simple webserver (PoC)
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include "logging.h"
#include "sockaddr.h"
int tcp_listen(struct sockaddr_in *sa)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0 ) {
log_print(LOG_ERROR, "tcp_listen_socket(): socket()");
return -1;
}
int i = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i))) {
log_print(LOG_ERROR, "tcp_listen_socket(): setsockopt(SO_REUSEADDR)");
close(sock);
return -1;
}
if (bind(sock, (struct sockaddr *)sa, sizeof(*sa))) {
log_print(LOG_ERROR, "tcp_listen_socket(): bind(%s)", get_sockaddr_buf(sa));
close(sock);
return -1;
}
if (listen(sock, 8)) {
log_print(LOG_ERROR, "tcp_listen_socket(): listen()");
close(sock);
return -1;
}
return sock;
}
int tcp_connect(struct sockaddr_in *sa)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0 ) {
log_print(LOG_ERROR, "tcp_connect_socket(): socket()");
return -1;
}
int ret = connect(sock, (struct sockaddr *)sa, sizeof(*sa));
if (ret != 0) {
log_print(LOG_ERROR, "tcp_connect(): connect(%s)", get_sockaddr_buf(sa));
close(sock);
return -1;
}
return sock;
}
int tcp_connect_nonblock(struct sockaddr_in *sa)
{
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0 ) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): socket()");
return -1;
}
int flags = fcntl(sock, F_GETFL, 0);
if (flags < 0) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): fcntl(F_GETFL)");
close(sock);
return -1;
}
/* non-blocking connect() */
if (fcntl(sock, F_SETFL, flags | O_NONBLOCK)) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): fcntl(F_SETFL)");
close(sock);
return -1;
}
int ret = connect(sock, (struct sockaddr *)sa, sizeof(*sa));
if (ret && errno != EINPROGRESS) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): connect(%s)", get_sockaddr_buf(sa));
close(sock);
return -1;
}
/* reset EINPROGRESS */
errno = 0;
/* all further actions are blocking */
if (fcntl(sock, F_SETFL, flags)) {
log_print(LOG_ERROR, "tcp_connect_nonblock(): fcntl(F_SETFL)");
close(sock);
return -1;
}
return sock;
}
int tcp_connect_error(int fd)
{
int err;
unsigned int err_size = sizeof(err);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &err_size)) {
log_print(LOG_ERROR, "tcp_connect_error(): getsockopt(SO_ERROR)");
return -1;
}
if (err) {
errno = err;
log_print(LOG_ERROR, "tcp_connect_error()");
return -1;
}
return 0;
}