project skeleton

.gitignore

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+**/*.o
+asfur
+config.h

Makefile

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+# See LICENSE file for copyright and license details.
+
+include config.mk
+
+SRC = main.c\
+      password.c
+HDR = config.def.h client.h
+OBJ = ${SRC:.c=.o}
+
+all: options asfur
+
+options:
+	@echo asfur build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+
+.c.o:
+	${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.h client.h
+
+config.h:
+	cp config.def.h $@
+
+users.h:
+	cp users.def.h $@
+
+asfur: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	rm -f asfur ${OBJ} asfur-${VERSION}.tar.gz
+
+dist: clean
+	mkdir -p asfur-${VERSION}
+	cp -R LICENSE Makefile README config.mk\
+		asfur.1 ${HDR} ${SRC} asfur-${VERSION}
+	tar -cf asfur-${VERSION}.tar asfur-${VERSION}
+	gzip asfur-${VERSION}.tar
+	rm -rf asfur-${VERSION}
+
+install: all
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp -f asfur ${DESTDIR}${PREFIX}/bin
+	chmod 755 ${DESTDIR}${PREFIX}/bin/asfur
+	mkdir -p ${DESTDIR}${MANPREFIX}/man1
+	sed "s/VERSION/${VERSION}/g" < asfur.1 > ${DESTDIR}${MANPREFIX}/man1/asfur.1
+	chmod 644 ${DESTDIR}${MANPREFIX}/man1/asfur.1
+
+uninstall:
+	rm -f ${DESTDIR}${PREFIX}/bin/asfur\
+		${DESTDIR}${MANPREFIX}/man1/asfur.1
+
+.PHONY: all options clean dist install uninstall

client.h

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+#ifndef CLIENT_H
+#define CLIENT_H
+
+#include <uv.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+struct client {
+	uv_tcp_t handle;
+	uint32_t user_id;
+	uint32_t current_room_id;
+	bool is_authenticated;
+	char username[32];
+};
+
+#endif

config.def.h

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+/* See LICENSE file for copyright and license details. */
+
+#define CONFIG_ALLOW_REGISTER true
+

config.mk

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+# asfur version
+VERSION = 0.1
+
+# Customize below to fit your system
+
+# paths
+PREFIX = /usr
+MANPREFIX = ${PREFIX}/share/man
+
+# OpenBSD (uncomment)
+#MANPREFIX = ${PREFIX}/man
+
+# includes and libs
+INCS = -I.
+LIBS = -lssl -lcrypto -lcrypt -luv
+# flags
+CFLAGS  := -std=c11 -pedantic -Wall -O0 ${INCS} -DVERSION=\"${VERSION}\" 
+CFLAGS  := ${CFLAGS} -g
+LDFLAGS  = ${LIBS}
+
+# Solaris
+#CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"
+#LDFLAGS = ${LIBS}
+
+# compiler and linker
+CC = cc

main.c

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+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <uv.h>
+#include <pthread.h>
+#include "client.h"
+
+uv_loop_t *loop;
+
+void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf)
+{
+	(void)handle;
+	buf->base = (char*) malloc(suggested_size);
+	buf->len = suggested_size;
+}
+
+void echo_write(uv_write_t *req, int status)
+{
+	if (status) {
+		fprintf(stderr, "Write error %s\n", uv_strerror(status));
+	}
+	free(req);
+}
+
+void on_close(uv_handle_t *handle)
+{
+	free(handle);
+}
+
+void on_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf)
+{
+	if (nread > 0) {
+		uv_write_t *req = (uv_write_t *) malloc(sizeof(uv_write_t));
+		uv_buf_t wrbuf = uv_buf_init(buf->base, nread);
+		uv_write(req, client, &wrbuf, 1, echo_write);
+	}
+	if (nread < 0) {
+		if (nread != UV_EOF)
+			fprintf(stderr, "Read error %s\n", uv_err_name(nread));
+		uv_close((uv_handle_t*) client, on_close);
+	}
+	free(buf->base);
+}
+
+void on_new_connection(uv_stream_t *server, int status)
+{
+	if (status < 0) {
+		fprintf(stderr, "New connection error %s\n", uv_strerror(status));
+		return;
+	}
+
+	struct client *client = malloc(sizeof(struct client));
+	uv_tcp_init(loop, &client->handle);
+	if (uv_accept(server, (uv_stream_t*) &client->handle) == 0) {
+		uv_read_start((uv_stream_t*) &client->handle, alloc_buffer, on_read);
+	} else {
+		uv_close((uv_handle_t*) &client->handle, on_close);
+	}
+}
+
+int main()
+{
+	loop = uv_default_loop();
+
+	uv_tcp_t server;
+	uv_tcp_init(loop, &server);
+
+	struct sockaddr_in addr;
+	uv_ip4_addr("0.0.0.0", 7000, &addr);
+
+	uv_tcp_bind(&server, (const struct sockaddr*)&addr, 0);
+	int r = uv_listen((uv_stream_t*) &server, 128, on_new_connection);
+
+	if (r) {
+		fprintf(stderr, "Listen error %s\n", uv_strerror(r));
+		return 1;
+	}
+	return uv_run(loop, UV_RUN_DEFAULT);
+}

password.c

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+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <crypt.h>
+
+void generate_salt(char *salt_buffer)
+{
+	const char *charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./";
+	salt_buffer[0] = '$';
+	salt_buffer[1] = '6'; // SHA-512
+	salt_buffer[2] = '$';
+	
+	srand(time(NULL));
+	for (int i = 3; i < 19; i++) {
+		salt_buffer[i] = charset[rand() % 64];
+	}
+	salt_buffer[19] = '$';
+	salt_buffer[20] = '\0';
+}
+
+char* hash_password(const char *password)
+{
+	struct crypt_data data;
+	data.initialized = 0;
+	
+	char salt[21];
+	generate_salt(salt);
+	
+	char *hash = crypt_r(password, salt, &data);
+	return hash ? strdup(hash) : NULL;
+}
+
+int verify_password(const char *password, const char *stored_hash)
+{
+	struct crypt_data data;
+	data.initialized = 0;
+	
+	char *calculated = crypt_r(password, stored_hash, &data);
+	
+	return (calculated && strcmp(calculated, stored_hash) == 0);
+}

password.h

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+#ifndef PASSWORD_H
+#define PASSWORD_H
+
+void generate_salt(char *salt_buffer);
+/* Returns a malloc'd string containing the full hash (including salt) */
+char* hash_password(const char *password);
+/* Returns 1 if match, 0 if fail */
+int verify_password(const char *password, const char *stored_hash);
+
+#endif