mirror of https://github.com/lukaszle/zed_net
Source import
This commit is contained in:
ZedZull
parent
1a12e7637b
commit
c04df3ff7c
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/////////////////////////////////////////////////////////////////////////////////////////
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//
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// This is a quick and dirty implementation of an echo client/server.
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// It isn't written to reflect best practices!
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//
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define ZED_NET_IMPLEMENTATION
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#include "zed_net.h"
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int run_server(unsigned short port) {
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zed_net_init();
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zed_net_udp_socket_t *socket = zed_net_udp_socket_open(port, 0);
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printf("Running echo server on port %d!\n", port);
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char buffer[256];
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while (strcmp(buffer, "done") != 0) {
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zed_net_address_t sender;
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int bytes_read = zed_net_udp_socket_receive(socket, &sender, &buffer, sizeof(buffer));
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if (bytes_read) {
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printf("Received %d bytes from %s:%d: %s\n", bytes_read, zed_net_host_to_str(sender.host), sender.port, buffer);
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printf("Echoing...\n");
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zed_net_udp_socket_send(socket, sender, buffer, sizeof(buffer));
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}
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}
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printf("Done!\n");
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zed_net_udp_socket_close(socket);
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zed_net_shutdown();
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return 0;
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}
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int run_client(const char *host, unsigned short port) {
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zed_net_init();
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zed_net_udp_socket_t *socket = zed_net_udp_socket_open(0, 0);
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zed_net_address_t address;
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if (zed_net_get_address(&address, host, port) != 0) {
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printf("Error: %s\n", zed_net_get_error());
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zed_net_udp_socket_close(socket);
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zed_net_shutdown();
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return -1;
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}
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printf("Running client! Type \"done\" to exit.\n");
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char buffer[256];
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while (strcmp(buffer, "done") != 0) {
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printf("Message: ");
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fgets(buffer, 256, stdin);
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buffer[strlen(buffer) - 1] = '\0';
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printf("Sending...\n");
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zed_net_udp_socket_send(socket, address, buffer, sizeof(buffer));
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zed_net_address_t sender;
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int bytes_read = zed_net_udp_socket_receive(socket, &sender, &buffer, sizeof(buffer));
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if (bytes_read) {
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printf("Received %d bytes from %s:%d: %s\n", bytes_read, zed_net_host_to_str(sender.host), sender.port, buffer);
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}
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}
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printf("Done!\n");
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zed_net_udp_socket_close(socket);
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zed_net_shutdown();
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return 0;
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}
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int main(int argc, char **argv) {
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if (argc == 3 && strcmp(argv[1], "-server") == 0) {
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return run_server((unsigned short) atoi(argv[2]));
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} else if (argc == 4 && strcmp(argv[1], "-client") == 0) {
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return run_client(argv[2], (unsigned short) atoi(argv[3]));
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}
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printf("Usage: echoz [-server [port] or -client [host] [port]\n");
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return 0;
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}
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@ -0,0 +1,307 @@
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/////////////////////////////////////////////////////////////////////////////////////////
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//
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// zed_net - v0.18 - public domain networking library
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// (inspired by the excellent stb libraries: https://github.com/nothings/stb)
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//
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// This library is intended primarily for use in games and provides a simple wrapper
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// around BSD sockets (Winsock 2.2 on Windows). Sockets can be set to be blocking or
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// non-blocking.
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//
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// Only UDP sockets are supported at this time, but this may later expand to include TCP.
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//
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// VERSION HISTORY
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//
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// 0.18 (9/13/2015) minor polishing
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// 0.17 (8/8/2015) initial release
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//
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// LICENSE
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//
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// This software is in the public domain. Where that dedication is not recognized, you
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// are granted a perpetual, irrevocable license to copy, distribute, and modify this
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// file as you see fit.
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//
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// USAGE
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//
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// #define the symbol ZED_NET_IMPLEMENTATION in *one* C/C++ file before the #include
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// of this file; the implementation will be generated in that file.
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//
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// If you define the symbol ZED_NET_STATIC, then the implementation will be private to
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// that file.
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//
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// Immediately after this block comment is the "header file" section. This section
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// includes documentation for each API function.
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//
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#ifndef INCLUDE_ZED_NET_H
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#define INCLUDE_ZED_NET_H
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#ifdef ZED_NET_STATIC
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#define ZED_NET_DEF static
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#else
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#define ZED_NET_DEF extern
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/////////////////////////////////////////////////////////////////////////////////////////
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//
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// INITIALIZATION AND SHUTDOWN
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//
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// Get a brief reason for failure
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ZED_NET_DEF const char *zed_net_get_error(void);
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// Perform platform-specific socket initialization;
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// *must* be called before using any other function
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//
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// Returns 0 on success, -1 otherwise (call 'zed_net_get_error' for more info)
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ZED_NET_DEF int zed_net_init(void);
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// Perform platform-specific socket de-initialization;
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// *must* be called when finished using the other functions
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ZED_NET_DEF void zed_net_shutdown(void);
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/////////////////////////////////////////////////////////////////////////////////////////
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//
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// INTERNET ADDRESS API
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//
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// Represents an internet address usable by sockets
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typedef struct {
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unsigned int host;
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unsigned short port;
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} zed_net_address_t;
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// Obtain an address from a host name and a port
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//
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// 'host' may contain a decimal formatted IP (such as "127.0.0.1"), a human readable
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// name (such as "localhost"), or NULL for the default address
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//
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// Returns 0 on success, -1 otherwise (call 'zed_net_get_error' for more info)
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ZED_NET_DEF int zed_net_get_address(zed_net_address_t *address, const char *host, unsigned short port);
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// Converts an address's host name into a decimal formatted string
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//
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// Returns NULL on failure (call 'zed_net_get_error' for more info)
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ZED_NET_DEF const char *zed_net_host_to_str(unsigned int host);
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/////////////////////////////////////////////////////////////////////////////////////////
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//
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// UDP SOCKETS API
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//
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// Wraps the system handle for a UDP socket
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typedef struct {
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int handle;
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} zed_net_udp_socket_t;
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// Opens a UDP socket and binds it to a specified port
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// (use 0 to select a random open port)
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//
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// Socket will not block if 'non-blocking' is non-zero
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//
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// Returns NULL on failure (call 'zed_net_get_error' for more info)
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ZED_NET_DEF zed_net_udp_socket_t *zed_net_udp_socket_open(unsigned int port, int non_blocking);
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// Closes a previously opened socket
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ZED_NET_DEF void zed_net_udp_socket_close(zed_net_udp_socket_t *socket);
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// Sends a specific amount of data to 'destination'
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//
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// Returns 0 on success, -1 otherwise (call 'zed_net_get_error' for more info)
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ZED_NET_DEF int zed_net_udp_socket_send(zed_net_udp_socket_t *socket, zed_net_address_t destination, const void *data, int size);
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// Receives a specific amount of data from 'sender'
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//
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// Returns the number of bytes received, -1 otherwise (call 'zed_net_get_error' for more info)
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ZED_NET_DEF int zed_net_udp_socket_receive(zed_net_udp_socket_t *socket, zed_net_address_t *sender, void *data, int size);
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#ifdef __cplusplus
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}
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#endif
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#endif // INCLUDE_ZED_NET_H
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#ifdef ZED_NET_IMPLEMENTATION
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#include <stdlib.h>
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#include <string.h>
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#ifdef _WIN32
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#include <WinSock2.h>
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#pragma comment(lib, "wsock32.lib")
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#else
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#include <sys/socket.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <fcntl.h>
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#endif
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static const char *zed_net__g_error;
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static int zed_net__error(const char *message) {
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zed_net__g_error = message;
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return -1;
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}
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ZED_NET_DEF const char *zed_net_get_error(void) {
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return zed_net__g_error;
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}
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ZED_NET_DEF int zed_net_init(void) {
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#ifdef _WIN32
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WSADATA wsa_data;
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if (WSAStartup(MAKEWORD(2, 2), &wsa_data) != 0)
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{
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return zed_net__error("Windows Sockets failed to start");
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}
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return 0;
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#else
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return 0;
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#endif
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}
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ZED_NET_DEF void zed_net_shutdown(void) {
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#ifdef _WIN32
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WSACleanup();
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#endif
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}
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ZED_NET_DEF int zed_net_get_address(zed_net_address_t *address, const char *host, unsigned short port) {
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if (host == NULL) {
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address->host = INADDR_ANY;
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} else {
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address->host = inet_addr(host);
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if (address->host == INADDR_NONE) {
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struct hostent *hostent = gethostbyname(host);
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if (hostent) {
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memcpy(&address->host, hostent->h_addr, hostent->h_length);
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} else {
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return zed_net__error("Invalid host name");
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}
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}
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}
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address->port = port;
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return 0;
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}
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ZED_NET_DEF const char *zed_net_host_to_str(unsigned int host) {
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struct in_addr in;
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in.s_addr = host;
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return inet_ntoa(in);
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}
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ZED_NET_DEF zed_net_udp_socket_t *zed_net_udp_socket_open(unsigned int port, int non_blocking) {
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zed_net_udp_socket_t *sock = malloc(sizeof(zed_net_udp_socket_t));
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if (!sock) {
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zed_net__error("Out of memory");
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return NULL;
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}
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// Create the socket
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sock->handle = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (sock->handle <= 0) {
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zed_net_udp_socket_close(sock);
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zed_net__error("Failed to create socket");
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return NULL;
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}
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// Bind the socket to the port
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struct sockaddr_in address;
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = INADDR_ANY;
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address.sin_port = htons(port);
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if (bind(sock->handle, (const struct sockaddr *) &address, sizeof(struct sockaddr_in)) != 0) {
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zed_net_udp_socket_close(sock);
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zed_net__error("Failed to bind socket");
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return NULL;
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}
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// Set the socket to non-blocking if neccessary
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if (non_blocking) {
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#ifdef _WIN32
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if (ioctlsocket(sock->handle, FIONBIO, &non_blocking) != 0) {
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zed_net_udp_socket_close(sock);
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zed_net__error("Failed to set socket to non-blocking");
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return NULL;
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}
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#else
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if (fcntl(sock->handle, F_SETFL, O_NONBLOCK, non_blocking) != 0) {
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zed_net_udp_socket_close(sock);
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zed_net__error("Failed to set socket to non-blocking");
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return NULL;
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}
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#endif
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}
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return sock;
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}
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ZED_NET_DEF void zed_net_udp_socket_close(zed_net_udp_socket_t *socket) {
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if (!socket) {
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return;
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}
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if (socket->handle) {
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#ifdef _WIN32
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closesocket(socket->handle);
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#else
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close(socket->handle);
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#endif
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}
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free(socket);
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}
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ZED_NET_DEF int zed_net_udp_socket_send(zed_net_udp_socket_t *socket, zed_net_address_t destination, const void *data, int size) {
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if (!socket) {
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return zed_net__error("Socket is NULL");
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}
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struct sockaddr_in address;
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = destination.host;
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address.sin_port = htons(destination.port);
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int sent_bytes = sendto(socket->handle, (const char *) data, size, 0, (const struct sockaddr *) &address, sizeof(struct sockaddr_in));
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if (sent_bytes != size) {
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return zed_net__error("Failed to send data");
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}
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return 0;
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}
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ZED_NET_DEF int zed_net_udp_socket_receive(zed_net_udp_socket_t *socket, zed_net_address_t *sender, void *data, int size) {
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if (!socket) {
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return zed_net__error("Socket is NULL");
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}
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#ifdef _WIN32
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typedef int socklen_t;
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#endif
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struct sockaddr_in from;
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socklen_t from_length = sizeof(from);
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int received_bytes = recvfrom(socket->handle, (char *) data, size, 0, (struct sockaddr *) &from, &from_length);
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if (received_bytes <= 0) {
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return 0;
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}
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sender->host = from.sin_addr.s_addr;
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sender->port = ntohs(from.sin_port);
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return received_bytes;
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}
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#endif // ZED_NET_IMPLEMENTATION
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