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/*
* Copyright (c) 2022 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "cimple" project.
* For details, see https://github.com/egor-tensin/cimple.
* Distributed under the MIT License.
*/
#include "net.h"
#include "log.h"
#include <netdb.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define gai_log_errno(ec) log_err("getaddrinfo: %s\n", gai_strerror(ec))
int net_bind(const char *port)
{
struct addrinfo *result, *it = NULL;
struct addrinfo hints;
int socket_fd, ret = 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
ret = getaddrinfo(NULL, port, &hints, &result);
if (ret) {
gai_log_errno(ret);
return -1;
}
for (it = result; it; it = it->ai_next) {
socket_fd = socket(it->ai_family, it->ai_socktype | SOCK_CLOEXEC, it->ai_protocol);
if (socket_fd < 0) {
log_errno("socket");
continue;
}
static const int yes = 1;
static const int no = 0;
if (it->ai_family == AF_INET6) {
if (setsockopt(socket_fd, IPPROTO_IPV6, IPV6_V6ONLY, &no, sizeof(no)) < 0) {
log_errno("setsockopt");
goto close_socket;
}
}
if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
log_errno("setsockopt");
goto close_socket;
}
if (bind(socket_fd, it->ai_addr, it->ai_addrlen) < 0) {
log_errno("bind");
goto close_socket;
}
break;
close_socket:
log_errno_if(close(socket_fd), "close");
}
freeaddrinfo(result);
if (!it) {
log_err("Couldn't bind to port %s\n", port);
return -1;
}
ret = listen(socket_fd, 4096);
if (ret < 0) {
log_errno("listen");
goto fail;
}
return socket_fd;
fail:
log_errno_if(close(socket_fd), "close");
return ret;
}
int net_accept(int fd)
{
int ret = 0;
ret = accept4(fd, NULL, NULL, SOCK_CLOEXEC);
if (ret < 0) {
log_errno("accept");
return ret;
}
return ret;
}
int net_connect(const char *host, const char *port)
{
struct addrinfo *result, *it = NULL;
struct addrinfo hints;
int socket_fd, ret = 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
ret = getaddrinfo(host, port, &hints, &result);
if (ret) {
gai_log_errno(ret);
return -1;
}
for (it = result; it; it = it->ai_next) {
socket_fd = socket(it->ai_family, it->ai_socktype | SOCK_CLOEXEC, it->ai_protocol);
if (socket_fd < 0) {
log_errno("socket");
continue;
}
if (connect(socket_fd, it->ai_addr, it->ai_addrlen) < 0) {
log_errno("connect");
goto close_socket;
}
break;
close_socket:
log_errno_if(close(socket_fd), "close");
}
freeaddrinfo(result);
if (!it) {
log_err("Couldn't connect to host %s, port %s\n", host, port);
return -1;
}
return socket_fd;
}
static ssize_t net_send(int fd, const void *buf, size_t len)
{
static const int flags = MSG_NOSIGNAL;
ssize_t ret = send(fd, buf, len, flags);
if (ret < 0) {
log_errno("send");
return -1;
}
return ret;
}
int net_send_all(int fd, const void *buf, size_t len)
{
size_t sent_total = 0;
while (sent_total < len) {
ssize_t sent_now = net_send(fd, (const char *)buf + sent_total, len - sent_total);
if (sent_now < 0)
return -1;
sent_total += sent_now;
}
return 0;
}
int net_recv_all(int fd, void *buf, size_t len)
{
ssize_t read_total = 0;
while ((size_t)read_total < len) {
ssize_t read_now = read(fd, buf, len);
if (!read_now)
break;
if (read_now < 0) {
log_errno("read");
return -1;
}
read_total += read_now;
}
if ((size_t)read_total < len) {
log_err("Received only %zd bytes out of %zu\n", read_total, len);
return -1;
}
return 0;
}
int net_send_buf(int fd, const void *buf, uint32_t len)
{
int ret = 0;
len = htonl(len);
ret = net_send_all(fd, &len, sizeof(len));
if (ret < 0)
return ret;
len = ntohl(len);
ret = net_send_all(fd, buf, len);
if (ret < 0)
return ret;
return ret;
}
int net_recv_buf(int fd, void **buf, uint32_t *len)
{
int ret = 0;
ret = net_recv_all(fd, len, sizeof(*len));
if (ret < 0) {
log_err("Couldn't read buffer length\n");
goto fail;
}
*len = ntohl(*len);
*buf = malloc(*len);
if (!*buf) {
log_errno("malloc");
goto fail;
}
ret = net_recv_all(fd, *buf, *len);
if (ret < 0) {
log_err("Couldn't read buffer\n");
goto free_buf;
}
return 0;
free_buf:
free(*buf);
fail:
return -1;
}
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