Initial commit

.gitignore

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+xbot
+build
+

Makefile

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+CC=gcc
+CFLAGS=-c -lconfig -I./lib
+BINFLAGS=-lconfig
+SRC=./src
+OBJ=./build
+OBJECTS=$(OBJ)/*.o
+EXEC=xbot
+
+main:
+	@rm -rf build
+	@mkdir build
+	$(CC) $(CFLAGS) $(SRC)/main.c -o $(OBJ)/main.o
+	$(CC) $(CFLAGS) $(SRC)/irc.c -o $(OBJ)/irc.o
+	$(CC) $(CFLAGS) $(SRC)/util.c -o $(OBJ)/util.o
+	$(CC) -o $(EXEC) $(OBJECTS) $(BINFLAGS)
+	@echo "All Done!"
+
+clean:
+	@rm -rf build $(EXEC)

README.md

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+# xbot

lib/irc.h

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+/*
+ * xbot: Just another IRC bot
+ *
+ * Written by Aaron Blakely <aaron@ephasic.org>
+**/
+
+#ifndef IRC_H
+#define IRC_H
+
+#include <stdio.h>
+
+struct irc_conn
+{
+	FILE *srv_fd;
+
+	char nick[32];
+	char *host;
+	char *port;
+	char *real_name;
+
+	// I/O Buffers
+	char out[4096];
+	char in[4096];
+
+};
+
+void irc_connect(struct irc_conn *bot);
+void irc_auth(struct irc_conn *bot);
+void irc_raw(struct irc_conn *bot, char *fmt, ...);
+void irc_parse_raw(struct irc_conn *bot, char *raw);
+
+#endif

lib/util.h

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+/*
+ * xbot: Just another IRC bot
+ *
+ * Written by Aaron Blakely <aaron@ephasic.org>
+**/
+
+#ifndef UTIL_H
+#define UTIL_H
+
+void eprint(char *fmt, ...);
+void strlcpy(char *to, const char *from, int len);
+char *skip(char *s, char c);
+void trim(char *s);
+
+#endif

src/irc.c

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+/*
+ * irc.c: IRC connection and parser
+ * xbot: Just another IRC bot
+ *
+ * Written by Aaron Blakely <aaron@ephasic.org>
+**/
+
+#include "irc.h"
+#include "util.h"
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+void irc_connect(struct irc_conn *bot)
+{
+	int srv_fd;
+	struct addrinfo hints;
+	struct addrinfo *res, *r;
+
+	memset(&hints, 0, sizeof hints);
+	hints.ai_family		= AF_UNSPEC;
+	hints.ai_socktype	= SOCK_STREAM;
+
+	if (getaddrinfo(bot->host, bot->port, &hints, &res) != 0)
+	{
+		eprint("Error: Cannot resolve hostname '%s':", bot->host);
+	}
+
+	for (r = res; r; r->ai_next)
+	{
+		if ((srv_fd = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
+		{
+			continue;
+		}
+
+		if (connect(srv_fd, r->ai_addr, r->ai_addrlen) == 0)
+		{
+			break;
+		}
+
+		close(srv_fd);
+	}
+
+	freeaddrinfo(res);
+	if (!r)
+	{
+		eprint("Error: Cannot connect to host '%s'\n", bot->host);
+	}
+
+	bot->srv_fd = fdopen(srv_fd, "r+");
+}
+
+void irc_auth(struct irc_conn *bot)
+{
+	irc_raw(bot, "NICK %s", bot->nick);
+	irc_raw(bot, "USER %s localhost %s :xbot (v0.1) - developed by @Dark_Aaron", bot->nick, bot->host);
+	fflush(bot->srv_fd);
+}
+
+void irc_raw(struct irc_conn *bot, char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(bot->out, sizeof bot->out, fmt, ap);
+	va_end(ap);
+
+
+	fprintf(bot->srv_fd, "%s\r\n", bot->out);
+}
+
+void irc_parse_raw(struct irc_conn *bot, char *raw)
+{
+	char *user, *par, *text;
+	user = bot->host;
+
+	if (!raw || !*raw)
+	{
+		return;
+	}
+
+	if (raw[0] == ':')
+	{
+		user = raw + 1;
+		raw  = skip(user, ' ');
+
+		if (raw[0] == '\0')
+		{
+			return;
+		}
+
+		skip(user, '!');
+	}
+
+	skip(raw, '\r');
+	par  = skip(raw, ' ');
+	text = skip(par, ':');
+	trim(par);
+
+	if (!strcmp("PONG", raw))
+	{
+		return;
+	}
+
+	if (!strcmp("PRIVMSG", raw))
+	{
+		//handle_privmsg(user, par, text)
+		if (!strcmp("Dark_Aaron", user))
+		{
+			irc_raw(bot, "JOIN #bots");
+		}
+	}
+	else if (!strcmp("PING", raw))
+	{
+		irc_raw(bot, "PONG %s", text);
+	}
+	else
+	{
+		if (!strcmp("NICK", raw) && !strcmp(user, bot->nick))
+		{
+			strlcpy(bot->nick, text, sizeof bot->nick);
+		}
+	}
+}

src/main.c

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+/*
+ * xbot: Just another IRC bot
+ *
+ * Written by Aaron Blakely <aaron@ephasic.org>
+**/
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/select.h>
+#include <libconfig.h>
+#include "irc.h"
+
+
+int main()
+{
+	fd_set rd;
+	config_t cfg, *cf;
+	const config_setting_t *retries;
+	const char *base = NULL;
+	struct irc_conn bot;
+
+	// Init the config parser
+	cf = &cfg;
+	config_init(cf);
+
+	if (!config_read_file(cf, "xbot.cfg"))
+	{
+		printf("xbot.cfg:%d - %s\n",
+			config_error_line(cf),
+			config_error_text(cf));
+
+		config_destroy(cf);
+		return -1;
+	}
+
+	// Fill our bot struct with values from the config
+	if (config_lookup_string(cf, "bot.nick", &base))
+		strlcpy(bot.nick, base, sizeof bot.nick);
+
+	if (config_lookup_string(cf, "server.host", &base))
+		bot.host = (char *)base;
+
+	if (config_lookup_string(cf, "server.port", &base))
+		bot.port = (char *)base;
+
+	// Connect to the server
+	printf("Connecting to %s...\n", bot.host);
+	irc_connect(&bot);
+	irc_auth(&bot);
+
+	// Free the config before entering the main loop
+	config_destroy(cf);
+
+	for (;;)
+	{
+		FD_ZERO(&rd);
+		FD_SET(fileno(bot.srv_fd), &rd);
+
+		if (FD_ISSET(fileno(bot.srv_fd), &rd))
+		{
+			if (fgets(bot.in, sizeof bot.in, bot.srv_fd) == NULL)
+			{
+				eprint("xbot: remote host closed connection\n");
+			}
+
+			irc_parse_raw(&bot, bot.in);
+		}
+	}
+
+	return 0;
+}

src/util.c

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+/*
+ * xbot: Just another IRC bot
+ *
+ * Written by Aaron Blakely <aaron@ephasic.org>
+**/
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdlib.h>
+
+void eprint(char *fmt, ...)
+{
+	char bufout[4096];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(bufout, sizeof bufout, fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "%s", bufout);
+	if (fmt[0] && fmt[strlen(fmt) - 1] == ':')
+	{
+		fprintf(stderr, "%s\n", strerror(errno));
+	}
+
+	exit(1);
+}
+
+void strlcpy(char *to, const char *from, int len)
+{
+	memccpy(to, from, '\0', len);
+	to[len-1] = '\0';
+}
+
+char *skip(char *s, char c)
+{
+	while (*s != c && *s != '\0')
+	{
+		s++;
+	}
+
+	if (*s != '\0')
+	{
+		*s++ = '\0';
+	}
+
+	return s;
+}
+
+void trim(char *s)
+{
+	char *e;
+
+	e = s + strlen(s) - 1;
+	while (isspace(*e) && e > s)
+	{
+		e--;
+	}
+
+	*(e + 1) = '\0';
+}

xbot.cfg

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+# xbot configuration file
+
+bot:
+{
+	nick = "xbot";
+	user = "xbot";
+};
+
+server:
+{
+	host = "irc.alphachat.net";
+	port = "6667";
+};