Add sharkd - daemon variant

sharkd listens on UNIX socket and allows external clients
to run commands like: loading file, analysing frames or running TAP(s).

Change-Id: I443b2865e4adfd1c11f4f57d09ff7fce6b1e8766
Reviewed-on: https://code.wireshark.org/review/18208
Petri-Dish: Jakub Zawadzki <darkjames-ws@darkjames.pl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Jakub Zawadzki <darkjames-ws@darkjames.pl>

1 files changed, 223 insertions, 0 deletions

diff --git a/sharkd_daemon.c b/sharkd_daemon.c
new file mode 100644
index 0000000000..1f7981b9ed
--- /dev/null
+++ b/sharkd_daemon.c
@@ -0,0 +1,223 @@
+/* sharkd_daemon.c
+ *
+ * Copyright (C) 2016 Jakub Zawadzki
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include <glib.h>
+
+#include <stdio.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+
+#include <wsutil/strtoi.h>
+
+#include "sharkd.h"
+
+static int _server_fd = -1;
+
+static int
+socket_init(char *path)
+{
+	int fd = -1;
+
+	if (!strncmp(path, "unix:", 5))
+	{
+		struct sockaddr_un s_un;
+		size_t s_un_len;
+
+		path += 5;
+
+		if (strlen(path) + 1 > sizeof(s_un.sun_path))
+			return -1;
+
+		fd = socket(AF_UNIX, SOCK_STREAM, 0);
+		if (fd == -1)
+			return -1;
+
+		memset(&s_un, 0, sizeof(s_un));
+		s_un.sun_family = AF_UNIX;
+		g_strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path));
+
+		s_un_len = offsetof(struct sockaddr_un, sun_path) + strlen(s_un.sun_path);
+
+		if (s_un.sun_path[0] == '@')
+			s_un.sun_path[0] = '\0';
+
+		if (bind(fd, (struct sockaddr *) &s_un, s_un_len))
+		{
+			close(fd);
+			return -1;
+		}
+
+	}
+#ifdef SHARKD_TCP_SUPPORT
+	else if (!strncmp(path, "tcp:", 4))
+	{
+		struct sockaddr_in s_in;
+		int one = 1;
+		char *port_sep;
+		guint16 port;
+
+		path += 4;
+
+		port_sep = strchr(path, ':');
+		if (!port_sep)
+			return -1;
+
+		*port_sep = '\0';
+
+		if (ws_strtou16(port_sep + 1, NULL, &port) == FALSE)
+			return -1;
+
+		fd = socket(AF_INET, SOCK_STREAM, 0);
+		if (fd == -1)
+			return -1;
+
+		s_in.sin_family = AF_INET;
+		s_in.sin_addr.s_addr = inet_addr(path);
+		s_in.sin_port = g_htons(port);
+		*port_sep = ':';
+
+		setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+
+		if (bind(fd, (struct sockaddr *) &s_in, sizeof(struct sockaddr_in)))
+		{
+			close(fd);
+			return -1;
+		}
+	}
+#endif
+	else
+	{
+		return -1;
+	}
+
+	if (listen(fd, SOMAXCONN))
+	{
+		close(fd);
+		return -1;
+	}
+
+	return fd;
+}
+
+int
+sharkd_init(int argc, char **argv)
+{
+	int fd;
+	pid_t pid;
+
+	if (argc != 2)
+	{
+		fprintf(stderr, "Usage: %s <socket>\n", argv[0]);
+		fprintf(stderr, "\n");
+
+		fprintf(stderr, "<socket> examples:\n");
+		fprintf(stderr, " - unix:/tmp/sharkd.sock - listen on unix file /tmp/sharkd.sock\n");
+#ifdef SHARKD_TCP_SUPPORT
+		fprintf(stderr, " - tcp:127.0.0.1:4446 - listen on TCP port 4446\n");
+#endif
+		fprintf(stderr, "\n");
+		return -1;
+	}
+
+	signal(SIGCHLD, SIG_IGN);
+
+	fd = socket_init(argv[1]);
+	if (fd == -1)
+		return -1;
+
+	/* all good - try to daemonize */
+	pid = fork();
+	if (pid == -1)
+		fprintf(stderr, "cannot go to background fork() failed: %s\n", g_strerror(errno));
+
+	if (pid != 0)
+	{
+		/* parent */
+		exit(0);
+	}
+
+	_server_fd = fd;
+	return 0;
+}
+
+int
+sharkd_loop(void)
+{
+	while (1)
+	{
+		int fd;
+		pid_t pid;
+
+		fd = accept(_server_fd, NULL, NULL);
+		if (fd == -1)
+		{
+			fprintf(stderr, "cannot accept(): %s\n", g_strerror(errno));
+			continue;
+		}
+
+		/* wireshark is not ready for handling multiple capture files in single process, so fork(), and handle it in seperate process */
+		pid = fork();
+		if (pid == 0)
+		{
+			/* redirect stdin, stdout to socket */
+			dup2(fd, 0);
+			dup2(fd, 1);
+			close(fd);
+
+			exit(sharkd_session_main());
+		}
+
+		if (pid == -1)
+		{
+			fprintf(stderr, "cannot fork(): %s\n", g_strerror(errno));
+		}
+
+		close(fd);
+	}
+
+	return 0;
+}
+
+/*
+ * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */