/* radare - LGPL - Copyright 2011-2016 - pancake */

#include "r_io.h"
#include "r_lib.h"
#include "r_core.h"
#include "r_socket.h"
#include <sys/types.h>

// TODO: implement the rap API in r_socket ?
#define RIORAP_FD(x) ((x->data)?(((RIORap*)(x->data))->client):NULL)
#define RIORAP_IS_LISTEN(x) (((RIORap*)(x->data))->listener)
#define RIORAP_IS_VALID(x) ((x) && (x->data) && (x->plugin == &r_io_plugin_rap))

static int rap__write(RIO *io, RIODesc *fd, const ut8 *buf, int count) {
	RSocket *s = RIORAP_FD (fd);
	ut8 *tmp;
	int ret;

	// TOOD: if count > RMT_MAX iterate !
	if (count > RMT_MAX)
		count = RMT_MAX;
	if (!(tmp = (ut8 *)malloc (count + 5))) {
		eprintf ("rap__write: malloc failed\n");
		return -1;
	}
	tmp[0] = RMT_WRITE;
	r_write_be32 (tmp + 1, count);
	memcpy (tmp + 5, buf, count);

	ret = r_socket_write (s, tmp, count + 5);
	r_socket_flush (s);
	if (r_socket_read (s, tmp, 5) != 5) { // TODO read_block?
		eprintf ("rap__write: error\n");
		ret = -1;
	}
	free (tmp);
	// TODO: get reply
	return ret;
}

static bool rap__accept(RIO *io, RIODesc *desc, int fd) {
	RIORap *rap = desc->data;
	if (rap) {
		rap->client = r_socket_new_from_fd (fd);
		return true;
	}
	return false;
}

static int rap__read(RIO *io, RIODesc *fd, ut8 *buf, int count) {
	RSocket *s = RIORAP_FD (fd);
	int ret, i = (int)count;
	ut8 tmp[5];

	// XXX. if count is > RMT_MAX, just perform multiple queries
	if (count > RMT_MAX)
		count = RMT_MAX;
	// send
	tmp[0] = RMT_READ;
	r_write_be32 (tmp + 1, count);
	r_socket_write (s, tmp, 5);
	r_socket_flush (s);
	// recv
	ret = r_socket_read_block (s, tmp, 5);
	if (ret != 5 || tmp[0] != (RMT_READ | RMT_REPLY)) {
		eprintf ("rap__read: Unexpected rap read reply "
			"(%d=0x%02x) expected (%d=0x%02x)\n",
			ret, tmp[0], 2, (RMT_READ | RMT_REPLY));
		return -1;
	}
	i = r_read_at_be32 (tmp, 1);
	if (i>count) {
		eprintf ("rap__read: Unexpected data size %d\n", i);
		return -1;
	}
	r_socket_read_block (s, buf, i);
	return count;
}

static int rap__close(RIODesc *fd) {
	int ret = -1;
	if (RIORAP_IS_VALID (fd)) {
		if (RIORAP_FD (fd) != NULL) {
			RIORap *r = fd->data;
			fd->state = R_IO_DESC_TYPE_CLOSED;
			ret = r_socket_close (r->fd);
			ret = r_socket_close (r->client);
			//ret = r_socket_close (r->client);
			free (fd->data);
			fd->data = NULL;
		}
	} else eprintf ("rap__close: fdesc is not a r_io_rap plugin\n");
	return ret;
}

static ut64 rap__lseek(RIO *io, RIODesc *fd, ut64 offset, int whence) {
	RSocket *s = RIORAP_FD (fd);
	ut8 tmp[10];
	int ret;
	// query
	tmp[0] = RMT_SEEK;
	tmp[1] = (ut8)whence;
	r_write_be64 (tmp + 2, offset);
	r_socket_write (s, &tmp, 10);
	r_socket_flush (s);
	// get reply
	ret = r_socket_read_block (s, (ut8*)&tmp, 9);
	if (ret != 9 || tmp[0] != (RMT_SEEK | RMT_REPLY)) {
		eprintf ("Unexpected lseek reply\n");
		return -1;
	}
	offset = r_read_at_be64 (tmp, 1);
	return offset;
}

static bool rap__plugin_open(RIO *io, const char *pathname, bool many) {
	return (!strncmp (pathname, "rap://", 6)) \
		|| (!strncmp (pathname, "raps://", 7));
}

static RIODesc *rap__open(RIO *io, const char *pathname, int rw, int mode) {
	int i, p, listenmode;
	char *file, *port;
	const char *ptr;
	RSocket *rap_fd;
	char buf[1024];
	RIORap *rior;

	if (!rap__plugin_open (io, pathname, 0))
		return NULL;
	bool is_ssl = (!strncmp (pathname, "raps://", 7));
	ptr = pathname + (is_ssl? 7: 6);
	if (!(port = strchr (ptr, ':'))) {
		eprintf ("rap: wrong uri\n");
		return NULL;
	}
	listenmode = (*ptr == ':');
	*port++ = 0;
	if (!*port) {
		return NULL;
	}
	p = atoi (port);
	if ((file = strchr (port + 1, '/'))) {
		*file = 0;
		file++;
	}
	if (r_sandbox_enable (0)) {
		eprintf ("sandbox: Cannot use network\n");
		return NULL;
	}
	if (listenmode) {
		if (p <= 0) {
			eprintf ("rap: cannot listen here. Try rap://:9999\n");
			return NULL;
		}
		//TODO: Handle ^C signal (SIGINT, exit); // ???
		eprintf ("rap: listening at port %s ssl %s\n", port, (is_ssl)?"on":"off");
		rior = R_NEW0 (RIORap);
		rior->listener = true;
		rior->client = rior->fd = r_socket_new (is_ssl);
		if (rior->fd == NULL) {
			free (rior);
			return NULL;
		}
		if (is_ssl) {
			if (file && *file) {
				if (!r_socket_listen (rior->fd, port, file)) {
					free (rior);
					return NULL;
				}
			} else {
				free (rior);
				return NULL;
			}
		} else {
			if (!r_socket_listen (rior->fd, port, NULL))
				return NULL;
		}
		return r_io_desc_new (&r_io_plugin_rap, rior->fd->fd,
			pathname, rw, mode, rior);
	}
	if ((rap_fd = r_socket_new (is_ssl)) == NULL) {
		eprintf ("Cannot create new socket\n");
		return NULL;
	}
	if (r_socket_connect_tcp (rap_fd, ptr, port, 30) == false) {
		eprintf ("Cannot connect to '%s' (%d)\n", ptr, p);
		r_socket_free (rap_fd);
		return NULL;
	}
	eprintf ("Connected to: %s at port %s\n", ptr, port);
	rior = R_NEW0 (RIORap);
	rior->listener = false;
	rior->client = rior->fd = rap_fd;
	if (file && *file) {
		// send
		buf[0] = RMT_OPEN;
		buf[1] = rw;
		buf[2] = (ut8)strlen (file);
		memcpy (buf+3, file, buf[2]);
		r_socket_write (rap_fd, buf, 3+buf[2]);
		r_socket_flush (rap_fd);
		// read
		eprintf ("waiting... ");
		buf[0] = 0;
		r_socket_read_block (rap_fd, (ut8*)buf, 5);
		if (buf[0] != (char)(RMT_OPEN | RMT_REPLY)) {
			eprintf ("rap: Expecting OPEN|REPLY packet. got %02x\n", buf[0]);
			r_socket_free (rap_fd);
			free (rior);
			return NULL;
		}
		i = r_read_at_be32 (buf, 1);
		if (i > 0) eprintf ("ok\n");
#if 0
		/* Read meta info */
		r_socket_read (rap_fd, (ut8 *)&buf, 4);
		r_mem_copyendian ((ut8 *)&i, (ut8*)buf, 4, ENDIAN);
		while (i>0) {
			int n = r_socket_read (rap_fd, (ut8 *)&buf, i);
			if (n<1) break;
			buf[i] = 0;
			io->core_cmd_cb (io->user, buf);
			n = r_socket_read (rap_fd, (ut8 *)&buf, 4);
			if (n<1) break;
			r_mem_copyendian ((ut8 *)&i, (ut8*)buf, 4, ENDIAN);
			i -= n;
		}
#endif
	} else {
		r_socket_free (rap_fd);
		free (rior);
		return NULL;
	}
	//r_socket_free (rap_fd);
	return r_io_desc_new (&r_io_plugin_rap, rior->fd->fd,
		pathname, rw, mode, rior);
}

static int rap__listener(RIODesc *fd) {
	return (RIORAP_IS_VALID (fd))? RIORAP_IS_LISTEN (fd): 0; // -1 ?
}

static int rap__system(RIO *io, RIODesc *fd, const char *command) {
	int ret, reslen = 0, cmdlen = 0;
	RSocket *s = RIORAP_FD (fd);
	unsigned int i, j = 0;
	char *ptr, *res, *str;
	ut8 buf[RMT_MAX];

	buf[0] = RMT_CMD;
	i = strlen (command) + 1;
	if (i > RMT_MAX - 5) {
		eprintf ("Command too long\n");
		return -1;
	}
	r_write_be32 (buf + 1, i);
	memcpy (buf + 5, command, i);
	r_socket_write (s, buf, i+5);
	r_socket_flush (s);

	/* read reverse cmds */
	for (;;) {
		ret = r_socket_read_block (s, buf, 1);
		if (ret != 1) {
			return -1;
		}
		/* system back in the middle */
		/* TODO: all pkt handlers should check for reverse queries */
		if (buf[0] != RMT_CMD) {
			break;
		}
		// run io->cmdstr
		// return back the string
		buf[0] |= RMT_REPLY;
		memset (buf + 1, 0, 4);
		ret = r_socket_read_block (s, buf + 1, 4);
		cmdlen = r_read_at_be32 (buf, 1);
		if (cmdlen + 1 == 0) // check overflow
			cmdlen = 0;
		str = calloc (1, cmdlen + 1);
		ret = r_socket_read_block (s, (ut8*)str, cmdlen);
		eprintf ("RUN %d CMD(%s)\n", ret, str);
		if (str && *str) {
			res = io->cb_core_cmdstr (io->user, str);
		} else {
			res = strdup ("");
		}
		eprintf ("[%s]=>(%s)\n", str, res);
		reslen = strlen (res);
		free (str);
		r_write_be32 (buf + 1, reslen);
		memcpy (buf + 5, res, reslen);
		free (res);
		r_socket_write (s, buf, reslen + 5);
		r_socket_flush (s);
	}

	// read
	ret = r_socket_read_block (s, buf + 1, 4);
	if (ret != 4)
		return -1;
	if (buf[0] != (RMT_CMD | RMT_REPLY)) {
		eprintf ("Unexpected rap cmd reply\n");
		return -1;
	}

	i = r_read_at_be32 (buf, 1);
	ret = 0;
	if (i > ST32_MAX) {
		eprintf ("Invalid length\n");
		return -1;
	}
	ptr = (char *)calloc (1, i + 1);
	if (ptr) {
		int ir, tr = 0;
		do {
			ir = r_socket_read_block (s, (ut8*)ptr + tr, i - tr);
			if (ir < 1) break;
			tr += ir;
		} while (tr < i);
		// TODO: use io->cb_printf() with support for \x00
		ptr[i] = 0;
		if (io->cb_printf) {
			io->cb_printf ("%s", ptr);
			j = i;
		} else {
			j = write (1, ptr, i);
		}
		free (ptr);
	}
#if DEAD_CODE
	/* Clean */
	if (ret > 0) {
		ret -= r_socket_read (s, (ut8*)buf, RMT_MAX);
	}
#endif
	return i - j;
}

RIOPlugin r_io_plugin_rap = {
	.name = "rap",
	.desc = "radare network protocol (rap://:port rap://host:port/file)",
	.license = "LGPL3",
	.listener = rap__listener,
	.open = rap__open,
	.close = rap__close,
	.read = rap__read,
	.check = rap__plugin_open,
	.lseek = rap__lseek,
	.system = rap__system,
	.write = rap__write,
	.accept = rap__accept,
};

#ifndef CORELIB
struct r_lib_struct_t radare_plugin = {
	.type = R_LIB_TYPE_IO,
	.data = &r_io_plugin_rap,
	.version = R2_VERSION
};
#endif