X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=client_common.c;h=a7115fd75ac33495d9dd36862ff446757bd9666c;hp=c1e23f7a53d228bde4b3c26149432a71029327ad;hb=ab273892c54e29087d2a6b0d52de8081be1b905f;hpb=eea9d1cae30df921ae2fd1771518b8b21dbd0daf

diff --git a/client_common.c b/client_common.c
index c1e23f7a..a7115fd7 100644
--- a/client_common.c
+++ b/client_common.c
@@ -1,13 +1,15 @@
 /*
- * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2011 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file client_common.c Common functions of para_client and para_audiod. */
 
+#include <regex.h>
 #include <sys/types.h>
 #include <dirent.h>
+#include <openssl/rc4.h>
 
 #include "para.h"
 #include "error.h"
@@ -21,33 +23,11 @@
 #include "string.h"
 #include "client.cmdline.h"
 #include "client.h"
+#include "hash.h"
+#include "buffer_tree.h"
 
-/*
- * Rc4-encrypt data before sending.
- *
- * \param len The number of bytes to encrypt.
- * \param indata Pointer to the input data of length \a len to be encrypted.
- * \param outdata Result-pointer that holds the encrypted data.
- * \param private_data Contains the rc4 key.
- */
-static void rc4_send(unsigned long len, const unsigned char *indata,
-		unsigned char *outdata, void *private_data)
-{
-	struct client_task *ct = private_data;
-	RC4(&ct->rc4_send_key, len, indata, outdata);
-}
-
-/*
- * Rc4-decrypt received data.
- *
- * Parameters are identical to those of rc4_send.
- */
-static void rc4_recv(unsigned long len, const unsigned char *indata,
-		unsigned char *outdata, void *private_data)
-{
-	struct client_task *ct = private_data;
-	RC4(&ct->rc4_recv_key, len, indata, outdata);
-}
+/** The size of the receiving buffer. */
+#define CLIENT_BUFSIZE 4000
 
 /**
  * Close the connection to para_server and free all resources.
@@ -60,10 +40,8 @@ void client_close(struct client_task *ct)
 {
 	if (!ct)
 		return;
-	if (ct->fd >= 0) {
-		disable_crypt(ct->fd);
-		close(ct->fd);
-	}
+	if (ct->rc4c.fd >= 0)
+		close(ct->rc4c.fd);
 	free(ct->user);
 	free(ct->config_file);
 	free(ct->key_file);
@@ -87,62 +65,71 @@ void client_close(struct client_task *ct)
  */
 static void client_pre_select(struct sched *s, struct task *t)
 {
+	int ret;
 	struct client_task *ct = container_of(t, struct client_task, task);
+	struct btr_node *btrn = ct->btrn;
 
-	ct->check_r = 0;
-	ct->check_w = 0;
-	if (ct->fd < 0)
+	if (ct->rc4c.fd < 0)
 		return;
 	switch (ct->status) {
 	case CL_CONNECTED:
 	case CL_SENT_AUTH:
 	case CL_SENT_CH_RESPONSE:
 	case CL_SENT_COMMAND:
-		para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
-		ct->check_r = 1;
+		para_fd_set(ct->rc4c.fd, &s->rfds, &s->max_fileno);
 		return;
 
 	case CL_RECEIVED_WELCOME:
-	case CL_RECEIVED_CHALLENGE:
 	case CL_RECEIVED_PROCEED:
-		para_fd_set(ct->fd, &s->wfds, &s->max_fileno);
-		ct->check_w = 1;
+		para_fd_set(ct->rc4c.fd, &s->wfds, &s->max_fileno);
 		return;
 
 	case CL_RECEIVING:
-		if (ct->loaded < CLIENT_BUFSIZE - 1) {
-			para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
-			ct->check_r = 1;
+		ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
+		if (ret != 0) {
+			if (ret < 0)
+				sched_min_delay(s);
+			else
+				para_fd_set(ct->rc4c.fd, &s->rfds,
+					&s->max_fileno);
 		}
 		return;
 	case CL_SENDING:
-		if (!ct->in_loaded) /* stdin task not yet started */
-			return;
-		if (*ct->in_loaded) {
-			PARA_INFO_LOG("loaded: %zd\n", *ct->in_loaded);
-			para_fd_set(ct->fd, &s->wfds, &s->max_fileno);
-			ct->check_w = 1;
-		} else {
-			if (*ct->in_error) {
-				t->error = *ct->in_error;
-				s->timeout.tv_sec = 0;
-				s->timeout.tv_usec = 1;
-			}
+		ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
+		if (ret != 0) {
+			if (ret < 0)
+				sched_min_delay(s);
+			else
+				para_fd_set(ct->rc4c.fd, &s->wfds,
+					&s->max_fileno);
 		}
 		return;
 	}
 }
 
-static ssize_t client_recv_buffer(struct client_task *ct)
+static int client_recv_buffer(struct client_task *ct, fd_set *rfds,
+		char *buf, size_t sz, size_t *n)
 {
-	ssize_t ret = recv_buffer(ct->fd, ct->buf + ct->loaded,
-		CLIENT_BUFSIZE - ct->loaded);
-	if (!ret)
-		return -E_SERVER_EOF;
-	if (ret > 0)
-		ct->loaded += ret;
-	return ret;
+	int ret;
+
+	if (ct->status < CL_SENT_CH_RESPONSE)
+		return read_nonblock(ct->rc4c.fd, buf, sz, rfds, n);
 
+	*n = 0;
+	ret = rc4_recv_buffer(&ct->rc4c, buf, sz);
+	/*
+	 * rc4_recv_buffer is used with blocking fds elsewhere, so it
+	 * does not use the nonblock-API. Therefore we need to
+	 * check for EOF and EAGAIN.
+	 */
+	if (ret == 0)
+		return -E_SERVER_EOF;
+	if (ret == -ERRNO_TO_PARA_ERROR(EAGAIN))
+		return 0;
+	if (ret < 0)
+		return ret;
+	*n = ret;
+	return 0;
 }
 
 /**
@@ -161,87 +148,84 @@ static ssize_t client_recv_buffer(struct client_task *ct)
 static void client_post_select(struct sched *s, struct task *t)
 {
 	struct client_task *ct = container_of(t, struct client_task, task);
+	struct btr_node *btrn = ct->btrn;
+	int ret = 0;
+	size_t n;
+	char buf[CLIENT_BUFSIZE];
 
 	t->error = 0;
-	if (ct->fd < 0)
-		return;
-	if (!ct->check_r && !ct->check_w)
-		return;
-	if (ct->check_r && !FD_ISSET(ct->fd, &s->rfds))
-		return;
-	if (ct->check_w && !FD_ISSET(ct->fd, &s->wfds))
+	if (ct->rc4c.fd < 0)
 		return;
 	switch (ct->status) {
 	case CL_CONNECTED: /* receive welcome message */
-		t->error = client_recv_buffer(ct);
-		if (t->error > 0)
-			ct->status = CL_RECEIVED_WELCOME;
+		ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
+		if (ret < 0 || n == 0)
+			goto out;
+		ct->status = CL_RECEIVED_WELCOME;
 		return;
 	case CL_RECEIVED_WELCOME: /* send auth command */
-		sprintf(ct->buf, "auth %s%s", ct->conf.plain_given?
-			"" : "rc4 ", ct->user);
-		PARA_INFO_LOG("--> %s\n", ct->buf);
-		t->error = send_buffer(ct->fd, ct->buf);
-		if (t->error >= 0)
-			ct->status = CL_SENT_AUTH;
-		return;
-	case CL_SENT_AUTH: /* receive challenge number */
-		ct->loaded = 0;
-		t->error = client_recv_buffer(ct);
-		if (t->error < 0)
+		sprintf(buf, AUTH_REQUEST_MSG "%s", ct->user);
+		PARA_INFO_LOG("--> %s\n", buf);
+		if (!FD_ISSET(ct->rc4c.fd, &s->wfds))
 			return;
-		if (t->error != 64) {
-			t->error = -E_INVALID_CHALLENGE;
-			PARA_ERROR_LOG("received the following: %s\n", ct->buf);
-			return;
-		}
-		PARA_INFO_LOG("<-- [challenge]\n");
-		/* decrypt challenge number */
-		t->error = para_decrypt_challenge(ct->key_file, &ct->challenge_nr,
-			(unsigned char *) ct->buf, 64);
-		if (t->error > 0)
-			ct->status = CL_RECEIVED_CHALLENGE;
+		ret = send_buffer(ct->rc4c.fd, buf);
+		if (ret < 0)
+			goto out;
+		ct->status = CL_SENT_AUTH;
 		return;
-	case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
-		PARA_INFO_LOG("--> %lu\n", ct->challenge_nr);
-		t->error = send_va_buffer(ct->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
-			ct->challenge_nr);
-		if (t->error > 0)
-			ct->status = CL_SENT_CH_RESPONSE;
+	case CL_SENT_AUTH:
+		/*
+		 * Receive challenge and rc4 keys, decrypt the challenge and
+		 * send back the hash of the decrypted challenge.
+		 */
+		{
+		/* decrypted challenge/rc4 buffer */
+		unsigned char crypt_buf[1024];
+		/* the SHA1 of the decrypted challenge */
+		unsigned char challenge_sha1[HASH_SIZE];
+
+		ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
+		if (ret < 0 || n == 0)
+			goto out;
+		PARA_INFO_LOG("<-- [challenge] (%zu bytes)\n", n);
+		ret = para_decrypt_buffer(ct->key_file, crypt_buf,
+			(unsigned char *)buf, n);
+		if (ret < 0)
+			goto out;
+		sha1_hash((char *)crypt_buf, CHALLENGE_SIZE, challenge_sha1);
+		RC4_set_key(&ct->rc4c.send_key, RC4_KEY_LEN,
+			crypt_buf + CHALLENGE_SIZE);
+		RC4_set_key(&ct->rc4c.recv_key, RC4_KEY_LEN,
+			crypt_buf + CHALLENGE_SIZE + RC4_KEY_LEN);
+		hash_to_asc(challenge_sha1, buf);
+		PARA_INFO_LOG("--> %s\n", buf);
+		ret = send_bin_buffer(ct->rc4c.fd, (char *)challenge_sha1,
+			HASH_SIZE);
+		if (ret < 0)
+			goto out;
+		ct->status = CL_SENT_CH_RESPONSE;
 		return;
+		}
 	case CL_SENT_CH_RESPONSE: /* read server response */
 		{
-		size_t bytes_received;
-		unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
-		ct->loaded = 0;
-		t->error = client_recv_buffer(ct);
-		if (t->error < 0)
-			return;
-		bytes_received = t->error;
-		PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
-			"info ++++\n", ct->buf);
+		ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
+		if (ret < 0 || n == 0)
+			goto out;
 		/* check if server has sent "Proceed" message */
-		t->error = -E_CLIENT_AUTH;
-		if (!strstr(ct->buf, PROCEED_MSG))
-			return;
-		t->error = 0;
+		ret = -E_CLIENT_AUTH;
+		if (n < PROCEED_MSG_LEN)
+			goto out;
+		if (!strstr(buf, PROCEED_MSG))
+			goto out;
 		ct->status = CL_RECEIVED_PROCEED;
-		if (bytes_received < PROCEED_MSG_LEN + 32)
-			return;
-		PARA_INFO_LOG("decrypting session key\n");
-		t->error = para_decrypt_buffer(ct->key_file, rc4_buf,
-			(unsigned char *)ct->buf + PROCEED_MSG_LEN + 1,
-			bytes_received - PROCEED_MSG_LEN - 1);
-		if (t->error < 0)
-			return;
-		RC4_set_key(&ct->rc4_send_key, RC4_KEY_LEN, rc4_buf);
-		RC4_set_key(&ct->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
-		enable_crypt(ct->fd, rc4_recv, rc4_send, ct);
+		return;
 		}
 	case CL_RECEIVED_PROCEED: /* concat args and send command */
 		{
 		int i;
 		char *command = NULL;
+		if (!FD_ISSET(ct->rc4c.fd, &s->wfds))
+			return;
 		for (i = 0; i < ct->conf.inputs_num; i++) {
 			char *tmp = command;
 			command = make_message("%s\n%s", command?
@@ -250,32 +234,79 @@ static void client_post_select(struct sched *s, struct task *t)
 		}
 		command = para_strcat(command, EOC_MSG "\n");
 		PARA_DEBUG_LOG("--> %s\n", command);
-		t->error = send_buffer(ct->fd, command);
+		ret = rc4_send_buffer(&ct->rc4c, command);
 		free(command);
-		if (t->error > 0)
-			ct->status = CL_SENT_COMMAND;
+		if (ret < 0)
+			goto out;
+		ct->status = CL_SENT_COMMAND;
 		return;
 		}
 	case CL_SENT_COMMAND:
-		ct->loaded = 0;
-		t->error = client_recv_buffer(ct);
-		if (t->error < 0)
-			return;
-		if (strstr(ct->buf, AWAITING_DATA_MSG))
-			ct->status = CL_SENDING;
-		else
+		{
+		char *buf2;
+		/* can not use "buf" here because we need a malloced buffer */
+		buf2 = para_malloc(CLIENT_BUFSIZE);
+		ret = client_recv_buffer(ct, &s->rfds, buf2, CLIENT_BUFSIZE, &n);
+		if (n > 0) {
+			if (strstr(buf2, AWAITING_DATA_MSG)) {
+				free(buf2);
+				ct->status = CL_SENDING;
+				return;
+			}
 			ct->status = CL_RECEIVING;
-		return;
-	case CL_SENDING: /* FIXME: might block */
-		PARA_INFO_LOG("loaded: %zd\n", *ct->in_loaded);
-		t->error = send_bin_buffer(ct->fd, ct->inbuf, *ct->in_loaded);
-		if (t->error < 0)
+			btr_add_output(buf2, n, btrn);
+		} else
+			free(buf2);
+		goto out;
+		}
+	case CL_SENDING:
+		{
+		char *buf2;
+		size_t sz;
+		ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
+		if (ret < 0)
+			goto out;
+		if (ret == 0)
 			return;
-		*ct->in_loaded = 0;
+		if (!FD_ISSET(ct->rc4c.fd, &s->wfds))
+			return;
+		sz = btr_next_buffer(btrn, &buf2);
+		ret = rc4_send_bin_buffer(&ct->rc4c, buf2, sz);
+		if (ret < 0)
+			goto out;
+		btr_consume(btrn, sz);
 		return;
+		}
 	case CL_RECEIVING:
-		t->error = client_recv_buffer(ct);
-		return;
+		{
+		char *buf2;
+		ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
+		if (ret < 0)
+			goto out;
+		if (ret == 0)
+			return;
+		/*
+		 * The FD_ISSET() is not strictly necessary, but is allows us
+		 * to skip the malloc below if there is nothing to read anyway.
+		 */
+		if (!FD_ISSET(ct->rc4c.fd, &s->rfds))
+			return;
+		buf2 = para_malloc(CLIENT_BUFSIZE);
+		ret = client_recv_buffer(ct, &s->rfds, buf2, CLIENT_BUFSIZE, &n);
+		if (n > 0) {
+			buf2 = para_realloc(buf2, n);
+			btr_add_output(buf2, n, btrn);
+		} else
+			free(buf2);
+		goto out;
+		}
+	}
+out:
+	t->error = ret;
+	if (ret < 0) {
+		if (ret != -E_SERVER_EOF && ret != -E_BTR_EOF)
+			PARA_ERROR_LOG("%s\n", para_strerror(-t->error));
+		btr_remove_node(btrn);
 	}
 }
 
@@ -284,14 +315,14 @@ static int client_connect(struct client_task *ct)
 {
 	int ret;
 
-	ct->fd = -1;
-	ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, ct->conf.hostname_arg,
-		ct->conf.server_port_arg);
+	ct->rc4c.fd = -1;
+	ret = para_connect_simple(IPPROTO_TCP, ct->conf.hostname_arg,
+					       ct->conf.server_port_arg);
 	if (ret < 0)
 		return ret;
-	ct->fd = ret;
+	ct->rc4c.fd = ret;
 	ct->status = CL_CONNECTED;
-	ret = mark_fd_nonblocking(ct->fd);
+	ret = mark_fd_nonblocking(ct->rc4c.fd);
 	if (ret < 0)
 		goto err_out;
 	ct->task.pre_select = client_pre_select;
@@ -300,8 +331,8 @@ static int client_connect(struct client_task *ct)
 	register_task(&ct->task);
 	return 1;
 err_out:
-	close(ct->fd);
-	ct->fd = -1;
+	close(ct->rc4c.fd);
+	ct->rc4c.fd = -1;
 	return ret;
 }
 
@@ -313,6 +344,8 @@ err_out:
  * \param ct_ptr Points to dynamically allocated and initialized client task
  * struct upon successful return.
  * \param loglevel If not \p NULL, the number of the loglevel is stored here.
+ * \param parent Add the new buffer tree node as a child of this node.
+ * \param child Add the new buffer tree node as a parent of this node.
  *
  * Check the command line options given by \a argc and argv, set default values
  * for user name and rsa key file, read further option from the config file.
@@ -321,14 +354,16 @@ err_out:
  * \return Standard.
  */
 int client_open(int argc, char *argv[], struct client_task **ct_ptr,
-		int *loglevel)
+		int *loglevel, struct btr_node *parent, struct btr_node *child)
 {
 	char *home = para_homedir();
 	int ret;
 	struct client_task *ct = para_calloc(sizeof(struct client_task));
 
+	ct->btrn = btr_new_node(&(struct btr_node_description)
+		EMBRACE(.name = "client", .parent = parent, .child = child));
 	*ct_ptr = ct;
-	ct->fd = -1;
+	ct->rc4c.fd = -1;
 	ret = -E_CLIENT_SYNTAX;
 	if (client_cmdline_parser(argc, argv, &ct->conf))
 		goto out;
@@ -336,12 +371,6 @@ int client_open(int argc, char *argv[], struct client_task **ct_ptr,
 	ret = -E_CLIENT_SYNTAX;
 	if (!ct->conf.inputs_num)
 		goto out;
-	ct->user = ct->conf.user_given?
-		para_strdup(ct->conf.user_arg) : para_logname();
-
-	ct->key_file = ct->conf.key_file_given?
-		para_strdup(ct->conf.key_file_arg) :
-		make_message("%s/.paraslash/key.%s", home, ct->user);
 
 	ct->config_file = ct->conf.config_file_given?
 		para_strdup(ct->conf.config_file_arg) :
@@ -364,6 +393,13 @@ int client_open(int argc, char *argv[], struct client_task **ct_ptr,
 			&ct->conf, &params))
 			goto out;
 	}
+	ct->user = ct->conf.user_given?
+		para_strdup(ct->conf.user_arg) : para_logname();
+
+	ct->key_file = ct->conf.key_file_given?
+		para_strdup(ct->conf.key_file_arg) :
+		make_message("%s/.paraslash/key.%s", home, ct->user);
+
 	if (loglevel)
 		*loglevel = get_loglevel_by_name(ct->conf.loglevel_arg);
 	PARA_INFO_LOG("loglevel: %s\n", ct->conf.loglevel_arg);
@@ -376,6 +412,8 @@ out:
 	free(home);
 	if (ret < 0) {
 		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+		btr_remove_node(ct->btrn);
+		btr_free_node(ct->btrn);
 		client_close(ct);
 		*ct_ptr = NULL;
 	}