+/*
+ * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ */
+
+/** \file client_common.c common functions of para_client and para_audiod */
+
+#include "para.h"
+#include "list.h"
+#include "sched.h"
+#include "client.cmdline.h"
+#include "crypt.h"
+#include "rc4.h"
+#include "net.h"
+#include "fd.h"
+#include "string.h"
+#include "client.h"
+#include "error.h"
+
+void rc4_send(unsigned long len, const unsigned char *indata,
+ unsigned char *outdata, void *private_data)
+{
+ struct private_client_data *pcd = private_data;
+ RC4(&pcd->rc4_send_key, len, indata, outdata);
+}
+
+void rc4_recv(unsigned long len, const unsigned char *indata,
+ unsigned char *outdata, void *private_data)
+{
+ struct private_client_data *pcd = private_data;
+ RC4(&pcd->rc4_recv_key, len, indata, outdata);
+}
+
+
+void client_close(struct private_client_data *pcd)
+{
+ if (pcd)
+ return;
+ if (pcd->fd >= 0)
+ close(pcd->fd);
+ free(pcd->user);
+ free(pcd->config_file);
+ free(pcd->key_file);
+ free(pcd);
+}
+
+int client_parse_config(int argc, char *argv[],
+ struct private_client_data **pcd_ptr)
+{
+ char *home = para_homedir();
+ struct stat statbuf;
+ int ret;
+ struct private_client_data *pcd =
+ para_calloc(sizeof(struct private_client_data));
+
+ pcd->fd = -1;
+ cmdline_parser(argc, argv, &pcd->conf);
+ ret = - E_CLIENT_SYNTAX;
+ if (!pcd->conf.inputs_num)
+ goto out;
+ pcd->user = pcd->conf.user_given?
+ para_strdup(pcd->conf.user_arg) : para_logname();
+
+ pcd->key_file = pcd->conf.key_file_given?
+ para_strdup(pcd->conf.key_file_arg) :
+ make_message("%s/.paraslash/key.%s", home, pcd->user);
+
+ pcd->config_file = pcd->conf.config_file_given?
+ para_strdup(pcd->conf.config_file_arg) :
+ make_message("%s/.paraslash/client.conf", home);
+ ret = stat(pcd->config_file, &statbuf);
+ if (ret && pcd->conf.config_file_given) {
+ ret = -E_NO_CONFIG;
+ goto out;
+ }
+ if (!ret)
+ cmdline_parser_configfile(pcd->config_file, &pcd->conf, 0, 0, 0);
+ ret = 1;
+ *pcd_ptr = pcd;
+ PARA_INFO_LOG(
+ "current loglevel: %d\n"
+ "using config_file: %s\n"
+ "using key_file: %s\n"
+ "connecting to %s:%d\n" ,
+ pcd->conf.loglevel_arg,
+ pcd->config_file,
+ pcd->key_file,
+ pcd->conf.hostname_arg, pcd->conf.server_port_arg
+ );
+out:
+ free(home);
+ if (ret < 0)
+ client_close(pcd);
+ return ret;
+}
+
+void client_pre_select(struct sched *s, struct task *t)
+{
+ struct private_client_data *pcd = t->private_data;
+
+ PARA_INFO_LOG("status %d\n", pcd->status);
+ t->ret = 1;
+ pcd->check_r = 0;
+ pcd->check_w = 0;
+ if (pcd->fd < 0)
+ return;
+ switch (pcd->status) {
+ case CL_CONNECTED:
+ case CL_SENT_AUTH:
+ case CL_SENT_CH_RESPONSE:
+ case CL_SENT_COMMAND:
+ para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
+ pcd->check_r = 1;
+ return;
+
+ case CL_RECEIVED_WELCOME:
+ case CL_RECEIVED_CHALLENGE:
+ case CL_RECEIVED_PROCEED:
+ para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
+ pcd->check_w = 1;
+ return;
+
+ case CL_RECEIVING_SERVER_OUTPUT:
+ if (pcd->loaded < CLIENT_BUFSIZE - 1) {
+ para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
+ pcd->check_r = 1;
+ }
+ return;
+ case CL_SENDING_STDIN:
+ if (*pcd->in_loaded) {
+ PARA_INFO_LOG("loaded: %d\n", *pcd->in_loaded);
+ para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
+ pcd->check_w = 1;
+ } else {
+ if (*pcd->in_eof) {
+ t->ret = -E_INPUT_EOF;
+ s->timeout.tv_sec = 0;
+ s->timeout.tv_usec = 1;
+ }
+ }
+ return;
+ }
+}
+
+static ssize_t client_recv_buffer(struct private_client_data *pcd)
+{
+ ssize_t ret = recv_buffer(pcd->fd, pcd->buf + pcd->loaded,
+ CLIENT_BUFSIZE - pcd->loaded);
+ if (!ret)
+ return -E_SERVER_EOF;
+ if (ret > 0)
+ pcd->loaded += ret;
+ return ret;
+
+}
+
+void client_post_select(struct sched *s, struct task *t)
+{
+ struct private_client_data *pcd = t->private_data;
+
+ PARA_INFO_LOG("status %d\n", pcd->status);
+ t->ret = 1;
+ if (pcd->fd < 0)
+ return;
+ if (!pcd->check_r && !pcd->check_w)
+ return;
+ if (pcd->check_r && !FD_ISSET(pcd->fd, &s->rfds))
+ return;
+ if (pcd->check_w && !FD_ISSET(pcd->fd, &s->wfds))
+ return;
+ switch (pcd->status) {
+ case CL_CONNECTED: /* receive welcome message */
+ t->ret = client_recv_buffer(pcd);
+ if (t->ret > 0)
+ pcd->status = CL_RECEIVED_WELCOME;
+ return;
+ case CL_RECEIVED_WELCOME: /* send auth command */
+ sprintf(pcd->buf, "auth %s%s", pcd->conf.plain_given?
+ "" : "rc4 ", pcd->user);
+ PARA_INFO_LOG("--> %s\n", pcd->buf);
+ t->ret = send_buffer(pcd->fd, pcd->buf);
+ if (t->ret >= 0)
+ pcd->status = CL_SENT_AUTH;
+ return;
+ case CL_SENT_AUTH: /* receive challenge number */
+ pcd->loaded = 0;
+ t->ret = client_recv_buffer(pcd);
+ if (t->ret < 0)
+ return;
+ if (t->ret != 64) {
+ t->ret = -E_INVALID_CHALLENGE;
+ PARA_ERROR_LOG("received the following: %s\n", pcd->buf);
+ return;
+ }
+ PARA_INFO_LOG("%s", "<-- [challenge]\n");
+ /* decrypt challenge number */
+ t->ret = para_decrypt_challenge(pcd->key_file, &pcd->challenge_nr,
+ (unsigned char *) pcd->buf, 64);
+ if (t->ret > 0)
+ pcd->status = CL_RECEIVED_CHALLENGE;
+ return;
+ case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
+ PARA_INFO_LOG("--> %lu\n", pcd->challenge_nr);
+ t->ret = send_va_buffer(pcd->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
+ pcd->challenge_nr);
+ if (t->ret > 0)
+ pcd->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] = "";
+ pcd->loaded = 0;
+ t->ret = client_recv_buffer(pcd);
+ if (t->ret < 0)
+ return;
+ bytes_received = t->ret;
+ PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
+ "info ++++\n", pcd->buf);
+ /* check if server has sent "Proceed" message */
+ t->ret = -E_CLIENT_AUTH;
+ if (!strstr(pcd->buf, PROCEED_MSG))
+ return;
+ t->ret = 1;
+ pcd->status = CL_RECEIVED_PROCEED;
+ if (bytes_received < PROCEED_MSG_LEN + 32)
+ return;
+ PARA_INFO_LOG("%s", "decrypting session key\n");
+ t->ret = para_decrypt_buffer(pcd->key_file, rc4_buf,
+ (unsigned char *)pcd->buf + PROCEED_MSG_LEN + 1,
+ bytes_received - PROCEED_MSG_LEN - 1);
+ if (t->ret < 0)
+ return;
+ RC4_set_key(&pcd->rc4_send_key, RC4_KEY_LEN, rc4_buf);
+ RC4_set_key(&pcd->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
+ enable_crypt(pcd->fd, rc4_recv, rc4_send, pcd);
+ }
+ case CL_RECEIVED_PROCEED: /* concat args and send command */
+ {
+ int i;
+ char *command = NULL;
+ for (i = 0; i < pcd->conf.inputs_num; i++) {
+ char *tmp = command;
+ command = make_message("%s\n%s", command?
+ command : "", pcd->conf.inputs[i]);
+ free(tmp);
+ }
+ command = para_strcat(command, EOC_MSG "\n");
+ PARA_INFO_LOG("--> %s\n", command);
+ t->ret = send_buffer(pcd->fd, command);
+ free(command);
+ if (t->ret > 0)
+ pcd->status = CL_SENT_COMMAND;
+ return;
+ }
+ case CL_SENT_COMMAND:
+ pcd->loaded = 0;
+ t->ret = client_recv_buffer(pcd);
+ if (t->ret < 0)
+ return;
+ t->ret = -E_HANDSHAKE_COMPLETE;
+ if (strstr(pcd->buf, AWAITING_DATA_MSG))
+ pcd->status = CL_SENDING_STDIN;
+ else
+ pcd->status = CL_RECEIVING_SERVER_OUTPUT;
+ return;
+ case CL_SENDING_STDIN: /* FIXME: might block */
+ PARA_INFO_LOG("loaded: %d\n", *pcd->in_loaded);
+ t->ret = send_bin_buffer(pcd->fd, pcd->inbuf, *pcd->in_loaded);
+ if (t->ret <= 0) {
+ if (!t->ret)
+ t->ret = 1;
+ return;
+ }
+ *pcd->in_loaded = 0; /* FIXME: short writes */
+ return;
+ case CL_RECEIVING_SERVER_OUTPUT:
+ t->ret = client_recv_buffer(pcd);
+ return;
+ }
+
+}
+
+int client_open(struct private_client_data *pcd)
+{
+ int ret;
+ struct hostent *he;
+ struct sockaddr_in their_addr;
+
+ /* get the host info */
+ PARA_NOTICE_LOG("getting host info of %s\n",
+ pcd->conf.hostname_arg);
+ ret = get_host_info(pcd->conf.hostname_arg, &he);
+ if (ret < 0)
+ goto out;
+ /* get new socket */
+ ret = get_socket();
+ if (ret < 0)
+ goto out;
+ pcd->fd = ret;
+ /* init their_addr */
+ init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
+ /* connect */
+ PARA_NOTICE_LOG("connecting to %s\n", pcd->conf.hostname_arg);
+ ret = para_connect(pcd->fd, &their_addr);
+ if (ret < 0)
+ goto out;
+ pcd->status = CL_CONNECTED;
+ pcd->task.pre_select = client_pre_select;
+ pcd->task.post_select = client_post_select;
+ pcd->task.private_data = pcd;
+ sprintf(pcd->task.status, "client");
+ register_task(&pcd->task);
+ ret = 1;
+out:
+ return ret;
+}