
{
msg("No such file exists on the sender side\n");
fclose(file);
remove(str);
teardown(NULL, sockfd);
}
if (check_fin(&rcv_pkt)) // server closing connection
{
msg("-> FIN\n");
msg("<- FIN-ACK ...\n");
//free(&snd_pkt);
snd_pkt = make_packet();
set_fin(&snd_pkt);
n_char = sendto(sockfd, &snd_pkt, sizeof(snd_pkt), 0, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if (n_char < 0)
{
error("Error sending FIN-ACK");
}
//free(&rcv_pkt);
//free(&snd_pkt);
teardown(file, sockfd);
break;
}
if (n_char < 0)
{
msg("Packet from sender LOST\n");
}
else if (chance() < p_loss)
{
msg("Packet from sender LOST\n");
}
else if (chance() < p_corrupt)
{
msg("Packet from sender CORRUPT\n");
msg("<- RE-ACK: SEQNUM %d ...\n", snd_pkt.seq_num);
int n_char;
n_char = sendto(sockfd, &snd_pkt, sizeof(snd_pkt), 0, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if (n_char < 0)
{
error("Error acking packet\n");
}
}
else if (rcv_pkt.seq_num == expect_seq_num)
{
msg("-> DATA: SEQNUM %d\n", rcv_pkt.seq_num);
fwrite(rcv_pkt.data, 1, rcv_pkt.d_length, file);
expect_seq_num++;
//free(&snd_pkt);
snd_pkt = make_packet();
set_ack(&snd_pkt);
snd_pkt.seq_num = rcv_pkt.seq_num;
send_ack(sockfd, snd_pkt, serv_addr);
}
else if (rcv_pkt.seq_num < expect_seq_num)
{
msg("-> DATA: SEQNUM %d\n", rcv_pkt.seq_num);
//free(&snd_pkt);
snd_pkt = make_packet();
set_ack(&snd_pkt);
snd_pkt.seq_num = rcv_pkt.seq_num;
msg("<- RE-ACK: SEQNUM %d ...\n", snd_pkt.seq_num);
int n_char;
n_char = sendto(sockfd, &snd_pkt, sizeof(snd_pkt), 0, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if (n_char < 0)
{
error("Error acking packet\n");
}
}
else
{
msg("-> DATA: SEQNUM %d\n", rcv_pkt.seq_num);
msg("<- RE-ACK: SEQNUM %d ...\n", snd_pkt.seq_num);
int n_char;
n_char = sendto(sockfd, &snd_pkt, sizeof(snd_pkt), 0, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if (n_char < 0)
{
error("Error acking packet\n");
}
}
}
}
