/* BEGIN_ICS_COPYRIGHT2 ****************************************
Copyright (c) 2015-2020, Intel Corporation
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Intel Corporation nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ** END_ICS_COPYRIGHT2 ****************************************/
#ifdef __LINUX__
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifdef __VXWORKS__
#include <sockLib.h>
#endif
#include <sys/un.h>
#include <sys/stat.h>
#include <signal.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <libgen.h>
#include <errno.h>
#include "imemory.h"
#include "hsm_com_srvr_api.h"
#include "hsm_com_srvr_data.h"
int hsm_com_dbg = 0;
int unix_serv_listen(char *name)
{
int fd,len;
struct sockaddr_un socketaddr;
char *dname, *namecpy = strdup(name);
//check strdup call completed successfully
if (!namecpy)
{
fd = -HSM_COM_NO_MEM;
goto error;
}
unlink(name);
//ensure socket directory exists
dname = dirname(namecpy);
if (mkdir(dname, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0)
{
if (errno != EEXIST)
{
fd = -HSM_COM_PATH_ERR;
goto error;
}
}
if((fd = socket(AF_UNIX,SOCK_STREAM,0)) < 0)
{
fd = -HSM_COM_SOCK_ERR;
goto error;
}
memset(&socketaddr,0,sizeof(socketaddr));
socketaddr.sun_family = AF_UNIX;
StringCopy(socketaddr.sun_path,name,sizeof(socketaddr.sun_path));
len = SUN_LEN(&socketaddr);
if(bind(fd,(struct sockaddr*)&socketaddr,len) < 0)
{
close(fd);
fd = -HSM_COM_BIND_ERR;
goto error;
}
if(listen(fd,5) < 0)
{
close(fd);
fd = -HSM_COM_LISTEN_ERR;
goto error;
}
error:
if (namecpy) free(namecpy);
return fd;
}
int
unix_serv_accept(int listenfd, uid_t *uidptr)
{
int clifd, len;
time_t staletime;
struct sockaddr_un unix_addr;
struct stat statbuf;
len = sizeof(unix_addr);
if((clifd = accept(listenfd,(struct sockaddr *)&unix_addr,(socklen_t *)&len)) < 0)
{
return(-1);
}
len -= sizeof(unix_addr.sun_family);
unix_addr.sun_path[len] = 0;
if (stat(unix_addr.sun_path,&statbuf) < 0)
{
close(clifd);
return(-2);
}
#ifdef S_ISSOCK
if (S_ISSOCK(statbuf.st_mode) == 0)
{
close(clifd);
return(-3);
}
#endif
if ((statbuf.st_mode & (S_IRWXG | S_IRWXO)) ||
(statbuf.st_mode & S_IRWXU) != S_IRWXU)
{
close(clifd);
return(-4);
}
staletime = time(NULL) - HSM_COM_STALE_CNX;
if (statbuf.st_atime < staletime ||
statbuf.st_ctime < staletime ||
statbuf.st_mtime < staletime)
{
close(clifd);
return(-5);
}
if(uidptr != NULL)
*uidptr = statbuf.st_uid;
unlink(unix_addr.sun_path);
return clifd;
}
int
add_client(hsm_com_client_t *clist, int size, int serv_fd)
{
int i;
for(i=0;i<size;i++)
{
if(clist[i].fd < 0){
if((clist[i].fd = unix_serv_accept(serv_fd, (void *)&clist[i].uid)) > 0){
if(hsm_com_dbg)
printf("Received new connection: fd: %d uid: %d\n",clist[i].fd,(int)clist[i].uid);
return(clist[i].fd);
}
}
}
return(-1);
}
hsm_com_errno_t
send_response(hsm_com_client_t *client, hsm_com_msg_t *msg)
{
int len;
if(!msg)
{
return HSM_COM_BAD;
}
len = sizeof(hsm_com_common_t) + msg->common.payload_len;
if(client->state != HSM_COM_C_STATE_CT)
{
return HSM_COM_ERR_DISC;
}
/*
if(len > HSM_COM_MAX_DATA)
{
// Data exceeds our maximum packet size...
return HSM_COM_BAD;
}
*/
if(hsm_com_dbg)
printf("responding with %d bytes\n",len);
if(write(client->fd, msg, len) != len)
{
return HSM_COM_ERR_DISC;
}
return HSM_COM_OK;
}
void
dump_request(hsm_com_common_t *header)
{
printf("DUMP:\n");
printf("\tCMD: %lu\n",header->cmd);
printf("\tLEN: %lu\n",header->payload_len);
printf("\tRSP: %d\n",header->resp_code);
printf("\tVER: %d\n",header->ver);
printf("\tTID: %lu\n",header->trans_id);
printf("\n\n");
}
hsm_com_errno_t
process_request(char *buf, int buflen, hsm_com_callback_func cb, hsm_com_client_t *client)
{
hsm_com_msg_t msg;
hsm_com_con_data_t *con_data;
hsm_com_errno_t res = HSM_COM_OK;
hsm_com_common_t header;
hsm_com_datagram_t send_datagram;
hsm_com_msg_t *data_msg;
if(buflen < sizeof(header)){
return HSM_COM_ERR_LEN;
}
memcpy(&header,buf,sizeof(header));
if(hsm_com_dbg)
dump_request(&header);
if(header.ver != HSM_COM_VER)
{
return HSM_COM_ERR_VERSION;
}
switch(header.cmd){
case HSM_COM_CMD_CONN:
if(hsm_com_dbg)
printf("Processing connect command\n");
con_data = (hsm_com_con_data_t*)buf;
if(con_data->header.payload_len != (sizeof(con_data->key))){
con_data->header.resp_code = HSM_COM_RESP_INV_LEN;
con_data->header.payload_len = 0;
// GOTO: Send response.
}
if(con_data->key != HSM_COM_KEY)
{
// Drop client...
return HSM_COM_ERR_DISC;
}
else
{
client->state = HSM_COM_C_STATE_CT;
con_data->header.resp_code = HSM_COM_RESP_OK;
if((res = send_response(client, (hsm_com_msg_t*)con_data)) != HSM_COM_OK)
{
if(hsm_com_dbg)
printf("Failed to send connect resp, code: %d\n", res);
}
}
break;
case HSM_COM_CMD_DISC:
if(client->state != HSM_COM_C_STATE_CT){
return HSM_COM_ERR_DISC;
}
// Send the response.
msg.common.resp_code = HSM_COM_RESP_OK;
msg.common.payload_len = 0;
if((res = send_response(client, &msg)) != HSM_COM_OK)
{
if(hsm_com_dbg)
printf("Failed to send disconnect resp, code: %d\n", res);
}
// Note: The client is supposed to be the one to close the socket once
// it gets the response.
break;
case HSM_COM_CMD_PING:
if(client->state != HSM_COM_C_STATE_CT){
return HSM_COM_ERR_DISC;
}
// Send the response.
msg.common.resp_code = HSM_COM_RESP_OK;
msg.common.payload_len = 0;
if((res = send_response(client, &msg)) != HSM_COM_OK)
{
if(hsm_com_dbg)
printf("Failed to send ping resp, code: %d\n", res);
}
break;
case HSM_COM_CMD_DATA:
if(client->state != HSM_COM_C_STATE_CT){
return HSM_COM_ERR_DISC;
}
data_msg = (hsm_com_msg_t*)buf;
send_datagram.buf = &data_msg->data[0];
send_datagram.data_len = data_msg->common.payload_len;
// Note: Here we only allow the responses to be as big as what we received.
send_datagram.buf_size = send_datagram.data_len;
if(cb){
if(cb(&send_datagram) == HSM_COM_OK){
data_msg->common.payload_len = send_datagram.data_len;
data_msg->common.resp_code = HSM_COM_RESP_OK;
if((res = send_response(client, data_msg)) != HSM_COM_OK)
{
if(hsm_com_dbg)
printf("Failed to send data resp, code: %d\n", res);
}
}
}
break;
}
return res;
}
hsm_com_errno_t
unix_sck_run_server(hsm_com_server_hdl_t *hdl)
{
int i, n, maxfd, listenfd, clifd, nread;
fd_set rset, allset;
int offset;
hsm_com_errno_t res;
FD_ZERO(&allset);
for(i=0;i<hdl->max_conx;i++){
hdl->client_list[i].fd = -1;
}
if((listenfd = unix_serv_listen(hdl->path)) < 0)
{
if(hsm_com_dbg)
printf("Error creating server socket\n");
return(listenfd);
}
FD_SET(listenfd,&allset);
maxfd = listenfd;
for( ; ; )
{
rset = allset;
if ( (n = select(maxfd + 1,&rset,NULL,NULL,NULL)) < 0)
if(hsm_com_dbg)
printf("unix_sck_run_server: Select error: %d \n",n);
if (FD_ISSET(listenfd, &rset))
{
// Accept a new connection
if((clifd = add_client(&hdl->client_list[0], HSM_COM_MAX_CLIENTS, listenfd)) < 0){
if(hsm_com_dbg)
printf("Failed to add new client\n");
}else{
FD_SET(clifd,&allset);
if(clifd > maxfd)
maxfd = clifd;
continue;
}
}
for(i=0;i<hdl->max_conx;i++)
{
if(hdl->client_list[i].fd < 0)
continue;
if(FD_ISSET(hdl->client_list[i].fd,&rset))
{
if ( (nread = unix_sck_read_data(hdl->client_list[i].fd,
&hdl->client_list[i].scr,
hdl->recv_buf,
hdl->buf_len,
&offset)) == 0)
{
FD_CLR(hdl->client_list[i].fd,&allset);
close(hdl->client_list[i].fd);
hdl->client_list[i].fd = -1;
hdl->client_list[i].uid = 0;
hdl->client_list[i].scr.scratch_fill = 0;
}
else if(nread < 0)
{
if(hsm_com_dbg)
printf("Skipping since we need more data\n");
}
else
{
if(hsm_com_dbg)
printf("Got %d bytes (%d)\n",nread,offset);
res = process_request(&hdl->recv_buf[offset], nread,
hdl->callback, &hdl->client_list[i]);
if(hsm_com_dbg)
printf("Process result: %d\n",res);
if(res == HSM_COM_ERR_DISC){
// Disconnect the client...
FD_CLR(hdl->client_list[i].fd,&allset);
close(hdl->client_list[i].fd);
hdl->client_list[i].fd = -1;
hdl->client_list[i].uid = 0;
hdl->client_list[i].scr.scratch_fill = 0;
}
}
}
}
}
return 0;
}
#endif