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server.c
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server.c
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#include <arpa/inet.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <sys/epoll.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <err.h>
#include "io.h"
#include "log.h"
#include "utils.h"
#include "utlist.h"
#include "handler.h"
#include "config.h"
#define EPOLL_WAIT_TIMEOUT 1000 /* in milliseconds */
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
# define UNUSED __attribute__((__unused__))
#else
# define UNUSED
#endif
#define CLOSE_CONN(connections, conn) \
do { \
close((conn)->fd); \
cleanup_steps((conn)->steps); \
DL_DELETE(connections, conn); \
free(conn); \
} while (0)
/* command line parameters */
static int conf_port = DEFAULT_CONF_PORT;
static int conf_quiet = DEFAULT_CONF_QUIET;
static int conf_chroot = DEFAULT_CONF_CHROOT;
static char *conf_listen_addr = DEFAULT_CONF_LISTEN_ADDR;
static char *conf_hostname = DEFAULT_CONF_HOSTNAME;
static char *conf_root_dir = DEFAULT_CONF_ROOT_DIR;
static volatile int loop = 1;
static void
accept_peers_loop(struct connection **connections,
int listenfd, int epollfd, time_t now)
{
int peerfd, opt;
struct connection *conn;
struct sockaddr_in conn_addr;
struct epoll_event peer_event = {0};
socklen_t conn_addr_len = sizeof(conn_addr);
for (;;) {
peerfd = accept4(listenfd,
(struct sockaddr *)&conn_addr, &conn_addr_len,
SOCK_NONBLOCK);
if (peerfd < 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
warn("accept4()");
}
break;
} else {
opt = 1;
if (setsockopt(peerfd, SOL_TCP, TCP_NODELAY, &opt, sizeof(opt))) {
warn("setsockopt(), SOL_TCP, TCP_NODELAY");
}
conn = xmalloc(sizeof(struct connection));
memset(conn->ip, 0, sizeof(conn->ip));
strcpy(conn->ip, inet_ntoa(conn_addr.sin_addr));
conn->fd = peerfd;
conn->last_active = now;
conn->status = C_RUN;
conn->steps = NULL;
conn->next = NULL;
conn->prev = NULL;
setup_read_io_step(&conn->steps, build_response);
DL_APPEND(*connections, conn);
peer_event.data.ptr = conn;
peer_event.events = EPOLLIN | EPOLLOUT | EPOLLRDHUP | EPOLLET;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, peerfd, &peer_event) < 0) {
warn("epoll_ctl()");
CLOSE_CONN(*connections, conn);
}
}
}
}
static void
run_server()
{
int i, epollfd, listenfd;
time_t now;
struct epoll_event ev = {0};
struct epoll_event events[MAXFDS] = {0};
struct connection *tmp_conn, *conn, *connections = NULL;
listenfd = create_listen_socket(conf_listen_addr, conf_port);
if ((epollfd = epoll_create1(0)) < 0) {
err(1, "epoll_create1()");
}
ev.data.ptr = &listenfd;
ev.events = EPOLLIN | EPOLLET;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, listenfd, &ev) < 0) {
err(1, "epoll_ctl()");
}
while (loop) {
now = time(NULL);
DL_FOREACH_SAFE(connections, conn, tmp_conn) {
if (conn->status == C_CLOSE) {
CLOSE_CONN(connections, conn);
}
}
i = epoll_wait(epollfd, events, MAXFDS, EPOLL_WAIT_TIMEOUT);
if (i < 0) {
warn("epoll_wait()");
continue;
}
while (i) {
ev = events[--i];
conn = ev.data.ptr;
/* In this case conn does not reference to connection's struct,
* but references to address of listenfd variable. It works because
* connection's struct first element is fd, so dereferencing gives
* in both cases fd variable
*/
if (conn->fd == listenfd) {
accept_peers_loop(&connections, listenfd, epollfd, now);
} else if (
ev.events & EPOLLHUP ||
ev.events & EPOLLERR ||
ev.events & EPOLLRDHUP)
{
CLOSE_CONN(connections, conn);
} else {
process_connection(conn);
conn->last_active = now;
}
}
}
DL_FOREACH_SAFE(connections, conn, tmp_conn) {
CLOSE_CONN(connections, conn);
}
close(listenfd);
close(epollfd);
}
static void
sigint_handler(int dummy UNUSED)
{
loop = 0;
}
static void
usage(const char *argv0)
{
printf("usage: %s path "
"[--addr addr] "
"[--port port] "
"[--hostname hostname] "
"[--chroot] "
"[--quiet]\n", argv0);
}
static void
parse_args(int argc, char *argv[])
{
int i;
size_t len;
char *next = NULL;
if (argc < 2 || (argc == 2 && !strcmp(argv[1], "--help"))) {
usage(argv[0]);
exit(0);
}
if (getuid() == 0) {
conf_port = 70;
}
conf_root_dir = argv[1];
/* Strip ending slash */
len = strlen(conf_root_dir);
if (len > 1) {
if (conf_root_dir[len - 1] == '/') {
conf_root_dir[len - 1] = '\0';
}
}
for (i = 2; i < argc; i++) {
if (!strcmp(argv[i], "--port")) {
if (++i >= argc) {
errx(1, "missing number after --port");
}
conf_port = strtol(argv[i], &next, 10);
if (next == argv[i] || *next != '\0') {
errx(1, "invalid argument `%s'", argv[i]);
}
}
else if (!strcmp(argv[i], "--addr")) {
if (++i >= argc) {
errx(1, "missing ip after --addr");
}
conf_listen_addr = argv[i];
}
else if (!strcmp(argv[i], "--hostname")) {
if (++i >= argc) {
errx(1, "missing hostname after --hostname");
}
conf_hostname = argv[i];
}
else if (!strcmp(argv[i], "--quiet")) {
conf_quiet = 1;
}
else if (!strcmp(argv[i], "--chroot")) {
conf_chroot = 1;
}
else {
errx(1, "unknown argument `%s'", argv[i]);
}
}
}
int
main(int argc, char *argv[])
{
signal(SIGPIPE, SIG_IGN);
signal(SIGINT, sigint_handler);
parse_args(argc, argv);
init_logger(conf_quiet);
init_handler(conf_root_dir, conf_hostname, conf_port, conf_chroot);
printf("listening on gopher://%s:%d/\n", conf_listen_addr, conf_port);
run_server();
return 0;
}