mirrors/Bochs
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
e14f70088c
Bochs/bochs/iodev/network/netutil.cc
Volker Ruppert 17abf11e85 Check requested maximum DHCP message size and report if invalid (networking 
modules vnet / socket only).
2017-06-18 15:54:54 +00:00

872 lines
25 KiB
C++
Raw Blame History

/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2004-2017 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
//
// netutil.cc - shared code for eth_vnet.cc and bxhub.cc
#define BX_PLUGGABLE
#ifdef BXHUB
#include "config.h"
#else
#include "iodev.h"
#endif
#if BX_NETWORKING
#include "netmod.h"
#include "netutil.h"
#ifdef BXHUB
#include "misc/bxcompat.h"
#else
#define LOG_THIS netdev->
#endif
Bit16u ip_checksum(const Bit8u *buf, unsigned buf_len)
{
Bit32u sum = 0;
unsigned n;
for (n = 0; n < buf_len; n++) {
if (n & 1) {
sum += (Bit32u)(*buf++);
} else {
sum += (Bit32u)(*buf++) << 8;
}
}
while (sum > 0xffff) {
sum = (sum >> 16) + (sum & 0xffff);
}
return (Bit16u)sum;
}
// DHCP server
#define BOOTREQUEST 1
#define BOOTREPLY 2
#define BOOTPOPT_PADDING 0
#define BOOTPOPT_END 255
#define BOOTPOPT_SUBNETMASK 1
#define BOOTPOPT_TIMEOFFSET 2
#define BOOTPOPT_ROUTER_OPTION 3
#define BOOTPOPT_DOMAIN_NAMESERVER 6
#define BOOTPOPT_HOST_NAME 12
#define BOOTPOPT_DOMAIN_NAME 15
#define BOOTPOPT_MAX_DATAGRAM_SIZE 22
#define BOOTPOPT_DEFAULT_IP_TTL 23
#define BOOTPOPT_BROADCAST_ADDRESS 28
#define BOOTPOPT_ARPCACHE_TIMEOUT 35
#define BOOTPOPT_DEFAULT_TCP_TTL 37
#define BOOTPOPT_NTP_SERVER 42
#define BOOTPOPT_NETBIOS_NAMESERVER 44
#define BOOTPOPT_X_FONTSERVER 48
#define BOOTPOPT_REQUESTED_IP_ADDRESS 50
#define BOOTPOPT_IP_ADDRESS_LEASE_TIME 51
#define BOOTPOPT_OPTION_OVRLOAD 52
#define BOOTPOPT_DHCP_MESSAGETYPE 53
#define BOOTPOPT_SERVER_IDENTIFIER 54
#define BOOTPOPT_PARAMETER_REQUEST_LIST 55
#define BOOTPOPT_MAX_DHCP_MESSAGE_SIZE 57
#define BOOTPOPT_RENEWAL_TIME 58
#define BOOTPOPT_REBINDING_TIME 59
#define BOOTPOPT_CLASS_IDENTIFIER 60
#define BOOTPOPT_CLIENT_IDENTIFIER 61
#define DHCPDISCOVER 1
#define DHCPOFFER 2
#define DHCPREQUEST 3
#define DHCPDECLINE 4
#define DHCPACK 5
#define DHCPNAK 6
#define DHCPRELEASE 7
#define DHCPINFORM 8
#define DEFAULT_LEASE_TIME 28800
// TFTP server support by EaseWay <easeway@123.com>
#define TFTP_RRQ 1
#define TFTP_WRQ 2
#define TFTP_DATA 3
#define TFTP_ACK 4
#define TFTP_ERROR 5
#define TFTP_OPTACK 6
#define TFTP_OPTION_OCTET 0x1
#define TFTP_OPTION_BLKSIZE 0x2
#define TFTP_OPTION_TSIZE 0x4
#define TFTP_OPTION_TIMEOUT 0x8
#define TFTP_DEFAULT_BLKSIZE 512
#define TFTP_DEFAULT_TIMEOUT 5
static const Bit8u subnetmask_ipv4addr[4] = {0xff,0xff,0xff,0x00};
static const Bit8u broadcast_ipv4addr1[4] = {0xff,0xff,0xff,0xff};
void vnet_prepare_reply(Bit8u *replybuf, unsigned l3type, dhcp_cfg_t *dhcpc)
{
ethernet_header_t *ethhdr = (ethernet_header_t *)replybuf;
memcpy(ethhdr->dst_mac_addr, dhcpc->guest_macaddr, ETHERNET_MAC_ADDR_LEN);
memcpy(ethhdr->src_mac_addr, dhcpc->host_macaddr, ETHERNET_MAC_ADDR_LEN);
put_net2((Bit8u*)&ethhdr->type, l3type);
}
bx_bool vnet_process_arp_request(const Bit8u *buf, Bit8u *reply, dhcp_cfg_t *dhcp)
{
arp_header_t *arprhdr = (arp_header_t *)(reply + sizeof(ethernet_header_t));
if (!memcmp(&buf[22], dhcp->guest_macaddr, 6)) {
memcpy(dhcp->guest_ipv4addr, &buf[28], 4);
if (!memcmp(&buf[38], dhcp->host_ipv4addr, 4) ||
((dhcp->dns_ipv4addr[0] != 0) &&
!memcmp(&buf[38], dhcp->dns_ipv4addr, 4))) {
memset(reply, 0, MIN_RX_PACKET_LEN);
memcpy(arprhdr, &buf[14], 6);
put_net2((Bit8u*)&arprhdr->opcode, ARP_OPCODE_REPLY);
memcpy((Bit8u *)arprhdr+8, dhcp->host_macaddr, ETHERNET_MAC_ADDR_LEN);
memcpy((Bit8u *)arprhdr+14, &buf[38], 4);
memcpy((Bit8u *)arprhdr+18, dhcp->guest_macaddr, ETHERNET_MAC_ADDR_LEN);
memcpy((Bit8u *)arprhdr+24, dhcp->guest_ipv4addr, 4);
return 1;
}
}
return 0;
}
bx_bool vnet_process_icmp_echo(const Bit8u *l3pkt, unsigned l3header_len,
const Bit8u *l4pkt, unsigned l4pkt_len,
Bit8u *reply)
{
if ((14U+l3header_len+l4pkt_len) > ICMP_ECHO_PACKET_MAX) {
return 0;
}
memcpy(&reply[14], l3pkt, l3header_len);
memcpy(&reply[14+l3header_len], l4pkt, l4pkt_len);
reply[14+l3header_len+0] = 0x00; // echo reply
put_net2(&reply[14+l3header_len+2],0);
put_net2(&reply[14+l3header_len+2],
ip_checksum(&reply[14+l3header_len],l4pkt_len) ^ (Bit16u)0xffff);
return 1;
}
int vnet_process_dhcp(bx_devmodel_c *netdev, const Bit8u *data, unsigned data_len, Bit8u *reply, dhcp_cfg_t *dhcp)
{
const Bit8u *opts;
unsigned opts_len;
unsigned extcode;
unsigned extlen;
const Bit8u *extdata;
unsigned dhcpmsgtype = 0;
bx_bool found_serverid = false;
bx_bool found_leasetime = false;
bx_bool found_guest_ipaddr = false;
bx_bool found_host_name = false;
Bit32u leasetime = BX_MAX_BIT32U;
const Bit8u *dhcpreqparams = NULL;
unsigned dhcpreqparams_len = 0;
Bit8u dhcpreqparam_default[8];
bx_bool dhcpreqparam_default_validflag = false;
unsigned dhcpreqparams_default_len = 0;
Bit8u *replyopts;
Bit8u replybuf[576];
char *hostname = NULL;
unsigned hostname_len = 0;
Bit16u maxsize = 0;
if (data_len < (236U+4U)) return 0;
if (data[0] != BOOTREQUEST) return 0;
if (data[1] != 1 || data[2] != 6) return 0;
if (memcmp(&data[28U], dhcp->guest_macaddr, 6)) return 0;
if (data[236] != 0x63 || data[237] != 0x82 ||
data[238] != 0x53 || data[239] != 0x63) return 0;
opts = &data[240];
opts_len = data_len - 240U;
while (1) {
if (opts_len < 1) {
BX_ERROR(("dhcp: invalid request"));
return 0;
}
extcode = *opts++;
opts_len--;
if (extcode == BOOTPOPT_PADDING) continue;
if (extcode == BOOTPOPT_END) break;
if (opts_len < 1) {
BX_ERROR(("dhcp: invalid request"));
return 0;
}
extlen = *opts++;
opts_len--;
if (opts_len < extlen) {
BX_ERROR(("dhcp: invalid request"));
return 0;
}
extdata = opts;
opts += extlen;
opts_len -= extlen;
switch (extcode)
{
case BOOTPOPT_DHCP_MESSAGETYPE:
if (extlen != 1)
break;
dhcpmsgtype = *extdata;
break;
case BOOTPOPT_PARAMETER_REQUEST_LIST:
if (extlen < 1)
break;
dhcpreqparams = extdata;
dhcpreqparams_len = extlen;
break;
case BOOTPOPT_SERVER_IDENTIFIER:
if (extlen != 4)
break;
if (memcmp(extdata, dhcp->host_ipv4addr, 4)) {
BX_INFO(("dhcp: request to another server"));
return 0;
}
found_serverid = true;
break;
case BOOTPOPT_IP_ADDRESS_LEASE_TIME:
if (extlen != 4)
break;
leasetime = get_net4(&extdata[0]);
found_leasetime = true;
break;
case BOOTPOPT_REQUESTED_IP_ADDRESS:
if (extlen != 4)
break;
if (!memcmp(extdata, dhcp->default_guest_ipv4addr,4)) {
found_guest_ipaddr = true;
memcpy(dhcp->guest_ipv4addr, dhcp->default_guest_ipv4addr, 4);
}
break;
case BOOTPOPT_HOST_NAME:
if (extlen < 1)
break;
hostname = (char*)malloc(extlen);
memcpy(hostname, extdata, extlen);
hostname_len = extlen;
if ((dhcp->hostname != NULL) && (extlen < 256)) {
memcpy(dhcp->hostname, extdata, extlen);
dhcp->hostname[extlen] = 0;
}
found_host_name = true;
break;
case BOOTPOPT_MAX_DHCP_MESSAGE_SIZE:
if (extlen < 2)
break;
maxsize = get_net2(&extdata[0]);
if (maxsize < 548U) {
BX_ERROR(("invalid max. DHCP message size = %d", maxsize));
}
break;
default:
BX_ERROR(("extcode %d not supported yet", extcode));
break;
}
}
memset(&dhcpreqparam_default,0,sizeof(dhcpreqparam_default));
memset(&replybuf[0],0,sizeof(replybuf));
replybuf[0] = BOOTREPLY;
replybuf[1] = 1;
replybuf[2] = 6;
memcpy(&replybuf[4],&data[4],4);
memcpy(&replybuf[16], dhcp->default_guest_ipv4addr, 4);
memcpy(&replybuf[20], dhcp->host_ipv4addr, 4);
memcpy(&replybuf[28],&data[28],6);
memcpy(&replybuf[44],"vnet",4);
memcpy(&replybuf[108],"pxelinux.0",10);
replybuf[236] = 0x63;
replybuf[237] = 0x82;
replybuf[238] = 0x53;
replybuf[239] = 0x63;
replyopts = &replybuf[240];
opts_len = sizeof(replybuf)/sizeof(replybuf[0])-240;
switch (dhcpmsgtype) {
case DHCPDISCOVER:
BX_DEBUG(("dhcp server: DHCPDISCOVER"));
// reset guest address; answer must be broadcasted to unconfigured IP
memcpy(dhcp->guest_ipv4addr, broadcast_ipv4addr1, 4);
*replyopts ++ = BOOTPOPT_DHCP_MESSAGETYPE;
*replyopts ++ = 1;
*replyopts ++ = DHCPOFFER;
opts_len -= 3;
dhcpreqparam_default[0] = BOOTPOPT_IP_ADDRESS_LEASE_TIME;
dhcpreqparam_default[1] = BOOTPOPT_SERVER_IDENTIFIER;
if (found_host_name) {
dhcpreqparam_default[2] = BOOTPOPT_HOST_NAME;
}
dhcpreqparam_default_validflag = true;
break;
case DHCPREQUEST:
BX_DEBUG(("dhcp server: DHCPREQUEST"));
// check ciaddr.
if (found_serverid || found_guest_ipaddr || (!memcmp(&data[12], dhcp->default_guest_ipv4addr, 4))) {
*replyopts ++ = BOOTPOPT_DHCP_MESSAGETYPE;
*replyopts ++ = 1;
*replyopts ++ = DHCPACK;
opts_len -= 3;
dhcpreqparam_default[0] = BOOTPOPT_IP_ADDRESS_LEASE_TIME;
if (!found_serverid) {
dhcpreqparam_default[1] = BOOTPOPT_SERVER_IDENTIFIER;
}
dhcpreqparam_default_validflag = true;
} else {
*replyopts ++ = BOOTPOPT_DHCP_MESSAGETYPE;
*replyopts ++ = 1;
*replyopts ++ = DHCPNAK;
opts_len -= 3;
if (found_leasetime) {
dhcpreqparam_default[dhcpreqparams_default_len++] = BOOTPOPT_IP_ADDRESS_LEASE_TIME;
dhcpreqparam_default_validflag = true;
}
if (!found_serverid) {
dhcpreqparam_default[dhcpreqparams_default_len++] = BOOTPOPT_SERVER_IDENTIFIER;
dhcpreqparam_default_validflag = true;
}
}
break;
default:
BX_ERROR(("dhcp server: unsupported message type %u",dhcpmsgtype));
return 0;
}
while (1) {
while (dhcpreqparams_len-- > 0) {
switch (*dhcpreqparams++) {
case BOOTPOPT_SUBNETMASK:
BX_DEBUG(("provide BOOTPOPT_SUBNETMASK"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_SUBNETMASK;
*replyopts ++ = 4;
memcpy(replyopts,subnetmask_ipv4addr,4);
replyopts += 4;
break;
case BOOTPOPT_ROUTER_OPTION:
BX_DEBUG(("provide BOOTPOPT_ROUTER_OPTION"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_ROUTER_OPTION;
*replyopts ++ = 4;
memcpy(replyopts, dhcp->host_ipv4addr, 4);
replyopts += 4;
break;
case BOOTPOPT_DOMAIN_NAMESERVER:
if (dhcp->dns_ipv4addr[0] != 0) {
BX_DEBUG(("provide BOOTPOPT_DOMAIN_NAMESERVER"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_DOMAIN_NAMESERVER;
*replyopts ++ = 4;
memcpy(replyopts, dhcp->dns_ipv4addr, 4);
replyopts += 4;
}
break;
case BOOTPOPT_BROADCAST_ADDRESS:
BX_DEBUG(("provide BOOTPOPT_BROADCAST_ADDRESS"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_BROADCAST_ADDRESS;
*replyopts ++ = 4;
memcpy(replyopts, dhcp->host_ipv4addr, 3);
replyopts += 3;
*replyopts ++ = 0xff;
break;
case BOOTPOPT_IP_ADDRESS_LEASE_TIME:
BX_DEBUG(("provide BOOTPOPT_IP_ADDRESS_LEASE_TIME"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_IP_ADDRESS_LEASE_TIME;
*replyopts ++ = 4;
if (leasetime < DEFAULT_LEASE_TIME) {
put_net4(replyopts, leasetime);
} else {
put_net4(replyopts, DEFAULT_LEASE_TIME);
}
replyopts += 4;
break;
case BOOTPOPT_SERVER_IDENTIFIER:
BX_DEBUG(("provide BOOTPOPT_SERVER_IDENTIFIER"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_SERVER_IDENTIFIER;
*replyopts ++ = 4;
memcpy(replyopts, dhcp->host_ipv4addr,4);
replyopts += 4;
break;
case BOOTPOPT_RENEWAL_TIME:
BX_DEBUG(("provide BOOTPOPT_RENEWAL_TIME"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_RENEWAL_TIME;
*replyopts ++ = 4;
put_net4(replyopts, 600);
replyopts += 4;
break;
case BOOTPOPT_REBINDING_TIME:
BX_DEBUG(("provide BOOTPOPT_REBINDING_TIME"));
if (opts_len < 6) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 6;
*replyopts ++ = BOOTPOPT_REBINDING_TIME;
*replyopts ++ = 4;
put_net4(replyopts, 1800);
replyopts += 4;
break;
case BOOTPOPT_HOST_NAME:
if (hostname != NULL) {
BX_DEBUG(("provide BOOTPOPT_HOST_NAME"));
if (opts_len < (hostname_len + 2)) {
free(hostname);
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= (hostname_len + 2);
*replyopts ++ = BOOTPOPT_HOST_NAME;
*replyopts ++ = hostname_len;
memcpy(replyopts, hostname, hostname_len);
replyopts += hostname_len;
free(hostname);
hostname = NULL;
break;
}
default:
if (*(dhcpreqparams-1) != 0) {
BX_ERROR(("dhcp server: requested parameter %u not supported yet",*(dhcpreqparams-1)));
}
break;
}
}
if (!dhcpreqparam_default_validflag) break;
dhcpreqparams = &dhcpreqparam_default[0];
dhcpreqparams_len = sizeof(dhcpreqparam_default);
dhcpreqparam_default_validflag = false;
}
if (opts_len < 1) {
BX_ERROR(("option buffer is insufficient"));
return 0;
}
opts_len -= 2;
*replyopts ++ = BOOTPOPT_END;
opts_len = replyopts - &replybuf[0];
if (opts_len < (236U+64U)) {
opts_len = (236U+64U); // BOOTP
}
if (opts_len < (548U)) {
opts_len = 548U; // DHCP
}
memcpy(reply, replybuf, opts_len);
return opts_len;
}
// TFTP support
typedef struct tftp_session {
char filename[BX_PATHNAME_LEN];
Bit16u tid;
bx_bool write;
unsigned options;
size_t tsize_val;
unsigned blksize_val;
unsigned timeout_val;
unsigned timestamp;
struct tftp_session *next;
} tftp_session_t;
tftp_session_t *tftp_sessions = NULL;
tftp_session_t *tftp_new_session(Bit16u req_tid, bx_bool mode, const char *tpath, const char *tname)
{
tftp_session_t *s = new tftp_session_t;
s->tid = req_tid;
s->write = mode;
s->options = 0;
s->blksize_val = TFTP_DEFAULT_BLKSIZE;
s->timeout_val = TFTP_DEFAULT_TIMEOUT;
s->next = tftp_sessions;
tftp_sessions = s;
if ((strlen(tname) > 0) && ((strlen(tpath) + strlen(tname)) < BX_PATHNAME_LEN)) {
sprintf(s->filename, "%s/%s", tpath, tname);
} else {
s->filename[0] = 0;
}
return s;
}
tftp_session_t *tftp_find_session(Bit16u tid)
{
tftp_session_t *s = tftp_sessions;
while (s != NULL) {
if (s->tid != tid)
s = s->next;
else
break;
}
return s;
}
void tftp_remove_session(tftp_session_t *s)
{
tftp_session_t *last;
if (tftp_sessions == s) {
tftp_sessions = s->next;
} else {
last = tftp_sessions;
while (last != NULL) {
if (last->next != s)
last = last->next;
else
break;
}
if (last) {
last->next = s->next;
}
}
delete s;
}
void tftp_update_timestamp(tftp_session_t *s)
{
#ifndef BXHUB
s->timestamp = (unsigned)(bx_pc_system.time_usec() / 1000000);
#else
s->timestamp = (unsigned)time(NULL);
#endif
}
void tftp_timeout_check()
{
#ifndef BXHUB
unsigned curtime = (unsigned)(bx_pc_system.time_usec() / 1000000);
#else
unsigned curtime = (unsigned)time(NULL);
#endif
tftp_session_t *next, *s = tftp_sessions;
while (s != NULL) {
if ((curtime - s->timestamp) > s->timeout_val) {
next = s->next;
tftp_remove_session(s);
s = next;
} else {
s = s->next;
}
}
}
int tftp_send_error(Bit8u *buffer, unsigned code, const char *msg, tftp_session_t *s)
{
put_net2(buffer, TFTP_ERROR);
put_net2(buffer + 2, code);
strcpy((char*)buffer + 4, msg);
if (s != NULL) {
tftp_remove_session(s);
}
return (strlen(msg) + 5);
}
int tftp_send_data(Bit8u *buffer, unsigned block_nr, tftp_session_t *s)
{
char msg[BX_PATHNAME_LEN];
int rd;
FILE *fp = fopen(s->filename, "rb");
if (!fp) {
sprintf(msg, "File not found: %s", s->filename);
return tftp_send_error(buffer, 1, msg, s);
}
if (fseek(fp, (block_nr - 1) * s->blksize_val, SEEK_SET) < 0) {
fclose(fp);
return tftp_send_error(buffer, 3, "Block not seekable", s);
}
rd = fread(buffer + 4, 1, s->blksize_val, fp);
fclose(fp);
if (rd < 0) {
return tftp_send_error(buffer, 3, "Block not readable", s);
}
put_net2(buffer, TFTP_DATA);
put_net2(buffer + 2, block_nr);
if (rd < (int)s->blksize_val) {
tftp_remove_session(s);
} else {
tftp_update_timestamp(s);
}
return (rd + 4);
}
int tftp_send_ack(Bit8u *buffer, unsigned block_nr)
{
put_net2(buffer, TFTP_ACK);
put_net2(buffer + 2, block_nr);
return 4;
}
int tftp_send_optack(Bit8u *buffer, tftp_session_t *s)
{
Bit8u *p = buffer;
put_net2(p, TFTP_OPTACK);
p += 2;
if (s->options & TFTP_OPTION_TSIZE) {
*p++='t'; *p++='s'; *p++='i'; *p++='z'; *p++='e'; *p++='\0';
sprintf((char *)p, "%lu", (unsigned long)s->tsize_val);
p += strlen((const char *)p) + 1;
}
if (s->options & TFTP_OPTION_BLKSIZE) {
*p++='b'; *p++='l'; *p++='k'; *p++='s'; *p++='i'; *p++='z'; *p++='e'; *p++='\0';
sprintf((char *)p, "%u", s->blksize_val);
p += strlen((const char *)p) + 1;
}
if (s->options & TFTP_OPTION_TIMEOUT) {
*p++='t'; *p++='i'; *p++='m'; *p++='e'; *p++='o'; *p++='u'; *p++='t'; *p++='\0';
sprintf((char *)p, "%u", s->timeout_val);
p += strlen((const char *)p) + 1;
}
tftp_update_timestamp(s);
return (p - buffer);
}
void tftp_parse_options(bx_devmodel_c *netdev, const char *mode, const Bit8u *data,
unsigned data_len, tftp_session_t *s)
{
while (mode < (const char*)data + data_len) {
if (memcmp(mode, "octet\0", 6) == 0) {
s->options |= TFTP_OPTION_OCTET;
mode += 6;
} else if (memcmp(mode, "tsize\0", 6) == 0) {
s->options |= TFTP_OPTION_TSIZE; // size needed
mode += 6;
if (s->write) {
s->tsize_val = atoi(mode);
}
mode += strlen(mode)+1;
} else if (memcmp(mode, "blksize\0", 8) == 0) {
s->options |= TFTP_OPTION_BLKSIZE;
mode += 8;
s->blksize_val = atoi(mode);
if (s->blksize_val > TFTP_BUFFER_SIZE) {
BX_ERROR(("tftp req: blksize value %d not supported - using %d instead",
s->blksize_val, TFTP_BUFFER_SIZE));
s->blksize_val = TFTP_BUFFER_SIZE;
}
mode += strlen(mode)+1;
} else if (memcmp(mode, "timeout\0", 8) == 0) {
s->options |= TFTP_OPTION_TIMEOUT;
mode += 8;
s->timeout_val = atoi(mode);
if ((s->timeout_val < 1) || (s->timeout_val > 255)) {
BX_ERROR(("tftp req: timeout value %d not supported - using %d instead",
s->timeout_val, TFTP_DEFAULT_TIMEOUT));
s->timeout_val = TFTP_DEFAULT_TIMEOUT;
}
mode += strlen(mode)+1;
} else {
BX_ERROR(("tftp req: unknown option %s", mode));
break;
}
}
}
int vnet_process_tftp(bx_devmodel_c *netdev, const Bit8u *data, unsigned data_len, Bit16u req_tid, Bit8u *reply, const char *tftp_rootdir)
{
FILE *fp;
unsigned block_nr;
unsigned tftp_len;
tftp_session_t *s;
tftp_timeout_check();
s = tftp_find_session(req_tid);
switch (get_net2(data)) {
case TFTP_RRQ:
{
if (s != NULL) {
tftp_remove_session(s);
}
strncpy((char*)reply, (const char*)data + 2, data_len - 2);
reply[data_len - 4] = 0;
s = tftp_new_session(req_tid, 0, tftp_rootdir, (const char*)reply);
if (strlen(s->filename) == 0) {
return tftp_send_error(reply, 1, "Illegal file name", s);
}
// options
if (strlen((char*)reply) < data_len - 2) {
const char *mode = (const char*)data + 2 + strlen((char*)reply) + 1;
tftp_parse_options(netdev, mode, data, data_len, s);
}
if (!(s->options & TFTP_OPTION_OCTET)) {
return tftp_send_error(reply, 4, "Unsupported transfer mode", NULL);
}
if (s->options & TFTP_OPTION_TSIZE) {
struct stat stbuf;
if (stat(s->filename, &stbuf) < 0) {
s->options &= ~TFTP_OPTION_TSIZE;
} else {
s->tsize_val = (size_t)stbuf.st_size;
BX_DEBUG(("tftp filesize: %lu", (unsigned long)s->tsize_val));
}
}
if ((s->options & ~TFTP_OPTION_OCTET) > 0) {
return tftp_send_optack(reply, s);
} else {
return tftp_send_data(reply, 1, s);
}
}
break;
case TFTP_WRQ:
{
if (s != NULL) {
tftp_remove_session(s);
}
strncpy((char*)reply, (const char*)data + 2, data_len - 2);
reply[data_len - 4] = 0;
s = tftp_new_session(req_tid, 1, tftp_rootdir, (const char*)reply);
if (strlen(s->filename) == 0) {
return tftp_send_error(reply, 1, "Illegal file name", s);
}
// options
if (strlen((char*)reply) < data_len - 2) {
const char *mode = (const char*)data + 2 + strlen((char*)reply) + 1;
tftp_parse_options(netdev, mode, data, data_len, s);
}
if (!(s->options & TFTP_OPTION_OCTET)) {
return tftp_send_error(reply, 4, "Unsupported transfer mode", NULL);
}
fp = fopen(s->filename, "rb");
if (fp) {
fclose(fp);
return tftp_send_error(reply, 6, "File exists", s);
}
fp = fopen(s->filename, "wb");
if (!fp) {
return tftp_send_error(reply, 2, "Access violation", s);
}
fclose(fp);
if ((s->options & ~TFTP_OPTION_OCTET) > 0) {
return tftp_send_optack(reply, s);
} else {
tftp_update_timestamp(s);
return tftp_send_ack(reply, 0);
}
}
break;
case TFTP_DATA:
if (s != NULL) {
if (s->write == 1) {
block_nr = get_net2(data + 2);
strncpy((char*)reply, (const char*)data + 4, data_len - 4);
tftp_len = data_len - 4;
reply[tftp_len] = 0;
if (tftp_len <= s->blksize_val) {
fp = fopen(s->filename, "ab");
if (!fp) {
return tftp_send_error(reply, 2, "Access violation", s);
}
if (fseek(fp, (block_nr - 1) * TFTP_BUFFER_SIZE, SEEK_SET) < 0) {
fclose(fp);
return tftp_send_error(reply, 3, "Block not seekable", s);
}
fwrite(reply, 1, tftp_len, fp);
fclose(fp);
if (tftp_len < s->blksize_val) {
tftp_remove_session(s);
} else {
tftp_update_timestamp(s);
}
return tftp_send_ack(reply, block_nr);
} else {
return tftp_send_error(reply, 4, "Illegal request", s);
}
} else {
return tftp_send_error(reply, 4, "Illegal request", s);
}
} else {
return tftp_send_error(reply, 5, "Unknown transfer ID", s);
}
break;
case TFTP_ACK:
if (s != NULL) {
if (s->write == 0) {
return tftp_send_data(reply, get_net2(data + 2) + 1, s);
} else {
return tftp_send_error(reply, 4, "Illegal request", s);
}
}
break;
case TFTP_ERROR:
if (s != NULL) {
tftp_remove_session(s);
}
break;
default:
BX_ERROR(("TFTP unknown opt %d", get_net2(data)));
}
return 0;
}
#endif /* if BX_NETWORKING */
Reference in New Issue View Git Blame Copy Permalink