initial commit

4 files changed, 501 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a6c516a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+
+CFLAGS ?= -g
+
+all: sircbot
+
+sircbot_OBJ = sircbot.o irc.o
+
+sircbot: $(sircbot_OBJ)
+	$(CC) $(LDFLAGS) -o $@ $^
+
+.c.o:
+	$(CC) $(CFLAGS) -c $^
+
+
diff --git a/irc.c b/irc.c
new file mode 100644
index 0000000..92a925e
--- /dev/null
+++ b/irc.c
@@ -0,0 +1,85 @@
+
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "irc.h"
+
+static int tcp_connect(const char *host, int port)
+{
+	struct sockaddr_in addr;
+	struct hostent *h;
+	int sock = socket(AF_INET, SOCK_STREAM, 0);
+	if (sock < 0) 
+		return sock;
+
+	h = gethostbyname(host);
+	if (h == NULL) 
+		return -1;
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+        addr.sin_port = htons(port);
+	memcpy(&addr.sin_addr, h->h_addr, h->h_length);
+        if (connect(sock, (struct sockaddr *) &addr, 
+	    sizeof(struct sockaddr_in))) {
+		close(sock);
+		sock = -1;
+	}
+	return sock;
+}
+
+struct irc_session *irc_connect(const char* server, int port, const char *nick,
+				const char *pass)
+{
+	char buf[256];
+	struct irc_session *sess;
+	
+	sess = malloc(sizeof(struct irc_session));
+	if (sess == NULL)
+		return NULL;
+		
+	sess->nick = nick;
+	sess->server = server;
+	sess->fd = tcp_connect(server, port);
+	if (sess->fd < 0) 
+		return NULL;
+		
+	/* login */
+	if (pass)
+		irc_send(sess, "PASS", pass);
+	irc_send(sess, "NICK", nick);
+	snprintf(buf, sizeof(buf), "%s localhost %s :%s", nick, server, nick);
+	irc_send(sess, "USER", buf);
+	return sess;
+}
+
+int irc_send(struct irc_session *s, const char *command, const char *args)
+{
+	char buf[4096];
+	snprintf(buf, sizeof(buf), "%s %s\r\n", command, args);
+	return write(s->fd, buf, strlen(buf));
+}
+
+int irc_send_chan(struct irc_session *s, const char *chan, const char *msg)
+{
+	char buf[4096];
+	snprintf(buf, sizeof(buf), "%s :%s", chan, msg);
+	return irc_send(s, "PRIVMSG", buf);
+}
+
+int irc_send_ping(struct irc_session *s)
+{
+	return irc_send(s, "PING", s->server);
+}
+
+int irc_close(struct irc_session *s, const char *msg)
+{
+	irc_send(s, "QUIT", msg ? msg : "");
+	close(s->fd);
+	free(s);
+}
diff --git a/irc.h b/irc.h
new file mode 100644
index 0000000..e5dd2c8
--- /dev/null
+++ b/irc.h
@@ -0,0 +1,24 @@
+/* 
+ * Copyright (c) Natanael Copa 2009, 2010 
+ * GPL-2
+ *
+ */
+
+#ifndef IRC_H
+#define IRC_H
+
+struct irc_session {
+	int fd;
+	const char *server;
+	const char *nick;
+	int last_pong;
+};
+
+struct irc_session *irc_connect(const char* server, int port, const char *nick,
+				const char *pass);
+int irc_send(struct irc_session *s, const char *command, const char *args);
+int irc_send_chan(struct irc_session *s, const char *chan, const char *msg);
+int irc_send_ping(struct irc_session *s);
+int irc_close(struct irc_session *s, const char *msg);
+
+#endif /* IRC_H */
diff --git a/sircbot.c b/sircbot.c
new file mode 100644
index 0000000..f2d9d76
--- /dev/null
+++ b/sircbot.c
@@ -0,0 +1,378 @@
+/* Small daemon that connects to IRC server and joins given channel
+and sends whatever is written to the FIFO
+
+Intended usage is git hook that sends commits, etc.
+*/
+
+#define _GNU_SOURCE
+
+#include <sys/poll.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+
+#include "irc.h"
+
+#define PROGNAME "sircbot"
+
+#if !defined(DEFAULT_PIDFILE)
+#define DEFAULT_PIDFILE	"/var/run/" PROGNAME "/" PROGNAME ".pid"
+#endif
+
+struct sircbot_channel {
+	char *name;
+	char *fifo;
+	int fd;
+};
+
+static int foreground = 0;
+static int sigterm = 0;
+
+
+static int write_pid(const char *file)
+{
+	int fd, n;
+	char tmp[16];
+	fd = open(file, O_CREAT | O_WRONLY, 0660);
+	if (fd < 0) {
+		perror(file);
+		return -1;
+	}
+	n = snprintf(tmp, sizeof(tmp), "%d\n", getpid());
+	if (write(fd, tmp, n) == n)
+		n = 0;
+	close(fd);
+	return n;
+}
+
+int daemonize(const char *pidfile)
+{
+	int devnull, f;
+	int pid = fork();
+	if (pid < 0) {
+		perror("fork");
+		return -1;
+	}
+	/* exit parent */
+	if (pid > 0)
+		exit(0);
+	
+	/* detatch to controling terminal */
+	setsid();
+
+	pid = fork();
+	if (pid < 0) {
+		perror("fork");
+		return -1;
+	}
+	/* exit parent */
+	if (pid > 0)
+		exit(0);
+
+	if (write_pid(pidfile) < 0)
+		return -1;
+		/* redirect stdin/stdout/stderr to /dev/null */
+        freopen("/dev/null", "r", stdin);
+        freopen("/dev/null", "w", stdout);
+	freopen("/dev/null", "w", stderr);
+	return 0;
+}
+
+static void log_err(const char *msg)
+{
+	syslog(LOG_ERR, "%s: %s", msg, strerror(errno));
+}
+
+int init_fifo(struct sircbot_channel *chan)
+{
+	unlink(chan->fifo);
+	if (mkfifo(chan->fifo, 0666) < 0)
+		return -1;
+	chan->fd = open(chan->fifo, O_RDONLY | O_NONBLOCK);
+	if (chan->fd < 0)
+		return -1;
+	return 0;
+}
+
+int find_channel(struct sircbot_channel *chan, int numchan, char *name)
+{
+	int i;
+	for (i = 0; i < numchan; i++) {
+		if (strcmp(chan[i].name, name) == 0)
+			return init_fifo(&chan[i]);
+	}
+	return 0;
+}
+
+int run_hooks(char *user, char *rcpt, char* data)
+{
+	int pid = fork();
+	int status;
+	char dir[PATH_MAX];
+	if (pid < 0) {
+		log_err("fork");
+		return -1;
+	}
+	if (pid == 0) {
+		/* detatch to controling terminal */
+		setsid();
+
+		pid = fork();
+		if (pid < 0) {
+			perror("fork");
+			exit(1);
+		}
+		/* exit parent */
+		if (pid > 0)
+			exit(0);
+		
+		snprintf(dir, sizeof(dir), "/etc/" PROGNAME ".d/%s", rcpt);
+		printf("DEBUG: running scripts in %s\n", dir);
+		execlp("/bin/run-parts", "/bin/run-parts", "-a", user, 
+			   "-a", data, "-a", rcpt, dir, NULL);
+		log_err("run-parts");
+		exit(1);
+	}
+	wait(&status);
+	return 0;
+}
+
+int handle_response(struct irc_session *sess, char *user, char *cmd, char *data,
+		    struct sircbot_channel *chan, int numchan)
+{
+	printf("DEBUG: handling response: user=%s, cmd=%s, data=%s\n",
+		   user, cmd, data);
+
+	if (strncmp(cmd, "PING", 4) == 0) {
+		return irc_send(sess, "PONG", data);
+	} else if (strncmp(cmd, "PONG", 4) == 0) {
+		sess->last_pong = time(NULL);
+	} else if (strncmp(cmd, "JOIN", 4) == 0) {
+		return find_channel(chan, numchan, data);
+	} else if (strncmp(cmd, "PRIVMSG", 7) == 0) {
+		char *p = strchr(data, ' ');
+		if (p) {
+			*p++ = '\0';
+			if (*p == ':')
+				p++;
+		}
+		return run_hooks(user, data, p);
+	}
+	return 0;
+}
+
+int parse_line(struct irc_session *sess, char *line, 
+	       struct sircbot_channel *chan, int numchan)
+{
+	char *user = NULL, *p, *cmd, *data = NULL;
+	printf("DEBUG: parsing: '%s'\n", line);
+
+	if (line[0] == ':') {
+		user = &line[1];
+		p = strchr(user, ' ');
+		if (p == NULL)
+			return -1;
+		*p++ = '\0';
+		cmd = p;
+		if ((p = strchr(user, '!')))
+			*p = '\0';
+	} else
+		cmd = line;
+	p = strchr(cmd, ' ');
+	if (p) {
+		*p++ = '\0';
+		data = p;
+		if (*data == ':')
+			data++;
+	}
+//	printf("DEBUG: user='%s', cmd='%s', data='%s'\n", user, cmd, data);
+	handle_response(sess, user, cmd, data, chan, numchan);
+	return 0;
+}
+
+int parse_irc_data(char *buf, struct sircbot_channel *chan, int numchan,
+		   struct irc_session *sess)
+{
+	char *p = buf;
+	while ((p = strsep(&buf, "\n")) != NULL) {
+		char *c = strchr(p, '\r');
+		if (c != NULL)
+			*c = '\0';
+		if (*p != '\0')
+			parse_line(sess, p, chan, numchan);
+	}
+	return 0;
+}
+
+static int irc_loop(struct irc_session *sess, struct sircbot_channel *chan,
+		    int numchan)
+{
+	int i, r, joined = 0;
+	char buf[1024];
+	struct pollfd fds[numchan + 1];
+	sigset_t sigmask;
+	struct timespec tv;
+
+	for (i = 0; i < numchan; i++)
+		irc_send(sess, "JOIN", chan[i].name);
+
+	sigemptyset(&sigmask);
+	sigaddset(&sigmask, SIGTERM);
+	tv.tv_sec = 120;
+	tv.tv_nsec = 0;
+	while (!sigterm) {
+		/* init pollfd strucs */
+		fds[0].fd = sess->fd;
+		fds[0].events = POLLIN;
+		fds[0].revents = 0;
+		for (i = 1; i < numchan + 1; i++) {
+			fds[i].fd = chan[i-1].fd;
+			fds[i].events = POLLIN;
+			fds[i].revents = 0;
+		}
+		//r = ppoll(fds, numchan+1, &tv, &sigmask);
+		r = poll(fds, numchan+1, 120000);
+		if (r < 0) {
+			log_err("poll");
+			return -1;
+		} else if (r == 0) {
+			/* timeout */
+			irc_send_ping(sess);
+			continue;
+		}
+		for (i = 0; i < numchan + 1; i++) {
+			int j;
+			if (!(fds[i].revents & POLLIN))
+				continue;
+
+			printf("DEBUG: data available from fds[%i]\n", i);
+			r = read(fds[i].fd, buf, sizeof(buf)-1);
+			if (r < 0)
+				goto ret_err;
+				
+			printf("DEBUG: read %i bytes\n", r);
+
+			buf[r] = '\0';
+			if (i == 0) {
+				/* data was from IRC server */
+				printf("DEBUG: data from server: %s\n", buf);
+				parse_irc_data(buf, chan, numchan, sess);
+				continue;
+			}
+			
+			/* data was from fifos */
+			printf("DEBUG: data from fifo %s: %s\n", chan[i-1].name, buf);
+			r = irc_send_chan(sess, chan[i-1].name, buf);
+			if (r < 0)
+				goto ret_err;
+		}
+	}
+	return 0;
+
+ret_err:
+	log_err(sess->server);
+	return -1;
+}
+
+void sighandler(int signal)
+{
+	switch (signal) {
+	case SIGTERM:
+		sigterm = 1;
+		break;
+	}
+}
+
+static void usage_exit(int exitcode)
+{
+	printf("usage: sircbot [-f] [-n nick] [-s server] [-p port] CHANNEL\n");
+	exit(exitcode);
+}
+
+int main(int argc, char *argv[])
+{
+	const char *pidfile = DEFAULT_PIDFILE;
+	const char *server = "irc.freenode.org";
+	const char *nick = "sircbot";
+	const char *user = "sircbot";
+	const char *group = "sircbot";
+	const char *pass = NULL;
+	struct sircbot_channel *chan;
+	int i, c, port = 6667;
+
+	while ((c = getopt(argc, argv, "fn:p:P:s:")) != -1) {
+		switch (c) {
+		case 'f':
+			foreground = 1;
+			break;
+		case 'n':
+			nick = optarg;
+			break;
+		case 'P':
+			pass = optarg;
+			break;
+		case 'p':
+			port = atoi(optarg);
+			break;
+		case 's':
+			server = optarg;
+			break;
+		default:
+			usage_exit(1);
+		}
+	}
+
+	argv += optind;
+	argc -= optind;
+	if (argc <= 0)
+		usage_exit(1);
+
+	/* init channel strucs */
+	chan = malloc(argc * sizeof(struct sircbot_channel));
+	if (chan == NULL)
+		err(1, "malloc");
+	for (i = 0; i < argc; i++) {
+		chan[i].fd = -1;
+		chan[i].name = strdup(argv[i]);
+		asprintf(&chan[i].fifo, "/var/run/sircbot/%s", argv[i]);
+		unlink(chan[i].fifo);
+	}
+
+	/* daemonize */
+	if (!foreground) {
+		if (daemonize(pidfile) < 0)
+			return 1;
+	}
+	signal(SIGTERM, sighandler);
+	openlog("sircbot",0, LOG_DAEMON);
+
+	while (!sigterm) {
+		struct irc_session *s = irc_connect(server, port, nick, pass);
+		char buf[256];
+
+		if (s == NULL) {
+			log_err(server);
+			sleep(5);
+			continue;
+		}
+		
+		irc_loop(s, chan, argc);
+		irc_close(s, "bye");
+		/* reset fifos */
+		for (i = 0; i < argc; i++) {
+			close(chan[i].fd);
+			chan[i].fd = -1;
+			unlink(chan[i].fifo);
+		}
+	}
+	unlink(pidfile);
+	return 0;
+}
+