c_simple_http/src/tcp_socket.c

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// ISC License
//
// Copyright (c) 2024 Stephen Seo
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#include "tcp_socket.h"
// Standard library includes.
#include <stdio.h>
#include <string.h>
// Unix includes.
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <unistd.h>
// Local includes.
#include "big_endian.h"
int create_tcp_socket(uint16_t port) {
struct sockaddr_in6 ipv6_addr;
memset(&ipv6_addr, 0, sizeof(struct sockaddr_in6));
ipv6_addr.sin6_family = AF_INET6;
ipv6_addr.sin6_port = u16_be_swap(port);
ipv6_addr.sin6_addr = in6addr_any;
int tcp_socket = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 6);
if (tcp_socket == -1) {
switch (errno) {
case EACCES:
puts("ERROR: Socket creation: EACCES");
break;
case EAFNOSUPPORT:
puts("ERROR: Socket creation: EAFNOSUPPORT");
break;
case EINVAL:
puts("ERROR: Socket creation: EINVAL");
break;
case EMFILE:
puts("ERROR: Socket creation: EMFILE");
break;
case ENOBUFS:
puts("ERROR: Socket creation: ENOBUFS");
break;
case ENOMEM:
puts("ERROR: Socket creation: ENOMEM");
break;
case EPROTONOSUPPORT:
puts("ERROR: Socket creation: EPROTONOSUPPORT");
break;
default:
puts("ERROR: Socket creation: Unknown Error");
break;
}
return -1;
}
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int ret = bind(tcp_socket,
(const struct sockaddr *)&ipv6_addr,
sizeof(struct sockaddr_in6));
if (ret != 0) {
close(tcp_socket);
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puts("ERROR: Failed to bind socket! (Maybe just attempted to reuse socket "
"that didn't get \"cleaned up\" yet? Use different port?)");
return -1;
}
ret = listen(tcp_socket, C_SIMPLE_HTTP_TCP_SOCKET_BACKLOG);
if (ret == 0) {
return tcp_socket;
} else {
switch (errno) {
case EADDRINUSE:
puts("ERROR: Socket listen: EADDRINUSE");
break;
case EBADF:
puts("ERROR: Socket listen: EBADF");
break;
case ENOTSOCK:
puts("ERROR: Socket listen: ENOTSOCK");
break;
default:
puts("ERROR: Socket listen: Unknown Error");
break;
}
return -1;
}
}
void cleanup_tcp_socket(int *tcp_socket) {
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if (tcp_socket && *tcp_socket >= 0) {
close(*tcp_socket);
*tcp_socket = -1;
}
}
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// vim: et ts=2 sts=2 sw=2