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#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <unistd.h>
#include <array.h>
#include <better_string.h>
#include <hash_table.h>
#include <helpers.h>
#include <opcodes.h>
#include <protocol.h>
int PORT = DEFAULT_PORT;
int nfds = 1;
struct pollfd fds[MAX_CONNECTIONS * 2];
ht_t *USERS;
ht_t *CHAN;
void handle_sigint(int sig) {
for (int i = 0; i < nfds; i++) {
if (fds[i].fd >= 0) {
close(fds[i].fd);
}
}
exit(0);
}
/* modifying function: modifies `in` to point to new location after opcode */
int parse_op(char *in) {
char buf[MAX_OP_LEN];
buf[0] = '\0';
char cur;
cur = in[0];
bool found = false;
for (int i = 0; i < 11; i++) {
if (cur == '\t') {
found = true;
in++;
break;
} else if (cur == '\0') {
break;
}
buf[i] = in[0];
in++;
cur = in[0];
}
return found ? encode_client_opcode(buf) : CO_UNRECOGNIZED;
}
array_t *parse_args(char *buf) { return NULL; }
void set_non_blocking(int sock) {
int flags = fcntl(sock, F_GETFL, 0);
int code = fcntl(sock, F_SETFL, flags | O_NONBLOCK);
die_lz(code, "fcntl()");
}
int main(int argc, char **argv) {
char buffer[MAX_BUFSIZE];
char res_buffer[MAX_BUFSIZE];
struct pollfd *local_fds1 = fds;
struct pollfd *local_fds2 = fds + MAX_CONNECTIONS;
struct pollfd *local_fds = local_fds1;
/* We start by initializing our net-related structs */
signal(SIGINT, handle_sigint);
int listen_sd = socket(AF_INET6, SOCK_STREAM, 0);
int optval = 1;
die_lz(listen_sd, "socket()");
int reuse = setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, (char *)&optval,
sizeof(optval));
die_lz(reuse, "setsockopt()");
int nonblock = ioctl(listen_sd, FIONBIO, (char *)&optval);
die_lz(nonblock, "ioctl()");
set_non_blocking(listen_sd);
/* Make new address */
struct sockaddr_in6 addr;
alloc_zero(&addr, sizeof(addr));
addr.sin6_family = AF_INET6;
memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
addr.sin6_port = htons(DEFAULT_PORT);
int sock_bind = bind(listen_sd, (struct sockaddr *)&addr, sizeof(addr));
die_lz(sock_bind, "bind()");
int sock_listen = listen(listen_sd, 32);
die_lz(sock_listen, "listen()");
/*
The first fd entry is the listening socket for new connections;
all the rest are sockets we read from and write to. Whenever a client
connects, we know from the listening socket.
*/
alloc_zero(fds, sizeof(fds));
fds[0].fd = listen_sd;
fds[0].events = POLLIN;
int timeout = 6000;
int sock_poll;
bool end_server = false;
/* mainloop */
do {
bool compress_array = false;
/*
if an fd loses connection, we want to remove all -1's from the fds array
*/
sock_poll = poll(local_fds, nfds, timeout);
die_lz(sock_poll, "poll()");
for (int i = 0; i < nfds; i++) {
if (local_fds[i].revents == 0)
continue;
if (local_fds[i].revents != POLLIN) {
end_server = true;
break;
}
if (local_fds[i].fd == listen_sd) {
printf("socket is readable\n");
int new_sd;
do {
new_sd = accept(listen_sd, NULL, NULL);
if (new_sd < 0 && errno != EWOULDBLOCK) {
perror("accept() failed");
end_server = true;
break;
}
local_fds[nfds].fd = new_sd;
local_fds[nfds].events = POLLIN;
nfds++;
} while (new_sd >= 0);
} else {
bool close_conn = false;
int fd_recv;
int fd_send;
fd_recv = recv(local_fds[i].fd, buffer, sizeof(buffer), 0);
if (fd_recv < 0 && errno != EWOULDBLOCK) {
perror("recv() failed");
close_conn = true;
} else if (fd_recv == 0) {
printf("Connection closed\n");
close_conn = true;
} else {
/* echo server -- replace this with buffer parsing */
/* TODO: reply to client based on user input */
fd_send = send(local_fds[i].fd, buffer, fd_recv, 0);
if (fd_send < 0) {
perror("send()");
close_conn = true;
}
}
if (close_conn) {
close(local_fds[i].fd);
local_fds[i].fd = 0;
compress_array = true;
}
}
}
if (compress_array) {
printf("switching...\n");
int cur_nfds = nfds;
nfds = 0;
for (int i = 0; i < cur_nfds; i++) {
if (local_fds[i].fd != 0) {
local_fds2[nfds] = local_fds[i];
nfds ++;
}
}
local_fds1 = local_fds2;
local_fds2 = local_fds;
local_fds = local_fds1;
alloc_zero(local_fds2, MAX_CONNECTIONS);
}
} while (!end_server);
for (int i = 0; i < nfds; i++) {
if (fds[i].fd >= 0) {
close(fds[i].fd);
}
}
return 0;
}
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